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  • METALLIC MATERIALS  (7)
  • Polymer and Materials Science  (5)
  • Electronics and Electrical Engineering  (4)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 2299-2303 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 1619-1631 
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The total absorption spectrum of the UV absorber sodium 2-(2′-hydroxy-5′-methylphenyl) benzotriazole sulfonate (TINS) has been resolved into contributions by two ground-state forms in acetonitrile-water solvent mixtures and hydrogen bonding polymer and protein substrates. These two ground-state species can be assigned to (i) a planar intramolecularly hydrogen bonded form which can undergo the efficient nonradiative energy dissipation process of excited-state intramolecular proton transfer (ESIPT), and (ii) a fluorescent nonplanar species in which ESIPT is effectively prevented. The mole fractions of each contributing conformer in the polymeric substrates have been estimated. In all the polymer systems studied, a significant proportion of the TINS molecules exist in the nonplanar form and thus may not contribute to photostabilization of the substrate. The proportion of nonplanar molecules varied from 11 to 86% in synthetic polymers and 20 to 41% in protein substrates.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 26 (1988), S. 505-510 
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 1020-1033 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In der Hoffnung, daß sich einige Irrtümer in Zukunft vermeiden lassen, werden Probleme erörtert, die mit den verschiedenen Methoden zur Prüfung der Spannungskorrosion verbunden sind, ohne dabei jedoch einen Katalog von Prüfmethoden geben zu wollen. So kann z.B. die Zeit bis zum Bruch als Meßgröße für die Empfindlichkeit zu falschen Schlußfolgerungen führen, während andererseits der Konstrukteur irregeführt werden kann, wenn er nicht darüber informiert ist, daß KIscc-Werte, wie sie mitunter aus Versuchen an angerissenen Prüfkörpern bestimmt werden, nicht so gut reproduzierbar sind wie die Konstruktionsgrößen, z. B. Streckgrenze oder Zugfestigkeit, die ihm geläufiger sind. Andere Größen, die zu Unterschieden zwischen den in verschiedenen Laboratorien erzielten Ergebnissen führen können, sind die Auswirkungen der Probenoberfläche und ihr Verhältnis zum Volumen der Prüflösung sowie die Oberflächenendbearbeitung. Auf ähnliche Weise werden hinsichtlich der Umgebungsbedingungen bei der Prüfung die Gefahren aufgezeigt, die in der Verwendung von „Standard“-Lösungen liegen. Ebenso wird auf die Notwendigkeit hingewiesen, bei der Nachahmung von betrieblichen Schadensfällen die Zusammensetzung der Angriffsmittel sowie die entsprechenden Elektrodenpotentiale genauestens nachzubilden; die Bedeutung anderer Faktoren wird gleichfalls dargelegt.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2013-08-31
    Description: A program is described which seeks to develop an understanding of the effects of dissolved and trapped hydrogen on the mechanical properties of selected Al-Li-Cu-X alloys. A proposal is made to distinguish hydrogen (H2) induced EAC from aqueous dissolution controlled EAC, to correlate H2 induced EAC with mobile and trapped concentrations, and to identify significant trap sites and hydride phases (if any) through use of model alloys and phases. A literature review shows three experimental factors which have impeded progress in the area of H2 EAC for this class of alloys. These are as listed: (1) inter-subgranular fracture in Al-Li alloys when tested in the S-T orientation in air or vacuum make it difficult to readily detect H2 induced fracture based on straight forward changes in fractography; (2) the inherently low H2 diffusivity and solubility in Al alloys is further compounded by a native oxide which acts as a H2 permeation barrier; and (3) H2 effects are masked by dissolution assisted processes when mechanical testing is performed in aqueous solutions.
