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  • 1
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    Picosecond coherent anti-Stokes Raman scattering (CARS) study of vibrational dephasing of carbon disulfide and benzene in solution (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The vibrational dephasing of the 656/cm mode (nu1, a1g) of CS2 and the 991/cm mode (nu2, a1g) of benzene have been studied as a function of concentration in mixtures with a number of solvents using a ps time-resolved CARS technique. This technique employs two tunable synchronously-pumped mode-locked dye lasers in a stimulated Raman pump, coherent anti-Stokes Raman probe time-resolved experiment. Results are obtained for CS2 in carbon tetrachloride, benzene, nitrobenzene, and ethanol and for benzene nu2 in CS2. The dephasing rates of CS2 nu1 increase on dilution with the polar solvents and decrease or remain constant on dilution with the nonpolar solvents. The CS2/benzene solutions show a contrasting behavior, with the CS2 nu1 dephasing rate being nearly independent of concentration whereas the benzene nu2 dephasing rate decreases on dilution. These results are compared to theoretical models for vibrational dephasing of polyatomic molecules in solution.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
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    NASA TECHNICAL REPORTS
  • 2
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    The Galileo Attitude and Articulation Control System - A radiation-hard, high precision, state-of-the-art control system (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The Galileo Mission and Spacecraft design impose tight requirements on the Attitude and Articulation Control System (AACS). These requirements, coupled with the flexible spacecraft, the need for autonomy, and a severe radiation environment, pose a great challenge for the AACS designer. The resulting design and implementation are described, along with the discovery and solution of the Single-Event Upset problem. The status of the testing of the AACS in the Integration and Test Laboratory as well as at the spacecraft level is summarized.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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    NASA TECHNICAL REPORTS
  • 3
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    Changes in the earth's rate of rotation between A.D. 1672 and 1806 as deduced from solar eclipse timings (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Solar eclipse timings measured between A.D. 1672 and 1806 are analyzed to study the variation of Delta T (= ET - UT) over this interval. These solar eclipse observations confirm the results of Brouwer (1952), Martin (1969), and Stephenson and Morrison (1969) which were obtained from the analysis of occultations in this period. It is believed that Goldstein's (1985) analysis inadequately represents the changes in Delta T.
    Keywords: GEOPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 200; 1-2,
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    NASA TECHNICAL REPORTS
  • 4
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    The Galileo attitude and articulation control system - A radiation-hard, high precision, state-of-the-art control system (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The Galileo mission and spacecraft, consisting of a Jupiter-orbiter and an atmospheric entry probe, are discussed. Components will include: magnetometers and plasma-wave antennas on a boom, high-gain antenna, probe vehicle, two different bus electronics packages, and a radioisotope thermoelectric generator. Instruments, investigators and objectives are tabulated for both probe science and orbiter science investigations. Requirements in the design of the attitude and articulation control system are very stringent because of the complex dynamics, flexible body effects, the need for autonomy, and the severe radiation environment in the Jupiter nighborhood. Galileo was intended to be ready for launch via Space Shuttle in May of 1986.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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  • 5
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    Observed velocity fluctuations on a major Antarctic ice stream (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Recent ice velocity measurements on the major Antarctic Ice Stream B are compared with those collected 10 years ago. The results show that the ice flow in the mouth of Ice Stream B has decelerated by about 20 percent. The possible causes of this deceleration are discussed on the basis of present knowledge of current regional dynamics, and the possible effects of this deceleration on future ice stream behavior are examined.
