INVESTIGATION OF THE IMPACT OF UNPLANNED DOWNTIME OF MINING MACHINES ON COAL MINING BY SURFACE AND UNDERGROUND METHOD USING SIMULATION MODELING

Introduction. Due to the impact of adverse working conditions and climate, workers in coal-mining enterprises in the Arctic are at increased risk of occupational diseases (OD).The aim of the study was to study the working conditions, causes, structure and prevalence of occupational diseases in miners of coal mines in the Arctic.Materials and methods. Th e data of social and hygienic monitoring “Working conditions and occupational morbidity” of the population of Vorkuta and Chukotka Autonomous District in 2007–2017 are studied.Results. It was established that in 2007–2017 years, 2,296 ODs were diagnosed for the first time in 1851 coal mines, mainly in the drifters, clearing face miners, repairmen and machinists of mining excavating machines. Most often, the ODs occurred when exposed to the severity of labor, fibrogenic aerosols and hand-arm vibration. The development of professional pathology in 98% of cases was due to design flaws of machines and mechanisms, as well as imperfections of workplaces and technological processes. Diseases of the musculoskeletal system (36.2%), respiratory organs (28.9%) and nervous system (22.5%) prevailed in the structure of professional pathology of miners of coal mines. Among the three most common nosological forms of OD were radiculopathy (32.1%), chronic bronchitis (27.7%) and mono-polyneuropathy (15.4%). In 2017, coal miners in the Arctic had a professional morbidity rate of 2.82 times higher than the national rates for coal mining.Conclusions. To preserve the health of miners of coal mining enterprises, technical measures to improve working conditions and medical interventions aimed at increasing the body’s resistance to the effects of harmful production and climatic factors are necessary.

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AGENT'S REPUTATION, ACCOUNTING AND COSTING IN ORGANISATIONAL CONTROL STRUCTURES

Accounting Historians Journal ◽

10.2308/0148-4184.24.1.1 ◽

1997 ◽

Vol 24 (1) ◽

pp. 1-23 ◽

Cited By ~ 6

Author(s):

Tom McLean

Keyword(s):

Coal Mining ◽

Industrial Revolution ◽

Control Structures ◽

The Impact

This paper examines the roles of accounting and costing in the management of coal mining during the Industrial Revolution in Britain, and considers the impact of the agent's reputation in the development and use of these systems.

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Pengaruh Capital Intensity, Liquidity dan Sales Growth Terhadap Agresivitas Pajak

Jurnal Ilmiah Akuntansi Kesatuan ◽

10.37641/jiakes.v9i3.888 ◽

2021 ◽

Vol 9 (3) ◽

Author(s):

Fanny Nisadiyanti ◽

Willy Sri Yuliandhari

Keyword(s):

Coal Mining ◽

Sample Selection ◽

Capital Intensity ◽

Sales Growth ◽

Tax Aggressiveness ◽

Panel Data Regression ◽

Data Regression ◽

The Impact ◽

Research Period ◽

Positive Effect

The purpose of this study s to find out the impact of capital intensity, liquidity and sales growth on tax aggressiveness. This study uses a population in the coal mining sub-industry corporate listed on the IDX from 2016 to 2019 period. The sample selection technique used is purposive sampling, 14 coal mining sub-industry corporate were selected and the research period was 4 years. Therefore, as many as 56 samples were obtained in this study. The data analysis method used is panel data regression analysis using EViews 11 software. The results show that capital intensity, liquidity and sales growth affect tax aggressiveness simultaneously. Partially, liquidity has a positive effect on tax aggressiveness, while capital intensity and sales growth do not affect tax aggressiveness.

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REVIEW AND ANALYSIS OF LESSONS LEARNED HANDWRITING EXPERTISE AS A WAY TO IDENTIFY PROBLEMS AND WAYS TO SOLVE THEM IN EXISTING METHODS OF HANDWRITING RESEARCH

Krasnoyarsk Science ◽

10.12731/2070-7568-2019-3-29-44 ◽

2019 ◽

pp. 29-44

Author(s):

Vladlena Vyacheslavovna Lozben ◽

Luybov Vadimovna Gajkova

Keyword(s):

Information Security ◽

Simulation Modeling ◽

Lessons Learned ◽

Comparative Characteristic ◽

Scientific Methods ◽

Biometric Systems ◽

Analysis And Synthesis ◽

The Impact ◽

Constant Improvement ◽

Handwriting Research

In today’s environment, information security needs constant improvement. Therefore, biometric technologies are becoming increasingly important as a key area of information protection, contributing to the widespread introduction of biometric systems across firms and organizations. Purpose: in the course of handwriting research, human participation is a prerequisite for handwriting expertise, which entails certain problems in the field of biometric expertise, the emphasis on which is contained in the article. Methodology: tools and methods are considered to reduce the impact of problems on the process of handwriting examination: popular scientific methods of phase and case analysis and synthesis; Mathematical and simulation modeling methods and tools. Results: in order to identify approaches to reducing subjectivity of expert’s conclusions, a review and analysis of existing solutions was carried out, as a result of which a comparative characteristic of approaches to solving the problem of handwriting examination was drawn up. Scope of results: the results of this study will help the organization’s leadership in information security.

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Imaginary Worlds: The Status of Simulation Modeling in Claims for Cost-Effectiveness In Diabetes Mellitus

INNOVATIONS in pharmacy ◽

10.24926/iip.v7i2.440 ◽

2016 ◽

Vol 7 (2) ◽

Author(s):

Paul C Langley ◽

Taeho Greg Rhee

Keyword(s):

Diabetes Mellitus ◽

Cost Effectiveness ◽

Simulation Modeling ◽

Decision Makers ◽

The Past ◽

The Status ◽

The Impact

Over the past 20 years a number of simulations or models have been developed as a basis for tracking and evaluating the impact of pharmacological and other interventions in type 1 and type 2 diabetes mellitus. These models have typically tracked the natural course of these diseases generating long-term composite claims for cost-effectiveness. These claims can extend over the lifetime of the modeled patient cohort. Set against the standards of normal science, however, these claims lack credibility. The claims presented are all too often either immune to failure or are presented in a form that is non-testable. As such they fail to meet the key experimental requirements of falsification and replication. Unfortunately, there is a continuing belief that long-term or lifetime models are essential to decision-making. This is misplaced. The purpose of this review is to argue that there is a pressing need to reconsider the needs of health system decision makers and focus on modeled or simulated claims that are meaningful, testable, reportable and replicable in evaluating interventions in diabetes mellitus. Type: Commentary

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Reconsidering the sediment connectivity and sediment transfer under the influence of hydraulic structures and coal mining in the Jiu river basin

10.5194/egusphere-egu21-15317 ◽

2021 ◽

Author(s):

Gabriela Adina Morosanu ◽

Marta Cristina Jurchescu

Keyword(s):

