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  • 1
    ISSN: 1572-9125
    Keywords: Parallel sparse LU factorization ; asynchronous computation scheduling ; SMP parallel computing ; multigrid coarse solver ; process simulation ; device simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An efficient sparse LU factorization algorithm on popular shared memory multi-processors is presented. Pipelining parallelism is essential to achieve higher parallel efficiency and it is exploited with a left-right looking algorithm. No global barrier is used and a completely asynchronous scheduling scheme is one central point of the implementation. The algorithm has been successfully tested on SUN Enterprise, DEC AlphaServer, SGI Origin 2000 and Cray T90 and J90 parallel computers, delivering up to 2.3 GFlop/s on an eight processor DEC AlphaServer for medium-size semiconductor device simulations and structural engineering problems.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 47 (1996), S. 299-306 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion monitoring with electrochemical sensors by using evolution-inspired optimization techniquesA complex array of sensors for measurements of corrosion influencing parameters was investigated at the example of pitting corrosion of the alloy X 5 CrNi 18 10. Potentiodynamic measurements of pitting potential were performed in a flow circuit by varying chloride ion concentration (10-3 … 1 mol 1-1), pH-value (2 … 8), content of dissolved oxygen (0 … 8 mg 1-1), temperature (10 … 60°C) and flow velocity (0 … 2 m s-1). The influence of these parameters on the pitting potential was evaluated by using evolution-inspired optimization technique with an equation derived from literature data. This technique is indicated by stable convergence in the present application and results in an empirical equation facilitating the forecast of pitting potential in the investigated parameter field.
    Notes: Eine komplexe Sensorik zur Messung korrosionsbeeinflussender Faktoren wurde am Beispiel der Lochkorrosion des Stahls X 5 CrNi 18 10 untersucht. Potentiodynamische Messungen des Lochfraßpotentials wurden unter Variation der Chloridionenkonzentration (10-3 … 1 mol 1-1), des pH-Wertes (2 … 8), des Gelöstsauerstoffgehaltes (0 … 8 mg 1-1), der Temperatur (10 … 60 °C) und der Strömungsgeschwindigkeit (0 … 2 m s-1) in einem Strömungskreislauf durchgeführt. Der Einfluß dieser Größen auf das Lochfraßpotential wurde mit einer aus Literaturdaten abgeleiteten Gleichung unter Einsatz von Evolutionsstrategien ausgewertet. Die damit gewählte Optimierungsmethode zeichnet sich im vorliegenden Anwendungsfall durch stabile Konvergenz aus und ergibt eine empirische Gleichung, die eine Vorhersage der Größe des Lochfraßpotentials im untersuchten Parameterbereich ermöglicht.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 477 (1981), S. 126-132 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Iron and Nickel Carbonyl Complexes with Substituted Distibane and Antimonido LigandsThe reactions of enneacarbonyldiiron with substituted distibanes yield mononuclear complexes [Fe(CO)4SbR2SbR2] (R = C2H5, t-C4H9), a dinuclear complex [(CO)4FeSbPh2SbPh2Fe(CO)4] and antimonido-bridged compounds [(CO)3Fe(SbR2)2-Fe(CO)3] (R = C2H5, C6H5). Product of the reaction of tetramethyldistibane with tetracarbonylnickel is the binuclear complex [(CO)3NiSbMe2SbMe2Ni(CO)3]. The 1H-n.m.r., i.r., and mass spectra of the new compounds are reported.
    Notes: Bei Reaktionen von Enneacarbonyldieisen mit substituierten Distibanen entstehen die Einkernkomplexe [Fe(CO)4SbR2SbR2] (R = C2H5, t-C4H9), der Zweikernkomplex [(CO)4FeSbPh2SbPh2Fe(CO)4] sowie die antimonido-verbrückten Verbindungen [(CO)3Fe(SbR2)2-Fe(CO)3] (R = C2H5, C6H5). Produkt der Umsetzung von Tetramethyldistiban mit Tetracarbonylnickel ist der Zweikernkomplex [(CO)3NiSbMe2SbMe2Ni(CO)3].Die 1H-NMR-, IR- und Massenspektren der dargestellten Verbindungen werden mitgeteilt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 454 (1979), S. 167-174 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Spectroscopic Investigations of Mono- and Binuclear Metalcarbonyl Complexes of Tetraalkyldistibane and Tetraphenyldistibane LigandsThe reactions of photochemically generated solutions of pentacarbonyl (tetrahydrofurane)chromium and -tungsten with tetramethyldistibane 1, tetraethyldistibane 2, tetra-tert-butyldistibane 3, and tetraphenyldistibane 4 yield mononuclear complexes (OC)5M—SbR2SbR2 (5; M = Cr, W; R = CH3, C2H5, C6H5) and binuclear complexes (OC)5M—SbR2SbR2—M(CO)5 (6; M = Cr, W; R = t-C4H9, C6H5). The chemical and spectroscopic properties of these compounds are discussed.
    Notes: Aus photochemisch erzeugten Lösungen von Pentacarbonyl(tetrahydrofuran)-chrom und -wolfram bilden sich mit Tetramethyldistiban 1, Tetraethyldistiban 2, Tetra-tertbutyldistiban 3 und Tetraphenyldistiban 4 einkernige Komplexe des Typs (OC)5M—SbR2SbR2 (5; M = Cr, W; R = CH3, C2H5, C6H5) sowie zweikernige Komplexe (OC)5M—SbR2SbR2—M(CO)5 (6; M = Cr, W; R = t-C4H9, C6H5). Die chemischen und spektroskopischen Eigenschaften dieser Verbindungen werden diskutiert.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 477 (1981), S. 119-125 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reactions of μ-Distibane- and Di-μ-antimonido-bridged Metalcarbonyl Complexes of Chromium, Molybdenum, and TungstenBy irradiation of hexacarbonylmolybdenum in tetrahydrofuran solutions are produced, which react with tetramethyl-, -ethyl-, and -phenyldistibane to yield the complexes (CO)5MoSbR2SbR2Mo(CO)5, R = Me, Ph and (CO)4Mo(SbR2)2Mo(CO)4, R = Me, Et, Ph.(CO)4W(SbPh2)2W(CO)4 is a product of the thermal reaction of hexacarbonyltungsten and tetraphenyldistibane. Cleavage of (CO)5CrSbMe2SbMe2Cr(CO)5 with bromine yields (CO)5CrSbMe2Br.
    Notes: Durch Bestrahlen von Hexacarbonylmolybdän in Tetrahydrofuran erzeugte Lösungen reagieren mit Tetramethyl-, -ethyl- und -phenyldistiban zu den Komplexen (CO)5MoSbR2SbR2Mo(CO)5, R = Me, Ph und (CO)4Mo(SbR2)2Mo(CO)4, R = Me, Et, Ph.(CO)4W(SbPh2)2W(CO)4 entsteht thermisch aus Hexacarbonylwolfram und Tetraphenyldistiban. Die Spaltung von (CO)5CrSbMe2SbMe2Cr(CO)5 mit Brom ergibt (CO)5CrSbMe2Br.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 445 (1978), S. 5-12 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemical Preparation of Halogeno Pyridine Osmates(IV)By irradiation of [OsCl6]2- or [OsBr6]2- in pyrdine [OsCl5py]- and for the first time [OsBr5py]- are prepared. [OsI6]2- gives preferably mer-[OsI3py3]. The quantum yields are 10-2-10-4 Photolysis of [OsCl5I]2- in pyridine in the range of 366-436 nm gives [OsCl5py]- and the unknown light-sensitive tr.-[OsCl4Ipy]-, separable on ion exchange cellulose. The new compounds are characterized by ligand exchange reactions, electron and i.r. spectra and their solubilities.
    Notes: Durch Bestrahlen von [OsCl6]2- bzw. [OsBr6]2- in Pyridin werden [OsCl5py]- und erstmals [OsBr5py]- dargestellt. Aus [OsJ6]2- bildet sich hauptsächlich mer-[OsJ3py3]. Die Quantenausbeuten liegen zwischen 10-2 und 10-4. Die Photolyse von [OsCl5J]-2 in Pyridin führt im Bereich von 366-436 nm zu [OsCl5py]- und dem bisher nicht bekannten lichtempfindlichen tr.-[OsCl4Jpy]-, die an Celluloseionenaustauschern voneinander getrennt werden. Die neuen Verbindungen werden durch Ligandenaustauschreaktionen, Elektronen- und IR-Spektren sowie durch ihr Löslichkeitsverhalten charakterisiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 445 (1978), S. 215-218 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Binuclear Metal Carbonyl Complexes with Tetraalkyldistibane and Bis(diphenylstibino)-methane LigandsTetramethyldistibane 1, tetraethyldistibane 2 and bis(diphenylstibino)methane 3 react with photochemically generated solutions of pentacarbonyl(tetrahydrofuran)chromium and -tungsten. Thereby the binuclear complexes (Co)5MSbR2SbR2M(CO)5 (M = Cr, W; R = CH3,C2H5) and (CO)5CrSb(C6H5)2CH2Sb(C6H5)2Cr(CO)5 are formed.
    Notes: Tetramethyldistiban 1, Tetraethyldistiban 2 und Bis(diphenylstibino)-methan 3 reagieren mit photochemisch erzeugten Lösungen von Pentacarbonyl(tetrahydrofuran)-chrom und -wolfram zu den Zweikernkomplexen (Co)5MSbR2SbR2M(CO)5 (M = Cr, W; R = CH3,C2H5) sowie (Co)5CrSb(C6H5)2CH2Sb(C6H5)2Cr(CO)5.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 487 (1982), S. 111-118 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Spectra of Tetramethyl-, Tetraethyl-, and TetraphenyldistibaneThe infrared spectra of liquid tetramethyldistibane from 4 000 to 20 cm-1, of liquid tetraethyldistibane and solid tetraphenyldistibane as well as the Raman spectra of liquid Me4Sb2 at 25 to 100° including the depolarisation values of the bands, of solid Me4Sb2 at 0°, of liquid Et4Sb2 and solid Ph4Sb2 are reported. Based on positions, relative intensities and polarisation values of the bands assignments are made, which include proposals for the positions of the Sb—Sb valence frequencies. In the case of Me4Sb2 it is possible to assign two frequencies, in the case of Et4Sb2 and Ph4Sb2 only one frequency to ν Sb—Sb. This corresponds to the presence of gauche and trans conformers in Me4Sb2 and of only one conformer in Et4Sb2 and Ph4Sb2.
    Notes: Die Infrarotspektren von flüssigem Tetramethyldistiban von 4 000 bis 20 cm-1, von flüssigem Tetraethyldistiban und von festem Tetraphenyldistiban von 4 000 bis 200 cm-1 sowie die Ramanspektren von flüssigem Me4Sb2 bei 25 bis 100° mit Angabe des Polarisationsgrades der Banden, von festem Me4Sb2 bei 0°, von flüssigem Et4Sb2 und festem Ph4Sb2 werden mitgeteilt. Aufgrund der Lage, der relativen Intensitäten und des Polarisationsgrades der Banden werden Zuordnungen getroffen, die Vorschläge für die Lage der Sb—Sb-Valenzschwingungen einschließen. Hierfür kommen im Fall von Me4Sb2 zwei, im Fall von Et4Sb2 und Ph4Sb2 nur eine Frequenz in Frage. Dies entspricht dem Vorliegen von gauche- und trans-Konformeren bei Me4Sb2 und nur eines Konformeren bei Et4Sb2 und Ph4Sb2.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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