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  • 1
    Digitale Medien
    Digitale Medien
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 36 (1993), S. 1279-1298 
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: An error estimate for the finite element method is presented in this paper. The error is identified as the response to a set of residual forces, and a complementary analysis provides an upper bound estimate of the global energy of the error. The inequality proposed by Babuška and Miller1 is then employed to bound the error in stress and displacement at a point. The formula is derived for two-dimensional elasticity, but the procedure is general; and can be applied to three-dimensional and other problems. Numerical experiments using the procedure are carried out and the results are given for the four-node bilinear compatible element and plane stress.
    Zusätzliches Material: 19 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2513-2517 
    ISSN: 0009-2940
    Schlagwort(e): Dibenzo [CH]8 hydrocarbons ; Flow-vacuum pyrolysis ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The flow-vacuum pyrolysis of dibenzo [CH]8 hydrocarbons 2,3,4, and 5 are studied at 1 Torr and in the temperature range between 400 and 650°C. The following new transformations have been observed: 2⇆4, 2→5, 3→5, 3⇆4, 3→2, 5→11, the last three presenting analogies in the [CH]8 and/or benzo [CH]8 series. A reaction mechanism is suggested.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 9 (1993), S. 917-924 
    ISSN: 1069-8299
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: The reduction of stress concentration around a circular hole in a dynamically loaded plate by introducing auxiliary holes around the original hole is studied numerically. The solution of this plane stress problem is carried out in the Laplace transformed domain with the aid of the boundary-element method, and subsequently the time domain response is obtained by numerically inverting the transformed solution. Numerical examples are presented which demonstrate a stress reduction as high as 18 per pent by the introduction of two auxiliary holes in the loading direction for the uniaxial case.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 16 (1993), S. 353-364 
    ISSN: 0271-2091
    Schlagwort(e): Ice keels ; Drag ; Stratified flow ; Marker and cell ; SOLA-VOF ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: A numerical investigation of the flow of two immiscible stratified fluids under an isolated keel has been undertaken. The investigation utilized the two-dimensional Euler equations for incompressible flow, and the solution of these equations has been obtained by using the well-known finite volume marker and cell approach. Experimental drag-force measurements are also presented for a family of two-dimensional topographic models of fixed height with increasing surface slopes in a two-layer density system. The range of flow speeds explored covers the Froude number range from subcritical to fully supercritical. The drag force measurements are augmented by detailed observations of the interface distortion. The results clearly show large drag increases arising from the internal wave systems generated in the stratified flow. Very good agreement has been found between the experimental and numerical results for both the interface shape between the two fluids and the drag force on a variety of keels.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 16 (1993), S. 813-825 
    ISSN: 0271-2091
    Schlagwort(e): Bubble formation ; Bubble growth ; Bubbling regimes ; Free boundaries ; Interface advection ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: The formation of large gas bubbles at submerged orifices is investigated numerically with a two-dimensional, transient, finite difference model using a volume fraction specification to track the movement of the gas-liquid interface. Experimentally observed features of large-bubble formation such as the initial toroidal shape of the bubbles and the penetration of liquid down the pipe centreline are well predicted by the model. The expected oscillatory nature of growth is also observed. The bubble departure volume corresponds to experiments and to the model of Davidson and Schuler. At present the simulations do not extend far enough to investigate multiple-bubble ejection and important bubble-to-bubble interactions during growth and after departure.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 901-904 
    ISSN: 0044-2313
    Schlagwort(e): Iron chlorides, lithium ; Mößbauer spectra ; neutron diffraction ; Suzuki type ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Mößbauer and Neutron Diffraction Studies on Li6FeCl8On Suzuki-Type Li6FeCl8 Mößbauer spectra and neutron powder diffraction data are presented. The Suzuki-type structure (space group Fm3m, Z = 4, 1 031.11(1) pm) was supported refining by the Rietveld method (program PROFIL) to a final R1 = 6.8%. The Mößbauer spectra confirm the ideal octahedral coordination of the Fe2+ ions (no quadrupole splitting). The isomer shift of 1.097(1) mm s-1 at 295 K resembles those of other ferrous chlorides. At temperatures above the phase transition to deficient NaCl-type solid solution the half-width of the Mößbauer signal strongly increases.
