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1,223 Matching Results
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Study of the D0 ---> K+ K- pi+ pi-
Using data from the FOCUS (E831) experiment at Fermilab, the authors present a new measurement for the Cabibbo-suppressed decay mode D{sup 0} {yields} K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}. They measure: {Lambda}(D{sup 0} {yields} K{sup +}K{sup -}{pi}{sup +}{pi}{sup -})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup -}{pi}{sup +}{pi}{sup +}) = 0.0295 {+-} 0.0011 {+-} 0.0008. An amplitude analysis has been performed in order to determine the resonant substructure of this decay mode. The dominant components are the decays D{sup 0} {yields} K{sub 1}(1270){sup +} K{sup -}, D{sup 0} {yields} K{sub 1}(1400){sup +}K{sup -} and D{sup 0} {yields} {rho}(770){sup 0}{phi}(1020).
Date:
November 1, 2004
Creator:
Link, J. M.; Yager, P. M.; /UC, Davis; Anjos, J. C.; Bediaga, I.; Gobel, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the doubly Cabibbo suppressed decay D0 ---> K+ pi- and a search for charm mixing
The authors present an analysis of the decay D{sup 0} {yields} K{sup +}{pi}{sup -} based on FOCUS data. From a sample of 234 signal events, they find a branching ratio of {Lambda}(D{sup 0} {yields} K{sup +}{pi}{sup -})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}) = (0.429{sub -0.061}{sup +0-.063} {+-} 0.027)% under the assumptions of no mixing and no CP violation. Allowing for CP violation, the find a branching ratio of (0.435{sub -0.061}{sup +0.063} {+-} 0.028)% and a CP asymmetry of 0.178{sub -0.141}{sup +0.144} {+-} 0.041. The branching ratio for the case of mixing with no CP violation is (0.381{sub -0.163}{sup +0.167} {+-} 0.092)%. They also present limits on charm mixing.
Date:
December 1, 2004
Creator:
Link, J. M.; Yager, P. M.; /UC, Davis; Anjos, J. C.; Bediaga, I.; Gobel, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Xyce Parallel Electronic Simulator : users' guide, version 2.0.
This manual describes the use of the Xyce Parallel Electronic Simulator. Xyce has been designed as a SPICE-compatible, high-performance analog circuit simulator capable of simulating electrical circuits at a variety of abstraction levels. Primarily, Xyce has been written to support the simulation needs of the Sandia National Laboratories electrical designers. This development has focused on improving capability the current state-of-the-art in the following areas: {sm_bullet} Capability to solve extremely large circuit problems by supporting large-scale parallel computing platforms (up to thousands of processors). Note that this includes support for most popular parallel and serial computers. {sm_bullet} Improved performance for all numerical kernels (e.g., time integrator, nonlinear and linear solvers) through state-of-the-art algorithms and novel techniques. {sm_bullet} Device models which are specifically tailored to meet Sandia's needs, including many radiation-aware devices. {sm_bullet} A client-server or multi-tiered operating model wherein the numerical kernel can operate independently of the graphical user interface (GUI). {sm_bullet} Object-oriented code design and implementation using modern coding practices that ensure that the Xyce Parallel Electronic Simulator will be maintainable and extensible far into the future. Xyce is a parallel code in the most general sense of the phrase - a message passing of computing platforms. These include serial, …
Date:
June 1, 2004
Creator:
Hoekstra, Robert John; Waters, Lon J.; Rankin, Eric Lamont; Fixel, Deborah A.; Russo, Thomas V.; Keiter, Eric Richard et al.
Object Type:
Report
System:
The UNT Digital Library
Xyce Parallel Electronic Simulator : reference guide, version 2.0.
This document is a reference guide to the Xyce Parallel Electronic Simulator, and is a companion document to the Xyce Users' Guide. The focus of this document is (to the extent possible) exhaustively list device parameters, solver options, parser options, and other usage details of Xyce. This document is not intended to be a tutorial. Users who are new to circuit simulation are better served by the Xyce Users' Guide.
Date:
June 1, 2004
Creator:
Hoekstra, Robert John; Waters, Lon J.; Rankin, Eric Lamont; Fixel, Deborah A.; Russo, Thomas V.; Keiter, Eric Richard et al.
Object Type:
Report
System:
The UNT Digital Library
Targeting a Novel Plasmodium falciparum Purine Recycling Pathway with Specific Immucillins
Plasmodium falciparum is unable to synthesize purine bases and relies upon purine salvage and purine recycling to meet its purine needs. We report that purines formed as products of the polyamine pathway are recycled in a novel pathway in which 5'-methylthioinosine is generated by adenosine deaminase. The action of P. falciparum purine nucleoside phosphorylase is a convergent step of purine salvage, converting both 5'-methylthioinosine and inosine to hypoxanthine. We used accelerator mass spectrometry to verify that 5'-methylthioinosine is an active nucleic acid precursor in P. falciparum. Prior studies have shown that inhibitors of purine salvage enzymes kill malaria, but potent malaria-specific inhibitors of these enzymes have not previously been described. 5'-methylthio-Immucillin-H, a transition state analogue inhibitor that is selective for malarial over human purine nucleoside phosphorylase, kills P. falciparum in culture. Immucillins are currently in clinical trials for other indications and may have application as antimalarials.
