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578 Matching Results
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Controlled Synthesis of Polyenes by Catalytic Methods. Progress Report for the period December 1, 1989 - November 30, 1992
A more direct approach to polyenes by the direct polymerization of acetylenes has been achieved. We were able to show that polymerization of acetylene itself can be controlled with a well- characterized alkylidene catalyst, but only if a base such as quinuclidine is present in order to slow down the rate of propagation relative to initiation. (Quinuclidine may also stabilize vinylalkylidene intermediates formed in the reaction). Unfortunately, living polyenes'' were no more stable than isolated polyenes, and so this approach had its limitations. Direct polymerization of acetylene by Mo(CH-t-Bu)(NAr)(O-t-Bu){sub 2} was more successful, but inherent polyene instability was still a problem. The most important result of the past grant period is the finding that dipropargyl derivatives (HC=CCH{sub 2}XCH{sub 2}C=CH; X = CH{sub 2}, C(CO{sub 2}R){sub 2}, SiR{sub 2}, etc.), which have been reported to be cyclopolymerized by various classical catalysts by as yet unknown mechanisms, are polymerized by Mo(CH-t-Bu)(NAr)(OCMe(CF{sub 3}){sub 2}){sub 2} in dimethoxyethane. We speculate that intramolecular formation of a five-membered ring in the product of {alpha} addition is fast enough to yield another terminal alkylidene on the time scale of the polymerization reaction, while a six-membered ring is formed in a reaction involving a more reaction terminal alkylidene. …
Date:
November 30, 1992
Creator:
Schrock, R. R.
Object Type:
Report
System:
The UNT Digital Library
An automated tool for evaluating compliance and providing assistance with building energy standards during design
In an effort to encourage the maximum cost-effective level of energy efficiency in new building design, energy-efficiency standards have become more location-specific and performance-based. As a result, standards often provide more than one path for ensuring and demonstrating that a design complies, but at the cost of increased complexity. In addition, the burden of remedying a noncompliant design rests on the designers' knowledge and experience, with only general guidance provided by the standards. As part of efforts in the US Department of Energy's (DOE's) Advanced Energy Design and Operation Technologies (AEDOT) project, a team at DOE's Pacific Northwest Laboratory is developing a computer program known as the Energy Standards Intelligent Design Tool (ES-IDT). The ES-IDT is one component of a prototype computer-based building design environment. It performs automatic compliance checking for parts of ASHRAE/IES Standard 90.1-1989 and provides designers assistance in bringing noncomplying designs into compliance. This paper describes the ES-IDT, the functions it provides, and how it is integrated into the design process via the AEDOT prototype building design environment. 9 refs.
Date:
April 30, 1992
Creator:
Quadrel, R.W.; Brambley, M.R. & Stratton, R.C.
Object Type:
Article
System:
The UNT Digital Library
Selective flotation of fossil resin from western coal
Economic analysis of this fossil resin project mainly focused on the flotation plant which is intended to be designed with data obtained from the current proof-of-concept flotation test program. It is believed that the analysis of this step is fairly accurate. The other two economic aspects of fossil in resin recovery/utilization are refining and marketing. Cost data used for refining were from an estimated base and are believed to have a large variance. Marketing data used were obtained from two independent marketing studies which were made available on confidentiality basis. Nevertheless, the data used are believed to be fairly accurate with respect to the market potential.
Date:
March 30, 1992
Creator:
Jensen, G. F. & Miller, J. D.
Object Type:
Report
System:
The UNT Digital Library
ARTI Refrigerant Database
The Refrigerant Database consolidates and facilitates access to information to assist industry in developing equipment using alternative refrigerants. The underlying purpose is to accelerate phase out of chemical compounds of environmental concern. The database provides bibliographic citations and abstracts for publications that may be useful in research and design of air- conditioning and refrigeration equipment. The complete documents are not included, though some may be added at a later date. The database identifies sources of specific information on R-32, R-123, R-124, R- 125, R-134a, R-141b, R142b, R-143a, R-152a, R-290 (propane), R-717 (ammonia), ethers, and others as well as azeotropic and zeotropic blends of these fluids. It addresses polyalkylene glycol (PAG), ester, and other lubricants. It also references documents addressing compatibility of refrigerants and lubricants with metals, plastics, elastomers, motor insulation, and other materials used in refrigerant circuits.
