Partner
Oklahoma Historical Society
239
UNT Libraries Government Documents Department
226
UNT Libraries
223
Livingston Municipal Library
74
Sterling Municipal Library
56
Abilene Christian University Library
39
Nellie Pederson Civic Library
37
Sammy Brown Library
37
Swisher County Library
29
Archer Public Library
26
63 More
Collection
Texas Digital Newspaper Program
772
Tocker Foundation Grant
388
Oklahoma Digital Newspaper Program
252
Office of Scientific & Technical Information Technical Reports
161
The Greensheet
147
Polk County Newspapers
74
Abilene Library Consortium
60
The Baytown Sun
55
Chickasha Newspaper Collection
55
Sapulpa Herald
54
110 More
Degree Department
College of Music
5
Department of Counseling, Development and Higher Education
5
Department of Psychology
4
Department of Teacher Education and Administration
4
Department of Computer Science and Engineering
3
School of Visual Arts
3
Department of English
2
Department of Geography
2
Center for Advanced Scientific Computing and Modeling
1
Chemistry
1
11 More
Degree Discipline
Degree Level
Country
Year
Month
Language
1,345 Matching Results
Results open in a new window/tab. Unexpected Results? Search the Catalog Instead.
Results:
1 - 24 of
1,345
next
Notes on the Injection of EBIS Ions into Booster
N/A
Date:
June 1, 2006
Creator:
Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Evidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon
The Sivers mechanism for the single-spin asymmetry in unpolarized lepton scattering from a transversely polarized nucleon is driven by the orbital angular momentum carried by its quark and gluon constituents, combined with QCD final-state interactions. Both quark and gluon mechanisms can generate such a single-spin asymmetry, though only the quark mechanism can explain the small single-spin asymmetry measured by the COMPASS collaboration on the deuteron, suggesting the gluon mechanism is small relative to the quark mechanism. We detail empirical studies through which the gluon and quark orbital angular momentum contributions, quark-flavor by quark-flavor, can be elucidated.
Date:
August 23, 2006
Creator:
Brodsky, S. J. & Gardner, S.
Object Type:
Article
System:
The UNT Digital Library
Search for W-prime boson production in the top quark decay channel
We present a search for the production of a new heavy gauge boson W' that decays to a top quark and a bottom quark. We have analyzed 230 pb{sup -1} of data collected with the D0 detector at the Fermilab Tevatron collider at a center-of-mass energy of 1.96 TeV. No significant excess of events is found in any region of the final state invariant mass distribution. We set upper limits on the production cross section of W bosons at the 95% confidence level for several different W' boson masses. We exclude masses below 610 GeV for a W' boson with standard-model-like couplings, below 630 GeV for a W' boson with right-handed couplings that is allowed to decay to both leptons and quarks, and below 670 GeV for a W' boson with right-handed couplings that is only allowed to decay to quarks.
Date:
July 1, 2006
Creator:
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.
Object Type:
Article
System:
The UNT Digital Library
An indirect measurement of the width of the w boson at the D0 experiment
This thesis presents an indirect measurement of the width of the W boson using data collected at the D0 experiment, a multipurpose particle detector utilizing the Fermilab Tevatron. The W width was determined from the ratio of W {yields} {mu}{nu} to Z {yields} {mu}{sup +}{mu}{sup -} cross sections to be {Gamma}{sub W} = 2168 {+-} 22(stat) {+-} 62(syst){sub -16}{sup +24}(pdf) {+-} 4(other) MeV, in good agreement with the Standard Model prediction and other experimental measurements. In addition there is a description of how work made towards this measurement has been used to improve the parameterized detector simulation, a vital tool in the obtention of physics results from signals observed in the detector, and in estimating the uncertainty due to choice of PDF, which is of interest for all measurements made at hadron colliders.
Date:
August 1, 2006
Creator:
Telford, Paul
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Measurement of the W boson helicity in top quark decay at D0
The authors present a measurement of the fraction f{sub +} of right-handed W bosons produced in top quark decays, based on a candidate sample of t{bar t} events in the {ell}+jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb{sup -1} collected by the D0 detector at the Fermilab Tevatron p{bar p} Collider at {radical}s = 1.96 TeV. They reconstruct the decay angle {theta}* for each lepton. By comparing the cos{theta}* distribution from the data with those for the expected background and signal for various values of f{sub +}, they find f{sub +} = 0.056 {+-} 0.080(stat) {+-} 0.057(syst). (f{sub +} < 0.23 at 95% C.L.), consistent with the standard model prediction of f{sub +} = 3.6 x 10{sup -4}.
