Engineering Commons^™

Feasibility Study On The Principle Of Punching-Shearing Composite Rock Fragmentation Mode Of Connecting Holes In Rock Strata, Wang Chuanliu

Coal Geology & Exploration

Replacing roadway with borehole is an important research direction of underground coal mine drilling technology, which has the advantages of high efficiency and low cost. However, in the construction of large diameter connecting holes in rock strata, the multi-stage reaming method has such problems as long lifting and drilling time and low efficiency of hole formation. This paper proposes the principle of punching-shearing composite rock fragmentation through structural and technological innovation without changing the configuration of drilling equipment. It is a creative combination of punching rock fragmentation of high-pressure water-impactor-inner bit rock and shearing rock fragmentation of drilling rig-drilling pipe-outer …

Analysis On The Deployment Of Mining Research Supported By The Grant Program Of Deep Resources Exploration And Mining, Fan Jun, Zhang Jialin, Qin Yuan, Wang Hao, Gao Yanan, Pei Yongzhi

Coal Geology & Exploration

The Deep Resources Exploration and Mining(DREAM) grant program, within the framework of The National Key Research and Development Program grants, is a pillar to implement China’s science and technology strategy in the area of deep resources exploitation. To tackle the insufficient of theories and technologies for the 1000-meter-deep mining, a section of mining, covering the research of basic theories, general technologies and application demonstration, was arranged in the layout of DREAM under the principle of "whole chain design, integrated implementation". In the aspect of basic research, DREAM mainly focused on the deep rock mechanics and mining theory, such as the …

Experimental Study On Multi-Scale Pore Structure Characteristics Of Tar-Rich Coal In Yushenfu Mining Area, Shen Yanjun, Wang Xu, Zhao Chunhu, Wang Shengquan, Guo Chen, Shi Qingmin, Ma Wen

Coal Geology & Exploration

Extracting oil and refining gas from oil-rich coal is an important measure to make up for the shortage of oil and gas supply in China. The research on pore development characteristics and permeability of tar-rich coal will help to better develop and utilize tar-rich coal. Taking the tar-rich coal in Yushenfu mining area as the research object, this paper studies the multi-scale pore structure and the whole segment pore characterization of tar-rich coal by such methods as low-temperature liquid nitrogen adsorption, mercury intrusion porosimetry, nuclear magnetic resonance and gas permeability measurement method. Based on the test results of multi-scale pore …

Prediction Model Of Coalbed Methane Content Based On Well Logging Parameter Optimization, Chen Tao, Zhang Zhansong, Zhou Xueqing, Guo Jianhong, Xiao Hang, Tan Chenyang, Qin Ruibao, Yu Jie

Coal Geology & Exploration

With the development of coalbed methane(CBM) exploration, higher accuracy of CBM content prediction is required. Based on the response characteristics of CBM logging, the correlation between logging parameters and gas content is analyzed, and the optimization strategy of logging parameters by combining MIV technology with LSSVM is proposed. The optimal logging parameters are selected as the input independent variables of network modeling, and the core parameters of LSSVM(Least Squares Support Vector Machine) network are optimized by particle swarm optimization. Finally, a set of MIV-PSO-LSSVM model suitable for CBM content prediction is constructed. The prediction performances of LSSVM, PSO-LSSVM, MIV-LSSVM, MIV-PSO-LSSVM …

Modeling Of Bearing Voltage In Electric Machines Based On Electromagnetic Fea And Measured Bearing Capacitance, Peng Han, Greg Heins, Dean Patterson, Mark Theile, Dan M. Ionel

Power and Energy Institute of Kentucky Faculty Publications

Bearing voltages and associated bearing currents in electric machines driven by pulsewidth modulation converters with high switching frequencies and high dv/dt can cause premature bearing failures. This article proposes a new modeling approach for the prediction of steady-state and transient bearing voltages based on two-dimensional (2-D) electromagnetic finite element analysis with coupled external circuits using measured bearing capacitance values. The distributed-element external circuit was employed mainly to take into account the influence of wire distribution and frequency dependency, which are typically neglected by traditional equivalent circuits. The developed model was then used to simulate bearing voltages for various scenarios and …

Analysis Of Interlayer Interference In Combined Development Of Coalbed Methane Wells And Discussion On Combined Production Methods：A Case Study Of Shoushan No.1 Coal Mine In Pingdingshan, Xu Yaobo

