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1,873 Matching Results
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Upper bounds on lepton-number violating processes
None
Date:
February 1, 2005
Creator:
Atre, Anupama; Barger, Vernon; /Wisconsin U., Madison; Han, Tao & /Wisconsin U., Madison /Fermilab /Argonne
Object Type:
Article
System:
The UNT Digital Library
3rd Tech DeltaSphere-3000 Laser 3D Scene Digitizer infrared laser scanner hazard analysis.
A laser hazard analysis and safety assessment was performed for the 3rd Tech model DeltaSphere-3000{reg_sign} Laser 3D Scene Digitizer, infrared laser scanner model based on the 2000 version of the American National Standard Institute's Standard Z136.1, for the Safe Use of Lasers. The portable scanner system is used in the Robotic Manufacturing Science and Engineering Laboratory (RMSEL). This scanning system had been proposed to be a demonstrator for a new application. The manufacture lists the Nominal Ocular Hazard Distance (NOHD) as less than 2 meters. It was necessary that SNL validate this NOHD prior to its use as a demonstrator involving the general public. A formal laser hazard analysis is presented for the typical mode of operation for the current configuration as well as a possible modified mode and alternative configuration.
Date:
February 1, 2005
Creator:
Augustoni, Arnold L.
Object Type:
Report
System:
The UNT Digital Library
PLUTONIUM FINISHING PLANT (PFP) GENERALIZED GEOMETRY HOLDUP CALCULATIONS & TOTAL MEASUREMENT UNCERTAINTY
A collimated portable gamma-ray detector will be used to quantify the plutonium content of items that can be approximated as a point, line, or area geometry with respect to the detector. These items can include ducts, piping, glove boxes, isolated equipment inside of gloveboxes, and HEPA filters. The Generalized Geometry Holdup (GGH) model is used for the reduction of counting data. This document specifies the calculations to reduce counting data into contained plutonium and the associated total measurement uncertainty.
Date:
February 1, 2005
Creator:
BD, KEELE
Object Type:
Report
System:
The UNT Digital Library
Joint Institute for Nanoscience Annual Report 2004
Due to the inherently interdisciplinary nature of nanoscience and nanotechnology, research in this arena is often significantly enhanced through creative cooperative activities. The Joint Institute for Nanoscience (JIN) is a venture of the University of Washington (UW) and Pacific Northwest National Laboratory (PNNL) to encourage and enhance high impact and high quality nanoscience and nanotechnology research that leverages the strengths and capabilities of both institutions, and to facilitate education in these areas. This report summarizes JIN award activities that took place during fiscal year 2004 and provides a historical list of JIN awardees, their resulting publications, and JIN-related meetings. Major portions of the JIN efforts and resources are dedicated to funding graduate students and postdoctoral research associates to perform research in collaborations jointly directed by PNNL staff scientists and UW professors. JIN fellowships are awarded on the basis of applications that include research proposals. They have been very successful in expanding collaborations between PNNL and UW, which have led to many excellent joint publications and presentations and enhanced the competitiveness of both institutions for external grant funding. JIN-based interactions are playing a significant role in creating new research directions and reshaping existing research programs at both the UW and PNNL. …
Date:
February 1, 2005
Creator:
Baer, Donald R. & Campbell, Charles
Object Type:
Report
System:
The UNT Digital Library
Data Evaluation for 56Co epsilon + beta+ Decay
Recommended values for nuclear and atomic data pertaining to the {var_epsilon} + {beta}{sup +} decay of {sup 56}Co are provided here, followed by comments on evaluation procedures and a summary of all available experimental data. {sup 56}Co is a radionuclide which is potentially very useful for Ge detector efficiency calibration because it is readily produced via the {sup 56}Fe(p,n) reaction, its half-life of 77.24 days is conveniently long, and it provides a number of relatively strong {gamma} rays with energies up to {approx}3500 keV. The transition intensities recommended here for the strongest lines will be included in the forthcoming International Atomic Energy Agency Coordinated Research Programme document ''Update of X- and Gamma-ray Decay Data Standards for Detector Calibration and Other Applications'', and the analysis for all transitions along with relevant atomic data have been provided to the Decay Data Evaluation Project.
