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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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Comparative pathology of animals continuously exposed to varied concentrations of carbon tetrachloride vapor in altitude chamber
Conducting plant research to assess the impact of microgravity on plant growth and development requires a plant chamber that has the capability to control other environmental parameters involved in plant growth and development. The environmental control in a space-based plant chamber must be equivalent to that available in such facilities used for terrestrial plant research. Additionally, plants are very sensitive to a number of atmospheric gaseous materials. Thus, the atmosphere of a plant chamber must be isolated from the space vehicle atmosphere, and the plant growth unit should have the capability to remove any such deleterious materials that may impact plant growth and development. The Wisconsin Center for Space Automation and Robotics (WCSAR), University of Wisconsin-Madison, has developed a totally enclosed controlled environment plant growth unit. The flight unit was used to support the ASTROCULTURE(TM) experiment conducted during the USML-2 mission. The experiment had two major objectives: 1) Provide further validation of the flight unit to control the experiment-defined environmental parameters in the plant chamber, and 2) support a plant experiment to assess the capability of potato plant material to produce tubers in microgravity. This paper describes the temperature, humidity, and carbon dioxide conditions of the plant chamber during the mission, from launch to landing. Another paper will present the plant response data.
A methyl acetate reactor was developed to perform a subscale kinetic investigation in the design and optimization of a full-scale metabolic simulator for long term testing of life support systems. Other tasks in support of the closed ecological life support system test program included: (1) heating, ventilation and air conditioning analysis of a variable pressure growth chamber, (2) experimental design for statistical analysis of plant crops, (3) resource recovery for closed life support systems, and (4) development of data acquisition software for automating an environmental growth chamber.
A test system is disclosed that enables the testing of microwave components in a controlled environment without disturbing that environment. The system includes a test fixture which holds the calibration standards and the component being tested, and environmental control chamber, and a microwave switching system. The system provides a coaxial connection to microwave testing equipment, such as an automatic network analyzer (ANA) and facilitates both calibration and testing while maintaining environmental integrity.
Man-rated space simulation facility, emphasizing checkout and qualification of systems
Controlled environment chamber for testing cavitation damage resistance of refractory alloys in pure liquid sodium
Test chamber to simulate vacuum and heat sink characteristics of space, measuring optical constants of coatings
The long term effects of encapsulation individual sheets of the Codex Hammer were investigated. The manuscript was simulated with similar sheets of paper which were photographed under repeatable raking light conditions to enhance their surface texture, encapsulated in plexiglas, cycled in an environmental test chamber, and rephotographed at selected intervals. The film images were digitized, contrast enhanced, geometrically registered, and apodized. An FFT analysis of a control sheet and two experimental sheets indicates no micro-burnishing, but reveals that the ""mesoscale'' deformations with sizes 8mm are degrading monotonically, which is of no concern. Difference image analysis indicates that the sheets were increasingly stressed with time and that the plexiglas did not provide a sufficient environmental barrier under the simulation conditions. The relationship of these results to the Codex itself is to be determined.
Survey of large space chambers - vacuum chambers to simulate space environment
Long-term human behavior study in programmed environment
Detonability of gaseous hydrogen-oxygen mixtures under selected environmental conditions
Simulated space vacuum environment by cryosorption pumping system
Spontaneous ignition and reaction characteristics of hypergolic propellant pair in low pressure and temperature environment, specifically hydrazine fuel and nitrogen tetroxide atmosphere
System for prolonged exposure of small animals to low-pressure high-oxygen environments
Circadian cycles in human subjects during prolonged isolation in constant environment using eight channel telemetry systems
Rarefied gas dynamics, environmental measurements at ultrahigh altitudes, and aerodynamic test facility improvement studies
Simulated space vacuum environment by cryosorption pumping system
Microbiological effects of oxygen atmosphere and space diet on human intestinal and skin flora