21 Matching Results

Explore Results

Results: 1 - 21
open access

Asymmetric injection of cathodic arc plasma into a macroparticlefilter

Description: The cathodic arc plasmas produced by cathode spots usuallyinclude macroparticles, which is undesirable for many applications. Acommon way of removing macroparticles is to use curved solenoid filterswhich guide the plasma from the source to the substrate. In this work, anarc source with relatively small cathode is used, limiting the possiblelocations of plasma production. The relative position of cathodic arcsource and macroparticle filtered was systematically varied and thefiltered plasma curre… more
Date: February 11, 2004
Creator: Anders, Andre & MacGill, Robert A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Speckle Imaging of Titan at 2 microns: Surface Albedo, Haze Optical Depth, and Tropospheric Clouds 1996-1998

Description: We present results from 14 nights of observations of Titan in 1996-1998 using near-infrared (centered at 2.1 microns) speckle imaging at the 10-meter W.M. Keck Telescope. The observations have a spatial resolution of 0.06 arcseconds. We detect bright clouds on three days in October 1998, with a brightness about 0.5% of the brightness of Titan. Using a 16-stream radiative transfer model (DISORT) to model the central equatorial longitude of each image, we construct a suite of surface albedo model… more
Date: February 11, 2004
Creator: Gibbard, S. G.; Gavel, D.; Ghez, A. M.; de Pater, I.; Max, C. E.; Young, E. F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Visa Issuances: Policy, Issues, and Legislation

Description: This report opens with an overview of visa issuances, with sections on procedures for aliens coming to live in the United States permanently and on procedures for aliens admitted for temporary stays. It includes a discussion of visa screening policies, including inadmissibility, databases, an analysis of visa refusals, biometric visas and other major visa policy procedures. Summaries of key laws revising visa policy enacted in the 107th Congress follows. The final section analyzes selected issu… more
Date: February 11, 2004
Creator: Wasem, Ruth Ellen
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ENHANCED RECOVERY UTILIZING VARIABLE FREQUENCY DRIVES AND A DISTRIBUTED POWER SYSTEM TECHNICAL PROGRESS REPORT

Description: This report describes the progress made during first six months of the project entitled ''Enhanced Recovery Utilizing Variable Frequency Drives and a Distributed Power System''. During this period, project plan, demonstration plan and project schedule were developed, equipment was ordered and baseline data was collected.
Date: February 11, 2004
Creator: Peden, Randy & Shah, Sanjiv
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Proposed New LLW Disposal Activity Disposal of No Dose/Low Dose Scrap Metal in Slit Trenches

Description: Activated metal is a special waste that requires evaluation for disposal. Contaminants in the activated metal will leach more slowly than will contaminants in generic waste. There is an inventory of activated scrap metal in the 105-L Disassembly Basin. Approximately 1,600 ft3 of the material is characterized as ''No Dose/Low Dose'' and consists mainly of activated aluminum and aluminum alloy pieces and parts and no stainless steel with a dose rate less than 200 mR per hr. Contaminants in the ac… more
Date: February 11, 2004
Creator: Cook, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

UZ Flow Models and Submodels

Description: The purpose of this Model Report is to document the unsaturated zone (UZ) fluid flow and tracer transport models and submodels as well as the flow fields generated utilizing the UZ Flow and Transport Model of Yucca Mountain (UZ Model), Nevada. This work was planned in ''Technical Work Plan (TWP) for: Performance Assessment Unsaturated Zone'' (BSC 2002 [160819], Section 1.10, Work Package AUZM06). The UZ Model has revised, updated, and enhanced the previous UZ Flow Model REV 00 ICN 01 (BSC 2001 … more
Date: February 11, 2004
Creator: Dixon, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Job scheduling in a heterogenous grid environment

Description: Computational grids have the potential for solving large-scale scientific problems using heterogeneous and geographically distributed resources. However, a number of major technical hurdles must be overcome before this potential can be realized. One problem that is critical to effective utilization of computational grids is the efficient scheduling of jobs. This work addresses this problem by describing and evaluating a grid scheduling architecture and three job migration algorithms. The archit… more
Date: February 11, 2004
Creator: Oliker, Leonid; Biswas, Rupak; Shan, Hongzhang & Smith, Warren
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulation Analysis of Inspections of International Travelers at Los Angeles International Airport for US-VISIT

Description: The United States Visitor and Immigrant Status Indicator Technology Program (US-VISIT) will deploy biometric and other systems to identify and track foreign nationals entering and exiting the U.S. Evaluation of the large number of possible policy options and technical configurations for implementation of US-VISIT requires validated system analyses with appropriate tools that can address the requirements of this new program and its processes. Early identification of performance issues and capabi… more
Date: February 11, 2004
Creator: Edmunds, T.; Sholl, P.; Yao, Y.; Gansemer, J.; Cantwell, E.; Prosnitz, D. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Rapporteurs' Report

Description: This Third FSC workshop focused on, ''Understanding the factors that influence public perception and confidence in the area of radioactive waste management...'' The workshop was held in Finland in close cooperation with Finnish stakeholders. This was most appropriate because of the recent successes in achieving positive decisions at the municipal, governmental, and Parliamentary levels, allowing the Finnish high-level radioactive waste repository program to proceed, including the identification… more
Date: February 11, 2004
Creator: Isaacs, T H
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeling and characterization of recompressed damaged materials

Description: Experiments have been performed to explore conditions under which spall damage is recompressed with the ultimate goal of developing a predictive model. Spall is introduced through traditional gas gun techniques or with laser ablation. Recompression techniques producing a uniaxial stress state, such as a Hopkinson bar, do not create sufficient confinement to close the porosity. Higher stress triaxialities achieved through a gas gun or laser recompression can close the spall. Characterization of … more
Date: February 11, 2004
Creator: Becker, R.; Cazamias, J. U.; Kalantar, D. H.; LeBlanc, M. M. & Springer, H. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CREME: Cis-Regulatory Module Explorer for the Human Genome

Description: The binding of transcription factors to specific regulatory sequence elements is a primary mechanism for controlling gene transcription. Eukaryotic genes are often regulated by several transcription factors, whose binding sites are tightly clustered and form cis-regulatory modules. In this paper we present a web-server, CREME, for identifying and visualizing cis-regulatory modules in the promoter regions of a given set of potentially co-regulated genes. CREME relies on a database of putative tr… more
Date: February 11, 2004
Creator: Loots, G G; Sharan, R; Ovcharenko, I & Ben-Hur, A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Metastability and Delta-Phase Retention in Plutonium Alloys Final Report of LDRD Project 01-ERD-029

Description: The {delta} to {alpha}' phase transformation in Pu-Ga alloys is intriguing for both scientific and technological reasons. On cooling, the ductile fcc {delta}-phase transforms martensitically to the brittle monoclinic {alpha}'-phase at approximately -120 C (depending on composition). This exothermic transformation involves a 20% volume contraction and a significant increase in resistivity. The reversion of {alpha}' to {delta} involves a large temperature hysteresis beginning just above room temp… more
Date: February 11, 2004
Creator: Wong, J; Schwartz, A J; Blobaum, K M; Krenn, C R; Wall, M A; Wolfer, W G et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SPEIR: A Ge Compton Camera

Description: The SPEctroscopic Imager for {gamma}-Rays (SPEIR) is a new concept of a compact {gamma}-ray imaging system of high efficiency and spectroscopic resolution with a 4-{pi} field-of-view. The system behind this concept employs double-sided segmented planar Ge detectors accompanied by the use of list-mode photon reconstruction methods to create a sensitive, compact Compton scatter camera.
Date: February 11, 2004
Creator: Mihailescu, L; Vetter, K M; Burks, M T; Hull, E L & Craig, W W
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiation Detection Field Test at the Federal Express (FedEx) Air Cargo Facility at Denver International Airport (DIA)

Description: Lawrence Livermore National Laboratory (LLNL) recently conducted a field-test of radiation detection and identification equipment at the air cargo facility of Federal Express (FedEx) located at Denver International Airport (DIA) over a period of two weeks. Comprehensive background measurements were performed and were analyzed, and a trial strategy for detection and identification of parcels displaying radioactivity was implemented to aid in future development of a comprehensive protection plan.… more
Date: February 11, 2004
Creator: Weirup, D.; Waters, A.; Hall, H.; Dougan, A.; Trombino, D.; Mattesich, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Atomic scale structure of the 5-fold surface of an AlPdMn quasicrystal: A quantitative X-Ray photoelectron diffraction analysis

Description: The atomic scale structure of the 5-fold symmetric surface of an AlPdMn quasicrystal is investigated quantitatively by comparing x-ray photoelectron diffraction (XPD) simulations to experiment. The observed 5-fold symmetry of the diffraction patterns indicates that the surface is quasicrystalline with no hint of a reconstruction from the bulk structure. In analyzing the experimental data, many possible bulk terminations have been tested. Those few that fit best to the data have in common that t… more
Date: February 11, 2004
Creator: Zheng, Jin-Cheng; Huan, C. H. A.; Wee, A. T. S.; Van Hove, M. A.; Fadley, C. S.; Shi, F. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Macro and Micro Remote Viewing of Objects in Sealed Gloveboxes

Description: The Savannah River Site uses sophisticated glovebox facilities to process and analyze material that is radiologically contaminated or that must be protected from contamination by atmospheric gases. The analysis can be visual, non destructive measurement, or destructive measurement, and allows for the gathering of information that would otherwise not be obtainable. Macro and Micro systems that cover a range of 2X to 400X magnifications with a robust system compatible with the harsh glovebox envi… more
Date: February 11, 2004
Creator: Heckendorn, F.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen