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  • Aircraft Design, Testing and Performance
  • Aircraft Stability and Control
  • Fisheries
  • GENERAL
  • Inorganic Chemistry
  • 1990-1994  (128)
  • 1955-1959  (56)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Über Benzal-Derivate des L-Idits (1959)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 2694-2700 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die von E. Fischer und G. Bertrand beschriebenen Tribenzal-L-idite erwiesen sich als identisch mit 1.3;2.4;5.6-Tribenzal-L-idit. Unter wenig abgeänderten Versuchsbedingungen entsteht neben dem Tribenzal-L-idit ein Dibenzal-Derivat, welches einen 2.3.4.5-, wahrscheinlich 2.4;3.5-Dibenzal-L-idit darstellt. Es wird auf den unterschiedlichen Verlauf der Acetalisierung des L-Idits mit Benzaldehyd, bzw. Formaldehyd hingewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19590921103
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  • 2
    Electronic Resource
    Electronic Resource
    Kristall- und Molekülstruktur von Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III) (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 167-174 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III)The crystal and molecular structure of tris(1,1-diethyl-3-benzoyl-thioureato)-ruthenium(III) has been determined by an X-ray structure analysis. The compound crystallizes in the trigonal space group P3 with a = 16.556, c = 8.476 Å and Z = 2. The structure was solved by Patterson methods and refined to a final R value R = 0.074 for 801 observed reflections. The molecule has the symmetry C3. The coordination polyhedron is an octahedron with facial arrangement of the ligator atoms. The Ru—S and Ru—O distances are 2.293 Å and 2.047 Å, respectively.
    Notes: Die Kristall- und Molekülstruktur von Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III) wurde durch Röntgenkristallstrukturanalyse bestimmt. Die Verbindung kristallisiert trigonal in der Raumgruppe P3 mit den Gitterkonstanten a = 16,556, c = 8,476 Å und Z = 2. Die Struktur wurde mittels Patterson-Methoden gelöst und bis zu einem abschließenden R-Wert R = 0,074 für 801 beobachtete Reflexe verfeinert. Das Molekül besitzt die Symmetrie C3. Das Koordinationspolyeder ist ein Oktaeder mit facialer Anordnung der Ligator-Atome. Die Ru—S- und Ru—O-Abstände betragen 2,293 Å bzw. 2,047 Å.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905800120
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the Cationic Arrangement in Sn2F6 from neutron powder diffraction (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 590 (1990), S. 173-180 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A structural determination of the high-temperature form γ-Sn2F6 has been performed using neutron diffraction. This mixed fluoride exhibits the cubic ordered ReO3-type structure (Fm3m space group) with a = 8.321(4) Å at 497 K. The bond lengths SnII—F and SnIV—F give evidence of the presence of tin(II) in the (a) site and tin(IV) in the (b) site. A cationic ordering has also been found in the intermediate form β-Sn2F6 whose structure is related to the LiSbF6-type.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905900118
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Cs2HgPdCl6, eine Verzerrungsvariante der ChloroperowskiteProfessor Hans-Joachim Seifert zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 603 (1991), S. 69-76 
    Details
    ISSN: 0044-2313
    Keywords: Dicesium mercury(II) palladium(II) hexachloride ; preparation ; crystal structure ; group-subgroup relation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Cs2HgPdCl6, a Distorted Variant of ChloroperovskitsCs2HgPdCl6 single crystals show tetragonal symmetry with the space group I 4/m m m (No. 139) with 2 formular units per unit cell. The lattice parameters are a = 7.432(4) Å, c = 10.874(7) Å. The atomic arrangement of Cs2HgPdCl6 is explored by X-ray crystal structure analysis. The important polyhedrons are square-planar PdCl4 groups and HgCl2 dumbbells. The PdCl4 group is completed by two further chlorine atoms to a elongated octahedron and four further chlorine atoms form with the HgCl2 dumbbell a compressed octahedron. The crystal structure of Cs2HgPdCl6 is compared with the arrangement in halogenoperovskits and in Rb2PdCl4 [3].
    Notes: Die Verbindung Cs2HgIIPdIICl6 läßt sich durch Festkörperreaktion phasenrein darstellen. Sie kristallisiert in der Raumgruppe I 4/m m m (No. 139) mit a = 7,432(4) Å, c = 10,874(7) Å, Z = 2. Die Kristallstruktur wurde mit röntgenographischen Methoden an Einkristallen ermittelt. Pd2+ ist quadratisch-planar und Hg2+ hantelförmig von Cl-umgeben. In zweiter Nachbarschaft ergänzen weitere Cl- zu gestreckten bzw. gestauchten Oktaedern. Dieses Bauprinzip entspricht dem Aufbau von Cs2AuIAuIIICl6 [1, 2]. Es besteht direkte kristallchemische Beziehung zur Kristallstruktur der Halogenoperowskite bzw. des K2PdCl4-Typs.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916030110
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  • 5
    facet.materialart.
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    External-store drag reduction at transonic and low supersonic Mach numbers by application of Baldwin's moment-of-area rule (1955)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: GENERAL
    Type: NACA Conf. on Aerodyn. of High Speed Aircraft; p 93-103
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Optimum Design of Aerospace Structural Components Using Neural Networks (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The application of artificial neural networks to capture structural design expertise is demonstrated. The principal advantage of a trained neural network is that it requires a trivial computational effort to produce an acceptable new design. For the class of problems addressed, the development of a conventional expert system would be extremely difficult. In the present effort, a structural optimization code with multiple nonlinear programming algorithms and an artificial neural network code NETS were used. A set of optimum designs for a ring and two aircraft wings for static and dynamic constraints were generated using the optimization codes. The optimum design data were processed to obtain input and output pairs, which were used to develop a trained artificial neural network using the code NETS. Optimum designs for new design conditions were predicted using the trained network. Neural net prediction of optimum designs was found to be satisfactory for the majority of the output design parameters. However, results from the present study indicate that caution must be exercised to ensure that all design variables are within selected error bounds.
