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1
Graening, Lars, e Bernhard Sendhoff. "Shape mining: A holistic data mining approach for engineering design". Advanced Engineering Informatics 28, n. 2 (aprile 2014): 166–85. http://dx.doi.org/10.1016/j.aei.2014.03.002.
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Bartocci, Ezio, Jyotirmoy Deshmukh, Felix Gigler, Cristinel Mateis, Dejan Nickovic e Xin Qin. "Mining Shape Expressions From Positive Examples". IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems 39, n. 11 (novembre 2020): 3809–20. http://dx.doi.org/10.1109/tcad.2020.3012240.
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Kodama, Hiroyuki, Toshiki Hirogaki, Eiichi Aoyama e Keiji Ogawa. "Investigation of End-Milling Condition Decision Methodology Based on Data Mining for Tool Catalog Database". International Journal of Automation Technology 6, n. 1 (5 gennaio 2012): 61–74. http://dx.doi.org/10.20965/ijat.2012.p0061.
Testo completoAbstract (sommario):
Data mining supports decision making about reasonable end-milling conditions. Our research objective is to excavate new knowledge with mining effect by applying data mining techniques to a tool catalog. We use hierarchical and nonhierarchical clustering data mining with catalog data by applying multiple regression analysis and focusing on the catalog data shape element. We visually grouped end-mills on the basis of tool shape, considering the ratio of tool shape dimensions, by employing the K-means method. We found that factors related to blade length and full length ratio are effective in for making end-milling condition decisions. These factors have not previously been singled out through background knowledge or expert knowledge, but they were noticed as a data mining effect.
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Pysmennyi, Serhii, Mykhailo Fedko, Nataliia Shvaher e Serhii Chukharev. "Mining of rich iron ore deposits of complex structure under the conditions of rock pressure development". E3S Web of Conferences 201 (2020): 01022. http://dx.doi.org/10.1051/e3sconf/202020101022.
Testo completoAbstract (sommario):
The purpose of research is to increase the ore mass extraction ratio when mining rich iron ores by changing the shape of the stope chamber, as well as to substantiate its stable parameters under the conditions of the rock pressure manifestation. Used in mines existing methodologies for determining the structural elements of mining system are based on calculated equivalent spans of outcropping the stope chambers, which have a rectangular or tent shape. For the first time using the ANSYS software package, it has been determined that the formation of a compensation chamber of quasi-parabolic shape can significantly reduce the stresses concentration around the stope block. Thus, the formation of a stope chamber of a quasi-parabolic shape makes it possible to reduce vertical stresses as compared to horizontal ones without increasing horizontal pressure. When mining the extraction block, it is proposed to form the stope chamber of a quasi-parabolic shape with geometric parameters that directly depend on the parameters of the deposit, the depth of mining, and the direction of main stresses action. Dependences have been determined of the stresses value on the depth of mining and the physical properties of rocks, as well as on the length along the strike of the ore deposit. Thus, depending on the mining depth and length along the strike, rock pressure on the stope chamber of a quasi-parabolic shape decreases under non-uniform loading. The formation of a stope chamber of a quasi-parabolic shape will increase by 1.2 – 1.5 times the volume of pure ore that is recovered from the block.
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He, Fulian, Bingquan Liu, Liang Li, Xuhui Xu, Kai Lv, Wenli Zhai, Jiayu Song e Deqiu Wang. "Study on the Key Factors of Terminal Mining Line Layout in Repeated Mining of Close-Distance Thick Coal Seams". Advances in Materials Science and Engineering 2022 (12 settembre 2022): 1–12. http://dx.doi.org/10.1155/2022/9724275.
Testo completoAbstract (sommario):
In order to mater the reasonable layout basis of the terminal mining line position in the repeated mining of close-distance thick coal seams, taking Yan mine as the engineering background, we conducted theoretical analyses, numerical simulations, and field measurements to study the action mechanism of the stress arch. The results show that (1) with repeated mining, the shape of the left and right half arches of the stress arch changes in the order of time and space until it is stable; (2) the shape of the stress arch is highly related to the distribution of abutment pressure in the working face. If the shape is unchanged, the distribution of abutment pressure is unchanged; (3) in the final mining stage of repeated mining, when the shape of the right half arch is stable, the difference stagger distance of the terminal mining line has little effect on the distribution of abutment pressure of the working face where the front arch foot is located; (4) when the internal stagger distance between 3216 working face and terminal mining line of 4216 working face is greater than 22 m or the external stagger distance is greater than 30 m, 3216 working face is located in a relatively safe position. This study clarifies the key factors for the layout of terminal mining lines in close-distance thick coal seams, which can provide a scientific basis for similar projects.
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Wei, Qian. "Product Shape Design Scheme Evaluation Method Based on Spatial Data Mining". Mathematical Problems in Engineering 2022 (20 luglio 2022): 1–8. http://dx.doi.org/10.1155/2022/3231357.
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The stage of product modeling design implies a lot of complex tacit knowledge, which is the embodiment of the design concept centered on product modeling design and is also the hot spot and difficulty of modern design theory and method research. Aiming at the evaluation and decision of product modeling design scheme, a decision-making method of approaching ideal solution ranking based on grey relational analysis was proposed, which realized the convergence of tacit knowledge. The empty association rule is an important knowledge content of spatial data mining. A fuzzy genetic algorithm can solve the characteristics of random and nonlinear problems and solve the data mining problems of spatial association rules. The fuzzy genetic algorithm of discrete crossover probability and mutation probability is applied to data mining of spatial association rules in a spatial database, the coding method of the fuzzy genetic algorithm and the construction of fitness function are discussed, and the process of mining spatial association rules is given. The results show that the method of mining s association rules with the fuzzy genetic algorithm is feasible and has higher mining efficiency. This paper discusses the construction method of designing a decision support database based on linear regression and neural network and then proposes a decision method combining TOPSIS and grey relational analysis, which comprehensively considers the position and shape of the scheme data curve.
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Toyota, Hiroko, Daiki Ito, Shuya Suzuki, Ryohei Hara e Junxiang Wang. "Mapping vanished mountain shapes – The struggle between limestone mining and establishing a natural park at Mount Bukō –". Abstracts of the ICA 1 (15 luglio 2019): 1–2. http://dx.doi.org/10.5194/ica-abs-1-368-2019.
Testo completoAbstract (sommario):
<p><strong>Abstract.</strong> This report searches for the Japanese view of beauty and nature through a study of the mapping of the transformation of a mountain’s shape. A normal map primarily intends to express existing shapes, but this report maps the vanished shape of a mountain from the limestone mining of its slopes. This is done to consider how its vanished shape has impacted the Japanese view of beauty and nature. The mountain studied is Mount Bukō located in Chichibu City and Yokozemachi in Saitama Prefecture. Mount Bukō is suitable for limestone mining, and during the Edō Period, limestone was mined on this mountain to obtain material for mortar and fertilizer. In the Meiji Period, cement was used in Japan to construct buildings and surface roads, and limestone (raw material for cement) was produced and consumed in large quantities. During the Taishō Period, corporations started to mine vast quantities of limestone. At Mount Bukō, the shape of the mountain was heavily transformed by limestone mining (Figure 1,2).</p><p>However, during the 1940s, Mount Bukō was mentioned as a candidate site for a national park. In 1957, the entire area &ndash; including the mining site &ndash; was designated the Saitama Prefectural Natural Park. Parks are designated in Japan in imitation of Europe and America, and their major purposes are to preserve beautiful scenery and serve as places for residents’ recreational activities. Thus, by the Meiji Period, national parks such as Nikko National Park (which includes the Tōshōgū Shrine) were already being designated. Considering the above historical background, the movement to designate Mount Bukō as a park can be understood as an effort to preserve its scenery and provide a place for residents’ activities. But limestone mining continues to transform the shape of the mountain as, for example, a total of roughly 6.99 million tons of limestone were mined on Mount Bukō in 2016. By analyzing the facts of this case, this study can portray the Japanese consciousness of the change of the shapes of mountains and clarify the nature of their view of beauty and nature in mountains.</p><p>This paper reports on the preparation of a stereoscopic map based on topographical maps and photos created since the start of the Meiji Period, Chichibu <i>fudasho</i> temple drawings from the Edō Period, and the chronological mapping of the shape of the mountain before and since its designation as a park. Mapping using diverse source materials to represent exposed rock and landslides caused by limestone mining permits a detailed study that would be impossible based on topographical maps lacking contour lines, photographs, or drawings from one direction, primarily from the northern side of the mountain (Figure 3,4). This study shows which parts of the disappearing Mount Bukō are important to people and which parts of the remaining mountain shape they value highly. It also portrays the Japanese view of beauty and nature from a cultural perspective to aesthetically evaluate artificially formed “nature” as seen in temple gardens or bonsai.</p>
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Shu, Longyong. "Study on Gas Extraction Technology for Goaf Using L-Shaped Borehole on the Ground". Applied Sciences 14, n. 4 (17 febbraio 2024): 1594. http://dx.doi.org/10.3390/app14041594.
