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  • 1995-1999
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  • 1991  (88)
  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 31 (1991), S. 837-857 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The finite strip method is extended to the non-linear, static analysis of cylindrical shells. Large deflection effects are incorporated via first-order non-linearities in the strain-displacement relations, and material non-linearities are included via the von Mises yield criteria and associated flow rule. Numerical results are presented for various example problems including the diaphragm supported cylindrical shell-roof problem, an axisymmetric cylindrical shell loaded by radial pressure, the cylindrical shell-roof problem with clamped curved ends and a pressure loaded cylindrical panel clamped all round. The results are compared with known results from analytical and/or finite element analyses. The results indicate that a single bending mode in the strip direction is sufficient in most cases to yield engineering accuracy for preliminary design purposes.
    Additional Material: 14 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 32 (1991), S. 79-101 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Issues related to the constitutive modelling and computational treatment of strain localization are examined for the class of rate independent solids. The significance of the constitutive description in localization problems is emphasized and constitutive models currently employed are briefly reviewed. Difficulties faced in finite element analysis, fundamentally associated with the loss of ellipticity of the related boundary value problem, and present trends in the computational treatment are discussed and illustrated by numerical examples.
    Additional Material: 17 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 592 (1991), S. 207-216 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and 29Si NMR Spectroscopic Investigation of Polymers with Definite Silicic Acid UnitsThree polymers were synthesized by additive reaction of the cage-like double fourring (D4R) silicic acid derivatives [(CH3)2HSi]8Si8O20 and [CH2=CH(CH3)2Si]8Si8O20 resp., with the unsaturated diviyltetramethyldisiloxane or the multiple functional tetramethylcyclotetrasiloxane and polymethylhydrogensiloxane in a molar ratio of functional groups 1:1. By means of 29Si solid state NMR spectroscopy was shown that the in organic solvents insoluble polymers are built up by D4R silicic acid units, which are connected by chain-like or cyclic siloxane bridges. With increasing functional groups of the reactants the sterical hindrance of the reaction of D4R derivates grows. The polymers show small surfaces of 1 to 8 m2/g.
    Notes: Durch Additionsreaktion der käfigartigen Doppelvierring-(D4R-)kieselsäurederivate [(CH3)2Hsi]Si8O20 mit dem zweifach ungesättigten Divinyltetramethyldisiloxan bzw. den mehrfachfunktionellen Tetramethylcyclotetrasiloxan und Polymethylhydrogensiloxan in molaren Verhältnis der funktionellen Gruppen von 1:1 wurden 3 in organischen Lösungsmitteln unlösliche Polymere hergestellt. 29Si-Festkörper-NMR-Untersuichungen zeigen, daß sich die Polymere aus D4R-Kieselsäureeinheiten aufbauen, die über ketten- oder ringförmige Siloxanbrückcn miteinander vernetzt sind. Mit zunehmender Zabl funktioneller Gruppen in den Reaktionspartnern der D4R-Derivate wächst die räumliche Behinderung der Vernetzungsreaktionen. Die Polymere weisen nur eine kleine Oberfläche zwischen 1 und 8 m2/g auf.
