Acta Montanistica Slovaca最新文献_第10页

Life Cycle Assessment and its Application to the Aviation Sector 生命周期评价及其在航空领域的应用

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI: 10.46544/ams.v27i4.06

{"title":"Life Cycle Assessment and its Application to the Aviation Sector","authors":"","doi":"10.46544/ams.v27i4.06","DOIUrl":"https://doi.org/10.46544/ams.v27i4.06","url":null,"abstract":"Air transport plays an important role in multiple aspects of human lives, such as business and leisure. Air transport constitutes an important part of the global economy and, at the same time, has a crucial role in both domestic and international transport. It provides people and goods with connectivity that cannot be challenged by any other means of transport and therefore offers crucial services within the modern economy and society. On the other hand, it is the second biggest polluter among the transport methods. Therefore, there is a need to switch to more sustainable solutions within the aviation sector. To choose the right options, a Life cycle assessment can be a useful tool for evaluating environmental impact. Most of the studies concerned with the environmental impact of aviation focus on the pollutants emitted during the flight, ignoring other direct and indirect effects on the environment. The extraction of raw materials needed for the construction of aviation infrastructure, its manufacturing, operation and maintenance and fuel production is often ignored. In this paper, the first life cycle assessment methodology is explained, along with its benefits and the important role played by the mining industry within LCA. In the next part, we present a possible model for evaluating the overall environmental impact of air transport, divided into four main parts – production, operation, maintenance and liquidation, followed by the analysis of the social aspect of the impact evaluation.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48275539","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

DEM-based directional statistical examination of linear features: the case study in Bükk Mountains (NE Hungary) 基于dem的线性特征的定向统计检验:以匈牙利东北部b<s:1> kk山脉为例

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI: 10.46544/ams.v27i4.19

{"title":"DEM-based directional statistical examination of linear features: the case study in Bükk Mountains (NE Hungary)","authors":"","doi":"10.46544/ams.v27i4.19","DOIUrl":"https://doi.org/10.46544/ams.v27i4.19","url":null,"abstract":"Analysis of linear features such as faults, valleys, interfluves, and escarpments is a commonly used method in structural morphologic and structural geologic research. \u0000The aim of our study was to investigate the relationship between the linear features by directional statistical analysis, and we also examined the applicability of this method in a research area with a complex geological structure. The study area was the Bükk Mountains (NE Hungary) and its two catchment areas. The analysed features (drainage network, lineaments and dominant aspect) were derived from a DEM.\u0000As a result of the research, we found that in the Sajó catchment, the direction of lineaments does not coincide with the direction of the valleys and structural elements, nor the dominant aspect, while in the Tisza watershed, the orientation of the main structural features notably differs from the direction of the other 3 feature sets. \u0000In our opinion, this finding can be explained in three possible ways. The first possibility is that the applied method does not provide reliable results in a geologically complex area. The second explanation is that regional structural processes may affect drainage network evolution and the dominant aspect. The other explanation is that there may have been unknown structural elements in the research area, which affect the recent geomorphological settings and processes. \u0000The results draw attention to the fact that besides the unmapped faults, there might be other factors affecting geomorphological processes (e.g., resistance to denudation of different rock types, microclimate), which have not been taken into account so far. The research was based only on directional statistical examinations; further geological and geophysical analyses are required to prove the existence of these hypothetical morphotectonic features.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41297623","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

Driving Features of Tapered-Prismatic Piles and Their Resistance to Static Loads 锥形棱柱桩的打桩特性及其抗静载性能

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI: 10.46544/ams.v27i4.01

{"title":"Driving Features of Tapered-Prismatic Piles and Their Resistance to Static Loads","authors":"","doi":"10.46544/ams.v27i4.01","DOIUrl":"https://doi.org/10.46544/ams.v27i4.01","url":null,"abstract":"The field tests of large-scale models of driven tapered prismatic and prismatic piles for driving static vertical and horizontal loads are presented. Field tests were carried out on sandy loam on piles models (M 1:3) with different lengths and cross-sections of the pyramidal segment. It has been established that the driving of tapered-prismatic piles is accompanied by both large (by 1.10-1.60 times) and lower (by 8.0-37.0%) energy consumption for their driving in comparison with conventional prismatic and pyramidal piles. It was also revealed that under the vertical pressing load, the bearing capacity of the tapered-prismatic piles is 1.09-1.48 times, and under the horizontal static load, it is 1.17-1.80 times higher than the prismatic pile. It has been established that with an increase in the length of the pyramidal part of the experimental piles, there is an increase in their bearing capacity by 1.12-1.34 times. Equations are proposed for determining the bearing capacity of tapered-prismatic piles. The research results serve as the basis for the development of recommendations for the calculation and design of tapered-prismatic piles. The revealed features of the behaviour of tapered-prismatic piles allow to reasonably assign the length and dimensions of the cross-section of their pyramidal segment.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41277973","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: 1

The synthesis of biographene oxide from the graphitic structure of PKS, EFB and OPF 由PKS、EFB和OPF的石墨结构合成生物烯氧化物

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI: 10.46544/ams.v27i4.03

{"title":"The synthesis of biographene oxide from the graphitic structure of PKS, EFB and OPF","authors":"","doi":"10.46544/ams.v27i4.03","DOIUrl":"https://doi.org/10.46544/ams.v27i4.03","url":null,"abstract":"The increasing global demand for graphite and environmental issues due to the extraction of natural graphite has become motivations to improve the process development of synthetic graphite. However, the conventional process for synthetic graphite production requires high temperatures, extreme process conditions, and expensive equipment. This drives further research work on finding more straightforward options. This research study a simpler direct transformation method using Palm Kernel Shell (PKS), Oil Palm Fond (OPF, Empty Fruit Bunch (EFB) as carbon precursors via a catalytic graphitization process. The process involved raw material preparation, carbonization process, Iron-Silica catalyst impregnation and graphitization. Three parameters were observed, including graphitization temperature, type of raw material and amount of Iron catalyst loadings. The Bio-synthetic graphite produced were later undergone an “improved method” to form Graphene Oxide (GO). The graphitic carbon produced was characterized using X-Ray Diffraction (XRD) and Raman spectroscopy, Brunauer-Emmet-Teller (BET) Surface Area and High-Resolution Transmission Electron Microscope (HRTEM). Overall successful transformation of amorphous carbon to graphitic structure for PKS, EFB, and OPF was evidenced by the XRD pattern and Raman spectra. It was found that PKS was the greatest carbon precursor for the graphitization process, followed by EFB and OPF. The former exhibited the nearest interlayer spacing to natural graphite with the lowest Id/Ig value. This can be seen from the HRTEM image of the PKS-1300-40 sample. The results attributed to the highest percentage of lignin in PKS rather than in EFB and OPF. A very significant transformation of bio-synthetic graphite to GO powder was also evidenced in XRD patterns and RAMAN spectroscopy. As for bio-synthetic graphene PKS, EFB and OPF depicted XRD patterns with broad peak centring around 2𝜃~25°. It was found an absence of GO characteristic peak at 2𝜃~10.7°.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49485802","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

Listvenite as gemstone: the Antina Čuka occurrence (Eastern Serbia) 作为宝石的Listvenite：AntinaČuka产状（塞尔维亚东部）

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI: 10.46544/ams.v27i4.14

引用次数: 0

An empirical study about the relationship between lean management and industry 4.0 精益管理与工业4.0关系的实证研究

