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1995 Midnite Mine Radiation Survey
Abstract: During the week of September 4, 1995, personnel from the U.S. Bureau of Mines conducted a Ra-226 survey at the Midnite Mine. One hundred thirty measurements were made on a rectangular grid with 150-m spacings. Concurrently, Shepherd Miller, Inc., took gross gamma readings in gR/h at the same grid points. In addition, the USBM collected 17 soil samples to be analyzed for radium, thorium, and potassium. The results of this survey are summarized in this report.
Date:
1996
Creator:
Stroud, William P. & Droullard, Robert F.
System:
The UNT Digital Library
3DTOM, Three-Dimensional Geophysical Tomography
Abstract: 3DTOM is a DOS-compatible computer program developed by the Mines U.S. Bureau of for three-dimensional tomographic imaging of the subsurface at mine sites. The program uses the simultaneous iterative reconstruction technique (SIRT) to invert travel- time data and produce maps of wave velocity, or to invert amplitude data and generate maps of wave attenuation coefficients. Either seismic (compressional and/or shear) or electromagnetic (e.g., radio or radar) wave data may be used. Ray tracing in 3DTOM uses several different methods, including ray bending, network theory, and a combination of these. User-defined constraints are important in reducing the mathematical nonuniqueness of inversions based on limited data. 3DTOM permits the use of hard constraints, or soft constraints based on fuzzy logic, to allow for uncertainty in the constraints. Reliable subsurface images are useful in many different mine-related problems, including void detection, fracture detection, fluid monitoring, and qualitative stress evaluation.
Date:
1996
Creator:
Jackson, Michael J. & Tweeton, Daryl R.
System:
The UNT Digital Library
Accelerated Laboratory Test for Determination of Slacking Characteristics of Coal
Report issued by the U.S. Bureau of Mines on laboratory testing developed to measure the slacking of coals. Testing methods and results are presented. This report includes tables and graphs.
Date:
November 1930
Creator:
Fieldner, Arno Carl; Selvig, W. A. & Frederic, W. H.
System:
The UNT Digital Library
Accident-Severity Rates For Certain Metal Mines
Report issued by the U.S. Bureau of Mines on the severity of accidents in the metal-mine industry. 34 metal-mines documented the number and severity of all accidents over the course if one calendar year. This report includes tables.
Date:
September 1926
Creator:
Adams, William Waugh
System:
The UNT Digital Library
An Adaptive System for Process Control
Abstract: Researchers at the U.S. Bureau of Mines (USBM) have developed adaptive process control systems in which genetic algorithms (GA's) are used to augment fuzzy logic controllers (FLC's). GA's are search algorithms that rapidly locate near-optimum solutions to a wide spectrum of problems by loosely modeling the search procedures of natural genetics. FLC's are rule-based systems that efficiently manipulate a problem environment by modeling the "rule-of-thumb" strategy used in human decisionmaking. Together, GA's and FLC's include all of the capabilities necessary to produce powerful, efficient, and robust adaptive control systems. To perform efficiently, such control systems require a cont element to manipulate the problem environment, an analysis element to recognize changes in the problem environment, and an adaptive element to adjust to the changes in the problem environment. The control system also employs a computer simulation of the problem environment. Details of an overall adaptive control system are discussed. A specific laboratory acid-base pH system is used to demonstrate the ideas presented; all results are from the physical laboratory system and not from a computer simulation.
Date:
1995
Creator:
Karr, Charles L.; Gentry, E. J. & Stanley, D. A.
System:
The UNT Digital Library
Adhesion of Diamond Films on Tungsten
The U.S. Bureau of Mines has investigated the chemical vapor deposition of diamond films on tungsten substrates. The effects of deposition parameters on the adhesion of the films was determined. The films were produced using a hot filament chemical vapor deposition system. Parameters investigated were substrate temperature and methane concentration in the feed gas. Film quality, morphology, and composition were characterized by scanning electron microscopy and Raman spectroscopy. Adhesion testing was performed using an indentation technique, and the results were quantified by relating adhesion to interface fracture toughness. Diamond films with well-faceted crystalline morphology with grain size greater than 1 pm had poor adhesion properties regardless of substrate temperature or methane concentration. Diamond films with smooth morphologies consisting of rounded clusters of small (<0.2 pm) diamond crystallites and amorphous carbon phases displayed much higher adhesion, although the conditions that led to the growth of these films are not understood.
Date:
1995
Creator:
Maggs, K. J.; Walkiewicz, J. W. & Clark, A. E.
System:
The UNT Digital Library
Air and Gas Injection in the Oil Fields of Illinois
Report issued by the U.S. Bureau of Mines on the gas injection methods in the oil fields of Illinois. The results and properties of the injections are presented. This report includes tables, graphs, illustrations, and maps.
Date:
November 1944
Creator:
Keithly, C. M. & Jennings, Thomas
System:
The UNT Digital Library
Alumina Miniplant Operations: Separation of Aluminum Chloride Liquor from Leach Residue Solids by Classification and Thickening
Report issued by the Bureau of Mines over recovery methods of alumina through leaching of kaolin clay. The materials, equipment, and procedures used are discussed. This report includes tables, and illustrations.
Date:
1983
Creator:
Sorensen, Roy T.; Sawyer, Dwight L., Jr. & Turner, Theodore L.
System:
The UNT Digital Library
Analyses of Air from Burning Buildings
This report provides results of analyses and pertinent fata regarding eleven samples taken from the composition of the air in burning buildings.
Date:
November 1920
Creator:
Katz, S. H.
System:
The UNT Digital Library
Analyses of Crude Oils From Some Fields of Southern Louisiana
Report issued by the U.S. Bureau of Mines on the studies of crude oil samples collected from southern Louisiana. The properties of each sample are analyzed. This report includes tables.
Date:
November 1934
Creator:
Kraemer, A. J. & Garton, E. L.
System:
The UNT Digital Library
Analysis of Oil Production in the Near-Depleted Mexia-Powell Fault-Line Fields of Texas
Report issued by the U.S. Bureau of Mines on the oil fields located near the Mexia-Powell fault line in Texas. Properties of the oil fields, including geology and oil production, are presented. This report includes tables, graphs, maps, and illustrations.
Date:
August 1943
Creator:
Hill, Harry Blackburn & Guthrie, R. K.
System:
The UNT Digital Library
Andover-Sulphur Hill Iron Mines, Sussex County, New Jersey
Report issued by the Bureau of Mines on the iron mines of Sussex County, New Jersey. Descriptions of the physicality, location, and drilling methods used on the deposits are presented. This report includes tables, maps, and illustrations.
Date:
December 1947
Creator:
Lynch, Victor J.
System:
The UNT Digital Library
Annual Report of the Explosives Division, Fiscal Year 1936
Report issued by the U.S. Bureau of Mines on the U.S. Explosives Division, and the chemical and physical testing conducted. The properties of the studies conducted during 1936 are presented. This report includes tables, illustrations, and photographs.
Date:
February 1937
Creator:
Huff, Wilbert James
System:
The UNT Digital Library
Annual Report of the Explosives Division, Fiscal Year 1942
Report issued by the U.S. Bureau of Mines on the annual report of work conducted by the Explosives Division during the fiscal year of 1942. Descriptions of testing projects and operations are presented. This report includes tables, graphs, illustrations, and photographs.
Date:
December 1942
Creator:
Huff, Wilbert James
System:
The UNT Digital Library
Annual Report of the Mining Division, Fiscal Year 1941
Report issued by the U.S. Bureau of Mines on the annual study of the work done by the Mining Division. Investigations, operations, and projects completed during the fiscal year are discussed. This report includes tables, and photographs.
Date:
November 1941
Creator:
Jackson, Charles F.
System:
The UNT Digital Library
Annual Report of the Mining Division, Fiscal Year 1942
Report issued by the U.S. Bureau of Mines on the annual work conducted by the Mining Division during 1942. Descriptions of projects and operations during the fiscal year are listed. This report contains tables, and photographs.
Date:
October 1942
Creator:
Jackson, Charles F.
System:
The UNT Digital Library
Annual Report of the Secretary of the Interior for 1949: Synthetic Liquid Fuels, Part 3. - Liquid Fuels from Agricultural Residues
Report issued by the U.S. Bureau of Mines on the development and production of synthetic liquid fuels derived from agricultural products. The amount of synthetic fuels developed from corn is presented. The report includes tables, maps, and illustrations.
