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Gravitational Instability of a Nonrotating Galaxy
Gravitational instability of the distribution of stars in a galaxy is a well-known phenomenon in astrophysics. This work is a preliminary attempt to analyze this phenomenon using the standard tools developed in accelerator physics. By applying this analysis, it is found that a stable nonrotating galaxy would become unstable if its size exceeds a certain limit that depends on its mass density.
Date:
December 14, 2005
Creator:
Chao, Alexander W.
Object Type:
Article
System:
The UNT Digital Library
Valve.
Patent for "new and useful Improvements in Valves" (lines 5-6) used in pneumatic inner tubes to stop leakage, including illustrations.
Date:
December 14, 1920
Creator:
Cheek, Alex L.
Object Type:
Patent
System:
The Portal to Texas History
Lightweight Aluminum/Nano composites for Automotive Drive Train Applications
During Phase I, we successfully processed air atomized aluminum powders via Dynamic Magnetic Compaction (DMC) pressing and subsequent sintering to produce parts with properties similar to wrought aluminum. We have also showed for the first time that aluminum powders can be processed without lubes via press and sintering to 100 % density. This will preclude a delube cycle in sintering and promote environmentally friendly P/M processing. Processing aluminum powders via press and sintering with minimum shrinkage will enable net shape fabrication. Aluminum powders processed via a conventional powder metallurgy process produce too large a shrinkage. Because of this, sinter parts have to be machined into specific net shape. This results in increased scrap and cost. Fully sintered aluminum alloy under this Phase I project has shown good particle-to-particle bonding and mechanical properties. We have also shown the feasibility of preparing nano composite powders and processing via pressing and sintering. This was accomplished by dispersing nano silicon carbide (SiC) powders into aluminum matrix comprising micron-sized powders (<100 microns) using a proprietary process. These composite powders of Al with nano SiC were processed using DMC press and sinter process to sinter density of 85-90%. The process optimization along with sintering needs to …
Date:
December 14, 2012
Creator:
Chelluri, Bhanumathi; Knoth, Edward A. & Schumaker, Edward J.
Object Type:
Report
System:
The UNT Digital Library
Environmental Energy Technologies Division Newsletter, Fall 2007,Vol.4, No. 4)
This issue's special focus is on advanced lithium ionbatteries for hybrid electric vehicle applications. The four articlesaddressing this area explore the modeling of lithium ion batterychemistries; the use of advanced diagnostic methods to study the physicsand chemistry of battery materials; a laboratory for advanced batterytesting; and approaches for improving battery safety. EETD's research isfunded by the Department of Energy's BATT (Batteries for AdvancedTransportation Technologies) program, FreedomCar and Vehicle TechnologiesProgram.
Date:
December 14, 2007
Creator:
Chen, Allan (Editor)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Detection of Laser Optic Defects Using Gradient Direction Matching
That National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL) will be the world's largest and most energetic laser. It has thousands of optics and depends heavily on the quality and performance of these optics. Over the past several years, we have developed the NIF Optics Inspection Analysis System that automatically finds defects in a specific optic by analyzing images taken of that optic. This paper describes a new and complementary approach for the automatic detection of defects based on detecting the diffraction ring patterns in downstream optic images caused by defects in upstream optics. Our approach applies a robust pattern matching algorithm for images called Gradient Direction Matching (GDM). GDM compares the gradient directions (the direction of flow from dark to light) of pixels in a test image to those of a specified model and identifies regions in the test image whose gradient directions are most in line with those of the specified model. For finding rings, we use luminance disk models whose pixels have gradient directions all pointing toward the center of the disk. After GDM identifies potential rings locations, we rank these rings by how well they fit the theoretical diffraction ring pattern equation. We perform …
Date:
December 14, 2005
Creator:
Chen, B Y; Kegelmeyer, L M; Liebman, J A; Salmon, J T; Tzeng, J & Paglieroni, D W
Object Type:
Article
System:
The UNT Digital Library
Computation of Detection Efficiencies for NMIS Fast Plastic Scintillators Using a Thick Detector Model
This report describes and compares the computation of the detection efficiencies for fast plastic scintillating detectors from their Time-of-Flight (TOF) spectrums using two different detector models. In the first method which assumes a thin detector model, a one-to-one correspondence between the energy of the neutron and the time bin in which it appears in the TOF spectrum is used in computing the detector efficiencies. In the second method which is based upon a thick detector model, the macroscopic cross sections of the detector materials are used to determine the path length of a neutron in the detector and hence its time of detection. With this model, neutrons of a given energy E{sub n}, are distributed across several time bins in the TOF spectrum.
