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101
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59
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Free-Spinning-Tunnel Tests of a 1/24-Scale Model of the North American XP-86 Airplane
"A spin investigation has been conducted in the Langley 20-foot free-spinning tunnel on a 1/24-scale model of the North American XP-86 airplane. The effects of control settings and movements upon the erect and inverted spin and recovery characteristics of the model were determined for the design gross weight loading. The long-range loading was also investigated and the effects of extending slats and dive flaps were determined" (p. 1).
Date:
May 17, 1948
Creator:
Berman, Theodore
Object Type:
Report
System:
The UNT Digital Library
Intelligence Issues for Congress
To address the challenges facing the U.S. intelligence community in the 21st century, congressional and executive branch initiatives have sought to improve coordination among the different agencies and to encourage better analysis. In December 2004, the Intelligence Reform and Terrorism Prevention Act (P.L. 108-458) was signed, providing for a Director of National Intelligence (DNI) with substantial authorities to manage the national intelligence effort. The legislation also established a separate Director of the Central Intelligence Agency.
Date:
May 17, 2011
Creator:
Best, Richard A., Jr.
Object Type:
Report
System:
The UNT Digital Library
Foreign Travel Report - West Germany and Belgium - September 9 - September 13, 1985
This report discusses visitation of the PAMELA plant which provided an opportunity to observe the operation and design of this European waste solidification facility. The aim of the workshop was to exchange expertise relative to the safe vitrification of HLLW in order to determine which areas were technologically solved and which areas required further study.
Date:
May 17, 2001
Creator:
Bickford, D.F.
Object Type:
Report
System:
The UNT Digital Library
Nanoporous Metal - Combining Strength and Porosity
Recent nanomechanical tests on submicron metal columns and wires have revealed a dramatic increase in yield strength with decreasing sample size. This effect seems to be related to the increased strength observed in metals on decreasing grain size or film thickness, and has been explained by a dislocation nucleation/activation controlled plasticity regime in small sample volumes. The question arises whether one can utilize this new size effect to design materials with improved bulk properties. Here, we demonstrate that nanoporous metal foams can be envisioned as a three-dimensional network of ultrahigh-strength nanocolumns/wires, thus bringing together two seemingly conflicting properties: high strength and high porosity. Specifically, we studied the mechanical properties of nanoporous (np) Au using a combination of nanoindentation and column microcompression tests, as well as supplemental molecular dynamics simulations. We find that np-Au can be as strong as bulk Au, despite being a highly porous material, and that the ligaments in np-Au approach the theoretical yield strength of Au. The combination of high yield strength and high porosity can be used to design a new generation of energy absorbing materials for various engineering applications.
Date:
May 17, 2006
Creator:
Biener, J; Hodge, A M; Hayes, J R; Volkert, C A; Zepeda-Ruiz, L A; Hamza, A V et al.
Object Type:
Article
System:
The UNT Digital Library
A Transmissive Optics Approach for Time-Slicing the LCLS X-Ray Pulse
This paper investigates the use of off-axis zone plate optical systems to deliver time-sliced LCLS FEL pulses to users under the 3 energy chirp scenarios elucidated by P. Emma. We present formulas for designing off-axis zone plate optical systems that achieve a given time-slice duration and intensity. The results show that it is feasible to fabricate zone-plate systems capable of providing intense spots of time-sliced 8.275 KeV photons under the scenario of a 2.0% chirp, but that it is beyond current and envisioned fabrication capabilities to create zone-plate systems of similar performance under the scenarios offering energy chirps of < 0.25%. Finally we present results of numerical calculations of the electric fields delivered to the user by an off-axis zone plate optical system producing time-slices of {le} 50 {center_dot} fs with photon densities of 200 photons/{angstrom}{sup 2} under the 2% energy chirp scenario.
Date:
May 17, 2000
Creator:
Bionta, R. M.
Object Type:
Report
System:
The UNT Digital Library
Polymer Self Assembly for Electronic Devices
None
Date:
May 17, 2011
Creator:
Black, C.T.
Object Type:
Presentation
System:
The UNT Digital Library
Foodstuff Concentrations Following a SRTC Tritium Oxide Release
The ingestion pathway consequences following a postulated accidental tritium release from the Savannah River Technology Center are evaluated.
Date:
May 17, 1999
Creator:
Blanchard, A.
Object Type:
Report
System:
The UNT Digital Library
Relocation Impacts of a Major Release from SRTC
The relocation impacts of an accidental release, scenario 1-RD-3 , are evaluated for the Savannah River Technology Center. The extent of the area potentially contaminated to a level that would result in doses exceeding the relocation protective action guide is calculated.
Date:
May 17, 1999
Creator:
Blanchard, A.
