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568 Matching Results
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Holographic Grand Unification
None
Date:
May 7, 2006
Creator:
Nomura, Yasunori; Poland, David & Tweedie, Brock
Object Type:
Article
System:
The UNT Digital Library
Lightest Isotope of Bh Produced Via the 209Bi(52Cr,n)260BhReaction
The lightest isotope of Bh known was produced in the new {sup 209}Bi({sup 52}Cr,n){sup 260}Bh reaction at the Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. Positive identification was made by observation of eight correlated alpha particle decay chains in the focal plane detector of the Berkeley Gas-Filled Separator. {sup 260}Bh decays with a 35{sub -9}{sup +19} ms half-life by alpha particle emission mainly by a group at 10.16 MeV. The measured cross section of 59{sub -20}{sup +29} pb is approximately a factor of four larger than compared to recent model predictions. The influences of the N = 152 and Z = 108 shells on alpha decay properties are discussed.
Date:
May 7, 2007
Creator:
Nelson, Sarah L.; Gregorich, Kenneth E.; Dragojevic, Irena; Garcia, Mitch A.; Gates, Jacklyn M.; Sudowe, Ralf et al.
Object Type:
Article
System:
The UNT Digital Library
Molecular Line Emission from Massive Protostellar Disks: Predictions for ALMA and the EVLA
We compute the molecular line emission of massive protostellar disks by solving the equation of radiative transfer through the cores and disks produced by the recent radiation-hydrodynamic simulations of Krumholz, Klein, & McKee. We find that in several representative lines the disks show brightness temperatures of hundreds of Kelvin over velocity channels {approx} 10 km s{sup -1} wide, extending over regions hundreds of AU in size. We process the computed intensities to model the performance of next-generation radio and submillimeter telescopes. Our calculations show that observations using facilities such as the EVLA and ALMA should be able to detect massive protostellar disks and measure their rotation curves, at least in the nearest massive star-forming regions. They should also detect significant sub-structure and non-axisymmetry in the disks, and in some cases may be able to detect star-disk velocity offsets of a few km s{sup -1}, both of which are the result of strong gravitational instability in massive disks. We use our simulations to explore the strengths and weaknesses of different observational techniques, and we also discuss how observations of massive protostellar disks may be used to distinguish between alternative models of massive star formation.
Date:
May 7, 2007
Creator:
Krumholz, M R; Klein, R I & McKee, C F
Object Type:
Article
System:
The UNT Digital Library
Final Technical Report on STTR Project DE-FG02-04ER86191 Hydrogen Cryostat for Muon Beam Cooling
The project was to develop cryostat designs that could be used for muon beam cooling channels where hydrogen would circulate through refrigerators and the beam-cooling channel to simultaneously refrigerate 1) high-temperature-superconductor (HTS) magnet coils, 2) cold copper RF cavities, and 3) the hydrogen that is heated by the muon beam. In an application where a large amount of hydrogen is naturally present because it is the optimum ionization cooling material, it was reasonable to explore its use with HTS magnets and cold, but not superconducting, RF cavities. In this project we developed computer programs for simulations and analysis and conducted experimental programs to examine the parameters and technological limitations of the materials and designs of Helical Cooling Channel (HCC) components (magnet conductor, RF cavities, absorber windows, heat transport, energy absorber, and refrigerant).The project showed that although a hydrogen cryostat is not the optimum solution for muon ionization cooling channels, the studies of the cooling channel components that define the cryostat requirements led to fundamental advances. In particular, two new lines of promising development were opened up, regarding very high field HTS magnets and the HS concept, that have led to new proposals and funded projects.
Date:
May 7, 2008
Creator:
Johnson, Rolland P.