    Additional Material: 2 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Nickel(II), cobalt(II) phosphinothioic-N-organylamidato chelates ; magnetism ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nickel(II) and Cobalt(II) Phosphinothioic-N-Organylamidato Chelates [R2P(S)NR′]2M: Magnetic Properties and Crystal StructuresPhosphinothioic-N-organylamidato chelates [R2P(S)NR′]2M (R, R′ = organyl; M = Ni, Co) 1, 2 have been obtained by reaction of MCl2 with [R2P(S)NR′]Li. According to magnetic and spectroscopic measurements (UV/VIS) NiII complexes 1 d (R = i-Pr, R′ = Me), 1 h (R = t-Bu, R′ = Me), 1 i (R = t-Bu, R′ = Et) and 1 m (R = t-Bu, R′ = Ph) are planar in solid state. For 1 i transgeometry of the donor atoms in the chromophore NiN2S2 has been proved. NiII complexes 1 a (R = Me, R′ = i-Pr) and 1 b (R = Me, R′ = c-Hex) show magnetic moments of c. 1.2 B.M. Magnetic moments of all other solid complexes 1, 2 are in a range usually found with tetrahedral coordination. In solution 1 c (R = Me, R′ = t-Bu), 1 e-g (R = i-Pr; R′ = i-Pr, c-Hex, t-Bu), and 1 j-l (R = t-Bu; R′ = i-Pr, c-Hex, t-Bu) are entirely tetrahedral while with 1 a, 1b, 1 i, and 1 m there exists an equilibrium planar ⇌ tetrahedral. This is shifted to the right with increasing R and R′ the influence of R being less than that of R′. The crystal structures of 1 k (R = t-Bu, R′ = c-Hex) and 2 a (R, R′ = t-Bu) reveal a distorted tetrahedral coordination. 1 k: orthorhombic, a = 1 343.7(1), b = 1 514.9(1), c = 1 632.4(2) pm; Pccn, Z = 4, 3 205 reflections, R = 0.03. 2 a: orthorhombic, a = 1 637.9(2), b = 2 997.0(3), c = 1 282.4(1) pm; Pbca, Z = 8, 4 742 reflections, R = 0.04.
    Notes: Durch Umsetzung von MCl2 mit [R2P(S)NR ′]Li wurden die Thiophosphinsäureamidato-Chelate [R2P(S)NR ′]2M (R, R′ = Organyl; M = Ni, Co) 1, 2 erhalten. Magnetischen und spektroskopischen Messungen (UV/VIS) zufolge sind die NiII-Komplexe 1 d (R = i-Pr, R′ = Me), 1 h (R = t-Bu, R′ = Me), 1i (R = t-Bu, R′ = Et) und 1m (R = t-Bu, R′ = Ph) im Festkörper planar, wobei für 1i trans-Stellung der Donatoratome im Chromophor NiN2S2 nachgewiesen wurde. Im Festzustand weisen die NiII-Komplexe 1a (R = Me, R′ = i-Pr) und 1 b (R = Me, R′ = c-Hex) magnetische Momente von ca. 1,2 B.M. auf, während die aller anderen Komplexe 1, 2 in einem Bereich liegen, wie man ihn bei tetraedrischer Koordination erwartet. In Lösung erweisen sich 1 c (R = Me, R′ = t-Bu), 1 e-g (R = i-Pr; R′ = i-Pr, c-Hex, t-Bu) und 1 j-l (R = t-Bu; R′ = i-Pr, c-Hex, t-Bu) als rein tetraedrisch, während 1 a, 1 b, 1 i und 1 m einem Konformerengleichgewicht planar ⇌ tetraedrisch unterliegen, das sich mit steigender Raumerfüllung von R und R′ nach rechts verschiebt. Der Einfluß von R ist hierbei geringer als der von R′. Kristallstrukturanalysen für 1 k (R = t-Bu, R′ = c-Hex) und 2 a (R, R′ = t-Bu) bestätigen eine verzerrt tetraedrische Koordination. 1 k: rhombisch, a = 1 343,7(1), b = 1 514,9(1), c = 1 632,4(2) pm; Pccn, Z = 4; 3 205 Reflexe, R = 0,03. 2 a: rhombisch, a = 1 637,9(2), b = 2 997,0(3), c = 1 282,4(1) pm; Pbca, Z = 8; 4 742 Reflexe, R = 0,04.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 13 (1991), S. 109-129 
    ISSN: 0271-2091
    Keywords: Bubbles ; Finite difference ; Initial motion ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A two-dimensional, transient, finite difference technique based on a volume fraction specification of the free surface position and accounting for the effects of surface tension is shown to accurately predict the initial motion of large cylindrical and spherical bubbles. The predictions compare very favourably with the experimental data of Walters and Davidson. The initial acceleration of cylindrical and spherical bubbles is properly predicted as g and 2g respectively. The penetration of a tongue of liquid from below is the dominant process by which large deformations from the original shape take place and is well predicted by the model in both cases. For the spherical case the eventual transition into a toroidal bubble is demonstrated and the circulation associated with a rising toroidal bubble as a function of its volume upon release is shown to agree very well with experiments. Iterative linear equation-solving techniques applicable to the special nature of the linear system resulting from such a free surface specification are surveyed and a simple Jacobi iteration based on red-black ordering is found to perform well. The impact of the free surface on the relaxation of the linear system and the convergence criteria is also explored.
