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438 Matching Results
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More than just wires : applying complexity theory to communications network assurance.
Complexity Theory is the study of order within otherwise chaotic systems (Holland, 1999). Complexity Theory often focuses on Complex Adaptive Systems (CAS). A CAS is a system of components that interact and reproduce while adapting to their environment. A CAS consists of large numbers of components that are diverse in both form and capability. A CAS exhibits unstable coherence in spite of constant disruptions and a lack of central planning. Large-scale, interconnected infrastructures such as communication networks are CAS. These infrastructures are vastly more dynamic than their predecessors. Such infrastructures consist of a large number of components and participants that are diverse in both form and capability. Furthermore, these infrastructures exhibit unstable coherence in spite of constant disruptions and a lack of central planning. Viewing large-scale, interconnected infrastructures with complex physical architectures, such as communication networks, as CAS can provide many new insights (Bower and Bunn, 2000; North, 2000a, 2000b, and 2001). The CAS approach emphasizes the specific evolution of integrated infrastructures and their participants' behavior, not just simple trends or end states. The adaptation of the infrastructure participants to changing conditions is paramount. Also, the effects of random events and uncertainty are explicitly considered. One powerful computational approach to …
Date:
September 5, 2002
Creator:
North, M.; Macal, C.; Thomas, W. H.; Miller, D. & Peerenboom, J.
Object Type:
Article
System:
The UNT Digital Library
INTERNATIONAL UNION OF OPERATING ENGINEERS NATIONAL HAZMAT PROGRAM - MILWAUKEE WORM DRIVE CIRCULAR SAW OENHP{number_sign}: 2001-02, VERSION A
Florida International University's (FIU) Hemispheric Center for Environmental Technology (HCET) evaluated five saws for their effectiveness in cutting specially prepared fiberglass-reinforced plywood crates. These crates were built as surrogates for crates that presently hold radioactively contaminated glove boxes at the Department of Energy's (DOE) Los Alamos facility. The Milwaukee worm drive circular saw was assessed on August 14, 2001. During the FIU test of efficacy, a team from the Operating Engineers National Hazmat Program (OENHP) evaluated the occupational safety and health issues associated with this technology. The Milwaukee worm drive circular saw is a hand-held tool with a 7 1/4-inch diameter circular blade for cutting wood. The saw contains a fixed upper and a retractable lower blade guard to prevent access to the blade during use. The unit is operated with an on/off guarded trigger switch; and is supported with a handgrip mounted on top of the saw. An adjustable lever sets the depth of cut. The retractable blade guard permits blind or plunge cuts and protects from blade access during shutdown and blade coast. Kickback, the sudden reaction to a pinched blade, is possible when using this saw and could cause the saw to lift up and out of …
Date:
January 5, 2002
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Intergenerational equity and long-term stewardship plans.
For an untold number of contaminated sites throughout the world, stewardship will be inevitable. For many such sites, stewardship will be a reasonable approach because of the uncertainties associated with present and future site conditions and site contaminants, the limited performance of available technologies, the nonavailability of technologies, and the risk and cost associated with complete cleanup. Regardless of whether stewardship is a realistic approach to site situations or simply a convenient default, it could be required at most contaminated sites for multiple generations. Because the stewardship plan is required to protect the release of hazardous contaminants to the environment, some use restrictions will be put in place to provide that protection. These use restrictions will limit access to resources for as long as the protection is required. The intergenerational quality of long-term stewardship plans and their inherent limitations on resource use require that they be designed to achieve equity among the affected generations. Intergenerational equity, defined here as the fairness of access to resources across generations, could be achieved through a well-developed stewardship plan that provides future generations with the information they need to make wise decisions about resource use. Developing and implementing such a plan would take into …
Date:
February 5, 2002
Creator:
Hocking, E. K.
