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Saturday, August 1, 2020 | History

3 edition of Surface characterization of LDEF materials found in the catalog.

Surface characterization of LDEF materials

Surface characterization of LDEF materials

final technical report

  • 301 Want to read
  • 12 Currently reading

Published by Virginia Tech Chemistry Dept., National Aeronautics and Space Administration, National Technical Information Service, distributor in Blacksburg, VA, [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Materials -- Effect of space environment on.

  • Edition Notes

    Statementprincipal investigator: J.P. Wightman.
    Series[NASA contractor report] -- NASA CR-194519., NASA contractor report -- NASA CR-194519.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14698607M

      Even if the oxidizing, cold, and radiation-exposed surface of Mars is quite hostile, there are some regions on Mars (e.g., the subsurface) that could enable the existence of life. Recent experiments have shown that strictly anaerobic methanogenic archaea are able to grow on Mars soil simulant (21).Cited by: The lack of information on how biological systems respond to low-dose and low dose-rate exposures makes it difficult to accurately assess the carcinogenic risks. This is of critical importance to space radiation, which remains a serious concern for long-term manned space exploration. In this study, the γ-H2AX foci assay was used to follow DNA double-strand break (DSB) induction and repair Author: Shankari Nair, Monique Engelbrecht, Xanthene Miles, Roya Ndimba, Randall Fisher, Peter du Plessis, J.

    The influence of irradiation on mechanical properties of polymer foils used in spacecraft applications has widely been studied via macroscopic tensile samples. An increase in the local resolution of this investigation can be achieved by reducing the sample’s dimensions. A femtosecond laser enables a fast fabrication of micro-samples with dimensions from tens of μ m to the mm range Author: Manuel J. Pfeifenberger, Gabor Milassin, Anton Hohenwarter, Barbara Putz, Christopher O. A. Semprimo. "Seven percent of a normal solar mass contains nearly 2 X 10 51 iron atoms. The total number of admixed protons is of the order of 4 X 10 Almost all of these are converted to neutrons by the 12 C(p,γ) 13 N(e + ν) 13 C and 13 C(α,n) 16 O reactions. Since significant synthesis of heavy elements requires the production of 2 neutrons per iron nucleus (Clayton et al. ; Seeger.

    Fo re w o rd At NASA’s Langley Research Center, we are proud to carry forward a legacy of innovation and technical excellence. This pictorial history, our th Anniversary book, uses images to. The Meteoroid Impact Detection for Exploration of Asteroids concept addresses the challenge of characterizing an asteroid surface using a small satellite with a constellation of free-flying plasma sensors. The sensors detect ions ejected from the surface of an asteroid by meteoroid impacts, enabling the surface composition to be by: 1.


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Surface characterization of LDEF materials Download PDF EPUB FB2

Get this from a library. Surface characterization of LDEF materials: final technical report. [James P Wightman; United States. National Aeronautics and Space Administration.]. Results of a space program that involved ground-based testing, characterization, and durability evaluation of advanced thermal-control polymer-based materials and black and white thermal control paints with organic binders are presented.

The materials have been treated by different variants of Photosil™, a patented surface modification Cited by: 2. A small percentage of debris in orbit is tracked and cataloged.

The orbital parameters (e.g., period, inclination, apogee, and perigee) of these objects are entered into a catalog, generally along with information on the object's origin—only objects with known origins are entered into the catalog—and its radar or optical cross section. The National Aeronautics and Space Administration's Long Duration Exposure Facility (LDEF) provided a unique environmental exposure of a wide variety of materials.

The effects of 5 years and 9 months of low-Earth orbit (LEO) exposure of these materials to atomic oxygen (AO), ultraviolet and particulate radiation, meteorid and debris, vacuum, contamination, and thermal cycling is providing a. The Long Duration Exposure Facility (LDEF) was retrieved in after spending 69 months in low-earth-orbit (LEO).

A wide variety of mechanical, electrical, thermal, and optical systems. Surface characterization of polymers may be accomplished by many methods such as analysis by x‐ray photoelectron spectroscopy, (XPS), and static secondary ion mass spectrometry, (SSIMS).

The effects of AO flux and the space environment on several hundred different materials have been investigated in three Space Shuttle experiments, one satellite recovery (Long Duration Exposure Facility, LDEF), experiments aboard Russia's Mir Space Station, servicing missions on the Hubble Space Telescope, and observations on the ISS [5,7,9 Cited by: 4.

