Destructive breakdown in thin films of SiO, MgF sub 2, CaF sub 2, CeF sub 3, CeO sub 2, and Teflon.
Prebreakdown and breakdown electrical properties and light emission during destructive breakdown in thin film capacitors
Budenstein, P. P.↗
SEARCH · Engineering Papers
Results for “DESTRUCTION”
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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Free radical destruction by gamma-irradiation at 77 K.
Free radicals destruction rates by gamma irradiation at 77 K measured as first order function of dosage, using electron spin resonance spectroscopy
Horan, P. K.↗
Mariner Mars 1971 spacecraft destruct unit
Shaped charge destruct unit for Mariner Mars 1971 spacecraft
Davis, D. P.↗
Specific destruction of the O2 evolving reactions and the photorestoration of O2 evolution Quarterly status report, 6 Apr. - 21 Jul. 1970
Irreversible destruction of O2 evolving reactions and photorestoration of O2 evolution
Source record↗
Apollo range safety destruct time delay, Saturn 1B and Saturn 5
Safe destruct time and range safety time delay for Saturn 1B and Saturn 5 from pad to 40,000 feet
Teixeira, C.↗
Response of Scout destruct charges to high heat fluxes
Scout missile destruct charge system premature operational response to high temperature environment caused by combustion gas leak during stage separation
Bottorff, J. A.↗
Free radical destruction by gamma-irradiation at 77 deg K
Free radical destruction by gamma irradiation in organic solids at low temperature measured by electron spin resonance spectroscopy, noting dosage relationship
Horan, P. K.↗
Destruction of dirty ice mantles by sputtering
Dirty ice mantles are destroyed efficiently by sputtering of He atoms when clouds encounter shock velocities greater than 13-15 km/sec. Destruction due to grain-grain collisions is found to be about .001 times less efficient. Sputtering in the hot intercloud medium should make intercloud grains smaller than cloud grains.
Aannestad, P. A.↗
Stratospheric ozone destruction by man-made chlorofluoromethanes
Calculations indicate that chlorofluoromethanes produced by man can greatly affect the concentrations of stratospheric ozone in future decades. This effect follows the release of chlorine from these compounds in the stratosphere. Present usage levels of chlorofluoromethanes can lead to chlorine-catalyzed ozone destruction rates that will exceed natural sinks of ozone by 1985 or 1990.
Cicerone, R. J.↗
The hard start phenomena in hypergolic engines. Volume 5: RCS engine deformation and destruct tests
Tests were conducted to determine the causes of Apollo Reaction Control (RCS) engine failures. Stainless steel engines constructed for use in the destructive tests are described. The tests conducted during the three phase investigation are discussed. It was determined that the explosive reaction that destroys the RCS engines occurs at the time of engine ignition and is apparently due to either the detonation of the heterogeneous constituents of the rocket engine, consisting primarily of unreacted propellant droplets and vapors, and/or the detonation of explosive materials accumulated on the engine walls from previous pulses. Photographs of the effects of explosions on the simulated RCS engines are provided.
Miron, Y.↗
Destruction of the recreational, asthetic, agricultural, wildlife conservation and preservation, and residential uses of the land as a result of the abuses of the manufacturing, commercial, extractive, construction, and transportation industries
Explicit concern over land use and abuse stems from the recognition of the negative impacts of unrestrained and unregulated economic, industrial, and population growth upon finite land resources. Only one quarter of the total surface area of the earth is land, and of that a large portion is uninhabitable. The present stresses upon the land include urbanization, urban sprawl and urban congestion; electrical, nuclear industrial park siting requirements; land degradation through stripping surface minerals; land degradation through disposal of radioactive wastes, sewage sludge, solid waste and other industrial wastes; rising demand for agricultural land; and the erosion and destruction of land through elimination of protective coverings such as forests, grasslands, and wetlands.
Source record↗
NO sub X destruction by CO in NO sub X to NO converters of chemiluminescent NO analyzers
An instrument modification for chemiluminescent NO - NOx analyzers was developed which minimizes the NOx destruction in the NOx to NO converters of NO analyzers due to high concentrations of CO. This mechanism causes the NO analyzers to indicate incorrect NOx concentrations when the analyzers are operated in the NOx analysis mode. The modification is applicable to analyzers in which the detection chamber is evacuated.
