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4,170 Matching Results
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4,170
Transverse instability of a rectangular bunch
Transverse instability of a rectangular bunch is investigated. Known theory of bunched beam instability is modified to take into account 100% spread of synchrotron frequency. Series of equations adequately describing the instability is derived and solved analytically and numerically. The theory is applied to the Fermilab Recycler Ring.
Date:
December 1, 2005
Creator:
Balbekov, V.
Object Type:
Article
System:
The UNT Digital Library
The transverse space-charge force in tri-gaussian distribution
In tracking, the transverse space-charge force can be represented by changes in the horizontal and vertical divergences, {Delta}x{prime} and {Delta}y{prime} at many locations around the accelerator ring. In this note, they are going to list some formulas for {Delta}x{prime} and {delta}y{prime} arising from space-charge kicks when the beam is tri-Gaussian distributed. They will discuss separately a flat beam and a round beam. they are not interested in the situation when the emittance growth arising from space charge becomes too large and the shape of the beam becomes weird. For this reason, they can assume the bunch still retains its tri-Gaussian distribution, with its rms sizes {sigma}{sub x}, {sigma}{sub y}, and {sigma}{sub z} increasing by certain factors. Thus after each turn, {sigma}{sub x}, {sigma}{sub y}, and {sigma}{sub z} can be re-calculated.
Date:
December 1, 2005
Creator:
Ng, King-Yuen
Object Type:
Report
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 97, No. 48, Ed. 1 Thursday, December 1, 2005
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
December 1, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Ultra-cold molecule production.
The production of Ultra-cold molecules is a goal of many laboratories through out the world. Here we are pursuing a unique technique that utilizes the kinematics of atomic and molecular collisions to achieve the goal of producing substantial numbers of sub Kelvin molecules confined in a trap. Here a trap is defined as an apparatus that spatially localizes, in a known location in the laboratory, a sample of molecules whose temperature is below one degree absolute Kelvin. Further, the storage time for the molecules must be sufficient to measure and possibly further cool the molecules. We utilize a technique unique to Sandia to form cold molecules from near mass degenerate collisions between atoms and molecules. This report describes the progress we have made using this novel technique and the further progress towards trapping molecules we have cooled.
Date:
December 1, 2005
Creator:
Ramirez-Serrano, Jamie; Chandler, David W.; Strecker, Kevin & Rahn, Larry A.
Object Type:
Report
System:
The UNT Digital Library
Uncertainty analysis of steady state incident heat flux measurements in hydrocarbon fuel fires.
The objective of this report is to develop uncertainty estimates for three heat flux measurement techniques used for the measurement of incident heat flux in a combined radiative and convective environment. This is related to the measurement of heat flux to objects placed inside hydrocarbon fuel (diesel, JP-8 jet fuel) fires, which is very difficult to make accurately (e.g., less than 10%). Three methods will be discussed: a Schmidt-Boelter heat flux gage; a calorimeter and inverse heat conduction method; and a thin plate and energy balance method. Steady state uncertainties were estimated for two types of fires (i.e., calm wind and high winds) at three times (early in the fire, late in the fire, and at an intermediate time). Results showed a large uncertainty for all three methods. Typical uncertainties for a Schmidt-Boelter gage ranged from {+-}23% for high wind fires to {+-}39% for low wind fires. For the calorimeter/inverse method the uncertainties were {+-}25% to {+-}40%. The thin plate/energy balance method the uncertainties ranged from {+-}21% to {+-}42%. The 23-39% uncertainties for the Schmidt-Boelter gage are much larger than the quoted uncertainty for a radiative only environment (i.e ., {+-}3%). This large difference is due to the convective contribution …
Date:
December 1, 2005
Creator:
Nakos, James Thomas
Object Type:
Report
System:
The UNT Digital Library
Updated Generation IV Reactors Integrated Materials Technology Program Plan, Revision 2
The Department of Energy's (DOE's) Generation IV Nuclear Energy Systems Program will address the research and development (R&D) necessary to support next-generation nuclear energy systems. Such R&D will be guided by the technology roadmap developed for the Generation IV International Forum (GIF) over two years with the participation of over 100 experts from the GIF countries. The roadmap evaluated over 100 future systems proposed by researchers around the world. The scope of the R&D described in the roadmap covers the six most promising Generation IV systems. The effort ended in December 2002 with the issue of the final Generation IV Technology Roadmap [1.1]. The six most promising systems identified for next generation nuclear energy are described within the roadmap. Two employ a thermal neutron spectrum with coolants and temperatures that enable hydrogen or electricity production with high efficiency (the Supercritical Water Reactor - SCWR and the Very High Temperature Reactor - VHTR). Three employ a fast neutron spectrum to enable more effective management of actinides through recycling of most components in the discharged fuel (the Gas-cooled Fast Reactor - GFR, the Lead-cooled Fast Reactor - LFR, and the Sodium-cooled Fast Reactor - SFR). The Molten Salt Reactor (MSR) employs a …
Date:
December 1, 2005
Creator:
Corwin, William R.; Burchell, Timothy D.; Halsey, William; Hayner, George; Katoh, Yutai; Klett, James William et al.
