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110
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58
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55
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37
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The Lacey Act: Protecting the Environment by Restricting Trade
This report looks at the history and applications of the Lacey Act. As it stands now the Act, via a 2008 amendment, allows the U.S. to enforce the laws of other countries as well. One currently proposed legislation would limit application of the law to specific wood products, while another would eliminate any reference to violations of foreign laws and end criminal prosecutions for violating the act.
Date:
April 12, 2012
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Ergonomics in the Biosciences
None
Date:
April 12, 2010
Creator:
Alexandre, Melanie
Object Type:
Report
System:
The UNT Digital Library
Extraction of tritium from liquid lithium by permeation
This paper assesses a method for extracting tritium from liquid lithium for specific application to the conceptual laser fusion reactor that uses a continuous lithium ''waterfall.'' The tritium diffuses through a refractory metal that contains a getter and is then stored in a hydride-forming alloy. There are various uncertainties with this method including helium-4 extraction, unknown impurities that may accumulate in liquid lithium, the effects of these impurities on tritium separation, and the maintenance of tritium-contaminated equipment. Our study indicates that major tritium losses will occur during equipment maintenance rather than as a result of permeation losses through the primary vessel.
Date:
April 12, 1978
Creator:
Alire, R.M.
Object Type:
Report
System:
The UNT Digital Library
Vehicle-Wheel
Patent for new and useful improvements to the Vehicle-Wheel. Tire may be formed into a disk wheel constructed with nuts, bolts, rivets, and screws to compensate for any regular and irregular pressure stresses a tire may be subjected to on a road. A further improvement is to provide a more resilient disk wheel to have more durability and longer use on the road.
Date:
April 12, 1921
Creator:
Allan, William N.
Object Type:
Patent
System:
The Portal to Texas History
Automatic Sand Trap
Patent for an automatic sand trap related to automatic devices for separating suspensions into two products and is concerned with the separation of sand from water for dam building and like purposes.
Date:
April 12, 1921
Creator:
Allen, Charles
Object Type:
Patent
System:
The Portal to Texas History
Feed Spout Barrier
Patent for "a feel spout barrier for slime thickeners, settling tanks, separating tanks and the like" (lines 8-10) with instructions and illustrations.
Date:
April 12, 1921
Creator:
Allen, Charles
Object Type:
Patent
System:
The Portal to Texas History
Measurement of total ion flux in vacuum Arc discharges
A vacuum arc ion source was modified allowing us to collections from arc plasma streaming through an anode mesh. The mesh had ageometric transmittance of 60 percent, which was taken into account as acorrection factor. The ion current from twenty-two cathode materials wasmeasured at an arc current of 100 A. The ion current normalized by thearc current was found to depend on the cathode material, with valuesinthe range from 5 percent to 11 percent. The normalized ion current isgenerally greater for light elements than for heavy elements. The ionerosion rates were determined fromvalues of ion currentand ion chargestates, which were previously measured in the same experimental system.The ion erosion rates range from 12-94 mu g/C.
Date:
April 12, 2004
Creator:
Anders, Andre; Oks, Efim M.; Yushkov, Georgy Yu. & Brown, Ian G.
Object Type:
Article
System:
The UNT Digital Library
Water-Valve.
Patent for a water valve for water delivery systems that does not have standing water around it that can freeze in cold weather.
Date:
April 12, 1910
Creator:
Anthony, Joseph B. & Morris, Robert M.
Object Type:
Patent
System:
The Portal to Texas History
Trends in Discretionary Spending
This report discusses historical, current, and projected discretionary spending trends. It also describes how current discretionary spending trends reflect national priorities. Discretionary spending is provided in, and controlled by, annual appropriations acts, which fund many of the routine activities commonly associated with such federal government functions as running executive branch agencies, congressional offices and agencies, and international operations of the government.
Date:
April 12, 2010
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Building America Best Practices Series, Volume 10: Retrofit Techniques and Technologies: Air Sealing
This report was prepared by PNNL for the U.S. Department of Energy Building America Program. The report provides information to home owners who want to make their existing homes more energy efficient by sealing leaks in the building envelope (ceiling, walls, and floors) that let in drafts and let conditioned air escape. The report provides descriptions of 19 key areas of the home where air sealing can improve home performance and energy efficiency. The report includes suggestions on how to find a qualified weatherization or home performance contractor, what to expect in a home energy audit, opportune times for performing air sealing, and what safety and health concerns to be aware of. The report describes some basic building science concepts and topics related to air sealing including ventilation, diagnostic tools, and code requirements. The report will be available for free download from the DOE Building America website. It is a suitable consumer education tool for home performance and weatherization contractors to share with customers to describe the process and value of home energy retrofits.
