ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (29,756)
  • Springer  (21,458)
  • International Union of Crystallography  (8,298)
  • 1985-1989  (25,634)
  • 1950-1954  (4,122)
  • Geosciences  (28,652)
  • Architecture, Civil Engineering, Surveying  (3,233)
Collection
  • Articles  (29,756)
Source
Keywords
Publisher
Years
Year
Journal
Topic
  • 101
    Electronic Resource
    Electronic Resource
    1,4-Benzodiazepines as ligands. Synthesis, characterization and crystal and molecular structure ofbis(8-chloro-6-(o-chlorophenyl)-1-methyl-4H-s-triazolo[4,3-a]1,4-benzodiazepine (triazolam)) cadmium (II) dichloride (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 651-660 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The compound C34H24CdN8Cl6 was prepared and characterized by means of X-ray, IR, and Raman measurements. The crystals are monoclinic, space groupC2/c, (No. 14) witha=22.284(3),b=14.501(2),c=14.595(2) Åβ=129.77(1)° andZ=4. The structure was solved by the heavy-atom method, and least-squares refinement of structural parameters led to a conventionalR factor of 0.040 for 2379 independent reflections. The structure consists of discrete molecules, in which the Cd atom is coordinated in a distorted tetrahedral geometry by two chlorine atoms and by two nitrogens of two triazolic rings of triazolam molecules. Infrared and Raman bands are assigned on the basis of the known structure. An electronic charge calculation has been performed on the unbonded ligand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179837
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 102
    Electronic Resource
    Electronic Resource
    Crystal structure of 7-cyano-6,7-dimethyl-1-phenyl-1,3,6,7-tetrahydro-2,1-benzoxaphospole 1-oxide (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 701-705 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystals (C16H18NO2P,M r=287.30) are orthorhombic, space group Pbca witha=8.200(2),b=14.857(2), andc=24.396(5)Å,V=2972.1 Å3,Z=8,D x=1.284 mg m−3,λ(MoKα)=0.71069 Å,μ=1.90 cm−1,F(000)=216,T=295K. FinalR=0.044 for 1673 observed reflections collected on a diffractometer. Structure solved by direct methods.Cis-junction and double bond in the six-membered ring cause its almost ideal sofa conformation. The two neighboring methyl groups are cis, and cyano substituent is in an equatorial position. There is a shortintramolecular H(o-phenyl)⋯O(endocyclic) contact of 2.53(3)Å and the phenyl ring is in a less favorable rotational orientation due to molecular packing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179842
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 103
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of voacangine: An alkaloid fromStemmadenia Donnell-Smithii (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 725-732 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract C22H28N2O3,M r=368.5, orthorhombic, D 2 4 -P212121. Unit cell dimensions at 293 K area=8.753(3),b=9.252(2),c=24.422(7) Å,V=1978(1) Å3,D c=1.24 g cm−3, andZ=4. The structure has been determined from single-crystal data collected with a four-circle diffractometer and refined from 1562 reflections down toR=0.050 andwR=0.055. The structural features determined from chemical and spectroscopic studies are confirmed and extended. The stereochemistry at C(4) and C(18) is 4S and 18S. The indole ring is not planar and the seven-membered nitrogen-containing ring adopts a distorted-chair conformation. The indole and seven-membered rings lie on the same plane with a dihedral angle of 0.7 (1)°, while the C(5)-N(6)-C(19)-C(2) atoms of the central axis of the iso-quinuclidine tricyclic structure is perpendicular to seven-membered ring [dihedral angle is 92.7 (1)°]. The packing in the crystal is entirely due to van der Waals forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179845
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 104
    Electronic Resource
    Electronic Resource
    Synthesis, spectroscopic studies, and crystal structure of theophyllinium tetrabromopalladate(II) (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 755-763 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The theophyllinium tetrabromopalladate(II), [Thph]2PdBr4, has been synthesized and its molecular structure has been determined by single crystal X-ray diffraction. The salt crystallizes in the monoclinic space group C2 with two formula units in a cell of dimensionsa=11.074(1),b=8.545(2),c=11.804(2) Å;β=95.22(1)°,V=1112.3(4) Å3,D c=2.353 mg m−3,D exp=2.352 mg m−3,M w=788.4, μ(MoKα)=84.5 cm−1,F(000)=752. The structure has been refined by full-matrix least-squares techniques to a final value of theR factor of 0.058 based on 907 independent intensities. The compound consists of theophyllinium cations protonated at N(9). The [PdBr4]2− anion is planar, with distances Pd-Br(1)=2.441(12) and Pd-Br(2)=2.412(6) Å, and Br(1)-Pd-Br(2) and Br(1)-Pd-Br(3) angles of 90.34(14)° and 89.66(14)°, respectively. The1H-NMR spectrum of [Thph]2PdBr4 in DMSO-d6 (300 MHz) is consistent with the observed solid-state structure, and its thermal behavior shows two steps: (i) a dehalogenation process about 327°C and (ii) a rapid pyrolitic decomposition in the 340–575°C temperature range giving PdO as final product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179848
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 105
    Electronic Resource
    Electronic Resource
    X-ray structure determination of cyclobutane photodimers from (Z)-α, β-diarylacrylonitriles (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 791-808 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Irradiation of(Z)-α, β-diarylacrylonitriles (1) ArCH=C(CN)Ar′ (a: Ar=2-thienyl, Ar′=Ph;b: Ar=p-MeC6H4, Ar′=Ph) in the solid state gives cyclobutane dimers (2) in good yield. The mass spectra of the dimers, where no fragments derived from dimers with equal groups on adjacent carbons are present, suggest a “truxillic” structure (head to tail dimerization). X-Ray determinations confirm a centrosymmetric arrangement with a D2d symmetry of the cyclobutane ring and a puckering constantϕ=24.0° for (2a) significantly higher than that of (2b) (ϕ=19.2°).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185347
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 106
    Electronic Resource
    Electronic Resource
    X-ray structure and UV spectroscopic studies of (adenmato-N9)triethylphosphinegold(I) (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 823-839 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The preparation, characterization, and X-ray structure analysis of (adeninatoN9)triethylphosphinegold(I) is reported. The crystal structure consists of discrete molecules, the adeninate anion coordinates via the N(9) atom with a Au-N(9) bond distance of 2.057(5) Å and the linear geometry about the Au atom is completed by the P atom of a disordered Et3P ligand; the Au-P(1) bond distance is 2.238(2) Å and the N(9)-Au-P(1) bond angle is 178.8(2)°. The crystals are orthorhombic, space groupPbca, with unit cell dimensionsa=8.528(1),b=17.797(3),c=18.526(2) Å andZ=8. The structure was refined by a full-matrix least-squares procedure to finalR=0.030 andR w =0.033 for 1749 reflections withI〉2.5a(I). The electronic spectrum of the complex dissolved in water in the near ultraviolet is consistent with essentially separate π-electron systems of the adenine and phosphinegold moieties; a conclusion which corroborates the X-ray structural results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185349
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 107
    Electronic Resource
    Electronic Resource
    Crystal structure and spectroscopic study of 2-(p-methoxycarbonylphenyl)-1,3,5,5,7,8,8-heptamethyl-2,4,5,6,7,8-hexahydroindeno[1,2-c]-pyrrole-7-carbonitrile (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 873-882 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of the title compound has been determined. The crystals are orthorhombic:Pbnb, (bca setting of Pccn, No 56),a=18.053(8),b=15.532(4),c=16.915(6) Å,V c =4743(3) Å3,Z=8,D x =1.17 Mg m−3,λ=(MoKα)=0.71069 Å. The structure was solved by direct methods and refined with 1352 reflections to a finalR value of 0.067. Mass and spectral data (IR, UV,1H and13C NMR) are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185353
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 108
    Electronic Resource
    Electronic Resource
    Structural investigation on hexasubstituted benzene derivatives. Part 1. The structure of ortho-dinitrotetramethylbenzene (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 905-910 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract C10H12N2O4 (M r =224.2) crystallizes in the triclinic system, space groupP¯1 witha=8.327(3),b=8.734(3),c=8.453(3) Å;a=63.6(1),β=97.0(1), γ=100.4(1)°;V=541.0(6) Å3,Z=2,D c =1.38 g cm−3,μ(Cu-Kα)=8.7 cm−1, λ=1.5418 Å, F(000)=236. Deviation from theoretic geometry of the benzene ring and from planarity is observed in accordance with theσ-electron-withdrawing character of the NO2 groups and the high steric hindrance of the substituents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185356
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 109
    Electronic Resource
    Electronic Resource
    Structure of 17β-hydroxy-4-pregnen-20-yn-3-one, C21H28O2 (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 941-947 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of 17β-hydroxy-4-pregnen-20-yn-3-one, C21H28O2, was determined by means of X-ray diffraction methods.M r=312.5, space groupP21,a=6.493(1),b=21.065(3),c=6.478(1) Å,β=105.97(1)°,V c=851.9(3) Å3,Z=2,D x=1.22 Mg m−3, CuKα radiation (λ=1.54184 Å),μ(CuKα)=5.5 cm−1,F(000)=340. The structure was solved withMultan; final conventionalR=0.032 (R w=0.032) for 1803 reflections. The molecule studied (I) has an overall conformation almost identical to 19-norethindrone (II), although ringA of molecule (I) is slightly more bent toward theα direction of the steroid skeleton in comparison with molecule (II).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160876
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 110
    Electronic Resource
    Electronic Resource
    A13C and15N NMR study of some furoxans and related compounds (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 1003-1008 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Carbon and nitrogen NMR results are reported for a collection of furoxans and related compounds, taken on DMSO solutions. The15N chemical shifts and those of neighboring13C nuclei have characteristic values for the structures studied. Relative14N signal widths are used to identify the nitro group resonances. Valence tautomerism at room temperature is reported for one compound. The INADEQUATE technique is used to determine some1J(13C-13C) data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160882
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 111
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of the rutheniumcarbene-tetraborohydrate complex [Ru(BH4)(LAr)(PPh3)2]; (LAr=CN(C6H4Me-4)CH2CH2NC6H3Me-4) (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 1017-1031 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structure of the title compound has been determined by single crystal X-ray diffraction analysis:P21/c,M r=889.9,a=15.940(1),b=23.357(2),c=18.767(2) Å,β=132.62(1)°,V c=5141.6 Å3,Z=4,D x=1.150 mg m−3,F(000)=1848; finalR f=0.074 (R w=0.085). The BH 4 − ligand in the complex is bidentate. A comparative study indicates that the lengths of the Ru-carbene carbon bond and other bonds to the Ru atom are determined by a combination of several factors, and not just by a purely σ- or π-bonding interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160884
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 112
    Electronic Resource
    Electronic Resource
    On the stereochemistry of lignin model compounds of the arylglycerol-β-aryl ether type: Crystal structure oferythro-1-(4-hydroxy-3,5-dimethoxyphenyl)-2-(4-hydroxymethyl-2,6-dimethoxyphenoxy)-1,3-propanediol, C20H26O9 (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 331-339 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of erythro-1-(4-hydroxy-3,5-dimethoxyphenyl)-2-(4-hydroxymethyl-2,6-dimethoxyphenoxy)-1,3-propanediol, C20H26O9, has been determined from single-crystal X-ray diffraction data. The compound crystallizes in the triclinic space groupP¯1 witha=8.705(6),b=8.893(5),c=13.211(8) Å,α=106.23(5),β=93.71(5), υ=82.97(5)° andZ=2. The structure was solved by direct methods. Full matrix least-squares refinement of 366 structural parameters gaveR=0.039 for 1402 observed [I〉3a(I)] reflexions. The molecules are held together by van der Waals forces and moderately strong hydrogen bonds. Average bond distances: C(sp 2)-O 1.370(6) Å and C(sp 3)-O 1.426(14) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194128
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 113
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 1,4,10-trioxa-7,13-diaza-cyclopentadecane-7,13-diacetatocopper (II) dihydrate, C114H24N2O7Cu · 2H2O (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 387-397 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract l,4,10-Trioxa-7,13-diazacyclopentadecane-7,13-diacetatocopper(II) dihydrate: space groupP43, witha=b=7.217(1),c=34.553(7) Å, andZ=4. The structure was solved by direct methods, and refined by full-matrix least-squares toR=0.039 andR w=0.043. The Cu(II) atom is seven-coordinated (deformed pentagonal bipyramidal coordination) by the two nitrogens and three oxygens of the 15-membered ring and by two oxygens from acetato groups. These groups form 5-membered chelate rings positioned on opposite sides of the macrocycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194134
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 114
    Electronic Resource
    Electronic Resource
