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121
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50
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48
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42
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621 Matching Results
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Advanced Aerodynamic Devices to Improve the Performance, Economics, Handling, and Safety of Heavy Vehicles
Research is being conducted at the Georgia Tech Research Institute (GTRI) to develop advanced aerodynamic devices to improve the performance, economics, stability, handling and safety of operation of Heavy Vehicles by using previously-developed and flight-tested pneumatic (blown) aircraft technology. Recent wind-tunnel investigations of a generic Heavy Vehicle model with blowing slots on both the leading and trailing edges of the trailer have been conducted under contract to the DOE Office of Heavy Vehicle Technologies. These experimental results show overall aerodynamic drag reductions on the Pneumatic Heavy Vehicle of 50% using only 1 psig blowing pressure in the plenums, and over 80% drag reductions if additional blowing air were available. Additionally, an increase in drag force for braking was confirmed by blowing different slots. Lift coefficient was increased for rolling resistance reduction by blowing only the top slot, while downforce was produced for traction increase by blowing only the bottom. Also, side force and yawing moment were generated on either side of the vehicle, and directional stability was restored by blowing the appropriate side slot. These experimental results and the predicted full-scale payoffs are presented in this paper, as is a discussion of additional applications to conventional commercial autos, buses, motor …
Date:
May 14, 2001
Creator:
Englar, Robert J.
Object Type:
Article
System:
The UNT Digital Library
Aerial Radiometric and Magnetic Survey: Dillon National Topographic Map, Idaho and Montana, Volume 1
This report is the first volume of a two-part set documenting the results of the analyses of the airborne gamma radiation and total magnetic field survey that was flown for the Dillon National Topographic Map NL12-7.
Date:
May 14, 1979
Creator:
Geodata International, Inc.
Object Type:
Report
System:
The UNT Digital Library
Aging effects of US space nuclear systems in orbit
This report presents information and data in support of a cost-benefit analysis being performed by Fair child Industries (FI) on the feasibility of retrieving existing US space nuclear systems in earth orbit by the Space Shuttle. This report evaluates, for US space nuclear systems presently in orbit, the radioisotopic inventory and external radiation field as a function of time, the effect of aging on fuel containment materials over the projected lifetime of the system, and the possible radioactive source terms should reentry eventually occur. Although the radioisotopic inventories and radiation fields have been evaluated for all systems, Transit 4A and Transit Triad have been emphasized in the evaluation of the aging effects and reentry consequences because these spacecraft have the shortest projected orbital lifetimes (570 and 150 years, respectively). In addition to existing systems in orbit, the radioisotopic inventory, radiation field, and reentry source terms have been evaluated for a General Purpose Heat Source (GPHS) in a parking orbit due to an aborted Galileo Mission or International Solar Polar Mission (ISPM).
Date:
May 14, 1982
Creator:
Bartram, B. W.; Huang, R.; Tammara, S. R. & Thielke, N. R.
Object Type:
Report
System:
The UNT Digital Library
Agricultural Research: USDA's Outreach to Minority-Serving Institutions Could Improve Grant Competition
A letter report issued by the General Accounting Office with an abstract that begins "The U.S. Department of Agriculture (USDA) awards more than $200 million annually to universities and colleges to support its research, education, and extension missions. USDA's largest grant program is the National Research Initiative (NRI). GAO was asked to examine the (1) success of minority-serving institutions in competing for NRI research grants, (2) factors that could improve their success in competing for these grants, and (3) actions USDA has taken to improve the quantity and quality of grant proposals these institutions submit. GAO interviewed senior administrators at 43 minority-serving institutions that had either applied for an NRI grant between fiscal years 1997 and 2001 or received more than $100,000 from USDA for research, three major land grant universities, and cognizant USDA officials."
Date:
May 14, 2003
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
AGS Modifications for High Transition Energy
This report addresses the AGS modifications for high transition energy
Date:
May 14, 1996
Creator:
D., Courant E. & Trbojevic, D.
Object Type:
Report
System:
The UNT Digital Library
AIDS in Africa
Sub-Saharan Africa has been far more severely affected by AIDS than any other part of the world. The United Nations reports that 25.3 million adults and children are infected with the HIV virus in the region, which has about 10% of the world's population but more than 70% of the worldwide total of infected people. This report discusses this issue in detail, including the cause of the African AIDS epidemic, the social and economic consequences, response and treatment, and U.S. policy.
Date:
May 14, 2001
Creator:
Copson, Raymond W.
Object Type:
Report
System:
The UNT Digital Library
Air Force KC-46A Tanker Aircraft Program
This report considers the acquisition of new planes for the Air Force. Specifically, the report considers budgetary issues.
