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NUCLEAR WASTE GLASSES CONTINUOUS MELTING AND BULK VITRIFICAITON
This contribution addresses various aspects of nuclear waste vitrification. Nuclear wastes have a variety of components and composition ranges. For each waste composition, the glass must be formulated to possess acceptable processing and product behavior defined in terms of physical and chemical properties that guarantee the glass can be easily made and resist environmental degradation. Glass formulation is facilitated by developing property-composition models, and the strategy of model development and application is reviewed. However, the large variability of waste compositions presents numerous additional challenges: insoluble solids and molten salts may segregate; foam may hinder heat transfer and slow down the process; molten salts may accumulate in container refractory walls; the glass on cooling may precipitate crystalline phases. These problems need targeted exploratory research. Examples of specific problems and their possible solutions are discussed.
Date:
March 24, 2008
Creator:
AA, KRUGER & PR, HRMA
Object Type:
Article
System:
The UNT Digital Library
DWPF GLASS BEADS AND GLASS FRIT TRANSPORT DEMONSTRATION
DWPF is considering replacing irregularly shaped glass frit with spherical glass beads in the Slurry Mix Evaporator (SME) process to decrease the yield stress of the melter feed (a non-Newtonian Bingham Plastic). Pilot-scale testing was conducted on spherical glass beads and glass frit to determine how well the glass beads would transfer when compared to the glass frit. Process Engineering Development designed and constructed the test apparatus to aid in the understanding and impacts that spherical glass beads may have on the existing DWPF Frit Transfer System. Testing was conducted to determine if the lines would plug with the glass beads and the glass frit slurry and what is required to unplug the lines. The flow loop consisted of vertical and horizontal runs of clear PVC piping, similar in geometry to the existing system. Two different batches of glass slurry were tested: a batch of 50 wt% spherical glass beads and a batch of 50 wt% glass frit in process water. No chemicals such as formic acid was used in slurry, only water and glass formers. The glass beads used for this testing were commercially available borosilicate glass of mesh size -100+200. The glass frit was Frit 418 obtained from …
Date:
November 24, 2008
Creator:
Adamson, D & Bradley Pickenheim, B
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 4, Ed. 1 Thursday, January 24, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
January 24, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 17, Ed. 1 Thursday, April 24, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 24, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 30, Ed. 1 Thursday, July 24, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 24, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Guide to Individuals Seated on the House Dais
This report provides information about the Guide to Individuals Seated on the House Dais. The house of representatives meets in the capitol in the house chamber.
Date:
April 24, 2008
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
Processing Neutron Cross Section Covariances using NJOY-99 and PUFF-IV
With the growing demand for multigroup covariances, the National Nuclear Data Center (NNDC) has been experiencing an upsurge in its covariance data processing activities using the two US codes NJOY-99 (LANL) and PUFF-IV (ORNL). The code NJOY-99 was upgraded by incorporating the new module ERRORJ-2.3, while the NNDC served as the active user and provided feedback. The NNDC has been primarily processing neutron cross section covariances on its 64-bit Linux cluster in support of two DOE programs, the Global Nuclear Energy Partnership (GNEP) and the Nuclear Criticality Safety Program (NCSP). For GNEP, the NNDC used NJOY-99.259 to generate multigroup covariance matrices of {sup 56}Fe, {sup 23}Na, {sup 239}Pu, {sup 235}U and {sup 238}U from the JENDL-3.3 library using the 15-, 33-, and 230-energy group structures. These covariance matrices will be used to test a new collapsing algorithm which will subsequently be employed to calculate uncertainties on integral parameters in different fast neutron-based systems. For NCSP, we used PUFF-IV 1.0.4 to verify the processability of new evaluated covariance data of {sup 55}Mn, {sup 239}Pu, {sup 233}U, {sup 235}U and {sup 238}U generated by a collaboration of ORNL and LANL. For the data end-users at large, the NNDC has made available a …
Date:
June 24, 2008
Creator:
Arcilla, R.; Kahler, A. C.; Oblozinsky, P. & Herman, M.
Object Type:
Article
System:
The UNT Digital Library
Size reduction of complex networks preserving modularity
The ubiquity of modular structure in real-world complex networks is being the focus of attention in many trials to understand the interplay between network topology and functionality. The best approaches to the identification of modular structure are based on the optimization of a quality function known as modularity. However this optimization is a hard task provided that the computational complexity of the problem is in the NP-hard class. Here we propose an exact method for reducing the size of weighted (directed and undirected) complex networks while maintaining invariant its modularity. This size reduction allows the heuristic algorithms that optimize modularity for a better exploration of the modularity landscape. We compare the modularity obtained in several real complex-networks by using the Extremal Optimization algorithm, before and after the size reduction, showing the improvement obtained. We speculate that the proposed analytical size reduction could be extended to an exact coarse graining of the network in the scope of real-space renormalization.
Date:
December 24, 2008
Creator:
Arenas, A.; Duch, J.; Fernandez, A. & Gomez, S.
Object Type:
Article
System:
The UNT Digital Library
Toward Control of Matter: Basic Energy Science Needs for a New Class of X-Ray Light Sources
Over the past quarter century, light-source user facilities have transformed research in areas ranging from gas-phase chemical dynamics to materials characterization. The ever-improving capabilities of these facilities have revolutionized our ability to study the electronic structure and dynamics of atoms, molecules, and even the most complex new materials, to understand catalytic reactions, to visualize magnetic domains, and to solve protein structures. Yet these outstanding facilities still have limitations well understood by their thousands of users. Accordingly, over the past several years, many proposals and conceptual designs for"next-generation" x-ray light sources have been developed around the world. In order to survey the scientific problems that might be addressed specifically by those new light sources operating below a photon energy of about 3 keV and to identify the scientific requirements that should drive the design of such facilities, a workshop"Science for a New Class of Soft X-Ray Light Sources" was held in Berkeley in October 2007. From an analysisof the most compelling scientific questions that could be identified and the experimental requirements for answering them, we set out to define, without regard to the specific technologies upon which they might be based, the capabilities such light sources would have to deliver in …
Date:
September 24, 2008
Creator:
Arenholz, Elke; Belkacem, Ali; Cocke, Lew; Corlett, John; Falcone, Roger; Fischer, Peter et al.
Object Type:
Article
System:
The UNT Digital Library
Master's Recital: 2008-03-24 - Ian Argys, jazz guitar
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Kenton Hall in partial fulfillment of the Master of Music (MM) degree.
Date:
March 24, 2008
Creator:
Argys, Ian
Object Type:
Sound
System:
The UNT Digital Library
Why Rich Religion Gets Its Way
Lecture given Wednesday, September 24, 2008, 1:30 PM at Abilene Christian University: "Most Christians say they reject 'health and wealth' theology. Most Christians seem to want more than anything to be healthy and wealthy. Amos has something to say to most Christians."
Date:
September 24, 2008
Creator:
Atchley, Rick
Object Type:
Sound
System:
The Portal to Texas History
Measurement of the tau- to eta pi-pi+pi-nu tau Branching Fraction and a Search for a Second-Class Current in the tau- to eta'(958)pi-nu tau Decay
The {tau}{sup -} {yields} {eta}{pi}{sup -}{pi}{sup +}{pi}{sup -}{nu}{sub {tau}} decay with the {eta} {yields} {gamma}{gamma} mode is studied using 384 fb{sup -1} of data collected by the BABAR detector. The branching fraction is measured to be (1.60 {+-} 0.05 {+-} 0.11) x 10{sup -4}. It is found that {tau}{sup -} {yields} f{sub 1}(1285){pi}{sup -} {nu}{sub {tau}} {yields} {eta}{pi}{sup -}{pi}{sup +}{pi}{sup -}{nu}{sub {tau}} is the dominant decay mode with a branching fraction of (1.11 {+-} 0.06 {+-} 0.05) x 10{sup -4}. The first error on the branching fractions is statistical and the second systematic. In addition, a 90% confidence level upper limit on the branching fraction of the {tau}{sup -} {yields} {eta}{prime}(958){pi}{sup -}{nu}{sub {tau}} decay is measured to be 7.2 x 10{sup -6}. This last decay proceeds through a second-class current and is expected to be forbidden in the limit of isospin symmetry.
Date:
March 24, 2008
Creator:
Aubert, B.; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J. P.; Poireau, V. et al.
Object Type:
Article
System:
The UNT Digital Library
Would the Apostle Paul Use the Internet? Missions in a Wired World - Be Plugged into All Your Mission Efforts Through Creative Internet Use
Lecture given Wednesday, September 24, 2008, 4:00 PM at Abilene Christian University: "Would you like to live with continuous contact with your missionaries and their work? Could you stretch your missions budget dollar? Find out how your missions program can expand, become more personal and more immediate."
Date:
September 24, 2008
Creator:
Austin, Steve
Object Type:
Sound
System:
The Portal to Texas History
PERI - Auto-tuning Memory Intensive Kernels for Multicore
We present an auto-tuning approach to optimize application performance on emerging multicore architectures. The methodology extends the idea of search-based performance optimizations, popular in linear algebra and FFT libraries, to application-specific computational kernels. Our work applies this strategy to Sparse Matrix Vector Multiplication (SpMV), the explicit heat equation PDE on a regular grid (Stencil), and a lattice Boltzmann application (LBMHD). We explore one of the broadest sets of multicore architectures in the HPC literature, including the Intel Xeon Clovertown, AMD Opteron Barcelona, Sun Victoria Falls, and the Sony-Toshiba-IBM (STI) Cell. Rather than hand-tuning each kernel for each system, we develop a code generator for each kernel that allows us to identify a highly optimized version for each platform, while amortizing the human programming effort. Results show that our auto-tuned kernel applications often achieve a better than 4X improvement compared with the original code. Additionally, we analyze a Roofline performance model for each platform to reveal hardware bottlenecks and software challenges for future multicore systems and applications.
Date:
June 24, 2008
Creator:
Bailey, David H.; Williams, Samuel; Datta, Kaushik; Carter, Jonathan; Oliker, Leonid; Shalf, John et al.
Object Type:
Article
System:
The UNT Digital Library
Integrated Computing, Communication, and Distributed Control of Deregulated Electric Power Systems
Restructuring of the electricity market has affected all aspects of the power industry from generation to transmission, distribution, and consumption. Transmission circuits, in particular, are stressed often exceeding their stability limits because of the difficulty in building new transmission lines due to environmental concerns and financial risk. Deregulation has resulted in the need for tighter control strategies to maintain reliability even in the event of considerable structural changes, such as loss of a large generating unit or a transmission line, and changes in loading conditions due to the continuously varying power consumption. Our research efforts under the DOE EPSCoR Grant focused on Integrated Computing, Communication and Distributed Control of Deregulated Electric Power Systems. This research is applicable to operating and controlling modern electric energy systems. The controls developed by APERC provide for a more efficient, economical, reliable, and secure operation of these systems. Under this program, we developed distributed control algorithms suitable for large-scale geographically dispersed power systems and also economic tools to evaluate their effectiveness and impact on power markets. Progress was made in the development of distributed intelligent control agents for reliable and automated operation of integrated electric power systems. The methodologies employed combine information technology, control and …
Date:
September 24, 2008
Creator:
Bajura, Richard & Feliachi, Ali
Object Type:
Report
System:
The UNT Digital Library
Measurements of Coherent Synchrotron Radiation and its Impact on the LCLS Electron Beam
In order to reach the high peak current required for an x-ray FEL, two separate magnetic dipole chicanes are used in the LCLS accelerator to compress the electron bunch length in stages. In these bunch compressors, coherent synchrotron radiation (CSR) can be emitted-induced either by a short electron bunch, or by any longitudinal density modulation that may be on the bunch. We present measurements, simulations, and analysis of (1) the CSR-induced energy loss, (2) the related transverse emittance growth, and (3) the microbunching-induced CSR directly observed at optical wavelengths.
Date:
September 24, 2008
Creator:
Bane, K. L. F.; Decker, F. J.; Ding, Y.; Dowell, D.; Emma, P.; Frisch, J. et al.
Object Type:
Article
System:
The UNT Digital Library
How Bills Amend Statutes
None
Date:
June 24, 2008
Creator:
Beth, Richard S.
Object Type:
Report
System:
The UNT Digital Library
Campus Evangelism, Campus Revival, and Spiritual Awakening - Mobilizing Campus Ministries for Maximum Impact
Lecture given Wednesday, September 24, 2008, 8:30 AM at Abilene Christian University: "In the 1960s, campus evangelism was the most exciting and controversial movement among Churches of Christ. Led by Jim Bevis and Rex Vermillion, the short-lived ministry touched more than 40,000 students and some 400 campuses. Campus Evangelism "closed its doors" in 1970. Jim Bevis, co-founder of CE, shares his perspective of what happened."
Date:
September 24, 2008
Creator:
Bevis, Jim R.
Object Type:
Sound
System:
The Portal to Texas History
Federal Credit Reform: Implementation of the Changed Budgetary Treatment of Direct Loans and Loan Guarantees
This report is to explain the provisions of the Federal Credit Reform Act (FCRA), examine the implementation of credit reform including credit reform provisions of the Balanced Budget Act of 1997 (BBA97), and discuss proposed modifications of credit reform. In order to achieve these objectives, it is necessary to initially discuss justifications for credit programs, federal credit concepts, and the budgetary treatment of federal credit before the FCRA.
Date:
June 24, 2008
Creator:
Bickley, James M.
Object Type:
Report
System:
The UNT Digital Library
Investigation of the Relationship between Green Design and Project Delivery Methods
The selection of the project delivery method (PDM) for any project is critical--it establishes communication, coordination, and contractual issues between the owner, contractor, and designer. With an increase in the number of green design projects, understanding the relationship between the PDM and green design is paramount to project and contract management. It is reasonable to assume that a positive relationship between green design and design-build (DB) exists since both theoretically are intended to foster an integrated, holistic, and collaborative project. This research examines the relationship between the design-bid-build (DBB), construction management (CM), and DB PDMs and green design with the goal of establishing best practices and identifying potential synergies between them. The research collected information by conducting primarily telephone interviews with approximately twenty-five individuals, including owners, contractors, and designers involved in completed green design projects, mainly in the public sector. The interviews developed a general understanding of the current state of knowledge and experience and not a rigorous quantitative analysis. Upon completion of the interviews, the tabulated results were summarized and green project characteristics and project-PDM interactions emerged. Existing published research was evaluated to reveal aspects of PDMs independent of green design. Best practices were ascertained by combining information from …
Date:
April 24, 2008
Creator:
Bilec, Melissa M. & Ries, Robert J.
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Narcotics and U.S. Policy
This report provides current statistical information, profiles the Afghanistan narcotics trade's participants, explores linkages between narcotics, insecurity, and corruption, and reviews U.S. and international policy responses since late 2001. The report also considers ongoing policy debates regarding the counternarcotics role of coalition military forces, poppy eradication, alternative livelihoods, and funding issues for Congress.
Date:
January 24, 2008
Creator:
Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
The Islamic Traditions of Wahhabism and Salafiyya
This report provides a background on these traditions and their relationship to active terrorist groups; it also summarizes recent charges and responses, including the findings of the final report of the 9/11 Commission and relevant legislation in the 110th Congress.
Date:
January 24, 2008
Creator:
Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
International Population Assistance and Family Planning Programs: Issues for Congress
This report discusses the U.S. population assistance issues, policy issues in the U.S. family planning debate, and U.S. funding levels.
Date:
July 24, 2008
Creator:
Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library
The U.N. Population Fund: Background and the U.S. Funding Debate
This report provides an overview of the United Nations Population Fund (UNFPA), its current mission and operations, and recent funding trends. It further discusses the role of the United States in supporting the UNFPA programs, the varying interpretations by several Administrations of legislative authorities pertaining to UNFPA's eligibility for American resources, and congressional debates over how much and under what conditions the United States should voluntarily contribute to UNFPA operations. Finally, it reviews the findings of several private and U.S. government investigations of China's family planning programs and the role UNFPA plays in their implementation.
Date:
July 24, 2008
Creator:
Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library