Date:
September 1, 2006
Creator:
Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T. et al.
Object Type:
Article
System:
The UNT Digital Library
HAMMER COURSEWARE MANAGEMENT SYSTEM (CMS) SYSTEM DEVELOPMENT AND IMPLEMENTATION
HAMMER Courseware Management System (HAMMERCMS) is the official name of the system Fluor Hanford, Inc., uses to facilitate development of, deliver, and track training presented in some electronic form (mainly, web-based training) to Hanford Site employees, subcontractors, and vendors.
Date:
April 28, 2006
Creator:
GARDNER, P.R.
Object Type:
Article
System:
The UNT Digital Library
SUDOKU A STORY & A SOLVER
Sudoku, also known as Number Place, is a logic-based placement puzzle. The aim of the puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9 x 9 grid made up of 3 x 3 subgrids (called ''regions''), starting with various digits given in some cells (the ''givens''). Each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability. Although first published in a U.S. puzzle magazine in 1979, Sudoku initially caught on in Japan in 1986 and attained international popularity in 2005. Last fall, after noticing Sudoku puzzles in some newspapers and magazines, I attempted a few just to see how hard they were. Of course, the difficulties varied considerably. ''Obviously'' one could use Trial and Error but all the advice was to ''Use Logic''. Thinking to flex, and strengthen, those powers, I began to tackle the puzzles systematically. That is, when I discovered a new tactical rule, I would write it down, eventually generating a list of ten or so, with some having overlap. They served pretty well except for the more difficult puzzles, but even then I managed to develop an …
Date:
April 1, 2006
Creator:
GARDNER, P.R.
Object Type:
Article
System:
The UNT Digital Library
Prompt Gamma-Ray Neutron Activation Analysis (PGNAA) for Elemental Analysis
This research project was to improve the prompt gamma-ray neutron activation analysis (PGNAA) measurement approach for bulk analysis, oil well logging, and small sample thermal enutron bean applications.
Date:
April 11, 2006
Creator:
Gardner, Robin P.
Object Type:
Report
System:
The UNT Digital Library
Deep Ultrasound Enhancements Final Report
This study involves collaboration between Los Alamos National Laboratory and Lawrence Livermore National Laboratory to enhance and optimize LANL's ultrasonic inspection capabilities for production. Deep-penetrating ultrasonic testing enhancement studies will extend the current capabilities, which only look for disbonds. Current ultrasonic methods in production use 15-20 MHz to inspect for disbonds. The enhanced capabilities use 5 MHz to penetrate to the back surface and image the back surface for any flaws. The enhanced capabilities for back surface inspection use transducers and squirter modifications that can be incorporated into the existing production system. In a production setup the current 15-20 MHz transducer and squirter would perform a bond inspection, followed by a deep inspection that would be performed by simply swapping out the 5 MHz transducer and squirter. Surrogate samples were manufactured of beryllium and bismuth to perform the ultrasonic enhancement studies. The samples were used to simulate flaws on the back surface and study ultrasound's ability to image them. The ultrasonic technique was optimized by performing experiments with these samples and analyzing transducer performance in detecting flaws in the surrogate. Beam patterns were also studied experimentally using a steel ball reflector to measure beam patterns, focal points, and sensitivities to …
Date:
May 1, 2006
Creator:
Quarry, M.; Thomas, G.; Ward, W. & Gardner, D.
Object Type:
Report
System:
The UNT Digital Library
Design and Preliminary Monte Carlo Calculations of an Active Compton Suppressed LaBr3(Ce) Detector System for TRU Assay in Remote-Handled Wastes
Recent studies indicate LaBr3(Ce) scintillation detectors have desirable attributes, such as room temperature operability, which may make them viable alternatives as primary detectors (PD) in a Compton suppression spectrometer (CSS) used for remote-handled transuranic (RH-TRU) waste assay. A CSS with a LaBr3(Ce) PD has been designed and its expected performance evaluated using Monte Carlo analysis. The unique design of this unit minimizes the amount of "dead" material between the PD and the secondary guard detector. The analysis results indicate that this detector will have a relatively high Compton-suppression capability, with greater suppression ability for large angle-scattered photons in the PD. J. K. Hartwell1, M. E. McIlwain1, R. P. Gardner2, J. Kulisek3 1) Idaho National Laboratory, PO Box 1625, Idaho Falls, ID 83415-2114 USA 2) North Carolina State University, Dept of Nuclear Eng., PO Box 7909, Raleigh, NC 27695 USA 3) Ohio State University, Columbus, Ohio 43210 The US Department of Energy’s transuranic (TRU) waste inventory includes about 4,500 m3 of remote-handled TRU (RH-TRU) wastes. The RH-TRU waste stream is composed of a variety of containerized waste forms having a contact surface dose rate that exceeds 2 mSv/hr (200 mrem/hr) containing waste materials with a total TRU concentration greater than 3700 …
Date:
September 1, 2006
Creator:
Kulisek, J.; Hartwell, J. K.; McIlwain, M. E. & Gardner, R. P.
