Acta Montanistica Slovaca最新文献_第2页

Coal and Gas Outburst Risk Assessment Using Cluster Analysis Method 基于聚类分析法的煤与瓦斯突出危险性评价

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.06

引用次数: 0

Disposal of the Abandoned Mine Workings of Uranium Mines – Case Study of Rožná I Mine, Czech Republic 铀矿废弃地的处置——以捷克共和国Rožná I矿为例

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.03

{"title":"Disposal of the Abandoned Mine Workings of Uranium Mines – Case Study of Rožná I Mine, Czech Republic","authors":"","doi":"10.46544/ams.v28i2.03","DOIUrl":"https://doi.org/10.46544/ams.v28i2.03","url":null,"abstract":"Having abandoned mine workings, the closure strategy of mine working openings is important in terms of maintaining long-term stability. The paper describes the process of closing the mine workings in the uranium deposit Rožná using unconsolidated backfill. Before backfilling, it is vital to carry out preparatory work underground for ecological, technological or economic reasons. The mine workings backfilling using unconsolidated backfill is preceded by calculations to determine the quantity of the backfill. The stability of the mine workings opening is achieved using a closing sinking platform made of reinforced concrete. The abandonment procedure is framed within the legislation of the Czech Republic, grounded in the handbook by the National Coal Board of Great Britain (NCB, 1982), and has been gradually amended according to the experience with disused mine workings. The Czech legislation dealing with mine abandonment is very advanced and may be applied to modify foreign legislation. The abandonment procedure based on Decree 52 (1997) proposed in this paper is complemented by safety features such as micropilots in the sinking platform or shaft lining check-up before the backfill. The proposed method is applicable in mines with analogous specific conditions, such as mines free of gas hazards and coal dust. The paper concludes with an analysis of risks likely to occur due to incorrect mine closures.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Persistence in International Energy Prices 1960-2023 1960-2023年国际能源价格的持续性

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.14

{"title":"Persistence in International Energy Prices 1960-2023","authors":"","doi":"10.46544/ams.v28i2.14","DOIUrl":"https://doi.org/10.46544/ams.v28i2.14","url":null,"abstract":"This paper examines the persistence of energy prices in international markets and its implications for market participants and policymakers. Using the ARFIMA model and log-periodogram regression technique, we estimate the long memory parameter in energy price indices. Our findings confirm the persistence in energy prices, indicating that past price movements have a lasting impact on future prices. For market participants, understanding the persistence of energy prices is crucial for developing effective trading strategies and risk management measures. The long-lasting effects of past price movements suggest the need for preparedness in the face of extended periods of price volatility. Policymakers can also benefit from this knowledge by implementing measures to stabilize energy markets and mitigate the impacts of price shocks. Furthermore, our study highlights the importance of incorporating the persistence of shocks in energy price forecasting models. By accounting for the long-lasting effects of past price movements, these models can improve the accuracy of price forecasts and aid in decision-making for market participants. While our study provides valuable insights into the persistence of energy prices, further research is needed to investigate the root causes of persistence and its implications in a rapidly changing global economic environment. Additionally, exploring the individual factors that influence energy price indices can enhance our understanding of their dynamics and improve prediction accuracy. Overall, our findings contribute to the existing literature by confirming the presence of persistence in energy prices and providing valuable insights for market participants and policymakers. Further research in this area can offer more pragmatic advice and enhance decision-making in the energy markets.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":"394 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the development of energy consumption of electricity and fuels in Slovakia 斯洛伐克电力和燃料能源消费发展分析

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.11

引用次数: 0

Oppositional Coyote Optimization based Feature Selection with Deep Learning Model for Intrusion Detection in Fog-Assisted Wireless Sensor Network 基于对抗土狼优化的深度学习模型在雾辅助无线传感器网络入侵检测中的应用

