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  • 1
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Autosomal recessive severe congenital neutropenia (SCN) constitutes a primary immunodeficiency syndrome associated with increased apoptosis in myeloid cells, yet the underlying genetic defect remains unknown. Using a positional cloning approach and candidate gene evaluation, we identified a ...
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2018-12-01
    Description: This paper describes a novel method of coupling the atomization and spray combustion processes encountered in coaxial injection elements of liquid rocket engine thrust chambers. This method is based on the Jet-Embedding technique in which the liquid jet core equations and the gas phase equations are solved separately. The liquid and gas phase solutions, however, are coupled through the boundary conditions at the interface between the phases. The computational grid for the gas phase calculations are adapted to the shape of the liquid jet core. The axial variation of droplet sizes are calculated using a stability analysis appropriate for the atomization regime of liquid jet breakup. The predictions of this method have been validated with experimental data on low speed water jets. Using this method, calculations are performed for the SSME fuel preburner single injector flow field. The results obtained are in good agreement with the predictions of the volume-of-fluid method.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 92-3768
    Format: text
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  • 3
    Publication Date: 2013-08-31
    Description: A family of user-friendly, DOS PC based, Microsoft BASIC programs written to provide spacecraft designers with empirical predictions of space debris damage to orbiting spacecraft are described. Spacecraft wall temperatures and condensate formation is also predicted. The spacecraft wall configuration is assumed to consist of multilayered insulation (MLI) placed between a Whipple style bumper and the pressure wall. Impact damage predictions are based on data sets of experimental results obtained from simulating debris impacts on spacecraft using light gas guns on earth. A module of the program facilitates the creation of the database of experimental results that is used by the damage prediction modules to predict damage to the bumper, the MLI, and the pressure wall. A finite difference technique is used to predict temperature distributions in the pressure wall, the MLI, and the bumper. Condensate layer thickness is predicted for the case where the pressure wall temperature drops below the dew point temperature of the spacecraft atmosphere.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NAS 1.26:184245 , NASA-CR-184245
    Format: application/pdf
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  • 4
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The synthesis conditions and oxygen stoichiometry were determined using a thermogravimetric analyser. The kinetics of oxygenation at different temperatures and at different atmospheres were studied. The oxygenation kinetics were found to be sensitive to porosity of the material. The appropriate oxygenation temperature was found to be 400 °C. For oxygenation temperatures below 400 °C, the oxygenation occurs by a nucleation and growth process, whereas for higher temperatures it is diffusion limited.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1435-232X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Charakterisierung eines neuen Thallium(I)- uranates, Tl4UO5Ein neues Thallium(I)-uranat(VI), Tl4UO5, wurde dargestellt und durch Röntgen-, IR- und chemische Analyse charakterisiert. Beim Erhitzen auf 230°C dissoziiert die Verbindung in Tl2O und Tl2UO4, und das weitere thermische Verhalten ist gekennzeichnet von der Flüchtigkeit und Oxydationscharakteristik des freigesetzten Tl2O.
    Notes: A new thallium(I) uranate(VI) of composition Tl4UO5 was isolated and characterised by X-ray, i. r. and chemical analyses. The compound dissociated into thallium(I) oxide and Tl2UO4 on heating to 230°C and its subsequent thermal behaviour depended on the volatilisation and oxidation characteristics of the thallium(I) oxide released.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 211-217 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thallium(I)-uranate(VI)Die Darstellung (durch Festkörperreaktion), die thermischen und die hydrolytischen Eigenschaften der Thallium(I)-uranate(VI) werden beschrieben. Als Phasen wurden identifiziert: Tl2UO4, Tl2U2O7 und ein Gebiet fester Lösungen (Tl2O. 2,33 UO3—Tl2O. 6 UO3). Die Thalliumuranate haben gleiche Strukturen wie die entsprechenden Kaliumuranate. Tl2U2O7 ist die stabile Phase, die sich auch bei der Hydrolyse anderer Uranate bildet. Beim Erhitzen der Uranate über 750°C verflüchtigt sich Tl2O; die Reihenfolge der thermischen Stabilität ist: Tl2U6O19∼Tl2U3O10∼Tl2U2O7»Tl2UO4.
