Partner
UNT Libraries Government Documents Department
282
UNT Libraries Special Collections
143
Abilene Christian University Library
53
Oklahoma Historical Society
40
UNT Libraries
29
National Museum of the Pacific War/Admiral Nimitz Foundation
18
San Antonio Public Library
13
Sterling Municipal Library
12
UNT Music Library
7
Carl Albert Congressional Research and Studies Center
5
41 More
Collection
Office of Scientific & Technical Information Technical Reports
133
Texas Digital Newspaper Program
100
Congressional Research Service Reports
90
The Black Academy of Arts and Letters Records
60
Abilene Library Consortium
54
ACU Summit Lecture Series
52
University Photography Collection
52
Oklahoma Digital Newspaper Program
47
Photographing UNT
47
Tocker Foundation Grant
37
76 More
Degree Department
Degree Discipline
Degree Level
Year
Month
Day
Results:
1 - 24 of
671
next
Operation of a Free-Electron Laser from the Extreme Ultraviolet to the Water Window
We report results on the performance of a free-electron laser operating at a wavelength of 13.7 nm where unprecedented peak and average powers for a coherent extreme-ultraviolet radiation source have been measured. In the saturation regime, the peak energy approached 170 {micro}J for individual pulses, and the average energy per pulse reached 70 {micro}J. The pulse duration was in the region of 10 fs, and peak powers of 10 GW were achieved. At a pulse repetition frequency of 700 pulses per second, the average extreme-ultraviolet power reached 20mW. The output beam also contained a significant contribution from odd harmonics of approximately 0.6% and 0.03% for the 3rd (4.6 nm) and the 5th (2.75 nm) harmonics, respectively. At 2.75 nm the 5th harmonic of the radiation reaches deep into the water window, a wavelength range that is crucially important for the investigation of biological samples.
Date:
December 17, 2007
Creator:
Ackermann, W.; Asova, G.; Ayvazyan, V.; Azima, A.; Baboi, N.; Bahr, J. et al.
Object Type:
Article
System:
The UNT Digital Library
High Sensitivity Low Fluorescence Detection for Beryllium Particulates SBIR Phase I Final Report ER84587
Abstract: The technical objective in Phase I was to enhance the detection limit of beryllium using fluorescence system by a minimum factor of 10. This was to be achieved by modifying the chemistry and instrumentation. Both of these were completed independently. In each case we were able to lower the detection limit as desired. The objectives in Phase II are to adapt these changes for commercial activity (chemicals and instrument changes including automation).
Date:
April 17, 2007
Creator:
Agrawal, Anoop; Tonazzi, Juan Carlos Lopez & Cronin, John
Object Type:
Report
System:
The UNT Digital Library
Global Security, Medical Isotopes, and Nuclear Science
Over the past century basic nuclear science research has led to the use of radioactive isotopes into a wide variety of applications that touch our lives everyday. Some are obvious, such as isotopes for medical diagnostics and treatment. Others are less so, such as National/Global security issues. And some we take for granted, like the small amount of 241Am that is in every smoke detector. At the beginning of this century, we are in a position where the prevalence and importance of some applications of nuclear science are pushing the basic nuclear science community for improved models and nuclear data. Yet, at the same time, the push by the basic nuclear science community to study nuclei that are farther and farther away from stability also offer new opportunities for many applications. This talk will look at several global security applications of nuclear science, summarizing current R&D and need for improved nuclear data It will also look at how applications of nuclear science, such as to medicine, will benefit from the push for more and more powerful radioactive ion beam facilities.
Date:
September 17, 2007
Creator:
Ahle, L. E.
Object Type:
Article
System:
The UNT Digital Library
An Introduction to MODS: The Metadata Object Description Schema
This Tech Talks presentation offers an introduction to MODS. The presenter utilizes real life examples to show how MODS can be used with the Metadata Encoding and Transmission Standard (METS).
Date:
October 17, 2007
Creator:
Alemneh, Daniel Gelaw
Object Type:
Presentation
System:
The UNT Digital Library
Federal Liability for Hurricane Katrina-Related Flood Damage
None
Date:
August 17, 2007
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 24, No. 20, Ed. 1 Thursday, May 17, 2007
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
May 17, 2007
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
When Morality is not Enough - The Problem of Having a Social Ethic
Lecture given Monday, September 17, 2007, 3:00 PM at Abilene Christian University: "Historically, we have understood the gospel to be about personal salvation rather than about a new community founded on justice and mercy. Come and explore what it means to be the new community."