Object Type:
Report
System:
The UNT Digital Library
Regulation of in situ to invasive breast carcinoma transition
The transition of ductal carcinoma in situ (DCIS) to invasive carcinoma is a key event in breast tumor progression that is poorly understood. Comparative molecular analysis of tumor epithelial cells from in situ and invasive tumors has failed to identify consistent tumor stage-specific differences. However, the myoepithelial cell layer, present only in DCIS, is a key distinguishing and diagnostic feature. To determine the contribution of non-epithelial cells to tumor progression, we analyzed the role of myoepithelial cells and fibroblasts in the progression of in situ carcinomas using a xenograft model of human DCIS. Progression to invasion was promoted by fibroblasts, but inhibited by normal myoepithelial cells. The invasive tumor cells from these progressed lesions formed DCIS rather than invasive cancers when re-injected into naive mice. Molecular profiles of myoepithelial and epithelial cells isolated from primary normal and cancerous human breast tissue samples corroborated findings obtained in the xenograft model. These results provide the proof of principle that breast tumor progression could occur in the absence of additional genetic alterations and that tumor growth and progression could be controlled by replacement of normal myoepithelial inhibitory signals.
Date:
May 7, 2008
Creator:
Polyak, Kornelia; Hu, Min; Yao, Jun; Carroll, Danielle K.; Weremowicz, Stanislawa; Chen, Haiyan et al.
Object Type:
Article
System:
The UNT Digital Library
Progress and Design Status of the ITER MSE Diagnostic
The Motional Stark Effect (MSE) diagnostic will be essential for the study of advanced scenarios on ITER and its design is currently underway. In order meet the ITER MSE diagnostic design requirements, two approaches for the measurement are under consideration. The first is based on standard polarimeter techniques to measure the polarization of the emitted light, whereas the second measures the Stark splitting from which |B| can be inferred, where |B| is the magnitude of the total magnetic field. The baseline design of the optical system is centered on the first approach. Emphasis in this case is placed on minimizing the polarization aberrations of the optical relay system. Motivation for the second method results from concern that the optical properties of the plasma-facing mirror, particularly its diattenuation and retardance, will degrade with plasma exposure. The second approach, while less sensitive to aberrations induced by plasma exposure effects, requires greater optical throughput in order to measure the complete Stark spectrum. We have developed optimized designs for both techniques and will present a comparison of them and discuss the associated design trade-offs.
Date:
May 7, 2008
Creator:
Makowski, M A; Allen, S L; Holcomb, C T; Lerner, S; Morris, K & Wong, N
Object Type:
Article
System:
The UNT Digital Library
TreeQ-VISTA: An Interactive Tree Visualization Tool with Functional Annotation Query Capabilities
Summary: We describe a general multiplatform exploratorytool called TreeQ-Vista, designed for presenting functional annotationsin a phylogenetic context. Traits, such as phenotypic and genomicproperties, are interactively queried from a relational database with auser-friendly interface which provides a set of tools for users with orwithout SQL knowledge. The query results are projected onto aphylogenetic tree and can be displayed in multiple color groups. A richset of browsing, grouping and query tools are provided to facilitatetrait exploration, comparison and analysis.Availability: The program,detailed tutorial and examples are available online athttp://genome-test.lbl.gov/vista/TreeQVista.
Date:
May 7, 2007
Creator:
Gu, Shengyin; Anderson, Iain; Kunin, Victor; Cipriano, Michael; Minovitsky, Simon; Weber, Gunther et al.
Object Type:
Article
System:
The UNT Digital Library
Surveillance of Site A and Plot M - Report for 2006.
The results of the environmental surveillance program conducted at Site A/Plot M in the Palos Forest Preserve area for Calendar Year 2006 are presented. Based on the results of the 1976-1978 radiological characterization of the site, a determination was made that a surveillance program be established. The characterization study determined that very low levels of hydrogen-3 (as tritiated water) had migrated from the burial ground and were present in two nearby hand-pumped picnic wells. The current surveillance program began in 1980 and consists of sample collection and analysis of surface and subsurface water. The results of the analyses are used to (1) monitor the migration pathway of water from the burial ground (PlotM) to the hand pumped picnic wells, (2) establish if buried radionuclides other than hydrogen-3 have migrated, and (3) monitor the presence of radioactive and chemically hazardous materials in the environment of the area. Hydrogen-3 in the Red GateWoods picnic wells was still detected this year, but the average and maximum concentrations were significantly less than found earlier. Hydrogen-3 continues to be detected in a number of wells, boreholes, dolomite holes, and a surface stream. Analyses since 1984 have indicated the presence of low levels of strontium-90 in …
Date:
May 7, 2007
Creator:
Golchert, N. W. & Oversight, ESH /QA
Object Type:
Report
System:
The UNT Digital Library
Verification of Gyrokinetic (delta)f Simulations of Electron Temperature Gradient Turbulence
The GEM gyrokinetic {delta}f simulation code [Chen, 2003] [Chen, 2007] is shown to reproduce electron temperature gradient turbulence at the benchmark operating point established in previous work [Nevins, 2006]. The electron thermal transport is within 10% of the expected value, while the turbulent fluctuation spectrum is shown to have the expected intensity and two-point correlation function.
