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Direct Digital Phase Shift by DDS rf Source
None
Date:
April 13, 1993
Creator:
A., Pei
Object Type:
Report
System:
The UNT Digital Library
Numerically Controlled Phase Locked Loop Using Direct Digital Synthesizer
None
Date:
April 13, 1993
Creator:
A., Pei
Object Type:
Report
System:
The UNT Digital Library
Fundamental studies of fusion plasmas
Work on ICRF interaction with the edge plasma is reported. ICRF generated convective cells have been established as an important mechanism for influencing edge transport and interaction with the H-mode, and for controlling profiles in the tokamak scrape-off-layer. Power dissipation by rf sheaths has been shown to be significant for some misaligned ICRF and IIBW antenna systems. Near-field antenna sheath work has been extended to the far-field case, important for experiments with low single pass absorption. Impurity modeling and Faraday screen design support has been provided for the ICRF community. In the area of core-ICRF physics, the kinetic theory of heating by applied ICRF waves has been extended to retain important geometrical effects relevant to modeling minority heated tokamak plasmas, thereby improving on the physics base that is standard in presently employed codes. Both the quasilinear theory of ion heating, and the plasma response function important in wave codes have been addressed. In separate studies, it has been shown that highly anisotropic minority heated plasmas can give rise to unstable field fluctuations in some situations. A completely separate series of studies have contributed to the understanding of tokamak confinement physics. Additionally, a diffraction formalism has been produced which will be …
Date:
April 27, 1993
Creator:
Aamodt, R. E.; Catto, P. J.; D'Ippolito, D. A.; Myra, J. R. & Russell, D. A.
Object Type:
Report
System:
The UNT Digital Library
Fundamental studies of fusion plasmas. Annual performance report
Work on ICRF interaction with the edge plasma is reported. ICRF generated convective cells have been established as an important mechanism for influencing edge transport and interaction with the H-mode, and for controlling profiles in the tokamak scrape-off-layer. Power dissipation by rf sheaths has been shown to be significant for some misaligned ICRF and IIBW antenna systems. Near-field antenna sheath work has been extended to the far-field case, important for experiments with low single pass absorption. Impurity modeling and Faraday screen design support has been provided for the ICRF community. In the area of core-ICRF physics, the kinetic theory of heating by applied ICRF waves has been extended to retain important geometrical effects relevant to modeling minority heated tokamak plasmas, thereby improving on the physics base that is standard in presently employed codes. Both the quasilinear theory of ion heating, and the plasma response function important in wave codes have been addressed. In separate studies, it has been shown that highly anisotropic minority heated plasmas can give rise to unstable field fluctuations in some situations. A completely separate series of studies have contributed to the understanding of tokamak confinement physics. Additionally, a diffraction formalism has been produced which will be …
Date:
April 27, 1993
Creator:
Aamodt, R. E.; Catto, P. J.; D`Ippolito, D. A.; Myra, J. R. & Russell, D. A.
Object Type:
Report
System:
The UNT Digital Library
Analysis of neon soft x-ray spectra from short-pulse laser-produced plasmas
We report preliminary results from the analysis of streaked soft x-ray neon spectra obtained from the interaction of a picosecond Nd:glass laser with a gas jet target. In these experiments streaked spectra show prompt harmonic emission followed by longer time duration soft x-ray line emission. The majority of the line emission observed was found to originate from Li- and Be-like Ne and the major transitions in the observed spectra have been identified. Li-like emission lines were observed to decay faster in time than Be-like transitions, suggesting that recombination is taking place. Line ratios of n=4-2 and n=3-2 transitions supported the view that these lines were optically thin and thick, respectively. The time history of Li-like Ne 2p-4d and 2p-3d lines is in good agreement with a simple adiabatic expansion model coupled to a time dependent collisional-radiative code. Further x-ray spectroscopic analysis is underway which is aimed at diagnosing plasma conditions and assessing the potential of this recombining neon plasma as a quasi-steady-state recombination x-ray laser medium.
