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  • Inorganic Chemistry  (1,485)
  • Chemical Engineering  (824)
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  • 2015-2019
  • 1975-1979  (3,428)
  • 1979  (1,742)
  • 1978  (1,686)
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  • 2015-2019
  • 1975-1979  (3,428)
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  • 1
    Electronic Resource
    Electronic Resource
    Power consumption and gas capacity of self-inducting turbo aerators (1979)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 763-773 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A theoretical and experimental analysis of self-inducting turbo aerator performance was carried out based on the theory of water jet injector operation. It was shown that the aerator's injection coefficient is completely determined by only two dimensionless groups, CH and EuG, between which there is a single valued dependence on whose basis generalization of experimental data is possible. An analytical expression for the optimality criterion or aerator performance index, accounting for aerator gas capacity, power consumption, and submergence, has been obtained in terms of CH and EuG with only one adjustable parameter. From the above two dependencies, a methodology was developed for determining optimal operating conditions, by means of which all the data necessary for the optimal design can be obtained from the results of bench scale experiment.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690250504
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  • 2
    Electronic Resource
    Electronic Resource
    Über TlPd3O4 und TlPt3O4 - ternäre Platinmetalloxide mit Käfigstruktur (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 443 (1978), S. 11-18 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: TlPd3O4 and TlPt3O4 - Ternary Platinum Metal Oxides with Cluster StructureThe crystal structure of the cardinal red oxide TlPd3O4, prepared by the reaction of Pdo with TlNO3 or Tl2O3 at 550°C, has been determined on powder samples by X-ray and neutron diffraction. The structure of the cubic compound (a = 959.6(2) pm; space group Fm3m; Z = 8) contains square-planar PdO4 units which are joined to a three dimensional skeleton by triply bonding oxygen atoms. The cubic and rhombicuboctahedral spaces are occupied by TlIII and TlI cations so that the compound can be formulated as a mixed valency thallium(III)-thallium(I)-oxopalladate(II). The relationship with the structure of the platinum bronzes is discussed.The analogous ternary platinum oxide TlPt3O4 (a = 966.3(2)pm) has been obtained by thermal decomposition of Tl2Pt2O7.
    Notes: Die Kristallstruktur des durch Umsetzung von Pdo mit TlNO3 bzw. Tl2O3 bei 550°C erhaltenen kardinalroten Oxides TlPd3O4 wurde durch Röntgen-und Neutronenbeugung an Pulverproben aufgeklärt. In der Struktur der kubischen Verbindung (a = 959,6(2) pm; Raumgruppe Fm3m; Z = 8) sind quadratisch planare Pdo4- Baugruppen über dreibindige O- Atome zu einem dreidimensionalen Netz verknüpft. Die würfelförmigen und rhombendodekaedrischen Hohlräume des Gerüstes sind von TlIII-bzw. TlI-Kationen besetzt, so daß die Verbindung als valenzgemischtes Thallium (III)-thallium(I)-oxopalladat(II) formuliert werden kann. Die Verwandtschaftsverhältnisse zu den Strukturen der Platinbronzen werden diskutiert.Das entsprechende Oxoplatinat TlPt3O4 (a = 966,3(2) pm) konnte durch thermische Zersetzung von Tl2Pt2O7 erhalten werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784430102
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  • 3
    Electronic Resource
    Electronic Resource
    Schwingungsspektren fester, flüssiger und gelöster Metallpolysulfide. II. Polysulfide Rb2Sn und Cs2Sn (n ≥ 4) sowie Na2S4Professor HEINRICE HELLMANN zum 65. Geburtstage am 10. Dezember 1978 gewidmet. (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 455 (1979), S. 69-87 
    Details
    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 Solid, Liquid, and Soluted Metal Polysulphides. II Polysulphides Rb2Sn (n ≥ 4) and Na2S4All compounds have been prepared from the elements in liquid ammonia. Whereas Rb2S4 has no defined composition, the vibrational spectra of Cs2S4 and their structure similar to Na2S4 indicate that Cs2S4 is a well-defined compound in contrast to former suggestions. Rb2S5 and Cs2S6 are the members with the greatest chainlength of their homologe series.While Na2S4 still exists of S42- chains in the melt the other polysulhpides disproportionate to S3- radicals and probably monosulphide. In the melt of Cs2S6, quenched to room temperature, a double branched chain structure, the thio-analogue of dithionite, S2S42-, is suggested. All polysulphides have a mean valence frequency, which is independent of the cation and decreases with increasing chainlength.
