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  • 1
    Electronic Resource
    Electronic Resource
    Integration of vertical/quasivertical DMOS, CMOS and bipolar transistors in a 50 V SIMOX process
    Amsterdam : Elsevier
    Microelectronic Engineering 19 (1992), S. 733-735 
    Details
    ISSN: 0167-9317
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-9317(92)90533-W
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  • 2
    Electronic Resource
    Electronic Resource
    Isomerization of n-hexane over Pt/NH4NaY zeolite (1980)
    Springer
    Reaction kinetics and catalysis letters 13 (1980), S. 209-215 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Изомеризация н-гексана на Pt/NH4NaY описывается следующей реакционной схемой. Величины k1, k2 и kc линейно увеличиваются с увеличением степени обмена аммонийной группы в цеолите, а значительных изменений в селективности не наблюдалось. В течение активации Al частично удаляется из решетки с образованием HAlNaY.
    Notes: Abstract Isomerization of n-hexane over Pt/NH4NaY follows the reaction scheme k1, k2, kc linearly increase with increasing ammonia exchange degree in the zeolite and no significant changes in selectivity occur. During activation Al is partially removed from the lattice framework with the formation of HAlNaY.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068568
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  • 3
    Electronic Resource
    Electronic Resource
    Bialgebraic contexts for finite distributive lattices (1996)
    Springer
    Algebra universalis 35 (1996), S. 151-165 
    Details
    ISSN: 1420-8911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190975
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  • 4
    Electronic Resource
    Electronic Resource
    Radiotelemetric assessment of diel cycles in euthermic body temperature and torpor in a free-ranging small mammal inhabiting man-made nest sites (1983)
    Springer
    Oecologia 60 (1983), S. 313-315 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Five free-ranging white-footed mice, peromyscus leucopus, known to inhabit man-made nest boxes were captured during winter, surgically-implanted with temperature-sensitive radiotelemeters, and released at the site of capture. The body temperatures of mice which voluntarily inhabited nest boxes were monitored from a remote location with an AM receiver on 17 days. All five mice were able to maintain stable euthermic body temperatures (approximately 35–37°C during the day; 37–39°C at night) during exposure to subfreezing ambient temperatures. Two body temperature profiles of daily torpor were obtained from one animal. On both occasions, the mouse entered torpor approximately 2 hours before sunrise, maintained a minimum body temperature of 18°C, and was fully aroused by 1500h. The influence of thermoregulation (during euthermia and torpor) on energy expenditure and survival in free-ranging mice is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376844
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  • 5
    Electronic Resource
    Electronic Resource
    Höchstlamellarer Kohlenstoff aus Graphitoxyhydroxyd. (1948)
    Springer
    Monatshefte für Chemie 78 (1948), S. 222-242 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01141527
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  • 6
    Electronic Resource
    Electronic Resource
    Einfluß der Behandlungsbedingungen auf die Thermostabilität eines NiPdNH4NaY-Zeoliths (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 94-94 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01746756
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  • 7
    Electronic Resource
    Electronic Resource
    Herstellung und Eigenschaften von Aluminiumaquoxid. I. Böhmit aus Aluminiumnitrat und Ammoniakwasser (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 579 (1989), S. 211-220 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Properties of Aluminium Hydroxide. I. Boehmite from Aluminium Nitrate and AmmoniaThe physical-chemical properties of mainly boehmite containing aluminium hydroxide are studied which were made by continuous precipitation from aluminium nitrate solution with ammonia liquor using technical raw materials and test conditions being very similar to those applied in production. The influence of the precipitation conditions (pH value, temperature, concentration and residence time in the precipitation solution) on the composition, structure and texture of the precipitation products is investigated and information about their effect on the filtration behaviour are given.In the case of a continuous precipitation it is possible to obtain phase-pure boehmite being relatively well crystallised. The crystallinity and dispersity of the precipitated hydroxide determine their filterability and the cavity structure.
    Notes: Es werden die physikalisch-chemischen Eigenschaften von vorwiegend Böhmit enthaltenden Aluminiumaquoxiden untersucht, die durch kontinuierliches Fällen aus Aluminiumnitratlösung mit Ammoniakwasser unter Verwendung technischer Rohstoffe und bei produktionsnaher Versuchsführung hergestellt wurden. Der Einfluß der Fällbedingungen (pH-Wert, Temperatur, Konzentration und Verweilzeit in der Fällsuspension) auf die chemische Zusammensetzung, Struktur und Textur der Fällprodukte wird erforscht und über deren Auswirkung auf das Filtrationsverhalten berichtet. Im Unterschied zur diskontinuierlichen Arbeitsweise kann bei kontinuierlichem Fällen bereits nach kurzen Verweilzeiten phasenreiner, relativ gut kristalliner Böhmit erhalten werden, dessen Filtrierbarkeit mit den morphologischen Eigenschaften der Niederschläge variiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895790125
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen an Oxidischen Katalysatoren. XXX [1] Charakterisierung der Me2+ -Kationenlokalisierung in CaNaY-, MgNaY- und CaMgNaY-Zeolithen (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 461 (1980), S. 177-186 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Oxide Catalysts. XXX. Characterization of the Me2+ Localization in Zeolites CaNaY, MgNaY, and CaMgNaYData for exchange of the cations Ca2+, Mg2+, as well as Ca2+ and Mg2+ into the zeolite NaY have been determined. From this it was concluded on the localization of Me2+ cations in hydrated samples.The adsorption of ammonia in the temperature region of 420 to 670 K, the determination of the heats of immersion in water and nitromethane and the Me2+ —CO-interaction indicated by IR spectroscopy yielded informations on the localization of cations in dehydrated samples.The results show that cations Ca2+ more selectively than cations Mg2+ occupy positions in the small cages. In the case of the competitive cation exchange this fact causes a site directed distribution of cations in zeolite cages.
