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494 Matching Results
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Doctoral Recital: 2004-03-08 – Michael Adduci, oboe
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
March 8, 2004
Creator:
Adduci, Michael
Object Type:
Sound
System:
The UNT Digital Library
{sup 17}O NMR Investigation of Oxidative Degradation in Polymers Under Gamma-Irradiation
The {gamma}-irradiated-oxidation of pentacontane (C{sub 50}H{sub 102}) and the polymer polyisoprene was investigated as a function of oxidation level using {sup 17}O nuclear magnetic resonance (NMR) spectroscopy. It is demonstrated that by using {sup 17}O labeled O{sub 2} gas during the {gamma}-irradiation process, details about the oxidative degradation mechanisms can be directly obtained from the analysis of the {sup 17}O NMR spectra. Production of carboxylic acids is the primary oxygen-containing functionality during the oxidation of pentacontane, while ethers and alcohols are the dominant oxidation product observed for polyisoprene. The formation of ester species during the oxidation process is very minor for both materials, with water also being produced in significant amounts during the radiolytic oxidation of polyisoprene. The ability to focus on the oxidative component of the degradation process using {sup 17}O NMR spectroscopy demonstrates the selectivity of this technique over more conventional approaches.
Date:
March 8, 2000
Creator:
Alam, Todd M.; Celina, Mathias C.; Assink, Roger A.; Clough, Roger Lee & Gillen, Kenneth T.
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 23, No. 10, Ed. 1 Thursday, March 8, 2007
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 8, 2007
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 105, No. 305, Ed. 1 Monday, March 8, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 8, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 285, Ed. 1 Tuesday, March 8, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 8, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The United States and Europe: Possible Options for U.S. Policy
None
Date:
March 8, 2005
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
X-ray absorption study of the electronic structure of Mn-doped amorphous Si
The electronic structure of Mn in amorphous Si (a-Mn{sub x}Si{sub 1?x}) is studied by X-ray absorption spectroscopy at the Mn L{sub 3,2} edges for x = 0.005-0.18. Except the x = 0.005 sample, which shows a slight signature of Mn{sup 2+} atomic multiplets associated with a local Mn moment, all samples have broad and featureless L{sub 3,2} absorption peaks, corresponding to an itinerant state for all 3d electrons. The broad X-ray absorption spectra exclude the possibility of a localized 3d moment and explain the unexpectedly quenched Mn moment in this magnetically-doped amorphous semiconductor. Such a fully delocalized d state of Mn dopant in Si has not been previously suggested.
Date:
March 8, 2008
Creator:
Arenholz, Elke; Zeng, Li; Huegel, A.; Helgren, E.; Hellman, F.; Piamonteze, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Status of the Yucca Mountain Project, License Application, and Repository Design Update
None
Date:
March 8, 2005
Creator:
Artur, W. John, III
Object Type:
Presentation
System:
The UNT Digital Library
Quantifying Stratospheric Ozone in the Upper Troposphere Using in situ Measurements of HCl
A chemical ionization mass spectrometry (CIMS) technique has been developed for precise in situ measurements of hydrochloric acid (HCl) from a high-altitude aircraft. In measurements at subtropical latitudes, minimum HCl values found in the upper troposphere (UT) are often near or below the 0.005-ppbv detection limit of the measurements, indicating that background HCl values are much lower than a global mean estimate. However, significant abundances of HCl were observed in many UT air parcels as a result of stratosphere-to-troposphere transport events. A method for diagnosing the amount of stratospheric ozone in these UT parcels was developed using the compact linear correlation of HCl with ozone found throughout the lower stratosphere (LS). Expanded use of this method will lead to improved quantification of cross-tropopause transport events and validation of global chemical transport models.
Date:
March 8, 2004
Creator:
Atherton, C. S.; Bergmann, D. J.; Marcy, T. P.; Fahey, D. W.; Gao, R. S.; Popp, P. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, February 2001.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
March 8, 2001
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Effect of Workbench Shielding on Nagasaki Factory Workers' Dose
None
Date:
March 8, 2001
Creator:
Azmy, Y.Y.
