Flow-swallowing enthalpy probes in low-density plasma streams.
Flow swallowing enthalpy probes for low density plasma gas flows in constricted arc heated facility, discussing attached shock system
Anderson, L. A.↗
SEARCH · Search NASA
Results for “constriction”
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.
Total radiation measurements at the stagnation point of blunt bodies at stagnation temperatures to 15,000 deg K.
Blunt bodies stagnation point radiation intensity measurements in supersonic flow at very high stagnation temperatures generated by constricted arc heaters
Winovich, W.↗
Magnetomotive forming for precision sizing and joining of large-diameter tubes
Portable electromagnetic coil enables high precision expansion or constriction and joining of large diameter metal tubes. A nonconducting mandrel or forming die is used on the side of the tubes wall opposite the coil. The coil is insulated from the tube by a thin plastic sleeve.
Bennight, J. D.↗
Controlled substrate cooling improves reproducibility of vapor deposited semiconductor composites
Improved substrate holder preferentially provides more uniform substrate cooling and increases the proportion of vapor flowing over the substrate during growth. Nitrogen gas is constricted in the substrate holder to cool the substrate.
Clough, R.↗
Simplified computation of compressible fluid flow parameters
Mathematical techniques analyze fluid flow through circular duct, enlarged or constricted circular duct, and across an orifice or nozzle. Using subsonic Mach number as basic flow parameter, a series of working graphs displays the variation of various physical parameters in each of the flow conditions.
Beimgraben, H. W.↗
Method and apparatus for precision sizing and joining of large diameter tubes Patent
Method and apparatus for portable high precision magnetomotive bulging, constricting, and joining of large diameter metal tubes
Bennight, J. D.↗
Method and apparatus for precision sizing and joining of large diameter tubes Patent
Method and apparatus for precision sizing and joining of large diameter tubes by bulging or constricting overlapping ends
Bennight, J. D.↗
Direction effect in thermal contact conductance
Thermal conductance of contacts between dissimilar solids with interstitial fluids, calculating heat flow direction effect by double constriction model
Chandra, S.↗
Plasma refractive effects in HCN lasers
Plasma refractive index effects in pulsed HCN lasers, calculating stable cavity mirror curvatures constriction as function of electron density by ray matrix approach
Mccaul, B. W.↗
Assessment of renal hemodynamic factors in whole kidney glomerulotubular balance
Renal hemodynamic factors in whole kidney glomerulotubular balance in anesthetized dogs by manipulating filtration rate through constriction of aorta, thoracic vena cava, etc
Daugharty, T. M.↗
Pupillary responses during a short-term memory task - Cognitive processing, arousal, or both
Eye pupil response during short term memory task, noting postsignal cycle of dilation-constriction
Johnson, D. A.↗
Pulsed high-power arc heater with improved cathode and triggering mechanism
System employs pulsed, constricted arc heater capable of multi-MW power, permitting quasi-stationary flow conditions during latter half of pulse of about 5 msec. System description is given.
Dethlefsen, R.↗
Improved high-performance shock tube
Mylar diaphragms in shock tubes are a major improvement over steel diaphragms. Other improvements include: better electrode design; improved flow by opening the throat and removing all constrictions; and improved driver geometry by optimizing volume and shape.
Menard, W. A.↗
Radioactive nondestructive test method
Various radioisotope techniques were used as diagnostic tools for determining the performance of spacecraft propulsion feed system elements. Applications were studied in four tasks. The first two required experimental testing involving the propellant liquid oxygen difluoride (OF2): the neutron activation analysis of dissolved or suspended metals, and the use of radioactive tracers to evaluate the probability of constrictions in passive components (orifices and filters) becoming clogged by matter dissolved or suspended in the OF2. The other tasks were an appraisal of the applicability of radioisotope techniques to problems arising from the exposure of components to liquid/gas combinations, and an assessment of the applicability of the techniques to other propellants.
Obrien, J. R.↗
Magnetic coercivity and ferromagnetic species in lunar materials
Lunar samples have reduced coercive force, high values of R sub H (ratio of remanent coercive force to coercive force), and constriction in their magnetic hysteresis loops due to the presence of superparamagnetic and multidomain iron grains. The high R sub H values are also attributable to the magnetic shape effects of the iron grains. Spheres, cubes, and needles, as well as more irregular metal grains were observed. The coercive force values are quite meaningless unless the size and shape distributions are determined. The R sub H and the ratio of saturation remanence to saturation magnetization values can be considered characteristic of the size and shape modes of the ferromagnetic grains in a natural sample, and a classification of natural materials based on their hysteresis characteristics is presented with special reference to lunar samples.
Wasilewski, P.↗
Generation of a uranium plasma at near gaseous core reactor conditions.
A constricted sliding spark discharge is used to generate a high density, high temperature uranium plasma. Uranium particle densities up to 10 to the 20th power per cu cm are obtained over a temperature range of 30,000 to 50,000 K. The device consists of a capillary discharge channel lined with pressed and sintered UO2. A 250 joule capacitor bank is discharged into the channel, producing a plasma of 10-20 microsec duration. Spectroscopic observations are made over the spectral range of 1300 to 2500 A.
Davis, J. F., III↗
Ultrastructure of Pseudomonas saccharophila at early and late log phase of growth.
Description of the fine structure of Pseudomonas saccarophila at the early log phase and the late log phase of growth, such as shown by electron microscopy with the aid of various techniques of preparation. The observations reported suggested that, under the experimental conditions applied, P. saccharophila multiplies by the method of constrictive division.
Young, H. L.↗
Splanchnic blood flow and plus or minus Gx acceleration.
Experimental data show that there is a neurogenic response to acceleration stress in the front to back direction and that this response is intensified during higher accelerative forces. The afferent limb of this response is unknown but possibilities are suggested. The integrated response at high acceleration levels might serve to conserve oxygen during the stress time. The effector limb is the constriction of less critical vascular beds to preserve blood flow to the heart and brain. The concomitant increase in vagal activity causes a slowing down of the heart.
Stone, H. L.↗