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  • 1
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    NASA/JSC orbital debris study: Debris model (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The possibility of the creation of a debris belt around the Earth is discussed. A computer model which describes the near-Earth space environment created by the existing spacecraft and fragments from the associated spent launching vehicle attachments and explosions was developed. The present debris model adopts the mathematical formulations published in a paper by Kessler. Thus, the model uses more rigorous mathematical formulation in calculating the collision rate between two orbiting objects than the one published by Kessler and Cour-Palais (1978). The present model contains many general but detailed analyses on the debris environment such as manipulating and/or sorting the existing debris objects, the physical dimensions of the objects and extrapolating the number density describing to include the unobservable small objects.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Orbital Debris; p 69-77
    Format: text
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  • 2
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    Timing observations of the Crab Nebula pulsar at the Arecibo Observatory (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Crab Nebula pulsar NP0532 radio observations, noting long term slowing down and irregular perturbations in periodicity
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
    Format: text
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  • 3
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    Neonlike Ar and Cl 3p-3s emission from a theta-pinch plasma (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Time-resolved extreme-UV emission from sixteen 3p-3s transitions, some of the type in which lasing has been demonstrated in heavier elements, is measured for neonlike Ar(8+) and Cl(7+). These observations are made on a hydrogen theta-pinch plasma with a 5 pct admixture of argon or freon (for Cl). Fourteen 3d-3p spectral lines are also detected. The measured intensities are compared to theoretical predictions. There is no evidence of anomalously intense lines originating on 2p5 3p J = 2 upper levels compared to J = 0, as observed in gain experiments.
    Keywords: LASERS AND MASERS
    Type: Physical Review A - General Physics, 3rd Series (ISSN 0556-2791); 40; 4142-414
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  • 4
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    Nonphosphorylating respiration of mitochondria from brown adipose tissue of rats. (1966)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Nonphosphorylating respiration of mitochondria from brown adipose tissue of rats, providing example of electron transport
    Keywords: BIOSCIENCES
    Type: SCIENCE
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  • 5
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    Composite,Cryogenic, Conformal, Common Bulkhead, Aerogel-Insulated Tank (CBAT) (2001)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The objective of the Composite, Cryogenic, Conformal, Common Bulkhead, Aerogel-insulated Tank (CBAT) Program is to evaluate the potential for using various new technologies in next generation Reusable Launch Vehicles (RLVs) through design, fabrication, and testing of a subscale system. The new technologies include polymer matrix composites (PMCs), conformal propellant storage, common bulkhead packaging, and aerogel insulation. The National Aeronautics and Space Administration (NASA) and Thiokol Propulsion from Cordant Technologies are working together to develop a design and the processing methodologies which will allow integration of these technologies into a single structural component assembly. Such integration will significantly decrease subsystem weight and reduce shape, volume, and placement restrictions, thereby enhancing overall launch system performance. This paper/presentation focuses on the challenges related to materials and processes that were encountered and overcome during this program to date.
    Keywords: Composite Materials
    Type: Proceedings of The 4th Conference on Aerospace Materials, Processes, and Environmental Technology; NASA/CP-2001-210427
    Format: application/pdf
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  • 6
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    Performance of an electromagnetic bearing for the vibration control of a supercritical shaft (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The flexural vibrations of a rotating shaft, running through one or more critical speeds, can be reduced to an acceptably low level by applying suitable control forces at an intermediate span position. If electromagnets are used to produce the control forces then it is possible to implement a wide variety of control strategies. A test rig is described which includes a microprocessor-based controller, in which such strategies can be realised in terms of software-based algorithms. The electromagnet configuration and the method of stabilising the electromagnet force-gap characteristic are discussed. The bounds on the performance of the system are defined. A simple control algorithm is outlined, where the control forces are proportional to the measured displacement and velocity at a single point on the shaft span; in this case the electromagnet behaves in a similar manner to that of a parallel combination of a linear spring and damper. Experimental and predicted performance of the system are compared, for this type of control, where various programmable rates of damping are applied.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Lewis Research Center Rotordynamic Instability Problems in High-Performance Turbomachinery, 1986; p 431-460
    Format: application/pdf
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  • 7
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    Estimation of squeeze-film damping and inertial coefficients from experimental free-decay data (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The results are given for an experimental program concerned with a parametric identification of the damping and inertial coefficients of a cylindrical squeeze-film bearing, through an analysis of transient response data. The results enable the operating range for which a linear model of the squeeze-film is appropriate to be determined. Comparisons are made between the estimated coefficients and theoretical predictions. Presentation is by courtesy of the Council of the Institution of Mechanical Engineers, London.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Lewis Research Center Rotordynamic Instability Problems in High-Performance Turbomachinery, 1986; p 293-314
    Format: application/pdf
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  • 8
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    Real-time dynamic simulation of the Cassini spacecraft using DARTS. Part 2: Parallel/vectorized real-time implementation (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Part 1 of this paper presented the requirements for the real-time simulation of Cassini spacecraft along with some discussion of the DARTS algorithm. Here, in Part 2 we discuss the development and implementation of parallel/vectorized DARTS algorithm and architecture for real-time simulation. Development of the fast algorithms and architecture for real-time hardware-in-the-loop simulation of spacecraft dynamics is motivated by the fact that it represents a hard real-time problem, in the sense that the correctness of the simulation depends on both the numerical accuracy and the exact timing of the computation. For a given model fidelity, the computation should be computed within a predefined time period. Further reduction in computation time allows increasing the fidelity of the model (i.e., inclusion of more flexible modes) and the integration routine.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Proceedings of the Fifth NASA(NSF)DOD Workshop on Aerospace Computational Control; p 307-326
    Format: application/pdf
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  • 9
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    Nonelastic strain recovery of copper single crystals after small prestrains. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Total nonelastic strain recovery of copper single crystals after small prestrains, discussing parameters
    Keywords: MATERIALS, METALLIC
    Format: text
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  • 10
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    Effect of altitude on oxygen consumption of deer mice - Relation of temperature and season. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Altitude effect on metabolic rates of deer mice, noting direct relationship between seasons and metabolic rate at all ambient temperatures
    Keywords: BIOSCIENCES
    Type: CANADIAN JOURNAL OF ZOOLOGY
    Format: text
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