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  • 1
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    Acetylene terminated matrix resins (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The synthesis of resins with terminal acetylene groups has provided a promising technology to yield high performance structural materials. Because these resins cure through an addition reaction, no volatile by-products are produced during the processing. The cured products have high thermal stability and good properties retention after exposure to humidity. Resins with a wide variety of different chemical structures between the terminal acetylene groups are synthesized and their mechanical properties studied. The ability of the acetylene cured polymers to give good mechanical properties is demonstrated by the resins with quinoxaline structures. Processibility of these resins can be manipulated by varying the chain length between the acetylene groups or by blending in different amounts of reactive deluents. Processing conditions similar to the state-of-the-art epoxy can be attained by using backbone structures like ether-sulfone or bis-phenol-A. The wide range of mechanical properties and processing conditions attainable by this class of resins should allow them to be used in a wide variety of applications.
    Keywords: COMPOSITE MATERIALS
    Type: NASA. Lewis Research Center High Temp. Polymer Matrix Composites; p 1-9
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  • 2
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    Magnetic susceptibility of Inconel alloys 718, 625, and 600 at cryogenic temperatures (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: After a hydrogen fuel bleed valve problem on the Discovery Space Shuttle was traced to the strong magnetization of Inconel 718 in the armature of the linear variable differential transformer near liquid hydrogen temperatures, the ac magnetic susceptibility of three samples of Inconel 718 of slightly different compositions, one sample of Inconel 625, and on sample of Inconel 600 were measured as a function of temperature. Inconel 718 alloys are found to exhibit a spin glass state below 16 K. Inconel 600 exhibits three different magnetic phases, the lowest-temperature state (below 6 K) being somewhat similar to that of Inconel 718. The magnetic states of the Inconel alloys and their magnetic susceptibilities appear to be strongly dependent on the exact composition of the alloy.
    Keywords: METALLIC MATERIALS
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  • 3
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    A low-cost polysilicon process based on the synthesis and decomposition of dichlorosilane (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Major process steps of a dichlorosilane based chemical vapor deposition (CVD) process for the production of polycrystalline silicon have been evaluated. While an economic analysis of the process indicates that it is not capable of meeting JPL/DOE price objectives ($14.00/kg in 1980 dollars), product price in the $19.00/kg to $25.00/kg range may be achieved. Product quality has been evaluated and ascertained to be comparable to semiconductor-grade polycrystalline silicon. Solar cells fabricated from the material are also equivalent to those fabricated from semiconductor-grade polycrystalline silicon.
    Keywords: SOLID-STATE PHYSICS
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  • 4
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    Feasibility study of an Integrated Program for Aerospace vehicle Design (IPAD). Volume 4: IPAD system design (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The computing system design of IPAD is described and the requirements which form the basis for the system design are discussed. The system is presented in terms of a functional design description and technical design specifications. The functional design specifications give the detailed description of the system design using top-down structured programming methodology. Human behavioral characteristics, which specify the system design at the user interface, security considerations, and standards for system design, implementation, and maintenance are also part of the technical design specifications. Detailed specifications of the two most common computing system types in use by the major aerospace companies which could support the IPAD system design are presented. The report of a study to investigate migration of IPAD software between the two candidate 3rd generation host computing systems and from these systems to a 4th generation system is included.
    Keywords: AERODYNAMICS
    Type: NASA-CR-132394 , D6-60181-4
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  • 5
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    Effects of dc bias on the fabrication of amorphous GdCo RF sputtered films (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An investigation has been conducted on the effects of a dc bias field applied to Gd(1-x)Co(x) thin films during RF sputter deposition. Such films may possess uniaxial magnetic anisotropy with easy axis perpendicular to the plane of the film and may be used in magnetic bubble devices. Uniformity in composition, thickness and magnetic properties has been achieved and film composition has been controlled to within one percent. However, significant variations of magnetic properties were observed from film to film.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
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  • 6
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    Efficient Process for Making Polycrystalline Silicon (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Solar cells made with lower capital and operating costs. Process based on chemical-vapor deposition (CVD) of dichlorosilane produces high-grade polycrystalline silicon for solar cells. Process has potential as cost-effective replacement for CVD of trichlorosilane.
    Keywords: MATERIALS
    Type: NPO-16121 , NASA Tech Briefs (ISSN 0145-319X); 9; 1; P. 104
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  • 7
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    Development of a Tele-Micro-Robot for Telemanipulation of a Microscopic Environment (1998)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: The objective of the proposed work was to design and develop the mechanical equivalent of a stereomicroscope in order to eliminate the mismatch that currently exists between one's ability to observe a microscopic environment and one's ability to manipulate it.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
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  • 8
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    Minimum surface-effect microgripper design for force-reflective telemanipulation of a microscopic environment (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: This paper describes the fundamental physical motivations for a minimum surface effect design, and presents a microgripper that incorporates a piezoelectric ceramic actuator and a flexure-based structure and transmission. The microgripper serves effectively as a one degree-of-freedom prototype of a minimum surface effect micromanipulator design. Data is presented that characterizes the microgripper performance under both pure position and pure force control, followed by a discussion of the attributes and limitations of flexure-based design. The microgripper is interfaced with a force reflective macrogripper, and the pair is controlled with a hybrid position/force scheme. Data is presented that illustrates the effective operation of the telerobotic pair.
    Keywords: Mechanical Engineering
    Type: NASA-CR-201478 , NAS 1.26:201478
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  • 9
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    Design of a Minimum Surface-Effect Tendon-Based Microactuator for Micromanipulation (1997)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A piezoelectric (PZT) stack-based actuator was developed to provide a means of actuation with dynamic characteristics appropriate for small-scale manipulation. In particular, the design incorporates a highly nonlinear, large-ratio transmission that provides approximately two orders of magnitude motion amplification from the PZT stack. In addition to motion amplification, the nonlinear transmission was designed via optimization methods to distort the highly non-uniform properties of a piezoelectric actuator so that the achievable actuation force is nearly constant throughout the actuator workspace. The package also includes sensors that independently measure actuator output force and displacement, so that a manipulator structure need not incorporate sensors nor the associated wires. Specifically, the actuator was designed to output a maximum force of at least one Newton through a stroke of at least one millimeter. For purposes of small-scale precision position and/or force control, the actuator/sensor package was designed to eliminate stick-slip friction and backlash. The overall dimensions of the actuator/sensor package are approximately 40 x 65 x 25 mm.
    Keywords: Cybernetics
    Type: NASA-CR-205001 , NAS 1.26:205001 , Robotics and Automation; Apr 01, 1997; Albuquerque, NM; United States|Proceedings of the 1997 IEEE International Conference on Robotics and Automation; 1460-1465
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  • 10
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    Minimum Surface-Effect Microgripper Design for Force-Reflective Telemanipulation of a Microscopic Environment (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: This paper describes the fundamental physical motivations for minimum surface effect design, and presents a microgripper that incorporates a piezoelectric ceramic actuator and a flexure-based structure and transmission. The microgripper serves effectively as a one degree-of-freedom prototype of minimum surface effect micromanipulator design. Data is presented that characterizes the microgripper performance under both pure position and pure force control, followed by a discussion of the attributes and limitations of flexure-based design. The microgripper is interfaced with a force-reflective macrogripper, and the pair controlled with a hybrid position/force scheme. Data is presented that illustrates the effective operation of the telerobotic pair.
    Keywords: Earth Resources and Remote Sensing
    Type: NASA-CR-205012 , NAS 1.26:205012 , Proceedings of the ASME Dynamics Systems and Control Division; 58; 477-482
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