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2-D Modeling of Energy-z Beam Dynamics Using the LiTrack Matlab Program
Short bunches and the bunch length distribution have important consequences for both the LCLS project at SLAC and the proposed ILC project. For both these projects, it is important to simulate what bunch length distributions are expected and then to perform actual measurements. The goal of the research is to determine the sensitivity of the bunch length distribution to accelerator phase and voltage. This then indicates the level of control and stability that is needed. In this project I simulated beamlines to find the rms bunch length in three different beam lines at SLAC, which are the test beam to End Station A (ILC-ESA) for the ILC studies, Linac Coherent Light Source (LCLS) and LCLS-ESA. To simulate the beamlines, I used the LiTrack program, which does a 2-dimensional tracking of an electron bunch's longitudinal (z) and the energy spread beam (E) parameters. In order to reduce the time of processing the information, I developed a small program to loop over adjustable machine parameters. LiTrack is a Matlab script and Matlab is also used for plotting and saving and loading files. The results show that the LCLS in Linac-A is the most sensitive when looking at the ratio of change in …
Date:
December 15, 2005
Creator:
Cauley, S .K. & Woods, M.
Object Type:
Report
System:
The UNT Digital Library
3-Nitropropionic Acid is a Suicide Inhibitor of MitochondrialRespiration that, Upon Oxidation by Complex II, Forms a Covalent AdductWith a Catalytic Base Arginine in the Active Site of the Enzyme
We report three new structures of mitochondrial respiratory Complex II (succinate ubiquinone oxidoreductase, E.C. 1.3.5.1) at up to 2.1 {angstrom} resolution, with various inhibitors. The structures define the conformation of the bound inhibitors and suggest the residues involved in substrate binding and catalysis at the dicarboxylate site. In particular they support the role of Arg297 as a general base catalyst accepting a proton in the dehydrogenation of succinate. The dicarboxylate ligand in oxaloacetate-containing crystals appears to be the same as that reported for Shewanella flavocytochrome c treated with fumarate. The plant and fungal toxin 3-nitropropionic acid, an irreversible inactivator of succinate dehydrogenase, forms a covalent adduct with the side chain of Arg297. The modification eliminates a trypsin cleavage site in the flavoprotein, and tandem mass spectroscopic analysis of the new fragment shows the mass of Arg 297 to be increased by 83 Da and to have potential of losing 44 Da, consistent with decarboxylation, during fragmentation.
Date:
December 1, 2005
Creator:
Huang, Li-shar; Sun, Gang; Cobessi, David; Wang, Andy C.; Shen,John T.; Tung, Eric Y. et al.
Object Type:
Article
System:
The UNT Digital Library
19-electron intermediates in the Ligand Substitution of CpW(CO)3with a Lewis Base
Odd electron species are important intermediates in organometallic chemistry, participating in a variety of catalytic and electron-transfer reactions which produce stable even-electron products. While electron deficient 17-electron (17e) radicals have been well characterized, the possible existence of short-lived 19-electron (19e) radicals has been a subject of continuing investigation. 19e radicals have been postulated as intermediates in the photochemical ligand substitution and disproportionation reactions of organometallic dimers containing a single metal-metal bond, yet the reactions of these intermediates on diffusion-limited time scales (ns-{micro}s) have never been directly observed. This study resolves the 19e dynamics in the ligand substitution of 17e radicals CpW(CO){sub 3}{sup {sm_bullet}} (Cp = C{sub 5}H{sub 5}) with the Lewis base P(OMe){sub 3}, providing the first complete description 19e reactivity.
Date:
December 14, 2005
Creator:
Cahoon, James F.; Kling, Matthias F.; Sawyer, Karma R.; Frei,Heinz & Harris, Charles B.
Object Type:
Article
System:
The UNT Digital Library
120 MW, 800 MHz Magnicon for a Future Muon Collider
Development of a pulsed magnicon at 800 MHz was carried out for the muon collider application, based on experience with similar amplifiers in the frequency range between 915 MHz and 34.3 GHz. Numerical simulations using proven computer codes were employed for the conceptual design, while established design technologies were incorporated into the engineering design. A cohesive design for the 800 MHz magnicon amplifier was carried out, including design of a 200 MW diode electron gun, design of the magnet system, optimization of beam dynamics including space charge effects in the transient and steady-state regimes, design of the drive, gain, and output cavities including an rf choke in the beam exit aperture, analysis of parasitic oscillations and design means to eliminate them, and design of the beam collector capable of 20 kW average power operation.
Date:
December 15, 2005
Creator:
Hirshfield, Jay L.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 35, No. 13, Ed. 1 Friday, December 2, 2005
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 2, 2005
Creator:
Waltman, Erin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 35, No. 14, Ed. 1 Monday, December 12, 2005
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 12, 2005
Creator:
Waltman, Erin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
2005 Final Report: New Technologies for Future Colliders
This document presents an annual report on our long-term R&D grant for development of new technology for future colliders. The organizing theme of our development is to develop a compact high-field collider dipole, utilizing wind-and-react Nb3Sn coil fabrication, stress man-agement, conductor optimization, bladder preload, and flux plate suppression of magnetization multipoles. The development trail for this new technology began over four years ago with the successful testing of TAMU12, a NbTi model in which we put to a first test many of the construction details of the high-field design. We have built TAMU2, a mirror-geometry dipole containing a single coil module of the 3-module set required for the 14 Tesla design. This first Nb3Sn model was built using ITER conductor which carries much less current than high-performance conductor but enables us to prove in practice our reaction bake and impregnation strategies with ‘free’ su-perconductor. TAMU2 has been shipped to LBNL for testing. Work is beginning on the construction of TAMU3, which will contain two coil modules of the 14 Tesla design. TAMU3 has a design field of 13.5 Tesla and will enable us to fully evaluate the issues of stress management that will be important to the full design. With …
Date:
December 31, 2005
Creator:
McIntyre, Peter & McInturff, Al
Object Type:
Report
System:
The UNT Digital Library
2nd High-Level Meeting on Health and Environment in ASEAN and East Asian Countries
The Second High-Level Meeting on Environment and Health in ASEAN and East Asian countries was held in Bangkok, Thailand during 12-13 December 2005. The meeting follows a continuation of the process, which began in Manila in November 2004, where a regional initiative on environment and health was launched by ADB, WHO, and UNEP. It was attended by Representatives from Government and International Agencies and Institutions. The List of Participants is attached as Annexure 2
Date:
October 2010
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
7Be(p,(gamma))8B S-factor from Ab Initio No-Core Shell Model Wave Functions
Nuclear structure of {sup 7}Be, {sup 8}B and {sup 7,8}Li is studied within the ab initio no-core shell model (NCSM). Starting from high-precision nucleon-nucleon (NN) interactions, wave functions of {sup 7}Be and {sup 8}B bound states are obtained in basis spaces up to 10 h bar{Omega} and used to calculate channel cluster form factors (overlap integrals) of the {sup 8}B ground state with {sup 7}Be+p. Due to the use of the harmonic oscillator (HO) basis, the overlap integrals have incorrect asymptotic properties. We fix this problem in two alternative ways. First, by a Woods-Saxon (WS) potential solution fit to the interior of the NCSM overlap integrals. Second, by a direct matching with the Whittaker function. The corrected overlap integrals are then used for the {sup 7}Be(p,{gamma}){sup 8}B S-factor calculation. We study the convergence of the S-factor with respect to the NCSM HO frequency and the model space size. Our S-factor results are in agreement with recent direct measurement data. We also test the spectroscopic factors and the corrected overlap integrals from the NCSM in describing the momentum distributions in knockout reactions with {sup 8}B projectiles. A good agreement with the available experimental data is also found, attesting the overall consistency …
Date:
December 2, 2005
Creator:
Navratil, P; Bertulani, C A & Caurier, E
Object Type:
Article
System:
The UNT Digital Library
Abilene Philharmonic Playbill: December 3-January 14, 2006
Program for an Abilene Philharmonic concert that ran from December 3rd to January 14th (Pop I and Classical III) during the 56th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
December 2005
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
Accelerator systems and instrumentation for the NuMI neutrino beam
None
Date:
December 1, 2005
Creator:
Zwaska, Robert Miles
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adaptive Management and Planning Models for Cultural Resources in Oil and Gas Fields in New Mexico and Wyoming
In 2002, Gnomon, Inc., entered into a cooperative agreement with the U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) for a project entitled, Adaptive Management and Planning Models for Cultural Resources in Oil and Gas Fields in New Mexico and Wyoming (DE-FC26-02NT15445). This project, funded through DOE’s Preferred Upstream Management Practices grant program, examined cultural resource management practices in two major oil- and gas-producing areas, southeastern New Mexico and the Powder River Basin of Wyoming (Figure 1). The purpose of this project was to examine how cultural resources have been investigated and managed and to identify more effective management practices. The project also was designed to build information technology and modeling tools to meet both current and future management needs. The goals of the project were described in the original proposal as follows: Goal 1. Create seamless information systems for the project areas. Goal 2. Examine what we have learned from archaeological work in the southeastern New Mexico oil fields and whether there are better ways to gain additional knowledge more rapidly or at a lower cost. Goal 3. Provide useful sensitivity models for planning, management, and as guidelines for field investigations. Goal 4. Integrate management, investigation, and …
Date:
December 30, 2005
Creator:
Eckerle, William & Hall, Stephen
Object Type:
Report
System:
The UNT Digital Library
Adaptive mesh refinement for time-domain electromagnetics using vector finite elements :a feasibility study.
This report investigates the feasibility of applying Adaptive Mesh Refinement (AMR) techniques to a vector finite element formulation for the wave equation in three dimensions. Possible error estimators are considered first. Next, approaches for refining tetrahedral elements are reviewed. AMR capabilities within the Nevada framework are then evaluated. We summarize our conclusions on the feasibility of AMR for time-domain vector finite elements and identify a path forward.
Date:
December 1, 2005
Creator:
Turner, C. David; Kotulski, Joseph Daniel & Pasik, Michael Francis
Object Type:
Report
System:
The UNT Digital Library
Additional Scoping Calculations of Tank 50 and Tank 48 Vapor Space Mixing
Prepared by the United States Government, this report talks about Additional Scoping Calculations of Tank 50 and Tank 48 Vapor Space Mixing.
Date:
December 27, 2005
Creator:
Lee, Young Si
Object Type:
Report
System:
The UNT Digital Library
Adequate Yearly Progress (AYP): Might Growth Models Be Allowed Under the No Child Left Behind Act?
The Environmental Protection Agency (EPA) is currently engaged in a series of regulatory actions to address the transport of ozone pollution in the eastern United States. This report reviews this situation with respect to an EPA-proposed Ozone Transport Rule and other activities.
Date:
December 1, 2005
Creator:
Riddle, Wayne C.
Object Type:
Report
System:
The UNT Digital Library
Adhesive Testing for the BTeV Pixel Detector
The basic unit of the BTeV pixel detector is a multi-chip module which is comprised of a silicon sensor module bump-bonded to a number of readout chips. The pixel module will then be glued to a high intensity interconnect (HDI) cable using electrically conductive adhesive, and then onto a substrate using another kind of adhesive with reasonable thermal conductivity. This report is mostly addressed to the need of the latter--the substrate adhesive. The aim of this technical note is to summarize the testing efforts and results of this substrate adhesive covering a period since 2001 till the end of 2004. The substrate will serve two purposes: mechanical support and cooling of the modules. Stresses and strains will be generated when there is a thermal change on the substrate. In addition, since there are many kinds of materials, with different coefficient of thermal expansion (CTE), being glued together to form the complete detector assembly, the substrate may get distorted due to the CTE mismatches. As stress is directly proportional to the material modulus, a significant amount of effort was concentrated in understanding the adhesive modulus. There are other constraints which need to be considered as well. For instance, the detector will …
Date:
December 1, 2005
Creator:
Lei, C. M.; Kwan, Simon; Hicks, D.; Hahn, Eileen; Hoffman, Jay; Austin, Sharon et al.