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.18

{"title":"Oppositional Coyote Optimization based Feature Selection with Deep Learning Model for Intrusion Detection in Fog-Assisted Wireless Sensor Network","authors":"","doi":"10.46544/ams.v28i2.18","DOIUrl":"https://doi.org/10.46544/ams.v28i2.18","url":null,"abstract":"Recently, Wireless Sensor Networks (WSN) and the Internet of Things (IoT) become widespread in several real-time applications. Since IoT devices have generated a huge amount of data, the processing of data at the cloud server leads to high delay. To reduce the delay, fog-assisted WSN can be developed where the Fog Nodes are kept at the edge of the network nearer to the client. Besides, security becomes a challenging issue in fog-assisted WSN and can be accomplished by using Intrusion Detection System (IDS). This paper presents an Oppositional Coyote Optimization based feature selection with Cat Swarm Optimization based Bidirectional Gated Recurrent Unit (OCOA-CSBiGRU) for intrusion detection in fog-assisted WSN. The intention of the OCOA-CSBiGRU technique is to identify the occurrence of intrusions in the fog-assisted WSN by the use of feature selection and classification models. The proposed OCOA-CSBiGRU technique initially designs a novel OCOA-based feature selection technique for the optimal selection of features. Besides, the BiGRU model is utilized for the detection and classification of intrusions. In order to improve the detection efficiency of the BiGRU model, the Cat Swarm Optimization (CSO) algorithm has been utilized. A comprehensive experimental analysis is carried out on benchmark datasets, and the results indicatebetter outcomes of the OCOA-CSBiGRU technique over the recent methods interms of different metrics.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Methodology of designing blasting works in open pit mining in terms of their impact on construction objects 露天采矿爆破工程对施工对象影响的设计方法

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.07

引用次数: 0

Eocene Kohat Formation suitability as an aggregate from Kohat Range, Sub-Himalayas, Pakistan, based on outcrop, petrographic and geotechnical properties 基于露头、岩石学和岩土力学性质的巴基斯坦亚喜马拉雅地区Kohat山脉始新世Kohat组骨料适宜性研究

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.02

{"title":"Eocene Kohat Formation suitability as an aggregate from Kohat Range, Sub-Himalayas, Pakistan, based on outcrop, petrographic and geotechnical properties","authors":"","doi":"10.46544/ams.v28i2.02","DOIUrl":"https://doi.org/10.46544/ams.v28i2.02","url":null,"abstract":"This paper evaluates the physicochemical and mechanical characteristics of the Limestone of the Kohat Formation. The Eocene Kohat limestone is generally exposed in the Kohat, Hangu, and Bannu districts. Kohat Formation limestone is well exposed throughout the Northern Kohat fold and thrust belt at Togh Bala village. It is cream to grey, hard, compact, well-bedded and fossiliferous. Kohat Formation has been identified into two lithofacies which are from base to top calcareous shale lithofacies with large benthic foraminifera and limestone lithofacies. The faunal assemblage indicates that the Kohat Formation was deposited in an inner to middle shelf environment. The petrographic analyses of samples of the Kohat Formation depict that it principally consists of calcite (60-90%) with a small to trace assemblage of dolomite (0-3%), ungraded quartz (0-1.5%), opaque minerals (0-1.2%) and fossils (8-40%). Aggregate physical properties like water absorption (0.88%), specific gravity (2.69), soundness (2.55%), Los Angeles abrasion value (23.06%), aggregate crushing value (11.56%), aggregate impact value (12.68%), flaky index (9.90%), elongation index (12.76%) and coating and stripping values (96.27%) conform to available standards. Our results indicate that Kohat Limestone is safe in terms of Alkali Carbonate Reactivity (ACR) and Alkali-Silica Reactivity (ASR). The facies, thin section study, geochemical, and geotechnical understanding of Kohat Formation indicate that these aggregate deposits are potential aggregate sources for ballast (railway), road, building material, concrete, mortar and other mega projects for connecting Asia and Europe.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship between Variations in Valuation Methodologies: Evidence from Polish Construction Market 估价方法差异之间的关系:来自波兰建筑市场的证据