    Notes: Unter Verwendung von Ioneaustauschdaten für den Eintausch von Mg2+-, Ca2+- sowie Mg2+- und Ca2+-Ionen in NaY-Zeolithe werden Aussagen zur Lokalisierung der Kationen im hydratisierten Zustand der Proben getroffen.Die Ammoniakadsorption im Bereich von 420 bis 670 K, die Ermittlung der Immersionswärmen in Wasser und Nitromethan und die IR-spektroskopisch indizierte Me2+ -Co-Wechselwirkung liefern Informationen über die Kationenlokalisierung in den dehydratisierten Proben.Die Ergebnisse zeigen, daß Ca2+-Kationen selektiver als Mg2+-Kationen Positionen des kleinen Hohlraumsystems besetzen. Beim konkurrierenden Ionenaustausch wirkt sich die selektive Besetzung von Positionen des kleinen Hohlraumsystems mit Ca2+-Kationen dirigierend auf die Verteilung der Kationen im Zeolith aus.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804610127
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen an oxidischen Katalysatoren. XXXV. Redoxverhalten des Nickels in NiNaY-Zeolithen 2. Untersuchungen zur Dispersität von Ni- und Ni/NiO-Teilchen in reduzierten und reoxydierten NiNaY-Proben (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 499 (1983), S. 223-230 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Oxide Catalysts. XXXV. Redoxbehaviour of Nickel in Zeolite NiNaY. 2. Investigation on the Dispersion of Ni- und Ni/NiO-Species in Reduced and Reoxidized NiNaY SamplesOxygen chemisorption and electronmicroscopic measurements (ultramicrotome technique) correspondingly show a decrease of the metal dispersion with increasing reduction temperature (470-870 K) and exchange degree (10, 29, 54 equ.-% resp.). Contrary to this results electronmicroscopic measurements with replica technique don't reflect such a dependence. Increase of particle size after reoxidation (470 K) and reduction at 470 to 870 K (regeneration) of the NiNaY samples are attributed on the one hand to the aggregation of oxidic particles and on the other hand to metal sintering by the subsequent reduction step. A decrease of dispersion after a reoxidation process at 670 K is caused by formation and relocalisation of isolated nickel ions.
    Notes: Sauerstoffchemisorptionsmessungen und elektronenmikroskopische Untersuchungen (Ultramikrotomschnitte) an reduzierten NiNaY-Proben zeigen übereinstimmend eine Verringerung der Metalldispersität mit steigender Reduktionstemperatur (470-870 K) und zunehmendem Ni2+-Austauschgrad (10, 29 bzw. 54 Äqu.-%). Dagegen ist aus elektronenmikroskopischen Aufnahmen mittels der Kohlehülltechnik eine solche Abhängigkeit nicht zu entnehmen. Eine Teilchenvergrößerung nach Reoxydation (470 K) und Reduktion bei 470 bis 870 K (Regeneration) der NiNaY-Proben ist sowohl auf eine Aggregation der Oxidteilchen als auch auf das Sintern des Metalls im Reduktionsprozeß zurückzuführen. Zur Dispersitätsverschlechterung nach Reoxydation bei 670 K trägt aber auch die Bildung und Refixierung isolierter Nickelionen bei.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19834990425
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  • 10
    Electronic Resource
    Electronic Resource
    Einfluß von Sauerstoffzusätzen beim Gasnitrieren auf den strukturellen Aufbau von Nitrierschichten (1998)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 29 (1998), S. 588-594 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of oxygen additions during gas nitriding on the structure of the nitrided layersThe influence of controlled oxygen additions during gas nitriding of steels on the structure and built-up of the nitrided layers as well as on the nitriding reactions was investigated with metallurgical methods and Mössbauer spectroscopy.The results show that oxygen additions below the oxidising threshold slightly improve the nitriding behaviour of unalloyed steels. Furthermore, it is shown that for alloyed steel, which are tending to passivation starting form chromium concentrations of 3%, the nitriding can be considerably improved by oxygen additions. The passivation layers present for these steels are destroyed by external oxidation during the oxinitriding process. This external oxidation and the internal nitriding occurred parallel in the early stages of the oxinitriding.
    Notes: Die Wirkung kontrollierter sauerstoffhaltiger Zusätze beim Gasnitrieren von Stählen auf den strukturellen Aufbau der Nitrierschichten und den Ablauf der Nitrierreaktion unter technischen Bedingungen wurde mit metallkundlichen Untersuchungsmethoden unter Einbeziehung der Mössbauer Spektroskopie verfolgt.Die Ergebnisse der durchgeführten Untersuchungen zeigen, daß Sauerstoffzusätze unterhalb der Oxidationsgrenze des reinen Eisens das Nitrierverhalten unlegierter Stähle etwas verbessern können. Weiter konnte gezeigt werden, daß bei legierten Stählen, die schon bei Chromgehalten ab 3% bei der konventionellen Gasnitrierung zur Passivierung neigen, die Nitrierung durch einen Sauerstoffzusatz erheblich verbessert werden kann. Die auf diesen Stählen vorhandenen Passivschichten werden beim Oxinitrieren durch eine äußere Oxidation zerstört. Diese äußere Oxidation und die innere Nitrierung laufen in der Anfangsphase des Oxinitrierens parallel ab.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19980291008
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