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Fiscal Year 2004
15
Fiscal Year 2005
12
OIT Tip Sheets
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Habitat Evaluation Procedures Report
10
Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products Quarterly Report
6
Small Wind Electric Systems Consumers' Guides
6
Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems Quarterly Report
5
Proceedings of RIKEN BNL Research Center Workshop
5
Refractory for Black Liquor Gasifiers Quarterly Report
5
Analysis of Devonian Black Shales in Kentucky for Potential Carbon Dioxide Sequestration and Enhanced Natural Gas Production Quarterly Report
4
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8,160 Matching Results
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About NICADD extruded scintillating strips
The results of control measurements of extruded scintillating strip responses to a radioactive source Sr-90 are provided, and details of strip choice, preparation, and method of measurement are included. About four hundred one meter long extruded scintillating strips were measured at four different points. These results were essential for prototyping a tail catcher and muon tracker for a future international electron positron linear collider detector.
Date:
April 1, 2005
Creator:
Dyshkant, A.; Beznosko, D.; Blazey, G.; Chakraborty, D.; Francis, K.; Kubik, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Absolute calibration of the Auger fluorescence detectors
Absolute calibration of the Pierre Auger Observatory fluorescence detectors uses a light source at the telescope aperture. The technique accounts for the combined effects of all detector components in a single measurement. The calibrated 2.5 m diameter light source fills the aperture, providing uniform illumination to each pixel. The known flux from the light source and the response of the acquisition system give the required calibration for each pixel. In the lab, light source uniformity is studied using CCD images and the intensity is measured relative to NIST-calibrated photodiodes. Overall uncertainties are presently 12%, and are dominated by systematics.
Date:
July 1, 2005
Creator:
Bauleo, P.; Brack, J.; Garrard, L.; Harton, J.; Knapik, R.; Meyhandan, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Absolute X-Ray Yields From Laser-Irradiated, Ge-Doped Aerogel Targets
Bright, multi-keV x-ray sources are essential for radiography of inertial-confinement fusion (ICF) experiments. In this context, there are two parameters of importance: the energy of the emitted photons, which determines how penetrating the x-rays are for radiographic purposes, and the brightness of the source, which determines the ability of a radiograph to resolve small features. As ICF experiments continue to get larger, such as those that will be carried out at the National Ignition Facility at Lawrence Livermore National Laboratory, or at the French Commissariat a l'Energie Atomique's (CEA) Laser MegaJoule, and compression in fuel capsules gets higher, sources for x-ray backlighting will have to have harder-photon spectra. For a given laser energy available to drive the multi-keV x-ray-backlight source, the only way for the source to get brighter is for it to convert the laser to x-rays more efficiently. We have been developing and characterizing laser-driven, underdense x-ray sources that are highly efficient in recent years [2-5]. CEA researchers have also recently had great success efficiently making multi-keV x-rays from pre-pulsed foils [6].
Date:
June 15, 2005
Creator:
Fournier, K. B.; Tobin, M.; Poco, J. F.; Bradley, K.; Coverdale, C. A.; Beutler, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Absolute X-Ray Yields from Laser-Irradiated, Ge-doped Aerogel Targets
None
Date:
July 1, 2005
Creator:
Fournier, K. B.; Tobin, M.; Poco, J. F.; Bradley, K.; Coverdale, C. A.; Beutler, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Absorbed XFEL dose in the components of the LCLS X-Ray Optics
We list the materials that are anticipated to be placed into the Linac Coherent Light Source (LCLS) x-ray free electron laser (XFEL) beam line, their positions, and the absorbed dose, and compare this dose with anticipated damage thresholds.
Date:
September 27, 2005
Creator:
Hau-Riege, S.
Object Type:
Report
System:
The UNT Digital Library
Abstract Proceedings Signal and Image Sciences Workshop 2005
None
Date:
November 3, 2005
Creator:
Azevedo, S G
Object Type:
Article
System:
The UNT Digital Library
Abundance of Green Tree Frogs and Insects in Artificial Canopy Gaps in a Bottomland Hardwood Forest.
