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204
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51
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28
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12
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8
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8
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6
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Office of Scientific & Technical Information Technical Reports
147
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106
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Tocker Foundation Grant
54
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29
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21
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14
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12
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11
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Degree Department
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Common Mode Rejection Calculations on the Debuncher Upgrade
The 4-8 GHz Transverse Debuncher Cooling Systems are power limited. Misalignments and imperfections in the transverse pickup arrays will generate a longitudinal signal in addition to the betatron signal. This longitudinal signal can use up a significant fraction of the precious TWT power if the imperfections are large enough. This note will summarize calculations of the contributions to the longitudinal signal observed in the transverse systems of the 4-8 GHz Debuncher slow-wave pickup arrays due to various misalignments and imperfections.
Date:
February 2, 2001
Creator:
McGinnis, Dave
Object Type:
Report
System:
The UNT Digital Library
Proposed Magnet Alignment Changes for AP-1
AP-1 was built to connect the Antiproton Source with the Main Ring accelerator. The beamline was designed to support modes of operation at both 8 GeV and 120 GeV kinetic energy. During the days of Main Ring operation, 120 GeV beam was extracted through the field region of a Lambertson at F-17 and transported approximately 174 meters to the production target. This 'pbar production' mode required a lattice that would focus the proton beam to a small spot size on the target to maximize antiproton yield. The AP-1 line would also be reconfigured to operate at 8 GeV to support antiproton transfers and tuning cycles with protons. The AP-1 line is also connected to the Accumulator via AP-3, so the lattices of these beamlines needed to be compatible. After the Main Injector was built to replace the Main Ring, a beamline was required to connect it with the Antiproton Source. Designers chose to combine beam transfers of 150 GeV protons to the Tevatron, 120 GeV protons to AP-1, 120 GeV protons to Switchyard and 8 GeV proton tune-up or antiproton transfers via AP-1 into the P1 and P2 lines. The P2 line resides in the Main Ring tunnel enclosure between …
Date:
February 2, 2001
Creator:
Morgan, James
Object Type:
Report
System:
The UNT Digital Library
[Lally Family Videos, No. 27 - Lauren Wears a Sombrero]
This home movie excerpt documents Lauren Lindsey wearing a sombrero in front of a television.
Date:
July 2, 2001
Creator:
Lally
Object Type:
Video
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 106, No. 35, Ed. 1 Wednesday, May 2, 2001
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 2, 2001
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 119, No. 70, Ed. 1 Sunday, September 2, 2001
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
September 2, 2001
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 94, No. 92, Ed. 1 Sunday, September 2, 2001
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
September 2, 2001
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 95, No. 14, Ed. 1 Sunday, December 2, 2001
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 2, 2001
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 115, No. 31, Ed. 1 Thursday, August 2, 2001
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 2, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 94, No. 57, Ed. 1 Wednesday, May 2, 2001
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
May 2, 2001
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
An Investigation of Model Catalyzed Hydrocarbon Formation Reactions
Work was focused on two areas aimed at understanding the chemistry of realistic catalytic systems: (1) The synthesis and characterization of model supported olefin metathesis catalysts. (2) Understanding the role of the carbonaceous layer present on Pd(111) single crystal model catalysts during reaction.
Date:
May 2, 2001
Creator:
Tysoe, W. T.
Object Type:
Report
System:
The UNT Digital Library
Graviton emission from a soft brane
None
Date:
September 2, 2001
Creator:
Murayama, Hitoshi & Wells, James D.
Object Type:
Article
System:
The UNT Digital Library
Popular Berkeley Lab X-Ray Data Booklet Reissued
X-ray scientists and synchrotron-radiation users who have been patiently waiting for an updated version of the popular X-Ray Data Booklet last published in 1986 by the Center for X-Ray Optics at the Lawrence Berkeley National Laboratory can breathe a sigh of relief. The venerable ''little orange book'' has now been reissued under the auspices of CXRO and the Advanced Light Source (ALS) with an April printing of 10,000 paper copies and the posting of a Web edition at http://xdb.lbl.gov.
Date:
March 2, 2001
Creator:
Robinson, Art
Object Type:
Article
System:
The UNT Digital Library
Improved alternating gradient transport and focusing of neutral molecules
Polar molecules, in strong-field seeking states, can be transported and focused by an alternating sequence of electric field gradients that focus in one transverse direction while defocusing in the other. We show by calculation and numerical simulation, how one may greatly improve the alternating gradient transport and focusing of molecules. We use a new optimized multipole lens design, a FODO lattice beam transport line, and lenses to match the beam transport line to the beam source and the final focus. We derive analytic expressions for the potentials, fields, and gradients that may be used to design these lenses. We describe a simple lens optimization procedure and derive the equations of motion for tracking molecules through a beam transport line. As an example, we model a straight beamline that transports a 560 m/s jet-source beam of methyl fluoride molecules 15 m from its source and focuses it to 2 mm diameter. We calculate the beam transport line acceptance and transmission, for a beam with velocity spread, and estimate the transmitted intensity for specified source conditions. Possible applications are discussed.
