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  • 1
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    Activity and adaptation of nitrilotriacetate (NTA)-degrading bacteria: field and laboratory studies (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Adaptation of bacterial activity for the degradation of nitrilotriacetate (NTA) was studied using natural sediment samples and an NTA-degrading bacterium (strain ATCC 29600). Sediment samples from a river with persistent levels of NTA had much higher NTA-degradative activity than comparable samples from a less contaminated control site. When sediment from the control site was exposed to high levels of NTA a 5 day lag preceded an abrupt increase in NTA degradation while strain 29600 colonized on sand and grown in the absence of NTA became induced within eight hours. The induction of strain 29600 was compared between bacteria in suspension and cells attached to sand. The sand-associated bacteria became induced 4 to 5 h before the planktonic suspension and displayed over threefold greater specific activity. Suspensions of strain 29600 became adapted within 8 h when placed in membrane diffusion chambers that were immersed within a municipal wastewater reactor containing NTA. These findings support the concept that induction is a part of the process of bacterial adaptation to degrade NTA and sand-associated bacteria can adapt more quickly to and have a greater degradative activity for NTA than planktonic cells.
    Keywords: Environment Pollution
    Type: Water research (ISSN 0043-1354); Volume 24; 7; 875-81
    Format: text
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  • 2
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    Enhancement of laser output by nuclear reactions (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Enhancement output power of CO-2 laser excited by electric discharge and irradiated by neutrons obtained from nuclear reactor
    Keywords: MASERS
    Type: RES. ON URANIUM PLASMAS AND THEIR TECHNOL. APPL. 1971; P 397-400
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  • 3
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    Generation of a fissioning plasma (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Measurements of radiation emission properties of uranium plasma
    Keywords: PHYSICS, PLASMA
    Type: RES. ON URANIUM PLASMAS AND THEIR TECHNOL. APPL. 1971; P 205-209
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  • 4
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    Boiling point of uranium (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Electrical characteristics data used to determine uranium plasma boiling point
    Keywords: MATERIALS, METALLIC
    Type: RES. ON URANIUM PLASMAS AND THEIR TECHNOL. APPL. 1971; P 181-185
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    University of Florida nuclear pumped laser program (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-17
    Description: The mechanism of excitation of laser gases by fast ions (triton, proton, or fission fragments) and especially any role UF6 might play in radiative deexcitation of these gases were investigated. Population densities of excited important for laser action were obtained. Nuclear pumped CW-laser systems, especially He-Ne and CO2, were studied using steady state reactors. It was demonstrated that He-Ne lases in a CW-mode with nuclear pumping at both the red and the infrared transition. The infrared transition was observed to be superradiant.
    Keywords: LASERS AND MASERS
    Type: NASA. Langley Res. Center Nucl.-Pumped Lasers; p 1-10
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  • 6
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    Measurement techniques for analysis of fission fragment excited gases (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Spectroscopic analysis of fission fragment excited He, Ar, Xe, N2, Ne, Ar-N2, and Ne-N2 have been conducted. Boltzmann plot analysis of He, Ar and Xe have indicated a nonequilibrium, recombining plasma, and population inversions have been found in these gases. The observed radiating species in helium have been adequately described by a simple kinetic model. A more extensive model for argon, nitrogen and Ar-N2 mixtures was developed which adequately describes the energy flow in the system and compares favorably with experimental measurements. The kinetic processes involved in these systems are discussed.
    Keywords: PLASMA PHYSICS
    Type: Princeton Univ. Partially Ionized Plasmas, Including the 3rd Symp. on Uranium Plasmas; p 80-90
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  • 7
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    Computerized spectrum analysis (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Automatic spectral data reduction and analysis system consisting of densitometer, analog-digital converter and IBM 1800 process computer with magnetic disk memory
    Keywords: CHEMISTRY
    Type: ; ACE(
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  • 8
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    Direct nuclear pumping of a helium-xenon laser (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Experiments attempting to achieve laser excitation by direct interaction of nuclear reaction products (fission fragments) with the lasing media are reported. Laser output followed reactor power surge by 50 microsec, the neutron thermalization time. The light output exhibited a threshold for onset and termination of laser action. The observed light output was shown to be caused by stimulated emission, because the signal disappeared when the totally reflecting (flat) mirror at one end of the apparatus was covered. Fission fragments were shown to be responsible for the stimulated emission, because the laser output disappeared when the U-235 liner was covered by an aluminum foil.
    Keywords: LASERS AND MASERS
    Type: Applied Physics Letters; 26; Mar. 15
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  • 9
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    Application of gaseous core reactors for transmutation of nuclear waste (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An acceptable management scheme for high-level radioactive waste is vital to the nuclear industry. The hazard potential of the trans-uranic actinides and of key fission products is high due to their nuclear activity and/or chemical toxicity. Of particular concern are the very long-lived nuclides whose hazard potential remains high for hundreds of thousands of years. Neutron induced transmutation offers a promising technique for the treatment of problem wastes. Transmutation is unique as a waste management scheme in that it offers the potential for "destruction" of the hazardous nuclides by conversion to non-hazardous or more manageable nuclides. The transmutation potential of a thermal spectrum uranium hexafluoride fueled cavity reactor was examined. Initial studies focused on a heavy water moderated cavity reactor fueled with 5% enriched U-235-F6 and operating with an average thermal flux of 6 times 10 to the 14th power neutrons/sq cm-sec. The isotopes considered for transmutation were I-129, Am-241, Am-242m, Am-243, Cm-243, Cm-244, Cm-245, and Cm-246.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Princeton Univ. Partially Ionized Plasmas, Including the 3rd Symp. on Uranium Plasmas; p 263-268
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  • 10
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    A single-board preprocessor and pulse generator (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Aeronomy Lab. of NOAA has designed and built a single board, programmable radar controller for use with VHF ST (stratosphere troposphere) radars. The controller consists of a coherent integrator preprocessor and a radar pulse generator, both of which are described, as well as interfaces to an antenna beam switch and a receiver bandwidth switch. The controller occupies a single slot in a Data General Nova of Eclipse computer. The integrator and pulse generator take advantage of high density, dual port FIFO chips such as the 512 x 9 Mostek MK 4501. These FIFOs have separate input and output ports and independent read and write cycles with cycle times of less than 200 ns, making them very fast and easy to interface. A simple block diagram of the coherent integrator is shown. The integrator is designed to handle inputs from one receiver (2 channels) with 1 sec sample spacing. The pulse generator is based on controllers designed by R. F. Woodman for the Arecibo and SOUSY radars us a recirculating memory scheme.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: International Council of Scientific Unions, Middle Atmosphere Program. Handbook for MAP, Vol. 20; 3 p
    Format: application/pdf
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