Date:
February 28, 2005
Creator:
Baglin, Coral M. & MacMahon, T. Desmond
Object Type:
Report
System:
The UNT Digital Library
Radiological Scoping Survey of the Scotia Depot Scotia, New York
At the request of the Defense Logistics Agency, the Oak Ridge Institute for Science and Education conducted radiological scoping surveys of the Scotia Depot during the period of September 24 through 27, 2007. The scoping survey included visual inspections and limited radiological surveys performed in accordance with area classification that included surface scans, total and removable activity measurements, and soil sampling.
Date:
February 5, 2005
Creator:
Bailey, E. N.
Object Type:
Report
System:
The UNT Digital Library
Oxidation Resistance of Ru-Capped EUV Multilayers
Differently prepared Ru-capping layers, deposited on Mo/Si EUV multilayers, have been characterized using a suite of metrologies to establish their baseline structural, optical, and surface properties in as-deposited state. Same capping layer structures were tested for their thermal stability and oxidation resistance. Post-mortem characterization identified changes due to accelerated tests. The best performing Ru-capping layer structure was studied in detail with transmission electron microscopy to identify the grain microstructure and texture. This information is essential for modeling and performance optimization of EUVL multilayers.
Date:
February 23, 2005
Creator:
Bajt, S.; Dai, Z.; Nelson, E. J.; Wall, M. A.; Alameda, J.; Nguyen, N. et al.
Object Type:
Article
System:
The UNT Digital Library
Development of a Fast Microfluidic Mixer for Studies of Protein Folding KineticsFinal Report Cover Page
We designed and fabricated mixing devices that will help us elucidate the mechanisms of protein folding through measurements of folding reaction rates. These devices can be used in studying of other biological systems and are compatible with various spectroscopic observation methods. The project involved development of fabrication processes and setup of a laboratory for assembly and characterization of microfluidic devices, as well as measurements of protein folding kinetics. We produced three variants of the mixer: (1) The ultra fast mixer for Foerster Resonance Energy Transfer measurements (described by Anal. Chem. Article UCRL-JRNL-206676) and MicroTAS Conference Proceedings article (UCRL-JC-153057 ) included in the report; (2) The ultra fast mixer for UV measurements (described by the poster presented at MicroTAS conference (UCRL-POST-207476) included in the report); and (3) The mixer for single molecule measurements (described by the Science article UCRL-JC-153057) included in the report. In these mixers, the channels are narrow, ranging from a few to hundreds of {micro}m, so that the flow is laminar and all of the mixing is achieved through diffusion. Our goal is to develop robust microfluidic mixer with at least 100 times lower consumption rate, shorter dead time and time resolution than commercially available mixers that would …
Date:
February 10, 2005
Creator:
Bakajin, O
Object Type:
Report
System:
The UNT Digital Library
Least-Squares Wave-Front Reconstruction of Shack-Hartmann Sensors and Shearing Interferometers using Multigrid Techniques
None
Date:
February 8, 2005
Creator:
Baker, K L
Object Type:
Article
System:
The UNT Digital Library
Multi-century Changes to Global Climate and Carbon Cycle: Results from a Coupled Climate and Carbon Cycle Model
In this paper, we use a coupled climate and carbon cycle model to investigate the global climate and carbon cycle changes out to year 2300 that would occur if CO{sub 2} emissions from all the currently estimated fossil fuel resources were released to the atmosphere. By year 2300, the global climate warms by about 8 K and atmospheric CO{sub 2} reaches 1423 ppmv. The warming is higher than anticipated because the sensitivity to radiative forcing increases as the simulation progresses. In our simulation, the rate of emissions peak at over 30 PgC yr{sup -1} early in the 22nd century. Even at year 2300, nearly 50% of cumulative emissions remain in the atmosphere. In our simulations both soils and living biomass are net carbon sinks throughout the simulation. Despite having relatively low climate sensitivity and strong carbon uptake by the land biosphere, our model projections suggest severe long-term consequences for global climate if all the fossil-fuel carbon is ultimately released to the atmosphere.
Date:
February 17, 2005
Creator:
Bala, G.; Caldeira, K.; Mirin, A.; Wickett, M. & Delire, C.
Object Type:
Article
System:
The UNT Digital Library
Strategic Petroleum Reserve
This report includes information regarding strategic petroleum reserve. Background, purchases of crude oil, and drawdown capability are among topics discussed in this report.
Date:
February 28, 2005
Creator:
Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
Eye safe short range standoff aerosol cloud finder.