Date:
April 30, 1992
Creator:
Calm, J.M.
Object Type:
Report
System:
The UNT Digital Library
Theoretical and experimental studies of elementary physics
The experimental high energy physics program is directed toward the execution of experiments that probe the basic constituents of matter and the forces between them. These experiments are carried out at national and international accelerator facilities. At the current time, we are primarily concentrating on the following projects: Direct photon production in hadronic reactions (Fermilab E706); Production of hybrid mesons in the nuclear Coulomb field; The D-Zero experiment at the Tevatron collider; Deep inelastic neutrino- and electron-nucleon scattering at FNAL and SLAC; Nonlinear QED at critical field strengths at SLAC; The Experiments at KEK (AMY, 17keV neutrino); The CDF experiment at the Tevatron collider; and SSC-related detector R D on scintillating tile- and diamond-based calorimetry and microstrip tracking detectors.
Date:
April 30, 1992
Creator:
Bodek, A.; Ferbel, T.; Melissinos, A. C.; Olsen, S.; Slattery, P.; Tipton, P. et al.
Object Type:
Report
System:
The UNT Digital Library
Anaerobic bioprocessing of low-rank coals. [Veillonella alcalescens and Propionibacterium acidipropionici]
The overall goal of this project is to find biological methods to remove carboxylic functionalities from low-rank coals under ambient conditions and to assess the properties of these modified coals towards coal liquefaction. The main objectives of this quarter were: (1) continuation of microbial consortia development, (2) evaluation of the isolated organisms for decarboxylation, (3) selection of best performing culture (known cultures vs. new isolates), and (4) coal decarboxylation using activated carbon as blanks. The project began on September 12, 1990.
Date:
January 30, 1992
Creator:
Jain, M. K.; Narayan, R. & Han, O.
Object Type:
Report
System:
The UNT Digital Library
Energy transfer properties and mechanisms
The overall objective of the research carried out under this program is to determine the principles of collisional energy transfer and use them in predictive models and theories. In order to accomplish this goal, energy transfer properties must be determined and then analyzed to discern the underlying principles involved. In this laboratory, the experimental determination of energy transfer parameters is based on techniques that use physical properties to monitor the amount of energy in excited molecules. These techniques differ from chemical methods, based on unimolecular reaction studies, which are susceptible to interferences from complex chemical mechanisms and other complications. The physical methods have their own weaknesses and limitations, however, and much of our effort has been directed toward gaining a better understanding of these deficiencies. Two physical techniques have been proved to be particularly useful: time-resolved infrared fluorescence and time-dependent thermal lensing. As described later, we will shortly begin work using resonance enhanced multiphoton ionization techniques to investigate energy transfer in bulbs and half collisions'' in free jets. We also have been completing some calculational efforts to model formation of polycyclic aromatic hydrocarbons in stellar atmospheres.
Date:
January 30, 1992
Creator:
Barker, J. R.
Object Type:
Report
System:
The UNT Digital Library
Photoinitiated electron transfer in multichromophoric species: Synthetic tetrads and pentads featuring diquinone moieties
This project involves the design, synthesis and photophysical study of complex molecular systems engineered to achieve long lived charge separated states by a biomimetic, photoinitiated multistep electron transfer process. The use of these artificial systems to investigate different electron and energy transfer strategies will allow the evolution of more efficient molecular devices for the gathering of light energy and its transformation into chemical potential energy. The three major aspects of the work emphasized in the initial proposal are: design and synthesis of molecular devices incorporating new quinone moieties, synthesis and spectroscopic studies of molecular tetrads and pentads featuring modified porphyrin-diquinone linkages, and new photochemical and photophysical investigations of tetrads and pentads, including the development of methods for harvesting the energy stored in long-lived charge separated states.
