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493 Matching Results
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Comparison of two up-scaling methods in poroelasticity and its generalizations
Two methods of up-scaling coupled equations at the microscale to equations valid at the mesoscale and/or macroscale for fluid-saturated and partially saturated porous media are discussed, compared, and contrasted. The two methods are: (1) two-scale and multiscale homogenization, and (2) volume averaging. Both these methods have advantages for some applications and disadvantages for others. For example, homogenization methods can give formulas for coefficients in the up-scaled equations, whereas volume averaging methods give the form of the up-scaled equations but generally must be supplemented with physical arguments and/or data in order to determine the coefficients. Homogenization theory requires a great deal of mathematical insight from the user in order to choose appropriate scalings for use in the resulting power-law expansions, while volume averaging requires more physical insight to motivate the steps needed to find coefficients. Homogenization often is performed on periodic models, while volume averaging does not require any assumption of periodicity and can therefore be related very directly to laboratory and/or field measurements. Validity of the homogenization process is often limited to specific ranges of frequency - in order to justify the scaling hypotheses that must be made - and therefore cannot be used easily over wide ranges of frequency. …
Date:
March 16, 2004
Creator:
Berger, E. L.
Object Type:
Article
System:
The UNT Digital Library
Computer Security: A Summary of Selected Federal Laws, Executive Orders, and Presidential Directives
This report provides a short summary of selected federal laws, executive orders, and presidential directives, currently in force, that govern computer security. The report focuses on the major roles and responsibilities assigned various federal agencies in the area of computer security.
Date:
April 16, 2004
Creator:
Moteff, John D.
Object Type:
Report
System:
The UNT Digital Library
Conditions Conducive to Forming Crystalline Uranyl Silicates in High Caustic Nuclear Waste Evaporators
The laboratory conditions used to synthesize the uranyl silicate minerals are almost identical to the evaporator conditions under which high caustic nuclear wastes are processed to reduce total liquid waste volume. The only significant difference lies in the sodium ion concentration in such caustic nuclear wastes, which typically averages around 5.6 M Na+. In this investigation, synthetic uranyl silicate minerals (sodium weeksite, sodium boltwoodite and uranophane) were produced only under low Na+ concentration (less than 0.02 M), while attempts to synthesize these same uranyl silicates minerals in the presence of high Na+ concentration (high ionic strength reacting media), which is typical of caustic nuclear waste evaporator processing conditions proved unfruitful. In the presence of high Na+ concentration the main product for the same soluble silica-uranium reaction mixture shifts towards the formation of mainly clarkeite (Na[(UO2)O(OH)](H2O)0-1), a hydrated sodium uranate and not to wards the formation of uranyl silicates. Thus, the presence of high Na+ concentration in the reaction mixture of dissolved uranium and silica inhibits or suppresses the formation of crystalline uranyl silicates. We therefore conclude that evaporator fouling by uranyl silicate minerals is not easily produced under nuclear waste processing conditions because of the high Na+ concentration in the …
Date:
November 16, 2004
Creator:
OJI, LAWRENCE
Object Type:
Report
System:
The UNT Digital Library
Consolidation Loan Provisions in the Federal Family Education Loan and Direct Loan Programs
This report provides comprehensive descriptive information on major provisions of the law pertaining to the consolidation loans available to federal student loan borrowers through the FFEL and DL programs.
Date:
November 16, 2004
Creator:
Stoll, Adam
Object Type:
Report
System:
The UNT Digital Library
Cooper Review (Cooper, Tex.), Vol. 124, No. 38, Ed. 1 Thursday, September 16, 2004
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
September 16, 2004
Creator:
Pinson, Beth
Object Type:
Newspaper
System:
The Portal to Texas History
Cooper Review (Cooper, Tex.), Vol. 124, No. 51, Ed. 1 Thursday, December 16, 2004
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
December 16, 2004
Creator:
Pinson, Beth
Object Type:
Newspaper
System:
The Portal to Texas History
The Copyright Royalty and Distribution Reform Act of 2004
None
Date:
December 16, 2004
Creator:
Jeweler, Robin
Object Type:
Report
System:
The UNT Digital Library
Core Plasma Charge States of Mo Ions in High Electron Temperature JET and FTU Plasmas
None
Date:
June 16, 2004
Creator:
Mattioli, M; Carraro, L; Bortolon, A; Coffey, I; Finkenthal, M; Fournier, K et al.
