Regional slopes with non-stereo radar.
Regional slope measurement from two monoscopic radar images of same terrain area, discussing accuracy and applications to geomorphology and hydrology
Dalke, G. W.↗
SEARCH · Engineering Papers
Results for “Slope”
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.
An extension of the slope-facet model of radar backscatter from the sea
Extension of slope-facet model of radar backscatter from sea
Rouse, J. W., Jr.↗
Slope diffraction analysis of TEM parallel- plate guide radiation patterns
Parallel plate TEM waveguides radiation pattern slope diffraction analysis
Rudduck, R. C.↗
T.V. data compression by a decaying slope threshold method
Data compression for telemetry transmission with sample choice based on time-varying stream slope thresholds illustrated for Ranger photograph
Kleinrock, L.↗
Slope discontinuities in pressure vessels
Shell of revolution /pressure vessel/ with meridional slope discontinuity, calculating pressurization effect on stresses by computer program
Skogh, J.↗
Multiple slope sweep generator Patent
Transistorized circuit for producing multiple slope voltage sweep
Woolfson, M. G.↗
Mechanical interaction of a driven roller /wheel/ on soil slopes. The necessary conditions for an equilibrium-velocity solution, part 1
Mobility performance problem of power-driven rigid cylindrical roller /wheels/ climbing semi-infinite soft soil slope with uniform velocity applied to lunar locomotion
Kloc, I.↗
Lunar slope distributions - Comparison of bistatic-radar and photographic results
Lunar surface slopes distributions from bistatic radar, photogrammetric and photoclinometric measurements by Explorer 35, Surveyor, Lunar Orbiter and Apollo spacecraft
Moore, H. J.↗
Determination of the sea surface slope distribution and wind velocity using sun glitter viewed from a synchronous satellite
Sea surface slope distribution and wind velocity determination by sun glitter photography from synchronous satellite
Levanon, N.↗
Lunar surface engineering properties experiment definition. Volume 2: Mechanics of rolling sphere-soil slope interaction
The soil deformation mode under the action of a rolling sphere (boulder) was determined, and a theory based on actual soil failure mechanism was developed which provides a remote reconnaissance technique for study of soil conditions using boulder track observations. The failure mechanism was investigated by using models and by testing an instrumented spherical wheel. The wheel was specifically designed to measure contact pressure, but it also provided information on the failure mechanism. Further tests included rolling some 200 spheres down sand slopes. Films were taken of the rolling spheres, and the tracks were measured. Implications of the results and reevaluation of the lunar boulder tracks are discussed.
Hovland, H. J.↗
Operational slope-limiting circuit
Circuit limits slope of arbitrary waveform to avoid exceeding rate limit of subsequent amplifier, or to form trapezoidal wave with adjustable rise and fall rates from square wave of arbitrary frequency. Integrator provides delay needed to develop output waveform. DC coupling is used to preserve original dc offset.
Engel, A.↗
Data compression by a decreasing slope-threshold test
Resolution can be obtained at large compression ratios with method for selecting data points for transmission by telemetry in television compressed-data system. Test slope of raw data stream and compare it to symmetric pair of decreasing thresholds. When either threshold is exceeded, data are sampled and transmitted; thresholds are reset, and test begins again.
Kleinrock, L.↗
Air-cushion tankers for Alaskan North Slope oil
A concept is described for transporting oil from the Arctic to southern markets in 10,000-ton, chemically fueled air-cushion vehicles (ACV's) configured as tankers. Based on preliminary cost estimates the conceptual ACV tanker system as tailored to the transportation of Alaskan North Slope oil could deliver the oil for about the same price per barrel as the proposed trans-Alaska pipeline with only one-third of the capital investment. The report includes the description of the conceptual system and its operation; preliminary cost estimates; an appraisal of ACV tanker development; and a comparison of system costs, versatility, vulnerability, and ecological effect with those of the trans-Alaska pipeline.
Anderson, J. L.↗
Asteroid reflectivities from polarization curves - Calibration of the 'slope-albedo' relationship.
The relationship between h, the slope of the positive branch of a polarization curve, and A, the normal reflectance of the surface, has been calibrated using a wide range of published data. It is determined that asteroid albedos can be inferred meaningfully by this method without prior knowledge of the detailed mineralogical composition of asteroid surfaces.
Veverka, J.↗
The elevation, slope, and curvature spectra of a wind roughened sea surface
The elevation, slope and curvature spectra are defined as a function of wave number and depend on the friction velocity. There are five wave number ranges of definition called the gravity wave-gravity equilibrium range, the isotropic turbulence range, the connecting range due to Leykin Rosenberg, the capillary range, and the viscous cutoff range. The higher wave number ranges are strongly wind speed dependent, and there is no equilibrium (or saturated) capillary range, at least for winds up to 30 meters/sec. Some properties of the angular variation of the spectra are also found. For high wave numbers, especially in the capillary range, the results are shown to be consistent with the Rayleigh-Rice backscattering theory (Bragg scattering), and certain properties of the angular variation are deduced from backscatter measurements.
Pierson, W. J., Jr.↗
Differences in radar return from ice-covered North Slope Lakes
Comparisons are made between L and X band synthetic aperture radar images of frozen lakes on the North Slope of Alaska and ground truth observations of the nature of their ice covers. It is shown that the differences in radar backscatter observed on different areas of a lake can be correlated with whether or not the lake is frozen completely to the bottom at the site in question. This explanation is reasonable inasmuch as the reflection coefficient associated with the high-dielectric contrast ice/water interface is significantly higher than that associated with a low-contrast ice/soil interface. However, the presence of the ice/water interface cannot be the only condition required for the higher backscatter because the ice/water interface per se would be specular at X and L band frequencies, causing the energy returned from the interface to be reflected away from the radar receiver. The other principal factor contributing to the return of energy from the ice/water interface to the receiver is believed to be the presence in the ice of numerous vertically elongated air bubbles which would act as scatters.
Weeks, W. F.↗