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  • Other Sources  (11)
  • SPACECRAFT INSTRUMENTATION  (6)
  • COMPOSITE MATERIALS  (5)
  • 1
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    Thermal/acoustical aircraft insulation material (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Attempts made to improve the acoustical properties of low density Fiberfrax foam, an aircraft insulation material, are reported. Characterizations were also made of the physical and thermal properties. Two methods, optimization of fiber blend composition and modification of the foam fabrication process, were examined as possible means of improving foam acoustics. Flame impingement tests were also made; results show performance was satisfactory.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CR-144414
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An experiment to study energetic particle fluxes in and beyond the earth's outer magnetosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: This experiment is designed to take advantage of the ISEE Mother/Daughter dual spacecraft system to study energetic particle phenomena in the earth's outer magnetosphere and beyond. Large geometric factor fixed voltage electrostatic analyzers and passively cooled semiconductor detector telescopes provide high time resolution coverage of the energy range from 1.5 to 300 keV for both ions and electrons. Essentially identical instrumentation is placed on the two spacecraft to separate temporal from spatial effects in the observed particle phenomena.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience Electronics; GE-16; July 197
    Format: text
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  • 3
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    An experiment to measure interplanetary and solar electrons (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper describes an ISEE experiment designed to study interplanetary and solar electrons in the energy range between solar wind and galactic cosmic rays. The instrumentation is designed to identify and measure electron fluxes with high energy resolution and high sensitivity from approximately 2 keV to 1 MeV. Angular distributions of these electrons will also be obtained; in addition, energetic ions above 50 keV will be measured. Measurements of particle acceleration in solar flares, solar radio emission, interplanetary particles and shock wave acceleration, and low energy electron propagation are discussed. The instrumentation is described with emphasis on the semiconductor telescopes, the electrostatic analyzer, and the electronics.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience Electronics; GE-16; July 197
    Format: text
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  • 4
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    On-board data analysis techniques for space plasma particle instruments (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This article describes the on-board data analysis techniques used on two recent space plasma particle instruments to compute meaningful parameters of three-dimensional plasma distributions in real time. These parameters may be transmitted with much higher time resolution than the full distribution within the limited telemetry. In addition, they greatly reduce the ground processing requirements.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Review of Scientific Instruments (ISSN 0034-6748); 60; 372-380
    Format: text
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  • 5
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    Effect of heat treatment on the flexural properties of a titanium matrix composite (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Titanium matrix composites (TMC) reinforced with carbon fibers are widely used in the aerospace industry due to their light weight, high strength and modulus and the retention of their strength and modulus at elevated temperatures. Liquid infiltration, a low cost technique for making TMCs, has been little used due to the extent of the reaction between titanium and carbon during fabrication. Rapid infrared processing (RIP) has been developed as a technique for reducing interfacial reaction during composite fabrication. The strength and modulus of composites produced using RIP were higher than or comparable to those for other composites. This paper examines the effect of heat treatment on the room temperature flexural strength and modulus of TMC produced using RIP. The experiments carried out are described and results are presented. Results showed increased flexural strength of the composites upon aging at temperatures of 800 and 900 degrees C. This increased strength may be due to increased strength of the matrix.
    Keywords: COMPOSITE MATERIALS
    Type: Scripta Metallurgica et Materialia (ISSN 0956-716X); 27; 8; p. 1015-1020.
    Format: text
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  • 6
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    TiC growth in C fiber/Ti alloy composites during liquid infiltration (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A cylindrical model is developed for predicting the reaction zone thickness of carbon fiber-reinforced Ti-matrix composites, and good agreement is obtained between its predicted values and experimental results. The reaction-rate constant for TiC formation is estimated to be 1.5 x 10 exp -9 sq cm/sec. The model is extended to evaluate the relationship between C-coating thicknesses on SiC fibers and processing times.