Object Type:
Article
System:
The UNT Digital Library
National Spherical Torus Experiment Real Time Plasma Control Data Acquisition Hardware
The National Spherical Torus Experiment (NSTX) is currently providing researchers data on low aspect-ratio toroidal plasmas. NSTX's Plasma Control System adjusts the firing angles of thyristor rectifier power supplies, in real time, to control plasma position, shape and density. A Data Acquisition system comprised of off-the-shelf and custom hardware provides the magnetic diagnostics data required in calculating firing angles. This VERSAmodule Eurocard (VME) bus-based system utilizes Front Panel Data Port (FPDP) for high-speed data transfer. Data coming from physically different locations is referenced to several different ground potentials necessitating the need for a custom FPDP multiplexer. This paper discusses the data acquisition system configuration, the in-house designed 4-to-1 FPDP Input Multiplexing Module (FIMM), and future expansion plans.
Date:
August 5, 2002
Creator:
Marsala, R. J. & Schneider, J.
Object Type:
Report
System:
The UNT Digital Library
Effect of small-scale fractures on flow and transport processes at Yucca Mountain, Nevada
Although many conceptual models for fracture-matrix interaction have been evaluated for Yucca Mountain site-characterization studies, the most widely used model is currently based on the dual-permeability concept. It was chosen for use in site-characterization partially because it has proved to be capable of matching many types of field observed data. Another consideration is that net infiltration rates at the site are estimated to be very low (on the order of millimeters/year), or close to saturated matrix hydraulic conductivity. Recent field studies and tests, in particular, fracture mapping data, collected along the walls of the underground tunnels reveal that there exists a significantly large variety in fracture sizes from centimeters to tens of meters. There is a considerable amount of small-scale fractures that have not been considered in the previous modeling studies. Although the majority of these small fractures may not contribute much to global flow and transport through the fracture-matrix system, they may provide large amounts of storage pore space and allow for additional connection areas for well-connected, large-scale fractures and surrounding matrix blocks, which ultimately affect fracture-matrix interactions. However, the currently used dual-permeability model is unable to include the potentially important effect of small fractures. To overcome the limitations …
Date:
December 5, 2002
Creator:
Wu, Yu-Shu; Liu, H.H. & Bodvarsson, G.S.
Object Type:
Article
System:
The UNT Digital Library
BSW Well Evaluation Report
The BSW series wells are located in the Mixed Waste Management Facility and are part of the groundwater monitoring program at Savannah River Site. These wells have had persistent problems that prevent successful sampling that dates back to their installation. Only thirty-two of the fifty-three BSW wells were successfully sampled during 4th quarter, 2001. These problems were previously investigated by looking at field sampling logbooks from 4th quarter 2001 and other background information to try to identify causes for the high rate of sampling failure. Several possible causes were identified and reported in memorandum, SRT-EST-2002-00059. The memorandum recommended that an evaluation be performed on each well to identify problems and their causes and to correct them when possible. Environmental Restoration Division followed up on this recommendation and requested Savannah River Technology Center to perform an evaluation. This report includes the results of the evaluation performed on the BSW wells.
Date:
September 5, 2002
Creator:
Noonkester, J.V.
Object Type:
Report
System:
The UNT Digital Library
Nuclear transitions induced by synchrotron x-rays.
We discuss two rare but interesting processes by which synchrotron x-rays with energies up to about 100 keV may be used to induce nuclear transitions. In the NEET (Nuclear Excitation by Electronic Transition) process, an intense x-ray beam is employed to make vacancies, e.g. K-holes, in the atoms of a specific nuclear isotope. When a vacancy is filled by an electronic transition from a higher atomic level, there is some probability that instead of the usual x-ray or Auger emission, the nucleus of the atom itself will be excited. This is then followed by a nuclear decay exhibiting characteristic gamma-rays or other types of radiation, with time delays typical of the nuclear states involved. The probability for NEET increases when the energies of the atomic and the nuclear transitions become close. We address some theoretical aspects of the process and describe experimental efforts to observe it in {sup 189}Os and {sup 197}Au. The second process to be discussed is the possibility of ''triggering'' the decay of a nuclear isomer by irradiation with an x-ray beam. We focus on the case of the 31-year, 2.4-MeV, 16+ isomer of {sup 178}Hf. There has been speculation that if one could isolate gram quantities, …
Date:
June 5, 2002
Creator:
Gemmell, D. S.
