The 30-MB synoptic analyses for the 1969 Southern Hemisphere winter derived with the aid of Nimbus 3 /SIRS/ data
Southern Hemisphere winter 30-MB synoptic analysis derived with aid of Nimbus 3 /SIRS/ data in 1969
Finger, F. G.↗
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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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Study of X-ray emission from selected regions of the Southern Hemisphere sky Summary report
Acquisition and processing of X ray data from Southern Hemisphere sky
Bowyer, C. S.↗
Convective heat-transfer rates on a blunted 110 deg cone with hemispherical afterbody at hypersonic speeds
Measurement of convective heat transfer rates on conical nosecap and hemispherical afterbody configuration at hypersonic speed
Stewart, D. A.↗
Measurements of total hemispherical emittance for chromel and for alumel wires
Measurement of total hemispherical emittance for chromel and alumel thermocouple wires in inert atmosphere at high temperatures
Harvey, W. D.↗
Mars - Detection of atmospheric water vapor during the southern hemisphere spring and summer season
Mars atmospheric water vapor detection during Southern Hemisphere spring and summer season
Barker, E. S.↗
Weak X-ray sources in the Southern Hemisphere
Galactic weak X ray sources observation in Southern Hemisphere for flux and energy spectrum
Buselli, G.↗
A digital computer study of the buckling of shallow spherical caps and truncated hemispheres
A study of the buckling of thin shells was conducted using a digital computer program for the geometrically nonlinear analysis of arbitrarily loaded shells of revolution. The objective was an evaluation of the program's applicability to bifurcation buckling and imperfection sensitivity analysis. Clamped spherical caps under pressure loading and clamped truncated hemispheres under axial tension were investigated. Buckling loads were determined for axisymmetric and nearly axisymmetric loads and are compared with previously published analytical results based on geometric imperfections.
Stilwell, W. C.↗
Outlet baffles: Effect on liquid residuals from zero-gravity draining of hemispherically ended cylinders
An experimental investigation was conducted to study the relative effectiveness of various outlet baffles in reducing liquid residuals resulting from the draining of hemispherically ended cylindrical tanks in a weightless environment. Three different baffles were employed. The relative effectiveness of each baffle was determined by comparing the results obtained, in the form of liquid residuals, with results for an unbaffled tank. Data indicate that all the baffles tested reduced residuals. Reductions betweem 10 and 60 percent were obtained, depending on baffle geometry and outlfow Weber number.
Symons, E. P.↗
Heat transfer and pressure distributions on hemisphere-cylinders in methane-air combustion products at Mach 7
Heat-transfer and pressure distributions were measured over the surfaces of three hemisphere-cylinder models tested at a nominal Mach number of 7 in the Langley 8-foot high-temperature structures tunnel which uses methane-air products of combustion as a test medium. The results showed that the heat-transfer and pressure distributions over the surface of the models were in good agreement with experimental data obtained in air and also with theoretical predictions.
Weinstein, I.↗
Heat transfer characteristics of a single circular air jet impinging on a concave hemispherical shell
An experimental study was made of the local and average heat-transfer characteristics of a single turbulent air jet impinging on the concave surface of a hemisphere. Correlations were developed for expressing the effects of a number of dimensionless variables on the local and average Nusselt numbers. Results of the present study are compared with those from a similar study concerning a concave surface of a semicylindrical shell.
Livingood, J. N. B.↗
Elastic pd scattering at 316, 364, 470, and 590 MeV in the backward hemisphere.
The elastic pd differential cross section at center-of-mass angles between 91 and 164 deg was determined for 316, 364, 470, and 590 MeV proton scattering in a backward hemisphere. For the three largest energies, the cross sections were within 10% of each other at any given angle larger than 130 deg. The extrapolated 180 deg differential cross section remained nearly constant from 316 to 590 MeV.
Alder, J. C.↗
The 100 micron surveys in the Northern and Southern Hemispheres
Partial surveys in the far infrared in the Northern and Southern Hemispheres have covered 40% of the galactic equator and assorted regions away from the galactic plane. Approximately 120 100-micron objects are known. These are distributed extensively in galactic longitude and concentrated within + or - two degrees in galactic latitude. From this information, some general conclusions can be drawn about the sensitivity and coverage required for a general sky survey in the far infrared.
Hoffmann, W. F.↗
Evaluation of a hemispherical head flow direction sensor for inlet duct measurements
A hemispherical head flow direction sensor was tested in a wind tunnel to evaluate its effectiveness for measuring dynamic duct flow direction angles of plus and minus 27 degrees. The tests were conducted at Reynolds numbers of 3.8 million per meter (1.0 million per foot) and 4.92 million per meter (1.5 million per foot) and at Mach numbers from 0.30 to 0.70. The design criteria for the probe are discussed and the wind tunnel results are presented. Three techniques for deriving the flow angles are described.
Bennett, D. L.↗
A numerical circulation model with topography for the Martian Southern Hemisphere
A quasi-geostrophic numerical model, including friction, radiation, and the observed planetary topography, is applied to the general circulation of the Martian atmosphere in the Southern Hemisphere at latitudes south of about 35 deg. Near equilibrium weather systems developed after about 5 model days. To avoid violating the quasi-geostrophic approximation, only 0.8 of the already smoothed relief was employed. Weather systems and velocity fields are strikingly tied to topography. A 2mb middle latitude jet stream is found of remarkably terrestrial aspect. Highest surface velocities, both horizontal and vertical, are predicted in western Hellas Planitia and eastern Argyre Planitia, which are observed to be preferred sites of origin of major Martian dust storms. Mean horizontal velocities and vertical velocities are found just above the surface velocity boundary layer.
Mass, C.↗
On hemispheric differences in evoked potentials to speech stimuli
Subjects were asked to count the number of times a 'target' sound occurred in lists of speech sounds (pa or ba) or pure tones (250 or 600 c/sec) in which one of the sounds (the 'frequent') appeared about four times as often as the target. The response to both targets and frequents were separately averaged from electrodes at vertex at symmetrical left and right parietal locations. The expected sequence of deflections, including P3 waves with about 350 msec latency, was found in the responses to target stimuli. Very little difference was found between the right and left hemispheric responses to speech or pure tones, either frequent or target.
Galambos, R.↗
A numerical circulation model with topography for the Martian southern hemisphere
A two-level numerical model taking account of the observed planetary topography is applied to the general circulation of the Martian atmosphere in the southern hemisphere. The physics of this model is based on the assumption of a hydrostatic quasi-geostrophic ideal-gas atmosphere composed entirely of carbon dioxide; radiative transfer among the atmosphere, space, and the ground is included along with surface friction. The calculations indicate the development of near-equilibrium weather systems after about five model days, weather systems and velocity fields whose positions appear to be connected with topography, and a midlatitude jet stream strikingly similar to the terrestrial case. The results also suggest that the vertical and horizontal wind components in western Hellas and eastern Argyre produce copious amounts of suspendible dust each year, that both major and minor dust storms should be a common occurrence on Mars, and that the entire south circumpolar zone appears to be a dust sink in winter.
Mass, C.↗
A large hemispherical chamber for fire toxicity tests
The paper describes an 84-liter chamber for fire toxicity tests consisting of an upper hemispherical dome section with a diameter of 533 mm, made of clear polymethyl methacrylate and a lower cylindrical base section 190 mm deep, made of cast aluminum. The chamber is designed to expose 36 mice, 8 rats, 4 rabbits or combinations of smaller numbers of two or three species simultaneously to the gaseous products of pyrolysis or combustion. The chamber does not appear to be suitable for screening purposes because its large size introduces operating costs and problems which reduce its cost effectiveness.
Hilado, C. J.↗
PECHCV, PECHFV, PEFHCV and PEFHFV: A set of atmospheric, primitive equation forecast models for the Northern Hemisphere, volume 3
As part of the SEASAT program of NASA, a set of four hemispheric, atmospheric prediction models were developed. The models, which use a polar stereographic grid in the horizontal and a sigma coordinate in the vertical, are: (1) PECHCV - five sigma layers and a 63 x 63 horizontal grid, (2) PECHFV - ten sigma layers and a 63 x 63 horizontal grid, (3) PEFHCV - five sigma layers and a 187 x 187 horizontal grid, and (4) PEFHFV - ten sigma layers and a 187 x 187 horizontal grid. The models and associated computer programs are described.
Wellck, R. E.↗