    Crystal and molecular structures of 1-(2-iso butylylcarbamoyl propan-2-ylamino) 3-(1-naphthyloxy)propan-2-ol hydrochloride (1) (C21H31N2O3Cl) and 1-(2-isobutyloxycarbonylo propan-2-ylamino) 3-(1-naphthyloxy)propan-2-ol hydrochloride (2) (C21H30NO4Cl) (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 967-982 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper shows the crystal structures of two newβ-adrenergic antagonists, derivatives of propranolol, which were determined with three-dimensional x-ray diffraction data. The space groups and unit-cell parameters are: compound1 (C21H31N2O3Cl) monoclinic space groupP21/c,a=20.523(4),b=6.909(2),c=15.950(2) Å,β=105.03(1)°; compound2 (C21H31NO4Cl) monoclinic space groupP21/c,a=6.364(2),b=36.043(8),c=10.149(1) Å,β=104.48(2)°. The structures were solved with direct methods, and refined with full-matrix least-squares techniques toR indices of 0.059 and 0.067, respectively. The-CH(OH)-CH2-NH-sections of the side chains show the conformation approximate togauche.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160879
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 115
    Electronic Resource
    Electronic Resource
    Synthesis and UV photoelectron investigation of the “peptide units” of α,β-dehydroamino acids (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 993-1001 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The He(I) and He(II) photoelectron (PE) spectra of the N-methylamides of N-acetyldehydroalanine (1) and N-acetyldehydrophenylalanine (2) are presented and discussed, within a comprehensive investigation of the electronic structure and conformation ofα, β-dehydroamino acid derivatives. Three different procedures have been adopted for the synthesis of1. The PE results of the “peptide units” are in tune with theoretical predictions and they support the view that in the vapor phase the tendency towards a planar arrangement around the torsion angle φ is much more marked for N-acetyldehydroalanine-NHR systems than for (Z)-substituted ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160881
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 116
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of [dicarbonyl (η-cyclopentadienyl)ferrio]triphenylarsine tetrafluoroborate, [(C6H5)3As{Fe(CO)2(C5H6)}][BF4] (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 1033-1039 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160885
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 117
    Electronic Resource
    Electronic Resource
    Transport policy for London in 2001 The case for an integrated approach (1989)
    Springer
    Transportation 16 (1989), S. 257-277 
    Details
    ISSN: 1572-9435
    Keywords: coordination ; infrastructure ; road pricing ; transport policy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The paper reports the results of a series of studies conducted to enable the London Planning Advisory Committee to provide advice on strategic transport policy for London. The analytical approach combined the use of an area-based, multi-modal strategic model (LAM) and professional judgment. The performance of LAM as a basis for providing rapid advice on complex issues in transport policy is assessed. The resulting policy advice advocated a coherent approach, involving new infrastructure, particularly for rail; improved management of the road and public transport networks; the use of subsidy to enhance public transport service levels; and road user charges to reduce the impact of private vehicles on congestion and the environment. Road user charges emerged as the pivotal issue in the policy; the paper discusses their role, and the questions which still need to be resolved before they can be implemented. The main message of the study is that no one element of transport policy can tackle London's problems alone; an integrated policy in which infrastructure provision, management and pricing are used to complement one another is shown to be far more effective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165772
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 118
    Electronic Resource
    Electronic Resource
    Private tollroads in urban areas (1989)
    Springer
    Transportation 16 (1989), S. 329-341 
    Details
    ISSN: 1572-9435
    Keywords: banking ; finance ; investment ; private sector ; risk ; tollroads
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Governments of all persuasions are increasingly seeking the participation of the private sector in the supply of transport facilities and services. Private sector participation in the financing, construction, operation and maintenance of infrastructure is considered a serious option in a number of countries in the search for ways of providing much needed investment which would otherwise be deferred. This paper considers some economic and financial problems in the private sector provision of major road infrastructure within urban areas. The main issues are attaching prices (i.e. tolls) to the provision of the service, the value of government rights which are being given up either permanently or temporarily, and the identification required by the promoters of the cost of capital which is essential information in establishing the risk. Broader environmental and equity issues are not addressed. If the approach to establishing a private presence in a previously public supply context is handled properly from the outset, the benefits can be significant. Contrarily however, the prospects could be quite undesirable if badly managed, despite the presence of an extended public purse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145965
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 119
    Electronic Resource
    Electronic Resource
    Transport demand model estimation from traffic counts (1989)
    Springer
    Transportation 16 (1989), S. 3-26 
    Details
    ISSN: 1572-9435
    Keywords: demand modelling ; traffic counts ; model estimation ; gravity model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Many problems in transport planning and management tasks require an origindestination (O-D) matrix to represent the travel pattern. However, O-D matrices obtained through a large scale survey such as home or roadside interviews, tend to be costly, labour intensive and time disruptive to trip makers. Therefore, the use of low cost and easily available data is particularly attractive. The need of low-cost methods to estimate current and future O-D matrices is even more valuable in developing countries because of the rapid changes in population, economic activity and land use. Models of transport demand have been used for many years to synthesize O-D matrices in study areas. A typical example of this is the gravity model; its functional form, plus the appropriate values for the parameters involved, is employed to produce acceptable matrices representing trip making behaviour for many trip purposes and time periods. The work reported in this paper has combined the advantages of acceptable travel demand models with the low cost and availability of traffic counts. Three types of demand models have been used: gravity (GR), opportunity (OP) and gravity-opportunity (GO) models. Three estimation methods have been developed to calibrate these models from traffic counts, namely: non-linear-least-squares (NLLS), weighted-non-linear-least-squares (WNLLS) and maximumlikelihood (ML). The 1978 Ripon (urban vehicle movement) survey was used to test these methods. They were found to perform satisfactorily since each calibrated model reproduced the observed O-D matrix fairly closely. The tests were carried out using two assignment techniques, all-or-nothing and the stochastic method due to Burrell, in determining the routes taken through the network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223044
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 120
    Electronic Resource
    Electronic Resource
    Discrete mode-choice analysis of urban travel demand by the Analytic Hierarchy Process (1989)
    Springer
    Transportation 16 (1989), S. 81-96 
    Details
    ISSN: 1572-9435
    Keywords: the Analytic Hierarchy Process (AHP) ; discrete mode choice ; metropolitan corridor ; behavioral travel demand
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract This paper develops a new procedure for the problem of multimodal urban corridor travel demand estimation by using the Analytic Hierarchy Process (AHP). Certain conceptual and operational features of the AHP are common to the discrete choice theory-based modeling approach. Whereas the computational and data requirements of standard discrete choice models are immense, the proposed AHP approach deals efficiently with multidimensionality, nested demand structure and discrete travel decision making behavior. The paper concludes by summarizing the AHP-aided, step-by-step procedure for metropolitan travel demand (modal split) estimation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223047
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 121
    Electronic Resource
    Electronic Resource
    Guest editorial (1989)
    Springer
    Transportation 16 (1989), S. 195-196 
    Details
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165768
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 122
    Electronic Resource
    Electronic Resource
    Regulating traffic by controlling land use The Southern California experience (1989)
    Springer
    Transportation 16 (1989), S. 241-256 
    Details
    ISSN: 1572-9435
    Keywords: growth control ; Los Angeles ; traffic congestion ; transportation system management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract In Los Angeles emphasis in transportation planning has recently shifted from facility construction to transportation system management and the control of land use with the goal of slowing the growth in traffic congestion. This paper critically examines several recent transportation growth management strategies in Los Angeles, and concludes that though they were well intentioned, they might not lead to the intended consequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165771
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 123
    Electronic Resource
    Electronic Resource
    Dealing with congestion from a regional perspective The case of Massachusetts (1989)
    Springer
    Transportation 16 (1989), S. 197-219 
    Details
    ISSN: 1572-9435
    Keywords: transportation congestion ; demand management ; transportation planning ; land use ; growth management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Traffic congestion has received considerable public and media attention over the past several years. However, many of the transportation and land use actions offered to deal with the congestion phenomenon focus only on a specific site or at most a subregion of the metropolitan area. This paper argues that congestion in many cases is an areawide phenomenon requiring consideration from a regional and programmatic viewpoint. A ten-point congestion-relief program developed for eastern Massachusetts is described. Actions in this program included those aimed to mitigate current congestion and avoid future congestion through land use management. Four policy areas are emphasized - providing transportation system improvements, managing transportation demand, managing land use, and managing the institutional and funding framework. The paper concludes that because of the political nature of the congestion problem, the congestion-relief program's importance lies more in the message it sends to the public that programmatic action is being taken. The paper also concludes that a regional approach is necessary thus requiring close examination of existing institutions, that demand management is an important component of the strategy, that the private sector has an important role to play, and that the long-term effectiveness of the program relates to the success of attempts to “institutionalize” efforts into zoning and permit procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165769
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 124
    Electronic Resource
    Electronic Resource
    Demand for buses in Japanese medium sized cities (1989)
    Springer
    Transportation 16 (1989), S. 279-295 
    Details
    ISSN: 1572-9435
    Keywords: Bus demand ; estimation ; pooled data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The number of bus passenger has been decreasing in Japan since 1969. The increase in car ownership and development in urban rapid rail network has deprived bus service of passengers. The bus industry has suffered from depression for the last twenty years. However, many bus routes are still operated commercially. The amount of external subsidies is not large. The industry is under strict regulation. The common way for bus operators has been to increase fares rapidly in order to keep their break even condition. The first half of the paper describes present circumstances of the bus industry in more details. Then the second half of the paper treats the estimation of the effect of each factor on bus demand by using pooled data in Japanese medium sized cities. The results suggest that the increase in car ownership has had a crucial effect on local public transport demand and is likely to continue to do so.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145962
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 125
    Electronic Resource
    Electronic Resource
    Traffic safety, usability and streetscape effects of new design principles for major urban roads (1989)
    Springer
    Transportation 16 (1989), S. 297-310 
    Details
    ISSN: 1572-9435
    Keywords: compensatory measures ; speed reduction ; traffic concentration concept ; urban arterial roads
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract An important aspect of area-wide traffic calming concepts is the integration of major urban roads, because 70 to 80 percent of all urban accidents occur on major roads. Traffic calming which is primarily based on the locational shift to such main thoroughfares is socially injust, because — in spite of all disturbances on those streets — about one quarter of the urban population live there. Social justice can only be somewhat achieved if the expenditures for traffic calming and streetscaping are not used — as today is most common — for accumulating the advantages in the low traffic side streets, but aimed at a partial balance and compensation for the strains caused by car traffic on the major streets. Some compensatory measures and new design principles will be discussed. Backgrounds are the experience in six German model cities of area-wide traffic calming, several research projects and the discussion about new guidelines for major urban roads. Where traffic and environmental burdens focus, the concentration concept should be extended by compensatory measures. That is the state of discussion in Germany examplified by nine topics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145963
