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Analysis of Devonian Black Shales in Kentucky for Potential Carbon Dioxide Sequestration and Enhanced Natural Gas Production Quarterly Report
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Application of Reservoir Characterization and Advanced Technology to Improve Recovery and Economics in a Lower Quality Shallow Shelf San Andres Reservoir Progress Report
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3,334 Matching Results
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Absence of Debye Sheaths Due to Secondary Electron Emission
A bounded plasma where the hot electrons impacting the walls produce more than one secondary on average is studied via particle-in-cell simulation. It is found that no classical Debye sheath or space-charge limited sheath exists. Ions are not drawn to the walls and electrons are not repelled. Hence the unconfined plasma electrons travel unobstructed to the walls, causing extreme particle and energy fluxes. Each wall has a positive charge, forming a small potential barrier or "inverse sheath" that pulls some secondaries back to the wall to maintain the zero current condition.
Date:
May 11, 2012
Creator:
Campanell, M. D.; Khabrov, A. & Kaganovich, I. D.
Object Type:
Report
System:
The UNT Digital Library
Absorber height effects on SWA restrictions and 'Shadow' LER
None
Date:
March 11, 2011
Creator:
McClinton, Brittany M.; Naulleau, Patrick P. & Wallow, Thomas
Object Type:
Article
System:
The UNT Digital Library
Absorption Spectra of Broadened Sodium Resonance Lines in Presence of Rare Gases
The pressure broadening of alkali-metal lines is a fundamental problem with numerous applications. For example, the sodium resonance lines broadened by xenon are important in the production of broad spectra emitted in the HPS (High-Pressure Sodium) lamp and they potentially can be used for gas condition diagnostics. Broadened absorption lines of alkali-metal atoms are prominent in the optical spectra of brown dwarfs and understanding the broadening mechanism will help elucidate the chemical composition and atmospheric properties of those stars. The far-line wing spectra of sodium resonance lines broadened by rare gases are found to exhibit molecular characteristics such as satellites and hence the total absorption coefficients for vapors of Na atoms and perturbing rare gas atoms can be modeled as Na-RG (rare gas) molecular absorption spectra. In this work, using carefully chosen interatomic potentials for Na-RG molecules we carry out quantum-mechanical calculations for reduced absorption coefficients for vapors composed of Na-He, Na-Ar, and Na-Xe. Calculated spectra are compared to available experimental results and the agreement is good in the measured satellite positions and shapes.
Date:
September 11, 2002
Creator:
Chung, H-K; Shurgalin, M & Babb, J F
Object Type:
Article
System:
The UNT Digital Library
Accelerated alpha radiation damage in a ceramic waste form, interim results
Interim results are presented on the alpha-decay damage study of a {sup 238}Pu-loaded ceramic waste form (CWF). The waste form was developed to immobilize fission products and transuranic species accumulated from the electrometallurgical treatment of spent nuclear fuel. To evaluate the effects of {alpha}-decay damage on the waste form the {sup 238}Pu-loaded material was analyzed by (1) x-ray diffraction (XRD), (2) microstructure characterization by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with energy and wavelength dispersive spectroscopy (EDS/WDS) and electron diffraction, (3) bulk density measurements and (4) waste form durability, performed by the product consistency test (PCT). While the predominate phase of plutonium in the CWF, PuO{sub 2}, shows the expected unit cell expansion due to {alpha}-decay damage, currently no significant change has occurred to the macro- or microstructure of the material. The major phase of the waste form is sodalite and contains very little Pu, although the exact amount is unknown. Interestingly, measurement of the sodalite phase unit cell is also showing very slight expansion; again, presumably from {alpha}-decay damage.
Date:
November 11, 1999
Creator:
Frank, S. M.; Johnson, S. G.; Moschetti, T. L.; O'Holleran, T. P.; Sinkler, W.; Esh, D. et al.
Object Type:
Article
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 of compact toruses and fusion applications
The Compact Torus (Spheromak-type) is a near ideal plasma confinement configuration for acceleration. The fields are mostly generated by internal plasma currents, plasma confinement is toroidal, and the compact torus exhibits resiliency and stability in virtue of the ``rugged`` helicity invariant. Based on these considerations we are developing a coaxial rail-gun type Compact Torus Accelerator (CTA). In the CTA, the CT ring is formed between coaxial electrodes using a magnetized Marshall gun, it is quasistatically ``precompressed`` in a conical electrode section for inductive energy storage, it is accelerated in a straight-coaxial electrode section as in a conventional rail-gun, and it is focused to small size and high energy and power density in a final ``focus`` cone section. The dynamics of slow precompression and acceleration have been demonstrated experimentally in the RACE device with results in good agreement with 2-D MHD code calculations. CT plasma rings with 100 {micro}gms mass have been accelerated to 40 Kj kinetic energy at 20% efficiency with final velocity = 1 X 10{sup 8} cm/s (= 5 KeV/H{sup +}). Preliminary focus tests exhibi dynamics of radius compression, deceleration, and bouncing. Compression ratios of 2-3 have been achieved. A scaled-up 10-100 MJ CTA is predicted to achieve …
Date:
October 11, 1990
Creator:
Hartman, C. W.; Eddleman, J. L.; Hammer, J. H.; Logan, B. G.; McLean, H. S. & Molvik, A. W.
Object Type:
Article
System:
The UNT Digital Library
An Acceleration Switching Valve Control System With Machine Tool Application
None
Date:
August 11, 1965
Creator:
MAnkin, J. B.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Accelerator Based Neutron Beams for Neutron Capture Therapy
The DOE-funded accelerator BNCT program at the Massachusetts Institute of Technology has resulted in the only operating accelerator-based epithermal neutron beam facility capable of generating significant dose rates in the world. With five separate beamlines and two different epithermal neutron beam assemblies installed, we are currently capable of treating patients with rheumatoid arthritis in less than 15 minutes (knee joints) or 4 minutes (finger joints) or irradiating patients with shallow brain tumors to a healthy tissue dose of 12.6 Gy in 3.6 hours. The accelerator, designed by Newton scientific Incorporated, is located in dedicated laboratory space that MIT renovated specifically for this project. The Laboratory for Accelerator Beam Applications consists of an accelerator room, a control room, a shielded radiation vault, and additional laboratory space nearby. In addition to the design, construction and characterization of the tandem electrostatic accelerator, this program also resulted in other significant accomplishments. Assemblies for generating epithermal neutron beams were designed, constructed and experimentally evaluated using mixed-field dosimetry techniques. Strategies for target construction and target cooling were implemented and tested. We demonstrated that the method of submerged jet impingement using water as the coolant is capable of handling power densities of up to 6 x 10(sup …
Date:
April 11, 2003
Creator:
Yanch, Jacquelyn C.
Object Type:
Report
System:
The UNT Digital Library
Accelerators for Intensity Frontier Research
In 2008, the Particle Physics Project Prioritization Panel identified three frontiers for research in high energy physics, the Energy Frontier, the Intensity Frontier, and the Cosmic Frontier. In this paper, I will describe how Fermilab is configuring and upgrading the accelerator complex, prior to the development of Project X, in support of the Intensity Frontier.
Date:
May 11, 2012
Creator:
Derwent, Paul
Object Type:
Article
System:
The UNT Digital Library
Acceptance test procedure for K basins dose reduction project clean and coat equipment
This document is the Acceptance Test Procedure (ATP) for the clean and coat equipment designed by Oceaneering Hanford, Inc. under purchase order MDK-XVC-406988 for use in the 105 K East Basin. The ATP provides the guidelines and criteria to test the equipment`s ability to clean and coat the concrete perimeter, divider walls, and dummy elevator pit above the existing water level. This equipment was designed and built in support of the Spent Nuclear Fuel, Dose Reduction Project. The ATP will be performed at the 305 test facility in the 300 Area at Hanford. The test results will be documented in WHC-SD-SNF-ATR-020.
Date:
March 11, 1996
Creator:
Creed, R.F.
Object Type:
Report
System:
The UNT Digital Library
Acceptance Test Procedure for New Pumping and Instrumentation Control Skid L
This Acceptance Test Procedure (ATP) provides for the inspection and testing of the new Pumping and Instrumentation Control (PIC) skid designed as ''L''. The ATP will be performed after the construction of the PIC skid in the shop.
Date:
October 11, 1999
Creator:
Koch, M. R.
Object Type:
Report
System:
The UNT Digital Library
Acceptance Test Procedure for New Pumping Instrumentation and Control Skid R
This Acceptance Test Procedure (ATP) provides for the inspection and testing of the new Pumping Instrumentation and Control (PIC) skid designed as ''R''. The ATP will be performed after the construction of the PIC skid in the fabrication shop.
Date:
May 11, 2000
Creator:
Koch, M. R.
Object Type:
Report
System:
The UNT Digital Library
Acceptance Test Report for AMS-4 Continuous Air Monitors (CAM) at 241AN Exhausters
This report provides the completed copy and test results of the Acceptance Test Procedure (TWR-4713). Test results were actually hand written in the ATP including redline changes. All acceptance criteria steps were completed satisfactorily without exceptions.
Date:
November 11, 1999
Creator:
SCAIEF, C.C.
Object Type:
Report
System:
The UNT Digital Library
Acceptance test report, inlet air filter and control station pressure decay leak test
This is the acceptance test report for pressure decay leak tests performed on Tank Farm primary ventilation system inlet air filter and control stations, following their installation in the field and prior to acceptance for beneficial use.
Date:
February 11, 1997
Creator:
Tuck, J.A., Fluor Daniel Hanford
Object Type:
Report
System:
The UNT Digital Library
Accounting of test specimens for the long-term corrosion testing
The purpose of this TIP is to describe the procedures that will be employed for identification and con-trol of test specimens for Activity E-20-50, �Long-Term Corrosion Studies�. This TIP was written tocomply with LLNL YMP procedure 033-YMP-QP 8.0, �Identification and Control of Items, Samples,and Data.�
Date:
October 11, 1995
Creator:
Gdowski, G.
Object Type:
Report
System:
The UNT Digital Library
Accurate Method for Forward and Reverse Bias Curve Fitting of TPV I-V Data
None
Date:
May 11, 2006
Creator:
Danielson, L. & Depoy, D.
Object Type:
Report
System:
The UNT Digital Library
Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects
This report summarizes the work done during the second quarter of the project. Effort is directed in two areas: (1) The use of a novel method to achieve a given porosity level with high contiguity and thus conductivity. (2) Relate the measured conductivity to porosity and contiguity. The rationale for these experiments was to develop cathodes with high ionic conductivity, so that the effective polarization resistance will be concomitantly lowered.
Date:
October 11, 2003
Creator:
Virkar, Anil V.
Object Type:
Report
System:
The UNT Digital Library
Active Desiccant-Based Preconditioning Market Analysis and Product Development
The Phase 1 report (ORNL/Sub/94-SVO44/1), completed earlier in this program, involved a comprehensive field survey and market analysis comparing various specialized outdoor air handling units. This initial investigation included conventional cooling and reheat, conventional cooling with sensible recovery, total energy recovery systems (passive desiccant technology) and various active desiccant systems. The report concluded that several markets do promise a significant sales opportunity for a Climate Changer-based active desiccant system offering. (Climate Changer is a registered trademark of Trane Company.) This initial market analysis defined the wants and needs of the end customers (design engineers and building owners), which, along with subsequent information included in this report, have been used to guide the determination of the most promising active desiccant system configurations. This Phase 2 report begins with a summary of a more thorough investigation of those specific markets identified as most promising for active desiccant systems. Table 1 estimates the annual sales potential for a cost-effective product line of active desiccant systems, such as that built from Climate Changer modules. The Product Development Strategy section describes the active desiccant system configurations chosen to best fit the needs of the marketplace while minimizing system options. Key design objectives based on market …
Date:
January 11, 2001
Creator:
Fischer, J.
Object Type:
Report
System:
The UNT Digital Library
An Active Region Model for Capturing Fractal Flow Patterns inUnsaturated Soils: Model Development
Preferential flow commonly observed in unsaturated soils allows rapid movement of solute from the soil surface or vadose zone to the groundwater, bypassing a significant volume of unsaturated soil and increasing the risk of groundwater contamination. A variety of evidence indicates that complex preferential patterns observed from fields are fractals. In this study, we developed a relatively simple active region model to incorporate the fractal flow pattern into the continuum approach. In the model, the flow domain is divided into active and inactive regions. Flow occurs preferentially in the active region (characterized by fractals), and inactive region is simply bypassed. A new constitutive relationship (the portion of the active region as a function of saturation) was derived. The validity of the proposed model is demonstrated by the consistency between field observations and the new constitutive relationship.
Date:
June 11, 2005
Creator:
Liu, Hui-Hai; Zhang, R. & Bodvarsson, Gudmundur S.
Object Type:
Article
System:
The UNT Digital Library
An Active Region Model for Capturing Fractal Flow Patterns inUnsaturated Soils: Model Development
This report describes the development of a simple active region model to incorporate the fractal flow pattern into the continuum approach.
Date:
June 11, 2005
Creator:
Liu, Hui-Hai; Zhang, R. & Bodvarsson, Gudmundur S.
Object Type:
Article
System:
The UNT Digital Library
Active voltammetric microsensors with neural signal processing.
Many industrial and environmental processes, including bioremediation, would benefit from the feedback and control information provided by a local multi-analyte chemical sensor. For most processes, such a sensor would need to be rugged enough to be placed in situ for long-term remote monitoring, and inexpensive enough to be fielded in useful numbers. The multi-analyte capability is difficult to obtain from common passive sensors, but can be provided by an active device that produces a spectrum-type response. Such new active gas microsensor technology has been developed at Argonne National Laboratory. The technology couples an electrocatalytic ceramic-metallic (cermet) microsensor with a voltammetric measurement technique and advanced neural signal processing. It has been demonstrated to be flexible, rugged, and very economical to produce and deploy. Both narrow interest detectors and wide spectrum instruments have been developed around this technology. Much of this technology's strength lies in the active measurement technique employed. The technique involves applying voltammetry to a miniature electrocatalytic cell to produce unique chemical ''signatures'' from the analytes. These signatures are processed with neural pattern recognition algorithms to identify and quantify the components in the analyte. The neural signal processing allows for innovative sampling and analysis strategies to be employed with the …
Date:
December 11, 1998
Creator:
Vogt, M. C.
Object Type:
Article
System:
The UNT Digital Library
Activity of fission products
This report compares the activity and disintegration energy of fission products from metal under two conditions of exposure: 200 Megawatt-days integrated exposure over a period of 180 days, and 400 Megawatt-days integrated exposure over a period of 360 days. (JL)
Date:
November 11, 1948
Creator:
Garbrecht, M. & Gillette, P. R.
Object Type:
Report
System:
The UNT Digital Library
An Adaptive B-Spline Method for Low-order Image Reconstruction Problems - Final Report - 09/24/1997 - 09/24/2000
A common problem in signal processing is to estimate the structure of an object from noisy measurements linearly related to the desired image. These problems are broadly known as inverse problems. A key feature which complicates the solution to such problems is their ill-posedness. That is, small perturbations in the data arising e.g. from noise can and do lead to severe, non-physical artifacts in the recovered image. The process of stabilizing these problems is known as regularization of which Tikhonov regularization is one of the most common. While this approach leads to a simple linear least squares problem to solve for generating the reconstruction, it has the unfortunate side effect of producing smooth images thereby obscuring important features such as edges. Therefore, over the past decade there has been much work in the development of edge-preserving regularizers. This technique leads to image estimates in which the important features are retained, but computationally the y require the solution of a nonlinear least squares problem, a daunting task in many practical multi-dimensional applications. In this thesis we explore low-order models for reducing the complexity of the re-construction process. Specifically, B-Splines are used to approximate the object. If a ''proper'' collection B-Splines are …
Date:
April 11, 2000
Creator:
Li, Xin; Miller, Eric L.; Rappaport, Carey & Silevich, Michael
Object Type:
Report
System:
The UNT Digital Library
An adaptive optics package designed for astronomical use with a laser guide star tuned to an absorption line of atomic sodium
We present the design and implementation of a very compact adaptive optic system that senses the return light from a sodium guide-star and controls a deformable mirror and a pointing mirror to compensate atmospheric perturbations in the wavefront. The deformable mirror has 19 electrostrictive actuators and triangular subapertures. The wavefront sensor is a Hartmann sensor with lenslets on triangular centers. The high-bandwidth steering mirror assembly incorporates an analog controller that samples the tilt with an avalanche photodiode quad cell. An {line_integral}/25 imaging leg focuses the light into a science camera that can either obtain long-exposure images or speckle data. In laboratory tests overall Strehl ratios were improved by a factor of 3 when a mylar sheet was used as an aberrator. The crossover frequency at unity gain is 30 Hz.
Date:
April 11, 1994
Creator:
Salmon, J. T.; Avicola, K. & Brase, J. M.
Object Type:
Article
System:
The UNT Digital Library