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Full-Text Articles in Engineering

The Santa Clara, 2023-04-21, Santa Clara University Apr 2023

The Santa Clara, 2023-04-21, Santa Clara University

The Santa Clara

No abstract provided.

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Ransomware: What Is Ransomware, And How To Prevent It, Brandon Chambers Apr 2023

Ransomware: What Is Ransomware, And How To Prevent It, Brandon Chambers

Cybersecurity Undergraduate Research Showcase

This research paper answers the question, “What is Ransomware, and How to prevent it?”. This paper will discuss what ransomware is, its history about ransomware, how ransomware attacks Windows systems, how to prevent ransomware, how to handle ransomware once it is already on the network, ideas for training professionals to avoid ransomware, and how anti-virus helps defend against ransomware. Many different articles, case studies, and professional blogs will be used to complete the research on this topic.

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A Statistical Approach For Analyzing Expectations Alignment Between Design Teams And Their Project Stakeholders, Matthew Christian Goodson Apr 2023

A Statistical Approach For Analyzing Expectations Alignment Between Design Teams And Their Project Stakeholders, Matthew Christian Goodson

Theses and Dissertations

Successful project management requires continuous communication aligning the expectations between project stakeholders and the project team. Expectations include both product expectations (how the product will look, feel, and perform) and programmatic expectations (timelines, deliverables, expenditure of project resources). In order to make the most effective use of project resources throughout the life of the project, a process or tool for quickly aligning expectations as closely as possible should be employed early on in the project. Project management literature is lacking in tools for aligning expectations, and solutions and best practices need to be determined since the current best option is …

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Gradient-Based Optimization Of Highly Flexible Aeroelastic Structures, Taylor G. Mcdonnell Apr 2023

Gradient-Based Optimization Of Highly Flexible Aeroelastic Structures, Taylor G. Mcdonnell

Theses and Dissertations

Design optimization is a method that can be used to automate the design process to obtain better results. When applied to aeroelastic structures, design optimization often leads to the creation of highly flexible aeroelastic structures. There are, however, a number of conventional design procedures that must be modified when dealing with highly flexible aeroelastic structures. First, the deformed geometry must be the baseline for weight, structural, and stability analyses. Second, potential couplings between aeroelasticity and rigid-body dynamics must be considered. Third, dynamic analyses must be modified to handle large nonlinear displacements. These modifications to the conventional design process significantly increase …

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Editorial: Disease Biomarker Analysis Based On Optical Biosensing, Tianshu Chen, Fanben Meng, Binwu Ying, Xiaoli Zhu Apr 2023

Editorial: Disease Biomarker Analysis Based On Optical Biosensing, Tianshu Chen, Fanben Meng, Binwu Ying, Xiaoli Zhu

Department of Mechanical and Materials Engineering: Faculty Publications

Disease biomarker analysis has become a crucial tool for diagnosing and evaluating disease prognosis, especially with the increasing understanding of diseases at the molecular level. Abnormalities in various biomarkers can indicate diseased states, and can be used to rapidly and specifically detect and quantify diseases using optical biosensing techniques (Gao et al., 2023). Optical biosensing techniques have several advantages over traditional methods including higher sensitivity, specificity, and faster analysis times (Plikusiene and Ramanaviciene, 2023). It also allows for non-invasive sample collection. With advancements in optical biosensing technology, many medical conditions including cancers, infectious diseases, and autoimmune disorders can be accurately …

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Enhancing Neural Text Detector Robustness With Μattacking And Rr-Training, Gongbo Liang, Jesus Guerrero, Fengbo Zheng, Izzat Alsmadi Apr 2023

Enhancing Neural Text Detector Robustness With Μattacking And Rr-Training, Gongbo Liang, Jesus Guerrero, Fengbo Zheng, Izzat Alsmadi

Computer Science Faculty Publications (Archived)

With advanced neural network techniques, language models can generate content that looks genuinely created by humans. Such advanced progress benefits society in numerous ways. However, it may also bring us threats that we have not seen before. A neural text detector is a classification model that separates machine-generated text from human-written ones. Unfortunately, a pretrained neural text detector may be vulnerable to adversarial attack, aiming to fool the detector into making wrong classification decisions. Through this work, we propose µAttacking, a mutation-based general framework that can be used to evaluate the robustness of neural text detectors systematically. Our experiments demonstrate …

