NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts (open access)

NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts

The primary objective of the project is to examine the relations between the catalytic and magnetic properties of the copper-cobalt higher alcohol synthesis catalysts. We have undertaken to investigate the magnetic character by studying the Nuclear Quadrupole resonance of copper and (Zerofield) Nuclear Magnetic Resonance of cobalt in copper cobalt catalysts.
Date: December 17, 1991
Creator: unknown
System: The UNT Digital Library
Thermally Induced Structural Changes in Coal Combustion (open access)

Thermally Induced Structural Changes in Coal Combustion

The effect of particle shape on char burnout is investigated in the limit of shrinking core combustion. As a first step, the particle temperature is assumed to proceed in the shrinking core regime and under conditions of negligible Stefan flow. The problem then reduces to calculating the oxygen concentration field around a non-spherical particle with the oxidation reaction taking place on the external surface. This problem has been addressed by an analytical technique and a numerical technique. An analytical technique known as domain perturbation'' was used to examine the change due to reaction in the shape of a slightly nonspherical, but axisymmetric, particle. It was found that the aspect ratio always increases with conversion, i.e., the particle becomes less spherical. A numerical technique, based on the boundary integral'' method was developed to handle the case of an axisymmetric particle with otherwise arbitrary shape. Numerical results are presented which again show the aspect ratio to increase with conversion. 8 refs.
Date: January 17, 1990
Creator: Gavalas, G. R. & Flagan, R. C.
System: The UNT Digital Library
The Michigan regulatory incentives study for electric utilities (open access)

The Michigan regulatory incentives study for electric utilities

This is the final report of Phase I of the Michigan Regulatory Incentives Study for Electric Utilities, a three-phase review of Michigan's regulatory system and its effects on resource selection by electric utilities. The goal of Phase I is to identify and analyze financial incentive mechanisms that encourage selection of resources in accord with the principles of integrated resource planning (IRP) or least-cost planning (LCP). Subsequent study phases will involve further analysis of options and possibly a collaborative formal effort to propose regulatory changes. The Phase I analysis proceeded in three steps: (1) identification and review of existing regulatory practices that affect utilities; selection of resources, particularly DSM; (2) preliminary analysis of ten financial mechanisms, and selection of three for further study; (3) detailed analysis of the three mechanisms, including consideration of how they could be implemented in Michigan and financial modeling of their likely impacts on utilities and ratepayers.
Date: June 17, 1991
Creator: Reid, M.W. & Weaver, E.M. (Barakat and Chamberlin, Inc., Oakland, CA (United States))
System: The UNT Digital Library
Development of improved iron Fischer-Tropsch catalysts (open access)

Development of improved iron Fischer-Tropsch catalysts

The objective of proposed research is development of catalysts with enhanced slurry phase activity and better selectivity to fuel range products, through a more detailed understanding and systematic studies of the effects of pretreatment procedures and promoters/binders (silica) on catalyst performance.
Date: June 17, 1990
Creator: Bukur, D.B.
System: The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning (open access)

Control of pyrite surface chemistry in physical coal cleaning

To better understand the flotation behavior of coal pyrite, studies have been initiated to characterize the floatability of coal pyrite and mineral pyrite. The hydrophobicity of coal material pyrite was examined over a range of pH and oxidation times. The results indicate that surface oxidation plays an important role in coal and mineral pyrite hydrophobicity. The hydrophobicity of mineral pyrite decreases with increasing oxidation time (20 min. to 5 hr.) and increasing pH (pH 4.6 to 9.2), with maximum depression occurring at pH 9.2. However, coal pyrite exhibited low floatability, even at the lowest oxidation time, over the entire pH range. X-ray photoelectron spectroscopy (XPS) results suggest the growth of an oxidized iron layer as being responsible for the deterioration in floatability, while a sulfur-containing species present on the sample surfaces may promote floatability. Preliminary studies of the effect of frother indicate an enhancement in the floatability of both coal and mineral pyrite over the entire pH range.
Date: January 17, 1990
Creator: Luttrell, G. H.; Yoon, R. H.; Zachwieja, J. & Lagno, M.
System: The UNT Digital Library
Development of Rotating Shadowband Spectral Radiometers and GCM Radiation Code Test Data Sets in Support of ARM (open access)

