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Articles 241 - 270 of 294
Full-Text Articles in Oil, Gas, and Energy
Application Of Mine-Hole Joint Microseismic Technology In Monitoring The Damage Depth Of Working Face Floor, Duan Jianhua, Yan Wenchao, Nan Hanchen, Zhang Qingqing, Fan Xin
Application Of Mine-Hole Joint Microseismic Technology In Monitoring The Damage Depth Of Working Face Floor, Duan Jianhua, Yan Wenchao, Nan Hanchen, Zhang Qingqing, Fan Xin
Coal Geology & Exploration
Accurate prediction of the mining damage depth of floor is a key problem in the prevention and control of mining floor water hazard especially in the case with confined water. It is very important for developing the strategy of water control. According to the geological characteristics and working face layout of Baode coal mine, Shaanxi Province, a high-precision microseismic monitoring system consisting of well and hole arrays was deployed to detect the floor damage depth in working face 81307 in real time. The velocity model was calibrated and the location accuracy was verified by hammering method. It is proved that …
Table Of Contents, The Editors
Multi-Source Information Evaluation Of Mud And Sand Inrush Disaster During The Mining Of Deep-Buried Coal Seam, Guo Xiaoming, Guo Kang, Liu Yingfeng
Multi-Source Information Evaluation Of Mud And Sand Inrush Disaster During The Mining Of Deep-Buried Coal Seam, Guo Xiaoming, Guo Kang, Liu Yingfeng
Coal Geology & Exploration
The mud and sand inrush disaster during the mining of deep-buried coal seam is caused by the disintegration of the mudstone in the coal seam roof when meeting water. It is a comprehensive disaster due to concentrated underground mud and sand gush under mine pressure. The occurrence of such disaster is affected by many factors, such as aquifer, mine pressure, and geological structure, etc. This paper took Zhaojin coal mine in Huanglong coalfield as the study area, and discussed the mechanism of the disaster. Then the main controlling factors were identified, including water yield property of Luohe Formation aquifer, distance …
Application Of Small Scale Curvature In Small And Micro-Structure Interpretation Of Coal Field, Cheng Yan
Application Of Small Scale Curvature In Small And Micro-Structure Interpretation Of Coal Field, Cheng Yan
Coal Geology & Exploration
The interpretation and delineation of small and micro-structure which acts as one of the main disaster sources in coal mine is an important guarantee for safe and efficient production of coal mines. However, it can't satisfy the geological guarantee for precise mining by only using the traditional seismic exploration methods to solve this problem. Therefore, in this paper, we reconstruct the seismic data by extracting the components above 60 Hz from the 3D seismic data, and then extract minimum negative curvature to interpret and analyze the small and micro-structures in study areas. By comparing the revealed micro-structures and explained results …
Geosteering Technology And Cbm Horizontal Well Drilling Without Pilot Hole, Liu Mingjun, Li Bing, Huang Wei
Geosteering Technology And Cbm Horizontal Well Drilling Without Pilot Hole, Liu Mingjun, Li Bing, Huang Wei
Coal Geology & Exploration
Aiming at the difficulties of hole-forming of the horizontal interval in a soft coal seam, low drilling ratio of coal seam and need of pilot hole during deflecting drilling, the key technologies such as drilling parameter optimization, anti-collapse drilling were put forward in the paper. Geosteering technology with multi-markers was used to realize timely layer identification, to search suitable targeting angle, to be adaptive to the stratum dip so as to realize one time direct landing at the target. Geosteering and geometric steering were combined to control finely the wellbore trajectory of the horizontal interval, to make the wellbore trajectory …
The Research Status And Prospect Of Coal-Based Graphite In China, Cao Daiyong, Wang Lu, Liu Zhifei, Ding Zhhengyun, Li Yang, Shu Zhenyu
The Research Status And Prospect Of Coal-Based Graphite In China, Cao Daiyong, Wang Lu, Liu Zhifei, Ding Zhhengyun, Li Yang, Shu Zhenyu
Coal Geology & Exploration
Coal-based graphite is regarded as a special and non-typical crystalline mineral and belongs to amorphous graphite, which is both the important part of graphite resources and also one of parts of coal measures mineral resources. Coal and coal-based graphite are two different mineral resources which occur at the same place. The graphitization of coal essentially show carbon enrichement and hydrogen and oxygen exclusion in elementary composition and increase of structural ordering degree and the formation of graphite crystals. Coal macerals, magmatic intrusion and geological structure are all critical factors for coal graphitization, which present different characteristics under the influence of …