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.05

{"title":"Relationship between Variations in Valuation Methodologies: Evidence from Polish Construction Market","authors":"","doi":"10.46544/ams.v28i2.05","DOIUrl":"https://doi.org/10.46544/ams.v28i2.05","url":null,"abstract":"Making investment decisions in modern conditions is quite complicated. On the example of the construction industry, the article tests the approach based on WACC and WARA analyses. The risk and profitability of the specified markets were analyzed based on the Efficient Frontier method. The Polish market and the group of Euronext markets were selected for comparison. The necessity of calculation of WARA based on only significant assets was determined. The differentiation between WARA and WACC in the Polish construction market can be overcome by maximizing goodwill and intangible assets and minimizing tangible assets. It reveals problems not in the stock market, but in the industry and the economy as a whole, particularly the lack of functioning markets such as the stock market for individual assets. The role of intangibles is different for Euronext markets. On the other hand, the requirement of the international accounting standards to transfer goodwill from assets to \"other income\" in case of a negative value (bad will) makes adequate consideration of goodwill in the WARA model virtually impossible. Another problem is a calculation of relative weights of assets in conditions of occurrence of both positive and negative values, which creates prerequisites for different approaches and interpretations. Building material that is used in the construction industry tries to improve the environment. the source of building materials are natural resources such as sandstone.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Catalytic cracking of heavy hydrocarbons on modified natural zeolite of the Shankanai deposit (Kazakhstan) with heteropoly acids 杂多酸在哈萨克斯坦山卡奈矿天然沸石上催化裂化重烃

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.09

{"title":"Catalytic cracking of heavy hydrocarbons on modified natural zeolite of the Shankanai deposit (Kazakhstan) with heteropoly acids","authors":"","doi":"10.46544/ams.v28i2.09","DOIUrl":"https://doi.org/10.46544/ams.v28i2.09","url":null,"abstract":"The purpose of this research work is to study the main aspects of catalytic cracking of heavy hydrocarbons on modified natural zeolite of the Shankanai deposit (Kazakhstan) with heteropoly acids. The leading methodological approach in this research work is a combination of a systematic analysis of the main aspects of performing catalytic cracking of heavy hydrocarbons with a practical study of the features of the functioning of the Shankanai deposit for obtaining and further practical use of modified natural zeolite and involving scientific experiments to determine the prospects for performing this kind of modifications, for the subsequent use of these zeolites in the processes of catalytic cracking of heavy hydrocarbons. The results obtained in this scientific study are clear evidence of the fact that more light oil fractions are obtained as a result of the catalytic cracking process using modified natural zeolites as a catalyst than as a result of thermal cracking under other similar initial conditions. The results obtained in this research work and the conclusions formulated on their basis are of significant practical importance from the standpoint of the prospects for the development of the Shankanai deposit and the use of the zeolite extracted from it after its modification in the processes of catalytic cracking of heavy hydrocarbons.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the dewatering performance of red sludge with alternative methods in Eti Aluminum Plant in Seydisehir, Konya province, Turkey 用替代方法改善土耳其科尼亚省塞迪塞希尔Eti铝厂赤泥的脱水性能

4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-09-19 DOI: 10.46544/ams.v28i2.15

{"title":"Improving the dewatering performance of red sludge with alternative methods in Eti Aluminum Plant in Seydisehir, Konya province, Turkey","authors":"","doi":"10.46544/ams.v28i2.15","DOIUrl":"https://doi.org/10.46544/ams.v28i2.15","url":null,"abstract":"Recently, alumina demand has increased significantly due to the increment of usage area of aluminum in the world. One ton of red sludge on dry bases has come out as a bauxite residue in the course of 1 ton of alumina and 0.5 tons of aluminum production respectively. Especially the high liquid ratio significantly reduces the life of the red sludge dam used as a disposal area. In this study, alternative techniques have been investigated to improve the dewatering performance of red sludge in ETI Aluminum Inc. For this purpose, the vacuum rotary drum filter, decanter centrifuge, and filter press methods have been searched, and the effects on ETI red sludge dewatering properties have been obtained. The dewatering studies have been performed not only at the laboratory scale but also at the pilot scale to determine the optimum technique and to achieve the most efficient performance. As a result of dewatering the 30% solids red sludge with vacuum rotary drum filter, decanter centrifuge, and press filter methods, solids ratios of 48%, 65%, and 70% were obtained, respectively. While the amount of caustic in the red sludge produced by the present method was between 1.5 and 3%, the amount of caustic remaining in the cake was reduced to 0.22%, 0.15%, and 0.95%, respectively, by vacuum filtration, decanter centrifuge, and press filter methods. Thus, reducing the amount of caustic in the red sludge has reduced its negative impact on the environment, and a significant amount of caustic has been recovered.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135010805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0