Testo completoAbstract (sommario):
This study aimed to examine gas extraction technology in the goaf of an L-shaped borehole in the mining fissure zone of a short-distance coal seam group. The numerical simulation method was used to analyze the failure law of overlying rock during mining, and a mathematical model was established for gas migration in the mining overburden. Finally, gas extraction tests were performed for the L-shaped borehole in the mining fissure zone. The results showed that as the coal mining project progressed, the damage area of the overlying strata in the goaf became larger, and the plastic damage area of the overlying rock along the strike had a saddle shape, being concave in the middle and convex at both ends. The closer the L-shaped borehole in the mining fissure zone was to the coal seam roof, the greater the amount of air leaking from the working face into the goaf, and the lower the overall gas concentration in the goaf. When the vertical distance of the L-shaped borehole was too high, the ability of the L-shaped borehole to control the gas concentration in the lower goaf was weakened. Moreover, the mining fracture zone was a good space for gas migration and storage. Thus, arranging the L-shaped borehole in this zone can greatly improve the efficiency of borehole gas extraction. According to the overlying rock conditions and mining conditions of Tunlan Mine, the L-shaped borehole was positioned 43 m away from the roof of the coal seam. The extraction rate of the L-shaped borehole reached 9.30 m3∙min−1, and the gas concentration in the corners of the working face was kept below 0.4%, yielding an excellent extraction effect.
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Qiao, Fukang, Xinqiu Fang, Ningning Chen, Minfu Liang, Gang Wu e Fan Zhang. "Research on Three-Dimensional Shape Curve Reconstruction Technology for a Scraper Conveyor on an Intelligent Working Face". Sensors 23, n. 21 (27 ottobre 2023): 8755. http://dx.doi.org/10.3390/s23218755.
Testo completoAbstract (sommario):
“Three straight and two flat” is the inevitable demand when realizing the intelligent mining of a fully mechanized mining face. To address the crucial technical issue of lacking accurate perception of the shape of the scraper conveyor during intelligent coal mining, a three-dimensional curvature sensor involving fiber Bragg grating (FBG) is used as a perceptive tool to conduct curve reconstruction research based on different local motion frames and to reconstruct the shape of the scraper conveyor. Firstly, the formation process of the ‘S’-shaped bending section of the scraper conveyor during the pushing process is determined. Based on the FBG sensing principle, a mathematical model between the variation in the central wavelength and the strain and curvature is established, and the cubic B-spline interpolation method is employed to continuously process the obtained discrete curvature. Secondly, based on differential geometry, a spatial curve reconstruction algorithm based on the Frenet moving frame is derived, and the shape curve prediction interpolation model is built based on a gated recurrent unit (GRU) model, which reduces the impact of the decrease in curve reconstruction accuracy caused by damage to some grating measuring points. Finally, an experimental platform was designed and built, and sensors with curvature radii of 6 m, 7 m, and 8 m were tested. The experimental results showed that the reconstructed curve was essentially consistent with the actual shape, and the absolute error at the end was about 2 mm. The feasibility of this reconstruction algorithm in engineering has been proven, and this is of great significance in achieving shape curve perception and straightness control for scraper conveyors.
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Wu, Wei Dong, Hua Liang Li e Hong Rui Xue. "Dynamic Analysis of Planetary Mechanism for the Cutting Part of Coal Shearer". Applied Mechanics and Materials 160 (marzo 2012): 356–60. http://dx.doi.org/10.4028/www.scientific.net/amm.160.356.
Testo completoAbstract (sommario):
The transmission load on planetary gear to the cutting part of coal mining machine is bigger, and the force is uneven stress while the gear driving. In order to solve this problem, and puts forward the coal mining machine cutting part planetary transmission gear contact dynamic meshing analysis method. This paper build entity modeling of coal minning machine cutting part transmission gear by established 2d model by CAXA and import PRO/E, and by using ABAQUS/Explicit as the simulation platform, assembly and analysis with dynamic meshing contact, get in gear stress of gear tooth distribution, and provide the basis to the gear shape design.
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Wang, Su, Hanpeng Wang, Zhide Wu, Mengtian Li e Wenbin Xing. "Physical simulation technologies and testing system for cavern shape control from single-well solution mining in rock salt". Review of Scientific Instruments 93, n. 12 (1 dicembre 2022): 125101. http://dx.doi.org/10.1063/5.0108039.
Testo completoAbstract (sommario):
The shape of the salt cavern is very important for the safe operation of gas storage facilities in rock salt. A physical simulation test is an effective means to study the shape control of salt caverns. To accurately simulate the process and parameters of single-well solution mining in rock salt, we developed simulation technologies and a testing system for cavern shape control. Based on the flow similarity principle, we established a sealing technology for dynamic-static disturbance and successfully replicated the solution mining process for forward and reverse circulations. Based on the requirement of protective fluid in the field, we developed a protection liquid unit to control the oil pad height to avoid overdissolution or uneven dissolution at the top of the salt cavern. From the principle of distance determination by laser and video, we developed a salt cavern shape visualization and micro-distance detection system that can realize the size measurement and real-time visualization of the salt cavern in pressurized corrosive environment. We put forward the control technology of the testing system that can achieve the integrated and collaborative control of inner and outer pipe spacing, water flow during injection–production circulations, and the height of protection fluid. Finally, we carried out a physical simulation test of solution mining for cavern shape control. The shape and size of the salt cavern from the test are in good agreement with the design. This study can provide an important basis for determining the optimal solution in mining technology and the parameters for cavern shape control.
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Hussein, Rana, Alberto Lerner, Andre Ryser, Lucas David Bürgi, Albert Blarer e Philippe Cudre-Mauroux. "GraphINC: Graph Pattern Mining at Network Speed". Proceedings of the ACM on Management of Data 1, n. 2 (13 giugno 2023): 1–28. http://dx.doi.org/10.1145/3589329.
Testo completoAbstract (sommario):
Graph Pattern Mining (GPM) is a class of algorithms that identifies given shapes within a graph, e.g., cliques of a certain size. Any area of a graph can contain a shape of interest, but in real-world graphs, these shapes tend to be concentrated in areas deemed skewed. Because mining skewed areas can dominate GPM computations, the overwhelming majority of state-of-the-art GPM techniques break such areas into many small parts and load balance them across servers. This paper takes a diametrically opposite approach: we suggest a framework that concentrates rather than divides the skewed areas. Our framework, called GraphINC, relies on two key innovations. First, it introduces a new graph partitioning scheme capable of separating the skewed area from the rest of the graph. Second, it offloads the skewed part onto a new class of hardware accelerator, a programmable network switch. We implemented our framework to leverage a commercial 100 Gbps switch and obtained results 6.5 to 52.4× faster thanks to our novel offloading technique.
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Zhang, Jianguo, Xiaofeng Qin, Shuaitao Liu, Haijian Su, Zhanbiao Yang e Guochuan Zhang. "Study on Overburden Fracture and Structural Distribution Evolution Characteristics of Coal Seam Mining in Deep Large Mining Height Working Face". Sustainability 15, n. 18 (6 settembre 2023): 13365. http://dx.doi.org/10.3390/su151813365.
Testo completoAbstract (sommario):
Coal mining has gradually entered the deep mining era, and large-height mining is an important way to mine thick coal seams in the deep. The high coal wall will inevitably make the distribution of the overburden structure in the coal mining face more complicated, and the large buried depth will also cause more intense mine pressure. The study of the distribution and evolution of the overburden structure and stress in the mining site can provide theoretical guidance for safe mining. In this work, a physical similarity modeling test was carried out based on the physical–mechanical parameters of overburden rock and similarity theory, taking the mining of a deep, large-height working face in Pingdingshan Coal Mine as an example. The results show that the deformation and breakage of overburden rock in deep, large-height workings occurring during mining is persistent and not only in a short period of time. The breakage form of overburden can be categorized into two types based on the deformation characteristics: (I) non-separation-induced type, and (II) separation-induced type. Among these, the breakage induced by separation can be divided into two categories: (i) dominated by self-weight stress, and (ii) affected by shear cracks. It also summarizes the form of the overburden structure and the structural morphology of the stope. The overburden structure shows a “combined cantilever beam structure-articulated rock-slab structure-non-articulated rock-slab structure”. Among these, the periodic breakage of the upper cantilever beam evolved articulated and non-articulated rock-slab structure in the lower part, which weakened the supporting effect of the lower gangue and further aggravated the breakage of the upper overburden rock. The shape of the main structure of the stope mainly depends on the fracture line from the advancing coal wall to the upper overburden: from a rectangular shape without collapse to a trapezoidal shape at the initial stage of collapse, to a trapezoidal shape with multiple steps after the main roof collapse.
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Yu, Kai, Zhaoxiang Mu e Jifeng Lu. "Research on the Model and Pattern of Community Opinion Dis-Semination Regarding Coal Mines". Mathematics 12, n. 24 (11 dicembre 2024): 3914. https://doi.org/10.3390/math12243914.
Testo completoAbstract (sommario):
Residents of coal mining communities include both coal mine workers and local residents, making the guidance of public opinion essential for maintaining social stability in such communities. Therefore, this paper utilizes an improved word2Vec model to extract factors influencing public opinion from a large number of accident cases. It then develops a coal mining community public opinion dissemination model based on game theory, focusing on two groups: official media and opinion leaders. By integrating cellular automata (CA) and agent-based modeling, this study examines the dissemination patterns of public opinion in coal mining communities. The simulation results and practical applications indicate that public opinion in coal mining communities spreads rapidly and can be effectively shaped. Positive guidance from official media plays a crucial role in directing public opinion. However, as interactions evolve, public opinion dynamics may become less favorable. Strengthening the intensity of positive guidance from official media further enhances its ability to shape and influence public opinion in coal mining communities. This research provides a novel perspective and methodology for studying community safety management, offering significant theoretical and practical implications.
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Wang, Jiachen, Weijie Wei e Jinwang Zhang. "Theoretical description of drawing body shape in an inclined seam with longwall top coal caving mining". International Journal of Coal Science & Technology 7, n. 1 (11 dicembre 2019): 182–95. http://dx.doi.org/10.1007/s40789-019-00286-z.
Testo completoAbstract (sommario):
AbstractUnderstanding the characteristics of drawing body shape is essential for optimization of drawing parameters in longwall top coal caving mining. In this study, both physical experiments and theoretical analysis are employed to investigate these characteristics and derive a theoretical equation for the drawing body shape along the working face in an inclined seam. By analyzing the initial positions of drawn marked particles, the characteristics of the drawing body shape for different seam dip angles are obtained. It is shown that the drawing body of the top coal exhibits a shape-difference and volume-symmetry characteristic, on taking a vertical line through the center of support opening as the axis of symmetry, the shapes of the drawing body on the two sides of this axis are clearly different, but their volumes are equal. By establishing theoretical models of the drawing body in the initial drawing stage and the normal drawing stage, a theoretical equation for the drawing body in an inclined seam is proposed, which can accurately describe the characteristics of the drawing body shape. The shape characteristics and volume symmetry of the drawing body are further analyzed by comparing the results of theoretical calculations and numerical simulations. It is shown that one side of the drawing body is divided into two parts by an inflection point, with the lower part being a variation development area. This variation development area increases gradually with increasing seam dip angle, resulting in an asymmetry of the drawing body shape. However, the volume symmetry coefficient fluctuates around 1 for all values of the seam dip angle variation, and the volumes of the drawing body on the two sides are more or less equal as the variation development volume is more or less equal to the cut volume. Both theoretical calculations and numerical simulations confirm that the drawing body of the top coal exhibits the shape-difference and volume-symmetry characteristic.
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Rahimdel, Mohammad Javad. "SELECTION OF THE MOST PROPER UNDERGROUND MINING METHOD FOR KODAKAN GOLD MINE IN IRAN". Rudarsko-geološko-naftni zbornik 38, n. 4 (2023): 135–45. http://dx.doi.org/10.17794/rgn.2023.4.11.
Testo completoAbstract (sommario):
The selection of mining methods is a challenging and complicated concept in mining engineering. It depends on various and different factors such as geotechnical, geological and economic properties and characteristics. Kodakan Gold Mine in Iran is currently mined using the open pit method. However, due to the special conditions of this mine and the increase in waste removal costs, it is inevitable to decide to select an underground mining method in the future. The purpose of this research is to select the most proper underground mining method for this mine. The shape, dip, and depth of the deposit, the thickness of the ore, grade distribution, recovery, skilled manpower, output per worker, and strength specifications of the ore, hanging-wall, and footwall are considered as the main decision attributes. Since there are different parameters in selecting the appropriate mining method using the multi-attribute decision making approach, therefore hybrid multi-attribute decision-making method was employed in this paper to enhance the strength of the decision model and eliminate the weaknesses of the classical methods. Regarding the results of this study, rock quality designation of the hanging-wall and deposit shape have the highest weight value in selecting the underground mining method. Moreover, the shrinkage mining method is proposed as the most appropriate method.
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Tereshchuk, Roman, e Oleksii Hryhoriev. "Analytical Studies Concerning the Shape of Metallic Frame Flexible Support". Advanced Engineering Forum 25 (novembre 2017): 171–78. http://dx.doi.org/10.4028/www.scientific.net/aef.25.171.
Testo completoAbstract (sommario):
Determination of rational values of curvature radii of roof beam and stands to solve the problem of selecting rational shape of metallic frame flexible support under various mining and geological conditions of coal mines. The necessity to solve the problem of the determination of rational shape of metallic flexible support has been substantiated. Methodology to solve the problem of improving metallic frame support with the help of analytic equations of structural mechanics is represented. Shapes of mine working cross-sections as well as metallic support depending upon coefficient of lateral spreading obtained as the calculation results have been obtained. Further tendencies in research to improve mine working support have been determined.
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Hickson, P. W., D. W. McMahon e M. A. Schapper. "The Shape of Hard Rock Mining in the 21st Century". IFAC Proceedings Volumes 18, n. 6 (luglio 1985): 13–19. http://dx.doi.org/10.1016/s1474-6670(17)60481-6.
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Fuchs, Erich, Thiemo Gruber, Helmuth Pree e Bernhard Sick. "Temporal data mining using shape space representations of time series". Neurocomputing 74, n. 1-3 (dicembre 2010): 379–93. http://dx.doi.org/10.1016/j.neucom.2010.03.022.
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Larsen, Håkon. "Deep-Sea Mining: the Shape-Shifting Imaginaries at the New Extractivist Frontier". Public Anthropologist 6, n. 2 (11 dicembre 2024): 315–41. https://doi.org/10.1163/25891715-bja10061.