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Effects Of Tempering Temperature On Gas Turbine Fan Cases, Seth Utter Apr 2023

Effects Of Tempering Temperature On Gas Turbine Fan Cases, Seth Utter

Honors Scholar Theses

The project aimed to investigate the effects of tempering temperature on metals used for gas turbine engine fan cases as a major relevant concern is containing blades in during blade-out events. There are three ways to accomplish this: using a thicker metal, incorporating different materials into the case, or heat treating the metal. This project focused on the third solution: reviewing the impact toughness and hardness of fractured samples and their equivalent ductile-to-brittle transition shear faces. Given its availability, 1045 steel, as opposed to aerospace grade metals, was used for in-house testing. The data obtained from these experiments were then …

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Pla-S-Tech: Pla Sustainable Technology, Sean Sapper, Ryan Decarlo, Elle Whitney, Samantha Dombrowski, Dalton Prokop, Dominic Zaio, Tyler Stokes, David Deese, Blake Hengel, Yi Guo Apr 2023

Pla-S-Tech: Pla Sustainable Technology, Sean Sapper, Ryan Decarlo, Elle Whitney, Samantha Dombrowski, Dalton Prokop, Dominic Zaio, Tyler Stokes, David Deese, Blake Hengel, Yi Guo

Mechanical and Civil Engineering Student Publications

To recycle waste material produced by fused deposition modeling (FDM) 3D printers, a recycler was designed and manufactured to convert plastic scraps into usable filament. The device does so by breaking down plastic material to a uniform size with the shredder, melting and compressing these pieces into a cylindrical strand with the extruder, and wrapping this strand around a filament spool with the spooler. As the device is mostly made from commercially-available components, it is easily maintainable and user-serviceable, while also costing less than similar devices on the market.

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Outboard Onset Of Ross Orogen Magmatism And Subsequent Igneous And Metamorphic Cooling Linked To Slab Rollback During Late-Stage Gondwana Assembly, Timothy Paulsen, John Encarnación, Anne Grunow, Jeffrey Benowitz, Paul Layer, Chad Deering, Jakub Sliwinski Apr 2023

Outboard Onset Of Ross Orogen Magmatism And Subsequent Igneous And Metamorphic Cooling Linked To Slab Rollback During Late-Stage Gondwana Assembly, Timothy Paulsen, John Encarnación, Anne Grunow, Jeffrey Benowitz, Paul Layer, Chad Deering, Jakub Sliwinski

Michigan Tech Publications, Part 1

Changes in magmatism and sedimentation along the late Neoproterozoic-early Paleozoic Ross orogenic belt in Antarctica have been linked to the cessation of convergence along the Mozambique belt during the assembly of East-West Gondwana. However, these interpretations are non-unique and are based, in part, on limited thermochronological data sets spread out along large sectors of the East Antarctic margin. We report new 40Ar/39Ar hornblende, muscovite, and biotite age data for plutonic (n = 13) and metasedimentary (n = 3) samples from the Shackleton–Liv Glacier sector of the Queen Maud Mountains in Antarctica. Cumulative 40Ar/39Ar age data show polymodal age peaks (510 …

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Editorial: Disease Biomarker Analysis Based On Optical Biosensing, Tianshu Chen, Fanben Meng, Binwu Ying, Xiaoli Zhu Apr 2023

Editorial: Disease Biomarker Analysis Based On Optical Biosensing, Tianshu Chen, Fanben Meng, Binwu Ying, Xiaoli Zhu

Department of Mechanical and Materials Engineering: Faculty Publications

Disease biomarker analysis has become a crucial tool for diagnosing and evaluating disease prognosis, especially with the increasing understanding of diseases at the molecular level. Abnormalities in various biomarkers can indicate diseased states, and can be used to rapidly and specifically detect and quantify diseases using optical biosensing techniques (Gao et al., 2023). Optical biosensing techniques have several advantages over traditional methods including higher sensitivity, specificity, and faster analysis times (Plikusiene and Ramanaviciene, 2023). It also allows for non-invasive sample collection. With advancements in optical biosensing technology, many medical conditions including cancers, infectious diseases, and autoimmune disorders can be accurately …