Object Type:
Report
System:
The UNT Digital Library
Abortion and Family Planning-Related Provisions in U.S. Foreign Assistance Law and Policy
This report details legislation and policies that restrict or place requirements on U.S. funding of abortion or family planning activities abroad. The level and extent of federal funding for these activities is an ongoing and controversial issue in U.S. foreign assistance and will likely continue to be a point of contention during the 114th Congress.
Date:
May 17, 2016
Creator:
Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library
Radiographic examination of production fuels
None
Date:
May 17, 1963
Creator:
Blasewitz, A. G.
Object Type:
Report
System:
The UNT Digital Library
Prediction of Gas Injection Performance for Heterogeneous Reservoirs
This report describes research carried out in the Department of Petroleum Engineering at Stanford University from September 1997 - September 1998 under the second year of a three-year grant from the Department of Energy on the "Prediction of Gas Injection Performance for Heterogeneous Reservoirs." The research effort is an integrated study of the factors affecting gas injection, from the pore scale to the field scale, and involves theoretical analysis, laboratory experiments, and numerical simulation. The original proposal described research in four areas: (1) Pore scale modeling of three phase flow in porous media; (2) Laboratory experiments and analysis of factors influencing gas injection performance at the core scale with an emphasis on the fundamentals of three phase flow; (3) Benchmark simulations of gas injection at the field scale; and (4) Development of streamline-based reservoir simulator. Each state of the research is planned to provide input and insight into the next stage, such that at the end we should have an integrated understanding of the key factors affecting field scale displacements.
Date:
May 17, 1999
Creator:
Blunt, Martin J. & Orr, Franklin M.
Object Type:
Report
System:
The UNT Digital Library
Restructuring DOE and Its Laboratories: Issues in the 106th Congress
A number of legislative proposals to restructure or eliminate the Department of Energy (DOE) and the DOE laboratories have been introduced since the end of the Cold War, especially since the beginning of the 104th Congress. This legislation has been introduced because of perceived major problems with DOE, including its overall mission. Sponsors state, for example, that about 85% of DOE's budget is for non-energy programs, even though the nation's dependency on foreign energy sources has increased since the establishment of the department. Also of concern is the department's failure to go far enough, in their view, in solving its long-term management problems, downsizing, and reducing budgets.
Date:
May 17, 2000
Creator:
Boesman, William C.
Object Type:
Report
System:
The UNT Digital Library
PRELIMINARY ANALYSIS OF SUPERCHARGED NUCLEAR RAMJET PROPULSION SYSTEM
A preliminary analysis has been made to compare the performance.of a ceramic ramjet reactor powerplant, such as described in General Electric Report No. XDC-56-5-81, with that of such a powerplant supercharged by a metallic-vapor-cycle compressor jet. Performance at sea level, Mach 2.5 is ·reported for the vapor-cycle compressor jet alone, for the ramjet alone, and for the compressor jet - ramjet combination. Results indicate that adding the compressor-jet as a supercharger for the ramjet provides an increase in specific thrust of about 20 percent over that of the ramjet alone, with an attendant increase in thermal efficiency of about 20 percent over that of the ramjet alone.
Date:
May 17, 1957
Creator:
Boppart, J. A.
Object Type:
Report
System:
The UNT Digital Library
Development of Extraction Techniques for the Detection of Signature Lipids from Oil
Pure cultures, including Desulfovibrio vulgaris and Methanococcus maripaludus, were combined with model oil samples and oil/diesel mixtures to optimize extraction techniques of signature lipids from oil in support of investigation of microbial communities in oil deposit samples targets for microbial enhanced hydrocarbon recovery. Several techniques were evaluated, including standard phospholipid extraction, ether linked lipid for Archaeal bacterial detection, and high pressure extractiontechniques. Recovery of lipids ranged from 50-80percent as compared to extraction of the pure culture. Extraction efficiency was evaluated by the use of internal standards. Field samples will also be tested for recovery of signature lipids with optimized extraction techniques.
Date:
May 17, 2010
Creator:
Borglin, Sharon; Geller, Jil; Chakraborty, Romy; Hazen, Terry & Mason, Olivia
Object Type:
Report
System:
The UNT Digital Library
A computer simulation appraisal of non-residential low energy cooling systems in California
An appraisal of the potential performance of different Low Energy Cooling (LEC) systems in nonresidential buildings in California is being conducted using computer simulation. The paper presents results from the first phase of the study, which addressed the systems that can be modeled, with the DOE-2.1E simulation program. The following LEC technologies were simulated as variants of a conventional variable-air-volume system with vapor compression cooling and mixing ventilation in the occupied spaces: Air-side indirect and indirect/direct evaporative pre-cooling. Cool beams. Displacement ventilation. Results are presented for four populous climates, represented by Oakland, Sacramento, Pasadena and San Diego. The greatest energy savings are obtained from a combination of displacement ventilation and air-side indirect/direct evaporative pre-cooling. Cool beam systems have the lowest peak demand but do not reduce energy consumption significantly because the reduction in fan energy is offse t by a reduction in air-side free cooling. Overall, the results indicate significant opportunities for LEC technologies to reduce energy consumption and demand in nonresidential new construction and retrofit.
