Articles de revues : « Test mining »

1

Yu, Guangming, Xiankun Zeng, Xianzhang Ling, Chuanbo Hao et Kun Wang. « Study and Test on Development Regularity of Mining Speed of Coal Seam Separated from Overburden Strata ». International Journal of Geology and Earth Sciences 6, n^o 2 (juin 2020) : 15–19. http://dx.doi.org/10.18178/ijges.6.2.15-19.

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In the sedimentary coal stratum, rock stratum exhibits layered feature and has an obvious level. Overlying rock often produces separation along the level after the underground coal mining. But, due to the difference in the layers of rocks, the change of the mining process, the difference height in the level and other factors, the rule of separation is extremely complex. Therefore, in this paper, the allometric phenomenon, feature and laws of mining overburden separated strata are found by means of experiment and numerical simulation. The paper reveals the mechanical mechanism of allometric development of overburden separated strata, establishes its development formula based on the theory of beam in the mechanics, analyzing the space-time law of mining subsidence and overburden separation, and finally finds the relationship between surface subsidence and allometric growth of mining overburden separated strata, establishing the subsidence model based on allometric growth of mining overburden separated strata.

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Saifan, Ahmad A., Emad Alsukhni, Hanadi Alawneh et Ayat AL Sbaih. « Test Case Reduction Using Data Mining Technique ». International Journal of Software Innovation 4, n^o 4 (octobre 2016) : 56–70. http://dx.doi.org/10.4018/ijsi.2016100104.

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Software testing is a process of ratifying the functionality of software. It is a crucial area which consumes a great deal of time and cost. The time spent on testing is mainly concerned with testing large numbers of unreliable test cases. The authors' goal is to reduce the numbers and offer more reliable test cases, which can be achieved using certain selection techniques to choose a subset of existing test cases. The main goal of test case selection is to identify a subset of the test cases that are capable of satisfying the requirements as well as exposing most of the existing faults. The state of practice among test case selection heuristics is cyclomatic complexity and code coverage. The authors used clustering algorithm which is a data mining approach to reduce the number of test cases. Their approach was able to obtain 93 unique effective test cases out a total of 504.

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Dallmeier, Valentin, Nikolai Knopp, Christoph Mallon, Gordon Fraser, Sebastian Hack et Andreas Zeller. « Automatically Generating Test Cases for Specification Mining ». IEEE Transactions on Software Engineering 38, n^o 2 (mars 2012) : 243–57. http://dx.doi.org/10.1109/tse.2011.105.

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Bołoz, Łukasz, et Witold Biały. « Methods and Test Benches for Cutting Tools Testing—A Review ». Energies 16, n^o 1 (30 décembre 2022) : 445. http://dx.doi.org/10.3390/en16010445.

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Mechanical mining is a widely used method of separating materials from the face to obtain a useful mineral (e.g., coal, metal ores, salts, and diamonds), to make underground workings (e.g., mine galleries, tunnels, and underground garages), level roads, shape slopes, or to dig ditches. Mechanical mining is applied in the mining branch, tunnelling, road, and construction industries. Depending on the mechanical properties of the rocks, most frequently described by uniaxial compression strength, various machines and tools are used. The methods of mining high-strength abrasive rocks that have been used and developed in recent years are particularly applicable to the mining of copper, gold, tungsten, platinum ores, diamond deposits, and tunnelling. In addition to rock strength, the effectiveness of the mining process is affected by abrasiveness, which influences the rate of abrasive tool wear. Therefore, in various research and development centres, but also in production companies, tools are tested on unique stands. Tests are carried out to determine the cutting resistance and assess the wear rate. This article reviews methods and benches for testing mining tools, conical picks, and discs. Various solutions for testing single tools and cutting heads have been presented. The analysis conducted has revealed that despite the large number and great diversity of different test benches, there are no appropriate methods and stands for testing the wear rate of materials intended for mining tools.

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Poulin, Robert, Jerusha Bennett, Antoine Filion, Upendra Raj Bhattarai, Xuhong Chai, Daniela de Angeli Dutra, Erica Donlon et al. « iParasitology : Mining the Internet to Test Parasitological Hypotheses ». Trends in Parasitology 37, n^o 4 (avril 2021) : 267–72. http://dx.doi.org/10.1016/j.pt.2021.01.003.

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A. Saifan, Ahmad. « Test Case Reduction Using Data Mining Classifier Techniques ». Journal of Software 11, n^o 7 (juillet 2016) : 656–63. http://dx.doi.org/10.17706/jsw.11.7.656-663.

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Liao, Manqian, Jeffrey Patton, Ray Yan et Hong Jiao. « Mining Process Data to Detect Aberrant Test Takers ». Measurement : Interdisciplinary Research and Perspectives 19, n^o 2 (3 avril 2021) : 93–105. http://dx.doi.org/10.1080/15366367.2020.1827203.

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Dransfield, Mark, Asbjorn Christensen, Peter Diorio, Marion Rose et Peter Stone. « FALCON test results from the Bathurst Mining camp ». ASEG Extended Abstracts 2001, n^o 1 (décembre 2001) : 1–4. http://dx.doi.org/10.1071/aseg2001ab032.

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Dransfield, Mark, Asbjorn Christensen, Marion Rose, Peter Stone et Peter Diorio. « Falcon Test Results from the Bathurst Mining Camp ». Exploration Geophysics 32, n^o 3-4 (septembre 2001) : 243–46. http://dx.doi.org/10.1071/eg01243.

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Zhang, Mingzhe, Yunzhan Gong, Yawen Wang et Dahai Jin. « Mining constant information for readable test data generation ». International Journal of Embedded Systems 14, n^o 1 (2021) : 9. http://dx.doi.org/10.1504/ijes.2021.112002.