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 126
    Electronic Resource
    Electronic Resource
    Freight transportation demand: A survey of recent econometric studies (1989)
    Springer
    Transportation 16 (1989), S. 27-46 
    Details
    ISSN: 1572-9435
    Keywords: freight transportation demand ; survey ; econometric studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract This paper surveys econometric studies of freight transportation demand which have been published since the mid-1970s. It describes the variables, data sources, and estimation procedures utilized by the studies. In addition, it summarizes their statistical results. The studies included in this survey typically accounted for freight rates and service characteristics (e.g., transit time and reliability). Data sources often varied across the studies. Based on the data they utilized, the surveyed studies are classified as either aggregate or disaggregate. The data in the aggregate studies consist of information on total flows by modes at the regional or national level, while the data in the disaggregate studies pertain to individual shipments. The earlier aggregate studies estimated linear logit models. It has been pointed out that when they are estimated on aggregate data these models are subject to certain shortcomings. To avoid these shortcomings, more recent aggregate studies have estimated flexible forms such as translog functions. The disaggregate studies surveyed in this paper used either logit or probit models. Statistical results often varied with the commodities analyzed, making it somewhat difficult to generalize the findings of the different studies. One finding common to several studies is that freight rates have a significant impact on shipment decisions. This paper discusses certain theoretical and empirical limitations of the surveyed studies. It also offers suggestions for future research in freight transport demand. Freight demand models can be used to examine various effects of the recent deregulation in freight transportation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223045
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 127
    Electronic Resource
    Electronic Resource
    Managing transportation during highway reconstruction: A recommended process (1989)
    Springer
    Transportation 16 (1989), S. 47-79 
    Details
    ISSN: 1572-9435
    Keywords: highway reconstruction project ; transportation management plan ; management team ; programming and budgeting ; construction area traffic control ; corridor TSM ; public information and communications ; evaluation process ; traffic impact mitigating measures ; reconstruction project phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Major highway reconstruction can cause significant disruptions to existing travel patterns and economic activity. Reducing these impacts on travelers, shippers, businesses and residents requires that innovative and effective transportation management actions be developed and implemented. This paper reports the major findings and recommendations of a research study on managing transportation during highway, reconstruction. The primary objectives of the study were to investigate and document the critical interrelationships among state-of-the-art reconstruction and scheduling techniques, traffic accommodation strategies, construction quality control measures, and project planning and evaluation processes, and to formulate and recommend a corridor transportation management process that can be used to develop, implement and evaluate a transportation management plan of strategies to mitigate the corridor-wide impacts of major highway reconstruction. The recommended process consists of five chronological phases, each composed of many tasks having related focuses within the overall process. Each task is designed to contribute to the common objective of seeing that an effective transportation management plan for mitigating travel impacts throughout the project corridor is successfully realized. This process was formulated on the basis of information collected on 25 highway reconstruction projects throughout the United States by way of site visits, direct meetings with project personnel, requests for documentation, and phone interviews.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223046
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 128
    Electronic Resource
    Electronic Resource
    Guest editorial (1989)
    Springer
    Transportation 16 (1989), S. 97-98 
    Details
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163110
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 129
    Electronic Resource
    Electronic Resource
    The Dutch mobility panel: Experiences and evaluation (1989)
    Springer
    Transportation 16 (1989), S. 99-119 
    Details
    ISSN: 1572-9435
    Keywords: panels ; longitudinal mobility data ; transportation planning methods ; panel sampling framework
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The aim of this paper is to give an overview of the history and research experiences of the Dutch National Mobility Panel. Attention is given to the sampling strategy, the policy goals, and the representativity of the panel. It also tries to evaluate the research outcomes in terms of the original objectives and in view of more general research and policy goals. In sections one and two, a historic overview is given, starting from the first ideas to implement a longitudinal research instrument in transportation planning. In section three, some attention is devoted to longitudinal versus cross-sectional analyses. In section four, the sample design is treated in some detail. Next, various forms of bias are discussed that affect the representativity of the panel. In the sixth section, an overview is given of the research conducted with the data. Some conclusions are given in the final section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163111
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 130
    Electronic Resource
    Electronic Resource
    A causal analysis of car ownership and transit use (1989)
    Springer
    Transportation 16 (1989), S. 155-173 
    Details
    ISSN: 1572-9435
    Keywords: car ownership ; public transit use ; panel analysis ; causal models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The causal structure underlying household mobility is examined in this study using a sample obtained from the Dutch National Mobility Panel survey. The results indicate that car ownership is strongly associated with mode use, but that it has no influence on weekly person trip generation by household members. Characteristics of mode use are examined through a causal analysis of changes in car ownership, number of drivers, number of car trips, and number of transit trips. It is shown that observed changes in mode use cannot be adequately explained by assuming that a change in transit use influences car use. The finding suggests that the increase in car use, which is a consequence of increasing car ownership, may not be suppressed by improving public transit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163113
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 131
    Electronic Resource
    Electronic Resource
    Family changes and public transport use 1984–1987 (1989)
    Springer
    Transportation 16 (1989), S. 121-154 
    Details
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Panel data are used to investigate what happens when people have some important transitions or changes in their life-cycle, employment status, income, or car ownership. Only three years data are available, and the pace of transition is slow: as a result relevant sample sizes are rather small. The analysis is carried out in two stages: results are given from a two year period, and these are used to generate hypotheses checked with data from the third year. It is found that in many cases the effects on mobility are different from what would be expected from cross-section data. In particular: - car ownership changes are substantially less than expected; - public transport does not benefit as much as expected when people become members specific dependent or “captive” groups. These results indicate that the effects of income growth on car ownership and therefore on public transport may not be as drastic as feared. But on the other hand it may be more difficult for public transport to secure a captive base market than hoped. Both results suggest that policy and marketing strategies may be decisive. The public transport market in two weeks over two years consist of approximately equal proportions of loyal, lost, and new people. There is a slight tendency for the loyal passengers to be those who have not had major transitions in their families, but it is easier to attract new passengers from those who have had such transitions. Data from the third year gives some indication (but not conclusive proof) that in the longer run there may be some convergence to the cross section relationships. Overall, it begins to look as though dynamic or delayed effects continue to operate over a period of five years or so for public transport use, and over ten years for car ownership.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163112
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 132
    Electronic Resource
    Electronic Resource
    Measurement biases in panel data (1989)
    Springer
    Transportation 16 (1989), S. 175-194 
    Details
    ISSN: 1572-9435
    Keywords: attrition ; measurement error ; mobility ; multi-day diaries ; panel ; surveys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The objective of this paper is to examine reporting errors in panel data obtained from multi-day travel diaries. A distinction is made between within and between wave biases. The former leads to an increase in under-reporting associated with the number of days the diary is kept. The latter is related to the number of waves respondents have been participating, so-called panel experience. These biases imply that observed mobility changes between waves are partly due to reporting errors: without controlling for them, changes in mobility can not be inferred from the data. An important cause of these measurement errors is the increase in the number of days on which no trips at all were reported. In addition, shorter trips and less complex chains are more susceptible to underreporting. The methodology used in this paper provides a means of dealing with these problems. Attrition is taken into account by a rather simple measure. The paper concludes with a number of suggestions for sample and survey design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163114
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 133
    Electronic Resource
    Electronic Resource
    Suburban congestion: Recommendations for transportation and land use responses (1989)
    Springer
    Transportation 16 (1989), S. 221-240 
    Details
    ISSN: 1572-9435
    Keywords: suburban congestion ; solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Transportation congestion is reaching intolerable levels in many urban and suburban areas in the US. Reliance upon traditional responses, such as transit and new highway capacity, is not working — especially in suburban areas. Although methods for dealing with suburban congestion are often different, there are a number of common features that must be considered in developing short term as well as more permanent and long lasting solutions. In proposing short term solutions, a “Menu of Actions” is described. It includes transportation actions (the traditional transit and transportation management options) where there are opportunities for getting more out of the existing systems; land use/growth management actions which will result in more rational land use-transportation interactions; financial incentives, to encourage or discourage appropriate actions; more comprehensive and systematic land use and transportation planning; and the organizational and institutional actions required to implement rational solutions. While the “Manu of Actions” provides a broad array of possible actions to provide relief in the short run, over time the growth in traffic is likely to outpace their effectiveness. Consequently, longer term and often more difficult solutions must be considered and implemented as appropriate. They could include changes in land use development and land use management policies; changes in lifestyle and business practices; improvements through technological innovation; changes in the traditional ways of providing transportation services; and greatly expanded research and development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165770
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 134
    Electronic Resource
    Electronic Resource
    Obituary (1989)
    Springer
    Transportation 16 (1989), S. 1-2 
    Details
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223043
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 135
    Electronic Resource
    Electronic Resource
    Deregulating European aviation — A case study (1989)
    Springer
    Transportation 16 (1989), S. 311-327 
    Details
    ISSN: 1572-9435
