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467 Matching Results
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Juvenile Justice Funding Trends
None
Date:
April 27, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Linac Coherent Light Source Electron Beam Collimation
This paper describes the design and simulation of the electron beam collimation system in the Linac Coherent Light Source (LCLS). Dark current is expected from the gun and some of the accelerating cavities. Particle tracking of the expected dark current through the entire LCLS linac, from gun through FEL undulator, is used to estimate final particle extent in the undulator as well as expected beam loss at each collimator or aperture restriction. A table of collimators and aperture restrictions is listed along with halo particle loss results, which includes an estimate of average continuous beam power lost. In addition, the transverse wakefield alignment tolerances are calculated for each collimator.
Date:
April 27, 2007
Creator:
Wu, J.; Dowell, D.; Emma, P.; Limborg-Deprey, C. & Schmerge, J. F.
Object Type:
Article
System:
The UNT Digital Library
Local Three-Nucleon Interaction from Chiral Effective Field Theory
None
Date:
April 27, 2007
Creator:
Navratil, P
Object Type:
Article
System:
The UNT Digital Library
Long Wave Infrared Detection of Chemical Weapons Simulants
The purpose of Task 3.b under PL02-OP211I-PD07 (CBW simulant detection) was to demonstrate the applicability of the sensor work developed under this project for chemical and biological weapons detection. To this end, the specific goal was to demonstrate the feasibility of detection of chemical agents via that of simulants (Freons) with similar spectroscopic features. This has been achieved using Freon-125 as a simulant, a tunable external cavity quantum cascade laser (ECQCL), and a Herriott cell-based sensor developed at Pacific Northwest National Laboratory (PNNL) specifically for this task. The experimentally obtained spectrum of this simulant matches that found in the Northwest Infrared (NWIR) spectral library extremely well, demonstrating the ability of this technique to detect the exact shape of this feature, which in turn indicates the ability to recognize the simulant even in the presence of significant interference. It has also been demonstrated that the detected features of a typical interferent, namely water, are so different in shape and width to the simulant, that they are easily recognized and separated from such a measurement. Judging from the signal-to-noise ratio (SNR) of the experimental data obtained, the noise equivalent absorption sensitivity is estimated to be 0.5 x 10-7 to 1 x 10-6 …
Date:
April 27, 2007
Creator:
Phillips, Mark C.; Taubman, Matthew S.; Scott, David C.; Myers, Tanya L.; Munley, John T. & Cannon, Bret D.
Object Type:
Report
System:
The UNT Digital Library
Low-Fidelity Cross Section Covariances for 219 Fission Products in the First Neutron Region.
An extensive set of covariances for neutron cross sections in the energy range 5 keV-20 MeV has been developed to provide initial, low-fidelity but consistent uncertainty data for nuclear criticality safety applications. The methodology for the determination of such covariances combines the nuclear reaction model code EMPIRE, which calculates sensitivity to nuclear reaction model parameters, and the Bayesian code KALMAN to propagate uncertainty of the model parameters to cross sections. Taking into account the large scale of the project (219 fission products), only partial reference to experimental data has been made. Therefore, the covariances are, to a large extent, derived from the perturbation of several critical model parameters selected through the sensitivity analysis. These parameters define optical potential, level densities and pre-equilibrium emission. This work represents the first attempt ever to generate nuclear data covariances on such a scale.
Date:
April 27, 2007
Creator:
Pigni, M. T.; Herman, M.; Oblozinsky, P. & Rochman, D.
Object Type:
Report
System:
The UNT Digital Library
Master's Recital: 2007-04-27 - Yoshiko Shamoto, piano
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Master of Music (MM) degree.
