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Articles 871 - 900 of 1009
Full-Text Articles in Sustainability
Design And Analysis Of Hole-Forming Technology For Surface Large Diameter Emergency Rescue Borehole, Hao Shijun, Mo Haitao
Design And Analysis Of Hole-Forming Technology For Surface Large Diameter Emergency Rescue Borehole, Hao Shijun, Mo Haitao
Coal Geology & Exploration
Surface large diameter borehole can be used as the escape channel for trapped people underground, and it is one of the important emergency rescue plans when mine accidents cause people trapped underground. However, the conventional large-diameter engineering hole is mainly formed by mud positive circulation and multi-stage reaming, which can not meet the rescue requirements. Focusing on the purpose of rescue and escape of large-diameter hole, this paper expounds the hole forming technology design principles including accurate connecting roadway, optimization of borehole structure, high-efficiency hole forming and safety connecting roadway. According to the specific construction conditions of overburden drilling, second …
Distribution And Occurrence Of Uranium In Coal And Its Migration Behavior During The Coal Utilization, Wang Wenfeng, Wang Wenlong, Liu Shuangshuang, Bai Hongyang, Wang Yulong, Duan Piaopiao, Qin Kemin, Chen Yilin
Distribution And Occurrence Of Uranium In Coal And Its Migration Behavior During The Coal Utilization, Wang Wenfeng, Wang Wenlong, Liu Shuangshuang, Bai Hongyang, Wang Yulong, Duan Piaopiao, Qin Kemin, Chen Yilin
Coal Geology & Exploration
Coal and uranium resources are closely related in spatial disposition as well as mineralization, and the reasonable development, utilization and pollution control of them play an essential role in the sustainable development of our national economy and society. Based on a large number of literature research and the previous results of our research group, some conclusions were drawn with regard to the distribution and occurrence of uranium in coal `and its migration in the process of coal preparation, combustion and leaching:(1) The enrichment and mineralization of uranium in coal has reflected the evolution of coal-forming tectonics:The U-rich coal in Southwest …
Evaluation Of The Hydro-Fracturing Potential For Coalbed Methane Reservoir: A Case Study Of Zhengzhuang Cbm Field, Yao Yanbin, Wang Hui, Yang Yanhui, Liu Dameng, Lu Xiuqin, Cao Lutong
Evaluation Of The Hydro-Fracturing Potential For Coalbed Methane Reservoir: A Case Study Of Zhengzhuang Cbm Field, Yao Yanbin, Wang Hui, Yang Yanhui, Liu Dameng, Lu Xiuqin, Cao Lutong
Coal Geology & Exploration
The "double low" rate of exploration and utilization of CBM resources in China leads to a significant slowdown in CBM production, which has become a bottleneck restricting the development of CBM industry in China. The common CBM reservoir evaluation method did not pay enough attention to the hydro-fracturing potential, resulting in low discovery rate of high-quality gas reserves and low mobilization-rate of the present reserves. Thus, it is extremely necessary to do some research regarding to hydro-fracturing potential evaluation. Targeting on the Zhengzhuang CBM field of the southern Qinshui Basin, this study did comprehensive investigations including coal core analysis, physical …
Comprehensive Testing Research On Floor Damage Characteristics Of Mining Extra-Thick Seam In Jungar Coalfield, Zhang Pingsong, Liu Chang, Ou Yuanchao, Sun Binyang, Xu Shi'ang, Li Shenglin
Comprehensive Testing Research On Floor Damage Characteristics Of Mining Extra-Thick Seam In Jungar Coalfield, Zhang Pingsong, Liu Chang, Ou Yuanchao, Sun Binyang, Xu Shi'ang, Li Shenglin
Coal Geology & Exploration
The 6th coal seam of the Carboniferous Permian in a coal mine in the Ordos Basin of Inner Mongolia is an extra-thick coal seam with an average minable thickness of 17.0 m. Its floor is threatened by limestone water. Distributed sensing optical fiber technology and cross-hole resistivity CT in situ comprehensive testing technology were used in the field, and the response characteristics of strain field and geoelectric field were obtained successively during mining. Combined with the threshold value of the discriminant parameter for loading deformation and failure of rock samples and detection section of practice, the monitoring data of the …