Date:
May 7, 2007
Creator:
Nevins, W. M.; Parker, S. E.; Chen, Y.; Candy, J.; Dimits, A.; Dorland, W. et al.
Object Type:
Article
System:
The UNT Digital Library
The Zeta Potential of Surface-Functionalized Metallic Nanorod Particles in Aqueous Solution
Metallic nanoparticles suspended in aqueous solutions, and functionalized with chemical and biological surface coatings, are important elements in basic and applied nanoscience research. Many applications require an understanding of the electrokinetic or colloidal properties of such particles. In this paper we describe the results of experiments to measure the zeta potential of metallic nanorod particles in aqueous saline solutions, including the effects of pH, ionic strength, metallic composition, and surface functionalization state. Particle substrates tested include gold, silver, and palladium monometallic particles as well as gold/silver bimetallic particles. Surface functionalization conditions included 11-mercaptoundecanoic acid (MUA), mercaptoethanol (ME), and mercaptoethanesulfonic acid (MESA) self-assembled monolayers (SAMs), as well as MUA layers subsequently derivatized with proteins. Zeta potential data for typical charge-stabilized polystyrene particles are also presented for comparison. Experimental data are compared with theory. The results of these studies are useful in predicting and controlling the aggregation, adhesion, and transport of functionalized metallic nanoparticles within microfluidic devices and other systems.
Date:
May 7, 2007
Creator:
Dougherty, G M; Rose, K A; Tok, J B; Pannu, S S; Chuang, F S; Sha, M Y et al.
Object Type:
Article
System:
The UNT Digital Library
Target Diagnostic Instrument-Based Controls Framework for the National Ignition Facility
NIF target diagnostics are being developed to observe and measure the extreme physics of targets irradiated by the 192-beam laser. The response time of target materials can be on the order of 100ps--the time it takes light to travel 3 cm--temperatures more than 100 times hotter than the surface of the sun, and pressures that exceed 109 atmospheres. Optical and x-ray diagnostics were developed and fielded to observe and record the results of the first 4-beam experiments at NIF. Hard and soft x-ray spectra were measured, and time-integrated and gated x-ray images of hydrodynamics experiments were recorded. Optical diagnostics recorded backscatter from the target, and VISAR laser velocimetry measurements were taken of laser-shocked target surfaces. Additional diagnostics are being developed and commissioned to observe and diagnose ignition implosions, including various neutron and activation diagnostics. NIF's diagnostics are being developed at LLNL and with collaborators at other sites. To accommodate the growing number of target diagnostics, an Instrument-Based Controls hardware-software framework has been developed to facilitate development and ease integration into the NIF Integrated Computer Control System (ICCS). Individual WindowsXP PC controllers for each digitizer, power supply and camera (i.e., instruments) execute controls software unique to each instrument model. Each hardware-software …
Date:
May 7, 2007
Creator:
Shelton, R.; O'Brien, D.; Nelson, J. & Kamperschroer, J.
Object Type:
Article
System:
The UNT Digital Library
Improving the bulk data transfer experience
Scientific computations and collaborations increasingly rely on the network to provide high-speed data transfer, dissemination of results, access to instruments, support for computational steering, etc. The Energy Sciences Network is establishing a science data network to provide user driven bandwidth allocation. In a shared network environment, some reservations may not be granted due to the lack of available bandwidth on any single path. In many cases, the available bandwidth across multiple paths would be sufficient to grant the reservation. In this paper we investigate how to utilize the available bandwidth across multiple paths in the case of bulk data transfer.
