127,891 Matching Results

Search Results

Results: 1 - 24 next
open access

CYP1B1 expression, a potential risk factor for breast cancer

Description: CYP1B1 expression in non-tumor breast tissue from breast cancer patients and cancer-free individuals was determined to test the hypothesis that high CYP1B1 expression is a risk factor for breast cancer. Large interindividual variations in CYP1B1 expression were found with CYP1B1 levels notably higher in breast cancer patients than cancer-free individuals. The results indicate that CYP1B1 might play a role in breast cancer either through increased PAH activation or through metabolism of endogeno… more
Date: May 31, 2001
Creator: Goth-Goldstein, Regine; Erdmann, Christine A. & Russell, Marion
Partner: UNT Libraries Government Documents Department
open access

Efficiency of clay-TiO2 nanocomposites on the photocatalytic eliminationof a model hydrophobic air pollutant

Description: Clay-supported TiO2 photocatalysts can potentially improve the performance of air treatment technologies via enhanced adsorption and reactivity of target volatile organic compounds (VOCs). In this study, a bench-top photocatalytic flow reactor was used to evaluate the efficiency of hectorite-TiO2 and kaolinite-TiO2, two novel composite materials synthesized in our laboratory. Toluene, a model hydrophobic VOC and a common indoor air pollutant, was introduced in the air stream at realistic concen… more
Date: January 1, 2009
Creator: Kibanova, Daria; Cervini-Silva, Javiera & Destaillats, Hugo
Partner: UNT Libraries Government Documents Department
open access

Microscopic analysis of irradiated AGR-1 coated particle fuel compacts

Description: The AGR-1 experiment involved irradiation of 72 TRISO-coated particle fuel compacts to a peak burnup of 19.5% FIMA with no in-pile failures observed out of 3×105 total particles. Irradiated AGR-1 fuel compacts have been cross-sectioned and analyzed with optical microscopy to characterize kernel, buffer, and coating behavior. Five compacts have been examined so far, spanning a range of irradiation conditions (burnup, fast fluence, and irradiation temperature) and including all four TRISO coating… more
Date: October 1, 2012
Creator: Ploger, Scott; Demkowicz, Paul; Hunn, John & Morris, Robert
Partner: UNT Libraries Government Documents Department
open access

Preliminary results of post-irradiation examination of the AGR-1 TRISO fuel compacts

Description: Five irradiated fuel compacts from the AGR-1 experiment have been examined in detail in order to assess in-pile fission product release behavior. Compacts were electrolytically deconsolidated and analyzed using the leach-burn-leach technique to measure fission product inventory in the compact matrix and identify any particles with a defective SiC layer. Loose particles were then gamma counted to measure the fission product inventory. One particle with a defective SiC layer was found in the five… more
Date: October 1, 2012
Creator: Demkowicz, Paul; Hunn, John; Morris, Robert; Harp, Jason; Winston, Philip; Baldwin, Charles et al.
Partner: UNT Libraries Government Documents Department
open access

Crystallization of Mitochondrial Respiratory Complex II fromChicken Heart: A Membrane-Protein Complex Diffracting to 2.0Angstrom

Description: Procedure is presented for preparation of diffraction-quality crystals of a vertebrate mitochondrial respiratory Complex II. The crystals have the potential to diffract to at least 2.0 Angstrom with optimization of post-crystal-growth treatment and cryoprotection. This should allow determination of the structure of this important and medically relevant membrane protein complex at near-atomic resolution and provide great detail of the mode of binding of substrates and inhibitors at the two subst… more
Date: December 17, 2004
Creator: Huang, Li-shar; Borders, Toni M.; Shen, John T.; Wang, Chung-Jen & Berry, Edward A.
Partner: UNT Libraries Government Documents Department
open access

Revisiting the Integrated Pressurized Thermal Shock Studies of an Aging Pressurized Water Reactor

Description: The Integrated Pressurized Thermal Shock (IPTS) studies were a series of studies performed in the early-mid 1980s as part of an NRC-organized comprehensive research project to confirm the technical bases for the pressurized thermal shock (PTS) rule, and to aid in the development of guidance for licensee plant-specific analyses. The research project consisted of PTS pilot analyses for three PWRs: Oconee Unit 1, designed by Babcock and Wilcox; Calvert Cliffs Unit 1, designed by Combustion Enginee… more
Date: August 1, 1999
Creator: Bryson, J. W.; Dickson, T. L.; Malik, S. N. M. & Simonen, F. A.
Partner: UNT Libraries Government Documents Department
open access

Basic Research Opportunities in Cu-Chalcopyrite Photovoltaics: Preprint

Description: A brief review is presented of fundamental research topics of primary importance to the development of improved solar cells based on chalcopyrite-structure materials. The opinions presented are a consensus opinion of the authors of the paper, with input from members of the chalcopyrite solar cells research community in the United States. Major topical areas identified included, in order of importance, are (1) development of an integrated predictive understanding of CIGS(S) materials and devices… more
Date: April 1, 1999
Creator: Rockett, A. (University of Illinois); Bhattacharya, R. N. (National Renewable Energy Laboratory); Kapur, V. (UNISUN) & Wei, S. H.
Partner: UNT Libraries Government Documents Department
open access

Higher order photon transitions in H-like and He-like ions.