Object Type:
Article
System:
The UNT Digital Library
Discrete Symmetries on the Light Front and a General Relation connecting Nucleon Electric Dipole and Anomalous Magnetic Moments
We consider the electric dipole form factor, F{sub 3}(q{sup 2}), as well as the Dirac and Pauli form factors, F{sub 1}(q{sup 2}) and F{sub 2}(q{sup 2}), of the nucleon in the light-front formalism. We derive an exact formula for F{sub 3}(q{sup 2}) to complement those known for F{sub 1}(q{sup 2}) and F{sub 2}(q{sup 2}). We derive the light-front representation of the discrete symmetry transformations and show that time-reversal- and parity-odd effects are captured by phases in the light-front wave functions. We thus determine that the contributions to F{sub 2}(q{sup 2}) and F{sub 3}(q{sup 2}), Fock-state by Fock-state, are related, independent of the fundamental mechanism through which CP violation is generated. Our relation is not specific to the nucleon, but, rather, is true of spin-1/2 systems in general, be they lepton or baryon. The empirical values of the anomalous magnetic moments, in concert with empirical bounds on the associated electric dipole moments, can better constrain theories of CP violation. In particular, we find that the neutron and proton electric dipole moments echo the isospin structure of the anomalous magnetic moments, {kappa}{sup n} {approx} -{kappa}{sup p}.
Date:
January 11, 2006
Creator:
Brodsky, Stanley J.; Gardner, Susan & Hwang, Dae Sung
Object Type:
Article
System:
The UNT Digital Library
Measurements and Modeling of Eddy Current Effects in BNL's AGS Booster.
Recent beam experiments at BNL's AGS Booster have enabled us to study in more detail the effects of eddy currents on the lattice structure and our control over the betatron tune. The Booster is capable of operating at ramp rates as high as 9 T/sec. At these ramp rates eddy currents in the vacuum chambers significantly alter the fields and gradients seen by the beam as it is accelerated. The Booster was designed with these effects in mind and to help control the field uniformity and linearity in the Booster Dipoles special vacuum chambers were designed with current windings to negate the affect of the induced eddy currents. In this report results from betatron tune measurements and eddy current simulations will be presented. We will then present results from modeling the accelerator using the results of the magnetic field simulations and compare these to the measurements.
Date:
June 23, 2006
Creator:
Brown, K. A.; Ahrens, L.; Gardner, C.; Glenn, J. W.; Harvey, M.; Meng, W. et al.
Object Type:
Article
System:
The UNT Digital Library
[Clipping: J. D. Tippit follows in granddad's path]
Newspaper clipping discussing a police officer that Lee Harvey Oswald gunned down while the officer was searching for the killer who assassinated President John F. Kennedy. Officer Tippit's grandson, J. D. Tippit, is following in his grandfather's footsteps and becoming a police office. The article has red markings in pen.
Date:
March 27, 2006
Creator:
Kovach, Gretel C.
