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647 Matching Results
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DiMES Studies of Temperature Dependence of Carbon Erosion and Re-Deposition in the DIII-D Divertor
A strong effect of a moderately elevated surface temperature on net carbon deposition and deuterium co-deposition in the DIII-D divertor was observed under detached conditions. A DiMES sample with a gap 2 mm wide and 18 mm deep was exposed to lower-single-null (LSN) L-mode plasmas first at room temperature, and then at 200 C. At the elevated temperature, deuterium co-deposition in the gap was reduced by an order of magnitude. At the plasma-facing surface of the heated sample net carbon erosion was measured at a rate of 3 nm/s, whereas without heating net deposition is normally observed under detachment. In a related experiment three sets of molybdenum mirrors recessed 2 cm below the divertor floor were exposed to identical LSN ELMy H-mode discharges. The first set of mirrors exposed at ambient temperature exhibited net carbon deposition at a rate of up to 3.7 nm/s and suffered a significant drop in reflectivity. In contrast, two other mirror sets exposed at elevated temperatures between 90 C and 175 C exhibited practically no carbon deposition.
Date:
March 15, 2007
Creator:
Rudakov, D. L.; Jacob, W.; Krieger, K.; Litnovsky, A.; Philipps, V.; West, W. P. et al.
Object Type:
Article
System:
The UNT Digital Library
Limitations on High Data Rate Optical Fiber Transmission Systems Due to Transmission Impairment
This project supplemented our regular DOE grant from the Basic Energy Sciences organization with the goal of fostering industrial partnerships and student internships. During the project period, we have interacted with between 15 and 20 companies in the optical fiber telecommunications equipment industry, and our students have participated in a number of highly visible projects with companies such as Ciena, Science Applications International Corporation, KDD, ATT, Virtual Photonics, Inc., Phaethon Telecommunications, PhotonEx, and others. The project led to many successful interactions and numerous job offers for our students.
Date:
March 15, 2002
Creator:
Menyuk, Curtis R.
Object Type:
Report
System:
The UNT Digital Library
Deformation behavior of ion-irradiated polyimide
None
Date:
March 15, 2004
Creator:
Kucheyev, S O; Felter, T E; Anthamatten, M & Bradby, J E
Object Type:
Article
System:
The UNT Digital Library
Exact Averaging of Stochastic Equations for Flow in Porous Media
It is well known that at present, exact averaging of the equations for flow and transport in random porous media have been proposed for limited special fields. Moreover, approximate averaging methods--for example, the convergence behavior and the accuracy of truncated perturbation series--are not well studied, and in addition, calculation of high-order perturbations is very complicated. These problems have for a long time stimulated attempts to find the answer to the question: Are there in existence some, exact, and sufficiently general forms of averaged equations? Here, we present an approach for finding the general exactly averaged system of basic equations for steady flow with sources in unbounded stochastically homogeneous fields. We do this by using (1) the existence and some general properties of Green's functions for the appropriate stochastic problem, and (2) some information about the random field of conductivity. This approach enables us to find the form of the averaged equations without directly solving the stochastic equations or using the usual assumption regarding any small parameters. In the common case of a stochastically homogeneous conductivity field we present the exactly averaged new basic nonlocal equation with a unique kernel-vector. We show that in the case of some type of global …
Date:
March 15, 2008
Creator:
Karasaki, Kenzi; Shvidler, Mark & Karasaki, Kenzi
Object Type:
Article
System:
The UNT Digital Library
Uncertainty in the reactive transport model response to analkaline perturbation in a clay formation
The mineral alteration in the concrete barrier and in the clay formation around long-lived intermediate-level radioactive waste in the French deep geological disposal concept is evaluated using numerical modeling. There are concerns that the mineralogical composition of the surrounded clay will not be stable under the high alkaline pore fluid conditions caused by concrete (pH {approx} 12). Conversely, the infiltration of CO{sub 2}-rich groundwater from the clay formation into initially unsaturated concrete, at the high temperature (T {approx} 70 C) produced from the decay of radionuclides, could cause carbonation, thereby potentially affecting critical performance functions of this barrier. This could also lead to significant changes in porosity, which would affect aqueous diffusive transport of long-lived radionuclides. All these processes are therefore intimately coupled and advanced reactive transport models are required for long-term performance assessment. The uncertainty in predictions of these models is one major question that must be answered. A mass-transfer model response to an alkaline perturbation in clay with standard model values is first simulated using the two-phase non-isothermal reactive transport code TOUGHREACT. The selection of input parameters is thereafter designed to sample uncertainties in a wide range of physico-chemical processes without making a priori assumptions about the relative …
Date:
March 15, 2006
Creator:
Burnol, A.; Blanc, P.; Xu, T.; Spycher, N. & Gaucher, E. C.
Object Type:
Article
System:
The UNT Digital Library
Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides: 2. Field Research on Bioremediation of Metals and Radionuclides
Bioremediation of metals and radionuclides has had manyfield tests, demonstrations, and full-scale implementations in recentyears. Field research in this area has occurred for many different metalsand radionuclides using a wide array of strategies. These strategies canbe generally characterized in six major categories: biotransformation,bioaccumulation/bisorption, biodegradation of chelators, volatilization,treatment trains, and natural attenuation. For all field applicationsthere are a number of critical biogeochemical issues that most beaddressed for the successful field application. Monitoring andcharacterization parameters that are enabling to bioremediation of metalsand radionuclides are presented here. For each of the strategies a casestudy is presented to demonstrate a field application that uses thisstrategy.
Date:
March 15, 2007
Creator:
Hazen, Terry C. & Tabak, Henry H.
Object Type:
Article
System:
The UNT Digital Library
Formulations for the "Characterization of unique compounds in explosives" project
None
Date:
March 15, 2006
Creator:
Alcaraz, A. & Dougan, A.
Object Type:
Report
System:
The UNT Digital Library
Physics of arcing, and implications to sputter deposition
Arc and glow discharges are defined based on their cathode processes. Arcs are characterized by collective electron emission, which can be stationary with hot cathodes (thermionic arcs), or non-stationary with cold cathodes (cathodic arcs). A brief review on cathodic arc properties serves as the starting point to better understand arcing phenomena in sputtering. Although arcing occurs in both metal and reactive sputtering, it is more of an issue in the reactive case. Arcing occurs if sufficiently high field strength leads to thermal runaway of an electron emission site. The role of insulating layers and surface potential adjustment through current leakage is highlighted. In the situation of magnetron sputtering with ''racetrack'', the need for a model with two spatial dimensions is shown. In many cases, arcing is initiated by breakdown of dielectric layers and inclusions. It is most efficiently prevented if formation and excessive charge-up of dielectric layers and inclusions can be avoided.
Date:
March 15, 2005
Creator:
Anders, Andre
Object Type:
Article
System:
The UNT Digital Library
Implementation of nodal equivalence parameters in DIF3D-VARIANT for core analysis of prismatic Very High Temperature Reactor (VHTR).
The VARIANT module of the DIF3D code has been upgraded to utilize surface-dependent discontinuity factors. The performance of the new capability is verified using two-dimensional core cases with control rods in reflector and fuel blocks. Cross sections for VHTR components were generated using the DRAGON and HELIOS codes. For rodded block cross sections, the DRAGON calculations used a single-block model or the multi-block models combined with MCNP4C flux solutions, whereas the HELIOS calculations utilized multi-block models. Results from core calculations indicate that multiplication factor, block power, and control rod worth are significantly improved by using surface-dependent discontinuity factors.
Date:
March 15, 2007
Creator:
Lee, C. H.; Joo, H. K.; Yang, W. S. & Taiwo, T. A.
Object Type:
Report
System:
The UNT Digital Library
Comparisons Between Experimental Measurments and Numerical Simulations of Spheromak Formation in SSPX
Data from a recently installed insertable magnetic probe array in the Sustained Spheromak Physics Experiment (SSPX) [E. B. Hooper et al., Nucl. Fusion 39, 863 (1999)] is compared against NIMROD [C. R. Sovinec et al., J. Comp. Phys. 195, 355 (2004)], a full 3D resistive magnetohydrodynamic code that is used to simulate SSPX plasmas. The experiment probe consists of a linear array of chip inductors arranged in clusters that are spaced every 2 cm, and spans the entire machine radius at the flux conserver midplane. Both the experiment and the numerical simulations show the appearance, shortly after breakdown, of a column with a hollow current profile that precedes magnetic reconnection, a process essential to the formation of closed magnetic flux surfaces. However, there are differences between the experiment and the simulation in how the column evolves after it is formed. These differences are studied to help identify the mechanisms that eventually lead to closed-flux surfaces (azimuthally averaged) and flux amplification, which occur in both the experiment and the simulation.