Development of Rotating Shadowband Spectral Radiometers and GCM Radiation Code Test Data Sets in Support of ARM

Two tasks are included in the second year of this project. One task continues the collection of high quality data sets for the testing of radiation codes within climate models. The other task involves the development of accurate spectral instruments for the measurement of shortwave radiation. A third task was completed in the second half of the first year of the project and will be briefly summarized.
Date: March 17, 1992
Creator: Michalsky, J. & Harrison, L.
System: The UNT Digital Library
Historical monthly energy review, 1973--1988. [Contains glossary] (open access)

Historical monthly energy review, 1973--1988. [Contains glossary]

This publication presents monthly and annual data from 1973 through 1988 on production, consumption, stocks, imports, exports, and prices of the principal energy commodities in the United States. Also included are data on international production of crude oil, consumption of petroleum products, petroleum stocks, and production of electricity from nuclear-powered facilities. 55 tabs.
Date: September 17, 1991
Creator: unknown
System: The UNT Digital Library
Fundamental Studies of Retrograde Reactions in Direct Liquefaction (open access)

Fundamental Studies of Retrograde Reactions in Direct Liquefaction

The overall objective of the program was to improve the understanding of retrograde reactions and their dependencies on coal rank and structure, and/or coal modifications and reaction conditions. Because retrograde reactions are competitive with bond breaking reactions, an understanding of both is required to shift the competition in favor of the latter. Related objectives were to clarify the conflicting observations reported in literature on such major topics as the role of oxygen groups in retrograde reactions and to provide a bridge from very fundamental studies on pure compounds to phenomenological studies on actual coal. This information was integrated into the FG-DVC model, which was improved and extended to the liquefaction context.
Date: December 17, 1991
Creator: Serio, M. A.; Solomon, P. R.; Kroo, E.; Charpenay, S. & Bassilakis, R.
System: The UNT Digital Library
Geothermal Heat Pump Benchmarking Report (open access)

Geothermal Heat Pump Benchmarking Report

A benchmarking study was conducted on behalf of the Department of Energy to determine the critical factors in successful utility geothermal heat pump programs. A Successful program is one that has achieved significant market penetration. Successfully marketing geothermal heat pumps has presented some major challenges to the utility industry. However, select utilities have developed programs that generate significant GHP sales. This benchmarking study concludes that there are three factors critical to the success of utility GHP marking programs: (1) Top management marketing commitment; (2) An understanding of the fundamentals of marketing and business development; and (3) An aggressive competitive posture. To generate significant GHP sales, competitive market forces must by used. However, because utilities have functioned only in a regulated arena, these companies and their leaders are unschooled in competitive business practices. Therefore, a lack of experience coupled with an intrinsically non-competitive culture yields an industry environment that impedes the generation of significant GHP sales in many, but not all, utilities.
Date: January 17, 1997
Creator: unknown
System: The UNT Digital Library
Electric power annual 1989. [Contains glossary] (open access)

Electric power annual 1989. [Contains glossary]

This publication presents a summary of electric utility statistics at the national, regional and state levels. The Industry At A Glance'' section presents a profile of the electric power industry ownership and performance; a review of key statistics for the year; and projections for various aspects of the electric power industry through 2010. Subsequent sections present data on generating capability, including proposed capability additions; net generation; fossil-fuel statistics; electricity sales, revenue and average revenue per kilowatthour sold; financial statistics; environmental statistics; and electric power transactions. In addition, the appendices provide supplemental data on major disturbances and unusual occurrences. Each section contains related text and tables and refers the reader to the appropriate publication that contains more detailed data on the subject matter. 24 figs., 57 tabs.
Date: January 17, 1991
Creator: unknown
System: The UNT Digital Library
Synchrotron radiation power calculations and bending radius choice for LER (Low Energy Ring) (open access)

Synchrotron radiation power calculations and bending radius choice for LER (Low Energy Ring)

This note will discuss ways of choosing a bending radius and synchrotron radiation absorber design. We would like to decrease the synchrotron radiation power density on the absorber's surfaces, yet we would like to reduce the LER's bending radius for better matching with the HER (beam-beam interaction criteria). We will consider two cases, both based on the PEP structure. One with 96 periods, containing 1 bending magnet per period and the other 2 bends per period. The case of synchrotron radiation absorbers outside of the bending magnet will considered also. 2 refs., 13 figs.
Date: August 17, 1990
Creator: Alexandrov, A.; Hutton, A. & Logatchev, P.
System: The UNT Digital Library
(Instrumentation and controls technology and reactor operational safety) (open access)

