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  • 1
    Electronic Resource
    Electronic Resource
    Hall effect of polycrystalline Co-Pd alloys (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5782-5785 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hall-effect measurements were carried out on a series of Co100−xPdx alloys from 4.2 to 255 K. The extraordinary Hall coefficient RS is analyzed. The side-jump mechanism is dominant for Co-Pd alloys with x≤65 at. %; however, when x(approximately-greater-than)65 at. %, both the side-jump and skew scattering mechanisms are equally effective. The Hall conductivity γH changes its sign around xH=77 at. %. xH is shifted to the right-hand side of the band-gap position xG, as implied from the anisotropic magnetoresistance data and the split-band theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358391
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A common allergenic epitope of Bermuda grass pollen shared by other grass pollens (1994)
    Springer
    Journal of biomedical science 1 (1994), S. 93-99 
    Details
    ISSN: 1423-0127
    Keywords: Common allergenic epitope ; Minor allergen ; Bermuda grass pollen ; Cyn dI ; Lol pI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The present study disclosed the cross-reactivity between Bermuda grass pollen (BGP) and other grass pollens using monoclonal antibodies (MAbs) and polyclonal antiserum. MAb 9–13, directed against a group of minor allergens of BGP (Cyn d Bd68K, 48K, 38K) was found to cross-react with extracts of ten other grass pollens. Immunoblotting assays illustrated that MAb 9–13 cross-reacted with multiple components of most of these pollens, and the major cross-reactive components had molecular weights of 29–36 kD. The cross-reactivity between BGP andLol pI, the group I allergen of rye grass pollen, was further evaluated;Lol pI was recognized by MAb 9–13, but not by our MAbs/polyclonal antiserum againstCyn dI, the major allergen of BGP. These results suggest that the epitope recognized by MAb 9–13 is a common (C) epitope shared byLol pI andCyn d Bd68K, 48K, 38K, andCyn dI does not share significant antigenicity withLol pI. In a modified radio-allergosorbent test, IgE antibodies in the serum of BGP-allergic patients reacted mildly with C-epitope-bearing components of both BGP and rye grass pollens, and this binding could be blocked specifically by MAb 9–13. This suggests that in addition to an antigenic cross-reaction, the C epitope can also lead to an allergenic cross-reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257982
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  • 3
    Electronic Resource
    Electronic Resource
    Improving nitrogen-fixing systems and integrating them into sustainable rice farming (1992)
    Springer
    Plant and soil 141 (1992), S. 57-67 
    Details
    ISSN: 1573-5036
    Keywords: aquatic legumes ; Azolla ; Cyanobacteria ; flooded rice soils ; nitrogen ; N2 fixation ; tropics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This paper summarizes recent achievements in exploiting new biological nitrogen fixation (BNF) systems in rice fields, improving their management, and integrating them into rice farming systems. The inoculation of cyanobacteria has been long recommended, but its effect is erratic and unpredictable. Azolla has a long history of use as a green manure, but a number of biological constraints limited its use in tropical Asia. To overcome these constraints, the Azolla-Anabaena system as well as the growing methods were improved. Hybrids between A. microphylla and A. filiculoides (male) produced higher annual biomass than either parent. When Anabaena from high temperature-tolerant A. microphylla was transferred to Anabaena-free A. filiculoides, A. filiculoides became tolerant of high temperature. Azolla can have multiple purposes in addition to being a N source. An integrated Azolla-fish-rice system developed in Fujian, China, could increase farmers' income, reduce expenses, and increase ecological stability. A study using Azolla labeled with 15N showed the reduction of N losses by fish uptake of N. The Azolla mat could also reduce losses of urea N by lowering floodwater-pH and storing a part of applied N in Azolla. Agronomically useful aquatic legumes have been explored within Sesbania and Aeschynomene. S. rostrata can accumulate more than 100kg N ha-1 in 45 d. Its N2 fixation by stem nodules is more tolerant of mineral N than that by root nodules, but the flowering of S. rostrata is sensitive to photoperiod. Aquatic legumes can be used in rainfed rice fields as N scavengers and N2 fixers. The general principle of integrated uses of BNF in rice-farming systems is shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011310
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  • 4
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    Immune function in mice lacking the perforin gene. (1994)
    National Academy of Sciences
    Details
    Publication Date: 1994-11-08
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 5
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    Hall effect of polycrystalline Co‐Pd alloys (1994)
    American Institute of Physics
    Details
    Publication Date: 1994-11-15
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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  • 6
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    Improving nitrogen-fixing systems and integrating them into sustainable rice farming (1992)
    Springer
    Details
    Publication Date: 1992-03-01
    Print ISSN: 0032-079X
    Electronic ISSN: 1573-5036
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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    PAPER CURRENT
  • 7
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    Development and Application of Microfabricated Chemical Gas Sensors For Aerospace Applications (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Aerospace applications require the development of chemical sensors with capabilities beyond those of commercially available sensors. In particular, factors such as minimal sensor size, weight, and power consumption are particularly important. Development areas which have potential aerospace applications include launch vehicle leak detection, engine health monitoring and control, and fire detection. Sensor development for these applications is based on progress in three types of technology: 1) Micromachining and microfabrication (Microsystem) technology to fabricate miniaturized sensors. 2) The use of nanocrystalline materials to develop sensors with improved stability combined with higher sensitivity. 3) The development of high temperature semiconductors, especially silicon carbide. Sensor development for each application involves its own challenges in the fields of materials science and fabrication technology. This paper discusses the needs of space applications and the point-contact sensor technology being developed to address these needs. Sensors to measure hydrogen, hydrocarbons, nitrogen oxides (Nox, carbon monoxide, oxygen, and carbon dioxide are being developed. A description is given of each sensor type and its present stage of development. Demonstration and application these sensor technologies will be described. The demonstrations range from use of a microsystem based hydrogen sensor on the Shuttle to engine demonstration of a nanocrystalline based sensor for NO, detection. It is concluded that microfabricated sensor technology has significant potential for use in a range of aerospace applications.
