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3-D object reconstruction emission and transmission tomography with limited angular input (open access)

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
3-D research transport codes at Los Alamos (open access)

3-D research transport codes at Los Alamos

We describe 3-D research transport codes which have been developed at Los Alamos National Laboratory over the last three years. Some simple example calculations are presented.
Date: October 1, 1994
Creator: Morel, J. E.; McGhee, J. M. & Walters, W. F.
Object Type: Article
System: The UNT Digital Library
3-D Target Location from Stereoscopic SAR Images (open access)

3-D Target Location from Stereoscopic SAR Images

SAR range-Doppler images are inherently 2-dimensional. Targets with a height offset lay over onto offset range and azimuth locations. Just which image locations are laid upon depends on the imaging geometry, including depression angle, squint angle, and target bearing. This is the well known layover phenomenon. Images formed with different aperture geometries will exhibit different layover characteristics. These differences can be exploited to ascertain target height information, in a stereoscopic manner. Depending on the imaging geometries, height accuracy can be on the order of horizontal position accuracies, thereby rivaling the best IFSAR capabilities in fine resolution SAR images. All that is required for this to work are two distinct passes with suitably different geometries from any plain old SAR.
Date: October 1, 1999
Creator: Doerry, Armin W.
Object Type: Report
System: The UNT Digital Library
3-D Thermal Evaluations for a Fueled Experiment in the Advanced Test Reactor (open access)

3-D Thermal Evaluations for a Fueled Experiment in the Advanced Test Reactor

The DOE Advanced Fuel Cycle Initiative and Generation IV reactor programs are developing new fuel types for use in the current Light Water Reactors and future advanced reactor concepts. The Advanced Gas Reactor program is planning to test fuel to be used in the Next Generation Nuclear Plant (NGNP) nuclear reactor. Preliminary information for assessing performance of the fuel will be obtained from irradiations performed in the Advanced Test Reactor large ''B'' experimental facility. A test configuration has been identified for demonstrating fuel types typical of gas cooled reactors or fast reactors that may play a role in closing the fuel cycle or increasing efficiency via high temperature operation Plans are to have 6 capsules, each containing 12 compacts, for the test configuration. Each capsule will have its own temperature control system. Passing a helium-neon gas through the void regions between the fuel compacts and the graphite carrier and between the graphite carrier and the capsule wall will control temperature. This design with three compacts per axial level was evaluated for thermal performance to ascertain the temperature distributions in the capsule and test specimens with heating rates that encompass the range of initial heat generation rates.
Date: October 6, 2004
Creator: Ambrosek, Richard G.; Chang, Gray S. & Utterbeck, Debby J.
Object Type: Article
System: The UNT Digital Library
3-D Thermal Evaluations for a Fueled Experiment in the Advanced Test Reactor (open access)

3-D Thermal Evaluations for a Fueled Experiment in the Advanced Test Reactor

The DOE Advanced Fuel Cycle Initiative and Generation IV reactor programs are developing new fuel types for use in the current Light Water Reactors and future advanced reactor concepts. The Advanced Gas Reactor program is planning to test fuel to be used in the Next Generation Nuclear Plant (NGNP) nuclear reactor. Preliminary information for assessing performance of the fuel will be obtained from irradiations performed in the Advanced Test Reactor large “B” experimental facility. A test configurations has been identified for demonstrating fuel types typical of gas cooled reactors or fast reactors that may play a role in closing the fuel cycle or increasing efficiency via high temperature operation Plans are to have 6 capsules, each containing 12 compacts, for the test configuration. Each capsule will have its own temperature control system. Passing a helium-neon gas through the void regions between the fuel compacts and the graphite carrier and between the graphite carrier and the capsule wall will control temperature. This design with three compacts per axial level was evaluated for thermal performance to ascertain the temperature distributions in the capsule and test specimens with heating rates that encompass the range of initial heat generation rates.
Date: October 1, 2004
Creator: Ambrosek, Richard; Chang, Gray & Utterbeck, Debra
Object Type: Article
System: The UNT Digital Library
A 3-D time-dependent unstructured tetrahedral-mesh SP{sub N} method (open access)

A 3-D time-dependent unstructured tetrahedral-mesh SP{sub N} method

We have developed a 3-D time-dependent multigroup SP{sub n} method for unstructured tetrahedral meshes. The SP{sub n} equations are expressed in a canonical form which allows them to be solved using standard diffusion solution techniques in conjunction with source iteration, diffusion-synthetic acceleration, and fission-source acceleration. A computational comparison of our SP{sub n} method with an even-parity S{sub n} method is given.
Date: October 1, 1994
Creator: Morel, J. E.; McGhee, J. M. & Larsen, E. W.
Object Type: Article
System: The UNT Digital Library

