ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Other Sources  (13)
  • 1990-1994  (13)
  • 1930-1934
Collection
Source
Keywords
Years
Year
  • 1
    facet.materialart.
    Unknown
    The effects of magnetic storm phases on F-layer irregularities (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The effects of magnetic storm phases on F-layer irregularities from auroral to equatorial latitudes in a nearly constant western longitude zone are presented by considering scintillation, spread F, and low-energy (less than 12 eV) electron precipitation data for eight magnetic storms that occurred during the high solar flux period September-November 1981. In the equatorial region, F-layer irregularities can be inhibited during the main phase. In the high latitude region, F-layer irregularities are found to be generated at the auroral latitudes during the main phase. During the recovery phase, when there are conditions of low magnetic activity, low auroral irregularities, and low-energy electron precipitation crossing the subauroral regions, strong F-layer irregularities are found to be generated in the subauroral regions.
    Keywords: GEOPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 12; 6, 19; 223-226
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    A 10,000-hr life test of an engineering model resistojet (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: One of the major issues associated with using resistojet thrusters on Space Station Freedom is the long life required. An engineering model resistojet was life-tested to determine if it was capable of meeting that requirement. This thruster, which was designed for 10,000 hr of operation at 2552.4 F (1400 C) or less under cyclical thermal conditions, successfully operated for 10,036 hr at 1836 F (1002 C) while undergoing 141 thermal cycles.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-103216 , E-5627 , NAS 1.15:103216
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Environmental process improvement feasibility study and demonstration program (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This report is the final product of an environmental study conducted by Western Commercial Space Center, Inc. under contract to Tennessee-Calspan Center for Space Transportation and Applied Research. The purpose of this investigation is to accurately document the current environmental and permitting processes associated with commercial space launch activity at Vandenberg AFB, and make recommendations to streamline those processes. The particular areas of interest focus on: identifying applicable Federal, state, and local laws, Department of Defense directives, and Air force regulations; defining the environmental process on Vandenberg AFB and how it relates with other agencies, including Federal and state regulatory agencies; and defining the air quality permit process. Study investigation results are applied to an example Pilot Space Launch Vehicle (PSLV) planning to launch from Vandenberg AFB. The PSLV space hardware is analyzed with respect to environmental and permitting issues associated with vehicle processing, facilities required (existing or new), and launch. The PSLV verified the earlier findings of the study and gave insight into streamlining recommendations.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-CR-196789 , NAS 1.26:196789
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Preconditioned implicit solvers for the Navier-Stokes equations on distributed-memory machines (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The GMRES method is parallelized, and combined with local preconditioning to construct an implicit parallel solver to obtain steady-state solutions for the Navier-Stokes equations of fluid flow on distributed-memory machines. The new implicit parallel solver is designed to preserve the convergence rate of the equivalent 'serial' solver. A static domain-decomposition is used to partition the computational domain amongst the available processing nodes of the parallel machine. The SPMD (Single-Program Multiple-Data) programming model is combined with message-passing tools to develop the parallel code on a 32-node Intel Hypercube and a 512-node Intel Delta machine. The implicit parallel solver is validated for internal and external flow problems, and is found to compare identically with flow solutions obtained on a Cray Y-MP/8. A peak computational speed of 2300 MFlops/sec has been achieved on 512 nodes of the Intel Delta machine,k for a problem size of 1024 K equations (256 K grid points).
