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  • Nuclear Reactions  (4)
  • Magnetism  (2)
  • Dredging  (1)
  • EMF  (1)
  • Engineering (General)  (1)
  • Fluid Mechanics and Thermodynamics  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A rationale for coastal wetland restoration through spoil bank management in Louisiana, USA (1994)
    Springer
    Environmental management 18 (1994), S. 271-282 
    Details
    ISSN: 1432-1009
    Keywords: Wetland ; Restoration ; Dredging ; Spoil ; Louisiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The rationale and outline of an implementation plan for restoring coastal wetlands in Louisiana is presented. The rationale for the plan is based on reversing the consequences of documented cause-and-effect relationships between wetland loss and hydrologic change. The main feature is to modify the extensive interlocking network of dredged spoil deposits, or spoil banks, by reestablishing a more natural water flow at moderate flow velocity (〈5 cm/sec). Guidelines for site selection from thousands of potential sites are proposed. Examples of suitable sites are given for intermediate marshes. These sites exhibit rapid deterioration following partial or complete hydrologic impoundment, implying a strong hydrologic, rather than sedimentological, cause of wetland deterioration. We used an exploratory hydrologic model to guide determination of the amount of spoil bank to be removed. The results from an economic model indicated a very effective cost-benefit ratio. Both models and practical experience with other types of restoration plans, in Louisiana and elsewhere, exhibit an economy of scale, wherein larger projects are more cost effective than smaller projects. However, in contrast to these other projects, spoil bank management may be 100 to 1000 times more cost effective and useful in wetland tracts 〈1000 ha in size. Modest spoil bank management at numerous small wetland sites appears to offer substantial positive attributes compared to alternative and more intensive management at a few larger wetland sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02393768
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Melatonin and puberty in female lambs exposed to EMF: A replicate study (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 16 (1995), S. 119-123 
    Details
    ISSN: 0197-8462
    Keywords: EMF ; melatonin ; puberty ; sheep ; transmission line ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: In an earlier study, we found no effects of 60 Hz electric and magnetic fields (EMF) from a 500 kV transmission line on serum melatonin patterns or on puberty in ten female Suffolk lambs (Ovis aries). We conducted a larger replicate study of 15 lambs exposed to a mean electric field of 6.3 kV/m and a mean magnetic field of 3.77 μT and 15 controls exposed to EMF two orders of magnitude weaker than in the line area. The replicate produced essentially the same results as our previous study. © 1995 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bem.2250160208
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  • 3
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    Precision measurement of the ^{238}Pu(n,γ) cross section (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-10-15
    Description: Author(s): A. Chyzh, C. Y. Wu, E. Kwan, R. A. Henderson, J. M. Gostic, T. A. Bredeweg, A. Couture, R. C. Haight, H. Y. Lee, J. M. O’Donnell, and J. L. Ullmann The neutron-capture cross section for 238 Pu was measured by using the detector for advanced neutron-capture experiments (DANCE) array, which is a highly segmented and highly efficient 4 π γ -ray calorimeter. The neutron-capture events were recognized by the total γ -ray energy deposited in DANCE, which... [Phys. Rev. C 88, 044607] Published Mon Oct 14, 2013
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Total prompt γ-ray emission in fission of U235, Pu239,241, and Cf252 (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-07-12
    Description: Author(s): A. Chyzh, C. Y. Wu, E. Kwan, R. A. Henderson, T. A. Bredeweg, R. C. Haight, A. C. Hayes-Sterbenz, H. Y. Lee, J. M. O'Donnell, and J. L. Ullmann The total prompt γ-ray energy distributions for the neutron-induced fission of U235 and Pu239,241 in the neutron energy range of 0.025 eV – 100 keV and the spontaneous fission of Cf252 were measured using the Detector for Advanced Neutron Capture Experiments (DANCE) in coincidence with the detection... [Phys. Rev. C 90, 014602] Published Fri Jul 11, 2014
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Prompt γ-ray production in neutron-induced fission of ^{239}Pu (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-04-12
    Description: Author(s): J. L. Ullmann, E. M. Bond, T. A. Bredeweg, A. Couture, R. C. Haight, M. Jandel, T. Kawano, H. Y. Lee, J. M. O’Donnell, A. C. Hayes, I. Stetcu, T. N. Taddeucci, P. Talou, D. J. Vieira, J. B. Wilhelmy, J. A. Becker, A. Chyzh, J. Gostic, R. Henderson, E. Kwan, and C. Y. Wu Background: The prompt gamma-ray spectrum from fission is important for understanding the physics of nuclear fission, and also in applications involving fission. Relatively few measurements of the prompt gamma spectrum from 239 Pu( n , f ) have been published. Purpose: This experiment measured the multipl... [Phys. Rev. C 87, 044607] Published Thu Apr 11, 2013
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Magnetic order tuned by Cu substitution in Fe_{1.1−z}Cu_{z}Te (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-07-03
    Description: Author(s): Jinsheng Wen, Zhijun Xu, Guangyong Xu, M. D. Lumsden, P. N. Valdivia, E. Bourret-Courchesne, Genda Gu, Dung-Hai Lee, J. M. Tranquada, and R. J. Birgeneau We study the effects of Cu substitution in Fe 1.1 Te, the nonsuperconducting parent compound of the iron-based superconductor, Fe 1+ y Te 1− x Se x , utilizing neutron scattering techniques. It is found that the structural and magnetic transitions, which occur at ∼ 60 K without Cu, are monotonically depressed ... [Phys. Rev. B 86, 024401] Published Mon Jul 02, 2012