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Williams, Ian, et Susan Moran. « Test program set data collection and data mining ». IEEE Instrumentation & ; Measurement Magazine 13, n^o 4 (août 2010) : 34–40. http://dx.doi.org/10.1109/mim.2010.5521865.

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Chu, Na, et Wanzhi Ma. « Distribution of Large-Scale English Test Scores Based on Data Mining ». Complexity 2021 (24 mars 2021) : 1–10. http://dx.doi.org/10.1155/2021/5531595.

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Data mining technology is an effective knowledge mining and data relationship induction technology based on massive data, which is widely used in data analysis in many fields. In order to improve the utilization effect of students’ performance and meet the teaching needs of modern education, data mining technology can be applied to the existing performance database to mine the data information and treatment. Data mining technology is used to analyse and process the data stored in the student achievement management system, which provides the basis for improving the teaching quality and optimizing the teaching resources. Based on the analysis of the relevant data of large-scale English test results, this paper finds out the relevant rules that affect college English test results, forms the corresponding performance prediction rules, uses data mining technology to more comprehensively analyse the factors that affect students’ performance, establishes a model, and uses data mining tools to mine and analyse students’ English test data. It is of great practical significance to select the model with high accuracy, further optimize the parameters, make good use of the data, and then take targeted measures to guide the teaching reform, help students make more efficient learning plans, and improve and perfect the existing problems in teaching.

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He, Jiang, Lin-Ming Dou, Wu Cai, Zhen-Lei Li et Yan-Lu Ding. « In Situ Test Study of Characteristics of Coal Mining Dynamic Load ». Shock and Vibration 2015 (2015) : 1–8. http://dx.doi.org/10.1155/2015/121053.

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Combination of coal mining dynamic load and high static stress can easily induce such dynamic disasters as rock burst, coal and gas outburst, roof fall, and water inrush. In order to obtain the characteristic parameters of mining dynamic load and dynamic mechanism of coal and rock, the stress wave theory is applied to derive the relation of mining dynamic load strain rate and stress wave parameters. The in situ test was applied to study the stress wave propagation law of coal mine dynamic load by using the SOS microseismic monitoring system. An evaluation method for mining dynamic load strain rate was proposed, and the statistical evaluation was carried out for the range of strain rate. The research results show that the loading strain rate of mining dynamic load is in direct proportion to the seismic frequency of coal-rock mass and particle peak vibration velocity and is in inverse proportion to wave velocity. The high-frequency component damps faster than the low-frequency component in the shockwave propagating process; and the peak particle vibration velocity has a power functional relationship with the transmitting distance. The loading strain rate of mining dynamic load is generally less than class 10−1/s.

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SINAGA, MARKUSDIAN, et ACHMAD ZAINI. « PERBANDINGAN PENDAPATAN USAHATANI PADI SAWAH (Oryza sativa L.) DI DALAM DAN DI LUAR AREAL TAMBANG (Studi Kasus Areal Tambang PT. Multi Harapan Utama di Desa Jonggon Jaya Kecamatan Loa Kulu) (The Income Comparison of Wetland Paddy Farming (Oryza sativa L.) in Inside and Outside of Mining Area (Case Study Mining Area of PT. Multi Harapan Utama in Jonggong Jaya Village Loa Kulu Subdistrict)) ». JURNAL AGRIBISNIS DAN KOMUNIKASI PERTANIAN (Journal of Agribusiness and Agricultural Communication) 3, n^o 1 (20 avril 2020) : 57. http://dx.doi.org/10.35941/jakp.3.1.2020.3531.57-62.

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The purposes of this research were to determine the income of wetland paddy farming in inside and outside of mining area and to compare both of them. This research was conducted from August to October 2018 in minning area of PT. Multi Harapan Utama, Jonggon Jaya Village, Loa Kulu Subdistrict. Data collection was done through direct interview toward 33 respondents. Data was analyzed to count income and to do t test. The result of this research showed that the average income of wetland paddy farming in inside mining area was IDR12,049,299.99 ha-1ps-1 while the average income of wetland paddy farming in outside mining area was IDR10,663,654.70 ha-1ps-1. Income of wetland paddy farming in inside mining area was bigger than that in outside mining area based on tcount > ttable (3.637 > 2.039).

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Li, Pengyu, Zhenqi Hu, Yaokun Fu, Gensheng Li, Jiaxin Guo et Dongzhu Yuan. « Normality Test for Influence Function of Mining Surface Subsidence Based on Network Observation Station ». Mathematical Problems in Engineering 2022 (5 septembre 2022) : 1–12. http://dx.doi.org/10.1155/2022/2201996.

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Coal is the primary energy source in China, while underground mining is the mainstream way of coal mining. By triggering surface movement and deformation, underground mining can cause damage to arable land, buildings, roads, and so on, which is detrimental to the ecological environment in the mining area. In order to assess the severity of damage caused by this to the ground buildings and ecological environment in the mining area, it is necessary to predict mining-induced surface subsidence before the mining activities are carried out. Currently, the most used prediction method is the Probability Integral Method. It is based on probabilistic theory to mathematically demonstrate that the surface downwelling caused by underground extraction conforms to normal distribution. However, there is a lack of validation with measured subsidence basin data. Since the 1960s, China has been paying increased attention to the study of mining subsidence. However, there are still few network stations built across China to monitor subsidence basin. Herein, SPSS software is applied to re-analyze these valuable historical data. By analyzing the observation results and comparing them with the calculation results as obtained by using the probability integral method, it can be found out that the surface subsidence in the center of the subsidence basin conforms to normal distribution, not the subsidence at the edge of the subsidence basin. Therefore, it is inevitable for errors to occur at the edge of the subsidence basin when the normal distribution function is used as the mining influence function to calculate the surface subsidence. This conclusion is expected to provide practical reference for the prediction of surface subsidence in coal mines, and this experience can be extended to the mining of other solid minerals.

