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Actinide Behavior in a Freshwater Pond
Long-term investigations of solution chemistry in an alkaline freshwater pond have revealed that actinide oxidation state behavior, particularly that of plutonium, is complex. The Pu(V,VI) fraction was predominant in solution, but it varied over the entire range reported from other natural aquatic environments, in this case, as a result of intrinsic biological and chemical cycles (redox and pH-dependent phenomena). A strong positive correlation between plutonium (Pu), but not uranium (U), and hydroxyl ion over the observation period, especially when both were known to be in higher oxidation states, was particularly notable. Coupled with other examples of divergent U and Pu behavior, this result suggests that Pu(V), or perhaps a mixture of Pu(V,VI), was the prevalent oxidation state in solution. Observations of trivalent actinide sorption behavior during an algal bloom, coupled with the association with a high-molecular weight (nominally 6000 to 10,000 mol wt) organic fraction in solution, indicate that solution-detritus cycling of organic carbon, in turn, may be the primary mechanism in amercium-curium (Am-Cm) cycling. Sorption by sedimentary materials appears to predominate over other factors controlling effective actinide solubility and may explain, at least partially, the absence of an expected strong positive correlation between carbonate and dissolved U. 49 references, …
Date:
January 1, 1983
Creator:
Trabalka, J. R.; Bogle, M. A. & Scott, T. G.
Object Type:
Article
System:
The UNT Digital Library
Active metasomatism in the Cerro Prieto geothermal system, Baja California, Mexico: a telescoped low pressure/temperature metamorphic facies series
In the Cerro Prieto geothermal field, carbonate-cemented, quartzofeldspathic sediments of the Colorado River delta are being actively metasomatized into calc-silicate metamorphic rocks by reaction with alkali chloride brines between 200/sup 0/ and 370/sup 0/C, low fluid and lithostatic pressures, and low oxygen fugacities. Petrologic investigations of drill cores and cutting from over 50 wells in this field identified a prograde series of calc-silicate mineral zones which include as index minerals: wairakite, epidote, prehnite, and clinopyroxene. Associated divariant mineral assemblages are indicative of a very low pressure/temperature metamorphic facies series which encompasses the clay-carbonate, zeolite, greenschist, and amphibolite facies. This hydrothermal metamorphic facies series, which is becoming increasingly recognized in other active geothermal systems, is characterized by temperature-telescoped dehydration and decarbonation mineral equilibria. Its equivalent should now be sought in fossil hydrothermal systems.
Date:
January 1, 1983
Creator:
Schiffman, P.; Elders, W. A.; Williams, A. E.; McDowell, S. D. & Bird, D. K.
Object Type:
Report
System:
The UNT Digital Library
Active sites in char gasification. First quarterly progress report, September 1983-December 1983
This report reviews the background and motivation for this work, and discusses some initial scoping studies on chars similar to the model compounds to be used in later phases of the work. Some preliminary synthetic methodologies for model compounds are presented. 69 references.
Date:
January 1, 1983
Creator:
Suuberg, E. M.; Calo, J. M.; Wojtowicz, M. & Lilly, W.
Object Type:
Report
System:
The UNT Digital Library
ACTVE News, Volume 14, Number 1, January 1983
Newsletter issued by the Advisory Council for Technical-Vocational Education in Texas discussing news, events, and other relevant information related to technical and vocational education for adults in Texas.
Date:
January 1983
Creator:
Advisory Council for Technical-Vocational Education in Texas
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Adams Southeast Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
1983
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Adaptive Collocation Method For Simultaneous Heat and Mass Diffusion with Phase Change
In post-accident heat removal applications the use of a lead slab is being considered for protecting a porous bed of steel shot in ex-vessel cavity from direct impingement of molten steel or fuel as released from reactor vessel following a hypothetical core disassembly accident in an LMFBR. The porous bed is provided to increase the coolability of the fuel debris by the sodium coolant. The present study is carried out to determine melting rates of a lead slab of various thicknesses by contact with sodium coolant and to evaluate the extent of penetration and the mixing rates of molten lead into liquid sodium by molecular diffusion alone. The study shows that these two calculations cannot be performed simultaneous without the use of adaptive coordinates which cause considerable stretching of the physical coordinates for mass diffusion. Because of the large difference in densities of these two liquid metals, the traditional constant density approximation for the calculation of mass diffusion cannot be used for studying their interdiffusion. The use of orthogonal collocation method along with adaptive coordinates produces extremely accurate results which are ascertained by comparing with the existing analytical solutions for concentration distribution for the case of constant density approximation and …
Date:
January 1, 1983
Creator:
Chawla, T. C.; Pedersen, D. R.; Leaf, G.; Minkowycz, W. J. & Shouman, A. R.