Testo completoAbstract (sommario):
Abstract Narratives of extraction are, in essence, speculations about imagined futures. This article addresses the emerging global phenomenon of deep-sea mining by examining how industry actors engage in rituals of negation to construct, negotiate, and reproduce scenarios of autonomous mineral extraction to curtail concerns over environmental risk. Being hailed as a redeeming frontier of capitalist growth in a post-carbon world, the deep ocean is prefigured as a site for sustainable exploitation by ultimately being fabricated as a lifeless, and socio-ecological void. First, the article considers the discursive elements underlying virtual scenarios of deep-sea mining, ethnographically exploring how shape-shifting imaginaries of technology unfold within corporate conferences in Norway. Second, and drawing connections to the Pacific, the article discusses how “gentle mineral extractions” are not only asserted as a technical endeavor of accumulation, but as claims of emancipation by proponents arguing deep-sea mining may lead to broader social labor justice.
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Zhang, Long, Jianhua Hu, Xinzhong Wang, Xiuwei Chai e Lei Zhao. "Collaborative Mining Sequence Optimization for Multiple Stopes under Intensive Mining". Advances in Civil Engineering 2021 (1 aprile 2021): 1–8. http://dx.doi.org/10.1155/2021/6683157.
Testo completoAbstract (sommario):
The optimization of a mining sequence not only reduces stress concentration in surrounding rock but also prevents underground debris flows, significantly improving safety. Firstly, the 870–898 m level of the eastern mining area in the Tiaoshuihe phosphate mine was divided into 25 ore blocks, and six different mining sequences were designed for this area. Then, it was calculated that five ore blocks must be processed simultaneously to reach the annual production output. The distances between the five simultaneously mined ore blocks will inevitably affect the efficiency of the equipment for any scheme. So, a collaborative model considering both the area stability and production capacity was established by combining the distance between the centers of the five ore blocks as an index. Differences in stability, deformation, and plastic zone size between the schemes are compared. The calculation results show that a mining scheme with a convex stepped shape produces the best results. These results provide a general method for entropy-based mining sequence optimization and an optimal solution for the Tiaoshuihe phosphate mine.
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KURBATOVA, V. V., N. E. LOMAKINA, I. YU GARIFULINA e E. A. GLOTOVA. "ANALYSIS OF PARAMETERS OF UNDERGROUND MINING SYSTEMS OF THE KUPOL DEPOSIT AND THE ORDER OF MINING OF THE NE 3 35-3 BLOCK". Mine Surveying and Subsurface Use, n. 3 (2024): 12–17. http://dx.doi.org/10.56195/20793332_2023_3_12_17.
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The article presents the results of studies of mining-geological and mining-geometric parameters of the underground mining of the indigenous gold-silver deposit «Dome», located on the border of the Anadyr and Bilibinsky districts of the Chukotka Autonomous District, It is established that the preparation of the block for cleaning works is carried out by mining-preparatory and rifled mining workings, passed at the horizons of 35 m and 50 m, with the accepted cross-section rectangular-vaulted shape. It is determined that an objective assessment of the mining-geological and mining-geometric parameters of the object makes it possible to determine effective mining systems. The research results can be useful in analyzing the validity of decisions made on ore mining technology with the approximation of experience to similar objects.
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Kodama, Hiroyuki, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa e Hiroaki Hukasawa. "Proposal of Ball End-Milling Condition Decision Methodology Using Data-Mining from Tool Catalog Data". Key Engineering Materials 523-524 (novembre 2012): 386–91. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.386.
Testo completoAbstract (sommario):
Machining is often performed by a machining center using various cutting tools and conditions for different shapes and materials. Recent improvements in CAM system make it easier for even unskilled engineers to generate NC programs. In the NC program, the end-milling conditions are decided by engineers. However, engineers need to decide the order of the process, cutting tool selection, and the end-milling conditions on the basis of their expertise and background knowledge because the CAM system cannot automatically decide. Data-mining methods were used to support decisions about end-milling conditions. Our aim was to extract new knowledge by applying data-mining techniques to a tool catalog. We used both hierarchical and non-hierarchical clustering of catalog data and also used applied multiple regression analysis. We focused on the shape element of catalog data and we visually grouped ball end-mills from the viewpoint of tool shape, which here meant the ratio of dimensions, by using the k-means method. We also found an expression for calculating end-milling conditions, and we compared the calculated with the catalog values.
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Nosach, Oleksandr, Andriі Petrenko, Oleksandr Isaienkov e Oleksandr Kipko. "ASSESSMENT OF THE INFLUENCE OF MINING-GEOLOGY AND MINING-TECHNICAL FACTORS ON THE STABILITY OF MINING WORKS". JOURNAL of Donetsk mining institute 54, n. 1 (2024): 104–13. http://dx.doi.org/10.31474/1999-981x-2024-1-104-113.
Testo completoAbstract (sommario):
Purpose. Analysis of the impact of mining-geological and mining-technical factors on the stability of excavation site products. Methods. Analysis of studies of the state of the geotechnical system “massif-mining-protection structure” analytically, in laboratory and production conditions. Results. The analysis of the factors affecting the stability of the excavation workings showed that the mining factors associated with the parameters of the workings (width of the workings, shape of the cross-section of the workings, the scheme of erection of support anchors, type of permanent support of the workings) come to the fore: the speed of the face movement and the parameters of the workings protection. The effect of a high speed of face advancement on the mechanism of bearing pressure on the edge part of the massif can be compared to the rolling of a massive sea wave, wide at the foot but with a lower crest height. At a high speed of its movement, there is no pronounced area or “peak” of additional loads. Among the mining and geological factors, the tectonic structure of the deposit, the depth of development and, as a result, the stress state of the rock mass are of great importance. The physical and mechanical properties of rocks are of subordinate importance, with the influence of layering, fracturing and water cut being particularly noticeable. The relationship between the convergence of side rocks in the working faces and the speed of the face advancement is periodic. The minimum displacement values are observed when the number of coal mining cycles per day is a multiple of three. It can be assumed that this pattern is due to the influence of tidal fluctuations and coincides with even harmonics. Scientific novelty. Based on the analysis, it was found that when addressing the issue of increasing the stability of excavation workings, it is necessary, first of all, to pay attention to mining factors (width of the workings, shape of the cross-section of the workings, scheme of erection of support anchors,) the speed of advancement of the cleaning face, parameters of the protective elements of the workings at the face-strip junction, and link them to mining and geological conditions, especially the tectonic structure of the deposit and the depth of its development. Practical implication. When determining the parameters of the geomechanical system “massif-mining-protection structure”, it is necessary to take into account the parameters of the production, the speed of the cleaning pit, the protection parameters of the production with the cohesive tectonic structure of the deposit, the depth of development and the physical and mechanical properties of the rocks.
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Ignatov, P. A., S. A. Malyutin, A. A. Ivanov, A. S. Desyatkin e M. M. Lanchak. "Ring-shape and linear gold mining districts of zimbabwe: estimation of residual gold resources". Proceedings of higher educational establishments. Geology and Exploration, n. 6 (30 dicembre 2023): 14–25. http://dx.doi.org/10.32454/0016-7762-2023-65-6-14-25.
