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  • 1990-1994  (7)
  • 1980-1984
  • 1991  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Expression of three recombinant proteins using baculovirus vectors in 23 insect cell lines (1991)
    s.l. : American Chemical Society
    Biotechnology progress 7 (1991), S. 9-14 
    Details
    ISSN: 1520-6033
    Source: ACS Legacy Archives
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bp00007a002
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The approximate Dirichlet Domain Decomposition method. Part I: An algebraic approach (1991)
    Springer
    Computing 47 (1991), S. 137-151 
    Details
    ISSN: 1436-5057
    Keywords: AMS(MOS) 65N20 ; 65F10 ; 68A20 ; CR: G.1.3 ; G.1.8 ; Elliptic problems ; finite elements ; substructuring ; domain decomposition ; preconditioners ; parallel algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung In der vorliegenden Arbeit wird ein neuer Zugang zur Konstruktion von Vorkonditionierungsoperatoren auf der Basis von Gebietsdekompositionstechniken (DD Techniken) beschrieben. Anwendungen finden diese DD Vorkonditionierungen im Verfahren der konjugierten Gradienten zur iterativen Lösung von symmetrischen und positiv definiten Finiten-Elemente Gleichungen. Die DD Technik basiert auf einer Zerlegung des Gebietes Ω inp sich nicht überlappende Teilgebiete, die später denp Prozessoren eines MIMD Rechners zugeordnet sind. Die DD Vorkonditionierung enthält drei Blockmatrizen, die für ein konkretes Anwendungsproblem jeweils zu spezifizieren sind. Eine dieser Matrizen wird genutzt, um die Knotenbasis in eine näherungsweise diskret harmonische Basis zu transformieren. Die anderen beiden Matrizen können als Blockvorkonditionierungen für die in jedem Teilgebiet entstehenden Dirichlet-Probleme und für ein modifiziertes Schurkomplement auf den Knoten der Koppelränder zwischen den Teilgebieten interpretiert werden. Die relative spektrale Konditionszahl wird abgeschätzt. Eine direkte Verbindung der vorgeschlagenen DD Vorkonditionierung zu einer Additiven Schwarzschen Methode kann gezeigt werden. Im zweiten Teil dieser Artikelserie werden die Resultate dieser Arbeit auf ebene, symmetrische Randwertprobleme für partielle Differentialgleichungen zweiter Ordnung angewandt und die numerischen Resultate, die auf einem Transputer-Hypercube erzeugt wurden, diskutiert.
    Notes: Abstract We present a new approach to the construction of Domain Decomposition (DD) preconditioners for the conjugate gradient method applied to the solution of symmetric and positive definite finite element equations. The DD technique is based on a non-overlapping decomposition of the domain Ω intop subdomains connected later with thep processors of a MIMD computer. The DD preconditioner derived contains three block matrices which must be specified for the specific problem considered. One of the matrices is used for the transformation of the nodal finite element basis into the approximate discrete harmonic basis. The other two matrices are block preconditioners for the Dirichlet problems arising on the subdomains and for a modified Schur complement defined over all nodes on the coupling boundaries between the subdomains. The relative spectral condition number is estimated. Relations to the additive Schwarz method are discussed. In the second part of this paper, we will apply the results of this paper to two-dimensional, symmetric, second-order, elliptic boundary value problems and present numerical results performed on a transputer-network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02253431
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The approximate Dirichlet Domain Decomposition method. Part II: Applications to 2nd-order Elliptic B.V.P.s (1991)
    Springer
    Computing 47 (1991), S. 153-167 
    Details
    ISSN: 1436-5057
    Keywords: AMS (MOS) 65N20 ; 65F10 ; 68A20 ; CR: G. 1.3 ; G.1.8 ; Elliptic Problems ; finite elements ; substructuring ; domain decomposition ; preconditioners ; parallel algorithms ; hierarchical bases ; multigrid techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Im ersten Teil dieser Artikelserie haben wir auf Basis von Gebietsdekompositionstechniken (DD Techniken) Vorkonditionierungsoperatoren konstruiert. Diese DD Vorkonditionierungen enthalten drei Blockmatrizen, die für spezifische Anwendungsfälle zu konkretisieren sind. In der vorliegenden Arbeit betrachten wir Finite-Elemente-Gleichungen, die bei der DD Diskretisierung von ebenen, symmetrischen, elliptischen Randwertproblemen für partielle Differentialgleichungen zweiter Ordnung entstehen. Zur Definition der oben genannten Blockmatrizen werden Mehrgitter-und hierarchische Techniken herangezogen. Die entstehenden DD-PCCCG Verfahren sind bezüglich des arithmetischen Aufwands asymptotisch fast optimal und bestens zur Parallelrechnung auf MIMD-Computern mit lokalem Speicher und Botschaftenaustausch geeignet. Die auf einem Transputer-Hypercube durchgeführten numerischen Experimente belegen nachhaltig die Effektivität der vorgeschlagenen DD Vorkonditionierungen.
