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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 2001-2006 
    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
    Notes: Nitric acid digestion studies of ethylene-vinyl acetate copolymers indicated that copolymers containing identical amounts of vinyl acetate but varying in melt index differed in crystallinity. These results were confirmed by x-ray analysis. The differences in crystallinity were interpreted as showing a variation in the degree of short-chain branching in the polyethylene segments of the copolymer chain. This variation was correlated with the conditions of synthesis.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 376 (1970), S. 11-27 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A wolfram wire is glowing in an inert gas of atmospheric pressure, containing very small concentrations of oxygen (N2 + O2; CO + CO2). The temperatures of the wire are 1500-3500°K. All the observations, that means the inversion of the transport direction of W in a temperature gradient at about 2800°K, the sharp decrease of W-“vaporization” below 1600°K and the approximate amount of W-vaporization can be understood if one assumes a thermodynamic equilibrium with species O1, O2, W1, WO2, WO3, W3O9, W4O12 on the surface of the wire.
    Notes: Ein Wolframdraht glüht in Inertgas von Atmosphärendruck, das sehr kleine Konzentrationen an Sauerstoff enthält (N2 + O2; CO + CO2). Die Glühdrahttemperaturen liegen zwischen 1500 und 3500°K. Alle Beobachtungen, nämlich die Umkehrung der Transportrichtung des Wolframs im Temperaturgradienten bei ∼2800°K, der besonders steile Abfall der verflüchtigten Wolframmenge unterhalb 1600°K und die Größenordnung der Wolframverflüchtigung lassen sich deuten, wenn man zugrunde legt, daß an der Drahtoberfläche thermodynamische Gleichgewichte herrschen, an denen die Molekeln O1, O2, W1, WO1, WO2, WO3, W3O9, W4O12 beteiligt sind.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 180 (1979), S. 633-647 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Bromodifluoroacetaldehyde (5) was prepared from methyl bromodifluoroacetate (4) by reduction with lithium aluminium hydride. 4 was in turn prepared by bromination of chlorotrifluoroethylene (1) and treatment of the resulting 1,2-dibromo-1-chlorotrifluoroethane (2) with fuming H2SO4 and HgO. 5, properly purified, could be polymerized with anionic and cationic initiators to poly[oxy-2-(bromodifluoro)ethylidene] (12). Certain initiators produce partially or entirely amorphous soluble 12 of relatively low molecular weight. Most polymers, however, are insoluble, crystalline, and presumably isotactic. Thermal vacuum degradation of the polymers 12 gave monomer 5 in essentially quantitative yield. The thermal stability of polymers can significantly be improved by endcapping or treating with agents which replace unstable end groups. The ceiling temperature of the polymerization of 5 was determined to be +48°C. 5 was copolymerized with trichloroacetaldehyde with cationic or anionic initiators to copolymers containing predominantly units of 5. 5 could also be copolymerized with phenyl isocyanate to a polymer containing oxycarbamido linkages.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 16 (1991), S. 255-265 
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The quasi-static compaction behavior of a number of single- and double-base ball propellants has been investigated to determine the effect of nitroglycerin (NG) content. Simultaneous measurements were obtained of axial applied and transmitted forces, circumferential strain, and porous bed displacement, resulting in the calculation of axial average solid stress and radial stress as a function of porous bed consolidation. Five Olin ball propellants designated as WC140, TS3660, TS3659, Winchester #231, and TS3661 in order of increasing NG content, were compacted. Their NG concentrations ranged from 0 to ∼35 wt%. The most significant effects of increased NG content were to decrease the various axial and radial stress levels present at constant degree of bed consolidation and to increase the coefficient of kinetic friction at the porous bed/mold wall interface. Microscopic examination of recovered samples that had been compacted revealed that extensive plastic deformation occurred in the absence of particle fracture.
    Additional Material: 11 Ill.
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  • 5
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2018-02-23
    Keywords: Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2011-08-19
    Description: To ensure the reliability and performance of a new system, it must be verified or validated in some manner. Currently, testing is the only resonable technique available for doing this. Part of this testing process is the high level system test. System testing is considered with respect to operating systems and in particular UNIX. This consideration results in the development and presentation of a good method for performing the system test. The method includes derivations from the system specifications and ideas for management of the system testing project. Results of applying the method to the IBM System/9000 XENIX operating system test and the development of a UNIX test suite are presented.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Goddard Space Flight Center Proceedings of the Ninth Annual Software Engineering Workshop; p 136-167
    Format: text
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  • 7
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    In:  CASI
    Publication Date: 2019-06-28
    Description: The design and construction of embedded operating systems for real-time advanced aerospace applications was investigated. The applications require reliable operating system support that must accommodate computer networks. Problems that arise in the construction of such operating systems, reconfiguration, consistency and recovery in a distributed system, and the issues of real-time processing are reported. A thesis that provides theoretical foundations for the use of atomic actions to support fault tolerance and data consistency in real-time object-based system is included. The following items are addressed: (1) atomic actions and fault-tolerance issues; (2) operating system structure; (3) program development; (4) a reliable compiler for path Pascal; and (5) mediators, a mechanism for scheduling distributed system processes.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-176280 , NAS 1.26:176280
    Format: application/pdf
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  • 8
    Publication Date: 2019-06-28
    Description: The current work in progress for the SAGA project are described. The highlights of this research are: a parser independent SAGA editor, design for the screen editing facilities of the editor, delivery to NASA of release 1 of Olorin, the SAGA parser generator, personal workstation environment research, release 1 of the SAGA symbol table manager, delta generation in SAGA, requirements for a proof management system, documentation for and testing of the cyber pascal make prototype, a prototype cyber-based slicing facility, a June 1984 demonstration plan, SAGA utility programs, summary of UNIX software engineering support, and theorem prover review.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-173206 , NAS 1.26:173206
    Format: application/pdf
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  • 9
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    In:  CASI
    Publication Date: 2019-06-28
    Description: This progress report describes research towards the design and construction of embedded operating systems for real-time advanced aerospace applications. The applications concerned require reliable operating system support that must accommodate networks of computers. The report addresses the problems of constructing such operating systems, the communications media, reconfiguration, consistency and recovery in a distributed system, and the issues of realtime processing. A discussion is included on suitable theoretical foundations for the use of atomic actions to support fault tolerance and data consistency in real-time object-based systems. In particular, this report addresses: atomic actions, fault tolerance, operating system structure, program development, reliability and availability, and networking issues. This document reports the status of various experiments designed and conducted to investigate embedded operating system design issues.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-173438 , NAS 1.26:173438
    Format: application/pdf
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  • 10
    Publication Date: 2019-07-13
    Description: The EOS project is investigating the design and construction of a family of real-time distributed embedded operating systems for reliable, distributed aerospace applications. Using the real-time programming techniques developed in co-operation with NASA in earlier research, the project staff is building a kernel for a multiple processor networked system. The first six months of the grant included a study of scheduling in an object-oriented system, the design philosophy of the kernel, and the architectural overview of the operating system. In this report, the operating system and kernel concepts are described. An environment for the experiments has been built and several of the key concepts of the system have been prototyped. The kernel and operating system is intended to support future experimental studies in multiprocessing, load-balancing, routing, software fault-tolerance, distributed data base design, and real-time processing.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-179874 , NAS 1.26:179874
    Format: application/pdf
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