Digital Commons Network^™

A Calculational Model For 3d Fault Complexity Based On Curvature Analysis And Fractal Dimensions, Yan Junsheng, Liu Zaibin, Fan Tao, Yang Hui, Liu Wenming, Du Wengang, An Lin, Liu Chenguang, Wang Xiaohui

Coal Geology & Exploration

Objective and Methods Faults are identified as one of the most threatening geological structural factors among hidden disaster-causing factors in coal mines. However, the 3D quantitative assessment of them remains challenging. Considering that existing quantitative indicators fail to fully reflect fault morphologies and there is a lack of 3D methods, this study proposed a calculational model for 3D fault complexity based on curvature analysis and fractal dimensions. This model improved the morphologies of traditional measurement volumes of fractal dimensions by employing the Delaunay tetrahedralization algorithm, thus effectively reducing the invalid values in calculating the 3D fractal dimensions of faults. Moreover, …

Exploration Of The Impacts Of Cement Sheath On Casing Stress Based On The Arching Effects Of Formations, An Fengchen, Miao Zhibo, Meng Siwei, Wei Ziying, Zhang Xiao, Zeng Jiaming, Wang Xiaohua

Coal Geology & Exploration

Objective With the growth in the demand for natural oil and gas and the technological progress of their production, the oil and gas well depths have been constantly setting new records. The increase in the depth corresponds to sharply increasing in-situ stress, leading to increasingly severe damage to the casing of ultradeep oil and gas wells. To enhance the bearing capacity of the casing under high in-situ stress, high-strength casing with a large wall thickness is typically employed, a measure which has been proved, however, less effective. Methods This study established a finite element model of the casing-cement sheath-formation system …

Hydrochemical Characteristics And Component Sources Of Water In Underground Reservoirs In The Daliuta Coal Mine, Zhang Haitao, Jiang Binbin, Zhang Haiqin, Li Peng, Wu Min, Hao Jingwei, Hu Yutian

Coal Geology & Exploration

Objective Underground reservoirs in coal mines are capable of storing and purifying mine water. A deep understanding of the hydrochemical characteristics and formation mechanisms of water in underground reservoirs is identified as an important prerequisite for large-scale development of technologies for mine water treatment. Methods This study investigated the underground reservoirs in the Daliuta Coal Mine within the Shendong area by testing and analyzing their influent and effluent water samples. Using methods such as the ion ratio method, multivariate statistical analyses (e.g., correlation analysis and principal component analysis (PCA)), and the positive matrix factorization (PMF) model, this study delved into …

Artificial Intelligence In Fetal And Pediatric Echocardiography, Alan Wang, Tam T Doan, Charitha Reddy, Pei-Ni Jone

Faculty, Staff and Students Publications

Echocardiography is the main modality in diagnosing acquired and congenital heart disease (CHD) in fetal and pediatric patients. However, operator variability, complex image interpretation, and lack of experienced sonographers and cardiologists in certain regions are the main limitations existing in fetal and pediatric echocardiography. Advances in artificial intelligence (AI), including machine learning (ML) and deep learning (DL), offer significant potential to overcome these challenges by automating image acquisition, image segmentation, CHD detection, and measurements. Despite these promising advancements, challenges such as small number of datasets, algorithm transparency, physician comfort with AI, and accessibility must be addressed to fully integrate AI …

Mechanisms And Influential Factors Of Rock Bursts In Tunneling Roadways Of Extra-Thick Coal Seams, Peng Yujie, Wang Qiang, Cao Anye, Xue Chengchun, Lyu Guowei, Hao Qi, Liu Yaoqi, Bai Xianxi, Li Dong

Coal Geology & Exploration

Objective Rock bursts occur frequently in tunneling roadways of extra-thick coal seams, significantly constraining safe coal mining. Investigating their mechanisms and influential factors is crucial to preventing and controlling such disasters in tunneling roadways of extra-thick coal seams. Methods Focusing on the tunneling roadway of mining face 250107-1 for an extra-thick coal seam within a coal mine in Gansu Province, this study established the discriminant indices for rock burst-induced roadway instability. By simulating the energy distribution patterns of surrounding rocks in the tunneling roadway using the FLAC^3D software, this study revealed the zonal energy characteristics of the surrounding rocks …