Object Type:
Article
System:
The UNT Digital Library
Advanced nuclear data for radiation-damage calculations
Accurate calculations of atomic displacement damage in materials exposed to neutrons require detailed spectra for primary recoil nuclei. Such data are not available from direct experimental measurements. Moreover, they cannot always be computed accurately starting from evaluated nuclear data libraries such as ENDF/B-V that were developed primarily for neutron transport applications, because these libraries lack detailed energy-and-angle distributions for outgoing charged particles. Fortunately, a new generation of nuclear model codes is now available that can be used to fill in the missing spectra. One example is the preequilibrium statistical-model code GNASH. For heating and damage applications, a supplementary code called RECOIL has been developed. RECOIL uses detailed reaction data from GNASH, together with angular distributions based on Kalbach-Mann systematics to compute the energy and angle distributions of recoil nuclei. The energy-angle distributions for recoil nuclei and outgoing particles are written out in the new ENDF/B File 6 format. The result is a complete set of nuclear data that can be used to calculate displacement-energy production, heat production, gas production, transmutation, and activation. Sample results for iron are given and compared to the results of conventional damage models such as those used in NJOY.
Date:
January 1, 1983
Creator:
MacFarlane, R.E. & Foster, D.G. Jr.
Object Type:
Article
System:
The UNT Digital Library
Advanced performance fusion engineering device based on low safety factor and current drive (FED-A)
The FED-A study aims to quantify the potential improvement in cost-effectiveness of the Fusion Engineering Device (FED) by assuming low safety factor q at the plasma edge and noninductive current drive. The FED-A performance objectives (ignition, neutron wall load, and power-reactor-like operation) are set to be equal to or better than those of the FED Baseline. The results show that assuming magnetohydrodynamic (MHD) q/sub psi/ (edge) to be 1.8 permits reduction in device size and plasma current and leads to a 30% reduction in direct cost. A closely fitted, 1.5-cm-thick, continuous water-cooled shell made of the copper alloy AMAX-MZC (0.6 Cr, 0.1 Zr, 0.03 Mg) is proposed to provide a 0.5-s time constant, to help avoid disruption when q/sub psi/ passes near 2, and to mitigate disruption impact. The lower hybrid wave current drive in a cyclic density operation is proposed to achieve a quasi-steady-state operation permitting a design with low toroidal loop voltage and a 1000-s burn time.
Date:
January 1, 1983
Creator:
Peng, Y. K. M. & Rutherford, P. H.
Object Type:
Article
System:
The UNT Digital Library
Advanced research in solar-energy storage
The Solar Energy Storage Program at the Solar Energy Research Institute is reviewed. The program provides research, systems analyses, and economic assessments of thermal and thermochemical energy storage and transport. Current activities include experimental research into very high temperature (above 800/sup 0/C) thermal energy storage and assessment of novel thermochemical energy storage and transport systems. The applications for such high-temperature storage are thermochemical processes, solar thermal-electric power generation, cogeneration of heat and electricity, industrial process heat, and thermally regenerative electrochemical systems. The research results for five high-temperature thermal energy storage technologies and two thermochemical systems are described.
Date:
January 1, 1983
Creator:
Luft, W.
Object Type:
Article
System:
The UNT Digital Library
Advanced test accelerator (ATA), a 50 MeV, 10 kA induction linac
The ATA is an induction accelerator designed to produce 70 ns pulses of electrons at currents of 10 kA and energies in excess of 50 MeV. The accelerator is capable of operating at an average rate of 5 Hz or at 1 kHz for ten pulses. The parameters were chosen primarily to provide the experimental basis for advancing the understanding of electron beam propagation physics. The 85 m accelerator has been under construction for the past four years and has adopted mainly an improved version of the ETA technology to satisfy the required parameters. Initial operation of the facility and the energy conversion system from primary power to axial electric field will be described; recent advances in magnetic switching which have been incorporated in the innector will also be discussed.
Date:
January 1, 1983
Creator:
Reginato, L.
