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259
Jul 25, 2010
07/10
by
Hinton, David A.; Lohr, Gary W
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Studies have shown that radio communications between pilots and air traffic control contribute to high pilot workload and are subject to various errors. These errors result from congestion on the voice radio channel, and missed and misunderstood messages. The use of digital data link has been proposed as a means of reducing this workload and error rate. A critical factor, however, in determining the potential benefit of data link will be the interface between future data link systems and the...
Topics: IUE, NOVAE, SPACEBORNE ASTRONOMY, ULTRAVIOLET ASTRONOMY, BURSTS, ULTRAVIOLET SPECTRA
485
485
May 23, 2011
05/11
by
Kreider, Kevin L.; Baumeister, Kenneth J
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eye 485
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An explicit finite difference real time iteration scheme is developed to study harmonic sound propagation in aircraft engine nacelles. To reduce storage requirements for future large 3D problems, the time dependent potential form of the acoustic wave equation is used. To insure that the finite difference scheme is both explicit and stable for a harmonic monochromatic sound field, a parabolic (in time) approximation is introduced to reduce the order of the governing equation. The analysis begins...
Topics: QUASARS, HUBBLE SPACE TELESCOPE, SPACEBORNE ASTRONOMY, GALAXIES, SENSITIVITY, LUMINOSITY,...
192
192
Jul 11, 2010
07/10
by
Gordy, D. J
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eye 192
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Negative-limited sealed nickel-cadmium cells are a possible means toward increasing the life of nickel-cadmium cells to about a decade or more. The purpose of this program is to design, construct, and test 100, 20 Ah and 100, 30 Ah negative-limited sealed cells. The cell design was completed and hardware was ordered during the first quarter. Electrode fabrication was started in the first quarter and carried on through the second quarter. The fabrication and selection of the necessary electrodes...
Topics: GAMMA RAYS, SATELLITE OBSERVATION, SPACEBORNE ASTRONOMY, QUANTUM COUNTERS, RADIATION SOURCES, VELA...
The purpose of strategic planning roadmap is to:Fulfill the strategic planning requirements; Provide a guide to the science community in presenting research requests to NASA; Inform and inspire; Focus investments in technology and research for future missions; and Provide the scientific and technical justification for augmentation requests.
Topics: NASA Technical Reports Server (NTRS), MANAGEMENT PLANNING, SPACEBORNE ASTRONOMY, DECISION MAKING,...
233
233
May 27, 2011
05/11
by
Balakrishnan. A. V
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This paper presents a brief report on superstable semigroups - abstract theory and some applications thereof. The notion of super stability is a strengthening of exponential stability and occurs in Timoshenko models of structures with self-straining material using pure (idealized) rate feed- back. It is also relevant to the problem of Riesz bases of eigenfunctions of infinitesimal generators under perturbation.
Topics: X RAY ASTROPHYSICS FACILITY, ECLIPSES, SPACEBORNE ASTRONOMY, X RAY ASTRONOMY, OPERATIONAL PROBLEMS,...
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370
Jul 23, 2010
07/10
by
Dorr, Dan W
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eye 370
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Work being accomplished to develop a real-time, piloted simulation of a helicopter using the vertical motion simulator at NASA Ames is discussed. The trajectory generation algorithm and the flight path controller are described, and the software integration of the entire terrain following/terrain avoidance (TF/TA) system is discussed. Real-time simulation requirements and the unique features of applying TF/TA system to helicopter flight are summarized. Initial results indicate that the system is...
Topics: ANNUAL VARIATIONS, DUST STORMS, MARS (PLANET), POLAR REGIONS, CAP CLOUDS, SOUTHERN HEMISPHERE,...
245
245
May 23, 2011
05/11
by
Ries, Gregory Lawrenc
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eye 245
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This thesis presents a method for conducting hierarchical simulations to assess system hardware and software dependability. The method is intended to model embedded microprocessor systems. A key contribution of the thesis is the idea of using fault dictionaries to propagate fault effects upward from the level of abstraction where a fault model is assumed to the system level where the ultimate impact of the fault is observed. A second important contribution is the analysis of the software...
Topics: IUE, EXTREME ULTRAVIOLET EXPLORER SATELLITE, ASTRONOMICAL SATELLITES, RADIO ASTRONOMY, SPACEBORNE...
This volume contains the Final Report for the International Ultraviolet Explorer (IUE) Observatory Operations contract, NAS5-28787. The report summarizes the activities of the IUE Observatory over the 13-month period from November 1985 through November 1986 and is arranged in sections according to the functions specified in the Statement of Work (SOW) of the contract. In order to preserve numerical correspondence between the technical SOW elements specified by the contract and the sections of...
Topics: NASA Technical Reports Server (NTRS), IUE, REPORTS, SPACEBORNE ASTRONOMY, ULTRAVIOLET TELESCOPES,...
376
376
Jul 11, 2010
07/10
by
Shatalov, A. Y.; Kravchenko, T. A.; Aleksandrova, Z. F
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A thermodynamic calculation is made of the degree of equilibrium oxidation reduction conversion of quinone-hydroquinone and metal containing redoxites; its experimental verification with respect to the redox potential was carried out. The effect of various factors on the completeness of the utilization of the theoretical potential is noted.
Topics: MARS ATMOSPHERE, MOISTURE CONTENT, WATER VAPOR, ANNUAL VARIATIONS, ASTRONOMICAL SPECTROSCOPY, MARS...
354
354
Jul 11, 2010
07/10
by
GALTIERI, A
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GAS CHROMATOGRAPHY TECHNIQUES ARE PRESENTED ALONG WITH SPECIAL EMPHASIS ON ANALYTICAL PROBLEMS ENCOUNTERED IN PETROLEUM TECHNOLOGY. PACKED AND CAPILLARY COLUMNS ARE DISCUSSED, INCLUDING THEIR RESOLUTION AND EFFICIENCY; THEIR CHARACTERISTICS ARE COMPARED. APPLICATIONS OF GAS CHROMATOGRAPHY TO THE ANALYSIS OF MIXTURES OF GASES, HYDROCARBONS (ALIPHATIC AND AROMATIC), ASPHALTS, AND LEAD ANTIKNOCK COMPOUNDS ARE REVIEWED. THE SUITABILITY OF DIFFERENT TYPES OF COLUMNS, SUPPORTS, AND COATINGS FOR...
Topics: APOLLO TELESCOPE MOUNT, SKYLAB PROGRAM, SOLAR PHYSICS, SOLAR SPECTRA, DATA ACQUISITION, SOLAR...
The Quick Reaction and Special Purpose Facility Definition Team for Solar Physics Spacelab Payloads examined a variety of instruments to fulfill the following functions: (1) solar physics research appropriate to Spacelab, (2) correlative data for research in such fields as aeronomy, magnetospheric physics, ionospheric physics, meteorology and climatology, (3) target selection for activity alert monitoring and (4) pointing accuracy monitoring of Spacelab platforms. In this examination the team...
Topics: NASA Technical Reports Server (NTRS), ONBOARD EQUIPMENT, SOLAR PHYSICS, SPACEBORNE ASTRONOMY,...
198
198
May 22, 2011
05/11
by
Bartlett, Randal
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eye 198
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This report is a summary of the design sequence, procedures, and results of the student projects_of the 1994 spring quarter. The report reviews the design process used, selection of the design teams, critical presentation dates, and the design solutions. Five design teams, consisting of two students per team, designed and presented five full-size glovebox mockups to NASA.
Topics: GRAPHICAL USER INTERFACE, HUBBLE SPACE TELESCOPE, INFORMATION SYSTEMS, USER MANUALS (COMPUTER...
426
426
May 23, 2011
05/11
by
Mack, Larry Howard, Jr
texts
eye 426
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Spectral radiation measurements were made in the range of 200 to 900 nm across a section of the plenum of an arc jet wind tunnel using a series of optical fibers. The spectra contained line radiation from Oxygen and Nitrogen atoms and molecular radiation from N2(), N2, and NO. Abel inversion technique is used to obtain radial distribution of the spectra. The analysis yielded radial profiles of the electronic excitation, vibrational and rotational temperatures of the flow field. Spectral fitting...
Topics: O STARS, B STARS, STELLAR ROTATION, ULTRAVIOLET SPECTRA, SPACEBORNE ASTRONOMY, IUE, ULTRAVIOLET...
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199
Sep 20, 2010
09/10
by
Marzullo, Keith; Szafranska, Ida M
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eye 199
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Over the last four years, the Meta toolkit was developed for controlling distributed applications. This toolkit has been publicly available as part of the academic ISIS release, and has been used for building various system monitoring and control applications. One major stumbling block with using Meta has been the language (called NPL) it supports. NPL is very low-level and using it is difficult, in the same way it is difficult to write machine language programs or raw Postscript programs....
Topics: CENSUS, DATA BASES, DATA MANAGEMENT, SPACE PROGRAMS, SURVEYS, REMOTE SENSING, SATELLITE...
A collection is presented of summaries designed to provide information about scientific research projects conducted in the Planetary Astronomy Program in 1990 and 1991, and to facilitate communication and coordination among concerned scientists and interested persons in universities, government, and industry. Highlights of recent accomplishments in planetary astronomy are included.
Topics: NASA Technical Reports Server (NTRS), ASTEROIDS, COMETS, PLANETARY ATMOSPHERES, SATELLITE...
232
232
May 27, 2011
05/11
by
Stephen, Mark A.; Dallas, Joseph L.; Afzal, Robert S
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eye 232
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NASA's Goddard Space Flight Center is developing the Geoscience Laser Altimeter System (GLAS) employing a diode pumped, Q-Switched, ND:YAG laser operating at 40 Hz repetition rate. To meet the five-year mission lifetime goal, a single transmitter would accumulate over 6.3 billion shots. Cr(4):YAG is a promising candidate material for passively Q-switching the laser. Historically, the performance of saturable absorbers has degraded over long-duration usage. To measure the multi-billion shot...
Topics: ARTIFICIAL SATELLITES, ASTRONOMICAL OBSERVATORIES, SATELLITE OBSERVATION, CONFERENCES, SPACEBORNE...
506
506
May 31, 2011
05/11
by
Lee, Kang N.; Fox, Dennis S.; Eldridge, Jeffrey I.; Bansal, Narottam P.; Miller, Robert A.; Zhu, Dongming; Robinson, Raymond C
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Current state-of-the-art environmental barrier coatings (EBCs) for Si-based ceramics consist of three layers: a silicon bond coat, an intermediate mullite (3Al2O3-2SiO2) or mullite BSAS (1-xBaO-xSrO-Al2O3-2SiO2) layer, and a BSAS top coat. Areas of concern for long-term durability are environmental durability, chemical compatibility, silica volatility, phase stability, and thermal conductivity. Variants of this family of EBCs were applied to monolithic SiC and melt infiltrated SiC/SiC...
Topics: IMAGING TECHNIQUES, OPTICAL RADAR, THREE DIMENSIONAL MODELS, SPACEBORNE ASTRONOMY, ALTIMETRY,...
An overview is presented on current and planned research activities in the major areas of solar physics, planetary atmospheres, and space astronomy. The approach to these unsolved problems involves experimental techniques, theoretical analysis, and the use of computers to analyze the data from space experiments. The point is made that the research program is characterized by each activity interacting with the other activities in the laboratory.
Topics: NASA Technical Reports Server (NTRS), PLANETARY ATMOSPHERES, SOLAR PHYSICS, SPACEBORNE ASTRONOMY,...
The final report and semiannual reports 1, 2, and 3 in response to the study of 'Planetary System Detection by POINTS' is presented. The grant covered the period from 15 Jun. 1988 through 31 Dec. 1989. The work during that period comprised the further development and refinement of the POINTS concept. The status of the POINTS development at the end of the Grant period was described by Reasenberg in a paper given at the JPL Workshop on Space Interferometry, 12-13 Mar. 1990, and distributed as CfA...
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL INTERFEROMETRY, PLANETARY SYSTEMS, SPACEBORNE...
Selected information from the current Hubble Space Telescope (HST) science programs for the Guaranteed Time Observers (GTO's) and General Observers (GO's) is presented. Included are program abstracts, detailed listings of specific targets, and exposure information.
Topics: NASA Technical Reports Server (NTRS), HUBBLE SPACE TELESCOPE, MISSION PLANNING, SPACEBORNE...
611
611
Jul 12, 2010
07/10
by
Echols, F. L.; Broome, P. A
texts
eye 611
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An input to a study conducted to define a set of carrier avionics for supporting large structures experiments attached to the Space Shuttle Orbiter is reported. The ''baseline'' Orbier interface used in developing the avionics concept for the Space Technology Experiments Platform, STEP, which Langley Research Center has proposed for supporting experiments of this sort is defined. Primarily, flight operations capabilities and considerations and the avionics systems capabilities that are...
Topics: ASTROPHYSICS, GRAVITATIONAL WAVES, MISSION PLANNING, SPACEBORNE ASTRONOMY, DOPPLER EFFECT, HYDROGEN...
Submission Overview: Our primary objective is to convey a sense of the significant advances possible in astrophysics investigations for major Cosmic Origins COR program goals with a 2.4m telescope asset outfitted with one or more advanced UV visible instruments. Several compelling science objectives were identified based on community meetings these science objectives drove the conceptual design of instruments studied by the COR Program Office during July September 2012. This RFI submission...
Topics: NASA Technical Reports Server (NTRS), ULTRAVIOLET TELESCOPES, HUBBLE SPACE TELESCOPE, DISPOSAL,...
A study was conducted to determine if a group of existing astronomy experiments, with stated scientific objectives could be accommodated by the sortie mission. Additional goals of the study included defining the operational concept, the support hardware, mission profiles, and the kind of interfaces that would be required with the space shuttle and sortie lab. The results of the study are presented and indicate that the astronomy sortie mission concept: (1) is technically feasible using...
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, SPACEBORNE ASTRONOMY, SPACELAB, EXPERIMENT...
This final technical report presents a summary of significant accomplishments made with Ultraviolet Imaging Telescope Research Activities.
Topics: NASA Technical Reports Server (NTRS), IMAGING TECHNIQUES, ULTRAVIOLET TELESCOPES, SPACEBORNE...
No abstract available
Topics: NASA Technical Reports Server (NTRS), GUIDANCE SENSORS, JAMES WEBB SPACE TELESCOPE, ASSEMBLING,...
The science of astronomy depends on modern-day temples called telescopes. Astronomers make pilgrimages to remote mountaintops where these large, intricate, precise machines gather light that rains down from the Universe. Bit, since Earth is a bright, turbulent planet, our finest telescopes are those that have been launched into the dark stillness of space. These space telescopes, named after heroes of astronomy (Hubble, Chandra, Spitzer, Herschel), are some of the best ideas our species has...
Topics: NASA Technical Reports Server (NTRS), SPACEBORNE TELESCOPES, ASTRONOMICAL OBSERVATORIES, SPACEBORNE...
287
287
Jul 11, 2010
07/10
by
GRIGORYEV, A. A.; LIPATOV, V. B
texts
eye 287
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THE MAIN REGIONS OF DUST STORMS IN THE ARID AND SUB-ARID ZONES AND THE TRANSFER PATHS OF THE DUST MATERIALS WERE STUDIED. RELATIONSHIPS BETWEEN THE DUST STORMS AND SYNOPTIC CHARACTER AND COMPOSITION OF THE UNDERLYING SURFACES ARE ANALYZED. THE FEASIBILITY OF STUDYING THE DYNAMICS OF THESE PHENOMENA USING SPACE IMAGERY IS SHOWN. THE POSSIBILITY OF USING MICROPHOTOMETRY FROM TV PICTURES IS CONSIDERED FOR ESTIMATING THE STRUCTURE OF DUST STORMS.
Topics: POINTING CONTROL SYSTEMS, SPACE MISSIONS, SPACECRAFT INSTRUMENTS, SPACELAB, STABILIZED PLATFORMS,...
469
469
May 23, 2011
05/11
by
Bailey, David H
texts
eye 469
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The author has written a package of Fortran routines that perform a variety of axithmetic operations and transcendental functions on floating point numbers of arbitrarily high precision, including large integers. This package features: (1) virtually universal portability; (2) high performance; especially on vector supercomputers; (3) advanced algorithms; including FFT-based multiplication and quadratically convergent algorithms for pi, exp and log; and (4) extensive self-checking and debug...
Topics: SPATIAL DISTRIBUTION, GAMMA RAY BURSTS, SPACEBORNE ASTRONOMY, GAMMA RAY OBSERVATORY, CONFIDENCE...
406
406
Jul 25, 2010
07/10
by
Pototzky, Anthony S.; Spain, Charles V.; Soistmann, David L.; Noll, Thomas E
texts
eye 406
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A presentation provided at the Fourth National Aerospace Plane Technology Symposium held in Monterey, California, in February 1988 is discussed. The objective is to provide current results of ongoing investigations to develop a methodology for predicting the aerothermoelastic characteristics of NASP-type (hypersonic) flight vehicles. Several existing subsonic and supersonic unsteady aerodynamic codes applicable to the hypersonic class of flight vehicles that are generally available to the...
Topics: ECLIPSING BINARY STARS, IUE, SPACEBORNE ASTRONOMY, ULTRAVIOLET ASTRONOMY, ULTRAVIOLET SPECTRA,...
The work performed to arrive at a baseline astronomy sortie mission concept is summarized. The material includes: (1) definition of the telescopes and arrays; (2) preliminary definition of mission and systems; (3) identification, definition, and evaluation of alternative sortie programs; (4) the recommended astronomy sortie program; and (5) the astronomy sortie program concept that was approved as a baseline for the remainder of the project.
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, SPACE SHUTTLES, SPACEBORNE ASTRONOMY,...
This document invites and supports participation by the international astronomical community in the HST General Observer and Archival Research programs. These documents contain the basic procedural and technical information required for HST proposal preparation and submission, including applicable deadlines. The telescope and its instruments were built under the auspices of the NASA and the European Space Agency.
Topics: NASA Technical Reports Server (NTRS), HUBBLE SPACE TELESCOPE, SPACEBORNE ASTRONOMY, REAL TIME...
The objective of this program was to develop the technology and construct a number of tubes conforming to the chosen configuration. A total of ten starts were made and ten tubes went through to test. Of the ten tubes three were CsI on LiF, six were CsTe on MgF2 and one was KNaCsSb on SiO2. All three faceplate crystals sealed successfully using indium as the sealant. In addition, a number of test seals were made and two photocathode sample runs were made. The tasks E-field, faceplate,...
Topics: NASA Technical Reports Server (NTRS), OPTICAL EQUIPMENT, PHOTOCATHODES, PHOTOMASKS, SPACEBORNE...
378
378
May 22, 2011
05/11
by
Verdon, Joseph M.; Barnett, M.; Ayer, T. C
texts
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Applications for unsteady aerodynamics analysis in this report are: (1) aeroelastic: blade flutter and forced vibration; (2) aeroacoustic: noise generation; (3) vibration and noise control; and (4) effects of unsteadiness on performance. This requires that the numerical simulations and analytical modeling be accurate and efficient and contain realistic operating conditions and arbitrary modes of unsteady excitation. The assumptions of this application contend that: (1) turbulence and transition...
Topics: COMPUTER PROGRAMMING, SYSTEMS ANALYSIS, VIABILITY, MISSION PLANNING, SCHEDULING, SOFTWARE...
