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A 3-Dimensional discrete fracture network generator to examine fracture-matrix interaction using TOUGH2
Water fluxes in unsaturated, fractured rock involve the physical processes occurring at fracture-matrix interfaces within fracture networks. Modeling these water fluxes using a discrete fracture network model is a complicated effort. Existing preprocessors for TOUGH2 are not suitable to generate grids for fracture networks with various orientations and inclinations. There are several 3-D discrete-fracture-network simulators for flow and transport, but most of them do not capture fracture-matrix interaction. We have developed a new 3-D discrete-fracture-network mesh generator, FRACMESH, to provide TOUGH2 with information about the fracture network configuration and fracture-matrix interactions. FRACMESH transforms a discrete fracture network into a 3 dimensional uniform mesh, in which fractures are considered as elements with unique rock material properties and connected to surrounding matrix elements. Using FRACMESH, individual fractures may have uniform or random aperture distributions to consider heterogeneity. Fracture element volumes and interfacial areas are calculated from fracture geometry within individual elements. By using FRACMESH and TOUGH2, fractures with various inclinations and orientations, and fracture-matrix interaction, can be incorporated. In this paper, results of flow and transport simulations in a fractured rock block utilizing FRACMESH are presented.
Date:
April 9, 2003
Creator:
Ito, Kazumasa & Yongkoo, Seol
Object Type:
Article
System:
The UNT Digital Library
2002-2003 Engineering Accomplishments: Unconventional Nuclear Weapons Detection
The Defense Threat Reduction Agency, DTRA, is a federal agency charged with safeguarding the nation from weapons of mass destruction, in particular nuclear weapons such as crude devices, and radiological dispersal devices (RDD), also known as dirty bombs. Both of which could be delivered using unconventional means such as by transporting them by a car or boat. Two years ago DTRA partnered with NNSA to evaluate commercially available technologies that could be deployed quickly to defend against threats posed by unconventional nuclear weapons under a program called the Unconventional Nuclear Warfare Defense (UNWD) Program. Lawrence Livermore National Laboratory (LLNL) was one of several National laboratories that participated in this program, which consisted in developing, deploying, and demonstrating detection systems suitable for military base protection. Two key contributions to this program by the LLNL team were the development of two Radiation Detection Buoys (RDB) deployed at Naval Base in Kings Bay in Georgia, and the Detection and Tracking System (DTS) demonstrated at Fort Leonard Wood Missouri, headquarters for the Total Force's Maneuver Support Center (MANSCEN). The RDB's were designed to detect the potential transportation of an unconventional nuclear or radiological weapon by a boat. The RDB's consisted of two commercial marine …
Date:
April 9, 2004
Creator:
Hernandez, Jose E. & Valentine, John
Object Type:
Report
System:
The UNT Digital Library
2007 Annual Health Physics Report for the HEU Transparency Program
During the 2007 calendar year, Lawrence Livermore National Laboratory (LLNL) provided health physics support for the Highly Enriched Uranium (HEU) Transparency Program for external and internal radiation protection and technical expertise related to BDMS radioactive sources and Russian radiation safety regulatory compliance. For the calendar year 2007, there were 172 person-trips that required dose monitoring of the U.S. monitors. Of the 172 person-trips, 160 person-trips were SMVs and 12 person-trips were Transparency Monitoring Office (TMO) trips. There were 12 monitoring visits by TMO monitors to facilities other than UEIE and 10 to UEIE itself. There were two monitoring visits (source changes) that were back to back with 14 monitors. LLNL's Hazard Control Division laboratories provided the dosimetry services for the HEU Transparency monitors.
Date:
April 9, 2008
Creator:
Radev, R
Object Type:
Report
System:
The UNT Digital Library
2010 MARINE MICROBES GORDON RESEARCH CONFERENCE (JULY 4-9, 2010 - TILTON SCHOOL, TILTON NH)
Marine microbes include representatives from all three kingdoms of life and collectively carry out virtually all forms of metabolisms found on the planet. Because of this metabolic and genetic diversity, these microbes mediate many of the reactions making up global biogeochemical cycles which govern the flow of energy and material in the biosphere. The goal of this conference is to bring together approaches and concepts from studies of microbial evolution, genomics, ecology, and oceanography in order to gain new insights into marine microbes and their biogeochemical functions. The integration of scales, from genes to global cycles, will result in a better understanding of marine microbes and of their contribution to the carbon cycle and other biogeochemical processes.
Date:
April 9, 2010
Creator:
Kirchman, David
Object Type:
Article
System:
The UNT Digital Library
2013 Annual Report: Actions Needed to Reduce Fragmentation, Overlap, and Duplication and Achieve Other Financial Benefits
A letter report issued by the Government Accountability Office with an abstract that begins ""
Date:
April 9, 2013
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Acceptance of Classified Excess Components for Disposal at Area 5
This slide-show discusses weapons dismantlement and disposal, issues related to classified waste and their solutions.
