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Articles 6361 - 6390 of 10505
Full-Text Articles in Engineering
Cutter Elements For Drill Bits And Methods For Fabricating Same, Guodong Zhan, Biju Pillai Kumar, Russell C. Gilleylen, Michael D. Hughes, Xinhua Liang
Cutter Elements For Drill Bits And Methods For Fabricating Same, Guodong Zhan, Biju Pillai Kumar, Russell C. Gilleylen, Michael D. Hughes, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
A method of fabricating a PCD cutter element including a diamond table including a plurality of coated diamond particles fabricated using an atomic layer deposition (ALD) process.
Evaluation Of Unmanned Aircraft Flying Qualities Using A Stitched Learjet Model, Patrick M. Callaghan
Evaluation Of Unmanned Aircraft Flying Qualities Using A Stitched Learjet Model, Patrick M. Callaghan
Theses and Dissertations
In recent years, military UAVs have taken over missions that were too dull, dirty, or dangerous for manned aircraft. The increased demand has led to a build-fly-fix-fly development mentality, plaguing the early lifecycle with staggering mishap rates. Currently, MIL-STD-1797 lists flying qualities for UAVs as TBD, and the standards for manned fixed wing are inadequate when applied to UAVs. In an effort to expand the database of UAV flying qualities, an analysis was completed on a Simulink model of an LJ-25D developed from Calspans Variable Stability System aircraft at the United States Test Pilot School. Three maneuvers were simulated: (1) …
Assessing Data Availability And Research Reproducibility In Hydrology And Water Resources, James H. Stagge, David E. Rosenberg, Adel M. Abdallah, Hadia Akbar, Nour A. Atallah, Ryan James
Assessing Data Availability And Research Reproducibility In Hydrology And Water Resources, James H. Stagge, David E. Rosenberg, Adel M. Abdallah, Hadia Akbar, Nour A. Atallah, Ryan James
Civil and Environmental Engineering Faculty Publications
There is broad interest to improve the reproducibility of published research. We developed a survey tool to assess the availability of digital research artifacts published alongside peer-reviewed journal articles (e.g. data, models, code, directions for use) and reproducibility of article results. We used the tool to assess 360 of the 1,989 articles published by six hydrology and water resources journals in 2017. Like studies from other fields, we reproduced results for only a small fraction of articles (1.6% of tested articles) using their available artifacts. We estimated, with 95% confidence, that results might be reproduced for only 0.6% to 6.8% …
Limits To The World’S Green Water Resources For Food, Feed, Fiber, Timber, And Bioenergy, Joep F. Schyns, Arjen Y. Hoekstra, Martijn J. Booij, Rick J. Hogeboom, Mesfin Mekonnen
Limits To The World’S Green Water Resources For Food, Feed, Fiber, Timber, And Bioenergy, Joep F. Schyns, Arjen Y. Hoekstra, Martijn J. Booij, Rick J. Hogeboom, Mesfin Mekonnen
Daugherty Water for Food Global Institute: Faculty Publications
Green water––rainfall over land that eventually flows back to the atmosphere as evapotranspiration––is the main source of water to produce food, feed, fiber, timber, and bioenergy. To understand how freshwater scarcity constrains production of these goods, we need to consider limits to the green water footprint (WFg), the green water flow allocated to human society. However, research traditionally focuses on scarcity of blue water––groundwater and surface water. Here we expand the debate on water scarcity by considering green water scarcity (WSg). At 5 × 5 arc-minute spatial resolution, we quantify WFg and the maximum sustainable level to this footprint (WFg,m), …
15 Outstanding Students Recognized At Awards Banquet | College Of Engineering, Utah State University
15 Outstanding Students Recognized At Awards Banquet | College Of Engineering, Utah State University
College of Engineering News
The College of Engineering extends its heartfelt congratulations to the 15 undergraduate students recognized at Friday’s Engineers Week Awards Banquet.
Faculty Award Winners Recognized At Awards Banquet |College Of Engineering, Utah State University
Faculty Award Winners Recognized At Awards Banquet |College Of Engineering, Utah State University
College of Engineering News
The College of Engineering extends its congratulations to the two faculty award winners recognized at Friday’s Engineers Week Awards Banquet.
Progress In The Research On Drilling Technology And Equipment In Coal Mining Areas Of China, Li Quanxin, Shi Zhijun, Tian Hongliang, Yao Ke, Liu Jianlin, Yao Yafeng, Xu Chao, Fang Jun, Liu Fei
Progress In The Research On Drilling Technology And Equipment In Coal Mining Areas Of China, Li Quanxin, Shi Zhijun, Tian Hongliang, Yao Ke, Liu Jianlin, Yao Yafeng, Xu Chao, Fang Jun, Liu Fei
Coal Geology & Exploration
Drilling technology and equipment play a key role in coalbed methane(gas) development and ensuring coal mine safe production in coal mining areas. The complicated geological and mining conditions of coal seams in China determine that the drilling technology and equipment must be based on the basic situation of coal mining areas and take the way of independent innovation. The representative achievements of drilling technology and equipment in coal mining area during the Eleventh Five-Year Plan and the Twelfth Five-Year Plan were systematically summarized in this paper. Additionally, it presents comprehensive introduction to the great achievements of surface drilling and underground …
Research On Key Technology Of The 15 000 N·M High-Power Directional Drilling Rig, Fang Peng
Research On Key Technology Of The 15 000 N·M High-Power Directional Drilling Rig, Fang Peng
Coal Geology & Exploration
According to the actual demand for ultra-long distance directional drilling in coal seam and large diameter directional drilling in seam roof, and the function of compound directional drilling technology for drilling rig, the technical idea of modular development for the functional development and design of high-power directional drilling rig are put forward. Combined with the contradiction among high-power matching, large capacity output and compact layout design of drilling rig, the key technologies of 15 000 N·m high-power directional drilling rig are researched in this paper, including overall layout design, large capacity rotary head design and layer board analysis, large opening …
Design Of Remote Control System Of Drilling Rig In Coal Mines, Weng Yinsheng, Wu Di, Lu Feifei, Wang Longpeng
Design Of Remote Control System Of Drilling Rig In Coal Mines, Weng Yinsheng, Wu Di, Lu Feifei, Wang Longpeng
Coal Geology & Exploration
In order to solve the influence of the dangerous conditions in the deep mine, such as large percus-sive ground pressure and high temperature and humidity of the roadways in deep mines on drilling operation, a remote control drilling rig control system is designed. The control system consists of local control terminal and remote control terminal, both communicating by CAN(Controller Area Network) bus and optical fiber for data and image. Local control terminal core uses automobile PLC(Programmable Logic Controller) as the control core to realize data acquisition and control, develops program in CoDeSys. The remote control terminal, based on MCU and …
Hole-Bottom Hydraulic Pressurization Technology For Directional Drilling In Hard Rock In Underground Coal Mines, Xu Baolong, Yao Ningping, Wang Li, Cao Jing, Dou Xuqian
Hole-Bottom Hydraulic Pressurization Technology For Directional Drilling In Hard Rock In Underground Coal Mines, Xu Baolong, Yao Ningping, Wang Li, Cao Jing, Dou Xuqian
Coal Geology & Exploration
In order to solve the problem of large feeding pressure, low drilling efficiency and limited hole depth caused by the backing effect of drill string during directional drilling of deep hole in underground coal mines, a technical idea of using hydraulic tool to increase WOB was proposed. The structural design of the hydraulic pressurizer at the bottom of the hole was carried out by drawing on the structure of the hydraulic pressurizer in the field of oil drilling and combining the nearly horizontal drilling conditions in underground coal mines. The hydraulic parameters were designed by the theoretical calculation and the …
Progress And Prospects Of Coal Geological Work In Tibet, Qiao Junwei, Ning Shuzheng, Song Shiyu, Yang Cheng
Progress And Prospects Of Coal Geological Work In Tibet, Qiao Junwei, Ning Shuzheng, Song Shiyu, Yang Cheng
Coal Geology & Exploration
Through the summary of the coal geological work and achievements in Tibet for nearly 70 years, the current status and main results of coal geological exploration in the main coal mines in the region were reviewed. The formation age, distribution range, coal content and coal quality characteristics of coal-bearing strata in major coal mines in the region were found out. The division of coal-bearing tectonic units and coal-accumulating basins in Tibet was summarized, and the sedimentary systems and sedimentary environments of coal-bearing strata in the main coal-forming periods were preliminarily summarized. It is generally believed that the overall degree of …
Geological Consideration For Site Selection Of Underground Coal Gasifier, Han Lei, Qin Yong, Wang Zuotang
Geological Consideration For Site Selection Of Underground Coal Gasifier, Han Lei, Qin Yong, Wang Zuotang
Coal Geology & Exploration
Underground coal gasification(UCG) is a revolution in traditional coal mining technology, and the site selection of underground coal gasifier is a prerequisite for a successful UCG project. Refining and analyzing the previous research results, the principle of UCG and the geological controls of site selection of underground coal gasifier were reviewed. The results show that lignite is the most suitable for UCG. UCG should choose thickness greater than 2 m, angle is less than 70° and buried depth of coal seam is 300 to 2 000 meters. At the same time, the UCG process may pollute the groundwater, and the …
Fracture Extension Law Of Hydraulic Fracture In Coal With Different Structure, Jia Qifeng, Ni Xiaoming, Zhao Yongchao, Cao Yunxing
Fracture Extension Law Of Hydraulic Fracture In Coal With Different Structure, Jia Qifeng, Ni Xiaoming, Zhao Yongchao, Cao Yunxing
Coal Geology & Exploration
To find out the fracture extension law of coal hydraulic fracturing with different coal body structures can lay a foundation for reasonable well pattern deployment. Taking Shizhuang block of Qinshui basin as the research object, the fracture of coal core was observed, and four kinds of coal with fracture development degree were divided. Based on the theory of rock mass mechanics, the stress field calculation model of fracture tip and the judgment criterion of whether hydraulic fracture can pass through natural fracture in hydraulic fracturing process were established. According to the measured data of CBM wells, the reliability of theoretical …
Study On Pore Structure And Pressure-Sensitive Effect Of Tectonic Coal In Huaibei Xutuan Mine, Dong Kui, Jia Jiancheng, Gong Zewen, Wu Yan
Study On Pore Structure And Pressure-Sensitive Effect Of Tectonic Coal In Huaibei Xutuan Mine, Dong Kui, Jia Jiancheng, Gong Zewen, Wu Yan
Coal Geology & Exploration
In order to discuss pore structure and pressure-sensitive effect of tectonic coal, coal samples of Huaibei Xutuan mine were measured by optical microscope, scanning electron microscope, mercury injection, and triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling to reveal the pore structure and the influence of effective stress on permeability or permeability coefficient of structural coal. The results show that cataclastic structure of tectonic coal is regular, flat and has good connectivity; the pores of primary coal are mainly composed of micropores, micropores and transitional pores are dominant in tectonic coal has. The effective stress of ductile deformed coal has a …
Preparation Of Polished Slice Of Special Coal And Its Influence On Coal Petrology Analysis, Liu Shande
Preparation Of Polished Slice Of Special Coal And Its Influence On Coal Petrology Analysis, Liu Shande
Coal Geology & Exploration
Coal petrology analysis is widely used in coal facies research, geological exploration and coal blending test. Qualified polished coal slice is the premise of coal petrology analysis. In order to solve the preparation problem of special coal optical plates, such as brittle samples and aging coal optical plates, a complete preparation process was raised, and the feasibility of the process was verified. The results showed that Rmax was very little affected by secondary preparation, but the maceral group composition content was significantly affected, and the fluctuation of the anthracite' microcomponent was the greatest. When the maceral group composition quantification …
Analysis Of Diffusion Properties Of Methane In Low Rank Coal, Meng Zhaoping, Zhang Guiyuan, Li Guoqing, Liu Jinrong
Analysis Of Diffusion Properties Of Methane In Low Rank Coal, Meng Zhaoping, Zhang Guiyuan, Li Guoqing, Liu Jinrong
Coal Geology & Exploration
Diffusion properties of methane in coal is an important reservoir parameter affecting CBM production. Using the lignite samples from the Xiaolongtan Formation of the Miocene Neogene in southeastern Yunnan Province, the isothermal adsorption experiments of methane in low rank coal were carried out. Based on the relationship between adsorption amount and time obtained from isothermal adsorption experiment, the diffusion coefficient of methane in coal was calculated by using an unipore model of unsteady gas diffusion. The diffusion law of methane in coal and its control mechanism were revealed. The results show that gas diffusion law in coal obeys Langmuir equation; …
Reservoir-Forming Conditions Of Shale Gas In Badaowan Formation In Fukang Area, Xinjiang, Zhang Min, Li Xianqing, Zhang Jizhen, Sun Jie, Liang Wanle, Duan Zhiyou, Li Hanqing
Reservoir-Forming Conditions Of Shale Gas In Badaowan Formation In Fukang Area, Xinjiang, Zhang Min, Li Xianqing, Zhang Jizhen, Sun Jie, Liang Wanle, Duan Zhiyou, Li Hanqing
Coal Geology & Exploration
In order to evaluate the potential of shale gas of coal measures in Fukang area, Xinjiang, taking the shale of Jurassic coal measures in Badaowan Formation as an example, the study was carried out and the favorable accumulation area for shale gas was preliminarily put forward according to the drilling, core data and sample analysis results in this paper. The result shows that the accumulative thickness of Jurassic Badaowan Formation shale is big(200-400 m), the buried depth is shallow(<1 500 m), the organic carbon content is high(average TOC>2.0%), mainly of type Ⅲ and Ⅱ2, thermal evolution level is moderate(Rran is 0.8%-1.1%, mature), physical property of reservoir …
Modification Of Na-K-Mg Triangular Diagram And Selection Of Na-K Geothermometer, Wang Xin, Qi Jihong, Xu Mo, Ma Xiaoyun
Modification Of Na-K-Mg Triangular Diagram And Selection Of Na-K Geothermometer, Wang Xin, Qi Jihong, Xu Mo, Ma Xiaoyun
Coal Geology & Exploration
Na-K-Mg triangular diagram is a preliminary method of determining the water-rock equilibrium state. It does not specifically consider the effect of geothermometer equations and mineral compositions on the equilibrium state. Therefore, using the Na-K-Mg triangular diagram modified by different Na-K geothermometer equations to judge water-rock equilibrium state, and using the suitable Na-K geothermometer equation to calculate the temperature of geothermal reservoirs, is of great significance to divide the genetic types of geothermal systems and develop or utilize geothermal resources. It is found that any point in the modified Na-K-Mg triangular diagram is fully equilibrated with the curve determined by one …
Coal Mine Water Inrush Prediction Based On Lstm Neural Network, Dong Lili, Fei Cheng, Zhang Xiang, Cao Chaofan
Coal Mine Water Inrush Prediction Based On Lstm Neural Network, Dong Lili, Fei Cheng, Zhang Xiang, Cao Chaofan
Coal Geology & Exploration
According to the prediction of water inrush from coal seam floor, based on the summarization of existing water inrush prediction methods and theories, the feature selection experiment shows that water pressure, distance from the working surface, sandstone section thickness, coal thickness, coal seam inclination, fault throw, fissure zone, mining area, mining height and strike length are the main factors affecting the occurrence of water inrush. These factors are complex and non-linear. A water inrush prediction model based on long short-term memory(LSTM) neural network was proposed. The data of the coal mine water inrush case was used as sample data to …
Influence Of Composite Roof Structure On The Stability Of Coal Roadway, Chen Xinnian, Wang Jingchun, Xiong Xianyu, Fan Jiawei, Shen Pan
Influence Of Composite Roof Structure On The Stability Of Coal Roadway, Chen Xinnian, Wang Jingchun, Xiong Xianyu, Fan Jiawei, Shen Pan
Coal Geology & Exploration
The composite roof structure of coal roadway is rather complex. Its stability is related to lithology, thickness of strata, number of strata, location of strata and cohesive force between layers. Based on mechanics theory of simplified composite roof composite beams, a simplified mechanical test model of composite beams was established, and the effects of the structural characteristics of composite roof on the stability of composite beams were analyzed by experiments. The purpose is to provide a scientific basis for the classification and control of composite roof stability. The results show that the stability of the roof increases with the increase …
Numerical Analysis Of Temperature Field Of Underwater Dredging Artificial Frozen Plate, Wu Yuwei, Hu Jun, Wang Zhixin, Zeng Dongling, Wang Shucheng
Numerical Analysis Of Temperature Field Of Underwater Dredging Artificial Frozen Plate, Wu Yuwei, Hu Jun, Wang Zhixin, Zeng Dongling, Wang Shucheng
Coal Geology & Exploration
In order to understand the development of the temperature field of artificial freeze dredging plates and the process of the formation of frozen curtains, the finite element analysis was used to perform numerical analysis using the single factor analysis method for research of the frozen process in different circumstances of geometric size of plate and physical environment of the soil under water. The results show that the correlation between the different geometric dimensions of the frozen plate and the dredging depth is weak, and the geometric dimension of the frozen plate can only change the area of dredging; for the …
Study On Complex Resistivity Of Artificial Sandstone Containing Conductive Mineral Under High Pressure, Tian Gang, Tang Xingong, Xiang Kui, Chi Meiyao
Study On Complex Resistivity Of Artificial Sandstone Containing Conductive Mineral Under High Pressure, Tian Gang, Tang Xingong, Xiang Kui, Chi Meiyao
Coal Geology & Exploration
Due to the complex pore structure and non-single skeleton composition, natural rock samples are more difficult to study than artificial rock samples. The standard rock samples with different mineral content and volume content were artificially synthesized by using brass powder, pyrite sand, graphite powder, epoxy resin, etc. Complex resistivity measurements were taken to the samples by using AutoLab-1000 equipment under different formation pressure conditions. The complex resistivity and the parameters of zero frequency resistivity, polarizability, and time constant of the artificial sandstone standard were derived based on Debye decomposition model. Made a discussion on relationship between parameters of the model, …
Properties Of Mud Cake Associated With Silica Shale Powder Intrusion Into Drilling Fluid, Mo Dingqiang, Sun Pinghe, Zhao Binkui, Wang Jingyuan, Zhang Shaohe, Cao Han
Properties Of Mud Cake Associated With Silica Shale Powder Intrusion Into Drilling Fluid, Mo Dingqiang, Sun Pinghe, Zhao Binkui, Wang Jingyuan, Zhang Shaohe, Cao Han
Coal Geology & Exploration
Drilling fluid is very important for maintaining the stability of the hole wall in shale drilling. The mud cake formed by the fluid loss also plays a decisive role in protecting the reservoir. In order to study the influence of shale rock powder intrusion into low-solid-phase drilling fluids on the basic properties of mud cakes, the paper selects the siliceous shale powders in northwestern Hunan as the research object, and designs orthogonal experiments. In addition, the test results are analyzed using variance and range, which show that the content of rock powder is the main factor affecting the thickness of …
Theoretical Research On The Ploughing Rock Breaking Properties Of New Conical Pdc Cutter, Ju Pei, Wang Chuanliu
Theoretical Research On The Ploughing Rock Breaking Properties Of New Conical Pdc Cutter, Ju Pei, Wang Chuanliu
Coal Geology & Exploration
The researches on the conical PDC cutter are now focused on numerical simulation, field and laboratory tests, the theoretical analysis on its mechanical properties has not been reported. Therefore, the tensile shear rock breaking mechanism and cutting load distribution characteristics of the conical PDC cutter are described by numerical simulation, the theoretical formula of the cutting load is derived according to the energy balance principle. Results show that comparing with the conventional cylindrical PDC cutter, the rock breaking process of conical PDC cutter is more stable, the cutting load is influenced by the rock properties, the parameters of cutter structure, …
Model Of Gas-Bearing Coal Permeability Prediction Based On Apso-Wls-Svm, Mao Zhiyong, Huang Chunjuan, Lu Shichang, Han Rongyue
Model Of Gas-Bearing Coal Permeability Prediction Based On Apso-Wls-Svm, Mao Zhiyong, Huang Chunjuan, Lu Shichang, Han Rongyue
Coal Geology & Exploration
In order to predict gas-bearing coal permeability accurately and prevent gas accidents effectively, a weighted least square support vector machine(WLS-SVM) algorithm based on Adaptive Particle Swarm Optimization(APSO) is proposed. Based on the related theory and literature research on gas-bearing coal permeability, the effective stress, gas pressure, temperature and compressive strength were selected as the main characteristic indexes. The APSO algorithm was used to optimize the combination parameters(C, σ) of the WLS-SVM model and APSO-WLS-SVM gas-bearing coal permeability prediction model was established. According to the field data, 40 sets of data were used as training samples and the remaining …
Study On Development Height Of Permeable Fractured Zone Based On Overburden Failure Transfer, Zhao Gaobo, Guo Wenbing, Lou Gaozhong, Ma Zhibao
Study On Development Height Of Permeable Fractured Zone Based On Overburden Failure Transfer, Zhao Gaobo, Guo Wenbing, Lou Gaozhong, Ma Zhibao
Coal Geology & Exploration
It is extremely significant for coal mining under water bodies and water conservation mining to research overburden failure and the height of permeable fractured zone. The processes of overburden failure transfer were analyzed, which could be divided into transmission development stage and transmission termination stage. Through theoretical analysis, mechanical model of strata suspended integrity and overhanging stability were established. The limited suspension distance and overhang distance of each stratum were proposed to judge the damage of each layer. A new theoretical method to predict the development height of permeable fractured zone was put forward. The project example was compared with …
Flight Data Analysis: A Mixed Methodology Construct, Tori Kobayashi, Brent D. Bowen, Brian J. Roggow
Flight Data Analysis: A Mixed Methodology Construct, Tori Kobayashi, Brent D. Bowen, Brian J. Roggow
Student Works
This exploratory study utilizes large data sets emanating from flight data recorders on a fleet of general aviation training aircraft. These flight data sets reveal and provide potential correlations between pilot experience levels and in-flight engine events within a flight school environment. The origin of this research comes from the collection of flight data that is produced during a flight school aircraft operation and analyzed by an Aviation Safety staff at a major flight training university. These data were collected over a period of six calendar months during the calendar year 2018. The raw data is analyzed through a Flight …
Design Of Parameter Monitoring Software For Full Hydraulic Drilling Rig Based On Embedded Technology, Liao Jiangnan, Jiang Nan, Song Haitao, Dong Hongbo, Ma Bin
Design Of Parameter Monitoring Software For Full Hydraulic Drilling Rig Based On Embedded Technology, Liao Jiangnan, Jiang Nan, Song Haitao, Dong Hongbo, Ma Bin
Coal Geology & Exploration
In order to reduce the development cost of the coal mine hydraulic drilling rig monitoring and diagnosis system, realize the versatility and portability of the monitoring and diagnosis system, and simplify the operation process, an embedded parameter monitoring software for the domestic mainstream full hydraulic drilling rig was designed. The software took STM32F407 microprocessor as the running environment and was developed in the environment of Visual Studio 2013 with C language. After completing GUI simulation on emWin Simulation, the software function verification experiment was carried out on the ZDY4000LR drilling rig. The experiment shows that the software ran stably and …
Data Modeling And Analysis Of Coal Resources Based On 3dmine Software, Liu Xiaoning, Luo Jinhui, Ma Xiaoli, Dong Zhibo
Data Modeling And Analysis Of Coal Resources Based On 3dmine Software, Liu Xiaoning, Luo Jinhui, Ma Xiaoli, Dong Zhibo
Coal Geology & Exploration
Taking No.3 coal in Gucheng coal mine, Shandong Province as the target, 3D coal seam entity models were built in 3DMine software, coaly quality indices' distributions were analyzed and coal reserve was calculated and compared to the reserve estimation in method of geological block. Firstly, a boreholes database is established using the geological data and borehole data of the target, and a 3D surface model of the coal seam with faults embedded was constructed. Then, the surface model was interpolated into an entity blocks model through the algorithm of inverse distance weighted(IDW) interpolation. Finally, the recoverable coal reserve of the …
Characteristics Of Height Of Water Flowing Fractured Zone Caused During Ful-Ly-Mechanized Caving Mining In Huanglong Coalfield, Li Chaofeng
Coal Geology & Exploration
In order to study the law of height of water flowing fractured zone caused by fully-mechanized caving mining in Huanglong coalfield, this paper has systematically collected the measured data in the region, and methods of mathematical statistics and regression analysis were used to study the relationship among the height of water flowing fractured zone, width of working face, depth of coal seam and height of coal mining. The results show that:When the width of working face was less than 240 m and the height of coal mining was 8.5 to 9.5 m, the height of water flowing fractured zone under …