The projected design of an optical instrument package for the large space telescope includes: a diffraction limited camera; low- and high-dispersion spectrographs; astrometric machines; photometers; polarimeters; F/12 camera; Fourier interferometer; infrared instrumentation; and a very high dispersion spectrographs.
Topics: NASA Technical Reports Server (NTRS), HUBBLE SPACE TELESCOPE, OPTICAL MEASURING INSTRUMENTS,...
The archived exposures catalog for the Hubble Space Telescope is presented. Information is in table format.
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL CATALOGS, HUBBLE SPACE TELESCOPE, SKY SURVEYS...
The Space Interferometry Mission (SIM) is capable of detecting and measuring the mass of terrestrial planets around stars other than our own. It can measure the mass of black holes and the visual orbits of radio and x-ray binary sources. SIM makes possible a new level of understanding of complex astrophysical processes. SIM achieves its high precision in the so-called narrow-angle regime. This is defined by a 1 degree diameter field in which the position of a target star is measured with...
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL INTERFEROMETRY, SPACEBORNE ASTRONOMY,...
This slide presentation reviews the typical pulsar analysis, giving tips for screening of the data, the use of time series analysis, and utility tools. Specific information about analyzing Vela data is reviewed.
Topics: NASA Technical Reports Server (NTRS), PULSARS, TIME SERIES ANALYSIS, SPACEBORNE ASTRONOMY, FERMI...
487
487
May 6, 2010
05/10
by
Ryan, S.; Ordonez, E.; Christiansen, E. L.; Lear, D. M
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Open cell metallic foam core sandwich panel structures are of interest for application in spacecraft micrometeoroid and orbital debris shields due to their novel form and advantageous structural and thermal performance. Repeated shocking as a result of secondary impacts upon individual foam ligaments during the penetration process acts to raise the thermal state of impacting projectiles ; resulting in fragmentation, melting, and vaporization at lower velocities than with traditional shielding...
Topics: GAMMA RAYS, FERMI GAMMA-RAY SPACE TELESCOPE, GAMMA RAY ASTRONOMY, GAMMA RAY SOURCES (ASTRONOMY),...
Ultraviolet spectra with the International Ultraviolet Explorer of three Type II Cepheid variable stars which exhibit carbon stars characteristics are obtained.
Topics: NASA Technical Reports Server (NTRS), ULTRAVIOLET SPECTRA, CEPHEID VARIABLES, SPACEBORNE ASTRONOMY,...
436
436
May 23, 2011
05/11
by
Desai, Prasun N.; Braun, Robert D.; Powell, Richard W.; Engelund, Walter C.; Tartabini, Paul V
texts
eye 436
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The present study performs a six degree-of-freedom entry dispersion analysis for the Multiple Experiment Transporter to Earth Orbit and Return (METEOR) mission. METEOR offered the capability of flying a recoverable science package in a microgravity environment. However, since the Recovery Module has no active control system, an accurate determination of the splashdown position is difficult because no opportunity exists to remove any errors. Hence, uncertainties in the initial conditions prior...
Topics: DEUTERIUM, HUBBLE SPACE TELESCOPE, INTERSTELLAR GAS, HYDROGEN, ABUNDANCE, LYMAN SPECTRA, LINE...
No abstract available
Topics: NASA Technical Reports Server (NTRS), GRAVITATIONAL WAVES, LISA (OBSERVATORY), SPACEBORNE...
A study to define the astronomy sortie missions was conducted. The design analyses and tradeoff studies conducted for candidate concepts are presented. The subjects discussed are: (1) system and subsystem requirements, (2) space shuttle interfaces, (3) infrared telescope development, and (4) experiments to be conducted during the mission.
Topics: NASA Technical Reports Server (NTRS), MISSION PLANNING, SPACE MISSIONS, SPACE SHUTTLES, SPACEBORNE...
During the reporting period, we carried out investigations required to enhance our design of POINTS as a tool for the search for and characterization of extra-solar planetary systems. The results of that work were included in a paper on POINTS as well as one on Newcomb, which will soon appear in the proceedings of SPIE Conference 2200. (Newcomb is a spinoff of POINTS. It is a small astrometric interferometer now being developed jointly by SAO and the U.S. Navy. It could help establish some of...
Topics: NASA Technical Reports Server (NTRS), ASTROMETRY, ASTRONOMICAL INTERFEROMETRY, INTERFEROMETERS,...
Representative astronomy objectives, experiments, facilities, and instruments for use in the space station are discussed. The specific program elements describe a coordinated multiwavelength, multisensor approach needed to locate, observe, and interpret radiation from extragalactic, galactic, solar, and planetary sources in the different parts of the spectrum with spectral, angular, and temporal resolution not achievable from earth sites. Items of astronomy equipment are identified for the...
Topics: NASA Technical Reports Server (NTRS), EXPERIMENT DESIGN, SPACE STATIONS, SPACEBORNE ASTRONOMY,...
The Phase A study of the Large Space Telescope (LST) is reported. The study defines an LST concept based on the broad mission guidelines provided by the Office of Space Science (OSS), the scientific requirements developed by OSS with the scientific community, and an understanding of long range NASA planning current at the time the study was performed. The LST is an unmanned astronomical observatory facility, consisting of an optical telescope assembly (OTA), scientific instrument package (SIP),...
Topics: NASA Technical Reports Server (NTRS), HUBBLE SPACE TELESCOPE, SCIENTIFIC SATELLITES, SPACEBORNE...
An improved vidicon image sensor for space astronomy applications is developed that features reliably sealed ultraviolet transmitting windows and achieves acceptable photocathode quantum efficiency on these MgF2 windows. New preamplifier designs improve the dynamic range by reduction of the readout noise.
Topics: NASA Technical Reports Server (NTRS), SPACEBORNE ASTRONOMY, TELEVISION TRANSMISSION, VIDICONS,...
221
221
Jul 12, 2010
07/10
by
Fusaro, R. L
texts
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Rubbed films of natural flake Madagascar graphite were applied to ASTM A-355(D) steel with chemical surface pretreatments of zinc phosphate, gas nitride, salt nitride, sulfo-nitride, and with mechanical pretreatment (sandblasting). SAE 1045 steel pins were slid against these films using a pin-on-disk tribometer. The results indicate that two different lubricating mechanisms can occur. In the chemical surface pretreatment, the graphite can mix together to form a surface layer of the two...
Topics: ASTROPHYSICS, SATELLITE-BORNE INSTRUMENTS, UNIVERSE, HEAO, NASA PROGRAMS, SPACEBORNE ASTRONOMY,...
Spatially resolved IUE spectra (1150 to 2000 A) taken at the position of SN 1987A in March 1987 show that the 12th mag B3 I star Sk -69 deg 202 disappeared. Only the fainter companion stars (Star 2 and Star 3) are present near the site of the supernova. It is concluded that Sk -69 deg 202 exploded to produce SN 1987A. The known characteristics of Sk -69 deg 202 are consistent with the interpretation that the progenitor was a relatively compact star, having a high-velocity low-density stellar...
Topics: NASA Technical Reports Server (NTRS), IUE, SPACEBORNE ASTRONOMY, STELLAR EVOLUTION, SUPERNOVA...
Recently there have been two important findings concerning the Crab both of which are highlighted in this workshop. One finding was the discovery, using the AGILE and Fermi satellites, of gamma-ray flares from the direction of the Crab Nebula. The other finding was the variability, up to 7%, with time scales of the order of a year of the integrated hard X-ray emission. We have been using the Chandra X-Ray observatory to monitor the Crab on a monthly cadence since just after the 2010 September...
Topics: NASA Technical Reports Server (NTRS), CRAB NEBULA, STELLAR ACTIVITY, X RAY ASTRONOMY, X RAY...
No abstract available
Topics: NASA Technical Reports Server (NTRS), JAMES WEBB SPACE TELESCOPE, INFRARED TELESCOPES, SPACEBORNE...
