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19,325 Matching Results
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Development of methods and procedures for high rate low energy expenditure fabrication of solar cells. Final report
A one year program to develop a new concept for silicon solar cell production based upon the use of pulsed electron beam processes combined with ion implantation has been completed. Feasibility of producing solar cells at high speed by a simplified vacuum-room temperature processing sequence has been demonstrated. The method has many advantages, particularly for large scale production at lowest possible cost.
Date:
November 1, 1976
Creator:
Kirkpatrick, A. R.; Minnucci, J. A. & Greenwald, A. C.
Object Type:
Report
System:
The UNT Digital Library
Physics with polarized beams. Report of the ANL Technical Advisory Panel. [Research with polarized proton beams]
Experimental directions which will be the most useful in developing underlying theories of hadronic collisions are outlined. As a pedagogical device to accomplish this, approximate percentages of a total program which could be devoted to different areas have been quoted. Findings are presented in the form of a short basic report with several long detailed appendices. In the basic report our opinion as to the amount of polarized beam experimental effort that should be applied to the following areas is stated: nucleon-nucleon scattering, quasi-two-body processes, inclusive production, and new or unexplored areas (such as large p/sub T/ and invariance principles). Our reasoning is discussed briefly, however, the details are left for the appendices. Members of the panel present certain aspects of the above areas, which should be useful for planning and/or performing polarized beam experiments. The seven presentations are abstracted separately in ERA.
Date:
November 1, 1975
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Applied chromodynamics
A number of novel features of QCD are reviewed, including the consequences of formation zone and color transparency phenomena in hadronic collisions, the use of automatic scale setting for perturbative predictions, null-zone phenomena as a fundamental test of gauge theory, and the relationship of intrinsic heavy colored particle Fock state components to new particle production. We conclude with a review of the applications of QCD to nuclear multiquark systems. 74 references.
Date:
November 1, 1983
Creator:
Brodsky, S. J.
Object Type:
Article
System:
The UNT Digital Library
Effects of CTR irradiation on the mechanical properties of structural materials
Mechanical properties of CTR structural materials are important in determining the reliability and economics of fusion power. Furthermore, these properties are significantly affected by the high neutron flux experienced by components in the regions near the plasma of the fusion reactor. In general, irradiation hardens the material and leads to a reduction in ductility. An exception to this is in some complex engineering alloys where either hardening or softening can be observed depending on the alloy and the irradiation conditions. Regardless of this restriction, irradiation usually leads to a reduction in ductility. Available tensile data examined in this paper show that significant ductility reduction can be found for irradiation conditions typical of CTR operation. Consideration of these effects show that extensive work will be needed to fully establish the in-service properties of CTR structures. This information will be used by designers to develop conditions and design philosophies adapted to avoid the most deleterious conditions and minimize stresses on structures on reactor design. The information will also be used as input to alloy development programs with goals of producing materials more resistant to property degradation during irradiation. It is clear that a great deal of additional work will be required both …
Date:
November 1, 1976
Creator:
Wiffen, F. W.
Object Type:
Report
System:
The UNT Digital Library
Energy conversion and economics for geothermal power generation at Heber, California, Valles Caldera, New Mexico, and Raft River, Idaho: case studies. Topical report 2
A portion of the results from a one-year study to assess the feasibility of constructing a 25 to 50 MWe geothermal power plant using low-salinity hydrothermal fluids as the energy source is presented. The objective of this report was to investigate the compatibility of the different power conversion options with real geothermal reservoirs and to analyze the economics of power generation. Nine cases are discussed which were chosen to yield further insight into the effect of reservoir temperature on the choice of conversion technology and power costs. These cases examine flashed steam, binary cycle and hybrid conversion for Raft River, Idaho; Heber, California; and Valles Caldera, New Mexico that have bottom-hole temperatures of approximately 150/sup 0/C, 180/sup 0/C and 260/sup 0/C, respectively. Conceptual layouts of the power conversion processes, cycle analyses and economic analyses are presented. The principal conclusions are: a hydrothermal demonstration plant is technically environmentally, and economically feasible in the 1980 time frame; the recommended demonstration site is Heber, Imperial Valley, California; binary cycle power conversion technology is recommended; the recommended demonstration plant capacity is approximately 50 MWe; and there are no overriding environmental constraints.