Date:
May 19, 2004
Creator:
Ting, L; Shi, W; Lewandowicz, A; Singh, V; Mwakingwe, A; Birck, M R et al.
Object Type:
Article
System:
The UNT Digital Library
The 9/11 Commission Report: Final Report of the National Commission on Terrorist Attacks Upon the United States
The official Government edition of the Final Report of the National Commission on Terrorist Attacks Upon the United States (also known as the 9-11 Commission, an independent, bipartisan commission created by congressional legislation and the signature of President George W. Bush in late 2002), provides a full and complete account of the circumstances surrounding the September 11, 2001 terrorist attacks, including preparedness for and the immediate response to the attacks. Provides recommendations designed to guard against future attacks.
Date:
July 22, 2004
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Book
System:
The UNT Digital Library
Case study for model validation : assessing a model for thermal decomposition of polyurethane foam.
A case study is reported to document the details of a validation process to assess the accuracy of a mathematical model to represent experiments involving thermal decomposition of polyurethane foam. The focus of the report is to work through a validation process. The process addresses the following activities. The intended application of mathematical model is discussed to better understand the pertinent parameter space. The parameter space of the validation experiments is mapped to the application parameter space. The mathematical models, computer code to solve the models and its (code) verification are presented. Experimental data from two activities are used to validate mathematical models. The first experiment assesses the chemistry model alone and the second experiment assesses the model of coupled chemistry, conduction, and enclosure radiation. The model results of both experimental activities are summarized and uncertainty of the model to represent each experimental activity is estimated. The comparison between the experiment data and model results is quantified with various metrics. After addressing these activities, an assessment of the process for the case study is given. Weaknesses in the process are discussed and lessons learned are summarized.
Date:
October 1, 2004
Creator:
Dowding, Kevin J.; Leslie, Ian H. (New Mexico State University, Las Cruces, NM); Hobbs, Michael L.; Rutherford, Brian Milne; Hills, Richard Guy (New Mexico State University, Las Cruces, NM) & Pilch, Martin M.
Object Type:
Report
System:
The UNT Digital Library
The Effects of Multicultural College Courses on Intercultural Experiences and Attitudes.
This study examined college undergraduates' intercultural experiences and attitudes at the beginning and the end of a semester-long course on multicultural issues. Participants were 290 undergraduate college students at the University of North Texas , 202 of whom were enrolled in one of the university's core global studies, cross-cultural, or diversity courses for the fall 2001 semester, and 88 of whom were enrolled in courses outside the core. It was hypothesized that the multicultural group's Positive Inventory of the Consequences of Multicultural Experiences scores would increase and Social Dominance Orientation Scale scores would decrease more than they would for the control group. Findings did not support these hypotheses.
Date:
December 2004
Creator:
Soule, Amy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Grassburr, Yearbook of Tarleton State University, 2004
Yearbook for Tarleton State University in Stephenville, Texas includes photos of and information about the school, student body, professors, and organizations. Index starts on page 204.
Date:
Spring 2004
Creator:
Tarleton State University
Object Type:
Yearbook
System:
The Portal to Texas History
First measurement of sigma (p anti-p ---> Z) . Br (Z ---> tau tau) at s**(1/2) = 1.96- TeV
The authors present a measurement of the cross section for Z production times the branching fraction to {tau} leptons, {sigma} {center_dot} Br(Z {yields} {tau}{sup +}{tau}{sup -}), in p{bar p} collisions at {radical}s = 1.96 TeV in the channel in which one {tau} decays into {mu}{nu}{sub {mu}}{nu}{sub {tau}}, and the other into hadrons + {nu}{sub {tau}} or e{nu}{sub e}{nu}{sub {tau}}. The data sample corresponds to an integrated luminosity of 226 pb{sup -1} collected with the D0 detector at the Fermilab Tevatron collider. The final sample contains 2008 candidate events with an estimated background of 55%. From this they obtain {sigma} {center_dot} Br(Z {yields} {tau}{sup +}{tau}{sup -}) = 237 {+-} 15(stat) {+-} 18(sys) {+-} 15(lum) pb, in agreement with the standard model prediction.
Date:
December 1, 2004
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
Search for first-generation scalar leptoquarks in p anti-p collisions at s**(1/2) = 1.96-TeV
The authors report on a search for pair production of first-generation scalar leptoquarks (LQ) in p{bar p} collisions at {radical}s = 1.96 TeV using an integrated luminosity of 252 pb{sup -1} collected at the Fermilab Tevatron collider by the D0 detector. They observe no evidence for LQ production in the topologies arising from LQ{ovr LQ} {yields} eqeq and LQ{ovr LQ} {yields} eqvq, and derive 95% C.L. lower limits on the LQ mass as a function of {beta}, where {beta} is the branching fraction for LQ {yields} eq. The limits are 241 and 218 GeV/c{sup 2} for {beta} = 1 and 0.5, respectively. These results are combined with those obtained by D0 at {radical}s = 1.8 TeV, which increases these LQ mass limits to 256 and 234 GeV/c{sup 2}.
Date:
December 1, 2004
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
Design-Load Basis for LANL Structures, Systems, and Components
This document supports the recommendations in the Los Alamos National Laboratory (LANL) Engineering Standard Manual (ESM), Chapter 5--Structural providing the basis for the loads, analysis procedures, and codes to be used in the ESM. It also provides the justification for eliminating the loads to be considered in design, and evidence that the design basis loads are appropriate and consistent with the graded approach required by the Department of Energy (DOE) Code of Federal Regulation Nuclear Safety Management, 10, Part 830. This document focuses on (1) the primary and secondary natural phenomena hazards listed in DOE-G-420.1-2, Appendix C, (2) additional loads not related to natural phenomena hazards, and (3) the design loads on structures during construction.
Date:
September 1, 2004
Creator:
Cuesta, I.
Object Type:
Report
System:
The UNT Digital Library
Journal of the Senate, Third and Fourth Called Sessions of the Seventy-Eighth Legislature of the State of Texas, Volume 8
The Journal contains the proceedings of the Senate of Texas including legislation, reports, discussions, votes, and points-of-order. Some volumes also contain supplementary materials. The index for the third called session begins on page 525, and on page 165 for the second called session.
Date:
2004
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
A Texas Baptist History Sourcebook: a Companion to Mcbeth's Texas Baptists
Access:
Use of this item is restricted to the UNT Community
From the days of Z. N. Morrell and James Huckins to Bill Pinson and Charles Wade, Baptists have played and continue to play an important role in the religious, secular, and political life of Texas. Over the previous one hundred and fifty years several Texas Baptist histories have been written, but not until now have the documents used in the development of these texts been made available in one resource. In A Texas Baptist History Sourcebook, Joseph E. Early, Jr., has provided the most complete collection of Texas Baptist sources ever issued in one volume. This work consists of church minutes, state and association convention records, denominational newspaper articles, records of Baptist universities, and myriads of other resources. Included in this work are George Washington Truett's sermon Baptists and Religious Liberty delivered on the steps of the Capitol building in Washington, D.C., James Milton Carroll's Trail of Blood, J. Frank Norriss railings against the Baptist General Convention of Texas, and countless other sources depicting the many years of Texas Baptist history. This book is designed as a complementary work to Harry Leon McBeth's Texas Baptists: A Sesquicentennial History. Students can follow McBeth's chapter divisions, headings, and subheadings for greater ease …
Date:
June 15, 2004
Creator:
Early, Joseph E., Jr
Object Type:
Book
System:
The UNT Digital Library
Neutron and Charged-Particle Induced Cross Sections for Radiochemistry for Isotopes of Scandium, Titanium, Vanadium, Chromium, Manganese, and Iron
We have developed a set of modeled nuclear reaction cross sections for use in radiochemical diagnostics. Local systematics for the input parameters required by the Hauser-Feshbach statistical model were developed and used to calculate neutron and proton induced nuclear reaction cross sections in the mass region of scandium, titanium, vanadium, chromium, manganese, and iron (21 {le} Z {le} 26, 20 {le} N {le} 32).
Date:
November 30, 2004
Creator:
Kelley, K.; Hoffman, R. D.; Dietrich, F. S.; Bauer, R. & Mustafa, M.
Object Type:
Report
System:
The UNT Digital Library
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 34, No. 39, Ed. 1 Thursday, September 23, 2004
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
September 23, 2004
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
Science and Technology Review April 2004
This months issue has the following articles: (1)''Computing Science: One Arrow in the Quiver for Homeland Security''--Commentary by Wayne Shotts; (2) ''On the Front Lines of Biodefense''--The Laboratory's pathogen bioinformatics group is developing ways to rapidly identify microbes that could pose a threat to the nation's citizens, livestock, and crops. (3) ''Defending against Corrosion''--Livermore researchers are designing a rugged system to prevent nuclear wastes from seeping into the environment at the proposed underground repository at Yucca Mountain, Nevada. (4) ''Engine Shows Diesel Efficiency without the Emissions''--Computer models are helping Laboratory engineers better understand the homogeneous compression charge ignition engine, a fuel-efficient engine with reduced emissions.