Date:
September 17, 2007
Creator:
Alvarez, Abel
Object Type:
Sound
System:
The Portal to Texas History
Memory of God and Justice for His World - Old Injustice in Our New World
Lecture given Monday, September 17, 2007, 4:00 PM at Abilene Christian University: "The message Micah brings is not what god wants from us, but rather who He wants us to be: everyday Christians who demand social justice for a hurting world."
Date:
September 17, 2007
Creator:
Alvarez, Elizabeth
Object Type:
Sound
System:
The Portal to Texas History
Application of a XMM-Newton EPIC Monte Carlo to Analysis And Interpretation of Data for Abell 1689, RXJ0658-55 And the Centaurus Clusters of Galaxies
We propose a new Monte Carlo method to study extended X-ray sources with the European Photon Imaging Camera (EPIC) aboard XMM Newton. The Smoothed Particle Inference (SPI) technique, described in a companion paper, is applied here to the EPIC data for the clusters of galaxies Abell 1689, Centaurus and RXJ 0658-55 (the ''bullet cluster''). We aim to show the advantages of this method of simultaneous spectral-spatial modeling over traditional X-ray spectral analysis. In Abell 1689 we confirm our earlier findings about structure in temperature distribution and produce a high resolution temperature map. We also confirm our findings about velocity structure within the gas. In the bullet cluster, RXJ 0658-55, we produce the highest resolution temperature map ever to be published of this cluster allowing us to trace what looks like the motion of the bullet in the cluster. We even detect a south to north temperature gradient within the bullet itself. In the Centaurus cluster we detect, by dividing up the luminosity of the cluster in bands of gas temperatures, a striking feature to the north-east of the cluster core. We hypothesize that this feature is caused by a subcluster left over from a substantial merger that slightly displaced the …
Date:
April 17, 2007
Creator:
Andersson, Karl E.; /SLAC, /Stockholm U.; Peterson, J.R.; /Purdue U. /KIPAC, Menlo Park; Madejski, G.M. & /SLAC /KIPAC, Menlo Park
Object Type:
Article
System:
The UNT Digital Library
A stable finite difference method for the elastic wave equation on complex geometries with free surfaces
The isotropic elastic wave equation governs the propagation of seismic waves caused by earthquakes and other seismic events. It also governs the propagation of waves in solid material structures and devices, such as gas pipes, wave guides, railroad rails and disc brakes. In the vast majority of wave propagation problems arising in seismology and solid mechanics there are free surfaces. These free surfaces have, in general, complicated shapes and are rarely flat. Another feature, characterizing problems arising in these areas, is the strong heterogeneity of the media, in which the problems are posed. For example, on the characteristic length scales of seismological problems, the geological structures of the earth can be considered piecewise constant, leading to models where the values of the elastic properties are also piecewise constant. Large spatial contrasts are also found in solid mechanics devices composed of different materials welded together. The presence of curved free surfaces, together with the typical strong material heterogeneity, makes the design of stable, efficient and accurate numerical methods for the elastic wave equation challenging. Today, many different classes of numerical methods are used for the simulation of elastic waves. Early on, most of the methods were based on finite difference approximations …
Date:
December 17, 2007
Creator:
Appelo, D & Petersson, N A
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Laverne Arnic, October 17, 2007
The National Museum of the Pacific War presents an interview with Laverne Arnic. Arnic joined the Army Air Forces in October of 1942. He was assigned to an Air Force Base in Spokane, Washington for two-and-a-half years and served as a guard. Around mid-1944 Arnic was sent overseas to the Pacific. He did not participate in any combat and was assigned as a guard of Japanese prisoners-of-war on the Island of Okinawa until the end of the war. He was discharged around 1945.
Date:
October 17, 2007
Creator:
Arnic, Laverne
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Laverne Arnic, October 17, 2007
The National Museum of the Pacific War presents an interview with Laverne Arnic. Arnic joined the Army Air Forces in October of 1942. He was assigned to an Air Force Base in Spokane, Washington for two-and-a-half years and served as a guard. Around mid-1944 Arnic was sent overseas to the Pacific. He did not participate in any combat and was assigned as a guard of Japanese prisoners-of-war on the Island of Okinawa until the end of the war. He was discharged around 1945.
