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20,991 Matching Results
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3-D object reconstruction emission and transmission tomography with limited angular input
The effects of the angular range of data taking in reconstructions in planar positron cameras using the deconvolution method and the matrix method, respectively, are investigated. It is found that in the absence of any a priori information there are undetermined components in the reconstruction if the field of view of the positron camera is limited. However, most of the undetermined components are recovered in the case in which the transverse spacing of the object is discrete, and all of them are recovered if the fact that the object extent is finite is utilized. It is concluded that the two reconstruction methods are mathematically equivalent. The results obtained can be applied to other transmission and emission imaging devices.
Date:
October 1978
Creator:
Tam, K. C.; Perez-Mendez, V. & Macdonald, B.
Object Type:
Article
System:
The UNT Digital Library
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 26, Ed. 1 Monday, October 3, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 3, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 27, Ed. 1 Monday, October 10, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 10, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 28, Ed. 1 Monday, October 17, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 17, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 29, Ed. 1 Monday, October 24, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 24, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 30, Ed. 1 Monday, October 31, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 31, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 26, Ed. 1 Monday, October 2, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 2, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 27, Ed. 1 Monday, October 9, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 9, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 28, Ed. 1 Monday, October 16, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 16, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 29, Ed. 1 Monday, October 23, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 23, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
The 4-County News Bulletin (Castroville, Tex.), Vol. 20, No. 30, Ed. 1 Monday, October 30, 1978
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 30, 1978
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
5 kWe reactor TE reflector sector drive actuator design summary
None
Date:
October 1, 1972
Creator:
Donelan, L.E.
Object Type:
Report
System:
The UNT Digital Library
15 cm duoPIGatron ion source
The 10-cm (grid diameter) duoPIGatron ion source produces pulsed hydrogen ion beams of 10 to 15 A beam current in the 20- to 40-keV energy range for a duration of a few tenths of a second. To fulfill the requirements of the next generation of high-power neutral beam injectors for heating plasmas in CTR devices, this source has been enlarged to a version 15-cm in grid diameter. In addition, by utilizing a magnetic multipole line cusp field confinement method, the plasma created is characterized over the 15 cm grid diameter by a noise level within +- 10 percent and spatial density variations within +- 15 percent at a density on the order of 10/sup 12/ cm/sup -3/. This larger source has operated reliably and produced a beam current exceeding 30 A of hydrogen at 27 keV. Initial operation of a 20-cm version of this source employing line cusp confinement has produced an extraction current of 60 A at 33 keV.
Date:
October 1, 1976
Creator:
Stirling, W. L.; Tsai, C. C. & Ryan, P. M.
Object Type:
Report
System:
The UNT Digital Library
25 megajoule energy storage and delivery system for the Shiva laser
A 25 megajoule, 20 kV capacitive energy storage and delivery system has been built and tested for Shiva--a 20 arm, 10 kJ, 20 TW neodymium glass fusion research laser. This system supplies over 3.5 megamperes to xenon flashlamps for optical pumping of the laser amplifier. About 15% of the energy is used to establish magnetic fields within Faraday rotator glass. A digital based control and diagnostics scheme is employed through the entire pulse power system. This scheme utilizes a distributed digital data bus that addresses every element through two levels of optical isolation. The interfacing of low level digital circuitry to a pulse power environment is discussed, as well as the design and performance of the total system. Cost and manufacturing details are important in a project of this size. The projected cost goal of 27 cents/joule, installed and operating, has been met. The general approach to the design, transient analysis, manufacture, and activation of this large power conditioning system is also discussed.
Date:
October 18, 1977
Creator:
Gagnon, W.L.; Rupert, P. R.; Berkbigler, L.; Carder, B. M.; Gritton, D. G.; Holloway, R. W. et al.
Object Type:
Article
System:
The UNT Digital Library
100,000 quads of natural gas
Of the various possible unconventional natural gas resources that have been examined, the most recent, and by far the largest, is that which is dissolved in the hot salt water within the geopressurized zones of the Gulf Coast. Recent assessments have estimated that the amount of gas contained in these waters, underlying about 150,000 sq. mi. of Texas and Louisiana--both onshore and offshore--is between 60,000 and 100,000 quads. In addition to the natural gas, there is a huge potential for producing electric power from the heat content of the fluid, as well as other potential uses for hot water. The net value of this geothermal heat may be about half that of the natural gas. The major problems associated with commercial production of the fluids from these zones and the extraction of energy from the heat and pressure of the fluid are discussed and the long-term potential is estimated. It appears likely that commercial production will depend upon the existence of uncontrolled prices for natural gas and the satisfactory resolution of various legal, environmental, and institutional problems, all of which are likely to require considerable effort. Although the production potential from the Gulf Coast zones might be accurately estimated after …
Date:
October 1, 1976
Creator:
Brown, William M.