Description: Higher order photon transitions such as M1, M2 and two-photon decay are conveniently studied using highly-charged electron ions. Here we discuss two examples from recent experiments which were done using the ATLAS facility at Argonne National Laboratory. The first is a test of Relativistic Quantum Mechanics involving a precision measurement of the spectral shape of the two-photon decay of the 1s2s{sup 1}S{sub 0} state in He-like nickel and the second is a test of the theory of damping in quantu… more
Date: March 8, 1999
Creator: Berry, H. G.; Cheng, S.; Curtis, L. J.; Dunford, R. W.; Kanter, E. P.; Livingston, A. E. et al.
Partner: UNT Libraries Government Documents Department
open access

Hadronic Contributions to R and G-2 from Initial-State-Radiation Data

Description: I review the recent efforts to improve the precision of the prediction of the anomalous moment of the muon, in particular of the hadronic contribution of the vacuum polarization, which is the contribution with the largest uncertainty. Focus is given to the recent result for e{sup +}e{sup -} {yields} {pi}{sup +}{pi}{sup -} by the BaBar collaboration, obtained using events with radiation in the initial state.
Date: April 6, 2012
Creator: Bernard, Denis, 1 & Polytechnique, /Ecole
Partner: UNT Libraries Government Documents Department
open access

Kinetics of phase growth in the Cu-Sn system and application to composite Nb3Sn strands

Description: Nb{sub 3}Sn is the superconductor most used in the R and D of high field accelerator magnets by either the wind and react or the react and wind technique. In order to program the low temperature steps of the heat treatment, the growth kinetics of Cu-Sn intermetallics was investigated as a function of duration and temperature. The diffusion constants of {eta}, {var_epsilon} and {delta} phases between 150 and 550 C were evaluated using Cu-Sn model samples. Statistical and systematic errors were t… more
Date: November 18, 2002
Creator: al.1, Emanuela Barzi et
Partner: UNT Libraries Government Documents Department
open access

Pulsed optically-pumped polarized H{sup {minus}} ion source development

Description: Results are presented of pulsed optically-pumped polarized H{sup {minus}} ion source (OPPIS) development for high energy accelerators. An atomic hydrogen beam intensity of 2 {times} 10{sup 18} atoms/s within the polarizer acceptance was obtained with an atomic H injector at BINP. A pulsed polarized H{sup {minus}} ion current of about 10--20 mA should be obtainable using this injector. Limitations on beam characteristics due to space-charge were studied. A polarization scheme to avoid space-char… more
Date: September 1, 1995
Creator: Zelenski, A. N.; Davydenko, V. I.; Dimov, G.I.; Levy, C. D. P.; Oers, W. T. H.; Schmor, P. W. et al.
Partner: UNT Libraries Government Documents Department
open access

Alternate configuration

Description: These vugraphs present some configurations for the Tiber tokamak. The presentation concludes that the number of components exposed to the plasma vacuum should be minimized. (JDH)
Date: January 1, 1987
Creator: Lousteau, D.C.
Partner: UNT Libraries Government Documents Department
open access

New Data and File Requirements for Tet-1

Description: A new version of Tet- is being finalized for distribution and beta-testing. The new version allows the user to create and modify the TETRAD input deck either graphically or manually. By defining Regions within the TETRAD domain and defining parameters within the regions, parameter estimation is done external to any proprietary software. The new version of Tet-1 can be run on any existing version of TETRAD, and makes identifying the TETRAD parameters to be estimated easier and more general than … more
Date: January 1, 2003
Creator: Shook, G. Michael
Partner: UNT Libraries Government Documents Department
open access

Downregulation of Protein 4.1R impairs centrosome function,bipolar spindle organization and anaphase

Description: Centrosomes nucleate and organize interphase MTs and areinstrumental in the assembly of the mitotic bipolar spindle. Here wereport that two members of the multifunctional protein 4.1 family havedistinct distributions at centrosomes. Protein 4.1R localizes to maturecentrioles whereas 4.1G is a component of the pericentriolar matrixsurrounding centrioles. To selectively probe 4.1R function, we used RNAinterference-mediated depletion of 4.1R without decreasing 4.1Gexpression. 4.1R downregulation r… more
Date: March 17, 2006
Creator: Spence, Jeffrey R.; Go, Minjoung M.; Bahmanyar, S.; Barth,A.I.M. & Krauss, Sharon Wald
Partner: UNT Libraries Government Documents Department
open access

