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Sensitivity study of CO2 storage capacity in brine aquifers withclosed boundaries: Dependence on hydrogeologic properties

Description: In large-scale geologic storage projects, the injected volumes of CO{sub 2} will displace huge volumes of native brine. If the designated storage formation is a closed system, e.g., a geologic unit that is compartmentalized by (almost) impermeable sealing units and/or sealing faults, the native brine cannot (easily) escape from the target reservoir. Thus the amount of supercritical CO{sub 2} that can be stored in such a system depends ultimately on how much pore space can be made available for … more
Date: February 7, 2007
Creator: Zhou, Q.; Birkholzer, J.; Rutqvist, J. & Tsang, C-F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Temperature sensitivity of Cu K(alpha) imaging efficiency using a spherical Bragg reflecting crystal

Description: The Vulcan laser facility at the Rutherford Appleton Laboratory was used to study the interaction of a 75 J 10 ps, high intensity laser beam with low-mass solid, Cu targets. Two instruments were fielded as diagnostics of the Cu K-shell emission from the targets: A single photon counting CCD spectrometer provided the absolute K{sub {alpha}} yield and a spherically bent Bragg crystal recorded 2D monochromatic images with a spatial resolution of 10 {micro}m. Due to the shifting and broadening of t… more
Date: August 7, 2006
Creator: Akli, K. U.; Key, M. H.; Chung, H. K.; Hansen, S. B.; Freeman, R. R.; Chen, M. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

ANALYTICAL METHOD FOR MEASURING TOTAL PROTIUM AND TOTAL DEUTERIUM IN A GAS MIXTURE CONTAINING H2, D2,AND HD VIA GAS CHAROMATOGRAPHY

Description: The most common analytical method of identifying and quantifying non-radioactive isotopic species of hydrogen is mass spectrometry. A low mass, high resolution mass spectrometer with adequate sensitivity and stability to identify and quantify hydrogen isotopes in the low ppm range is an expensive, complex instrument. A new analytical technique has been developed that measures both total protium (H) and total deuterium (D) in a gas mixture containing H{sub 2}, D{sub 2}, and HD using an inexpensi… more
Date: August 7, 2007
Creator: Sessions, H
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New Observables In the Decay Mode \bar B_d \-->\bar K^{0*} \ell^+ \ell^-

Description: We discuss the large set of observables available from the angular distributions of the decay {bar B}{sub d} {yields} {bar K}*{sup 0}{ell}{sup +}{ell}{sup -}. We present a NLO analysis of all observables based on the QCD factorization approach in the low-dilepton mass region and an estimate of {Lambda}/m{sub b} corrections. Moreover, we discuss their sensitivity to new physics. We explore the experimental sensitivities at LHCb (10 fb{sup -1}) and SuperLHCb (100 fb{sup -1}) based on a full-angul… more
Date: August 7, 2008
Creator: Egede, U.; /Imperial Coll., London; Hurth, T.; /SLAC, /CERN; Matias, J.; Ramon, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Cost Effective Multi-Spectral Scanner for Natural Gas Detection

Description: The objective of this project is to design, fabricate and demonstrate a cost effective, multi-spectral scanner for natural gas leak detection in transmission and distribution pipelines. During the first year of the project, a laboratory version of the multi-spectral scanner was designed, fabricated, and tested at EnUrga Inc. The multi-spectral scanner was also evaluated using a blind Department of Energy study at the Rocky Mountain Oilfield Testing Center. The performance of the scanner was inc… more
Date: December 7, 2005
Creator: Sivathanu, Yudaya; Lim, Jongmook; Narayanan, Vinoo & Park, Seonghyeon
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High Pressure Structure of Half-Metallic CrO2

Description: Evidence for a structural phase transition from rutile {alpha}-CrO{sub 2} phase I (P4{sub 2}/mnm) to orthorhombic {beta}-CrO{sub 2} phase II (CaCl{sub 2}-like, Pnnm) is presented using angle-resolved synchrotron x-ray diffraction and high sensitivity confocal Raman spectroscopy. The transition to the CaCl{sub 2} structure, which appears to be second-order, occurs at 12 {+-} 3 GPa without any measurable discontinuity in volume, but is accompanied by an apparent increase in compressibility. Raman… more
Date: September 7, 2005
Creator: Maddox, B.; Yoo, C. S.; Kasinathan, D.; Pickett, W. E. & Scalettar, R. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeling and Simulation of the Longitudinal Beam Dynamics - RF Station Interaction in the LHC Rings

Description: A non-linear time-domain simulation has been developed to study the interaction between longitudinal beam dynamics and RF stations in the LHC rings. The motivation for this tool is to determine optimal LLRF configurations, to study system sensitivity on various parameters, and to define the operational and technology limits. It will be also used to study the effect of RF station noise, impedance, and perturbations on the beam life time and longitudinal emittance. It allows the study of alternat… more
Date: July 7, 2008
Creator: Mastorides, T; Rivetta, C.; Fox, J. D.; Winkle, D.Van; Baudrenghien, P. & Tuckmantel, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Impact of Geoengineering Schemes on the Global Hydrological Cycle

Description: The rapidly rising CO{sub 2} level in the atmosphere has led to proposals of climate stabilization via 'Geoengineering' schemes that would mitigate climate change by intentionally reducing the solar radiation incident on earth's surface. In this paper, we address the impact of these climate stabilization schemes on the global hydrological cycle, using equilibrium simulations from an atmospheric general circulation model coupled to a slab ocean model. We show that insolation reductions sufficien… more
Date: December 7, 2007
Creator: Bala, G.; Duffy, P. & Taylor, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Confidence Level and Sensitivity Limits in High Contrast Imaging

Description: In long adaptive optics corrected exposures, exoplanet detections are currently limited by speckle noise originating from the telescope and instrument optics, and it is expected that such noise will also limit future high-contrast imaging instruments for both ground and space-based telescopes. Previous theoretical analysis have shown that the time intensity variations of a single speckle follows a modified Rician. It is first demonstrated here that for a circular pupil this temporal intensity d… more
Date: November 7, 2007
Creator: Marois, C
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Shock initiation of explosive pellets at low temperature. [PETN, PBX-9407, HNS-1]

Description: Electrically-driven flyer plates have been used to initiate the high explosives PETN, PBX-9407 and HNS-1 at 194/sup 0/K and 77/sup 0/K. Electrically-exploded aluminum foils accelerated 51-..mu..m thick plastic flyer plates to impact the explosive pellets. The flyer-plate components and the explosive pellets were cooled to the desired temperature by immersing them in dry ice (194/sup 0/K) or liquid nitrogen (77/sup 0/K). Two firing systems were used. In one system a 0.6..mu..F capacitor supplies… more
Date: February 7, 1979
Creator: Gilman, D.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Foundations for Improvements to Passive Detection Systems - Final Report

Description: This project explores the scientific foundation and approach for improving passive detection systems for plutonium and highly enriched uranium in real applications. Sources of gamma-ray radiation of interest were chosen to represent a range of national security threats, naturally occurring radioactive materials, industrial and medical radiation sources, and natural background radiation. The gamma-ray flux emerging from these sources, which include unclassified criticality experiment configurati… more
Date: October 7, 2004
Creator: Labov, S E; Pleasance, L; Sokkappa, P; Craig, W; Chapline, G; Frank, M et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Study of undulator magnets characterization using the Vibrating Wire technique

Description: The vibrating wire (VW) technique employs a stretched wire as a magnetic field sensor. Because of the wire's small diameter ({approx}0.1mm or smaller) and because the wire can be supported from outside the magnet, this technique is very appealing for field measurements in small gap/bore undulators with small good field regions and with limited access to the tested field. In addition, in the case of elliptical undulators in which Hall probe (HP) measurements can be affected by the planar Hall ef… more
Date: February 7, 2011
Creator: Temnykh, Alexander; Levashov, Yurii & Wolf, Zachary
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