Object Type:
Report
System:
The UNT Digital Library
100-keV Faraday cup design: materials and structure
A Faraday cup design for a 1 mA.cm/sup -2/ 100-keV, light-ion-beam measurement in background plasma is proposed. Features of this shielded, three-grid structure with deep target are described, and a mechanical draft is included. In the appendix, we reference and survey results of experiments reporting the number and energy range of secondary electrons and back-scattered ions originating on various metal surfaces bombarded with approximately 100-keV hydrogen and deuterium ions. Choice of target and grid materials in cup assembly follow from this survey.
Date:
October 11, 1976
Creator:
Jones, K.
Object Type:
Report
System:
The UNT Digital Library
150-m measurement of 0. 880- to 100. 0-keV neutron transmissions through four samples of /sup 238/U
In order to study the /sup 238/U + n total cross section, neutron transmissions through 0.076-, 0.254-, 1.080-, and 3.620-cm-thick samples of isotopically enriched /sup 238/U have been measured from 0.880 to 100.0 keV using a time-of-flight technique over a path length of 150 meters with the ORELA pulsed source and a 13-mm-thick Li-glass detector. The measurement is described in detail and both a listing and figures of the resulting transmissions are given. An absolute energy scale accurate to 2 parts in 10,000 was established.
Date:
October 1, 1977
Creator:
Olsen, D. K.; de Saussure, G.; Perez, R. B.; Difilippo, F. C.; Ingle, R. W. & Weaver, H.
Object Type:
Report
System:
The UNT Digital Library
244-S Catch Station conceptual design report
The faciliies described will provide a direct route from the 241-S-151 and 241-U-151 Diversion Boxes to the 241-SY Tanks. The 244-S Catch Station will consist of a 20,000 gallon primary tank contained within a concrete vault lined with carbon steel. Encased three-inch carbon steel process lines will be extended to the catch station pump pit from the 241-SY Tank Farm, the 241-S-151 Diversion Box and the 241-U-151 Diversion Box encasement. The facility will have its own ventilation system for exhausting the primary tank and the annulus area. A small instrument shack will house locally mounted instrumentation and controls. Existing designs for Project B-103 will be used where similarities exist (H-2-38200). The project is expected to cost $1,900,000 and require 19 months for the initiation of Title I design until construction is complete.
Date:
October 15, 1976
Creator:
Garfield, J. S.
Object Type:
Report
System:
The UNT Digital Library
880 nanosecond particle in cell mover for the CDC 7600
A very fast computational method of moving particles for one dimensional electrostatic plasma simulations using integer arithmetic is described. The cloud in cell method forms the basis of this technique. This paper is in the form of a compass compilable subroutine with comments and examples describing methods of using an entirely integer representation to gain up to an order of magnitude increase in speed over equivalent floating point Fortran coding. Integer arithmetic has several advantages over floating point arithmetic for one dimensional particle movers. The adds are much faster, and the binary numerical description allows the implementation of very simple boundary conditions if the simulation region extends from zero to a power of two. Furthermore, integer arithmetic makes very efficient use of each memory bit since there is no floating point exponent. Consequently, it becomes feasible and fast in long word length machines to pack the velocity and position of a particular particle into the same word, thus saving a factor of two in computer storage and/or 10. These advantages are combined with the fact that integer adds and logicals complete in only two computer cycles allowing nearly complete optimization of register and instruction interleaving. The measured timings on a …
Date:
October 4, 1977
Creator:
Estabrook, K. & Tull, J. E.
Object Type:
Report
System:
The UNT Digital Library
1000-Mwe Liquid Metal Fast Breeder Reactor Follow-on Study Conceptual Design Report. Volume I. Summary.
This report discusses the engineering studies which led to the AL task III final reference design and describes this design.
Date:
October 31, 1970
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1000-Mwe Liquid Metal Fast Breeder Reactor Follow-on Study. Conceptual System Design Descriptions.
None
Date:
October 31, 1970
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1000-Mwe Liquid Metal Fast Breeder Reactor Follow-on Study. Conceptual System Design Descriptions.
This report describes the number of service systems that perform in the plant.
Date:
October 31, 1970
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1000-Mwe Liquid Metal Fast Breeder Reactor Follow-on Study. Conceptual System Design Descriptions.
This report contains the design description of the 1000-Mwe Liquid Metal Fast Breeder Reactor.
Date:
October 31, 1970
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 2, No. 3, Ed. 1 Thursday, October 12, 1972
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 12, 1972
Creator:
Rimbold, Dorothy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History