Theory And Experiment Of The Dual-Bit Torque Self-Balancing Drilling System For Rescue Drilling,
2022
College of Construction Engineering, Jilin University, Changchun 130061, China; Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun 130061, China
Theory And Experiment Of The Dual-Bit Torque Self-Balancing Drilling System For Rescue Drilling, Gao Ke, Zhang Cong, Zhao Yan, Li Xu, Wen Yumin, Lyu Xiaoshu, Xie Xiaobo
Coal Geology & Exploration
The rapid and safe construction of rescue channel is an effective method to save the trapped person underground after mine accidents. The conventional rescue hole drilling technologies mainly include the downhole hammer percussion drilling technology and the composite drilling technology, which have the disadvantages of large rig structure, complex drilling process, great disturbance to the formation and low target hit rate. In particular, it is easy to have secondary accidents in the fractured strata, and the rescue requirements could not be effectively met. In order to ensure the formation adaptability and wall stability of rescue boreholes, the dual-bit torque self-balancing …
Occurrence Characteristics And Ecological Risk Assessment Of Heavy Metals In Fly Ash Of Ningdong Energy Chemical Industry Base,
2022
School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China; Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, China; Anhui Engineering Laboratory for Comprehensive Utilization of Water and Soil Resources and Ecological Protection in Mining Area with High Groundwater Level, Huainan 232001, China
Occurrence Characteristics And Ecological Risk Assessment Of Heavy Metals In Fly Ash Of Ningdong Energy Chemical Industry Base, Zhang Zhiguo, Tan Yuning, Hu Youbiao, Zheng Yonghong, Chen Denghong, Cai Weiqing, Li Yating, Lu Jiangwei
Coal Geology & Exploration
In order to expand the resource utilization of fly ash, research was conducted based on the fly ash of Yuanyang Lake Power Plant in the Ningdong Energy Chemical Industry Base. Specifically, the physical and chemical properties of fly ash were characterized and analyzed by means of scanning electron microscope, energy spectrum analysis and X-ray diffraction. Besides, the total amount, effective state and content in different forms of Pb, Cr, Ni, Cu, Cd and As in fly ash were determined through acid digestion, DTPA extraction and 5-step Tessier sequential extraction. In addition, the ecological risk of heavy metals in fly ash …
Nexus Between Animal Welfare, Environment, And Sustainable Development: Resource Document,
2022
WellBeing International
Nexus Between Animal Welfare, Environment, And Sustainable Development: Resource Document, Wellbeing International
Nexus – UNEP – Animal Welfare, Environment, Sustainable Development
This Resource Document has been developed to explore the Nexus (links) between Animal Welfare, the Environment, and Sustainable Development. The document includes relevant citations and reports addressing the topics encompassed by the Nexus. It will be maintained as a “living document” (subject to revision) in the WellBeing International Studies Repository. The original document and subsequent revisions will be kept in the Repository to provide a record of the changes.