Coal Mining ◽

River Basin ◽

Spatial Scales ◽

Sediment Supply ◽

Anthropogenic Factors ◽

Hydraulic Structures ◽

Water Runoff ◽

Sediment Sources ◽

Sediment Transfer ◽

The Impact

The key to an efficient basin management, taking into account both the liquid (river water runoff and its quality) and the solid (sediment sources and delivery) components lies in the way we approach the complex problem of sediment-generating areas in a river basin. This complexity is manifested both through the primary geomorphological processes that contribute to the mobilization of significant amounts of alluvia from the slopes and along the river valleys, and the various environmental and anthropogenic factors that act as restrictors or catalysts of sediment transfer.In the present study, we aim to analyze the various categories of anthropogenic factors, operating at different spatial scales (local or at subcatchment/river sector level), which contribute, together with the intrinsic geomorphological potential, to the sediment supply or, conversely, to the inhibition of erosion, transport and accumulation processes.Tracking sediment mobilization, transfer, intermediate storage and final delivery in a lithologically and geomorphologically complex environment, such as the Jiu River Basin (10,070 km2), located in SW Romania, is a difficult task which can become even more challenging when we factor in the contribution of some additional elements of an anthropic nature. In our study area, represented by a Carpathian and Danubian river basin, some of the most significant issues impacting the research include, on the one hand, the existence of reservoirs and dams, the strengthening of anti-flood embankments or the presence of water diversions, to cite only hydrotechnical interventions, or the impact of coal mining on landforms, slope processes and sediment sources, on the other hand. &#160;All these factors can act locally or regionally and they can surpass the influence exerted by the natural factors, thus being responsible for the reduction, storage, or, on the contrary, for the acceleration of specific hydro-sedimentary fluxes on certain paths.In order to connect these two categories of potential factors regulating sediment generation and transfer, the methodological approach consists in evaluating the internal &#8211; geomorphic upstream-downstream connectivity in relation/contrast with the disruptive anthropogenic factors. The proposed workflow can be divided in two steps: 1) the identification of the upstream sediment generating areas which are most connected to the downstream delivery/ storage/ accumulation areas (river network and river mouth) by applying the connectivity index (IC) proposed by Cavalli et al. (2013); and 2) the evaluation of potential hotspot areas exhibiting the highest degree of connectivity, as seen through the lens of the additional coupling or decoupling effects induced by the anthropic activities specific to the Jiu river basin: hydraulic structures and coal mining.Outcome discussions will focus on mapping problematic sediment production, storage and transfer sectors, as evidenced by the impact of hydrotechnical works and artificial landforms from coal mining on the connectivity potential of the Jiu river basin.

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Quantifying the Impacts of Climate Change, Coal Mining and Soil and Water Conservation on Streamflow in a Coal Mining Concentrated Watershed on the Loess Plateau, China

Water ◽

10.3390/w11051054 ◽

2019 ◽

Vol 11 (5) ◽

pp. 1054 ◽

Cited By ~ 6

Author(s):

Qiaoling Guo ◽

Yaoyao Han ◽

Yunsong Yang ◽

Guobin Fu ◽

Jianlin Li

Keyword(s):

Climate Change ◽

Coal Mining ◽

Loess Plateau ◽

Water Conservation ◽

Soil And Water Conservation ◽

The Loess Plateau ◽

Annual Streamflow ◽

Significant Downward Trend ◽

The Impact ◽

Soil And Water

The streamflow has declined significantly in the coal mining concentrated watershed of the Loess Plateau, China, since the 1970s. Quantifying the impact of climate change, coal mining and soil and water conservation (SWC), which are mainly human activities, on streamflow is essential not only for understanding the mechanism of hydrological response, but also for water resource management in the catchment. In this study, the trend of annual streamflow series by Mann-Kendall test has been analyzed, and years showing abrupt changes have been detected using the cumulative anomaly curves and Pettitt test. The contribution of climate change, coal mining and SWC on streamflow has been separated with the monthly water-balance model (MWBM) and field investigation. The results showed: (1) The streamflow had an statistically significant downward trend during 1955–2013; (2) The two break points were in 1979 and 1996; (3) Relative to the baseline period, i.e., 1955–1978, the mean annual streamflow reduction in 1979–1996 was mainly affected by climate change, which was responsible for a decreased annual streamflow of 12.70 mm, for 70.95%, while coal mining and SWC resulted in a runoff reduction of 2.15 mm, 12.01% and 3.05mm, 17.04%, respectively; (4) In a recent period, i.e., 1997–2013, the impact of coal mining on streamflow reduction was dominant, reaching 29.88 mm, 54.24%. At the same time, the declining mean annual streamflow induced through climate change and SWC were 13.01 mm, 23.62% and 12.20 mm, 22.14%, respectively.

