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  • 1
    Electronic Resource
    Electronic Resource
    Small signal a.c. response of hot electrons in n-Hg"0"."8Cd"0"."2Te in the extreme quantum limit at low temperatures
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 54 (1993), S. 397-401 
    Details
    ISSN: 0022-3697
    Keywords: Electrical conductivity ; high frequency response ; magnetic quantization ; not electron transport
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(93)90275-V
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  • 2
    Electronic Resource
    Electronic Resource
    A modified high-temperature cell (up to 3300 K) for use with a cubic press (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3679-3682 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high temperature-high pressure pyrophyllite cell with a graphite heater has limitations when temperature exceeds ∼2100 K. A conventional cell used with the cubic anvil high pressure apparatus has been modified to reach ∼3300 K. The heater power versus temperature calibration curve has been established using Pt–Pt10%Rh thermocouple up to 1900 K. For calibration above 1900 K, the heater powers required to initiate melting in Al2O3, Y2O3, and TiB2, and decomposition of α-SiC have been determined. The melting (or decomposition) of the specimens has been detected by examining the microstructure of the specimens recovered after pressure-temperature treatment. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147135
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  • 3
    Electronic Resource
    Electronic Resource
    Cytokine-induced production of NO by macrophages induces apoptosis and immunological rejection of AK-5 histiocytic tumor (1998)
    Springer
    Apoptosis 3 (1998), S. 361-368 
    Details
    ISSN: 1573-675X
    Keywords: Apoptosis ; cytokines ; macrophages ; nitric oxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The immunological rejection of the AK-5 histiocytoma in syngeneic hosts involves the participation of NK cells and the upregulation of Th1 type cytokine response. The tumor cells are killed by necrosis and apoptosis. We have studied the role of host peritoneal macrophages in tumor regression. Activated macrophages from tumor- bearing animals produce cytokines like IL-1β, TNF-α, IL-12 and free radicals like nitric oxide during tumor regression. IL-12 and IFN-γ played a crucial role in the induction of NO production by the host macrophages, since administration of anti IL-12 and anti IFN-γ antibodies in AK-5 tumor-bearing animals suppressed NO production by the macrophages. Similarly the cytotoxic activity of the host macrophages which is dependent on NO production was also affected in antibody injected animals. These studies indicate an important role for cytokines in the activation of host macrophages which in turn produce nitric oxide that is involved in the induction of apoptosis in AK-5 cells, leading to the regression of the tumor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009685206353
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of TiN addition on sintering behaviour and mechanical properties of WC-10Co hard metals containing Mo2C and Ni (1992)
    Springer
    Journal of materials science 27 (1992), S. 1947-1959 
    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 aim of the present work was to substitute a portion of WC in WC-10 wt% Co hard metal by TiN by modification of the binder phase, and to produce an equivalent grade of hard metal. Sintering studies were carried out in both H2 and H2-N2 (50∶50) mixture. Introduction of TiN into WC-10Co hard metal resulted in a high sintered porosity, and as a consequence the mechanical properties deteriorated. Partial substitution of cobalt in WC-8.7TiN-12Co by nickel further increased the sintered porosity and led to a non-uniform microstructure. Incorporation of Mo2C along with cobalt-nickel binder promoted a fine-grained structure, which resulted in better sintered properties than those of WC-8.7TiN-6Co-6Ni hard metal. However, hot isostatic pressing (HIP) treatment of the liquid-phase sintered alloys was effective in eliminating the large pores and thus greatly enhanced the mechanical properties. HIPed hard metal of WC-8.7TiNS-12Co composition showed properties almost equivalent to those of WC-10Co hard metal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01107224
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Ti(C,N) addition on sintering behaviour and properties of binder-modified WC-10Co cemented carbide (1994)
    Springer
    Journal of materials science 29 (1994), S. 54-60 
    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 In the present investigation the microstructure and mechanical properties of WC-10Co, WC-8.3Ti(C,N)-12Co, WC-8.3Ti(C,N)-6Co-6Ni and WC-7Ti(C,N)-2Mo2C-6Co-6Ni cemented carbides were studied. Introduction of Ti(C,N) in WC-10Co cemented carbide imposed sintering difficulties and hot isostatic pressing was required to obtain fully dense material. The modification of the binder cobalt with nickel and molybdenum did not noticeably affect the sintered microstructure. In general the mechanical properties of Ti(C,N)-containing cemented carbides were inferior to those of WC-10Co cemented carbide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356572
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  • 6
    Electronic Resource
    Electronic Resource
    Hollow-fiber membrane-based rapid pressure swing absorption (1996)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 42 (1996), S. 409-421 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel gas purification technique called rapid pressure swing absorption (RAPSAB) was developed by integrating the best features of membrane contacting, gas-liquid absorption, and pressure swing adsorption (PSA). In this cyclic separation process, a well-packed microporous hydrophobic hollow-fiber module was used to achieve nondispersive gas absorption from a high-pressure feed gas into a stationary absorbent liquid on the module shell side during a certain part of the cycle followed by desorption of absorbed gases from the liquid in the rest of the cycle. The total cycle time varies between 20 s and upwards. Separation of mixtures of N2 and CO2 (around 10%) where CO2 is the impurity to be removed was studied using absorbent liquids such as pure water and a 19.5% aqueous solution of diethanolamine (DEA). Three RAPSAB cycles studied differ in the absorption part. Virtually pure N2 streams were obtained with DEA as absorbent demonstrating the capability of bulk separation to very high levels of purification. Numerical models developed predict the extent of purification for pure water and the DEA solution for one of the simpler cycles. Model simulations describe the observed behavior well.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690420211
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  • 7
    Electronic Resource
    Electronic Resource
    Oxidation behaviour of hard and binder phase modified WC-10Co cemented carbides (1992)
    Springer
    Journal of materials science 11 (1992), S. 1457-1459 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: 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/BF00729663
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