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  • 1980-1984  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 434 (1984), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 25 (1982), S. 279-290 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Phasendiagramm des La-S-O-Systems bei 1073 K wurde bestimmt. Bei dieser Temperatur liegen 6 Phasen vor, und zwar La2O3 (B-Typ), LaS2, La2S3, La2O2SO4, La2O2S und La2O2S2. Für die Reaktion La2O2SO4=La2O3+SO2+1/2 O2 wurden die thermodynamischen Funktionen im Temperaturbereich von 1123–1373 K nach der EMF-Methode bestimmt. DTA, TG und Pulver-Röntgendiffraktometrie wurden zur Untersuchung der Mechanismen der im La-S-O-System verlaufenden Oxydationsreaktionen herangezogen, wobei der Sauerstoffpartialdruck in den Grenzen von − 4.4 〈 log $$p_{O_2 }$$ 〈 〈-0.7 variiert wurde.
    Abstract: Резюме С помощью вакуумной и золированной техник и была установлена фаз овая диаграмма системы La-S-O п ри 1073 К. При этой темпера туре существует шесть фаз: La2O3 (Б-типа), LaS2, La2S3, La2O2SO4, La2O2S и La2O2S2. Используя метод э. д. с., были определены термодинамические п араметры реакции La2O2SO4=La2O3+ SO2+1/2 О2 в температурном интербале 1123–1373. С помощь ю ДТА, ТГ и порошковой рентгенодиффрактом етрии исследованы механиз мы реакций в системе La-S-O б области парциальных давлени й кислорода −4.4 〈 log $$P_{O_2 }$$ 〈 −0.7.
    Notes: Abstract The phase diagram of the La-S-O system at 1073 K was established with the vacuum seal technique. Six phases exist at this temperature: La2O3 (B-type), LaS2, La2S3, La2O2SO4, La2O2S and La2O2S2. The thermodynamic functions for the reaction La2O2SO4=La2O3+SO2+1/2 O2 were determined by using the emf method at temperatures from 1123 to 1373 K. The mechanisms of the oxidation reactions in the La-S-O system under different partial pressures of oxygen (−4.4 〈 log $$P_{O_2 }$$ 〈−0.7) were also investigated by means of DTA, TG and powder X-ray diffractometry.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 15 (1981), S. 697-718 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Blood compatibility has been studied for hydrophilic polymers such as poly(vinyl alcohol) (PVA), its derivative, and polyethylene grafted with water-soluble monomers. The surfaces in contact with electrolyte solutions have been characterized by measuring the zeta potentials. The study of plasma protein adsorption on these polymers has revealed that bovine serum albumin as well as bovine serum fibrinogen adsorbs to a lesser extent as the hydrophilicity of the polymers increases. Platelet deposition and fibrin formation, examined using platelet-rich plasma, have been found to take place less significantly on PVA as well as sodium acrylate- and acrylamide-grafted polyethylene than on nongrafted and acrylic acid-grafted polyethylene. Ex vivo experiments with canine whole blood have shown that formation of thrombus on PVA is less than on siliconized glass but increases upon heat treatment which reduces the hydrophilicity. When PVA tubes of about 1 mm diameter are anastomosed to the carotid artery of rat, the patency rate is found to depend strongly on the anastomotic technique. From the results on the zeta potential and the experiments in vitro and ex vivo it can be concluded that the material having a surface from which solvated, neutral chains are extended into the outer aqueous phase may exhibit excellent resistance to thrombus formation.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 461 (1980), S. 234-240 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Wachstum von Einkristallen der Vanadiumsulfide und ihre elektrische LeitfähigkeitDie Gleichgewichtsisotherme im System V-S bei 900°C wurde nach der Methode der Variation des Schwefeldampfdruckes bestimmt. Einkristalle von V2S3 wurden durch chemischen Transport erhalten. Ihre Zusammensetzung entsprach befriedigened den Werten der Gleichgewichtsisotherme zwischen heiß Zone (900°C) und kälterer Zone. Die elektrische Leitfähigkeit der Einkristalle wurde bei Temperaturen zwischen - 196°C und +25°C gemessen; es liegt metallische Leitfähigkeit vor ohne erkennbare Abhängigkeit von wechselnder Zusammensetzung. Die Leitfähigkeit gesinterter Proben verschiedener Vanadiumsulfide von VS1,38 (V3S4-Phase) bis VS1,58 (V5S8-Phase) wurde ebenfalls bestimmt.
    Notes: An equilibrium isotherm on V-S system at 900°C was determined by changing partial pressure of sulfur. Single crystals of several V5S8 and V2S3 compounds were grown by chemical transport. The grown crystals almost satisfied compositional relation on equilibrium isotherms between 900°C (hot zone) and lower temperatures (cold zone). Electrical conductivity of the single crystals was measured at temperatures from liquid nitrogen to 25°C. It showed metallic behavior without any significant dependence on compositional variation. Also the conductivity measurement of sintered samples for various vanadium sulfides was carried out in the compositional range from VS1,38 (V3S4 phase) to VS1,58 (V5S8 phase).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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