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Peng, Gao-You, Ming-Zhong Gao, Jing Xie, Qiang Liu, Guang-Di Deng, Cong Li et Zhi-Qiang He. « Field test research on gas migration law of mining coal and rock ». Thermal Science 23, n^o 3 Part A (2019) : 1591–97. http://dx.doi.org/10.2298/tsci180720228p.

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The fractures in coal and rock mass are the main channels of gas seepage, and understanding the gas migration law during mining is the precondition of gas control. The long-term in-situ monitoring of the abutment pressure, fracture networks and gas-flow in front of a mining face was carried out and the 1-D connectivity ratio of boreholes were calculated. The results showed that under the influence of mining, the fracture networks developed to the depth of rock stratum, and as far-field gas seepage channels, far-field gas continuously supplied the near-field gas. The gas flow in front of the mining face have undergone two stages of evolution from initial value to peak value, and then to a stable value. The 1-D connectivity ratio the abutment pressure about 5 to 10 m. The 1-D connectivity ratio reflected the dergree of coal and rock fracture penetration caused by mining, and the area with the highest gas extraction efficiency was the transition zone from peak abutment pressure to residual pressure in coal seams.

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Chu, Chengcheng. « Similarity Model Test of Coal Mining under Ordovician Limestone Nappe Aquifer ». Geofluids 2022 (17 mars 2022) : 1–12. http://dx.doi.org/10.1155/2022/9142345.

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Ordovician limestone in North China coalfield has the characteristics of karst fissure development and strong water yield. Coal mines in North China have been threatened by Ordovician limestone water for a long time. Taking the mining of 32 coal seam in the first eastern mining area of Qianyingzi coal mine in Anhui Province in China as the engineering geological prototype, this paper uses the self-developed fluid solid coupling similarity model test device to carry out the similarity model test of overburden stress and pore water pressure response of coal mining under Ordovician limestone nappe aquifer. Based on the variation law of pore water pressure and overburden stress in a stope, it can be seen that the variation law of pore water pressure in confined aquifer is jointly affected by two factors: the vertical distance between the monitoring point and coal seam and the horizontal distance between the monitoring point and DF200 fault. According to the analysis of experimental results, the maximum height of a water flowing fracture zone in the stope is fifteen times the mining thickness. Compared with the theoretical calculation results of empirical formula, the coupling effect of seepage field and stress field and the geological structure characteristics of the stope promote the development of a water flowing fracture zone. The research results of this paper have important theoretical and practical significance not only for the safe mining of Qianyingzi coal mine but also for the safe mining of the coal mine facing the double threat of roof Ordovician limestone confined aquifer and reverse fault.

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Liu, Zhixiang, Xiaoqing Dai, Shan Yang et Yuxi Liu. « Experimental Platform Development of Similar Simulation and Mechanical Test for Undersea Metal Mining ». E3S Web of Conferences 206 (2020) : 03032. http://dx.doi.org/10.1051/e3sconf/202020603032.

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With the depletion of shallow metal resources in the land, the development of seabed resources has become a new direction. In order to achieve safe and efficient exploitation of seabed metal mineral resources, a similar simulation test platform was established for seabed mining of metal minerals in this paper. Similar simulation materials and the best material ratios were selected to make simulated specimens. A series of mechanical pressurization devices and model sample were prototyped and submarine simulation mining test was conducted. During the simulation mining test, stress and strain changes and microscopic observations of crack evolution were monitored by the static strain test system. These indicators revealed the characteristics of ore-rock mechanical change in the development of submarine mental resources. By exploring the best safe thickness of seabed resource mining, it provides effective data reference for subsequent seabed resource development, so as to realize safe and efficient mining.

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Iswandari, Anisa, et Nazaruddin Malik. « PENGARUH HARGA MINYAK DUNIA DAN SUKU BUNGA BI TERHADAP HARGA SAHAM PERTAMBANGAN JANUARI PERIODE 2006-JULI 2008 ». Jurnal Ekonomi Pembangunan 7, n^o 1 (5 octobre 2016) : 9. http://dx.doi.org/10.22219/jep.v7i1.3579.

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The purpose of this research has done to knowing crude oil price dan BI rate to stock price on mining. The hypothesis are guess that crude oil price influence to stock mining and BI rate influence to stock mining. Analysis instrument to knowing influence of crude oil price and BI rate is use multiple linier regression analysis. To know what is the reach of independent variable influence to dependent variable use a hypothesis testing with a partial test (t test), simultant test (f test) and to knowing how the independent variable representative to dependent variable use a godness of fit (R2). The results of hypothesis analysis shows that crude oil price and BI rate have a significant influence to stock mining. Proof from the results shows that F test 259,5605 > F table 3,32. Partial test shows that crude oil price positive influence to mining which t test > t table (9,446>2,045) and BI rate not influence to mining which t test < t table (-12,008<2,045) with level a significant 5%.

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Man, Kaiwen, Jeffrey R. Harring et Sandip Sinharay. « Use of Data Mining Methods to Detect Test Fraud ». Journal of Educational Measurement 56, n^o 2 (juin 2019) : 251–79. http://dx.doi.org/10.1111/jedm.12208.