Quantitative Experimental Study On Time-Varying Characteristics Of Bleeding Of Cement-Based Grouting Materials,
2022
Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Beijing 101601, China
Quantitative Experimental Study On Time-Varying Characteristics Of Bleeding Of Cement-Based Grouting Materials, Zhang Runqi, Xu Bin, Yin Shangxian, Li Shuxia, Chang Yongwang, Lian Huiqing, Cao Min
Coal Geology & Exploration
Cement-based cementitious materials are the most common grouting materials for grouting engineering. This type of material has obvious water separation effect, and obtaining the quantitative formula of water separation thickness will be helpful to improve the calculation accuracy of slurry diffusion radius. By observing the water separation process of three admixtures, namely pyrophyllite powder (0%-35%), polyvinyl alcohol (0%-8%) and fly ash (0%-90%) in cement-based slurry, the water separating rate, stone formation rate, final water separation time and water separation thickness of the three admixtures were obtained. It is found that the water separation thickness of the slurry varies regularly with …
Heat Conduction Performance And Transfer Mechanism Of Sand-Barite Powder Backfill Materials,
2022
College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Heat Conduction Performance And Transfer Mechanism Of Sand-Barite Powder Backfill Materials, Jia Hailiang, Zhu Zixian, Zhou Yang, Sun Qiang
Coal Geology & Exploration
The ground source heat pump of buried pipeline is a major form of shallow thermal energy utilization, and the thermophysical properties of backfill materials, especially the thermal conductivity, are the key factors affecting the heat transfer efficiency of the heat pump system. In this paper, the variation law of thermal conductivity of the sand-barite powder samples at different barite powder mixing ratio (volume fraction) and saturation was studied. The mechanism of improving the thermal conductivity of backfill materials with barite powder was revealed based on the macroscopic and microscopic experiments such as stereoscope and nuclear magnetic resonance analysis. In addition, …
Tomography Method For Adjacent Channel Frequency Shift Of Transmitted In-Seam Waves,
2022
School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Tomography Method For Adjacent Channel Frequency Shift Of Transmitted In-Seam Waves, Tian Han, Wu Rongxin, Hu Ze’An, Yang Qiaonan
Coal Geology & Exploration
In-Seam Seismic is one of the main detection methods for small geological structures in the coal mining working face. In this method, the energy attenuation feature of in-seam waves is mainly utilized. In case of any significant geological anomaly or receivers coupling difference in coal working face, the energy distribution of the in-seam wave at different frequency bands will be significantly affected, and the stability and accuracy of in-seam wave detection results will be decreased. Using the centroid frequency change features of the in-seam wave signals for inversion imaging is an innovative, effective method. However, for this method, there are …
Development Of Rescue Truck-Mounted Drilling Rig In Ground Emergency,
2022
Xi’an Research Institute(Group) Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Development Of Rescue Truck-Mounted Drilling Rig In Ground Emergency, Fan Dong, Zou Zujie, Wang Ruize, Lu Feifei, Liu Qi, Wang Hejian
Coal Geology & Exploration
Ground drilling is an effective means to rescue the person trapped underground in case of accident in a mine. The rescue truck-mounted drilling rig is an ideal model for mine accident rescue due to its adaptability to a variety of drilling technologies and the advantages of wide formation adaptability, high mobility and strong accident handling capacity. In view of the shortcomings of domestic truck-mounted drilling rig in the construction of life support hole and large-diameter relief well, ZMK5550TZJF50/120 truck-mounted drilling rig was developed. Specifically, the large capacity power head adaptable to various technologies was developed, adopting the design of installation …
Adaptive Electro-Hydraulic System Of Zmk5550tzjf50/120 Truck-Mounted Drilling Rig With Wob Adaptive Control Function,
2022
Xi’an Research Institute (Group) Co.Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Adaptive Electro-Hydraulic System Of Zmk5550tzjf50/120 Truck-Mounted Drilling Rig With Wob Adaptive Control Function, Chang Jianghua, Zhao Liang, Lu Feifei, Wang Longpeng, Yang Jiangbo
Coal Geology & Exploration
The truck-mounted drilling rig is an ideal model for rescue drilling construction due to its strong mobility and wide process adaptability. The traditional truck-mounted drilling rig adopting the mode of hydraulic control and hydraulic drive has the problems of non-intuitive displaying of control parameters and many pipelines, which is hard to achieve the closed-loop control. In case of drilling into the complex formations, the response speed of the driller is often difficult to adapt to changes in working conditions, which is not conducive to the drilling safety. In order to meet the requirements of safety and high automation of rescue …
Table Of Contents,
2022
China Coal Technology and Engineering Group (CCTEG)
Application Of Pneumatic Dth Hammer In Drilling Rescue Of Mine Accidents,
2022
Xi’an Research Institute (Group) Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Application Of Pneumatic Dth Hammer In Drilling Rescue Of Mine Accidents, Zhao Jiangpeng, Hao Shijun
Coal Geology & Exploration
As an efficient percussive rock breaking tool, pneumatic down-the-hole (DTH) hammer has played an important role in drilling rescue of mine accidents at home and abroad. Herein, the technical characteristics of pneumatic DTH hammer were described from the points of rock breaking mechanism, structure type, drilling method and specification, and the reverse circulation type and its characteristics of pneumatic DTH hammer were emphatically analyzed. Besides, the application of forward circulation drilling of pneumatic DTH hammer and the combined deviation correction drilling of pneumatic DTH hammer and mud screw in small diameter drilling, as well as the research progress of pneumatic …
Formation Mechanism Of Coalbed Methane In Dafosi Mine Field, Huanglong Coalfield,
2022
Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi’an 710123, China
Formation Mechanism Of Coalbed Methane In Dafosi Mine Field, Huanglong Coalfield, Liu Kaide, Yao Kaiwen, Chen Nengyuan, Fan Zhangqun, Li Shujia, Zheng Han, Yue Wenping, Li Xiaolong
Coal Geology & Exploration
Dafosi mine field is a typical low-rank coalbed methane (CBM) field in Binchang mining area of Huanglong Jurassic. There are many coalbed methane wells in the field, but few researches are performed on the formation mechanism of coalbed methane. Thus, it is of great guiding significance to clarify the geochemical characteristics and formation mechanism of coalbed methane (CBM) in the mine field, which could provide important basis for the analysis on productivity difference of high- and low-yield CBM Wells. For this reason, the samples of drained gas at the wellhead of six CBM wells, 22 coal samples of No.4 coal …
Digital Twin Technology Of Geological Information In Mining And Excavation Working Face,
2022
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China;Xi’an Research Institute (Group) Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Digital Twin Technology Of Geological Information In Mining And Excavation Working Face, Li Peng, Cheng Jianyuan
Coal Geology & Exploration
The mine geology transparency is the basis for the intelligent coal mine construction. 3D geological modeling is an important measure for realizing the mine geology transparency. In the geological modeling of the previous working face, there are problems including the discrepancy between the interpolation algorithm and the geological law, the low fusion level of the multi-source heterogeneous geological data, and the seldom coupling between the coal mine production equipment and the geological information. The concept of the digital twin of the geological information about coal mine working face was proposed, the discrete smooth interpolation (DSI) algorithm was adopted, and the …
Impact Of Voids And Backfill On Seismic Wave Velocity-Preliminary Results,
2022
Nazarbayev University, School of Mining and Geosciences, Nur-Sultan, Kazakhstan
Impact Of Voids And Backfill On Seismic Wave Velocity-Preliminary Results, Zarina Mukhamedyarova, Fidelis Suorineni, Temirlan Aldubay, Gylym Sapinov
Journal of Sustainable Mining
In this study, laboratory experiments were conducted on discrete physical models that mimic mining effects to better understand the impact of continuous changes in mining environments on seismic wave velocities. The discrete physical models are represented by concrete and granite cubic samples of different sizes with holes of different diameters filled and unfilled with cemented sand backfill of different cement-sand content ratios. The hole diameters range from 0 to 150 mm in block sizes ranging from 150 mm to 450 mm in increments of 75 mm. The increasing hole size mimics increasing extraction in the mine with time. Cemented sand …
Predicting The Stability Of Open Stopes Using Machine Learning,
2022
University of Alberta, School of Mining and Petroleum Engineering, Edmonton, Alberta T6G 2R3, Canada.
Predicting The Stability Of Open Stopes Using Machine Learning, Alicja Szmigiel, Derek B. Apel
Journal of Sustainable Mining
The Mathews stability graph method was presented for the first time in 1980. This method was developed to assess the stability of open stopes in different underground conditions, and it has an impact on evaluating the safety of underground excavations. With the development of technology and growing experience in applying computer sciences in various research disciplines, mining engineering could significantly benefit by using Machine Learning. Applying those ML algorithms to predict the stability of open stopes in underground excavations is a new approach that could replace the original graph method and should be investigated. In this research, a Potvin database …
Climate Change Curricula In Alberta, Canada: An Intersectional Framing Analysis,
2022
University of Calgary
Climate Change Curricula In Alberta, Canada: An Intersectional Framing Analysis, Greg Lowan-Trudeau
Northwest Journal of Teacher Education
This article is comprised of a climate change-focused framing analysis of proposed revisions to Alberta, Canada’s K-6 curriculum as an ideologically motivated manifestation of curricular epistemicide. Eisner’s three curricula—the explicit, implicit, and null—and scholarship related to intersectional climate and environmental justice, education, and communication provide the theoretical framework. This inquiry concludes with a critical discussion of and possible alternatives to the revised curriculum with further consideration of the implications for those involved with similar endeavours in other jurisdictions across Canada and around the world.
