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Active chatter control in a milling machine

Description: The use of active feedback compensation to mitigate cutting instabilities in an advanced milling machine is discussed in this paper. A linear structural model delineating dynamics significant to the onset of cutting instabilities was combined with a nonlinear cutting model to form a dynamic depiction of an existing milling machine. The model was validated with experimental data. Modifications made to an existing machine model were used to predict alterations in dynamics due to the integration o… more
Date: August 1, 1997
Creator: Dohner, J. L.; Hinnerichs, T. D. & Lauffer, J. P.
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Partner: UNT Libraries Government Documents Department
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A directory service for configuring high-performance distributed computations

Description: High-performance execution in distributed computing environments often requires careful selection and configuration not only of computers, networks, and other resources but also of the protocols and algorithms used by applications. Selection and configuration in turn require access to accurate, up-to-date information on the structure and state of available resources. Unfortunately, no standard mechanism exists for organizing or accessing such information. Consequently, different tools and appli… more
Date: August 1, 1997
Creator: Fitzgerald, S.; Kesselman, C. & Foster, I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Hot-isostatic pressing of U-10Zr by grain boundary diffusion and creep cavitation. Part 2: Theory and data analysis

Description: Uranium-10 wt % zirconium (U-10Zr) is a fuel alloy that has been used in the Experimental Breeder Reactor-II (EBR-II). The high burnup that was desired in this fuel system made high demands on the mechanical compatibility between fuel and cladding both during normal operation and during safety-related transients when rapid differential expansion may cause high stresses. In general, this mechanical stress can be reduced by cladding deformation if the cladding is sufficiently ductile at high burn… more
Date: August 1, 1997
Creator: McDeavitt, S.M. & Solomon, A.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Concepts for a slow-positron target at the advanced photon source

Description: The Advanced Photon Source (APS) linear accelerator beam could be used to produce slow positrons during the hours between the storage ring injection cycles. Initial concepts for the design of a target that is optimized for slow-positron production are discussed, and simulation results are presented. Some possible ways to increase the nominal linac beam power for improved slow-positron production are also discussed.
Date: August 1, 1997
Creator: Lessner, E. & White, M.
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Partner: UNT Libraries Government Documents Department
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Production of radionuclides and their migration in groundwater: a Fermilab case history model

Description: Particle accelerators that are buried underground like those at Fermilab create a condition where soil can be activated. Naturally percolating groundwater becomes contaminated by leaching out some of the radioactivity as it migrates through the soil to the underlying aquifer. The Fermilab Concentration Model was formulated to account for and combine the fundamental processes of production, leaching, and migration. Its general features are described, then site-specific data from one of the targe… more
Date: August 1, 1997
Creator: Malensek, Anthony J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Flat beams in a 50 TeV hadron collider

Description: The basic beam dynamics of a next generation 50 x 50 TeV hadron collider based on a high field magnet approach have been outlined over the past several years. Radiation damping not only produces small emittances, but also flat beams, just as in electron machines. Based on {open_quotes}Snowmass 96{close_quotes} parameters, we investigate the issues associated with flat beams in very high energy hadron colliders.
Date: August 1, 1997
Creator: Peggs, S.; Harrison, M.; Pilat, F. & Syphers, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Point defect concentrations and solid solution hardening in NiAl with Fe additions

Description: The solid solution hardening behavior exhibited when Fe is added to NiAl is investigated. This is an interesting problem to consider since the ternary Fe additions may choose to occupy either the Ni or the Al sublattice, affecting the hardness at differing rates. Moreover, the addition of Fe may affect the concentrations of other point defects such as vacancies and Ni anti-sites. As a result, unusual effects ranging from rapid hardening to solid solution softening are observed. Alloys with vary… more
Date: August 1, 1997
Creator: Pike, L.M.; Chang, Y.A. & Liu, C.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Chemical Weapons Convention -- Legal issues

Description: The Chemical Weapons Convention (CWC) offers a unique challenge to the US system of constitutional law. Its promise of eliminating what is the most purely genocidal type of weapon from the world`s arsenals as well as of destroying the facilities for producing these weapons, brings with it a set of novel legal issues. The reservations about the CWC expressed by US business people are rooted in concern about safeguarding confidential business information and protecting the constitutional right to… more
Date: August 1, 1997
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Neutron spectrum adjustment using reaction rate data acquired with a liquid dosimetry system

Description: A dosimetry technique based on neutron activation of circulating water with dissolved salts is discussed. The neutron source was the FNS accelerator at JAERI, Tokai, Japan. Yttrium chloride hexahydrate (YCl{sub 3{center_dot}}6H{sub 2}O) was the salt (264.9 grams dissolved in 16.094 liters of water). Gamma-ray yields were measured with an intrinsic Ge detector. The following reactions were examined: (1) {sup 16}O(n,p){sup 16}N (E{sub thresh} = 10.245 MeV, t{sub 1/2} = 7.13 sec, E{sub {gamma}} = … more
Date: August 1, 1997
Creator: Smith, D. L.; Ikeda, Y.; Uno, Y. & Maekawa, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Baseline monitoring and simulated liquid release test report for Tank W-9, Oak Ridge National Laboratory, Oak Ridge, Tennessee

Description: This document provides the Environmental Restoration Program with the baseline dry well conductivity monitoring data and simulated liquid release tests to support the use of Gunite and Associated Tank (GAAT) W-9 as a temporary consolidation tank during waste removal operations. Information provided in this report forms part of the technical basis for criticality safety, systems safety, engineering design and waste management as they apply to the GAAT treatability study and waste removal actions. more
Date: August 1, 1997
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advanced micromechanisms in a multi-level polysilicon technology

Description: Quad-level polysilicon surface micromachining technology, comprising three mechanical levels plus an electrical interconnect layer, is giving rise to a new generation of micro-electromechanical devices and assemblies. Enhanced components can not be produced through greater flexibility in fabrication and design. New levels of design complexity that include multi-level gears, single-attempt locks, and optical elements have recently been realized. Extensive utilization of the fourth layer of polys… more
Date: August 1, 1997
Creator: Rodgers, M. S.; Sniegowski, J. J.; Miller, S. L.; Barron, C. C. & McWhorter, P. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Increasing the productivity of biomass plantations of Populus species and hybrids in the Pacific Northwest. Final report, September 14, 1981--December 31, 1996

Description: This final report represents the culmination of eight years of biological research devoted to increasing the productivity of short rotation plantations of Populus trichocarpa and Populus hybrids in the Pacific Northwest. Studies described herein provide an understanding of tree growth, stand development and biomass yield at various spacings, and how patterns thereof differ by Populus clone in monoclonal and polyclonal plantings. Also included is some information about factors related to wind da… more
Date: August 1, 1997
Creator: DeBell, Dean S.; Harrington, Constance A.; Clendenen, Gary W.; Radwan, M. A. & Zasada, John C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final report of the environmental measurement-while-drilling-gamma ray spectrometer system technology demonstration at the Savannah River Site F-Area Retention Basin

Description: The environmental measurement-while-drilling-gamma ray spectrometer (EMWD-GRS) system represents an innovative blend of new and existing technology that provides real-time environmental and drill bit data during drilling operations. The EMWD-GRS technology was demonstrated at Savannah River Site F-Area Retention Basin. The EMWD-GRS technology demonstration consisted of continuously monitoring for gamma-radiation-producing contamination while drilling two horizontal boreholes below the backfille… more
Date: August 1, 1997
Creator: Lockwood, G. J.; Normann, R. A. & Williams, C. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulations of the LEDA LEBT H{sup +} beam

Description: The computer codes TRACE and SCHAR model the Low-Energy Demonstration Accelerator (LEDA) Low-Energy Beam Transport (LEBT) for 75-keV, 110-mA, dc H{sup +} beams. Solenoid-lens location studies verify that the proposed LEBT design gives a near-optimum match to the LEDA RFQ. The desired RFQ transmission ({ge} 90%) and output emittance ({le} 0.22 {pi} mm mrad, transverse) are obtained when PARMTEQM transports the file for the SCHAR-generated optimum beam through the RFQ.
Date: August 1, 1997
Creator: Smith, H. V. Jr.; Sherman, J. D.; Stevens, R. R. Jr. & Young, L. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radionuclide air emissions. Annual report for calendar year 1997

Description: A description is provided of radioactive effluent releases from the Pinellas Plant. The DOE sold the Pinellas Plant in March 1995. A portion of the plant was backed by DOE until September 1997 to facilitate a safe transition to commercial ventures.The plant`s radiological processing equipment was cleaned from past DOE operations. Emissions from the cleanup activity were monitored.
Date: August 1, 1997
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Validating theoretical calculations of thermomechanical stress and deformation using the ATC4.1 flip-chip test vehicle

Description: Two closed form analytical solutions for tri-material thermomechanical stress and deformation, along with one-quarter section finite element model (FEM), were validated using an in-situ CMOS piezoresistive stress measurement test chip that has been repatterened into a fine pitch area array flip-chip. A special printed circuit board substrate for the test chip was designed at Sandia and fabricated by the Hadco Corp. The flip-chip solder attach (FCA) and underfill was performed by a SEMATECH memb… more
Date: August 1, 1997
Creator: Peterson, D.W.; Sweet, J.N. & Burchett, S.N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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RISKIND verification and benchmark comparisons

Description: This report presents verification calculations and benchmark comparisons for RISKIND, a computer code designed to estimate potential radiological consequences and health risks to individuals and the population from exposures associated with the transportation of spent nuclear fuel and other radioactive materials. Spreadsheet calculations were performed to verify the proper operation of the major options and calculational steps in RISKIND. The program is unique in that it combines a variety of w… more
Date: August 1, 1997
Creator: Biwer, B. M.; Arnish, J. J.; Chen, S. Y. & Kamboj, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of global medium-energy nucleon-nucleus optical model potentials

Description: The authors report on the development of new global optical model potentials for nucleon-nucleus scattering at medium energies. Using both Schroedinger and Dirac scattering formalisms, the goal is to construct a physically realistic optical potential describing nucleon-nucleus elastic scattering observables for a projectile energy range of (perhaps) 20 meV to (perhaps) 2 GeV and a target mass range of 16 to 209, excluding regions of strong nuclear deformation. They use a phenomenological approa… more
Date: August 1, 1997
Creator: Madland, D.G. & Sierk, A.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evaluation of calendar year 1996 groundwater and surface water quality data for the Chesnut Ridge Hydrogeologic Regime at the US Department of Energy Y-12 Plant, Oak Ridge, Tennessee

Description: This report presents an evaluation of the groundwater monitoring data obtained in the Chesnut Ridge Hydrogeologic Regime (Chesnut Ridge Regime) during calendar year (CY) 1996. The Chesnut Ridge Regime encompasses a section of Chesnut Ridge bordered by the US Department of Energy (DOE) Y-12 Plant in Bear Creek Valley (BCV) to the north, Scarboro Road to the east, Bethel Valley Road to the south, and an unnamed drainage basin southwest of the Y-12 Plant. Groundwater quality monitoring is performe… more
Date: August 1, 1997
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selection of sites for monitoring network performance (extended abstract)

Description: The authors apply the ideas from optimal design theory to the very specific area of monitoring large computer networks. The behavior of these networks is so complex and uncertain that it is quite natural to use the statistical methods of experimental design developed for situations in which the random character of phenomena is a crucial component and systems are too complicated to be described by any reasonable deterministic model. The authors want to emphasize that only the first steps have be… more
Date: August 1, 1997
Creator: Fedorov, V.; Flanagan, D. & Batsell, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Magnetoresistance peak in the mixed state of the organic superconductor {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br

Description: In this letter, the authors report transport measurements with field and current parallel to the b axis (perpendicular to the conducting plane) in the organic superconductor {kappa}-(BEDT-TTF){sub 2}Cu[N(CN){sub 2}]Br. The isothermal magnetoresistance R(H) displays a peak effect as a function of field. The peak resistance is substantially larger than that in large fields. The results are in sharp contrast to the conventional dissipation mechanisms in the mixed state of anisotropic superconducto… more
Date: August 1, 1997
Creator: Zuo, F.; Schlueter, J. A. & Williams, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On predicting the transition to turbulence in stably stratified fluids

Description: The development of turbulence in stratified fluids has historically been studied using the flux, Ri{sub f}, and the gradient Richardson no., Ri, whereas the simpler shear flow transition in homogeneous fluids has been studied using the Reynolds no. A complete dimensional analysis dimensional analysis of the relevant linearized conservation equations in the Boussinesq approximation predicts that the physical processes in stably stratified boundary layers should depend on as many as five dimensio… more
Date: August 1, 1997
Creator: ReVelle, D. O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Stainless Steel RSM Beneficial Reuse technical feasibility to business reality

Description: The Stainless Steel Beneficial Reuse Program began in 1994 as a demonstration funded by the DOE Office of Science and Technology. The purpose was to assess the practicality of stainless steel radioactive scrap metal (RSM) recycle. Technical feasibility has been demonstrated through the production of a number of products made from recycled RSM. A solid business foundation is yet to be achieved. However, a business environment is beginning to develop as multiple markets and applications for RSM a… more
Date: August 1, 1997
Creator: Boettinger, W.L. & Mishra, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analysis of individual lipoproteins and liposomes

Description: We describe the application of single molecule detection (SMD) technologies for the analysis of natural (serum lipoproteins) and synthetic (liposomes) transport systems. The need for advanced analytical procedures of these complex and important systems is presented with the specific enhancements afforded by SMD with flowing sample streams. In contrast to bulk measurements which yield only average values, measurement of individual species allows creation of population histograms from heterogeneo… more
Date: August 1, 1997
Creator: Robbins, D.L.; Keller, R.A. & Nolan, J.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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