    Notes: The solid state preparation, thermal and hydrolytic characteristics of thallium(I) - uranates(VI) are described. The phases identified were Tl2UO4, Tl2U2O7 and a range of solid solution (Tl2O. 2,33 UO3—Tl2O. 6 UO3). The thallium uranates are isostructural with the corresponding potassium uranates. Tl2U2O7 is the stable phase formed from the other uranates on hydrolytic treatment. The thallium uranates lose thallium(I) oxide on heating to temperatures above 750°C and the order of thermal stability is Tl2U6O19∼Tl2U3O10∼Tl2U2O7»Tl2UO4.
    Additional Material: 2 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 446 (1978), S. 246-250 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thallium (I)-uranat(V)Die Reduktion von Thallium(I)-uranaten(VI) führst stets nur zu einem einzigen Thallium(I)-uranat(V), nämlich T1UO3. Im Gegensatz zu KUO3 Pyrochlorstruktur. Seine physikalischen und chemischen Eigenschaften werden beschrieben.
    Notes: Reduction of thallium(I) uranates(VI) by diverse methods led to formation of only one thallium(I) uranate(V), namely, T1UO3. T1UO3 unlike KUO3 exhibits the pyrochlore structure. Its physical and chemical characteristics were examined and rationalised.
    Additional Material: 1 Ill.
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  • 9
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a étudié par TG et ATD les caractéristiques de la décomposition thermique du perchlorate de thallium(I) dans l'azote et dans l'air. Des études isothermes à 380, 400, 420 et 440°C dans l'air et dans l'azote ont montré que les taux relatifs de produits de décomposition, c'est-à-dire l'oxyde de thallium(III) et le chlorure de thallium(I), dépendent de la température ainsi que de l'atmosphère autour de l'échantillon. Sous faible pression (5 · 10−1 torr) le perchlorure de thallium(I) se volatilise même à 200°.
    Abstract: Zusammenfassung Die thermischen Zersetzungscharakteristika von Thallium(I)-perchlorate wurden in Stickstoff und in Luft unter Anwendung der TG- und DTA-Techniken untersucht. Isotherme Studien bei 380°, 400°, 420° und 440° in Luft und in Stickstoff zeigten, daß die relativen Mengen der Zersetzungsprodukte, Thallium(III)oxid und Thallium(I) Chlorid, sowohl von der Temperatur als auch von der das Muster umgebenden Atmosphäre abhängen. Bei niedrigen Drücken (5×10−1 mm/Hg) verflüchtigt sich Thallium(I)perchlorat bei 200°.
    Notes: Abstract Thermal decomposition characteristics of thallous perchlorate are investigated in nitrogen and in air using TG and DTA techniques. Isothermal studies at 380°, 400°, 420° and 440° in air and in nitrogen showed that the relative amounts of the decomposition products, namely, thallic oxide and thallous chloride, depend upon both the temperature and the atmosphere around the sample. At low pressures (5×10−1 mm/Hg) there is volatilization of thallous perchlorate even at 200°.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 71 (1997), S. 143-175 
    ISSN: 1572-9338
    Keywords: Information industry, communications industry, software industry, conceptual study, optimization, economic theory, corporate strategy, general management, marketing, pricing, regulation, public policy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The Information Technology (IT) industry is seeing a great increase in the number of alliances between firms. It is important for the providers, customers and sometimes even the government to know the implications of such a development. We consider two competing organizations with differentiated products forming a strategic joint venture to offer a new product which will compete with their existing products. (An example would be the joint venture between Apple and IBM to develop a new operating system.) We focus on the ownership structure of the new product and the strategic re-positioning of the old products in terms of their price, with an emphasis on the latter. We show that the prices of the old products will increase after the introduction of the new product and they will not be taken off the market. We also show that our model unifies the salient aspects of the spatial competition and the monopolistic competition approaches of analyzing product differentiation. As a partner's stake in the joint venture increases, its price for the old product shifts further away from the level that will maximize the profit from the old product. However, the overall profit (from the old and new products) increases with the stake in the new product. The resulting feasible set of ownership structures (where both firms are better off by entering the joint venture) shifts towards greater control by the firm with the initial premium product, as the mean reservation price for the new product increases. Initially, the prices of the two products will be set at their respective mean reservation prices (and these will increase after the introduction of the new product). We show the nature of the new prices of the two old products under different scenarios. We show situations where the ordering of the prices of the old products will be maintained, and where it may be changed. The price of the new product will be set at its mean reservation price. When a part of the stake of one of the firms is distributed to a third party, it leads to lower prices for both the products. We discuss generalizations of the model and various areas of potential research.
    Type of Medium: Electronic Resource
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