Status And Development Prospect Of The Coal-Based Graphite Resources In Fujian Province, Chen Quanlin, Cheng Qiao, Deng Ruijin, Lin Xiaoyan, Wang Lu, Ding Zhengyun, Li Yang, Cheng Qiao, Lin Xiaoyan, Cao Daiyong
Status And Development Prospect Of The Coal-Based Graphite Resources In Fujian Province, Chen Quanlin, Cheng Qiao, Deng Ruijin, Lin Xiaoyan, Wang Lu, Ding Zhengyun, Li Yang, Cheng Qiao, Lin Xiaoyan, Cao Daiyong
Coal Geology & Exploration
The coal-based graphite of Fujian Province occurs in the coal-bearing strata of the Middle Permian Tong ziyan Formation, is formed by the further metamorphism of the anthracite of the Tongziyan Formation under high temperature and pressure, and belongs to the aphanitic graphite. By investigating the distribution characteristics of coal-based graphite in Fujian Province, it was found that most of the coal-based graphite mines and exploration areas are in an unmined or stopped state, and production and sale in most mining areas are in the form of coal mining, causing resources waste. In order to rationally develop and use coal-based graphite …
Metallogenic Law And Prospecting Direction Of Coal-Based Graphite In Hunan Province, Mo Jiafeng, Zhao Xunlin, Zhu Wenqing, Li Huantong
Metallogenic Law And Prospecting Direction Of Coal-Based Graphite In Hunan Province, Mo Jiafeng, Zhao Xunlin, Zhu Wenqing, Li Huantong
Coal Geology & Exploration
There are many intrusive rocks and complex structures in Hunan Province.In order to study the mineralization law of coal-based graphite, on the basis of collecting the existing geological data, drawing on the characteristics of coal-based graphite deposits at home and abroad, combining the distribution characteristics and development status of graphite resources in Hunan Province, using geological surveys, production well surveys, sampling tests, etc., the geological characteristics of the ore bodies in the existing mining areas around the two granite bodies were studied, the genetic type and ore controlling factors of the graphite deposits were explored, the genetic type is contact …
Raman Spectrum Characteristic And Structural Evolution Of High Rank Coalscryptocrystalline Graphite, Li Huantong, Wang Nan, Zhu Zhirong, Fan Jingjing, Zhang Weiguo
Raman Spectrum Characteristic And Structural Evolution Of High Rank Coalscryptocrystalline Graphite, Li Huantong, Wang Nan, Zhu Zhirong, Fan Jingjing, Zhang Weiguo
Coal Geology & Exploration
Raman spectroscopy can reflect the order degree and structural defects of carbon materials, and can be used to characterize the structural changes during the evolution of high rank coal-cryptocrystalline graphite, and analyze the relationship between Raman parameters of coal with different deformation and metamorphic degrees and the spacing of surface network(d002). The results showed that: (1) there was stepped variation between the G peak position and d002, but the graphite and high rank coal could be distinguished well. The S2 peak, the full width at half maximum of D1 and G had a good linear relationship with d002; (2) the …
Occurrence And Origin Of Graphite Microcrystal In Meta-Anthracite, Li Jiuqing, Qin Yong, Chen Yilin
Occurrence And Origin Of Graphite Microcrystal In Meta-Anthracite, Li Jiuqing, Qin Yong, Chen Yilin
Coal Geology & Exploration
Microcrystalline graphite occurs widely in meta-anthracite,to analyse the occurrence characteristics and genesis of graphite microcrystal, by methods of optical microscope, scanning electron microscope and transmission electron microscope, the optical properties, material composition and crystal structure of graphite microcrystal in Yong’an coal field of Fujian Province were characterized, and their genesis was preliminarily discussed. The results show that the graphite microcrystal in coal occurs mainly in micro cracks and cavities, and most of them have fibrous microstructure similar to petroleum coke, with bubble membrane structure. The maximum reflectivity of the microcrystal ranges from 9.29% to 10.83% and significantly stronger than the …
Investigation On Structural Evolution And Thermal Reaction Of Coal-Based Graphite From Xinhua County, Hunan Province, Li Kuo, Liu Qinfu, Song Botao, Zhang Shuai, Wu Yingke
Investigation On Structural Evolution And Thermal Reaction Of Coal-Based Graphite From Xinhua County, Hunan Province, Li Kuo, Liu Qinfu, Song Botao, Zhang Shuai, Wu Yingke
Coal Geology & Exploration
