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Optimized Volumetric Scanning for X-Ray Array Sources (open access)

Optimized Volumetric Scanning for X-Ray Array Sources

Non-destructive evaluation (NDE) is the science and technology of determining non-invasively the internal structure of manufactured parts, objects, and materials. NDE application areas include medicine, industrial manufacturing, military, homeland security, and airport luggage screening. X-ray measurement systems are most widely used because of their ability to image through a wide range of material densities (from human tissue in medical applications to the dense materials of weapon components). Traditional x-ray systems involve a single source and detector system that rotate and/or translate about the object under evaluation. At each angular location, the source projects x-rays through the object. The rays undergo attenuation proportional to the density of the object's constitutive material. The detector records a measure of the attenuation. Mathematical algorithms are used to invert the forward attenuated ray projection process to form images of the object. This is known as computed tomography (CT). In recent years, the single-source x-ray NDE systems have been generalized to arrays of x-ray sources. Array sources permit multiple views of the object with fewer rotations and translations of the source/detector system. The spatially diverse nature of x-ray array sources has the potential of reducing data collection time, reducing imaging artifacts, and increasing the resolution of …
Date: September 29, 2009
Creator: Lehman, S. K.; Foudray, A. M.; Wang, A.; Kallman, J. S. & Martz, H.
System: The UNT Digital Library

Oral History Interview with Carol West, May 29, 2008

Access: Use of this item is restricted to the UNT Community
Transcript of an interview with Reverend Carol West, pastor of Celebration Community Church in Fort Worth. Reverend West discusses concerning her childhood in Greenville and Irving, Tex.; early years in a Unitarian Church congregation; education at North Texas State College and Texas Christian University; career as a public school English teacher; experience of "coming out" to self, friends, and family; experience as a member of MCC Fort Worth; decision to enter ministry; training in suicide prevention, trauma debriefing, and hostage negotiation; ordination at MCC Dallas; political activism during AIDS crisis, particularly at Parkland Hospital; work as an associate pastor and AIDS chaplain at MCC Dallas; work with AIDS Outreach Center of Fort Worth and AIDS Interfaith Network of Dallas; receiving "call" to pastor Celebration Community Church; demographics of congregation.
Date: May 29, 2008
Creator: Mims, Michael & West, Carol, 1949-
System: The UNT Digital Library

Oral History Interview with Cassandra F. Berry, November 29, 2006

Access: Use of this item is restricted to the UNT Community
Interview with Denton resident Cassandra F. Berry, UNT employee with a personal interest in the history of Quakertown, as part of the Quakertown Oral History Project. The interview includes Berry's personal experiences about working at UNT as the Associate Vice President for Equity and Diversity, as well as her service to the Denton African American Museum, which led to her interest in the history of Quakertown.
Date: November 29, 2006
Creator: Yancey, Sherelyn & Berry, Cassandra F.
System: The UNT Digital Library
Chapter 9: Model Systems for Formation and Dissolution of Calcium Phosphate Minerals (open access)

Chapter 9: Model Systems for Formation and Dissolution of Calcium Phosphate Minerals

Calcium phosphates are the mineral component of bones and teeth. As such there is great interest in understanding the physical mechanisms that underlie their growth, dissolution, and phase stability. Control is often achieved at the cellular level by the manipulation of solution states and the use of crystal growth modulators such as peptides or other organic molecules. This chapter begins with a discussion of solution speciation in body fluids and relates this to important crystal growth parameters such as the supersaturation, pH, ionic strength and the ratio of calcium to phosphate activities. We then discuss the use of scanning probe microscopy as a tool to measure surface kinetics of mineral surfaces evolving in simplified solutions. The two primary themes that we will touch on are the use of microenvironments that temporally evolve the solution state to control growth and dissolution; and the use of various growth modifiers that interact with the solution species or with mineral surfaces to shift growth away from the lowest energy facetted forms. The study of synthetic minerals in simplified solution lays the foundation for understand mineralization process in more complex environments found in the body.
Date: July 29, 2006
Creator: Orme, C. A. & Giocondi, J. L.
System: The UNT Digital Library