Coal Gasification Through Microbial Degradation In A Low-Pressure Co2 And H2 Environment: An Experimental Study, Jian Kuo, Fu Xuehai, Liu Mingjie, Liu Jian, Li Jin, Ru Zhongliang, Ji Xiaofeng, Wang Qiang

Coal Geology & Exploration

Objective and Methods This study aims to investigate the characteristics of CO₂ biomethanation and coal gasification through microbial degradation in a low-pressure environment. With low-rank bituminous coals (R_max = 0.67%) as fermentable substrates, this study conducted a 96-day gas production experiment through microbial fermentation in a low-pressure CO₂ and H₂ environment. Using techniques including gas chromatography, 16S rRNA gene sequencing, and low-temperature liquid nitrogen adsorption, this study delved into the intrinsic variation patterns of biogenic gas production, microbial communities, and coal structures. Results and Conclusions The results indicate that compared to conventional fermentation, the injection …

Application Of D-Insar In Monitoring The Impacts Of Shaft Grouting On Surface And Building Deformations, Liu Hui, Lu Rumeng, Su Lijuan, Cheng Shiguang, Zhang Pengfei, Cheng Hua

Coal Geology & Exploration

Objective In coal mining engineering, damaged well walls pose a threat to the safety of production facilities and mines. Comprehensively monitoring the impacts of shaft grouting on the deformations of mine surface plants and surface buildings is critical for ensuring the safe production of mines. Methods This study investigated a coal mine in the mining area within northern Anhui Province. Using the 15 scenes of Sentinel-1A image data covering the coal mine and the differential interferometric synthetic aperture radar (D-InSAR) technology, this study comprehensively monitored the subsidence of mine surface plants and surface buildings before and after shaft grouting, obtaining …

Fracture Structure Of The Overburden In The Layered Mining Of Extremely Thick Coal Seams: Developmental Patterns Of Caving Zones And Hydraulically Conductive Fracture Zones And Fracture Characteristics, Zhang Xin, Chen Youkuo, Meng Hailun, Qin Qifa, Cheng Xianggang, Huang Rongjie, Dong Hairui, Sun Wenbin, Qiao Wei

Coal Geology & Exploration

Objective The Zhunnan Coalfield, a coalfield on the southern margin of the Junggar Basin in Xinjiang, boasts abundant coal resources. However, water hazards in mines severely constrain the safe and efficient coal production in the coalfield. Since hydraulically conductive fractures in roofs serve as primary hydraulically conductive channels formed in the mining of the mining face, it is particularly crucial to investigate the developmental patterns of these fractures during the layered mining of extremely thick coal seams. Methods This study explored the (9-15)08 mining face of the Liuhuanggou Coal Mine in Xinjiang. Using ground exploration holes and borehole televiewers, this …

An Integrated Ecosystem Monitoring Technology For Coal Mining Subsidence Areas And Its Application In The Shendong Mining Area, Cheng Yang, Liu Wei, Zhang Na, Li Guanjie, Liu Kai, Zhang Chengye, Li Jun

Coal Geology & Exploration

Background The ecosystem monitoring of arid and semi-arid coal mining subsidence areas acts as a significant prerequisite for regional ecosystem conservation and management, holding critical significance for accelerating green mine construction. Methods Based on the Chinese government's regulatory requirements for mine ecosystems, this study analyzed the difficulties in ecosystem monitoring in the coal mining subsidence area of the Shendong mining area (also referred to as the Shendong coal mining subsidence area). By detailing the integrated coal-rock-water-soil-air-vegetation-carbon monitoring technology system, this study determined the factors, principal methods, and technology roadmap for the integrated ecosystem monitoring in the Shendong coal mining subsidence …

Predicted Water Yield Of Open-Pit Metal Mines Based On A Bi-Rnn And Gms Coupling Model, Zhao Yuxing, Li Xiangwen