(Instrumentation and controls technology and reactor operational safety)

While on vacation, the traveler participated as a co-chairman of a panel of instrumentation and controls specialists visiting nuclear establishments in Europe. The purpose of the visit was to assess the status of instrumentation and controls technology for nuclear power in Europe. A list of the sites visited and the personnel contacted is included in this trip report. The visit was sponsored by Loyola College working under contract to the National Science Foundation. All costs were paid by Loyola College, for whom the traveler was a consultant. This was an outside activity approved by DOE. The traveler was surprised by the high level of automaton present in the German Konvoi nuclear power plants built by Siemens AG KWU. The claim was that this was done to improve the safety of the plant by keeping the operator out of the loop'' for the first 30 minutes of some transients or accidents. The traveler was also surprised by the high level of man-machine interface R D in the USSR.
Date: December 17, 1990
Creator: White, J.D.
System: The UNT Digital Library
Electric power monthly, September 1990. [Glossary included] (open access)

Electric power monthly, September 1990. [Glossary included]

The purpose of this report is to provide energy decision makers with accurate and timely information that may be used in forming various perspectives on electric issues. The power plants considered include coal, petroleum, natural gas, hydroelectric, and nuclear power plants. Data are presented for power generation, fuel consumption, fuel receipts and cost, sales of electricity, and unusual occurrences at power plants. Data are compared at the national, Census division, and state levels. 4 figs., 52 tabs. (CK)
Date: December 17, 1990
Creator: unknown
System: The UNT Digital Library
Theoretical approach for enhanced mass transfer effects in duct flue gas desulfurization processes (open access)

Theoretical approach for enhanced mass transfer effects in duct flue gas desulfurization processes

Novel techniques designed for the enhancement of Ca(OH){sub 2} utilization in dry-sorbent injection (DSI) and duct-spray drying (DSD) were investigated in the Long Time Differential Reactor (LTDR), Short Time Differential Reactor (STDR), and 50-cfm pilot plant. At 2000-ppm SO{sub 2} and 60 percent relative humidity, the presence of up to 30-percent initial free moisture significantly increased sorbent reactivity with SO{sub 2}, compared to sorbent with equilibrium amount of moisture. The conversion decreased when the initial free moisture increased beyond 30--50 percent. The initial free moisture content and corresponding level of maximum sorbent conversion with SO{sub 2} varied with the surface area of the sorbent. Sorbent moisture capacity tests indicated that agglomeration of damp calcium silicate sorbent was a function of sorbent pore volume. Critical moisture content was increasing with specific surface area. Very little improvement in SO{sub 2} removal was obtained by DSI recycle operation downstream of humidification. Significant enhancement was achieved by DSI recycle upstream of humidification. Grinding of DSI solids with and without fly ash resulted in significant increase of surface area and pore volume and resulting reactivity with SO{sub 2}. Organic buffer additives were tested as potential enhancement of Ca(OH){sub 2} utilization during the DSD process. Bench-scale …
Date: September 17, 1991
Creator: Jozewicz, Wojciech (Acurex Corp., Research Triangle Park, NC (United States). Environmental Systems Div.) & Rochelle, G.T. (Texas Univ., Austin, TX (United States). Dept. of Chemical Engineering)
System: The UNT Digital Library
NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts (open access)

NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts

Our previous studies (1,2) on the zerofield NMR spectra of Cu/Co catalysts revealed that the method of preparation sensitively influences the magnetic character of the Catalyst. Catalytic studies of the earlier investigators also (3) show similar influence on the product selectivity and indicate reproducible performance is critically dependent on the control and rigor of the preparation technique. To compliment the NMR results, we have made a thorough investigation of the Hysteresis character of the Cu/Co catalysts with the metal ratio varying from 0.2 to 4.0.
Date: December 17, 1991
Creator: unknown
System: The UNT Digital Library
Electric power monthly, January 1991. [Contains glossary] (open access)

Electric power monthly, January 1991. [Contains glossary]