Oral History Interview with Alma Clark, September 29, 2006

Access: Use of this item is restricted to the UNT Community
Interview with Alma Clark, first-generation descendant through marriage of Quakertown residents, as part of the Quakertown Oral History Project. The interview includes Clark's personal experiences about childhood and education, marrying Rev. "Willie" Clark, moving to Denton, and participating in Denton Christian Women's Fellowship. Clark also discusses her family's experience in Denton as well as her husband's feelings regarding Denton's Civic Center Park, on the site of Quakertown. The interview includes an appendix with photographs.
Date: June 29, 2006
Creator: Yancey, Sherelyn & Clark, Alma
System: The UNT Digital Library
Base Visit Book - AF30 (open access)

Base Visit Book - AF30

Contains Base Visit Book for Sheppard Air Force Base, TX
Date: November 29, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
Base Visit Book - DFAS (open access)

Base Visit Book - DFAS

Contains the Base Visit Book for Defense Finance & Accounting Service Columbus, OH/ Denver, CO
Date: November 29, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
Base Visit Book - NAS Brunswick, ME (2nd Visit) (open access)

Base Visit Book - NAS Brunswick, ME (2nd Visit)

Contains Base Visit Report by Navy Team Analyst Hal Tickle for the second trip to NAS Brunswick, ME
Date: November 29, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
BRAC Commission Briefing Book (open access)

BRAC Commission Briefing Book

Contains BRAC Commission briefing materials from May 2-4, 2005
Date: November 29, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
Media Briefing Book - NMC19 (open access)

Media Briefing Book - NMC19

Contains the Media Briefing Book for NAS Pensacola, FL
Date: November 29, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
Reports - Overseas Basing Commission (open access)

Reports - Overseas Basing Commission

Contains the Final Report from the Overseas Basing Commission
Date: November 29, 2005
Creator: unknown
System: The UNT Digital Library
Development of U.S. Regulations for the Transportation of Radioactive Materials - A Look Back Over the Past 40 Years (open access)

Development of U.S. Regulations for the Transportation of Radioactive Materials - A Look Back Over the Past 40 Years

The discussion in this Chapter is a relatively straightforward, chronological description of the development of U.S. transportation regulations for radioactive materials over the past 40 years. Although primarily based on the development of U.S. regulations for the shipment of what is now known as Type B quantities of radioactive materials, the information presented details the interactions between a number of U.S. governmental agencies, commissions, and departments, and the International Atomic Energy Agency (IAEA). For the most part, the information that follows was taken directly from the Federal Register, between 1965 and 2004, which, within the boundaries of the U.S., is considered law, or at least policy at the federal level. Starting in 1978, however, the information presented also takes a look at a series of so-called Guidance Documents, including Regulatory Guides (Reg. Guides), NUREGs, and NUREG/CRs. Developed originally by the U.S. Atomic Energy Agency (AEC), and later adapted by the U.S. Nuclear Regulatory Commission (NRC), the NUREGs and NUREG/CRs cited in this Chapter clearly specify a preferred methodology that can be used to meet the regulatory requirements of Title 10 of the Code of Federal Regulations, Part 71 (10 CFR Part 71, or, more simply, 10 CFR 71). As is …
Date: August 29, 2005
Creator: Hafner, R. S.
System: The UNT Digital Library
Biodiesel--Clean, Green Diesel Fuel: Great Fleet Fuel Gaining Popularity Rapidly (open access)

Biodiesel--Clean, Green Diesel Fuel: Great Fleet Fuel Gaining Popularity Rapidly

A fact sheet that answers common questions about Biodiesel, including use, safety, and environmental questions.
Date: July 29, 2005
Creator: Tyson, K.S.
System: The UNT Digital Library
Fort Monmouth Base Visit Report (open access)

