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Winter Fuels Report
14
LLE Review Quarterly Report
11
Fiscal Year 1994
10
Field Study of Disposed Solid Wastes From Advanced Coal Processes Progress Report
9
Fiscal Year 1995
9
Fiscal Year 2000
8
Fiscal Year 2005
7
Science & Technology Review
7
Chemical Processing Department Monthly Report
6
Fiscal Year 1998
6
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29,260 Matching Results
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Dedicated medical ion accelerator design study. Final report
Results and conclusions are reported from a design study for a dedicated medical accelerator. Basing efforts on the current consensus regarding medical requirements, the resulting demands on accelerator and beam delivery systems were analyzed, and existing accelerator technology was reviewed to evaluate the feasibility of meeting these demands. This general analysis was augmented and verified by preparing detailed preliminary designs for sources of therapeutic beams of neutrons, protons and heavy ions. The study indicates that circular accelerators are the most desirable and economical solutions for such sources. Synchrotrons are clearly superior for beams of helium and heavier ions, while synchrotrons and cyclotrons seem equally well suited for protons although they have different strengths and weaknesses. Advanced techniques of beam delivery are of utmost importance in fully utilizing the advantages of particle beams. Several issues are invloved here. First, multi-treatment room arrangements are essential for making optimal use of the high dose rate capabilities of ion accelerators. The design of corresponding beam switching systems, the principles of which are already developed for physics experimental areas, pose no problems. Second, isocentric beam delivery substantially enhances flexibility of dose delivery. After several designs for such devices were completed, it was concluded that high …
Date:
December 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Elastic properties of monoclinic hafnium oxide
The elastic properties of monoclinic hafnium oxide were studied as functions of porosity, temperature and grain size. An important finding of this study was that hafnium oxide is subject to microcracking when the grain size exceeds a critical value between 2 and 3 mu m. The behavior of the elastic moduli with porosity and temperature for crack-free hafnium oxide was typical for polycrystalline ceramics. The nature of the thermal expansion and the internal friction supported this finding. The elastic properties for the microcracked material exhibited trends similar to those observed for other microcracked materials. However, some new characteristics of the microcracking effects were observed in this study. An increase in internal friction was associated with the microcrack healing process. It was also found that there is an atmospheric effect that enhances microcrack growth. Additionally, thermal treatments of microcracked hafnium oxide were found to result in significant changes in the microcrack system.
Date:
December 1, 1977
Creator:
Dole, S.L.
Object Type:
Report
System:
The UNT Digital Library
Universal formula for the quasistatic second-order density perturbation by a cold magnetoplasma wave
Using the general expression for the ponderomotive Hamiltonian, the quasi-static quasi-neutral density change caused by the ponderomotive force of a cold magnetoplasma wave of arbitrary frequency and polarization is obtained. This formula agrees with and extends previous results for unmagnetized and magnetized plasma.
Date:
December 16, 1977
Creator:
Kaufman, A. N.; Cary, J. R. & Pereira, N. R.
Object Type:
Article
System:
The UNT Digital Library
Novel duplex vapor-electrochemical method for silicon solar cells. Quarterly progress report No. 7, August 1, 1977--October 31, 1977
Silicon obtained by the SiF/sub 4/-Na reaction was analyzed by spark source mass spectrometry (SSMS). A partial listing of the results is given below. The concentration units in parentheses are ppM wt. B(0.1), Al(0.8), Ga(0.06), P(0.2), F(0.1), Na(1.0), V(0.04), Mo(0.3), Ti(2.0), Zr(2.0), Mn(0.1), Ni(2.0), Zn(0.01), Cu(20.0), Cr(11.0), Fe(55.0). An excellent starting material for silicon solar cells is obtained on the basis of the low levels of B, Al, Ga, P and As. The source of the Fe and Cr is suspected to be the stainless steel container for liquid sodium. An independent check for the phosphorus content in Sample 2-19 was made by a wet colorimetric method and was found to be 90 parts per billion (ppB), in reasonable agreement with the SSMS result of 20 ppB. Silicon samples prepared from induction melted powder were evaluated for electrical properties using four-point probe conductivity and thermoelectric methods. The solid silicon in Sample 2-19 was found to be p-type and ranged in resistivity between 0.1 and 0.5 ohm cm. A stainless steel reactor was designed and fabricated to perform the SiF/sub 4/-Na reaction under P/sub SiF/sub 4// greater than 1 atmosphere. The amount of silicon produced was increased from 25 g per …
Date:
December 1, 1977
Creator:
Kapur, V.K.; Nanis, L. & Sanjurjo, A.
