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  • Other Sources  (433)
  • 1985-1989  (433)
  • 1989  (369)
  • 1985  (64)
  • 1
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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
  • 2
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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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
  • 4
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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
  • 5
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    Counterrotator And Correlator For GPS Receivers (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Accurate, all-digital, high-speed processor comprising correlator and down-converter developed for receivers in Global Positioning System (GPS). Processor reduces roundoff and commensurability errors to extremely small values. Use of digital chip and phase advancers provides outstanding control and accuracy in phase and feedback. Great flexibility imparted by provision for arbitrary starting time and integration length. Minimum-bit design requires minimum number of logical elements, thereby reducing size, power, and cost.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-16998 , NASA Tech Briefs (ISSN 0145-319X); 13; 6; P. 34
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Icing Research Tunnel test of a model helicopter rotor (1989)
    In:  Other Sources
    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: AIR TRANSPORTATION AND SAFETY
    Type: AHS Annual Forum; May 22, 1989 - May 24, 1989; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Processing of reflection-seismic data in the DEKORP processing center, Clausthal (1989)
    In:  In: Emmermann, R., Wohlenberg, J. (eds), The German Continental Deep Drilling Program (KTB) (site-selection studies in the Oberpfalz and Schwarzwald), Berlin : Springer, pp. 177-221
    Details
    Publication Date: 1989
    Keywords: seismic processing/methodology
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    CITATION DEKORP
  • 8
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    Aufgaben und Probleme bei der Bearbeitung seismischer Reflexionsdaten unter besonderer Berücksichtigung des Preprocessings und der Dekonvolution (1985)
    In:  Diplomarbeit, Institut für Geophysik der TU Clausthal
    Details
    Publication Date: 1985
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    CITATION DEKORP
  • 9
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    A real-time seismic amplitude measurement system (RSAM) (1989)
    U. S. Geological Survey
    In:  Open-File Report, Reston, VA, U. S. Geological Survey, vol. C 560, 183 pp., no. 89-0684, 26 pp., pp. 1143-1146 (SL3.8), (ISBN 3-933346-037)
    Details
    Publication Date: 1989
    Keywords: Seismology ; Real time earthquake monitoring ; Volcanology ; Magnitude
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    BIBLIOGRAPHY SEISMOLOGY
  • 10
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    Coherent Doppler lidar at 1.064 microns (1985)
    In:  CASI
    Details
    Publication Date: 2004-12-04
    Description: The rapid development of laser diodes offers the opportunity to design an all solid state transmitter for coherent Doppler lidar by using Nd:YAG as the gain medium. We have demonstrated that the components of such a system operate as expected. We believe that LD-pumped solid state laser oscillators and amplifiers offer an approach to space qualified transmitters with coherence, power, efficiency, and operating lifetime necessary to meet satellite platform requirements.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Goddard Space Flight Center, Proceedings of the NASA Symposium on Global Wind Measurements; p 181-182
    Format: text
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    NASA TECHNICAL REPORTS
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