Object Type:
Article
System:
The UNT Digital Library
Corporation For National And Community Service: Better Internal Control and Revised Practices Would Improve the Management of AmeriCorps and the National Service Trust
A letter report issued by the General Accounting Office with an abstract that begins "The Corporation for National and Community Service (the Corporation) was created to help meet community needs and expand educational opportunity by providing education awards to participants. The Corporation oversees and funds the AmeriCorps program as well as the National Service Trust (the Trust), which pays the education awards. From November 2002 to March 2003 the Corporation suspended AmeriCorps enrollments because there would not have been sufficient funds in the Trust to pay education awards. GAO was asked to determine (1) if all AmeriCorps enrollments were accurately recorded, (2) how the Corporation estimated its funding needs, and (3) if the Corporation made changes to prevent another enrollment suspension and to address requirements established in the Strengthen AmeriCorps Program Act. GAO analyzed laws, reviewed documents, interviewed officials, assessed the reliability of the Trust database, examined the model used to estimate funding needs, and surveyed Americorps grantees."
Date:
January 16, 2004
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Correlation Profiles and Motifs in Complex Networks.
Networks have recently emerged as a unifying theme in complex systems research [1]. It is in fact no coincidence that networks and complexity are so heavily intertwined. Any future definition of a complex system should reflect the fact that such systems consist of many mutually interacting components. These components are far from being identical as say electrons in systems studied by condensed matter physics. In a truly complex system each of them has a unique identity allowing one to separate it from the others. The very first question one may ask about such a system is which other components a given component interacts with? This information system wide can be visualized as a graph, whose nodes correspond to individual components of the complex system in question and edges to their mutual interactions. Such a network can be thought of as a backbone of the complex system. Of course, system's dynamics depends not only on the topology of an underlying network but also on the exact form of interaction of components with each other, which can be very different in various complex systems. However, the underlying network may contain clues about the basic design principles and/or evolutionary history of the complex …
Date:
January 16, 2004
Creator:
Maslov, S.; Sneppen, K. & Alon, U.
Object Type:
Book
System:
The UNT Digital Library
["The Cottonclub" musical revue performance tape 2 of 2]
Video recording from The Black Academy of Arts and Letters recorded a performance of a musical revue given by the Cottonclub over the hits of the 1920s and 1930s during October of 2004. The footage shows the second half of the performance with hits such as "Honky Tonk Town", "Yo' Feet's Too Big", "You've Got the Right Key but the Wrong Keyhole", and "Fat and Greasy". The performers all wear costumes such as flapper dresses and suits.
Date:
October 16, 2004
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
Coupled Geochemical and Hydrological Processes Governing the Fate and Transport of Radionuclides and Toxic Metals Beneath the Hanford Tank Farms
This annual report describes 1.5 y of progress on a 3 y project. The project addresses the goals of the Environmental Management Sciences Program (EMSP) that seeks innovative basic research to benefit cleanup technologies and decision-making strategies for contaminated environments. Our project specifically addresses Hanford research needs in subsurface science by contributing to the objectives of the Tank Farm Vadose Characterization Project and the 200 Area Remedial Action Project which are components of the Hanford Site Groundwater/Vadose Zone Integration Project (Integration Project). The work described within is intended to advance the technological and scientific needs associated with the long-term management of the enormous in-ground inventories of 235/238U, 99Tc, 60Co, and Cr(VI) present at the Hanford site. We believe that scientifically defensible predictions of contaminant transport and strategies for remediation must be based upon a field-relevant understanding of coupled hydrological and geochemical processes that control subsurface contaminant fate and transport. This research project investigates the migration of 235/238U, 90Sr, 60Co, and Cr(VI) in undisturbed sediments from the Hanford site using realistic experimental protocols designed to delineate complex hydrological and geochemical processes controlling contaminant movement.
Date:
June 16, 2004
Creator:
Jardin, Philip M.; Fendorf, Scott E. & Mayes, Melanie
Object Type:
Report
System:
The UNT Digital Library
Criminal Charges in Corporate Scandals
Since the collapse of Enron Corp. in late 2001, there has been a series of scandals involving major U.S. corporations. Recurring elements in the scandals include improper or fraudulent accounting, self-enrichment by corporate officers, stock trading on inside information, and the destruction or falsification of business records. This report tracks post-Enron criminal charges.
Date:
July 16, 2004
Creator:
Jickling, Mark & Janov, Paul H.
Object Type:
Report
System:
The UNT Digital Library
Critical Infrastructure Protections: The 9/11 Commission Report
None
Date:
August 16, 2004
Creator:
Moteff, John D.
