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470 Matching Results
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Steam gasification of carbon: Catalyst properties
This research uses several techniques to measure the concentration of catalyst sites and determine their stoichiometry for the catalyzed gasification of carbon. Both alkali and alkaline earth oxides are effective catalysts for accelerating the gasification rate of coal chars, but only a fraction of the catalyst appears to be in a form that is effective for gasification, and the composition of that catalyst is not established. Transient techniques, with {sup 13}C labeling, are being used to study the surface processes, to measure the concentration of active sites, and to determine the specific reaction rates. We have used secondary ion mass spectrometry (SIMS) for both high surface area samples of carbon/alkali carbonate mixtures and for model carbon surfaces with deposited alkali atoms. SIMS provides a direct measure of surface composition. The combination of these results can provide knowledge of catalyst dispersion and composition, and thus indicate the way to optimally utilize carbon gasification catalysts.
Date:
March 16, 1992
Creator:
Falconer, J.L.
Object Type:
Report
System:
The UNT Digital Library
Enhanced coal hydrogasification via oxidative pretreatment
The gasification of coal char by hydrogen is much slower than in steam or carbon dioxide; moreover, hydrogasification rate in pure hydrogen decreases sharply with conversion for most carbons. To overcome this kinetic behavior, the oxidation of the char prior to and during hydrogasification has been investigated as a means of enhancing hydro gasification rate. Kinetic rate studies under well-characterized conditions have been complemented by careful surface analyses to characterize oxygen on the char surface prior to and during hydrogasification.
Date:
April 16, 1992
Creator:
Miller, D.J.
Object Type:
Report
System:
The UNT Digital Library
Etiology of contaminated wounds
The US Department of Energy reports of events that occurred in the chemical processing 200 Areas of the Hanford Site during the period from 1972 through 1986 were reviewed to identify the causes of contaminated wounds. Contaminated wounds were reported in 19 events involving 20 workers. The causal agents (high risk operations) and the root causes were characterized. Emergency actions taken and their efficacy were noted. The 19 wound events were compared with 17 events with the potential for inhalation. It was found that the wound events involve a single worker and frequently result in an internal contamination and its resulting dose. Inhalation events involve groups of workers and rarely resulted in detectable internal contamination. The difference is attributed to anticipation of an inhalation event and use of respiratory protection and continuous air monitors to mitigate its effects.
Date:
January 16, 1992
Creator:
Sudmann, R.H.
Object Type:
Article
System:
The UNT Digital Library
Failure of latch mechanism for motion control of safety rods
During safety rod tests in K-reactor prior to startup, one safety rod could not be lifted because the button'' broke off and became lodged in the mechanism. Examination of the failed latch assembly along with other assemblies from both K-Area and L-Area revealed several missing buttons as well as severely deformed jaw hanger extensions.'' We participated in the investigation of the damage by request of the Reactor Restart Section. Based on our study of the latch mechanism, the modifications to the safety rod extension,'' and the operating history of the machine, this memorandum describes the causes of the observed damage with experimental evidence and calculations to support the findings. 3 refs.
Date:
January 16, 1992
Creator:
Yau, W. W. F. & Leader, D. R.
Object Type:
Report
System:
The UNT Digital Library
Faculty Recital: 1992-06-16 - Second Annual Summer Music Festival Chamber Music
Access:
Use of this item is restricted to the UNT Community
A faculty and recital performed at the UNT College of Music Recital Hall.
Date:
June 16, 1992
Creator:
Veazy, Charles; Hiramoto, Stephen; Scott, John C. (John Charles), 1947-; Gillespie, James; Watson, Linda; Grenier, Peter et al.
Object Type:
Sound
System:
The UNT Digital Library
Guest Artist Recital: 1992-10-16 – Karin Redekopp Edwards, lecturer
Access:
Use of this item is restricted to the UNT Community
Lecture recital presented at 1992 American Liszt Society Festival UNT College of Music Concert Hall.
Date:
October 16, 1992
Creator:
Edwards, Karin Redekopp
Object Type:
Sound
System:
The UNT Digital Library
Guest Artist Recital: 1992-10-16 – Jay Rosenblatt, lecturer
Access:
Use of this item is restricted to the UNT Community
Lecture recital presented at 1992 American Liszt Society Festival UNT College of Music Concert Hall.