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Water Preservation and Conservation above Coal Mines Using an Innovative Approach: A Case Study

Energies ◽

10.3390/en13112818 ◽

2020 ◽

Vol 13 (11) ◽

pp. 2818

Author(s):

Yujun Xu ◽

Liqiang Ma ◽

Yihe Yu

Keyword(s):

Coal Mining ◽

Water Conservation ◽

Large Scale ◽

Influencing Factor ◽

Mining Area ◽

Mining Operations ◽

Narrow Strip ◽

Geological Conditions ◽

The Impact

To better protect the ecological environment during large scale underground coal mining operations in the northwest of China, the authors have proposed a water-conservation coal mining (WCCM) method. This case study demonstrated the successful application of WCCM in the Yu-Shen mining area. Firstly, by using the analytic hierarchy process (AHP), the influencing factors of WCCM were identified and the identification model with a multilevel structure was developed, to determine the weight of each influencing factor. Based on this, the five maps: overburden thickness contour, stratigraphic structure map, water-rich zoning map of aquifers, aquiclude thickness contour and coal seam thickness contour, were analyzed and determined. This formed the basis for studying WCCM in the mining area. Using the geological conditions of the Yu-Shen mining area, the features of caved zone, water conductive fractured zone (WCFZ) and protective zone were studied. The equations for calculating the height of the “three zones” were proposed. Considering the hydrogeological condition of Yu-Shen mining area, the criteria were put forward to evaluate the impact of coal mining on groundwater, which were then used to determine the distribution of different impact levels. Using strata control theory, the mechanism and applicability of WCCM methods, including height-restricted mining, (partial) backfill mining and narrow strip mining, together with the applicable zone of these methods, were analyzed and identified. Under the guidance of “two zoning” (zoning based on coal mining’s impact level on groundwater and zoning based on applicability of WCCM methods), the WCCM practice was carried out in Yu-Shen mining area. The research findings will provide theoretical and practical instruction for the WCCM in the northwest mining area of China, which is important to reduce the impact of mining on surface and groundwater.

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Hindcasting and forecasting of regional methane from coal mine emissions in the Upper Silesian Coal Basin using the online nested global regional chemistry–climate model MECO(n) (MESSy v2.53)

Geoscientific Model Development ◽

10.5194/gmd-13-1925-2020 ◽

2020 ◽

Vol 13 (4) ◽

pp. 1925-1943 ◽

Cited By ~ 1

Author(s):

Anna-Leah Nickl ◽

Mariano Mertens ◽

Anke Roiger ◽

Andreas Fix ◽

Axel Amediek ◽

...

Keyword(s):

Coal Mining ◽

Spatial Resolution ◽

Radiative Forcing ◽

Climate Model ◽

Mitigation Strategies ◽

Climate Mitigation ◽

Coal Basin ◽

Airborne Measurements ◽

Upper Silesian Coal Basin ◽

The Impact

Abstract. Methane is the second most important greenhouse gas in terms of anthropogenic radiative forcing. Since pre-industrial times, the globally averaged dry mole fraction of methane in the atmosphere has increased considerably. Emissions from coal mining are one of the primary anthropogenic methane sources. However, our knowledge about different sources and sinks of methane is still subject to great uncertainties. Comprehensive measurement campaigns and reliable chemistry–climate models, are required to fully understand the global methane budget and to further develop future climate mitigation strategies. The CoMet 1.0 campaign (May to June 2018) combined airborne in situ, as well as passive and active remote sensing measurements to quantify the emissions from coal mining in the Upper Silesian Coal Basin (USCB, Poland). Roughly 502 kt of methane is emitted from the ventilation shafts per year. In order to help with the flight planning during the campaigns, we performed 6 d forecasts using the online coupled, three-time nested global and regional chemistry–climate model MECO(n). We applied three-nested COSMO/MESSy instances going down to a spatial resolution of 2.8 km over the USCB. The nested global–regional model system allows for the separation of local emission contributions from fluctuations in the background methane. Here, we introduce the forecast set-up and assess the impact of the model's spatial resolution on the simulation of methane plumes from the ventilation shafts. Uncertainties in simulated methane mixing ratios are estimated by comparing different airborne measurements to the simulations. Results show that MECO(3) is able to simulate the observed methane plumes and the large-scale patterns (including vertically integrated values) reasonably well. Furthermore, we obtain reasonable forecast results up to forecast day four.

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