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751 Matching Results
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3 GeV Booster Synchrotron Conceptual Design Report
Synchrotron light cna be produced from a relativistic particle beam circulating in a storage ring at extremely high intensity and brilliance over a large spectral region reaching from the far infrared regime to hard x-rays. The particles, either electrons or positrons, radiate as they are deflected in the fields of the storage ring bending magnets or of magnets specially optimized for the production of synchrotron light. The synchrotron light being very intense and well collimated in the forward direction has become a major tool in a large variety of research fields in physics, chemistry, material science, biology, and medicine.
Date:
June 2, 2009
Creator:
Wiedemann, Helmut
Object Type:
Report
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 111, No. 234, Ed. 1 Tuesday, June 2, 2009
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 2, 2009
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[American National Bank of Texas Deposit Receipt and Summary]
Checking deposit receipt of $45.00 made on June 2, 2009, and deposit summary of $45.00 made on June 2, 2009.
Date:
June 2, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Analytic one-loop amplitudes for a Higgs boson plus four partons
We compute the one-loop QCD amplitudes for the processes H{anti q}q{anti Q}Q and H{anti q}qgg, the latter restricted to the case of opposite-helicity gluons. Analytic expressions are presented for the color- and helicity-decomposed amplitudes. The coupling of the Higgs boson to gluons is treated by an effective interaction in the limit of large top quark mass. The Higgs field is split into a complex field {phi} and its complex conjugate {phi}{sup {dagger}}. The split is useful because amplitudes involving {phi} have different analytic structure from those involving {phi}{sup {dagger}}. We compute the cut-containing pieces of the amplitudes using generalized unitarity. The remaining rational parts are obtained by on-shell recursion. Our results for H{anti q}q{anti Q}Q agree with previous semi-numerical computations. We also show how to convert existing semi-numerical results for the production of a scalar Higgs boson into analogous results for a pseudoscalar Higgs boson.
Date:
June 2, 2009
Creator:
Dixon, Lance J. & Sofianatos, Yorgos
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 89, No. 149, Ed. 1 Tuesday, June 2, 2009
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
June 2, 2009
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 103, No. 44, Ed. 1 Tuesday, June 2, 2009
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
June 2, 2009
Creator:
Cartwright, Brian & Velvin, Candace E.
Object Type:
Newspaper
System:
The Portal to Texas History
Congressional Oversight and Related Issues Concerning International Security Agreements Concluded by the United States
This report begins by providing a general background on the types of international agreements that are binding upon the United States, as well as considerations affecting whether they take the form of a treaty or an executive agreement. Next, the report discusses historical precedents as to the role that security agreements have taken. The report discusses the oversight role that Congress exercises with respect to entering and implementing international agreements involving the United States.
Date:
June 2, 2009
Creator:
Garcia, Michael J. & Mason, R. C.
Object Type:
Report
System:
The UNT Digital Library
Costa Rica: Background and U.S. Relations
This report provides information about the Background and U.S. Relations of Costa Rica. Costa Rica has established a diverse economy with a strong export sector.
Date:
June 2, 2009
Creator:
Meyer, Peter J.
Object Type:
Report
System:
The UNT Digital Library
Costa Rica: Background and U.S. Relations
Costa Rica is a relatively politically stable and economically developed nation with a long tradition of civilian democracy. Once a predominantly agricultural nation, Costa Rica has established a diversified economy with a strong export sector. This report examines recent political and economic developments in Costa Rica as well as issues in U.S.-Costa Rica relations.
Date:
June 2, 2009
Creator:
Meyer, Peter J.
Object Type:
Report
System:
The UNT Digital Library
Covariance Spectroscopy for Fissile Material Detection
Nuclear fission produces multiple prompt neutrons and gammas at each fission event. The resulting daughter nuclei continue to emit delayed radiation as neutrons boil off, beta decay occurs, etc. All of the radiations are causally connected, and therefore correlated. The correlations are generally positive, but when different decay channels compete, so that some radiations tend to exclude others, negative correlations could also be observed. A similar problem of reduced complexity is that of cascades radiation, whereby a simple radioactive decay produces two or more correlated gamma rays at each decay. Covariance is the usual means for measuring correlation, and techniques of covariance mapping may be useful to produce distinct signatures of special nuclear materials (SNM). A covariance measurement can also be used to filter data streams because uncorrelated signals are largely rejected. The technique is generally more effective than a coincidence measurement. In this poster, we concentrate on cascades and the covariance filtering problem.
Date:
June 2, 2009
Creator:
Rusty Trainham, Jim Tinsley, Paul Hurley, Ray Keegan
Object Type:
Article
System:
The UNT Digital Library
Cuban Migration to the United States: Policy and Trends
This report opens with a historical analysis of the unique immigration policy that evolved with Cuba and an explanation of its nexus with other federal policies. It follows with time series analysis of Cuban migration trends. The report concludes by discussing current challenges and issues.
Date:
June 2, 2009
Creator:
Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library
[Daniel Graney email correspondence]
Email from Daniel Graney to Al Daniels about the Texas Stonewall Democratic Caucus budget.
Date:
June 2, 2009
Creator:
Graney, Daniel
Object Type:
Text
System:
The UNT Digital Library
Data Parallel Bin-Based Indexing for Answering Queries on Multi-Core Architectures
The multi-core trend in CPUs and general purpose graphics processing units (GPUs) offers new opportunities for the database community. The increase of cores at exponential rates is likely to affect virtually every server and client in the coming decade, and presents database management systems with a huge, compelling disruption that will radically change how processing is done. This paper presents a new parallel indexing data structure for answering queries that takes full advantage of the increasing thread-level parallelism emerging in multi-core architectures. In our approach, our Data Parallel Bin-based Index Strategy (DP-BIS) first bins the base data, and then partitions and stores the values in each bin as a separate, bin-based data cluster. In answering a query, the procedures for examining the bin numbers and the bin-based data clusters offer the maximum possible level of concurrency; each record is evaluated by a single thread and all threads are processed simultaneously in parallel. We implement and demonstrate the effectiveness of DP-BIS on two multi-core architectures: a multi-core CPU and a GPU. The concurrency afforded by DP-BIS allows us to fully utilize the thread-level parallelism provided by each architecture--for example, our GPU-based DP-BIS implementation simultaneously evaluates over 12,000 records with an equivalent …
Date:
June 2, 2009
Creator:
Gosink, Luke; Wu, Kesheng; Bethel, E. Wes; Owens, John D. & Joy, Kenneth I.
Object Type:
Article
System:
The UNT Digital Library
Determination of the Atmospheric Neutrino Flux and Searches for New Physics with AMANDA-II
The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has accumulated a large sample of atmospheric muon neutrinos in the 100 GeV to 10 TeV energy range. The zenith angle and energy distribution of these events can be used to search for various phenomenological signatures of quantum gravity in the neutrino sector, such as violation of Lorentz invariance (VLI) or quantum decoherence (QD). Analyzing a set of 5511 candidate neutrino events collected during 1387 days of livetime from 2000 to 2006, we find no evidence for such effects and set upper limits on VLI and QD parameters using a maximum likelihood method. Given the absence of evidence for new flavor-changing physics, we use the same methodology to determine the conventional atmospheric muon neutrino flux above 100 GeV.
Date:
June 2, 2009
Creator:
Collaboration, IceCube; Klein, Spencer & Collaboration, IceCube
Object Type:
Article
System:
The UNT Digital Library
Doctoral Recital: 2009-06-02 - Katrin Meidell, viola
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
June 2, 2009
Creator:
Meidell, Katrin
Object Type:
Sound
System:
The UNT Digital Library
Effects of Beam Filling Pattern on Beam Ion Instability and Beam Loading In PEP-X
A proposed high-brightness synchrotron light source (PEP-X) is under design at SLAC. The 4.5-GeV PEP-X storage ring has four theoretical minimum emittance (TME) cells to achieve the very low emittance and two double-bend achromat (DBA) cells to provide spaces for IDs. Damping wigglers will be installed in zero-dispersion straights to reduce the emittance below 0.1 nm. Ion induced beam instability is one critical issue due to its ultra small emittance. Third harmonic cavity can be used to lengthen the bunch in order to improve the beam's life time. Bunch-train filling pattern is proposed to mitigate both the fast ion instability and beam loading effect. This paper investigates the fast ion instability and beam loading for different beam filling patterns.
Date:
June 2, 2009
Creator:
Wang, L.
Object Type:
Article
System:
The UNT Digital Library
Enthalpy of Formation of the Cyclohexadienyl Radical and the C-H Bond Enthalpy of 1,4-Cyclohexadiene: An Experimental and Computational Re-Evaluation
This article discusses the enthalpy of formation of the cyclohexadienyl radical and the C-H bond enthalpy of 1,4-cyclohexadiene.
Date:
June 2, 2009
Creator:
Gao, Yide; DeYonker, Nathan J.; Garrett, E. Chauncey; Wilson, Angela K.; Cundari, Thomas R., 1964- & Marshall, Paul
Object Type:
Article
System:
The UNT Digital Library
Enthalpy of Formation of the Cyclohexadienyl Radical and the C-H Bond Enthalpy of 1,4-Cyclohexadiene: An Experimental and Computational Re-Evaluation
Article on an experimental and computational re-evaluation and the enthalpy of formation of the cyclohexadienyl radical and the C-H bond enthalpy of 1,4-cyclohexadiene.
Date:
June 2, 2009
Creator:
Gao, Yide; DeYonker, Nathan J.; Garrett, E. Chauncey; Wilson, Angela K.; Cundari, Thomas R., 1964- & Marshall, Paul
Object Type:
Article
System:
The UNT Digital Library
Espisodic detachment of Martian crustal magnetic fields leading to bulk atmospheric plasma escape
We present an analysis of magnetic field and suprathermal electron measurements from the Mars Global Surveyor (MGS) spacecraft that reveals isolated magnetic structures filled with Martian atmospheric plasma located downstream from strong crustal magnetic fields with respect to the flowing solar wind. The structures are characterized by magnetic field enhancements and rotations characteristic of magnetic flux ropes, and characteristic ionospheric electron energy distributions with angular distributions distinct from surrounding regions. These observations indicate that significant amounts of atmosphere are intermittently being carried away from Mars by a bulk removal process: the top portions of crustal field loops are stretched through interaction with the solar wind and detach via magnetic reconnection. This process occurs frequently and may account for as much as 10% of the total present-day ion escape from Mars.
Date:
June 2, 2009
Creator:
Brain, D A; Baker, A H; Briggs, J; Eastwood, J P; Halekas, J S & Phan, T
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, June 2, 2009
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 2, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Final Report PIPELINING RDP DATA TO THE "TAXOMATIC"
This project builds on the results of previously funded research by integrating data and software that had been previously used in building resources used in the preparation of Bergey?s Manual of Systematic Bacteriology, 2nd Edition (Volumes 1 & 2A-C) and the Ribosomal Database Project-II (RDP-II) so as to both enhance the value of the data and create a pipeline approach to keeping the data current. Earlier, we demonstrated the value of using exploratory data analysis (EDA) to visualize large sets of sequence data (notably SSU rRNA gene sequences used in constructing a comprehensive phylogeny of prokaryotes. While the Self- Organizing Self-Correcting Classification (SOSCC) algorithms we developed were computationally efficient and useful for unraveling problems within the underlying data (e.g., identification of annotation errors, detection of unresolved synonymies, taxonomic and nomenclatural errors), bottlenecks at the preprocessing stage limited deployment of our applications as tools for end-users. To overcome the bottlenecks (which included hand alignment and computation of large matrices of pair-wise evolutionary distances), we proposed building a data pipeline between the ?Taxomatic? application and RDP-II. The objectives were to accelerate the production and distribution of the updated versions of the prokaryotic taxonomy in lock-step with publication of new taxa and rearrangement …
Date:
June 2, 2009
Creator:
Garrity, George
Object Type:
Report
System:
The UNT Digital Library
Freight Issues in Surface Transportation Reauthorization
None
Date:
June 2, 2009
Creator:
Frittelli, John & Mallett, William J.
Object Type:
Report
System:
The UNT Digital Library
Functional Requirements on the Design of the Detectors and the Interaction Region of an e e- Linear Collider with a Push-Pull Arrangement of Detectors
The Interaction Region of the International Linear Collider is based on two experimental detectors working in a push-pull mode. A time efficient implementation of this model sets specific requirements and challenges for many detector and machine systems, in particular the IR magnets, the cryogenics and the alignment system, the beamline shielding, the detector design and the overall integration. This paper attempts to separate the functional requirements of a push pull interaction region and machine detector interface from any particular conceptual or technical solution that might have been proposed to date by either the ILC Beam Delivery Group or any of the three detector concepts. As such, we hope that it provides a set of ground rules for interpreting and evaluating the MDI parts of the proposed detector concept's Letters of Intent, due March 2009. The authors of the present paper are the leaders of the IR Integration Working Group within Global Design Effort Beam Delivery System and the representatives from each detector concept submitting the Letters Of Intent.
Date:
June 2, 2009
Creator:
Parker, B.; /Brookhaven; Mikhailichenko, A.; /Cornell U., LEPP; Buesser, K.; /DESY et al.
Object Type:
Article
System:
The UNT Digital Library
The Greensheet (Houston, Tex.), Vol. 40, No. 205, Ed. 1 Tuesday, June 2, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
June 2, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History