New Perspectives for QCD Physics at the LHC

Description: I review a number of topics where conventional wisdom relevant to hadron physics at the LHC has been challenged. For example, the initial-state and final-state interactions of the quarks and gluons entering perturbative QCD hard-scattering subprocesses lead to the breakdown of traditional concepts of factorization and universality for transverse-momentum-dependent observables at leading twist. These soft-gluon rescattering effect produce single-spin asymmetries, the breakdown of the Lam-Tung re… more
Date: February 7, 2011
Creator: Brodsky, Stanley J. & /SLAC /Stanford U. /Southern Denmark U., CP3-Origins
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Flameless atomic absorption determination of beryllium in the presence of various anions and cations

Description: A method for determining trace amounts of beryllium in the presence of various anions and cations is described. The method involves use of a Perkin-Elmer Model 503 spectrophotometer equipped with an HGA-2100 graphite furnace. The absorption signal from 20 ng/ml of beryllium varies significantly from acid to acid, and both 5 percent (V/V) nitric acid and 5 percent (V/V) sulfuric acid were studied as possible analysis solvents. Absorption signal enhancement and suppression caused by the presence … more
Date: May 7, 1976
Creator: Hurlbut, J. A. & Bokowski, D. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiosensitivity profiles from a panel of ovarian cancer cell lines exhibiting genetic alterations in p53 and disparate DNA-dependent protein kinase activities

Description: The variability of radiation responses in ovarian tumors and tumor-derived cell lines is poorly understood. Since both DNA repair capacity and p53 status can significantly alter radiation sensitivity, we evaluated these factors along with radiation sensitivity in a panel of sporadic human ovarian carcinoma cell lines. We observed a gradation of radiation sensitivity among these sixteen lines, with a five-fold difference in the LD50 between the most radiosensitive and the most radioresistant cel… more
Date: September 7, 2009
Creator: Langland, Gregory T.; Yannone, Steven M.; Langland, Rachel A.; Nakao, Aki; Guan, Yinghui; Long, Sydney B.T. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Determination of beryllium in urine, hair, fingernail, and fecal samples by flameless atomic absorption spectrometry

Description: Methods for determining trace amounts of beryllium in urine, hair, fingernail, and fecal samples are described. These methods involve use of a Perkin-Elmer Model 503 spectrophotometer equipped with an HGA-2100 graphite furnace. Lanthanum was used as a masking and enhancing agent, and recoveries were determined by direct comparison with aqueous standards. The hair and fingernail samples were degraded readily in a nitric acid-perchloric acid mixture, and the feces were digested rapidly using a fe… more
Date: May 7, 1976
Creator: Hurlbut, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Boron-Lined Neutron Detector Measurements

Description: PNNL-18938 Revision Radiation portal monitors used for interdiction of illicit materials at borders include highly sensitive neutron detection systems. The main reason for having neutron detection capability is to detect fission neutrons from plutonium. The currently deployed radiation portal monitors (RPMs) from Ludlum and Science Applications International Corporation (SAIC) use neutron detectors based upon 3He-filled gas proportional counters, which are the most common large neutron detector… more
Date: March 7, 2010
Creator: Lintereur, Azaree T.; Kouzes, Richard T.; Ely, James H.; Erikson, Luke E.; Siciliano, Edward R. & Woodring, Mitchell L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High Density Nano-Electrode Array for Radiation Detection

Description: Bulk single crystals of Cd1-xZnxTe (x=0.04 to x=0.2) compound semiconductor is used for room temperature radiation detection. The production of large volume of Cd1-xZnxTe with low defect density is expensive. As a result there is a growing research interest in the production of nanostructured compound semiconductors such as Cd1-xZnxTe in an electrochemical route. In this investigation, Cd1-xZnxTe ternary compound semiconductor, referred as CZT, was electrodeposited in the form of nanowires onto… more
Date: May 7, 2010
Creator: Misra, Mano
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Microfield exposure tool enables advances in EUV lithography development