Date:
April 27, 2007
Creator:
Shamoto, Yoshiko
Object Type:
Sound
System:
The UNT Digital Library
Measuring the Repassivation Potential of Alloy 22 Using the Potentiodynamic - Galvanostatic - Potentiostatic Method
Traditionally, the susceptibility of Alloy 22 (N06022) to suffer crevice corrosion has been measured using the Cyclic Potentiodynamic Polarization (CPP) technique (ASTM G 61). When the alloy is not very susceptible to crevice corrosion, the values of repassivation potential obtained using the CPP technique are not highly reproducible. To circumvent the large uncertainty in the values of the repassivation potential by the CPP method, the repassivation potential of Alloy 22 may be measured using a slower method that combines sequentially potentiodynamic, galvanostatic and potentiostatic treatments (this method is called the Tsujikawa-Hisamatsu Electrochemical or THE method). In the THE method the anodic charge is applied to the specimen in a more controlled manner, which avoids driving the alloy to transpassivity and therefore results in more reproducible repassivation potential values. Results using THE method under various testing conditions are presented. A new standard has been prepared for ASTM balloting for the THE method. The round robin matrix results are also discussed.
Date:
April 27, 2007
Creator:
Evans, K J & Rebak, R B
Object Type:
Article
System:
The UNT Digital Library
MiniBooNE Neutrino Physics at the University of Alabama
This report summarizes the activities conducted by the UA group under the auspices of the DoE/EPSCoR grant number DE--FG02--04ER46112 since the date of the previous progress report, i.e., since November 2005. It also provides a final report of the accomplishments achieved during the entire period of this grant (February 2004 to January 2007). The grant has fully supported the work of Dr. Yong Liu (postdoctoral research assistant -- in residence at Fermilab) on the MiniBooNE reconstruction and particle identification (PID) algorithms.
Date:
April 27, 2007
Creator:
Stancu, Ion
Object Type:
Text
System:
The UNT Digital Library
Neutron Cross Section Covariances From Thermal Energy to 20 Mev.
We describe new method for energy-energy covariance calculation from the thermal energy up to 20 MeV. It is based on three powerful basic components: (i) Atlas of Neutron Resonances in the resonance region; (ii) the nuclear reaction model code EMPIRE in the unresolved resonance and fast neutron regions, and (iii) the Bayesian code KALMAN for correlations and error propagation. Examples for cross section uncertainties and correlations on {sup 90}Zr and {sup 193}Ir illustrate this approach in the resonance and fast neutron regions.
Date:
April 27, 2007
Creator:
Rochman, D.; Herman, M.; Oblozinsky, P.; Mughabghab, S. F.; Pigni, M. & Kawano, T.
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 91, No. 145, Ed. 1 Friday, April 27, 2007
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 27, 2007
Creator:
Savage, William W., III
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
OMEGA: A NEW COLD X-RAY SIMULATION FACILITY FOR THE EVALUATION OF OPTICAL COATINGS
We report on recent progress for the development of a new cold X-ray optical test capability using the Omega Facility located at the Laboratory for Laser Energetics (LLE) at the University of Rochester. These tests were done on the 30 kJ OMEGA laser at the Laboratory for Laser Energetics (LLE) at the University of Rochester, Rochester, NY. We conducted a six-shot series called OMEGA II on 14 July 2006 in one eight-hour day (supported by the Defense Threat Reduction Agency). The initial testing was performed using simple protected gold optical coatings on fused silica substrates. PUFFTFT analyses were completed and the specimen's thermal lateral stress and transverse stress conditions were calculated and interpreted. No major anomalies were detected. Comparison of the pre- and posttest reflective measurements coupled with the TFCALC analyses proved invaluable in guiding the analyses and interpreting the observed damage. The Omega facility is a high quality facility for performing evaluation of optical coatings and coupons and provides experience for the development of future National Ignition Facility (NIF) testing.
Date:
April 27, 2007
Creator:
Fisher, J. H.; Newlander, C. D.; Fournier, K. B.; Beutler, D. E.; Coverdale, C. A.; May, M. J. et al.
Object Type:
Article
System:
The UNT Digital Library
The Optimist (Abilene, Tex.), Vol. 95, No. 52, Ed. 1, Friday, April 27, 2007
Tri-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
April 27, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Oversight of Dual-Use Biological Research: The National Science Advisory Board for Biosecurity
None
Date:
April 27, 2007
Creator:
Shea, Dana A.
