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  • Springer  (75)
  • American Geophysical Union (AGU)
  • Hindawi
  • 1995-1999  (76)
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  • 1
    Electronic Resource
    Electronic Resource
    [N(PPh3)2]2[{Au3Ag2(C2Ph)6} {Au3Cu2(Cu2Ph)6}]: Co-crystallized pentanuclear bimetallic gold-silver and gold-copper clusters (1996)
    Springer
    Journal of cluster science 7 (1996), S. 167-177 
    Details
    ISSN: 1572-8862
    Keywords: Gold-silver-copper ; pen tall uclear ; bemtallic ; cluster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The X-ray structural study of the reaction product of equimolar amounts of [Au3Cu2(C2Ph)6]. [{Au(C2Ph)} n ], and [Ag(C2Ph)} n ] revealed two bimetallic anionic [N(PPh3)2] + [Au3Ag2(C2Ph)6]− and [N(PPh3)2]+[Au3Cu2 (C2 Pg)6] — clusters co-crystallized in one asymmetric unit. Each cluster has trigonal bipyramidal geometry with three gold atoms occupying equatorial planes and two silver or copper atoms in the apical positions. Our earlier conclusion based upon spectroscopic characterization describing the product of be above reaction as trimetallic cluster containing three coinage-metals with an overall composition [Au3CuAg(C2Ph)6]−, was erroneous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01166055
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  • 2
    Electronic Resource
    Electronic Resource
    A parametric multistate model for the analysis of carcinogenicity experiments (1995)
    Springer
    Lifetime data analysis 1 (1995), S. 327-346 
    Details
    ISSN: 1572-9249
    Keywords: Weibull distribution ; Survival analysis ; Animal toxicology ; Peto test ; Markov models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A fully parametric multistate model is explored for the analysis of animal carcinogenicity experiments in which the time of tumour onset is not known. This model does not require assumptions about tumour lethality or cause of death judgements and can be fitted in the absence of sacrifice data. The model is constructed as a three-state model with simple parametric forms for the transition rates. Maximum likelihood methods are used to estimate the transition rates and different treatment groups are compared using likelihood ratio tests. Selection of an appropriate model and methods to assess the fit of the model are illustrated with data from animal experiments. Comparisons with standard methods are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985448
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  • 3
    Electronic Resource
    Electronic Resource
    Recovery of Residual Lubricating Oil from Waste Clay by Flotation (1998)
    Springer
    Monatshefte für Chemie 129 (1998), S. 387-392 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Petroleum waste clay; Pollution; Flotation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Der bei der Raffination von Schmierölrücksständen anfallende Abfallschlamm enthält etwa 30%Öl. Die selektive Abtrennung des Öls durch Flotation unter Verwendung von linearen Bariumalkylbenzolsulfonaten als Flotationshilfsmittel und dessen Verhalten an der Lösungs-Luft-Grenzfläche wurden im Labor untersucht, und die Parameter CMC (Kritische Micellenkonzentration), Π (Effizienz) und P c20 (Effektivität) wurden bestimmt. Die Einflüsse von Konzentration des Flotationshilfsmittels und der Reihenfolge der Zugabe der Reagenzien werden diskutiert. Die Grenzflächenespannung zwischen Flüssigkeit und Dampfraum wurde mit Methanol eingestellt; die dadurch erreichte Selektivität läßt sich in Abhängigkeit von kritischer Oberflächenspannung und CMC erklären. Zusätzlich wurden die physikochemischen Eigenschaften des unter optimalen Bedingungen wiedergewonnenen Öls bestimmt.