    Keywords: aviation ; competition ; contestability ; deregulation ; economic rent ; Europe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract European international scheduled aviation has been characterised by bans on market entry, price collusion, and capacity sharing. High fares were charged compared to world standards and the fares charged by European charter airlines. In May 1986 new entrants with pricing freedom were permitted on the London-Dublin route which was then the third largest in European scheduled international aviation. Prior to deregulation the route experienced high fare growth. The unrestricted fare ex-London increased 72.6 per cent compared to a Retail Price Index increase of 41.5 per cent. There was a growth in passenger numbers in the years 1980–85 of 2.8 per cent. Since deregulation passenger numbers have risen to 2.3 million compared to 994,000 before deregulation. Fares have declined by an estimated 37 per cent ex-Dublin and 42 per cent ex-London in real terms. There have been four cases of market entry and one of market exit. The estimated share of the new entrants in the second half of 1989 was 28 per cent. The preregulation earnings data of Aer Lingus, the market leader, indicated that protection allowed staff to earn economic rents. A two-tier structure was introduced in response to competition. Remaining barriers to contestability in UK/Ireland aviation include hub airport dominance, ground handling monopolies, and the ability of airlines with routes in both regulated and deregulated markets to engage in geographical price discrimination against airlines with routes in deregulated markets only. A pro-contestability aviation policy in Europe will require measures to prevent the abuse of dominant positions by established airlines over new market entrants and to prevent collusion between established airlines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145964
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 136
    Electronic Resource
    Electronic Resource
    Transport policy in Eastern Europe a case study of Hungary (1989)
    Springer
    Transportation 16 (1989), S. 343-359 
    Details
    ISSN: 1572-9435
    Keywords: CMEA ; Centralised planning ; Eastern Europe ; Hungary ; transport policy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract This paper analyses the development of transport policy making in Eastern Europe over the last forty years and describes the role of the CMEA in determining national developments in Poland, Romania, East Germany, Czechoslovakia, Hungary and Bulgaria. The USSR, Albania and Yugoslavia are excluded. The planning system as operated in the Eastern Block, is described, followed by a particular case study of Hungarian policy making with respect to the transport sector. Specific tansport issues relating to Hungary are outlined before conclusions are drawn in terms of future developments in relation with the European Community.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145966
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 137
    Electronic Resource
    Electronic Resource
    Cobaloxime derivatives: synthesis and spectroscopic studies of alpha-furilglyoximate of cobalt (III), X-ray structure of bis(thiourea)bis(alpha-furilglyoximato)cobalt(III) nitrate (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 77-91 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract α-Furilglyoxime (H2afdo) complexes of cobalt(III) were used to synthesize H2afdo-cobaloximes with thiourea, triphenylphosphine, and aniline astrans-axial ligands. Encapsulation of the H-bonded species with BF3∶OEt2 resulted in stable BF2-capped macrocycles which mimic the central metal core of the biological molecules such as vitamin B12 etc. Solution chemistry and spectroscopic measurements of the BF2-macrocycles as well as H-bonded cobaloximes revealed six-coordinated cobalt(III) as the central atom and a short hydrogen bond in the case of latter. X-Ray structure of a representative complex [Co(Hafdo)2(thiourea)2]NO3 (Haldo=α-furilglyoxime anion) confirmed a pseudo-octahedral geometry around cobait(III) with thiourea bonded to axial positions. The oxygen atoms of furyl groups are not involved in any kind of bonding and the overall structure of the complex differs from that of the H2dmg-cobaloximes (H2dmg=dimethylglyoxime).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160845
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 138
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of diaqua-bis-(3,5-dimethyl-1-guanyl pyrazole) nickel (II) nitrate, [Ni(C6N4H10)2(H2O)2](N03)2 (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 71-76 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound crystallizes in space groupP21/n witha=10.651(3),b=11.082(2),c=8.993(3) Å,β=106.79(3)°;R=0.064 andR w=0.074 for 3399 observed reflections (I≥3σ(I)) from 3674 measured. The structure was solved by direct methods and refined by least squares. The Ni atom of the complex is located at a center of inversion, and is surrounded by four nitrogen atoms of the two ligands in square-planar geometry. The oxygen atoms of the two centrosymmetrically related water molecules complete the coordination around the metal ion to form an elongated octahedron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160844
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 139
    Electronic Resource
    Electronic Resource
    Structure of the larvicideN-(2-chlorobenzoyl)-N′-[4-(2-chloro-3,3,3-trifluoroprop-1-enyl)phenyl]urea, C17H11Cl2F3O2N2 (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 99-108 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Mw=403,2 amu,P21/c,a 18.944(8) Å,b=8.540(4) Å,c=10.794(7) Å,β=98.11(4)°,V=1729(2) Å3,Z=4,D x=1.548 g·cm−3,μ (MoKα)=4.26 cm−1; m.p. 202–204°C. FinalR=0.083 for 1632 independent observed reflections having 2θ (Mo Kά)〈50° andI〉2 σ(I). The molecule has an extended overall nonplanar conformation with onecis and twotrans-C(O)-NH- units and intramolecular hydrogen bridges. The relatively highR factor is on account of conformational disorder of the trifluoromethyl and chloro substituents of the 2-chloro-3,3,3-trifluoropropenyl moiety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160847
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 140
    Electronic Resource
    Electronic Resource
    Erratum (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 231-231 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160860
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 141
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 4-bromo-2,2,3,3-tetramethyl-1-benzyl-1-phenylphosphetanium bromide (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 267-275 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound crystallizes in the monoclinic space groupP21/n, witha=8.881(1),b=17.718(1),c=13.077(8) Å,β=99.17(2)° andZ=4. The structure was solved by the heavy-atom method and refined to a finalR value of 0.059. The four-membered ring is nonplanar, with a puckering angle of 22.0°. The Br and phenyl are in pseudoaxial positions and aretrans to each other in the solid state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194122
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 142
    Electronic Resource
    Electronic Resource
    Steroids and related studies, part 75: The crystal and molecular structure of 17a-(2-hydroxyethyl)-17a-aza-D-homo-5-androsten-3βol (HS407) (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 483-498 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of 17a-(2 hydroxyethyl)-17a-aza-D-homo-5-androsten-3βol, C22 NO2 H33 (HS407), an intermediate in the formation of azasteroidal neuromuscular blocking agents, has been determined by Vector Verification and refined by full-matrix least-squares toR=0.058 for 1805 reflections, Cu Kα radiation,θ≦65.49°. The space group is P21212,a=25.537(5),b=9.847(4),c=7.545(5) Å,Z=4. The rings in the modified steroid nucleus are alltrans connected, with A and C in distorted chair conformations, D a symmetrical chair, and B a half-chair. The hydroxyethyl side-chain in position N (17a) adopts two distinct conformations with approximately equal statistical occupancies: the first, having a coiled conformation, forms a close intramolecular contact with N(17a) in the enlarged ring D of the steroid nucleus, while the alternative side chain position, which is extended, participates in tail-to-tail intermolecular hydrogen bonding. A switch mechanism is thus formed which could influence the mode of binding of this type of drug moleculein vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185385
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 143
    Electronic Resource
    Electronic Resource
    The crystal structure of UO2Cl2(OH2)(MeCN)2·2MeCN (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 499-505 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of UO2Cl2(OH2)(MeCN)2·2MeCN has been determined at 123 K. The crystal is orthorhombic, space group Pnma, witha=14.891(8),b=6.733(6),c=15.931(9) Å, andD calc=2.18 g cm−3 forZ=4. The finalR value for 951 unique observed [F 0≥5σ(F 0)] reflections is 0.064. The U atom is seven-coordinate, pentagonal bipyramidal. The two axial positions are occupied by the uranyl oxygen atoms. Within the equatorial plane lie two acetonitrile groups, two chlorine atoms and a water molecule, the latter positioned between the two chlorine atoms. All of the atoms except the uranyl oxygen atoms lie in crystallographic mirror planes. The water molecule is hydrogen bonded to the two uncoordinated solvent molecules. Several close contacts between the solvent methyl groups and chlorine atoms suggest weak C-H acidic interactions of the type C-H⋯Cl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185386
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 144
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 6-chloro-3-cyclopentylmethyl-3,4-dihydro-7-sulfamyl-2H-1,2,4-benzothiadiazine-1,1-dioxide (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 547-560 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of the title compound, C13H18N3O4S2C1, a sulfa drug, has been determined by X-ray diffraction data using MoKα radiation. The crystals are orthorhombic,Pbca, witha=9.441(4),b=29.633(11),c=12.167(8) Å andZ=8. The structure was solved by the heavy-atom method, and refined by full matrix least-squares to a finalR value of 0.054 with 2062 observed reflections. In the crystal, the molecules are linked by N-H⋯O hydrogen bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185390
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 145
    Electronic Resource
    Electronic Resource
    Synthesis, structural, and spectroscopic study of rhenium(III) and rhenium(V) 4,6-dimethylpyrimidine-2-thiolate/triphenylphosphine mixed complexes: Crystal and molecular structure of ∥ReCl2(pymS)(PPh3)2∥·C3H6O and ∥ReOCl2(pymS)(PPh3)∥ (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 513-534 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 4,6-dimethylpyrimidine-2(1H)-thione reacts with rhenium(V) precursorstrans-∥ReOX3(PPh3)2∥ (X=Cl, Br) in acetone, to afford two classes of crystalline pyrimidinethiolate/triphenylphosphine mixed complexes:trans-∥ReIIIX2(C6H7N2S)(PPh3)2∥·C3H6O and ∥RevOX2(C6H7N2S)(PPh3)∥ (X=Cl, Br). The crystal structures oftrans-∥ReCl2(C6H7N2S)(PPh3)2∥·C3H6O (I) and ∥ReOCl2(C6H7N2S)(PPh3)∥ (II) have been determined from single-crystal diffractometer data and refined toR factors of 0.0496 and 0.0365, respectively. (I) crystallizes in the triclinic space group P¯1 witha=16.875(4),b=13.969(7),c=9.510(2) Å;α=81.78(2)°,β=85.15(12)°, γ=107.97(8)° andZ=2. The coordination geometry around the rhenium center exhibit mutuallytrans phosphine groups and chloride ligands disposedtrans to the nitrogen and sulfur donors of the pyrimidinethiolate ligand which form a four-membered chelate ring with the metal. (II) crystallizes in the monoclinic space group P21/c witha=12.554(3),b=10.501(1),c=19.200(5) Å;β=106.54(2)° andZ=4. The rhenium atom presents a very distorted octahedral configuration with a chlorine atomtrans to phosphine ligand in the axial position and the N,S-chelate ligand in the equatorial plane with the sulfur donor atomtrans the Re=Ooxo group. The compounds were characterized also by means of ir and nmr spectroscopic measurements; reaction pathways are discussed on the basis of structural data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185388
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 146
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of lapachenole (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 597-602 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185395
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 147
    Electronic Resource
    Electronic Resource
    Structure of 9α, 11β-dichloro-4-pregnene-3,20-dione, C21H28O2Cl2 (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 569-576 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of 9α, 11β-dichloro-4-pregnene-3,20-dione, C21H28O2C12, has been determined:M r =383.4,P31,a=7.358(2),c=30.137(20) Å,V c =1413(2)Å3,Z=3,D x =1.35 g cm−3, λ(MoKα)=0.71073Å,μ=3.6 cm−1,F(000)=612,T≈80K,R=0.060,R w =0.052 for 2376 unique observed reflections. The steroid skeleton exhibits a flattening of theA ring relative to the rest of the molecule caused by halogen substituents. The title compound has a very high relative binding affinity for the rabbit uterine progesterone receptor. The high binding affinity may result from the flattening of theA ring relative to the rest of the steroid skeleton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185392
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 148
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of four compounds resulting from nucleophilic addition of 2H-pyrroles to dimethyl acetylene-dicarboxylate, methyl propiolate and phenyl isocyanate (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 603-621 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185396
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 149
    Electronic Resource
    Electronic Resource