Testo completoAbstract (sommario):
Background. Despite the long history of exploitation and study of Zimbabwe’s geological potential, the ranks of gold ore formations at the level of regions and fields remain unclear. Assessment of the residual primary gold deposits in Zimbabwe appears an important research direction.Aim. Identification of ring-shaped and linear ore districts confined to greenstone belts corresponding in configuration within the gold province of the Zimbabwe craton.Materials and methods. The main method for analyzing gold ore deposits was ore formation analysis. To analyze the residual gold resources in the regions of Zimbabwe, the Zipf-Lotke-Bradford rule was applied according to the ratio of an outstanding rare event in the form of a large deposit, rather rare events in the form of medium-sized deposits, and fairly rare events in the form of small ore objects in a certain ore region.Results. A hypothesis is proposed for the formation of ring-shaped belts as ore-bearing volcano-tectonic structures of the central type. Within the gold province of the Zimbabwe craton, ore districts of ring-shaped and linear shape, confined to greenstone belts corresponding in configuration, are identified for the first time. It is shown that the localization of deposits in ore regions is due to a combination of the following criteria: ancient faults, arc fragments of greenstone belts, and the development of post-tectonic multiphase granitoid magmatism. A ranking of deposits was carried out in the ore districts of Darwin, Shamva, Midlands, Bulawayo, Gwanda, Busha Mwezi - Fort Victoria, Shashe - Ozi-Umatli, and Sinoia. Five gold mining areas corresponding to volcano-plutonic ring-shape structures and three linear areas were identified. Productivity is predicted to be highest in the Midlands, Bulawayo, and Shamva ring-shape regions. An assessment of the residual gold resources of each of the selected areas is given. The feasibility of detailing important forecast criteria — Late Archean linear and arc faults and post-tectonic granitoids — with the development of additional criteria for further metallogenic zoning and localization of promising areas is established.Conclusions. The presented data serve as the basis for assessing the prospects of industrially important primary gold deposits in Zimbabwe and carrying out their forecast in the identified gold mining areas.
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Wu, Peng, Ning Jun Ruan e Kai Xie. "Intelligent System of Brain Tumor Automation Diagnosis Based on Image Analysis and Mining". Applied Mechanics and Materials 325-326 (giugno 2013): 1619–22. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.1619.
Testo completoAbstract (sommario):
This paper covers brain tumor diagnosis system based on image analysis and mining and its application. The system use the algorithm of fuzzy region competition, extracts shape feature factors to classify tumor shape, maps shape classification extracted automatically and other medical image features to numbers and then feed to bayesian network to sort the brain tumor automatically.
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Liu, Feilong, e Miao Li. "Evaluation Method of Product Shape Features based on Multidimension Spatial Data Mining". Mathematical Problems in Engineering 2022 (19 settembre 2022): 1–11. http://dx.doi.org/10.1155/2022/1111683.
Testo completoAbstract (sommario):
Analysis of product shape design has attracted more and more attention of researchers because it can make products better meet perceptual needs. Based on the theory of spatial data mining, this study proposes an evaluation method of a product shape design scheme. The method proposed in this study not only obtains the shape design of the overall and local features of the product, which solves the problem of the insufficient utilization of spatial data by the analysis method. During the simulation process, the model obtains the product shape design and appeal from the online evaluation spatial data, which can integrate the product perceptual knowledge in the spatial data, which greatly reduces the manual operation steps and the required time for the degree of data utilization. The experimental results show that after the obtained data are filtered to extract the feature words, the weight of the feature words is calculated by the TF-IDF method, the number of neighbors is increased from 1 to 30, the interval is 5, and the vectorized representation of the spatial data is constructed. The similarity between the calculation sentences of the data mining method is 89.7%, which effectively improves the support function and design efficiency of spatial data mining for product design.
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Emad, M. Z., Y. Majeed e G. Rehman. "Rock splitting techniques for reducing undesirable cracks and fissures in rock salt blocks". Journal of the Southern African Institute of Mining and Metallurgy 122, n. 3 (31 marzo 2022): 1–8. http://dx.doi.org/10.17159/2411-9717/1780/2022.
Testo completoAbstract (sommario):
Massive deposits of rock salt are mined in the Salt Range area of Pakistan. The main export products of rock salt include salt lamps, blocks, and tiles, while local consumption includes the chemical industry and domestic use. The profitable production of salt for value addition depends on the quality, size, and shape of the block. Salt processing for value addition is easier when very few cracks are present in the blocks. The current salt mining practice involves drilling and blasting, which introduces undesired fractures in the material. This paper focuses on the extraction of rock salt blocks by applying conventional cuboid-shaped block mining methods used in quarries. The techniques include wedges and feathers, expansion chemicals, and blasting with low-yield explosives. Experimental work involved both laboratory-scale and in-situ field testing. Laboratory experiments assisted with the determination of splitting force, load-deformation curves, and other rock mechanics parameters. Regression analysis proposes a relationship for the estimation of radial strain from the load in the case of the wedges and feathers method. The splitting force obtained from the laboratory tests was used to confirm the accuracy of the already published empirical relationship. The results of the laboratory as well as in-situ tests showed that the wedges and feathers technique is the most suitable method for mining rock salt blocks of the desired size, shape, while minimizing cracking.
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Wu, Xiangzhao, Song Sang, Youwei Du, Fugang Liu e Jintao Zhang. "Vortex-Induced Vibration of Deep-Sea Mining Pipes: Analysis Using the Slicing Method". Applied Sciences 14, n. 24 (20 dicembre 2024): 11938. https://doi.org/10.3390/app142411938.
Testo completoAbstract (sommario):
Deep-sea mining pipes are different from traditional ocean risers articulated at both ends: they are free-suspended, weakly constrained at the bottom, and have an intermediate silo at the end, compared to which relatively little research has been carried out on vortex-induced vibration in mining pipes. In this study, a sophisticated quasi-3D numerical model with two degrees of freedom for the flow field domain and structural dynamics of a deep-sea mining pipe is developed through a novel slicing method. The investigation explores how the vortex-induced vibrations of the mining pipe behave in various scenarios, including uniform and oscillating flows, as well as changes in the mass of the relay bin. The findings indicate that the displacement of the deep-sea mining pipe increases continuously as it moves from top to bottom along its axial direction. The upper motion track appears chaotic, while the middle and lower tracks exhibit a stable “8” shape capture, with the tail capturing a “C” shape track. Furthermore, with an increase in flow velocity, both transverse vibration frequency and vibration modes of the mining pipe progressively rise. Under oscillating flow conditions, there exists a “delay effect” between vibration amplitude and velocity. Additionally, an increase in oscillation frequency leads to gradual sparsity in the vibration envelope of the mining pipe in transverse flow direction without affecting its overall vibration frequency. Under the same flow velocity and different bottom effects, the main control frequency of the deep-sea mining pipe is basically unchanged, but the vibration mode of the mining pipe is changed.
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Kaźmierczak, Urszula, Monika Bartlewska-Urban e Paweł Strzałkowski. "Slope Shape Optimization of Water Reservoirs Formed Due to the Reclamation of Post-Mining Excavations". Applied Sciences 12, n. 3 (7 febbraio 2022): 1690. http://dx.doi.org/10.3390/app12031690.
Testo completoAbstract (sommario):
Reclamation of post-mining areas is one of the most important duties of an entrepreneur involved in mining mineral resources with the use of surface techniques. There are various forms of reclamation activities that depend on the chosen reclamation direction and intended function of the reclaimed object as well as from the type of the mined mineral. When there is water present in the mining excavation, we are talking about the aquatic direction of reclamation. This particular type of post-mining area requires a particular shape—especially if its intended future function is recreational. This research addresses optimization-related analyses and calculations of slope inclination in water reservoirs formed in post-mining excavations of both clastic and clay rock raw materials. Considering the conditions of stability and load-bearing capacity of water reservoir slopes, their optimum slopes were determined using the FlexPDE v 6.0 program, based on a two-dimensional elastoplastic model from the Coulomb–Mohr criterion. The inclinations of 1:5 and 1:15 are proposed, respectively, for the above-waterline and below-waterline slopes that serve a beach function. Slopes that do not serve a beach function are proposed to have an inclination of 1:2. Obviously, the strength conditions in the soil medium as well as the comfort of users were key drivers when it comes to selection of the slope inclinations.
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Zhang, Chuan, Vivek Yadav e Liwen Cui. "Mining of Candidate Genes Associated with Leaf Shape Traits in Grapes". International Journal of Molecular Sciences 25, n. 22 (11 novembre 2024): 12101. http://dx.doi.org/10.3390/ijms252212101.