    Keywords: Aircraft Design, Testing and Performance
    Type: NASA-TM-112741 , NAS 1.15:112741 , Computers & Structures (ISSN 0045-7949); 48; 6; 1001-1010
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
    Electronic Resource
    Electronic Resource
    Cyclization of a chiral α-(δ′-benzyloxyalkyl)acrylate to a novel tetrahydrofuran derivative (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 2455-2456 
    Details
    ISSN: 0009-2940
    Keywords: Tetrahydrofurans ; Acrylates, α-(δ′-hydroxyalkyl)- ; Aldehydes, β-hydroxy- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methyl 3-hydroxy-2-(iodomethyl)-5-methyltetrahydrofuran-2-carboxylate (4) is synthesized from (3S)-3-(benzyloxy)butanal (2) via methyl 5-(benzyloxy)-3-hydroxy-2-methylenehexanoate (3a) as intermediate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901231231
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  • 8
    Electronic Resource
    Electronic Resource
    Folgereaktionen von Sulfenen aus Sulfonylchloriden und tertiären Aminen, 3[1,2] Kristallstrukturanalyse von Bis(trimethylammoniosulfonyl)methanid-tetraphenylborat. - n-σ*-Wechselwirkungen (Hyperkonjugation und Homohyperkonjugation) in Sulfen-Amin-S,N-Addukten (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1621-1626 
    Details
    ISSN: 0009-2940
    Keywords: Bis(trimethylammoniosulfonyl)methanide tetraphenylborate ; Sulfene-amine adducts ; Hyperconjugation, negative ; Homohyperconjugation, negative ; n-σ* interactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Secondary Reactions of Sulfenes from Sulfonyl Chlorides and Tertiary Amines, 3[1,2]. - Crystal Structure Analysis of Bis(trimethylammoniosulfonyl)methanide Tetraphenylborate. - n-σ*-Interactions (Hyperconjugation and Homohyperconjugation) in Sulfene - Amine S,N-AdductsBis(trimethylammoniosulfonyl)methanide chloride (3b) could be obtained in 97% yield by reaction of methanedisulfonyl dichloride (5) with three equivalents of trimethylamine. X-ray analysis of the tetraphenylborate 3c reveals that the conformation of the cation is determined by nC-σ*S-N interactions (negative hyperconjugation) and by nC-σ*N-C interactions (negative homohyperconjugation). These effects were deduced from alterations of the bond lengths within the S-N-C chains which are coplanar to the occupied pz orbital at the central C atom. Comparison with known crystal structure data shows, that sulfene - amine S,N-adducts generally have the zwitterionic ammoniosulfonylmethanide structure 3, stabilized by nC-σ* interactions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250717
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  • 9
    Electronic Resource
    Electronic Resource
    Crystal Structure of the Explosive Parent Benzyne Precursor: 2-Diazoniobenzenecarboxylate Hydrate (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 243-249 
    Details
    ISSN: 0009-2940
    Keywords: Benzyne precursor ; Neighboring group interactions ; Incipient nucleophilic attack ; 2-Diazoniobenzenecarboxylate ; Calculations, ab initio, MO ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structure of the highly unstable benzyne precursor 2-diazoniobenzenecarboxylate (3) has been determined by single-crystal X-ray diffraction. The structure is discussed in comparison to ab initio results for several conformers of 3, related aromatic diazonium ions, and phenyl cation and also to crystal structures of simple diazonium ion salts and of benzoates. Structural features and characteristic distortions are related to the electron density distributions and to intra- and intermolecular interactions between the neighboring functional groups.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260133
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  • 10
    Electronic Resource
    Electronic Resource
    Transition Metal Chemistry of Main Group Hydrazides, VI. New Directed Synthetic Strategies to Functionalized Heterocyclic Phosphorus(III) Hydrazides. First Examples of Crystal and Molecular Structures of [RPN(Me)N(H)]2 (R = Et, Ph, and tBu) (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 979-984 
    Details
    ISSN: 0009-2940
    Keywords: Cyclophosphahydrazides ; Dinitrogen-bridged ; Conformation ; Chair and Boat forms ; Dinuclear Mo(0) complexes ; 1,2,4,5,3,6-Tetrazadiphosphorinanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of methylhydrazine with RPC12 (R = Et, tBu, and Ph) produced the cyclic phosphorus (III) hydrazides (1,2,4,5,3,6-tetrazadiphosphorinanes) [RPN(Me)N(H)2 (R = Et, 1; (Ph, 2; tBu, 3) in good yields. The 1H-and 31P-NMR spectroscopic analysis indicated that 1 exists in chair and boat conformations. However, it crystallizes in the chair conformation exclusively. The X-ray crystallographic investigation of all the three cyclo-phosphorus hydrazides 1-3 confirms the existence of these compounds in the chair conformations in the solid state. The reaction of Mo(CO)4-(NHC5H10)2 with 1 and 2 gives the dinuclear Mo(0) complexes [{Mo(CO)4(NHC5H10)}2(μ-[RPN(Me)N(H)]2}] (R = Et, 5; Ph, 6). Based on 1H- and 31P-NMR spectroscopic data, a bridging dinuclear dimetallic formulation is proposed for 5 and 6. The IR spectra indicate that the carbonyls are disposed in cis-geometry around the Mo(0) center.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270603
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