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Region-Specified Inverse Design Of Absorption And Scattering In Nanoparticles By Using Machine Learning, Alex Vallone, Nooshin M. Estakhri, Nasim Mohammadi Estrakhri Apr 2023

Region-Specified Inverse Design Of Absorption And Scattering In Nanoparticles By Using Machine Learning, Alex Vallone, Nooshin M. Estakhri, Nasim Mohammadi Estrakhri

Engineering Faculty Articles and Research

Machine learning provides a promising platform for both forward modeling and the inverse design of photonic structures. Relying on a data-driven approach, machine learning is especially appealing for situations when it is not feasible to derive an analytical solution for a complex problem. There has been a great amount of recent interest in constructing machine learning models suitable for different electromagnetic problems. In this work, we adapt a region-specified design approach for the inverse design of multilayered nanoparticles. Given the high computational cost of dataset generation for electromagnetic problems, we specifically investigate the case of a small training dataset, enhanced …

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Mental Health In Aviation: A Study Of Aviation Students On Their Perceptions Of The Federal Aviation Administration’S Rules Governing Mental Health, Laila Stein Apr 2023

Mental Health In Aviation: A Study Of Aviation Students On Their Perceptions Of The Federal Aviation Administration’S Rules Governing Mental Health, Laila Stein

Honors Theses

This study aims to understand collegiate aviation students, faculty, staff, and flight instructors’ perceptions of the Federal Aviation Administration’s (FAA) regulations governing mental health assistance. It also aims to examine the impact of the perceptions held by students, faculty, staff, and flight instructors regarding their desire to seek mental health assistance. A study at Western Michigan University’s (WMU) College of Aviation (COA) was developed to test the hypothesis that students, faculty, staff, and flight instructors had a restrictive perception of the FAA rules regarding seeking mental health assistance, and that students, faculty, staff, and flight instructors had lower desire to …

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Aviation Mentorship Program, Joseph Zynda Apr 2023

Aviation Mentorship Program, Joseph Zynda

Honors Theses

The Aviation COR Mentorship program is a test for efficacy of a mentorship program for Western Michigan University’s College of Aviation. This paper describes what the mentorship program is and the values it is founded on. The description will break down each Core Value (these are renamed to Core Principles in the “Facilitating Improvements” section). The paper then dives into the criteria for being a mentor or mentee and the schedule of the test program. The goals are then outlined for this initial program in a chart. There are five goals for the program to assist students with the transition …

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Progress And Reflection Of Intelligent Geological Guarantee Technology In Coal Mining Face, Wang Guofa, Zhang Jianzhong, Xue Guohua, Liu Zaibin, Liu Qing, Li Mei, Liu Junfeng, Cheng Jian, Zhang Xueliang Apr 2023

Progress And Reflection Of Intelligent Geological Guarantee Technology In Coal Mining Face, Wang Guofa, Zhang Jianzhong, Xue Guohua, Liu Zaibin, Liu Qing, Li Mei, Liu Junfeng, Cheng Jian, Zhang Xueliang

Coal Geology & Exploration

Coal mine geological guarantee technology is the key path to achieve accurate and green coal mining. In view of the requirements of intelligent mining and geological guarantee, the main problems faced by the geological guarantee of the mining face were analyzed, mainly including the weak basic theoretical research, insufficient geological exploration accuracy, modeling accuracy unable to meet the engineering application, difficulties in model dynamic updating, and lack of optimal decision-making means for global path of intelligent mining based on spatio-temporal evolution. According to the faced difficulties and technical status, the author explored and practiced the geological guarantee technology of intelligent …

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Electromagnetic Methods In The Detection Of Water Hazards In Coal Mines: A Review, Zhang Jifeng, Sun Naiquan, Liu Zuiliang, Qi Zhipeng Apr 2023

Electromagnetic Methods In The Detection Of Water Hazards In Coal Mines: A Review, Zhang Jifeng, Sun Naiquan, Liu Zuiliang, Qi Zhipeng

