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8,297 Matching Results
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Theory and measurement of the electron cloud effect.
Photoelectrons produced through the interaction of synchrotrons radiation and the vacuum chamber walls can be accelerated by a charged particle beam, acquiring sufficient energy to produce secondary electrons (SES) in collisions with the walls. If the secondary-electron yield (SEY) coefficient of the wall material is greater than one, a run-away condition can develop. In addition to the SEY, the degree of amplification depends on the beam intensity and temporal distribution. As the electron cloud builds up along a train of stored bunches, a transverse perturbation of the head bunch can be communicated to trailing bunches in a wakefield-like interaction with the cloud. The electron cloud effect is especially of concern for the high-intensity PEP-II (SLAC) and KEK B-factories and at the Large Hadron Collider (LHC) at CERN. An initiative was undertaken at the Advanced Photon Source (APS) storage ring to characterize the electron cloud in order to provide realistic limits on critical input parameters in the models and improve their predictive capabilities. An intensive research program was undertaken at CERN to address key issues relating to the LHC. After giving an overview, the recent theoretical and experimental results from the APS and the other laboratories will be discussed.
Date:
April 29, 1999
Creator:
Harkey, K. C.
Object Type:
Article
System:
The UNT Digital Library
Total energy cycle energy use and emissions of electric vehicles.
A total energy cycle analysis (TECA) of electric vehicles (EV) was recently completed. The EV energy cycle includes production and transport of fuels used in power plants to generate electricity, electricity generation, EV operation, and vehicle and battery manufacture. This paper summarizes the key assumptions and results of the EVTECA. The total energy requirements of EVS me estimated to be 24-35% lower than those of the conventional, gasoline-fueled vehicles they replace, while the reductions in total oil use are even greater: 55-85%. Greenhouse gases (GHG) are 24-37% lower with EVs. EVs reduce total emissions of several criteria air pollutants (VOC, CO, and NO{sub x}) but increase total emissions of others (SO{sub x}, TSP, and lead) over the total energy cycle. Regional emissions are generally reduced with EVs, except possibly SO{sub x}. The limitations of the EVTECA are discussed, and its results are compared with those of other evaluations of EVs. In general, many of the results (particularly the oil use, GHG, VOC, CO, SO{sub x}, and lead results) of the analysis are consistent with those of other evaluations.
Date:
April 29, 1999
Creator:
Singh, M. K.
Object Type:
Article
System:
The UNT Digital Library
Year 2000 Computing Challenge: Status of Emergency and State and Local Law Enforcement Systems Is Still Unknown
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the: (1) impact of the year 2000 challenge on the nation's emergency and state and local law enforcement systems; and (2) Department of Justice (DOJ) and the President's Council on Year 2000 Conversion efforts to facilitate remediation and contingency planning and to gauge the year 2000 readiness of these two important sectors."
Date:
April 29, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Antimicrobial Resistance: Data to Assess Public Health Threat From Resistant Bacteria Are Limited
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the potential threat to the public's health from antimicrobial resistant bacteria, focusing on: (1) what is known about the public health burden--in terms of illnesses, deaths and treatment costs--due to antimicrobial resistance; (2) potential future burden, given what is known about the development of resistance in microbes and usage of antimicrobials; and (3) federal efforts to gather and provide information about resistance."
Date:
April 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Appropriations for FY1999: An Overview
None
Date:
April 28, 1999
Creator:
Anderson, J. Michael
Object Type:
Report
System:
The UNT Digital Library
Appropriations for FY1999: An Overview
Appropriations are one part of a complex federal budget process that includes budget resolutions, appropriations (regular, supplemental, and continuing) bills, rescissions, and budget reconciliation bills. This report is a guide to CRS reports that provide analytical perspectives on the 13 annual appropriations bills, and other related appropriation measures. It does not include a detailed explanation or description of the budget or appropriations processes.