Experimental Study On The Influence Of Co2 Injection Pressure On Gas Diffusion Coefficient, Zhou Xihua, Han Mingxu, Bai Gang, Lan Anchang, Fu Zhihao
Experimental Study On The Influence Of Co2 Injection Pressure On Gas Diffusion Coefficient, Zhou Xihua, Han Mingxu, Bai Gang, Lan Anchang, Fu Zhihao
Coal Geology & Exploration
Most of the coal seams in China are characterized by low pressure, low permeability and low saturation. The methane gas in the coal seam is slowly desorbed and diffused slowly, which affects the production rate of coalbed methane. The coal samples from Zhaozhuang Coal Mine of Jinmei Group were selected to study the influence of different gas injection pressure on CH4 displacement process and the variation law of CH4 diffusion coefficient in the process of displacement. Independently developed CO2 displacement CH4 test platform was used to carry out the experiments under different gas injection pressures such …
Variation Law And Estimation Model Of Permeability Coefficient In Unconsolidated Confined Aquifer, Chen Luwang, Peng Zhihong, Wang Yingxin, Ge Rutao, Li Ruirui
Variation Law And Estimation Model Of Permeability Coefficient In Unconsolidated Confined Aquifer, Chen Luwang, Peng Zhihong, Wang Yingxin, Ge Rutao, Li Ruirui
Coal Geology & Exploration
The coal measure strata in the concealed coalfields in North China are generally covered by the Quaternary loose soils. Many hydrogeological hazards, such as mine water inrush, surface subsidence and wellbore deformation failure, have occurred in mining under unconsolidated confined aquifer, which has caused huge economic losses and casualties. The permeability coefficient is an important parameter that reflects the permeability of soil medium in the unconsolidated confined aquifer. A reasonable estimation of its values has important guiding significance for the prevention and control of such hydrogeological hazards. At present, the permeability coefficient of the unconsolidated confined aquifer in the concealed …
Characteristics And Distribution Laws Of Electric Potential Response To Mining Failure Of Deep Coal Seam, Wang Enyuan, Li Zhonghui, Niu Yue, Liu Shengdong, Shen Rongxi, Li Dexing, Zhang Xin
Characteristics And Distribution Laws Of Electric Potential Response To Mining Failure Of Deep Coal Seam, Wang Enyuan, Li Zhonghui, Niu Yue, Liu Shengdong, Shen Rongxi, Li Dexing, Zhang Xin
Coal Geology & Exploration
To study the response characteristics and laws on electric potential(EP) signal of the coal body in the mining failure process, a self-developed mine EP meter was utilized to conduct field tests in the No. 25050 fully mechanized mining face of Xuehu Coal Mine. The results show that the EP signals can be produced significantly during coal seam mining failure process, and the EP response characteristics can reveal the changes of stress state in coal body. As the working face advances, the EP intensity firstly increases and then decreases. The EP intensity decreases significantly after the construction of stress-relief drillings. Simultaneously, …
Research Progress Of Laser Drilling Technology In Coal Petrography, Wang Yudan, Luo Yaokun, Wen Guojun, Wu Lingling, Guan Donglin, Yao Zou
Research Progress Of Laser Drilling Technology In Coal Petrography, Wang Yudan, Luo Yaokun, Wen Guojun, Wu Lingling, Guan Donglin, Yao Zou
Coal Geology & Exploration
As an innovative technology with great potential in rock drilling, laser drilling has attracted great attention in research. Laser drilling is a non-contact drilling technology, which has little disturbance and damage to broken and soft formation. Thus, laser drilling can play a significant role in directional drilling of coalbed methane. This paper combs and summarizes the hole forming mechanism and influencing factors of drilling effect of laser drilling in coal petrograph. In the process of laser drilling, the interaction between laser and coal is accompanied by complex physical and chemical effects. It is pointed out that the main hole formation …
Validity Analysis Of Flow Field Method In Detecting Seepage Vector Distribution Of Earth-Rock Dam, Dai Qianwei, Cui Yongsheng, Han Xingjin, Lei Yi, Li Jiepeng, Zhu Zelong
Validity Analysis Of Flow Field Method In Detecting Seepage Vector Distribution Of Earth-Rock Dam, Dai Qianwei, Cui Yongsheng, Han Xingjin, Lei Yi, Li Jiepeng, Zhu Zelong
Coal Geology & Exploration