Testo completoAbstract (sommario):
As the most important organ for photosynthesis, leaves provide the main energy source for plant growth. Leaf traits affect light energy utilization and, thus, plant development and biomass. Given the high morphological variability of leaves between and within grape genotypes, phenotypic analysis is challenging. This study first evaluated leaf shape trait parameters using a specific leaf profile and area analyzer, along with genome-wide association study (GWAS) analyses, to identify additional candidate genes related to grape leaf shape traits. In the two-year analysis, 89 single-nucleotide polymorphisms (SNPs) were found to be significantly associated with leaf shape traits. These SNP loci were distributed on 18 chromosomes, of which chromosome 15 had the most relevant SNPs. We found that leaf shape-associated genes included mainly plant hormone-, ubiquitin ligase-, serine/threonine protein kinase-, transcription factor-, and cell wall metabolism-related genes. By analyzing the expression of these candidate genes on the chip, we found that they exhibited diverse expression levels in leaves at different developmental stages (young, mature, and senescent). This suggests that these genes could be considered candidates for grape leaf improvement.
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Guo, Lin, Wanli Zuo, Tao Peng e Lin Yue. "Text Matching and Categorization: Mining Implicit Semantic Knowledge from Tree-Shape Structures". Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/723469.
Testo completoAbstract (sommario):
The diversities of large-scale semistructured data make the extraction of implicit semantic information have enormous difficulties. This paper proposes an automatic and unsupervised method of text categorization, in which tree-shape structures are used to represent semantic knowledge and to explore implicit information by mining hidden structures without cumbersome lexical analysis. Mining implicit frequent structures in trees can discover both direct and indirect semantic relations, which largely enhances the accuracy of matching and classifying texts. The experimental results show that the proposed algorithm remarkably reduces the time and effort spent in training and classifying, which outperforms established competitors in correctness and effectiveness.
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Gao, Xu, Chenyi Liu, Hongkai Zhang, Kunlin Yang, Yingjie Hu e Xiaofei Guo. "The Change in the Shape Characteristics of the Plastic Zone in the Surrounding Rock of an Auxiliary Retracement Channel and a Reasonable Channel Spacing Determination Method". Applied Sciences 13, n. 18 (21 settembre 2023): 10543. http://dx.doi.org/10.3390/app131810543.
Testo completoAbstract (sommario):
In underground coal mines, the stability of the retracement channel in the surrounding rock is crucial for the safe and efficient retracement of the equipment and to guarantee the continuity of the retracement work. To reveal the deformation and damage mechanism of the surrounding rock of an auxiliary retracement channel (ARC) and the determination method for the reasonable spacing of two retracement channels during the end of the mining period, the deviatoric stress field in front of the working face and the change in the shape characteristics of the plastic zone in the ARC are investigated in this paper. The formation of ultimate stress equilibrium, high deviatoric stress, decreasing deviatoric stress, and low deviatoric stress environments in front of the working face during the end of mining occur successively, and the different deviatoric stress environments are the main reasons for the different shape characteristics of the plastic zone in the surrounding rock. The changes in the shape characteristics of the plastic zone correspond to the changes in the shape characteristics in the zone with deviatoric stress and exhibit the following order: full plastic deformation zone, butterfly-shaped zone, elliptical zone, and circular plastic zone. A reasonable spacing determination method for the two retracement channels is proposed: the ARC is arranged in the decreasing deviatoric stress environment, where the surrounding rock plastic zone shape is elliptical, and the ARC is relatively stable. Based on this research result, the spacing of the double retracement channels at the Lijiahao 22-116 working face was determined to be 25 m, which achieved a positive application effect and allowed the safe and efficient retracement of the working face equipment.
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Wang, Xiao Gang, Xin Zhan Li e Yue Li. "Application of Cluster Algorithm in Clothes Shape Classifying". Applied Mechanics and Materials 55-57 (maggio 2011): 1058–62. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.1058.
Testo completoAbstract (sommario):
Based on research about patterns of garment, patterns were made to achieve data and interval of the bust eases. On the basis of bust eases, a series of shape profiles in different eases of garment were designed and distinguishing experiment was done according to the theory of psychics, which profiles in different eases were distinguished. The shapes in different fit were classified into four clusters: tight fit, fit, little loose and loose. The results of experiment were analyzed by k-means cluster method and quantitative classification based on bust ease was achieved. It opens our mind to make garment research by data mining method. A new method for garment fit research and classification exploration of outline shape was brought forward, which it offers reference for garment industry and research for automatic computer distinguishing technology.
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SHRESTHA, NRIPENDRA L., YOUHEI KAWAGUCHI e TAKENAO OHKAWA. "SUMOMO: A PROTEIN SURFACE MOTIF MINING MODULE". International Journal of Computational Intelligence and Applications 04, n. 04 (dicembre 2004): 431–49. http://dx.doi.org/10.1142/s1469026804001392.
Testo completoAbstract (sommario):
Protein surface motifs, which can be defined as commonly appearing patterns of shape and physical properties in protein molecular surfaces, can be considered "possible active sites". We have developed a system for mining surface motifs: SUMOMO which consists of two phases: surface motif extraction and surface motif filtering. In the extraction phase, a given set of protein molecular surface data is divided into small surfaces called unit surfaces. After extracting several common unit surfaces as candidate motifs, they are repetitively merged into surface motifs. However, a large amount of surface motifs is extracted in this phase, making it difficult to distinguish whether the extracted motifs are significant to be considered active sites. Since active sites from proteins with a particular function have similar shape and physical properties, proteins can be classified based on similarity among local surfaces. Thus, in the filtering phase, local surfaces extracted from proteins of the same group are considered significant motifs, and the rest are filtered out. The proposed method was applied to discover surface motifs from 15 proteins belonging to four function groups. Motifs corresponding to all 4 known functional sites were recognised.
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Mueller, Klaus, e Eric Papenhausen. "Patterns of Philanthropy: Using Pattern Mining for Predictive Analysis in Advancement and Fundraising". Journal of Advancement Analytics 2, n. 1 (2022): 101–15. http://dx.doi.org/10.1353/jaa.2022.a933996.
Testo completoAbstract (sommario):
Abstract: To support their academic mission, universities and colleges have become increasingly dependent on raising capital via advancement channels. As these institutions compete for the attention and funds of donors, advanced data analysis is a key to success. We present a method and system that can identify specific groups of donors that share sets of demographic, academic, and other features. This information can then be used to shape specific fundraising efforts and evaluate their expected profitability. We demonstrate our system using an advancement dataset we obtained via collaboration with a public university.
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Kodama, Hiroyuki, Toshiki Hirogaki, Eiichi Aoyama e Keiji Ogawa. "Aid of End-Milling Condition Decision Using Data Mining from Tool Catalog Data for Rough Processing". Advanced Materials Research 325 (agosto 2011): 345–50. http://dx.doi.org/10.4028/www.scientific.net/amr.325.345.
Testo completoAbstract (sommario):
The uses of data mining methods to support workers decide on reasonable cutting conditions has been investigated in this work. The aim of our research is to find new knowledge by applying data mining techniques to a tool catalog. Hierarchical and non-hierarchical clustering of catalog data as well as multiple regression analysis was used. The K-means method was used and on the shape presented in the catalog data and grouped end mills from the viewpoint of the tool's shape, which here means the ratio of dimensions has been focused. The numbers of variables were decreased using hierarchical cluster analysis. In addition, an expression for calculating the better cutting conditions was found and the calculated values were compared with the catalog values. There were three cutting conditions: conditions recommended in the catalog, conditions derived by data mining, and proven cutting conditions for die machining (rough processing).
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Sexton, Renard. "Unpacking the Local Resource Curse: How Externalities and Governance Shape Social Conflict". Journal of Conflict Resolution 64, n. 4 (12 settembre 2019): 640–73. http://dx.doi.org/10.1177/0022002719873044.