Date:
May 7, 2008
Creator:
Guok, Chin; Guok, Chin; Lee, Jason R. & Berket, Karlo
Object Type:
Article
System:
The UNT Digital Library
MODEL 9975 SHIPPING PACKAGE FABRICATION PROBLEMS AND SOLUTIONS
The Model 9975 Shipping Package is the latest in a series (9965, 9968, etc.) of radioactive material shipping packages that have been the mainstay for shipping radioactive materials for several years. The double containment vessels are relatively simple designs using pipe and pipe cap in conjunction with the Chalfont closure to provide a leak-tight vessel. The fabrication appears simple in nature, but the history of fabrication tells us there are pitfalls in the different fabrication methods and sequences. This paper will review the problems that have arisen during fabrication and precautions that should be taken to meet specifications and tolerances. The problems and precautions can also be applied to the Models 9977 and 9978 Shipping Packages.
Date:
May 7, 2008
Creator:
May, C & Allen Smith, A
Object Type:
Article
System:
The UNT Digital Library
Developments toward a reliable diode-pumped hydrocarbon-free 795-nm rubidium laser
We report a 795-nm diode-pumpable Rb laser using a buffer gas of pure {sup 3}He. {sup 3}He gas enhances mixing of the Rb fine-structure levels. This enables efficient lasing at reduced He pressures and improved thermal management.
Date:
May 7, 2008
Creator:
Wu, S S; Soules, T F; Page, R H; Mitchell, S C; Kanz, V K & Beach, R J
Object Type:
Article
System:
The UNT Digital Library
Automobile-Indicator
Patent for an automobile indicator which shows the license number of the car and the state in which the license was issued. Illustrations included.
Date:
May 7, 1912
Creator:
Hoaker, John & Banks, William I.
Object Type:
Patent
System:
The Portal to Texas History
Acetylene-Gas Machine
Patent for a acetylene gas machine that automatically controls the flow of carbid or gas producing material into the generator "by means of a float and lever connection with the valve of the carbid hopper" (lines 19-21).
Date:
May 7, 1907
Creator:
Ricketts, James R.
Object Type:
Patent
System:
The Portal to Texas History
Automatic Gun or Rifle.
Patent for a gun or rifle with a magazine, which quickly and automatically ejects spent cartridges and reloads.
Date:
May 7, 1912
Creator:
Douglas, William M.
Object Type:
Patent
System:
The Portal to Texas History
Planter
Patent for a single row planter for corn or cotton. The planter is to be used in virgin soil with out any soil preparation.
Date:
May 7, 1907
Creator:
Dudley, Thomas J.
Object Type:
Patent
System:
The Portal to Texas History
Apparatus for Solidifying Cotton-Batting Preparatory for Pressing and Baling
Patent for an apparatus for forming cotton batting into dense rolls to prepare them for bailing and pressing. Illustrations included.
Date:
May 7, 1912
Creator:
Banister, Charles
Object Type:
Patent
System:
The Portal to Texas History
Cement.
Patent for cement that is better or equivalent to Keene's cement from England, made from pure gypsum and various chemicals and only calcinated once.
Date:
May 7, 1907
Creator:
Jones, Thomas
Object Type:
Patent
System:
The Portal to Texas History
Combination Key and Automatic Stop Cock
Patent for "new and improved Combination Key and Automatic Stop-Cock" (lines 6-7) for the purpose of providing "an automatic arrangement for cutting off the water-supply in hydrants and like appliances when the weather becomes so cold as to endanger the freezing of the water" (lines 11-14).
Date:
May 7, 1900
Creator:
Randall, C. T.
Object Type:
Patent
System:
The Portal to Texas History
Combined Lister Plow and Planter.
Patent for a combined Lister plow and planter that both breaks the ground and plants seed. Appears to be a type of early tractor.
Date:
May 7, 1907
Creator:
Dudley, Thomas J.
Object Type:
Patent
System:
The Portal to Texas History
Buckle
Patent for "a fastening device for securely holding the meeting ends of straps together, and is particularly applicable to stirrup-straps, in which, because of the strain thereon, the ordinary fastener is quickly broken or the strap is torn from the same" (lines 9-15).
Date:
May 7, 1901
Creator:
Stulting, John C. & Wiseman, William E.
Object Type:
Patent
System:
The Portal to Texas History
Axle-Setting Machine
Patent for a axle setting machine that can be used on any type of axle, has its own lever, and doesn't touch the inside of the axle collar.
Date:
May 7, 1907
Creator:
Roberts, John William
Object Type:
Patent
System:
The Portal to Texas History