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Elastic Wave Radiation from a Pressurized Spherical Cavity
None
Date:
July 1, 2002
Creator:
ALDRIDGE, DAVID F.
Object Type:
Report
System:
The UNT Digital Library
Fast Grid Search Algorithm for Seismic Source Location
The spatial and temporal origin of a seismic energy source are estimated with a first grid search technique. This approach has greater likelihood of finding the global rninirnum of the arrival time misiit function compared with conventional linearized iterative methods. Assumption of a homogeneous and isotropic seismic velocity model allows for extremely rapid computation of predicted arrival times, but probably limits application of the method to certain geologic environments and/or recording geometries. Contour plots of the arrival time misfit function in the vicinity of the global minimum are extremely useful for (i) quantizing the uncertainty of an estimated hypocenter solution and (ii) analyzing the resolving power of a given recording configuration. In particular, simultaneous inversion of both P-wave and S-wave arrival times appears to yield a superior solution in the sense of being more precisely localized in space and time. Future research with this algorithm may involve (i) investigating the utility of nonuniform residual weighting schemes, (ii) incorporating linear and/or layered velocity models into the calculation of predicted arrival times, and (iii) applying it toward rational design of microseismic monitoring networks.
Date:
July 1, 2000
Creator:
ALDRIDGE,DAVID F.
Object Type:
Report
System:
The UNT Digital Library
STATUS OF THE EBIS PROJECT AT BROOKHAVEN.
None
Date:
August 21, 2006
Creator:
ALESSI, J.; BARTON, D.; BEEBE, E. & AL., ET
Object Type:
Article
System:
The UNT Digital Library
ELECTRON BEAM ION SOURCE PREINJECTOR PROJECT (EBIS) CONCEPTUAL DESIGN REPORT.
This report describes a new heavy ion pre-injector for the Relativistic Heavy Ion Collider (RHIC) based on a high charge state Electron Beam Ion Source (EBIS), a Radio Frequency Quadrupole (RFQ) accelerator, and a short Linac. The highly successful development of an EBIS at BNL now makes it possible to replace the present pre-injector that is based on an electrostatic Tandem with a reliable, low maintenance Linac-based pre-injector. Linac-based pre-injectors are presently used at most accelerator and collider facilities with the exception of RHIC, where the required gold beam intensities could only be met with a Tandem until the recent EBIS development. EBIS produces high charge state ions directly, eliminating the need for the two stripping foils presently used with the Tandem. Unstable stripping efficiencies of these foils are a significant source of luminosity degradation in RHIC. The high reliability and flexibility of the new Linac-based pre-injector will lead to increased integrated luminosity at RHIC and is an essential component for the long-term success of the RHIC facility. This new pre-injector, based on an EBIS, also has the potential for significant future intensity increases and can produce heavy ion beams of all species including uranium beams and, as part of …
Date:
February 28, 2005
Creator:
ALESSI, J.; BARTON, D.; BEEBE, E.; GASSNER, D. & AL., ET
Object Type:
Report
System:
The UNT Digital Library
HIGH-INTENSITY, HIGH CHARGE-STATE HEAVY ION SOURCES
There are many accelerator applications for high intensity heavy ion sources, with recent needs including dc beams for RIA, and pulsed beams for injection into synchrotrons such as RHIC and LHC. The present status of sources producing high currents of high charge state heavy ions is reviewed. These sources include ECR, EBIS, and Laser ion sources. Benefits and limitations for these type sources are described. Possible future improvements in these sources are also mentioned.
Date:
August 16, 2004
Creator:
ALESSI,J. G.
Object Type:
Article
System:
The UNT Digital Library
An Order-of-Magnitude Estimation of Benzene Concentration in Saltstone Vault
The contents of Tank 48 that include the tetraphenylborate (TPB) precipitates of potassium and cesium will be grouted and stored in the Saltstone vault. The grouting process is exothermic, which should accelerate the decomposition of TPB precipitates eventually to benzene. Because the vault is not currently outfitted with an active ventilation system, there is a concern that a mixture of flammable gases may form in the vapor space of each cell filled with the curing grout. The purpose of this study was to determine if passive breathing induced by the diurnal oscillations of atmospheric pressure would provide any mitigating measure against potential flammability. Specifically, it was requested that a set of algorithms be developed that would predict the equilibrium concentration of benzene as a function of benzene generation rate, fill height, and the amplitude of the barometric pressure oscillations. These algorithms were to be derived based on several simplifying assumptions so that order of magnitude estimates could be made quickly for scoping purposes. This memo documents the resulting algorithms along with those key assumptions made. These algorithms were then applied to simulate several test cases, including the baseline case where the cell was filled to the maximum height of 25 …
Date:
February 28, 2005
Creator:
ALEXANDER, CHOI
Object Type:
Report
System:
The UNT Digital Library
SPALL STUDIES IN COPPER FOILS USING THE LASER-DRIVEN MINIFLYER
None
Date:
September 1, 2000
Creator:
ALEXANDER, D. J.; ROBBINS, D. L. & SHEFFIELD, S. A.