E-3 in parade (Oct. 1949)

None
Date: October 1949
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History

3"Ind. Make Up Feed Line from #1 & #2 Fire Rooms to Engine Room [Boiler Room]

Blueprint depicting technical details of Battleship Texas.
Date: October 4, 1929
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
3 Plant Radiation Study Interim Report #5- Part II Data on Gamma Shielding of Special Plutonium Samples (open access)

3 Plant Radiation Study Interim Report #5- Part II Data on Gamma Shielding of Special Plutonium Samples

The calculation of shielding the thickness for plutonium is complicated by the many different energies represented in the gamma radiation emitted during decay of the plutonium isotopes. Dose rate predictions are also frequently confused by gamma from varying content of fission product impurities in the plutonium, as well as other gamma radiation induced through alpha and neutron particle absorption within the source material or its environment. After assumptions are made for these many factors the radiation data for shielding determination is still frequently inadequate because of wide variations in dose rates resulting from self-absorption. The degree if self-shielding is in turn dependent on nature of the plutonium compound, degree of compactness, weight, and over-all geometrical distribution of the source material. By preparing a variety of plutonium samples representing combinations of these varying factors, actual dose rates and gamma spectra, as obtained from them, can then be extrapolated for application to specific situations.
Date: October 22, 1959
Creator: Moulthrop, H. A.
Object Type: Report
System: The UNT Digital Library

3" Standard High Pressure Gate Valve Cast Steel 101 - 300 Lbs. Pressure

Blueprint depicting technical details of Battleship Texas.
Date: October 27, 1925
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
A 4.2 GS/S Synchronized Vertical Excitation System for SPS Studies - Steps Toward Wideband Feedback (open access)

A 4.2 GS/S Synchronized Vertical Excitation System for SPS Studies - Steps Toward Wideband Feedback

None
Date: October 18, 2013
Creator: Fox, J. D.; Olsen, J.; Rivetta, C.; Rivetta, I.; Turgut, O.; Uemura, S. et al.
Object Type: Article
System: The UNT Digital Library

4.5" & 5" cylinder relief valve

Blueprint depicting technical details of Battleship Texas.
Date: October 2, 1913
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
4.5 Meter high level waste canister study (open access)

4.5 Meter high level waste canister study

The Tank Waste Remediation System (TWRS) Storage and Disposal Project has established the Immobilized High-Level Waste (IBLW) Storage Sub-Project to provide the capability to store Phase I and II BLW products generated by private vendors. A design/construction project, Project W-464, was established under the Sub-Project to provide the Phase I capability. Project W-464 will retrofit the Hanford Site Canister Storage Building (CSB) to accommodate the Phase I I-ILW products. Project W-464 conceptual design is currently being performed to interim store 3.0 m-long BLW stainless steel canisters with a 0.61 in diameter, DOE is considering using a 4.5 in canister of the same diameter to reduce permanent disposal costs. This study was performed to assess the impact of replacing the 3.0 in canister with the 4.5 in canister. The summary cost and schedule impacts are described.
Date: October 1, 1997
Creator: Calmus, R.B., Westinghouse Hanford, Richland, WA
Object Type: Report
System: The UNT Digital Library
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 26, Ed. 1 Monday, October 3, 1977 (open access)

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 (open access)

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 (open access)

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 (open access)

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 (open access)

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 (open access)

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 (open access)

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 (open access)

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 (open access)

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 (open access)

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
4 MW upgrade to DIII-D FWCD system: System commissioning and initial operation (open access)

4 MW upgrade to DIII-D FWCD system: System commissioning and initial operation

The initial installation of the 4 MW fast wave current drive (FWCD) upgrade started in 1992 with the purchase of two ABB/Thomcast AG rf power amplifiers. These amplifiers cover the frequency range 30 MHz to 120 MHz. A maximum output power of over 2 MW between 30 MHz and 80 MHz and 1 MW at 120 MHz were the specification requirements. The system as installed is comprised of the two mentioned rf amplifiers, coaxial transmission and matching components, rf phase and amplitude monitoring, and a SUN SparcStation 10 control system. Due to various reasons almost every major component in the system required redesign and engineering in order to meet the system requirements. The failures, probable cause and the final redesigns will be discussed as well as some thoughts on how better to specify system requirements for future systems.
Date: October 1995
Creator: Cary, W. P.; Callis, R. W.; de Grassie, J. S.; Harris, T. E.; O`Neill, R. C.; Pinsker, R. I. et al.
Object Type: Article
System: The UNT Digital Library