Based on the similarity between the electric potential differential control equations of the current field and velocity potential differential control equations of the seepage field, the flow field method(FFM) can not only determine the seepage by measuring the distribution of current field, but also can efficiently figure out the leakage location of the dam. For further discovering the vector distribution and direction of seepage more accurately, the horizontal and vertical potential difference between the upstream and the downstream can be measured to simulate the vector distribution of seepage. In this paper, we illustrate the principle of vector flow field method(VFFM) …
The Main Progress In The 13Th Five-Year Plan And The Prospect Of Coal Geology, Jia Jiancheng, Gong Zewen, Jin Dewu, Li Quanxin, Wu Yan
The Main Progress In The 13Th Five-Year Plan And The Prospect Of Coal Geology, Jia Jiancheng, Gong Zewen, Jin Dewu, Li Quanxin, Wu Yan
Coal Geology & Exploration
Based on the brief analysis the evolution of "coal geology", the main progress of discipline in basic theoretical research, geological guarantee technology, coal and rock detection during the 13th five-year Plan period is reviewed emphatically, meanwhile the main problems faced and the development direction in the 14th five-year plan period and even a longer period of time are pointed out. It is considered that coal geology should around the development goals of coal industry of "providing sufficient green coal" and "reducing geological disasters in coal mine", taking the key geological theories and technical bottlenecks in green coal exploration, precise intelligent …
Sequence-Paleogeography And Coal Accumulation Of Lopingian In Guizhou Province, Shao Longyi, Hua Fanghui, Yi Tongsheng, Guo Lijun, Wang Xuetian
Sequence-Paleogeography And Coal Accumulation Of Lopingian In Guizhou Province, Shao Longyi, Hua Fanghui, Yi Tongsheng, Guo Lijun, Wang Xuetian
Coal Geology & Exploration
Based on outcrop sections and borehole data, the sequence stratigraphy, paleogeography, and coal accumulation of Lopingian(Upper Permian) in Guizhou Province have been studied. According to distribution of marine limestone beds which reflects variation of the transgressions, we have subdivided the Lopingian into 3 third-order composite sequences(CSⅠ, CSⅡ, CSⅢ) and related lowstand, transgressive, highstand sequence sets. CSⅠcorresponds to the lower and middle parts of the Lower Member of Longtan Formation. CSⅡcorresponds to the upper part of the Lower Member of Longtan Formation. CSⅢcorresponds to upper part of the Upper Member of Longtan Formation and Changxing Formation. The paleogeography map of these …
Numerical Simulation Of Pore Structure Stress Characteristics Of Coal And Rock Mass, Wang Gang, Jiang Chenghao, Chen Xuechang
Numerical Simulation Of Pore Structure Stress Characteristics Of Coal And Rock Mass, Wang Gang, Jiang Chenghao, Chen Xuechang
Coal Geology & Exploration
In order to explore the stress distribution around the pores of coal and rock mass under different loading modes, the skeleton model of coal and rock mass with different pore shapes was constructed through CT three-dimensional reconstruction technology, and uniaxial and triaxial compression experiment simulations were conducted using ABAQUS software. The results showed that under uniaxial compression, the upper and lower regions of spherical pores showed tensile stress concentration, while the left and right regions showed compressive stress concentration. The stress concentration types in the long and short axis of elliptic pores were distinct with different dip angles. Under uniaxial …
Study On The Optimization Of Well Location And Extraction Life In Mining Disturbed Zone Of Yuecheng Mine In Jincheng, Wu Xi, Li Guofu, Wang Zheng, Fu Junhui, Zheng Fei, Zhou Xianjun
Study On The Optimization Of Well Location And Extraction Life In Mining Disturbed Zone Of Yuecheng Mine In Jincheng, Wu Xi, Li Guofu, Wang Zheng, Fu Junhui, Zheng Fei, Zhou Xianjun
Coal Geology & Exploration
The aim of the study is to reduce the coalbed gas accumulation in the upper corner caused by U-type ventilation in the working face of Yuecheng Coal Mine, Jincheng City, and improve the production and extraction life of coalbed methane surface wells in the mining disturbed area and goaf. Based on the research of surface mining test wells in Chengzhuang Mine and Sihe Mine, and taking the geological conditions of coalbed methane in Yuecheng Coal Mine as the engineering design basis, this paper puts forward that the well location in the surface mining disturbed area should be close to the …