    Keywords: COMPOSITE MATERIALS
    Type: Scripta Metallurgica et Materialia (ISSN 0956-716X); 29; 2; p. 147-152.
    Format: text
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  • 7
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    Interfacial reactions in titanium/SCS fiber composites during fabrication (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The objectrive of the study was to determine the effect of titanium concentration and different pyrocarbon fiber coatings on the morphology and the extent of fiber-matrix reactions in Ti/SiC composites fabricated by rapid infrared forming (RIF). It is found that the extent of fiber-matrix reactions in Ti/SiC composites fabricated by the RIF technique is noticeably affected by both an increase in Ti content and by the processing temperature. Uncoated SiC fibers extensively react with the titanium alloy matrix at 1200 C, whereas no reaction occurs when coated SiC fibers are used.
    Keywords: COMPOSITE MATERIALS
    Type: Scripta Metallurgica et Materialia (ISSN 0956-716X); 28; 3; p. 313-318.
    Format: text
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  • 8
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    Control of interfaces in Al-C fibre composites (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The interface of Al-C fiber composite was modified by coating a silver layer on the surface of carbon fibres prior to making composites, in an attempt to improve the wettability between molten aluminum and carbon fibers during infiltration. An electroless plating technique was adopted and perfected to provide a homogeneous silver coating on the carbon fiber surface. Al-C fiber composites were prepared using a liquid infiltration technique in a vacuum. It was found that silver coating promoted the wetting between aluminum and carbon fibers, particularly with polyacrylonitrile-base carbon fibers. However, due to rapid dissolution of silver in molten aluminum, it was believed that the improved infiltration was not due to the wetting behavior between molten aluminum and silver. The cleaning of the fiber surface and the preservation of the cleaned carbon surface with silver coating was considered to be the prime reason for the improved wettability. Interfacial reactions between aluminum and carbon fibers were observed. Amorphous carbon was found to react more with aluminum than graphitic carbon. This is believed to be because of the inertness of the graphitic basal planes.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Materials Science (ISSN 0022-2461); 28; 3; p. 760-768.
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  • 9
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    Hard X-ray and gamma-ray imaging spectroscopy for the next solar maximum (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The objectives and principles are described of a single spectroscopic imaging package that can provide effective imaging in the hard X- and gamma-ray ranges. Called the High-Energy Solar Physics (HESP) mission instrument for solar investigation, the device is based on rotating modulation collimators with germanium semiconductor spectrometers. The instrument is planned to incorporate thick modulation plates, and the range of coverage is discussed. The optics permit the coverage of high-contrast hard X-ray images from small- and medium-sized flares with large signal-to-noise ratios. The detectors allow angular resolution of less than 1 arcsec, time resolution of less than 1 arcsec, and spectral resolution of about 1 keV. The HESP package is considered an effective and important instrument for investigating the high-energy solar events of the near-term future efficiently.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: EUV, X-ray and Gamma-Ray Instrumentation for Astronomy; Jul 11, 1990 - Jul 13, 1990; San Diego, CA; United States
    Format: text
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  • 10
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    Mapping the composition of planetary surfaces by Auger electron spectroscopy (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The feasibility of AES as a remote-sensing technique to map the composition of the sunlit surfaces of planetary bodies without atmospheres is studied. Solar X-rays eject photoelectrons from the planetary surface. The resulting ions relax by emission of fluorescence X-rays or Auger electrons, with energies characteristic of the element which is ionized. The spectrum of Auger electrons and photoelectrons is computed for a variety of elements and for representative lunar rock types illuminated by soft-X-ray line and continuum emission typical of solar long-lived coronal active regions. The Auger electron lines for O, Si, Mg, Al, Fe, and Ca in lunar rocks stand well above the continuum background from photoelectrons and backscattered interplanetary electrons, with typical line-to-continuum ratios from about 20 to over 1000.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Review of Scientific Instruments (ISSN 0034-6748); 62; 660-666
    Format: text
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