Date:
February 24, 2004
Creator:
McMahon, D H
Object Type:
Report
System:
The UNT Digital Library
Neutron and Charged-Particle Induced Cross Sections for Radiochemistry in the Region of Samarium, Europium, and Gadolinium
We have developed a set of modeled nuclear reaction cross sections for use in radiochemical diagnostics. Systematics for the input parameters required by the Hauser-Feshbach statistical model were developed and used to calculate neutron and proton induced nuclear reaction cross sections in the mass region of samarium, europium and gadolinium (62 {le} Z {le} 64, 82 {le} N {le} 96).
Date:
November 30, 2004
Creator:
Hoffman, R. D.; Kelley, K.; Dietrich, F. S.; Bauer, R. & Mustafa, M.
Object Type:
Report
System:
The UNT Digital Library
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 34, No. 37, Ed. 1 Thursday, September 9, 2004
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
September 9, 2004
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
Contextualized Risk Assessment in Clinical Practice: Utility of Actuarial, Clinical, and Structured Clinical Approaches to Predictions of Violence.
Assessing offenders' risk of future violent behavior continues to be an important yet controversial role of forensic psychologists. A key debate is the relative effectiveness of assessment methods. Specifically, actuarial methods (see Quinsey et al., 1998 for a review) have been compared and contrasted to clinical and structured clinical methods (see e.g. Hart, 1998; Webster et al., 1997). Proponents of each approach argue for its superiority, yet validity studies have made few formal comparisons. In advancing the available research, the present study examines systematically the type of forensic case (i.e., sexual violence versus nonsexual violence) and type of assessment method (i.e., actuarial, structured clinical, and unstructured clinical). As observed by Borum, Otto, and Golding (1993), forensic decision making can also be influenced by the presence of certain extraneous clinical data. To address these issues, psychologists and doctoral students attending the American Psychology Law Society conference were asked to make several ratings regarding the likelihood of future sexual and nonsexual violence based on data derived from actual defendants with known outcomes. Using a mixed factorial design, each of these assessment methods were investigated for its influence on decision-makers regarding likelihood of future violence and sexually violent predator commitments. Finally, the potentially …
Date:
August 2004
Creator:
Jackson, Rebecca L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Aeronautics Star, March/April 2004, Special Ethics Supplement
Bimonthly newsletter published for employees of the General Dynamics Fort Worth Division containing work-related information, updates about employees, and other news.
Date:
March 2004
Creator:
Lockheed Martin Astronautics Corporation
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Recovery and Visualization of 3D Structure of Chromosomes from Tomographic Reconstruction Images
The objectives of this work include automatic recovery and visualization of a 3D chromosome structure from a sequence of 2D tomographic reconstruction images taken through the nucleus of a cell. Structure is very important for biologists as it affects chromosome functions, behavior of the cell and its state. Chromosome analysis is significant in the detection of deceases and in monitoring environmental gene mutations. The algorithm incorporates thresholding based on a histogram analysis with a polyline splitting algorithm, contour extraction via active contours, and detection of the 3D chromosome structure by establishing corresponding regions throughout the slices. Visualization using point cloud meshing generates a 3D surface. The 3D triangular mesh of the chromosomes provides surface detail and allows a user to interactively analyze chromosomes using visualization software.
Date:
April 28, 2004
Creator:
Babu, S; Liao, P; Shin, M C & Tsap, L V
Object Type:
Article
System:
The UNT Digital Library
Aeronautics Star, Volume 6, Number 3, July/August 2004
Bimonthly newsletter published for employees of Lockheed Martin Aeronautics Co. containing work-related information, updates about employees, and other news.
Date:
July 2004
Creator:
Lockheed Martin Astronautics Corporation
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Bubble merger model for the nonlinear Rayleigh-Taylor instability driven by a strong blast wave
A bubble merger model is presented for the nonlinear evolution of the Rayleigh-Taylor instability driven by a strong blast wave. Single bubble motion is determined by an extension of previous buoyancy-drag models extended to the blast wave driven case, and a simple bubble merger law in the spirit of the Sharp-Wheeler model allows for the generation of larger scales. The blast wave driven case differs in several respects from the classical case of incompressible fluids in a uniform gravitational field. Because of material decompression in the rarefaction behind the blast front, the asymptotic bubble velocity and the merger time depend on time as well as the transverse scale and the drive. For planar blast waves, this precludes the emergence of a self-similar regime independent of the initial conditions. With higher-dimensional blast waves, divergence restores the properties necessary for the establishment of the self-similar state, but its establishment requires a very high initial characteristic mode number and a high Mach number for the incident blast wave.
Date:
March 18, 2004
Creator:
Miles, A R
Object Type:
Report
System:
The UNT Digital Library