Description: With demonstrated resist resolution of 20 nm half pitch, the SEMATECH Berkeley BUV microfield exposure tool continues to push crucial advances in the areas of BUY resists and masks. The ever progressing shrink in computer chip feature sizes has been fueled over the years by a continual reduction in the wavelength of light used to pattern the chips. Recently, this trend has been threatened by unavailability of lens materials suitable for wavelengths shorter than 193 nm. To circumvent this roadbl… more
Date: September 7, 2009
Creator: Naulleau, Patrick
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Weighing the Costs and Benefits of State Renewables Portfolio Standards in the United States: A Comparative Analysis of State-Level Policy Impact Projections

Description: State renewables portfolio standards (RPS) have emerged as one of the most important policy drivers of renewable energy capacity expansion in the U.S. As RPS policies have been proposed or adopted in an increasing number of states, a growing number of studies have attempted to quantify the potential impacts of these policies, focusing primarily on cost impacts, but sometimes also estimating macroeconomic, risk reduction, and environmental effects. This article synthesizes and analyzes the resul… more
Date: January 7, 2008
Creator: Chen, Cliff; Wiser, Ryan; Mills, Andrew & Bolinger, Mark
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-Level Waste Glass Formulation Model Sensitivity Study 2009 Glass Formulation Model Versus 1996 Glass Formulation Model

Description: This document presents the differences between two HLW glass formulation models (GFM): The 1996 GFM and 2009 GFM. A glass formulation model is a collection of glass property correlations and associated limits, as well as model validity and solubility constraints; it uses the pretreated HLW feed composition to predict the amount and composition of glass forming additives necessary to produce acceptable HLW glass. The 2009 GFM presented in this report was constructed as a nonlinear optimization c… more
Date: December 7, 2009
Creator: Belsher, J. D. & Meinert, F. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computation of Three Dimensional Tokamak and Spherical Torus Equilibria

Description: A nominally axisymmetric plasma con�guration, such as a tokamak or a spherical torus, is highly sensitive to non-axisymmetric magnetic perturbations due to currents outside of the plasma. The high sensitivity means that the primary interest is in the response of the plasma to very small perturbations, | →(over) β/→(over)Β | ≈ 10–2 to 10–4, which can be calculated using the theory of perturbed equilibria. The Ideal Perturbed Equilibrium Code (IPEC) is described and applied to the study of the pl… more
Date: May 7, 2007
Creator: Jong-kyu Park, Allen H. Boozer, and Alan H. Glasser
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Recent Developments in Neutron Detection and Multiplicity Counting with Liquid Scintillator

Description: For many years at LLNL we have been developing time-correlated neutron detection techniques and algorithms for many applications including Arms Control, Threat Detection and Nuclear Material Assaying. Many of our techniques have been developed specifically for relatively low efficiency (a few %) inherent in the man-portable systems. Historically we used thermal neutron detectors (mainly {sup 3}He) taking advantage of the high thermal neutron interaction cross-sections but more recently we have … more
Date: January 7, 2010
Creator: Nakae, L F; Kerr, P L; Newby, R J; Prasad, M K; Rowland, M S; Snyderman, N J et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Demonstration of the BNL Continuous Dual Trap Analyzer to Detect Perfluorocarbon Tracers for the Tag, Track and Location Program

Description: The Tag, Track and Location System (TTL) Program is investigating methods of tracking an asset using perfluorocarbon tracers (PFT). The success of any TTL method requires sound detection/location instrumentation. Tracer Detection Technologies Corp (TDT), through a contract with the Office of Naval Research (ONR), is investigating different detection systems. The detections systems generally fall into two categories; proximity detectors and standoff detectors. Proximity detectors, as the name im… more
Date: October 7, 2008
Creator: Heiser,J.H.; Adams, J.; Dietz, R..; Milian, L. & Watson, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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