Date:
April 28, 1999
Creator:
Anderson, J. Michael
Object Type:
Report
System:
The UNT Digital Library
Bunch compressor and de-compressor in the FEL for satellite power beaming
A FEL of average power 200 kW is being designed at the LBNL for satellite power beaming. It utilizes the radiation of {approximately} 100 MeV electrons with {approximately} 200 A peak current. In order to obtain the desired peak current, the 5mm long electron bunches delivered by a linear accelerator are compressed to 1mm. Furthermore, it is important for the FEL operations that the compressed bunches have a uniform longitudinal density distribution over the entire bunch length. After the FEL, the electron beam is returned to the linear accelerator for deceleration. Since the electron beam acquires approximately 6% energy spread during radiation in the FEL, bunch de-compressor is used between the FEL and the linac to expand the electron bunches back to their original length and to reduce the energy spread. In this paper we present design and analysis of the bunch compressor and the bunch de-compressor that perform needed functions.
Date:
April 28, 1999
Creator:
Wan, A. Zholents and W.
Object Type:
Article
System:
The UNT Digital Library
Environmental Assessment and Finding of No Significant Impact: Implementation of the Wetland Mitigation Bank Program at the Savannah River Site
The Department of Energy (DOE) has prepared an environmental assessment (EA) (DOE/EA-1205) for the proposed implementation of a wetland mitigation bank program at the Savannah River Site (SRS), located near Aiken, South Carolina. Based on the analyses in the EA, DOE has determined that the proposed action is not a major Federal action significantly affecting the quality of the human environment within the meaning of the National Environmental Policy Act of 1969 (NEPA). Therefore, the preparation of an environmental impact statement (EIS) is not required, and DOE is issuing this Finding of No Significant Impact (FONSI) and Floodplain Statement of Findings.
Date:
April 28, 1999
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Financial Audit: MedPAC's Fiscal Year 1998 Schedules of Expenditures and Budgetary Resources
A letter report issued by the General Accounting Office with an abstract that begins "GAO reported on the results of the financial-related audit, conducted by KPMG Peat Marwick LLP, of the Medicare Payment Advisory Commission's (MedPAC) Schedules of Expenditures and Budgetary Resources for the year ended September 30, 1998."
Date:
April 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Flavor tagging nd CP-violation measurements at the Tevatron
The CDF collaboration has adapted several heavy flavor tagging techniques and employed them in analyses of time-dependent flavor asymmetries using data from the Tevatron Run I. The tagging algorithms were calibrated using low-P{sub t} inclusive lepton and dilepton trigger data samples. The tagging techniques were applied to a sample of {approximately} 400 B{sub d}{sup 0}/{anti B}{sub d}{sup 0} {r_arrow} J/{psi}K{sub s}{sup 0} decays and were used to measure the CP violation parameter, sin(2{beta}). Prospects for future improved measurements of the CP violation parameters at the Tevatron are briefly discussed.
Date:
April 28, 1999
Creator:
Tkaczyk, S.
Object Type:
Article
System:
The UNT Digital Library
Food Safety: The Agricultural Use of Antibiotics and Its Implications for Human Health
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on antibiotic resistance issues that may stem from the use of antibiotics in agriculture, focusing on the: (1) use of antibiotics in agriculture and the implications of that use for human health; (2) federal roles and responsibilities for overseeing the use of antibiotics in agriculture; and (3) issues surrounding the debate over whether to further regulate or restrict the use of antibiotics in agriculture."
Date:
April 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Fracture characterization of the large-block test, Fran Ridge, Yucca Mountain, Nevada
The US Department of Energy (DOE) is investigating the suitability of Yucca Mountain as a potential site for the nation's first high-level nuclear waste repository. The site is located about 120 km northwest of Las Vegas, Nevada, at the Nevada Test Site. Favorable aspects of Yucca Mountain as a potential repository site include its arid nature and the sorptive properties of the rock materials. The arid environment results in unsaturated conditions at the potential emplacement horizon, which is the Topopah Spring tuff of the Paintbrush Group. The Large Block Test (LBT) was designed to be one of a series of tests at different scales and conditions that assist in defining the physical processes that need to be considered in models of a potential repository in Yucca Mountain. The LBT is a critical test because it is of sufficient size to incorporate a fracture system that is representative of the distribution of fracture dimensions and characteristics--with the exception of major structures, such as faults--that would likely be present in a repository. The LBT location was chosen to include large, through-going fractures as well as small, healed fractures that are of limited extent. The LBT location also includes a variety of fracture …
Date:
April 28, 1999
Creator:
Wagoner, J.L.