Date:
May 14, 2013
Creator:
Gertler, Jeremiah
Object Type:
Report
System:
The UNT Digital Library
Air Force KC-X Tanker Aircraft Program: Background and Issues for Congress
This report discusses the issues for Congress in FY2011, which are whether to approve, reject, or modify DOD's new KC-X competition strategy, and whether to approve, reject, or modify the Air Force's request for FY2011 research and development funding for the new KC-X program. Congress' decision on these issues could affect DOD capabilities and funding requirements, and the aircraft manufacturing industrial base.
Date:
May 14, 2010
Creator:
Gertler, Jeremiah
Object Type:
Report
System:
The UNT Digital Library
Air Quality: EPA’s 2006 Changes to the Particulate Matter (PM) Standard
In order to better understand EPA’s actions, this report provides an analysis of the agency’s final 2006 revisions to the particulates NAAQS, and the estimated costs and benefits of the new standards and of a more stringent alternatives analyzed. The report concludes by highlighting concerns and issues raised regarding the revisions to the particulates standards, including those of the science advisory committee (Clean Air Scientific Advisory Committee, or CASAC), and actions in Congress.
Date:
May 14, 2007
Creator:
Esworthy, Robert & McCarthy, James E.
Object Type:
Report
System:
The UNT Digital Library
Air Quality: EPA’s Proposed Ozone Transport Rule, OTAG, and Section 126 Petitions — A Hazy Situation?
The Environmental Protection Agency (EPA) is currently engaged in a series of regulatory actions to address the transport of ozone pollution in the eastern United States. This report reviews this situation with respect to an EPA-proposed Ozone Transport Rule and other activities.
Date:
May 14, 1998
Creator:
Parker, Larry & Blodgett, John E.
Object Type:
Report
System:
The UNT Digital Library
Air Quality: EPA's Proposed Ozone Transport Rule, OTAG, and Section 216 Petitions - A Hazy Situation?
The Environmental Protection Agency (EPA) is currently engaged in a series of regulatory actions to address the transport of ozone pollution in the eastern United States. This report reviews this situation with respect to an EPA-proposed Ozone Transport Rule and other activities.
Date:
May 14, 1998
Creator:
Parker, Larry & Blodgett, John E.
Object Type:
Report
System:
The UNT Digital Library
Air-Regulating Attachment.
Patent for a new attachment in a carburetor that regulates air through suction and has a valve to release pressure from an engine, including illustrations.
Date:
May 14, 1918
Creator:
Kimbler, Henry R.
Object Type:
Patent
System:
The Portal to Texas History
An Alpha Survey Radiac for Field Use
Abstract: An alpha survey radiac employing a photomultiplier tube and scintillation detector has been developed. The instrument utilizes transistor circuitry and operates from two standard flashlight batteries. Four linear ranges are provided with full scale indication on the highest range corresponding to 10,000 g /m2 Pu2 39. The instrument was designed with .a separable probe and a telescoping extension for easier ground monitoring. A thorium metal source is attached to the instrument housing for checking instrument calibration in the field. The device conforms satisfactorily to the military requirements for altitude, humidity, vibration, shock, and storage. The operational battery life is in excess of 40 hours. Instrument error at low temperatures slightly exceeds the 20% accuracy requirement; however, adequate measurements are readily made by using the thorium check source to provide a check point. Instrument response to low energy X-rays is excessive. However, tests indicate that a simple lead filter will eliminate this difficulty.
Date:
May 14, 1959
Creator:
Sinclair, K. & Kiyoi, G.
Object Type:
Report
System:
The UNT Digital Library
American War and Military Operations Casualties: Lists and Statistics
This report is written in response to numerous requests for war casualty statistics and lists of war dead. It provides tables, compiled by sources at the Department of Defense, indicating the number of casualties among American military personnel serving in principal wars and combat actions. For the more recent conflicts, starting with the Korean War, more detailed information on types of casualties, and when available, demographics have been included. This report also cites sources of published lists of military personnel killed in principal wars and combat actions.
Date:
May 14, 2008
Creator:
Fischer, Hannah; Klarman, Kim & Oboroceanu, Mari-Jana
Object Type:
Report
System:
The UNT Digital Library
Amorphous silicon thin films heterojunction solar cells. Second quarterly progress report, January 31-March 31, 1979
A full description is given of a glow discharge deposition system, as well as a schematic. A growth rate of 2 to 3 A/sec is reported across a total substrate diameter of 76 mm, and films of a-Si:H free of oxygen and carbon contaminants have been obtained. Other films deposited include: doped and undoped a-Si:H and a-Si/sub x/C/sub 1-x/:H, n-i-p, a-Si:H plus n-i-p, a-Si:H plus a-Si/xub x/C/sub 1-x/. Optical transmission measurements from .35 to 50 microns wavelength were made on these films. A significant difference found in the vibrational spectra is the shift of the major stretching mode from 2000 cm/sup -1/ for a-Si:H to 2100 cm/sup -1/ for the a-SiC:H. A strong broad band centered at 1000 cm/sup -1/ appears when carbon is present. (LEW)
Date:
May 14, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
AMRH and High Energy Reinicke Problem
The authors describe AMRH results on a version of the Reinicke problem specified by the V and V group of LLNL's A-Div. The simulation models a point explosion with heat conduction. The problem specification requires that the heat conduction be replaced with diffusive radiation transport. The matter and radiation energy densities are tightly coupled.