    Notizen: Die Mößbauer-Spektren und Neutronenpulver-Strukturdaten der Suzukiphase Li6FeCl8 werden mitgeteilt. Die Struktur (Raumgruppe Fm3m, Z = 4, a = 1 031,11(1) pm) konnte mit Hilfe des Rietveld-Verfahrens (Programm PROFIL) bis zu einem R-Wert R1 = 6,8% verfeinert werden. Die Mößbauer-Spektren ergeben eine exakt oktaedrische Umgebung von Fe2+ (keine Quadrupol-Aufspaltung). Die Isomerieverschiebung (1,097(1) mm s-1 bei 295 K) entspricht der anderer Eisen(II)chloride. Bei Temperaturen oberhalb der Phasenumwandlung zum defizienten NaCl-Typ-Mischkristall nimmt die Halbwertsbreite des Mößbauer-Signals zu.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    ISSN: 0009-2940
    Schlagwort(e): Cyclopentadienyl complexes ; Cyclooctatetraenyl complexes ; Yttrium compounds ; Terbium compounds ; Lutetium compounds ; Lanthanoides, organo-, alkoxides ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Organometallic Compounds of the Lanthanoids, 73[1]. - Synthesis and Structure of New Monocyclooctatetraenyl Complexes of Yttrium, Terbium, and Lutetium[(C8H8)Ln(μ1-Cl)(THF)]2 (Ln=Y, Lu) react with NaOR (R=Ph, C6H3Me2-2,6) to give the dinuclear cyclooctatetraenyl rare earth alkoxides [(C8H8)Ln(μ1-OR)(THF)]2 [R=Ph, Ln=Y (1a), Lu (1b); R=C6H3Me2-2,6, Ln=Y (2a), Lu (2b)]. The reactions of [(C8H8)Ln(μ1-Cl)(THF)]2 with LiOC(tBu)3, NaOSiPh3, and NaC5H3tBu2 result in the formation of (C8H8)LnOC(tBu)3(THF) [Ln=Y (3a), Lu (3b)], (C8H8)LnOSiPh3(THF) [Ln=Y (4a), Lu (4b)], and (C8H8)Tb(C5H3tBu2) (5), respectively. Treatment of (C8H8)Y(C5Me5) with acetylacetone yields (C5Me5)Y(acac)2 (6). The 1H-and 13C-NMR and mass spectra of the new compounds as well as the X-ray crystal structures of 1a and 5 are discussed.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 355-363 
    ISSN: 0009-2940
    Schlagwort(e): Ruthenium clusters ; Phosphorus ylides ; Oxidative addition ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Three-Centre Oxidative Addition of Phosphorus Ylides to Ru3(CO)12Phosphorus ylides undergo oxidative addition to Ru3(CO)12 to yield a wide range of Ru3 clusters with triply bridging organic ligands derived from the ylides. Ph3P=CH2 forms HRu3(CO)9(μ31-Ph3P  -  CH  -  CO) (1) containing a phosphonio enolate. Ph3P=CH  -  CHO yields a product mixture containing the phosphonio enolate-bridged cluster and its PPh3 derivative 6, the phosphoniomethylidyne-bridged compound H2Ru3(CO)9(μ31-C  -  PPh3) (5), and the ketenylidene-bridged compound H2Ru3(CO)8(PPh3)(μ31-C  -  CO) (7). Thermal treatment converts the phosphonio enolate ligand (in 1) into the phosphoniomethylidyne ligand (in 5), and the latter into the ketenylidene ligand (in 7). With Ph3P=CH  -  C(O)Me and Ru3(CO)12 ortho1-metalated Ru3 derivatives 10, 11 of the phosphonio ketone R3P  -  C  -  C(O)Me are produced, and likewise with Ph3P=CH  -  COOEt the ortho1-metalated derivative 12 of the phosphonio ester R3P  -  C  -  CO2Et. Me3P=CH  -  COOtBu is oxidatively added to form HRu3(CO)9(μ31-Me3P  -  C  -  COOtBu) (13) bearing a phosphonio ester ligand.  -  The crystal structures of 6 and 13 are reported. The sequence of Ru3 clusters and the bonding modes of the μ3 ligands can be related to the surface reactions during Fischer-Tropsch catalysis.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    ISSN: 0009-2940
    Schlagwort(e): Dinuclear complexes ; Iron complexes ; Platinum complexes ; Silyl complexes ; Phosphide bridges ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Transition Metal Silyl Complexes, 44.  -  Preparation of the Binuclear Silyl Complexes (CO)3(R3Si)Fe(μ-PR′R′′)Pt(PPh3)2 by Oxidative Addition of (CO)3(R′R′′HP)Fe(H)SiR3 to (C2H4)Pt(PPh3)2The complexes (CO)3(R′R′′HP)Fe(H)SiR3 (1) [PHR′R′′ = PHPh2, PH2Ph, PH2Cy; SiR3 = SiPh3, SiPh2Me, SiPhMe2, Si(OMe)3] react with Pt(C2H4)(PPh3)2 to give the dinuclear, silyl-substituted complexes (CO)3(R3Si)Fe(μ-PR′R′′)Pt(PPh3)2 (2) in high yields. Upon reaction of 2 (R = R′ R′′ = Ph) with CO, the PPh3 ligand at Pt being trans to the PPh2 bridge is exchanged, and (CO)3(Ph3Si)Fe(μ-PPh2)Pt(PPh3)CO (3) is formed. Complex 3 is characterized by an X-ray structure analysis. The rather short Fe  -  Si distance [233.9(2) pm] and the infrared spectrum of 3 indicate that the Fe  -  Pt bond is quite polar.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 933-940 
    ISSN: 0009-2940
    Schlagwort(e): Bis(acyl)1-bridged bimetallic complexes ; Rhenium complexes ; Molybdenum complex ; Ruthenium complex ; Copper complex ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Organometallic Lewis Acids, IL[1]. - Bis(acyl)1-Bridged Heterometallic Complexes of Rhenium, Molybdenum, Ruthenium, and CopperThe reaction of the metalla-β1-diketonate complex [(OC)41-Re[-C(Me)O]2][NMe4] with various organometallic Lewis acids yields the bis(acyl)1-bridged bimetallic complexes (OC)4 -Re[-C(Me)O-]2Re(CO)4 (1), (OC)4Re[-C(Me)O-]2MoCp(CO)2 (2), (OC)4Re[-C(Me)O-]2Ru(η31-C3 H5)(nbd) (nbd=norbor-nadiene) (3), [(OC)4 Re[-C(Me)O-]2Ru(PPh3)2 (CO)2][BF4] (4), and (OC)4 Re[-C(Me)O-]2Cu[-O(Me)C-]2Re(CO)4 (5), respectively. The structures of the compounds 1-5 have been determined by X-ray diffraction. They show different conformations of the six-membered ring Re[-C(Me)O-]2[M]. The molecular structure of complex 1 proves a “flipping” of the acyl ligands.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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