ABSTRACT - We found more green tree frogs ( Hyla cinerea) n canopv gaps than in closed canopy forest. Of the 331 green tree frogs observed, 88% were in canopv gaps. Likewise, higher numbers and biomasses of insects were captured in the open gap habitat Flies were the most commonlv collected insect group accounting for 54% of the total capture. These data suggest that one reason green tree frogs were more abundant in canopy gaps was the increased availability of prey and that small canopy gaps provide early successional habitats that are beneficial to green tree frog populations.
Date:
April 1, 2005
Creator:
Horn, Scott; Hanula, James, L.; Ulyshen, Michael D. & Kilgo, John, C.
Object Type:
Article
System:
The UNT Digital Library
Abundance of green tree frogs and insects in artificial canopy gaps in a bottomland hardwood forest.
Horn, Scott, James L. Hanula, Michael D. Ulyshen, and John C. Kilgo. 2005. Abundance of green tree frogs and insects in artificial canopy gaps in a bottomland hardwood forest. Am. Midl. Nat. 153:321-326. Abstract: We found more green tree frogs (Hyla cinerea) in canopy gaps than in closed canopy forest. Of the 331 green tree frogs observed, 88% were in canopy gaps. Likewise, higher numbers and biomasses of insects were captured in the open gap habitat. Flies were the most commonly collected insect group accounting for 54% of the total capture. These data suggest that one reason green tree frogs were more abundant in canopy gaps was the increased availability of prey and that small canopy gaps provide early successional habitats that are beneficial to green tree frog populations.
Date:
January 1, 2005
Creator:
Horn, Scott; Hanula, James L.; Ulyshen, Michael D. & Kilgo, John C.
Object Type:
Article
System:
The UNT Digital Library
Accelerated Stem Growth Rates and Improved Fiber Properties of Loblolly Pine: Functional Analysis Of CyclinD from Pinus taeda
A sustained supply of low-cost, high quality raw materials is essential for the future success of the U.S. forest products industry. To maximize stem (trunk) growth, a fundamental understanding of the molecular mechanisms that regulate cell divisions within the cambial meristem is essential. We hypothesize that auxin levels within the cambial meristem regulate cyclin gene expression and this in turn controls cell cycle progression as occurs in all eukaryotic cells. Work with model plant species has shown that ectopic overexpression of cyclins promotes cell division thereby increasing root growth > five times. We intended to test whether ectopic overexpression of cambial cyclins in the cambial zone of loblolly pine also promotes cell division rates that enhance stem growth rates. Results generated in model annual angiosperm systems cannot be reliably extrapolated to perennial gymnosperms, thus while the generation and development of transgenic pine is time consuming, this is the necessary approach for meaningful data. We succeeded in isolating a cyclin D gene and Clustal analysis to the Arabidopsis cyclin D gene family indicates that it is more closely related to cyclin D2 than D1 or D3 Using this gene as a probe we observed a small stimulation of cyclin D expression …
Date:
November 30, 2005
Creator:
Cairney, John; Peter, Gary; Egertsdotter, Ulrika & Wagner, Armin
Object Type:
Report
System:
The UNT Digital Library
Accelerated Testing of the CSNF Waste Form: Applicability to Yucca Mountain
Spent fuel tests in support of Yucca Mountain have been performed for many years. Most of these tests have been either single-pass flowthrough (SPFT) or unsaturated drip tests that have been used to elucidate waste form degradation rates. In general, the tests have been considered accelerated tests per the definition found in ASTM Standard C1174 in that either the temperature or flow rate has been increased in order to increase the rate of alteration. However, as the design and models for the proposed repository have solidified, it is clear that much of what was originally considered an accelerated test is, in reality, either a service condition test or a test that determines bounding conditions that grossly overestimate radionuclide degradation and release rates under repository relevant conditions. This presentation will examine the factors that need to be considered for future waste form, including waste package internals, degradation tests.
Date:
January 11, 2005
Creator:
Hanson, B.; Buck, E. & Brady, P.