Coal Geology & Exploration

The combined development of multiple coal seams is a key technology to increase the production of single CBM wells. However, in engineering practice, most coal seams have interlayer interference problems, resulting in an insignificant increase in combined development gas production. In order to improve the gas production and development efficiency of combined development in coalbed methane wells, taking the combined production of coalbed methane in the No.4-2 coal seam and the No.2-1 coal seam of the Shoushan No.1 Coal Mine in Pingdingshan as an example, this paper analyses the influence factors and interference rules of interlayer interference, and proposes the …

Model Tests On The Red Clay Foundation Reinforced By The Natural Coir Fiber, Li Liangyong, Ma Weidi, Xie Peng, Cao Qian, Huang Ruilong

Coal Geology & Exploration

Due to the advantages of low cost, good seismic performance, simple construction, etc., reinforcement method has become a common method of foundation improvement. However, the geosynthetic used in the reinforcement method is not natural and environmentally friendly. To solve this problem, the natural coir fiber is used to reinforce the red clay foundation in this paper. The effect of the coir fiber reinforcement depth on the deformation and bearing capacity of the red clay foundation is studied through load tests. The distribution law of the earth pressure along depth is analyzed. The results show that the load bearing ratio increases …

Application And Development Of Permanent Magnet Torque Motor In Down-Hole Tools For Oil And Gas Drilling And Production, Li Wei, Deng Lang, Zou Xing, Xia Yang, Chen Xi

Coal Geology & Exploration

Permanent magnet torque motor is a kind of a power driving device with great development potential. It has several advantages, such as high torque density, fast response speed, strong overload capacity, high efficiency and energy saving, therefore, it possesses wide application prospects in many fields in both industrial production and daily life and so on. In view of the current application overview and technical requirements of permanent magnet torque motors in oil and gas drilling and production down-hole intelligent tools, firstly, this paper briefly introduces the structure composition and working principle of permanent magnet torque motor. Then, it elaborates the …

High Speed Switching For Plasma Based Electroporation, Shivangi Sharma

USF Tampa Graduate Theses and Dissertations

Ever since mankind has started identifying the diseases, extensive work has been done, and pathologies are written identifying the cure for them. As technology progressed, the development in the field of pathologies also did. Thus, finding innovative and efficient ways to get the ‘cure’. With the advancement in drugs, the delivery methods for these drugs also have advanced. One such delivery method is gene therapy. This method is beneficial when genes are to be used to prevent diseases.

Gene therapy has been proven effective for treating a wide range of conditions, such as cancer, heart diseases, and diabetes. Gene therapy …

Analysis And Modeling Of Strategic Interactions In Health Systems To Improve Patient Care Access, Jorge A. Acuña Melo

USF Tampa Graduate Theses and Dissertations

Affordable health care access that provides well-coordinated and high-quality services on time is a goal that governments and health organizations strive for. Regrettably, most countries deal with access problems that affect the population's health, such as long waiting lists for specialized medical services, overcrowding of emergency departments, and high health prices. In the present doctoral dissertation, I model and analyze the strategic interactions that inhabit the health system machinery to uncover possible structural problems that led to the aforementioned issues. The study involves operation research, data science, and game theory techniques to address the health care access predicament.

Each research …

Water Inrush Mechanism Of Thick Alluvium Aquifer With High Pressure Based On The “Bidirectional Fractures” Model In Huainan And Huaibei Mining Area, Liu Qimeng, Liu Yu, Xie Zhigang, Bai Hanying, Fu Xiang, Miao Changjun

Coal Geology & Exploration

The coal reserves under Quaternary thick alluvium with high pressure are huge in Huainan and Huaibei Mining Areas. In the process of increasing the upper limit mining near the alluvium, water inrush accidents often occur. However, it is difficult to reasonably explain the mechanism of such accidents by using the traditional aupper three zonesa theory. In this paper, the hydrogeological and engineering geological conditions of thick alluvium with high pressure are analyzed, and the abidirectional fracturesa model is established. Laboratory experiment, numerical simulation, theoretical analysis, and engineering application inspection are used to study the development law of downward infiltration zone …

Classification Method Of Coal And Rock Drillability Based On Mechanical Specific Energy Theory, Xie Zhijiang, Chang Xue, Yang Lin, Pi Yangjun

Coal Geology & Exploration

The drillability classification of the surrounding rock during the drilling process of coal mine gas drainage through the Mechanical Specific Energy(MSE) can provide a basis for the drilling rig to adjust the drilling parameters. Aiming at the problems of difficulty and low efficiency of manual layer identification in the process of gas drainage and drilling, a coal and rock drillability classification method based on MSE as the drillability evaluation index combined with Extreme Learning Machine(ELM) is proposed. A simulation model of PDC bit crushing rock was established by ABAQUS, and the changing law of drilling speed and MSE in the …

