Solar and Space Physics: A Science for a Technological Society. An Overview. PB2015100255

In 2010, NASA and the National Science Foundation asked the National Research Council to assemble a committee of experts (the decadal survey committee) to develop an integrated national strategy that would guide agency investments in solar and space physics (or heliophysics in the terminology used by NASA) for the years 2013-2022. That strategy, the result of nearly 2 years of effort by the survey committee, which worked with more than 100 scientists and engineers on eight supporting study panels, is presented in the 2013 publication, Solar and Space Physics: A Science for a Technological Society. This booklet, designed to be accessible to a broader audience of policymakers and the interested public, summarizes the content of that report but does not replace, nor should it be construed, as a substitute for the findings and recommendations of the actual report. For more info contact NTIS 800-553-6847 Mon – Fri 8am -5pm est
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Ebola: Basics About the Disease, October 3, 2014.

imagesCAVLR0BBIn March 2014, global health officials recognized an outbreak of Ebola virus disease (EVD) in Guinea, West Africa. In retrospect, officials determined that the outbreak began in December 2013, and spread to the adjacent countries of Liberia and Sierra Leone. In September 2014, the U.S. Centers for Disease Control and Prevention (CDC) confirmed the first EVD case diagnosed in the United States, heightening concerns among some who fear the disease could spread in American communities. This report discusses EVD in general, including symptoms, modes of transmission, incubation period, and treatments; presents projections of the future course of the outbreak; and lists additional CRS products, including products focused on the situation in West Africa. Unless otherwise cited, information in this report is drawn from Ebola information pages of CDC and the World Health Organization (WHO). Personal Author:
Lister, S. A. For more info please
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Ebola: Basics About the Disease, October 3, 2014.

imagesCA4CU58BIn March 2014, global health officials recognized an outbreak of Ebola virus disease (EVD) in Guinea, West Africa. In retrospect, officials determined that the outbreak began in December 2013, and spread to the adjacent countries of Liberia and Sierra Leone. In September 2014, the U.S. Centers for Disease Control and Prevention (CDC) confirmed the first EVD case diagnosed in the United States, heightening concerns among some who fear the disease could spread in American communities. This report discusses EVD in general, including symptoms, modes of transmission, incubation period, and treatments; presents projections of the future course of the outbreak; and lists additional CRS products, including products focused on the situation in West Africa. Unless otherwise cited, information in this report is drawn from Ebola information pages of CDC and the World Health Organization (WHO).
Author: Lister, S. A.
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Design Issues for Using Magnetic Materials in Radiation Environments at Elevated Temperature.

images[7]One of the challenges of designing motors and alternators for use in nuclear powered space missions is accounting for the effects of radiation. Terrestrial reactor power plants use distance and shielding to minimize radiation damage but space missions must economize volume and mass. Past studies have shown that sufficiently high radiation levels can affect the magnetic response of hard and soft magnetic materials. Theoretical models explaining the radiation-induced degradation have been proposed but not verified. This paper reviews the literature and explains the cumulative effects of temperature, magnetic-load, and radiation-level on the magnetic properties of component materials. Magnetic property degradation is very specific to alloy choice and processing history, since magnetic properties are very much entwined with specific chemistry and microstructural features. However, there is basic theoretical as well as supportive experimental evidence that the negative impact to magnetic properties will be minimal if the bulk temperature of the material is less than fifty percent of the Curie temperature, the radiation flux is low, and the demagnetization field is small.
Personal Author: C. L. Bow
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Sediment-Hosted Gold Deposits of the World-Database and Grade and Tonnage Models.

Image9All sediment-hosted gold deposits (as a single population) share one characteristicthey all have disseminated micron-sized invisible gold in sedimentary rocks. Sediment-hosted gold deposits are recognized in the Great Basin province of the western United States and in China along with a few recognized deposits in Indonesia, Iran, and Malaysia. Three new grade and tonnage models for sediment-hosted gold deposits are presented in this paper: (1) a general sediment-hosted gold type model, (2) a Carlin subtype model, and (3) a Chinese subtype model. These models are based on grade and tonnage data from a database compilation of 118 sediment-hosted gold deposits including a total of 123 global deposits.
Personal Author Berger, V. I.; Mosier, D. L.; Bliss, J. D.; Moring, B. C.
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Pulse Jet Mixing Tests with Noncohesive Solids.

OSTIexterior_0This report summarizes results from pulse jet mixing (PJM) tests with noncohesive solids in Newtonian liquid. The tests were conducted during FY 2007 and 2008 to support the design of mixing systems for the Hanford Waste Treatment and Immobilization Plant (WTP). Tests were conducted at three geometric scales using noncohesive simulants, and the test data were used to develop models predicting two measures of mixing performance for full-scale WTP vessels. The models predict the cloud height (the height to which solids will be lifted by the PJM action) and the critical suspension velocity (the minimum velocity needed to ensure all solids are suspended off the floor, though not fully mixed). From the cloud height, the concentration of solids at the pump inlet can be estimated. The predicted critical suspension velocity for lifting all solids is not precisely the same as the mixing requirement for disturbing a sufficient volume of solids, but the values will be similar and closely related. These predictive models were successfully benchmarked against larger scale tests and compared well with results from computational fluid dynamics simulations. The application of the models to assess mixing in WTP vessels is illustrated in examples for 13 distinct designs and selected operational conditions. The values selected for these examples are not final; thus the estimates of performance should not be interpreted as final conclusions of design adequacy or inadequacy. However, this work does reveal that several vessels may require adjustments to design, operating features, or waste feed properties to ensure confidence in operation. The models described in this report will prove to be valuable engineering tools to evaluate options as designs are finalized for the WTP.
Personal Author Meyer, P. A.; Enderlin, C. W.; Wells, B. E.; Scott, P. A.; Smith, G. L.
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Comment on ‘Mode Conversion of Waves in the Ion-Cyclotron Frequency Range in Magnetospheric Plasmas