This publication provides monthly statistics at the national, Census division, and state levels for net generation, fuel consumption, fuel stocks, quantity and quality of fuel, cost of fuel, electricity sales, and average revenue per kilowatthour of electricity sold. Data on net generation are also displayed at the North American Electric Reliability Council (NERC) region level. Additionally, company and plant level information are published in the EPM on capability of new plants, net generation, fuel consumption, fuel stocks, quantity and quality of fuel, and cost of fuel. 4 figs., 48 tabs.
Date: January 17, 1991
Creator: unknown
System: The UNT Digital Library
Millimeter-wave, megawatt gyrotron development for ECR (electron cyclotron resonance) heating applications (open access)

Millimeter-wave, megawatt gyrotron development for ECR (electron cyclotron resonance) heating applications

To address the electron cyclotron heating requirements of planned fusion experiments such as the International Thermonuclear Experimental Reactor (ITER) and the Compact Ignition Tokamak (CIT), Varian is developing gyrotrons at frequencies ranging from 100--300 GHz with output power capabilities up to 1 MW CW. Experimental gyrotrons have been built at frequencies between 100--140 GHz, and a study program has addressed the critical elements of designing 280--300 GHz gyrotrons capable of generating CW power levels up to 1 MW. Initial test vehicles at 140 GHz have utilized TE{sub 15,2,1} interaction cavities, and have been designed to generate short-pulse (up to 20 ms) power levels of 1 MW and up to 400 kW CW. Recently, short-pulse power levels of 1040 kW at 38% efficiency have been obtained and average powers of 200 kW have been achieved. Long-pulse operation has been extended to pulse durations of 0.5 seconds at power levels of 400 kW. Gyrotron oscillators capable of generating output powers of 500 kW CW at a frequency of 110 GHz have recently been designed and a prototype is currently being tested. Design work for a 1 MW CW gyrotron at 110 GHz, is in progress. The 1 MW CW tube will employ …
Date: September 17, 1990
Creator: Jory, H.; Felch, K.; Hess, C.; Huey, H.; Jongewaard, E.; Neilson, J. et al.
System: The UNT Digital Library
Physics History Books in the Fermilab Library (open access)

Physics History Books in the Fermilab Library

Fermilab is a basic research high-energy physics laboratory operated by Universities Research Association, Inc. under contract to the U.S. Department of Energy. Fermilab researchers utilize the Tevatron particle accelerator (currently the worlds most powerful accelerator) to better understand subatomic particles as they exist now and as they existed near the birth of the universe. A collection review of the Fermilab Library monographs was conducted during the summers of 1998 and 1999. While some items were identified for deselection, the review proved most fruitful in highlighting some of the strengths of the Fermilab monograph collection. One of these strengths is history of physics, including biographies and astrophysics. A bibliography of the physics history books in the collection as of Summer, 1999 follows, arranged by author. Note that the call numbers are Library of Congress classification.
Date: September 17, 1999
Creator: Tompson., Sara
System: The UNT Digital Library
Water use, productivity and interactions among desert plants (open access)

Water use, productivity and interactions among desert plants

Productivity, stability, and competitive interactions among ecosystem components within aridlands are key processes related directly to water in deserts. This project assumes that integrated aspects of plant metabolism provide insight into the structure and function of plant communities and ecosystems. While it is difficult to extrapolate from instantaneous physiological observations to higher scales, such as whole plant performance or to the interactions between plants as components of ecosystems, several key aspects of plant metabolism are scalable. Analyses of stable isotopic composition in plant tissues at natural abundance levels provide a useful tool that can provide insight into the consequences of physiological processes over temporal and spatial scales. Some plant processes continuously fractionate among light and heavy stable isotopic forms of an element; over time this results in integrated measures of plant metabolism. For example, carbon isotope fractionation during photosynthesis results in leaf carbon isotopic composition that is a measure of the set-point for photosynthetic metabolism and of water-use efficiency. Thus it provides information on the temporal scaling of a key physiological process.
Date: November 17, 1992
Creator: Ehleringer, J.R.
System: The UNT Digital Library
Separation techniques for the clean-up of radioactive mixed waste for ICP-AES/ICP-MS analysis (open access)

Separation techniques for the clean-up of radioactive mixed waste for ICP-AES/ICP-MS analysis