Object Type:
Report
System:
The UNT Digital Library
International conference on bone mineral measurement, October 12--13, 1973, Chicago, Illinois
From international conference on bone mineral measurement; Chicago, Illinois, USA (12 Oct 1973). Abstracts of papers presented at the international conference on bone mineral measurement are presented. The papers were grouped into two sessions: a physical session including papers on measuring techniques, errors, interpretation and correlations, dual photon techniques, and data handling and exchange; a biomedical session including papers on bone disease, osteoporosis, normative data, non-disease influences, renal, and activity and inactivity. (ERB)
Date:
December 31, 1973
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Thermal performance measurements on ultimate heat sinks--cooling ponds
The primary objective of the studies described is to obtain the requisite data, with respect to modeling requirements, to characterize thermal performance of heat sinks for nuclear facilities existing at elevated water temperatures in result of experiencing a genuinely large heat load and responding to meteorological influence. The data should reflect thermal performance for combinations leading to worst-case meteorological influence. A geothermal water retention basin has been chosen as the site for the first measurement program and data have been obtained in the first of several experiments scheduled to be performed there. These data illustrate the thermal and water budgets during episodes of cooling from an initially high pond water bulk temperature. Monitoring proceeded while the pond experienced only meteorological and seepage influence. The data are discussed and are presented as a data volume which may be used for calculation purposes. Suggestions for future measurement programs are stated with the intent to maintain and improve relevance to nuclear ultimate heat sinks while continuing to examine the performance of the analog geothermal pond. It is further suggested that the geothermal pond, with some modification, may be a suitable site for spray pond measurements.
Date:
December 1, 1977
Creator:
Hadlock, R.K. & Abbey, O.B.
Object Type:
Report
System:
The UNT Digital Library
Tracking with wire chambers at high luminosities
Radiation damage and rate limitations impose severe constraints on wire chambers at the SSC. Possible conceptual designs for wire chamber tracking systems that satisfy these constraints are discussed. Computer simulation studies of tracking in such systems are presented. Simulations of events from interesting physics at the SSC, including hits from minimum bias background events, are examined. Results of some preliminary pattern recognition studies are given. 11 refs., 10 figs.
Date:
December 1, 1989
Creator:
Hanson, G. G.
Object Type:
Article
System:
The UNT Digital Library
Bose-Einstein correlations in e/sup +/e/sup -/ collisions
The MARK II detector is used to study the Bose-Einstein correlation between pairs and triplets of charged pions produced in hadronic decays of the J)psi), the ..sqrt..s = 4 to 7 GeV continuum above the J)psi), two photon events at ..sqrt..s = 29 GeV, and e/sup )plus/)e/sup )minus/) annihilation events at ..sqrt..s = 29 GeV as a function of Q/sup 2/, the four-momentum transfer squared. After corrections for Coulomb effects and pion misidentification, we find a nearly full Bose-Einstein enhancement ..cap alpha.. in the J)psi) and the two photon data and about half the maximum value in the other two data sets. The radius parameter )tau)(an average over space and time) given by pion pair analyses lies within a band of +-0.10 fm around 0.73 fm and is the same, within errors, for all four data sets. Pion triplet analyses also give a consistent radius of approx. 0.54 fm. fits to two-dimensional distributions R(q/sub T//sup 2/, q/sub C//sup 2/) of invariant components of Q/sup 2/ = q/sub T//sup 2/ )plus) q/sub C//sup 2/ give )tau)/sub T/ approx. )tau)C approx. )tau), where q/sub T/ is the transverse three-momentum difference calculated with respect to the net pair three-momentum, and q/sub C/ is …
Date:
December 1, 1987
Creator:
Juricic, I.
