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Control of pyrite surface chemistry in physical coal cleaning

Description: The successful separation of pyrite from coal by flotation is dependent to a large extent upon the selectivity of the process, and the use of a pyrite depressant is one of the most important and cost-effective techniques for achieving this. This report evaluates the effects of three factors on the floatability of pyrite. These are (1) the superficial oxidation of pyrite, (2) the contamination of pyrite surfaces by carbonaceous matter, and (3) pulp redox potentials. XPS (x-ray photoelectron spec… more
Date: June 24, 1992
Creator: Luttrell, G. H.; Yoon, R. H. & Ou, Z. S.
Partner: UNT Libraries Government Documents Department
open access

Seismic analysis of reactor exhaust air filter compartment

Description: The Filter Compartment (FC) in this analysis is a generic reactor airborne activity confinement filter compartment which possesses all the essential physical and mechanical properties of the Savannah River Site (SRS) confinement filters of Reactor Buildings K, L, and P. The filters belong to the Airborne Activity Confinement System (AACS). These filters absorb a significant amount of radioactive effluents from the exhausting air. The seismic excitation is input indirectly from the output of the… more
Date: September 24, 1990
Creator: Gong, Chung; Funderburk, E.L. & Jerrell, J.W.
Partner: UNT Libraries Government Documents Department
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Control of pyrite surface chemistry in physical coal cleaning

Description: To better understand the surface chemical properties of coal and mineral pyrite, studies on the effect of flotation surfactants (frother and kerosene) on the degree of hydrophobicity have been conducted. The presence of either frother or kerosene enhanced the flotability of coal and mineral pyrite with a corresponding decrease in induction time over the pH range examined. Scanning electron microscopy (SEM) results indicate a correlation exists between the sample surface morphology and crystal s… more
Date: June 24, 1992
Creator: Luttrell, G. H.; Yoon, R. H.; Zachwieja, J. & Lagno, M.
Partner: UNT Libraries Government Documents Department
open access

A first simulation study of the barrel-endcap transition region in a calorimeter of the scintillator tile design

Description: We have made a first study of the calorimetric response to 10 GeV/c charged pions in the transition region between barrel and endcap for the scintillator-tile design pursued at Argonne National Laboratory using the simulation program ANLSIM. For (very nearly) projective tower orientations in the barrel, the crack appears deep within a narrow angular range, causing a loss of the response in that region up to 40%. Pointing the towers onto the beam axis 35 cm or more away from the nominal-interact… more
Date: August 24, 1990
Creator: Proudfoot, J. & Trost, H. J.
Partner: UNT Libraries Government Documents Department
open access

Establishment and maintenance of a coal sample bank and data base

Description: In the project status report for 4/9/90--7/8/90, Table 2 presented update results of a comparative study of coal sample deterioration in several container types including foil laminate bags. This table contained an erroneous entry (foil laminate bag {minus}20 mesh, alkali extraction 65.4% transmittance). The alkali extraction test on {minus}20 mesh coal stored in foil laminate bags for 52 weeks was repeated in duplicate on another bag (after 64 weeks total storage) resulting in a measurement of… more
Date: October 24, 1990
Creator: Davis, A.
Partner: UNT Libraries Government Documents Department
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Stress-Relief Displacements Induced by Drilling--Applications to Holographic Measurements of in Situ Stress

Description: The holographic stressmeter is an instrument which has been developed at Caltech to allow determination of the complete stress tensor from in situ borehole measurements. The stressmeter uses double-exposure holographic interferometry to record the displacements induced by the drilling of a small sidehole into the borehole wall. The local stresses, which are the result of the far-field stresses, concentrated at the borehole, cause deformation of the surface of the borehole wall in the vicinity o… more
Date: April 24, 1992
Creator: Ahrens, T. J. & Smither, C. L.
Partner: UNT Libraries Government Documents Department
open access