Date:
April 1, 1993
Creator:
Abare, A. C.; Keane, C. J.; Crane, J. K.; DaSilva, L. B.; Lee, R. W.; Perry, M. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Comparison of a constraint directed search to a genetic algorithm in a scheduling application
Scheduling plutonium containers for blending is a time-intensive operation. Several constraints must be taken into account; including the number of containers in a dissolver run, the size of each dissolver run, and the size and target purity of the blended mixture formed from these runs. Two types of algorithms have been used to solve this problem: a constraint directed search and a genetic algorithm. This paper discusses the implementation of these two different approaches to the problem and the strengths and weaknesses of each algorithm.
Date:
April 1, 1993
Creator:
Abbott, L.
Object Type:
Article
System:
The UNT Digital Library
Multiphoton physics with x-rays: Two photon K-shell ionization of chlorine
A calculation of the two X-ray K-shell photoionization cross section of chlorine will be presented and the feasibility of an experiment will be discussed.
Date:
April 1, 1993
Creator:
Abdallah, J.; Collins, L. A.; Csanak, G.; Kyrala, G. A. & Schappert, G. T.
Object Type:
Article
System:
The UNT Digital Library
[RE: Time for Reform]
Photocopy of a memo from Julie Abel, program associate for the Getty Center for Education in the Arts, to the Regional Institute Directors, Sheila Brown, Phyllis Scott Johnson, Jessie Lovano-Kerr, William McCarter, Joyce Wright, Virginia Gembica, Anne Lindsey, Nancy MacGregor and Susan Rotilie. The memo is in regards to an enclosed copy of the Time for Reform by Susanna Purnell and Paul Hill, published by RAND that Vicki Rosenberg thought the directors would find interesting and beneficial. cc'd on the memo, Jack Davis, Edith Curtis Johnson, Margaret DiBlasio and Nancy Roucher.
Date:
April 7, 1993
Creator:
Abel, Julie
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Julie Anne Abel to Mark Elder, April 5, 1993]
A letter from Julie Anne Abel to Mark Elder about enclosing a grant check from The Getty Center for Education in the Arts to the North Texas Institute for Educators on the Visual Arts. The check is not attached with the document.
Date:
April 5, 1993
Creator:
Abel, Julie Anne
Object Type:
Letter
System:
The UNT Digital Library
The role of catalyst precursor anions in coal gasification. Fifth quarterly report
The aims of the proposed project are to enrich our understanding of the roles of various aqueous soluble catalyst precursor anions on the surface electrical properties of coal and to ascertain the influence of the surface charge on the adsorption, dispersion, and activities of calcium and potassium. These goals will be achieved by impregnating a demineralized North Dakota lignite (PSOC 1482) with calcium or potassium catalyst precursors containing acetate (CH{sub 3}COO{sup {minus}}), chloride (Cl{sup {minus}}), nitrate (NO{sub 3}{sup {minus}}), sulfate (SO{sub 4}{sup 2{minus}}), and carbonate (CO{sub 3}{sup 2{minus}}) anions. Demineralization of the coal has been completed. In the past quarter, the effects of chloride anion on the surface charge properties of the demineralized coal has been studied using calcium or potassium chlorides. Like the compounds investigated previously, increasing anion concentrations produce less negative charge on the coal surface through the interaction of calcium or potassium ions with the surface. To date, Fourier transform infrared studied aimed at an understanding of the interaction between the metal ions (Ca{sup 2+} or {sup K+}) and the coal surface oxygen functionality has not been very informative, most probably due to the high infrared absorption by coal. For this reason, we have procured a resin, …
Date:
April 1, 1993
Creator:
Abotsi, G. M. K.
Object Type:
Report
System:
The UNT Digital Library
Thermal and flow considerations for the 80 K shield of the SSC magnet cryostats
The nominal temperatures in the SSC cryostat range between 4.2 K in the superconducting magnet and 300 K on the cryostat outer wall. To minimize the 4 K heat load, a thermal shield cooled by liquid and vapor nitrogen flows at 84 K and one a 20 K cooled by helium flow are incorporated in the cryostat. Tubes attached to the shields serve as conduits for cryogens. The liquid nitrogen tube in the cryostat is used for cryostat refrigeration and also for liquid distribution around the SSC rings. The second nitrogen line is used to return the vapor to the helium refrigerators for further processing. The nominal GN2 flow from a 4.3-km long cryogenic string (4 sections) to the surface is 64 g/s. The total liquid nitrogen consumption of approximately 5000 g/s will be supplied at one, two or more locations on the surface. The total heat load of the 80 K shield is estimated as 3.2 W/m. About 50% is composed of infrared radiation and remaining 50% by heat conduction through supports, vacuum barriers and other thermal connections between the shield and the 300 K outer wall. The required LN2 flow rate depends on the distribution and circulation schemes. …
Date:
April 1993
Creator:
Abramovich, S.; Yuecel, A.; Demko, J. & Thirumaleshwar, M.