    Additional Material: 11 Ill.
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  • 7
    ISSN: 0009-2940
    Keywords: Sulfur diimides ; 1,3-Cycloaddition, reductive ; 1,2,4,3-Thiadiazaboretidines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Properties of 1,2,4,3-Thiadiazaboretidines. Crystal Structure of 2,4-Di-tert-butyl-3-phenyl-1,2,4,3-thiadiazaboretidineReaction of sulfur diimides with alkyl(aryl)bis(methylthio)boranes leads to reductive 1,3-cycloaddition of the NSN sequence with formation of the 1,2,4,3-thiadiazaboretidines 2a-g. NMR (1H, 11B, 13C, 15N, 29Si), mass spectra and the results of the X-ray analysis of 21 are reported and discussed. The 11B chemical shifts have been calculated for 3-phenyl-1,2,4,3-thiadiazaboretidine and some related model compounds by the IGLO method and correlate acceptably with the experimental values.
    Additional Material: 1 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1711-1714 
    ISSN: 0009-2940
    Keywords: 2,4,6,8,10-Hexaoxa-1,3,5,7-tetraphosphatricyclo[3.3.1.1]decane 1-sulfide, molecular and crystal structure ; P4O6 derivatives ; Calculations, SCF, for P4O7 and P4O6S ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: P4O7 and P4O6S, Comparison of Molecular and Crystal StructureSingle crystals of P4O6S were grown for the first time. By X-ray diffraction the space group (P21/c), the unit cell [α = 813.5(1), b = 938.3(1), c = 993.1(1) pm; β = 90.27(1)°], and the crystal and molecular structure have been determined. As compared to P4O7, the geometry of the P4O6 cage remains virtually unchanged upon substitution of the terminal oxygen atom by a sulfur atom. Calculated charge distributions clearly confirm the experimental results. With the exception of P(1), to which the additional chalcogen atom is attached, the effective charges at all other atoms seem not to be affected by an exchange of the terminal oxygen atom by a sulfur atom.
    Additional Material: 2 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 83-85 
    ISSN: 0009-2940
    Keywords: 1,3,2λ5,4λ5-Dithiadistannetane, 2,4-bis[benzoyl(thiobenzoyl)methanato-O,S]-2,4-dibutyl- ; Anisobidentate ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Butyltin triisopropoxide reacts with benzoyl(thiobenzoyl)methane (LH) to yield BuSn(S)L and an organic sulfide 2 instead of the expected BuSnL3. The use of other butyltin(IV) starting materials invariably leads to the same products. From an X-ray structure determination the tin sulfido complex is found to be a centrosymmetric dimer, [BuSn(S)L]2 (1) with a planar four-membered Sn2S2 ring containing pentacoordinated tin atoms.
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 32 (1991), S. 275-293 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The performance of multiplier algorithms for structural optimization has been significantly improved by using trust regions. The trust regions are constructed using analytical second order sensitivity, and within this region, the augmented Lagrangian φ is minimized subject to bounds. Evaluation of first and second derivatives of φ by the adjoint method does not require derivations of individual (implicit) constraint functions, which makes the method economical. Eight test problems are considered and a vast improvement over previously used multiplier algorithms has been noted. Also, the algorithm is robust with respect to scaling, input parameters and starting designs.
    Additional Material: 7 Ill.
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