Object Type:
Report
System:
The UNT Digital Library
Acceleration and deceleration phase nonlinear Rayleigh-Taylor growth at spherical interfaces
The Layzer model for the nonlinear evolution of bubbles in the Rayleigh-Taylor instability has recently been generalized to the case of spherically imploding interfaces [D. S. Clark and M. Tabak, to appear, PRE (2005).]. The spherical case is more relevant to, e.g., inertial confinement fusion or various astrophysical phenomena when the convergence is strong or the perturbation wavelength is comparable to the interface curvature. Here, the model is further extended to the case of bubble growth during the deceleration (stagnation) phase of a spherical implosion and to the growth of spikes during both the acceleration and deceleration phases. Differences in the nonlinear growth rates for both bubbles and spikes are found when compared with planar results. The model predictions are verified by comparison with numerical hydrodynamics simulations.
Date:
April 8, 2005
Creator:
Clark, D S & Tabak, M
Object Type:
Article
System:
The UNT Digital Library
Acceleration of calcite kinetics by abalone nacre proteins
The fascinating shapes and hierarchical designs of biomineralized structures have long been an inspiration to materials scientists because of the potential they suggest for biomolecular control over synthesis of crystalline materials. One prevailing view is that mineral-associated macromolecules are responsible for initiating and stabilizing non-equilibrium crystal polymorphs and morphologies through interactions between anionic moieties and cations in solution or at mineral surfaces. Indeed, numerous studies have demonstrated that bio-organic additives can dramatically alter crystal shapes and growth-rates in vitro. However, previous molecular-scale studies revealing mechanisms of growth modification focused on small molecules such as amino acids or peptides and always observed growth inhibition. In contrast, studies using full proteins were non-quantitative and underlying sources of growth modification were ill-defined. Here we investigate interactions between proteins isolated from abalone shell nacre and growing surfaces of calcite. We find that these proteins significantly accelerate the molecular-scale kinetics and, though much larger than atomic steps, alter growth morphology through step-specific interactions that lower their free energies. We propose that these proteins act as surfactants to promote ion attachment at calcite surfaces.
Date:
June 9, 2005
Creator:
Fu, G.; Qiu, S. R.; Orme, C. A.; Morse, D. E. & De Yoreo, J. J.
Object Type:
Article
System:
The UNT Digital Library
Acceleration of Field-Scale Bioreduction of U(VI) in a Shallow Alluvial Aquifer: Temporal and Spatial Evolution of Biogeochemistry
Uranium mill tailings sites provide access to uranium-contaminated groundwater at sites that are shallow and low hazard, making it possible to address the following scientific objectives: (1) Determine the dominant electron accepting processes at field sites with long-term metal/rad contamination; (2) Define the biogeochemical transformations that may be important to either natural or accelerated bioremediation under field conditions; and (3) Examine the potential for using biostimulation (electron donor addition) to accelerate reduction of U(VI) to U(IV) at the field scale.
Date:
April 20, 2005
Creator:
Long, Phil
Object Type:
Presentation
System:
The UNT Digital Library
Acceleration of Polarized Protons in the Ags With Two Helical Partial Snakes.
The RHIC spin program requires 2 x 10{sup 11} proton/bunch with 70% polarization. As the injector to RHIC, AGS is the bottleneck for preserving polarization: there is no space for a full snake to overcome numerous depolarizing resonances. An ac dipole and a partial snake have been used to preserve beam polarization in the past few years. Two helical snakes have been built and installed in the AGS. With careful setup of optics at injection and along the ramp, this combination can eliminate all depolarizing resonances encountered during acceleration. This paper presents the setup and preliminary results.