To investigate the structural evolution and thermal reaction of coal-based graphite with different graphitization,the anthracite and coal-based graphite from Xinhua County, Hunan were analyzed by X-ray diffraction (XRD), high resolution transformation electron microscope(HRTEM), and temperature programmed oxidation (TPO). The results show that carbon structure transformed from the amorphous anthracite to three dimensionally ordered graphite as graphitization degree increases. The coal-based graphite samples with different graphitization degree are composed of multi carbon phases, suggesting a heterogeneous nature of coal-based graphite, and ordered carbon phases were common in higher rank samples, however, defects can still be detected in most metamorphosed coal-based graphite. …
The Tectonic Framework And Controlling Mechanism Of Coal-Based Graphite In Lutang Mining Area, Hunan Province, Wang Lu, Peng Yangwen, Cao Daiyong, Ding Zhengyun, Mo Jiafeng
The Tectonic Framework And Controlling Mechanism Of Coal-Based Graphite In Lutang Mining Area, Hunan Province, Wang Lu, Peng Yangwen, Cao Daiyong, Ding Zhengyun, Mo Jiafeng
Coal Geology & Exploration
Lutang mining area, one of the famous coal-based graphite mining areas in China, is controlled by both the magmatic intrusions and tectonic activities. Both the graphitization of coal and occurrence are closely related to the tectonic framework. To study the influence of tectonic activity on the formation of coal-based graphite, based on the filed geological survey, observation under microscope, X-ray diffraction and Raman spectroscopy experiments, structural characteristics of the research area and characteristics of coal-based graphite were analyzed. The effect of structural control of ore on the coal-based graphite was discussed in this paper. The tectonic framework of the study …
Molecular Structure Characteristics And Model Construction Of Anthracite In Jarud, Zhang Shuai, Ma Rujia, Liu Lu, Zhang Hao, Liu Qinfu
Molecular Structure Characteristics And Model Construction Of Anthracite In Jarud, Zhang Shuai, Ma Rujia, Liu Lu, Zhang Hao, Liu Qinfu
Coal Geology & Exploration
To construct the macromolecular structure model of anthracite in Jarud of Inner Mongolia, the macromolecule structure of anthracite in this area was investigated using the methods of proximate analysis, ultimate analysis, carbon nuclear magnetic resonance(13C-NMR), high resolution transmission electron microscope(HRTEM), and X-ray photoelectric spectrometry(XPS). The results showed that aromatic carbon was the main component of macromolecule structure. Aliphatic carbon existed mainly in the form of short aliphatic chains and naphthenic hydrocarbons. The oxygen-containing functional groups in macromolecule structure of anthracite existed in the form of phenolic hydroxyl group and ether oxygen group. The nitrogen atoms were mainly in the form …
Organic Nitrogen Forms Of Different Rank Coals In Handan-Fengfeng Mining Area, China, Hao Guoqiang, Hu Sherong
Organic Nitrogen Forms Of Different Rank Coals In Handan-Fengfeng Mining Area, China, Hao Guoqiang, Hu Sherong
Coal Geology & Exploration
Nitrogen is one of the common elements in coal. The occurrence forms of nitrogen in coal are various and vary with coal rank. Based on X-ray photoelectron spectroscopy (XPS), taking Handan-Fengfeng mining area as an example, organic nitrogen forms of different rank coals(Rran = 1.08%–3.67%) were studied, and the variation of the relative abundance of each organic nitrogen with rank was further discussed. The results show that four kinds of nitrogen forms are considered for the coals according to binding energies of N 1s XPS sub-peaks, corresponding to N-6, N-5, N-Q and N-X. N-5 is the most abundant organic nitrogen …
Lithium And Gallium Abundance And Enrichment Factors In Typical Late Permian Coal-Accumulating Basin In Guangxi, Liao Jialong, Zhang Fuqiang, Wei Mengdie, Liang Xingdong
Lithium And Gallium Abundance And Enrichment Factors In Typical Late Permian Coal-Accumulating Basin In Guangxi, Liao Jialong, Zhang Fuqiang, Wei Mengdie, Liang Xingdong
Coal Geology & Exploration
Through systematic sampling and testing of two typical Late Permian coalfields in Fusui and Xian’an, starting with the lithium and gallium abundance of the samples, and combining with the metallogenic geological background of the Late Permian coal-accumulating basin in Guangxi, the factors controlling the enrichment of lithium and gallium in coal are analyzed. The results show that lithium and gallium in coal of both coalfield have certain industrial prospect. Lithium is mainly concentrated in K1 coal seam, carbonaceous mudstone and bauxite section at the bottom of Heshan Formation, while gallium abundance in each lithology at the bottom of Heshan Formation …