Date:
December 2, 2001
Creator:
Kalnins, Juris; Lambertson, Glen & Gould, Harvey
Object Type:
Article
System:
The UNT Digital Library
Enhanced Geothermal System Development of the AmeriCulture Leasehold in the Animas Valley
Working under the grant with AmeriCulture, Inc., and its team of geothermal experts, assembled a plan to apply enhanced geothermal systems (EGS) techniques to increase both the temperature and flow rate of the geothermal waters on its leasehold. AmeriCulture operates a commercial aquaculture facility that will benefit from the larger quantities of thermal energy and low cost electric power that EGS technology can provide. The project brought together a team of specialists that, as a group, provided the full range of expertise required to successfully develop and implement the project.
Date:
March 2, 2001
Creator:
Duchane, David V.; Seawright, Gary L.; Sewright, Damon E.; Brown, Don; Witcher, James C. & Nichols, Kenneth E.
Object Type:
Report
System:
The UNT Digital Library
Threshold size for ambient metastability of rocksalt CdSe nanocrystals
None
Date:
October 2, 2001
Creator:
Jacobs, Keren; Wickham, Juanita & Alivisatos, A. Paul
Object Type:
Article
System:
The UNT Digital Library
Magnetically levitated space elevator to low-earth orbit.
The properties of currently available NbTi superconductor and carbon-fiber structural materials enable the possibility of constructing a magnetically levitated space elevator from the earth's surface up to an altitude of {approx} 200 km. The magnetic part of the elevator consists of a long loop of current-carrying NbTi, composed of one length that is attached to the earth's surface in an east-west direction and a levitated-arch portion. The critical current density of NbTi is sufficiently high that these conductors will stably levitate in the earth's magnetic field. The magnetic self-field from the loop increases the levitational force and for some geometries assists levitational stability. The 200-km maximum height of the levitated arch is limited by the allowable stresses of the structural material. The loop is cryogenically cooled with helium, and the system utilizes intermediate pumping and cooling stations along both the ground and the levitated portion of the loop, similar to other large terrestrial cryogenic systems. Mechanically suspended from the basic loop is an elevator structure, upon which mass can be moved between the earth's surface and the top of the loop by a linear electric motor or other mechanical or electrical means. At the top of the loop, vehicles may …
Date:
July 2, 2001
Creator:
Hull, J. R. & Mulcahy, T. M.
Object Type:
Article
System:
The UNT Digital Library
(De)Constructing dimensions
We construct renormalizable, asymptotically free, four dimensional gauge theories that dynamically generate a fifth dimension.
Date:
April 2, 2001
Creator:
Arkani-Hamed, Nima; Cohen, Andrew G. & Georgi, Howard
Object Type:
Article
System:
The UNT Digital Library
Distributed drift chamber design for rare particle detection in relativistic heavy ion collisions
This report describes a multi-plane drift chamber that was designed and constructed to function as a topological detector for the BNL AGSE896 rare particle experiment. The chamber was optimized for good spatial resolution, two track separation, and a high uniform efficiency while operating in a 1.6 Tesla magnetic field and subjected to long term exposure from a 11.6 GeV/nucleon beam of 10**6 Au ions per second.
Date:
October 2, 2001
Creator:
Bellwied, R.; Bennett, M. J.; Bernardo, V.; Caines, H.; Christie, W.; Costa, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Ion flux from vacuum arc cathode spots in the absence and presence of a magnetic field
Because plasma production at vacuum cathode spots is approximately proportional to the arc current, arc current modulation can be used to generate ion current modulation that can be detected far from the spot using a negatively biased ion collector. The drift time to the ion detector can used to determine kinetic ion energies. A very wide range of cathode materials have been used. It has been found that the kinetic ion energy is higher at the beginning of each discharge and approximately constant after 150 {micro}s. The kinetic energy is correlated with the arc voltage and the cohesive energy of the cathode material. The ion erosion rate has in inverse relation to the cohesive energy, enhancing the effect that the power input per plasma particle correlates with the cohesive energy of the cathode material. The influence of three magnetic field configurations on the kinetic energy has been investigated. Generally, a magnetic field increases the plasma impedance, arc burning voltage, and kinetic ion energy. However, if the plasma is produced in a region of low field strength and streaming into a region of higher field strength, the velocity may decrease due to the mirror effect. A magnetic field can increase the …
Date:
October 2, 2001
Creator:
Anders, Andre & Yushkov, George Yu.