Date:
October 17, 2007
Creator:
Arnic, Laverne
Object Type:
Text
System:
The Portal to Texas History
Her Wound Is Incurable (Micah 1:1-9)
Lecture given Monday, September 17, 2007, 11:00 AM at Abilene Christian University
Date:
September 17, 2007
Creator:
Asare, Fred
Object Type:
Sound
System:
The Portal to Texas History
Properties of Ellipticity Correlation with Atmospheric Structure From Gemini South
Cosmic shear holds great promise for a precision independent measurement of {Omega}{sub m}, the mass density of the universe relative to the critical density. The signal is expected to be weak, so a thorough understanding of systematic effects is crucial. An important systematic effect is the atmosphere: shear power introduced by the atmosphere is larger than the expected signal. Algorithms exist to extract the cosmic shear from the atmospheric component, though a measure of their success applied to a range of seeing conditions is lacking. To gain insight into atmospheric shear, Gemini South imaging in conjunction with ground condition and satellite wind data were obtained. We find that under good seeing conditions Point-Spread-Function (PSF) correlations persist well beyond the separation typical of high-latitude stars. Under these conditions, ellipticity residuals based on a simple PSF interpolation can be reduced to within a factor of a few of the shot-noise induced ellipticity floor. We also find that the ellipticity residuals are highly correlated with wind direction. Finally, we correct stellar shapes using a more sophisticated procedure and generate shear statistics from stars. Under all seeing conditions in our data set the residual correlations lie everywhere below the target signal level. For good …
Date:
January 17, 2007
Creator:
Asztalos, Stephen J.; de Vries, W. H.; Rosenberg, L. J.; Treadway, T.; Burke, D.; Claver, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Final Report - Novel Approach to Non-Precious Metal Catalysts
This project was directed at reducing the dependence of PEM fuel cells catalysts on precious metals. The primary motivation was to reduce the cost of the fuel cell stack as well as the overall system cost without loss of performance or durability. Platinum is currently the catalyst of choice for both the anode & the cathode. However, the oxygen reduction reaction (ORR) which takes place on the cathode is an inherently slower reaction compared to the hydrogen oxidation reaction (HOR) which takes place on the anode. Therefore, more platinum is needed on the cathode than on the anode to achieve suitable fuel cell performance. As a result, developing a replacement for platinum on the cathode side will have a larger impact on overall stack cost. Thus, the specific objectives of the project, as stated in the solicitation, were to produce non-precious metal (NPM) cathode catalysts which reduce dependence on precious metals (especially Pt), perform as well as conventional precious metal catalysts currently in use in MEAs, cost 50% less compared to a target of 0.2 g Pt/peak kW, & demonstrate durability of greater than 2000 hours with less than 10% power degradation. During the term of the project, DOE refined …
Date:
November 17, 2007
Creator:
Atanasoski, Radoslav
Object Type:
Report
System:
The UNT Digital Library
Final Technical Report for University of Michigan Industrial Assessment Center
The UM Industrial Assessment Center assisted 119 primary metals, automotive parts, metal casting, chemicals, forest products, agricultural, and glass manufacturers in Michigan, Ohio and Indiana to become more productive and profitable by identifying and recommending specific measures to improve energy efficiency, reduce waste and increase productivity. This directly benefits the environment by saving a total of 309,194 MMBtu of energy resulting in reduction of 0.004 metric tons of carbon emissions. The $4,618,740 implemented cost savings generated also saves jobs that are evaporating from the manufacturing industries in the US. Most importantly, the UM Industrial Assessment Center provided extremely valuable energy education to forty one UM graduate and undergraduate students. The practical experience complements their classroom education. This also has a large multiplier effect because the students take the knowledge and training with them.
Date:
April 17, 2007
Creator:
Atreya, Arvind
Object Type:
Report
System:
The UNT Digital Library
["Heart of Jazz" 2007 concert video, part 1]
Video footage from The Black Academy of Arts and Letters recorded during their "Heart of Jazz" concert held on Valentines' day weekend of 2007. The footage beings mid-performance. The footage covers sets I to III of Lonnie Liston Smith, and Bobbie Humphrey, Jon Lucien respectively.
Date:
February 17, 2007
Creator:
Ayers, Roy; Smith, Lonnie Liston; Humphrey, Bobbi & Lucien, Jon
Object Type:
Video
System:
The UNT Digital Library
["Heart of Jazz" 2007 concert video, part 2]
Video footage from The Black Academy of Arts and Letters recorded during their "Heart of Jazz" concert held on Valentines' day weekend of 2007. The footage beings mid-performance with Ray Gaskins speaking before he plays set IV on the keyboard. The footage covers sets IV to VII of Jean Carne, Roy Avers, and Wayne Henderson respectively.
Date:
February 17, 2007
Creator:
Ayers, Roy; Smith, Lonnie Liston; Humphrey, Bobbi; Lucien, Jon; Gaskins, Ray; Carne, Jean et al.