imagesCAXAYMHCRecently, Kazakov and FOulOop (1) studied mode conversion (MC) at the ion-ion hybrid (IIH) resonance in planetary magnetospheric plasmas by simplifying the dispersion relation of the fast wave (FW) modes to describe a cutoff-resonance (CR) pair near the IIH resonance, which can be reduced to a Budden problem. They suggested that when the IIH resonance frequency (omegas) approaches the crossover frequency (omega cr), and the parallel wavenumber (k bar bar) is close to the critical wavenumber (k star bar bar)(omega s= omega cr), MC can be efficient for arbitrary heavy ion density ratios.
Author: E. H. Kim J. R. Johnson
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Human Paraoxonase Double Mutants Hydrolyze V and G Class Organophosphorus Nerve Agents.

Variants of human paraoxonase 1 (PON1) are being developed as catalytic bioscavengers for the organophosphorus chemical warfare agents (OP). It is preferable that the new PON1 variants have broad spectrum hydrolase activities to hydrolyze both G- and V-class OPs. H115W PON1 has shown improvements over wild type PON1 in its capacity to hydrolyze some OP compounds. We improved upon these activities either by substituting a tryptophan (F347W) near the putative active site residues for enhanced substrate binding or by reducing a bulky group (Y71A) at the periphery of the putative enzyme active site. When compared to H115W alone, we found that H115W/Y71A and H115W/F347W maintained VX catalytic efficiency but showed mixed results for the capacity to hydrolyze paraoxon. Testing our double mutants against racemic sarin, we observed reduced values of KM for H115W/F347W that modestly improved catalytic efficiency over wild type and H115W. Contrary to previous reports, we show that H115W can hydrolyze soman, and the double mutant H115W/Y71A is nearly 4-fold more efficient than H115W for paraoxon hydrolysis. We also observed modest stereoselectivity for hydrolysis of the P(-) stereoisomer of tabun by H115W/F347W. These data demonstrate enhancements made in PON1 for the purpose of developing an improved catalytic bioscavenger to protect cholinesterase against chemical warfare agents.Personal Author B. J. Bahnson D. M. Cerasoli J. R. Norris J. R. Smith S. D. Kirby
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Investigations of Fluid-Structure-Coupling and Turbulence Model Effects on the DLR Results of the Fifth AIAA CFD Drag Prediction Workshop

images[7]The accurate calculation of aerodynamic forces and moments is of significant importance during the design phase of an aircraft. Reynolds-averaged Navier-Stokes (RANS) based Computational Fluid Dynamics (CFD) has been strongly developed over the last two decades regarding robustness, efficiency, and capabilities for aerodynamically complex configurations. Incremental aerodynamic coefficients of different designs can be calculated with an acceptable reliability at the cruise design point of transonic aircraft for non-separated flows. But regarding absolute values as well as increments at off-design significant challenges still exist to compute aerodynamic data and the underlying flow physics with the accuracy required. In addition to drag, pitching moments are difficult to predict because small deviations of the pressure distributions, e.g. due to neglecting wing bending and twisting caused by the aerodynamic loads can result in large discrepancies compared to experimental data. Flow separations that start to develop at off-design conditions, e.g. in corner-flows, at trailing edges, or shock induced, can have a strong impact on the predictions of aerodynamic coefficients too. Based on these challenges faced by the CFD community a working group of the AIAA Applied Aerodynamics Technical Committee initiated in 2001 the CFD Drag Prediction Workshop (DPW) series resulting in five international workshops. The results of the participants and the committee are summarized in more than 120 papers. The latest, fifth workshop took place in June 2012 in conjunction with the 30th AIAA Applied Aerodynamics Conference. The results in this paper will evaluate the influence of static aeroelastic wing deformations onto pressure distributions and overall aerodynamic coefficients based on the NASA finite element structural model and the common grids. Personal Author B. Eisfeld M. B. Rivers O. P. Brodersen S. Keye V. Togiti
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Managing Critical Isotopes: Stewardship of Lithium-7 Is Needed to Ensure a Stable Supply

images[4]About 13 percent of our nation’s electricity is produced by pressurized water reactors that rely on lithium-7, an isotope of lithium produced and exported solely by China and Russia, for their safe operation. Lithium-7 is added to the water that cools the reactor core to prevent the cooling water from becoming acidic. Without the lithium-7, the cooling waters acidity would increase the rate of corrosion of pipes and other infrastructure possibly causing them to fail. Utilities that operate the pressurized water reactors have experienced little difficulty obtaining lithium-7, but they may not be aware of all the risks of relying on two producers. GAO was asked to review the supply and domestic demand for lithium-7 and how risks are being managed. This report examines (1) what is known about the supply and demand of lithium-7, (2) what federal agencies are responsible for managing supply risks, and (3) alternative options to mitigate a potential shortage. GAO reviewed documents and interviewed officials from DOE, NNSA, and NRC, in addition to industry representatives. This report is an unclassified version of a classified report also issued in September 2013. For more info please go
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