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-TM-106449 , E-8302 , ICOMP-93-49 , NAS 1.15:106449 , AIAA PAPER 94-0408 , Aerospace Sciences Meeting and Exhibit; Jan 10, 1994 - Jan 13, 1994; Reno, NV; United States
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    Hubble Space Telescope imaging of the large-redshift gravitational lens candidate 1208 + 1011 (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Four-color photometry obtained with the HST is consistent with the hypothesis that the light from the quasar 1208 + 1011 (z = 3.8) is gravitationally lensed. Guided exposures taken with the HST Planetary Camera resolve the quasar image into two point-source components separated by 0.476 +/- 0.004 arcsec. The intensity ratio of the components is approximately 4:1 in each of four broadband HST filters with mean wavelengths of 4352, 5416, 6898, and 8922 A. The HST photometry, when combined with high-resolution ground-based spectroscopy, rules out the possibility that the secondary component is a Galactic star. The limit on additional point sources is 3 percent of the brighter image for separations greater than 0.5 arcsec from the primary component and 5 percent of the brighter component for separations between 0.1 and 0.5 arcsec. If the gravitational lens is an ordinary galaxy, it would not have been detected on the HST images.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 392; 1 Ju; L1-L4
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unknown
    Accurate positions and finding charts for 528 high-redshift, luminous quasars (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Finding charts and J2000 positions accurate to about 1 arcsec are presented for the 528 high-redshift (z is greater than 1), luminous (MV is less than -25.5) quasars investigated in the HST Snapshot Survey. A histogram showing the distribution of the differences between the positions determined by the Space Telescope Science Institute Astrometric Support Program and the catalog positions is provided.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 104; 678
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unknown
    A gravitational lens candidate discovered with the Hubble Space Telescope (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Evidence is reported for gravitational lensing of the high-redshift (z = 3.8) quasar 1208 + 101, observed as part of the Snapshot survey with the HST Planetary Camera. An HST V image taken on gyroscopes resolves the quasar into three point-source components, with the two fainter images having separations of 0.1 and 0.5 arcsec from the central bright component. A radio observation of the quasar with the VLA at 2 cm shows that, like most quasars of this redhsift, 1208 + 101 is radio quiet. Based on positional information alone, the probability that the observed optical components are chance superpositions of Galactic stars is small, but not negligible. Analysis of a combined ground-based spectrum of all three components, using the relative brightnesses of the HST image, supports the lensing hypothesis. If all the components are lensed images of the quasar, the observed configuration cannot be reproduced by simple lens models.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 386; L1-L3
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unknown
    Observations of an enhanced convection channel in the cusp ionosphere (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The development of an enhanced convection channel within the Southern Hemisphere cusp ionosphere is studied on the basis of the combined PACE radar and DMSP satellite data sets. All data (solar wind and ionosphere) suggest that the event is a signature of enhanced magnetic merging, i.e., the ionospheric signature of a flux transfer event. It is suggested that such a signature arises from several minutes of continuous, enhanced merging rather than short-lived pulses of enhanced merging. The channel propagated westward at about 3 km/s and, when fully formed, its zonal dimension was comparable with the average width of the cusp. It is shown that the formation of polar patches is associated with the occurrence of convection channels.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A3; p. 3767-3776.
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unknown
    Variable Sweep Transition Flight Experiment (VSTFE): Unified Stability System (USS). Description and Users' Manual (1990)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA initiated the Variable Sweep Transition Flight Experiment (VSTFE) to establish a boundary layer transition database for laminar flow wing design. For this experiment, full-span upper surface gloves were fitted to a variable sweep F-14 aircraft. The development of an improved laminar boundary layer stability analysis system called the Unified Stability System (USS) is documented and results of its use on the VSTFE flight data are shown. The USS consists of eight computer codes. The theoretical background of the system is described, as is the input, output, and usage hints. The USS is capable of analyzing boundary layer stability over a wide range of disturbance frequencies and orientations, making it possible to use different philosophies in calculating the growth of disturbances on sweptwings.
    Keywords: AERODYNAMICS
    Type: NASA-CR-181918 , NAS 1.26:181918 , D6-54961
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 10
    facet.materialart.
    Unknown
    Ribbon Cable Strap Partly Free Of Backlash (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Flexible ribbon cable strap carries heat and electrical signals across rotational shaft without creating backlash torques at both extremes of rotation through limited angular range. Keeps its flexibility and nonbacklash properties at cryogenic temperatures. Used to connect delicate equipment, such as movable infrared sensors, requiring precise positioning. Adapted to greater or lesser angular travel by changing its length and offset and bias of ribbon cables.
    Keywords: MECHANICS
    Type: GSC-13371 , NASA Tech Briefs (ISSN 0145-319X); 16; 1; P. 60
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...