Date:
December 14, 2000
Creator:
Chiang, L. G.
Object Type:
Report
System:
The UNT Digital Library
Reactivity accounting by ``CALHOT``, a one-group one-dimensional buckling code
Normal Pile exposure variations and day-to-day operating reactivity adjustments must be compensated by a combination of in-reactor poison and enrichment. The calculation of current reactivity status and the prediction of future trends is an integral part of the Physicist`s responsibility. This document describes the computer program ``CALHOT,`` which is based upon one-group diffusion theory, and is intended to be used in routine reactivity-enrichment calculations. It offers the advantages over present hand calculations of greater accuracy, more flexibility, and, most important, much less calculational time.
Date:
December 14, 1962
Creator:
Chitwood, R. A. & Toyooka, R. T.
Object Type:
Report
System:
The UNT Digital Library
Type Delivery Machine
Patent for a type delivery machine that separates different characters of type from one another.
Date:
December 14, 1915
Creator:
Choate, King E.
Object Type:
Patent
System:
The Portal to Texas History
Criticality Safety Analysis on the Mixed Be, Nat-U, and C (Graphite) Reflectors in 55-Gallon Waste Drums and Their Equivalents for HWM Applications
The objective of this analysis is to develop and establish the technical basis on the criticality safety controls for the storage of mixed beryllium (Be), natural uranium (Nat-U), and carbon (C)/graphite reflectors in 55-gallon waste containers and/or their equivalents in Hazardous Waste Management (HWM) facilities. Based on the criticality safety limits and controls outlined in Section 3.0, the operations involving the use of mixed-reflector drums satisfy the double-contingency principle as required by DOE Order 420.1 and are therefore criticality safe. The mixed-reflector mass limit is 120 grams for each 55-gallon drum or its equivalent. a reflector waiver of 50 grams is allowed for Be, Nat-U, or C/graphite combined. The waived reflectors may be excluded from the reflector mass calculations when determining if a drum is compliant. The mixed-reflector drums are allowed to mix with the typical 55-gallon one-reflector drums with a Pu mass limit of 120 grams. The fissile mass limit for the mixed-reflector container is 65 grams of Pu equivalent each. The corresponding reflector mass limits are 300 grams of Be, and/or 100 kilograms of Nat-U, and/or 110 kilograms of C/graphite for each container. All other unaffected control parameters for the one-reflector containers remain in effect for the mixed-reflector …
Date:
December 14, 2011
Creator:
Chou, P
Object Type:
Report
System:
The UNT Digital Library
Criticality Safety Controls for 55-Gallon Drums with a Mass Limit of 200 grams Pu-239
The following 200-gram Pu drum criticality safety controls are applicable to RHWM drum storage operations: (1) Mass (Fissile/Pu) - each 55-gallon drum or its equivalent shall be limited to 200 gram Pu or Pu equivalent; (2) Moderation - Hydrogen materials with a hydrogen density greater than that (0.133 g H/cc) of polyethylene and paraffin are not allowed and hydrogen materials with a hydrogen density no greater than that of polyethylene and paraffin are allowed with unlimited amounts; (3) Interaction - a spacing of 30-inches (76 cm) is required between arrays and 200-gram Pu drums shall be placed in arrays for 200-gram Pu drums only (no mingling of 200-gram Pu drums with other drums not meeting the drum controls associated with the 200-gram limit); (4) Reflection - no beryllium and carbon/graphite (other than the 50-gram waiver amount) is allowed, (note that Nat-U exceeding the waiver amount is allowed when its U-235 content is included in the fissile mass limit of 200 grams); and (5) Geometry - drum geometry, only 55-gallon drum or its equivalent shall be used and array geometry, 55-gallon drums are allowed for 2-high stacking. Steel waste boxes may be stacked 3-high if constraint.