Research On The Evolution Law Of Roadway Surrounding Rock Fissure Based On Fractal Dimension, Ding Wanqi, Ma Zhenqian, Zu Ziyin, Xie Hongfei, Yang Wei, Chen Chuan

Coal Geology & Exploration

To explore the evolution law of surrounding rock fissures under the influence of horizontal stress and dynamic disturbance in argillaceous roadways, the deformation and failure characteristics of argillaceous roadways, the evolution law of surrounding rock fissures and the fractal evolution characteristics of surrounding rock fissures under dynamic disturbance are studied by such methods as field investigation, numerical simulation and fractal theory analysis, with the 226 track gate of Shanjiaoshu Mine in Panzhou City as the engineering background. The results show that before dynamic disturbance, the expansion range of fracture zone and plastic zone of roadways gradually increases with the increase …

Creating A Field-Wide Forage Canopy Model Using Uavs And Photogrammetry Processing, Cameron Minch, Joseph S. Dvorak, Joshua J. Jackson, Stuart Tucker Sheffield

Biosystems and Agricultural Engineering Faculty Publications

Alfalfa canopy structure reveals useful information for managing this forage crop, but manual measurements are impractical at field-scale. Photogrammetry processing with images from Unmanned Aerial Vehicles (UAVs) can create a field-wide three-dimensional model of the crop canopy. The goal of this study was to determine the appropriate flight parameters for the UAV that would enable reliable generation of canopy models at all stages of alfalfa growth. Flights were conducted over two separate fields on four different dates using three different flight parameters. This provided a total of 24 flights. The flight parameters considered were the following: 30 m altitude with …

The Origin Of Coal Measure Breccia In Jinggong No.3 Coal Mine, Pingshuo, Shanxi, Shi Yanqiang

Coal Geology & Exploration

The genesis and occurrence of coal measure breccia in Jinggong No.3 Coal Mine of Pingshuo are special and closely related to the coal seams. Through core observation of supplementary drilling, combined with regional geology and analysis of previous drilling data, the composition, structure and structural characteristics of breccia in the study area are described in detail, and the horizon, thickness and distribution of breccia are delineated. It is found that the composition of breccia in Jinggong No.3 Coal Mine of Pingshuo is complex, and the size of breccia is different. The maximum diameter of mudstone is more than 1.20 m, …

Experimental Study On The Influence Of Coal-Based Co2 Geological Storage On Roof Fracture Conductivity, Zhu Shiliang, Shao Liwei, Zhou Xiaozhi, Cao Yutong, Zhang Kun, Wang Jiandong

Coal Geology & Exploration

Coal-based CO₂ geological storage is an important way to reduce greenhouse gas emissions, but there is also a safety risk of underground CO₂ leakage. In order to evaluate the safety of coal-based CO₂ geological storage, the roof samples of No.3 coal seam in Hudi Coal Mine, southern Qinshui Basin were collected, and the changes of artificial fracture morphology, whole rock mineral composition and CO₂ conductivity of columnar samples in "CO₂-H₂O-Rock" reaction were studied by simulation experiments. The results show that calcite vein dissolution, secondary mineral filling and external effective stress jointly affect …

Research On Wireline Sealed Coring Equipment And Technology For Coalbed Methane Content Determination, Long Weicheng, Sun Siqing

Coal Geology & Exploration

Coalbed methane content is an important technical parameter for the development and utilization of coalbed methane resources and the prevention and control of mine gas. In order to solve the problem of deviation of coalbed methane content measurement results caused by inaccurate estimation of coal core loss gas volume in the process of surface well coalbed methane content determination, the wireline sealing coring device for surface well coal seam is developed, and the wireline sealing coring technology for surface well coal seam is proposed. The upper end of the coal seam wireline sealing coring device is designed with wireline fishing …

Surface Subsidence Control Technology Of Multi-Bed Separation Grouting, Ma Hewen

Coal Geology & Exploration

In order to enhance the injection ratio to meet the surface subsidence controlling requirements without obvious thick-and-hard strata in overburden for generating large-scale bed separation, the multi-bed separation grouting method is proposed in this paper. The scale model test is used to study the spatiotemporal evolution of overburden due to multi-bed separation grouting. The field measurements is proven that multi-bed separation grouting can successfully mitigate overburden failure and subsidence by increasing the boreholes number, and multi-bed separation grouting has successfully applied in Huaibei mining area. Filling masses with different diffusion radii are commonly formed in the different bed separation, which …