Object Type:
Article
System:
The UNT Digital Library
Comment on "Partitioning of Polycyclic Aromatic Hydrocarbons to Marine Porewater Organic Colloids"
This article provides comments on "Partitioning of Polycyclic Aromatic Hydrocarbons to Marine Porewater Organic Colloids," published in 'Environmental Science and Technology,' 1993.
Date:
April 1993
Creator:
Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
High efficiency shale oil recovery. Fifth quarterly report, January 1, 1993--March 31, 1993
The overall project objective is to demonstrate the high efficiency of the Adams Counter-Current shale oil recovery process. The efficiency will first be demonstrated on a small scale, in the current phase, after which the demonstration will be extended to the operation of a small pilot plant. Thus the immediate project objective is to obtain data on oil shale retorting operations in a small batch rotary kiln that will be representative of operations in the proposed continuous process pilot plant. Although an oil shale batch sample is sealed in the batch kiln from the start until the end of the run, the process conditions for the batch are the same as the conditions that an element of oil shale would encounter in a continuous process kiln. Similar chemical and physical conditions (heating, mixing, pyrolysis, oxidation) exist in both systems.The two most important data objectives in this phase of the project are to demonstrate (1) that the heat recovery projected for this project is reasonable and (2) that an oil shale kiln will run well and not plug up due to sticking and agglomeration. The following was completed this quarter. (1) Twelve pyrolysis runs were made on five different oil shales. …
Date:
April 22, 1993
Creator:
Adams, D. C.
Object Type:
Report
System:
The UNT Digital Library
High efficiency shale oil recovery
The overall project objective is to demonstrate the high efficiency of the Adams Counter-Current shale oil recovery process. The efficiency will first be demonstrated on a small scale, in the current phase, after which the demonstration will be extended to the operation of a small pilot plant. Thus the immediate project objective is to obtain data on oil shale retorting operations in a small batch rotary kiln that will be representative of operations in the proposed continuous process pilot plant. Although an oil shale batch sample is sealed in the batch kiln from the start until the end of the run, the process conditions for the batch are the same as the conditions that an element of oil shale would encounter in a continuous process kiln. Similar chemical and physical conditions (heating, mixing, pyrolysis, oxidation) exist in both systems.The two most important data objectives in this phase of the project are to demonstrate (1) that the heat recovery projected for this project is reasonable and (2) that an oil shale kiln will run well and not plug up due to sticking and agglomeration. The following was completed this quarter. (1) Twelve pyrolysis runs were made on five different oil shales. …
Date:
April 22, 1993
Creator:
Adams, D.C.
Object Type:
Report
System:
The UNT Digital Library
Fifteenth Street News (Midwest City, Okla.), Vol. 21, No. 23, Ed. 1 Friday, April 2, 1993
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 2, 1993
Creator:
Addington, Kathy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Fifteenth Street News (Midwest City, Okla.), Vol. 21, No. 24, Ed. 1 Friday, April 9, 1993
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 9, 1993
Creator:
Addington, Kathy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Fifteenth Street News (Midwest City, Okla.), Vol. 21, No. 25, Ed. 1 Friday, April 16, 1993
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 16, 1993
Creator:
Addington, Kathy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Fifteenth Street News (Midwest City, Okla.), Vol. 21, No. 26, Ed. 1 Friday, April 23, 1993
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 23, 1993
Creator:
Addington, Kathy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Fifteenth Street News (Midwest City, Okla.), Vol. 21, No. 27, Ed. 1 Friday, April 30, 1993
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 30, 1993
Creator:
Addington, Kathy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Application of a CdTe gamma-ray spectrometer to remote characterization of high-level radioactive waste tanks
Small, shielded cadmium telluride (CdTe) semiconductor gamma-ray detectors have been used for in situ radiological characterization of underground high-level radioactive waste tanks. Remote measurements have been made in gamma radiation fields up to 700 R/h. Spectral data have been used to generate qualitative and quantitative radionuclide profiles of high-level radioactive waste tanks. Two electronic spectral enhancement techniques (pulse risetime discrimination and pulse risetime compensation) have been used in order to measure trace isotopes with photopeak energies greater than 662keV in the presence of large amounts of {sup 137}Cs. Spectral resolution of 1.5% for the {sup 137}Cs 662 keV photopeak has been obtained.