Testo completoAbstract (sommario):
Natural resource extraction is economically important in many developing countries, but social conflict can threaten the viability of the sector. This article examines why polluting extractive industries sometimes generate social mobilization but often do not. First, I distinguish acute, highly visible environmental externalities from chronic, less observable pollution, showing that only the former generate social mobilization. Second, I explore how high-quality local governance can mitigate the local resource curse dynamic by both reducing pollution and improving compensation in mining-intensive areas. The analysis uses microlevel data on extractive commodities, water pollution, children’s and livestock health, local government quality, and mining-related social conflict in Peru to demonstrate the full causal pathway of the local resource curse.
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Dougherty, Michael L. "Boom times for technocrats? How environmental consulting companies shape mining governance". Extractive Industries and Society 6, n. 2 (aprile 2019): 443–53. http://dx.doi.org/10.1016/j.exis.2019.01.007.
Testo completo
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Viktorov, Sergey D., Vladimir M. Zakalinsky, Andrey A. Eremenko, Ivan E. Shipovskii e Rafael Ya Mingazov. "DEVELOPMENT OF THE MECHANISM OF ACTION OF DECONCENTRATED CHARGES OF VARIOUS SHAPES FOR VARIOUS MINING CONDITIONS". Interexpo GEO-Siberia 2, n. 3 (21 maggio 2021): 135–43. http://dx.doi.org/10.33764/2618-981x-2021-2-3-135-143.
Testo completoAbstract (sommario):
The modern requirements of the market economy and the increasing complexity of the field development conditions require new scientific and technical approaches in deep quarries and mines in the complex development of subsurface resources. As you know, the dominant mining paradigm in drilling and blasting is associated with the technique of drilling wells and boreholes of a circular shape (cavity) with the placement of explosives in it. However, in mining science and practice, the variety of mining conditions has long required the creation of methods for the destruction of rocks with an asymmetry in the distribution of explosion energy in space and its maximum concentration in certain directions. In this regard, we consider a conceptual direction based on a fundamentally new mechanism of action of the explosion of known groups of parallel-converged borehole charges, which effectively expand their use in various mining applications. The development of a new mechanism of action of the explosive process with the use of a computer program and numerical simulation of calculations made it possible to use the change in the shape and design of the charge as a means of increasing the share of the energy flow of the explosive explosion in a certain direction. The design of the deconcentrated charge is shown as a means of increasing the fraction of the energy flow of the explosive explosion in a given direction, which leads to a significant increase in the efficiency of the directed explosion and, in particular, minimizes its action in the opposite," legit", direction. Based on the results of the research, a method of blasting operations is proposed to neutralize the influence of anomalies in the state of the massif on mining operations by the explosive method. The method includes the appropriate tools, characterized by an unconventional design of the borehole charge and using a mechanism for influencing the anomalous states of the array with a combination of its explosive features.
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Cheng, Guo Qiang, e Yan Jin Song. "The Evolution Rules of Overlying Strata Porosity Influenced by Mining Activation". Advanced Materials Research 282-283 (luglio 2011): 21–25. http://dx.doi.org/10.4028/www.scientific.net/amr.282-283.21.
Testo completoAbstract (sommario):
Rock is a type of natural material containing microcracks. The evolution of mining-induced fracture field is one of the main problems of gas comprehensive control and rock mass seepage. The distribution of fissures and porosity in overlying strata under the mining influence were studied in this paper. The stratum subsidence was represented quantitatively using elastic thin plate theory and key strata theory. Based on the stratum subsidence, a program calculating porosity in overlying strata was developed based on VB. The results demonstrate that the porosity increase with face advances. The porosity becomes small with the decrease of strata depth, and the bigger separation is located in the strata below the key strata. The amount of the fissures in the middle part of overlying strata is more than that in two ends, and the porosity curves present symmetric arch shape in the initial stage. With face advances, the curves of porosity in the strata located the upper position change symmetric arch shape into saddle shape.
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Jia, Lin Gang. "Simulation Experiment Study of Surrounding Rock Deformation and Surface Movement during Paste Filling Mining". Advanced Materials Research 1073-1076 (dicembre 2014): 2135–44. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.2135.
Testo completoAbstract (sommario):
Based on the prototype of No. 2307 filling working face in Yuyang mine, using the method of similar simulation combined with numerical simulation, the geological mechanics model is established to simulate and analyze the mechanics evolution law and the deformation and movement process of the surrounding rock and the surface during the filling mining. Research shows that backfilling can effectively control surrounding rock failure and the surface deformation, and the roof doesn’t collapse, but the bed separated fissures appear, and the maximum stagnation lags the working face by 58.5m; in the mining, surrounding rock stress releases and roof stretches, and the stress concentration appears in the front and end of the goaf, which is 1.47~1.78 times larger than that before mining, and the periodic weighting of filling working face is not obvious; the subsidence value is 212.7 mm after excavation, with the factor 0.06, and the ground level deformation and slope deformation shape are similar to the curve shape of roof caving control method with small values. The results have important theoretical guiding significance for controlling surface movement deformation in actual filling mining.
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Vijay Bhaskhar Reddy PP COMP.SCI.0560, Y., Dr L.S.S Reddy e Dr S.S.N. Reddy. "An Efficient Density Based Clustering approach for High Dimensional Data". International Journal of Engineering & Technology 7, n. 2.32 (31 maggio 2018): 111. http://dx.doi.org/10.14419/ijet.v7i2.32.15381.
Testo completoAbstract (sommario):
Data extraction, data processing, pattern mining and clustering are the important features in data mining. The extraction of data and formation of interesting patterns from huge datasets can be used in prediction and decision making for further analysis. This improves, the need for efficient and effective analysis methods to make use of this data. Clustering is one important technique in data mining. In clustering a set of items are divided into several clusters where inter-cluster similarity is minimized and intra-cluster similarity is maximized. Clustering techniques are easy to identify of class in large databases. However, the application to large databases rises the following requirements for clustering techniques: minimal requirements of domain knowledge to determine the input specifications, invention of clusters with absolute shape & certainty of large databases.. The existing clustering techniques offer no solution to the combination of requirements. The proposed clustering technique DBSCAN using KNN relying on a density-based notion of clusters which is accomplished to discover clusters of arbitrary shape.
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Edelbro, C., J. Sjöberg, L. Malmgren e C. Dahnér-Lindqvist. "Prediction and follow-up of failure and fallouts in footwall drifts in the Kiirunavaara mine". Canadian Geotechnical Journal 49, n. 5 (maggio 2012): 546–59. http://dx.doi.org/10.1139/t2012-012.
Testo completoAbstract (sommario):
A likely result of changes in rock stresses due to progressing mining is an increased number of compressive stress–induced failures. This paper presents the results from numerical analysis and observations of stress-induced fallouts in footwall drifts in the Kiirunavaara underground mine. A brittle-plastic “cohesion-softening friction-hardening” (CSFH) material model was used for simulating brittle fallouts. To account for mining-induced stress changes, the local model stress boundary conditions were extracted from a global model. The rock mass properties were based on field observations in the footwall drifts as well as on results from laboratory testing. A multi-stage analysis was carried out to gradually change the stresses to simulate mining progress. A parametric study was conducted in which strength properties, location, and shape of the footwall drift were varied. Yielded elements and maximum shear strain were used as damage and fallout indicators. The modelling results were sensitive to the shape of the drift. The location of the predicted fallouts was in good agreement with the location of observed fallouts for the case in which the drift roof was simulated flatter than the theoretical cross section. The results indicate that the true shape of the drift is different from the planned one.
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Wu, Jie. "Evaluation Model of Product Shape Design Scheme Based on Fuzzy Genetic Algorithm Mining Spatial Association Rules". Mathematical Problems in Engineering 2022 (18 marzo 2022): 1–10. http://dx.doi.org/10.1155/2022/2888472.
