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U.S. Agent Orange/Dioxin Assistance to Vietnam

Description: This report discusses U.S. assistance to Vietnam for the environmental and health damage attributed to a dioxin contained in Agent Orange and other herbicides sprayed over much of the southern portion of the country during the Vietnam War, which remains a major issue in bilateral relations.
Date: November 9, 2018
Creator: Martin, Michael F.
Partner: UNT Libraries Government Documents Department

Experimental investigations of strong interactions in non-perturbative QCD region. Annual progress report, January 16, 1992--January 15, 1993

Description: We have experimentally investigated the reactions {pi} {sup {minus}}p {yields} {phi}{phi}n (OZI forbidden), {phi}K{sup +}K{sup {minus}}n (OZI allowed), K{sup {minus}}p {yields}{phi}{phi}{l_brace}{sub {sigma}}{sup {lambda}}{r_brace} (OZI allowed),{phi}K{sup +}K{sup {minus}}{l_brace}{sub {sigma}}{sup {lambda}}{r_brace}(OZI allowed),{bar p}p {yields} {phi} {phi} {pi} {sup 0} (OZI forbidden), {phi}K{sup +}K{sup {minus}}{pi}{sup 0} (OZI allowed). By comparing the OZI forbidden (glueball filter) reactions with the OZI allowed and taking a global view we hope to critically test our hypothesis that the g{sub T} (2010), g{sub T{prime}} (2300), and g{sub T}{double_prime}(2340) all with I{sup G}J{sup PC} = 0{sup +}2{sup ++} are produced by 1--3 2{sup ++} glueballs. We have searched for a Quark-Gluon Plasma by using 14.6 GeV/c {times} A Si ions incident on Au, Cu and Si. The novel detector used was a large solid angle TPC system. Although we found considerable strangeness enhancement this is explainable by conventional cascade physics including N* production. We have been engaged in phenomenological analyses in both glueball and heavy ion work. We have found that the {theta}(1720) is the same as the 0{sup ++} f{sub 0}(1720) we discovered earlier. Furthermore that the G(1590) can be explained as a sum of the f{sub 0}(1400) and f{sub 0}(1720) and does not require a new resonant state. We have also found that the strangeness enhancement discovered in heavy ion collisions so far is explainable by conventional physics. We are in the STAR Collaboration at RHIC which uses a large TPC system to search for a Quark-Gluon Plasma.
Date: September 9, 1992
Creator: Lindenbaum, S. J. & Samuel, S.
Partner: UNT Libraries Government Documents Department

Solar collector manufacturing activity, 1992

Description: This report presents data provided by US-based manufacturers and importers of solar collectors. Summary data on solar thermal collector shipments are presented for the years 1974 through 1992. Summary data on photovoltaic cell and module shipments are presented for the years 1982 through 1992. Detailed information for solar thermal collectors and photovoltaic cells and modules are presented for 1992. Appendix A describes the survey methodology. Appendix B contains the 1992 survey forms and instructions. Appendices C and D list the companies that responded to the 1992 surveys and granted permission for their names and addresses to appear in the report. Appendix E provides selected tables from this report with data shown in the International System of Units (SI) metric units. Appendix F provides an estimate of installed capacity and energy production from solar collectors for 1992.
Date: November 9, 1993
Partner: UNT Libraries Government Documents Department

Spectral Astrometry Mission for Planets Detection

Description: The Spectral Astrometry Mission is a space-mission concept that uses simultaneous, multiple-star differential astrometry to measure exo-solar planet masses. The goal of SAM is to measure the reflex motions of hundreds of nearby ({approx}50 pc) F, G and K stars, relative to adjacent stars, with a resolution of 2.5 {micro}-arcsec. SAM is a new application of Spectral Interferometry (SI), also called Externally Dispersed Interferometry (EDI), that can simultaneously measure the angular difference between the target and multiple reference stars. SI has demonstrated the ability to measure a {lambda}/20,000 white-light fringe shift with only {lambda}/3 baseline control. SAM's structural stability and compensation requirements are therefore dramatically reduced compared to existing long-arm balanced-arm interferometric astrometry methods. We describe the SAM's mission concept, long-baseline SI astrometry method, and technical challenges to achieving the mission.
Date: August 9, 2002
Creator: Erskine, D J & Edelstein, J
Partner: UNT Libraries Government Documents Department

Mixing in a river

Description: Many rivers are burdened with tributary streams of warm water and/or liquid wastes containing dissolved or suspended matter. The warm water and waste matter mix thoroughly with the river water some distance downstream from the point of entry of the tributary, but near the point of entry there may be high local temperatures or concentrations of waste. It is often necessary to know the local temperatures or concentrations of waste. The authors have used a formula for computing the turbulent mixing that takes place in such a situation; this formula fits quite well in the case of one Southern river.
Date: May 9, 1956
Creator: Bernath, L.; Menegus, R. L. & Ring, H. F.
Partner: UNT Libraries Government Documents Department