    Notes: Summary.  The waste clay produced from refining waste lubricating oil contains about 30% oil. Laboratory research has been carried out on the selective separation of oil by flotation using linear barium alkyl benzene sulfonates as a collector. The behaviour of this collector at the solution-air interface is studied; the critical micelle concentration (CMC), efficiency (Π), and effectiveness (P c20) of the collector are determined. The effects of collector concentration and addition mode are investigated. The liquid-vapour interfacial tension was controlled by methanol. The selectivity achieved by the use of methanol is explained in terms of critical surface tension of floatability and CMC. In addition the physico-chemical characteristics of the recovered oil at optimum conditions are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000095
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  • 4
    Electronic Resource
    Electronic Resource
    Chelation behaviour of lanthanides with somethio-Schiff bases (1995)
    Springer
    Monatshefte für Chemie 126 (1995), S. 163-171 
    Details
    ISSN: 1434-4475
    Keywords: Stability constants ; Lanthanides ; Potentiometry ; Conductometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Stabilitätskonstanten von Komplexen trivalenter Y-, La-, Ce-, Pr-, Sm-, Gd-, Dy-, Ho-, Er- und Yb-Ionen mit einigenthio-Schiffschen Basen wurden potentiometrisch unter Verwendung der vonIrving undRossotti modifiziertenCalvin-Bjerrum-Titrationstechnik bei 25 °C undI=0.1M (NaCl) in 70% (v/v) wäßrigem Ethanol bestimmt. Wie konduktometrisch gezeigt werden konnte, treten 1:1- und 1:2-Komplexe auf. DiepK a -Werte der SH-Gruppen wurden mit denHammetschen Substituentenkonstanten korreliert, die Stabilitätskonstanten mit den Kernladungszahlen der Lanthaniden und mit der Summe der Ionisationskonstanten der Liganden.
    Notes: Summary The stability constants of complexes of trivalent Y, La, Ce, Pr, Sm, Gd, Dy, Ho, Er, and Yb ions with somethio-Schiff bases have been determined potentiometrically using theCalvin-Bjerrum titration technique as modified byIrving andRossotti at 25 °C and an ionic strength of 0.1M (NaCl) in 70% (v/v) aqueous ethanol. 1:1 and 1:2 complexes are formed and evidenced by conductometric studies. ThepK a values of the SH group were correlated with theHammet constants of substituents. The values of the stability constants are correlated with the atomic numbers of the lanthanides and with the sum of the ionization constants of the ligands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00812245
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  • 5
    Electronic Resource
    Electronic Resource
    The (E)/(Z)-ratio in the reaction of 5-(2-aryl-2-oxoethyl)-2-thioxo-4-oxo-1,3-thiazolidines with bromine (1995)
    Springer
    Monatshefte für Chemie 126 (1995), S. 439-446 
    Details
    ISSN: 1434-4475
    Keywords: (E)- and (Z)-3-Aryl-, 3-Benzyl-, and 3H-5-Aroylmethylene-2-thioxo-4-oxo-1,3-thiazolidines ; (E)- and (Z)-5-Aroylmethylene-2,4-dioxo-1,3-thiazolidines ; Bromine ; Configurational assignment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung 3-Aryl-, 3-Benzyl- und 3H-5-(2-Aryl-2-oxoethyl)-2-thioxo-4-oxo-1,3-thiazolidine3a–h reagieren mit Brom in essigsaurer Lösung zu Gemischen der entsprechenden diastereomeren 5-Arylmethylen-Derivate ((E) und (Z))5 und6. Sie enthalten mehr als 85% des (E)-Diastereomeren. Die intermediäre Natur der 5-Brom-Derivate4 wird bewiesen; ein Reaktionsweg wird vorgeschlagen. Die Strukturen der Verbindungen3–6 werden durch analytische und spektroskopische Daten abgesichert.