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI: 10.46544/ams.v27i4.07

{"title":"An empirical study about the relationship between lean management and industry 4.0","authors":"","doi":"10.46544/ams.v27i4.07","DOIUrl":"https://doi.org/10.46544/ams.v27i4.07","url":null,"abstract":"Lean Management and its tools have been widely used for years. Lean Management aims at streamlining the flow of value while continually seeking to reduce the resources required to produce a given set of products. Although the adoption of Lean is not a new concept, few organizations fully understand the philosophy behind its practices and principles. The relationship between Industry 4.0 and Lean Management has been increasingly evidenced in operations management research. To create a better understanding, the main point of interest for this work is to investigate the link and integration between Industry 4.0 and Lean Management, as well as examine its implications on performance and the environmental factors influencing these relationships in some companies especially focusing on the mining industry. Based on the literature review, a questionnaire was created about Lean Management and Industry 4.0, which was applied in some companies in Brazil and Hungary, most of them from the mining industry. The aim of this paper is to evaluate the application of combining both methodologies, Lean Management and Industry 4.0. The unique contribution of the paper is to see the common areas of Lean and Industry 4.0 where there are research and knowledge, but the application level at the companies is low.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42432033","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

Social Media Usage as a solution for financial problems of European SMEs: International Comparison of Firms in Iron and Mining Industries 社会媒体的使用作为欧洲中小企业财务问题的解决方案:钢铁和矿业企业的国际比较

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI: 10.46544/ams.v27i4.12

M. Civelek, M. Kasarda, L. Hajduk, A. Szomolányi

{"title":"Social Media Usage as a solution for financial problems of European SMEs: International Comparison of Firms in Iron and Mining Industries","authors":"M. Civelek, M. Kasarda, L. Hajduk, A. Szomolányi","doi":"10.46544/ams.v27i4.12","DOIUrl":"https://doi.org/10.46544/ams.v27i4.12","url":null,"abstract":"Due to operating in the mining and iron sectors with fierce competition and encountering more financial obstacles compared to larger enterprises, SMEs (small and medium-sized enterprises) become more likely to face business failures, have lower financial performance and have high financial risk. To overcome those financial impediments and become more competitive against their rivals, social media usage might be a solution. This is because even under the conditions of the covid-19 pandemic, social media has also stimulated online purchasing behaviours of customers and has been used as an effective tool by SMEs for marketing purposes. However, SMEs' usage of these channels might differ depending on the countries where they are located, so their impacts on financial obstacles might be different. In this regard, this research examines whether the impacts of social media usage on the financial problems of SMEs differ depending on their location. To achieve this goal, the researchers employ an online survey and direct it to the executives of 1156 Czech, Slovakian and Hungarian SMEs. The researchers apply Ordinal Logistic Regression with the Logit function in SPSS statistical tool for analyzing purposes. The results confirm the fact that while differences do not exist among countries regarding the impact of social media usage on business failures, the effects of social media usage on financial performance and financial risk differ between Hungarian and Czech-Slovakian SMEs. Czech and Slovakian SMEs show similar attitudes in all of the analyzed variables.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48917098","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: 3

Impact of Discrete Fracture Characteristics on Longwall Top Coal Stability 离散裂隙特征对长壁顶板煤稳定性的影响

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2023-02-20 DOI: 10.46544/ams.v27i4.02

LE TienDung, Hong Quang Dao, VU DinhHieu

{"title":"Impact of Discrete Fracture Characteristics on Longwall Top Coal Stability","authors":"LE TienDung, Hong Quang Dao, VU DinhHieu","doi":"10.46544/ams.v27i4.02","DOIUrl":"https://doi.org/10.46544/ams.v27i4.02","url":null,"abstract":"Discrete fractures may exist in thick coal seam and significantly impact the top coal stability in the Longwall Top Coal Caving method (LTCC) both ahead of shield support (top coal fall) and behind shield support (top coal caving). The top coal stability in such conditions is not well understood in the literature and has been studied from either fall or caving behaviour. In this paper, a discontinuum-based numerical program is used to study longwall top coal stability when discrete fractures exist in coal seam and vary in characteristics (i.e., orientation, density, stiffness, strength, and intersecting fractures). The study demonstrates that the existence of discrete fractures decreases the top coal stability ahead of shield support, particularly in initial face extraction. The parametric study finds that when the fracture orientation makes an angle of 90 degrees to the positive x-axis, it has the least impact on top coal fall. When the fractures plunge into the mined-out area, they facilitate top coal caving and vice versa when they plunge into the unmined area. The study reveals that the fracture density is directly proportional to top coal fall and top coal caving. Meanwhile, the fracture stiffness and strength are inversely proportional to both top coal fall and caving. The study also demonstrates the important role of coal seam characteristics (strength, elastic modulus, and depth) in top coal fall. The findings from this paper can assist engineers in improving panel geometry design and roof control for efficient underground mining when discrete fractures exist and vary in a coal seam.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46081273","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: 1