Coal Geology & Exploration

Objective Accurately predicting water yield of mine before mining can provide directive guidance for preventing potential water hazards and ensuring safe production. Methods To enhance the prediction accuracy and stability of water yield of open-pit metal mines, for which atmospheric precipitation acts as the primary recharge source of water, this study developed a prediction model that coupled a bidirectional recurrent neural network (Bi-RNN) and the Groundwater Modeling System (GMS) software. Specifically, based on historical forecasted precipitation data provided by the Global Forecast System (GFS), the fluctuation pattern of differences between predicted forecasted and actual precipitation was analyzed. After being corrected …

An Experimental Study Of The Application Of The Spectral Acoustic Method To The Advance Detection Of Geologic Structures In Tunnelling Working Site, Zhang Jianguo, Feng Zhicheng, Wei Fengqing, Ma Ji, Zhao Kai, Wang Man, Guo Minggong, Шилов Владимир Иванович

Coal Geology & Exploration

Objective The practice of coal mine production has proved that the vast majority of coal and gas outbursts are controlled by geological structures, and mainly occur in tunnelling working site. Therefore, continuous advanced detection of geological structures is an important technical means to prevent and control coal and gas outbursts in tunnelling working site, and is of great significance to ensure safe production in mines. Methods Based on the research results of spectral acoustic method in Russia for many years, the resonance phenomenon generated at the weakened contact surface of the roof rock layer by the artificial acoustic signal excited …

Application Of Microseismic Monitoring In The Optimization Of Control Strategy For Roofs Composed Of Composite Hard Sandstone Masses, Zhang Yin, Li Jiajun, Zhao Qian, Yang Chenchen, Liu Jiaqi, Zhou Yu

Coal Geology & Exploration

Objective With a gradual increase in the coal mining depth in China, the movement of overlying thick and hard rock layers exerts increasingly complex impacts on the mine pressure. Methods In the Ordos area, the overburden of the mining face of most mines hosts composite hard sandstone masses, serving as key layers characterized by considerable thicknesses, high hardness, and close proximity. Results and Conclusions As a result, the risks of mine earthquakes and dynamic manifestation co-exist in the mining face. With the roof of mining face11-3106 in a coal mine within the Ordos mining area as the engineering background, this …

Spatiotemporal Response Characteristics Of Transient Electromagnetic Field In Water-Bearing Goaves And Their Applications, Song Guilei, Gong Xufei, Yang Fuqiang, Cui Jianting, Li Zhanling, Liu Lina

Coal Geology & Exploration

Objective and Methods This study aims to enhance the accuracy of the mine transient electromagnetic method (MTEM) in of imaging of water-bearing goaves. Based on the geological conditions of the Gaojialiang Coal Mine, this study simulated the spatiotemporal response characteristics of the induced magnetic field in the water-bearing goaf model under varying stratigraphic spacings using finite element software COMSOL. Accordingly, this study analyzed the distribution patterns of the induced magnetic field on the apparent resistivity pseudosections and the plots of the differentials of longitudinal apparent conductivity. Using the results, the water-bearing conditions of goaves in the Ordos Gaojialiang Coal Mine …

Biomimetic Technologies For Drill Rods: Advances In Research And Development Trends, Wang Chuanliu, Ju Pei

Coal Geology & Exploration

Significance Drill rods are recognized as core tools in drilling engineering, and their performance exerts a significant influence on drilling efficiency and safety. Over recent years, applying biomimetic technologies to drill rod design has gradually emerged as a hot research topic. By imitating the remarkable structures, morphologies, and material properties of living organisms in nature, biomimetic technologies provide entirely new philosophies and approaches for the innovative design of drill rods. Advances This study summarizes the advances in research on biomimetic technologies for drill rods in terms of the biomimetic design of structures, morphologies, and materials. Regarding the biomimetic design of …

A Dc-Unet-Based Image Processing Method For Detecting Fractures Along Roadway Sections Of Coal Mines, Dong Zheng, Zhang Xuhui, Yang Wenjuan, Kang Le, Tang Duwei, Tian Chenhui

