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397
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113
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57
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47
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45
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35
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26
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17
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734 Matching Results
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Collaboratory for support of scientific research
Collaboration is an increasingly important aspect of magnetic fusion energy research. With the increased size and cost of experiments needed to approach reactor conditions, the numbers being constructed has become limited. In order to satisfy the desire for many groups to conduct research on these facilities, we have come to rely more heavily on collaborations. Fortunately, at the same time, development of high performance computers and fast and reliable wide area networks has provided technological solutions necessary to support the increasingly distributed work force without the need for relocation of entire research staffs. Development of collaboratories, collaborative or virtual laboratories, is intended to provide the capability needed to interact from afar with colleagues at multiple sites. These technologies are useful to groups interacting remotely during experimental operations as well as to those involved in the development of analysis codes and large scale simulations The term ``collaboratory`` refers to a center without walls in which researchers can perform their studies without regard to geographical location - interacting with colleagues, accessing instrumentation, sharing data and computational resources, and accessing information from digital libraries [1],[2]. While it is widely recognized that remote collaboration is not a universal replacement for personal contact, it does …
Date:
June 25, 1998
Creator:
Casper, T. A.; Meyer, W. H. & Moller, J. M.
Object Type:
Article
System:
The UNT Digital Library
Collective Effects in the NSLS-II Storage Ring.
A new high-brightness synchrotron light source (NSLS-II) is under design at BNL. The 3-GeV NSLS-II storage ring has a double-bend achromatic lattice with damping wigglers installed in zero-dispersion straights to reduce the emittance below 1nm. In this paper, we present an overview of the impact of collective effects upon the performance of the storage ring. Subjects discussed include instability thresholds, Touschek lifetime and intra-beam scattering.
Date:
June 25, 2007
Creator:
Krinsky, S.; Bengtsson, J.; Berg, J. S.; Blaskiewicz, M.; Blednykh, A.; Guo, W. et al.
Object Type:
Article
System:
The UNT Digital Library
Collective Effects in the Rhic-Ii Electron Cooler
Electron cooling at RHIC-I1 upgrade imposes strict requirements on the quality of the electron beam at the cooling section. Beam current dependent effects such as the space charge, wake fields, CSR in bending magnets, trapped ions, etc., will tend to spoil the beam quality and decrease the cooling efficiency. In this paper, we estimate the defocusing effect of the space charge at the cooling section and describe our plan to compensate the defocusing space charge force by focusing solenoids. We also estimate the energy and emittance growth cased by wake fields. Finally, we discuss ion trapping in the electron cooler and consider different techniques to minimize the effect of ion trapping.
Date:
June 25, 2007
Creator:
Pozdeyev, E.; Ben-Zvi, Ilan; Fedotov, A.; Kayran, D.; Litvinenko, V. & Wang, G.
Object Type:
Article
System:
The UNT Digital Library
Collective Effects in the SuperB Collider
Some collective effects have been studied for the SuperB high luminosity collider. Estimates of the effect of Intra Beam Scattering (IBS) on the emittance and energy spread growths have been carried up for both the High Energy (HER, positrons) and the Low Energy (LER, electrons) rings. Electron cloud build up simulations for HER were performed with the ECLOUD code, developed at CERN, to predict the cloud formation in the arcs, taking into account possible remediation techniques such as clearing electrodes. The new code CMAD, developed at SLAC, has been used to study the effect of this electron cloud on the beam and assess the thresholds above which the electron cloud instability would set in.
Date:
June 25, 2012
Creator:
Demma, Theo; /INFN, Rome & Pivi, Mauro
Object Type:
Article
System:
The UNT Digital Library
Colliding pulse injection experiments in non-collinear geometryfor controlled laser plasma wakefield acceleration of electrons
An optical injection scheme for a laser-plasma basedaccelerator which employs a non-collinear counter-propagating laser beamto push background electrons in the focusing and acceleration phase viaponderomotive beat with the trailing part of the wakefield driver pulseis discussed. Preliminary experiments were performed using a drive beamof a_0 = 2.6 and colliding beam of a_1 = 0.8 both focused on the middleof a 200 mu m slit jet backed with 20 bar, which provided ~; 260 mu mlong gas plume. The enhancement in the total charge by the collidingpulse was observed with sharp dependence on the delay time of thecolliding beam. Enhancement of the neutron yield was also measured, whichsuggests a generation of electrons above 10 MeV.