Object Type:
Article
System:
The UNT Digital Library
Mechanism of fatigue in micron-scale films of polycrystalline silicon for microelectromechanical applications
Reported nearly a decade ago, cyclic fatigue failure in silicon thin films has remained a mystery. Silicon does not display the room temperature plasticity or extrinsic toughening mechanisms necessary to cause fatigue in either ductile (e.g., metals) or brittle (e.g., ceramics and ordered mintermetallic) materials.
Date:
August 2, 2001
Creator:
Muhlstein, C. L.; Stach, E. A. & Ritchie, R. O.
Object Type:
Article
System:
The UNT Digital Library
Commission on Affordable Housing and Health Facility Needs for Seniors in the 21st Century
Welcome to the official website of the Commission on Affordable Housing and Health Facility Needs for Seniors in the 21st Century. This Commission was created by Congress to report on the housing and health needs for the next generation of seniors and offer policy and legislative recommendations for enhancing services and increasing the available housing for this rapidly growing segment of our society.
Date:
January 2, 2001
Creator:
United States. Commission on Affordable Housing and Health Facility Needs for Seniors in the 21st Century.
Object Type:
Website
System:
The UNT Digital Library
Mechanical property testing of irradiated zircaloy cladding under reactor transient conditions.
Specimen geometries have been developed to determine the mechanical properties of irradiated Zircaloy cladding subjected to the mechanical conditions and temperatures associated with reactivity-initiated accidents (RIA) and loss-of-coolant accidents (LOCA). Miniature ring-stretch specimens were designed to induce both uniaxial and plane-strain states of stress in the transverse (hoop) direction of the cladding. Also, longitudinal tube specimens were also designed to determine the constitutive properties in the axial direction. Finite-element analysis (FEA) and experimental parameters and results were closely coupled to optimize an accurate determination of the stress-strain response and to induce fracture behavior representative of accident conditions. To determine the constitutive properties, a procedure was utilized to transform measured values of load and displacement to a stress-strain response under complex loading states. Additionally, methods have been developed to measure true plastic strains in the gauge section and the initiation of failure using real-time data analysis software. Strain rates and heating conditions have been selected based on their relevance to the mechanical response and temperatures of the cladding during the accidents.
Date:
October 2, 2001
Creator:
Daum, R. S.; Majumdar, S.; Tsai, H.; Bray, T. S.; Billone, M. C.; Koss, D. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Cooperative Research and Development Agreement Final Report for Cooperative Research and Development Agreement Number ORNL93-0237 Adhesive Bonding Technologies for Automotive Structural Composites
In 1993, the Oak Ridge National Laboratory (ORNL) entered into a Cooperative Research and Development Agreement (CRADA) with the Automotive Composites Consortium (ACC) to conduct research and development that would overcome technological hurdles to the adhesive bonding of current and future automotive materials. This effort is part of a larger Department of Energy (DOE) program to promote the use of lighter weight materials in automotive structures for the purpose of increasing fuel efficiency and reducing environmental pollutant emissions. In accomplishing this mission, the bonding of similar and dissimilar materials was identified as being of primary importance to the automotive industry since this enabling technology would give designers the freedom to choose from an expanded menu of low mass materials for component weight reduction. The research undertaken under this CRADA addresses the following areas of importance: bulk material characterization, structural fracture mechanics, modeling/characterization, process control and nondestructive evaluation (PC/NDE), manufacturing demonstration, and advanced processing. For the bulk material characterization task, the individual material properties of the adherends and adhesives were characterized. This included generating a database of mechanical and physical properties, after identifying and developing standard test methods to obtain properties. The structural fracture mechanics task concentrated on test development to …
Date:
May 2, 2001
Creator:
Boeman, R. G.
Object Type:
Report
System:
The UNT Digital Library
Programming with MPI on clusters.
The authors discuss the current state of development for the key aspects of MPI programming on clusters. These aspects are the evolution of the MPI Standard itself, developments in cluster hardware and system software that directly affect MPI implementations, and supporting software that facilitates the use of MPI on scalable clusters. In each case we give a brief background and summarize the current status.
Date:
August 2, 2001
Creator:
Lusk, E.
Object Type:
Article
System:
The UNT Digital Library