Because many solid objects, both stationary and mobile, will be present in an indoor environment, the design of an indoor aerosol cloud finding lidar (light detection and ranging) instrument presents a number of challenges. The cloud finder must be able to discriminate between these solid objects and aerosol clouds as small as 1-meter in depth in order to probe suspect clouds. While a near IR ({approx}1.5-{micro}m) laser is desirable for eye-safety, aerosol scattering cross sections are significantly lower in the near-IR than at visible or W wavelengths. The receiver must deal with a large dynamic range since the backscatter from solid object will be orders of magnitude larger than for aerosol clouds. Fast electronics with significant noise contributions will be required to obtain the necessary temporal resolution. We have developed a laboratory instrument to detect aerosol clouds in the presence of solid objects. In parallel, we have developed a lidar performance model for performing trade studies. Careful attention was paid to component details so that results obtained in this study could be applied towards the development of a practical instrument. The amplitude and temporal shape of the signal return are analyzed for discrimination of aerosol clouds in an indoor environment. …
Date:
February 1, 2005
Creator:
Bambha, Ray P.; Schroder, Kevin L. & Reichardt, Thomas A.
Object Type:
Report
System:
The UNT Digital Library
Oxygen Transport Ceramic Membranes
The present quarterly report describes some of the investigations on the structural properties of dense OTM bars provided by Praxair and studies on newer composition of Ti doped LSF. Thermogravimetric analysis (TGA) was carried out on La{sub 0.2}Sr{sub 0.8}Fe{sub 0.55}Ti{sub 0.45}O{sub 3-{delta}} to investigate oxygen deficiency ({delta}) of the sample. The TGA was performed in a controlled atmosphere using oxygen, argon, carbon monoxide and carbon dioxide with adjustable gas flow rates. In this experiment, the weight loss and gain of La{sub 0.2}Sr{sub 0.8}Fe{sub 0.55}Ti{sub 0.45}O{sub 3-{delta}} was directly measured by TGA. The weight change of the sample was evaluated at between 600 and 1250 C in air or 1000 C as a function of oxygen partial pressure. The oxygen deficiencies calculated from TGA data as a function of oxygen activity and temperature will be estimated and compared with that from neutron diffraction measurement in air. The LSFT and LSFT/CGO membranes were fabricated from the powder obtained from Praxair Specialty Ceramics. The sintered membranes were subjected to microstructure analysis and hardness analysis. The LSFT membrane is composed of fine grains with two kinds of grain morphology. The grain size distribution was characterized using image analysis. In LSFT/CGO membrane a lot of …
Date:
February 1, 2005
Creator:
Bandopadhyay, S.; Nagabhushana, N.; Nithyanantham, T.; Zhou, X.-D; Sin, Y-W.; Anderson, H.U. et al.
Object Type:
Report
System:
The UNT Digital Library
Oxygen Transport Ceramic Membranes
The present quarterly report describes some of the investigations on the structural properties of dense OTM bars provided by Praxair and studies on newer composition of Ti doped LSF. The in situ electrical conductivity and Seebeck coefficient measurements were made on LSFT at 1000 and 1200 C over the oxygen activity range from air to 10{sup -15} atm. The electrical conductivity measurements exhibited a p to n type transition at an oxygen activity of 1 x 10{sup -10} at 1000 C and 1 x 10{sup -6} at 1200 C. Thermogravimetric studies were also carried out over the same oxygen activities and temperatures. Based on the results of these measurements, the chemical and mechanical stability range of LSFT were determined and defect structure was established. The studies on the fracture toughness of the LSFT and dual phase membranes exposed to air and N{sub 2} at 1000 C was done and the XRD and SEM analysis of the specimens were carried out to understand the structural and microstructural changes. The membranes that are exposed to high temperatures at an inert and a reactive atmosphere undergo many structural and chemical changes which affect the mechanical properties. A complete transformation of fracture behavior was …
Date:
February 1, 2005
Creator:
Bandopadhyay, S.; Nithyanantham, T.; Zhou, X.-D; Sin, Y-W.; Anderson, H.U.; Jacobson, Alan et al.