Object Type:
Report
System:
The UNT Digital Library
[Adult students and instructor]
Fotografía de un instructor no identificado de pie en la parte delantera de un aula, gesticulando con las manos mientras habla con varios estudiantes adultos que están sentados a lo largo de un lado de una mesa (derecha). Hay un proyector, en el que se ve la palabra 'Negocio', y una pizarra de presentación con un cuaderno de papel detrás del instructor. Hay carpetas abiertas y un cuaderno en la mesa frente a los alumnos.
Date:
December 16, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
Advanced Extraction Methods for Actinide/Lanthanide Separations
The separation of An(III) ions from chemically similar Ln(III) ions is perhaps one of the most difficult problems encountered during the processing of nuclear waste. In the 3+ oxidation states, the metal ions have an identical charge and roughly the same ionic radius. They differ strictly in the relative energies of their f- and d-orbitals, and to separate these metal ions, ligands will need to be developed that take advantage of this small but important distinction. The extraction of uranium and plutonium from nitric acid solution can be performed quantitatively by the extraction with the TBP (tributyl phosphate). Commercially, this process has found wide use in the PUREX (plutonium uranium extraction) reprocessing method. The TRUEX (transuranium extraction) process is further used to coextract the trivalent lanthanides and actinides ions from HLLW generated during PUREX extraction. This method uses CMPO [(N, N-diisobutylcarbamoylmethyl) octylphenylphosphineoxide] intermixed with TBP as a synergistic agent. However, the final separation of trivalent actinides from trivalent lanthanides still remains a challenging task. In TRUEX nitric acid solution, the Am(III) ion is coordinated by three CMPO molecules and three nitrate anions. Taking inspiration from this data and previous work with calix[4]arene systems, researchers on this project have developed a …
Date:
December 1, 2005
Creator:
Scott, M. J.
Object Type:
Report
System:
The UNT Digital Library
Advanced microscopy :time-resolved multi-spectral imaging of single biomolecules.
Over the past few years we have developed the ability to acquire images through a confocal microscope that contain, for each pixel, the simultaneous fluorescence lifetime and spectra of multiple fluorophores within that pixel. We have demonstrated that our system has the sensitivity to make these measurements on single molecules. The spectra and lifetimes of fluorophores bound to complex molecules contain a wealth of information on the conformational dynamics and local chemical environments of the molecules. However, the detailed record of spectral and temporal information our system provides from fluorophores in single molecules has not been previously available. Therefore, we have studied several fluorophores and simple fluorophore-molecule systems that are representative of the use of fluorophores in biological systems. Experiments include studies of a simple fluorescence resonance energy transfer (FRET) system, green fluorescent probe variants and quantum dots. This work is intended to provide a basis for understanding how fluorophores report on the chemistry of more complex biological molecules.
Date:
December 1, 2005
Creator:
Hayden, Carl C.; Chandler, David W.; Gradinaru, Claudiu C. & Luong, A. Khai
Object Type:
Report
System:
The UNT Digital Library
Advanced Microturbine Systems
Dept. of Energy (DOE) Cooperative Agreement DE-FC02-00-CH11061 was originally awarded to Honeywell International, Inc. â Honeywell Power Systems Inc. (HPSI) division located in Albuquerque, NM in October 2000 to conduct a program titled Advanced Microturbine Systems (AMS). The DOE Advanced Microturbines Systems Program was originally proposed as a five-year program to design and develop a high efficiency, low emissions, durable microturbine system. The period of performance was to be October 2000 through September 2005. Program efforts were underway, when one year into the program Honeywell sold the intellectual property of Honeywell Power Systems Inc. and HPSI ceased business operations. Honeywell made an internal decision to restructure the existing program due to the HPSI shutdown and submitted a formal request to DOE on September 24, 2001 to transfer the Cooperative Agreement to Honeywell Engines, Systems and Services (HES&S) in Phoenix, AZ in order to continue to offer support for DOE's Advanced Microturbine Program. Work continued on the descoped program under Cooperative Agreement No. DE-FC26-00-CH11061 and has been completed.