Date:
April 1, 1993
Creator:
Addleman, R. S.; Blewett, G. R.; Keele, B. D.; McClellan, C. S.; Subrahmanyam, V. B. & Troyer, G. L.
Object Type:
Report
System:
The UNT Digital Library
Modified Streamflows 1990 Level of Irrigation : Columbia River and Coastal Basins, 1928-1989.
The annual operation plans described in the following sections require detailed system regulation computer model studies. These system regulation studies are necessary to evaluate potential new projects and to develop operational rule curves for the existing system of projects. The objective is to provide a basis for evaluating alternative system regulation scenarios. This provides essential input for optimizing the management of existing projects and planning future projects for the most beneficial use of the water supply and resources in the entire region. Historical streamflows per se are inadequate for system regulation studies because the pattern of observed flow has continually changed with each successive stage of irrigation and e development. The problem, therefore, is to adjust for past operation of storage projects and to determine the necessary adjustments that should be made to recorded flows to reflect current stages of irrigation development. Historical flows which have been adjusted to a common level of irrigation development by correcting for the effects of diversion demand, return flow, and change-of-contents and evaporation in upstream reservoirs and lakes are referred to as modified flows. This report describes the development of irrigation depletion adjustments and modified flows for the 1990 level of development for the …
Date:
April 1, 1993
Creator:
Administration, United States. Bonneville Power & Company, A. G. Crook
Object Type:
Report
System:
The UNT Digital Library
Method to evaluate steering and alignment algorithms for controlling emittance growth
Future linear colliders will likely use sophisticated beam-based alignment and/or steering algorithms to control the growth of the beam emittance in the linac. In this paper, a mathematical framework is presented which simplifies the evaluation of the effectiveness of these algorithms. As an application, a quad alignment that uses beam data taken with the nominal linac optics, and with a scaled optics, is evaluated in terms of the dispersive emittance growth remaining after alignment.
Date:
April 1, 1993
Creator:
Adolphsen, C. & Raubenheimer, T.
Object Type:
Article
System:
The UNT Digital Library
The design and development of a single piece, sandwhich tube coldmass support post for the SSC Collider Dipole Magnets
This paper presents the design and development of the single piece, carbon/epoxy syntactic core sandwich tube support post concept for the 13-m and 15-m Collider Dipole Magnet (CDM). The engineering studies focus on balancing the structural and thermal requirements for the structure, and most importantly the implicit requirement of ``Designing for Producibility.`` Results from these studies, as well as the development program plan, will be presented.
Date:
April 1, 1993
Creator:
Ahmad, A. & Mehle, G.
Object Type:
Article
System:
The UNT Digital Library
A [gamma][sub t]-jump scheme for the Brookhaven AGS
AGS beam losses at transition are now tolerable ([lt]5%), but as the present improvement plans are implemented and the intensity is increased, new mechanisms will become important and the losses will increase. This Note describes studies directed towards minimizing these losses. Werner Hardt has studied these losses at the CERN PS. In particular, he found that by sharply reducing the time spent going through transition he could reduce the losses. Hardt visited Brookhaven in early June, 1986, in order to help us better understand the AGS. As a result of work inspired by his visit, we now believe that intensities of [approximately]5x10[sup 13] circulating protons are attainable in the AGS without significant losses at transition.
Date:
April 23, 1993
Creator:
Ahrens, L.; Auerbach, E.; Hardt, W.; Raka, E.; Ratner, L. & Yamin, P.
Object Type:
Report
System:
The UNT Digital Library