Thoughts On Mine Water Control And Treatment In Yushen Mining Area, Fan Limin, Sun Kui, Li Cheng, Ning Kuibin, Ji Ruijun
Thoughts On Mine Water Control And Treatment In Yushen Mining Area, Fan Limin, Sun Kui, Li Cheng, Ning Kuibin, Ji Ruijun
Coal Geology & Exploration
In order to scientifically explain the water gusting(bursting) events with large water inflow in Yushen mining area and provide basic information for mine water control and treatment, this paper analyzes the water bursting events and large mine water gusting situations in recent years, and questions such as formation mechanism of large water inflow in mine, hydrogeological property of red soil layer and accuracy of mine inflow prediction are put forward. It expounds how to break through the "mine field" scope and study groundwater system and water bursting source in terms of regions and focus on weakly water-rich aquifers such as …
Experimental Study On Dynamic Prediction Of Coal Seam Floor Elevation In Heading Face, Liu Wenming, Cheng Jianyuan, Liu Zaibin, Zhang Zeyu
Experimental Study On Dynamic Prediction Of Coal Seam Floor Elevation In Heading Face, Liu Wenming, Cheng Jianyuan, Liu Zaibin, Zhang Zeyu
Coal Geology & Exploration
Speedy drivage urgently needs to build a high-precision two-dimensional geological model. Taking the XY-S working face of Qinshui coalfield as an example, based on the results of 3D seismic interpretation, the coal seam floor elevation measured during excavation is used to update in succession the 3D seismic average velocity field and the coal seam floor elevation ahead, thus the prediction accuracy ahead of heading is analyzed statistically. The results show that the error between the predicted coal seam floor profile and the actual exposed profile decreases gradually by constantly making use of the measured coal seam floor elevation, upgrading the …
Research Progress Of Drilling And Borehole Completion Technologies In Broken Soft Coal Seam In Underground Coal Mine, Wang Li, Yao Ningping, Yao Yafeng, Wang Yi, Zhang Jie, Fang Jun, Wei Hongchao
Research Progress Of Drilling And Borehole Completion Technologies In Broken Soft Coal Seam In Underground Coal Mine, Wang Li, Yao Ningping, Yao Yafeng, Wang Yi, Zhang Jie, Fang Jun, Wei Hongchao
Coal Geology & Exploration
In China, broken soft coal seams are in many strata and widely distributed. It is generally characterized by complex tectonic stress, high gas pressure, low mechanical strength and poor permeability, therefor, the hole is easy to collapse, outburst, which will probably cause many problems such as drilling difficulties, frequent accidents in the hole, inadequate hole depth, borehole blockage, drainage blind area and so on. With the continuous increase of coal mining depth, it is more difficult for drilling and completion in broken soft coal seam. Therefore, the high efficiency, deep hole and precise drilling technology, as well as the completion …
Sustainability Impacts Of Building Energy Use Management, John Lattanze
Sustainability Impacts Of Building Energy Use Management, John Lattanze
Sustainability Research & Practice Seminar Presentations
No abstract provided.
Wetlands Now! What Are Wetlands And What Does Usepa Region 2 Do To Protect Them?, Marco Finocchiaro
Wetlands Now! What Are Wetlands And What Does Usepa Region 2 Do To Protect Them?, Marco Finocchiaro
Sustainability Seminar Series
Wetlands are important features in the landscape that provide numerous benefits for people and for fish and wildlife. Some of these benefits include protecting and improving water quality, providing fish and wildlife habitats, sustaining cultural uses, and storing floodwaters. In this presentation, Marco Finocchiaro will introduce us to how USEPA Region 2 accomplishes national wetland program goals, including increasing the quantity and quality of these valuable resources, through establishing standards for reviewing discharges that affect wetlands, conserving and restoring wetland acreage, and improving wetland condition in partnership with other federal agencies, as well as states, tribes, local governments.
West Chester Borough Urban Forest: An Environmental Benefit For All, Michael B. Dunn, Joan Welch
West Chester Borough Urban Forest: An Environmental Benefit For All, Michael B. Dunn, Joan Welch
Sustainability Research & Practice Seminar Presentations
No abstract provided.
Lean Six Sigma & Sustainability, Brion Hurley
Lean Six Sigma & Sustainability, Brion Hurley
Sustainability Seminar Series
Lean and Six Sigma are improvement methodologies that have helped organizations and businesses save money, improve delivery performance, reduce inventory and improve quality for decades. These techniques can also be used to help reduce negative impacts on the environment (energy, waste and landfill usage), and improve government agencies, education systems, nonprofits, healthcare, and more.
Teaching Transition: Organizing Sustainably Through Service-Learning, Megan A.K. Schraedley
Teaching Transition: Organizing Sustainably Through Service-Learning, Megan A.K. Schraedley
Sustainability Research & Practice Seminar Presentations
No abstract provided.
Campus Carbon Footprint Study At A South Texas University, Monica Garcia, Christian Florez, Diego Lopez, Jongmin Kim, Maysam Pournik
Campus Carbon Footprint Study At A South Texas University, Monica Garcia, Christian Florez, Diego Lopez, Jongmin Kim, Maysam Pournik
Mechanical Engineering Faculty Publications
A campus carbon footprint study was conducted at the University of Texas Rio Grande Valley, a Southern Texan university. This initiative was the school’s strategic plan to set a baseline for overall campus resource utilization status as well as to answer global requests to track and reduce campus greenhouse gas emissions and achieve greater sustainability on campus. For fiscal years of 2016 to 2018, an overall increase of campus carbon footprint was about 0.6%. The biggest increase was observed from sources owned or controlled by the school while the emissions associated with power usage decreased. The university’s carbon footprint was …
The Acoustic Camera As A Tool To Identify Belt Conveyor Noises, Piotr Bortnowski, Anna Nowak-Szpak, Maksymilian Ozdoba, Robert Król
The Acoustic Camera As A Tool To Identify Belt Conveyor Noises, Piotr Bortnowski, Anna Nowak-Szpak, Maksymilian Ozdoba, Robert Król
Journal of Sustainable Mining
This paper explores the possibilities of using an acoustic camera as a tool that allows the verification of the correct construction and operation of individual elements of a belt conveyor. Based on the simultaneously recorded components - a video camera and measuring microphones, the sound pressure level map of the belt conveyor was created. The tests were carried out in laboratory conditions and covered the location and identification of individual noise sources. The verification consists not only of searching for dominant sound sources, but above all, of searching for frequencies in the analysed spectrum that should not occur during their …
A Systematic Review Of The Use Of Environmental Economics In The Mining Industry, Maria Menegaki, Dimitris Damigos
A Systematic Review Of The Use Of Environmental Economics In The Mining Industry, Maria Menegaki, Dimitris Damigos
Journal of Sustainable Mining
Environmental economics is increasingly being used in project appraisals, environmental liability estimates and design of market-based instruments. Mining, an actor capable of causing adverse effects on the environment, human health and well-being, has already been affected by these developments, at a great extent. Up to date, several research studies have been carried out to monetise the externalities of mining projects. Nevertheless, a systematic review of these publications has not been carried out, yet. This paper aims to fill this gap in the literature by investigating (i) the main non-market valuation techniques used; (ii) the main external costs or benefits of …
Renewable Energy And Trade: Meeting The Paris Agreement’S Goals Through A Two-Step Jurisprudential Advance, Lisa Benjamin
Renewable Energy And Trade: Meeting The Paris Agreement’S Goals Through A Two-Step Jurisprudential Advance, Lisa Benjamin
Minnesota Journal of Law, Science & Technology
No abstract provided.
Generation Of 3d Model Of Downtown Sullivan, Jim Speer
Generation Of 3d Model Of Downtown Sullivan, Jim Speer
2020 Fall Reports (Sullivan)
The City of Sullivan identified the downtown area as an area for improvement and needed a way to depict areas. In ENVI 610, one graduate student was able to address the agreed upon goals of developing a 3D model of the downtown square. Some recommendations for future use of the 3D model were made for land-use planning, drainage systems, elevation, and more.
Increased Carbon Capture By A Silicate-Treated Forested Watershed Affected By Acid Deposition, Lyla L. Taylor, Charles T. Driscoll, Peter M. Groffman, Greg H. Rau, Joel D. Blum, David J. Beerling J. Beerling
Increased Carbon Capture By A Silicate-Treated Forested Watershed Affected By Acid Deposition, Lyla L. Taylor, Charles T. Driscoll, Peter M. Groffman, Greg H. Rau, Joel D. Blum, David J. Beerling J. Beerling
Advanced Science Research Center
Meeting internationally agreed-upon climate targets requires carbon dioxide removal (CDR) strategies coupled with an urgent phase-down of fossil fuel emissions. However, the efficacy and wider impacts of CDR are poorly understood. Enhanced rock weathering (ERW) is a land-based CDR strategy requiring large-scale field trials. Here we show that a low 3.44 t ha−1 wollastonite treatment in an 11.8 ha acid-rain-impacted forested watershed in New Hampshire, USA, led to cumulative carbon capture by carbonic acid weathering of 0.025–0.13 t CO2 ha−1 over 15 years. Despite a 0.8–2.4 t CO2 ha−1 logistical carbon penalty from mining, grinding, transportation, and spreading, by 2015 …
Leadership Insights: Life Stories Of Three Individuals' Paths To National Leadership In Prek-12 Education For Sustainability, Alice Altfillisch Earle
Leadership Insights: Life Stories Of Three Individuals' Paths To National Leadership In Prek-12 Education For Sustainability, Alice Altfillisch Earle
Educational Studies Dissertations
Abstract This study focused on the narratives of three national leaders in the field of Education for Sustainability (EfS) for the purpose of illuminating pathways to leadership in PreK-12 EfS for educators and school leaders. Stanger’s (2011) eco-sociological model of human development and learning was used as a framework for examining contextual influencers of participants’ formative experiences associated with family of origin, land/places where they grew up, and education as well as pivotal experiences that informed their Prek-12 EfS leadership development. Five themes related to sustainability also served as core concepts throughout this study: positionality, spirituality, social justice, equity, and …
Sustainable Bioproduction By Rhodopseudomonas Palustris Tie-1 Through Metabolic Engineering, Wei Bai
Sustainable Bioproduction By Rhodopseudomonas Palustris Tie-1 Through Metabolic Engineering, Wei Bai
McKelvey School of Engineering Graduate Student Theses & Dissertations
The heavy reliance of the petroleum industry for raw material and the rising atmospheric CO2 caused by this reliance have driven the research and development of sustainable alternatives. Microbial production of chemicals, such as fuel and plastic, has been viewed as a feasible method. The wide selection of substrates by microbes enables them to produce chemicals using naturally abundant material or industrial waste, such as CO2, making the production sustainable. Compared to the model organisms such as Escherichia coli, Saccharomyces cerevisiae, many non-model organisms have a broader selection for carbon, electron, and nitrogen sources, making them great candidates for sustainable …
Contextual And Organizational Factors In Sustainable Supply Chain Decision-Making: Grey Relational Analysis And Interpretative Structural Modeling, Zhaojun Yang, Xiaoting Guo, Jun Sun, Yali Zhang
Contextual And Organizational Factors In Sustainable Supply Chain Decision-Making: Grey Relational Analysis And Interpretative Structural Modeling, Zhaojun Yang, Xiaoting Guo, Jun Sun, Yali Zhang
Information Systems Faculty Publications
Sustainable supply chain emerges as a major business trend essential to long-term competitive advantage. Relevant corporate decisions concern a broad range of factors and require novel analytical models for critical control. This study conducts mathematical analyses to identify the factors that are vital yet receiving insufficient attention from researchers and practitioners. Valid survey observations were collected from 113 enterprises in China, the biggest emerging economy that faces the dilemma between development and sustainability. Grey relational analysis (GRA) and interpretative structural modeling (ISM) assess the importance levels of contextual and organizational factors and explore their joint effects. Validated with conventional expert …