Summers, R. L.↗
Effect of combined heat and radiation on microbial destruction
A series of experiments at several levels of relative humidity and radiation dose rates was carried out using spores of Bacillus subtilis var. niger to evaluate the effect of heat alone, radiation alone, and a combination of heat and radiation. Combined heat and radiation treatment of microorganisms yields a destruction rate greater than the additive rates of the independent agents. The synergistic mechanism shows a proportional dependency on radiation dose rate, an Arrhenius dependence on temperature, and a dependency on relative humidity. Maximum synergism occurs under conditions where heat and radiation individually destroy microorganisms at approximately equal rates. Larger synergistic advantage is possible at low relative humidities rather than at high relative humidities.
Fisher, D. A.↗
The main peculiarities of the processes of the deformation and destruction of lunar soil
The main results of study of the physical and mechanical properties of lunar soil, obtained by laboratory study of samples returned from the moon by Luna 16 and Luna 20, as well as by operation of the self-propelled Lunokhod 1 and Lunokhod 2 on the surface of the moon, are analyzed in the report. All studies were carried out by single methods and by means of unified instruments, allowing a confident comparison of the results obtained. The investigations conducted allowed the following values of the main physical-mechanical properties of lunar soil to be determined: in the natural condition the solid density corresponds to the porosity of 0.8; the modal value of the carrying capacity is 0.4 kg/square cm; adhesion is 0.04 to 0.06 kg/square cm; and the internal angle of friction is 20 to 25 degree. The main mechanisms of deformation and destruction of the soil are analyzed in the report, and the relationships between the mechanical properties and physical parameters of the soil are presented.
Leonovich, A. K.↗
Cold shivering activity after unilateral destruction of the vestibular apparatus
The bioelectric activity of muscles (flexors and extensors of the forelimbs and hindlimbs) during cold shivering after unilateral destruction of the vestibular apparatus. It was found, that unilateral delabyrinthing produces bilateral facilitation of cold shivering in the flexor extremities more pronounced on the ipsilateral side. In the extensor muscles there was an absence of bioelectric activity both before and after delabyrinthing. Enhancement of cold shivering in the flexor extremities following intervention was evidently conditioned by removal of the inhibiting effect of the vestibulary apparatus on the function of special centers.
Kuzmina, G. I.↗
Supercritical water oxidation for wastewater treatment Preliminary study of urea destruction
Supercritical water oxidation is being investigated as a method of treating spacecraft wastewater for recycle. In this process, oxidation is conducted in an aqueous phase maintained above the critical temperature (374 C) and pressure (215 bar) of water. Organic materials are oxidized with efficiencies greater than 99.99 percent in residence times of less than 1 minute. This paper presents preliminary results for urea destruction. Above 650 C, urea can be completely broken down to nitrogen gas, carbon dioxide and water by supercritical water oxidation, without the use of a specific catalyst.
Timberlake, S. H.↗
Apparatus and method for destructive removal of particles contained in flowing fluid
An apparatus and method for destructively removing particles from a flowing gas containing the particles is described. In the specific embodiments disclosed the apparatus is adapted to remove carbon particles from diesel engine exhaust products. The exhaust products are directed to a predetermined location where they are rapidly vaporized and combine with oxygen in the exhaust products to form carbon dioxide. Vaporization in one embodiment is effected by a discharge grid located within an exhaust conduit, the grid being chosen so that alternate conductors defining the grid are spaced apart a distance approximately 125 times the mean diameter of the particles to be removed. A voltage differential of approximately 690 volts is applied across adjacent conductors.
Yang, L. C.↗
Grain destruction in interstellar shocks
The destruction of interstellar grains by nonthermal sputtering, thermal sputtering, and grain-grain collisions is discussed. It is concluded that large grains are easily destroyed by shocks in the interstellar medium, but that small grains are much more persistent. Since the MRN model has many more small grains than large ones, this means that the total number of grains is not significantly reduced even when half or more of the grain material is returned to the gas phase. Thus, the small grains are always available as condensation cores for mantle formation or redepletion of refractory grain materials.
Seab, C. G.↗