Object Type:
Article
System:
The UNT Digital Library
Advances in room-temperature solid-state gamma-ray spectrometry
This article presents a review and analysis of different concepts of gamma-ray spectrometry using room-temperature solid-state detectors. The classical approach involving the use of a charge-sensitive preamplifier and attempting to collect all the ionization charge produced by the gamma ray is analyzed and discussed in terms of the charge transport parameters of the most promising compound semiconductor materials. It is concluded that compound semiconductor detector materials having a large disparity between the ..mu.. tau products for electrons and holes (such as HgI/sub 2/ and CdTe) will have rather poor energy resolution if the classical method of spectrometry requiring full charge collection is employed. 30 references.
Date:
January 1, 1983
Creator:
Iwanczyk, Jan S.
Object Type:
Article
System:
The UNT Digital Library
Advances in transmission x-ray optics
Recent developments in x-ray optics are reviewed. Specific advances in coded aperture imaging, zone plate lens fabrication, time and space resolved spectroscopy, and CCD x-ray detection are discussed.
Date:
January 1, 1983
Creator:
Ceglio, N.M.
Object Type:
Article
System:
The UNT Digital Library
Advantages and limitations of the SETS method. [PWR; BWR]
The stability-enchancing two-step (SETS) method has been used successfully in the Transient Reactor Analysis Code (TRAC) for several years. The method consists of a basic semi-implicit step combined with a stabilizer step that, taken together, eliminate the material Courant stability limit associated with standard semi-implicit numerical methods. This approach toward stability requires significantly fewer computational operations than a fully implicit method, but currently maintains the first-order accuracy in space and time of its semi-implicit predecessors.
Date:
January 1, 1983
Creator:
Mahaffy, J.H.
Object Type:
Article
System:
The UNT Digital Library
Advantages of spatial and temporal segmentation for detectors at high-luminosity c-w colliders
A major detector problem at high energy colliders independent of the luminosity is the ability to resolve particles inside jets. Only in very spacial cases, e.g., UAl W+- production with P/sub T/ = M/sub W//2 will enough of the signal be clear of jets, so that events with tracks in jets can be summarily rejected. Eventually, detectors will have to cope with tracks in jets. The high track density requires good track-pair resolution and efficiency, which implies wire chambers with drift distances of 2 mm or less, independent of the luminosity. The small drift distances required by the jet physics are very helpful at high luminosities since the maximum drift time of 40 nsec limits the pile-up to an average of 2 events at a luminosity of 10/sup 33/ cm/sup -2/sec/sup -1/. The segmentation of calorimeters is also set by jet physics and the desire to resolve and measure collimated jets. Characteristics of some segmented detectors are briefly discussed. (WHK)
Date:
January 1, 1983
Creator:
Tannenbaum, Michael J.
Object Type:
Article
System:
The UNT Digital Library
AEM/STEM analysis of vapor-deposited multilayered laser targets
S(TEM) examinations were made to augment other types of measurements of absolute density. The structure of the 5 ..mu..m thick layers of aluminum and gold on aluminum laminate gold substrate was examined to establish film integrity, to characterize the microstructure, as well as to estimate the surface roughness of this multilayer material.
Date:
January 1, 1983
Creator:
Johnson, K. A.; Staudhammer, K. P.; Reeves, G. A. & Vesser, L. R.
Object Type:
Article
System:
The UNT Digital Library
Aerial Photograph of Abilene, Texas (South 27th & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of South 27th Street and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Abilene, Texas (South 27th & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of South 27th Street and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Abilene, Texas (South 27th & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of South 27th Street and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Abilene, Texas (South 27th & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of South 27th Street and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Abilene, Texas (South 27th & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of South 27th Street and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Abilene, Texas (South 27th & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of South 27th Street and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Abilene, Texas (Southwest Drive & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of Southwest Drive and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Abilene, Texas (Southwest Drive & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of Southwest Drive and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History
Aerial Photograph of Abilene, Texas (Southwest Drive & US 83/84)
An aerial photograph of Abilene, Texas, centering on the area around the intersection of Southwest Drive and US 83/84. The photo was taken by Abilene photographer Don Hutcheson. Photographer's Note: Goebel, Aeriels of Furrs Cafeteria Area
Date:
1983
Creator:
Hutcheson, Don
Object Type:
Photograph
System:
The Portal to Texas History