Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Coal production"”.
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Forecast of Virginia coal production
This thesis provides a model for forecasting coal production rates in southwest Virginia. A multiple linear regression model is developed for the forecasting process. The model includes six independent variables: Virginia coal price times Virginia coal mining productivity (x₁), Virginia mining …
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A Dynamic Programming Approach to Identifying Optimal Mining Sequences for Continuous Miner Coal Production Systems
<p>Underground mines are the source of 33% of US coal production and 60% of worldwide coal production. Room-and-pillar mining with continuous miners has been the most common production system used in these mines since the 1960s. The introduction of continuous miners mechanized the underground coal …
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Appalachian Coal Miners At Greater Risk For Silica Exposure than Rocky Mountains
… estimates the effect of regional location on coal mine employee exposure to crystalline silica, and the odds of a coal workers pneumoconiosis diagnosis. </p> <p>Study Design </p> <p>The MSHA datasets cover all enforcement cases from 1970 to present, and include employee personal sampling …
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A Characterization and Determination of the Coal Reserves and Resources of Southwest Virginia
Coal mining and timber are the two primary industries supporting the people of Southwest Virginia. Coal mining has occurred for more than 100 years, but production has dropped since reaching a peak in 1990. In order to properly plan with remaining coal production a study was conducted to …
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South African transport : an energy model until the year 2000
… satisfied by oil produced locally using oil-from-coal production. The limitations on present forecasting methods used for the transport sector are discussed arid the need for a review of current estimates is considered. The potential for energy conservation using modified transport patterns is …
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Factors considered for increasing longwall panel width
Longwall mining is the preferred method in coal mining to maximize production and reserve recovery by extracting large blocks of coal that have been outlined with a set of continuous miner development entries. In the US, technological advances and system enhancements have steadily improved …
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Effects of calcium, sulphur and potassium concentration in overburden on quality of strip mine drainage
… especially with present increased emphasis on coal production. Analysis of overburden is becoming mandatory in order to plan effective placement of material in spoil piles. One rapid technique with little sample preparation for determination of elements in overburden is scanning electron …
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Ecology, Agriculture and Proletarianization : A study of the sinazongwe area in Gwembe Valley of the Southern Province of Zambia : 1900 to 1989
… led to the opening of Nkandabwe and later Maamba coal mines in the Sinazongwe sub district. Here the study demonstrates the impact of coal production on human resettlement,the leaching of agricultural lands of the local people located beside the Kazinze river and the study also highlights the …
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Ecology, Agriculture and Proletarianization : A study of the sinazongwe area in Gwembe Valley of the Southern Province of Zambia : 1900 to 1989
… led to the opening of Nkandabwe and later Maamba coal mines in the Sinazongwe sub district. Here the study demonstrates the impact of coal production on human resettlement,the leaching of agricultural lands of the local people located beside the Kazinze river and the study also highlights the …
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Investigation of Spontaneous Combustion Inhibition of Coal Fires Utilizing Differential Scanning Calorimetry and Thermogravimetric Analysis
<p>Self-oxidation of coals can result in spontaneous combustion events at any time during mining, transporting, or processing, causing environmental, economical, and safety concerns. The total global primary coal production as of 2012 was 8.7 billion tons. Of that, 1.1 billion tons of coal was …
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Shear Strength Parameters of Sand Fly Ash Cement Mixtures
According to a 2012 American Coal Ash Association Coal production Survey Report, US coal fired power plants produced more than 109 million tons of waste that year. Approximately half of this waste is the valuable by-product fly ash. There are three classes of fly ash: cementitious class C and …
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Measurement of the Effectiveness of a Decision Support System for Blending Control of Large Scale Coal Mines
Large opencast coal mines require a complex infrastructure to fulfill production demand and quality values. The distinct specifications required by each customer are achieved by blending adjustments. There is limited control in variability. With only partial information available, operation …
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APA das Onças: gestão do território e desafios para conservação dos ecossistemas. João Pessoa – PB 2011.
… into four categories: the usage of the riverbed, coal production, coivara, and mosaic cultivation. This lack of control, joined with the absence of an action for environmental education of the resident population (traditional), and also the delay in the elaboration of the control plan, are the …
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An analysis of the development, the problems and proposed statutory regulations for strip coal mining.
The days of the coal miner going deep into the ground with his pick and shovel are rapidly being replaced by the claimed safer practices of strip mining. National attention was focused on strip coal mining in the 1960's with emphasis on the Appalachian Region. Rapidly increasing electrical demands …
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Longwall weighting events at Phalen Colliery, Nova Scotia, Canada
… are dynamic phenomenon observed in mines where coal is extracted using the longwall mining method. Weightings are characterized by high convergence rates within the powered supports which maintain roof stability along the longwall face. Rapid convergence is induced by ground pressures that …
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Economic analysis of the Virginia steam coal market
In recent years the Central Appalachian coal industry has suffered from a number of changes in the structure of the coal market. Foremost among these changes have been the collapse of the domestic steel industry and the passage of the Staggers Act. In the past high quality central Appalachian coal …
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The impact of coal mining on the environment and community quality of life: a case study investigation of the impacts and conflicts associated with coal mining in the Mpumalanga Province, South Africa
Coal is South Africa's major primary energy source, and plays a significant role in supplying the chemicals and steelmaking industries. The benefits of coal production are relevant in the light of South Africa's development priorities of job creation and economic growth. Even so, primary metal …
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ESSAYS ON ISSUES IN PUBLIC AND ENVIRONMENTAL ECONOMICS
… Chapter 1 studies the impact of declining coal demand on local labor markets in coal mining regions of the US. I separate the effect of a recent contraction in the coal industry from other factors driving economic trends in coal country by constructing an instrument for coal demand from …
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