Testo completoAbstract (sommario):
Put forward a kind of association rules mining method based on fuzzy genetic algorithm, this approach by building a mining model, the association rules and fuzzy genetic algorithm fuses in together, and then given to the fitness function of the mining space, and uses threshold to limit the fuzzy genetic algorithm will cross distribution and compile the fitness function, the improved method excavation stability is strong, the mining accuracy is high. The clustering analysis method of multidimensional fuzzy genetic algorithm mapping association network is studied, and the multidimensional module layout target is analyzed by using fuzzy hierarchical analysis technology and improved genetic algorithm combined with the clustering target of each angle, and the module division of each angle is realized. The main structure of the product is constructed with process model as the integration framework, style as the organization form, and feature list as the expression mechanism. The product characteristics based on fuzzy genetic algorithm are studied, the main structure configuration design process model mapping relation analysis, combined with the main structure of the joint model, together to achieve the fuzzy genetic algorithm (GA) variant design of fine-grained axiomatic mode, based on the associated network building and integration of new product design process, product structure of multidimensional optimization problem is solved.
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Yan, Yueguan, Ming Li, Jibo Liu, Weitao Yan, Jinman Zhang e Bang Zhou. "Ground Subsidence Evolution from 1000 m Deep Mining: A Case Study in Fengfeng Mining Area". Shock and Vibration 2021 (27 settembre 2021): 1–9. http://dx.doi.org/10.1155/2021/9942968.
Testo completoAbstract (sommario):
The mining of coal resources in eastern China has entered the stage of deep mining, and many mines have reached the depth of 1000 meters. Different from shallow and moderate depth mining, the temporal and spatial evolution regulation of surface movement and deformation under deep mining has its particularity. Combining with the geological and mining conditions of Fengfeng mining area, this paper systematically studies the characteristics of surface movement under the condition of shallow, moderate, and near kilometer mining depth. By means of field measurement, InSAR monitoring, we get the subsidence data under different mining depth and get the relevant subsidence parameters by inversion. Through comparative analysis, the special law of subsidence under the mining depth of 1000 meters is obtained. The results show that under the condition of nearly 1000 meters mining depth, the surface movement and deformation have the characteristics of large displacement angle, small displacement deformation value, and large main influence radius. The regulation of small proportion of active period of maximum subsidence point, gentle shape of surface movement basin, and low mining adequacy are obtained. The research results provide technical references for deep mining under buildings, railways, and water bodies and provide basis and reference for scientific mining and safe recovery of coal pillars in kilometer deep mine.
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Cherkasov, P. V., Ya V. Popinako e M. S. Nikitenko. "Analyzing the effect of illumination on machine vision detection of the laser grid shape". Mining Industry Journal (Gornay Promishlennost), n. 5S/2024 (6 dicembre 2024): 110–15. https://doi.org/10.30686/1609-9192-2024-5s-110-115.
Testo completoAbstract (sommario):
The main purpose of the study was to analyze the quality of laser grid shape detection in various ranges of illumination intensity for industrial application in conditions of underground and open-pit mining and on production sites. In particular, the dependences were established of the illumination level effect on the quality of the laser grid shape detection with the machine vision. Images were used as the study objects, while the subject was the machine vision algorithms and the values of the qualitative shape detection parameters. As a result, the authors have identified the conditions for the most effective shape detection of a laser grid projected onto the surface. In accordance with the developed methodology, the result of a series of laboratory tests was obtained with different light discreteness. In case of insufficient value of the parameter for a group of pixels, erosion and dilation operations were used, allowing to change the parameters of adjacent pixels to the values that would ensure the shape detection. The results are obtained in the form of qualitative dependence of the laser grid cells shape detection on illumination in laboratory conditions. The conclusion is made about the optimal illumination range, at which the quality of the laser grid shape detection is stable. The obtained results can be applied in various industries, including the mining industry, when measuring the objects volume with machine vision in combination with a laser grid.
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Aghili, Maryamossadat, e Ruogu Fang. "Mining Big Neuron Morphological Data". Computational Intelligence and Neuroscience 2018 (24 giugno 2018): 1–13. http://dx.doi.org/10.1155/2018/8234734.
Testo completoAbstract (sommario):
The advent of automatic tracing and reconstruction technology has led to a surge in the number of neurons 3D reconstruction data and consequently the neuromorphology research. However, the lack of machine-driven annotation schema to automatically detect the types of the neurons based on their morphology still hinders the development of this branch of science. Neuromorphology is important because of the interplay between the shape and functionality of neurons and the far-reaching impact on the diagnostics and therapeutics in neurological disorders. This survey paper provides a comprehensive research in the field of automatic neurons classification and presents the existing challenges, methods, tools, and future directions for automatic neuromorphology analytics. We summarize the major automatic techniques applicable in the field and propose a systematic data processing pipeline for automatic neuron classification, covering data capturing, preprocessing, analyzing, classification, and retrieval. Various techniques and algorithms in machine learning are illustrated and compared to the same dataset to facilitate ongoing research in the field.
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Bagazeev, Viktor, Niyaz Valiev, Konstantin Kokarev e Vasiliy Startsev. "Method of placer mining by directional well drilling". E3S Web of Conferences 56 (2018): 01022. http://dx.doi.org/10.1051/e3sconf/20185601022.
Testo completoAbstract (sommario):
The study aims at justifying the method for the development of placers by directed drilling of wells. A description is given of the opening of the site, the receding and oncoming scheme of the digging excavation, drilling and expansion of the wells, the main hydraulic unit with remote control. The physics-mechanical substantiation of technological parameters is given: hydro-jet erosion, the shape and size of the cleaning chambers, the adaptation of hydrotransport calculation methods. With jetting, the required flow rate and pressure of water to break rocks is based on the laws of soil mechanics. The parameters of the clearing space and the shape of the chambers are taken in accordance with the magnitude of the vault of natural equilibrium. As a determining factor in the calculation of gravity hydrotransport, the consistency of the pulp is adopted with observance of the condition necessary for the bearing capacity. To adapt the methodology for calculating the hydraulic lifting of pulp to the conditions of well development, the coefficient of dilution is taken as the main design parameter. Modeling of jetting jet in the laboratory conditions was carried out, dependences of decrease in axial pressure were obtained at removal of the face from the nozzle.
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Zhang, Bang’an, Yushun Yang e Dongming Zhang. "Study on Temporal and Spatial Characteristics of Overlying Strata in the Deep Coal Mining Process". Advances in Civil Engineering 2021 (6 ottobre 2021): 1–14. http://dx.doi.org/10.1155/2021/4914531.
Testo completoAbstract (sommario):
This study adopts the stress relief method to test the in situ stress in the field to obtain the in situ stress distribution characteristics of no. 2 + 3# coal seam. A three-dimensional model was established with the no. S3012 working face as the engineering background, and the measured in situ stress values were applied to the three-dimensional model, and the spatial-temporal evolution characteristics of coal and rock mass around the stope during coal seam mining were studied. The specific conclusions are as follows: the three-dimensional stress distribution map in front of, behind, and on both sides of the working face in the process of coal mining are obtained. As the working face goes on, the maximum value of the supporting stress formed in front of, behind, and on both sides of the working face shifts to the corner, presenting a “hump-like” distribution. The stress concentration coefficient of front, back, and both sides of stope increases linearly with the increase of the mining size. Under the same mining size, the stress concentration coefficient in front of stope is the smallest, and the stress concentration coefficient on both sides is the largest. The three-dimensional displacement field distribution nephogram of overlying strata in the process of coal mining is obtained. With the continuous advance of the working face, the roof strata of coal seam undergo the continuous dynamic subsidence process, and the roof subsidence increases continuously, showing the shape of “bowl” with sharp bottom. In the process of working face mining, the roof displacement of coal seam showed an “O” shape evolution characteristic. The three-dimensional distribution cloud map of the plastic zone of coal and rock mass in the process of the working face mining was obtained, and the failure volume of the plastic zone gradually increases with the continuous progress of the working face.