Date:
November 1, 1976
Creator:
Holt, B. & Ghormley, E. L.
Object Type:
Report
System:
The UNT Digital Library
Study of efficient high-power, high-energy neutral beams for the Reference Mirror Reactor
An injector design for the Reference Mirror Reactor is described which uses negative ions created by charge-exchange in a cesium vapor cell and neutralized by photodetachment. Some of the innovations discussed include a continuously operating cathode for an LBL/LLL ion source, a negative ion beam line with cooled grids, a high voltage accelerator configuration with insulators shielded from the neutron and gamma flux, and cryopanels which continuously cycle between pumping and outgassing modes.
Date:
November 11, 1976
Creator:
Fink, J. H.; Barr, W. L. & Hamilton, G. W.
Object Type:
Report
System:
The UNT Digital Library
Methods for analysis of trace elements in coal, coal fly ash, soil, and plant samples. [59 refs]
Results of a literature search are presented, and analytical methods are proposed for studies of trace elements in coal, coal ash residue, soil, and vegetation. Increased trace element levels in soils and plants collected near power plants have been reported by several investigators. Many sample dissolution and analysis techniques were used in the reported studies. A nine-laboratory comparison of trace element analyses for a variety of methods showed excessive variation relative to quoted uncertainty limits. Analysis results from a subsequent four-laboratory comparison of instrumental nuclear techniques for trace element analysis agreed with the National Bureau of Standards certified values for all nine elements determined. Instrumental neutron activation analysis, spark source mass spectrometry, and atomic absorption spectrometry are proposed as primary analysis methods for coal, coal ash, soil, and plants in a Savannah River Laboratory study of trace elements. Bomb procedures are proposed for dissolution of samples.
Date:
November 1, 1976
Creator:
Slates, R. V.
Object Type:
Report
System:
The UNT Digital Library
Summary of radiation-induced transient absorption and recovery in fiber optic waveguides. [Pulsed electrons and x-rays]
The absorption induced in fiber optic waveguides by pulsed electron and X-ray radiation has been measured as a function of optical wavelength from 450 to 950 nm, irradiation temperature from -54 to 71/sup 0/C, and dose from 1 to 500 krads. The fibers studied are Ge-doped silica core fibers (Corning Low Loss), ''pure'' vitreous silica core fibers (Schott, Bell Laboratories, Fiberoptic Cable Corp., and Valtec Fiberoptics), polymethyl-methacrylate core fibers (DuPont CROFON and PFX), and polystyrene core fibers (International Fiber Optics and Polyoptics). Models that have been developed to account for the observed absorption recovery are also summarized.
Date:
November 1, 1976
Creator:
Skoog, C. D.
Object Type:
Report
System:
The UNT Digital Library
Energy and technology review
A separate abstract was prepared for each of the three articles in this issue. (RWR)
Date:
November 1, 1976
Creator:
Selden, R. W.
Object Type:
Report
System:
The UNT Digital Library
PC-DYMAC: Personal Computer---DYnamic Materials ACcounting
This manual was designed to provide complete documentation for the computer system used by the EBR-II Fuels and Materials Department, Argonne National Laboratory-West (ANL-W) for accountability of special nuclear materials (SNM). This document includes background information on the operation of the Fuel Manufacturing Facility (FMF), instructions on computer operations in correlation with production and a detailed manual for DYMAC operation. 60 figs.
Date:
November 1, 1989
Creator:
Jackson, B. G.
Object Type:
Report
System:
The UNT Digital Library
HEATUP: a computer program for the thermal anaysis of a LOFC accident in an HTGR
The HEATUP code, a modification of the general, time-dependent, one-, two-, and three-dimensional program HEATING5, was designed for the thermal analysis of a Loss of Forced Circulation accident in a High Temperature Gas-Cooled Reactor. This report contains a description of the computational model which includes: a description of the basic problem; a short review of preliminary results related to the choice of thermal properties, boundary conditions and initial conditions; a full description of a typical three-dimensional R-Z model and a limited one of a two-dimensional RZ model. HEATUP's additional computations are presented together with the method of input preparation. The three-dimensional model of the Fulton Generating Station Loss of Forced Circulation accident is used as a sample problem. A complete presentation of the input data is made. Also, the computer printout of the sample problem input data and results are given.