Date:
April 9, 2012
Creator:
Poling, Jeanne & Saad, Max
Object Type:
Article
System:
The UNT Digital Library
Adaptive Algebraic Multigrid Methods
Our ability to simulate physical processes numerically is constrained by our ability to solve the resulting linear systems, prompting substantial research into the development of multiscale iterative methods capable of solving these linear systems with an optimal amount of effort. Overcoming the limitations of geometric multigrid methods to simple geometries and differential equations, algebraic multigrid methods construct the multigrid hierarchy based only on the given matrix. While this allows for efficient black-box solution of the linear systems associated with discretizations of many elliptic differential equations, it also results in a lack of robustness due to assumptions made on the near-null spaces of these matrices. This paper introduces an extension to algebraic multigrid methods that removes the need to make such assumptions by utilizing an adaptive process. The principles which guide the adaptivity are highlighted, as well as their application to algebraic multigrid solution of certain symmetric positive-definite linear systems.
Date:
April 9, 2004
Creator:
Brezina, M; Falgout, R; MacLachlan, S; Manteuffel, T; McCormick, S & Ruge, J
Object Type:
Article
System:
The UNT Digital Library
Additional cooling and heating load improvements in seasonal performance modeling of room and central air conditioners and heat pumps. Topical report, Subtask 3. 2
The study focuses on improving the load modeling technique of Seasonal Performance Model (SPM) in order to estimate a more realistic load for seasonal analysis calculations on an hourly basis. A computer simulation program, Seasonal Performance Model Load (SPMLD), was used to calculate the cooling and heating loads for a typical residence in Caribou, Maine; Columbia, Missouri; and Fort Worth, Texas. The derivation of the SPMLD is described and changes made to improve cooling and heating load estimates are identified. (MCW)
Date:
April 9, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced multi-dimensional method for structural and hydrodynamic analyses of LMFBR piping systems
Maintaining the structural integrity of the piping system of Liquid Metal Fast Breeder Reactors (LMFBRs) is essential to the safe operation of the reactor and steam supply systems. In the safety analysis various transient loads can be imposed on the piping systems, which may pose threats to the integrity of the piping structure. These transient loads can be classified into two categories. The first represents dynamic loads resulting from the hydrodynamic pressure-wave propagation or seismic events. The second represents static or quasi-dynamic loads generated by thermal wave propagation, normal operation transient, or creep phenomena. At Argonne National Laboratory, a multi-dimensional method has been developed for the integrated analysis of piping systems under these transient loading conditions. It utilizes a 2-D implicit finite-difference hydrodynamics in conjunction with a 3-D explicit finite-element structural analysis.
Date:
April 9, 1985
Creator:
Wang, C. Y. & Zeuch, W. R.
Object Type:
Article
System:
The UNT Digital Library
Advanced turbine systems program: Conceptual design and product development. Quarterly report, November 1, 1995--January 31, 1996
Several tasks were completed. Design and test of critical components are discussed. Plans for the next reporting period are outlined.
Date:
April 9, 1996
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advertising Device
Patent for an advertising device meant to sit on a desk as a ruler. This device is designed to make the images on its surface appear to be suspended in air when it is lifted. It can be manufactured cheaply and is intended to be distributed for free as both a ruler and advertisement.
Date:
April 9, 1918
Creator:
Glisson, Amos Adolphus
Object Type:
Patent
System:
The Portal to Texas History
Afghanistan: Post-Taliban Governance, Security, and U.S. Policy
This report discusses the current political state of Afghanistan, focusing particularly on the influence of the Taliban and other militant groups, and on the leadership of Afghan President Hamid Karzai. This report also discusses the U.S.-Afghanistan relationship, in both the short and long term, and U.S. efforts under the Obama Administration to provide military, reconstructive, and stabilization aid.
Date:
April 9, 2014
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Agricultural Conservation: A Guide to Programs
This report provides a listing of federal agricultural conservation assistance programs. Each listing includes a brief description of the program, information on major amendments in the Agricultural Act of 2014 (P.L. 113-79, 2014 farm bill), national scope and availability, states with the greatest participation, the backlog of applications or other measures of continuing interest, program funding authority, FY2018 funding, FY2019 Administration budget request, statutory authority, the authorization expiration date, and a link to the program's website.
Date:
April 9, 2015
Creator:
Stubbs, Megan
Object Type:
Report
System:
The UNT Digital Library
Agriculture: Previewing the 2002 Farm Bill
This report discusses what a farm bill is and the process of renewing one every year. This report specifically covers the farm bill for 2002 and the issues that come with it. Moreover, the report highlights the importance of exports within the U.S. agricultural economy and how this is a key interest in the renewal of farm bills.
Date:
April 9, 2001
Creator:
Becker, Geoffrey S.; Chite, Ralph M.; Jones, Jean Y.; Rawson, Jean M.; Womach, Jasper; Zinn, Jeffrey A. et al.
Object Type:
Report
System:
The UNT Digital Library
AIDS in Africa
Sub-Saharan Africa has been far more severely affected by AIDS than any other part of the world. The United Nations reports that 25.3 million adults and children are infected with the HIV virus in the region, which has about 10% of the world's population but more than 70% of the worldwide total of infected people. This report discusses this issue in detail, including the cause of the African AIDS epidemic, the social and economic consequences, response and treatment, and U.S. policy.
Date:
April 9, 2002
Creator:
Copson, Raymond W.
Object Type:
Report
System:
The UNT Digital Library
Air-Propeller
Patent for a propeller for aircrafts. Illustrations included.
Date:
April 9, 1912
Creator:
Buchanan, Jesey H.
Object Type:
Patent
System:
The Portal to Texas History
Air Quality Standards: The Decisionmaking Process
This report discusses how the decisions made by the Administrator of the Environmental Protection Agency (EPA) in July 1997 impacted the process by which decisions are made by the agency. The new standards were subject to litigation, oversight hearings, and a Supreme Court ruling. Moreover, issues concerning implementation of the proposed air quality standards were raised.
Date:
April 9, 2002
Creator:
Blodgett, John E. & Parker, Larry B.
Object Type:
Report
System:
The UNT Digital Library
Altitude-Wind-Tunnel Investigation of the 19B-2, 19B-8, and 19XB-1 Jet Propulsion Engines, 4 - Performance and Windmilling Drag Characteristics
The performance characteristics of the 19B-8 and 19XB-1 turbojet engines and the windmilling-drag characteristics of the 19B-6 engine were determined in the Cleveland altitude wind tunnel. The investigations were conducted on the 19B-8 engine at simulated altitudes from 5000 to 25,000 feet with various free-stream ram-pressure ratios and on the 19XB--1 engine at simulated altitudes from 5000 to 30,000 feet with approximately static free-stream conditions.
Date:
April 9, 1947
Creator:
Fleming, William A. & Dietz, Robert O., Jr.
Object Type:
Report
System:
The UNT Digital Library
“Amazon Laws” and Taxation of Internet Sales: Constitutional Analysis
The report is a Constitutional Analysis of “Amazon Laws” and Taxation of Internet Sales: Constitutional Analysis.
Date:
April 9, 2015
Creator:
Lunder, Erika K. & Pettit, Carol A.
Object Type:
Report
System:
The UNT Digital Library
Amnesty: A Selective and Annotated Bibliography
This report provides an annotated bibliography of resources related to the debate regarding amnesty for Vietnam War draft evaders and deserters.
Date:
April 9, 1973
Creator:
Goldich, Robert L.
Object Type:
Report
System:
The UNT Digital Library
Analysis of data from IP-56-A-86MT: Evaluation of dimensional stability characteristics of low hydrogen uranium I and E fuel elements
This production test was designed to evaluate the suitability of low hydrogen dingot uranium as routine process material. Nine tubes of I and E fuel elements (6 dingot, 3 ingot) with 32 fuel elements in each tube, have recently been discharged at the C Reactor and this document contains the results of analyses made on the dimensional stability properties of this material.
Date:
April 9, 1959
Creator:
Stewart, K. B.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Heat Transfer and Fluid Friction for Fully Developed Turbulent Flow of Supercritical Water With Variable Fluid Properties in a Smooth Tube
From Summary: "Calculated velocity and temperature distributions, as well as relations among Nusselt number, Reynolds number, and friction factor, are presented. The effect of variation of fluid properties across the tube on the Nusselt number and friction factor correlations can be eliminated by evaluating the properties at a reference temperature which is a function of both the wall temperature and the ratio of wall-to-bulk temperatures."
Date:
April 9, 1953
Creator:
Deissler, Robert G. & Taylor, Maynard F.
Object Type:
Report
System:
The UNT Digital Library
An Analysis of STEM Education Funding at the NSF: Trends and Policy Discussion
This report analyzes National Science Foundation funding trends and selected closely related STEM (science, technology, engineering, and math) education policy issues in order to place conversations about FY2013 funding in broader fiscal and policy context. It concludes with an analysis of potential policy options.
Date:
April 9, 2012
Creator:
Gonzalez, Heather B.
Object Type:
Report
System:
The UNT Digital Library
Analytical Solutions for the Nonlinear Longitudinal Drift Compression (Expansion) of Intense Charged Particle Beams
To achieve high focal spot intensities in heavy ion fusion, the ion beam must be compressed longitudinally by factors of ten to one hundred before it is focused onto the target. The longitudinal compression is achieved by imposing an initial velocity profile tilt on the drifting beam. In this paper, the problem of longitudinal drift compression of intense charged particle beams is solved analytically for the two important cases corresponding to a cold beam, and a pressure-dominated beam, using a one-dimensional warm-fluid model describing the longitudinal beam dynamics.
Date:
April 9, 2004
Creator:
Startsev, Edward A. & Davidson, Ronald C.
Object Type:
Report
System:
The UNT Digital Library