    X-ray structural investigation of two optically active 1N-epimers of 2,5,7,10,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-dienenickel(II) diperchlorate. A novel conformation of the macrocyclic ligand (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 51-70 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structures oftrans-1NH,8NH- (I) andcis-1NH,8NH-(II)-2,5,7,10,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-dienenickel(II) diperchlorates have been investigated by X-ray diffractometric methods. CompoundI crystallizes in a monoclinic system, space groupP21,Z=4,a=11.225(1),b=13.710(1),c=15.898(2) Å,β=109.22(1)°. CompoundII crystallizes in an orthorhombic system, space groupP212121,Z=4,a=15.529(2),b=14.129(2),c=10.621(1) Å. The structures were solved by the heavy-atom method followed by a series of Fourier syntheses, and refined by full-matrix least squares to give forI andII R=0.051 (for 3787 independent reflections) andR=0.048 (for 1494 reflections), respectively. Conformational analysis of chelate rings and of the macrocyclic ring was performed forI andII, and the results were compared with those of some known 1,4,8,11-tetraazacyclotetradeca-4,11-dienenickel (II) complexes. A novel conformation of the macrocycle was found in cationI. Conformations of the methyl groups are forI andII 2(a),7(e),10(a),14(e) and 2(a),7(e),10(a),14(a), respectively, with a 1,3-syn-axial interaction of the 2,14-methyl groups inII. The absolute configuration of cationI is 1N(S), 2(R), 7(R), 8N(S), 10(R), 14(S), and differs from that of cationII by 1N(R) exclusively (1N-epimeric compounds).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160843
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 150
    Electronic Resource
    Electronic Resource
    Studies of systemic acylanilide fungicides: Part V. Crystal structure and molecular conformation ofDL-methylN-(2,6-dimethylphenyl)-N-(2-phenylacetyl) alaninate (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 109-121 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of the title compound (C20H23NO3) was determined by three-dimensionalx-ray analysis from diffractometer data. Crystal data are: monoclinic,C2/c,a=22.425(18) Å,b=11.201(5) Å,c=15.388(16) Å,β=108.95(7)°,Z=8,D x=1.182 g·cm−3,μ (MoKα)=0.075 mm−1. FinalR=0.083 for 1148 observed reflexions. The 2,6-dimethylphenyl ring is almost perpendicular to the amidic plane of the molecule (dihedral angle of 92.5°) whereas the phenyl group of the phenylacetyl moiety is inclined at 65.4° with respect to the plane through the central part of the molecule. The distance between the two carbonyl oxygens is 3.095 Å, i.e., within the hitherto observed range of 3.028–3.100 Å for related systemic acylanilide fungicides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160848
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 151
    Electronic Resource
    Electronic Resource
    Nitrogen NMR studies on some fused ring N-heterocycles (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 159-166 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract 15N and14N NMR data are reported for a number of fused ring N-heterocycles.14N line widths,15N-1H couplings and nitrogen shielding additivity rales are used for15N signal assignments. The results obtained lead to some progress in the generalization of the effects of nitrogen-nitrogen interactions on nitrogen shieldings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160852
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 152
    Electronic Resource
    Electronic Resource
    The N,N-diacetylaminobenzene group in the structure of 6-methyl-8-N,N-diacetylamino-2,4-bis(trichloromethyl)-1,3-benzdioxin (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 175-182 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Crystals of 6-methyl-8-N,N-diacetylamino-2,4-bis(trichloromethyl)-1,3-benzdioxin are triclinic, P¯1,Z=2,a=9.586(3),b=9.914(2),c=12.308(5) Å,α=67.19(3),β=71.95(3), γ=74.14(2)°. The structure was solved by direct methods, from data collected at room temperature on an Enraf-Nonius CAD4 difFractometer, and refined by least squares to a finalR value of 0.039 using 3038 reflections. The heterocyclic ring has an envelope conformation. Of thecis-CCl3 groups one CC13 group is pseudoequatorial while the −(CAr·C)CCl3 group is pseudoaxial. (CAr)O-C 1.405(4); (CAr·O)C-O 1.387(4) Å; CAr-C(Cax)-0 112.3(3); C(Cax)-O-C(Ceq) 116.1(2)°; (CAr)O-C-O-C(CAr)58.2(3)°. The configuration of the diacetylamino group (DAA) issyn-anti. The π-systems of the DAA and of the aromatic ring are approximately orthogonal, the deviations from orthogonality probably being caused by an intermolecular bifurcated hydrogen bond, each such interaction involving two molecules only, between thesyn O(=C) of the DAA and both hydrogen atoms bonded to the heterocyclic ring in a molecule of the enantiomer. The geometry of the DAA-benzene fragment is compared with those found in the other three published X-ray structures containing this group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160854
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 153
    Electronic Resource
    Electronic Resource
    Disorder arising from the location of enantiomers in a twist-boat structure: 2,6-trans-2,4,6-tris(trichloromethyl)-1-oxa-3,5-dithian (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 183-191 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Crystals of the title compound are orthorhombic, Pca21;a=27.586(4),b=10.509(3),c=11.080(2) Å,V=3212(1) Å3,Z=8. The structure was solved by direct methods, from data collected at room temperature on an Enraf-Nonius CAD4 diffractometer, and refined by full-matrix least squares to a finalR value of 0.055 using 2043 reflections. One of the two independent molecules in the asymmetric unit is disordered. The disorder is manifested mainly between the oxygen atom and one sulfur atom and is caused by opposite enantiomers occupying corresponding positions in different unit cells. The endocyclic torsion angles in both independent molecules are very similar but the disposition of the heteroatoms on the twist-boat framework is different in the two molecules. Site occupancy of the two models on this framework in the disordered molecule is in the ratio 21∶79 with the smaller proportion being very similar to the ordered molecule and the remainder similar to that found in the ‘normal’ molecule oftrans-4-chloro-2,4,6-tris(trichloromethyl)-1-oxa-3,5-dithian (Irving and Irving, 1988).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160855
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 154
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of S-(+)-ethyl-O-(4-phenylbenzoyl)lactate, C18H18O4 (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 215-222 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160858
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 155
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 4,17a-methy1-4, 17a-diaza-5α-androstane (HS353): An intermediate in the design of azasteroid neuromuscular blocking agents (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 237-256 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of 4, 17a-methyl-4, 17a-diaza-5α-androstane (HS353), C20N2H36 has been determined by direct methods and successive electron density calculations. The crystals are triclinic,a=7.419(2),b=20.300(4),c=12.866(2)Å,α=105.91(2),β=76.33(2),γ=99.32(2)°, space groupP1,Z=4. Block-matrix least-squares refinement converged toR=0.0660 for 3243 reflections withI≧3σI (CuKα radiation). The four independent molecules show only minor conformational variations, all rings being trans-connected chairs. Introduction of N at positions 4 and 17a of ringsA andD creates asymmetry in both conformation and bond angles, producing outward bending of the C-N side groups at both ends of all four molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194120
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 156
    Electronic Resource
    Electronic Resource
    (−)-S-Benzyl-α-hydroxymethylcysteine: Confirmation of its (S)-configuration by x-ray analysis of itsN-benzoyl derivative (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 257-265 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract LaevorotatoryN-benzoyl-S-benzyl-α-hydroxymethylcysteine (1) crystallizes in space groupP21 with cell parameters:a=8.972(1),b=10.004(1),c=10.302(1)Å,β=106.4(1)°,V c=887.2(5)Å3,Z=2. The structure was solved by direct methods and refined toR w=0.054 with 1324 independent reflections. The absolute configuration of1 was determined asS by the application of Hamilton test and by the estimation of the Bijvoet coefficientB. Theα-amino acid residue adopts the C5 ring conformation similar to the fully extended form. The two side chains also adopt an extended conformation around the C α atom. X-Ray analysis of1 confirms theS configuration assigned previously for laevorotatoryS-benzyl-α-hydroxymethylcysteine (2) by chemical correlation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194121
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 157
    Electronic Resource
    Electronic Resource
    Structural investigation on hexasubstituted benzene derivatives. Part 2: The structure of metadinitrotetramethylbenzene and molecular mechanics analysis on meta and ortho derivatives (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 341-348 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract C10H12N2O4 (M r=224.2) crystallizes in the monoclinic system, space groupP21/mwitha=15.462(4),b=7.926(3),c=8.972(3) Å;β=90.2(1)°;V=1099.5(6) Å3;Z=4;D c=1.35 gcm−3;μ(Cu-Kα)=8.6 cm−1; λ=1.5418 Å;F(000)=472. The position of the molecule on a crystallographic mirror plane forces the NO2 plane to be normal to the benzene ring. Theσ-electron-withdrawing character of the NO2 groups induces a deformation on the geometry of the benzene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194129
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 158
    Electronic Resource
    Electronic Resource
    Crystal structures of 4-amino-1,2,4-triazolidine-3,5-dione (urazine) (C2H4N4O2) and dichlorobis (4-amino-1,2,4-triazolidine-3,5-dione-N, O) copper (II) (C4H8Cl2CuN8O4) (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 357-367 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Crystal structure analyses of urazine and of its adduct with CuCl2 show that this ligand can exchange interactions of stacking that cannot be defined as simple π-π interactions. The copper atoms are octahedrally coordinated by two oxygen atoms and two aminic nitrogen from chelating uraxines and two chlorine atoms. The crystals of urazine are monoclinicP21 c:a=6.741(1),b=5.815(1),c=11.141(2) Å,/gb=92.13(1)°,V c=436.4(1) Å3,Z=4,R=0.0402 for 714 independent observed reflections; the crystals of [CuCl2(urazine)2] are triclinicP¯1:a=5.236(1),b=6.662(1),c=8.411(1) Å,α=93.00(1),β=104.87(1), υ=105.69(1)°,V c=270.66(8) Å3,Z=1,R=0.0380 for 875 independent observed reflections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194131
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 159
    Electronic Resource
    Electronic Resource
    The crystal and molecular structure of 14-β-N-pentylaminomorphinone, C22H28N2O3 (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 415-431 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of 14-β-N-pentylaminomorphinone (14-β-N-PAM), C22H28N2O3, has been determined by analysis of single crystal X-ray diffraction data. The compound crystallized at room temperature in the orthorhombic system, space group P212121 witha=12.4535(8),b=13.7855(8),c=11.710(1) Å,V c =2010.3(2) Å3,Z=4,D x =1.22 gm/cm3,μ(Cu Kα)=6.58 cm−1, andF(000)=792. The final refinement yieldedR=0.051,R w =0.059 for 328 variables with 1133 unique observed reflections. The absolute configuration is established via the synthesis from thebaine by the noninvolvement of certain asymmetric centers. The molecule is found to have as its central structure a T shape similar to that found in morphine and codeine. The distinctive feature of the molecule is the 14-β-N-pentylamino lipophilic side chain. Molecular modeling studies on the alkylamino chain result in the identification of clusters of conformations based on energy and dihedral angle criteria. Selected conformations are compared to 19-propylthevinol (etorphine), another potent analgesic which contains a lipophilic hydroxyalkyl substituent at C19. The enhanced analgesic activity of 14-β-N-pentylaminomorphinone is postulated to arise from an overall morphine-like contact with the receptor augmented by the interaction of the aliphatic chain with a lipophilic receptor pocket.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185379
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 160
    Electronic Resource
    Electronic Resource
    Relating infra red spectral data to structure for a series of M2(CO)10−n(L)n complexes (M=Re, Mn; L=CNR, PR3; R=Alkyl, Aryl; n=1−4) (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 451-464 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An analysis of the IR spectral patterns of a series ofM 2(CO)10−n (L) n complexes (whereM=Re, Mn; L=CNR, PR 3;R=Alkyl, Aryl;n=1−3), taking as far as possible example structures that have been determined by X-ray crystallography, has enabled a correlation to be established between the number and intensity ofv(CO) IR bands and the substitution geometry of the complex. Such a set of standard IR spectral patterns can be used as an easy means of verifying the substitution geometry of such complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185382
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 161
    Electronic Resource
    Electronic Resource
    Crystal structure of DMAP-C-HMTCAQ, C30H20N6O2, N,N-dimethylaminophenyl-carbamate-2′-hydroxymethyl-11,11,12,12-tetracyano-anthraquinodimethan (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 475-482 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract C30H20N6O2,M r =496.53, triclinic, P¯1,a=8.748(4) Å,b=10.989(3) Å,c=13.541(8) Å,α=90.67(4)°,β=99.15(4)°, γ=98.62(4)°,V=1269.8 Å3,Z=2,D c =1.30 g cm−3, λ (Mo Kα)=0.71069 Å,μ=1.02 cm−1,F(000)=516.0,T=295(3) K,R=0.127% for 1839 observed reflections, 363 parameters. The molecule has an extended, rather than a folded geometry. The HMTCAQ moiety has mm symmetry, and is shaped like a hawk about to land. The anthraquinone ring system is folded, with a dihedral angle of 37.3°; the two propanedinitrile groups have a mutual dihedral angle of 80.2°. The dihedral angle between the central ring of the TCAQ moiety and the phenyl ring is 37.2°. The phenyl rings stack over each other with a perpendicular distance of 3.36 Å. The dipole moment of the molecule is 6.254 Debyes; the crystal Madelung energy isE M=−8.989 kJ/mol; the dispersion energy isE d =−318.370 kJ/mol; the repulsion energy isE r =130.139 kJ/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185384