Date:
November 1, 1976
Creator:
Siman-Tov, I. I. & Turner, W. D.
Object Type:
Report
System:
The UNT Digital Library
Determination of permeability of granitic rocks in GT-2 from hydraulic fracturing data
The Los Alamos Scientific Laboratory is currently conducting a study to determine the feasibility to extract geothermal energy from dry hot rock. The investigated concept calls for the creation of a hydraulic fracture in hot, impermeable rock. Heat will be exchanged subsequently at the fracture surface between the rock and a circulating fluid. The successful creation of hydraulic fractures in the granitic section of exploratory holes GT-1 and GT-2 yielded sufficient data to calculate the average permeability of the rock next to a fracture by means of the mathematical model. The calculated permeabilities were found to be in the microdarcy range and proved the granitic rock penetrated by GT-1 and GT-2 to be sufficiently impermeable to test the above concept. (auth)
Date:
November 1, 1975
Creator:
Delisle, G.
Object Type:
Report
System:
The UNT Digital Library
Characteristics of an intense neutron source based on the d + Be reaction
A neutron source designed for fusion-related radiation damage studies has been built based on the d + Be reaction. Using a 40 MeV, 20 ..mu..A deuteron beam from the Oak Ridge Isochronous Cyclotron neutron fluxes of 1 - 2 x 10/sup 12/n/cm/sup 2//sec are obtained over an area approx. 50 mm/sup 2/. The design of the source is described, together with time-of-flight and activation foil measurements of the thick target neutron yields from the /sup 9/Be(d,n) reaction for the angular range from 0 to 90/sup 0/. A dosimetry procedure based on these measurements is presented. In addition time-of-flight measurements of the thick target neutron yields for the Li(d,n) reaction are reported and compared with the /sup 9/Be(d,n) results.
Date:
November 1, 1976
Creator:
Saltmarsh, M. J.; Ludemann, C. A.; Fulmer, C. B. & Styles, R. C.
Object Type:
Report
System:
The UNT Digital Library
Potentiometric determination of sulfate with EDTA and the cupric-selective electrode
Sulfate was indirectly determined by precipitating sulfate as BaSO/sub 4/ and then dissolving BaSO/sub 4/ in excess ammoniacal EDTA. The excess EDTA was titrated potentiometrically with La/sup 3 +/. A cupric-selective electrode was used to detect the end point. About 10/sup -3/M SO/sub 4//sup 2 -/ was determined in 3M HCl solutions of metal oxides with a relative standard deviation of 3.5 percent and a bias of +4 percent.
Date:
November 1, 1976
Creator:
Baumann, E. W.
Object Type:
Report
System:
The UNT Digital Library
Pelletizing/reslurrying as a means of distributing and firing clean coal
The objective of this study is to develop technology that permits the practical and economic preparation, storage, handling, and transportation of coal pellets, which can be reslurried into Coal water fuels (CWF) suitable for firing in small- and medium-size commercial and industrial boilers, furnaces, and engines. The project includes preparing coal pellets and capsules from wet filter cake that can be economically stored, handled, transported, and reslurried into a CWF that can be suitably atomized and fired at the user site. The wet cakes studied were prepared from ultra-fine (95% -325 mesh) coal beneficiated by advanced froth-flotation techniques. The coals studied included two eastern bituminous coals, one from Virginia (Elkhorn) and one from Illinois (Illinois No. 6) and one western bituminous coal from Utah (Sky Line coal).
Date:
November 21, 1991
Creator:
Conkle, H. N.; Raghavan, J. K.; Smit, F. J. & Jha, M. C.