Key Geological Factors And Evaluation Methods For Huge Low-Rank Coalbed Methane Reservoirs：Taking Bayanhua Depression In Erlian Basin As An Example, Yao Haipeng, Lyu Weibo, Wang Kaifeng, Li Ling, Li Wenhua, Lin Haitao, Li Fengchun, Li Zheng
Key Geological Factors And Evaluation Methods For Huge Low-Rank Coalbed Methane Reservoirs：Taking Bayanhua Depression In Erlian Basin As An Example, Yao Haipeng, Lyu Weibo, Wang Kaifeng, Li Ling, Li Wenhua, Lin Haitao, Li Fengchun, Li Zheng
Coal Geology & Exploration
In order to evaluate the potential of low rank CBM resources with large thickness, Bayanhua depression in Erlian basin is studied. By studying the genesis of CBM, buried depth of coal seam, thickness of coal seam, physical properties of coal reservoir, gas content, hydrogeology and cap rock, the key geological elements of thick and low coal rank coal reservoirs are summarized. Furthermore, a new low rank CBM resource potential evaluation method is established, and the favorable and target zones for CBM exploration and development in Bayanhua depression are delineated. The results show that the main coal-bearing strata in Bayanhua depression …
“Scenario-Response”-Based Emergency Decision-Making Mechanism Of Mine Water Inrush Disaster, Lian Huiqing, Yang Junwen, Han Ruigang, Meng Lu, Han Yong
“Scenario-Response”-Based Emergency Decision-Making Mechanism Of Mine Water Inrush Disaster, Lian Huiqing, Yang Junwen, Han Ruigang, Meng Lu, Han Yong
Coal Geology & Exploration
The urgency, complexity and uncertainty of mine flood accidents determine that traditional emergency decision-making models are difficult to meet the requirements of efficient emergency rescue. Using the “scenario-response” model for emergency decision-making of mine flood accidents can effectively solve the timely real-time decision-making of specific disaster scenario after disasters occur. Using a multi-case analysis method to analyze 11 typical mine flood accidents in recent years, based on the general structural description of the accident, six elements of the mine flood scenario were summarized(inrush water source, water inrush channel, water inrush position, water output, submerged range, living space) as the scenario …
Characteristics And Sedimental Control Of Mine Water Outflow In Hujirt Mining Area, Liang Xiangyang, Yang Jian, Cao Zhiguo
Characteristics And Sedimental Control Of Mine Water Outflow In Hujirt Mining Area, Liang Xiangyang, Yang Jian, Cao Zhiguo
Coal Geology & Exploration
Hujirt mining area in Ordos basin is a deep-buried Jurassic coalfield with high water pressure, large water volume and uneven water abundance. Each mine is facing serious pressure of mine water hazard prevention and control. In order to clarify the water outflow conditions and main controlling factors of the coal seam roof of the mine in this area, the research on geological deposit and water-producing horizon of roof boreholes, water-inrush from boreholes and water-inrush from working face was carried out. The results showed that within the water conducting fractured zone of Hujirt mining area, there are mainly meandering river sedimentary …
Mining Response And Dynamic Reinforcement For Narrow Coal Pillar Next To Goaf In Working Face 1402 Of Xin’An Coal Mine, Wang Beifang, Liang Bing, Liu Wei, Zhang Jing, Chi Haibo, Liu Yahui
Mining Response And Dynamic Reinforcement For Narrow Coal Pillar Next To Goaf In Working Face 1402 Of Xin’An Coal Mine, Wang Beifang, Liang Bing, Liu Wei, Zhang Jing, Chi Haibo, Liu Yahui
Coal Geology & Exploration
with the increase of integrating coal mines under national coal de-capacity policy, the mining instability phenomenon of narrow coal pillar next to goaf is increasingly prominent, which has seriously restricted the safety and efficient production in coal mines. Therefore, stability control engineering problem of narrow coal pillar next to goaf, near No.5 drilling field on air return roadway of repeated mining face 1402 in Xin'an coal mine was as study object, a method of combining numerical simulation and theoretical analysis was used to explore the mining disturbance response characteristics of narrow coal pillar stability next to goaf, near No.5 drilling …
Anisotropic Shear Behavior Of Rock Joint Based On 3d Printing Technology, Xu Xunhui, Zhang Guobiao, Bao Han, Yan Changgen
Anisotropic Shear Behavior Of Rock Joint Based On 3d Printing Technology, Xu Xunhui, Zhang Guobiao, Bao Han, Yan Changgen
Coal Geology & Exploration