    Notes: Alle Verbindungen wurden aus den Elementen im flüssigen Ammoniak dargestellt. Während Rb2S4 keine definierte Zusammensetzung aufweist, zeigen die Schwingungsspektren des Cs2S4 sowie deren ähnliche Struktur mit dem Na2S4, daß Cs2S4 entgegen früheren Annahmen als eigenständige Verbindung auftritt. Rb2S5 und Cs2S6 sind die langkettigsten Glieder ihrer homologen Reihe. Während Na2S4 auch in der Schmelze noch aus S42--Ketten besteht, findet für die anderen Polysulfide eine Disproportionierung in S3--Radikale und wahrscheinlich Monosulfid statt. In der auf Zimmertemperatur abgeschreckten Schmelze des Cs2S6 wird eine zweifach verzweigte Kettenstruktur, ein Thioanaloges des Dithionits, S2S42-, angenommen. Bei allen Polysulfiden gibt es eine mittlere Valenzfrequenz, die unabhängig vom Kation mit steigender Kettenlänge absinkt.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794550108
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  • 4
    Electronic Resource
    Electronic Resource
    Cobalthydrogenarsenat-Monohydrat. Darstellung und Kristallstruktur (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 454 (1979), S. 134-144 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cobalt(II) Hydrogenarsenate Monohydrate. Preparation and Crystal StructureCo[H2O|HOAsO3] was prepared by heating of As2O5, CoSO4 · 7 H2O and H2O at 150°C in a sealed tube and investigated by X-rays. The compound crystallizes triclinic, space group P¯1 with a = 786.5, b = 1569.9, c = 671.9 pm, α = 94.25, β = 96.89, γ = 90.28° and Z = 8.The structure contains chains of edge-shared CoO6 octahedra connected by AsO4 tetrahedra forming sheets. Two of such somewhat different sheets built up the whole structure. Based on the charge balance derived from the geometrical data and the IR spectra the occurrence of hydrogen bridges is discussed.
    Notes: Co[H2O|HOAsO3] wurde durch Erhitzen von As2O5, CoSO4 · 7 H2O und H2O auf 150°C im Autoklaven dargestellt und röntgenographisch untersucht. Die Verbindung kristallisiert triklin, Raumgruppe P¯1 mit a = 786,5, b = 1569,9, c = 671,9 pm, α = 94,25, β = 96,89, γ = 90,28° und Z = 8. Die Struktur enthält Ketten aus kantenverknüpften CoO6-Oktaedern, welche über AsO4-Tetraeder zu Schichten verknüpft sind. Zwei solche etwas verschiedenartige Schichten bilden die Gesamtstruktur. Anhand der aus den geometrischen Daten berechneten Ladungsbilanz und der IR-Spektren wird das Auftreten von Wasserstoffbrücken diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794540121
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  • 5
    Electronic Resource
    Electronic Resource
    Kohlenstoff-Markierungsstudien zur α-Oxocarben-Oxiren-Isomerisierung (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 678-688 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbon-Labelling Studies on the α-Oxocarbene-Oxirene IsomerizationThe photochemical Wolff rearrangement of α-diazoketones (1a - g, 3e - g), labelled with 13C or 12C, in dioxane/water yields carboxylic acids containing the label in the carboxy group and the adjacent carbon atom. This proves that the α-oxocarbenes, formed by photolytic elimination of nitrogen, undergo a carbene-carbene rearrangement via oxygen shift (4 ⇌ 5 ⇌ 6). in some cases to an extent of more than 60%, the degree depending upon the substituents and the irradiation wave-length.  -  For examination of the reaction model (scheme 1), both entry pathways (1 → 4, 3 → 6) to the carbene-oxirene-carbene equilibrium are realized by photolysis of the isomeric labelled α-diazoketones le, f, g / 3e, f, g. An alternative mechanism, whereby the scrambling of the carbon label takes place at the ketene stage, can be excluded.