Object Type:
Report
System:
The UNT Digital Library
Effects of the trip phenomenon on the toughness of heat treatable alloy steels. [AISI 4330]
It is shown that substantial amounts of untransformed austenite may be obtained in low alloy steels by a combination of alloy modification (addition of silicon) and heat treatment. In silicon modified AISI 4330 steel, the amount of untransformed austenite is varied by utilizing isothermal treatments both above and below the M/sub s/. The stability of the untransformed austenite is found to be dependent on the amount of silicon and also on the tempering temperature. A magnetic saturation technique was utilized to monitor the transformation of the austenite under uniaxial tensile loading. An improvement in the plane strain fracture toughness (K/sub Ic/) was observed when the retained austenite transformed with respect to strain. This improvement was optimized with particular combinations of stability and volume fractions of retained austenite. The addition of silicon resulted in an increase of both the strength and the fracture toughness (K/sub Ic/) of the quenched and tempered AISI 4330 steel. Yield strengths in the range of 200-220 ksi and K/sub Ic/ values as high as 107 ksi..sqrt..in were obtained. The microstructure was characterized using both optical and electron microscopy and is correlated with the mechanical properties.
Date:
November 10, 1976
Creator:
Kohn, G.
Object Type:
Report
System:
The UNT Digital Library
Systems study of fuels from grains and grasses. Quarterly progress report, July--October 1976
The specific objectives of the project are to determine on a geographic basis the current and potential USA production capability for grain and grass crops, to perform a preliminary screening of conversion processes, and to perform preliminary technical and economic feasibility analyses. The results obtained to date on biomass production, conversion processes, and data management are reported. (JSR)
Date:
November 15, 1976
Creator:
Benson, W.; Allen, A.; Athey, R. & McElroy, A.
Object Type:
Report
System:
The UNT Digital Library
Chemistry of the KALC process. The CO/sub 2/--I/sub 2/--CH/sub 3/I--H/sub 2/O system
The chemistry of the CO/sub 2/--I/sub 2/--CH/sub 3/I--H/sub 2/O system in stainless steel has been investigated with respect to the probable reactions of these components in the KALC process. Iodine is stable in dry CO/sub 2/ contained in stainless steel; but in the presence of organic impurities or water, it is lost from solution via reactions which produce solid phases. Methyl iodide, however, is stable in either wet or dry CO/sub 2/ solutions. Distribution coefficients for I/sub 2/ and CH/sub 3/I between gas and liquid CO/sub 2/ have been measured from -26 to +30/sup 0/C; they show that the solutes favor the liquid phase as the temperature is lowered. The corrosion loss of I/sub 2/ in the presence of 10 to 200 ppm H/sub 2/O has been followed as a function of time at 0 and +21/sup 0/C. Weak associations between CO/sub 2/ and I/sub 2/, CO/sub 2/ and H/sub 2/O, and I/sub 2/ and I/sub 2/ can account for shifts in their respective distribution coefficients, but these associations are not strong enough to produce isolable phases. The occurrence of a weak CO/sub 2/.H/sub 2/O molecular species in the vapor is demonstrated by the near-infrared vibrations of the water group …
Date:
November 1, 1976
Creator:
Toth, L. M.; Bell, J. T.; Fuller, D. W.; Buxton, S. R.; Friedman, H. A. & Billings, M. R.
Object Type:
Report
System:
The UNT Digital Library
CO/sub 2/ laser ionization of very high lying valence states in atomic uranium
Results of recently concluded investigations of infrared laser induced photoionization of very high lying even parity levels in atomic uranium are presented. Behavior of both Rydberg and valence states is described.
Date:
November 17, 1975
Creator:
Paisner, J. A.; Solarz, R. W.; Carlson, L. R.; May, C. A. & Johnson, S. A.
Object Type:
Article
System:
The UNT Digital Library
Quantum theory and the emergence of patterns in the universe
The topic of this symposium is the quest to discover, define, and interpret patterns in the universe. This quest has two parts. To discover and define these patterns is the task of science: this part of the quest is producing a copious flow of reliable information. To interpret or give meaning to these patterns is the task of natural philosophy: this part has not kept pace.
Date:
November 1, 1989
Creator:
Stapp, H. P.