Date:
December 14, 2011
Creator:
Chou, P
Object Type:
Report
System:
The UNT Digital Library
Criticality Safety Evaluations on the Use of 200-gram Pu Mass Limit for RHWM Waste Storage Operations
This work establishes the criticality safety technical basis to increase the fissile mass limit from 120 grams to 200 grams for Type A 55-gallon drums and their equivalents. Current RHWM fissile mass limit is 120 grams Pu for Type A 55-gallon containers and their equivalent. In order to increase the Type A 55-gallon drum limit to 200 grams, a few additional criticality safety control requirements are needed on moderators, reflectors, and array controls to ensure that the 200-gram Pu drums remain criticality safe with inadvertent criticality remains incredible. The purpose of this work is to analyze the use of 200-gram Pu drum mass limit for waste storage operations in Radioactive and Hazardous Waste Management (RHWM) Facilities. In this evaluation, the criticality safety controls associated with the 200-gram Pu drums are established for the RHWM waste storage operations. With the implementation of these criticality safety controls, the 200-gram Pu waste drum storage operations are demonstrated to be criticality safe and meet the double-contingency-principle requirement per DOE O 420.1.
Date:
December 14, 2011
Creator:
Chou, P
Object Type:
Report
System:
The UNT Digital Library
Laser-Compton Scattering as a Potential Electron Beam Monitor
LCS experiments were carried out at the Idaho Accelerator Center (IAC); sharp monochromatic x-ray lines were observed. These are produced using the so-called inverse Compton effect, whereby optical laser photons are collided with a relativistic electron beam. The back-scattered photons are then kinematically boosted to keV x-ray energies. We have first demonstrated these beams using a 20 MeV electron beam collided with a 100 MW, 7 ns Nd; YAG laser. We observed narrow LCS x-ray spectral peaks resulting from the interaction of the electron beam with the Nd; YAG laser second harmonic (532 nm). The LCS x-ray energy lines and energy deviations were measured as a function of the electron beam energy and enery-spread respectively. The results showed good agreement with the predicted valves. LCS could provide an exellent probe of electron beam energy, energy spread, transverse and longitudinal distribution and direction.
Date:
December 14, 2002
Creator:
Chouffani, K.; Wells, D.; Harmon, F.; Lancaster, G. & Jones, J.
Object Type:
Article
System:
The UNT Digital Library
National Alliance of Clean Energy Incubator Activities - Final Technical Report
Summary of activity related to development of the Alliance of Clean Energy Business Incubators and incubation services provided to the clean energy sector by the Advanced Technology Development Center at the Georgia Institute of Technology.
Date:
December 14, 2004
Creator:
Chris Downing, P.E.
Object Type:
Report
System:
The UNT Digital Library
Summary of Working Group 3a: Low Emittance Sources
We summarize the main issues and conclusions of the working group devoted to low emittance sources.
Date:
December 14, 2005
Creator:
Clendenin, J.; Lewellen, J. W.; Masuda, K. & Stephan, F.
Object Type:
Article
System:
The UNT Digital Library
Nozzle
Patent for improved head component to nozzles used for spraying liquid paint remover, steam, sand, and other such substances.
Date:
December 14, 1920
Creator:
Cleveland, David P.
Object Type:
Patent
System:
The Portal to Texas History
Red Bluff Water Treatment Plant Project Annual Budget: 2012
Annual budget and setting rates adopted by the Coastal Water Authority, for the Red Bluff Water Treatment Plant. it includes resolutions passed by the board of directors, budget summaries, and other related documentation.
Date:
December 14, 2011
Creator:
Coastal Water Authority (Tex.)
Object Type:
Report
System:
The Portal to Texas History
Utility and performance relative to consumer product energy efficiency standards. Final technical report
An investigation of the relative utility and performance of nine major household consumer products covered by the Energy Policy and Conservation Act is summarized. The objective was to define the terms utility and performance, to recommend methods for quantifying these two concepts, and to recommend an approach for dealing with utility and performance issues in the energy efficiency standards program. The definitions developed are: performance of a consumer product is the objective measure of how well, with the expected level of consumer input (following the manufacturer's instructions for installation and operation), the product does its intended job; and utility of a consumer product is a subjective measure, based on the consumer's perception, of the capability of the product to satisfy human needs. Quantification is based on test procedures and consumer survey methods which are largely already in use by industry. Utility and performance issues are important in product classification for prescribing energy efficiency standards. The recommended approach to utility and performance issues and classification is: prior to setting standards, evaluate utility and performance issues in the most quantitative way allowed by resources and schedules in order to develop classification guidelines. This approach requires no changes in existing Department of Energy …
Date:
December 14, 1979
Creator:
Coggins, J.L.
Object Type:
Report
System:
The UNT Digital Library
Revised Pulsar Spindown
We address the issue of electromagnetic pulsar spindown by combining our experience from the two limiting idealized cases which have been studied in great extent in the past: that of an aligned rotator where ideal MHD conditions apply, and that of a misaligned rotator in vacuum. We construct a spindown formula that takes into account the misalignment of the magnetic and rotation axes, and the magnetospheric particle acceleration gaps. We show that near the death line aligned rotators spin down much slower than orthogonal ones. In order to test this approach, we use a simple Monte Carlo method to simulate the evolution of pulsars and find a good fit to the observed pulsar distribution in the P-{dot P} diagram without invoking magnetic field decay. Our model may also account for individual pulsars spinning down with braking index n < 3, by allowing the corotating part of the magnetosphere to end inside the light cylinder. We discuss the role of magnetic reconnection in determining the pulsar braking index. We show, however, that n {approx} 3 remains a good approximation for the pulsar population as a whole. Moreover, we predict that pulsars near the death line have braking index values n > …
Date:
December 14, 2005
Creator:
Contopoulos, Ioannis; Academy, /Athens; Spitkovsky, Anatoly & /KIPAC, Menlo Park
Object Type:
Article
System:
The UNT Digital Library
A preliminary investigation of the use of circulation control to increase the lift of a 45 degree sweptback wing by suction through trailing-edge slots
Report presenting an investigation to determine the effectiveness of circulation control by applying suction through trailing-edge slots on a 45 degree sweptback wing. Various chordwise extents and depths of slot were investigated with and without deflection of a trailing-edge split flap. Results regarding the correlation of two-dimensional-section results with Ehlers' theory, effectiveness of circulation control on a sweptback wing, effect of slot configuration on circulation control, effect of trailing-edge split flap on circulation control, effect of circulation control on pitching moment, and circulation control at angle of attack are provided.
Date:
December 14, 1954
Creator:
Cook, Woodrow L.; Griffin, Roy N., Jr. & Hickey, David H.
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:
December 14, 2001
Creator:
Copson, Raymond W.
Object Type:
Report
System:
The UNT Digital Library
Detection of Substituted PAH Residues by SPME in Arson Debris
None
Date:
December 14, 2005
Creator:
Cornett, C. & Wermeling, J.
Object Type:
Report
System:
The UNT Digital Library
Three-dimensional Dielectric Photonic Crystal Structures for Laser-driven Acceleration
We present the design and simulation of a three-dimensional photonic crystal waveguide for linear laser-driven acceleration in vacuum. The structure confines a synchronous speed-of-light accelerating mode in both transverse dimensions. We report the properties of this mode, including sustainable gradient and optical-to-beam efficiency. We present a novel method for confining a particle beam using optical fields as focusing elements. This technique, combined with careful structure design, is shown to have a large dynamic aperture and minimal emittance growth, even over millions of optical wavelengths.
Date:
December 14, 2007
Creator:
Cowan, Benjamin M. & /Tech-X, Boulder /SLAC
Object Type:
Article
System:
The UNT Digital Library
Surgical Splint
Patent for a surgical splint, which is semi-rigid so that the instrument is rigid enough to maintain its shape and tension, but with a construction that includes softer materials like rubber so that it can be adjusted without causing pain or discomfort. Patent includes illustrations.
Date:
December 14, 1920
Creator:
Crawford, Lyter H. & Prante, John H.
Object Type:
Patent
System:
The Portal to Texas History
Peanut Planter
Patent for a peanut planter utilizing a belt and pulley system.
Date:
December 14, 1915
Creator:
Crider, Julius Washington
Object Type:
Patent
System:
The Portal to Texas History