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  • Other Sources  (993)
  • COMPUTER PROGRAMMING AND SOFTWARE  (416)
  • MECHANICAL ENGINEERING  (358)
  • SOLAR PHYSICS
  • 1990-1994  (993)
  • 1970-1974
  • 1991  (993)
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  • Other Sources  (993)
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  • 1990-1994  (993)
  • 1970-1974
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  • 1
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    Towards automated support for extraction of reusable components (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: A cost effective introduction of software reuse techniques requires the reuse of existing software developed in many cases without aiming at reusability. This paper discusses the problems related to the analysis and reengineering of existing software in order to reuse it. We introduce a process model for component extraction and focus on the problem of analyzing and qualifying software components which are candidates for reuse. A prototype tool for supporting the extraction of reusable components is presented. One of the components of this tool aids in understanding programs and is based on the functional model of correctness. It can assist software engineers in the process of finding correct formal specifications for programs. A detailed description of this component and an example to demonstrate a possible operational scenario are given.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: ; : Strong shock waves
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  • 2
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    A microcomputer program for estimating low altitude wind and turbulence fields (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Past efforts to develop methods for objective wind analysis and to provide turbulence estimates to pilots are reviewed. The present approach involves a wind module and a turbulence module. The wind module extends the critical dividing streamline concept and past developments in mass-conserving wind interpolation schemes. The turbulence module is based on recent efforts to develop practical atmospheric turbulence parameterization schemes based on lapse rate, wind shear, surface heating, and surface roughness. The lapse rate and wind shear are readily obtained from the wind module. Surface roughness and heating come from land use information and net radiation estimates derived from cloud cover, terrain slope, local time, and latitude. This system is argued to have considerable potential for providing useful online information for many kinds of aircraft operations.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: International Conference on Aviation Weather Systems, 4th, Paris, France, June 24-28, 1991, Preprints (A93-22101 07-47); p. 295-300.
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  • 3
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    Gripper for truss structure assembly (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The CIRSSE two-finger gripper is designed to be used with a 6-axis wrist-mounted force-torque sensor as part of an experimental testbed for cooperative robotic manipulation. The gripper system consists of a dedicated controller and a pneumatic powered gripper that is servoed in position or grasping force. The gripper also has a between fingertip light beam sensor. The major features of this new design are: high grasping force to weight ratio (25::1) and compactness (14 cm base-fingertip, 0.8 kilograms); low cost dedicated slave controller; and simple host-controller communications protocol to minimize command interpretation delay. Shared software functions between the host and the controller processor permit the host to select servo mode, servo gain-parameter values, and calibration offsets. Hidden primitive self-test, calibration and servo confidence functions are included.
    Keywords: MECHANICAL ENGINEERING
    Type: Cooperative Intelligent Robotics in Space; Nov 06, 1990 - Nov 07, 1990; Boston, MA; United States
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  • 4
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    ControlShell - A real-time software framework (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: ControlShell is designed to enable modular design and impplementation of real-time software. It is an object-oriented tool-set for real-time software system programming. It provides a series of execution and data interchange mechansims that form a framework for building real-time applications. These mechanisms allow a component-based approach to real-time software generation and mangement. By defining a set of interface specifications for intermodule interaction, ControlShell provides a common platform that is the basis for real-time code development and exchange.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: IEEE International Conference on Systems Engineering, Dayton, OH, Aug. 1-3, 1991, Proceedings (A93-37026 14-63); p. 129-134.
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  • 5
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    Comparative survey of dynamic analyses of free-piston Stirling engines (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Reported dynamics analyses for evaluating the steady-state response and stability of free-piston Stirling engine (FPSE) systems are compared. Various analytical approaches are discussed to provide guidance on their salient features. Recommendations are made in the recommendations remarks for an approach which captures most of the inherent properties of the engine. Such an approach has the potential for yielding results which will closely match practical FPSE-load systems.
    Keywords: MECHANICAL ENGINEERING
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
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  • 6
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    Stirling machine operating experience (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Numerous Stirling machines have been built and operated, but the operating experience of these machines is not well known. It is important to examine this operating experience in detail, because it largely substantiates the claim that Stirling machines are capable of reliable and lengthy lives. The amount of data that exists is impressive, considering that many of the machines that have been built are developmental machines intended to show proof of concept, and were not expected to operate for any lengthy period of time. Some Stirling machines (typically free-piston machines) achieve long life through non-contact bearings, while other Stirling machines (typically kinematic) have achieved long operating lives through regular seal and bearing replacements. In addition to engine and system testing, life testing of critical components is also considered.
    Keywords: MECHANICAL ENGINEERING
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
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  • 7
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    Fine structure of the solar transition region - Observations and interpretation (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: An evaluation is conducted of recent high spatial resolution observations of the solar transition region and temperature minimum, in the form of UV spectra and spectroheliographs from both sounding rockets and the Spacelab 2 flights of the High Resolution Telescope and Spectrograph (HRTS). Attention is given to the solar atmosphere structure implications of the HRST's observational results. The inclusion of fine structure in conjectures concerning the transition region affects the plausibility of 1D average models of the solar atmosphere, as well as the determination of temperature gradients, possible nonradiative-heating mechanisms, and the comparison of transition region structures with corresponding observations of the photosphere and corona.
    Keywords: SOLAR PHYSICS
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  • 8
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    The solar spectrum (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The UV-IR solar spectrum is presented and discussed with a view to the comparative value of the data and their application in atomic or molecular spectroscopy and in solar, atmospheric, planetary, cometary, or stellar physics. Attention is given to intensity spectra, terrestrial atmospheric spectra, the 296-1300 nm Solar Flux Atlas of Kurucz et al. (1984), and line identifications.
    Keywords: SOLAR PHYSICS
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  • 9
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    The photosphere as a radiative boundary (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The present characterization of the solar photosphere as a radiative boundary for the solar interior gives attention to both semiempirical and a priori models for the structure of emergent radiation, and emphasizes that any discussion of photospheric structures smaller than 300 km is easily compromised by the radiant integration over such scale lengths. Plane-parallel modes have indicated that Boltzmann-Saha statistics are largely valid over the photosphere save within 100 km of the temperature minimum. An evaluation is made of observational evidence for horizontal inhomogeneities and such characteristics as granular and temperature minimum region fluctuations, as well as the recent demonstration of relatively cold CO-absorbing regions.
    Keywords: SOLAR PHYSICS
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  • 10
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    Probabilistic simulation of fragment dynamics and their surface impacts in the SSME turbopump (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Numerical simulations are used to model the dynamics of solid fragments in the high-pressure fuel turbopump of the Space Shuttle Main Engine (SSME HPFTP). The simulations are conducted in a probabilistic structure in order to simulate the variance in the geometrical configuration, material properties and initial conditions of the solid fragments. The results of the particle dynamics simulations are presented in the form of the probability of surface impacts, and probability distributions of the impacting velocity and impingement angle.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME and JSME Joint Fluids Engineering Conference; Jun 23, 1991 - Jun 27, 1991; Portland, OR; United States
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