Object Type:
Report
System:
The UNT Digital Library
The Cuero Record (Cuero, Tex.), Vol. 110, No. 24, Ed. 1 Wednesday, June 16, 2004
Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
June 16, 2004
Creator:
Rea, Glenn
Object Type:
Newspaper
System:
The Portal to Texas History
Current and Future Carbon Budgets of Tropical Rain Forest: A Cross Scale Analysis. Final Report
The goal of this project was to make a first assessment of the major carbon stocks and fluxes and their climatic determinants in a lowland neotropical rain forest, the La Selva Biological Station, Costa Rica. Our research design was based on the concurrent use of several of the best available approaches, so that data could be cross-validated. A major focus of our effort was to combine meteorological studies of whole-forest carbon exchange (eddy flux), with parallel independent measurements of key components of the forest carbon budget. The eddy flux system operated from February 1998 to February 2001. To obtain field data that could be scaled up to the landscape level, we monitored carbon stocks, net primary productivity components including tree growth and mortality, litterfall, woody debris production, root biomass, and soil respiration in a series of replicated plots stratified across the major environmental gradients of the forest. A second major focus of this project was on the stocks and changes of carbon in the soil. We used isotope studies and intensive monitoring to investigate soil organic stocks and the climate-driven variation of soil respiration down the soil profile, in a set of six 4m deep soil shafts stratified across the …
Date:
January 16, 2004
Creator:
Oberbauer, S. F.
Object Type:
Report
System:
The UNT Digital Library
Dallas Voice (Dallas, Tex.), Vol. 20, No. 39, Ed. 1 Friday, January 16, 2004
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
January 16, 2004
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
Dallas Voice (Dallas, Tex.), Vol. 20, No. 49, Ed. 1 Friday, April 16, 2004
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
April 16, 2004
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
Dallas Voice (Dallas, Tex.), Vol. 21, No. 10, Ed. 1 Friday, July 16, 2004
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
July 16, 2004
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
Data Mining: An Overview
Data mining is emerging as one of the key features of many homeland security initiatives. Often used as a means for detecting fraud, assessing risk, and product retailing, data mining involves the use of data analysis tools to discover previously unknown, valid patterns and relationships in large data sets. This report discusses the data mining uses (i.e. Terrorism Information Awareness (TIA) Program) and issues (i.e. data quality, interoperability, privacy), as well as the limitations of data mining.
Date:
December 16, 2004
Creator:
Seifert, Jeffrey W.
Object Type:
Report
System:
The UNT Digital Library
Deep Vs Profiling Along the Top of Yucca Mountain Using a Vibroseis Source and Surface Waves
Yucca Mountain, Nevada, was approved as the site for development of the geologic repository for high-level radioactive waste and spent nuclear fuel in the United States. The U.S. Department of Energy has been conducting studies to characterize the site and assess its future performance as a geologic repository. As part of these studies, a program of deep seismic profiling, to depths of 200 m, was conducted along the top of Yucca Mountain to evaluate the shear-wave velocity (V{sub s}) structure of the repository block. The resulting V{sub s} data were used as input into the development of ground motions for the preclosure seismic design of the repository and for postclosure performance assessment. The noninvasive spectral-analysis-of-surface-waves (SASW) method was employed in the deep profiling. Field measurements involved the use of a modified Vibroseis as the seismic source. The modifications allowed the Vibroseis to be controlled by a signal analyzer so that slow frequency sweeps could be performed while simultaneous narrow-band filtering was performed on the receiver outputs. This process optimized input energy from the source and signal analysis of the receiver outputs. Six deep V{sub s} profiles and five intermediate-depth (about 100 m) profiles were performed along the top of Yucca …
Date:
March 16, 2004
Creator:
Stokoe, K.; Rosenblad, B.; Wong, I.; Bay, J.; Thomas, P. & Silva, W.
Object Type:
Article
System:
The UNT Digital Library
Defense Management: Opportunities to Enhance the Implementation of Performance-Based Logistics
A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) is pursuing a policy that promotes performance-based logistics at the platform level as the preferred product support strategy for its weapon systems, based in part on DOD's perception that this is an industry best practice. GAO was asked to compare industry practices for activities using complex and costly equipment with life-cycle management issues similar to those of military systems to identify lessons learned that can be useful to DOD. This is the first of two reports addressing DOD's implementation of performance-based logistics and is intended to facilitate DOD's development of new guidance on the use of this approach."
Date:
August 16, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Deposit Summary
Deposit summary of $755.00 made on June 16, 2004.
Date:
June 16, 2004
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Design and implementation of a vacuum compatible laser-basedsub-nm resolution absolute distance measurement gauge
We describe the design and implementation of a vacuum compatible laser-based absolute distance measurement gauge with sub-nm resolution. The present system is compatible with operation in the 10{sup -8} Torr range and with some minor modifications could be used in the 10{sup -9} Torr range. The system is based on glancing incidence reflection and dual segmented diode detection. The system has been implemented as a focus sensor for extreme ultraviolet interferometry and microlithography experiments at Lawrence Berkeley National Laboratory's Advanced Light Source synchrotron radiation facility and 1{sigma} operational measurement noise floor of 0.26 nm has been demonstrated.
Date:
February 16, 2004
Creator:
Naulleau, Patrick P.; Denham, Paul E. & Rekawa, Senajith
Object Type:
Article
System:
The UNT Digital Library