Object Type:
Report
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 115, No. 82, Ed. 1 Friday, April 27, 2007
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 27, 2007
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Polar-Orbiting Operational Environmental Satellites: Restructuring Is Under Way, but Technical Challenges and Risks Remain
A letter report issued by the Government Accountability Office with an abstract that begins "The National Polar-orbiting Operational Environmental Satellite System (NPOESS) is a tri-agency acquisition--managed by the Departments of Commerce and Defense and the National Aeronautics and Space Administration--which experienced escalating costs, schedule delays, and technical difficulties. These factors led to a June 2006 decision to restructure the program thereby decreasing the program's complexity, increasing its estimated cost to $12.5 billion, and delaying the first two satellites by 3 to 5 years. GAO was asked to (1) assess progress in restructuring the acquisition, (2) evaluate progress in establishing an effective management structure, (3) assess the reliability of the cost and schedule estimate, and (4) identify the status and key risks facing the program's major segments. To do so, GAO analyzed program and contractor data, attended program reviews, and interviewed program officials"
Date:
April 27, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Reductive dissolution and metal transport in lake coeur d alenesediments
The benthic sediments in Lake Coeur d Alene, northern Idaho,have been contaminated by metals (primarily Zn, Pb, and Cu) from decadesof upstream mining activities. As part of ongoing research on thebiogeo-chemical cycling of metals in this area, a diffusivereactive-transport model has been developed to simulate metal transportin the lake sediments. The model includes 1-D inorganic diffusivetransport coupled to a biotic reaction network with multiple terminalelectron acceptors under redox disequilibrium conditions. Here, the modelis applied to evaluate the competing effects of heavy-metal mobilizationthrough biotic reductive dissolution of Fe(III) (hydr)oxides, andimmobilization as biogenic sulfide minerals. Results indicate that therelative rates of Fe and sulfate reduction could play an important rolein metal transport through the envi-ronment, and that the formation of(bi)sulfide complexes could significantly enhance metal solubility, aswell as desorption from Fe hydroxides.
Date:
April 27, 2007
Creator:
Sengor, Sevinc.S.; Spycher, Nicolas F.; Ginn, Timothy R.; Moberly, James; Peyton, B. & Sani, Rajesh K.
Object Type:
Article
System:
The UNT Digital Library
[Refreshments after ceremony]
Photograph of attendees and inductees around refreshment table after the Sigma Tau Delta induction on April 27, 2007. Some are holding refreshments while others look at the Rare Books displays.
Date:
April 27, 2007
Creator:
Mears, Michelle M.
Object Type:
Photograph
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 92, No. 144, Ed. 1 Friday, April 27, 2007
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 27, 2007
Creator:
Mattox, Jami
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Scene: North Texas Daily (Denton, Tex.), Vol. 91, No. 106, Ed. 1 Friday, April 27, 2007
Weekly magazine edition of the daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
April 27, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
School and Campus Safety Programs and Requirements in the Elementary and Secondary Education Act and Higher Education Act
None
Date:
April 27, 2007
Creator:
Skinner, Rebecca R. & McCallion, Gail
Object Type:
Report
System:
The UNT Digital Library
Sea-Based Ballistic Missile Defense — Background and Issues for Congress
None
Date:
April 27, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Sealy News (Sealy, Tex.), Vol. 120, No. 34, Ed. 1 Friday, April 27, 2007
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
April 27, 2007
Creator:
Eddleman, Mike & Dang, Tracy
Object Type:
Newspaper
System:
The Portal to Texas History
[Seated Inductees]
Photograph of some inductees along the back row at the Sigma Tau Delta induction in April 2007. The induction ceremony was held on the fourth floor of Willis Library in the Rare Books Room.
Date:
April 27, 2007
Creator:
Mears, Michelle M.
Object Type:
Photograph
System:
The UNT Digital Library
Senior Recital: 2007-04-27 - Jeremiah Stones, bass trombone
Access:
Use of this item is restricted to the UNT Community
A senior recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Bachelor of Music (BM) degree
Date:
April 27, 2007
Creator:
Stones, Jeremiah
Object Type:
Sound
System:
The UNT Digital Library