Object Type:
Report
System:
The UNT Digital Library
Fresh Produce: Potential Consequences of Country-of-Origin Labeling
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the labelling requirements for fresh produce, focusing on: (1) the potential costs associated with the compliance and enforcement of a mandatory country-of-origin labelling requirement at the retail level for fresh produce; (2) the potential trade issues associated with such a requirement; (3) the potential impact of such a requirement on the ability of the federal government and the public to respond to outbreaks of illness caused by contaminated fresh produce; and (4) consumers' views of country-of-origin labelling."
Date:
April 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Increased Oil Production and Reserves from Improved Completion Techniques in the Bluebell Field, Uinta Basin, Utah
The objective of the project is to increase oil production and reserves by the use of improved reservoir characterization and completion techniques in the Uinta Basin, Utah. To accomplish this objective, a two-year geologic and engineering characterization of the Bluebell field was conducted. The study evaluated surface and subsurface data, currently used completion techniques, and common production problems. It was determined that advanced case- and open-hole logs could be effective in determining productive beds and that stage-interval (about 500 ft [150 m] per stage) and bed-scale isolation completion techniques could result in improved well performance. In the first demonstration well (Michelle Ute well discussed in the previous technical report), dipole shear anisotropy (anisotropy) and dual-burst thermal decay time (TDT) logs were run before and isotope tracer log was run after the treatment. The logs were very helpful in characterizing the remaining hydrocarbon potential in the well. But, mechanical failure resulted in a poor recompletion and did not result in a significant improvement in the oil production from the well.
Date:
April 28, 1999
Creator:
Deo, M. D. & Morgan, C. D.
Object Type:
Report
System:
The UNT Digital Library
Indian Trust Funds: Interior Lacks Assurance That Trust Improvement Plan Will Be Effective
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO evaluated the Department of the Interior's High-Level Implementation Plan for improving its management of the Indian trust funds and resources under its control, focusing on whether the Interior has reasonable assurance that: (1) the High-Level Plan provides an effective solution for addressing its long-standing problems; and (2) its acquisition of a new asset and land records management service will cost effectively satisfy trust management needs."
Date:
April 28, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Kosovo and NATO: Selected Issues of International Law
None
Date:
April 28, 1999
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
Multi-Bunch Instability Diagnostics via Digital Feedback Systems at PEP-II, DAFNE, ALS and SPEAR
Longitudinal feedback systems based on a common programmable DSP architecture have been commissioned at 4 laboratories. In addition to longitudinal feedback and beam diagnostics these flexible systems have been programmed to provide diagnostics for transverse motion. The diagnostic functions are based on transient domain techniques which record the response of every bunch while the feedback system manipulates the beam. Operational experience from 4 installations is illustrated via experimental results from PEP-II, DAFNE, ALS and SPEAR. Modal growth and damping rates for transverse and longitudinal planes are measured via short (20 ms) transient excitations for unstable and stable coupled-bunch modes. Data from steady-state measurements are used to identify unstable modes, noise-driven beam motion, and noise sources. Techniques are illustrated which allow the prediction of instability thresholds from low-current measurements of stable beams. Transverse bunch train grow-damp sequences which measure the time evolution of instabilities along the bunch train are presented and compared to signatures expected from ion and fast ion instabilities.
Date:
April 28, 1999
Creator:
Fox, John D
Object Type:
Report
System:
The UNT Digital Library
Nuclear excitation by electronic transition (NEET).
We present a report on recent measurements using the Advanced Photon Source at Argonne National Laboratory to explore the phenomenon of Nuclear Excitation by Electronic Transition (NEET) in the {sup 189}Os atomic/nuclear system.