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 162
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 5-carbamyl-5H-dibenzo[b,f] azepine (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 641-649 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structure of the title compound has been determined by direct methods from diffractometer data, and refined by full-matrix least squares. Crystals are monoclinicP21/n,a=7.534(1),b=11.150(2),c=13.917(3) Å,β=92.94(4)°,Z=4,D x=1.34 (3) g cm−3,R=0.084 for 1259 observed reflections. The azepine ring has a boat conformation. The fused benzene rings are planar. Molecules are packed as hydrogen-bonded dimers through the carboxamide groups. The atomic charge distribution over the fused ring system is approximately symmetrical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179836
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 163
    Electronic Resource
    Electronic Resource
    A comparative UV vapor-phase photoelectron study of substituted styrenes and phenylacetylenes (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 683-694 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The possibility of correlating UV photoelectron (PE) data, in particular the lowest IEs, with basicity or nucleophilicity in the vapor-phase and in solution was investigated by studying two sets of equally substituted styrenes and phenylacetylenes. The He(I) and He(II) excited vapor-phase PE spectra were recorded and assigned by symmetry arguments and by comparison with previously investigated molecules and analysis of the relative band intensities under different radiation sources. The assignments were supported by semiempirical quantum mechanical calculations. The lowest IEs in both series of compounds vary according to the well-known substituent effects and a significant correlation with the gas-phase basicity (GB) has been found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179840
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 164
    Electronic Resource
    Electronic Resource
    Crystal structure of bis(benzimidazolium) tetrabromocuprate(II) (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 707-713 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Stable, dark-violet crystals of (C7H7N2)2CuBr4 were obtained from an aqueous solution of CuBr2, HBr, and benzimidazole. The crystal structure was determined by three-dimensional X-ray analysis. The crystals are monoclinic:C2/c, a=15.651(4),b=7.945(1),c=15.775(4) Å,β=91.44(2)°,Z=4,V c=1960.96 Å3,D x=2.105 g cm−3. The structure was refined by full-matrix least squares to giveR=0.042 andR w=0.048 for 1254 intensities above 3σ(I). The copper(II) ions are four-coordinated in the form of a distorted tetrahedron CuBr4 ofC 2 symmetry. Two different Cu-Br bond lengths are observed: Cu-Br(1)=2.426(2), Cu-Br(2)=2.330(2) Å. Only one flattened angle [Br(2)-Cu-Br(2′)=132.71(9)°] in the CuBr4 tetrahedron is noted. The angles Br(1)-Cu-Br(1′)=108.83(7), Br(2)-Cu-Br(1′)=99.92(5) and Br(2)-Cu-Br(1)=107.13(5)° have been found. Hydrogen bonds explain the deformation of the CuBr 4 2− coordination polyhedron. The structure is compared with other CuX 4 2− complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179843
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 165
    Electronic Resource
    Electronic Resource
    Crystal structures of dimethylsuccinate and dimethyloxalate: Carbonyl group orientation for C13 chemical shielding tensor studies (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 715-723 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structures of dimethylsuccinate (DMS) and dimethyloxalate (DMO) have been determined to facilitate the determination of the C-13 chemical shielding tensors of the carbonyl carbon in esters. Crystals of DMS are monoclinic, space groupC2/c,Z=4,a=13.154(4),b=6.156(1),c=9.363(4)Å,β=98.53(3)°. The structure was solved by direct methods and refined by leastsquares procedures to giveR=0.071 for 932 observed data. Crystals of DMO are monoclinic space group,P21/n,Z=2, witha=3.891(1),b=11.879(2),c=6.213(2) Å,β=103.32(2)°. The structure is the same (within experimental error) as that reported by Dougill and Jeffrey (1953) and refined to giveR=0.074 for 395 observed data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01179844
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 166
    Electronic Resource
    Electronic Resource
    Molecular conformations of γ-lactone rings from crystal structure data (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 3-23 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The various conformations of γ-lactone rings, derived from crystal structures, are described and parametrized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160840
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 167
    Electronic Resource
    Electronic Resource
    Structure of 17β-hydroxy-1,4-androstadien-3-one monohydrate C19H26O2·H2O (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 933-939 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structure of the title compound, C19H26O2·H2O, was determined by X-rays.M r=304.4, space groupP21,a=10.3113(6),b=10.3978(21),c=7.8710(9) Å, γ=89.527(9)°,V c=844(1) Å3,Z=2,D x=1.194 Mg m−3. CuKα radiation $$\left( {\bar \lambda = 1.54184{\AA}} \right)$$ ,μ(CuKα)=5.9 cm−,F(000)=332. FinalR factor=0.046 (R w=0.047) for 1002 unique reflections. The structure was solved usingMultan. The water molecule is the hydrogen donor to O(3) and a hydrogen acceptor from the O(17) hydroxyl group. RingA is rather flat relative to the rest of the steroid backbone and the O(3)-plane distance is 1.99 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160875
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 168
    Electronic Resource
    Electronic Resource
    Di-μ-sulphido-bis[4-methyl-piperidinedithiocarbamate tin(IV)]: Synthesis, characterization, and crystal and molecular structure (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 957-966 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound, C15H26SnN2S5Cl2, was prepared, and characterized by means of X-ray and IR measurements. The crystals are monoclinic, space groupP21/n, (non standard setting ofP21/c, No. 14) witha=12.330(2),b=11.930(1),c=17.055(2) Å,β=106.21(1)° andZ=4. The structure was solved by the heavy-atom method, and least-squares refinement of the structural parameters led to a conventionalR factor of 0.028 for 1284 independent reflections. The structure consists of discrete dimeric units with the metal coordinated to six sulphur atoms. The IR spectrum is consistent with the presence of the sulphur bridge atoms between the two metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160878
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 169
    Electronic Resource
    Electronic Resource
    Structure of progesterone hydroquinone monohydrate (1∶1∶1), C21H30O2·C6H6O2·H2O (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 983-991 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of progesterone hydroquinone monohydrate was determined by means of X-ray diffraction methods:M r=442.6, orthorhombic,P212121,a=14.680(2),b=22.725(3),c=7.334(1) Å,V a=2446.6(6) Å3,Z=4,D x=1.190 M gm−3, MoKα radiation $$\left( {\bar \lambda = 0.7107{\AA}} \right)$$ ,μ(MoKα)=0.75 cm−1,F(000)=948. The structure was solved usingMultan;R=0.059,R w=0.059 for 2736 reflections. This progesterone molecule has the most flattenedA ring, relative to the rest of the skeleton, of all progesterone molecules studied so far. Steroid, hydroquinone, and water molecules form, by means of hydrogen bonds, two parallel chains connected with each other by hydrogen bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160880
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 170
    Electronic Resource
    Electronic Resource
    Announcement (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. I 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160886
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 171
    Electronic Resource
    Electronic Resource
    X-ray crystallographic determination of the structure and conformation of 7-(1-acetoxy-1-methylethyl)-4a-methyl-octahydro-2(3H)-naphthalenone (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 167-173 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of 7-(1-acetoxy-1-methylethyl)-4a-methyl-octahydro-2(3H)-naphthalenone, C16H24O3 has been determined by X-ray diffraction. The crystals are orthorhombic, P212121,a=5.938(2),b=12.081(4),c=21.607(7) Å,Z=4. The structure was solved by direct methods, and refined to an R value of 0.062 for 1013 nonzero independent amplitudes. Ring A has the C(6)β distorted sofa conformation whereas the B ring possesses the slightly deformed chair conformation. The side chain in the C(10) position isα oriented in relation to the plane of the B ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160853
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 172
    Electronic Resource
    Electronic Resource
    Crystal structure of copper(II)mellitate, [Cu3.5C6(COO)5(COOH)(OH)2(H2O)8.5]·4.5H2O (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 203-213 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of copper(II)mellitate, Cu3.5C12H29O27, has been determined by X-ray analysis. The complex crystallizes in the orthorhombic space groupIba2, with unit-cell dimensionsa=19.274(3),b=21.054(7),c=12.956(4) Å. The structure was deduced by the direct method with the help of the Patterson method and refined by the block-diagonal least-squares technique to a finalR value of 0.037 for 2995 observed reflections. Among six carboxyl groups of mellitic acid, five groups lose protons and form coordinate bonds to four copper atoms, and the remaining group forms hydrogen bonds to the water of crystallization and coordinated water. The configuration around copper is distorted-pyramidal, with the Cu-O bond distances of 1.896(7) to 2.425(7) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160857
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 173
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of (4R*,5S*)-5-(3,5-dinitrophenylcarbonyloxy)-4-methoxy-4-methyl-2-cyclopenten-1-one, C14H12O8N2 (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 223-230 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160859
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 174
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 3,3-diphenyl-3-phosphoniabicyclo[3.2.1]oct-6-ene bromide monohydrate (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 317-329 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound crystallizes in the monoclinic space groupP21/n,a=13.429(3),b=18.248(6),c=14.497(4)Å,β=90.61(2)°,Z=8, with two independent molecules in the asymmetric unit. The structure was solved by heavy-atom methods, and refined to a finalR value of 0.040. The phosphoranium ring adopts a chair conformation which is substantially flattened at the phosphorus end. The ring conformation and torsion angles are compared with similar compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194127
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 175
    Electronic Resource
    Electronic Resource
    Structure and IR spectroscopic behavior of 2,4-dimethylpyridinium pentachlorophenolate (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 349-356 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structure of 2,4-dimethylpyridinium pentachlorophenolate (DMP PCP) has been determined by X-ray diffraction. The crystals are monoclinic, space groupP21,/n, witha=8.729(7),b=13.72(1),c=12.82(1) Å,β=91.39(8)° andZ=4. The structure was solved by the direct methods, and refined toR=0.040 for 2375 non-zero independent reflections. The N+-H⋯O− hydrogen bond is of length 2.604(3) Å. The ionic character of the hydrogen bond has been confirmed by the IR spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194130
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 176
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of chloramphenicol analog: 2-amino-4-methoxy-2′,2′-dichloroacetophenone (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 379-385 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of the title compound has been determined from diffractometric data usingMo Kα radiation. The crystals are orthorhombic, space groupP212121, witha=12.052(3),b=11.901(2),c=6.976(1) Å andZ=4. The structure was solved by the heavy-atom method and refined by full-matrix least-squares to a finalR value of 0.039 with 1096 “observed” reflections. The molecule is is almost planar. The acetyl group and the phenyl ring are strongly conjugated, the corresponding dihedral angle being 3.3(2)°. The structure is stabilized by an intramolecular N(1)-H(N)1⋯O(l) hydrogen bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194133
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 177
    Electronic Resource
    Electronic Resource
    Molecular structure and electronic populations of two ligands for the benzodiazepine receptor sites: 3-methyl-6-phenyl- and 3-methyl-7-phenyl-1,2,4-triazolo[4,3-b]pyridazines, SR95199 and SR95195; x-ray diffraction analysis andab initio MO calculations (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 399-410 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract (I) 3-methyl-6-phenyl-1, 2, 4-triazolo[4,3-b]pyridazine, SR95199, C12H10N4,M r=210.2, monoclinic,P21/n,D x=1.36 g cm−3, $$\bar \alpha$$ , =1.54178 Å,F(000)=440,T=293 K, finalR=0.049, (II) 3-methyl-7-phenyl-1, 2, 4-triazolo[4,3-b]pyridazine, SR95195, C12H10N4,M r=210.2, monoclinic,P21/n,D x=1.37 g cm−3, Cu $$\bar \alpha$$ , =1.54178Å,F(000)=440,T=293 K, finalR=0.039. The electronic characteristics of the triazolopyridazinic system, as determined by STO-3G molecular orbital (MO) calculations, do not vary as function of the position of the phenyl substituent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01194135
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 178
    Electronic Resource
    Electronic Resource
    Alkylation of tellurium tetrachloride by trimethylaluminum. Synthesis and molecular structure of [Te(CH3)3][Al(CH3)2Cl2]: A novel organotelluronium-aluminum oligomer (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 433-438 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Reaction of TeCl4 with A1(CH3)3 in toluene affords the crystalline product [Te(CH3)3][Al(CH3)2Cl2]. The title compound crystallized in the monoclinic space group P21/n with unit cell parametersa=11.630(3),b=12.595(4),c=8.409(2) Å,β=89.97(2)°, andD c =1.62 g cm−3 forZ=4. Least-squares refinement based on 1354 observed reflectionsI≥3σ (I) in the range 3.5〈2Θ〈45.0° led to a finalR factor of 0.046 (R w =0.067). The compound does not exist as discrete cations and anions but may be described as an organotelluronium-aluminum oligomer. The mean Te-C bond distance is 2.130(11) Å while the mean Al-Cl bond distance is 2.221(4) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185380
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 179
    Electronic Resource
    Electronic Resource
    Structures of NN′-ethylenebis(monothioacetylacetoneiminato)nitrosylcobalt and NN′-ethylenebis(2-hydroxyacetophenoneiminato)nitrosylcobalt (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 439-450 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The cobalt atoms in both [Co(NO)(sacacen)] and [Co(NO)(7-Mesalen)] {sacacenH2 isNN′-ethylenebis(monothioacetylacetoneimine) and 7-MesalenH2 isNN′-ethylenebis(2-hydroxyacetophenoneimine)} are 5-coordinate, with a tetragonal-pyramidal arrangement of donor atoms. The cobalt atom in [Co(NO)(sacacen)] lies just above the plane defined by the SNNS donor atoms of the quadridentate ligand, and the nitrosyl group occupies the apical position. A similar geometry is defined by the ONNO donor atoms and the NO group in [Co(NO)(7-Mesalen)]. The Co-N-O angles are strongly bent, as predicted from15N-nmr studies (127.2(6)°[Co(NO)(sacacen)] and 127.4(3)°[Co(NO)(7-Mesalen)]). Both nitrosyls crystallize in the monoclinic system. For [Co(NO)(sacacen)],a=8.501,b=12.673,c=13.866 Å,β=95.00°,Z=4 and space groupP21/c. The structure was determined by the heavy-atom method, usingMo Kα diffractometer data, and refined by full matrix least squares toR=0.062 for 2920 observed reflections. For [Co(NO)(7-Mesalen)],a=9.461,b=13.053,c=13.456,β=99.32°,Z=4 and space groupP21/c. The structure was determined as above toR=0.040 for 2461 observed reflections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185381
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 180
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of bis(o-phenylenethiourea)selenium(II)chloride dihydrate, C14H12N4S2Cl2Se·2H2O (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 465-473 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The synthesis and crystal structure ofbis(o-phenylenethiourea)selenium(II)-chloride dihydrate, Se(C7H6N2S)2Cl2·2H2O are reported. The compound crystallizes in the monoclinic space group, P21/n, with four molecules per unit cell, the dimensions of which area=10.243(3),b=13.341(4),c=14.273(4) Å,β=93.00(3)°,U=1947.76 Å3. The structure was solved by direct methods and refined by full-matrix least-squares toR=0.039 andR w =0.040 for 3314 unique reflections. Selenium displays two strong coordinations arising from the two sulfurs, Se-S(1)=2.191(1), Se-S(2)=2.206(1) Å, and S(1)-Se-S(2)=101.0(1)°, and four secondary interactions involving three chlorines and one sulfur. The complex occurs as a dimer with two sets of very weakly interacting bridging pairs S(2), S(2)a; and Cl(2), Cl(2)a, where “a” denotes the inversion related atom. Lattice stabilization is ensured by the extensive network of hydrogen bonds involving chlorines, water oxygens, and nitrogens of phenylenethiourea ligands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185383
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 181
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of phenylbenzyl-1-(2,2,3-trimethylcyclopropyl)phosphine oxide (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 1009-1016 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The title compound crystallizes in the orthorhombic space groupPna21, witha=15.576(2),b=19.134(3),c=5.693(1) Å andz=4. The structure was solved by direct methods, and refined to a finalR value of 0.059. This study confirms both the structure and stereochemistry of the title compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160883
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 182
    Electronic Resource
    Electronic Resource
    Book review (1989)
    Springer
    Rock mechanics and rock engineering 22 (1989), S. 65-66 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01274120
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 183
    Electronic Resource
    Electronic Resource
    Measurement of rock mass deformation with grouted coaxial antenna cables (1989)
    Springer
    Rock mechanics and rock engineering 22 (1989), S. 1-23 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Summary Techniques presented herein show how reflected voltage pulses from coaxial antenna cable grouted in rock masses can be employed to quantify the type and magnitude of rock mass deformation. This measurement is similar to that obtained from a combined full profile extensometer (to measure local extension) and inclinometer (to measure local shearing). Rock mass movements deform the grouted cable, which locally changes cable capacitance and thereby the reflected wave form of the voltage pulse. Thus, by monitoring changes in these reflection signatures, it is possible to monitor rock mass deformation. This paper presents laboratory measurements necessary to quantitatively interpret the reflected voltage signatures. Cables were sheared and extended to correlate measured cable deformation with reflected voltage signals. Laboratory testing included development of grout mixtures with optimum properties for field installation and performance of a TDR (Time Domain Reflectometry) monitoring system. Finally, the interpretive techniques developed through laboratory measurements were applied to previously collected field data to extract hitherto unrealized information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01274117
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 184
    Electronic Resource
    Electronic Resource
    Announcements (1989)
    Springer
    Rock mechanics and rock engineering 22 (1989), S. 161-162 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01583961
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 185
    Electronic Resource
    Electronic Resource
    Book review (1989)
    Springer
    Rock mechanics and rock engineering 22 (1989), S. 159-159 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01583960
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 186
    Electronic Resource
    Electronic Resource
    Book review (1989)
    Springer
    Rock mechanics and rock engineering 22 (1989), S. 243-245 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01470989
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 187
    Electronic Resource
    Electronic Resource
    In situ test of a borehole extensometer (1989)
    Springer
    Rock mechanics and rock engineering 22 (1989), S. 289-297 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Summary Stresses in the Earth's crust are known to represent a key element of geodynamical processes at various spatial and temporal scales. Static stresses within lithospheric plates can be estimated on the basis of direct in situ measurements in boreholes or near the surface. Earthquake focal mechanisms yield the same type of information by sampling at greater depths. The quantification of geological deformations happens to be the principal tool to determine possible changes in time of the tectonic stress pattern. These changes can however be recorded only qualitatively and on the geological time scale. In seismic regions it is clear that the regional stress field varies on a time scale defined by the recurrence of earthquakes, say several tens of years. Our goal was to design a robust and cheap instrument which could continuously monitor stress changes at depths large enough to reduce meteorological influences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01262284
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 188
    Electronic Resource
    Electronic Resource
    Announcements (1989)
    Springer
    Rock mechanics and rock engineering 22 (1989), S. 309-309 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01262287
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 189
    Electronic Resource
    Electronic Resource
    Floor design in underground coal mines (1989)
    Springer
    Rock mechanics and rock engineering 22 (1989), S. 249-271 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Summary Floor failure and excessive heave in underground coal mines can jeopardize the stability of the whole structure, including the roof and pillars, due to differential settlements and redistribution of stress concentrations. Besides, floor failure is detrimental to haulageway operation and can lead to unacceptable conditions of high deformation. Thus, the design of any underground opening must consider roof/pillar and floor as one structural system. This paper presents guidelines for the design of mine floors, including the necessary field and laboratory investigations and the determination of the bearing capacity of floor strata. The design methodology is based essentially on a modified Hoek-Brown rock mass strength criterion. The main modifications are the introduction of the concept of the point of critical energy release to account for the long term strength, the inclusion of tensile strength and the adoption of a lithostatic state of stress in the rock mass. The determination of the dimensionless parametersm ands result from correlations with the RMR (“rock mass rating”) of the Geomechanics Clasification. Nine case histories, both in longwall and room and pillar coal mining, were analyzed with the proposed methodology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01262282
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 190
    Electronic Resource
    Electronic Resource
    Effect of retempering on the engineering properties of superplasticized concrete (1989)
    Springer
    Materials and structures 22 (1989), S. 212-219 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The effect of retempering non-superplasticized and superplasticized concrete (having nominal strengths of 17, 24, 31, 38 N mm−2) on the compressive strength, modulus of rupture, splitting tensile strength, modulus of elasticity and Poisson’s ratio was studied. Retempering of non-superplasticized concrete mixes reduces their engineering properties, whereas retempering of superplasticized mixes resulted in marginal increase in engineering properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472190
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 191
    Electronic Resource
    Electronic Resource
    Polarization resistance measurements in large concrete specimens: mathematical solution for a unidirectional current distribution (1989)
    Springer
    Materials and structures 22 (1989), S. 199-205 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The numerous cases of failure of concrete structures due to the corrosion of steel reinforcements increase the need to find an appropriate non-destructive technique to be used on-site for measuring the degradation rate of the rebars. Although corrosion potential mapping has been used, this technique has been shown to give only qualitative indications of the corrosion risk. In this paper, a preliminary attempt to apply the Polarization Resistance (Rp) method in large structures is presented. This method has proved to be a fast and quantitative technique in laboratory experiments. Assuming the model of ‘transmission line’, the distribution of the polarizing potential applied from a small counter electrode and the current flow are mathematically calculated. Three possibilities are given in order to calculate the true Polarization Resistance, Rp: (a) the apparent polarization resistance method; (b) the attenuation of potential method, and (c) the two counters method. Finally, the results of applying these equations to beams, fabricated in order to check the validity of the theory, are given. The agreement found confirms the promise of the model chosen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472188
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 192
    Electronic Resource
    Electronic Resource
    Influence de la composition volumique des mortiers sur leur résistance à la propagation des fissures (1989)
    Springer
    Materials and structures 22 (1989), S. 206-211 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Summary In a heterogeneous material such as mortar made with hydraulic binders, the mechanical behaviour depends on the different ingredients and their interactions. This article examines the role of the binder concentration in the matrix and the relative matrix-aggregate proportions in the conditions for resistance of mortar to crack propagation. This has been determined in Mode I by using a three-point bending test at controlled displacement on pre-notched test pieces. Research carried out at constant or non-constant work-ability indicates an improvement in the resistance to crack propagation when the binder concentration in the paste is increased or when the proportion of mineral aggregate (less deformable than the matrix) is higher. When the variations in design mix bring about difficulties in placing, the increase in the quantity of entrapped air and the porosity of the intergranular paste lead to a fall in mechanical properties. Variations in the quantity of sand induce variations in the resistance to crack propagation which are more extensive in relative values than those recorded for tensile-bending strength. This is attributed to the tortuosity of the crack path due to the heterogeneous nature of the medium. The relationships between the resistance to crack propagation and the tensile-bending strength are defined by experimentation.