Coal Geology & Exploration

Objective Detecting fractures along roadway sections of coal mines allows for the characterization of the geologic conditions of roadways, thus providing guidance for roadway tunneling and support engineering. However, conventional image processing methods for fractures along roadway sections are susceptible to complex environments in underground coal mines, exhibiting a low fracture detection efficiency. Methods This study proposed a novel image processing method for detecting fractures along roadway sections based on a DC-UNet model. This method can be deployed on a mobile terminal and an embedded device, thereby allowing for real-time and effective detection of fractures along roadway sections and enhancing …

Development Of A Power Recovery-Based Dynamic Loading System For Full-Size Drill Rods In Coal Mines, Zhang Jing, Wang Jie

Coal Geology & Exploration

Objective This study aims to simulate the actual forces applied to drill rods during the borehole drilling for gas drainage from underground coal mines to satisfy the requirements of drill rods’ fatigue tests. Methods This study designed a dynamic loading system for full-size drill rods in coal mines. This system consists of a drill rod loading platform, a hydraulic pump unit with power recovery, and a measurement and control system, allowing for the composite loading of dynamic torque, axial force, and radial displacement on drill rods of different specifications. In this system, torque is loaded to drill rods using the …

Impact Of American Thyroid Association's Revised Cancer Management Guidelines On Thyroid Cancer Incidence Trends: A Retrospective Cohort Study, 2000-2020, Pierre Fwelo, Natalia I Heredia, Ruosha Li, Ayrton Bangolo, Vignesh K Nagesh, Simcha Weissman, Xianglin L Du

Faculty, Staff and Student Publications

Background: The past four decades have seen a steady increase in thyroid cancer in the United States (US). This study investigated the impact of the American Thyroid Association (ATA)'s revised cancer management guidelines on thyroid cancer incidence trends and how the trends varied by socioeconomic, histologic, geographic, and racial and ethnic characteristics from 2000 to 2020.

Methods: We used data from the Surveillance, Epidemiology, and End Results (SEER) database to identify thyroid cancer cases diagnosed among US patients between 2000 and 2020. We employed joinpoint regression software to fit, assess, and compare thyroid cancer incidence trends over time stratified by …

Non-Plus Ultra Ideologies In Multilingual Teacher Education Research: Towards Real Inclusion, David Martinez-Prieto, Xiaodi Zhou

Bilingual and Literacy Studies Faculty Publications

In this duo autoethnography, we reflect on the ideologies prevailing in the United States regarding the use of English as the de facto academic language. In a parallel manner, we analyze the ideologies embedded in the rejection of academic variations in other languages (i.e., Spanish and Mandarin). We collected data from 2016 to 2023 in physical and digital spaces while interacting with U.S. academia. To analyze our experiences, we used a framework that combined critical literacies and language ideologies. We found the rejection of non-English academic domains related to structural and epistemological ideologies present in some U.S. institutions and among …

Less Is More: Evaluating The Benefits Of Minimally Invasive Spinal Surgery, Ali Ahmed Mohamed, Rakan Alshaibi, Steven Faragalla, Garrett Flynn, Asad Khan, Emma Sargent, Youssef Mohamed, Camberly Moriconi, Cooper Williams, Zev Karve, Daniel Colome, Phillip Mitchell Johansen, Brandon Lucke-Wold

Student Publications

This review aims to explore the evolution, techniques, and outcomes of minimally invasive spine surgery (MISS) within the field of neurosurgery. We sought to address the increasing burden of spine degeneration in a rapidly aging population and the need for optimizing surgical management. This review explores various techniques in MISS, drawing upon evidence from retrospective studies, case series, systematic reviews, and technological advancements in neurosurgical spine treatment. Various approaches, including endonasal cervical, transoral cervical, transcervical, mini-open/percutaneous, tubular, and endoscopic techniques, provide alternatives for current approaches to a range of spinal pathologies. The main findings of this review highlight potential advantages …

High Peripheral T Cell Diversity Is Associated With Lower Risk Of Toxicity And Superior Response To Dual Immune Checkpoint Inhibitor Therapy In Patients With Metastatic Nsclc, Mehmet Altan, Ruoxing Li, Ziyi Li, Runzhe Chen, Ajay Sheshadri, Hai T Tran, Latasha Little, Joshua Baguley, Jefferson Sinson, Natalie Vokes, Saumil Gandhi, Mara B Antonoff, Stephen G Swisher, Greg Lizee, Alexandre Reuben, John V Heymach, Jianjun Zhang

Faculty, Staff and Student Publications

INTRODUCTION: Despite significant successes, immune checkpoint blockade fails to achieve clinical responses in a significant proportion of patients, predictive markers for responses are imperfect and immune-related adverse events (irAEs) are unpredictable. We used T-cell receptor (TCR) sequencing to systematically analyze prospectively collected patient blood samples from a randomized clinical trial of dual immune checkpoint inhibitor therapy to evaluate changes in the T-cell repertoire and their association with response and irAEs.

METHODS: Patients with immunotherapy-naïve metastatic non-small cell lung cancer (NSCLC) were treated with ipilimumab and nivolumab according to trial protocol (LONESTAR, NCT03391869). Blood samples were systematically obtained at baseline (n=107), …

Introduction To Song’S “Persuasion Vs. Coercion Or Persuasion And Coercion”, Larry C. Spears

International Journal of Servant-Leadership

I am happy to have been invited to add some brief introductory comments to the wonderful paper by Jiying Song and the essay by Robert K. Greenleaf which is included. To start, Song’s paper is a powerful engagement of Robert K. Greenleaf’s essay, “Overcome Evil with Good,” which appeared in the May 15, 1977 edition of Friends Journal. While Greenleaf addressed in several of his writings the themes of persuasion, manipulation, and coercion, and contrasted Mahatma Gandhi’s and John Woolman’s approaches to change, nowhere did he do so as fully and passionately as he did in the original Friends Journal …

Servant-Leadership: Forgiving Others In The Restoration Of Community, Ryan Schmidt, Kelly (Sasha) Dailey

International Journal of Servant-Leadership

Servant-Leadership, Feminism, and Gender Well-Being (Song et al., 2022) serves as a source of inspiration and hope when engaging with the complexities of the modern world, one marked by a growing division between people and an increased entrenchment of ideals. In looking to servant-leadership as a guide for navigating the emotional and deeply personal rhetoric pervading public forums, learnings can be found beyond the established dominant-group ideologies and mainstream reasonings. The purpose of this article is to explore how servant-leadership, an emerging leadership theory that acknowledges one’s natural feeling to serve others’ highest priority needs (Greenleaf 1977/2002), can provide a …

An Examination Of Followers’ Motivation To Serve As An Antecedent Of Servant-Leadership In Uk Organisations, Ijeoma G. Ukeni

International Journal of Servant-Leadership

Motivation to serve is conceptualised as an antecedent of servant-leadership but is mostly studied from the leaders’ perspective. Yet, as in any dyadic relationship, exploring the followers’ perspective is crucial, particularly as servant-leadership is an acclaimed follower-centric leadership theory. Hence, this quantitative study is a departure from the norm with a focus on the followers’ motivation to serve (MTS). Premised on the social learning theory, data was collected from 208 respondents in UK private and public organisations using existing and adapted questionnaire surveys that were statistically analysed. The results show a correlation between motivation to serve and servant-leadership but suggest …

Servant-Leadership: A Forgiveness-Based Approach To Medical Errors, Complications, And Bad Outcomes, Wade C. Johnson

International Journal of Servant-Leadership

In the United States, medical errors, clinical complications and bad outcomes are often managed through a medical-legal system that seeks retributive justice, costing billions of dollars, and leaving patients and healthcare providers with deep emotional wounds and fractured relationships. In contrast, a forgiveness-based approach through Servant-leadership offers patients and medical providers a holistic and restorative justice that acknowledges shared suffering, addresses intrinsic needs, and rebuilds the sacred sense of community once shared between the two groups. This paper explores the benefits of a Servant-leadership forgiveness-based approach to medical errors, clinical complications, and bad outcomes, including its positive impact on patients, …

Multiparametric Cardiovascular Magnetic Resonance Is Associated With Outcomes In Pediatric Heart Transplant Recipients, Andrew A Lawson, Kae Watanabe, Lindsay Griffin, Christina Laternser, Michael Markl, Cynthia K Rigsby, Joshua D Robinson, Nazia Husain

