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2,310 Matching Results
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Nuclear Power Plant Design and Seismic Safety Considerations
This report presents some of the general design concepts of operating nuclear power plants in order to discuss design considerations for seismic events. This report does not attempt to conclude whether one design is inherently safer or less safe than another plant. Nor does it attempt to conclude whether operating nuclear power plants are at any greater or lesser risk from earthquakes given recent updates to seismic data and seismic hazard maps.
Date:
January 12, 2012
Creator:
Andrews, Anthony & Folger, Peter
Object Type:
Report
System:
The UNT Digital Library
Recovery Act: Energy Efficiency of Data Networks through Rate Adaptation (EEDNRA) - Final Technical Report
This Concept Definition Study focused on developing a scientific understanding of methods to reduce energy consumption in data networks using rate adaptation. Rate adaptation is a collection of techniques that reduce energy consumption when traffic is light, and only require full energy when traffic is at full provisioned capacity. Rate adaptation is a very promising technique for saving energy: modern data networks are typically operated at average rates well below capacity, but network equipment has not yet been designed to incorporate rate adaptation. The Study concerns packet-switching equipment, routers and switches; such equipment forms the backbone of the modern Internet. The focus of the study is on algorithms and protocols that can be implemented in software or firmware to exploit hardware power-control mechanisms. Hardware power-control mechanisms are widely used in the computer industry, and are beginning to be available for networking equipment as well. Network equipment has different performance requirements than computer equipment because of the very fast rate of packet arrival; hence novel power-control algorithms are required for networking. This study resulted in five published papers, one internal report, and two patent applications, documented below. The specific technical accomplishments are the following: • A model for the power consumption …
Date:
July 12, 2011
Creator:
Andrews, Matthew; Antonakopoulos, Spyridon; Fortune, Steve; Francini, Andrea & Zhang, Lisa
Object Type:
Report
System:
The UNT Digital Library
Accelerated Gibbs Sampling for Infinite Sparse Factor Analysis
The Indian Buffet Process (IBP) gives a probabilistic model of sparse binary matrices with an unbounded number of columns. This construct can be used, for example, to model a fixed numer of observed data points (rows) associated with an unknown number of latent features (columns). Markov Chain Monte Carlo (MCMC) methods are often used for IBP inference, and in this technical note, we provide a detailed review of the derivations of collapsed and accelerated Gibbs samplers for the linear-Gaussian infinite latent feature model. We also discuss and explain update equations for hyperparameter resampling in a 'full Bayesian' treatment and present a novel slice sampler capable of extending the accelerated Gibbs sampler to the case of infinite sparse factor analysis by allowing the use of real-valued latent features.
Date:
September 12, 2011
Creator:
Andrzejewski, D M
Object Type:
Report
System:
The UNT Digital Library
Summary of LIFE Delivery Plan
None
Date:
June 12, 2013
Creator:
Anklam, T M
Object Type:
Report
System:
The UNT Digital Library
Northern Ireland: Current Issues and Ongoing Challenges in the Peace Process
This report discusses the history of the implementation of the 1998 "Good Friday" Peace Agreement in Northern Ireland, ongoing challenges in the peace process, initiatives to further peace, and current issues surrounding the collapse of the devolved government and the refusal to form a coalition by either major party and the Brexit negotiations.
Date:
March 12, 2018
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
Northern Ireland, Brexit, and the Irish Border
This report discusses the issue of Northern Ireland's border with the Republic of Ireland following Brexit and the ongoing negotiations regarding the issue.
Date:
March 12, 2018
Creator:
Archick, Kristin & Mix, Derek E.
Object Type:
Report
System:
The UNT Digital Library
The United States and Europe: Responding to Change in the Middle East and North Africa
This report assesses some of the policy implications of recent and ongoing events in the Middle East region, provides an overview of U.S. responses to date, and explores select case studies to illustrate some key questions and dilemmas that Congress and the executive branch may face with regard to these issues and others in the future.
Date:
June 12, 2013
Creator:
Archick, Kristin & Mix, Derek E.
Object Type:
Report
System:
The UNT Digital Library
Dispersion in the Presence of Strong Transverse Wakefields
To minimize emittance growth in a long linac, it is necessary to control the wakefields by correcting the beam orbit excursions. In addition, the particle energy is made to vary along the length of the bunch to introduce a damping, known as the BNS damping, to the beam break-up effect. In this paper, we use a two-particle model to examine the relative magnitudes of the various orbit and dispersion functions involved. The results are applied to calculate the effect of a closed orbit bump and a misaligned structure. It is shown that wake-induced dispersion is an important contribution to the beam dynamics in long linacs with strong wakefields like SLC.
Date:
August 12, 2011
Creator:
Assmann, Ralph & Chao, Alex
Object Type:
Article
System:
The UNT Digital Library
Collaboration, Automation, and Information Management at Hanford High Level Radioactive Waste (HLW) Tank Farms - 14210
Washington River Protection Solutions (WRPS), operator of High Level Radioactive Waste (HLW) Tank Farms at the Hanford Site, is taking an over 20-year leap in technology, replacing systems that were monitored with clipboards and obsolete computer systems, as well as solving major operations and maintenance hurdles in the area of process automation and information management. While WRPS is fully compliant with procedures and regulations, the current systems are not integrated and do not share data efficiently, hampering how information is obtained and managed.
Date:
December 12, 2013
Creator:
Aurah, Mirwaise Y. & Roberts, Mark A.
Object Type:
Article
System:
The UNT Digital Library
Trends in Discretionary Spending
This report discusses historical, current, and projected discretionary spending trends. It also describes how current discretionary spending trends reflect national priorities. Discretionary spending is provided in, and controlled by, annual appropriations acts, which fund many of the routine activities commonly associated with such federal government functions as running executive branch agencies, congressional offices and agencies, and international operations of the government.
Date:
April 12, 2010
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Building America Best Practices Series, Volume 10: Retrofit Techniques and Technologies: Air Sealing
This report was prepared by PNNL for the U.S. Department of Energy Building America Program. The report provides information to home owners who want to make their existing homes more energy efficient by sealing leaks in the building envelope (ceiling, walls, and floors) that let in drafts and let conditioned air escape. The report provides descriptions of 19 key areas of the home where air sealing can improve home performance and energy efficiency. The report includes suggestions on how to find a qualified weatherization or home performance contractor, what to expect in a home energy audit, opportune times for performing air sealing, and what safety and health concerns to be aware of. The report describes some basic building science concepts and topics related to air sealing including ventilation, diagnostic tools, and code requirements. The report will be available for free download from the DOE Building America website. It is a suitable consumer education tool for home performance and weatherization contractors to share with customers to describe the process and value of home energy retrofits.
Date:
April 12, 2010
Creator:
Baechler, Michael C.; Gilbride, Theresa L.; Hefty, Marye G.; Cole, Pamala C.; Williamson, Jennifer L. & Love, Pat M.
Object Type:
Report
System:
The UNT Digital Library
Status and Plans for the Polarized Hadron Collider RHIC
N/A
Date:
May 12, 2013
Creator:
Bai, M.; Ahrens, L.; Aschenauer, E. C.; Atoian, G.; Beebe-Wang, J.; Blaskiewicz, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Heavy octets and Tevatron signals with three or four b jets
Hypothetical color-octet particles of spin 0, pair-produced at hadron colliders through their QCD coupling, may lead to final states involving three or four b jets. We analyze kinematic distributions of the 3b final state that differentiate the scalar octets from supersymmetric Higgs bosons. Studying the scalar sector that breaks an SU(3) x SU(3) gauge symmetry down to the QCD gauge group, we find that the scalar octet is resonantly produced in pairs via a spin-1 octet (coloron). A scalar octet of mass in the 140-150 GeV range can explain the nonstandard shape of the b-jet transverse energy distributions reported by the CDF Collaboration, especially when the coloron mass is slightly above twice the scalar mass. The dominant decay mode of the scalar octet is into a pair of gluons, so that the production of a pair of dijet resonances is large in this model, of about 40 pb at the Tevatron. Even when a W boson is radiated from the initial state, the inclusive cross section for producing a dijet resonance near the scalar octet mass remains sizable, around 0.15 pb.
Date:
August 12, 2011
Creator:
Bai, Yang & Dobrescu, Bogdan A.
Object Type:
Article
System:
The UNT Digital Library
LHC Predictions from a Tevatron Anomaly in the Top Quark Forward-Backward Asymmetry
We examine the implications of the recent CDF measurement of the top-quark forward-backward asymmetry, focusing on a scenario with a new color octet vector boson at 1-3 TeV. We study several models, as well as a general effective field theory, and determine the parameter space which provides the best simultaneous fit to the CDF asymmetry, the Tevatron top pair production cross section, and the exclusion regions from LHC dijet resonance and contact interaction searches. Flavor constraints on these models are more subtle and less severe than the literature indicates. We find a large region of allowed parameter space at high axigluon mass and a smaller region at low mass; we match the latter to an SU(3){sub 1} x SU(3){sub 2}/SU(3){sub c} coset model with a heavy vector-like fermion. Our scenario produces discoverable effects at the LHC with only 1-2 inverse femtobarns of luminosity at 7-8 TeV. Lastly, we point out that a Tevatron measurement of the b-quark forward-backward asymmetry would be very helpful in characterizing the physics underlying the top-quark asymmetry.
Date:
August 12, 2011
Creator:
Bai, Yang; Hewett, JoAnne L.; Kaplan, Jared & Rizzo, Thomas G.
Object Type:
Article
System:
The UNT Digital Library
The Greatest Mathematical Discovery?
What mathematical discovery more than 1500 years ago: (1) Is one of the greatest, if not the greatest, single discovery in the field of mathematics? (2) Involved three subtle ideas that eluded the greatest minds of antiquity, even geniuses such as Archimedes? (3) Was fiercely resisted in Europe for hundreds of years after its discovery? (4) Even today, in historical treatments of mathematics, is often dismissed with scant mention, or else is ascribed to the wrong source? Answer: Our modern system of positional decimal notation with zero, together with the basic arithmetic computational schemes, which were discovered in India about 500 CE.
Date:
May 12, 2010
Creator:
Bailey, David H. & Borwein, Jonathan M.
Object Type:
Report
System:
The UNT Digital Library
Scaling Algebraic Multigrid Solvers: On the Road to Exascale
Algebraic Multigrid (AMG) solvers are an essential component of many large-scale scientific simulation codes. Their continued numerical scalability and efficient implementation is critical for preparing these codes for exascale. Our experiences on modern multi-core machines show that significant challenges must be addressed for AMG to perform well on such machines. We discuss our experiences and describe the techniques we have used to overcome scalability challenges for AMG on hybrid architectures in preparation for exascale.
Date:
December 12, 2010
Creator:
Baker, A H; Falgout, R D; Gamblin, T; Kolev, T; Schulz, M & Yang, U M
Object Type:
Article
System:
The UNT Digital Library
Challenges of Algebraic Multigrid across Multicore Architectures
Algebraic multigrid (AMG) is a popular solver for large-scale scientific computing and an essential component of many simulation codes. AMG has shown to be extremely efficient on distributed-memory architectures. However, when executed on modern multicore architectures, we face new challenges that can significantly deteriorate AMG's performance. We examine its performance and scalability on three disparate multicore architectures: a cluster with four AMD Opteron Quad-core processors per node (Hera), a Cray XT5 with two AMD Opteron Hex-core processors per node (Jaguar), and an IBM BlueGene/P system with a single Quad-core processor (Intrepid). We discuss our experiences on these platforms and present results using both an MPI-only and a hybrid MPI/OpenMP model. We also discuss a set of techniques that helped to overcome the associated problems, including thread and process pinning and correct memory associations.
Date:
April 12, 2010
Creator:
Baker, A H; Gamblin, T; Schulz, M & Yang, U M
Object Type:
Article
System:
The UNT Digital Library
Assessment of Energy Storage Alternatives in the Puget Sound Energy System
As part of an ongoing study co-funded by the Bonneville Power Administration, under its Technology Innovation Grant Program, and the U.S. Department of Energy, the Pacific Northwest National Laboratory (PNNL) has developed an approach and modeling tool for assessing the net benefits of using energy storage located close to the customer in the distribution grid to manage demand. PNNL in collaboration with PSE and Primus Power has evaluated the net benefits of placing a zinc bromide battery system at two locations in the PSE system (Baker River / Rockport and Bainbridge Island). Energy storage can provide a number of benefits to the utility through the increased flexibility it provides to the grid system. Applications evaluated in the assessment include capacity value, balancing services, arbitrage, distribution deferral and outage mitigation. This report outlines the methodology developed for this study and Phase I results.
Date:
December 12, 2013
Creator:
Balducci, Patrick J.; Jin, Chunlian; Wu, Di; Kintner-Meyer, Michael CW; Leslie, Patrick & Daitch, Charles
Object Type:
Report
System:
The UNT Digital Library
A Flexible Reservation Algorithm for Advance Network Provisioning
Many scientific applications need support from a communication infrastructure that provides predictable performance, which requires effective algorithms for bandwidth reservations. Network reservation systems such as ESnet's OSCARS, establish guaranteed bandwidth of secure virtual circuits for a certain bandwidth and length of time. However, users currently cannot inquire about bandwidth availability, nor have alternative suggestions when reservation requests fail. In general, the number of reservation options is exponential with the number of nodes n, and current reservation commitments. We present a novel approach for path finding in time-dependent networks taking advantage of user-provided parameters of total volume and time constraints, which produces options for earliest completion and shortest duration. The theoretical complexity is only O(n2r2) in the worst-case, where r is the number of reservations in the desired time interval. We have implemented our algorithm and developed efficient methodologies for incorporation into network reservation frameworks. Performance measurements confirm the theoretical predictions.
Date:
April 12, 2010
Creator:
Balman, Mehmet; Chaniotakis, Evangelos; Shoshani, Arie & Sim, Alex
Object Type:
Article
System:
The UNT Digital Library
Final Report - Summer Visit 2010
During my visit to LLNL during the summer of 2010, I worked on algebraic multilevel solvers for large sparse systems of linear equations arising from discretizations of partial differential equations. The particular solver of interest is based on ILU decomposition. The setup phase for this AMG solve is just the single ILU decomposition, and its corresponding error matrix. Because the ILU uses a minimum degree or similar sparse matrix ordering, most of the fill-in, and hence most of the error, is concentrated in the lower right corner of the factored matrix. All of the major multigrid components - the smoother, the coarse level correction matrices, and the fine-to-coarse and coarse-to-fine rectangular transfer matrices, are defined in terms of various blocks of the ILU factorization. Although such a strategy is not likely to be optimal in terms of convergence properties, it has a relatively low setup cost, and therefore is useful in situations where setup costs for more traditional AMG approaches cannot be amortized over the solution of many linear systems using the same matrix. Such a situation arises in adaptive methods, where often just one linear system is solved at each step of an adaptive feedback loop, or in solving …
Date:
September 12, 2011
Creator:
Bank, R
Object Type:
Report
System:
The UNT Digital Library
SALTSTONE 3QCY11 TCLP RESULTS
A Saltstone waste form was prepared in the Savannah River National Laboratory (SRNL) from a Tank 50H sample and Z-Area premix material for the third quarter of calendar year 2011 (3QCY11). After the prescribed 32 day cure, samples of the saltstone were collected, and the waste form was shown to meet the South Carolina Hazardous Waste Management Regulations (SCHWMR) R.61-79.261.24 and R.61-79.268.48(a) requirements for a nonhazardous waste form with respect to RCRA metals and underlying hazardous constituents. These analyses met all quality assurance specifications of USEPA SW-846. The Saltstone Production Facility (SPF) receives waste from Tank 50H for treatment. In the third quarter of the 2011 calendar year (3QCY11), Tank 50H accepted transfers of approximately 20 kgal from the Effluent Treatment Project (ETP), approximately 236 kgal from the Actinide Removal Process/Modular Caustic Side Solvent Extraction Unit (ARP/MCU) Decontaminated Salt Solution Hold Tank (DSS-HT), and approximately 25 kgal from other sources. The Saltstone Grout Sampling plan provides the South Carolina Department of Health and Environmental Control (SCDHEC) with the chemical and physical characterization strategy for the salt solution which is to be disposed of in the Z-Area Solid Waste Landfill (SWLF). During operation, samples were collected from Tank 50H and grout …
Date:
January 12, 2012
Creator:
Bannochie, C.
Object Type:
Report
System:
The UNT Digital Library
Stimulated Superconductivity at Strong Coupling
Stimulating a system with time dependent sources can enhance instabilities, thus increasing the critical temperature at which the system transitions to interesting low-temperature phases such as superconductivity or superfluidity. After reviewing this phenomenon in non-equilibrium BCS theory (and its marginal fermi liquid generalization) we analyze the effect in holographic superconductors. We exhibit a simple regime in which the transition temperature increases parametrically as we increase the frequency of the time-dependent source.
Date:
August 12, 2011
Creator:
Bao, Ning; Dong, Xi; Silverstein, Eva; Torroba, Gonzalo & /Stanford U., ITP /Stanford U., Phys. Dept. /SLAC
Object Type:
Report
System:
The UNT Digital Library
International Agreements on Climate Change: Selected Legal Questions
This report provides background information on global climate change negotiations. The report discuses the United Nations framework for convention for climate change, the Kyoto protocol, and the Copenhagen accord.
Date:
April 12, 2010
Creator:
Barbour, Emily C.
Object Type:
Report
System:
The UNT Digital Library
A Benchmark Model for Parallel ns3
None
Date:
December 12, 2011
Creator:
Barnes, P. D.
Object Type:
Article
System:
The UNT Digital Library