Coal Quality Management Model For Dome Storage (DS-CQMM)

Coal quality (ash, sulphur, moisture, and heating value) is one of the fundamental concerns for both coal mines and power plants. In order to deliver uniform coal quality to the power plant, there is a need for realtime monitoring of coal quality from the mine to the coal stockpiles. The specific problem represents the process of stacking the coal inside an enclosed facility such as a dome. The objective of this research was to develop a custom-made and integrated coal quality management model for dome storage (DS-CQMM). The DS-CQMM merges existing technology in surface mines, such as coal analysers, together with automation technologies, information technologies (IT), and mathematical models. The DS-CQMM is organized into four major sections: Delay Time application, Stacker application, Reclaimer application, and Live Stockpile application. A sub-process called Volume Calculation is embedded in Stacker application, while an additional feature called Forecast tool is included in the Reclaimer application. The DS-CQMM model was developed for a surface coal mine in the southern USA

Sex- and age-related differences in the management and outcomes of chronic heart failure: an analysis of patients from the ESC HFA EORP Heart Failure Long-Term Registry

Aims: This study aimed to assess age- and sex-related differences in management and 1-year risk for all-cause mortality and hospitalization in chronic heart failure (HF) patients. Methods and results: Of 16 354 patients included in the European Society of Cardiology Heart Failure Long-Term Registry, 9428 chronic HF patients were analysed [median age: 66 years; 28.5% women; mean left ventricular ejection fraction (LVEF) 37%]. Rates of use of guideline-directed medical therapy (GDMT) were high (angiotensin-converting enzyme inhibitors/angiotensin receptor blockers, beta-blockers and mineralocorticoid receptor antagonists: 85.7%, 88.7% and 58.8%, respectively). Crude GDMT utilization rates were lower in women than in men (all differences: P\ua0 64 0.001), and GDMT use became lower with ageing in both sexes, at baseline and at 1-year follow-up. Sex was not an independent predictor of GDMT prescription; however, age >75 years was a significant predictor of GDMT underutilization. Rates of all-cause mortality were lower in women than in men (7.1% vs. 8.7%; P\ua0=\ua00.015), as were rates of all-cause hospitalization (21.9% vs. 27.3%; P\ua075 years. Conclusions: There was a decline in GDMT use with advanced age in both sexes. Sex was not an independent predictor of GDMT or adverse outcomes. However, age >75 years independently predicted lower GDMT use and higher all-cause mortality in patients with LVEF 6445%

Novel Excavation Technologies for Efficient and Economic Surface Mining

Ground excavation constitutes a significant component of production costs in any surface mining operation. The excavation process entails material digging and removal in which the equipment motion is constrained by the workspace geometry

An Analysis of the Coal Mining Industry in the United States

The coal mining industry is a vital economic sector for many countries including the United States (US). Coal is the primary fuel for electricity generation in the US and it is the cheapest and most abundant source of energy. The production of coal increased significantly from 573 million tonnes in 1978 to nearly 1.1 billion tonnes in 2006. This paper provides an overview of coal reserves in the US and an analysis of the coal industry\u27s historical data with respect to the number of mines, total production, productivity, the number of employees, and safety and environmental records. It then discusses the issues challenging the coal industry regarding its future, including accurate estimation of reserves, regulatory limitation on carbon dioxide emissions, mine workers\u27 safety, mine productivity, and resource optimization, as well as current efforts to address them

An Assessment of Blasting Vibrations: A Case Study on Quarry Operation

Problem statement: One of the major environmental concerns related to blasting operation in mining and civil engineering projects is ground vibration. Approach: This study presented an assessment of ground vibrations caused by the blasting experiments at a marlstone quarry in northern Italy. The primary goal of this study was to determine the vibration level in order to protect dwelling area adjacent to the quarry. Based on the data obtained from the field, a new equation for the level of ground vibrations was proposed. Results: A comparative analysis between the results obtained by the new equation and common empirical predictors currently used in blasting practice was also carried out. Conclusion: Results indicated that a new equation may be used as a reliable predictor of the vibration level for the studied quarry

An Assessment of Blasting Vibrations: A Case Study on Quarry Operation

Problem statement: One of the major environmental concerns related to blasting operation in mining and civil engineering projects is ground vibration. Approach: This study presented an assessment of ground vibrations caused by the blasting experiments at a marlstone quarry in northern Italy. The primary goal of this study was to determine the vibration level in order to protect dwelling area adjacent to the quarry. Based on the data obtained from the field, a new equation for the level of ground vibrations was proposed. Results: A comparative analysis between the results obtained by the new equation and common empirical predictors currently used in blasting practice was also carried out. Conclusion: Results indicated that a new equation may be used as a reliable predictor of the vibration level for the studied quarry

Pilot Sample Risk Analysis for Underground Coal Mine Fires and Explosions Using MSHA Citation Data

After three decades of sustained continuous improvement of mine safety performances in the US, mine disasters in 2006 and 2007 compromised an excellent record and presented new challenges and vulnerabilities for the underground coal mining industry. In the aftermath of the incidents, formal investigations and new scrutiny of mine safety by the US Congress and expert study groups followed. The US Congress passed the Mine Improvement and New Emergency Response Act of 2006 (MINER Act), which mandated new laws to address the issues, including those related to mine fires and explosions from which miners must be protected. The National Mining Association-sponsored Mine Safety Technology and Training Commission report highlighted the role of risk analysis and management in identifying and controlling major hazards, such as fires and explosions. In this paper an approach is given for analyzing the risks for fires and explosions based on the Mine Safety and Health Administration citation database. Using 2006 citation data and focusing on subsystem failures, the methodology is applied to a database for a pilot sample of underground coal mines stratified by mine size and state

Surface Miners: Evaluation of the Production Rate and Cutting Performance Based on Rock Properties and Specific Energy

The purpose of this research was to evaluate the production rate (PR) and cutting performance of surface miners (SM) based on rock properties and specific energy (SE). We use data from equipment manufacturers and experimental data in this study and propose a new method and equations to determine both the PR and the cutting speed of SM. The unconfined compressive strength (UCS) of the rock, its abrasivity, and the machine’s engine power are the three most important factors influencing the PR. Moreover, the cutting depth, UCS, and engine power have a significant impact on the cutting speed. We propose a new method and equations to determine the energy required to cut a volume unit and a surface unit, i.e., specific energy, and establish the relationship between SE, UCS, and PR. The results of this study can be used by surface miner operators to evaluate the applicability of the machines to a specific mine site

The first dentist in kragujevac - Dr Andrija Taskovic

© 2014, Serbian Medical Society. All rights reserved. The Faculty of Dentistry was founded in 1948 when 138 students including Andrija Taskovic enrolled the first year. He graduated in 1954 as the best student in the generation (with average mark 9.6) and the same year he came to Kragujevac to be the first dentist. He remained there for less than a year. He performed all dental operations and by creating conditions for the safe surgical work and by performing surgical interventions, he developed the foundations of the oral-surgical activity in Kragujevac