Object Type:
Report
System:
The UNT Digital Library
Laser Safety Inspection Criteria
A responsibility of the Laser Safety Officer (LSO) is to perform laser safety audits. The American National Standard Z136.1 Safe use of Lasers references this requirement in several sections: (1) Section 1.3.2 LSO Specific Responsibilities states under Hazard Evaluation, ''The LSO shall be responsible for hazards evaluation of laser work areas''; (2) Section 1.3.2.8, Safety Features Audits, ''The LSO shall ensure that the safety features of the laser installation facilities and laser equipment are audited periodically to assure proper operation''; and (3) Appendix D, under Survey and Inspections, it states, ''the LSO will survey by inspection, as considered necessary, all areas where laser equipment is used''. Therefore, for facilities using Class 3B and or Class 4 lasers, audits for laser safety compliance are expected to be conducted. The composition, frequency and rigueur of that inspection/audit rests in the hands of the LSO. A common practice for institutions is to develop laser audit checklists or survey forms. In many institutions, a sole Laser Safety Officer (LSO) or a number of Deputy LSO's perform these audits. For that matter, there are institutions that request users to perform a self-assessment audit. Many items on the common audit list and the associated findings are …
Date:
February 11, 2005
Creator:
Barat, K.
Object Type:
Article
System:
The UNT Digital Library
Lessons Learned Class
Basic laser safety training at Lawrence Livermore National Laboratory (LLNL) is provided through a multiple module web-based course. The web-based course presents a wide and detailed review of laser safety topics including: biological effects, laser protective eyewear, fiber optic laser use, control measures, and more. It opens with a re-enactment of a laser accident. While supportive of this web-based course and actively involved in its development, the NIF Directorate has developed a classroom presentation adjunct to the course for laser users working in NIF. This author considers the LLNL web-based laser safety course to be one of, if not the best, such course available. Still, experience has shown that a ''lessons learned program'' is a great re-enforcer of laser safety. What-is-more, the laser lessons learned class provides important ''face-to-face'' interactions and discussion. The object of the ''laser lessons learned course'' is not to repeat the web course but present laser related lessons learned to the staff. In this author's opinion, lessons learned is the strongest safety re-enforcement one can present to the laser user community. For example, it can show how a practice that might be common to laser users can lead to a dramatic injury and a programmatic long-term …
Date:
February 11, 2005
Creator:
Barat, K.
Object Type:
Article
System:
The UNT Digital Library
Model Results Of The Draining Of Tank 25 Interstial Liquid
SRNL was tasked to simulate the draining of interstitial liquid from Tank 25 saltcake which is scheduled to take place in 2005. The salt processing plan baseline identifies a target of 135,000 gallons of interstitial liquid to be removed from Tank 25. Due to the uncertainty of the Tank 25 material properties and conditions, several cases were modeled varying the saltcake and interstitial liquid properties. The cases present a wide range of performance. The nominal baseline, case 1, removed the 135,000 gallons in approximately 1,030 hours of pump operation. The cases with optimal drain characteristics (high intrinsic permeability, high temp.) drain the 135,000 gallons in less time. Those with less favorable drain conditions did not approach the 135,000 gallons in a reasonable amount of time. Common to all cases unable to achieve the target volume was the low temperature at which they were run, 30 C (the lowest modeled), though there were additional contributing factors. A summary of the results are shown in Table 1.
Date:
February 14, 2005
Creator:
Barnes, C. D. & Flach, G. P.
Object Type:
Report
System:
The UNT Digital Library
Ab Initio Large-Basis No-Core Shell Model
We discuss the motivation, theory, and formulation of the ab initio No-Core Shell Model (NCSM). In this method the effective Hamiltonians are derived microscopically from realistic nucleon-nucleon (NN) and theoretical three-nucleon (NNN) potentials, as a function of the finite harmonic-oscillator (HO) basis space. We present converged results for the A = 3 and 4 nucleon systems, which are in agreement with results obtained by other exact methods, followed by results for p-shell nuclei. Binding energies, rms radii, excitation spectra, and electromagnetic properties are discussed.The favorable comparison with available data is a consequence of the underlying NN and NNN interactions rather than a phenomenological fit.
Date:
February 11, 2005
Creator:
Barrett, B R; Navratil, P; Nogga, A; Ormand, W E; Stetcu, I; Vary, J P et al.
Object Type:
Article
System:
The UNT Digital Library
Neutron Transmission and Capture Measurements and Resonance Parameter Analysis of Neodymium from 1eV to 500 eV
None
Date:
February 11, 2005
Creator:
Barry, DP; Trbovich, MJ; Danon, Y; Block, RC & Slovacek, RE
Object Type:
Article
System:
The UNT Digital Library
[Email Correspondence from Diane Bartels to Eleanor Brown, February 21, 2005]
Email from Diane Bartels to Eleanor Brown that has a list of WASP.