Date:
May 16, 2005
Creator:
Huang, H.; Ahrens, L.; Bai, M.; Brown, K.; Courant, E. D.; Gardner, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Accelerator and Ion Beam Tradeoffs for Studies of Warm Dense Matter
One approach for heating a target to ''Warm Dense Matter'' conditions (similar, for example, to the interiors of giant planets or certain stages in Inertial Confinement Fusion targets), is to use intense ion beams as the heating source (see refs.[6] and [7] and references therein for motivation and accelerator concepts). By consideration of ion beam phase space constraints, both at the injector, and at the final focus, and consideration of simple equations of state and relations for ion stopping, approximate conditions at a target foil may be calculated. Thus target temperature and pressure may be calculated as a function of ion mass, ion energy, pulse duration, velocity tilt, and other accelerator parameters. We connect some of these basic parameters to help search the extensive parameter space (including ion mass, ion energy, total charge in beam pulse, beam emittance, target thickness and density).
Date:
May 13, 2005
Creator:
Barnard, J. J.; Briggs, R. J.; Callahan, D. A.; Davidson, R. C.; Friedman, A.; Grisham, L. et al.
Object Type:
Article
System:
The UNT Digital Library
An Accelerator Control Middle Layer Using MATLAB
Matlab is an interpretive programming language originally developed for convenient use with the LINPACK and EISPACK libraries. Matlab is appealing for accelerator physics because it is matrix-oriented, provides an active workspace for system variables, powerful graphics capabilities, built-in math libraries, and platform independence. A number of accelerator software toolboxes have been written in Matlab -- the Accelerator Toolbox (AT) for model-based machine simulations, LOCO for on-line model calibration, and Matlab Channel Access (MCA) to connect with EPICS. The function of the MATLAB ''MiddleLayer'' is to provide a scripting language for machine simulations and on-line control, including non-EPICS based control systems. The MiddleLayer has simplified and streamlined development of high-level applications including configuration control, energy ramp, orbit correction, photon beam steering, ID compensation, beam-based alignment, tune correction and response matrix measurement. The database-driven Middle Layer software is largely machine-independent and easy to port. Six accelerators presently use the software package with more scheduled to come on line soon.
Date:
May 15, 2005
Creator:
Portmann, Gregory J.; Corbett, Jeff & Terebilo, Andrei
Object Type:
Article
System:
The UNT Digital Library
An Accelerator Control Middle Layer Using MATLAB
Matlab is a matrix manipulation language originally developed to be a convenient language for using the LINPACK and EISPACK libraries. What makes Matlab so appealing for accelerator physics is the combination of a matrix oriented programming language, an active workspace for system variables, powerful graphics capability, built-in math libraries, and platform independence. A number of software toolboxes for accelerators have been written in Matlab--the Accelerator Toolbox (AT) for machine simulations, LOCO for accelerator calibration, Matlab Channel Access Toolbox (MCA) for EPICS connections, and the Middle Layer. This paper will describe the ''middle layer'' software toolbox that resides between the high-level control applications and the low-level accelerator control system. This software was a collaborative effort between ALS (LBNL) and SPEAR3 (SSRL) but easily ports to other machines. Five accelerators presently use this software. The high-level Middle Layer functionality includes energy ramp, configuration control (save/restore), global orbit correction, local photon beam steering, insertion device compensation, beam-based alignment, tune correction, response matrix measurement, and script-based programs for machine physics studies.
Date:
March 15, 2005
Creator:
Portmann, Gregory J.; Corbett, Jeff & Terebilo, Andrei
Object Type:
Article
System:
The UNT Digital Library
An Accelerator Control Middle Layer Using Matlab
None
Date:
August 23, 2005
Creator:
Portmann, G.; /LBL, Berkeley; Corbett, J.; Terebilo, A. & /SLAC, SSRL /SLAC
Object Type:
Article
System:
The UNT Digital Library
Accelerator/Experiment Operations - FY 2005
None
Date:
October 1, 2005
Creator:
Casey, B.; Childress, S.; Conrad, J.; Evans, H.; Ginther, G.; Holmes, Stephen D. et al.
Object Type:
Report
System:
The UNT Digital Library
Accelerator Mass Spectrometric (AMS) Measurements of Plutonium Activity Concentrations and 240Pu/239Pu Atom Ratios In Soil Extracts Supplied by the Carlsbad Environmental Monitoring & Research Center
Plutonium-239 ({sup 239}Pu) and plutonium-239+240 ({sup 239+240}Pu) activities concentrations and {sup 240}Pu/{sup 239}Pu atom ratios are reported for a series of chemically purified soil extracts received from the Carlsbad Environmental Monitoring & Research Center (CEMRC) in New Mexico. Samples were analyzed without further purification at the Lawrence Livermore National Laboratory (LLNL) using accelerator mass spectrometry (AMS). This report also includes a brief description of the AMS system and internal laboratory procedures used to ensure the quality and reliability of the measurement data.
Date:
February 28, 2005
Creator:
Hamilton, T F; Brown, T A; Marchetti, A A; Martinelli, R E & Kehl, S R
Object Type:
Report
System:
The UNT Digital Library
Accelerator Mass Spectrometry Allows for Cellular Quantification of Doxorubicin at Femtomolar Concentrations
Accelerator mass spectrometry (AMS) is a highly sensitive analytical methodology used to quantify the content of radioisotopes, such as {sup 14}C, in a sample. The primary goals of this work were to demonstrate the utility of AMS in determining cellular [{sup 14}C]doxorubicin (DOX) concentrations and to develop a sensitive assay that is superior to high performance liquid chromatography (HPLC) for the quantification of DOX at the tumor level. In order to validate the superior sensitivity of AMS versus HPLC with fluorescence detection, we performed three studies comparing the cellular accumulation of DOX: one in vitro cell line study, and two in vivo xenograft mouse studies. Using AMS, we quantified cellular DOX content up to 4 hours following in vitro exposure at concentrations ranging from 0.2 pg/ml (345 fM) to 2 {micro}g/ml (3.45 {micro}M) [{sup 14}C]DOX. The results of this study show that, compared to standard fluorescence-based HPLC, the AMS method was over five orders of magnitude more sensitive. Two in vivo studies compared the sensitivity of AMS to HPLC using a nude mouse xenograft model in which breast cancer cells were implanted subcutaneously. After sufficiently large tumors formed, DOX was administered intravenously at two dose levels. Additionally, we tested the …
Date:
April 12, 2005
Creator:
DeGregorio, M W; Dingley, K H; Wurz, G T; Ubick, E & Turteltaub, K W
Object Type:
Article
System:
The UNT Digital Library
Accelerator mass spectrometry for quantitative in vivo tracing
Accelerator mass spectrometry (AMS) counts individual rare, usually radio-, isotopes such as radiocarbon at high efficiency and specificity in milligram-sized samples. AMS traces very low chemical doses ({micro}g) and radiative doses (100 Bq) of isotope labeled compounds in animal models and directly in humans for pharmaceutical, nutritional, or toxicological research. Absorption, metabolism, distribution, binding, and elimination are all quantifiable with high precision after appropriate sample definition.
Date:
April 19, 2005
Creator:
Vogel, J S
Object Type:
Article
System:
The UNT Digital Library
Accelerator mass spectrometry of actinides
None
Date:
June 9, 2005
Creator:
Marchetti, A. A.; Brown, T. A.; Cox, C. C.; Hamilton, T. F. & Martinelli, R. E.
Object Type:
Article
System:
The UNT Digital Library
Accelerator Structure Bead Pull Measurement at SLAC
Microwave measurement and tuning of accelerator structures are important issues for the current and next generation of high energy physics machines. Application of these measurements both before and after high power processing can reveal information about the structure but may be misinterpreted if measurement conditions are not carefully controlled. For this reason extensive studies to characterize the microwave measurements have been made at SLAC. For the bead pull a reproducible measurement of less than 1 degree of phase accuracy in total phase drift is needed in order to resolve issues such as phase changes due to structure damage during high power testing. Factors contributing to measurement errors include temperature drift, mechanical vibration, and limitations of measurement equipment such as the network analyzer. Results of this continuing effort will be presented.
Date:
May 13, 2005
Creator:
Lewandowski, J. R.; Bowden, G.; Miller, R. H. & Wang, J. W.
Object Type:
Article
System:
The UNT Digital Library