Two separation techniques were investigated for the clean-up of typical radioactive mixed waste samples requiring elemental analysis by Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) or Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). These measurements frequently involve regulatory or compliance criteria which include the determination of elements on the EPA Target Analyte List (TAL). These samples usually consist of both an aqueous phase and a solid phase which is mostly an inorganic sludge. Frequently, samples taken from the waste tanks contain high levels of uranium and thorium which can cause spectral interferences in ICP-AES or ICP-MS analysis. The removal of these interferences is necessary to determine the presence of the EPA TAL elements in the sample. Two clean-up methods were studied on simulated aqueous waste samples containing the EPA TAL elements. The first method studied was a classical procedure based upon liquid-liquid extraction using tri-n- octylphosphine oxide (TOPO) dissolved in cyclohexane. The second method investigated was based on more recently developed techniques using extraction chromatography; specifically the use of a commercially available Eichrom TRU[center dot]Spec[trademark] column. Literature on these two methods indicates the efficient removal of uranium and thorium from properly prepared samples and provides considerable qualitative information on the extraction behavior of …
Date: March 17, 1993
Creator: Swafford, A.M. & Keller, J.M.
System: The UNT Digital Library
Frequency spectrum generated by AGS Booster power swing, heavy ion cycle (open access)

Frequency spectrum generated by AGS Booster power swing, heavy ion cycle

LILCO is studying the effects of the AGS Booster power swing on its power grid. The study is being conducted by GE systems Development and Engineering, Schenectady, New York. In notes, dates November 10, 1987, prepared for a GE-LILCO Progress Review Meeting, the author notes LILCO system resonances that are excited by the heavy ion cycle. The data used by GE for their study, is the power flow required for continuous operation of the Booster, namely a continuous 13MW Power swing and a period of one second. The data used by GE came from BNL reports, used to analyze the power line flicker generated by this pulsating load. It is a worse case study and does not represent the Booster cycle. The Booster must be synchronized with the AGS, which is operated with a period of 3 seconds, when accelerating heavy ions. Thus the Booster duty cycle is 1/3 with a peak power swing of 13MW. The time of one second used to cycle the Booster magnets is arbitrary and can be increased to a maximum of three seconds. The peak power swing and the power spectrum are modified by the Booster duty cycle and period. The spectrum is critical …
Date: July 17, 1992
Creator: Meth, M. & Ratti, A.
System: The UNT Digital Library
[Computer simulated images of radiopharmaceutical distributions in anthropomorphic phantoms] (open access)

[Computer simulated images of radiopharmaceutical distributions in anthropomorphic phantoms]

We have constructed an anatomically correct human geometry, which can be used to store radioisotope concentrations in 51 various internal organs. Each organ is associated with an index number which references to its attenuating characteristics (composition and density). The initial development of Computer Simulated Images of Radiopharmaceuticals in Anthropomorphic Phantoms (CSIRDAP) over the first 3 years has been very successful. All components of the simulation have been coded, made operational and debugged.
Date: May 17, 1991
Creator: unknown
System: The UNT Digital Library
Pelletizing/reslurrying as a means of distributing and firing clean coal (open access)

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: March 17, 1992
Creator: Conkle, H.N.
System: The UNT Digital Library
Spectrum analysis of the power line flicker induced by the electrical test of the prototype Booster dipole (open access)

Spectrum analysis of the power line flicker induced by the electrical test of the prototype Booster dipole

Testing of the prototype Booster dipole magnet at full current produced measurable disturbances of the beam position at the National Synchrotron Light Source. Power for the magnet and the NSLS are distributed from three substation transformers at Temple Place. Normally the substation configuration is for two independent 13.8 KV buses, derived from the 69 KV LILCO distribution. The buses are connected through a circuit breaker that is normally open circuited. Power for the magnet test is derived from one of the 13.8 KV buses and power for the NSLS is derived from the second bus. Coupling of the pulsating magnet load and the NSLS is at the 69 KV level. However, on the days that the interference was first observed at the NSLS only one-half of the substation transformers at Temple Place were in service. The 13.8 KV tie breaker was closed and the full substation load was supplied from this common bus. Thus the coupling between the pulsating magnet load and the NSLS was at the 13.8 KV level. Establishing the normal two bus configurations at Temple Place appeared to reduce the disturbance. These events suggested a controlled experiment to measure the magnet power swing and the induced powerline …
Date: July 17, 1992
Creator: Meth, M.
System: The UNT Digital Library