Object Type:
Report
System:
The UNT Digital Library
Improvements in bis(cyclopentadienyl)magnesium purity as determined with gas chromatography-mass spectroscopy
Bis(cyclopentadienyl)magnesium (MgCp2) is used commonly as a source for doping nitride materials with magnesium. Increased oxygen incorporation known to accompany the use of MgCp2 makes the purity of this precursor an important consideration in nitride CVD. Gas chromatography-mass spectroscopy (GCMS) methods have now been developed for the identification of volatile impurities in MgCp2. Diethylether, an oxygen containing organic compound (CH{sub 3}CH{sub 2}OCH{sub 2}CH{sub 3}), and additional organic impurities were found in the MgCp2 supplied by three manufacturers. Subsequent refinements in the synthetic processes by these companies have resulted in the availability of MgCp2 free of ether and other organic impurities as determined by GCMS.
Date:
March 8, 2000
Creator:
BARTRAM,MICHAEL E.
Object Type:
Article
System:
The UNT Digital Library
CDF Run I B physics results
The CDF Run I B physics program has been very successful, making numerous measurements over a wide variety of B physics topics. Measurements have included masses and lifetimes; discovery of the B{sub c}; B{sub s} {r_arrow} J/{psi}{phi} polarization; B{sup 0} {leftrightarrow} {bar B}{sup 0} mixing; sin (2{beta}); and rare decay limits. Recent results include a search for {Lambda}{sub b} {r_arrow} {Lambda}{gamma} and a study of B{sup 0} {r_arrow} J/{psi}K(*){sup 0} {pi}{sup +}{pi}{sup {minus}} decays. The tools and experience developed during Run I are quite valuable as CDF enters Run II.
Date:
March 8, 2001
Creator:
Bailey, S.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 31, No. 20, Ed. 1 Friday, March 8, 2002
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 8, 2002
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Abandoned Mine Land Fund Reauthorization: Selected Issues
This report provides a summary of the structure of the Abandon Mine Land (AML) program, distribution of funds, and discusses major proposals considered in the 108th Congress.
Date:
March 8, 2005
Creator:
Bamberger, Robert L.
Object Type:
Report
System:
The UNT Digital Library
Hot isostatic pressing of ceramic waste from spent nuclear fuel.
Argonne National Laboratory has developed a process to immobilize waste salt containing fission products, uranium, and transuranic elements as chlorides in a glass-bonded ceramic waste form. This salt was generated in the electrorefining operation used in electrometallurgical treatment of spent Experimental Breeder Reactor-II fuel. The ceramic waste process culminated with a hot isostatic pressing operation. This paper reviews the installation and operation of a hot isostatic press in a radioactive environment. Processing conditions for the hot isostatic press are presented for non-irradiated material and irradiated material. Sufficient testing was performed to demonstrate that a hot isostatic press could be used as the final step of the processing of ceramic waste for the electrometallurgical spent fuel treatment process.
Date:
March 8, 2002
Creator:
Bateman, Kenneth J.; Rigg, Richard H. & Wiest, James D.
Object Type:
Article
System:
The UNT Digital Library
Imaging System for the Automated Determination of Microscopical Properties in Hardened Portland Concrete
During this CRADA, Honeywell FM and T and MoDOT personnel designed a unique scanning system (including both hardware and software) that can be used to perform an automated scan and evaluation of a concrete sample. The specific goals of the CRADA were: (1) Develop a combined system integration, image acquisition, and image analysis approach to mimic the manual scanning and evaluation process. Produce a prototype system which can: (a) automate the scanning process to improve its speed and efficiency; (b) reduce operator fatigue; and (c) improve the consistency of the evaluation process. (2) Capture and preserve the baseline knowledge used by the MoDOT experts in performing the evaluation process. At the present time, the evaluation expertise resides in two MoDOT personnel. Automation of the evaluation process will allow that knowledge to be captured, preserved, and used for training purposes. (3) Develop an approach for the image analysis which is flexible and extensible in order to accommodate the inevitable pathologies that arise in the evaluation process. Such pathologies include features such as cracks and fissures, voids filled with paste or debris, and multiple, overlapping voids. FM and T personnel used image processing, pattern recognition, and system integration skills developed for other …
Date:
March 8, 2000
Creator:
Baumgart, C.W.; Cave, S.P. & Linder, K.E.