Dynamic model of a longwall shearer with a chain haulage system 链牵引长壁采煤机动力学模型

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2022-12-08 DOI: 10.46544/ams.v27i3.03

{"title":"Dynamic model of a longwall shearer with a chain haulage system","authors":"","doi":"10.46544/ams.v27i3.03","DOIUrl":"https://doi.org/10.46544/ams.v27i3.03","url":null,"abstract":"Despite the pro-ecological policy, hard coal still is and for a long time will remain a valuable major source of energy in the world. It is usually found in the form of seams in underground mines. For many years, thin coal seams have been exploited on an increasingly large scale, therefore mines and machine manufacturers are looking for new, effective and safe methods of extraction. One of such methods is the use of a longwall system with a single-head shearer. This solution has been briefly described in the article, with special focus placed on the proprietary dynamic model of a longwall shearer with a chain haulage system. The model concerns a chain-hauled single-head shearer, but can be used to simulate coal ploughs, and to a certain extent, scraper and belt conveyors. There are models in the literature in which the chain is replaced by point masses. In the discussed model, the chain segments have been described as a continuously distributed mass, the value of which changes as the shearer travels along the wall. The shearer has been modelled as a rigid body with six degrees of freedom, placed on elastic skids. The load from cutting, loading and movement resistance has been taken into account in the model. The mathematical model has been saved in the form of scripts in Matlab. The set of scripts allows obtaining information about the behaviour of the shearer and the load on important structural nodes such as skids, chain and loaders fasteners or the driving shaft of the cutting head. The results also enable determining the power demand of the motors as well as calculating the required initial tension of the chain. The fully parametric model makes it possible to analyse the influence of a change in the values of significant parameters of the longwall working, drive units and shearer. This information is crucial at the stage of design construction and verification, which allows avoiding many errors in the prototype.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41991730","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

Influence of Vibration and Ground Deformation on Historic Structures: Case Study 振动和地面变形对历史建筑的影响:个案研究

IF 1.6 4区地球科学

Acta Montanistica Slovaca Pub Date : 2022-12-08 DOI: 10.46544/ams.v27i3.17

{"title":"Influence of Vibration and Ground Deformation on Historic Structures: Case Study","authors":"","doi":"10.46544/ams.v27i3.17","DOIUrl":"https://doi.org/10.46544/ams.v27i3.17","url":null,"abstract":"When discussing historic structures, a significant problem is how to preserve and protect these structures. The presented paper deals with some issues of the unfavourable impact of industrial activity on some historic structures. Long-term influences from the industrial activity are one of the common sources of damage observed in these structures. Due to the size and volume of such structures, they are characterized by very low resistance to vibration and ground deformations. At the same time, the high cultural and material value of historic structures necessitates their costly protection and repair. Knowing the origin of problems, one may take proper actions to protect them. This paper discusses two important types of impact typical for industrial areas, especially affected by mining, seismically induced vibrations and continuous ground deformations from underground extraction. The presented discussion is based on the case study examples of historical sites located in some industrial areas in the Czech Republic and Poland. They point to different sources of damage to those structures that may arise as well as a combined effect of mining-induced seismic events and land subsidence. The medieval Jeroným Mine represents an underground structure loaded with natural and technical seismicity. The paper also includes a short overview of the process of seismic loading evaluation and basic information about historic structures with respect to seismic standards and land surface subsidence caused by underground mining.","PeriodicalId":50889,"journal":{"name":"Acta Montanistica Slovaca","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2022-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44593706","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