Fort Monmouth Base Visit Report

Base Visit Report - 103-06A - A8 - Base Visit Report (2nd Addendum) ARMY - Fort Monmouth, New Jersey. BRAC Commission FY, Lead Commissioner: Philip Coyle, Commission staff: Wesley E. Hood (Army Senior Analyst)
Date: July 29, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
System: The UNT Digital Library
Niagara Falls ARB Economic Impact Report S318 (open access)

Niagara Falls ARB Economic Impact Report S318

Disregard header and footer restrictions - Economic Impact Report for Niagara Falls ARB and surrounding communities.
Date: July 29, 2005
Creator: United States. Department of Defense.
System: The UNT Digital Library
Application of NMR Methods to Identify Detection Reagents for Use in the Development of Robust Nanosensors (open access)

Application of NMR Methods to Identify Detection Reagents for Use in the Development of Robust Nanosensors

Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful technique for studying bi-molecular interactions at the atomic scale. Our NMR lab is involved in the identification of small molecules, or ligands that bind to target protein receptors, such as tetanus (TeNT) and botulinum (BoNT) neurotoxins, anthrax proteins and HLA-DR10 receptors on non-Hodgkin's lymphoma cancer cells. Once low affinity binders are identified, they can be linked together to produce multidentate synthetic high affinity ligands (SHALs) that have very high specificity for their target protein receptors. An important nanotechnology application for SHALs is their use in the development of robust chemical sensors or biochips for the detection of pathogen proteins in environmental samples or body fluids. Here, we describe a recently developed NMR competition assay based on transferred nuclear Overhauser effect spectroscopy (trNOESY) that enables the identification of sets of ligands that bind to the same site, or a different site, on the surface of TeNT fragment C (TetC) than a known ''marker'' ligand, doxorubicin. Using this assay, we can identify the optimal pairs of ligands to be linked together for creating detection reagents, as well as estimate the relative binding constants for ligands competing for the same site.
Date: April 29, 2004
Creator: Cosman, M; Krishnan, V V & Balhorn, R
System: The UNT Digital Library
Committee and Subcommittee Assignments for the 107th Congress (open access)

Committee and Subcommittee Assignments for the 107th Congress

The Senate of the United States Committee and Subcommittee Assignments for the 107th congress.
Date: November 29, 2001
Creator: United States. Congress. Office of Technology Assessment.
System: The UNT Digital Library
Assessing Climate to Improve Solar Design. Energy Efficiency and Renewable Energy Clearinghouse (EREC) Brochure (open access)

Assessing Climate to Improve Solar Design. Energy Efficiency and Renewable Energy Clearinghouse (EREC) Brochure

This fact sheet complements the fact sheet on passive solar design, and provides information on how sunlight, weather patterns, and microclimates affect the performance of solar energy systems and designs.
Date: August 29, 2001
Creator: Phillips, J.
System: The UNT Digital Library

Oral History Interview with Harry E. Chase, January 29, 2001

Access: Use of this item is restricted to the UNT Community
Interview with pastor and Navy veteran Harry E. Chase. The interview includes Chase's personal experiences while aboard the destroyer tender USS Dobbin during the Japanese attack at Pearl Harbor on December 7, 1941.
Date: January 29, 2001
Creator: Marcello, Ronald E. & Chase, Harry E.
System: The UNT Digital Library
PET IMAGING STUDIES IN DRUG ABUSE RESEARCH. (open access)

PET IMAGING STUDIES IN DRUG ABUSE RESEARCH.