Object Type:
Article
System:
The UNT Digital Library
Radiation levels experienced by the insertion devices of the third-generation synchrotron radiation sources.
None
Date:
June 5, 2002
Creator:
Job, P. K. & Alderman, J.
Object Type:
Article
System:
The UNT Digital Library
Multi-agent electricity market modeling with EMCAS.
Electricity systems are a central component of modern economies. Many electricity markets are transitioning from centrally regulated systems to decentralized markets. Furthermore, several electricity markets that have recently undergone this transition have exhibited extremely unsatisfactory results, most notably in California. These high stakes transformations require the introduction of largely untested regulatory structures. Suitable tools that can be used to test these regulatory structures before they are applied to real systems are required. Multi-agent models can provide such tools. To better understand the requirements such as tool, a live electricity market simulation was created. This experience helped to shape the development of the multi-agent Electricity Market Complex Adaptive Systems (EMCAS) model. To explore EMCAS' potential, several variations of the live simulation were created. These variations probed the possible effects of changing power plant outages and price setting rules on electricity market prices.
Date:
September 5, 2002
Creator:
North, M.; Macal, C.; Conzelmann, G.; Koritarov, V.; Thimmapuram, P. & Veselka, T.
Object Type:
Article
System:
The UNT Digital Library
Initial test results of an ionization chamber shower detector for a LHC luminosity monitor
A novel, segmented, multi-gap, pressurized gas ionization chamber is being developed for optimization of the luminosity of the LHC. The ionization chambers are to be installed in the front quadrupole and zero degree neutral particle absorbers in the high luminosity IRs and sample the energy deposited near the maxima of the hadronic/electromagnetic showers in these absorbers. The ionization chambers are instrumented with low noise, fast, pulse shaping electronics to be capable of resolving individual bunch crossings at 40 MHz. In this paper we report the initial results of our second test of this instrumentation in an SPS external proton beam. Single 300 GeV protons are used to simulate the hadronic/electromagnetic shower produced by the forward collision products from the interaction regions of the LHC. The capability of instrumentations to measure the luminosity of individual bunches in a 40 MHz bunch train is demonstrated.
Date:
November 5, 2002
Creator:
Datte, P.; Beche, J.-F.; Haguenauer, M.; Manfredi, P.F.; Manghisoni, M.; Millaud, J. et al.
Object Type:
Article
System:
The UNT Digital Library
The Development and Application of SCDAP-3D
The SCDAP-3D computer code (Coryell 2001) has been developed at the Idaho National Engineering and Environmental Laboratory (INEEL) for the analysis of severe reactor accidents. A prominent feature of SCDAP-3D relative to other versions of the code is its linkage to the state-of-the-art thermal/hydraulic analysis capabilities of RELAP5-3D. Enhancements to the severe accident models include the ability to simulate high burnup and alternative fuel, as well as modifications to support advanced reactor analyses, such as those described by the Department of Energy's Generation IV (GenIV) initiative. Initial development of SCDAP-3D is complete and two widely varying but successful applications of the code are summarized. The first application is to large break loss of coolant accident analysis performed for a reactor with alternative fuel, and the second is a calculation of International Standard Problem 45 (ISP-45) or the QUENCH 6 experiment.
Date:
March 5, 2002
Creator:
Coryell, E. W.; Harvego, E. A. & Siefken, L. J.
Object Type:
Article
System:
The UNT Digital Library
Post Waterflood CO2 Miscible Flood in Light Oil, Fluvial-Dominated Deltaic Reservoir (Pre-Work and Project Proposal), Class I
This project outlines a proposal to improve the recovery of light oil from waterflooded fluvial dominated deltaic (FDD) reservoir through a miscible carbon dioxide (CO2) flood. The site is the Port Neches Field in Orange County, Texas. The field is well explored and well exploited. The project area is 270 acres within the Port Neches Field.