Faculty, Staff and Students Publications

BACKGROUND: Multiparametric cardiovascular magnetic resonance (CMR) has an emerging role in non-invasive surveillance of pediatric heart transplant recipients (PHTR). Higher myocardial T2, higher extracellular volume fraction (ECV), and late gadolinium enhancement (LGE) have been associated with adverse clinical outcomes in adult heart transplant recipients. The purpose of this study was to investigate the prognostic value of CMR-derived T1 and T2 mapping, ECV, and LGE for clinical outcomes in PHTR.

METHODS: We performed a single-center, retrospective chart review of consecutive, gadolinium-enhanced CMR studies in PHTR over a 7.5-year period, excluding follow-up studies. Standard CMR ventricular volume and function analysis, T1 mapping …

Diagnosis And Treatment Of Crop Inflammation Of Rough-Legged Buzzard (Buteo Lagopus) In Daqing Wildlife Nature Reserve, Heilongjiang Province, China, Wang Zheng, Ding Ruxin, Ge Yansong, Xu Enshuang, Zheng Jiasan

The Thai Journal of Veterinary Medicine

This article describes a Rough-legged Buzzard (Buteo lagopus) from the Wildlife Nature Reserve in Daqing, China. According to the staff of Daqing Wildlife Nature Reserve, the Rough-legged Buzzard was found to have impaired flight ability, depression, and loss of aggression, but its feathers were full and there were no obvious external injuries, so it was sent to the Wildlife Rehabilitation Center of the Teaching Animal Hospital of Heilongjiang Bayi Agricultural University for treatment. After the vet conducted X-ray and blood tests, he diagnosed the bird with a foreign body in the crop and crop inflammation. He finally treated …

Hematology, Blood Biochemistry And Cytochemical Characteristics Of Blood Cells Of Captive Aldabra Giant Tortoise (Aldabrachelys Gigantea) In Thailand, Thanida Haetrakul, Nitiwadee Keschumras, Sirawich Srisiri, Narinthip Chaiyanont, Nisama Wongnitipat, Phatcharaporn Phuasombatcharoen, Praewa Sirichitr, Nantarika Chansue

The Thai Journal of Veterinary Medicine

Aldabra giant tortoises (Aldabrachelys gigantea), well-known pet tortoises worldwide, were classified as Appendix II by The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). This study aims to investigate the hematological, blood biochemical, and cytochemical characteristics of blood cells in healthy Aldabra giant tortoises in captivity. Blood samples were collected from the dorsal tail vein of 12 tortoises (6 males and 6 females) during May and October 2022. The hematological values showed no statistically significant differences between male and female tortoises. However, in female tortoises, calcium and phosphorus levels were significantly higher than …

The Effects Of Propofol On Doppler Echocardiographic Values Of The Aorta, Main Pulmonary Artery, And Mitral E Wave In New Zealand White Rabbits, Mehmet Alper Çetinkaya, Mahir Kaya

The Thai Journal of Veterinary Medicine

The aim of this study was to determine the effects of propofol on acceleration time (AT), ejection time (ET), AT / ET ratio obtained from the aorta (Ao) and main pulmonary artery (MPA) and Doppler echocardiographic values of mitral E wave (E) in New Zealand white rabbits. Echocardiographic evaluation was performed in 40 conscious rabbits and repeated after propofol administration. The baseline mean values were 0.028±0.006 second (s) for Ao-AT, 0.116±0.017 s for Ao-ET, 0.24±0.036 for Ao-AT / ET, 0.05±0.01 s for MPA- AT, 0.137±0.018 s for MPA-ET, 0.38±0.037 s for MPA-AT/ET, 84.13±18.26 cm/s for E peak velocity, 3.06±1.38 mmHg …

Electoral College Subversion, The Vice President & The Federal Writ Of Mandamus, Benjamin Sevart

Tennessee Journal of Law and Policy

No abstract provided.

Front Matter Fall 2024

Tennessee Journal of Law and Policy

No abstract provided.