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1Surface structure of cleaved (001) USB2 single crystal surface
Description:
We have achieved what we believe to be the first atomic resolution STM images for a uranium compound USb2 taken at room temperature. The a, b, and c lattice parameters in the images confirm that the tetragonal USb2crystals cleave on the (00 I) basal plane as expected. Our calculations indicate a symmetric cut between Sb planes to be the most favorable cleavage plane and U atoms to be responsible for most ofthe density of states measured by STM. Since the spacing between Sb atoms and between U a…
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Date:
January 1, 2009
Creator:
Chen, Shao-ping
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Article
2008 Wind Energy Projects, Wind Powering America (Poster)
Description:
The Wind Powering America program produces a poster at the end of every calendar year that depicts new U.S. wind energy projects. The 2008 poster includes the following projects: Stetson Wind Farm in Maine; Dutch Hill Wind Farm in New York; Grand Ridge Wind Energy Center in Illinois; Hooper Bay, Alaska; Forestburg, South Dakota; Elbow Creek Wind Project in Texas; Glacier Wind Farm in Montana; Wray, Colorado; Smoky Hills Wind Farm in Kansas; Forbes Park Wind Project in Massachusetts; Spanish For…
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Date:
January 1, 2009
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Article
3D design activities at Fermilab: Opportunities for physics
Description:
Fermilab began exploring the technologies for vertically integrated circuits (also commonly known as 3D circuits) in 2006. These technologies include through silicon vias (TSV), circuit thinning, and bonding techniques to replace conventional bump bonds. Since then, the interest within the High Energy Physics community has grown considerably. This paper will present an overview of the activities at Fermilab over the last 3 years which have helped spark this interest.
Date:
January 1, 2009
Creator:
Yarema, Raymond; Deptuch, Grezgorz; Hoff, Jim; Shenai, Alpana; Trimpl, Marcel; Zimmerman, Tom et al.
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Article
Ab-initio calculations of the hydrogen-uranium system. Part I: Surface phenomena, absorption, transport and trapping
Description:
Density functional theory was applied to the initial steps of uranium hydriding: surface phenomena, absorption, bulk transport and trapping. H adsorbs exothermically to the (0 0 1) surface, yet H absorption into the bulk is endothermic, with off-center octahedral absorption having the lowest absorption energy of 0.39 eV, relative to molecular H{sub 2}. H absorption in interstitial sites causes a local softening of the bulk modulus. Diffusion of H in unstrained {alpha}-U has a barrier of 0.6 eV.…
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Date:
January 1, 2009
Creator:
Taylor, Christopher D & Lillard, R Scott
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Article
Accelerating the disposition of transuranic waste from LANL - 9495
Description:
Los Alamos National Laboratory (LANL) was established during World War II with a single mission -- to design and build an atomic bomb. In the 65 years since, nuclear weapons physics, design and engineering have been the Laboratory's primary and sustaining mission. Experimental and process operations -- and associated cleanout and upgrade activities -- have generated a significant inventory of transuranic (TRU) waste that is stored at LANL's Technical Area 54, Material Disposal Area G (MDA G). W…
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Date:
January 1, 2009
Creator:
Shepard, Mark D; Stiger, Susan G; Blankenhorn, James A; Rael, George J & Moody, David C
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Article
Adaptive anisotropic meshing for steady convection-dominated problems
Description:
Obtaining accurate solutions for convection–diffusion equations is challenging due to the presence of layers when convection dominates the diffusion. To solve this problem, we design an adaptive meshing algorithm which optimizes the alignment of anisotropic meshes with the numerical solution. Three main ingredients are used. First, the streamline upwind Petrov–Galerkin method is used to produce a stabilized solution. Second, an adapted metric tensor is computed from the approximate solution. Th…
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Date:
January 1, 2009
Creator:
Nguyen, Hoa; Gunzburger, Max; Ju, Lili & Burkardt, John
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Article
Adaptive management: a paradigm for remediation of public facilities
Description:
Public facility restoration planning traditionally focused on response to natural disasters and hazardous materials accidental releases. These plans now need to integrate response to terrorist actions. Therefore, plans must address a wide range of potential vulnerabilities. Similar types of broad remediation planning are needed for restoration of waste and hazardous material handling areas and facilities. There are strong similarities in damage results and remediation activities between uninten…
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Date:
January 1, 2009
Creator:
Janecky, David R; Whicker, Jeffrey J & Doerr, Ted B
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Article
Advanced Fuel Cycle Economic Analysis of Symbiotic Light-Water Reactor and Fast Burner Reactor Systems
Description:
The Advanced Fuel Cycle Economic Analysis of Symbiotic Light-Water Reactor and Fast Burner Reactor Systems, prepared to support the U.S. Advanced Fuel Cycle Initiative (AFCI) systems analysis, provides a technology-oriented baseline system cost comparison between the open fuel cycle and closed fuel cycle systems. The intent is to understand their overall cost trends, cost sensitivities, and trade-offs. This analysis also improves the AFCI Program’s understanding of the cost drivers that will de…
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Date:
January 1, 2009
Creator:
Shropshire, D. E.
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Report
Advances in Dust Detection and Removal for Tokamaks
Description:
Dust diagnostics and removal techniques are vital for the safe operation of next step fusion devices such as ITER. In the tokamak environment, large particles or fi bers can fall on the electrostatic detector potentially causing a permanent short. An electrostatic dust detector developed in the laboratory is being applied to the National Spherical Torus Experiment (NSTX). We report on the development of a gas puff system that uses helium to clear such particles from the detector. Experiments at…
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Date:
January 1, 2009
Creator:
Campos, A. & Skinner, C. H.
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Article
Algorithms for optimal dyadic decision trees
Description:
A new algorithm for constructing optimal dyadic decision trees was recently introduced, analyzed, and shown to be very effective for low dimensional data sets. This paper enhances and extends this algorithm by: introducing an adaptive grid search for the regularization parameter that guarantees optimal solutions for all relevant trees sizes, revising the core tree-building algorithm so that its run time is substantially smaller for most regularization parameter values on the grid, and incorpora…
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Date:
January 1, 2009
Creator:
Hush, Don & Porter, Reid
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Article
Analysis and algorithms for a regularized Cauchy problem arising from a non-linear elliptic PDE for seismic velocity estimation
Description:
In the present work we derive and study a nonlinear elliptic PDE coming from the problem of estimation of sound speed inside the Earth. The physical setting of the PDE allows us to pose only a Cauchy problem, and hence is ill-posed. However we are still able to solve it numerically on a long enough time interval to be of practical use. We used two approaches. The first approach is a finite difference time-marching numerical scheme inspired by the Lax-Friedrichs method. The key features of this …
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Date:
January 1, 2009
Creator:
Cameron, M. K.; Fomel, S. B. & Sethian, J. A.
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Article
Analysis of error floor of LDPC codes under LP decoding over the BSC
Description:
We consider linear programming (LP) decoding of a fixed low-density parity-check (LDPC) code over the binary symmetric channel (BSC). The LP decoder fails when it outputs a pseudo-codeword which is not a codeword. We propose an efficient algorithm termed the instanton search algorithm (ISA) which, given a random input, generates a set of flips called the BSC-instanton and prove that: (a) the LP decoder fails for any set of flips with support vector including an instanton; (b) for any input, the…
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Date:
January 1, 2009
Creator:
Chertkov, Michael; Chilappagari, Shashi; Vasic, Bane & Stepanov, Mikhail
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Article
Analysis of Godiva-IV delayed-critical and static super-prompt-critical conditions
Description:
Super-prompt-critical burst experiments were conducted on the Godiva-IV assembly at Los Alamos National Laboratory from the 1960s through 2005. Detailed and simplified benchmark models have been constructed for four delayed-critical experiments and for the static phase of a super-prompt-critical burst experiment. In addition, a two-dimensional cylindrical model has been developed for the super-prompt-critical condition. Criticality calculations have been performed for all of those models with f…
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Date:
January 1, 2009
Creator:
Mosteller, Russell D & Goda, Joetta M
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Article
Analysis of the Surface Drinking Water Provided by Intermittent, Ephemeral, and Headwater Streams in the U.S. Completed by U.S. EPA in July 2009
Description:
A statistical list of each state and its counties. Each county has several drinking water statistics next to it.
Date:
2009~
Creator:
United States. Environmental Protection Agency.
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Text
Analytical Data Report for Sediment Samples Collected From Well 299-E25-236 in the 200-PO-1 Operable Unit
Description:
This is an analytical data report for sediment samples received from CHPRC.
Date:
January 1, 2009
Creator:
Lindberg, Michael J.
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Report
Analytical Study of Stress State in HTS Solenoids
Description:
A main challenge for high field solenoids made of in High Temperature Superconductor (HTS) is the large stress developed in the conductor. This is especially constraining for BSCCO, a brittle and strain sensitive ceramic material. To find parametric correlations useful in magnet design, analytical models can be used. A simple model is herein proposed to obtain the radial, azimuthal and axial stresses in a solenoid as a function of size, i.e. self-field, and of the engineering current density fo…
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Date:
January 1, 2009
Creator:
Barzi, E. & Terzini, E.
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Report
Anomalous diffusion and scaling in coupled stochastic processes
Description:
Inspired by problems in biochemical kinetics, we study statistical properties of an overdamped Langevin processes with the friction coefficient depending on the state of a similar, unobserved, process. Integrating out the latter, we derive the Pocker-Planck the friction coefficient of the first depends on the state of the second. Integrating out the latter, we derive the Focker-Planck equation for the probability distribution of the former. This has the fonn of diffusion equation with time-depe…
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Date:
January 1, 2009
Creator:
Bel, Golan & Nemenman, Ilya
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Article
Application of x-ray tomography to optimization of new NOx/NH3 mixed potential sensors for vehicle on-board emissions control
Description:
Mixed potential sensors for the detection of hydrocarbons, NO{sub x}, and NH{sub 3} have been previously developed at Los Alamos National Laboratory (LANL). The LANL sensors have a unique design incorporating dense ceramic-pelletlmetal-wire electrodes and porous electrolytes. The performance of current-biased sensors using an yttria-stabilized zirconia (YSZ) electrolyte and platinum and La{sub 0.8}Sr{sub 0.2}CrO{sub 3} electrodes is reported. X-ray tomography has been applied to non-destructive…
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Date:
January 1, 2009
Creator:
Nelson, Mark A; Brosha, Eric L; Mukundan, Rangachary & Garzon, Fernando H
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Article
An applied study using systems engineering methods to prioritize green systems options
Description:
For many years, there have been questions about the effectiveness of applying different green solutions. If you're building a home and wish to use green technologies, where do you start? While all technologies sound promising, which will perform the best over time? All this has to be considered within the cost and schedule of the project. The amount of information available on the topic can be overwhelming. We seek to examine if Systems Engineering methods can be used to help people choose and …
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Date:
January 1, 2009
Creator:
Lee, Sonya M & Macdonald, John M
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Article
Approximate inference on planar graphs using loop calculus and belief progagation
Description:
We introduce novel results for approximate inference on planar graphical models using the loop calculus framework. The loop calculus (Chertkov and Chernyak, 2006b) allows to express the exact partition function Z of a graphical model as a finite sum of terms that can be evaluated once the belief propagation (BP) solution is known. In general, full summation over all correction terms is intractable. We develop an algorithm for the approach presented in Chertkov et al. (2008) which represents an …
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Date:
January 1, 2009
Creator:
Chertkov, Michael; Gomez, Vicenc & Kappen, Hilbert
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Article
Arctic Marine Shipping Assessment 2009 Report
Description:
This report discusses the current and future Arctic marine activity. The results of this comprehensive assessment are a range of key findings linked to the main topics identifiers.
Date:
2009
Creator:
Arctic Council. Protection of the Arctic Marine Environment Working Group.
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Report
ART CCIM Phase II-A Off-Gas System Evaluation Test Plan
Description:
This test plan defines testing to be performed using the Idaho National Laboratory (INL) engineering-scale cold crucible induction melter (CCIM) test system for Phase II-A of the Advanced Remediation Technologies (ART) CCIM Project. The multi-phase ART-CCIM Project is developing a conceptual design for replacing the joule-heated melter (JHM) used to treat high level waste (HLW) in the Defense Waste Processing Facility (DWPF) at the Savannah River Site (SRS) with a cold crucible induction melter…
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Date:
January 1, 2009
Creator:
Soelberg, Nick & Roach, Jay
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Report
Assessment of Supply Chain Energy Efficiency Potentials: A U.S. Case Study
Description:
This paper summarizes a modeling framework that characterizes the key underlying technologies and processes that contribute to the supply chain energy use and greenhouse gas (GHG) emissions of a variety of goods and services purchased by U.S. consumers. The framework couples an input-output supply chain modeling approach with"bottom-up" fuel end use models for individual IO sectors. This fuel end use modeling detail allows energy and policy analysts to better understand the underlying…
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Date:
January 1, 2009
Creator:
Masanet, Eric; Kramer, Klaas Jan; Homan, Gregory; Brown, Richard & Worrell, Ernst
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Article
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