Object Type:
Clipping
System:
The UNT Digital Library
Virtual PCR
The polymerase chain reaction (PCR) stands among the keystone technologies for analysis of biological sequence data. PCR is used to amplify DNA, to generate many copies from as little as a single template. This is essential, for example, in processing forensic DNA samples, pathogen detection in clinical or biothreat surveillance applications, and medical genotyping for diagnosis and treatment of disease. It is used in virtually every laboratory doing molecular, cellular, genetic, ecologic, forensic, or medical research. Despite its ubiquity, we lack the precise predictive capability that would enable detailed optimization of PCR reaction dynamics. In this LDRD, we proposed to develop Virtual PCR (VPCR) software, a computational method to model the kinetic, thermodynamic, and biological processes of PCR reactions. Given a successful completion, these tools will allow us to predict both the sequences and concentrations of all species that are amplified during PCR. The ability to answer the following questions will allow us both to optimize the PCR process and interpret the PCR results: What products are amplified when sequence mixtures are present, containing multiple, closely related targets and multiplexed primers, which may hybridize with sequence mismatches? What are the effects of time, temperature, and DNA concentrations on the concentrations …
Date:
February 23, 2006
Creator:
Gardner, S N; Clague, D S; Vandersall, J A; Hon, G & Williams, P L
Object Type:
Report
System:
The UNT Digital Library
U.S. Circuit and District Court Nominations by President George W. Bush During the 107th-109th Congresses
None
Date:
May 24, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Guadalupe-Blanco River Authority of Texas Annual Financial Report: 2005
Annual financial report of the Guadalupe-Blanco River Authority of Texas documenting income, expenditures, and other relevant financial information for fiscal year ending August 31, 2005.
Date:
2006~
Creator:
Guadalupe-Blanco River Authority (Tex.)
Object Type:
Report
System:
The Portal to Texas History
Lattices for High-Power Proton Beam Acceleration and Secondary Beam Collection and Cooling.
Rapid cycling synchrotrons are used to accelerate high-intensity proton beams to energies of tens of GeV for secondary beam production. After primary beam collision with a target, the secondary beam can be collected, cooled, accelerated or decelerated by ancillary synchrotrons for various applications. In this paper, we first present a lattice for the main synchrotron. This lattice has: (a) flexible momentum compaction to avoid transition and to facilitate RF gymnastics (b) long straight sections for low-loss injection, extraction, and high-efficiency collimation (c) dispersion-free straights to avoid longitudinal-transverse coupling, and (d) momentum cleaning at locations of large dispersion with missing dipoles. Then, we present a lattice for a cooler ring for the secondary beam. The momentum compaction across half of this ring is near zero, while for the other half it is normal. Thus, bad mixing is minimized while good mixing is maintained for stochastic beam cooling.
Date:
June 23, 2006
Creator:
Wang, S.; Wei, J.; Brown, K.; Gardner, C.; Lee, Y. Y.; Lowenstein, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Acceleration of Polarized Protons in the AGS With Two Helical Partial Snakes.
Acceleration of polarized protons in the energy range of 5 to 25 GeV is particularly difficult: the depolarizing resonances are strong enough to cause significant depolarization but full Siberian snakes cause intolerably large orbit excursions and are not feasible in the AGS since straight sections are too short. Recently, two helical partial snakes with double pitch design have been built and installed in the AGS. With careful setup of optics at injection and along the ramp, this combination can eliminate the intrinsic and imperfection depolarizing resonances encountered during acceleration. This paper presents the accelerator setup and preliminary results.
Date:
June 26, 2006
Creator:
Huang, H.; Ahrens, L. A.; Bai, M.; Bravar, A.; Brown, K.; Courant, E. D. et al.
Object Type:
Article
System:
The UNT Digital Library
NSRL Energy Loss Calculator
N/A
Date:
August 1, 2006
Creator:
B., Vankuik; Gardner, C.; Bellavia, S.; Rusek, A. & Brown, K.
Object Type:
Report
System:
The UNT Digital Library
The dynamics of diluted Ho spin ice Ho2-xYxTi2O7 studied byneutron spin echo spectroscopy
We have studied the spin relaxation in diluted spin ice Ho{sub 2-x} Y{sub x} Ti{sub 2}O{sub 7} by means of neutron spin echo spectroscopy. Remarkably, the geometrical frustration is not relieved by doping with non-magnetic Y, and the dynamics of the freezing is unaltered in the spin echo time window up to x {approx_equal} 1.6. At higher doping with non-magnetic Y (x {ge} 1.6) a new relaxation process at relatively high temperature (up to at least T {approx_equal} 55 K) appears which is more than 10 times faster than the thermally activated main relaxation process. We find evidence that over the whole range of composition all Ho spins participate in the dynamics. These results are compared to a.c. susceptibility measurements of the diluted Ho and Dy spin ice systems. X-ray absorption fine structure (EXAFS) spectra and x-ray diffraction show that the samples are structurally well ordered.
Date:
February 27, 2006
Creator:
Ehlers, G.; Gardner, J. S.; Booth, C. H.; Daniel, M.; Kam, K. C.; Cheetham, A. K. et al.