Date:
May 14, 2001
Creator:
Shestakov, A I & Greenough, J A
Object Type:
Report
System:
The UNT Digital Library
Analysis of ceramic materials for impact members in isotopic heat sources
Of the available high strength ceramics, silicon nitride offers the most promise followed by silicon carbide and aluminum oxide, and stress analyses show severe limitations on allowable velocities for impact with granite following reentry for these ceramics. Impact velocities in the 100 to 200 fps regime can be achieved only by the addition of an additional layer to distribute the high contact stress. Besides impact limitations, application of ceramic materials in heat sources would present problems both in terms of weight and fabrication. The required thickness of a ceramic impact member would be comparable to that for a carbon-carbon composite material, but the least dense of the high strength ceramics are 2 to 3 times more dense than the carbon-carbon composites. Fabrication of a ceramic heat source would require a high strength bond between the fuel and the impact member if reasonable impact velocities are to be achieved. Formation of such a bond in ceramic materials is a difficult task under normal circumstances, and would be more difficult under the restrictions imposed on the processing and handling of the /sup 238/PuO/sub 2/ fuel. 16 fig.
Date:
May 14, 1976
Creator:
Simonen, F. A. & Duckworth, W. H.
Object Type:
Report
System:
The UNT Digital Library
Analysis of In-Situ Vibration Monitoring for End-Point Detection of CMP Planarization Processes
This paper details the analysis of vibration monitoring for end-point control in oxide CMP processes. Two piezoelectric accelerometers were integrated onto the backside of a stainless steel polishing head of an IPEC 472 polisher. One sensor was placed perpendicular to the carrier plate (vertical) and the other parallel to the plate (horizontal). Wafers patterned with metal and coated with oxide material were polished at different speeds and pressures. Our results show that it is possible to sense a change in the vibration signal over time during planarization of oxide material on patterned wafers. The horizontal accelerometer showed more sensitivity to change in vibration amplitude compared to the vertical accelerometer for a given polish condition. At low carrier and platen rotation rates, the change in vibration signal over time at fixed frequencies decreased approximately ½ - 1 order of magnitude (over the 2 to 10 psi polish pressure ranges). At high rotation speeds, the vibration signal remained essentially constant indicating that other factors dominated the vibration signaL These results show that while it is possible to sense changes in acceleration during polishing, more robust hardware and signal processing algorithms are required to ensure its use over a wide range of process …
Date:
May 14, 1999
Creator:
Hetherington, Dale L.; Lauffer, James P.; Shingledecker, David M.; Stein, David J. & Wyckoff, Edward E.
Object Type:
Article
System:
The UNT Digital Library
ANALYSIS OF SPECIAL WASTE CONFIGURATIONS AT THE SRS WASTE MANAGEMENT FACILITIES
Job Control Waste (JCW) at the Savannah River Site (SRS) Solid Waste Management Facilities (SWMF) may be disposed of in special containers, and the analysis of these containers requires developing specific analysis methodologies. A method has been developed for the routine assay of prohibited items (liquids, etc.) contained in a 30-gallon drum that is then placed into a 55-gallon drum. Method development consisted of system calibration with a NIST standard at various drum-to-detector distances, method verification with a liquid sample containing a known amount of Pu-238, and modeling the inner container using Ortec Isotopic software. Using this method for measurement of the known standard in the drum-in-drum configuration produced excellent agreement (within 15%) with the known value. Savannah River Site Solid Waste Management also requested analysis of waste contained in large black boxes (commonly 18-feet x 12-feet x 7-feet) stored at the SWMF. These boxes are frequently stored in high background areas and background radiation must be considered for each analysis. A detection limit of less than 150 fissile-gram-equivalents (FGE) of TRU waste is required for the black-box analyses. There is usually excellent agreement for the measurements at different distances and measurement uncertainties of about 50% are obtained at distances …
Date:
May 14, 2007
Creator:
Casella, V & Raymond Dewberry, R
Object Type:
Article
System:
The UNT Digital Library
Analysis of trapped gas in 1E34 detonators by gas chromatography
A method was developed to extract and then analyze gas trapped in thermally aged 1E34 detonators. This gas was extracted into an evacuated volume and injected into a gas chromatograph for separation and quantitative analysis. To effect this gas extraction, a device was designed for puncturing the detonator cup and capturing the effused gas. Limited testing of five detonators in this device shows amounts of gas ranging from about 0.5 X 10 {sup -7} to 12 X 10 {sup - 7} moles.