Coal Geology & Exploration

Water hazards in coal mines are a major type of hidden danger in safe coal mining. The accurate detection of hidden factors to cause hazard is the prerequisite to solving the water hazards. Electromagnetic methods, which are sensitive to low-resistivity bodies and have multiple types and high adaptability, can be used to effectively detect water-rich hazard-causing factors. Traditional ground electromagnetic methods, including the controlled source audio-frequency magnetotellurics (CSAMT) method and the loop source transient electromagnetic method, play an important role in detecting hidden hazard-causing factors in coal mines. With the continuous development of new technologies, near-source electromagnetic methods have developed …

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A Review On Research Of Reflected In-Seam Wave Detection Technology In Coal Mine, Wang Ji, Ye Hongxing, Zhang Guangzhong, Li Gang, Wu Guoqing, Niu Huan, Yang Yanjun, Guan Qi Apr 2023

A Review On Research Of Reflected In-Seam Wave Detection Technology In Coal Mine, Wang Ji, Ye Hongxing, Zhang Guangzhong, Li Gang, Wu Guoqing, Niu Huan, Yang Yanjun, Guan Qi

Coal Geology & Exploration

Reflected in-seam wave can be used in one roadway to detect the abnormal geological structures such as faults in some area on both sides of the roadway or in front of tunneling. In this paper, the data and processing method of the reflected in-seam wave were compared based on the 2 different detection areas on side of the roadway and in front of tunneling. In particular, the technical principles, applicable conditions and research progress of three imaging methods of reflected in-seam wave were analyzed and sorted out, including the stack imaging, migration imaging and advance imaging of tunneling face. Besides, …

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Detection Of Change In The Coal Thickness Of A Fully Mechanized Mining Face Based On Electromagnetic Wave Penetration, Wu Rongxin, Li Xiang, Xiao Yulin Apr 2023

Detection Of Change In The Coal Thickness Of A Fully Mechanized Mining Face Based On Electromagnetic Wave Penetration, Wu Rongxin, Li Xiang, Xiao Yulin

Coal Geology & Exploration

A fully mechanized mining face tend to show great change in coal thickness, which affects the safe, efficient coal mining. Therefore, it is necessary to detect the change in the coal thickness before stoping. To determine the response of electromagnetic (EM) wave penetration to the change in the coal thickness, this study established a three-dimensional model of fully mechanized mining faces using simulation software. On this basis, this study simulated the change in the coal thickness under different ratios of the coal-to-rock resistivity based on EM wave penetration. The results are as follows: (1) With a decrease in the coal …

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Development Status And Trend Of High-Density 3d Seismic Exploration Technology For Coal Fields, Dong Shouhua, Huang Yaping, Jin Xueliang, Yang Guangming, Nie Ailan, Qi Xuemei, Cheng Yan, Wu Haibo Apr 2023

Development Status And Trend Of High-Density 3d Seismic Exploration Technology For Coal Fields, Dong Shouhua, Huang Yaping, Jin Xueliang, Yang Guangming, Nie Ailan, Qi Xuemei, Cheng Yan, Wu Haibo

Coal Geology & Exploration

Traditional 3D seismic exploration in coal mining areas is difficult to meet the requirements of transparent and accurate geological exploration for safe and efficient coal mining due to its low precision for complex structures, lower coal seams, and limestones. In this case, high-density 3D seismic exploration technology for coal fields emerged. This technology has undergone three developmental stages in China, namely the exploration and test stage during 2005‒2007, the test and demonstration stage during 2008‒2014, and the promotion and application stage since 2015. After nearly 20 years of development, its accuracy for the exploration of complex geological structures has been …

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Source And Release Law Of Fluorine In Water-Rock System Of Coal Mine Goaf In Contiguous Area Of Shaanxi And Inner Mongolia, Wang Tiantian, Jin Dewu, Xue Jiankun, Ji Hongying, Shang Hongbo, Zhou Zhenfang, Yang Jian, Cao Yu Apr 2023

Source And Release Law Of Fluorine In Water-Rock System Of Coal Mine Goaf In Contiguous Area Of Shaanxi And Inner Mongolia, Wang Tiantian, Jin Dewu, Xue Jiankun, Ji Hongying, Shang Hongbo, Zhou Zhenfang, Yang Jian, Cao Yu

Coal Geology & Exploration

The coal mine goaf is the key area for the formation of high-fluoride mine water, and the source and release of fluorine in goaf water-rock system determines the enrichment or depletion of fluorine in mine water. Aiming at the unclear source and release rule of fluorine in the mine water of 3-1 coal goaf in the contiguous area of Shaaxi and Inner Mongolia, hydrochemical test, mineral composition analysis, mineral scanning electron microscopy and energy spectrum detection, as well as laboratory water-rock simulation experiment, were conducted to determine the source and occurrence carrier of fluorine in coal mine water, and to …

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A Preliminary Study On The Multiscale Effect Of Seismic Anisotropy Of Coal Seams At Long Wavelengths, Wang Yun, Zheng Yongqin, Yang Chun, Zhang Yi, Li Yingda, Zhang Huimin Apr 2023

A Preliminary Study On The Multiscale Effect Of Seismic Anisotropy Of Coal Seams At Long Wavelengths, Wang Yun, Zheng Yongqin, Yang Chun, Zhang Yi, Li Yingda, Zhang Huimin

Coal Geology & Exploration

Terrestrial coal-bearing strata in China are all typical thin interbeds given the seismic frequency bands of coal exploration. The isotropic thin interbeds are superimposed in the coal-bearing strata, exhibiting seismic anisotropy at long wavelengths among different seismic wavelengths, for which simplified equivalent processing, such as vertical transverse isotropy (VTI) or isotropy (ISO) approximation, is generally adopted in seismic exploration. However, the long-wave approximation has different applicable conditions for strata with different elastic properties. Taking the coal-bearing strata in the Huainan Coalfield as an example, this study established two-dimensional models of horizontal thin interbeds using acoustic and density logging curves of …

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Preparation And Characteristics Of Inorganic Curing Foam With Large-Volume Fly Ash In Goaf, Ma Li, Du Su, Zhang Zhaoyun, Wang Hui, Zhao Liang, Zhang Bo Apr 2023

Preparation And Characteristics Of Inorganic Curing Foam With Large-Volume Fly Ash In Goaf, Ma Li, Du Su, Zhang Zhaoyun, Wang Hui, Zhao Liang, Zhang Bo

Coal Geology & Exploration

Air leakage in the goaf of coal mine is an important cause of coal fire disaster. The traditional filling and plugging materials are easy to crack, with poor fluidity and high cost. Therefore, it is necessary to develop new materials for effective filling and plugging of the air leakage channels. Herein, the new filling and plugging material of inorganic curing foam with large-volume fly ash was developed by optimizing the mix ratio based on material fluidity, initial setting time and compressive strength using the single factor variable method. Meanwhile, the material hydration process was characterized by the infrared spectroscopy, X-ray …

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Technological Path And Geological Guarantee For Energy Storage In Underground Space Formed By Coal Mining, Sun Qiang, Zhang Weiqiang, Geng Jishi, Hu Jianjun, Zhang Yuliang, Lyu Chao, Ge Zhenlong, Li Pengfei, Jia Hailiang, Liu Yabin, Li Yuxiang Apr 2023

Technological Path And Geological Guarantee For Energy Storage In Underground Space Formed By Coal Mining, Sun Qiang, Zhang Weiqiang, Geng Jishi, Hu Jianjun, Zhang Yuliang, Lyu Chao, Ge Zhenlong, Li Pengfei, Jia Hailiang, Liu Yabin, Li Yuxiang

Coal Geology & Exploration

Coal resource is still in the main position of China’s energy structure, but the development of coal industry is facing the new challenge of “carbon peaking and carbon neutrality”. Actively developing coal underground space energy storage technology is an effective means to promote low-carbon and clean energy utilization, and also a key measure to ensure China’s energy strategic security. This study discussed the potential utilization of underground space formed by coal mining based on the current energy storage technologies. Focusing on new energy storage technologies such as underground pumped storage hydropower plants in coal mines (UPSHCM), thermal energy storage (TES), …

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Experimen On Mechanical Properties Of Various Graded Collapse Column Fills, Liu Weitao, Du Yanhui, Pang Lifu, Meng Xiangxi, Shen Jianjun, Hu Yingying Apr 2023

Experimen On Mechanical Properties Of Various Graded Collapse Column Fills, Liu Weitao, Du Yanhui, Pang Lifu, Meng Xiangxi, Shen Jianjun, Hu Yingying

Coal Geology & Exploration

In order to study the mechanical properties of collapse column fill under different consolidation pressures and grain compositions. Base on similar simulated rock-soil mass sample under different states of geotechinal consolidation test preparing, we investigated the mechanical characteristics and microstructure evolution mechanism of collapse column filling by conducting the triaxial loading test, mercury intrusion porosimetry and scanning electron microscopy in different states of rock-soil mass. The results show that the rock-soil mass has obvious shaping characteristics and the stress-strain curve can be divided into four stages: pore compaction stage, stable deformation stage, deformation failure stage and creep-like stage. The compressive …

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Evaluation On Spatiaotemporal Variations Of Mine Water Quality And Water Source Identification Based On Key Dominant Factors In Loess Hilly And Gully Region, Shi Longqing, Qu Xingyue, Han Jin Apr 2023

Evaluation On Spatiaotemporal Variations Of Mine Water Quality And Water Source Identification Based On Key Dominant Factors In Loess Hilly And Gully Region, Shi Longqing, Qu Xingyue, Han Jin

Coal Geology & Exploration

It is difficult to accurately identify the sources of water inrush between sandstone-mudstone interbedded overburden in loess hilly and gully region, and these proportions of different water sources cannot be quantified. For this reason. Based on the systematic collection of surface water and groundwater samples from Zhujiamao Coal Mine in northern Shaanxi. This study revealed the hydrochemical evolution laws of water quality and the recharge relationship of various aquifer systems by mathematical statistics, Piper (trilinear) diagram, Gibbs diagram and the conventional hydrochemical characteristic method. Meanwhile, this study analyzed the evolution characteristics of stable isotopic composition in water, clarified the spatial …

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Progress Of Research On Key Technologies For Hydrogeochemical Prospecting In North China Type Coalfield, Chen Luwang, Hu Yongsheng, Zhang Jie, Zhang Miao, Zheng Jian, Zheng Xin, Zhang Yuanyuan, Cai Xinyue, Wu Minghui Apr 2023

Progress Of Research On Key Technologies For Hydrogeochemical Prospecting In North China Type Coalfield, Chen Luwang, Hu Yongsheng, Zhang Jie, Zhang Miao, Zheng Jian, Zheng Xin, Zhang Yuanyuan, Cai Xinyue, Wu Minghui

Coal Geology & Exploration

North China type coalfield is an important coal base in China, and hydrogeochemical prospecting is an important means to solve a series of hydrogeological problems in the process of coal mining. The typical hydrogeological problems under the influence of mining were analyzed based on the generalization of the typical hydrogeological structure of North China type coalfield. Meanwhile, the multi-field coupling relationship of groundwater and the mechanism of hydrogeochemical prospecting in North China type coalfield, as well as its testing, analysis and treatment technology, were revealed. Besides, the reliability of hydrogeochemical prospecting technology in North China type coalfield was pointed out …

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Effect Of Foliar Application Of Dse Fungal Solution On Growth Of Morus Alba And Its Prospects Of Ecological Restoration Application, Bi Yinli, Wang Zhuoyou, Ke Zengming Apr 2023

Effect Of Foliar Application Of Dse Fungal Solution On Growth Of Morus Alba And Its Prospects Of Ecological Restoration Application, Bi Yinli, Wang Zhuoyou, Ke Zengming

Coal Geology & Exploration

Microbial reclamation technology has been widely used in the ecological restoration of western arid and semi-arid coal mining areas. Convenient application of microbial agent has important significance for improving the efficiency of ecological management in coal-mining subsidence. Herein, this study tested with Morus alba as the study object, and the dark septate endophyte (DSE) as the test fungus. using a greenhouse pot experiment with three treatments, which including the root inoculation of DSE fungus (GXZR), foliar application of DSE fungus (YMTM) and control Morus alba (CK), this study investigated the effects of different inoculation methods on the growth of Morus …

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Progress And Typical Case Analysis Of Demonstration Projects Of The Geological Sequestration And Utilization Of Co2, Liu Shiqi, Huang Fansheng, Du Ruibin, Chen Shiheng, Guan Yiting, Liu Yinghai, Wang Tao Apr 2023

Progress And Typical Case Analysis Of Demonstration Projects Of The Geological Sequestration And Utilization Of Co2, Liu Shiqi, Huang Fansheng, Du Ruibin, Chen Shiheng, Guan Yiting, Liu Yinghai, Wang Tao

Coal Geology & Exploration

The implementation of the geological sequestration and utilization of CO2 (CGSU) has considerable effects on CO2 emission reduction and is of great significance for the mitigation of global warming and the execution of the sustainable development strategy in China. Therefore, this study sorted the major methods for CGSU, made statistics of the global demonstration projects of CGSU, and primarily introduced the typical demonstration projects of CGSU in China. Furthermore, this study proposed prospects for the development trend of the CGSU technologies, which primarily include CO2 enhanced oil recovery (CO2-EOR), CO2 enhanced coalbed methane recovery …

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Evaluation Method Of Resistance To Seepage Failure Due To Mining Near Unconsolidated Aquifers I: Critical Hydraulic Gradient, Sui Wanghua Apr 2023

Evaluation Method Of Resistance To Seepage Failure Due To Mining Near Unconsolidated Aquifers I: Critical Hydraulic Gradient, Sui Wanghua

Coal Geology & Exploration

The evaluation on resistance to seepage failure is an important fundamental work for the prevention and control of water-sand mixture inrush during coal mining near the unconsolidated aquifers. However, no normative methods and standards have been developed at present. The key to evaluate the resistance to seepage failure of unconsolidated aquifers and weathered zones is to determine their hydraulic gradient and the critical hydraulic gradient. Herein, this study reviewed the determination method of critical hydraulic gradient for soil flow and internal erosion, and pointed out the different characteristics between the critical hydraulic gradient for water-sand mixture inrush near unconsolidated aquifers …

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Micro-Mechanism Of Geological Sequestration Of Co2 In Coal Seam, Yao Yanbin, Sun Xiaoxiao, Wan Lei Apr 2023

Micro-Mechanism Of Geological Sequestration Of Co2 In Coal Seam, Yao Yanbin, Sun Xiaoxiao, Wan Lei

Coal Geology & Exploration

The geological sequestration of CO2 in coal seam is a most promising carbon storage technology, which can help achieve the dual goals of CO2 emission reduction and coalbed methane stimulation. Compared with other sealing geological bodies, coal has extremely well-developed micropores. The mechanism of geological sequestration of CO2 in coal seam is closely related to the interaction of coal-gas-water. However, its internal influence mechanism is still unclear. Herein, the models of macromolecular structure and plat pore of the coals were constructed based on the systematic coal petrological analysis and testing of two bituminous coal samples. Meanwhile, the …

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Characteristics And Formation Mechanisms Of Microstructures In Coal Treated With Co2 Phase Transition Fracturing, Cao Yunxing, Zhang Xinsheng, Zhang Junsheng, Guo Shuaifang, Meng Bingbing Apr 2023

Characteristics And Formation Mechanisms Of Microstructures In Coal Treated With Co2 Phase Transition Fracturing, Cao Yunxing, Zhang Xinsheng, Zhang Junsheng, Guo Shuaifang, Meng Bingbing

Coal Geology & Exploration

CO2 phase transition fracturing (CPTF) is a newly developed technique for coal mine gas control and is characterized by high efficiency, high coal seam permeability, a high gas drainage rate, and outburst elimination. The core of CPTF is reinforced fracturing and the pressure-relief and permeability-enhancement effects of coal seams under high-pressure dynamic loading. Nevertheless, there is a lack of studies on the morphological characteristics and formation mechanisms of newly formed fractures. Current observation and description of the underground fractures on a centimeter-meter scale primarily aim to reveal the fracturing and permeability-enhancement mechanisms of low-permeability coal seams. However, the study …

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