Progress in Photovoltaic Components and Systems

Description: The Photovoltaic Manufacturing Research and Development project is a government/industry partnership between the US Department of Energy and members of the US photovoltaic (TV) industry. The purpose of the project is to work with industry to improve manufacturing processes, reduce manufacturing costs, and improve the performance of PV products. This project is conducted through phased solicitations with industry participants selected through a competitive evaluation process. Starting in 1995, t… more
Date: July 15, 2000
Creator: Thomas, H.; Kroposki, B.; Witt, C. & Bower, Ward I.
Partner: UNT Libraries Government Documents Department
open access

The interplay of matrix metalloproteinases, morphogens and growth factors is necessary for branching of mammary epithelial cells

Description: The mammary gland develops its adult form by a process referred to as branching morphogenesis. Many factors have been reported to affect this process. We have used cultured primary mammary epithelial organoids and mammary epithelial cell lines in three-dimensional collagen gels to elucidate which growth factors, matrix metalloproteinases (MMPs) and mammary morphogens interact in branching morphogenesis. Branching stimulated by stromal fibroblasts, epidermal growth factor, fibroblast growth fact… more
Date: March 6, 2002
Creator: Simian, M.; Harail, Y.; Navre, M.; Werb, Z.; Lochter, A. & Bissell, M.J.
Partner: UNT Libraries Government Documents Department
open access

Visualization of a Deterministic Radiation Transport Model Using Standard Visualization Tools

Description: Output from a deterministic radiation transport code running on a CRAY SV1 is imported into a standard distributed, parallel, visualization tool for analysis. Standard output files, consisting of tetrahedral meshes, are imported to the visualization tool through the creation of a application specific plug-in module. Visualization samples are included, providing visualization of steady state results. Different plot types and operators are utilized to enhance the analysis and assist in reporting … more
Date: May 1, 2004
Creator: Galbraith, James A. & Greenwade, L. Eric
Partner: UNT Libraries Government Documents Department
open access

High-intensity sources for light ions

Description: The use of the multicusp plasma generator as a source of light ions is described. By employing radio-frequency induction discharge, the performance of the multicusp source is greatly improved, both in lifetime and in high brightness H{sup +} and H{sup {minus}} beam production. A new technique for generating multiply-charged ions in this type of ion source is also presented.
Date: October 1, 1995
Creator: Leung, K. N.
Partner: UNT Libraries Government Documents Department
open access

Multiplicative or t1 Noise in NMR Spectroscopy

Description: The signal in an NMR experiment is highly sensitive to fluctuations of the environment of the sample. If, for example, the static magnetic field B{sub 0}, the amplitude and phase of radio frequency (rf) pulses, or the resonant frequency of the detection circuit are not perfectly stable and reproducible, the magnetic moment of the spins is altered and becomes a noisy quantity itself. This kind of noise not only depends on the presence of a signal, it is in fact proportional to it. Since all the … more
Date: January 25, 2005
Creator: Granwehr, Josef
Partner: UNT Libraries Government Documents Department
open access

Insertion of a self-splicing intron into the mtDNA of atriploblastic animal

Description: Nephtys longosetosa is a carnivorous polychaete worm that lives in the intertidal and subtidal zones with worldwide distribution (pleijel&rouse2001). Its mitochondrial genome has the characteristics typical of most metazoans: 37 genes; circular molecule; almost no intergenic sequence; and no significant gene rearrangements when compared to other annelid mtDNAs (booremoritz19981995). Ubiquitous features as small intergenic regions and lack of introns suggested that metazoan mtDNAs are under … more
Date: April 14, 2006
Creator: Valles, Y.; Halanych, K. & Boore, J.L.
Partner: UNT Libraries Government Documents Department
open access

Performance of the LAMPF H$sup -$ injector

Description: No Description Available.
Date: January 1, 1974
Creator: Allison, P. W.; Meyer, E. A.; Mueller, D. W. & Stevens, R. R. Jr.
Partner: UNT Libraries Government Documents Department
open access

Approaches and results for recent shutdown risk studies in the US

Description: This paper provides a description of the methods/approaches used in three contemporary Probabilistic Safety Assessments for two PWRs (Seabrook and Surry) and for one BWR (Grand Gulf ). The results for the core damage frequency for those studies and the most important contributors are discussed. A summary of the novel approaches (when compared to PSAs for power operation) introduced in these studies is provided.
Date: September 1, 1995
Creator: Hanan, N.A. & Bhattacharyya, S.K.
Partner: UNT Libraries Government Documents Department
open access

More modular invariant anomalous U(1) breaking

Description: We consider the case of several scalar fields, charged under a number of U(1) factors, acquiring vacuum expectation values due to anomalous U(1). We demonstrate how to make redefinitions at the superfield level in order to account for tree-level exchange of vector supermultiplets in the effective supergravity theory of the light fields in the supersymmetric vacuum phase. Our approach builds up on previous results that we obtained in a more elementary case. We find that the modular weights of li… more
Date: June 27, 2002
Creator: Gaillard, Mary K. & Giedt, Joel
Partner: UNT Libraries Government Documents Department
Back to Top of Screen