Nanosatellite design principles and concepts
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nanosatellites↗
Engineering topics
West, J.
Publications and source records attributed to West, J..
Plasma Sodium-Osmotic Dissociation and Hormonal Interaction with Drinking-Induced Hypervolemia at 2800 m Altitude
Dissociation between beverage sodium [Na(+)] and osmotic [Osm] concentrations for increasing plasma volume (PV, hypervolemia) appears to refute the high theoretical correlation between plasma [pNa(+)] and [pOsm].
Greenleaf, J. E.↗
Experiment/Analytical Characterization of the RBCC Rocket-Ejector Mode
Experimental and complementary CFD results from the study of the rocket-ejector mode of a Rocket Based Combined Cycle (RBCC) engine are presented and discussed. The experiments involved systematic flowfield measurements in a two-dimensional, variable geometry rocket-ejector system. The rocket-ejector system utilizes a single two-dimensional, gaseous oxygen/gaseous hydrogen rocket as the ejector. To gain a thorough understanding of the rocket-ejector's internal fluid mechanic/combustion phenomena, experiments were conducted with both direct-connect and sea-level static configurations for a range of rocket operating conditions. Overall system performance was obtained through global measurements of wall static pressure profiles, heat flux profiles and engine thrust, whereas detailed mixing and combustion information was obtained through Raman spectroscopy measurements of major species (oxygen, hydrogen, nitrogen and water vapor). The experimental results for both the direct-connect and sea-level static configurations are compared with CFD predictions of the flowfield.
Ruf, J. H.↗
Hypovolemia During Early Exposure to 2,800 m Altitude: Effect of Rehydration
The mechanism for reduction of total body water and plasma volume (PV) during initial exposure to acute attitude (ALT) is not clear. Ten man (25+/-SD 3yr. 1.99+/-0.l9sq m) were confined (sitting) for 12 hr in a chamber a 2800m ALT or at 305m(ground). They ate a controlled breakfast (450 kcal + 3ml/kg H2O) on the ground, and lunch and dinner at ALT for a total daily intake of 2,850 kcal (14%PRO, 67%CHO, 16%FAT, 26gNaCl). At hr 10 they consumed fluid-electrolyte drinks or water (12ml/kg, 948ml/day) with sessions at weekly intervals: (a) 185mEq/L Na, 283mOsm/kg; (b) 21.6Na, 365mOsm: and (c) water at ALT: and (d) water on the ground. After 10 hr at ALT%(Delta)PV(Hb-Hct) decreased (P<0.05) by (a) 9.0+/-SE1.5%, (b) 6.2+/-1.7%, (c) 7.4+/-2.2%. and (d) 9.0+/-2.4%. respectively. After drinking at 1200 hr PV increased by (a) 8.3% (P<0.05), (b) 2.8% (NS), (c) -0.9% (NS). and (d) by 0.8% (NS). respectively. The ground-induced hypovolemia suggests a confinement rather than an ALT effect. The increase in PV after the NaCl-NaCitrate drink (a) indicates that drink composition is mom important than as Osm for restoring PV in these Conditions.
Greenleaf, J. E.↗
Ion Propulsion Module (IPM) technology readiness assessment: 1985 Halley's Comet rendezvous mission
An assessment of the risk of utilizing ion propulsion to perform a rendezvous mission with Halley's comet in 1985 is presented, and consideration recommendations for reducing identified risks to the lowest possible level at project start in October 1978 were made.
West, J.↗