Full-Scale Demonstration Low-NOx Cell Burner retrofit

Description: The overall objective of the Full-Scale Low-NOx Cell (LNC) Burner Retrofit project is to demonstrate the cost-effective reduction of NOx generated by a large, base-loaded (70% capacity factor or greater), coal-fired utility boiler. Specific objectives include: at least 50% NOx reduction over standard two-nozzle cell burners, without degradation of boiler performance or life; acquire and evaluate emission and boiler performance data before and after the retrofit to determine NOx reduction and im… more
Date: May 24, 1991
Partner: UNT Libraries Government Documents Department
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Improved radioimmunotherapy of hematologic malignancies

Description: This research project proposes to develop novel new approaches of improving the radioimmunodetection and radioimmunotherapy of malignancies by augmenting retention of radioimmunoconjugates by tumor cells. The approaches shown to be effective in these laboratory experiments will subsequently be incorporated into out ongoing clinical trials in patients. Specific project objectives include: to study the rates of endocytosis, intracellular routing, and metabolic degradation of radiolabeled monoclon… more
Date: March 24, 1992
Creator: Press, O.W.
Partner: UNT Libraries Government Documents Department
open access

Control of pyrite surface chemistry in physical coal cleaning

Description: One of the most difficult separations in minerals processing involves the differential flotation of pyrite and coal. Under practical flotation conditions, they are both hydrophobic and no cost-effective method has been developed to efficiently reject the pyrite. The problem arises from inherent floatability of coal and pyrite. Coal is naturally hydrophobic and remains so under practical flotation. Although pyrite is believed to be naturally hydrophilic under practical flotation conditions it un… more
Date: June 24, 1992
Creator: Yoon, R. H. & Richardson, P. R.
Partner: UNT Libraries Government Documents Department
open access

Theory-based transport simulations of TFTR L-mode temperature profiles

Description: The temperature profiles from a selection of TFTR L-mode discharges are simulated with the 1-1/2-D BALDUR transport code using a combination of theoretically derived transport models, called the Multi-Mode Model. The present version of the Multi-Mode Model consists of effective thermal diffusivities resulting from trapped electron modes and ion temperature gradient ({eta}{sub i}) modes, which dominate in the core of the plasma, together with resistive ballooning modes, which dominate in the per… more
Date: October 24, 1991
Creator: Bateman, G.
Partner: UNT Libraries Government Documents Department
open access

(Fourth international conference on fusion reactor materials)

Description: This report summarizes the International Conference on Fusion Reactor Materials (ICFRM-4) which was held December 4--9, 1989, in Kyoto, Japan, as well as the results of several workshops, planning meetings, and laboratory visits made by the travelers. The ICFRM-4 is the major forum to present and exchange information on materials research and development in support of the world's fusion development efforts. About 360 papers were presented by the 347 conference attendees. Highlights of the confe… more
Date: January 24, 1990
Creator: Bloom, E. E.
Partner: UNT Libraries Government Documents Department
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Certification Requirements: New Guidance Should Encourage Transparency in Agency Decisionmaking

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed federal agencies' certification requirements for goods and services, focusing on: (1) the extent and variety of certification activities in the federal government; (2) the extent to which there are policies, procedures, or guidance governing those activities, either governmentwide or within selected agencies; and (3) an agency certification procedure that could… more
Date: September 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
open access

Tax Administration: Tax Requirements of Small Businesses

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on small business tax requirements, focusing on: (1) the federal filing, reporting, and deposit requirements that apply to small businesses; and (2) the actual experience of small businesses in meeting these requirements, including their involvement in the Internal Revenue Service's (IRS) enforcement process."
Date: August 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
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Defense Infrastructure: Funding Risks in Services' 1999 Central Training Programs

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO examined the significant differences in two Department of Defense training programs, focusing on the: (1) training categories and military services with the most significant funding changes from the 1998 to the 1999 Future Years Defense Program (FYDP); (2) bases for the changes; and (3) potential impact of the changes on the services' future training budgets."
Date: February 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
open access

Navy Ship Maintenance: Allocation of Ship Maintenance Work in the Norfolk, Virginia, Area