Object Type:
Article
System:
The UNT Digital Library
AN APPROACH TO EXTREME-SCALE SIMULATION OF NOVEL ARCHITECTURES
None
Date:
July 1, 2001
Creator:
ALEXANDER, F. J.; BERKBIGLER, K. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Frequency Doubling Broadband Light in Multiple Crystals
The authors compare frequency doubling of broadband light in a single nonlinear crystal with doubling in five crystals with intercrystal temporal walk off compensation, and with doubling in five crystals adjusted for offset phase matching frequencies. Using a plane-wave, dispersive numerical model of frequency doubling they study the bandwidth of the second harmonic and the conversion efficiency as functions of crystal length and fundamental irradiance. For low irradiance the offset phase matching arrangement has lower efficiency than a single crystal of the same total length but gives a broader second harmonic bandwidth. The walk off compensated arrangement gives both higher conversion efficiency and broader bandwidth than a single crystal. At high irradiance, both multicrystal arrangements improve on the single crystal efficiency while maintaining broad bandwidth.
Date:
July 26, 2000
Creator:
ALFORD,WILLIAM J. & SMITH,ARLEE V.
Object Type:
Article
System:
The UNT Digital Library
Testing Miller Wavelength Scaling of the Second-Order Nonlinear Coefficients of KNbO{sub 3}, KTiOPO{sub 4}, KTiOAsO{sub 4}, LiNbO{sub 3}, LiIO{sub 3}, B-BaB{sub 2}O{sub 4}, KH{sub 2}OP{sub 4}, and LiB{sub 3}O{sub 5}
None
Date:
October 20, 2000
Creator:
ALFORD,WILLIAM J. & SMITH,ARLEE V.
Object Type:
Article
System:
The UNT Digital Library
Wavelength Variation of the Second-Order Nonlinear Coefficients of KNbO3, KTiOPO4, KTiOAsO4, LiNbO3, LiIO3, B-BaB2O4, KH2PO4, and LiB3O5 Crystals: A Test of Miller Wavelength Scaling
None
Date:
July 17, 2000
Creator:
ALFORD,WILLIAM J. & SMITH,ARLEE V.
Object Type:
Article
System:
The UNT Digital Library
Alignment validation
The four experiments, ALICE, ATLAS, CMS and LHCb are currently under constructionat CERN. They will study the products of proton-proton collisions at the Large Hadron Collider. All experiments are equipped with sophisticated tracking systems, unprecedented in size and complexity. Full exploitation of both the inner detector andthe muon system requires an accurate alignment of all detector elements. Alignmentinformation is deduced from dedicated hardware alignment systems and the reconstruction of charged particles. However, the system is degenerate which means the data is insufficient to constrain all alignment degrees of freedom, so the techniques are prone to converging on wrong geometries. This deficiency necessitates validation and monitoring of the alignment. An exhaustive discussion of means to validate is subject to this document, including examples and plans from all four LHC experiments, as well as other high energy experiments.
Date:
September 6, 2008
Creator:
ALICE; ATLAS; CMS; LHCb & Golling, Tobias
Object Type:
Article
System:
The UNT Digital Library
INVESTIGATION OF HALO FORMATION IN CONTINUOUS BEAMS USING WEIGHTED POLYNOMIAL EXPANSIONS AND PERTURBATIONAL ANALYSIS
We consider halo formation in continuous beams oscillating at natural modes by inspecting particle trajectories. Trajectory equations containing field nonlinearities are derived from a weighted polynomial expansion. We then use perturbational techniques to further analyze particle motion.
Date:
August 1, 2000
Creator:
ALLEN, C.
Object Type:
Article
System:
The UNT Digital Library
Editing Tips for Technical Publications in the Joint Nuclear Weapons Publication System (JNWPS)
These editing tips contain helpful suggestions to assist writers who are writing, editing, and publishing technical publications in the JNWPS. The suggestions clarify some of the most common writing problems and requirements of two publications used in the JNWPS: ''DOE-DTRA TP 1-1, Joint Nuclear Weapons Publications System Operating Procedures, Specifications, and Standards, and United States Government Printing Office Style Manual''. Topics include requirements for abbreviations, formats for drafts, layouts of illustrations and tables, appropriate wording for interim changes, guidance for creating a list of effective pages, how to insert and delete pages and paragraphs, referencing other technical publications, use of revision bars, requirements for safety precautions, use of hyphens, and how to place warnings, cautions, and notes. Also included are a writer's checklist, samples of draft title pages, and a section of helpful tips for the writers who use the department's desktop publishing software program, Adobe{reg_sign} FrameMaker{reg_sign}.
Date:
December 1, 2002
Creator:
ALLEN, TARA S.
Object Type:
Report
System:
The UNT Digital Library
HYBRIDIZATION AND PRESSURE EFFECTS IN UTX COMPOUNDS
None
Date:
October 1, 2001
Creator:
ALSAMDI, A.; SECHOVSKY, V. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
International Workshop on Approaches for Upscaling Processes Affecting Radionuclide Transport through the Subsurface
None
Date:
August 28, 2000
Creator:
ALTMAN,SUSAN J.
Object Type:
Article
System:
The UNT Digital Library
Cooperative Monitoring Center Occasional Paper/16: The Potential of Technology for the Control of Small Weapons: Applications in Developing Countries
For improving the control of small arms, technology provides many possibilities. Present and future technical means are described in several areas. With the help of sensors deployed on the ground or on board aircraft, larger areas can be monitored. Using tags, seals, and locks, important objects and installations can be safeguarded better. With modern data processing and communication systems, more information can be available, and it can be more speedily processed. Together with navigation and transport equipment, action can be taken faster and at greater range. Particular considerations are presented for cargo control at roads, seaports, and airports, for monitoring designated lines, and for the control of legal arms. By starting at a modest level, costs can be kept low, which would aid developing countries. From the menu of technologies available, systems need to be designed for the intended application and with an understanding of the local conditions. It is recommended that states start with short-term steps, such as acquiring more and better radio transceivers, vehicles, small aircraft, and personal computers. For the medium term, states should begin with experiments and field testing of technologies such as tags, sensors, and digital communication equipment.
Date:
July 1, 2000
Creator:
ALTMANN, JURGEN
Object Type:
Report
System:
The UNT Digital Library
Methodology for characterizing modeling and discretization uncertainties in computational simulation
This research effort focuses on methodology for quantifying the effects of model uncertainty and discretization error on computational modeling and simulation. The work is directed towards developing methodologies which treat model form assumptions within an overall framework for uncertainty quantification, for the purpose of developing estimates of total prediction uncertainty. The present effort consists of work in three areas: framework development for sources of uncertainty and error in the modeling and simulation process which impact model structure; model uncertainty assessment and propagation through Bayesian inference methods; and discretization error estimation within the context of non-deterministic analysis.
Date:
March 1, 2000
Creator:
ALVIN,KENNETH F.; OBERKAMPF,WILLIAM L.; RUTHERFORD,BRIAN M. & DIEGERT,KATHLEEN V.
Object Type:
Report
System:
The UNT Digital Library
Development of An On-Line, Core Power Distribution Monitoring System
The objective of the proposed work was to develop a software package that can construct in three-dimensional core power distributions using the signals from constant temperature power sensors distributed in the reactor core. The software developed uses a mode-based state/parameter estmation technique that is particularly attractive when there are model uncertainties and/or large signal noise. The software yields the expected value of local power at the detector locations and points in between, as well as the probability distribution of the local power density
Date:
October 2, 2007
Creator:
ALdemir, Tunc; Miller, Don & Wang, Peng
Object Type:
Report
System:
The UNT Digital Library
INTERNATIONAL ENGLISH MANUAL
This document presents a set of guidelines for authors who wish to express themselves more clearly to foreign readers, or readers whose first language is not American English. Topics include idioms, technical terms, jargon, word meaning, acronyms, and international conventions of measurement. The guidelines will help writers of technical documents present their ideas more effectively to audiences that may include individuals whose first language is not American English, including audiences with individuals from other English-speaking countries.
Date:
February 22, 2002
Creator:
AMADOR, MABLE & KELLER, YVONNE KELLER
Object Type:
Report
System:
The UNT Digital Library
Cloud to CAD
This paper documents work performed to convert scanned range data to CAD solid model representation. The work successfully developed surface fitting algorithms for quadric surfaces (e.g. plane, cone, cylinder, and sphere), and a segmentation algorithm based entirely on surface type, rather than on a differential metric like Gaussian curvature. Extraction of all CAD-required parameters for quadric surface representation was completed. Approximate face boundaries derived from the original point cloud were constructed. Work to extrapolate surfaces, compute exact edges and solid connectivity was begun, but left incomplete due to funding reductions. The surface fitting algorithms are robust in the face of noise and degenerate surface forms.
Date:
May 1, 2001
Creator:
AMES,ARLO L.
Object Type:
Report
System:
The UNT Digital Library
Use of inelastic analysis in cask design
In this paper, the advantages and disadvantages of inelastic analysis are discussed. Example calculations and designs showing the implications and significance of factors affecting inelastic analysis are given. From the results described in this paper it can be seen that inelastic analysis provides an improved method for the design of casks. It can also be seen that additional code and standards work is needed to give designers guidance in the use of inelastic analysis. Development of these codes and standards is an area where there is a definite need for additional work. The authors hope that this paper will help to define the areas where that need is most acute.
Date:
May 15, 2000
Creator:
AMMERMAN,DOUGLAS J. & BREIVIK,NICOLE L.
Object Type:
Article
System:
The UNT Digital Library
A PREDICTIVE MODEL OF NUCLEON-NUCLEUS SCATTERING CROSS SECTIONS
None
Date:
August 1, 2001
Creator:
AMOS, K.; DEB, P. & KARATAGLIDIS, S.
Object Type:
Article
System:
The UNT Digital Library
Interim Measures to Limit the Migration of Radioactive Contaminants through the Vadose Zone at Hanford Single Shell Tank (SST) Farms
None
Date:
December 1, 2000
Creator:
ANDERSON, F.J.
Object Type:
Article
System:
The UNT Digital Library