Date:
June 25, 2007
Creator:
Toth, Carl B.; Esarey, Eric H.; Geddes, Cameron G.R.; Leemans,Wim P.; Nakamura, Kei; Panasenko, Dmitriy et al.
Object Type:
Article
System:
The UNT Digital Library
Color Production From Energetic Ions Impinging On Metals
It has been observed that energetic gaseous ions mark their region of impingement on certain metals in color. Under identical conditions of bombardment, multicharged ions of the same gas mark their impact areas with different colors. The colors are sensitive to the type and energy of the ion as well as to the metal bombarded. These colors may result from reflections from thin films formed by reactions at the target. Because the colors indicate that thicker films are produced with increased ion energy, ion penetration depth as predicted by theory is compared with the depth indicated by the colors observed.
Date:
June 25, 1962
Creator:
Ehlers, Kenneth W.
Object Type:
Report
System:
The UNT Digital Library
Combating Nuclear Smuggling: Lessons Learned from DHS Testing of Advanced Radiation Detection Portal Monitors
Testimony issued by the Government Accountability Office with an abstract that begins "The Department of Homeland Security's (DHS) Domestic Nuclear Detection Office (DNDO) is responsible for addressing the threat of nuclear smuggling. Radiation detection portal monitors are key elements in the nation's defenses against such threats. DHS has sponsored testing to develop new monitors, known as advanced spectroscopic portal (ASP) monitors, to replace radiation detection equipment being used at ports of entry. DNDO expects that ASPs may offer improvements over current-generation portal monitors, particularly the potential to identify as well as detect radioactive material and thereby to reduce both the risk of missed threats and the rate of innocent alarms, which DNDO considers to be key limitations of radiation detection equipment currently used by Customs and Border Protection (CBP) at U.S. ports of entry. However, ASPs cost significantly more than current generation portal monitors. Due to concerns about ASPs' cost and performance, Congress has required that the Secretary of Homeland Security certify that ASPs provide a significant increase in operational effectiveness before obligating funds for full-scale ASP procurement. This testimony addresses (1) GAO findings on DNDO's latest round of ASP testing, and (2) lessons from ASP testing that can be …
Date:
June 25, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Combating Terrorism: Analysis of Federal Counterterrorist Exercises
A briefing report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on its analysis of federal counterterrorist exercises."
Date:
June 25, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
E-Commerce and Personal Jurisdiction: Are Participating Businesses Subject to Suit in Foreign Courts?
This report reviews due process limitations on assertions of personal jurisdiction by state and federal courts, and examines how lower courts have applied that law to claims involving the Internet.
Date:
June 25, 2002
Creator:
Jennings, Christopher A.
Object Type:
Report
System:
The UNT Digital Library
Comparison of Zero-Lift Drag Determined by Flight Tests at Transonic Speeds of Pylon, Underslung, and Symmetrically Mounted Nacelles at 40 Percent Semispan of a 45 Degrees Sweptback Wing and Body Combination
Report presenting the effect on drag of varying the vertical position of a nacelle at 40 percent semispan of a 45 degree sweptback wing and body combination as determined by transonic flight tests at zero lift. Three nacelle positions were investigated: a pylon mounted nacelle, an underslung nacelle, and a symmetrically mounted nacelle. Results regarding total drag coefficient and maximum wing-tip helix angle are provided.
Date:
June 25, 1951
Creator:
Hoffman, Sherwood
Object Type:
Report
System:
The UNT Digital Library
Complete Genome Sequence of Coraliomargarita Akajimensis Type Strain (04OKA010-24T)
Coraliomargarita akajimensis Yoon et al. 2007 the type species of the genus Coraliomargarita. C. akajimensis is an obligately aerobic, Gram-negative, non-spore-forming, non-motile, spherical bacterium which was isolated from seawater surrounding the hard coral Galaxea fascicularis. C. akajimensis organism is of special interest because of its phylogenetic position in a genomically purely studied area in the bacterial diversity. Here we describe the features of this organism, together with the complete genome sequence, and annotation. This is the first complete genome sequence of a member of the family Puniceicoccaceae. The 3,750,771 bp long genome with its 3,137 protein-coding and 55 RNA genes is a part of the Genomic Encyclopedia of Bacteria and Archaea project.