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Navy's declining ship maintenance workload, focusing on: (1) the Navy's policies and procedures for allocating ship maintenance work to public and private facilities in the Norfolk area; (2) ship maintenance and modernization funding obligated to the Norfolk Naval Shipyard and private ship repair companies during the fiscal years (FY) 1994 through 1998; and… more
Date: February 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
open access

Export Controls: 1998 Legislative Mandate for High Performance Computers

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO examined: (1) whether exporter notification to the Department of Commerce of proposed sales of high performance computers (HPC) to countries of concern has resulted in license applications and what final action was taken on these licenses; and (2) how Commerce is conducting post-shipment verifications of the use of high performance computers after their export to these … more
Date: September 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
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Transportation Infrastructure: FHWA Should Assess and Compare the Benefits of Projects When Awarding Discretionary Grants

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Federal Highway Administration's (FHwA) selection process for awarding discretionary grants, focusing on: (1) determining how FHwA has implemented the requirements specified in the Transportation Equity Act for the 21st Century (TEA-21); and (2) comparing the results of the selection process for fiscal years (FY) 1998-1999 with the results of… more
Date: September 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
open access

Contract Management: DOD Pricing of Commercial Items Needs Continued Emphasis

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Department of Defense's (DOD) pricing of commercial items, focusing on: (1) the extent of price analysis DOD contracting personnel were performing to arrive at fair and reasonable prices for commercial sole-source items; (2) how well contract personnel performed price analyses; and (3) what guidance and training was available to assist them i… more
Date: June 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
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Federal Reserve Board: Merger Process Needs Guidelines for Community Reinvestment Issues

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed large bank holding company mergers and the impact of such mergers on low- and moderate-income (LMI) areas, focusing on: (1) the Federal Reserve Board's (FRB) legal responsibilities in assessing Bank Holding Company Act of 1956 (BHC) mergers for Community Reinvestment Act of 1977 (CRA) performance; (2) FRB's process for assessing the CRA performance of six large… more
Date: September 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
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Military Operations: Impact of Operations Other Than War on the Services Varies

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the impact of operations other than war (OOTW) on the military services, focusing on the: (1) impact of OOTW on the warfighting capability of each of the services, including the time to recover warfighting skills; (2) extent to which reporting systems fully capture the impacts; (3) available information on the effect of OOTW on morale and retenti… more
Date: May 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
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Medicare Physician Payments: Need to Refine Practice Expense Values During Transition and Long Term

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Health Care Financing Administration's (HCFA) ongoing efforts to develop resource-based practice expense relative value units (RVUs), focusing on: (1) whether the new methodology is an acceptable approach for revising Medicare's fee schedule; (2) questions about the data, assumptions, and adjustments underlying the new methodology that need to be addressed … more
Date: February 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
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Medical Records Privacy: Access Needed for Health Research, but Oversight of Privacy Protections Is Limited

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the types of health research conducted outside the Common Rule and Federal Drug Administration (FDA) regulations, focusing on: (1) examining how medical information is used for research and the need for personally identifiable information; (2) identifying research that is and is not subject to current federal oversight requirements; (3) examining how institutio… more
Date: February 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
open access

Drinking Water Research: Better Planning Needed to Link Needs and Resources

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Environmental Protection Agency's (EPA) safe drinking water research efforts, focusing on: (1) comparing EPA's budget requests for drinking water research during fiscal years (FY) 1997 through 2000 with: (a) the amounts authorized for such purposes by the Safe Drinking Water Act Amendments of 1996; and (b) the amounts estimated by EPA to be n… more
Date: September 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
open access

Defense Acquisitions: Comanche Program Cost, Schedule, and Performance Status

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Army's Comanche Helicopter Program, focusing on: (1) the risks in the Army's restructured plans for developing and testing the Comanche; (2) the changes in the Comanche's performance capabilities and requirements; (3) cost estimates for development; and (4) the Comanche's impact on the Army's overall aviation modernization efforts."
Date: August 24, 1999
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
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