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Li, Zhenjun, et Xiaomo Yu. « Data mining technology for mechanical engineering computer test system ». Mechanical Systems and Signal Processing 141 (juillet 2020) : 106628. http://dx.doi.org/10.1016/j.ymssp.2020.106628.

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Rubio-Escudero, Cristina, Justo Valverde-Fernández, Isabel Nepomuceno-Chamorro, Beatriz Pontes-Balanza, Yoedusvany Hernández-Mendoza et Alfonso Rodríguez-Herrera. « Data Mining Techniques Applied to Hydrogen Lactose Breath Test ». PLOS ONE 12, n^o 1 (26 janvier 2017) : e0170385. http://dx.doi.org/10.1371/journal.pone.0170385.

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Fong, Joseph, Shi Ming Huang et Hsiang Yuan Hsueh. « Online analytical mining association rules using Chi-square test ». International Journal of Business Intelligence and Data Mining 2, n^o 3 (2007) : 311. http://dx.doi.org/10.1504/ijbidm.2007.015487.

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Ghafari, Mohammad, Konstantin Rubinov et Mohammad Mehdi Pourhashem K. « Mining unit test cases to synthesize API usage examples ». Journal of Software : Evolution and Process 29, n^o 12 (20 janvier 2017) : e1841. http://dx.doi.org/10.1002/smr.1841.

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Ma, Zimin, Jiong Wang, Manchao He, Yubing Gao, Jinzhu Hu et Qiong Wang. « Key Technologies and Application Test of an Innovative Noncoal Pillar Mining Approach : A Case Study ». Energies 11, n^o 10 (22 octobre 2018) : 2853. http://dx.doi.org/10.3390/en11102853.

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The waste of coal resources, a complicated production process and slow mining speed seriously restrict the rapid development of longwall mining. To achieve effective mining, an innovative noncoal pillar mining approach (i.e., Gob-side Entry Retaining by Roof Cutting (GERRC)) was introduced. The mechanism of the GERRC approach and its three key technologies (i.e., roof support technology, directional presplit cumulative blasting technology and surrounding rock control technology) were studied by theoretical analysis, numerical simulation, laboratory and field experiments. The new approach was finally tested under medium-thick coal seam and compound roof conditions. The results show that the directional presplit cumulative blasting technology can effectively control the damage evolution in the roof rock, maintain the integrity of the entry roof and contribute the gob roof to the cave in time. The support technologies in different roof movement stages can control the entry surroundings, and the final section of the retained entry met the safety production requirements. The test results suggested that the proposed approach for coal effective mining is feasible, and the introduced key technologies and design methods potentially produce reasonable values for applications of pillarless mining in similar projects.

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Stawowiak, Michał, et Marcel Żołnierz. « Mobile Test Stand Validation for Measuring Friction Coefficient of Carrying Rope with Friction Lining ». Management Systems in Production Engineering 26, n^o 3 (1 septembre 2018) : 143–50. http://dx.doi.org/10.1515/mspe-2018-0023.

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Abstract The article presents the problem of friction between the rope and the friction liner of a mining hoist very important for the safety of human transport. The friction linings approved for use in the Polish mining industry and their basic mechanical properties are presented. Laboratory and operational methods of friction feedback are described. This article presents an innovative mobile research stand developed at the Department of Mining Mechanization and Robotisation. The mobile test stand validation was presented.

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Zhang, Chengye, Huiyu Zheng, Jun Li, Tingting Qin, Junting Guo et Menghao Du. « A Method for Identifying the Spatial Range of Mining Disturbance Based on Contribution Quantification and Significance Test ». International Journal of Environmental Research and Public Health 19, n^o 9 (24 avril 2022) : 5176. http://dx.doi.org/10.3390/ijerph19095176.

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Identifying the spatial range of mining disturbance on vegetation is of significant importance for the plan of environmental rehabilitation in mining areas. This paper proposes a method to identify the spatial range of mining disturbance (SRMD). First, a non-linear and quantitative relationship between driving factors and fractional vegetation cover (FVC) was constructed by geographically weighted artificial neural network (GWANN). The driving factors include precipitation, temperature, topography, urban activities, and mining activities. Second, the contribution of mining activities (Wmine) to FVC was quantified using the differential method. Third, the virtual contribution of mining activities (V-Wmine) to FVC during the period without mining activity was calculated, which was taken as the noise in the contribution of mining activities. Finally, the SRMD in 2020 was identified by the significance test based on the Wmine and noise. The results show that: (1) the mean RMSE and MRE for the 11 years of the GWANN in the whole study area are 0.0526 and 0.1029, which illustrates the successful construction of the relationship between driving factors and FVC; (2) the noise in the contribution of mining activities obeys normal distribution, and the critical value is 0.085 for the significance test; (3) most of the SRMD are inside the 3 km buffer with an average disturbance distance of 2.25 km for the whole SRMD, and significant directional heterogeneity is possessed by the SRMD. In conclusion, the usability of the proposed method for identifying SRMD has been demonstrated, with the advantages of elimination of coupling impact, spatial continuity, and threshold stability. This study can serve as an early environmental warning by identifying SRMD and also provide scientific data for developing plans of environmental rehabilitation in mining areas.

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Yang, Zi Xian, Xiao Dong Ji, Hai Jiang, Yu Long Hu et Miao Wu. « Test and Research on Vibration Characteristics of EBH300(A) Roadheader ». Applied Mechanics and Materials 487 (janvier 2014) : 352–56. http://dx.doi.org/10.4028/www.scientific.net/amm.487.352.

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Cantilever excavator is widely used in fully mechanized mining face at present domestic coal mine, Its high efficiency, reliable working state is the promise of mine production and safety production. In this paper, using the mining vibration recorder for EBH300(A) roadheader vibration signal acquisition, and using MATLAB to analyze in the time domain analysis. Its useful to understand the vibration characteristics of roadheader work, and of important realistic significance for the tunneling machine structure optimization design and researching on fault diagnosis.

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Lauwers, Peter D. « Mining Claim Disputes in Ontario ». Revue générale de droit 17, n^o 4 (26 avril 2019) : 723–51. http://dx.doi.org/10.7202/1059228ar.

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1. General. Mining claim disputes in Ontario usually arise where a restaker attempts to dispute the validity of a claim under the provisions of the Mining Act. 2. Staking and Recording Requirements. Most mining claim disputes turn on whether there has been substantial compliance with the statutory staking requirements. A number of rules of thumb have evolved to assist the Mining Commissioner in making his decision as to whether there has been substantial compliance. These include the purpose test, the cumulative errors test, the reasonable excuse test, the equitable approach, the application of different staking standards and different circumstances, and classification of the seriousness of errors. The text also contains a discussion of the statutory staking and recording requirements. 3. Procedural Requirements in Disputes and Appeals. Staking disputes are ordinarily heard at first instance by the Mining Recorder, and then by the Mining Commissioner on appeal. The decisions of the Mining Commissioner may be appealed to the Divisional Court, a branch of the Supreme Court of Ontario. Specific emphasis is placed on the strictness of the time limits under the statute.

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Zeng, Xiao Tao, Ning Wang, Cong Jiang, Yun Yi Zhang et Gang Chen. « The Three-Dimensional Similar Simulation of Stress Regular Pattern of Roof of Large Mining Height ». Advanced Materials Research 945-949 (juin 2014) : 1190–95. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.1190.

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Based on the distribution of in-situ stress and the special conditions of the large mining height in one mining area, the author conducted the analogy stimulation test of the mine pressure behavior and the roadway deformation law. This research, mainly based on the geographical conditions of 1 to 2 coal seam of this mining area, stimulated the mine pressure behavior of the working face and the roadways, as the mining height is 5meters and 6meters. Through this analogy stimulation test, the mine pressure behavior of working face, in the mining process with large mining height, is analyzed and summarized.

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Anggono, Alexander, Farhan Syahriza et Firda Ivana Amelia. « ANALISIS PERBANDINGAN KINERJA KEUANGAN PERUSAHAAN SEKTOR PERTAMBANGAN DI INDONESIA DAN MALAYSIA ». Jurnal Kajian Akuntansi dan Auditing 17, n^o 2 (29 octobre 2022) : 77–87. http://dx.doi.org/10.37301/jkaa.v17i2.86.

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This study is intended to compare the financial performance of mining companies in Indonesia and Malaysia from 2014-2019. In particular, to analyze financial performance of mining companies in both countries by applying liquidity ratios, profitability ratios, activity ratios, and market ratios. The comparison is conducted as many investors interested to invest in mining sectors, and both countries are having the similar potential and market characteristics. The number of samples employed in this study is 23 mining sector companies in Indonesia and 11 mining sector companies in Malaysia. The data is analyzed using the multiple regression equations (F-test and T-test) and the two-sample difference test (U Mann Whitney test). The findings of this research are: (1) the debt to equity (DER) significantly affects the financial performance of mining sector companies in Indonesia; (2) The variables current ratio (CR) and price to earnings ratio (PER) have a significant influence on the financial performance of mining sector companies in Malaysia; (3) The variables current ratio (X1), debt to equity ratio (X2), Total assets turnover (X3), price to earnings ratio (X4), and return on equity (X5) have an effect on the financial performance of mining sector companies in Indonesia and in Malaysia; and (4) there is no significant difference in financial performance between mining companies in Indonesia and Malaysia. The implication of this study is to assist investors to opt the best investment opportunity in mining sector in Indonesia and Malaysia stock market.

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Dai, Fen Lei, Hai Rong Pang et Wen Qiang Xie. « Development of Automatic Test System of Rig Comprehensive Performance ». Advanced Materials Research 664 (février 2013) : 1082–86. http://dx.doi.org/10.4028/www.scientific.net/amr.664.1082.

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The rig is widely used in coal mining production, its research and development, manufacture and use are required to test the performance indicators. For this, the paper researches and developments the comprehensive performance automatic test system in coal mining rig by using virtual instrument technology, and detailedly discussed the hardware configuration and software design scheme of the test system. After a hundred sets of various types testing and inspection of rig, the operation results shows that the automatic test system can meet the various performance parameters’ testing requirements of the split and crawler rigs, and greatly simplify performance testing program of rig, improve the test efficiency.

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Dobryakova, N. N., O. S. Golynets, A. A. Lavrinenko, E. P. Vishnevskaya et S. A. Epshtein. « Standard test method for mercury content evaluation in solid mineral fuels ». Limnology and Freshwater Biology, n^o 3 (2022) : 1374–75. http://dx.doi.org/10.31951/2658-3518-2022-a-3-1374.

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Abstract. In addition to carbon, oxygen, hydrogen and nitrogen, fossil fuels contain other chemical elements, some of which may be hazardous to human health and the environment. Mercury and its compounds are one of the most dangerous among them. Therefore, information about mercury contents in coals and products of their processing is extremely important for both mining and processing enterprises and consumers. Mercury compounds may be accumulated in coal mining and processing wastes, and if they transfer into water-soluble forms, may lead to damaging of the environment. In the view of above, a standard method for the determination of mercury content has been developed, which is applicable not only to coals and products of their processing, but also to coal mining and combustion wastes. Also, to control the correctness of measurements by the developed method, reference samples with a certified mercury contents were developed.

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Wiska, Mayroza. « Menakar Struktur Kepemilikan Saham dan Kinerja Perusahaan ». Jurnal Manajemen Bisnis 17, n^o 3 (31 juillet 2020) : 457. http://dx.doi.org/10.38043/jmb.v17i3.2498.

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ABSTRACTAnalysis of Performance Shareholding Structure of the Company (a mining company listed on the Indonesia Stock Exchange. In preparation of this paper, the authors have conducted research on the Indonesia Stock Exchange (Capital Market Information Center-Padang) Jl.Pondok 90 Padang. The purpose of this study was to determine the effect of ownership structure on corporate performance in the mining company listed on the Indonesia Stock Exchange (BEI. The analysis in this research using descriptive statistics, classic assumption test (test mulitikolonieritas, autokolerasi test, normality test), analysis of regression coefficient test, partial regression coefficients (t test), testing regression coefficients together (test f). As for the overall analysis of this data with the help of a software program SPSS version 21.0 for Windows. Results of this study concluded that: (1) public ownership structure positively affects the performance of companies in the mining company listed on the Indonesia Stock Exchange (BEI). (2) The structure of stock ownership is not a positive influence on the company's performance in the mining company listed on the Indonesia Stock Exchange (BEI). (3) The structure of public ownership and foreign ownership together affect the company's performance in the mining company listed on the Indonesia Stock Exchange (BEI).

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Duan, Bao Fu, Meng Zhang, Lei Li, Hong Chun Li et Hui Wu. « Technology of Safe and Efficient Submarine Deposit Mining ». Applied Mechanics and Materials 90-93 (septembre 2011) : 1960–64. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.1960.

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Submarine mining is unprecedented in China. XinLi Mining area, affiliated to Sanshandao Gold mine, is the first metal mining carrying out submarine mining exploitation in domestic. No occurrence of uniform settlement, cracking and collapse is the key point during the mining exploitation. According to the mining choosing principle and combining the production practice and relevant experience of Sanshandao Gold mine, the representative schemes are put forward. Two representative test stopes of 63# and 71# are chosen. After the comprehensive comparison and analysis, high-drift back-filling method is adopted to research the safety of submarine mining. Industrial test results show that the high-drift back-filling method has the significant advantages of safety mining, low ore dilution and so on. The mining production ability is improved greatly, obtaining remarkable effect and realizing the key points of higher efficiency and lower loss rate of ores.

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Liu, Peng Liang. « Cemented Filling Mining Technology in Continuous Miner Filling Mining Face ». Advanced Materials Research 1010-1012 (août 2014) : 1511–17. http://dx.doi.org/10.4028/www.scientific.net/amr.1010-1012.1511.

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Based on interval arrangement characteristics of the mined branch roadways and pillars in continuous miner filling mining gob,the cemented filling mining thought which divided mining and filling both into two stages was put forward.The first stage was mining branch roadways and then filling gob with cemented materials in time, and the second stage was mining pillars and filling gob with the first stage filling body support when it meet designed strength. Industrial field test showed that branch roadways were smoothly mined and filled, filling body strength meet demand and pillars were safety mined out.Continuous miner filling mining technology could reache high production efficiency based on advantages of mining and filling parallel operation and filling spaces constructing easily.

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Suradi, Jessica Prania, et Selly Eriska Marisa. « ANALISIS DAMPAK HARGA MINYAK MENTAH DUNIA, TINGKAT SUKU BUNGA DAN KURS VALUTA ASING TERHADAP INDEKS HARGA SAHAM PERTAMBANGAN PERIODE 2014 – 2016 ». Jurnal Bina Manajemen 8, n^o 2 (31 mars 2020) : 1–17. http://dx.doi.org/10.52859/jbm.v8i2.84.

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This study aims to look at the effect of world crude oil prices, interest rates, and foreign exchange rates on the mining sector stock price index for the 2014-2016 period. The research method used is descriptive statistical methods with quantitative research types. This study also uses analytical methods such as multiple regression analysis through t test and F test. Based on the F test (simultaneous) shows that world oil prices, interest rates, and foreign exchange rates affect simultaneously on the mining sector stock price index for the period 2014-2016 , while the t test (partial) shows that world crude oil prices a positive but not significant effect on the mining stock price index for the period 2014-2016, the interest rate has a negative effect and significant to the mining sector stock price index for the period 2014-2016, and the foreign exchange rate has a negative and significant effect on the price index mining sector shares in the 2014-2016 period.

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Ma, Xingyin, Zhiyong Fu, Yurong Li, Pengfei Zhang, Yongqiang Zhao et Guoping Ma. « Study on Surface Subsidence Characteristics Based on Three-Dimensional Test Device for Simulating Rock Strata and Surface Movement ». Energies 15, n^o 5 (7 mars 2022) : 1927. http://dx.doi.org/10.3390/en15051927.

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The main functions of a three-dimensional test device for simulating rock formations and surface movement affected by underground coal mining were described in detail, and a series of similar related tests were carried out. The device consisted of an outer frame, a pressurization unit, a pulling unit, and a coal seam simulation portion. Using this test device, supported by monitoring methods such as the three-dimensional laser scanner method, a model test study on the surface subsidence characteristics caused by coal seam mining was carried out. Combined with the field measurements, the transfer law of surface subsidence caused by coal seam mining was revealed, and the whole surface subsidence response process was analyzed. The experimental results show that the subsidence caused by mining disturbances below the coal seam accounts for 79.3% of the total subsidence, which is the dominant factor of the total surface subsidence. After long-term surface observations, surface subsidence can be divided into four stages after coal mining, and the settlement value of the obvious settlement stage accounts for more than 60% of the total settlement value. The above test results fully reflect the feasibility and practicality of the three-dimensional test device to simulate rock strata and surface movement and provide a new experimental research tool that can be used to further study the surface subsidence characteristics and control caused by coal mining.

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Sun, Xiu Juan. « Preprocessing of Examination Analysis System Data Based on Data Mining ». Applied Mechanics and Materials 608-609 (octobre 2014) : 300–303. http://dx.doi.org/10.4028/www.scientific.net/amm.608-609.300.

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The development of science and technology has driven the progress of the examination system, through the development of database and intelligent, data mining, the database technology is also developed. But at present there are insufficient data mining scope, so must strengthen the examination analysis system has the function of data preprocessing, data mining to meet the needs of data mining algorithm, and accelerate the execution efficiency of data mining, to prevent the deviation, as a result more than the entire process of data mining and data pretreatment cost and time needed to about forty percent less. So, in order to analyze the test system in a large number of test data, in this way is very necessary to carry on the pretreatment before the data into the database is the important factor of data mining.

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Sahoo, Minati. « Community Forest and Rural Household Dependency in Mining Region ». International Journal of Social Ecology and Sustainable Development 12, n^o 4 (octobre 2021) : 15–27. http://dx.doi.org/10.4018/ijsesd.2021100102.

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The present paper attempts to analyse the households' dependency on community forest for their livelihood and food security in the mining region of Odisha. Mining has caused the highest forest-land loss in Odisha. Using z-test, f-test, and t-test, it has been found that extraction of minerals has not only caused shifting of livelihood from forest-based to mining related work but also has significantly reduced the dependence of households on forest products for consumption. In addition, it has reduced the contribution of forest to food security as calorie intake from forest food is significantly less in mining households than their non-mining counterparts. As the life span of a mine is finite, what will happen when the mines close? Thus, this calls for a policy intervention to carry out mining operations in a sustainable manner so that natural resources like forest are not sacrificed for short-term economic gains.

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Chen, Kai, Hong Tan, Jie Gao et Da Xia Wang. « Application of Association Rule Mining on Food Safety Test Data ». Applied Mechanics and Materials 556-562 (mai 2014) : 4681–84. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.4681.

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For the purpose of improving scientific regulatory and effectively making use of supervision information for food safety, we have collected more than 200,000 testing data in the information system from 2009 to 2013. In this paper, with association rule, several analytical models, as exemplified by soy data, was created according to the feature of soy. Valuable information can be obtained from massive testing data, which is conducive to food safety supervisions.

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Hsu, Hui Huang. « Mining test results to personalise and refine web-based courses ». International Journal of Applied Systemic Studies 3, n^o 2 (2010) : 183. http://dx.doi.org/10.1504/ijass.2010.034108.

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Gao, Jun, Shan Li et Qian Xu. « Communication Distance Test of Pulse MWD System for Mining Mud ». IOP Conference Series : Earth and Environmental Science 508 (1 juillet 2020) : 012164. http://dx.doi.org/10.1088/1755-1315/508/1/012164.

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Harris, Preethi, et Nedunchezhian Raju. « Towards test suite reduction using maximal frequent data mining concept ». International Journal of Computer Applications in Technology 52, n^o 1 (2015) : 48. http://dx.doi.org/10.1504/ijcat.2015.071419.

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Radev, Slavian. « Test, Teachers, Quorum (Pure Populations) ». Serdica Journal of Computing 7, n^o 3 (23 avril 2014) : 215–26. http://dx.doi.org/10.55630/sjc.2013.7.215-226.

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The “trial and error” method is fundamental for Master Minddecision algorithms. On the basis of Master Mind games and strategies weconsider some data mining methods for tests using students as teachers.Voting, twins, opposite, simulate and observer methods are investigated.For a pure data base these combinatorial algorithms are faster then manyAI and Master Mind methods. The complexities of these algorithms arecompared with basic combinatorial methods in AI.ACM Computing Classification System (1998): F.3.2, G.2.1, H.2.1, H.2.8, I.2.6.

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Xingen, Ma, He Manchao, Hu Bing, Wang Dalong, Chen Cunqiang, Li Jing, Gao Jianxun, Jiang Qi et Bai Zongrong. « Study on Key Parameter Design and Adaptability Technology of the 110 Mining Method for the Yuwang NO.1 Coal Mine in the Diandong Mining Area ». Minerals 13, n^o 2 (26 janvier 2023) : 176. http://dx.doi.org/10.3390/min13020176.

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The 110 mining method is a high-efficiency entry-retaining technology without coal pillars or filling materials. At present, there is no precedent for its application in the Huaneng Group. In order to introduce this technology, it is planned to carry out experimental application research in the Yuwang NO.1 Coal Mine of the Huaneng Diandong mining area. The Yuwang NO.1 Coal Mine is a typical coal and gas outburst mine with a coal seam group. In view of the introduction of the 110 mining method under these conditions, first, the geological conditions of the Yuwang NO.1 Coal Mine in the Huaneng Diandong mining area are analyzed, the geological characteristics of the test mining face are summarized, and the practical feasibility of the 110 mining method is analyzed according to the geological characteristics of “one soft, one low, two high, and two complex”. Then, according to the engineering experience, calculations, and analysis, the key parameters of roof cutting of the test mining face in the Yuwang NO.1 Coal Mine are obtained, and with the help of a numerical simulation, the roof-cutting height, the roof-cutting angle, and the blasting parameters are numerically simulated and analyzed. The roof-cutting key parameters of the test face are obtained as follows: the roof-cutting depth is 7 m, the roof-cutting angle is 15°, and the blasting method is continuous hole blasting with 500 mm spacing. After that, according to the coal and gas outburst and the occurrence conditions of coal seams in the Yuwang NO.1 Coal Mine, a variety of gob closure design schemes and gob gas drainage design schemes are put forward, and the field effect investigation scheme is given. After the tunnels and open-off cut of the test coal mine’s first mining face are connected, under the guidance of the above research results, the field blasting test and the 110 mining method entry-retaining test are further carried out to verify the rationality of the design of the roof-cutting parameters and the feasibility of the gangue wall closure and gas drainage design. Furthermore, in the process of the field practice, continuous research is carried out on the stope pressure law and the adjacent layer gas drainage technology under the 110 mining method, and finally, the 110 mining method application technology system in the Diandong Mining Area is formed.

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Zhang, Meng, Hui He, Yu Zhang, Xin Jin, Xinyu Liang, Yidong Zhang et Hongjun Guo. « Research on the Deformation and Control Technology of Surrounding Rock in Entry Retaining along the Gob Side ». Advances in Civil Engineering 2020 (16 septembre 2020) : 1–18. http://dx.doi.org/10.1155/2020/8885439.

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This paper studies and introduces the successful case of gob-side entry retaining technology and the typical mining pressure law in Luan mining area, which is the main mining coal seam in Qinshui coalfield. Qinshui coalfield has an estimated coal reserve of 300 billion tons, accounting for 9.58% of the total national coal reserve in China, especially anthracite, chemical coal, and coking coal. The methods of field investigation, theoretical analysis, physical experiment, and industrial test are adopted. Through the field investigation, theoretical analysis, physical experiments, and industrial test, the following conclusions have been drawn in this study: (1) A thorough engineering geological investigation was conducted on the entry retaining along the gob side on noncoal pillar mining working face, which covers multiple periods of mining process including the roadway excavation period, primary mining period, primary mining stability period, and secondary mining influence period. A series of analysis and tests were conducted such as core sampling, rock mechanics property testing, borehole detection, and flexible formwork support evaluation, which laid a foundation for identifying the mining pressure law of gob-side entry retaining by using noncoal pillar mining. (2) The mining pressure law was studied through the collection of the field measurements taken from the entry retaining along the gob side on noncoal pillar mining working face. The keys to achieve the roadway surrounding rock stability through noncoal pillar mining are obtained. According to the study, the stability control of retained roadway surrounding rock mainly depends on the stability of top coal, coal side, and shoulder angle coal. (3) In this study, a roadway reinforcement scheme is proposed to improve the surrounding rock control technology for gob-side entry retaining by noncoal pillar mining, whose effectiveness has been verified by a series of industrial test. Therefore, the wide adoption of the noncoal pillar mining method in Number #3 coal mine can significantly relieve the predicament of coal pressing under a large number of buildings in Luan mining area, which provides insightful guidance to the coal-free pillar mining in the whole Luan mining area.

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Bokil, Prasad, Padmanabhan Krishnan et R. Venkatesh. « Achieving Effective Test Suites for Reactive Systems using Specification Mining and Test Suite Reduction Techniques ». ACM SIGSOFT Software Engineering Notes 40, n^o 1 (6 février 2015) : 1–8. http://dx.doi.org/10.1145/2693208.2693226.

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Subashini, B., et D. Jeya Mala. « An Effective Approach to Test Suite Reduction and Fault Detection Using Data Mining Techniques ». International Journal of Open Source Software and Processes 8, n^o 4 (octobre 2017) : 1–31. http://dx.doi.org/10.4018/ijossp.2017100101.

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Software testing is used to find bugs in the software to provide a quality product to the end users. Test suites are used to detect failures in software but it may be redundant and it takes a lot of time for the execution of software. In this article, an enormous number of test cases are created using combinatorial test design algorithms. Attribute reduction is an important preprocessing task in data mining. Attributes are selected by removing all weak and irrelevant attributes to reduce complexity in data mining. After preprocessing, it is not necessary to test the software with every combination of test cases, since the test cases are large and redundant, the healthier test cases are identified using a data mining techniques algorithm. This is healthier and the final test suite will identify the defects in the software, it will provide better coverage analysis and reduces execution time on the software.

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Hong, Shunjun, et Xiaozhou Hu. « Study on the Non-Steady-State Wear Characteristics and Test of the Flow Passage Components of Deep-Sea Mining Pumps ». Applied Sciences 12, n^o 2 (13 janvier 2022) : 782. http://dx.doi.org/10.3390/app12020782.

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In the process of conveying coarse-grained minerals, the internal flow-through passage components of mining pumps are subject to wear. The flow of coarse particles in such pumps is complex and changes constantly, making it necessary to study the non-steady-state wear characteristics and test the flow passage components. The evolution of the surface wear rate for the flow passage components during one third of a rotation cycle (120°) of a mining pump impeller with small, design, and large flow rates was analyzed in this study based on a discrete phase model (DPM). The flow that occurs during an entire rotation cycle of the impeller was investigated. The wear test was carried out with a small test pump with the same specific speed as and a similar structure to that of the deep-sea mining pump. The test results were compared with the numerical calculation results of the deep-sea mining pump obtained by using the same numerical calculation method and wear model, and the test wear area was found to be more consistent with the numerical calculation wear area. The results show that the numerical calculation method used in this article can more accurately predict the surface wear of the passage components of the mining pump and provides a suitable method for the prediction of the wear characteristics of the mining pump.

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