Object Type:
Article
System:
The UNT Digital Library
Beam Energy Scaling of Ion-Induced Electron Yield from K+ Impact on Stainless Steel
Electron clouds limit the performance of many major accelerators and storage rings. Significant quantities of electrons result when halo ions are lost to beam tubes, generating gas which can be ionized and ion-induced electrons that can multiply and accumulate, causing degradation or loss of the ion beam. In order to understand the physical mechanisms of ion-induced electron production, experiments studied the impact of 50 to 400 keV K{sup +} ions on stainless steel surfaces near grazing incidence, using the 500 kV Ion Source Test Stand (STS-500) at LLNL. The experimental electron yield scales with the electronic component (dE{sub e}/dx) of the stopping power and its angular dependence does not follow l/cos({theta}). A theoretical model is developed, using TRIM code to evaluate dE{sub e}/dx at several depths in the target, to estimate the electron yield, which is compared with the experimental results. The experiment extends the range of energy from previous works and the model reproduces the angular dependence and magnitude of the electron yield.
Date:
March 6, 2006
Creator:
Covo, M K; Molvik, A; Friedman, A; Westenskow, G; Barnard, J J; Cohen, R et al.
Object Type:
Article
System:
The UNT Digital Library
Vadose Zone Hydrogeology Data Package for Hanford Assessments
This data package documents the technical basis for selecting physical and geochemical parameters and input values that will be used in vadose zone modeling for Hanford assessments. This work was originally conducted as part of the Characterization of Systems Task of the Groundwater Remediation Project managed by Fluor Hanford, Inc., Richland, Washington, and revised as part of the Characterization of Systems Project managed by the Pacific Northwest National Laboratory (PNNL) for the U.S. Department of Energy, Richland Operations Office (DOE-RL). This data package describes the geologic framework, the physical, hydrologic, and contaminant transport properties of the geologic materials, and deep drainage (i.e., recharge) estimates, and builds on the general framework developed for the initial assessment conducted using the System Assessment Capability (SAC) (Bryce et al. 2002). The general approach for this work was to update and provide incremental improvements over the previous SAC data package completed in 2001. As with the previous SAC data package, much of the data and interpreted information were extracted from existing documents and databases. Every attempt was made to provide traceability to the original source(s) of the data or interpretations.
Date:
June 1, 2006
Creator:
Last, George V.; Freeman, Eugene J.; Cantrell, Kirk J.; Fayer, Michael J.; Gee, Glendon W.; Nichols, William E. et al.
Object Type:
Report
System:
The UNT Digital Library
Fuel Cell Research at the University of South Carolina
Five projects are proposed, in an effort to supplement the efforts of fuel cell research at the University of South Carolina and to contribute to the Technical Plan for Fuel Cells of the Department of Energy. These efforts include significant interaction with the industrial community through DOE funded projects and through the National Science Foundation’s Industry/University Cooperative Research Center for Fuel Cells. The allocation of projects described below leverage all of these sources of funding without overlap and redundancy. The first project “Novel Non-Precious Metal Catalyst For PEMFCs,” (Dr. Branko Popov) continues DOE award DE-FC36-03GO13108 for which funding was delayed by DOE due to budget constraints. The purpose of this project is to develop an understanding of the feasibility and limitations of metal-free catalysts. The second project, “Non Carbon Supported Catalysts” (Dr. John Weidner), is focused on improved catalysts and seeks to develop novel materials, which are more corrosion resistant. This corrosion behavior is critical during transient operation and during start-up and shutdown. This second project will be leveraged with recent, peer-reviewed, supplemental funding from NSF for use in the National Science Foundation Industry/University Cooperative Research Center for Fuel Cells (CFC) at USC. The third project, “Hydrogen Quality,” (Dr. Jean …
Date:
September 25, 2006
Creator:
Van Zee, John W.
Object Type:
Report
System:
The UNT Digital Library
China Spallation Neutron Source Project: Design Iterations and R and D Status
The China Spallation Neutron Source (CSNS) is an accelerator based high power project currently under preparation in China. The accelerator complex is based on an H{sup -} linear accelerator and a rapid cycling proton synchrotron. During the past year, the design of most accelerator systems went through major iterations, and initial research and developments were started on the prototyping of several key components. This paper summarizes major activities of the past year.
Date:
September 21, 2006
Creator:
Wei, J.
Object Type:
Article
System:
The UNT Digital Library