Date:
February 5, 2002
Creator:
Bou-Mikael, Sami
Object Type:
Report
System:
The UNT Digital Library
NOx, FINE PARTICLE AND TOXIC METAL EMISSIONS FROM THE COMBUSTION OF SEWAGE SLUDGE/COAL MIXTURES: A SYSTEMATIC ASSESSMENT
This research project focuses on pollutants from the combustion of mixtures of dried municipal sewage sludge (MSS) and coal. The objective is to determine the relationship between (1) fraction sludge in the sludge/coal mixture, and (2) combustion conditions on (a) NO{sub x} concentrations in the exhaust, (b) the size segregated fine and ultra-fine particle composition in the exhaust, and (c) the partitioning of toxic metals between vapor and condenses phases, within the process. To this end work is progress using an existing 17kW downflow laboratory combustor, available with coal and sludge feed capabilities. The proposed study will be conducted in concert with an existing ongoing research on toxic metal partitioning mechanisms for very well characterized pulverized coals alone. Both high NO{sub x} and low NO{sub x} combustion conditions will be investigated (unstaged and staged combustion). The proposed work uses existing analytical and experimental facilities and draws on 20 years of research on NO{sub x} and fine particles that has been funded by DOE in this laboratory. Four barrels of dried sewage sludge are currently in the laboratory. Insofar as possible pertinent mechanisms will be elucidated. Tradeoffs between CO{sub 2} control, NO{sub x} control, and inorganic fine particle and toxic metal …
Date:
February 5, 2002
Creator:
Wendt, Jost O.L.
Object Type:
Report
System:
The UNT Digital Library
A real application of the model coupling toolkit.
None
Date:
February 5, 2002
Creator:
Ong, E. T.; Larson, J. W. & Jacaob, R. L.
Object Type:
Article
System:
The UNT Digital Library
Beam Effects from an Increase of LINAC Current from 40 ma to 49 Milliamperes
On March 25, 2002 the FNAL Linac had been running at a decreased 40 ma of beam current for some time. Both the 400 MeV Linac and the 8GeV Booster had been tuned to optimum running during that time. Optimum running for the Booster was at 4.1e12 per pulse. Losses at injection and at transition were limiting intensity at the time. By March 26, 2002 the Linac beam current had been increased to 49 ma. The optimum Booster intensity immediately jumped to 4.5e12 per pulse and increased in the next few days to 4.8e12 and 5e12 per pulse. Booster was not retuned until early April when a low-loss 5.0e12 was obtained for stacking operations. Linac current had sagged to 47 ma by then. Measurements were made on the 25th at 40 ma and the 26th and 27th at 49 ma. This is a report and discussion of those measurements.
Date:
June 5, 2002
Creator:
Tomlin, Ray
Object Type:
Report
System:
The UNT Digital Library
The dynamic information architecture system : a simulation framework to provide interoperability for process models.
As modeling and simulation becomes a more important part of the day-to-day activities in industry and government, organizations are being faced with the vexing problem of how to integrate a growing suite of heterogeneous models both within their own organizations and between organizations. The Argonne National Laboratory, which is operated by the University of Chicago for the United States Department of Energy, has developed the Dynamic Information Architecture System (DIAS) to address such problems. DIAS is an object-oriented, subject domain independent framework that is used to integrate legacy or custom-built models and applications. In this paper we will give an overview of the features of DIAS and give examples of how it has been used to integrate models in a number of applications. We shall also describe some of the key supporting DIAS tools that provide seamless interoperability between models and applications.
Date:
February 5, 2002
Creator:
Hummel, J. R. & Christiansen, J. H.
Object Type:
Article
System:
The UNT Digital Library
K (transverse) jet algorithms in hadron colliders: The D0 experience
D0 has implemented and studied a k{sub {perpendicular}} jet algorithm for the first time in a hadron collider. The authors have submitted two physics results for publication: the subjet multiplicity in quark and gluon jets and the central inclusive jet cross section measurements. A third result, a measurement of thrust distributions in jet events, is underway. A combination of measurements using several types of algorithms and samples taken at different center-of-mass energies is desirable to understand and distinguish with higher accuracy between instrumentation and physics effects.