Date:
May 14, 1980
Creator:
Warner, David K.; Back, Paul S. & Barnhart, Brady V.
Object Type:
Report
System:
The UNT Digital Library
Anisotropy in Hydrogenated Amorphous Silicon Films as Observed Using Polarized FTIR-ATR Spectroscopy
We used polarized attenuated total reflection (ATR) measurements together with Fourier transform infrared (FTIR) spectroscopy to investigate the vibrational spectra of hydrogenated amorphous silicon (a-SiH{sub x}) films 0.5-1.0 microns in thickness. We deposited the films using hot-wire or plasma-enhanced chemical vapor deposition methods (HWCVD or PECVD, respectively) on crystalline silicon and cadmium telluride substrates. Our ATR technique gave a spectral range from 2100-400 cm{sup -1}, although the Si-H wagging mode absorption band at 640 cm{sup -1} was somewhat distorted in the a-SiHx/Si samples by impurity and lattice absorption in the silicon ATR substrates. We report the identification of a Si-O-C impurity band with maximum intensity at 1240-1230 cm{sup -1}. The assignment of this band to a Si-O-C vibration is supported by secondary-ion mass spectrometry (SIMS) measurements. Our polarized FTIR-ATR spectra of HWCVD and PECVD a-SiH{sub x} films on <111> Si ATR substrates show that the impurity dipoles ar e oriented strongly parallel to the film growth direction. The wagging mode absorbance band is more intense in the film plane. This trend is less pronounced for the Si-H stretching vibrations. These observations are consistent with some degree of anisotropy or medium-range order in the films. The anisotropy in the Si-H bands …
Date:
May 14, 1999
Creator:
Webb, J. D.; Gedvilas, L. M.; Crandall, R. S.; Iwaniczko, E.; Nelson, B. P.; Mahan, A. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Application of the Principle of Maximum Conformality to the Top-Quark Forward-Backward Asymmetry at the Tevatron
The renormalization scale uncertainty can be eliminated by the Principle of Maximum Conformality (PMC) in a systematic scheme-independent way. Applying the PMC for the t{bar t}-pair hadroproduction at the NNLO level, we have found that the total cross-sections {sigma}{sub t{bar t}} at both the Tevatron and LHC remain almost unchanged when taking very disparate initial scales {mu}{sub R}{sup init} equal to m{sub t}, 10 m{sub t}, 20 m{sub t} and {radical}s, which is consistent with renormalization group invariance. As an important new application, we apply PMC scale-setting to study the top-quark forward-backward asymmetry. We observe that the more convergent perturbative series after PMC scale-setting leads to a more accurate top-quark forward-backward asymmetry. The resulting PMC prediction on the asymmetry is also free from the initial renormalization scale-dependence. Because the NLO PMC scale has a dip behavior for the (q{bar q})-channel at small subprocess collision energies, the importance of this channel to the asymmetry is increased. We observe that the asymmetries A{sub FB}{sup t{bar t}} and A{sub FB}{sup p{bar p}} at the Tevatron will be increased by 42% in comparison to the previous estimates obtained by using conventional scale-setting; i.e. we obtain A{sub FB}{sup t{bar t}PMC} {approx_equal} 12.5% and A{sub FB}{sup …
Date:
May 14, 2012
Creator:
Brodsky, Stanley J. & Wu, Xing-Gang
Object Type:
Article
System:
The UNT Digital Library
Applying a decision process for long-term stewardship planning at a US Department of Energy site.
Long-term stewardship (LTS) can be defined as the system of activities needed to protect human health and the environment from hazards left remaining at a site as a result of a cleanup decision. Although the general consensus has been that remediation decisions and LTS decisions should be made conjointly, the general practice has been to separate them. This bifurcation can result in LTS plans that are difficult to implement and enforce and disproportionately costly for the benefit they provide. Worse still, they can be ineffective and result in harmful exposures to humans and the environment. Sites that have not yet made cleanup decisions and that can still integrate LTS planning into that decision making would benefit from a process built on a systematic review of the LTS risks and costs associated with remedial alternatives that include allowing on-site residual contamination. Sites that must develop LTS plans in response to previously determined cleanup decisions are even more in need of a process that involves close scrutiny of the risks and costs of possible LTS plan components. An LTS planning decision process usable by both categories of sites has been developed and is being used at the US Department of Energy (DOE) …
Date:
May 14, 2002
Creator:
Hocking, E. K. & Smiley, S. L.
Object Type:
Article
System:
The UNT Digital Library
Aqueous Corrosion of Uranium and Alloys: Survey of Project Literature
None
Date:
May 14, 1952
Creator:
McWhirter, J. W. & Draley, J. E.
Object Type:
Report
System:
The UNT Digital Library