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652 Matching Results
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Carbon and hydrogen isotope signatures associated with microbial iron reduction
None
Date:
January 9, 2001
Creator:
Horita, J.
Object Type:
Article
System:
The UNT Digital Library
Chemical aspects of actinides in the geosphere: towards a rational nuclear materials management
A complete understanding of actinide interactions in the geosphere is paramount for developing a rational Nuclear and Environmental Materials Management Policy. One of the key challenges towards understanding the fate and transport of actinides is determining their speciation (i.e., oxidation state and structure). Since an element's speciation directly dictates physical properties such as toxicity and solubility, this information is critical for evaluating and controlling the evolution of an actinide element through the environment. Specific areas within nuclear and environmental management programs where speciation is important are (1) waste processing and separations; (2) wasteform materials for long-term disposition; and (3) aqueous geochemistry. The goal of this project was to develop Actinide X-ray Absorption Spectroscopy ( U S ) as a core capability at LLNL and integrate it with existing facilities, providing a multi-technique approach to actinide speciation. XAS is an element-specific structural probe which determines the oxidation state and structure for most atoms. XAS can be more incisive than other spectroscopies because it originates from an atomic process and the information is always attainable, regardless of an element's speciation. Despite the utility, XAS is relatively complex due to the need for synchrotron radiation and significant expertise with data acquisition and analysis. …
Date:
February 9, 2001
Creator:
Allen, P & Sylwester, E
Object Type:
Report
System:
The UNT Digital Library
Chemical Inhomogeneities and Pulsation
Major improvements in models of chemically peculiar stars have been achieved in the past few years. With these new models it has been possible to test quantitatively some of the processes involved in the formation of abundance anomalies and their effect on stellar structure. The models of metallic A (Am) stars have shown that a much deeper mixing has to be present to account for observed abundance anomalies. This has implications on their variability, which these models also reproduce qualitatively. These models also have implications for other chemically inhomogeneous stars such as HgMn B stars which are not known to be variable and {lambda} Booetis stars which can be. The study of the variability of chemically inhomogeneous stars can provide unique information on the dynamic processes occurring in many types of stars in addition to modeling of the evolution of their surface composition.
Date:
October 9, 2001
Creator:
Turcotte, S
Object Type:
Article
System:
The UNT Digital Library
Chemicals--Industry of the Future; Industrial Partnerships: Advancing Energy and Environmental Goals
This tri-fold brochure describe the partnering activities of the Office of Industrial Technologies' (OIT) Industries of the Future (IOF) for Chemicals. Information on what works for the Chemicals industry, examples of successful partnerships, and benefits of partnering with OIT are included.
Date:
February 9, 2001
Creator:
DOE Office of Industrial Technologies
Object Type:
Book
System:
The UNT Digital Library
Cherokeean/Herald (Rusk, Tex.), Vol. 152, No. 25, Ed. 1 Thursday, August 9, 2001
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
August 9, 2001
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 106, No. 12, Ed. 1 Friday, February 9, 2001
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
February 9, 2001
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 106, No. 20, Ed. 1 Friday, March 9, 2001
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 9, 2001
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 106, No. 37, Ed. 1 Wednesday, May 9, 2001
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 9, 2001
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 106, No. 90, Ed. 1 Friday, November 9, 2001
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
November 9, 2001
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
[Clipping: Democrats envision renewed dominance]
Clipping of an article about the 2002 election and officials roasting GOP at gathering of party leaders.
Date:
September 9, 2001
Creator:
unknown
Object Type:
Clipping
System:
The UNT Digital Library
CO2 Selective Ceramic Membrane for Water-Gas Shift Reaction With Concomitant for the Recovery of CO2
None
Date:
April 9, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
CO2 SELECTIVE CERAMIC MEMBRANE FOR WATER-GAS SHIFT REACTION WITH CONCOMITANT FOR THE RECOVERY OF CO2
None
Date:
April 9, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 20, No. 26, Ed. 1 Thursday, August 9, 2001
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
August 9, 2001
Creator:
Beesley, Tom
Object Type:
Newspaper
System:
The Portal to Texas History
Comanche Chief (Comanche, Tex.), No. 14, Ed. 1 Thursday, August 9, 2001
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
August 9, 2001
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
Combating Terrorism: Comments on H.R. 525 to Create a President's Council on Domestic Terrorism Preparedness
Testimony issued by the General Accounting Office with an abstract that begins "This testimony discusses the Preparedness Against Domestic Terrorism Act of 2001 (H.R. 525). To improve federal efforts to help state and local personnel prepare for domestic terrorist attacks, H.R. 525 would create a single focal point for policy and coordination--the President's Council on Domestic Terrorism Preparedness--within the White House. The new council would include the President, several cabinet secretaries, and other selected high-level officials. H.R. 525 would (1) create an executive director position with a staff that would collaborate with other executive agencies to assess threats, (2) require the new council to develop a national strategy, (3) require the new council to analyze and review budgets, and (4) require the new council to oversee implementation among the different federal agencies. Other proposals before Congress would also create a single focal point for terrorism. Some of these proposals place the focal point in the Executive Office of the President and others place it in a lead executive agency. Both locations have advantages and disadvantages."
Date:
May 9, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
A compact 64-pixel CsI(T1)/Si PIN photodiode imaging module with IC readout
We characterize the performance of a complete 64-pixel compact gamma camera imaging module consisting of optically isolated 3 mm 3 mm 5 mm CsI(Tl) crystals coupled to a custom array of low-noise Si PIN photodiodes read out by a custom IC. At 50 V bias the custom 64-pixel photodiode arrays demonstrate an average leakage current of 28 pA per 3 mm 3 mm pixel, a 98.5 percent yield of pixels with <100 pA leakage, and a quantum efficiency of about 80 percent for 540 nm CsI(Tl) scintillation photons. The custom 64-channel readout IC uses low-noise preamplifiers, shaper amplifiers, and a winner-take-all (WTA) multiplexer. The IC demonstrates maximum gain of 120 mV / 1000 e-, the ability to select the largest input signal in less than 150 ns, and low electronic noise at 8 ms peaking time ranging from 25 e- rms (unloaded) to an estimated 180 e- rms (photodiode load of 3 pF, 50 pA). At room temperature a complete 64-pixel detector module employing a custom photodiode array and readout IC demonstrates an average energy resolution of 23.4 percent fwhm and an intrinsic spatial resolution of 3.3 mm fwhm for the 140 keV emissions of 99mTc. Construction of an array …
Date:
August 9, 2001
Creator:
Gruber, Gregory J.; Choong, Woon-Seng; Moses, William W.; Derenzo, Stephen E.; Holland, Stephen E.; Pedrali-Noy, Marzio et al.
Object Type:
Article
System:
The UNT Digital Library
Comparison of Fracture Methodologies for Flaw Stability Analysis for High Level Waste Storage Tanks
The analysis to determine flaw stability requires inputs of material properties and stress conditions to a fracture mechanics methodology. Activities in the Life Management Program for the Type I and II high level waste tanks cover the development of these inputs at tank-specific conditions. This report provides a comprehensive review of fracture mechanics methods that are appropriate for the Type I and II tanks.
Date:
March 9, 2001
Creator:
Lam, P. S.
Object Type:
Report
System:
The UNT Digital Library
Comparison of the PSHA results of the 1993-EUS- update and the 1998-TIP studies for waste bar
From 1981 to 1989, Lawrence Livermore National Laboratory (LLNL) developed for the Nuclear Regulatory Commission a method for performing Probabilistic Seismic Hazard Analysis (PSHA) in the eastern US with results documented in NUREG/CR-5250. Improvements in the handling of the uncertainties lead to updated results documented in the 1993-EUS-Update study (NUREG-1488.) These results presented substantial differences with the utilities sponsored study performed by the Electric Power Research Institute (EPRI, 1989.) In order to understand the differences between the two studies, the Nuclear Regulatory Commission (NRC), the Department Of Energy (DOE) and EPRI jointly sponsored a study led by the Senior Seismic Hazard Analysis Committee (SSHAC) the task of which was to explain the differences between the two studies and provide guidance on how to perform a state-of-the-art PSHA. The work and conclusions of the SSHAC are documented in NUREG/CR-6372, 1997. As a follow-up to the 1997 SSHAC study, the Trial Implementation Project (TIP), (UCRL-ID-133494, 1998, NUREG/CR-6607) made use of the SSHAC recommendations and developed a set of more detailed guidance for performing PSHA. The TIP project tested the more complicated issue of development of the seismic zonation and seismicity models on two sites: Watts Bar and Vogtle. It was found that …
Date:
January 9, 2001
Creator:
Savy, J & Bernreuter, D
Object Type:
Report
System:
The UNT Digital Library
Composition-structure-property-performance relationship inMn-substituted LiMn2O4
The spinel LiMn{sub 2}O{sub 4} has been extensively studied as a positive electrode active material in lithium rechargeable batteries. Partial substitution of Mn by another metal has also been the subject of recent study in an effort to improve the cycling performance. In general, the literature has shown that Mn substitution results in improved cycling stability at the expense of capacity (1,2). Resistance to the formation of tetragonal phase upon lithiation of the starting spinel (via a higher nominal Mn oxidation state in the substituted spinel) has been suggested as a mechanism for the improved performance. The degree of substitution is an important factor to optimize in order to minimize capacity loss and costs. The spectroscopic investigations on LiMn{sub 2}O{sub 4} described in the previous paper (LixMn2O4) confirmed that the cooperative Jahn-Teller effect (CJTE) from the [Mn{sup 3+}O{sub 6}] octahedra is the mechanism for the cubic to tetragonal phase transformation. The driving force for the CJTE is based upon the electronic structure, therefore changes in electronic structure should lead to changes in the phase behavior. The fact that the LiMn{sub 1.5}Ni{sub 0.5}O{sub 4} does not form tetragonal phase upon discharging (FUJI3, MUCK?), unlike the 100% Mn{sup 4+} spinel Li{sub 4}Mn{sub …
Date:
March 9, 2001
Creator:
Horne, Craig R.; Richardson, Thomas J.; Gee, B.; Tucker, Mike; Grush, Melissa M.; Bergmann, Uwe et al.
Object Type:
Article
System:
The UNT Digital Library
Comprehensive mitigation assessment process (COMAP) - Description and instruction manual
In order to prepare policies and plans to reduce GHG emissions, national policy-makers need information on the costs and benefits of different mitigation options in addition to their carbon implications. Policy-makers must weigh the costs, benefits, and impacts of climate change mitigation and adaptation options, in the face of competition for limited resources. The policy goal for mitigation options in the land use sector is to identify which mix of options is likely to best achieve the desired forestry service and production objectives at the least cost, while attempting to maximize economic and social benefits, and minimize negative environmental and social impacts. Improved national-level cost estimates of response options in the land use sector can be generated by estimating the costs and benefits of different forest management practices appropriate for specific country conditions which can be undertaken within the constraint of land availability and its opportunity cost. These co st and land use estimates can be combined to develop cost curves, which would assist policy-makers in constructing policies and programs to implement forest responses.
Date:
November 9, 2001
Creator:
Makundi, Willy & Sathaye, Jayant
Object Type:
Report
System:
The UNT Digital Library
Compressional and Shear Wave Velocities for Artificial Granular Media Under Simulated Near Surface Conditions
Laboratory ultrasonic experiments were made on artificial soil samples in order to observe the effects of slight overburden, sand/clay ratio and pore fluid saturation on compressional and shear wave velocities. Up to several meters of overburden were simulated by applying low uniaxial stress of about 0.1 MPa to a restrained sample. Samples were fabricated from Ottawa sand mixed with a swelling clay (Wyoming bentonite). The amount of clay added was 1 to 40 percent by mass. Most measurements were made under room-dry conditions, but some measurements were made for fully-saturated sand-clay mixtures and for partially-saturated sand samples. For the dry sand-clay samples, compressional (P) velocities were low, ranging from about 200 to 500 m/s for the mixtures at low stress. Shear (S) velocities were about half of the compressional velocity, about 70 to 250 m/s. Dramatic increases in all velocities occurred with small uniaxial loads, indicating strong nonlinearity. Composition and grain packing control the mechanical response at grain contacts and the resulting nonlinear response at low stresses. P and S velocities are sensitive to the amount of clay added, even at low concentrations. At these low equivalent overburden conditions, adhesion and capillarity at grain contacts affect wave amplitudes, velocities, and …
Date:
September 9, 2001
Creator:
Bonner, B. P.; Berge, P. A. & Wildenschild, D.
Object Type:
Article
System:
The UNT Digital Library
Computer Modeling of Saltstone Landfills by Intera Environmental Consultants
This report summaries the computer modeling studies and how the results of these studies were used to estimate contaminant releases to the groundwater. These modeling studies were used to improve saltstone landfill designs and are the basis for the current reference design. With the reference landfill design, EPA Drinking Water Standards can be met for all chemicals and radionuclides contained in Savannah River Plant waste salts.
Date:
August 9, 2001
Creator:
Albenesius, E.L.
Object Type:
Report
System:
The UNT Digital Library
Computer Security: Improvements Needed to Reduce Risk to Critical Federal Operations and Assets
Testimony issued by the General Accounting Office with an abstract that begins "Federal agencies rely extensively on computer systems and electronic data to support their missions. The security of these systems is essential to avoiding disruptions in critical operations and to prevent data tampering, fraud, and inappropriate disclosure of sensitive information. GAO analyzed information security audits and evaluations at 24 major federal departments and agencies since July 2000. This testimony summarizes (1) the pervasive weaknesses that led GAO to begin reporting information security as a government-wide high-risk issue in 1997, (2) the serious risks that these weaknesses pose at selected agencies and common weaknesses that agencies need to address to improve their information security programs, and (3) the importance of establishing strong agency-wide security management programs and developing a comprehensive government-wide strategy for improvement."
Date:
November 9, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Consequences of return to power after a beam interruption in the blanket of an accelerator driven system.
A sudden drop in power after a beam interruption leads to thermal fatigue effects in structural components in the blanket of an accelerator driven system. These thermal fatigue effects limit component lifetimes. A sudden return to power after a beam interruption can contribute significant additional thermal fatigue and greatly reduce component lifetimes. One obvious solution is a gradual return to power after a beam interruption. There are two potential problems with this solution. One problem involves interruptions that are longer than the thermal time constants of thin structural members but shorter than the time constants of thick structural members. In such a case, a gradual return to power reduces the additional thermal fatigue in the thin structural members but increases the thermal fatigue in thick structural members. Some compromise is necessary. The other problem is that for thick components with long thermal time constants a long, gradual return to power is required to minimize additional thermal fatigue. Such a slow return to power can reduce the utilization or the effective load factor of the system. Specific examples of beam interruptions with various assumptions on return to power are provided for a preliminary design for the blanket of the Accelerator Driven …
Date:
August 9, 2001
Creator:
Dunn, F.
Object Type:
Article
System:
The UNT Digital Library