Date:
June 25, 2010
Creator:
Mavromatis, Konstantinos; Abt, Birte; Brambilla, Evelyne; Lapidus, Alla; Copeland, Alex; Desphande, Shweta et al.
Object Type:
Article
System:
The UNT Digital Library
Complete Genome Sequence of Denitrovibrio Acetiphilus Type Strain (N2460T)
Denitrovibrio acetiphilus Myhr and Torsvik 2000 is the type species of the genus Denitrovibrio in the bacterial family Deferribacteraceae. It is of phylogenetic interest because there are only six genera described in the family Deferribacteraceae. D. acetiphilus was isolated as a representative of a population reducing nitrate to ammonia in a laboratory column simulating the conditions in off-shore oil recovery fields. When nitrate was added to this column undesirable hydrogen sulfide production was stopped because the sulfate reducing populations were superseded by these nitrate reducing bacteria. Here we describe the features of this marine, mesophilic, obligately anaerobic organism respiring by nitrate reduction, together with the complete genome sequence, and annotation. This is the second complete genome sequence of the order Deferribacterales and the class Deferribacteres, which is the sole class in the phylum Deferribacteres. The 3,222,077 bp genome with its 3,034 protein-coding and 51 RNA genes is part of the Genomic Encyclopedia of Bacteria and Archaea project.
Date:
June 25, 2010
Creator:
Kiss, Hajnalka; Lang, Elke; Lapidus, Alla; Copeland, Alex; Nolan, Matt; Glavina Del Rio, Tijana et al.
Object Type:
Article
System:
The UNT Digital Library
A Complete Scheme for Ionization Cooling for a Muon Collider.
A complete scheme for production and cooling a muon beam for three specified muon colliders is presented. Parameters for these muon colliders are given. The scheme starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Emittance exchange cooling in slow helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further slow helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids using high TC superconductor at 4 K. Preliminary simulations of each element are presented.
Date:
June 25, 2007
Creator:
Palmer, R. B.; Berg, J. S.; Fernow, R. C.; Gallardo, J. C.; Kirk, H. G.; Alexahin, Y. et al.
Object Type:
Article
System:
The UNT Digital Library
Composition and Technical Basis for K Basin Settler Sludge Simulant for Inspection, Retrieval, and Pump Testing
This report provides the formulation and technical basis for a K Basin Settler Tank Sludge simulant that will be used by the K Basin Closure Project (KBC) to test and develop equipment/approaches for Settler Tank sludge level measurement and retrieval in a mock-up test system of the actual Settler Tanks. The sludge simulant may also be used to demonstrate that the TOYO high pressure positive displacement pump design (reversing valves and hollow balls) is suitable for transfer of Settler Tank sludge from the K West (KW) Basin to the Cold Vacuum Drying Facility (CVDF) (~500 ft). As requested the by the K Basins Sludge Treatment Project (STP) the simulant is comprised of non-radioactive (and non-uranium) constituents.
Date:
June 25, 2007
Creator:
Schmidt, Andrew J. & Zacher, Alan H.
Object Type:
Report
System:
The UNT Digital Library
Conceptual Design of the NSLS-II Injection System.
We present the conceptual design of the NSLS-II injection system [1,2]. The injection system consists of a low-energy linac, booster and transport lines. We review two different injection system configurations; a booster located in the storage ring tunnel and a booster housed in a separate building. We briefly discuss main parameters and layout of the injection system components.
Date:
June 25, 2007
Creator:
Shaftan, T.; Rose, T.; Pinayev, I.; Heese, R.; Bengtsson, J.; Skaritka, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Condition of Texas Pavements: Pavement Management Information Systems Annual Report, 2010-2013
Annual report describing the condition of Texas pavements based on distress ratings and ride quality measurements from the Pavement Management Information System (PMIS) during fiscal years 2010-2013. "The report includes the percentage of lane miles in 'Good' or better condition, trends for the major highway systems (IH, US, SH and FM) and pavement types (ACP, CRCP and JCP), trends for pavement distress types and maintenance level of service information" (p. ii).
