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  • 1
    Electronic Resource
    Electronic Resource
    Diversity associated with the second expressed H L A - D R B locus in the human population (1997)
    Springer
    Immunogenetics 46 (1997), S. 104-110 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Although diversity within the HLA-DRB region is predominantly focused in the DRB1 gene, the second expressed DRB loci, DRB3, DRB4, and DRB5, also exhibit variation. Within DRB1 * 15 or DRB1 * 16 haplotypes, four new variants were identified: 1) two new DRB5 alleles, DRB5 * 0104 and DRB5 * 0204, 2) a haplotype carrying a DRB1 * 15 or * 16 allele without the usual accompanying DRB5 allele, and 3) a haplotype carrying a DRB5* 0101 allele without a DRB1 * 15 or * 16 allele. The evolutionary origins of these haplotypes were postulated based on their associations with the DRB6 pseudogene. Within HLA haplotypes which carry DRB3, a new DRB3 * 0205 allele and one unusual DRB3 association were identified. Finally, two new null DRB4 alleles are described: DRB4 * 0201N, which exhibits a deletion in the second exon, and a second allele, DRB4 * null, which lacks the second exon completely. Gene conversion-like events and variation in the number of functional genes through reciprocal recombination and inactivation contribute to the diversity observed in the second expressed HLA-DRB loci.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510050248
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  • 2
    Electronic Resource
    Electronic Resource
    Sulfur Dioxide Sorption Properties and Thermal Stability of Hydrophobic Zeolites (1995)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 34 (1995), S. 4063-4070 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00038a048
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  • 3
    Electronic Resource
    Electronic Resource
    Evolution of Pore and Phase Structure of Sol-Gel Derived Lanthana Doped Titania at High Temperatures (1995)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 34 (1995), S. 1189-1195 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00043a022
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  • 4
    Electronic Resource
    Electronic Resource
    Low-leakage current and high-breakdown voltage GaAs-based heterostructure field-effect transistor with In0.5(Al0.66Ga0.34)0.5P Schottky layer (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3551-3553 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An In0.5(Al0.66Ga0.34)0.5P/GaAs heterostructure field-effect transistor has been fabricated by metal-organic chemical vapor deposition. A turn-on voltage as high as 3.2 V along with an extremely low gate reverse leakage current of 69 μA/mm at VGD=−40 V are achieved. In addition, it is found that the device can be operated with gate voltage up to 1.5 V without significant drain current compression. These characteristics are attributed to the use of high Schottky barrier height, high band gap of In0.5(Al0.66Ga0.34)0.5P Schottky layer, and to the large conduction-band discontinuity at the In0.5(Al0.66Ga0.34)0.5P/GaAs heterojunction. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125385
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  • 5
    Electronic Resource
    Electronic Resource
    High breakdown voltage symmetric double δ-doped In0.49Ga0.51P/In0.25Ga0.75As/GaAs high electron mobility transistor (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1616-1618 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A double δ-doped In0.49Ga0.51P/In0.25Ga0.75As/GaAs high electron mobility transistor has been successfully fabricated by metalorganic chemical-vapor deposition. Improved electron mobility as high as 5410 (19 200) cm2/V s at 300 (77) K along with turn-on voltage as high as 2.3 V and reverse gate-to-drain voltage up to 75 V are achieved. These characteristics are attributed to the use of the δ-doped, undoped InGaP Schottky layer, and undoped GaAs setback layer. Moreover, the parasitic parallel conduction can be eliminated. The activation energy is also deduced. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124772
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  • 6
    Electronic Resource
    Electronic Resource
    High efficiency guided-wave magnetooptic Bragg cell modulator using nonuniform bias magnetic field (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3715-3717 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A technique for large enhancement of the diffraction efficiency of a guided-wave magnetooptic (MO) Bragg cell modulator using a nonuniform bias magnetic field in bismuth-doped yttrium iron garnet-gadolinium gallium garnet waveguide is reported. Since the velocity of propagation of the magnetostatic forward volume wave (MSFVW) varies with the bias magnetic field, a bias magnetic field of proper spatial distribution will modify its wave front and, thus, create a lensing effect upon the MSFVW. This lensing effect in turn reduces the angular beam spread of the MSFVW, and results in a higher MO Bragg diffraction efficiency. The experimental data obtained for the cases with uniform and nonuniform bias magnetic fields at the carrier center frequency range of 2.0–3.5 GHz have demonstrated a diffraction efficiency enhancement by two to six times. A diffraction efficiency as high as 70% has also been accomplished. Furthermore, the measured frequency responses indicate that the nonuniform bias magnetic field has had only a mild effect on the bandwidth of the MO Bragg cell modulator. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120491