There is overwhelming evidence that addiction is a disease of the brain (Leshner, 1997). Yet public perception that addiction is a reflection of moral weakness or a lack of willpower persists. The insidious consequence of this perception is that we lose sight of the fact that there are enormous medical consequences of addiction including the fact that a large fraction of the total deaths from cancer and heart disease are caused by smoking addiction. Ironically the medical school that educates physicians in addiction medicine and the cancer hospital that has a smoking cessation clinic are vanishingly rare and efforts at harm reduction are frequently met with a public indignation. Meanwhile the number of people addicted to substances is enormous and increasing particularly the addictions to cigarettes and alcohol. It is particularly tragic that addiction usually begins in adolescence and becomes a chronic relapsing problem and there are basically no completely effective treatments. Clearly we need to understand how drugs of abuse affect the brain and we need to be creative in using this information to develop effective treatments. Imaging technologies have played a major role in the conceptualization of addiction as a disease of the brain (Fowler et al., 1998a; …
Date: January 29, 2001
Creator: Fowler, J. S.; Volkow, N. D.; Ding, Y. S.; Logan, J. & Wang, G. J.
System: The UNT Digital Library
PEROXYNITRITE CHEMISTRY (open access)

PEROXYNITRITE CHEMISTRY

This century old area of research has been experiencing a renaissance during the last decade, with the annual number of publications on the subject increasing from only one in 1990 to nearly 200 in the late-1990s. This renewed interest is stimulated by the discovery of biological roles of nitric oxide, distinguished by the 1998 Nobel prize, and the recognition that the conversion of nitric oxide into peroxynitrite may play major roles in human diseases associated with oxidative stress and in cellular defense against invading pathogens. Peroxynitrite (ONOO{sup {minus}})is a structural isomer of nitrate (NO{sub 3}{sup {minus}}) that contains a peroxo bond. The physiological route to ONOO{sup {minus}} is provided by the combination of nitric oxide ({center_dot}NO) with superoxide ({center_dot}O{sub 2}{sup {minus}}), an extremely rapid reaction occurring upon every encounter of these radicals (the upper dot denotes radical species). Both {center_dot}NO and {center_dot}O{sub 2}{sup {minus}} are the oxygen metabolic products simultaneously generated in a number of cell types within a human body. Compared to its precursors, peroxynitrite is a much stronger oxidant capable of oxidizing proteins, nucleic acids, and lipids.
Date: November 29, 2000
Creator: Lymar, S. V.
System: The UNT Digital Library

Oral History Interview with Arthur B. Clark, September 29, 2000

Access: Use of this item is restricted to the UNT Community
Interview with Arhtur B. Clark, a Texas National Guard WWII veteran and POW from Abilene, Texas, who was captured with the 2nd Battalion, 131st Field Artillery. Clark discusses joining the National Guard, training and maneuvers, deployment to the Pacific, the fall of Java and surrender to the Japanese, experiences in internment at Tanjong Priok in Batavia, internment at Changi Camp in Singapore, labor on the Burma "Death" Railway, and liberation. The interview includes an appendix with a reference page and a written flight log by Col. Tom Sledge.
Date: September 29, 2000
Creator: Marcello, Ronald E. & Clark, Arthur B.
System: The UNT Digital Library
PV Working with Industry, 2nd Quarter, 2000 (open access)

PV Working with Industry, 2nd Quarter, 2000

NREL PV Working With Industry is a quarterly newsletter devoted to the research, development, and deployment performed by NREL staff in concert with their industry and university partners. The Second Quarter, 2000, issue is titled ``Our Shared PV Future''. It contains a review of several important PV-related meetings held in the prior three months: the NCPV Program Review, the 16 European PV Conference, and year-2000 Earth Day activities in Denver, CO. The editorialist is Paul Maycock, Publisher of PV News.
Date: June 29, 2000
Creator: Poole, L. & Moon, S.
System: The UNT Digital Library

Oral History Interview with Mansfield Millington Bascom, January 29, 2000

Access: Use of this item is restricted to the UNT Community
Interview with engineer and Army veteran Mansfield Millington Bascom. The interview includes Bascom's personal experiences about the European Theater during World War II, basic training, action on the Siegfried Line, the Battle of Aachen, individual episodes of close ground combat, German tank concentrations immediately prior to the Ardennes Offensive, being wounded and evacuating from the front, recuperation, and returning to the states.
Date: January 29, 2000
Creator: Alexander, William J. & Bascom, Mansfield Millington
System: The UNT Digital Library