Date:
April 28, 1999
Creator:
Ahmad, I.; Dunford, R. W.; Esbensen, H.; Gemmell, D. S.; Kanter, E. P.; Kraessig, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Overture: object-oriented tools for overset grid applications
The Overture framework is an object-oriented environment for solving partial differential equations in two and three space dimensions. It is a collection of C++ libraries that enables the use of finite difference and finite volume methods at a level that hides the details of the associated data structures. Overture can be used to solve problems in complicated, moving geometries using the method of overlapping grids. It has support for grid generation, difference operators, boundary conditions, data-base access and graphics. Short sample code segments are presented to show the power of this approach.
Date:
April 28, 1999
Creator:
Brown, D L; Henshaw, W D & Quinlan, D J
Object Type:
Article
System:
The UNT Digital Library
Reservoir Characterization, Production Characteristics, and Research Needs for Fluvial/Alluvial Reservoirs in the United States
The Department of Energy's (DOE's) Oil Recovery Field Demonstration Program was initiated in 1992 to maximize the economically and environmentally sound recovery of oil from known domestic reservoirs and to preserve access to this resource. Cost-shared field demonstration projects are being initiated in geology defined reservoir classes which have been prioritized by their potential for incremental recovery and their risk of abandonment. This document defines the characteristics of the fifth geological reservoir class in the series, fluvial/alluvial reservoirs. The reservoirs of Class 5 include deposits of alluvial fans, braided streams, and meandering streams. Deposit morphologies vary as a complex function of climate and tectonics and are characterized by a high degree of heterogeneity to fluid flow as a result of extreme variations in water energy as the deposits formed.
Date:
April 28, 1999
Creator:
Cole, E. L.; Fowler, M. L.; Jackson, S. R.; Madden, M. P.; Raw-Schatzinger, V.; Salamy, S. P. et al.
Object Type:
Report
System:
The UNT Digital Library
Texas Attorney General Opinion: JC-37
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, John Cornyn, regarding a legal question submitted for clarification: How a school district should determine that a design/build contract will provide the school district with the best value for purposes of Education Code section 44.031(a), and related questions (RQ-870)
Date:
April 28, 1999
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: JC-38
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, John Cornyn, regarding a legal question submitted for clarification: Authority of the Secretary of State to adopt rules restricting use of state funds for voter registration under chapter 19 of the Election Code (RQ-524)
Date:
April 28, 1999
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Thermodynamics and stability of the mixed-conducting Sr-Fe-Co-O system.
Mixed-conducting Sr-Fe-Co oxides have potential applications in dense ceramic membranes for high-purity oxygen separation and/or methane conversion to produce syngas (CO + H{sub 2}), because of their combined high electronic/ionic conductivity and significant oxygen permeability. We studied the crystal structure and microstructure of the system in X-ray diffraction experiments and by using scanning electron microscopy, respectively. Thermogravimetric analysis was conducted on the SrFeCo{sub 0.5}O{sub x} sample in environments of various oxygen partial pressures (pO{sub 2}). Conductivity increased while weight decreased with increasing temperature. Activation energy decreased while conductivity increased with increasing pO{sub 2}. The pO{sub 2}-dependent conducting behavior of the SrFeCo{sub 0.5}O{sub x} system can be understood by considering the trivalent-to-divalent transition of transition-metal ions.
Date:
April 28, 1999
Creator:
Ma, B.
Object Type:
Article
System:
The UNT Digital Library
TREATMENT OF METAL-LADEN HAZARDOUS WASTES WITH ADVANCED CLEAN COAL TECHNOLOGY BY-PRODUCTS
This thirteenth quarterly report describes work done during the thirteenth three-month period of the University of Pittsburgh's project on the ''Treatment of Metal-Laden Hazardous Wastes with Advanced Clean Coal Technology By-Products.'' This report describes the activities of the project team during the reporting period. The principal work has focused upon new laboratory evaluation of samples from Phase 1, discussions with MAX Environmental Technologies, Inc., on the field work of Phase 2, preparing and giving presentations, and making and responding to a number of outside contacts.
Date:
April 28, 1999
Creator:
James T. Cobb, Jr.; Neufeld, Ronald D. & Agostini, Jana
Object Type:
Report
System:
The UNT Digital Library