Date:
February 1950
Creator:
unknown
System:
The UNT Digital Library
Applicability of Radio to Emergency Mine Communications: Progress Report, September 1946 to November 1947
Report issued by the Bureau of Mines over the progress made in emergency mine communications. The results of testing done on low-frequency radio communication are presented. This report includes tables, graphs, illustrations, and photographs.
Date:
May 1948
Creator:
Felegy, E. W. & Coggeshall, E. J.
System:
The UNT Digital Library
Application of Buckley-Leverett Techniques in Oil-Reservoir Analysis
Report issued by the Bureau of Mines over new techniques of oil-reservoir analysis. The methods used are presented. This report includes tables, and graphs.
Date:
1960
Creator:
Higgins, R. V.
System:
The UNT Digital Library
Application of Electrical-Resistivity Surveys to Exploration for Zinc-Lead Deposits, Racine-Spurgeon Area, Newton County, Missouri
Report issued by the Bureau of Mines over surveys conducted on zinc-lead deposits of Newton County, Missouri. Results of the surveys are presented. This report includes tables, maps, and illustrations.
Date:
1959
Creator:
Chester, John William
System:
The UNT Digital Library
Application of Field Measurements and Computer Modeling to Evaluate Deep Mine Shaft Stability in Northern Idaho
Abstract: Researchers at the U.S. Bureau of Mines have developed personal-computer-based data acquisition, instrumentation, and mine visualization and modeling techniques to evaluate a mine accessway in a deep hard-rock mine in northern Idaho. These techniques were applied to a mine shaft in a large silver mine that has been in operation for many years. A very deep, rectangular, timber-supported shaft extending to depths exceeding 2.3 km (7,500 ft) had been deforming continuously as a result of nearby mining, resulting in operational problems. Preliminary visual observations and rock and support monitoring confirmed that severe diagonal distortion was occurring. Extensive field measurements and data analysis confirmed initial observations, provided insights into the cause of deformation, and defined a general approach to structural modeling. Computer analysis of the problem was initiated by developing a three-dimensional model of the terrain. This represented a volume of rock approximately 80 km3 (40 x 1010 ft) and an area on the surface surrounding the mine 9 km2 (3 square miles). Based on this model, a three-dimensional, finiteelement analysis was conducted to establish boundary conditions for sequentially more detailed two- and three-dimensional submodels of the shaft area. Results from the computer study are being used to develop new …
Date:
1996
Creator:
Beus, Michael J.; Orr, T. J. & Whyatt, J. K.
System:
The UNT Digital Library
Bending Fatigue Tests on Flattened Strand Wire Rope at High Working Loads
Abstract: The U.S. Bureau of Mines established a wire rope research laboratory to examine the factors that affect the safety and the useful life of wire rope. In the most recent work, two 32-mm 6x27H flattened strand ropes were degraded on a bending fatigue machine. The two tests were run at constant loads of 285 and 347 kN or safety factors of 2.5 and 2. Nondestructive and tensile strength tests were performed on samples of the ropes to determine the relationship between rope deterioration and rope breaking strength. Neither the area loss nor the number of broken wires measured from nondestructive tests could be used as clear indicators of the loss of strength. However, it was found from the tensile tests for both rope specimens that the strength loss was associated with the reduction of breaking strain. This suggests that measuring the strain of many short sections of a rope in the elastic region may locate the high stress sections and thus determine the condition of the rope.
Date:
1995
Creator:
Wang, Richard C. & Shapiro, David E.
System:
The UNT Digital Library
Beneficiation of Chromite Ores From Western United States
Report issued by the U.S. Bureau of Mines on the sampling of chrome ore deposits in the western United States. Physical properties of the samples collected are presented. This report includes tables.
Date:
June 1947
Creator:
Batty, J. V.; Mitchell, T. F.; Havens, R. & Wells, R. R.
System:
The UNT Digital Library
Beneficiation of Iron-Copper Ores from Kasaan Peninsula, Prince of Wales Island, Alaska
Report issued by the Bureau of Mines over studies conducted on the beneficiation of iron-copper ores. As stated in the summary, "this report summarizes the results of laboratory testing of copper-bearing magnetite ore from the Poorman, Rush and Brown, and Copper Center deposits, Kasaan Peninsula, Prince of Wales Island, southeastern Alaska" (p. 1). This report includes tables, maps, and illustrations.
Date:
February 1957
Creator:
Wells, R. R.; Erspamer, E. G. & Sterling, F. T.
System:
The UNT Digital Library