Date:
March 15, 2006
Creator:
Romero-Talam?s, C. A.; Hooper, E. B.; Hill, D. N.; Cohen, B. I.; McLean, H. S.; Wood, R. D. et al.
Object Type:
Article
System:
The UNT Digital Library
CH-TRU Waste Content Codes (CH-TRUCON)
The CH-TRU Waste Content Codes (CH-TRUCON) document describes the inventory of the U.S. Department of Energy (DOE) CH-TRU waste within the transportation parameters specified by the Contact-Handled Transuranic Waste Authorized Methods for Payload Control (CH-TRAMPAC). The CH-TRAMPAC defines the allowable payload for the Transuranic Package Transporter-II (TRUPACT-II) and HalfPACT packagings. This document is a catalog of TRUPACT-II and HalfPACT authorized contents and a description of the methods utilized to demonstrate compliance with the CH-TRAMPAC. A summary of currently approved content codes by site is presented in Table 1. The CH-TRAMPAC describes "shipping categories" that are assigned to each payload container. Multiple shipping categories may be assigned to a single content code. A summary of approved content codes and corresponding shipping categories is provided in Table 2, which consists of Tables 2A, 2B, and 2C. Table 2A provides a summary of approved content codes and corresponding shipping categories for the "General Case," which reflects the assumption of a 60-day shipping period as described in the CH-TRAMPAC and Appendix 3.4 of the CH-TRU Payload Appendices. For shipments to be completed within an approximately 1,000-mile radius, a shorter shipping period of 20 days is applicable as described in the CH-TRAMPAC and Appendix 3.5 …
Date:
March 15, 2005
Creator:
Westinghouse TRU Solutions LLC
Object Type:
Report
System:
The UNT Digital Library
Porous ceramic scaffolds with complex architectures
This work compares two novel techniques for the fabrication of ceramic scaffolds for bone tissue engineering with complex porosity: robocasting and freeze casting. Both techniques are based on the preparation of concentrated ceramic suspensions with suitable properties for the process. In robocasting, the computer-guided deposition of the suspensions is used to build porous materials with designed three dimensional (3-D) geometries and microstructures. Freeze casting uses ice crystals as a template to form porous lamellar ceramic materials. Preliminary results on the compressive strengths of the materials are also reported.
Date:
March 15, 2008
Creator:
Saiz, Eduardo; Munch, Etienne; Franco, Jaime; Deville, Sylvain; Hunger, Phillip; Saiz, Eduardo et al.
Object Type:
Article
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 36, No. 62, Ed. 1 Tuesday, March 15, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
March 15, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 68, Ed. 1 Thursday, March 15, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
March 15, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 69, Ed. 1 Thursday, March 15, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
March 15, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Today Cedar Hill (Duncanville, Tex.), Vol. 35, No. 51, Ed. 1 Thursday, March 15, 2001
Weekly newspaper published in Duncanville, Texas that includes local Cedar Hill, state, and national news along with advertising.
Date:
March 15, 2001
Creator:
Crooks, Kristi
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 37, No. 66, Ed. 1 Wednesday, March 15, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
March 15, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 3, No. 11, Ed. 1 Thursday, March 15, 2001
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
March 15, 2001
Creator:
Ezzell, Nancy & Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Bogata News (Bogata, Tex.), Vol. 90, No. 43, Ed. 1 Thursday, March 15, 2001
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
March 15, 2001
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 152, No. 4, Ed. 1 Thursday, March 15, 2001
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 15, 2001
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 157, No. 4, Ed. 1 Wednesday, March 15, 2006
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 15, 2006
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 152, No. 4, Ed. 1 Thursday, March 15, 2001
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 15, 2001
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Fort Worth's first African American business man, John Pratt artwork
Photograph of Panel A of the Historic Wall at Fort Worth's Intermodal Transportation Center, chronicling the African American Marketplace that was there in 1865 to 1940. The text underneath the mural reads "Fort Worth's first African American business man was John Pratt blacksmith. 1865-1876." The public artwork and mural made of tile.
Date:
March 15, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Two-Dimensional Tiled African Mural Panel D
Photograph of Panel D of the Historic Wall at Fort Worth's Intermodal Transportation Center. It chronicles the African American Jim's Hotel. This is a twentieth-century piece created during the 1930s-1940s. This two-dimensional tiled mural is framed with red bricks and is on display for the public.
Date:
March 15, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History