Date:
October 16, 1992
Creator:
Rosenblatt, Jay (Arranger)
Object Type:
Sound
System:
The UNT Digital Library
Guest Artist Recital: 1992-10-16 – John Ardoin, lecturer
Access:
Use of this item is restricted to the UNT Community
Lecture recital presented at 1992 American Liszt Society Festival UNT College of Music Concert Hall.
Date:
October 16, 1992
Creator:
Ardoin, John
Object Type:
Sound
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 3, Ed. 1 Thursday, January 16, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
January 16, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 16, Ed. 1 Thursday, April 16, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
April 16, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 29, Ed. 1 Thursday, July 16, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
July 16, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
Talco Times (Talco, Tex.), Vol. 57, No. 8, Ed. 1 Thursday, April 16, 1992
Weekly newspaper from Talco, Texas that includes local, state, and national news along with advertising.
Date:
April 16, 1992
Creator:
Nichols, Thomas & Nichols, Nanalee
Object Type:
Newspaper
System:
The Portal to Texas History
Development of advanced NO sub x control concepts for coal-fired utility boilers
Hybrid technologies for reduction of NO{sub x} emissions from coal fired utility boilers may offer greater levels of NO{sub x} control than the sum of the individual technologies, leading to more cost effective emissions control strategies. CombiNO{sub x} is an integration of modified reburning, promoted selective non-catalytic reduction (SNCR) and methanol injection to reduce NO{sub x} emissions from coal fired flue gas. The first two steps, modified reburning and promoted SNCR are linked. It was shown previously that oxidation of CO in the presence of a SNCR agent enhances the NO reduction performance. Less reburning than is typically done is required to generate the optimum amount of CO to promote the SNCR agent. If the reburn fuel is natural gas this may result in a significant cost savings over typical reburning. Injection of methanol into the flue gas has been shown at laboratory scale to convert NO to NO{sub 2} which may subsequently be removed in a wet scrubber. The overall objective of this program is to demonstrate the effectiveness of the CombiNOx process at a large enough scale and over a sufficiently broad range of conditions to provide all of the information needed to conduct a full-scale demonstration in …
Date:
January 16, 1992
Creator:
Newhall, J.; England, G. & Seeker, W. R.
Object Type:
Report
System:
The UNT Digital Library
Studies of transition metal and overlayers dynamics and magnetism by HE and spin-polarized metastable HE beam spectroscopies
Experimental results for the investigation of quantum delocalization of hydrogen on the Pd(111) surface; the investigation of the structural and dynamical trends in the growth of Cu overlayers on Pd(111) surface; and the investigation of the magnetic structure of the NiO(111) surface using spin-polarized metastable He beam scattering are included in this paper. Planned research is also discussed.
Date:
January 16, 1992
Creator:
El-Batanouny, M.
Object Type:
Report
System:
The UNT Digital Library
Innovative coke oven gas cleaning system for retrofit applications
Bethlehem Steel Corporation (BSC), in conjunction with the Department of Energy (DOE) is conducting a Clean Coal Technology (CCT) project at its Sparrows Point, Maryland Coke Oven Plant. This project combines several existing technologies into an integrated system for removing impurities from Coke Oven Gas (COG) to make it an acceptable fuel. DOE is providing cost-sharing under a Cooperative Agreement with BSC. This Cooperative Agreement requires BSC to develop and conduct an Environmental Monitoring Plan (EMP) for the Clean Coal Technology project and to report the status of the EMP on a quarterly basis. This report is the third quarterly status report of the EMP. It covers the Environmental Monitoring Plan activities for the full year of 1991 from January 1, 1991 through December 31, 1991, including the forth quarter. See Sections 2, 3 and 4 for status reports of the Project Installation and Commissioning, the Environmental Monitoring activities and the Compliance Monitoring results for the period. Section 5 contains a list of Compliance Reports submitted to regulatory agencies during the period. The EMP describes in detail the environmental monitoring activities to be performed during the project execution. The purpose of the EMP is to: (1) document the extent of …
Date:
October 16, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Calibration of the Fermilab E-704 polarized target
This report lists the final, best estimate of the target polarization P[sub T] as a function of time for all of the periods during which scattering data were (or may have been) collected. The information under RUN'' refers to [Delta][sigma][sub L]-runs. The notation sfs'' stands for start of frozen spin,'' efs'' for end of frozen spin,'' [yields] la'' for go to large-aperture'' target magnet position, and nla'' for not large-aperture'' position, i.e., the target magnet is in polarizing'' position. Where the NOTE'' column is blank it means that all standard frozen-spin conditions were in effect: the target temperature was reduced and the magnet was in large-aperture position. The timing marks were developed on the basis of three criteria: (1) the availability of direct NMR data, (2) the inclusion of major Target and Run boundaries, and (3) the arbitrary inclusion of enough minor'' Run boundaries to shorten large timing gaps. The sign of the P[sub T]-values is given in the NMR convention: (+) corresponds to predominant occupation of the Zeeman ground state (the thermal'' NMR-signals are considered positive). Since the target magnet field pointed upstream, (+) corresponds to target spin antiparallel to the beam momentum. The estimated uncertainty on P[sub T] …
Date:
November 16, 1992
Creator:
Hill, D.A.