Handwriting Examination: Moving from Art to Science

Description: The scientific basis for handwriting individuality and the expertise of handwriting examiners has been questioned in several court cases and law review articles. The criticisms were originally directed at the proficiency and expertise of forensic document examiners (FDE's). However, these criticisms also illustrate the lack of empirical data to support and validate the premises and methodology of handwriting examination. As a result the admissibility and weight of FDE testimony has been called into question. These assaults on the scientific integrity of handwriting analysis have created an urgent need for the forensic document examination community to develop objective standards, measurable criteria and a uniform methodology supported by properly controlled studies that evaluate and validate the significance of measurable handwriting characteristics.
Date: April 9, 1999
Creator: Jarman, Kristin H.; Hanlen, Richard C. & Manzolillo, P. A.
Partner: UNT Libraries Government Documents Department

Joule heating of the ITER TF cold structure: Effects of vertical control coil currents and ELMS

Description: The toroidal field coil and support structures for ITER are maintained at cryogenic temperatures. The time-varying currents in the poloidal field coil system will induce eddy currents in these structures. The associated Joule dissipation will cause local heating and require heat removal which will show up as a load on the cryogenic system. Studies of Joule heating of the ITER TF cold structure (TFCS) due to the currents in the poloidal field coil system are presented. The two regimes considered in this study are the plasma vertical stability control and the Edge Loss Mode (ELM) events. The 3-D, thin-shell, eddy current program, EDDYCUFF was used to analyze the eddy currents and Joule losses in the cold structure. The current versus time scenarios were defined. Four control coil options were studied. All schemes use coils external to the TF cold structure. Analyses of power depositions during the plasma vertical stability control were performed for each of the four options. For each of these options three different recovery times were assumed. The times were 3, 1, and 1/3 seconds. Sets of four sequential ELMs, as well as isolated ELMs have been studied for various sets of active PF coils. The results showed that the lowest average power dissipation in the TF cold structure occurs when a subset of PF2 and PF7 are active, and all the other PF coils are passive. The general conclusion is that to minimize power dissipation in the TF cold structure it is preferable that only coils PF2 and PF7 are active. The other coils (PF3-PF6) should be passive and driven by a condition of constant flux. It is recommended in particular, that coils PF3 and PF5 be allowed to change currents to conserve flux, since they provide the maximum shielding of the TFCS from the fields caused ...
Date: November 9, 1993
Creator: Radovinsky, A. & Pillsbury, R. D. Jr.
Partner: UNT Libraries Government Documents Department

The Path to Fusion Energy for Concepts Currently at the Concept Exploration Level

Description: Concept Exploration (CE) experiments within the Innovative Confinement Concept Program have a unique role which impacts their contributions to the development of fusion energy. As stated in the FESAC ''Report on Alternate Concepts:'' These [CE] programs are aimed at innovation and basic understanding of relevant scientific phenomena. The emphasis on innovation motivates their application to the search for a better fusion reactor configuration. In addition, because of their unique character the CE experiments offer excellent opportunities to couple fusion-plasma physics to other sciences. A recent example of coupling is the fusion self-organized plasmas to reconnection physics and extra-terrestrial plasmas. Perhaps of even greater importance is the education of the future scientists needed for developing fusion energy. The CE experiments, both at universities and national labs, are of a size students can ''get their hands around;'' young scientists and engineers will be attracted by this intellectual challenge combined with the vision of low-pollution energy for mankind represented by a burning-plasma experiment. A CE concept showing promise for fusion energy is expected to advance to the Proof-of-Principal stage. Experience has shown that this progression may occur in several ways: NSTX followed from success in START, a CE-level experiment in England; NCSX built on a broad base of theory and a strong international stellarator data base, without a CE experiment to test quasi-axisymmetry; and MST is following an upgrade path from the CE experiment of the same name. The lesson to be learned is a highly positive one, namely that the portfolio approach--with its five stages of development--is being applied in a flexible and pragmatic manner without artificial constraints from strategic planning. This lesson also makes it clear that as we move towards the development of fusion energy we need to determine the best way forward for each promising configuration, taking advantage of ...
Date: January 9, 2003
Creator: Hooper, E B
Partner: UNT Libraries Government Documents Department