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Systematics of prompt γ-ray emission in fission (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-03-23
    Description: Author(s): A. Chyzh, C. Y. Wu, E. Kwan, R. A. Henderson, J. M. Gostic, T. A. Bredeweg, A. Couture, R. C. Haight, A. C. Hayes-Sterbenz, M. Jandel, H. Y. Lee, J. M. O’Donnell, and J. L. Ullmann The prompt γ -ray energy and multiplicity distributions were measured for the neutron-induced fission in 235 U and 239,241 Pu by using a highly segmented 4 π   γ -ray calorimeter in coincidence with the detection of fission fragments by a gas-filled parallel-plate avalanche counter. Both distributions were... [Phys. Rev. C 87, 034620] Published Fri Mar 22, 2013
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Antiferromagnetism with divalent Eu in EuNi_{5} As_{3} (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-01-18
    Description: Author(s): W. B. Jiang, M. Smidman, W. Xie, J. Y. Liu, J. M. Lee, J. M. Chen, S. C. Ho, H. Ishii, K. D. Tsuei, C. Y. Guo, Y. J. Zhang, Hanoh Lee, and H. Q. Yuan We have successfully synthesized single crystals of EuNi 5 As 3 using a flux method, and we present a comprehensive study of the physical properties using magnetic susceptibility, specific heat, electrical resistivity, thermoelectric power, and x-ray absorption spectroscopy (XAS) measurements. EuNi 5 As 3 … [Phys. Rev. B 95, 024416] Published Tue Jan 17, 2017
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Modeling Orifice Pulse Tube Coolers (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: We have developed a calculational model that treats all the components of an orifice pulse tube cooler. We base our analysis on 1-dimensional thermodynamic equations for the regenerator and we assume that all mass flows, pressure oscillations and temperature oscillations are small and sinusoidal. Non-linear pressure drop effects are included in the regenerator to account for finite pressure amplitude effects. The resulting mass flows and pressures are matched at the boundaries with the other components of the cooler: compressor, aftercooler, cold heat exchanger, pulse tube, hot heat exchanger, orifice and reservoir. The results of the calculation are oscillating pressures, mass flows and enthalpy flows in the main components of the cooler. By comparing with the calculations of other available models, we show that our model is very similar to REGEN 3 from NIST and DeltaE from Los Alamos National Lab. Our model is much easier to use than other available models because of its simple graphical interface and the fact that no guesses are required for the operating pressures or mass flows. In addition, the model only requires a few minutes of running time allowing many parameters to be optimized in a reasonable time. A version of the model is available for use over the World Wide Web at http://irtek.arc.nasa.gov. Future enhancements include adding a bypass orifice and including second order terms in steady mass streaming and steady heat transfer. A two-dimensional anelastic approximation of the fluid equations will be used as the basis for the latter analysis. Preliminary results are given in dimensionless numbers appropriate for oscillating compressible flows. The model shows how transverse heat transfer reduces enthalpy flow, particularly for small pulse tubes. The model also clearly shows mass recirculation in the open tube on the order of the tube length. They result from the higher order Reynolds stresses. An interesting result of the linearized approach is that the steady mass streaming does not affect the enthalpy flow at second order. The major effect of recirculating mass streaming is to increase transverse temperature gradients, which leads to higher entropy production and reduced efficiency.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: WE-Heraeus Seminar on Low Power Cryocoolers; Jun 13, 1996 - Jun 15, 1996; Bad Honnef; Germany
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Steady Secondary Momentum and Enthalpy Streaming in the Pulse Tube Refrigerator (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Our study investigates the steady secondary streaming that occurs in the pulse tube refrigerator through application of the conservation laws and support by flow visualization experiments. A series expansion of the mass, momentum and energy conservation laws for an axisymmetric system yields a set of linear differential equations. The series solution is expanded in the small parameter epsilon = 1/Str where Str is the Strouhal number. The O(1) basic flow problem is solved for the case of a compressible ideal gas oscillating within a cylindrical tube. The phase and amplitude of the boundary conditions on axial velocity are treated as independent parameters. The basic solution for the gas domain is solved for the case of temperature and heat flux coupling to the tube wall. The temperature coupled solution shows how the Fourier number of the tube wall affects the gas temperature, phase angle, and time-averaged enthalpy flow. The basic solution is also examined for the time-averaged Reynolds stresses which are shown to be the driving force that produces steady secondary momentum streaming. Calculated solutions to the steady momentum streaming are shown to be in qualitative agreement with flow visualization experiments.
    Keywords: Engineering (General)
    Type: International Cryocooler Conference; Jun 28, 1994 - Jun 30, 1994; Vail, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
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