Full text of "LDEF: 69 Months in Space. Third Post-Retrieval Symposium, part 2" See other formats. Young PR, Slemp WS, Whitley KS, Kalil CR, Siochi EJ, Shen JY, Chang AC () LDEF polymeric materials: A summary of Langley characterization.

NASA Conf Publ (Pt 2 LDEF Months in Space), pp – Google ScholarCited by:   Aerospace Materials and Material Technologies: Volume 1: Aerospace Materials - Ebook written by N.

Eswara Prasad, R. Wanhill. Read this book using Google Play Books app on your PC, android, iOS devices. Download for offline reading, highlight, bookmark or take notes while you read Aerospace Materials and Material Technologies: Volume 1: Aerospace Materials.

Joe's practice includes intellectual property due diligence, Patent Office appeals, preparation and prosecution of patent applications, and counseling on patent strategy, patent infringement and licensing issues. He represents clients in a wide range of technologies, including chemicals, polymers, pharmaceuticals, materials science, adhesives, coatings, composite materials, medical devices.

In the orbits nearest to Earth—less than 2, km (1, mi) orbital altitude, referred to as low-Earth orbit (LEO)— there have traditionally been few "universal orbits" which keep a number of spacecraft in particular rings (in contrast to GEO, a single orbit that is widely used by over satellites).This is beginning to change inand several companies have begun to deploy the.

@article{osti_, title = {Surface analysis of residual contaminants from dye-penetrant testing}, author = {Seals, R. and Richards, H. and Cristy, S. and Killeen, O. P.}, abstractNote = {Residual contamination on metal surfaces (U Ti, aluminum, and steel) attributed to components from dye-penetrant testing was evaluated using ESCA and IMMA analyses.

The hazard to space operations from debris is a function of the nature of those operations and the orbital region in which they take place. The orbital region is important because the debris flux encountered by a spacecraft varies greatly with orbital altitude and, to a lesser extent, orbital.

This book is based on lectures held at the faculty of mechanical engineering at the Technical University of Kaiserslautern. The focus is on the central theme of societies overall aircraft requirements to specific material requirements and highlights the most important advantages and challenges of carbon fiber reinforced plastics (CFRP) compared to conventional materials.

The degradation of two epoxy composites, in three laminates, following exposure to atomic oxygen, was studied. • Samples were exposed to a total fluence of × 10 20 atom/cm 2, equating to 43 days in low Earth orbit.

The flexural rigidity and modulus of all laminates displayed a reduction of 5–10% after first exposure (equivalent to 20 days in orbit).Cited by: 2.

Bonnie Jeanne Dunbar (born March 3, ) is a former NASA retired from NASA in September then served as president and CEO of The Museum of Flight until April From January - DecemberDr. Dunbar lead the University of Houston's STEM Center (science, technology, engineering and math) and was a faculty member in the Cullen College of : March 3, (age 70), Sunnyside, Washington.

of the organic stain on LDEF. Figures 6 and 7 show the stain on the trailing edge (row 3) of LDEF. Figures 8 and 9 show a much fainter stain on the leading edge (ram direction=row 9) of LDEF.

But Figu 11, 12, and 13 show the heaviest deposits on end plates surface near vents from the interior. Proc. SPIERough Surface Scattering and Contamination, pg 4 (25 October ); doi: / Read Abstract + The return of the Long Duration Exposure Facility (LDEF) in brought a wealth of space exposure data on materials, paints, solar cells, etc.

and data on the many space environments. The data from the fourth Satellite Orbital Debris Characterization Impact Test (SOCIT 4) 4 reveals that most of the small fragments in the cm to mm regime consist of the medium-density materials: 2 aluminum, titanium, and paint.

The majority of the steel fragments were larger than the specified size scope and most polymer fragments were by: 9. Materials selection — case studies Introduction and synopsis Materials for oars Mirrors for large telescopes Materials for table legs Cost: structural material for buildings Materials for flywheels Materials for springs Elastic hinges and couplings Materials for seals Deflection-limited design with.Full text of "Modeling of Transmittance Degradation Caused by Optical Surface Contamination by Atomic Oxygen Reaction with Adsorbed Silicones" See other formats NASA/TM— W^, Modeling of Transmittance Degradation Caused by Optical Surface Contamination by Atomic Oxygen Reaction With Adsorbed Silicones Aaron Snyder, Bruce Banks, and Sharon Miller Glenn Research Center, Cleveland.American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA