A model for the radiations from the compact strong sources
Astronomical model for origins and time variations of compact strong sources radiation over all bands
Cavaliere, A.↗
SEARCH · Search NASA
Results for “compact”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Compaction behavior of ceramic particles
Ceramic particle compaction as function of size, shape, loading rate and hardness for fused alumina, magnesia and mullite
Leiser, D. B.↗
Observations of seven compact sources in H II regions at wavelengths of 0.95, 1.65, and 2.73 centimeters
H II regions compact radiation sources flux densities observation at centimeter wavelengths
Hobbs, R. W.↗
I Zw 1 - A variable compact galaxy
Radio quiet compact galaxy I Zw 1 /0051 plus 12/ photometric data, noting variability and brightness levels
Barrett, J. W.↗
On the masses of compact galaxies
Mass distribution of compact galaxies, obtaining average mass/luminosity ratio
Chincarini, G.↗
Conceptual design of a compact fast reactor for space power
Compact fast reactor design for space power with rotating fuel drums, Mo alloy reflectors and honeycomb support structure
Davison, H. W.↗
Materials technology program for a compact fast reactor for space power
Materials technology of Ta-W-Hf clad uranium mononitride fuel for lithium cooled compact fast space power reactor, including irradiation tests
Gluyas, R. E.↗
Evidence for a highly compact X-ray source
Highly compact X ray source spectrum fitted by black body model at 15 million K
Bowyer, S.↗
A precision compact rotary vane attenuator
Precision compact rotary vane microwave attenuator, presenting modified law to extend dynamic attenuation range and reduce rotor section length
Otoshi, T. Y.↗
A compact spectroradiometer for solar simulator measurements
Compact spectral irradiance probe has been designed and built which uses wedge filter in conjunction with silicon cell and operational amplifier. Probe is used to monitor spectral energy distribution of solar simulators and other high intensity sources.
Seward, H. H.↗
Classification of radiating compact stars
A classification of compact stars, depending on the electron distribution in velocity space and the density profiles characterizing their magnetospheric plasma, is proposed. Fast pulsars, such as NP 0532, X-ray sources such as Sco-X1, and slow pulsars are suggested as possible evolutionary stages of similar objects. The heating mechanism of Sco-X1 is discussed in some detail.
Coppi, B.↗
High-capacity compact vortex valve for increasing stability of supersonic mixed-compression inlets
A special vortex valve was developed for increasing the stability margin of supersonic jet-engine inlets without the use of moving mechanical parts. A compact valve with high flow capacity and with high gain was obtained by using a unique outer wall in the vortex chamber instead of the usual cylindrical shape. The physical features of the valve are described, and the steady pressure-flow characteristics measured on scale models are given. Procedures are provided for adjusting the operating pressure, flow capacity, and gain through systematic changes in geometry.
Gebben, V. D.↗
Photometry of compact galaxies.
Photometric histories of the N galaxies 3C 390.3 and PKS 0521-36. Four other compact galaxies, Markarian 9, I Zw 92, 2 Zw 136, and III Zw 77 showed no evidence of variability. The photometric histories were obtained from an exhaustive study of those plates of the Harvard collection taken with large aperture cameras. The images of all galaxies reported were indistinguishable from stars due to the camera f-ratios and low surface brightness of the outlying nebulosities of the galaxies. Standard techniques for the study of variable stars are therefore applicable.
Shen, B. S. P.↗
Compact photomultiplier housing with controlled cooling.
Description of a compact photomultiplier housing which can provide controlled cooling to the photomultiplier tube down to -90 C. The cooling is accomplished by flowing liquid nitrogen cooled helium gas through a series of coils which envelop the photocathode portion of the tube. The temperature is controlled by controlling the flow of the gas with a fine adjustable needle valve. The temperature is measured near the photocathode of the photomultiplier by a calibrated thermistor.
SHARDANAND↗
A compact and low power coherent optical system for on-board spacecraft data processing.
Discussion of the design and performance of a compact low-power coherent optical data processing system suitable for spacecraft onboard applications. The system is a modification of the conventional optical data processing system in which a much more efficient solid state GaAs laser is substituted for the bulky and inferior He-Ne laser and paraboloidal mirror segments are substituted for the axially symmetric optical system of the conventional data processing system. Theoretical considerations are given to substantiate the improvement of performance aimed at in the modified system. Preliminary tests of the modified design being in progress indicate that a low power, rugged, small size optical system, capable of onboard spacecraft data processing, can be constructed by using off-axis paraboloidal mirror segments.-
Husain-Abidi, A. S.↗
Compact extragalactic nonthermal sources.
Results of photometry, polarimetry, spectroscopy, and direct photography at visual wavelengths of four additional objects of the BL Lacertae type are reported together with infrared observations to 10 microns for one of them (OJ 287). The data indicate that these objects are compact sources of nonthermal continuum radiation. They are likely to be extragalactic, and their possible relationship to QSOs is discussed.
Strittmatter, P. A.↗
A general method for the analysis of compact multifluid heat exchangers.
An analytical method of treating the complex heat-transfer processes involved in compact multifluid heat exchangers is described. The method is based on representing the heat transfer by means of the analogy between heat-transfer paths and electrical circuits. For plate-fin configurations, it includes the effects of heat exchange among nonadjacent fluids due to conduction through the fins of intervening passages. The application of the developed solution procedures to the design and analysis of multifluid heat exchangers is also discussed. Results obtained in using the electrical-analog method to examine the effects of conduction on performance are presented graphically in parametric form for a number of three-fluid plate-fin configurations. The discussion of the data presented includes a comparison with results given by alternative analytical procedures which neglect direct transfer between nonadjacent fluids.
Demetri, E. P.↗
Synchrotron sources. II - Pulsars and compact extragalactic objects.
Discussion of some limitations on synchrotron models for optical pulsars and compact extragalactic objects. Using the results of a previous paper, it is shown that several existing models for the pulsar NP 0532 are inconsistent with the measured time variations and polarization of the optical emission. The possibility that the low-frequency falloffs in some extragalactic objects (PKS 2134 + 004, OQ 208, and NGC 1068) could be due to emission from particles with small pitch angles, absorption by a thermal plasma, or synchrotron self-absorption is also considered. It is found that radiation by particles with small pitch angles could explain the radio emission from PKS 2134 + 004 and OQ 208, but this process is inconsistent with the observations of NGC 1068. The absorption interpretations cannot account for the turnover in the spectrum of PKS 2134 + 004.
Epstein, R. I.↗