Digital Commons Network^™

Numerical Simulations And Dispersion Analysis Of 3d In-Seam Waves Based On Finite Difference Method On Curvilinear Grids, Liu Dan, Ren Zhiming

Coal Geology & Exploration

Background With the comprehensive advancement in intelligent coal mine construction, creating high-precision, transparent geological models of coal seams and their surrounding strata has emerged as a prerequisite for intelligent coal mining. The accurate identification of concealed geological anomalies, such as folds and faults, within coal seams represents a key challenge in safe coal mining. In-seam seismic exploration has become an important approach to detecting underground concealed structures owing to its advantages, including a considerable detection distance along coal seams, high precision, pronounced frequency dispersion effects, and facilitating the identification of waveform signatures. However, conventional methods for seam wave simulation are …

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

Enhanced Adaptive Smith Predictor Control For Underground Coal Gasification With Long Time Delays, Tang Yang, Wu Qiong, Zhang Lei, Zhou Mingjun, Wan Min, Liao Zhuodong

Coal Geology & Exploration

Background Underground coal gasification (UCG) represents an in situ conversion technology used to convert solid coals into gaseous fuel. However, the reaction process during UCG exhibits significant time delays. Such a limitation will reduce the response capability of the UCG system and is prone to induce overshoot and oscillation, thereby increasing the system’s control difficulty and reducing its stability and dynamic performance. Method To address these issues, this study proposed an enhanced Smith predictor control algorithm based on a genetic algorithm and established a semi-physical experimental platform integrating a physical distributed control system DCS-Matlab for modeling. Using the platform, experiments …

Discovery And Implications For Ore Prospecting Of Gravitational Gliding Structures In The Lutang Coal-Based Graphite Mining Area, Hunan Province, China, Xiao Jincheng, Lu Jiang, Liu Zhiyu, Zhu Linying, Xiao Haibin, Li Long, Xiao Jing

Coal Geology & Exploration

Background Data from previous exploration and studies indicate that the Lutang coal-based graphite mining area in Hunan Province falls within the Lutang-Shatian synclinorium in terms of tectonic location, with coal-bearing strata dominated by the upper member of the Upper Permian Longtan Formation. Influenced by the intrusion of granites, coal seams adjacent to the Qitianling pluton on the eastern flank of the mining area have undergone contact metamorphism, forming coal-based graphite. Previous exploration results suggest that the Qitianling pluton has a maximum burial depth measured at an elevation of 0 m or less. However, with constant underground exposure in mines, previous …

Comparison Of Log-Based Coal Structure Identification Methods For Structurally Complex Areas: A Case Study Of The Huainan Mining Area, Zhang Zixin, Zhou Xiaozhi, Chen Xuehua

Coal Geology & Exploration

Objective CO₂ displacing coalbed methane (CBM) provides substantial environmental and energy benefits. However, differences in coal structures represent a key geological factor influencing the effectiveness of this technique. Constrained by the complex geological conditions for CBM occurrence and the impacts of multiple factors on the log responses of coal structures, traditional log-based methods for coal structure identification face challenges such as much human intervention, complex feature engineering, and poor adaptability. This study aims to achieve effective identification of complex coal structures within a single coal seam. Methods An asymmetric convolution kernel-based convolutional neural network (CNN) model for coal structure …

Heterogeneity And Its Controlling Effect On Coalbed Methane Productivity For Deep Coal Reservoirs In The Northern Part Of The Eastern Margin Of The Ordos Basin, Xi Zhaodong, Tang Shuheng, Wu Jian, Zhang Songhang, Zhao Hang, Chen Jiang, Li Yanfei

Coal Geology & Exploration

Objective With the continuous advancement in the exploration and exploitation of coalbed methane (CBM), the focus of research and practices is gradually shifting from shallow to deep parts. Deep CBM, an important unconventional natural gas resource, has become a strategic replacement to ensure energy security and prompt industrial development in China. However, deep coal reservoirs exhibit strong heterogeneities, posing a core geological challenge to their efficient exploration and development. Methods This study investigated the deep No. 8 coal seam in the northern part of the eastern margin of the Ordos Basin. By integrating multiple technical methods, including geostatistics, spatial interpolation, …

Helium Origin And Primary Factors Controlling Helium Enrichment For Bauxite Gas Reservoirs In The Longdong Area, Ordos Basin, Chen Keyu, Wang Xiaofeng, Liu Wenhui, Zhang Dongdong, Li Xiaofu

Coal Geology & Exploration

Objective Significant breakthroughs have been achieved in the exploration of bauxite gas reservoirs in the Taiyuan Formation, Longdong area, Ordos Basin. Bauxites are generally considered to hold great helium generation potential due to their relatively high uranium (U) and thorium (Th) contents. However, there remains a lack of quantitative studies on their actual contribution to helium abundance in natural gas in the area. Methods To determine dominant helium source rocks and mechanisms behind helium enrichment, this study investigated the bauxite gas reservoirs within the Taiyuan Formation in the Longdong area. Through analyses of the composition, carbon isotopes, and noble gas …

Damage And Fracture Field Evolution In The Overburden Of An Extremely Thick Coal Seam Under Multi-Layered Fully Mechanized Top-Coal Caving Mining, Zhang Cun, Fan Baiqiang, Ren Yiming, Zhao Ruihang, Peng Baoshan, Pan Weidong, Liu Shiqi

Coal Geology & Exploration

Objective Multi-layered fully mechanized top-coal caving mining represents a primary method for exploiting extremely thick coal seams. Quantitatively characterizing the damage patterns and fracture field evolution characteristics of the overburden in stopes subjected to high-intensity layered mining is critical to the safe production of coal mines. Methods The extremely thick B1 coal seam (average thickness: 53.59 m) in the No. 2 mine of the Dajing mining area in the Zhundong coalfield was selected as the engineering background. By integrating physical simulation using similar materials and numerical simulation, this study revealed the geometric and fractal characteristics of damage to the overburden …

Triaxial Shear Test-Derived Strength Model Of Deeply Buried Frozen Calcareous Clay Incorporating The Effect Of Unfrozen Water Content, Xing Lezhang, Rong Chuanxin, Chang Lei, Wang Bin, Deng Jiyuan

Coal Geology & Exploration

Background The Huanghuai mining area represents an important coal base in eastern China. However, the Cenozoic calcareous clay in the area exhibits high plasticity, low permeability, and potential expansion and deformation during freezing, leading to unstable freezing performance. Consequently, artificial ground freezing (AGF) in the area generally faces a risk of cost surge or out of control due to the excessive thickness or limited strength of frozen walls.Methods This study investigated calcareous clay remolded based on soil samples from the Huanghuai mining area. Using a low-field nuclear magnetic resonance (LF-NMR) spectrometer and a high-pressure triaxial system, this study systematically …

Bp-Kan-Based Inversion Imaging For Borehole Resistivity Method And Its Application, Xu Zhongzhong, Yin Longlong, Cheng Jiulong, Xu Jinpeng, Lu Cunjin, Zhao Hongpeng

Coal Geology & Exploration

Objective In the monitoring of coal seam mining-induced deformation and failure of surrounding rocks, the borehole resistivity method stands out due to its capacity for dynamic, three-dimensional (3D) full-space measurements. However, conventional resistivity inversion for the method is generally carried out using the least squares algorithm, leading to limited accuracy in practical engineering. In recent years, neural network-based inversion has demonstrated the potential for addressing this challenge, while its performance is yet to be further improved. Methods In this context, inversion imaging based on a back propagation-Kolmogorov-Arnold network (BP-KAN) was proposed for the borehole resistivity method, aiming to accurately monitor …

Design Of An Intelligent Failure Diagnosis And Early Warning System For Tunnel Drilling Rigs In Coal Mines, Song Haitao, Zhang Naiwen, Han Jian, Wu Min

Coal Geology & Exploration

Objective In coal mines, harsh environments and complex geological conditions underground lead to frequent failures of tunnel drilling rigs. However, conventional techniques for failure diagnosis and early warning suffer from limitations in diagnostic accuracy, real-time performance, and interpretability. Therefore, these techniques are insufficient for both the rapid identification of the anomalous status of tunnel drilling rigs and the early warning of their potential failures. Methods Considering the complex underground environments in coal mines, this study developed an intelligent failure diagnosis and early warning system for tunnel drilling rigs in coal mines, placing a particular emphasis on key technologies for failure …

A Method For Optimizing The Digital Twin Model Of The Mechanical-Electro-Hydraulic System Of Cantilever Tunnel Boring Machines, Wang Yan, Jia Zeyu, Zhao Yihui, Wei Shirui, Zhang Xuhui, Zhao Youjun, Han Xiao

Coal Geology & Exploration

Objective Cantilever roadheaders represent roadway tunnelling equipment that integrates the deep coupling of mechanical, electrical, and hydraulic systems, and their control accuracy directly determines the forming quality of roadways.Methods Cantilever roadheaders involve nonlinear mechanical motion, hydraulic control, and cutting load, rendering it challenging to establish accurate control models. Using the philosophy of digital twin modeling, this study developed a method for optimizing the digital twin model of the mechanical-electro-hydraulic system of cantilever roadheaders based on virtual-physical consistency evaluation. Specifically, a digital twin model of the mechanical-electro-hydraulic system was developed using multi-domain co-simulation between AMESim and Simulink. This model allows …

Heat Transfer Analysis And Packaging Optimization Design Of Self-Heating Rice, Sun Haowen, Li Huan, Wu Xiaomeng, Mao Like

Food and Machinery

[Objective] To further understand the influence of the heat transfer process on the quality of self-heating foods and improve the heating rate of existing self-heating rice products. [Methods] A combination of virtual simulation and experimental methods was used to analyze the actual temperature variations during the heating process of self-heating rice and the effects of heat transfer on rice texture. A three-dimensional heat transfer model of self-heating rice was established using COMSOL software to investigate the heat transfer process, and the packaging design of self-heating rice was optimized with the objective of maximizing the heating rate. [Results] After reheating and …

Dental Services Access And Oral Health Improvement In Gypsy, Romany And Traveller Communities: A Scoping Review, Martha Paisi, John Rowe, Joelle Booth, Lorna Burns, Janine Doughty, Afsha Musa, Robert Witton

Peninsula Dental School

BackgroundGypsy, