Estimating and explaining the spread of COVID-19 at the county level in the USA
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Anthony R. Ives↗
SEARCH · Engineering Papers
Results for “Spread”
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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Evaluating Observational Constraints on Intermodel Spread in Cloud, Temperature, and Humidity Feedbacks
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Haozhe He↗
Tracking Acid Generating Minerals and Trace Metal Spread from Mines using Hyperspectral Data: Case Studies from Northwest India
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W. H. Farrand↗
Dust spreading in debris discs: do small grains cling on to their birth environment?
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Nicole Pawellek↗
Quantitative infrared image analysis of simultaneous upstream and downstream microgravity flame spread over thermally thin cellulose fuel in low speed forced flow
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Sandra Olson↗
Self-shading and meltwater spreading control the transition from light to iron limitation in an Antarctic coastal polynya
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Andrew G Twelves↗
The Spread of the Hunga Tonga H 2 O Plume in the Middle Atmosphere Over the First Two Years Since Eruption
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Gerald E. Nedoluha↗
Lateral-spread sonic-boom ground-pressure measurements from airplanes at altitudes to 75,000 feet and at mach numbers to 2.0
Measurements of shock wave overpressures from airplanes at altitudes to 75,000 feet & supersonic speed
HIGH ALTITUDE PRESSURE↗
Evidence of surface waves and spreading of turbulence on ablating models.
Surface modifications of recovered small-scale plastic models after high speed flight used to estimate extent of laminar and turbulent flow over surface related to ablation studies
ABLATING NOSE CONE↗
Desensitizing of microcircuits to variations in temperature and production spread. Phase III - Computer aided sensitivity analysis
Desensitizing microcircuits to variations in temperature and performance parameters - computer aided sensitivity analysis
MICROCIRCUIT↗
Flame spreading at elevated pressures over the surface of igniting solid propellants and propellant ingredients in oxygen/inert environments Annual report
Mathematical analysis of flame propagation at high pressures over surface of igniting solid propellants and propellant ingredients in oxygen/inert atmospheres
Magee, R. S.↗
The world wide spread of space technology
Space technological capabilities and developments in US, USSR, Western Europe, Japan, China, and developing nations
Hoagland, J. H.↗
Doppler frequency spread correction device for multiplex transmissions
Doppler frequency shift correction device for multiplex communication with Applications Technology Satellites
Lipke, D. W.↗
Penetration and spreading of transverse jets of hydrogen in a Mach 2.72 airstream
Schlieren photography of flow distribution for transverse hydrogen jets from flat plate into Mach 2.72 airstream
Billig, F. S.↗
On the cause of equatorial spread F.
It is suggested that convective electric fields in the equatorial ionosphere are generated by neutral winds (zonal or meridional) which act on regions having structure in their field aligned Pedersen conductivity integrals. The conductivity structure is presumably caused by long-lived metallic ions concentrated irregularly below the F layer at altitudes where their collision and gyrofrequencies are comparable. The resulting plasma convection leads to large-scale irregularities and sets up gradients in the electric field that drive other instability mechanisms to produce small-scale irregularities. The mechanism proposed requires a different velocity above and below 200 km for winds in the magnetic east-west direction, but for winds in the magnetic meridian direction, an altitude gradient is not required.
Hanson, W. B.↗
Investigation at Mach number 1.91 of spreading characteristics of jet expanding from choked nozzles
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Rousso, M. D.↗
Aerodynamic drag and fuel spreading measurements in a simulated scramjet combustion module
The drag of a simulated scramjet combustion module was measured at Mach 2, 2.5, and 3. The combustor was rectangular in cross section and incorporated six swept fuel injector struts. The effect of strut leading edge radius, position of maximum thickness, thickness ratio, sweep angle, and strut length on the drag was determined. Reduction in thickness ratio had the largest effect on drag reduction. Sweeping the struts upstream yielded the same drag as sweeping the struts downstream and potentially offers the advantages of increased mixing time for the fuel. Helium injection was used to simulate hydrogen fuel. The interstrut spacing required to achieve good distribution of fuel was was found to be about 10 jet diameters. The contribution of helium injection to drag reduction was small.
Povinelli, L. A.↗
Top side ionospheric spread F and particle precipitation in the day side magnetospheric clefts
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Dyson, P. L.↗