    Notes: Summary 3-Aryl-, 3-benzyl-, and 3H-5-(2-aryl-2-oxoethyl)-2-thioxo-4-oxo-1,3-thiazolidines3a–h react with bromine in acetic acid solution to give mixtures of the respective 5-aroylmethylene (E) and (Z) diastereomeric derivatives5 and6. They contain more than 85% of the (E)-diastereomers along with some pure isomers. The intermediacy of the 5-bromo derivatives4 is proven and a plausible route of the reaction is presented. Structures of compounds3–6 are evidenced by analytical and spectral data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00813206
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  • 6
    Electronic Resource
    Electronic Resource
    Wheat straw and cellulolytic fungi application increases nodulation, nodule efficiency and growth of fenugreek (Trigonella foenum-graceum L.) grown in saline soil (1997)
    Springer
    Biology and fertility of soils 26 (1997), S. 58-65 
    Details
    ISSN: 1432-0789
    Keywords: Key words Acetylene reduction assay ; Cellulolytic fungi ; Diazotrophic bacteria ; Nodulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This study was performed to evaluate the ability of cellulolytic fungi and wheat straw incorporation to improve the nodulation, growth and nitrogen status of fenugreek grown in saline soils. NaCl addition to the growth medium at rates of 0.5 and 1% strongly decreased the enzymatic activity of the ten tested moulds. Three of these fungi, Aspergillus niger, Chaetomium globosum and Trichoderma harzianum, showed the highest enzymatic activity. The three moulds have the ability to degrade straw in the presence of NaCl and T. harzianum was the best straw degrader. Inoculating the plants with Rhizobium meliloti strain TAL1373 and cellulolytic fungi slightly promoted nodulation, growth and nitrogen accumulation when plants were grown with the addition of 0.5% NaCl when compared to plants inoculated with R. meliloti alone. However, application of wheat straw with cellulolytic fungi significantly enhanced growth, nodulation and nodule efficiency at 0.5 and 1.0% salinity. The greatest values of nodulation and growth parameters were obtained with a straw-Trichoderma harzianum combination. Cellulolytic fungi and wheat straw increased the concentration of Ca, Mg and K in the shoots and roots of plants. The increase in dry matter production and N content was mainly due to improved N2 fixation reflected by enhanced formation and growth of nodules as well as nitrogenase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050343
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  • 7
    Electronic Resource
    Electronic Resource
    A bijection which implies Melzer's polynomial identities: theχ 1,1 (p,p+1) case (1996)
    Springer
    Letters in mathematical physics 36 (1996), S. 145-155 
    Details
    ISSN: 1573-0530
    Keywords: 05A19 ; 05A30 ; 11B65 ; Melzer's polynomial identities ; paths and partitions ; Ferrers graphs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We obtain a bijection between certain lattice paths and partitions. This implies a proof of polynomial identities conjectured by Melzer. In a limit, these identities reduce to Rogers-Ramanujantype identities for theχ 1,1 (p,p+1) (q) Virasoro characters, conjectured by the Stony Brook group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00714377
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  • 8
    Electronic Resource
    Electronic Resource
    RSOS Models and Jantzen–Seitz Representations of Hecke Algebras at Roots of Unity (1998)
    Springer
    Letters in mathematical physics 43 (1998), S. 31-42 
    Details
    ISSN: 1573-0530
    Keywords: restricted solid-on-solid models ; Heche algebras ; Jantzen – Seitz modules ; Symmetric groups.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A special family of partitions occurs in two apparently unrelated contexts: the evaluation of one-dimensional configuration sums of certain RSOS models, and the modular representation theory of symmetric groups or their Hecke algebras Hm. We provide an explanation of this coincidence by showing how the irreducible Hm-modules which remain irreducible under restriction to Hm_1 (Jantzen–Seitz modules) can be determined from the decomposition of a tensor product of representations sln.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007316705535
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  • 9
    Electronic Resource
    Electronic Resource
    Introduction to octionion and other non-associative algebras in physics (1997)
    Springer
    Journal of statistical physics 87 (1997), S. 965-966 
    Details
    ISSN: 1572-9613
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181262
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  • 10
    Electronic Resource
    Electronic Resource
    Propagation of electron bursts in the low-latitude magnetosphere (1997)
    Springer
    Czechoslovak journal of physics 47 (1997), S. 337-350 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The APEX project (Active Plasma Experiment) has been launched into a polar orbit in December 1991 and consists of two satellites (IK-25 and MAGION-3), with a distance from ≍ 200 km to 10 000 km between them. The paper deals with short intensive bursts of field-aligned electrons observed during the APEX mission on board the MAGION-3 satellite. These events are predominantly located at the middle geomagnetic latitudes in the day-side magnetosphere. The time–energy structure of these electron bursts is similar to the inverted-V one but the pitch–angle width is less than 10°. Electrons with an energy up to 700 keV are often observed during the events. We analyse the observed events, discuss the possible mechanisms of the particle spreading and the role of the activity of the main satellite as a possible source of these events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022855900991
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