Date:
April 30, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Development of a reburning boiler process model
The overall objective of this program is to integrate EER's expertise in boiler reburning performance evaluation into a package of analytical computer tools. Specific objectives of the program are to develop a computational capability with the following features: (1) can be used to predict the impact of gas reburning application on thermal conditions in the boiler radiant furnace, and on overall boiler performance; (2) can estimate gas reburning NO{sub x} reduction effectiveness based on specific reburning configurations and furnace/boiler configurations; (3) can be used as an analytical tool to evaluate the impact of boiler process parameters (e.g., fuel switching and changes in boiler operating conditions) on boiler thermal performance; (4) is adaptable to most boiler designs (tangential and wall fire boilers) and a variety of fuels (solid, liquid, gaseous and slurried fuels); (5) is sufficiently user friendly to be exercisable by engineers with a reasonable knowledge of boilers, and with reasonable computer skills. Here, user friendly'' means that the user will be guided by computer codes during the course of setting up individual input files for the boiler performance model.
Date:
January 30, 1992
Creator:
Wu, K. T.
Object Type:
Report
System:
The UNT Digital Library
Enhancement of surface properties for coal beneficiation
This report will focus on means of pyrite removal from coal using surface-based coal cleaning technologies. The major subjects being addressed in this study are the natural and modulated surface properties of coal and pyrite and how they may best be utilized to facilitate their separation using advanced surface-based coal cleaning technology. Emphasis is based on modified flotation and oil agglomerative processes and the basic principles involved. The four areas being addressed are: (1) Collectorless flotation of pyrite; (2) Modulation of pyrite and coal hydrophobicity; (3) Emulsion processes and principles; (4) Evaluation of coal hydrophobicity.
Date:
January 30, 1992
Creator:
Chander, S. & Aplan, F.F.
Object Type:
Report
System:
The UNT Digital Library
[Press release: Plenary speakers slated for fifth annual Creating Change Conference]
Press release announcing speakers for the fifth Creating Change conference.
Date:
April 30, 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
[Fax: ACT UP/ Presidential Project]
A fax from ACT UP addressing independent presidential candidate, H. Ross Perot, saying he was planning on avoiding the controversy surrounding LGBT cabinet appointments.
Date:
May 30, 1992
Creator:
ACT UP
Object Type:
Text
System:
The UNT Digital Library
[Press release: Clergyman and former Navy officer testifies in Congress to end military ban on gays]
Press release covering the testimonies of a Episcopalian reverend and a former Navy officer to Congress to end the military ban on gays and lesbians.
Date:
May 30, 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
[Picture and news release: "Lavender Law" Conference draws record numbers; National Lesbian and Gay Law Association names new leadeship]
A picture and a news release from the National Lesbian and Gay Law Association discussing their Lavender Law Conference that drew more attendees than ever and the elections that were held for policies, resolutions, and leaders.
Date:
October 30, 1992
Creator:
National Lesbian and Gay Law Association
Object Type:
Text
System:
The UNT Digital Library
[Press release: NGLTF members; backed Tsongas; are highly involved in electoral politics]
Press release announcing the results of a Presidential Initiative Survey.
Date:
April 30, 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
[Press release: Students elect their first openly-gay state-wide president]
Press release from the State University of New York announcing the election of their first openly gay President of the Student Association of the State University of New York.
Date:
November 30, 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 31, Ed. 1 Thursday, July 30, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
July 30, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 18, Ed. 1 Thursday, April 30, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
April 30, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 5, Ed. 1 Thursday, January 30, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
January 30, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The comparison of DYNA3D to approximate solutions for a partially- full waste storage tank subjected to seismic loading
Mathematical solutions to the problem consisting of a partially-full waste tank subjected to seismic loading, embedded in soil, is classically difficult in that one has to address: soil-structure interaction, fluid-structure interaction, non-linear behavior of material, dynamic effects. Separating the problem and applying numerous assumptions will yield approximate solutions. This paper explores methods for generating these solutions accurately.
Date:
September 30, 1992
Creator:
Zaslawsky, M. & Kennedy, W. N.
Object Type:
Report
System:
The UNT Digital Library
Characterization of the Defense Waste Processing Facility (DWPF) Environmental Assessment (EA) glass standard reference material. [Site Characterization]
Liquid high-level nuclear waste at the Savannah River Site (SRS) will be immobilized by vitrification in borosilicate glass. The glass will be produced and poured into stainless steel canisters in the Defense Waste Processing Facility (DWPF). Other waste form producers, such as West Valley Nuclear Services (WVNS) and the Hanford Waste Vitrification Project (HWVP), will also immobilize high-level radioactive waste in borosilicate glass. The canistered waste will be stored temporarily at each facility for eventual permanent disposal in a geologic repository. The Department of Energy has defined a set of requirements for the canistered waste forms, the Waste Acceptance Preliminary Specifications (WAPS). The current Waste Acceptance Preliminary Specification (WAPS) 1.3, the product consistency specification, requires the waste form producers to demonstrate control of the consistency of the final waste form using a crushed glass durability test, the Product Consistency Test (PCT). In order to be acceptable, a waste glass must be more durable during PCT analysis than the waste glass identified in the DWPF Envirorunental Assessment (EA). In order to supply all the waste form producers with the same standard benchmark glass, 1000 pounds of the EA glass was fabricated. The chemical analyses and characterization of the benchmark EA glass …
Date:
September 30, 1992
Creator:
Jantzen, Carol M.; Bibler, N. E. & Beam, D. C.
Object Type:
Report
System:
The UNT Digital Library
Hydrogen Separation by Ceramic Membranes in Coal Gasification
Project Objectives are to develop hydrogen-permselective ceramic membranes for water-gas shift membrane-reactor suitable for hydrogen production from coal gas and evaluate the technical and economic potential of the membrane-reactor. During the reporting period exploratory experiments begun on a membrane preparation technique aimed at providing higher membrane permeance. The new preparation technique involves two stages. The first stage is the formation of a layer of silica gel by a two-phase interfacial reaction within the pores of the substrate. The gel is then dried and calcined yielding a microporous (pore diameter below 10 [Angstrom]) silica layer within the pores of the substrate tube. The second stage involves one-sided chemical vapor deposition using the SiCl[sub 4]-H[sub 2]O reaction to close up the micropores of the gel layer and produce the final hydrogen permselective membrane. Chemical reactions involved are described.
Date:
April 30, 1992
Creator:
Gavalas, G. R.
Object Type:
Report
System:
The UNT Digital Library
Alternative washing strategy during in-tank precipitation processing
If late washing of precipitate is available, it is possible to modify the normal washing phase of the ITP process so that tank corrosion is prevented by inhibiting with sodium hydroxide rather than sodium nitrite. Hydroxide inhibition has numerous advantages to a hydroxide/nitrite flowsheet.1 However, the rate of hydroxide depletion due to radiolysis and C0[sub 2] absorption were uncertainties. Based on recent experiments and calculations: hydroxide consumption by radiolysis will be 0.01 molar per month during Tank 49 storage, hydroxide depletion due to C0[sub 2] absorption will vary from 0.0006 to 0.025 molar per month for waste volumes between 50,000 and 1 million gallons and air flowrates between 100 and 200 cfm. A nominal rate of 0.006 molar/month (or less) is expected in Tank 49 after the first two ITP cycles have been completed. A material balance for the ITP process based on hydroxide inhibition has been calculated and the potential savings have been estimated.
Date:
October 30, 1992
Creator:
Walker, D. D. & Hobbs, D. T.
Object Type:
Report
System:
The UNT Digital Library
X-Ray and [Gamma]-Ray Spectroscopy of Solids Under Pressure
The effort is divided into the following: high pressure transitions (Fe, RbCl), XAFS studies of perovskites under pressure (ReO[sub 3], high-[Tc] superconductors), studies of XANES of alkali halides, and Moessbauer studies (iron silicate spinel).
Date:
April 30, 1992
Creator:
Ingalls, R.L.
Object Type:
Report
System:
The UNT Digital Library