    Keywords: Mechanical Engineering
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Microfabricated Hydrogen Sensor Technology for Aerospace and Commercial Applications (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Leaks on the Space Shuttle while on the Launch Pad have generated interest in hydrogen leak monitoring technology. An effective leak monitoring system requires reliable hydrogen sensors, hardware, and software to monitor the sensors. The system should process the sensor outputs and provide real-time leak monitoring information to the operator. This paper discusses the progress in developing such a complete leak monitoring system. Advanced microfabricated hydrogen sensors are being fabricated at Case Western Reserve University (CWRU) and tested at NASA Lewis Research Center (LeRC) and Gencorp Aerojet (Aerojet). Changes in the hydrogen concentrations are detected using a PdAg on silicon Schottky diode structure. Sensor temperature control is achieved with a temperature sensor and heater fabricated onto the sensor chip. Results of the characterization of these sensors are presented. These sensors can detect low concentrations of hydrogen in inert environments with high sensitivity and quick response time. Aerojet is developing the hardware and software for a multipoint leak monitoring system designed to provide leak source and magnitude information in real time. The monitoring system processes data from the hydrogen sensors and presents the operator with a visual indication of the leak location and magnitude. Work has commenced on integrating the NASA LeRC-CWRU hydrogen sensors with the Aerojet designed monitoring system. Although the leak monitoring system was designed for hydrogen propulsion systems, the possible applications of this monitoring system are wide ranged. Possible commercialization of the system will also be discussed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-106703 , E-9065 , NAS 1.15:106703 , NASA/SPIE Symposium; Jul 24, 1994 - Jul 29, 1994; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Numerical classification of coding sequences (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: DNA sequences coding for protein may be represented by counts of nucleotides or codons. A complete reading frame may be abbreviated by its base count, e.g. A76C158G121T74, or with the corresponding codon table, e.g. (AAA)0(AAC)1(AAG)9 ... (TTT)0. We propose that these numerical designations be used to augment current methods of sequence annotation. Because base counts and codon tables do not require revision as knowledge of function evolves, they are well-suited to act as cross-references, for example to identify redundant GenBank entries. These descriptors may be compared, in place of DNA sequences, to extract homologous genes from large databases. This approach permits rapid searching with good selectivity.
    Keywords: Exobiology
    Type: Nucleic acids research (ISSN 0305-1048); 20; 6; 1405-10
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    The development of hydrogen sensor technology at NASA Lewis Research Center (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The detection of hydrogen leaks in aerospace applications, especially those involving hydrogen fuel propulsion systems, is of extreme importance for reasons of reliability, safety, and economy. Motivated by leaks occurring in liquid hydrogen lines supplying the main engine of the Space Shuttle, NASA Lewis has initiated a program to develop point-contact hydrogen sensors which address the needs of aerospace applications. Several different approaches are being explored. They include the fabrication of PdAg Schottky diode structures, the characterization of PdCr as a hydrogen sensitive alloy, and the use of SiC as a semiconductor for hydrogen sensors. This paper discusses the motivation behind and present status of each of the major components of the NASA LeRC hydrogen sensor program.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-106141 , E-7773 , NAS 1.15:106141 , Annual Space System Health Management Technology Conference; Nov 17, 1992 - Nov 18, 1992; Cincinnati, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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