Object Type:
Report
System:
The UNT Digital Library
Development of a low-power, low-cost front end electronics module for large scale distributed neutrino detectors
A number of concepts have been presented for distributed neutrino detectors formed of large numbers of autonomous detectors. Examples include the Antarctic Ross Ice Shelf Antenna Neutrino Array (ARIANNA) [Barwick 2006], as well as proposed radio extensions to the IceCube detector at South Pole Station such as AURA and IceRay. [Besson 2008]. We have focused on key enabling technical developments required by this class of experiments. The radio Cherenkov signal, generated by the Askaryan mechanism [Askaryan 1962, 1965], is impulsive and coherent up to above 1 GHz. In the frequency domain, the impulsive character of the emission results in simultaneous increase of the power detected in multiple frequency bands. This multiband triggering approach has proven fruitful, especially as anthropogenic interference often results from narrowband communications signals. A typical distributed experiment of this type consists of a station responsible for the readout of a cluster of antennas either near the surface of the ice or deployed in boreholes. Each antenna is instrumented with a broadband low-noise amplifier, followed by an array of filters to facilitate multi-band coincidence trigger schemes at the antenna level. The power in each band is detected at the output of each band filter, using either square-law diode …
Date:
March 8, 2008
Creator:
Beatty, James J. & Kass, Richard D.
Object Type:
Report
System:
The UNT Digital Library
Regulation of Plant-Based Pharmaceuticals
None
Date:
March 8, 2005
Creator:
Becker, Geoffrey S. & Vogt, Donna U.
Object Type:
Report
System:
The UNT Digital Library
Soft Radiative Strength in Warm Nuclei
Unresolved transitions in the nuclear {gamma}-ray cascade produced in the decay of excited nuclei are best described by statistical concepts: a continuous radiative strength function (RSF) and level density yield mean values of transition matrix elements. Data on the soft (E{sub {gamma}} < 3-4 MeV) RSF for transitions between warm states (i.e. states several MeV above the yrast line) have, however, remained elusive.
Date:
March 8, 2004
Creator:
Becker, J. A.; Bernstein, L. A.; Garrett, P. E.; Nelson, R. O.; Schiller, A.; Voinov, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Defect diffusion during annealing of low-energy ion-implanted silicon
We present a new approach for investigating the kinetics of defect migration during annealing of low-energy, ion-implanted silicon, employing a combination of computer simulations and atomic-resolution tunneling microscopy. Using atomically-clean Si(111)-7x7 as a sink for bulk point defects created by 5 keV Xe and Ar irradiation, we observe distinct, temperature-dependent surface arrival rates for vacancies and interstitials. A combination of simulation tools provides a detailed description of the processes that underly the observed temperature-dependence of defect segregation, and the predictions of the simulations agree closely with the experimental observations.
Date:
March 8, 2000
Creator:
Bedrossian, P J; Caturla, M-J & Diaz de la Rubia, T
Object Type:
Article
System:
The UNT Digital Library
Environmental Solutions, A Summary of Contributions for CY04: Battelle Contributions to the Waste Treatment Plant
In support of the Waste Treatment Plant (WTP), Battelle conducted tests on mixing specific wastes within the plant, removing troublesome materials from the waste before treatment, and determining if the final waste forms met the established criteria. In addition, several Battelle experts filled full-time positions in WTP's Research and Testing and Process and Operations departments.
Date:
March 8, 2005
Creator:
Beeman, Gordon H.
Object Type:
Report
System:
The UNT Digital Library
Research, Rummage, and Reconnoiter: Online Exploration at The Portal to Texas History
This presentation discusses what The Portal to Texas History is and the benefits that it provides to the community and to educators. It also illustrates how to use The Portal to Texas History, shows examples of the collections, and discusses future goals.
Date:
March 8, 2007
Creator:
Belden, Dreanna
Object Type:
Presentation
System:
The UNT Digital Library
Web technology to support work processes in energy policy research - A case study with energy efficiency standards
This paper focuses on a process to design and build a web-based system to assist staff in day-to-day management and contemporaneous documentation of their work. Other groups that want to use web technology to support their work could apply the approach presented here, but the design itself pertains to a particular set of issues in a unique context. Each user must apply the approach to identify their objectives and design a site to meet them. The main question that the Energy Efficiency Standards Group addressed was: ''How can we facilitate documentation of interim results and final products while conducting a complex, interdependent set of analyses by multiple authors under time pressures for delivering a final product?'' The approach to address this question includes categorization of the components of the work, discussions with staff, development of infrastructure support for documentation, implementation of the documentation process and integration with the workflow, and follow- up with staff. The search for a solution raised a number of issues such as the need for a thorough understanding of the work, consensus building by inclusion of key staff, and deliverable scheduling to allow for contemporaneous documentation. Documentation results vary among the product analyses, from extensive internal …
Date:
March 8, 2002
Creator:
Benenson, Peter; McMahon, James E. & Brown, Stephen R.
Object Type:
Article
System:
The UNT Digital Library