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  • Other Sources  (1,129)
  • 1985-1989  (1,129)
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Keywords
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  • 1
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    SLR and VLBI technology trends (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: SLR and VLBI technology improvements are continuing, aimed at millimeter system performance. New SLR receiver components have achieved single shot RMS precision of 1 cm on LAGEOS. Recent VLBI phase delay observations have achieved sub-cm repeatability. New water vapor radiometers are achieving millimeter precisions in measurements of tropospheric path delay. These improvements, plus others to be discussed, will improve the accuracy of future polar motion measurements.
    Keywords: GEOPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Space station electrical power system (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The purpose of this paper is to describe the design of the Space Station Electrical Power System. This includes the Photovoltaic and Solar Dynamic Power Modules as well as the Power Management and Distribution System (PMAD). In addition, two programmatic options for developing the Electrical Power System will be presented. One approach is defined as the Enhanced Configuration and represents the results of the Phase B studies conducted by the NASA Lewis Research Center over the last two years. Another option, the Phased Program, represents a more measured approach to reaching about the same capability as the Enhanced Configuration.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-100140 , E-3692 , NAS 1.15:100140 , IAF-87-234
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Space Station Electrical Power System (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The purpose of this paper is to describe the design of the Space Station Electrical Power System. This includes the Photovoltaic and Solar Dynamic Power Modules as well as the Power Management and Distribution System (PMAD). In addition, two programmatic options for developing the Electrical Power System will be presented. One approach is defined as the Enhanced Configuration and represents the results of the Phase B studies conducted by the NASA Lewis Research Center over the last two years. Another option, the Phased Program, represents a more measured approach to reaching about the same capability as the Enhanced Configuration.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IAF PAPER 87-234
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Rapidly solidified titanium alloys by melt overflow (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A pilot plant scale furnace was designed and constructed for casting titanium alloy strips. The furnace combines plasma arc skull melting techniques with melt overflow rapid solidification technology. A mathematical model of the melting and casting process was developed. The furnace cast strip of a suitable length and width for use with honeycomb structures. Titanium alloys Ti-6Al-4V and Ti-14Al-21 Nb were successfully cast into strips. The strips were evaluated by optical metallography, microhardness measurements, chemical analysis, and cold rolling.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-4253 , NAS 1.26:4253
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Galileo probe parachute test program: Wake properties of the Galileo probe at Mach numbers from 0.25 to 0.95 (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of surveys of the near and far wake of the Galileo Probe are presented for Mach numbers from 0.25 tp 0.95. The trends in the data resulting from changes in Mach number, radial and axial distance, angle of attack, and a small change in model shape are shown in crossplots based on the data. A rationale for selecting an operating volume suitable for parachute inflation based on low Mach number flight results is outlined.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-RP-1130 , A-9643 , NAS 1.61:1130
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Disturbances along the Arizona monsoon boundary (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The possibility of the occurrence of disturbances along the 'Arizona monsoon boundary' (the boundary between two air masses in the southwestern U.S. and northwestern Mexico) during the summer is evaluated. Linear calculations demonstrate that the monsoon boundary is indeed unstable, with maximum growth rates of 0.4-0.6/d at a wavelength near 1200 km. It is found that the energy source for the most unstable waves is baroclinic and that the waves are barotropically damped.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Monthly Weather Review (ISSN 0027-0644); 117; 932-941
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    NASA TECHNICAL REPORTS
  • 7
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    Icing research tunnel test of a model helicopter rotor (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An experimental program has been conducted in the NASA Lewis Research Center Icing Research Tunnel (IRT) in which an OH-58 tail rotor assembly was operated in a horizontal plane to simulate the action of a typical main rotor. Ice was accreted on the blades in a variety of rotor and tunnel operating conditions and documentation of the resulting shapes was performed. Rotor torque and vibration are presented as functions of time for several representative test runs, and the effects of various parametric variations on the blade ice shapes are shown. This OH-58 test was the first of its kind in the United States and will encourage additional model rotor icing tunnel testing. Although not a scaled representative of any actual full-scale main rotor system, this rig has produced torque and vibration data which will be useful in assessing the quality of existing rotor icing analyses.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-101978 , E-4677 , NAS 1.15:101978 , Annual Forum and Technology Display; May 22, 1989 - May 24, 1989; Boston, MA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Chip Advancer For GPS Receiver (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Instrument errors made negligible. For each integration interval, both delay and rate of change of delay initialized to small fraction of chip - for example, to order of 10 to the negative 7th power - thereby making feedback control and extraction of delay highly accurate and flexible. With appropriate selection of sampling rate relative to chip rate, commensurability errors reduced to extremely small levels. In Global Positioning System (GPS) receiver, pseudorandom code sequence generated by simple digital logic incorporating effects of time, delay, and rate of change of delay. Flexibility in starting time and sum interval very useful in aligning correlation interval with beginnings and endings of data bits.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-16996 , NASA Tech Briefs (ISSN 0145-319X); 13; 6; P. 40
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Orbital and photometric properties of SZ Lyncis (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: New photometric results based on 3760 observations made on the Johnson BVRI system and 69 new radial-velocity measurements of the large-amplitude Delta Scuti binary SZ Lyncis are reported. Using these data and previous observations from the literature, improved values for the pulsation and orbital parameters are derived. The pulsation period is found to be 0.12052115 days, which is shorter than earlier determinations. The pulsation period is undergoing a secular period change of 3 X 10 to the -12th days/cycle. The orbital period of the binary is found to be 1181.1 days, with an orbital eccentricity of 0.188. A new ephemeris is given, which accurately predicts the times of light maximum and is consistent with the spectroscopic orbit. The mass function is 0.101 solar, which, together with other known properties of SZ Lyn, indicates that the unseen companion is most likely on the main sequence with a spectral type between F2 and K3.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 95; 1534-154
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Modeling fault diagnosis as the activation and use of a frame system (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Twenty pilots with instrument flight ratings were asked to perform a fault-diagnosis task for which they had relevant domain knowledge. The pilots were asked to think out loud as they requested and interpreted information. Performances were then modeled as the activation and use of a frame system. Cognitive biases, memory distortions and losses, and failures to correctly diagnose the problem were studied in the context of this frame system model.
    Keywords: BEHAVIORAL SCIENCES
    Type: Human Factors (ISSN 0018-7208); 28; 703-716
    Format: text
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    NASA TECHNICAL REPORTS
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