Object Type:
Report
System:
The UNT Digital Library
Cluster-Molecule Systems: Analysis and Tuning of the Interaction Potential
The interaction (modelled by a LEPS potential) of a D[sub 2] molecule with an icosahedral Ni[sub 13] cluster is mapped and analyzed in the form of equipotential contour plots. The topological features of the map correlate with the energetic and dynamical characteristics of the dissociative adsorption of the molecule on the cluster, which were extracted from quasiclassical trajectory simulations. A modification of the LEPS potential used originally is introduced. It brings the calculated reactivity of the cluster into agreement with the experimental data.
Date:
September 16, 1992
Creator:
Jellinek, J. & Guevenc, Z. B.
Object Type:
Article
System:
The UNT Digital Library
Surface melting in Ni[sub 55]
The phenomenon of surface melting in a Ni[sub 55] cluster is predicted from results of molecular dynamics simulations.
Date:
September 16, 1992
Creator:
Guevenc, Z.B. & Jellinek, J.
Object Type:
Article
System:
The UNT Digital Library
[Plano Star Courier article, January 16, 1992]
An article written by Valerie Barna in the Plano Star Courier about the multinational studies program created at Carlisle Elementary School to highlight the cultures of some of its students. The PTA set up stations where students could experience the cultures.
Date:
January 16, 1992
Creator:
Barna, Valerie
Object Type:
Article
System:
The UNT Digital Library
Enhancing the use of coals by gas reburning-sorbent injection
This Clean Coal Technology project will demonstrate a combination of two developed technologies to reduce both NO[sub x] and SO[sub x] emissions: gas reburning and calcium based dry sorbent injection. The demonstrations will be conducted on two pre-NSPS utility boilers representative of the US boilers which contribute significantly to the inventory of acid rain precursor emissions: tangentially and cyclone fired units. Gas reburning is a combustion modification technique that consists of firing 80--85 percent of the fuel (corresponding to the total heat release) in the lower furnace. Reduction of NO[sub x] to molecular nitrogen (N[sub 2]) is accomplished via the downstream injection of the remaining fuel requirement in the form of natural gas (which also reduces the total SO[sub x] emissions). In a third stage, burnout air is injected at lower temperatures in the upper furnace to complete the combustion process without generating significant additional NO[sub x]. Dry sorbent injection consists of injecting calcium based sorbents (such as limestone, dolomite, or hydrated lime) into the combustion products. For sulfation of the sorbent to CaSO[sub 4], an injection temperature of about 1230[degrees]C is optimum, but calcium-sulfur reactions can also take place at lower temperatures. Thus, the sorbent may be injected at …
Date:
November 16, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Cherokeean/Herald (Rusk, Tex.), Vol. 144, No. 24, Ed. 1 Thursday, July 16, 1992
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
July 16, 1992
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 143, No. 50, Ed. 1 Thursday, January 16, 1992
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
January 16, 1992
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 144, No. 11, Ed. 1 Thursday, April 16, 1992
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
April 16, 1992
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Register, Volume 17, Number 45, Pages 4292-4390, June 16, 1992
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
June 16, 1992
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History