Date:
February 2005
Creator:
Bartels, Diane R.
Object Type:
Letter
System:
The Portal to Texas History
Knowledge Representation Issues in Semantic Graphs for Relationship Detection
An important task for Homeland Security is the prediction of threat vulnerabilities, such as through the detection of relationships between seemingly disjoint entities. A structure used for this task is a ''semantic graph'', also known as a ''relational data graph'' or an ''attributed relational graph''. These graphs encode relationships as typed links between a pair of typed nodes. Indeed, semantic graphs are very similar to semantic networks used in AI. The node and link types are related through an ontology graph (also known as a schema). Furthermore, each node has a set of attributes associated with it (e.g., ''age'' may be an attribute of a node of type ''person''). Unfortunately, the selection of types and attributes for both nodes and links depends on human expertise and is somewhat subjective and even arbitrary. This subjectiveness introduces biases into any algorithm that operates on semantic graphs. Here, we raise some knowledge representation issues for semantic graphs and provide some possible solutions using recently developed ideas in the field of complex networks. In particular, we use the concept of transitivity to evaluate the relevance of individual links in the semantic graph for detecting relationships. We also propose new statistical measures for semantic graphs …
Date:
February 2, 2005
Creator:
Barthelemy, M; Chow, E & Eliassi-Rad, T
Object Type:
Article
System:
The UNT Digital Library
FIND: Fluorescence Imaging in the Nuclear Domain
This document examines the potential use of Thomson-Radiated Extreme X-ray (T-REX) sources for Fluorescence Imaging in the Nuclear Domain (FIND) of special nuclear materials. A back-of-the-envelope, relative comparison of T-REX sources vs. Bremsstrahlung sources for this application is presented. It is estimated that use of T-REX for FIND could be as much as 5 x 10{sup 12} more effective than the use of anode based sources. Furthermore it is estimated that illumination of samples of dimension 1 cm on a side could produce up to {approx}10{sup 9} detectable photons per second.
Date:
February 14, 2005
Creator:
Barty, C J
Object Type:
Report
System:
The UNT Digital Library
Measurement of cross sections for the Cu-63(alpha,gamma)Ga-67 reaction from 5.9-8.7 MeV
None
Date:
February 24, 2005
Creator:
Basunia, M. S.; Norman, E. B.; Shugart, H. A.; Smith, A. R.; Dolinski, M. J. & Quiter, B. J.
Object Type:
Article
System:
The UNT Digital Library
Characteristics and sources of intermediate size particles in recovery boilers : final project report.
As part of the U.S. Department of Energy (DOE) Office of Industrial Technologies (OIT) Industries of the Future (IOF) Forest Products research program, a collaborative investigation was conducted on the sources, characteristics, and deposition of particles intermediate in size between submicron fume and carryover in recovery boilers. Laboratory experiments on suspended-drop combustion of black liquor and on black liquor char bed combustion demonstrated that both processes generate intermediate size particles (ISP), amounting to 0.5-2% of the black liquor dry solids mass (BLS). Measurements in two U.S. recovery boilers show variable loadings of ISP in the upper furnace, typically between 0.6-3 g/Nm{sup 3}, or 0.3-1.5% of BLS. The measurements show that the ISP mass size distribution increases with size from 5-100 {micro}m, implying that a substantial amount of ISP inertially deposits on steam tubes. ISP particles are depleted in potassium, chlorine, and sulfur relative to the fuel composition. Comprehensive boiler modeling demonstrates that ISP concentrations are substantially overpredicted when using a previously developed algorithm for ISP generation. Equilibrium calculations suggest that alkali carbonate decomposition occurs at intermediate heights in the furnace and may lead to partial destruction of ISP particles formed lower in the furnace. ISP deposition is predicted to occur …
Date:
February 1, 2005
Creator:
Baxter, Larry L. (Brigham Young University, Provo, UT); Shaddix, Christopher R.; Verrill, Christopher L. (Georgia Institute of Technology, Institute of Paper Science and Technology, Atlanta, GA) & Wessel, Richard A. (Babcock & Wilcox Company, Barberton, OH)
Object Type:
Report
System:
The UNT Digital Library