Object Type:
Article
System:
The UNT Digital Library
Reactive scattering of halogen molecules. [Angular and velocity distributions, stabilities 6. 8 to 17. 7 kcal/mole, FORTRAN]
A study of the endoergic, bimolecular reactions of F/sub 2/ with I/sub 2/, ICl, and HI in a crossed molecular beam experiment is described. The trihalogens IIF, ClIF, and HIF were directly observed as the products of these reactions. At high collision energies a second reactive channel producing IF becomes important. Product angular and velocity distributions show that this IF does not result from a four-center exchange reaction. Measured threshold energies for the formation of IIF, ClIF, and HIF yield lower bounds to the stabilities of these molecules, with respect to the separated atoms, of 69, 81, and 96 kcal/mole, respectively. Analysis of product center-of-mass angular distributions indicates that a slightly nonlinear approach is most effective in bringing about reaction to form the stable triatomic radical. Also described is a crossed molecular beam study of the Cl + Br/sub 2/ ..-->.. BrCl + Br reaction at collision energies from 6.8 to 17.7 kcal/mole. The results indicate that this reaction has the characteristics of an exoergic reaction on an attractive potential energy surface with early energy release. Reagent translational energy is very efficiently channeled into product internal energy. At high collision energy the reaction appears to approach the spectator stripping limit. …
Date:
November 1, 1976
Creator:
Valentini, J. J.
Object Type:
Report
System:
The UNT Digital Library
A preliminary measurement of R[sub b] = [Gamma]([Zeta][degrees] [yields] b[bar b])/[Gamma]([Zeta][degrees] [yields] hadrons) at SLD
We present a preliminary measurement of R[sub b], the ratio of [Gamma](Z[degree] - b[bar b]) relative to [Gamma](Z[degree] [yields] hadrons) using the silicon CCD-pixel vertex detector of the SLD at the SLAC Linear Collider (SLC). An impact parameter method and a displaced vertex method are applied to all charged tracks, to efficiently tag Z[degree] - b[bar b] events. From the impact (displaced vertex) approach we find R[sub b] = 0.214 [plus minus] 0.010 [plus minus] 0.025 (R[sub b] = 0.204 [plus minus] 0.010 [plus minus] 0.030), consistent with the standard model value.
Date:
November 1, 1992
Creator:
Su, D. (Rutherford Appleton Lab., Chilton (United Kingdom))
Object Type:
Article
System:
The UNT Digital Library
Technical evaluation of the adequacy of station electric distribution system voltages for the Rancho Seco Nuclear Generating Station, Unit No. 1: selected issues program (Docket No. 50-312)
This report documents the technical evaluation of the adequacy of the station electric distribution system voltages for the Rancho Seco Nuclear Generation Station, Unit No. 1. The evaluation is to determine if the onsite distribution system, in conjunction with the offsite power sources, has sufficient capacity to automatically start and operate all Class 1E loads within the equipment voltage ratings under certain conditions established by the Nuclear Regulatory Commission. The licensee demonstrates with the analysis that with certain modifications the guidelines and requirements of the NRC will be met.
Date:
November 10, 1981
Creator:
White, R. L.
Object Type:
Report
System:
The UNT Digital Library
Experimental two-phase liquid-metal magnetohydrodynamic generator program. Annual report. [NaK-nitrogen generator]
A new diverging-channel liquid-metal MHD generator with gas injection along the insulating walls was built and placed in operation in late 1974. This generator yielded nearly-constant liquid velocity along the channel for near-design conditions, as desired for best performance. Extensive measurements of the generator terminal and internal parameters were made over a range of gas and liquid flow rates, magnetic field strengths, and load resistance values. Data are given for generator efficiency and load voltages, and the variations along the channel of liquid and gas velocities, pressure, local load factor, void fraction, and slip ratio. Comparisons are made with theoretical predictions. Tests made to evaluate the effectiveness of the gas injection indicated that the generator performance improved slightly as the amount of gas injected was decreased, and that the injected gas was not forming the desired pure-gas wall layer. Following this, air-water tests indicated that this was to be expected, and a one-dimensional computer model indicated that performance should be better without the partial flow obstruction of the gas injection ports. The gas injection ports were removed, and substantial improvement was obtained in generator performance--by far the best to date. Data comparable to that for gas injection is presented for …
Date:
November 1, 1976
Creator:
Petrick, M; Fabris, G; Cole, R; Hantman, R; Pierson, E & Cutting, J
Object Type:
Report
System:
The UNT Digital Library