The effect of repeated acceleration on the histological structure of the liver
Repeated acceleration effects on histological structure of dog liver
Kotovskiy, Ye. F.↗
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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.
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A passive isolating transformer of repeated positive or negative voltage pulses.
Passive circuit to transform voltage of indefinitely repeated positive or negative pulses using transistors, diodes and magnetic cores
Niedra, J. M.↗
A high-gain self-steering microwave repeater.
High gain self steering microwave repeater for earth-satellite communications noting design, performance and results of color TV transmissions
Birgenheier, R. A.↗
Effects from repeated short-term inhalation of fluorine.
Effects on lungs, livers, and kidneys of mice, rats, and rabbits from repeated short-term inhalation of fluorine
FLUORINE↗
Repeatability, accuracy, portability, and errors of the portable alignment gyrocompass system
Portable alignment gyrocompass system accuracy, repeatability, portability, and errors
Mihm, J. J.↗
Linear repeater design for the GSFC Mark 1 tracking and data relay satellite
Linear repeater design for tracking and data relay satellite system
Heffernan, P. J.↗
Self-repeating plasma generator having communicating annular and linear arc discharge passages Patent
Direct current powered self repeating plasma accelerator with interconnected annular and linear discharge channels
Sabol, A. P.↗
Creep deformation behavior of metals under repeated stress reversals Final report
Reversed creep tests on chemical lead, aluminum, and copper and creep deformation behavior under repeated stress reversals
Kitagawa, M.↗
The effect of repeated Compton scatterings on the diffuse X-ray background
Recent Monte Carlo computations, based on a speculative extrapolation of the electron spectrum, suggested that repeated scatterings contribute most of the extragalactic X-ray background around 3 MeV in a Compton model. We have redone this calculation analytically with a similar electron spectrum, but with very different results. The double-scatter contribution near 3 MeV does not exceed 1 percent and cannot improve the fit to data. The effect is largest near 1 keV but will probably not be observable.
Felten, J. E.↗
An automated and repeatable data analysis procedure for remote sensing applications
A new multispectral data analysis procedure, based on LARSYS, has been developed which substantially reduces the influence of the analyst. The analysis is automated, including the interpretation of clustering results. The classification results obtained are repeatable and not biased by analyst subjectivity during the analysis.
Davis, B. J.↗
Repeated sharp flux dropouts observed at 6.6 earth radii during a geomagnetic storm
A number of repeated rapid flux dropouts have been observed at 6.6 earth radii by the low-energy proton detectors on board the ATS 6 satellite during the July 4-6, 1974, geomagnetic storm period. These rapid flux changes are caused by the fact that the outer boundary of the trapped radiation region moves back and forth past the satellite. Although a tilting field line configuration can cause the boundary to pass the satellite, as has frequently been reported in the literature, the boundary is shown to be distorted by a large surface wave traveling eastward around the earth. The maximum velocity of the wave was observed to be about 40 km/s.
Su, S.-Y.↗
Repeated-cascade theory of strong turbulence in a magnetized plasma
A two-dimensional Navier-Stokes equation of vorticity in fluid turbulence is used to model drift turbulence in a plasma with a strong constant magnetic field and a constant mean density gradient. The nonlinear eddy diffusivity is described by a time-integrated Lagrangian correlation of velocities, and the repeated-cascade method is employed to choose the rank accounting for nearest-neighbor interactions, to calculate the Lagrangian correlation, and to close the correlation hierarchy. As a result, the diffusivity becomes dependent on the plasma's induced diffusion and is represented by a memory chain that is cut off by similarity and inertial randomization. Spectral laws relating the kinetic-energy spectrum to the -5, -5/2, -3, and -11 powers of wavenumber are derived for the velocity subranges of production, approach to inertia, inertia, and dissipation, respectively. It is found that the diffusivity is proportional to some inverse power of the magnetic field, that power being 1, 2/3, 5/6, and 2, respectively, for the four velocity subranges.
Tchen, C. M.↗
Rocketsonde repeatability of temperature and wind measurements as obtained from rocketsonde network systems
Variability of temperature and wind data obtained close in time is of particular concern since questions exist on whether this variability is due to natural atmospheric variability or arises from instrumental causes. Previously conducted repeatability tests of the U.S. Loki Datasonde instrument indicated rms differences of 1C in temperature and 3 mps in wind. The newer Super Loki Datasonde instrument reaches apogee 20 km higher (about 82 km) than the older system and attains a higher initial fall velocity, thus the heat exchange effects on the measuring components are different. Data were obtained from routine rocketsonde launchings, available in pairs, with time differences of 12 to 120 minutes. Mean values calculated over the altitude range of 30 to 70 km indicate than an rms difference of 1-2 C in temperature and of 3-4 mps in the zonal and meridional components exist. Additional computations in 5-km altitude layers suggest that rms differences do not exceed 3 C and 7 mps at the highest altitudes.
Schmidlin, F. J.↗
Noise calibration repeatability of an airborne third-generation radiometer
A third-generation S-band radiometer has been calibrated at intervals over 3.5 years. The built-in stabilization concepts have proven to be very effective. In spite of some nonideal conditions (on runway, in wind, and in rain), an rms value of 0.7-K calibration repeatability has been observed with an average temperature deviation (bias error) of 0.03 K.
Blume, H.-J. C.↗
Geodesy by radio interferometry - Determination of a 1.24-km base line vector with approximately 5-mm repeatability
The paper describes a new method for determining the base line vector from X band radio interferometric observations of extragalactic sources. The procedure utilizes the precision inherent in fringe phase measurements. Eleven separate experiments were conducted to measure the 1.24-km base line vector between the two antennas of the Haystack Observatory in Westford, Mass. The repeatability, scatter, and level of accuracy are discussed.
Rogers, A. E. E.↗
Repeated observation of an uncertain signal
The focus here is on sensory adaptation, or progressively more appropriate attention, as repeated observations yield more information about a signal with an uncertain parameter. The signal was a brief sinusoid; its uncertain parameter was frequency. Detection performance is predicted from data on a signal of known and constant frequency, as a function of the number of frequencies the uncertain signal could assume. A comparison condition presented a signal that varied in a manner not permitting adaptation. Models derived from signal detection theory describe the ideal observation processes for the three signal conditions, and supply quantitative predictions of relative performances. The models are generally supported by the data.
Swets, J. A.↗
Bidirectional Manchester repeater
Bidirectional Manchester repeater is inserted at periodic intervals along single bidirectional twisted pair transmission line to detect, amplify, and transmit bidirectional Manchester 11 code signals. Requiring only 18 TTL 7400 series IC's, some line receivers and drivers, and handful of passive components, circuit is simple and relatively inexpensive to build.
Ferguson, J.↗
Repeater in the sky
The Public Service Communications Satellite (PSCS) program is intended to develop and demonstrate a space system aimed at stimulating future commercial markets in fixed and mobile applications. The services are envisioned for rural areas, regions beyond access to terrestrial systems, or for continuous cross-country applications. The system incorporates a UHF repeater for mobile voice and data experiments; 8 MHz of spectrum is specified for serving 70 channels. This paper describes the PSCS program and discusses some demonstration experiments. A future concept based on large structure multibeam antennas is also discussed.
Cote, C. E.↗