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  • 2000-2004
  • 1975-1979  (21)
  • 1950-1954
  • 1940-1944
  • 1978  (9)
  • 1977  (12)
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Erscheinungszeitraum
  • 2000-2004
  • 1975-1979  (21)
  • 1950-1954
  • 1940-1944
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    T-maze phototaxis ofDrosophila melanogaster and several mutants in the visual systems (1977)
    Springer
    Journal of comparative physiology 116 (1977), S. 209-225 
    Details
    ISSN: 1432-1351
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary T-maze phototaxis ofDrosophila melanogaster and several of its mutants was investigated as function of the light illuminating the mazes. For visible light the response curves of thewildtype are quite complex and nonmonotonic functions of the light intensity. The data are interpreted as a result of an interaction between visual subsystems: the system which receives inputs from receptor cells R1-R6 is inhibited by the system of receptor cells R7 and R8, probably by R8 alone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00605403
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  • 2
    Digitale Medien
    Digitale Medien
    An experimental-numerical hybrid technique for three dimensional stress analysis (1977)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 11 (1977), S. 1845-1863 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: The paper describes a numerical method for determining the stress distribution in the interior of a three-dimensional body using experimentally determined surface stresses, and the interior displacements from surface displacements. The normal and shear stresses inside the body are obtained by solving Laplace's equation in terms of sum of normal stresses together with the three-dimensional compatibility equations in terms of stresses, using the finite difference technique, when the stresses on the surface of the body are known. On the other hand if surface displacements are known (from which strain components could be determined) then displacement components in the interior of a body can be determined by solving Laplace's equation in terms of sum of normal strains together with the three-dimensional equilibrium equations in terms of displacements. It is shown that axi-symmetric problems can also be solved in an identical way by transforming the equations into cylindrical co-ordinates. The application of the method has been illustrated through several examples.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620111208
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  • 3
    Digitale Medien
    Digitale Medien
    Towards stress freezing in birefringent orthotropic composite models (1977)
    Springer
    Experimental mechanics 17 (1977), S. 317-320 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Birefringent composite models are fabricated using epoxy resin reinforced with unidirectionally oriented glass fibers. The mechanical and photoelastic properties of the material at room temperature are determined. To explore the possibility of application of stress-freezing technique to birefringent composite models, the behavior and properties of this material are studied at elevated temperature (at stress-freezing temperature of the resin). The properties of the material at room and at elevated temperatures are reported. The feasibility of stress freezing glass-fiber-reinforced epoxy composites with low-fiber-volume fraction is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02324963
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  • 4
    Digitale Medien
    Digitale Medien
    Ion-exchange equilibria between (Mn, Co)O solid solution and (Mn, Co) Cr2O4 and (Mn, Co) Al2O4 spinel solid solutions at 1100° C (1977)
    Springer
    Journal of materials science 12 (1977), S. 481-488 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The compositions of the (Mn,Co)O solid solution with rock salt structure in equilibrium with (Mn,Co)Cr2O4 and (Mn,Co)Al2O4 spinel solid solutions have been determined by X-ray diffraction measurements at 1100° C and an oxygen partial pressure of 10−10 atm. The ion exchange equilibria are quantitatively analysed, using values for activities in the (Mn,Co)O solid solution available in the literature, in order to obtain activities in the spinel solid solutions. The MnAl2O4-CoAl2O4 solid solution exhibits negative deviations from Raoult's law, consistent with the estimated cation disorder in the solid solution, while the MnCr2O4-CoCr2O4 solid solution shows slightly positive deviations. The difference in the Gibbs free energy of formation of the two pure chromites and aluminates derived from the results of this study are in good agreement with recent results obtained from solid oxide galvanic cells and gas-equilibrium techniques.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00540270
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  • 5
    Digitale Medien
    Digitale Medien
    Phase relationships in the system Ni-W-O and thermodynamic properties of NiWO4 (1977)
    Springer