Date:
April 12, 2010
Creator:
Baechler, Michael C.; Gilbride, Theresa L.; Hefty, Marye G.; Cole, Pamala C.; Williamson, Jennifer L. & Love, Pat M.
Object Type:
Report
System:
The UNT Digital Library
Recent Results from a Folded Waveguide ICRF Antenna Development Project
Preliminary high power tests have been performed on a folded waveguide (FWG) ICRF launcher with a curved coupling faceplate installed. Two alternative faceplate configurations have been built and tested at low power and will be tested at high power in the near future. The new designs include a dipole plate which provides a 0-<font face="symbol">p</font> launch spectrum and a more transparent, flexible monopole face plate configuration. This FWG design is a 12 vane, 57 MHz design with a 0.31 m square cross section. The FWG can be installed with either fast wave or ion-Bernstein wave polarization and can also be retracted behind a vacuum isolation valve. A 1 x 4 FWG array optimized for fast wave current drive on DIII-D has been conceptualized.
Date:
April 12, 1999
Creator:
Baity, F. W.; Barber, G. C.; Bigelow, T. S.; Carter, M. D.; Fadnek, A.; Ryan, P. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Design of RF Systems for the RTD Mission VASIMR
The first flight test of the variable specific impulse magnetoplasma rocket (VASIMR) is tentatively scheduled for the Radiation and Technology Demonstration (RTD) in 2003. This mission to map the radiation environment out to several earth radii will employ both a Hall thruster and a VASIMR during its six months duration, beginning from low earth orbit. The mission will be powered by a solar array providing 12 kW of direct current electricity at 50 V. The VASIMR utilizes radiofrequency (RF) power both to generate a high-density plasma in a helicon source and to accelerate the plasma ions to high velocity by ion cyclotron resonance heating (ICRH). The VASIMR concept is being developed by the National Aeronautics and Space Administration (NASA) in collaboration with national laboratories and universities. Prototype plasma sources, RF amplifiers, and antennas are being developed in the experimental facilities of the Advanced Space Propulsion Laboratory (ASPL).
Date:
April 12, 1999
Creator:
Baity, F. W.; Barber, G. C.; Carter, M. D.; Chang-Diaz, F. R.; Goulding, R. H.; McCaskill, G. E. et al.
Object Type:
Article
System:
The UNT Digital Library
Challenges of Algebraic Multigrid across Multicore Architectures
Algebraic multigrid (AMG) is a popular solver for large-scale scientific computing and an essential component of many simulation codes. AMG has shown to be extremely efficient on distributed-memory architectures. However, when executed on modern multicore architectures, we face new challenges that can significantly deteriorate AMG's performance. We examine its performance and scalability on three disparate multicore architectures: a cluster with four AMD Opteron Quad-core processors per node (Hera), a Cray XT5 with two AMD Opteron Hex-core processors per node (Jaguar), and an IBM BlueGene/P system with a single Quad-core processor (Intrepid). We discuss our experiences on these platforms and present results using both an MPI-only and a hybrid MPI/OpenMP model. We also discuss a set of techniques that helped to overcome the associated problems, including thread and process pinning and correct memory associations.
Date:
April 12, 2010
Creator:
Baker, A H; Gamblin, T; Schulz, M & Yang, U M
Object Type:
Article
System:
The UNT Digital Library
The Design Study of Fluid Engine Power Systems
From abstract: This report presents information generated during a six month feasibility study of an engine which uses a supercritical working fluid as the secondary portion of nuclear powered electric generating system.
Date:
April 12, 1963
Creator:
Baker, C. H.; Hunter, T. A.; Pauliukonis, R. S. & Pradhan, A. V.
Object Type:
Report
System:
The UNT Digital Library
Testing of a Continuous Sampling Mercury CEM at the EPA-Rotary Kiln Incinerator Simulator Facility
This report has been prepared to document the performance of the continuous sampling mercury monitoring system developed by Ames Laboratory for use as a continuous emission monitor (CEM). This work was funded by the U.S. Department of Energy, Office of Environmental Management, Office of Science and Technology, through the Mixed Waste Focus Area. The purpose of the project is to develop instrumentation and methods for spectroscopic field-monitoring applications. During FY01 this included continued development and testing of an echelle spectrometer system for the detection of mercury (Hg) by atomic absorption. Due to the relatively poor limits of detection for Hg by optical emission techniques, the CEM has been designed for the detection of elemental Hg by optical absorption. The sampling system allows continuous introduction of stack gas into the CEM for analysis of elemental and total Hg in the gas stream. A heated pyrolysis tube is used in this system to convert oxidized Hg compounds to elemental Hg prior to analysis for total Hg. The pyrolysis tube is bypassed to measure elemental Hg. The CEM is designed to measure the elemental Hg concentration of the gas sample, measure the total Hg concentration, perform a zero check (analysis of room air), …
Date:
April 12, 2002
Creator:
Baldwin, D. P.; Bajic, S. J.; Eckels, D. E. & Zamzow, D. S.
Object Type:
Report
System:
The UNT Digital Library
A Flexible Reservation Algorithm for Advance Network Provisioning
Many scientific applications need support from a communication infrastructure that provides predictable performance, which requires effective algorithms for bandwidth reservations. Network reservation systems such as ESnet's OSCARS, establish guaranteed bandwidth of secure virtual circuits for a certain bandwidth and length of time. However, users currently cannot inquire about bandwidth availability, nor have alternative suggestions when reservation requests fail. In general, the number of reservation options is exponential with the number of nodes n, and current reservation commitments. We present a novel approach for path finding in time-dependent networks taking advantage of user-provided parameters of total volume and time constraints, which produces options for earliest completion and shortest duration. The theoretical complexity is only O(n2r2) in the worst-case, where r is the number of reservations in the desired time interval. We have implemented our algorithm and developed efficient methodologies for incorporation into network reservation frameworks. Performance measurements confirm the theoretical predictions.
Date:
April 12, 2010
Creator:
Balman, Mehmet; Chaniotakis, Evangelos; Shoshani, Arie & Sim, Alex
Object Type:
Article
System:
The UNT Digital Library
Energy Policy: Setting the Stage for the Current Debate
The Bush Administration issued its plan for a national energy policy on May 16, 2001. The plan was controversial, characterized by some as leaner on conservation and renewables than Democratic proposals, and predisposed to trade off environmental considerations to increase supply. Comprehensive energy legislation was introduced in the Senate by both parties by late March (S. 388, S. 389, S. 596, S. 597). Bills reported by several House committees (H.R. 2436, H.R. 2460, H.R. 2511, and H.R. 2587) were combined in a single bill, H.R. 4, passed by the House, August 1, 2001. The House version of H.R. 4 would require a 5 billion gallon reduction in light-duty truck and SUV fuel consumption and would open the Arctic National Wildlife Refuge (ANWR) to leasing.
Date:
April 12, 2002
Creator:
Bamberger, Robert L.
Object Type:
Report
System:
The UNT Digital Library
THE LONGITUDINAL HIGH--FREQUENCY IMPEDANCE OF A PERIODIC ACCELERATING STRUCTURE
In many future collider and FEL designs intense, short bunches are accelerated in a linear accelerator. For example, in parts of the Linac Coherent Light Source (LCLS) a bunch with a peak current of 3.4 kA and an rms length of 30 microns will be accelerated in the SLAC linac. In such machines, in order to predict the beam quality at the end of acceleration it is essential to know the short range wakefields or, equivalently, the high frequency impedance of the accelerating structure. R. Gluckstern [1] has derived the longitudinal, high-frequency impedance of a periodic structure, a solution which is valid for a structure with a small gap-to-period ratio. We use his approach to derive a more general result, one that is not limited to small gaps. In addition, we compare our results with numerical results obtained using a field matching computer program.
Date:
April 12, 1999
Creator:
Bane, Karl L. F.
Object Type:
Report
System:
The UNT Digital Library
SCATTERING MATRIX ANALYSIS OF THE NLC ACCELERATING STRUCTURE
In the Next Linear Collider (NLC)[1], long trains of short, intense bunches are accelerated through the linac on their way to the collision point. One serious problem that needs to be addressed is the multi-bunch, beam break-up instability in the linac. To counteract this instability the accelerating structures are designed so that the dipole mode wakefields are detuned and weakly damped. Detuning is accomplished by gradually varying the dimensions of the 206 cavity cells in each structure, and weak damping by surrounding the structure with four manifolds, which allow the dipole modes to weakly couple out of the cells. In order to design and predict the performance of such a structure in the NLC, it is necessary to be able to calculate accurately the strength of its long-range wakefields. NLC detuned structures were designed first using an equivalent circuit approach, for example, the double band model of Ref. [2]. With the introduction of weak damping, a more elaborate equivalent circuit approach was required[3]. Other methods that have been used for detuned structures are the open-mode, field expansion method[4], and a finite element calculation employing 206 parallel processors[5]. A scattering matrix method can also be applied to cavities that consist of …
Date:
April 12, 1999
Creator:
Bane, Karl LF
Object Type:
Report
System:
The UNT Digital Library
Predicting Sediment and Cesium-137 Transported to Offsite During Extreme Floods
This paper presents the methods and results of a research project for predicting contaminated sediment transport from Oak Ridge Reservation to offside under potential extreme flood conditions. A computer model, Hydrologic Simulation Program--FORTRANE (HSPF), was calibrated and validated for White Oak Creek watershed using a five-year data. The model was then used to quantify the effects of a potential 100-year flood event in terms of the sediment transport and {sup 137}Cs movement. Results from computer simulation showed that during a 100-year flood event the watershed and channel bed became the major sources of the {sup 137}Cs. A 100-year flood event may result in 3.2 Ci of the total annual release of {sup 137}Cs which is six times of the averaged annual release observed during a five-year time period.
