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  • 2000-2004  (4)
  • 1970-1974  (3)
  • 1
    Electronic Resource
    Electronic Resource
    WATER QUALITY MANAGEMENT: THE CASE FOR RIVER BASIN AUTHORITIES (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 9 (1973), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : There is a lamentable absence of comprehensive planning in the current cursade to improve water quality. A serious shortcoming is the lack of evaluation of the effects of waste water treatment upon environmental quality. At some point in time the public may ask what they have obtained for their money. The nature of pollution in a river basin demands a coordinated attack against it. Engineering and economic criteria suggest that a properly empowered river basin authority would be the logical organization to plan and operate a water quality management system. Several forms of such authorities have operated effectively and efficiently for many years in the United States and other industrialized countries. Examples of successful river basin authorities and their advantages and methods of operation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1973.tb05813.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    High power transcranial beam steering for ultrasonic brain therapy (2003)
    Institute of Physics
    Details
    Publication Date: 2003-07-30
    Print ISSN: 0031-9155
    Electronic ISSN: 1361-6560
    Topics: Biology , Medicine , Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 3
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    WATER QUALITY MANAGEMENT: THE CASE FOR RIVER BASIN AUTHORITIES (1973)
    Wiley
    Details
    Publication Date: 1973-10-01
    Print ISSN: 1093-474X
    Electronic ISSN: 1752-1688
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley
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    PAPER CURRENT
  • 4
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    Detection of microlesions induced by heavy ions using liposomes filled with fluorescent dye (2004)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: In cells irradiation by heavy ions has been hypothesized to produce microlesions, regions of local damage. In cell membranes this damage is thought to manifest itself in the form of holes. The primary evidence for microlesions comes from morphological studies of cell membranes, but this evidence is still controversial, especially since holes also have been observed in membranes of normal, nonirradiated, cells. However, it is possible that damage not associated with histologically discernable disruptions may still occur. In order to resolve this issue, we developed a system for detecting microlesions based on liposomes filled with fluorescent dye. We hypothesized that if microlesions form in these liposomes as the result of irradiation, then the entrapped dye will leak out into the surrounding medium in a measurable way. Polypropylene vials containing suspensions of vesicles composed of either dipalmitoyl phosphatidylcholine, or a combination of egg phosphatidylcholine and cholesterol were irradiated at the Brookhaven National Laboratory using 56Fe ions at 1 GeV/amu. In several cases we obtained a significant loss of the entrapped dye above the background level. Our results suggest that holes may form in liposomes as the result of heavy ion irradiation, and that these holes are large enough to allow leakage of cell internal contents that are at least as large as a 1 nm diameter calcein molecule. c2004 COSPAR. Published by Elsevier Ltd. All rights reserved.
    Keywords: Life Sciences (General)
    Type: Advances in space research : the official journal of the Committee on Space Research (COSPAR); Volume 34; 6; 1373-7
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Multigrid Relaxation of a Factorizable, Conservative Discretization of the Compressible Flow Equations (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The second-order factorizable discretization of the compressible Euler equations developed by Sidilkover is extended to conservation form on general curvilinear body-fitted grids. The discrete equations are solved by symmetric collective Gauss-Seidel relaxation and FAS multigrid. Solutions for flow in a channel with Mach numbers ranging from 0.0001 to a supercritical Mach number are shown, demonstrating uniform convergence rates and no loss of accuracy in the incompressible limit. A solution for the flow around the leading edge of a semi-infinite parabolic body demonstrates that the scheme maintains rapid convergence for a flow containing a stagnation point.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: AIAA Paper 2000-2252 , Fluids; Jun 19, 2000 - Jun 22, 2000; Denver, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Aerodynamic effects of five lift-fan pod arrangements on an unpowered V/STOL transport model (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An investigation was conducted in the Langley V/STOL tunnel to determine the effect of longitudinally oriented wing-mounted pods on the longitudinal and lateral aerodynamic characteristics in the cruise flight condition of a high-wing V/STOL transport model. Five pod arrangements were tested - three configurations with in-line pods at 20, 40, or 60 percent semispan and two split pod configurations with rear pods at 20 percent semispan and front pods at 40 or 60 percent semispan. In general, addition of the pods to the model decreased the stability, increased the lift-curve slope, and alleviated the abrupt stall of the basic model. The configuration with pods at 20 percent semispan had an abrupt instability at 10 deg angle of attack, All the configurations had lateral stability at sideslip angles from 5 to -5 deg. Very little difference in results existed between the configurations with pods at 40 and 60 percent semispan. Of the split pod configurations, the configuration with front pods at 40 percent semispan offered the best trimmed lift and lift-induced drag characteristics at high angles of attack. The configuration with in-line pods at 40 or 60 percent semispan provided the best cruise characteristics of all the pod configurations.
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-7199 , L-8754
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Turbulence Modeling Workshop (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Advances in turbulence modeling are needed in order to calculate high Reynolds number flows near the onset of separation and beyond. To this end, the participants in this workshop made the following recommendations. (1) A national/international database and standards for turbulence modeling assessment should be established. Existing experimental data sets should be reviewed and categorized. Advantage should be taken of other efforts already under-way, such as that of the European Research Community on Flow, Turbulence, and Combustion (ERCOFTAC) consortium. Carefully selected "unit" experiments will be needed, as well as advances in instrumentation, to fill the gaps in existing datasets. A high priority should be given to document existing turbulence model capabilities in a standard form, including numerical implementation issues such as grid quality and resolution. (2) NASA should support long-term research on Algebraic Stress Models and Reynolds Stress Models. The emphasis should be placed on improving the length-scale equation, since it is the least understood and is a key component of two-equation and higher models. Second priority should be given to the development of improved near-wall models. Direct Numerical Simulations (DNS) and Large Eddy Simulations (LES) would provide valuable guidance in developing and validating new Reynolds-averaged Navier-Stokes (RANS) models. Although not the focus of this workshop, DNS, LES, and hybrid methods currently represent viable approaches for analysis on a limited basis. Therefore, although computer limitations require the use of RANS methods for realistic configurations at high Reynolds number in the foreseeable future, a balanced effort in turbulence modeling development, validation, and implementation should include these approaches as well.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA/CR-2001-210841 , NAS 1.26:210841 , ICASE-IR-37 , Turbulence Modeling Workshop; Jan 12, 2001 - Jan 13, 2001; Reno, NV; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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