    Keywords: METALLIC MATERIALS
    Type: NASA-UVA Light Aerospace Alloy and Structures Technology Program (LA2ST); p 173-197
    Format: application/pdf
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  • 7
    Publication Date: 2019-07-13
    Description: The NASA-UVa Light Aerospace Alloy and Structures Technology (LA2ST) Program was initiated in 1986 and continues with a high level of activity. Projects are being conducted by graduate students and faculty advisors in the Department of Materials Science and Engineering, as well as in the Department of Civil Engineering and Applied Mechanics, at the University of Virginia. Here, we report on progress achieved between July 1 and December 31, 1994. The objective of the LA2ST Program is to conduct interdisciplinary graduate student research on the performance of next generation, light-weight aerospace alloys, composites and thermal gradient structures in collaboration with NASA-Langley researchers. Specific technical objectives are presented for each research project. We generally aim to produce relevant data and basic understanding of material mechanical response, environmental/corrosion behavior, and microstructure; new monolithic and composite alloys; advanced processing methods; new solid and fluid mechanics analyses; measurement and modeling advances; and a pool of educated graduate students for aerospace technologies.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-198041 , NAS 1.26:198041 , UVA/528266/MSE94/117
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  • 8
    Publication Date: 2019-07-13
    Description: The objective of the LA2ST Program is to conduct interdisciplinary graduate student research on the performance of next generation, light-weight aerospace alloys, composites, and thermal gradient structures in collaboration with NASA-Langley researchers. The general aim is to produce relevant data and basic understanding of material mechanical response, environment/corrosion behavior, and microstructure; new monolithic and composite alloys; advanced processing methods; new solid and fluid mechanics analyses; measurement and modeling advances; and a pool of educated students for aerospace technologies. Specific technical objectives are presented for each of the following research projects: time-temperature dependent fracture in advanced wrought ingot metallurgy, and spray deposited aluminum alloys; cryogenic temperature effects on the deformation and fracture of Al-Li-Cu-In alloys; effects of aging and temperature on the ductile fracture of AA2095 and AA2195; mechanisms of localized corrosion in alloys 2090 and 2095; hydrogen interactions in aluminum-lithium alloys 2090 and selected model alloys; mechanisms of deformation and fracture in high strength titanium alloys (effects of temperature and hydrogen and effects of temperature and microstructure); evaluations of wide-panel aluminum alloy extrusions; Al-Si-Ge alloy development; effects of texture and precipitates on mechanical property anisotropy of Al-Cu-Mg-X alloys; damage evolution in polymeric composites; and environmental effects in fatigue life prediction - modeling crack propagation in light aerospace alloys.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-198914 , NAS 1.26:198914 , UVA/528266/MS95/118
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  • 9
    Publication Date: 2019-07-13
    Description: This report documents an investigation into observed failures associated with conducted susceptibility testing of Crew Quarters (CQ) hardware in the Johnson Space Center (JSC) Electromagnetic Interference (EMI) Measurement Facility, and the work accomplished to identify the source of the observed behavior. Investigation led to the conclusion that the hardware power input impedance was interacting with the facility power impedance leading to instability at the observed frequencies of susceptibility. Testing performed in other facilities did not show this same behavior, pointing back to the EMI Measurement Facility power as the potential root cause. A LISN emulating the Station power bus impedance was inserted into the power circuit, and the susceptibility was eliminated from the measurements.
    Keywords: Electronics and Electrical Engineering
    Type: JSC-CN-23221 , 2011 IEEE International Symposium on Electromagnetic Compatibility; Aug 14, 2011 - Aug 19, 2011; Long Beach, CA; United States
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  • 10
    Publication Date: 2019-07-13
    Description: The general objective of the NASA-UVa Light Aerospace Alloy and Structures Technology Program was to conduct research on the performance of next generation, light weight aerospace alloys, composites, and associated thermal gradient structures. The following research areas were actively investigated: (1) mechanical and environmental degradation mechanisms in advanced light metals and composites; (2) aerospace materials science; (3) mechanics of materials and composites for aerospace structures; and (4) thermal gradient structures.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-187895 , NAS 1.26:187895 , UVA/528266/MS91/107
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