Object Type:
Report
System:
The UNT Digital Library
HTGR fuel recycle program. Quarterly progress report for the period ending November 30, 1977
The work reported includes the development of unit processes and equipment for reprocessing of High-Temperature Gas-Cooled Reactor (HTGR) fuel, the design and development of an integrated pilot line to demonstrate the head end of HTGR reprocessing using unirradiated fuel materials, and design work in support of Hot Engineering Tests (HET). Work is also described on trade-off studies concerning the required design of facilities and equipment for the large-scale recycle of HTGR fuels in order to guide the development activities for HTGR fuel recycle.
Date:
December 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Procedures and instructions for fabrication, assembly, and test of PCP III multisection ionization chamber (Q-2633) for reactor control
This document is a collection of procedures for fabrication, assembly, and testing of a PCP III multisection ionization chamber (Q-2633) for reactor control.
Date:
December 1, 1977
Creator:
Chiles, M. M.; Clay, W. T. & Fowler, C. E.
Object Type:
Report
System:
The UNT Digital Library
Rockwell Hanford Operations' 1978 radiological improvement program
This document describes the radiological improvement program (RIP) to be undertaken by Rockwell Hanford Operations during calendar year 1978. Actions taken in each facility to reduce exposure and to implement the Company's policy to conduct operations in a manner that assures radiation exposures to employees are maintained at the lowest levels reasonably achievable.
Date:
December 30, 1977
Creator:
Cunningham, D. S.
Object Type:
Report
System:
The UNT Digital Library
Ion cyclotron radio frequency systems and performance on the tandem mirror experiment-upgrade (TMX-U)
High power ion cyclotron radio frequency (ICRF) systems are now gaining greater attention than before as prime driver ion heating systems. Lawrence Livermore National Laboratory (LLNL) has installed a 200 kW high frequency (HF) transmitter system on its Tandem Mirror Experiment-Upgrade (TMX-U). This paper describes the system, antenna, controls, and monitoring apparatus. The transmitter operates into a high Q antenna installed in the central cell region of the experiment. It incorporates a dual-port feedback system to automatically adjust the transmitter's output power and allow the maximum consistent with the plasma loading of the antenna. Special techniques have been used to measure, in real-time, the dynamically changing loading values presented by the plasma. From the measurements, the antenna impedance can be optimized for specified plasma density.
Date:
December 1, 1983
Creator:
Moore, T. L.; Molvik, A. W.; Cummins, W. F.; Pedrotti, L. R.; Henderson, A. L.; Karsner, P. G. et al.
Object Type:
Article
System:
The UNT Digital Library
Evaluating late detection capability against diverse insider adversaries
This paper describes a model for evaluating the late (after-the-fact) detection capability of material control and accountability (MCandA) systems against insider theft or diversion of special nuclear material. Potential insider cover-up strategies to defeat activities providing detection (e.g., inventories) are addressed by the model in a tractable manner. For each potential adversary and detection activity, two probabilities are assessed and used to fit the model. The model then computes the probability of detection for activities occurring periodically over time. The model provides insight into MCandA effectiveness and helps identify areas for safeguards improvement. 4 refs., 4 tabs.
Date:
December 3, 1987
Creator:
Sicherman, A.
Object Type:
Article
System:
The UNT Digital Library
Heavy ion drivers for inertial confinement fusion
The advantages of heavy ion beams as a way of delivering the needed energy and power to an inertial fusion target are surveyed. The existing broad technology base of particle accelerators provides an important foundation for designing, costing, and evaluating proposed systems. The sequence of steps needed for the verification of the heavy ion approach is described; recent research results are even more encouraging than had been assumed hitherto.
Date:
December 1, 1983
Creator:
Keefe, D.