Object Type:
Report
System:
The UNT Digital Library
Use of a Paraffin Based Grout to Stabilize Buried Beryllium and Other Wastes
The long term durability of WAXFIXi, a paraffin based grout, was evaluated for in situ grouting of activated beryllium wastes in the Subsurface Disposal Area (SDA), a radioactive landfill at the Radioactive Waste Management Complex, part of the Idaho National Laboratory (INL). The evaluation considered radiological and biological mechanisms that could degrade the grout using data from an extensive literature search and previous tests of in situ grouting at the INL. Conservative radioactive doses for WAXFIX were calculated from the "hottest" (i.e., highest-activity) Advanced Test Reactor beryllium block in the SDA.. These results indicate that WAXFIX would not experience extensive radiation damage for many hundreds of years. Calculation of radiation induced hydrogen generation in WAXFIX indicated that grout physical performance should not be reduced beyond the effects of radiation dose on the molecular structure. Degradation of a paraffin-based grout by microorganisms in the SDA is possible and perhaps likely, but the rate of degradation will be at a slower rate than found in the literature reviewed. The calculations showed the outer 0.46 m (18 in.) layer of each monolith, which represents the minimum expected distance to the beryllium block, was calculated to require 1,000 to 3,600 years to be consumed. …
Date:
December 1, 2005
Creator:
Matthern, Gretchen; Hanson, Duane; Yancey, Neal & Knudson, Darrell
Object Type:
Article
System:
The UNT Digital Library
User's Guide to BModes (Software for Computing Rotating Beam-Coupled Modes)
This guide explains data preparation and execution with BModes, a finite-element code that provides dynamically coupled modes for a beam. The beam can be a rotating or non-rotating rotor blade or a tower, and it can have arbitrary distribution of structural properties and geometry along its length. A coupled mode implies presence of coupled flexural, axial, and torsion motions in a natural mode of vibration. Knowledge of flap-lag-torsion-axial coupled modes is crucial to several applications. Examples are: accurate modeling of major flexible components for modal-based aeroelastic codes such as FAST (Fatigue, Aerodynamics, Structures, and Turbulence), validation of flexible component models using experimental data, modal-based fatigue analysis, and interpretation of aeroelastic-stability behavior of turbines. Our plan is to eventually integrate BModes with FAST to provide tower and blade modes as rotor speed and blade pitch control settings change during a simulation. This guide provides step-by-step instructions on how to prepare input files (specify blade geometry, section properties, and finite-element discretization), how to execute the code, and how to interpret the outputs.
Date:
December 1, 2005
Creator:
Bir, G.
Object Type:
Report
System:
The UNT Digital Library
Using a Sweating Manikin, Controlled by a Human Physiological Model, to Evaluate Liquid Cooling Garments
This paper discusses the use of NREL's Advanced Automotive Manikin (ADAM) for evaluating NASA's liquid cooling garments for space suits.
Date:
December 1, 2005
Creator:
Farrington, R.; Rugh, J.; Bharathan, D.; Paul, H.; Bue, G. & Trevino, L.
Object Type:
Article
System:
The UNT Digital Library
Using Ice to Mimic Nacre: From Structural Materials to ArtificialBone
None
Date:
December 1, 2005
Creator:
Deville, Sylvain; Saiz, Eduardo; Nalla, Ravi K. & Tomsia, Antoni P.
Object Type:
Article
System:
The UNT Digital Library
Verification and Validation of TMAP7
The Tritium Migration Analysis Program, Version 7 (TMAP7) code is an update of TMAP4, an earlier version that was verified and validated in support of the International Thermonuclear Experimental Reactor (ITER) program and of the intermediate version TMAP2000. It has undergone several revisions. The current one includes radioactive decay, multiple trap capability, more realistic treatment of heteronuclear molecular formation at surfaces, processes that involve surface-only species, and a number of other improvements. Prior to code utilization, it needed to be verified and validated to ensure that the code is performing as it was intended and that its predictions are consistent with physical reality. To that end, the demonstration and comparison problems cited here show that the code results agree with analytical solutions for select problems where analytical solutions are straightforward or with results from other verified and validated codes, and that actual experimental results can be accurately replicated using reasonable models with this code. These results and their documentation in this report are necessary steps in the qualification of TMAP7 for its intended service.