Date:
June 25, 2013
Creator:
Texas. Department of Transportation.
Object Type:
Report
System:
The Portal to Texas History
Congressional Staff: Duties and Functions of Selected Positions
This report focuses on the duties and functions of staff positions in House and Senate personal offices, and provides sample position descriptions for 14 positions with similar job titles in each chamber. This report is one of several CRS products focusing on various aspects of congressional operations and administration.
Date:
June 25, 2008
Creator:
Petersen, R. Eric
Object Type:
Report
System:
The UNT Digital Library
Conservation and the 2007 Farm Bill
None
Date:
June 25, 2007
Creator:
Zinn, Jeffrey A.
Object Type:
Report
System:
The UNT Digital Library
Cooperative fish rearing projects at Hanford
This presentation details the success of the cooperative efforts to develop fish rearing projects at the Hanford Site, Richland,WA.
Date:
June 25, 1996
Creator:
Betsch, M.D., Westinghouse Hanford
Object Type:
Article
System:
The UNT Digital Library
Cord-Fastener for Envelopes.
Patent for a device for attaching a chord on a merchandise envelope or a similar package that provides "a means for permanently holding one end of the chord in an improved and secure manner, and adapted for temporarily securing the free end when desired" (lines 11-14).
Date:
June 25, 1895
Creator:
Scougale, Malcom
Object Type:
Patent
System:
The Portal to Texas History
Corn-Popper
Patent for a corn popper used for popping corn and general cooking. Illustrations included.
Date:
June 25, 1907
Creator:
Young, G. B.
Object Type:
Patent
System:
The Portal to Texas History
Corn-Popper
Patent for a corn popper. Illustrations included.
Date:
June 25, 1907
Creator:
Young, George B. & Young, Joseph H.
Object Type:
Patent
System:
The Portal to Texas History
Corporate Crime: Preliminary Observations on DOJ's Use and Oversight of Deferred Prosecution and Non-Prosecution Agreements
Testimony issued by the Government Accountability Office with an abstract that begins "Recent cases of corporate fraud and mismanagement heighten the Department of Justice's (DOJ) need to appropriately punish and deter corporate crime. Recently, DOJ has made more use of deferred prosecution and non-prosecution agreements (DPAs and NPAs), in which prosecutors may require company reform, among other things, in exchange for deferring prosecution, and may also require companies to hire an independent monitor to oversee compliance. This testimony provides preliminary observations on (1) factors DOJ considers when deciding whether to enter into a DPA or NPA and setting the terms of the agreements, (2) methods DOJ uses to oversee companies' compliance, (3) processes by which monitors are selected, and (4) companies' perspectives regarding the costs and role of the monitor. It also includes the results of GAO's recently completed work on DOJ's efforts to document the monitor selection process (discussed in objective 3). GAO reviewed DOJ guidance and 57 of the 140 agreements negotiated from 1993 (when the first 2 were signed) through May 2009; and interviewed DOJ officials, officials from 17 companies, and 6 monitors. While not generalizable, these results provide insight into decisions about DPAs and NPAs."
Date:
June 25, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Correlation of point defects in CdZnTe with charge transport:application to room-temperature x-ray and gamma-ray. Final Technical Report
The primary goal of this project has been to characterize and identify point defects (e.g., impurities, vacancies, vacancy-impurity complexes, etc.) in CdZnTe and determine the mechanisms by which these defects influence the carrier {mu}{tau}products. Special attention is given to the role of shallow donors, shallow acceptors, and deeper acceptors. There are two experimental focus areas in the project: (1) liquid-helium photoluminescence (PL) and PL excitation spectroscopy are used to identify and characterize donors and acceptors and to determine zinc molar fraction; and (2) electron paramagnetic resonance (EPR) and photoinduced EPR experiments are performed at liquid-helium temperature to identify paramagnetic point defects and to determine the concentration of these defects. Results from the two experimental focus areas are correlated with detector performance parameters (e.g., electron and hole {mu}{tau} products), crystal growth conditions, and microstructure analyses.
Date:
June 25, 2003
Creator:
Giles, Nancy C.
Object Type:
Report
System:
The UNT Digital Library