Object Type:
Article
System:
The UNT Digital Library
Stabilization of the axisymmetric instability in the PDX tokamak
Passive stabilization, associated with the mutual inductances of the field shaping coils with the plasma and with each other, can stabilize the axisymmetric magnetohydrodynamic instability in the Princeton Poloidal Divertor Experiment device that was observed in earlier numerical studies.
Date:
December 1, 1977
Creator:
Jardin, S. C.
Object Type:
Report
System:
The UNT Digital Library
Safeguards Material Control and Accounting Program. Quarterly report, April-June 1980
This report summarizes the April-June 1980 activities of the Safeguards Material and Accounting Program sponsored by the US Nuclear Regulatory Commission (NRC) at the Lawrence Livermore National Laboratory. Progress is described on the application and further development of computer-based methodologies for assessing the vulnerabilities of MC and A systems in nuclear fuel-cycle facilities. The application effort involved an assessment of a scrap processing facility with the Structured Assessment Approach (SAA) methodology. The development effort concentrated on making the SAA more user-oriented. Work continued in providing technical analyses to assist the NRC in its development of the forthcoming MC and A upgrade rule. The technical analyses have involved value-impact studies on the draft MC and A upgrade rule using the LLNL Aggregrated Systems Model; specifically, progress has been made on the development of five MC and A performance measures. Other work has included the development of four protection principles for protecting MC and A data from falsification. We also describe progress in analyzing the actual and potential value of an NRC interfacility material accounting system for detecting data falsification.
Date:
December 1, 1980
Creator:
Poggio, A. J. & Dunn, D. R.
Object Type:
Report
System:
The UNT Digital Library
Assessment of tritium breeding requirements for fusion power reactors
This report presents an assessment of tritium-breeding requirements for fusion power reactors. The analysis is based on an evaluation of time-dependent tritium inventories in the reactor system. The method presented can be applied to any fusion systems in operation on a steady-state mode as well as on a pulsed mode. As an example, the UWMAK-I design was analyzed and it has been found that the startup inventory requirement calculated by the present method significantly differs from those previously calculated. The effect of reactor-parameter changes on the required tritium breeding ratio is also analyzed for a variety of reactor operation scenarios.
Date:
December 1, 1983
Creator:
Jung, J.
Object Type:
Report
System:
The UNT Digital Library
Distribution of naphthalene between commercial resins and water--methanol solutions
Several XAD resins, two of their chemically modified derivatives, and two carbon absorbents were evaluated by measurement of distribution coefficients using the batch method. Numerical comparison of distribution data and graphical interpretation of these resins were also presented. The distribution differences were explained in terms of resin structure and solvent compositions. Naphthalene was the solute for the study, and methanol the solvent. It was found that Spherocarb, a newly developed carbon adsorbent, had very large distribution coefficient. However, in the application for separation, desorption can conceivably be a problem. Distribution data collected can be a valuable aid in the choice of adsorbent, solvent composition and other operating conditions in separation work.
Date:
December 1, 1977
Creator:
Chu, F.K.C.
Object Type:
Report
System:
The UNT Digital Library
Portable software for distributed readout controllers and event builders in FASTBUS and VME
We report on software developed as part of the PAN-DA system to support the functions of front end readout controllers and event builders in multiprocessor, multilevel, distributed data acquisition systems. For the next generation data acquisition system we have undertaken to design and implement software tools that are easily transportable to new modules. The first implementation of this software is for Motorola 68K series processor boards in FASTBUS and VME and will be used in the Fermilab accelerator run at the beginning of 1990. We use a Real Time Kernel Operating System. The software provides general connectivity tools for control, diagnosis and monitoring. 17 refs., 7 figs.
Date:
December 1, 1989
Creator:
Pordes, R.; Berg, D.; Berman, E.; Bernett, M.; Brown, D.; Constanta-Fanourakis, P. et al.
Object Type:
Article
System:
The UNT Digital Library
UNLV Information Science Research Institute quarterly progress report
This report presents research on information systems, information retrieval, and optical character recognition. (CBS)
Date:
December 31, 1991
Creator:
Nartker, T.A.
Object Type:
Report
System:
The UNT Digital Library
Modified Murnaghan equation of state applied to shock compression of silica, basalt, and dolomite
An equation of state previously used by the author is developed further and applied to geologic media. The equation is of the same form as the Murnaghan equation of state, but with the elastic constant terms replaced by the cohesive energy density (internal pressure), and the exponential term given as a sum of the Gruneisen parameter and the gaseous adiabatic exponent. Data for shock compression of silica, basalt, and dolomite are analyzed according to the equation.
Date:
December 20, 1965
Creator:
Rogers, L.A.
Object Type:
Article
System:
The UNT Digital Library
ORNL TNS program: microwave start-up of tokamak plasmas near electron cyclotron and upper hybrid resonances
The scenario of toroidal plasma start-up with microwave initiation and heating near the electron cyclotron frequency is suggested and examined here. We assume microwave irradiation from the high field side and an anomalously large absorption of the extraordinary waves near the upper hybrid resonance. The dominant electron energy losses are assumed to be due to magnetic field curvature and parallel drifts, ionization of neutrals, cooling by ions, and radiation by low Z impurities. It is shown by particle and energy balance considerations that electron temperatures around 250 eV and densities of 10/sup 12/ to 10/sup 13/ cm/sup -3/ can be maintained, at least in a narrow region near the upper hybrid resonance, with modest microwave powers in the Impurity Study Experiment (ISX) (120 kW at 28 GHz) and The Next Step (TNS) (0.57 MW at 120 GHz). The loop voltages required for start-up from these initial plasmas are also estimated. It is shown that the loop voltage can be reduced by a factor of five to ten from that for unassisted start-up without an increase in the resistive loss in volt-seconds. If this reduction in loop voltage is verified in the ISX experiments, substantial savings in the cost of power …
Date:
December 1, 1977
Creator:
Peng, Y. K. M. & Borowski, S. K.
Object Type:
Report
System:
The UNT Digital Library
Bond-Strength Studies for 1-Mil-Diameter Gold Wires Bonded to Hybrid Microcircuit Substrates
Detailed studies of the failure probability for gold wires bonded to multiplexer substrates under severe acceleration in the W79 artillery shell environments were made. The studies included: the calculated resultant pull forces exerted on the bond joints due to the W79 acceleration environments; the suitability of the loop-hook pull tests and the use of the normal Gaussian distribution theory for statistical description of bond strengths; and the probability of failure for gold wires bonded to multiplexer substrates under artillery shell accelerations using fixed angle pull tests and a Weilbull distribution theory for the statistical description. Preliminary statistical analyses of the bond strength data obtained from the conventional loop-hook pull tests for a multiplexer substrate HMC, have shown that the ball bond is strong enough to withstand the 0.17 gram design limit load due to the W79 gun barrel environments with a very low probability of failure. For the wedge bond, however, the results of a statistical analysis for the bond strength agree with experience which shows that the wedge bonds are generally much weaker than ball bonds in multiplexer substrates, and the probability of failure may be high enough to cause a problem. The degradation of the wedge bond strength …
Date:
December 1, 1981
Creator:
Kan, Y.R. & Prantil, V.C.
Object Type:
Report
System:
The UNT Digital Library
Kinetic analysis of dynamic PET data
Our goal is to quantify regional physiological processes such as blood flow and metabolism by means of tracer kinetic modeling and positron emission tomography (PET). Compartmental models are one way of characterizing the behavior of tracers in physiological systems. This paper describes a general method of estimating compartmental model rate constants from measurements of the concentration of tracers in blood and tissue, taken at multiple time intervals. A computer program which applies the method is described, and examples are shown for simulated and actual data acquired from the Donner 280-Crystal Positron Tomograph.
Date:
December 1, 1983
Creator:
Knittel, B.
Object Type:
Report
System:
The UNT Digital Library