    Notes: Résumé Dans un matériau hétérogène tel que le mortier ou le béton de liant hydraulique, le comportement mécanique dépend des différentes parties constitutives et de leur association. Nous examinons plus particulièrement ici le rôle de la concentration en liant dans la matrice et des proportions relatives matrice-granulats sur les conditions de résistance des mortiers à la propagation des fissures. Celle-ci a été déterminée en Mode I en utilisant un essai de flexion trois points, contrôlé en déplacement, sur des éprouvettes préalablement entaillées. Le rôle de la quantité d’air occlus et de la porosité de la pâte intergranulaire est montré; des relations entre la résistance à la propagation des fissures et les résistances en traction flexion sont établies par voie expérimentale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472189
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 193
    Electronic Resource
    Electronic Resource
    The determination of the permeability of concrete to oxygen by the Cembureau method—a recommendation (1989)
    Springer
    Materials and structures 22 (1989), S. 225-230 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract A committee was set up in 1981 by the Cembureau Working Party on the Quality of Concrete with the following aims and objectives: 1. To develop a suitable method for the measurement of the permeability of concrete to gas or water and to determine the effects of mix proportions and curing. 2. To establish the feasibility of obtaining concordant results in a number of participating laboratories. Eight European laboratories have participated in the study and carried out a number of co-operative programmes in the course of six years. This recommendation of the method. inclusive of apparatus and procedure, is based on the findings of the committee. The work has given rise to a number of reports, some of which have been published with the approval of this committee. A limited bibliography of recent papers which the committee has considered and discussed will be found appended to this recommendation. The chairmen of this committee were Mr H. W. W. Pollitt (1981–85) and Mr P. Dutron (1985–87). The address of Cembureau is 55 rue d’Arlon, B-1040 Bruxelles, Belgium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472192
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 194
    Electronic Resource
    Electronic Resource
    BM-1. Terminology of hydrocarbon binders (1989)
    Springer
    Materials and structures 22 (1989), S. 237-239 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472194
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 195
    Electronic Resource
    Electronic Resource
    Editorial (1989)
    Springer
    Materials and structures 22 (1989), S. 241-241 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472195
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 196
    Electronic Resource
    Electronic Resource
    Contrôle des matériaux de construction par dynamostratigraphie (1989)
    Springer
    Materials and structures 22 (1989), S. 231-236 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Summary The manufacture of building materials calls for systematic quality control in the laboratory. It is equally important to be able to carry out control on site, once the construction is completed, and then later during service. Dynamostratigraphy brings a solution to these two problems. This method is based on the measurement of the penetration force (R) of a drill driven simultaneously in rotation (ϕ) and sideways (x) at imposed rates. Recording the variation inR(x) indicates the variation in the mechanical resistance and thereby the thickness of the different constituents penetrated. Details are given of two examples of the use of dynamostratigraphy in the laboratory. When the material examined is not a stratified medium—a mortar—the resistance to penetration will give the possibility of comparing different design mixes (sand/cement) and their modification during drying. When the material is heterogeneous—concrete—the resistance to penetration defines the size of gravel and the quality of the mortar. In fact, dynamostratigraphy can be applied successfully to all materials.
    Notes: Résumé La fabrication des matériaux de construction nécessite des contrôles systématiques de qualité, en laboratoire. Il est tout aussi important de pouvoir effectuer des contrôlesin situ, une fois l’ouvrage terminé et dans le temps. La dynamostratigraphie apporte une solution à ces deux problèmes. Cette méthode est basée sur la mesure de l’effort de pénétration (R) d’un foret animé simultanément de mouvements de rotation (ϕ) et de translation (x) à des vitesses imposées. L’enregistrement de la variationR(x) permet de constater les variations de résistance mécanique et par là-même l’épaisseur des différents constituants traversés. Deux exemples d’utilisation de la dynamostratigraphie sont présentés à partir de mesures effectuées en laboratoire. Lorsque le matériau n’est pas stratifié—un mortier—la résistance à la pénétration permet de comparer différentes compositions (sable/ciment) et leurs évolutions au cours du séchage. Lorsque le matériau est hétérogène—un béton—la résistance à la pénétration décèle la taille des gravillons et la qualité du mortier. La dynamostratigraphie s’applique avec succès à tous les matériaux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472193
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 197
    Electronic Resource
    Electronic Resource
    Thermographie infrarouge d'un géotextile non tissé soumis à la traction (1989)
    Springer
    Materials and structures 22 (1989), S. 53-59 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Summary The existence of thermomechanical coupling is well known for solid materials stressed beyond the limit of reversibility. Infrared thermography can therefore be used as a noncontact technique for experimental analysis, very suitable for detecting the thermal dissipation generated by the plastic deformations which accompany ductile fracture. This method thus offers the possibility of defining a characteristic stability level for geotextiles subjected to tension, and of studying the mechanism of localization at failure.
    Notes: Abstract L'existence d'un couplage thermomécanique est bien connue pour des matériaux solides sollicités au-delà de leur limite de réversibilité. La thermographie infrarouge peut alors être utilisée comme technique d'analyse expérimentale sans contact, très performante pour détecter la dissipation thermique générée par des déformations plastiques qui accompagnent la rupture ductile. Cette méthode offre ainsi la possibilité de définir un seuil caractéristique de stabilité des géotextiles soumis à la traction et d'en étudier le mécanisme de localisation à la rupture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472695
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 198
    Electronic Resource
    Electronic Resource
    The fragility and ductility of composite engineering materials and structures: a few remarks (1989)
    Springer
    Materials and structures 22 (1989), S. 28-34 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract In the field of civil engineering, composite structures are in principle designed with a view to stable behaviour in the non-linear domain. Their design involves optimizing the choice of the materials used in these composite structures (the concrete and steel) and the choice of their spatial distribution (percentages and locations). A rigorous physical and mechanical analysis and clear definitions of what is meant by the ductility of the material and of the structure are necessary for the attainment of this objective. It is shown that such an approach leads in some cases to results at odds with the ideas generally accepted in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472692
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 199
    Electronic Resource
    Electronic Resource
    Steel-to-concrete bond after concrete splitting: test results (1989)
    Springer
    Materials and structures 22 (1989), S. 35-47 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The definite trend towards the use of large-diameter rebars and the introduction of high-strength steels (f y=500 to 600 MPa) make it necessary to study the effects of longitudinal splitting on the steel-to-concrete bond. The study of splitting effects requires firstly basic tests to be performed in order to gather experimental information on bond and confinement stresses acting at the bar-to-concrete interface. For this purpose, three series of tests were recently carried out at the Politecnico di Milano. The results make it possible to ascertain a few basic properties of the bond after concrete splitting, and to formulate empirical constitutive laws regarding the stresses and the displacements (bar slip and opening of the splitting crack). All specimens consisted of a short deformed bar embedded in a concrete block, which had a preformed splitting crack in the plane passing through the bar axis: twelve specimens (Tests A and C) were fitted up with a round deformed bar having crescent-shaped lugs (Db=18 mm); seven specimens (Tests B) were fitted up with a specially machined deformed bar having a rectangular cross-section and straigth, lugs, so that concrete deterioration close to the bar could be investigated at the surface of the specimen, by means of the moiré technique. The tests were carried out at constant slip rate, up to very large slip values ( $${{\delta _{t_{max} } } \mathord{\left/ {\vphantom {{\delta _{t_{max} } } {D_b = 0.25 to 0.30}}} \right. \kern-\nulldelimiterspace} {D_b = 0.25 to 0.30}}$$ ); both the ascending and the descending branches of the stress-slip curves were measured, for four different values of the opening of the splitting crack. The agreement among the results of the three series is generally satisfactory and often very good: consequently, constitutive laws regarding the four main variables (crack opening and bar slip, shear and confinement stresses) can be worked out, as will be shown in a companion paper on constitutive relationships and on concrete deterioration at the bar-to-concrete interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472693
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 200
    Electronic Resource
    Electronic Resource
    Performance of polyurethane sealants on a strain-cycling exposure rack (1989)
    Springer
    Materials and structures 22 (1989), S. 60-63 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Specimens of eight urethane-based sealants have been exposed on a rack that closely reproduces the width changes occurring in a building joint. Specimens that could not move were concurrently subjected only to weathering. After one year, three of the multi-component sealants exhibited good to excellent performance. One of the latter confirmed the results of a prior exposure, but with the other a repeat test in the second year revealed a much higher failure rate with a new batch. The remaining two multi-component and all three single-component urethanes failed in a few months, although priming the aluminium substrate delayed failure of one single-component sealant to the end of the year. The predominant effect of joint movement on sealant performance is shown by the lack of failure of any specimens that could not move. Recommendations are made on test conditions that provide the best evaluation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472696
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...