Topography is an important factor affecting the shear behavior of joint. Furthermore, there are certain connections between the anisotropy of topography and the anisotropy of shear behavior. In this study, 3D laser scanning technology and 3D printing technology were used to make molds for simulating the topography of natural joint. Then, the cement mortar samples with dimension of 100 mm×100 mm×150 mm were cast, and shear tests with different shear directions under different normal stresses were conducted. The results indicate that obvious anisotropy has been shown in the joint shear behavior, which is reflected in the peak shear strength and …
Three-Dimensional Stress Evolution And Comprehensive Treatment Technology For Super-Long Working Face Across Abandoned Roadway With Large Section, Wang Yan, Xiong Zuqiang, Zhao Gaobo
Three-Dimensional Stress Evolution And Comprehensive Treatment Technology For Super-Long Working Face Across Abandoned Roadway With Large Section, Wang Yan, Xiong Zuqiang, Zhao Gaobo
Coal Geology & Exploration
In order to solved the problem of super-long working face across abandoned roadway with large section, which is easy to cause rib spalling and roof falling, based on a super-long working face in Chengzhuang mine of Jincheng, a three-dimensional model of abandoned with large section roadway was established. The roof of working face was divided into three parts: coal pillar roof, abandoned roadway roof and mining area roof. The criterion of pillar instability was deduced and the roof stress evolution process of large section abandoned roadway was analyzed by FLAC3D numerical simulation. The results show that when the W …
Multidimensional Deformation Monitoring Using Insar Technology In Yuxian Mining Area, Du Jiantao, Yan Li, Zhao Chaoying
Multidimensional Deformation Monitoring Using Insar Technology In Yuxian Mining Area, Du Jiantao, Yan Li, Zhao Chaoying
Coal Geology & Exploration
Yuxian County in Hebei Province is one of the largest mining areas in North China. This area has been suffering serious ground deformation due to underground mining activity, which not only threatens mining safety, but also seriously damages local ecological environment. To obtain the surface deformation map of the overall mining area and to analysis the spatiotemporal evolution features, 61 C-band descending track and ascending track Sentinel-1A/B images from July 2017 to September 2018 were processed based on Interferometric Synthetic Aperture Rader(InSAR) technique. In addition, the two-dimensional deformation time series of Xixizhuang mine were obtained by using the multi-dimensional deformation …
Development And Application Of Macroscopic And Mesoscopic Analytical Testing Instrument For Reinforcement-Soil Interface Characteristics, Yi Fu, Du Changbo, Wang Zhengyun, Yu Ben
Development And Application Of Macroscopic And Mesoscopic Analytical Testing Instrument For Reinforcement-Soil Interface Characteristics, Yi Fu, Du Changbo, Wang Zhengyun, Yu Ben
Coal Geology & Exploration
To analyze the interaction characteristics of soil-reinforcement interface more comprehensively, an experimental instrument for macro-and micro-analysis of interface characteristics of visible reinforced soils was developed and can be used for direct shear and pull-out tests with different geosynthetics and fillers. The instrument improves the size of test box, facilitates the comparative analysis of the two tests, and has an image recording system which enables the microscopic analysis of test process. The direct shear and pull-out tests of geosynthetics(geogrid and geotextile) reinforced tailings sand were carried out with the newly developed apparatus. The results show that the interface parameters(pseudo-cohesion and pseudo …
Application Of Far And Near Trace Attributes For Avo Analysis In Deep Water Area In Qiongdongnan Basin, Liu Shiyou, Zhang Yingzhao, Li Yangsen, Yan Anju, Zhang Haiyang
Application Of Far And Near Trace Attributes For Avo Analysis In Deep Water Area In Qiongdongnan Basin, Liu Shiyou, Zhang Yingzhao, Li Yangsen, Yan Anju, Zhang Haiyang
Coal Geology & Exploration
For prestack seismic data with low signal-to-noise ratio(SNR), the effect of traditional AVO rendezvous analysis and intercept gradient product attribute(P×G attribute) may not be ideal. In order to extract the information of AVO attribute effectively, this paper starts from the prestack partial superposition body, according to the relative relation of the far and near track part superposition body, the far and near attribute factor similar to the P×G attribute was constructed, in which the near track stack reflects the intercept attribute, and the near-far stack difference reflects the intercept attribute, which is similar to the …
Forward Response Analysis Of Shield Advanced Detection With Moving Array Electrode, Zhao Shuanfeng, Bai Yunrui, Huang Tao, Wei Mingle