Object Type:
Video
System:
The UNT Digital Library
["Heart of Jazz" 2007 concert video, part 3]
Video footage from The Black Academy of Arts and Letters recorded during their "Heart of Jazz" concert held on Valentines' day weekend of 2007. The footage beings mid-performance and shows the finale of the concert with all musicians playing together on stage. The concert ends around the 11:00 minute mark with the audience standing and applauding. Curtis King gives a send-off speech.
Date:
February 17, 2007
Creator:
Ayers, Roy; Smith, Lonnie Liston; Humphrey, Bobbi; Lucien, Jon; Gaskins, Ray; Carne, Jean et al.
Object Type:
Video
System:
The UNT Digital Library
Measurement of CKM-angle gamma with Charmed B0 Meson Decays
This thesis reports measurements of the time-dependent CP asymmetries in fully reconstructed B{sup 0} {yields} (D{sup (*){-+}} and B{sup 0} {yields} D{sup {-+}} {rho}{sup {+-}}) decays in approximately 232 million {Upsilon}(4S) {yields} B{bar B} events, collected with the BABAR detector at the PEP-II asymmetric-energy B factory at the Stanford Linear Accelerator Center in California, as published in Ref. [14]. The phenomenon of CP violation allows one to distinguish between matter and antimatter, and, as such, is one of the essential ingredients needed to explain the apparent abundance of matter over antimatter in the universe. The Standard Model describes the observed elementary particles in terms of three generations of quarks and leptons, as well as the weak, electromagnetic, and strong interactions between them. In the Standard Model, CP violation is incorporated in the Cabibbo-Kobayashi-Maskawa (CKM) matrix, which describes the weak interactions between the quarks. The weak interactions between quarks are described by coupling constants that are functions of three real parameters and one irreducible complex phase. The magnitude of all CP violating effects in the Standard Model is related to this complex phase. The measurement of the CP violating phase of the CKM matrix is an important part of the present …
Date:
July 17, 2007
Creator:
Baak, Max Arjen & /Vrije U., Amsterdam
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Multilayers are enabling new science with x-ray free electron lasers
Newly developed multilayer-based mirrors and optical elements enable the imaging of high-resolution structure and ultrafast dynamics of samples with the soft X-ray free electron laser, FLASH, at DESY in Hamburg. The FLASH free-electron laser (FEL) produces intense ultrashort soft X-ray pulses with more than 10{sup 8} times higher peak brightness as compared with the most advanced synchrotron radiation sources. This allows time-resolved X-ray imaging and holography of nanostructures with a temporal resolution approaching 10 fs, opening up new studies of laser-matter interactions and the dynamics of correlated systems. In addition, the ultrafast pulses can be used to obtain structural data before the onset of radiation damage. This vastly increases the dose that can be used to record images of biological samples and hence improving the resolution of images. The extreme power of the X-ray pulses poses a challenge, and new methods are required to harness them. The methods developed here will also pave the way to imaging at upcoming hard-X-ray FELs. With those sources, atomic-resolution imaging of single uncrystallized macromolecules may become possible. In the first demonstration of ultrafast X-ray imaging at FLASH, a micron-sized test object was illuminated by a single focused coherent FEL pulse (Fig. 1). The coherent …
Date:
July 17, 2007
Creator:
Bajt, S & Chapman, H N
Object Type:
Article
System:
The UNT Digital Library
Worship for the Sake of the World - Missional Churches and the Sunday Assembly, Part 1
Lecture given Monday, September 17, 2007, 2:00 PM at Abilene Christian University: "In the Missional church, worship is mission. This workshop will explore how worship enacts a vision of God's ultimate purposes for all of creation. Practical guidance will be given for various aspects of the church's worship."
Date:
September 17, 2007
Creator:
Barton, Sara; Bulls, D.J.; Graves, Joshua & Johnson, Stephen
Object Type:
Sound
System:
The Portal to Texas History
Worship for the Sake of the World - Missional Churches and the Sunday Assembly, Part 2
Lecture given Monday, September 17, 2007, 2:00 PM at Abilene Christian University: "In the Missional church, worship is mission. This workshop will explore how worship enacts a vision of God's ultimate purposes for all of creation. Practical guidance will be given for various aspects of the church's worship."
Date:
September 17, 2007
Creator:
Barton, Sara; Bulls, D.J.; Graves, Joshua & Johnson, Stephen
Object Type:
Sound
System:
The Portal to Texas History
[Michael Brown and Ryan Collett sitting at table]
Photograph of a consultant for the Pikes, the Pi Kappa Alpha fraternity, sitting at a table for a "Meet the Pikes Night" event. Michael Brown and Ryan Collett work with the organization's head offices in Tennessee.
Date:
October 17, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library