Date:
May 17, 2002
Creator:
Bourassa, Norman; Haves, Philip & Huang, Joe
Object Type:
Article
System:
The UNT Digital Library
In-situ observations of adsorption and film formation on metal electrodes by synchrotron far infrared reflectance spectroscopy.
Adsorption and film formation are key processes associated with the passivation and inhibition of metallic corrosion. New experimental approaches are needed to advance our knowledge in these areas. We have developed the technique of Synchrotron Far Infrared Reflectance Spectroscopy (SFIRS) for in situ investigations of the structure and composition of surface films and adsorbed layers on metals. We demonstrate its application to the determination of the nature of surface films on copper in aqueous solutions and the adsorption of anions on gold. The anodic corrosion films on copper in alkaline solution were found to consist of Cu{sub 2}O in the passive region at about {minus}0.05 V vs SCE and CUO, together with CU(OH){sub 2}, at 0.30 V. We have also observed for the first time the adsorption of anions at monolayer coverage on the surface of a gold electrode in perchloric acid solution. Halides (Cl-, Br-), nitrate, sulfate, and phosphate have been studied. When two different anions are present in solution, the more strongly adsorbed species determines the corrosion behavior of the metal. This is illustrated in the competitive adsorption of bromide and phosphate on gold.
Date:
May 17, 1999
Creator:
Bowmaker, G. A.; Hahn, F.; Leger, J. M. & Melendres, C. A.
Object Type:
Article
System:
The UNT Digital Library
Concluding Report of Free-Spinning, Tumbling, and Recovery Characteristics of a 1/18-Scale Model of the Ryan X-13 Airplane, Coord. No. AF-199
"An investigation has been completed in the Langley 20-foot free-spinning tunnel on a l/18-scale model of the Ryan X-13 airplane to determine its spin, recovery, and tumbling characteristics, and to determine the minimum altitude from which a belly landing could be made in case of power failure in hovering flight. Model spin tests were conducted with and without simulated engine rotation. Tests without simulated engine rotation indicated two types of spins: one, a slightly oscillatory flat spin; and the other, a violently oscillatory spin" (p. 1).
Date:
May 17, 1957
Creator:
Bowman, James S., Jr.
Object Type:
Report
System:
The UNT Digital Library
Summer investigations into the metabolic diversity of the microbial world
The philosophy of the course described here is to underscore the essence of microbiology which is diversity>: diversity of morphology and cellular development, behavior, and metabolic and physiological functions. Emphasis is on microbes other than those customarily covered in conventional microbiology courses and includes: the archaebacteria, extremophiles, and array of obligate anaerobes, various phototrophs, and those microbes exhibiting complex developmental cycles. Also included are microbes carrying out a variety of transformations of organic and inorganic compounds, as well as those which normally occur in symbiotic association with other microbes or with higher forms of life.
Date:
May 17, 1993
Creator:
Breznak, J. & Dworkin, M.
Object Type:
Report
System:
The UNT Digital Library
Summer investigations into the metabolic diversity of the microbial world. Progress report, May 5, 1992--April 30, 1993
The philosophy of the course described here is to underscore the essence of microbiology which is diversity>: diversity of morphology and cellular development, behavior, and metabolic and physiological functions. Emphasis is on microbes other than those customarily covered in conventional microbiology courses and includes: the archaebacteria, extremophiles, and array of obligate anaerobes, various phototrophs, and those microbes exhibiting complex developmental cycles. Also included are microbes carrying out a variety of transformations of organic and inorganic compounds, as well as those which normally occur in symbiotic association with other microbes or with higher forms of life.
Date:
May 17, 1993
Creator:
Breznak, J. & Dworkin, M.
Object Type:
Report
System:
The UNT Digital Library
Characterization of Microbial Communities from Pristine and Chlorinated-Ethene-Contaminated Landfill Groundwater
Molecular, phospholipid fatty acid analysis (PLFA), and substrate utilization (BIOLOG) techniques were used to assess structural and functional differences between microbial communities from a chlorinated-ethene (CE)-contaminated groundwater at a sanitary landfill. The information will be used to evaluate natural attenuation of the associated CE plume. Two groundwater-monitoring wells were tested.