    Notes: Die photochemische Wolff-Umlagerung der 13C- bzw. l2C-markierten α-Diazoketone (1a-g. 3e-g) in Dioxan/Wasser (13:2) führt zu Carbonsäuren, in denen die Markierung in die Carboxygruppe und das benachbarte Kohlenstoff-Atom eingeht. Dadurch wird belegt, Daß die durch photolytische N2-Eliminierung gebildeten α-Oxocarbene einer Carben-Carben-Umlagerung durch Sauerstoff-Verschiebung unterliegen (4 ⇌ 5 ⇌ 6), die je nach Substituenten und Wellenlänge des Lichtes mehr als 60% ausmachen kann.  -  Zur Untersuchung des Reaktionsmodells (Schema 1) werden beide Zugänge (1 → 4 und 3 → 6) zum Carben-Oxiren-Carben-Gleichgewicht durch Photolyse isomerer, markierter α-Diazoketone (1 e, f, g/3e, f, g) beschritten. Ein alternativer Mechanismus, der die Isotopenverteilung auf der Ketenstufe vorsieht. kann ausgeschlossen werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120229
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  • 6
    Electronic Resource
    Electronic Resource
    Neue 1,3,2,4-Diazadiphosphetidine (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1180-1194 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New 1,3,2,4-DiazadiphosphetidinesThe 1,3,2,4-diazadiphosphetidines 5a-f are easily prepared by the reaction of chlorobis(dialkylamino)phosphanes with sodium bis(trimethylsilyl)amide. Further oxidation reactions by O2, S8, N3Si(CH3)3, and alkyl halides are tested in detail in the case of 5a. As shown by NMR spectroscopy, 5a-f are obtained from synthesis almost exclusively as cis isomers which on thermal treatment form a mixture of cis and trans isomers. Methoiodide adducts 9a-f show this isomerisation as well.
    Notes: Die Reaktion von Chlorbis(dialkylamino)phosphanen mit Natrium-bis(trimethylsilyl)amid eröffnet einen bequemen Weg zu den 1,3,2,4-Diazadiphosphetidinen 5a-f, deren Erst- und Zweitoxidation durch O2,S8, N3Si(CH3)3 und Alkylhalogenide am Beispiel von 5a ausführlicher untersucht wird. 5a-f fallen bei der Darstellung fast ausschließlich als cis-Isomere an, die thermische Behandlung führt  -  wie NMR-spektroskopisch gezeigt wird  -  zu einem cis-trans-Isomerengemisch. Auch die Methoiodide 9a-f zeigen cis-trans-Isomerisierung.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110336
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  • 7
    Electronic Resource
    Electronic Resource
    1,2,7-Azadiphosphepine  -  neue Phosphor und Stickstoff enthaltende Heterocyclen (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1655-1658 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,2,7-Azadiphosphepines  -  New Phosphorus and Nitrogen Containing Heterocycles1 reacts with 2 moles of 2 to give the bicyclic compound 3 containing the new 1,2,7-azadiphosphepine ring system. Diphosphinoamines 5 can be considered as three-membered segments of the eight-membered ring system 1. Thus the amines 5 react with 2 likewise to give monocyclic 1,2,7-azadiphosphepines 6.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110448
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  • 8
    Electronic Resource
    Electronic Resource
    Stoffwechselprodukte von Mikroorganismen, 172. Isolierung des Antibioticums semi-Vioxanthin aus Penicillium citreo-viride und Synthese des Xanthomegnins (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 957-978 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolic Products of Microorganism, 172. Isolation of the Antibiotic semi-Vioxanthin from Penicillium citreo-viride and Synthesis of XanthomegninBesides xanthomegnin (16 b), 3,4-dehydroxanthomegnin (29a), viomellein (23) and vioxanthin (3) from Penicillium citreo-viride under different culture conditions semi-vioxanthin (7) was isolated. Structure 7 has been established by its spectra and the fact that oxidation with Fremy's salt gives 3,4,6,9-tetrahydro-10-hydroxy-7-methoxy-3-methyl-1,6,9-trioxo-1H-naphtho[2,3-c]pyran (9a = semi-xanthomegnin). -9c, prepared by demethylation of 9a, was dimerized by potassium peroxydisulfate/sodium hydroxide and methylated, giving 16b. Synthetic 16b and authentic xanthomegnin were identical, which verifies the structure revised by Höfle and Röser9) and shows, that the dyes of the xanthomegnin series are biogenetically homogenous. - The metabolic products of the strain inhibit the growth of bacteria. 16b and 26 furthermore have an effect against insects.