    Journal of materials science 12 (1977), S. 1647-1652 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The phase diagram of the Ni-W-O system at 1200 K was established by metallographic and X-ray identification of the phases present after equilibration at controlled oxygen potentials. The oxygen partial pressures over the samples were fixed by metered streams of CO+CO2 gas mixtures. There was only one ternary oxide, nickel tungstate (NiWO4), in the Ni-W-O system at a total pressure of 1 atm, and this compound decomposed to a mixture of Ni+WO2.72 on lowering the oxygen potential. The Gibbs' free energy of formation of NiWO4 was determined from the measurement of the e.m.f. of the solid oxide galvanic cell, Pt, Ni+NiWO4+WO2.72/CaO-ZrO2/Ni+NiO, Pt and thermodynamic properties of tungsten and nickel oxides available in the literature. For the reaction, NiO(s)+WO3(s)→NiWO4(s) ΔG°=−10500−0.708 T (±250) cal mol−1.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00542815
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  • 6
    Digitale Medien
    Digitale Medien
    A numerical method for separation of stresses in photo-orthotropic elasticity (1978)
    Springer
    Experimental mechanics 18 (1978), S. 61-66 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A numerical method is suggested for separation of stresses in photo-orthotropic elasticity using the numerical solution of compatibility equation for orthotropic case. The compatibility equation is written in terms of a stress parameter S analogous to the sum of principal stresses in two-dimensional isotropic case. The solution of this equation provides a relation between the normal stresses. The photoelastic data give the shear stress and another relation between the two normal stresses. The accuracy of the numerical method and its application to practical problems are illustrated with examples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02324501
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  • 7
    Digitale Medien
    Digitale Medien
    Mass spectrometry of dimethylthiophosphinates of aromatic hydroxy compounds (1978)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 302-311 
    Details
    ISSN: 0306-042X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The mass spectra of 20 differently substituted dimethylthiophosphinic esters of aromatic hydroxy compounds are presented. Fragmentation routes were investigated using high resolution mass measurements, decoupled metastable determinations and deuterium labelling. All compounds exhibited abundant molecular ions and typical phosphorus-containing ions. Characteristic elimination processes strongly dependent upon the respective type of substitution were observed. Due to their high stability, their great ease of formation and their good gas chromatographic properties these new types of derivatives are of special interest for establishing gas chromatography mass spectrometry profiles of acidic catecholamine metabolites.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200050406
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  • 8
    Digitale Medien
    Digitale Medien
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. XXVIII. Zur Benzylierung der Acetylacetonate des dreiwertigen Titans, Vanadiums und Chroms (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 447 (1978), S. 136-142 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Contribution to the Chemistry of Transition Metal Alkyl Compounds. XXVIII. Benzylation of the Trivalent Titanium, Vanadium, and Chromium AcetylacetonatesBzCr(acac)2, 2Bz(Vacac)2 · Mg(acac)2 and 3BzV(acac)2 · Al(acac)3 were obtained in definite form by reaction of Cr(acac)3 and V(acac)3 with Bz3Al, Bz2Mg, and BzMgCl. Ti(acac)3, reacts with Bz2Mg and BzLi forming deep green Bz3Ti, which could'nt be isolated free of impurities (Bz = C6H5CH2, acacH = acetylacetone).
    Notizen: Bei Reaktionen von Cr (acac)3 und V(acac)3 mit Bz3Al, Bz2Mg und BzMgCl wurden als definierte Verbindungen BzCr(acac)2, 2BzV(acac)2 · Mg(acac)2 und 3BzV(acac)2, Al(acac)3 erhalten. Aus Ti(acac)3 und Bz2Mg bzw. BzLi entsteht tiefgrünes Bz3Ti, das jedoch nicht frei von Verunreinigungen erhalten werden konnte. (Bz = C6H5CH2, acacH = Acetylaceton).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19784470114
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  • 9
    Digitale Medien
    Digitale Medien
    Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. XXIII. Phosphinstabilisierte Benzylverbindungen des Nickels, Kobalts und Eisens (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 187-192 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Contributions to the Chemistry of Transition Metal Alkyl Compounds. XXIII. Phosphine Complexes of Benzyl Compounds of Nickel, Cobalt, and IronThe benzyl compound BzNi(acac) · PPh3 · 2 O(C2H5)2 could be obtained from Ni(acac)2, Bz3Al, and PPh3 in diethyl ether as a solvent. Using PBz3 and P(C6H11)3 complexes of the type BzNi(acac) · PR3 are formed. In a similar way Co(acac)3 and Fe(acac)3 react to BzCo(acac)2 · 2 PPh3, BzCo · 2 PPh3 · 2 O(C2H5)2 and BzFe · 3 PPh3 · 2 O(C2H5)2 (acacH = acetylacetone; Bz = C6H5CH2).
    Notizen: Aus Ni(acac)2, Bz3Al und PPh3 konnte in Diäthyläther als Lösungsmittel die Benzylverbindung BzNi(acac) · PPh3 · 2 O(C2H5)2 gewonnen werden. Bei Verwendung von PBz3 und P(C6H11)3 entstehen Komplexe des Typs BzNi(acac) · PR3. Auf ähnliche Weise wurden aus Co(acac)3 und Fe(acac)3 die Komplexe BzCo(acac)2 · 2 PPh3, BzCo · 2 PPh3 · 2 O(C2H5)2 und BzFe · 3 PPh3 · 2 O(C2H5)2 erhalten (acacH = Acetylaceton; Bz = C6H5CH2).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19774320126
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  • 10
    facet.materialart.
    Unbekannt
    Phase relationships in the system Ni-W-O and thermodynamic properties of NiWO4 (1977)
    Springer
    Details
    Publikationsdatum: 1977-08-01
    Print ISSN: 0022-2461
    Digitale ISSN: 1573-4803
    Thema: Maschinenbau , Physik
    Publiziert von Springer
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