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  • 1
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    Further seismic properties of a spring-block earthquake model (1999)
    In:  Geophys. J. Int., Luxembourg, EGS-Gauthier-Villars, vol. 139, no. 2, pp. 410-418, pp. L23303
    Details
    Publication Date: 1999
    Keywords: Modelling ; Statistical investigations ; SOC ; Seismicity ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Insulin attenuates atrophy of unweighted soleus muscle by amplified inhibition of protein degradation (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Unweighting atrophy of immature soleus muscle occurs rapidly over the first several days, followed by slower atrophy coinciding with increased sensitivity to insulin of in vitro protein metabolism. This study determined whether this increased sensitivity might account for the diminution of atrophy after 3 days of tall-cast hindlimb suspension. The physiological significance of the increased response to insulin in unweighted muscle was evaluated by analyzing in vivo protein metabolism for day 3 (48 to 72 hours) and day 4 (72 to 96 hours) of unweighting in diabetic animals either injected with insulin or not treated. Soleus from nontreated diabetic animals showed a similar loss of protein during day 3 (-16.2%) and day 4 (-14.5%) of unweighting, whereas muscle from insulin-treated animals showed rapid atrophy (-14.5%) during day 3 only, declining to just -3.1% the next day. Since fractional protein synthesis was similar for both day 3 (8.6%/d) and day 4 (7.0%/d) of unweighting in insulin-treated animals, the reduction in protein loss must be accounted for by a slowing of protein degradation due to circulating insulin. Intramuscular (IM) injection of insulin (600 nmol/L) stimulated in situ protein synthesis similarly in 4-day unweighted (+56%) and weight-bearing (+90%) soleus, even though unweighted muscle showed a greater in situ response of 2-deoxy-[3H]glucose uptake to IM injection of either insulin (133 nmol/L) or insulin-like growth factor-I (IGF-I) (200 nmol/L) than control muscle. These findings suggest that unweighted muscle is selectively more responsive in vivo to insulin, and that the slower atrophy after 3 days of unweighting was due to an increased effect of insulin on inhibiting protein degradation.
    Keywords: Life Sciences (General)
    Type: Metabolism: clinical and experimental (ISSN 0026-0495); Volume 46; 6; 673-9
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Degradation of Teflon(tm) FEP Following Charged Particle Radiation and Rapid Thermal Cycling (1998)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: During the Second Servicing Mission (SM2) of the Hubble Space Telescope (HST) severe degradation was observed on the outer layer of the thermal control blankets. Astronaut observations and photographs revealed large cracks in the metallized Teflon(R) FEP (fluorinated ethylene propylene), the outer layer of the multi-layer insulation (MLI), in many locations around the telescope. In an effort to understand what elements of the space environment might cause such damage, pristine Teflon(R) FEP was tested for durability to radiation and thermal cycling. Specimens were subjected to electron and proton fluences comparable to those experienced by HST and were subsequently thermal cycled in a custom-built rapid thermal cycle chamber. Tensile tests of the specimens showed that radiation followed by thermal cycling significantly reduced the ultimate strength and elongation of Teflon(R) FEP.
    Keywords: Nonmetallic Materials
    Type: 20th Space Simulation Conference: The Changing Testing Paradigm; 201-209; NASA/CR-1998-208598-Preprint
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Correlation Between Bulk Material Defects and Spectroscopic Response in Cadmium Zinc Telluride Detectors (1999)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: One of the critical challenges for large area cadmium zinc telluride (CdZnTe) detector arrays is obtaining material capable of uniform imaging and spectroscopic response. Two complementary nondestructive techniques for characterizing bulk CdZnTe have been developed to identify material with a uniform response. The first technique, infrared transmission imaging, allows for rapid visualization of bulk defects. The second technique, x-ray spectral mapping, provides a map of the material spectroscopic response when it is configured as a planar detector. The two techniques have been used to develop a correlation between bulk defect type and detector performance. The correlation allows for the use of infrared imaging to rapidly develop wafer mining maps. The mining of material free of detrimental defects has the potential to dramatically increase the yield and quality of large area CdZnTe detector arrays.
    Keywords: Solid-State Physics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Degradation of Teflon(trademark) FEP Following Charged Particle Radiation and Rapid Thermal Cycling (1999)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: During the Second Servicing Mission (SM2) of the Hubble Space Telescope (HST) severe degradation was observed on the outer layer of the thermal control blankets. Astronaut observations and photographs revealed large cracks in the metallized Teflon(trademark) FEP (fluorinated ethylene propylene), the outer layer of the multi-layer insulation (MLI), in many locations around the telescope. In an effort to understand what elements of the space environment might cause such damage, pristine Teflon(trademark) FEP was tested for durability to radiation and thermal cycling. Specimens were subjected to electron and proton fluences comparable to those experienced by HST and were subsequently thermal cycled in a custom-built rapid thermal cycle chamber. Tensile tests of the specimens showed that radiation followed by thermal cycling significantly reduced the ultimate strength and elongation of Teflon(trademark) FEP.