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of Suspension-Derived, Porous Ion-Conducting Ceramic Membranes (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Porous, oxygen-ion-conducting ceramic membranes can have applications as supports for fuel cells, sensors, and thin membrane films, or as filters for membrane filtration. This paper reports on the preparation of unsupported and supported yttria-stabilized zirconia (YSZ) and yttria-doped bismuth oxide (BY) membranes with submicrometer pore sizes. Fluorite-structured BY powder that has been synthesized using the citrate method and commercial YSZ powder have been used to prepare stable aqueous suspensions. Unsupported and supported YSZ and BY membranes have been prepared from the stable suspensions of YSZ and BY. The supported BY membranes are crack free but contain small defects. Defect-free YSZ membranes that are supported on porous alumina have been prepared under controlled conditions. The average pore size is 100 nm, with a porosity of 57%, for an unsupported YSZ membrane (measured by mercury porosimetry), and 114 nm for a supported membrane (as estimated via helium permeation). The ionic conductivity of the YSZ membranes is 0.00044–0.01 S/cm in the temperature range of 600°–900°C, which is lower than that of dense YSZ disks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb02135.x
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  • 8
    Electronic Resource
    Electronic Resource
    Comparison of GC-MS and HPLC for overcoming matrix interferences in the analysis of PAHs in smoked food (1997)
    Springer
    Chromatographia 44 (1997), S. 497-504 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Gas chromatography-mass spectrometry ; Column liquid chromatography ; Polycyclic aromatic hydrocarbons ; Food analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Several separation and detection methods for polycyclic aromatic hydrocarbons (PAHs) in smoked chicken by GC and HPLC were compared. With HPLC and a gradient solvent system, all 16 PAHs could be simultaneously separated and detected by fluorescence with seven settings of programmable wavelength (excitation/emission). The presence of impurities in smoked chicken could interfere with the subsequent identification and quantification of PAHs by HPLC. With GC and a temperature programming method, all 16 PAHs could be separated and the PAHs in the chicken sample could be detected with an ion-trap mass spectrometer even in the presence of fat-or PAH-like impurities. Nine PAHs were identified by the former method while fourteen PAHs were identified by the latter method. The retention times by HPLC were shorter than those by GC, also, the former had better separation for most PAHs than the latter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466743
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  • 9
    Electronic Resource
    Electronic Resource
    Identification of and compensation for backlash on the contouring accuracy of CNC machining centres (1997)
    Springer
    The international journal of advanced manufacturing technology 13 (1997), S. 77-85 
    Details
    ISSN: 1433-3015
    Keywords: Backlash ; Contouring accuracy ; Optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The paper describes a technique for the identification of and compensation for backlash on the contouring accuracy of computer numerically controlled (CNC) machining centres. A circular test that has been developed for rapidly checking the contouring accuracy of CNC machine tools is used to measure the contouring error due to backlash. Backlash error on the contouring profile is found as the direction of motion is reversed. A compensation strategy based on a simulated annealing (SA) optimisation algorithm is then developed to reduce the backlash error. Computational simulations and experimental tests have shown that the contouring error due to backlash can be greatly reduced by using this new approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01225753
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  • 10
    Electronic Resource
    Electronic Resource
    Hydrothermal stability of pure and modified microporous silica membranes (1995)
    Springer
    Journal of materials science 30 (1995), S. 2803-2808 
    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 hydrothermal stability of microporous (0.6 nm) silica membranes prepared by the sol-gel process was studied at 600 and 800 °C in a 50 mol% steam atmosphere. The membranes remained microporous after calcination and hydrothermal treatment at 600 °C for 30 h but a substantial reduction in the specific surface area (48%) accompanied by a 77% decline in the micropore volume was observed. Hydrothermal treatment at 800 °C for 30 h resulted in complete densification of the membranes. The effect of alumina and magnesia on the hydrothermal stability of the membranes was investigated. Both Al2O3 and MgO were introduced into the membranes by doping the starting silica sol with controlled amounts of the corresponding nitrate salts. Alumina did not change the pore structure of the silica membranes which retained a large part of their microporosity after hydrothermal treatment at 600 °C compared to pure silica membranes. Doping with magnesia, however, resulted in lower specific surface areas relative to those of pure and alumina-doped silica membranes after drying and calcination. These effects on the stability of the membranes are explained by assuming structural changes in the membranes catalysed by magnesia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349647
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