High-Resolution Broadband Spectral Interferometry

Description: We demonstrate solar spectra from a novel interferometric method for compact broadband high-resolution spectroscopy. The spectral interferometer (SI) is a hybrid instrument that uses a spectrometer to externally disperse the output of a fixed-delay interferometer. It also has been called an externally dispersed interferometer (EDI). The interferometer can be used with linear spectrometers for imaging spectroscopy or with echelle spectrometers for very broad-band coverage. EDI's heterodyning technique enhances the spectrometer's response to high spectral-density features, increasing the effective resolution by factors of several while retaining its bandwidth. The method is extremely robust to instrumental insults such as focal spot size or displacement. The EDI uses no moving parts, such as purely interferometric FTS spectrometers, and can cover a much wider simultaneous bandpass than other internally dispersed interferometers (e.g. HHS or SHS).
Date: August 9, 2002
Creator: Erskine, D J & Edelstein, J
Partner: UNT Libraries Government Documents Department

How to Relate Complex DNA Repair Genotypes to Pathway Function and, Ultimately, Health Risk

Description: Exposure to ionizing radiation increases the incidence of cancer. However, predicting which individuals are at most risk from radiation exposure is a distant goal. Predictive ability is needed to guide policies that regulate radiation exposure and ensure that medical treatments have maximum benefit and minimum risk. Differences between people in susceptibility to radiation are largely based on their genotype, the genes inherited from their parents. Among the important genes are those that produce proteins that repair DNA damaged by radiation. Base Excision Repair (BER) proteins repair single strand breaks and oxidized bases in DNA. Double Strand Break Repair proteins repair broken chromosomes. Using technologies and information from the Human Genome Project, we have previously determined that the DNA sequence of DNA repair genes varies within the human population. An average of 3-4 different variants were found that affect the protein for each of 37 genes studied. The average frequency of these variants is 5%. Given the many genes in each DNA repair pathway and their many variants, technical ability to determine an individual's repair genotype greatly exceeds ability to interpret the information. A long-term goal is to relate DNA repair genotypes to health risk from radiation. This study focused on the BER pathway. The BER genes are known, variants of the genes have been identified at LLNL, and LLNL had recently developed an assay for BER function using white blood cells. The goal of this initial effort was to begin developing data that could be used to test the hypothesis that many different genotypes have similar DNA repair capacity phenotypes (function). Relationships between genotype and phenotype could then be used to group genotypes with similar function and ultimately test the association of groups of genotypes with health risk from radiation. Genotypes with reduced repair function are expected to increase risk ...
Date: January 9, 2002
Creator: Jones, IM
Partner: UNT Libraries Government Documents Department

Investigation on Soft X-Ray Lasers with a Picosecond-Laser-Irradiated Gas Puff Target

Description: We present results of experimental studies on transient gain soft x-ray lasers with a picosecond-laser-irradiated gas puff target. The target in a form of an elongated gas sheet is formed by pulsed injection of gas through a slit nozzle using a high-pressure electromagnetic valve developed and characterized at the Institute of Optoelectronics. The x-ray laser experiments were performed at the Lawrence Livermore National Laboratory using the tabletop Compact Multipulse Terawatt (COMET) laser to irradiate argon, krypton or xenon gas puff targets. Soft x-ray lasing in neon-like argon on the 3p-3s transition at 46.9 nm and the 3d-3p transition at 45.1 nm have been demonstrated, however, no amplification for nickel-like krypton or xenon was observed. Results of the experiments are presented and discussed.
Date: October 9, 2002
Creator: Fiedorowiez, H; Bartnik, A; Jarocki, R; Rakowski, R; Dunn, J; Smith, R F et al.
Partner: UNT Libraries Government Documents Department

Development of biological coal gasification (MicGAS process). Eleventh quarterly report, [January 1, 1993--March 31, 1993]

Description: During this reporting period comparison was made between theoretical and actual biogas production in the upflow reactors, where Texas lignite (TxL) was loaded at 0% (control) and 10% solids loadings. Data for methane and total gas production from task 4 were used. Calculations were made on the assumption that Texas lignite contains 60% carbon and theoretically all of this carbon is converted to CH{sub 4} and CO{sub 2}. Analysis of the data obtained from the bioreactor experiments showed that higher biogas production is due to more efficient biogasification of Texas lignite in bioreactor with reethanol (Table 1) . As it was previously mentioned, methanol (at 0.5% concentration of the total volume of reactants) can be used as hydrogen donor for biogasification (data presented in the 10th Quarterly report). Data in Table 1 clearly indicates, that the theoretical CH{sub 4} and biogas production from methanol is negligible and net biomethanation of TxL is enhanced by the addition of methanol. Observation of high methane production in the reactor where Texas lignite was supplemented with methanol, supports our hypothesis that methanol acts as an additional hydrogen donor.
Date: June 9, 1993
Partner: UNT Libraries Government Documents Department