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  • Chemistry  (8)
  • Computer Systems  (4)
  • TEM
  • 2005-2009  (4)
  • 1970-1974  (4)
  • 1950-1954  (2)
  • 1925-1929  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 173 (1928), S. 125-136 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Wenn ozonisierter Sauerstoff durch Lösungen von Eosin, Uranin, Safranin, Neutralrot, Rhodamin B, Thioflavin, Cartharamin Rhodamin B. J. N. N., Erythrosin und Aesculin geleitet wird, beobachtet man ein Leuchten.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 186 (1929), S. 154-158 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Wenn zahlreiche fluorescierende oder nicht fluorescierende Farbstofflösungen durch Wasserstoffperoxyd in Gegenwart von Ferrosulfat oxydiert werden, tritt ein Glimmen auf, das im dunklen Raume zu erkennen ist.2. Die Wellenlangen der Glimmerscheinung bei der Oxydation einiger fluorescierender Fnrbstoffe durch ozonisierten Sauerstoff sind gemessen worden.3. Kieselsaure mit etwas adsorbiertem Neutralrot zeigt in einer Suspension in Äthylallrohol bei Behandlung mit ozonisiertem Sauerstoff eine Glimmerscheinung.4. Wenn kleine Mengen eines Farbstoffes, der gutes Glimmen zeigt , rnit einem anderen Farbstoff von schwachem Glimmvermogen gemischt werden, so liefert das Gemisch bei Behandlung mit Ozon ein starkeres Glimmen als der schwächer glimmende Farbstoff allein.5. Steigerung der Temperatur führt zur Verstarkung des Glimmens bei der Oxydation von Reduktionsmitteln durch Ozon oder Wasserstoffperoxyd.6. Zunahme der Konzentration der Reduktionsmittel verursacht eine Steigerung der Glimmintensitat bis zu einem Grenewert. Wird die Konzentration weiter gesteigert, so schwacht sich das Glimmen ab und hört schließlich auf.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 163 (1973), S. 37-43 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Substanzpolymerisation von N-Vinylcarbazol (NVC) wurde mit 3d-Metalloxid-Katalysatoren durchgeführt, und die folgende Reaktivitätsreihe für die untersuchten Oxide wurde vorgeschlagen: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm V}_{\rm 2} {\rm O}_{\rm 5} {\rm 〉 MnO}_{\rm 2} {\rm 〉 TiO}_{\rm 2} {\rm 〉 Cr}_{\rm 2} {\rm O}_{\rm 3} {\rm 〉 NiO 〉 ZnO 〉 Cu}_{\rm 2} {\rm O 〉 CuO 〉 Co}_{\rm 3} {\rm O}_{\rm 4} {\rm andCoO} $$\end{document} wobei die Oxide des Kupfers und Kobalts nicht wirksam sind. Einige kinetische Untersuchungen wurden mit dem System NVC/MnO2 ausgeführt. Auf Grund der Verzögerung der Polymerisationsgeschwindigkeit bei Gegenwart von Wasser oder Thiophen wurde ein kationischer Mechanismus für die Polymerisation vorgeschlagen. Die Wirkungslosigkeit der Kupfer- und Kobaltoxide als Katalysatoren wurde vorläufig mit der Annahme gedeutet, daß sie eher oxydierend wirken als durch π-Komplex-Bindung. Rühren übt keinen Einfluß auf die Polymerisationsgeschwindigkeit aus.
