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  • 1
    Electronic Resource
    Electronic Resource
    Synchrotron radiation assisted deposition of aluminum oxide from condensed layers of trimethylaluminum and water at 78 K (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 729-731 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectroscopic evidence is presented that shows that synchrotron irradiation of trimethylaluminum (TMA) and water at 78 K on a silver substrate produces pure layers of aluminum oxide. Near-edge x-ray absorption fine structure and core level photoelectron spectroscopies are used to characterize the Al2O3 layer, which was 30 A(ring) thick. The carbon component in the alkylaluminum precursor is completely removed during irradiation as volatile methane product. In the absence of synchrotron radiation the molecular precursors show evidence of some interactions within the solid, but upon warming to ambient temperatures (260 K) the adsorbed layers desorb from the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107781
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  • 2
    Electronic Resource
    Electronic Resource
    Deposition of amorphous fluoropolymer thin films by thermolysis of Teflon amorphous fluoropolymer (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1866-1868 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films (0.3–5 μm) of an amorphous fluoropolymer (AF) derived from the copolymeric material Teflon AF 1600 were deposited on Si (100) wafers by vacuum pyrolysis. Infrared spectroscopy indicated that the composition of the deposited films was similar to the source material. The deposited films were amorphous by x-ray diffraction. The surface morphology contained micropores which did not extend through films deposited at a low rate. The refractive index was ∼1.2 at 633 nm. Comparisons are made to films derived from ordinary Teflon (also by pyrolysis). The mechanism for the repolymerization of the Teflon AF copolymer at the substrate surface is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107163
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  • 3
    Electronic Resource
    Electronic Resource
    Circadian differences in pharmacological blockade of meal-stimulated gastric acid secretion (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 6 (1992), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The effects of identical morning (08.05 hours) and evening (20.05 hours) meals on intragastric pH were compared in 12 healthy volunteers receiving gastric antisecretory medication. Dosing included continuous intravenous infusion ranitidine (50 mg bolus followed by 12.5 mg/h) or a matching placebo which were randomly administered prior to and following 7 days of treatment with oral omeprazole (40 mg mane). Intragastric pH was monitored continuously using a tethered indwelling pH probe. Subjects were divided into groups, one of which began the pH monitoring session in the morning, the other in the evening. The median 24-h intragastric pH was significantly increased by all active dosing regimens (P 〈 0.05). Combined omeprazole and ranitidine produced the highest median pH, 5.92. However, a breakthrough drop in intragastric pH occurred during the evening after all active dosing. Intragastric pH fell prior to and after consumption of the evening meal with median pH values less than 4 during all sessions. The evening meal led to significantly lower intragastric pH compared to the morning meal for omeprazole and the combined omeprazole and ranitidine dosing periods (P 〈 0.05). There was no difference between morning and evening pH during the placebo or ranitidine periods. Ranitidine and omeprazole, either alone or in combination, were unable to prevent the mealstimulated decline in intragastric pH during the evening time period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2036.1992.tb00262.x
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  • 4
    Electronic Resource
    Electronic Resource
    Blends of poly(enamino nitrile) (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 1427-1432 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00031a011
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  • 5
    Electronic Resource
    Electronic Resource
    The electron momentum density in the highest energy occupied molecular orbital of borazine, B3N3H6: evidence for localization (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 1114-1115 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00029a064
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  • 6
    Electronic Resource
    Electronic Resource
    Materials chemistry of chiral macromolecules. 1. Synthesis and phase transitions (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 3429-3441 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00035a041
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  • 7
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    Kant's ethical community (1992)
    The Hague : Periodicals Archive Online (PAO)
    The Journal of Value Inquiry. 26:1 (1992) 51 
    Details
    ISSN: 0022-5363
    Topics: Philosophy
    Notes: Special Issue: Insensitivity, Egoism, and the Ethical Community
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:n252-1992-026-01-000006
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  • 8
    Electronic Resource
    Electronic Resource
    Toward time-varying balanced realization via Riccati equations (1992)
    Springer
    Mathematics of control, signals, and systems 5 (1992), S. 313-326 
    Details
    ISSN: 1435-568X
    Keywords: Balanced realization ; Time-varying systems ; Riccati equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics , Technology
    Notes: Abstract This paper presents a new approach for solving balanced realization problems with emphasis on the time-varying case. Instead of calculating the exact solutions for balancing at each time instant, we estimate with arbitrary accuracy the balancing solutions by means of Riccati equations associated with the balancing problems Under uniform boundedness conditions on the controllability and observability grammians and their inverses, the solutions of the Riccati equations exist and converge exponentially as their initial time goes to — ∞ to give what we term μ-balancing solutions. The parameter μ has the interpretation of the gain of a differential equation. It determines the accuracy of the balancing transformation tracking and the exponential rate of convergence. Their exponentially convergent behavior ensures numerical robustness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01211564
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  • 9
    Electronic Resource
    Electronic Resource
    Combustion synthesis of TiNi intermetallic compounds (1992)
    Springer
    Journal of materials science 27 (1992), S. 5067-5072 
    Details
    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 microstructural characteristics of NiTi intermetallic shape memory compounds produced by combustion synthesis have been investigated. It was found that the microstructure consists mainly of NiTi parent phase and NiTi2 second phase. The faceted or coarse dendritic NiTi2 phase, which is produced using a low cooling rate of the synthesized liquid product, can be modified to provide an evenly distributed, fine dendritic structure by increasing the cooling rate. This fine dendritic product can be readily hot-rolled into plate exhibiting the shape memory effect (SME). The initial nickel particle size has an important influence on the microstructure and also on the SME transition temperature. The morphology of the microstructure can also be modified to that of conventionally produced alloy by solution treatment. It is proposed that the synthesis reaction mechanism occurs by two combustion stages, i.e. precombustion and combustion. The particle size plays a key role in the precombustion stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01105275
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of heating rate on the combustion synthesis of Ti-Al intermetallic compounds (1992)
    Springer
    Journal of materials science 27 (1992), S. 6797-6806 
    Details
    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 Titanium aluminide compounds were synthesized by the thermal explosion mode of self-propagating high-temperature synthesis (SHS). The effects of heating rate on the combustion characteristics and the microstructures of the products were studied. It was found that the low density of the reacted sample was due to the outgassing of water vapour and other gases, which were released by dissociation of hydrated aluminium oxides. Higher heating rates resulted in a product of higher density and single-phase microstructure. At lower heating rates, the reaction product was a mixture of phases for TiAl and Ti3Al reactions. A liquid (Al)-solid (Ti) reaction mechanism is predicted for slow heating while a solid-solid mechanism is expected for high heating rates. The origin of porosity in the product is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01165971
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