Forward Response Analysis Of Shield Advanced Detection With Moving Array Electrode, Zhao Shuanfeng, Bai Yunrui, Huang Tao, Wei Mingle
Coal Geology & Exploration
Aiming at problems of serious electromagnetic interference, difficult application in TBM(Tunnel Boring Machine) tunnel construction and so on, a method of shield advanced detection based on moving array electrodes is adopted. Using Comsol Multiphysics finite element simulation software to establish geoelectric model, forward response analysis is carried out for various geological conditions. The results show that adding the protective electrodes can obviously enlarge the voltage distribution range, which means the detection range increases. In order to improve the detection effect, it is necessary to add protective electrodes. Changes in the size, shape and position of the anomalous body will exhibit …
Frequency Dispersion Mechanism Of Complex Resistivity Of Coal, Guo Yuehui, Zhang Yugui, Li Jian, Zhou Meng
Frequency Dispersion Mechanism Of Complex Resistivity Of Coal, Guo Yuehui, Zhang Yugui, Li Jian, Zhou Meng
Coal Geology & Exploration
In order to study the physical mechanism of frequency dispersion of complex resistivity of coal at 0-200 kHz, the amplitude-frequency and phase-frequency of complex resistivity of coal are measured under variable frequency of constant current. Using the Fourier inverse transform to convert the frequency domain data of complex resistivity of coal into time domain data; Using the Cole-Cole model, the complex resistivity dispersion data are fitted; Drawing on the electric double layer deformation hypothesis theory, the dispersion mechanism of complex resistivity of coal is studied by comparing the frequency dispersion of sandstone. The results show that in the current frequency …
The Key Technology For Drilling Horizontal Well In Coal Seam Roof In Qianbei Mining Area, Hu Xinpeng, Zhao Yongzhe, Xu Kanshe, Wang Linjie, Li Peng, Duan Huijun
The Key Technology For Drilling Horizontal Well In Coal Seam Roof In Qianbei Mining Area, Hu Xinpeng, Zhao Yongzhe, Xu Kanshe, Wang Linjie, Li Peng, Duan Huijun
Coal Geology & Exploration
primary ways to develop the soft coal seam CBM. Aiming at the complex geological conditions and reservoir conditions in Qianbei mining area of Guizhou Province, in order to solve the problems of horizontal well leakage, well trajectory control and solid completion in the horizontal well drilling of coal seam roof, the key technology of horizontal well drilling of coal seam roof in Qianbei mining area, with the accurate control of trajectory as the core, and the technology of preventing leakage, eccentricity and solid completion are combined. Combined with on-site drilling practice, the problems of difficulties in horizontal well drilling were …
Senior Project Scientist George Hagerman Discusses Wind Turbines On Coast Live, News @ Odu
Senior Project Scientist George Hagerman Discusses Wind Turbines On Coast Live, News @ Odu
News Items
No abstract provided.
Dual-Axis Solar Tracker, Bryan Kennedy
Dual-Axis Solar Tracker, Bryan Kennedy
All Undergraduate Projects
Renewable energies, and fuels that are not fossil fuel-based, are one of the prolific topics of debate in modern society. With climate change now becoming a primary focus for scientists and innovators of today, one of the areas for the largest amount of potential and growth is that of the capturing and utilization of Solar Energy. This method involves using a mechanical system to track the progression of the sun as it traverses the sky throughout the day. A dual-axis solar tracker such as the one designed and built for this project, can follow the sun both azimuthally and in …
Computational Assessment Of Aortic Valve Function And Mechanics Under Hypertension, Saurav Kadel
Computational Assessment Of Aortic Valve Function And Mechanics Under Hypertension, Saurav Kadel
Browse all Theses and Dissertations
Calcific aortic valve disease (CAVD), the most common valvular heart disorder, is associated with complications such as stroke, heart attack, aortic aneurysm, left ventricular hypertrophy, and ultimately death. While hypertension has been identified as a major risk factor for CAVD, the mechanisms by which it may promote calcification are still unknown. Given the sensitivity of valvular tissue to mechanical stress alterations, the hemodynamic abnormalities linked to hypertension may play a role in the development of CAVD. Further, the effects of hypertension on the left ventricular functionality and coronary flow resistance remain largely uninvestigated. Hence, the objectives of this thesis were …