Date:
April 12, 1999
Creator:
Bao, Y.
Object Type:
Article
System:
The UNT Digital Library
International Agreements on Climate Change: Selected Legal Questions
This report provides background information on global climate change negotiations. The report discuses the United Nations framework for convention for climate change, the Kyoto protocol, and the Copenhagen accord.
Date:
April 12, 2010
Creator:
Barbour, Emily C.
Object Type:
Report
System:
The UNT Digital Library
Metal boride catalysts for indirect liquefaction. Quarterly technical progress report, December 1, 1983-February 29, 1984
During the sixth quarter four boron-promoted cobalt catalysts were prepared by a new boriding process using diborane gas as the boriding agent. These catalysts were characterized by chemical analysis, BET, H/sub 2/ chemisorption, and x-ray diffraction. Temperature-programmed desorption spectra of H/sub 2/ were obtained for a sodium-promoted cobalt boride and a sodium-promoted Co/SiO/sub 2/. Four cobalt catalysts (unsupported, boron-promoted, sodium-promoted, and doubly-promoted) were tested for CO hydrogenation activity and selectivity at 1 atm and 3 to 4 temperatures in the range of 190 to 240/sup 0/C. About 10% of the surface of cobalt boride consists of reduced metallic cobalt. The addition of sodium to cobalt increases its binding energy with H/sub 2/ and its activation energy for H/sub 2/ adsorption. Boron does not affect the activity of cobalt; sodium decreases it by a factor of 10. Cobalt boride produces lighter hydrocarbon products relative to cobalt; sodium-promoted cobalt produces heavier products, more alcohols, and more CO/sub 2/. 29 references, 10 figures, 4 tables.
Date:
April 12, 1984
Creator:
Bartholomew, C. H.
Object Type:
Report
System:
The UNT Digital Library
Local One-Dimensional ICRF Full-Wave Solutions Valid to All Orders in k-Perpendicular-Rho
High harmonic ion cyclotron resonances are important for understanding future fast wave heating experiments on NSTX 1 as well as recent ICRF flow drive experiments on PBX-M<sup>2</sup> and TFTR<sup>3</sup>. Unfortunately, many of our ICRF wave analysis codes are based on an expansion to second order in k-perpendicular-Rho where k-perpendicular is the perpendicular wave number, and Rho is the Larmor radius. Such codes are limited to cyclotron harmonics less than or equal to 2. Integral codes<sup>4,5</sup> on the other hand, are valid to all orders in both k-perpendicular-Rho and Rho/<i>L</i>L where <i>L</i> is the equilibrium scale length. But velocity space integrals in these codes require long running times. Here we take a simpler approach which assumes a local plasma conductivity (Rho/<i>L</i> << 1), while still retaining all orders in k-perpendicular-Rho. This allows high harmonic fast wave and flow drive applications, while requiring less computing time than conventional integral codes.
Date:
April 12, 1999
Creator:
Batchelor, D. B.; Berry, L. A. & Jaeger, E. F.
Object Type:
Article
System:
The UNT Digital Library
Accessibillity of Electron Bernstein Modes in Over-Dense Plasma
Mode-conversion between the ordinary, extraordinary and electron Bernstein modes near the plasma edge may allow signals generated by electrons in an over-dense plasma to be detected. Alternatively, high frequency power may gain accessibility to the core plasma through this mode conversion process. Many of the tools used for ion cyclotron antenna de-sign can also be applied near the electron cyclotron frequency. In this paper, we investigate the possibilities for an antenna that may couple to electron Bernstein modes inside an over-dense plasma. The optimum values for wavelengths that undergo mode-conversion are found by scanning the poloidal and toroidal response of the plasma using a warm plasma slab approximation with a sheared magnetic field. Only a very narrow region of the edge can be examined in this manner; however, ray tracing may be used to follow the mode converted power in a more general geometry. It is eventually hoped that the methods can be extended to a hot plasma representation. Using antenna design codes, some basic antenna shapes will be considered to see what types of antennas might be used to detect or launch modes that penetrate the cutoff layer in the edge plasma.
Date:
April 12, 1999
Creator:
Batchelor, D. B.; Bigelow, T. S. & Carter, M. D.
Object Type:
Article
System:
The UNT Digital Library