نتایج جستجو برای: industry and mine
تعداد نتایج: 16860083 فیلتر نتایج به سال:
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
A crucial problem in the mining industry is to determine the optimal sequence of extraction of blocks, in which the mine has been structured for exploitation. Typically a mine can be constituted by several thousands or millions of blocks. The sequencing models for this structure are very complex giving rise to very large combinatorial linear models. Operational mine plans are usually produced o...
The Itai-Itai disease case is one of four major pollution-related lawsuits occurring in Japan after World War H. This paper, which is based on investigations of the pollution source, the Kamioka mine, considers (1) the history of the disturbances to the environment caused by the Kamioka mine; (2) the Itai-Itai disease suit; (3) the pollution nprevention measures and methods of the Kamioka mine ...
water has an important role in creating pollution problems in the mining regimes influencing the surrounding surface environment. the purpose of this study is to make an assessment of groundwater quality in an underground mine site in portugal with a view of determining the pollution potential of groundwater. in the corresponding surface area of this underground mine, intersections of fou...
introduction due to mining, considerable amounts of heavy metal bearing mineralsare scattered in the atmosphere in the form of dust and make the surrounding air, water and soils polluted.runoff water movingfrom the mountainstowardsplains may also transport heavy metals from mines to the soils.one type ofpollutions is contamination withheavy metals.the purpose of the present research has been to...
Communications in coal mines are poor by general industry standards, and generate significant risks in the lack of information available from underground areas. Mines often employ multiple incompatible systems for communication. This report concludes that there is no technical barrier to the upgrading of coal mine communications to equivalent standards of those used by general commercial and in...
Abstract: Fate and transport models have extensively been used to predict distribution of toxic substances in the multi-media environment. In mining industry, predictive models are commonly used to evaluate performance of mitigation measures and estimate remediation costs during different phases of a mine lifecycle. These models are often used in deterministic form; however the probabilistic an...
Due to the recent saturation of the traditional telecom markets, the vendors are shifting their focus on to the vertical markets, including but not limited to oil and mine industries. This paper is offering a solution for one of the key issues the mine industry is facing. When the accident happen under the mine, the first thing to do is to locate the workers, there are many methods been propose...
Optimisation tools which determine the best layout for access and haulage in an underground mine address an important and difficult mine design problem. The complexity of the problem can be compared to the task of optimising the final pit design in an open pit, together with the pit haul roads required. The strategic design of an underground mine layout must address the location of haulage shaf...
In Chapter 1, the high incidence of exaggerated hearing test results in the South African mining industry, as well as the negative impact this exaggeration potentially has in terms of cost and the effectiveness of audiological centres, was described. This sets the scene for this study which attempts to evaluate one possible way to address deliberate exaggeration of hearing loss on the part of n...
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