Strengthening Ecosystem Management Is Helpful For Achieving The Carbon Neutrality Goal,
2022
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
University of Chinese Academy of Sciences, Beijing 100049, China
Strengthening Ecosystem Management Is Helpful For Achieving The Carbon Neutrality Goal, Bojie Fu, Nan Lv, Yihe Lv
Bulletin of Chinese Academy of Sciences (Chinese Version)
No abstract provided.
Coordinate The Five-Pool Functions Of Ecosystem And Build Strong National Ecological Infrastructures—Ecological Construction Ideology, Tasks And Goals In The New Developing Era Of China,
2022
Research Center of Chinese Ecosystem Research Network, CAS Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
Coordinate The Five-Pool Functions Of Ecosystem And Build Strong National Ecological Infrastructures—Ecological Construction Ideology, Tasks And Goals In The New Developing Era Of China, Guirui Yu, Meng Yang, Tianxiang Hao
Bulletin of Chinese Academy of Sciences (Chinese Version)
No abstract provided.
Enlightenment Of Biosphere Reserve To Establishment And Management Of National Park In China,
2022
Institute of Ecology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Enlightenment Of Biosphere Reserve To Establishment And Management Of National Park In China, Jinhong Du, Ning Liu, Yijie Xian, Ding Wang, Wei Wang
Bulletin of Chinese Academy of Sciences (Chinese Version)
China has officially established the first batch of national parks in 2021 and such construction is entering a high-speed stage. National parks of the country basically originate from existed protected areas, and face series of long-standing problems and challenges, such as over simplified administration, low community participation, and prominent contradictions between ecological conservation and social development. The Man and the Biosphere (MAB) Programme is the first flagship project of United Nations Educational, Scientific and Cultural Organization (UNESCO) for biodiversity and cultural diversity conservation, biosphere reserve is its implementation platform, which has accumulated a lot of useful experience in biodiversity conservation, …
Overview Of The Role Of The Party’S Scientific Authority In Implementation Of Convention On International Trade In Endangered Species Of Wild Fauna And Flora,
2022
Endangered Species Scientific Commission, P. R. China., Beijing 100101, China
Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
Overview Of The Role Of The Party’S Scientific Authority In Implementation Of Convention On International Trade In Endangered Species Of Wild Fauna And Flora, Jiang Zhu, Fuwen Wei
Bulletin of Chinese Academy of Sciences (Chinese Version)
Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) aims to ensure the survival of endangered wildlife species from the threat of international trade, and is one of the powerful international conventions in the field of wildlife conservation. As an important part of the party's compliance body, scientific authority (SA) is responsible for ensuring the international wildlife trade to meet the requirements of sustainability, legality and traceability. The mandate of SA is involved into many aspects, like starting up the scientific research program for obtaining the basic information on wildlife species, providing the scientific advice for …
Research On Ecological Protection Compensation Mechanism Based On Carbon Sink Value,
2022
Chinese Academy of Natural Resources Economics, Beijing 101149, China
Key Laboratory of Carrying Capacity Assessment for Resource and Environment, Ministry of Natural Resources, Beijing 101149, China
Research On Ecological Protection Compensation Mechanism Based On Carbon Sink Value, Lifei Jin, Haidong Zhou, Ruilin Liu
Bulletin of Chinese Academy of Sciences (Chinese Version)
The establishment of ecological protection compensation mechanism is a critical content and an important institutional guarantee for the construction of ecological civilization. Carbon peak and carbon neutrality have been included in the overall layout of the construction of ecological civilization. The optimization of ecological protection mechanism based on carbon sink value plays a pivotal role in promoting the construction of ecological civilization in China, which is an important means of regulating the fairness of "carbon neutrality" process, and will also promote the transformation of ecological protection compensation policy to refinement. Based on the connotation, attribute and realization path of carbon …