Mining Subsidence Analysis Of Gently Inclined Coal Seams Based On Flac3d And Dem Data, Gan Zhihui, Shang Hui, Du Rongjun, Zhan Huizhu

Coal Geology & Exploration

Shizuishan Mining Area in Ningxia Province is located in the western Yellow River. The subsidence of the mined-out area causes frequent surface ecological and environmental problems. The analysis of coal mining subsidence will play a positive role in environmental remediation the Yellow River Basin. Taking Shizuishan Coal Mine as an object to study the evolution characteristics of surrounding rock stress and displacement field of gently inclined coal seam, a three-dimensional numerical model of the gently inclined coal seam based on the numerical simulation software FLAC^3D was established. The variation of stress, plastic zone, and displacement in the surrounding rocks …

Variation Law And Influencing Mechanism Of Surface Movement Parameters In Shendong Mining Area, Zhou Tingting, Su Lijuan, Liu Hui, Zhu Xiaojun

Coal Geology & Exploration

The mining areas in western China generally have the characteristics of large reserves, shallow depth and simple overlying rock structure, and mining activities in such areas have a significant impact on the surface. In order to study the variation law of surface deformation and rock movement parameters in Shendong Mining Area, the dynamic deformation of the surface was studied based on the measured data of working face 22201 of Daliuta Coal Mine. Then the relationship between surface movement parameters and geological mining conditions were obtained from the measured data of 18 working faces in Shendong Mining Area, and the influence …

Targeted Processing Method For Seismic Data Of Karst Caves And Goafs In Nanchuan Area, Meng Qingli, Ren Junxing, Yang Fan

Coal Geology & Exploration

In order to solve the problem of poor imaging effect of near surface karst cave and goaf location seismic data in seismic exploration, this paper summarizes the frequency, energy and signal-to-noise ratio characteristics of seismic data in this area using forward modeling combined with actual data analysis. On this basis, a set of corresponding processing methods are proposed, including micro log constrained tomography static correction, weak signal extraction and compensation, pre-stack five dimensional data regularization and structure constrained grid tomography velocity modeling. Through the application in Nanchuan area, the signal-to-noise ratio and wave group continuity of seismic data are obviously …

The Application Of Opposing Coils Transient Electromagnetics In The Detection Of Karst Subsidence Area, Xie Jia, Liu Yang, Li Xingqiang, Lu Yulong, Li Ganlong

Coal Geology & Exploration

Ground collapse caused by karst is both disastrous and covert. In order to forecast and control it effectively, a research area with strong karst collapse development was selected in this study, and a method that combines Opposing Coils Transient Electromagnetics with engineering geological drilling was used to verify the formation occurrence through the factors including buried depth of overburden, resistivity and isoline variation. The results of geophysical inversion maps and borehole information verification show that the Opposing Coils Transient Electromagnetics method can effectively identify the development of underground corrosion. Especially in the area where the conventional geophysical exploration methods may …

Borehole-Roadway Seismic-While-Mining Tomography Using Correlation Time Difference, Wang Yunhong, Wang Baoli, Cheng Jianyuan, Cui Weixiong, Jin Dan

Coal Geology & Exploration

Using shearer as a source, seismic-while-mining(SWM) technology has realized dynamic, accurate and green intelligent detection in fully mechanized mining faces, and can be used to detect static geological anomaly and dynamic mining geological disasters within the work face. Conventional SWM observation system has the defect of blind area. To solve this problem, a new observation system with detectors installed in both roadway and within boreholes are proposed, which effectively improved the imaging range. Based on seismic interferometry principle, using frequency domain correlation algorithm, this paper turns the SWM signal to explosive source signal, and computes the equivalent shot sets. In …

The Application Of Pneumatic Directional Drilling Technology In Gas Pre-Drainage Of Strips In Soft Coal Seams, Zhang Jie

Coal Geology & Exploration

It is costly and inefficient to drill through floor tunnel to eliminate outburst in soft coal roadway strip in Huaibei Mining Area. The bedding pneumatic directional borehole technology can accurately control the borehole trajectory in the strip coal seam according to the design, and realize the outburst elimination of the strip coal roadway through drilling gas extraction. Based on soft coal seam characteristics of the Huaibei Mining Area, the coal lane stripes drainage of gas in the directional hole design, selection of pneumatic directional drilling equipment, directional bore blastholes and shield technology, the evaluation of extraction effect are studied. The …

Robotic Technologies For High-Throughput Plant Phenotyping: Contemporary Reviews And Future Perspectives, Abbas Atefi, Yufeng Ge, Santosh Pitla, James Schnable

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Phenotyping plants is an essential component of any effort to develop new crop varieties. As plant breeders seek to increase crop productivity and produce more food for the future, the amount of phenotype information they require will also increase. Traditional plant phenotyping relying on manual measurement is laborious, time-consuming, error-prone, and costly. Plant phenotyping robots have emerged as a high-throughput technology to measure morphological, chemical and physiological properties of large number of plants. Several robotic systems have been developed to fulfill different phenotyping missions. In particular, robotic phenotyping has the potential to enable efficient monitoring of changes in plant traits …

Comparison Of Promoter, Dna Vector, And Cationic Carrier For Efficient Transfection Of Hmscs From Multiple Donors And Tissue Sources, Tyler Kozisek, Andrew Hamann, Luke Samuelson, Miguel Fudolig, Angela K. Pannier

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Human mesenchymal stem cells (hMSCs) are primary cells with high clinical relevance that could be enhanced through genetic modification. However, gene delivery, particularly through nonviral routes, is inefficient. To address the shortcomings of nonviral gene delivery to hMSCs, our lab has previously demonstrated that pharmacological “priming” of hMSCs with clinically approved drugs can increase transfection in hMSCs by modulating transfection-induced cytotoxicity. However, even with priming, hMSC transfection remains inefficient for clinical applications. This work takes a complementary approach to addressing the challenges of transfecting hMSCs by systematically investigating key transfection parameters for their effect on transgene expression. Specifically, we investigated …

A Kinematic Error Controller For Real-Time Kinematic Error Correction Of Industrial Robots, Mitchell R. Woodside, Joseph Fischer, Patrick Bazzoli, Douglas A. Bristow, Robert G. Landers

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Industrial robots are being used more and more for manufacturing applications that require accuracy beyond what can be obtained from joint measurement. While offline calibration techniques such as volumetric error compensation can be used to correct robot kinematic error, these methods are unable to compensate for robot deformations caused by changing tool loads during the manufacturing operation. This paper explores the use of a real-time robot kinematic error compensation technique where an external high-precision feedback sensor (in this case a laser tracker) directly measures the robot kinematic error and corrections are implemented during processing. A robot kinematic error model is …

Influence Of Coating Defects Within The Lock Seams On The Corrosion Performance Of Aluminized Steel Drainage Pipes, Mohammed Al Yaarubi

USF Tampa Graduate Theses and Dissertations

The electrochemical behavior of aluminized steel is investigated to determine the corrosion performance of coating deficiencies generated within the lock seams during the fabrication of aluminized steel corrugated pipe. Electrochemical techniques and visual and profilometric analysis are used to assess the ability of the aluminum and zinc coating to provide sufficient galvanic protection to the underlying steel in the presence of a crevice. Also, Crevice coupons and lock-seam samples were used in this investigation in different environmental conditions simulating natural water conditions to relate the corrosion rate with the level of protection that the coating will provide. In addition, a …

Development Of A Numerical Process Model For Adsorbent-Amended Constructed Wetlands, Lillian Mulligan

USF Tampa Graduate Theses and Dissertations

There is a need for alternative methods for municipal landfill leachate treatment as the high concentrations of pollutants in leachate interfere with processes at publicly owned treatment works (POTWs). Constructed wetlands (CWs) have been shown to be a sustainable alternative with good removal efficiencies for chemical oxygen demand (COD) and ammonia nitrogen (NH4+). The addition of an adsorbent media, such as zeolite and biochar, to CWs to further enhance removal efficiencies has been investigated in recent years. However, the long-term effects of zeolite and biochar addition to CWs is not well known. A model could be a useful tool to …

Flow Visualization And Aerosol Characterization Of Respiratory Jets Exhaled From A Mannequin Simulator, Sindhu Reddy Mutra

USF Tampa Graduate Theses and Dissertations

It is important to understand the airborne transmission of infectious diseases due to the COVID-19 pandemic. Physical experiments were conducted to understand the dispersion of aerosols emitted from a mannequin simulator replicating human tidal breathing through the nose and mouth with and without a protective face mask in an enclosed space. Flow patterns are observed via high-speed visualization, and the concentration and size distribution of the particles is measured as a function of distance from the mannequin using an optical particle sizer. Masks were shown to effectively reduce the horizontal dispersion of aerosol for both mouth and nose breathing. Further, …