    Notes: The bulk polymerization of N-Vinylcarbazole (NVC) is carried out using some 3 d-metal oxides as catalysts and the following order of reactivity is suggested for the various metal oxides studied: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm V}_{\rm 2} {\rm O}_{\rm 5} {\rm 〉 MnO}_{\rm 2} {\rm 〉 TiO}_{\rm 2} {\rm 〉 Cr}_{\rm 2} {\rm O}_{\rm 3} {\rm 〉 NiO 〉 ZnO 〉 Cu}_{\rm 2} {\rm O 〉 CuO 〉 Co}_{\rm 3} {\rm O}_{\rm 4} {\rm andCoO} $$\end{document} the oxides of copper and cobalt being ineffective. Some kinetic studies are carried out with the NVC/MnO2 system. Endorsed by the observed retardation of the rate in the presence of water and thiophene a cationic mechanism is suggested for the polymerization. The incapability of the oxides of Cu and Co to act as good catalysts is tentatively explained by supposing that they act as oxidizing rather than π-complexing polymerization catalysts. Stirring does not show any influence on the rate of polymerization.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 151 (1972), S. 121-125 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Störung der Metachromasie eines an einem Polyanion gebundenen Farbstoffs durch Cetylpyridiniumchlorid (CPCl) wurde quantitative abgeschätzt, indem die in der wässerigen Schicht verbliebenen Farbstoffmengen nach Schütteln der metachromatischen Lösung mit Tetrachlorkohlenstoff in An- und Abwesenheit von CPCl ermittelt wurden. Die Aufhebung der Metachromasie wurde außerdem aus der konduktometrischen Titration der Farbstoff/Polyanion-Lösung mit CPCl ermittelt. CPCl verdrängt die Farbstoffionen von den Polyanionen beinahe stöchiometrisch, was bei Natriumchlorid nicht der Fall ist. Dieses besondere Verhalten von CPCl wird seiner Neigung zur Bildung hydrophober Bindungen zugeschrieben. Es wurden Methylenblau und Kristallviolett als Farbstoffe sowie Chondroitinschwefelsäure und Heparin als Polyanionen verwendet
    Notes: The disturbance of metachromasia of a dye/polyanion system by cetyl pyridinium chloride (CPCl) has been estimated quantitatively from the difference of the amounts of dye left in the aqueous layer after carbon tetrachloride extraction of the metachromatic solution in the presence and absence of CPCl, as well as from conductometric titration of the dye/polyanion solution with CPCl. Results show that CPCl, unlike sodium chloride, displaces the dye ions from the polyanions almost stoichiometrically. This special behaviour of CPCl has been assigned to its tendency to form hydrophobic bonds. As dyes methylene blue and crystal violet, as polyanions chondroitin sulfate and heparin have been used.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 34 (1951), S. 652-677 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die vorliegende Arbeit befasst sich mit der Konstitutionsaufklärung des Andrographolids, eines Bitterstoffes der indischen Medizinalpflanze Andrographis paniculata Nees. Verschiedene, in der früheren Literatur vorkommende Widersprüche und Unstimmigkeiten konnten dabei abgeklärt werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 13 (1954), S. 461-469 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The scattering of light by solutions of a well-fractionated sample of polymethyl methacrylate in acetone, methyl ethyl ketone, and benzene, have been measured using 4358 and 5461 A. wave lengths as incident radiations. The average molecular weights of the polymer from turbidity measurements and lengths determined from angular dissymmetries of scattered light are 571,000 and 760 A. in acetone, 38,400,000 and 715 A. in methyl ethyl ketone, and 408,000 and 375 A. in benzene. The abnormal molecular weight observed in methyl ethyl ketone solution may be ascribed to low μ - μ0 value of the medium. The greater molecular extension in ketone than in benzene solutions is explained in terms of the relative magnitudes of solute-solvent interaction. The depolarization ratios ρu, ρv and ρh have been measured and the decrease of ρv and ρh with increase in concentration of the polymer in ketonic solvents and little change under similar conditions in benzene, are discussed in the light of the “molecular field effect” of Gans.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 11 (1973), S. 639-643 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 12 (1974), S. 543-543 
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 2019-07-18
    Description: High-End Computing (HEC) has always played a major role in meeting the modeling and simulation needs of various NASA missions. With NASA's newest 62 teraflops Columbia supercomputer, HEC is having an even greater impact within the Agency and beyond. Significant cutting-edge science and engineering simulations in the areas of space exploration, Shuttle operations, Earth sciences, and aeronautics research, are already occurring on Columbia, demonstrating its ability to accelerate NASA s exploration vision. The talk will describe how the integrated supercomputing production environment is being used to reduce design cycle time, accelerate scientific discovery, conduct parametric analysis of multiple scenarios, and enhance safety during the life cycle of NASA missions.
    Keywords: Computer Systems
    Type: International Supercomputer Conference (ISC 2006); Jun 27, 2006 - Jun 30, 2006; Dresden; Germany
    Format: text
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  • 10
    Publication Date: 2019-07-11
    Description: This paper reports on an on-going Project to investigate techniques to diagnose complex dynamical systems that are modeled as hybrid systems. In particular, we examine continuous systems with embedded supervisory controllers that experience abrupt, partial or full failure of component devices. We cast the diagnosis problem as a model selection problem. To reduce the space of potential models under consideration, we exploit techniques from qualitative reasoning to conjecture an initial set of qualitative candidate diagnoses, which induce a smaller set of models. We refine these diagnoses using parameter estimation and model fitting techniques. As a motivating case study, we have examined the problem of diagnosing NASA's Sprint AERCam, a small spherical robotic camera unit with 12 thrusters that enable both linear and rotational motion.
    Keywords: Computer Systems
    Format: application/pdf
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