    Keywords: Nonmetallic Materials
    Type: 20th Space Simulation Conference: The Changing Testing Paradigm; 247-255; NASA/CP-1999-208598
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Degradation of Teflon(tm) FEP Following Charged Particle Radiation and Rapid Thermal Cycling (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: During the Second Servicing Mission (SM2) of the Hubble Space Telescope (HST) severe degradation was observed on the outer layer of the thermal control blankets. Astronaut observations and photographs revealed large cracks in the metallized Teflon FEP (fluorinated ethylene propylene), the outer layer of the multi-layer insulation (MLI), in many locations around the telescope. In an effort to understand what elements of the space environment might cause such damage, pristine Teflon' FEP was tested for durability to radiation and thermal cycling. Specimens were subjected to electron and proton fluences comparable to those experienced by HST and were subsequently thermal cycled in a custom-built rapid thermal cycle chamber. Tensile tests of the specimens showed that radiation followed by thermal cycling significantly reduced the ultimate strength and elongation of Teflon FEP.
    Keywords: Nonmetallic Materials
    Type: Space Simulations; Oct 26, 1998 - Oct 29, 1998; Unknown
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Post-launch data analysis for the cosmic ray isotope experiment ONR-604 in the Combined Release and Radiation Effects Satellite (CRRES) (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research was continued on the origins, acceleration mechanisms, and the propagation modes of the hierarchy of energetic charged particles found in a wide range of astrophysical settings, extending from the cosmic rays arriving from the depth of the galaxy to the energetic particles in the heliosphere and in the near earth environment. In particular this grant has been a vital support in the investigation of the particle radiations in the earth's magnetosphere. The ONR-604 instrument was launched in July 1990 aboard the CRRES spacecraft. The CRRES mission has been a joint program of NASA and the U.S. Air Force Space Test Program which has provided launch support and telemetry coverage. The spacecraft was placed into a low-inclination eccentric orbit with a period of approximately 10 hours, and thus measured charged particle fluxes in both interplanetary space and in the earth's trapped radiation. ONR-604 performed extremely well, both in interplanetary space and in the intense radiation belt environment. We were able to make detailed measurements of interplanetary fluxes and composition into L=4, or for more than 50% of the orbital period. Thus the experiment produced two valuable datasets, one set outside of L=4 for interplanetary studies, and one set inside of L=4 for radiation belt studies. The data returned by the University of Chicago ONR-604 instrument has been the base for 10 papers on magnetospheric and galactic energetic-particle research.
    Keywords: SPACE RADIATION
    Type: NASA-CR-199450 , NAS 1.26:199450
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Mechanical Response of Elastomers to Magnetic Fields (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Elastomeric materials represent an important class of engineering materials, which are widely used to make components of structures, machinery, and devices for vibration and noise control. Elastomeric material possessing conductive or magnetic properties have been widely used in applications such as conductive and magnetic tapes, sensors, flexible permanent magnets, etc. Our interest in these materials has focussed on understanding and controlling the magnitude and directionality of their response to applied magnetic fields. The effect of magnetic fields on the mechanical properties of these materials has not been the subject of many published studies. Our interest and expertise in controllable fluids have given us the foundation to make a transition to controllable elastomers. Controllable elastomers are materials that exhibit a change in mechanical properties upon application of an external stimuli, in this case a magnetic field. Controllable elastomers promise to have more functionality than conventional elastomers and therefore could share the broad industrial application base with conventional elastomers. As such, these materials represent an attractive class of smart materials, and may well be a link that brings the applications of modern control technologies, intelligent structures and smart materials to a very broad industrial area. This presentation will cover our research work in the area of controllable elastomers at the Thomas Lord Research Center. More specifically, the presentation will discuss the control of mechanical properties and mathematical modeling of the new materials prepared in our laboratories along with experiments to achieve adaptive vibration control using the new materials.
    Keywords: Nonmetallic Materials
    Type: Proceedings of the 4th Annual Workshop: Advances in Smart Materials for Aerospace Applications; 387; NASA-CP-10185
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Degradation of Teflon(tm) FEP Following Charged Particle Radiation and Rapid Thermal Cycling (1998)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: During the Second Servicing Mission (SM2) of the Hubble Space Telescope (HST) severe degradation was observed on the outer layer of the thermal control blankets. Astronaut observations and photographs revealed large cracks in the metallized Teflon' FEP (fluorinated ethylene propylene), the outer layer of the multi-layer insulation (MLI), in many locations around the telescope. In an effort to understand what elements of the space environment might cause such damage, pristine Teflon(registered trademark) FEP was tested for durability to radiation and thermal cycling. Specimens were subjected to electron and proton fluences comparable to those experienced by HST and were subsequently thermal cycled in a custom-built rapid thermal cycle chamber. Tensile tests of the specimens showed that radiation followed by thermal cycling significantly reduced the ultimate strength and elongation of Teflon(registered trademark) FEP.
    Keywords: Nonmetallic Materials
    Type: Space Simulations; Oct 26, 1998 - Oct 29, 1998; Unknown
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Dependent Types and Explicit Substitutions (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: We present a dependent-type system for a lambda-calculus with explicit substitutions. In this system, meta-variables, subject reduction, soundness, confluence and weak normalization.
    Keywords: Computer Programming and Software
    Type: NASA/CR-1999-209722 , NAS 1.26:209722 , ICASE-99-43
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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