    Keywords: GEOPHYSICS
    Type: Nature (ISSN 0028-0836); 334; 695-697
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  • 6
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    Analysis of forest structure using thematic mapper simulator data (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The potential of Thematic Mapper Simulator (TMS) data for sensing forest structure information has been explored by principal components and feature selection techniques. In a survey of forest structural properties conducted for 123 field sites of the Sequoia National Park, the canopy closure could be well estimated (r = 0.62 to 0.69) by a variety of channel bands and band ratios, without reference to the forest type. Estimation of the basal area was less successful (r = 0.51 or less) on the average, but could be improved for certain forest types when data were stratified by floristic composition. To achieve such a stratification, individual sites were ordinated by a detrended correspondence analysis based on the canopy of dominant species. The analysis of forest structure in the Sequoia data suggests that total basal area can be best predicted in stands of lower density, and in younger even-aged managed stands.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-24; 113-121
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  • 7
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    Mark 4A project training evaluation (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A participant evaluation of a Deep Space Network (DSN) is described. The Mark IVA project is an implementation to upgrade the tracking and data acquisition systems of the dSN. Approximately six hundred DSN operations and engineering maintenance personnel were surveyed. The survey obtained a convenience sample including trained people within the population in order to learn what training had taken place and to what effect. The survey questionnaire used modifications of standard rating scales to evaluate over one hundred items in four training dimensions. The scope of the evaluation included Mark IVA vendor training, a systems familiarization training seminar, engineering training classes, a on-the-job training. Measures of central tendency were made from participant rating responses. Chi square tests of statistical significance were performed on the data. The evaluation results indicated that the effects of different Mark INA training methods could be measured according to certain ratings of technical training effectiveness, and that the Mark IVA technical training has exhibited positive effects on the abilities of DSN personnel to operate and maintain new Mark IVA equipment systems.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommunications and Data Acquisition Report; p 134-164
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  • 8
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    Raster graphics display library (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Raster Graphics Display Library (RGDL) is a high level subroutine package that give the advanced raster graphics display capabilities needed. The RGDL uses FORTRAN source code routines to build subroutines modular enough to use as stand-alone routines in a black box type of environment. Six examples are presented which will teach the use of RGDL in the fastest, most complete way possible. Routines within the display library that are used to produce raster graphics are presented in alphabetical order, each on a separate page. Each user-callable routine is described by function and calling parameters. All common blocks that are used in the display library are listed and the use of each variable within each common block is discussed. A reference on the include files that are necessary to compile the display library is contained. Each include file and its purpose are listed. The link map for MOVIE.BYU version 6, a general purpose computer graphics display system that uses RGDL software, is also contained.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-181025 , NAS 1.26:181025 , ECGL-87-03
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  • 9
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    Data report for the Siple Coast (Antarctica) project (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report presents data collected during three field seasons of glaciological studies in the Antarctica and describes the methods employed. The region investigated covers the mouths of Ice Streams B and C (the Siple Coast) and Crary Ice Rise on the Ross Ice Shelf. Measurements included in the report are as follows: surface velocity and deformation from repeated satellite geoceiver positions; surface topography from optical levelling; radar sounding of ice thickness; accumulation rates; near-surface densities and temperature profiles; and mapping from aerial photography.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-100708 , NAS 1.15:100708 , REPT-88B-0214
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  • 10
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    Longitudinal stability and control characteristics of the Quiet Short-Haul Research Aircraft (QSRA) (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Flight experiments were conducted to evaluate various aerodynamic characteristics of the Quiet Short-Haul Research Aircraft (QSRA), an experimental aircraft that makes use of the upper-surface blown (USB) powered-lift concept. Time-history records from maneuvers performed with the aircraft in landing-approach and take-off configurations (with its stability augmentation system disengaged) were analyzed to obtain longitudinal stability and control derivatives and performance characteristics. The experiments included measuring the aircraft responses to variations in the deflection of direct-lift control spoilers and to thrust variations as well as to elevator inputs. The majority of the results are given for the aircraft in a landing configuration with the USB flaps at 50 degrees. For this configuration, if the static longitudinal stability is defined as the variation of the pitching-moment coefficient with the lift coefficient at a constant thrust coefficient, this stability decreases significantly with increasing angle of attack above 9 degrees. For this configuration, at small and negative angles of attack and high levels of thrust, the elevators and the horizontal stabilizer lost effectiveness owing to incipent stalling, but this occurred only during unsteady maneuvers and for brief time intervals.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TP-2965 , A-89133 , NAS 1.60:2965
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