    Notes: Neben Xanthomegnin (16b), 3,4-Dehydroxanthomegnin (29 a), Viomellein (23) und Vioxanthin (3) wurde aus Penicillium citreo-viride unter veränderten Kulturbedingungen semi-Vioxanthin (7) isoliert. Konstitution 7 folgt aus den Spektren und dem Befund, daß mit Fremy-Salz 3,4,6,9-Tetrahydro-10-hydroxy-7-methoxy-3-methyl-1,6,9-trioxo-1H-naphtho[2.3-c]pyran (9a = semi-Xanthomegnin) entsteht. - Das durch Entmethylierung von 9a zugängliche 9c ließ sich mit Kaliumpersulfat/Natriumhydroxid zu 16a dimerisieren, das zu 16b methyliert wurde. Synthetisches 16b war mit nativem Xanthomegnin identisch, was die von Höfle und Röser9) revidierte Konstitution bestätigt und beweist, daß die Farbstoffe der Xanthomegnin-Reihe biogenetisch einheitlich sind. - Die Stoffwechselprodukte des Stammes hemmen das Wachstum von Bakterien, 16b und 23 wirken ferner gegen Insekten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120319
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  • 9
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie der Thiazylhalogenide. 8. Ein neuer Typ von Thiazylhalogeniden als Zwischenprodukt der Halogenierung von Schwefeltetranitrid (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 448 (1979), S. 5-10 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Thiazylhalides. 8. A New Type of Thiazylhalides as an Intermediate of the Halogenation of Sulfur TetranitrideThe preparation of new thiazylhalides of the formula N4S4X2 (X = F, Cl) is reported in this paper. The chloride is a product of the chlorination of sulfur tetranitride, the fluoride was prepared by the reaction of N4S4Cl2 with sodium fluoride. The compounds were characterized by i.r., Raman, and mass spectra. Both tetrathiazyldihalides represent primary intermediates of the fluorination and chlorination of S4N4. The different results of both reactions are explained by differences in the chemical behaviour of the dihalides.
    Notes: Es wird über die Darstellung neuer Thiazylhalogenide der Zusammensetzung N4S4X2 (X = F, Cl) berichtet. Das Chlorid wurde bei der Chlorierung des Schwefeltetranitrides unter geeigneten Bedingungen gewonnen. Das Fluorid wurde aus dem Chlorid durch die Reaktion mit NaF dargestellt. Die Verbindungen wurden auf Grund von IR-, Raman- und Massenspektren charakterisiert. Beide Tetrathiazyldihalogenide stellen primäre Zwischenprodukte bei der Halogenierung von S4N4 dar. Der Unterschied in der Endstufe der Fluorierung und Chlorierung wird durch Unterschiede im chemischen Verhalten der Dihalogenide erklärt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794480101
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  • 10
    Electronic Resource
    Electronic Resource
    An instability leading to failure of polyethylene in uniaxial creep (1979)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 19 (1979), S. 104-107 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Based on a continuum model, a point of instability is predicted for the uniaxial creep of high density polyethylene. From dead load experiments it has been found that the instability occurs for linear polyethylene at around 10-12 percent strain, depending upon molecular weight and molecular weight distribution. It is shown that in the range of applied stresses for which the specimens neck during uniaxial creep, the time required to reach the critical point is related by a constant factor to the time at which the neck appears. A synopsis of theoretical considerations, as well as experimental work in support of this idea, is given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760190209
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