    Notes: Abstract In the first part of this article series, we had derived Domain Decomposition (DD) preconditioners containing three block matrices which must be specified for specific applications. In the present paper, we consider finite element equations arising from the DD discretization of plane, symmetric, 2nd-order, elliptic b.v.p.s and specify the matrices involved in the preconditioner via multigrid and hierarchical techniques. The resulting DD-PCCG methods are asymptotically almost optimal with respect to the operation count and well suited for parallel computations on MIMD computers with local memory and message passing. The numerical experiments performed on a transputer hypercube confirm the efficiency of the DD preconditioners proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02253432
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Hybridisation and crystal field in YbPd2Si2 (1991)
    Springer
    The European physical journal 82 (1991), S. 267-274 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental data in the hybridized compound YbPd2Si2 is compared with the results obtained with a recently proposed hybridisation model, based on the “large-degeneracy expansion” approximation, which takes into account the crystal field splittings of the rare earth ion energy levels. With a unique set of parameters, satisfactory agreement is simultaneously obtained for the thermal variation of the electronic specific heat, of the magnetic susceptibility and of the electric field gradient at the Yb site, as well as for the field variation of the low temperature magnetisation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01324336
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  • 5
    Electronic Resource
    Electronic Resource
    Kondo behaviour in magnetic (Ce−La)Pd2Si2 (1991)
    Springer
    The European physical journal 83 (1991), S. 207-211 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Susceptibility, specific heat and resistivity studies on CePd2Si2 and its pseudoternary system CexLa1−xPd2Si2 are reported. Replacement of Ce by La leads to a near dilution like decrease of the Néel temperaturesT N (x): long range magnetic order in the ground state doublet exists in the wholex range explored (0.2≦x≦1). The present data indicate a concomitant Kondo effect, with Kondo temperaturesT K decreasing linearly from 9 to 3 K, competing with the magnetic interaction. A close relationship between the value of the specific heat jump atT N and the ratio between the two characteristic temperaturesT N andT K is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309419
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Amino acid conjugates as metabolites of the plant growth regulator dihydrojasmonic acid in barley (Hordeum vulgare) (1991)
    Springer
    Journal of plant growth regulation 10 (1991), S. 17-25 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The biotransformation of [2-14C](±)9, 10-dihydrojasmonic acid (DJA) was studied in excised shoots of 6-day-old barley seedlings after 72 h. From the ethyl acetate extract, some minor metabolites were isolated and purified by DEAE-Sephadex A-25 chromatography, thin-layer chromatography (TLC), C18-cartridges, and high-performance liquid chromatography (HPLC). The structural identification of these metabolites was performed by gas chromatography-mass spectrometry (GC-MS), circular dichroism (CD), and amino acid analysis, and the following amino acid conjugates were found:N-[(−)9,10-dihydrojasmonoyl]valine,N-[(−)9,10-dihydrojasmonoyl]isoleucine,N-[9,10-dihydrojasmonoyl]leucine,N-[11-hydroxy-9,10-dihydrojasmonoyl]valine,N-[11-hydroxy-9,10-dihydrojasmonoyl]isoleucine,N-[12-hydroxy-9,10-dihydrojasmonoyl]isoleucine; and the cucurbic acid-related compoundsN-{[3-hydroxy-2(4-hydroxypentyl)-cyclopent-1-yl]-acetyl}isoleucine andN-{[3-hydroxy-2(5-hydroxypentyl)-cyclopent-1-yl]-acetyl}isoleucine. The results suggest conjugation with isoleucine and valine, as well as preferential hydroxylation at position C-11 or hydrogenation at position C-6, as being important steps in the metabolism of (±)DJA in barley shoots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279306
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  • 7
    Electronic Resource
    Electronic Resource
    Comparison of amperometric and UV-spectrophotometric monitoring in the HPLC analysis of pesticides (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 339 (1991), S. 207-211 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Studies have been carried out to compare different detection techniques including amperometric detection in the reductive and oxidative mode and UV detection following the HPLC separation of pesticides. By the example of 4,6-dinitro-o-cresol (DNOC), 2-sec-butyl-4,6-dinitrophenol (Dinoseb) and 2-tert-butyl-4,6-dinitrophenol (Dinoterb), it is shown that the electrochemical detection exhibits higher sensitivities than the UV-technique. The detection limits are in case of the oxidative amperometric technique 0.1 ng for all pesticides, in the reductive mode 0.3 ng for DNOC and 1 ng for Dinoseb and Dinoterb. By UV-monitoring the detection limits were found to be 2 ng for DNOC and 24 ng for Dinoseb and Dinoterb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325738
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    Paper (German National Licenses)
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