Date:
May 17, 2002
Creator:
Brigmon, R.L.
Object Type:
Article
System:
The UNT Digital Library
Molecular Dynamics Simulations of Coulomb Explosion
A swift ion creates a track of electronic excitations in the target material. A net repulsion inside the track can cause a ''Coulomb Explosion'', which can lead to damage and sputtering of the material. Here we report results from molecular-dynamics (MD) simulations of Coulomb explosion for a cylindrical track as a function of charge density and neutralization/quenching time, {tau}. Screening by the free electrons is accounted for using a screened Coulomb potential for the interaction among charges. The yield exhibits a prompt component from the track core and a component, which dominates at higher excitation density, from the heated region produced. For the cases studied, the number of atoms ejected per incident ion, i.e. the sputtering yield Y, is quadratic with charge density along the track as suggested by simple models. Y({tau} = 0.2 Debye periods) is nearly 20% of the yield when there is no neutralization ({tau} {yields} {infinity}). The connections between ''Coulomb explosions'', thermal spikes and measurements of electronic sputtering are discussed.
Date:
May 17, 2002
Creator:
Bringa, E M
Object Type:
Article
System:
The UNT Digital Library
Geochemical constraints on ocean general circulation models. Final report, May 1, 1995--April 30, 1997
A better understanding of the manner in which the ocean operates is essential to the preparation for the consequences of the generation of CO{sub 2} by fossil fuel burning. Examples are as follows: (1) the ocean will ultimately take up a major fraction of the CO{sub 2} produced, but this uptake is retarded by the slow mixing rates, in order to predict the uptake, researchers must develop and validate general circulation models for the ocean; (2) during glacial time large global climate changes occurred. The changes were abrupt happening in a few decades. The trigger for these changes appears to have been reorganizations of the large-scale thermohaline circulation of the ocean. Models suggest that if the CO{sub 2} content of the atmosphere rises to more than 700 ppm, then a possibility exists that another such reorganization might occur. Hence, researchers must learn more about the factors influencing deep-water formation both in the northern Atlantic and in the Souther Ocean. The thrust of this research was to develop constraints based on the distributions of chemicals and tracers in the sea. The accomplishments are outlined in this report.
Date:
May 17, 1998
Creator:
Broecker, W. S.
Object Type:
Report
System:
The UNT Digital Library
Formal Specification of the OpenMP Memory Model
OpenMP [1] is an important API for shared memory programming, combining shared memory's potential for performance with a simple programming interface. Unfortunately, OpenMP lacks a critical tool for demonstrating whether programs are correct: a formal memory model. Instead, the current official definition of the OpenMP memory model (the OpenMP 2.5 specification [1]) is in terms of informal prose. As a result, it is impossible to verify OpenMP applications formally since the prose does not provide a formal consistency model that precisely describes how reads and writes on different threads interact. This paper focuses on the formal verification of OpenMP programs through a proposed formal memory model that is derived from the existing prose model [1]. Our formalization provides a two-step process to verify whether an observed OpenMP execution is conformant. In addition to this formalization, our contributions include a discussion of ambiguities in the current prose-based memory model description. Although our formal model may not capture the current informal memory model perfectly, in part due to these ambiguities, our model reflects our understanding of the informal model's intent. We conclude with several examples that may indicate areas of the OpenMP memory model that need further refinement however it is specified. …
Date:
May 17, 2006
Creator:
Bronevetsky, G & de Supinski, B R
Object Type:
Article
System:
The UNT Digital Library
HORIZONTAL LIFTING OF 5 DHLW/DOE LONG, 12-PWR LONG AND 24-BWR WASTE PACKAGES
The objective of this calculation was to determine the structural response of a 12-Pressurized Water Reactor (PWR) Long, a 24-Boiling Water Reactor (BWR) and a 5-Defense High Level Waste/Department of Energy (DHLW/DOE)--Long spent nuclear fuel waste packages lifted in a horizontal position. The scope of this calculation was limited to reporting the calculation results in terms of maximum stress intensities in the trunnion collar sleeves. In addition, the maximum stress intensities in the inner and outer shells of the waste packages were presented for illustrative purposes. The information provided by the sketches (Attachments I, II and III) is that of the potential design of the types of waste packages considered in this calculation, and all obtained results are valid for these designs only. This calculation is associated with the waste package design and was performed by the Waste Package Design Section in accordance with the ''Technical work plan for: Waste Package Design Description for LA'' (Ref. 7). AP-3.12Q, Calculations (Ref. 13), was used to perform the calculation and develop the document.
Date:
May 17, 2001
Creator:
Brosse, V. de la
Object Type:
Report
System:
The UNT Digital Library