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654 Matching Results
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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
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
[Adelfa Callejo and Hector Flores speak in front of a video camera]
A photo of two immigration protesters, Adelfa Callejo and Hector Flores. They appear to be in the midst of an interview - a video camera and microphone are pointed in their direction. A large crowd of protesters gather behind them. Many in the crowd carry flags or banners.
Date:
April 9, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Adelfa Callejo at the Dallas Mega March]
A photo of Adelfa Callejo, a Dallas lawyer and civil rights activist who is a leader in the Hispanic community. She is seen here marching in the April 2006 "Mega March" in Dallas, Texas protesting immigration laws along with Hector Flores and other protestors.
Date:
April 9, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
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 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
The Albany News (Albany, Tex.), Vol. 133, No. 46, Ed. 1 Thursday, April 9, 2009
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
April 9, 2009
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 101, No. 22, Ed. 1 Sunday, April 9, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 9, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 102, No. 22, Ed. 1 Monday, April 9, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 9, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 104, No. 21, Ed. 1 Tuesday, April 9, 2002
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 9, 2002
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 8, Ed. 1 Friday, April 9, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 9, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 313, Ed. 1 Sunday, April 9, 2006
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 9, 2006
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 108, No. 321, Ed. 1 Monday, April 9, 2007
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 9, 2007
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 109, No. 267, Ed. 1 Wednesday, April 9, 2008
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 9, 2008
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 111, No. 196, Ed. 1 Thursday, April 9, 2009
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 9, 2009
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, April 9, 2003
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
April 9, 2003
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
Alvin Sun-Advertiser (Alvin, Tex.), Vol. 109, No. 29, Ed. 1 Sunday, April 9, 2000
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
April 9, 2000
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Sun (Alvin, Tex.), Vol. 110, No. 29, Ed. 1 Monday, April 9, 2001
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
April 9, 2001
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
[American flag on sombrero]
Fotografía de una bandera estadounidense sujeta a un sombrero rojo, marrón claro y verde que lleva un manifestante de la inmigración.
Date:
April 9, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[American flags]
Una fotografía de manifestantes de la inmigración agitando banderas estadounidenses en la Mega Marcha de abril en Dallas. Se ven varias manos y la cara de un niño, parcialmente ocultas por las banderas.
Date:
April 9, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
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