Date:
December 5, 2002
Creator:
Elvira, V. Daniel
Object Type:
Article
System:
The UNT Digital Library
Status of LOCA research in high burnup cladding performance program.
None
Date:
March 5, 2002
Creator:
Billone, M. C.; Strain, R. V. & Yan, Y.
Object Type:
Article
System:
The UNT Digital Library
Design of High Explosive Pulsed Power Systems for 20 MB Isentropic Compression Experiments
None
Date:
July 5, 2002
Creator:
Goforth, J. H.; Atchison, W. L.; Fowler, C. M.; Kienigs, R. K.; Oona, H.; Tasker, D. G. et al.
Object Type:
Article
System:
The UNT Digital Library
Comparison of MTI and Ground Truth Sea Surface Temperatures at Nauru
This report evaluates MTI-derived surface water temperature near the tropical Pacific island of Nauru. The MTI sea-surface temperatures were determined by the Los Alamos National Laboratory based on the robust retrieval.
Date:
September 5, 2002
Creator:
Kurzeja, R.
Object Type:
Report
System:
The UNT Digital Library
A cosmic perspective from Lapland in 2001
A convergence of ideas, observations and technology have led to the greatest period of cosmological discovery yet. Over the past three years we have determined the basic features of our Universe. We are now challenged to make sense of what we have found. The outcome of planned experiments and observations as well as new ideas will be required. If we succeed, ours truly will be a Golden Age of Cosmology.
Date:
December 5, 2002
Creator:
Turner, Michael s.
Object Type:
Article
System:
The UNT Digital Library
Report of the Snowmass T4 working group on particle sources: Positron sources, anti-proton sources and secondary beams
This report documents the activities of the Snowmass 2001 T4 Particle Sources Working Group. T4 was charged with examining the most challenging aspects of positron sources for linear colliders and antiproton sources for proton-antiproton colliders, and the secondary beams of interest to the physics community that will be available from the next generation of high-energy particle accelerators. The leading issues, limiting technologies, and most important R and D efforts of positron production, antiproton production, and secondary beams are discussed in this paper. A listing of T4 Presentations is included.
Date:
December 5, 2002
Creator:
al., N. Mokhov et
Object Type:
Article
System:
The UNT Digital Library
Technetium Removal from Hanford and Savannah River Site Actual Tank Waste Supernates with SuperLig(R) 639 Resin
SuperLig(R) 639 elutable, organic resin has been selected for technetium (as pertechnetate ion) removal from Hanford Site radioactive waste samples as part of the River Protection Project - Waste Treatment Plant (RPP-WTP) design. In support of the RPP-WTP flow sheet development, column tests have been performed at the Savannah River Technology Center with SuperLig(R) 639 resin using actual Hanford Site tank waste samples. The resin was shown to be highly effective at pertechnetate removal from these caustic, high-sodium, aqueous waste samples. Pertechnetate ion was subsequently eluted from the columns with water. An additional column test conducted on a Savannah River Site waste sample revealed exceptional performance, presumably due to the fact that lower concentrations of competing anions (primarily nitrate) were present in the sample.
Date:
September 5, 2002
Creator:
King, W.D.
Object Type:
Article
System:
The UNT Digital Library
Parameters of an E+ E- collider in the VLHC tunnels
The authors have discussed the option of building an e{sup +}e{sup -} collider in the tunnels of the VLHC in a number of notes [1,2,3,4,5]. Continued study of this option has shown that the operating range of the machine can be extended somewhat from previous papers and this note presents the most recent progress on the luminosity and high energy operation of this machine. They have assumed that this machine would be used to justify the construction of a tunnel which would eventually house the VLHC collider, and perhaps ultimately an ep collider.
Date:
December 5, 2002
Creator:
al., T. Sen et
Object Type:
Article
System:
The UNT Digital Library