Date:
December 31, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced Oxyfuel Boilers and Process Heaters for Cost Effective CO2 Capture and Sequestration
This annual technical progress report summarizes the work accomplished during the third year of the program, January-December 2005, in the following task areas: Task 1--Conceptual Design, Task 2--Laboratory Scale Evaluations, Task 3--OTM Development, Task 4--Economic Evaluation and Commercialization Planning and Task 5--Program Management.
Date:
December 31, 2005
Creator:
Christie, Max; Victor, Rick; Li, Juan & Hassel, Bart Van
Object Type:
Report
System:
The UNT Digital Library
Advanced proton-exchange materials for energy efficient fuel cells.
The ''Advanced Proton-Exchange Materials for Energy Efficient Fuel Cells'' Laboratory Directed Research and Development (LDRD) project began in October 2002 and ended in September 2005. This LDRD was funded by the Energy Efficiency and Renewable Energy strategic business unit. The purpose of this LDRD was to initiate the fundamental research necessary for the development of a novel proton-exchange membranes (PEM) to overcome the material and performance limitations of the ''state of the art'' Nafion that is used in both hydrogen and methanol fuel cells. An atomistic modeling effort was added to this LDRD in order to establish a frame work between predicted morphology and observed PEM morphology in order to relate it to fuel cell performance. Significant progress was made in the area of PEM material design, development, and demonstration during this LDRD. A fundamental understanding involving the role of the structure of the PEM material as a function of sulfonic acid content, polymer topology, chemical composition, molecular weight, and electrode electrolyte ink development was demonstrated during this LDRD. PEM materials based upon random and block polyimides, polybenzimidazoles, and polyphenylenes were created and evaluated for improvements in proton conductivity, reduced swelling, reduced O{sub 2} and H{sub 2} permeability, and increased …
Date:
December 1, 2005
Creator:
Fujimoto, Cy H.; Grest, Gary Stephen; Hickner, Michael A.; Cornelius, Christopher James; Staiger, Chad Lynn & Hibbs, Michael R.
Object Type:
Report
System:
The UNT Digital Library
ADVANCED RECIPROCATING COMPRESSION TECHNOLOGY (ARCT)
The U.S. natural gas pipeline industry is facing the twin challenges of increased flexibility and capacity expansion. To meet these challenges, the industry requires improved choices in gas compression to address new construction and enhancement of the currently installed infrastructure. The current fleet of installed reciprocating compression is primarily slow-speed integral machines. Most new reciprocating compression is and will be large, high-speed separable units. The major challenges with the fleet of slow-speed integral machines are: limited flexibility and a large range in performance. In an attempt to increase flexibility, many operators are choosing to single-act cylinders, which are causing reduced reliability and integrity. While the best performing units in the fleet exhibit thermal efficiencies between 90% and 92%, the low performers are running down to 50% with the mean at about 80%. The major cause for this large disparity is due to installation losses in the pulsation control system. In the better performers, the losses are about evenly split between installation losses and valve losses. The major challenges for high-speed machines are: cylinder nozzle pulsations, mechanical vibrations due to cylinder stretch, short valve life, and low thermal performance. To shift nozzle pulsation to higher orders, nozzles are shortened, and to …
Date:
December 1, 2005
Creator:
Deffenbaugh, Danny M.; Brun, Klaus; Harris, Ralph E.; Harrell, J. Pete; Mckee, Robert J.; Moore, J. Jeffrey et al.
Object Type:
Report
System:
The UNT Digital Library
[Aerial view of Cross Plains]
Aerial photograph of Cross Plains after firestorm.
Date:
December 2005
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History