Date:
December 1, 2005
Creator:
Ambrosek, James & Ambrosek, James
Object Type:
Report
System:
The UNT Digital Library
Verification and Validation of TMAP7
The Tritium Migration Analysis Program, Version 7 (TMAP7) code is an update of TMAP4, an earlier version that was verified and validated in support of the International Thermonuclear Experimental Reactor (ITER) program and of the intermediate version TMAP2000. It has undergone several revisions. The current one includes radioactive decay, multiple trap capability, more realistic treatment of heteronuclear molecular formation at surfaces, processes that involve surface-only species, and a number of other improvements. Prior to code utilization, it needed to be verified and validated to ensure that the code is performing as it was intended and that its predictions are consistent with physical reality. To that end, the demonstration and comparison problems cited here show that the code results agree with analytical solutions for select problems where analytical solutions are straightforward or with results from other verified and validated codes, and that actual experimental results can be accurately replicated using reasonable models with this code. These results and their documentation in this report are necessary steps in the qualification of TMAP7 for its intended service.
Date:
December 1, 2005
Creator:
Ambrosek, James & Ambrosek, James
Object Type:
Report
System:
The UNT Digital Library
Violence Against Women Act: History and Federal Funding
This report provides a brief legislative history of the Violence Against Women Act (VAWA) and an overview of the crimes addressed through VAWA. It concludes with a brief description of the most recent reauthorization of VAWA.
Date:
December 1, 2005
Creator:
Laney, Garrine P.
Object Type:
Report
System:
The UNT Digital Library
Water Consumption from Freeze Protection Valves for Solar Water Heating Systems
Conference paper regarding research in the use of freeze protection valves for solar domestic water heating systems in cold climates.
Date:
December 1, 2005
Creator:
Burch, J. & Salasovich, J.
Object Type:
Article
System:
The UNT Digital Library
What can gamma ray bursts teach us about dark energy?
It has been suggested that Gamma Ray Bursts (GRB) may enable the expansion rate of our Universe to be measured out to very high redshifts (z {approx}> 5) just as type Ia supernovae have done at z {approx} 1-1.5. We explore this possibility here, and find that GRB have the potential to detect dark energy at high statistical significance, but they are unlikely to be competitive with future supernovae missions, such as SNAP, in measuring the properties of the dark energy. The exception to this conclusion is if there is appreciable dark energy at early times, in which case the information from GRB's will provide an excellent complement to the z {approx} 1 information from supernovae.
Date:
December 1, 2005
Creator:
Hooper, Dan & Dodelson, Scott
Object Type:
Article
System:
The UNT Digital Library
WIPP Subsidence Monument Leveling Survey - 2005
Sections 2 through 7 of this report define the result of the 2005 leveling survey through the subsidence monuments at the WIPP site. Approximately 15 miles of leveling was completed through nine vertical control loops. The 2005 survey includes the determination of elevation on each of the 48 existing subsidence monuments and the WIPP baseline survey, and 14 of the National Geodetic Survey’s (NGS) vertical control points. The field observations were completed during September through November of 2005 by personnel from the Washington TRU Solutions (WTS) Surveying Group, Mine Engineering Department. Additional rod personnel were provided by the Geotechnical Engineering Department. Digital leveling techniques were utilized to achieve better than Second Order Class II loop closures as outlined by the Federal Geodetic Control Subcommittee (FGCS). Because it is important to perform the subsidence survey in exactly the same manner each year, WIPP procedure (WP 09-ES4001) details each step of the survey. Starting with the 2002 survey this procedure has been used to perform the subsidence survey. Starting with the survey of the year 2001, Loop 1 and redundant survey connections among the various loops were removed from the survey and report. This resulted in a reduction of fieldwork with no …
Date:
December 1, 2005
Creator:
Westinghouse TRU Solutions LLC
Object Type:
Report
System:
The UNT Digital Library
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 103, No. 35, Ed. 1 Thursday, December 1, 2005
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 1, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Yellow Jacket (Brownwood, Tex.), [Vol. 96], No. 7, Ed. 1, Thursday, December 1, 2005
Weekly student newspaper from Howard Payne University in Brownwood, Texas that includes local, state and campus news along with advertising.
Date:
December 1, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History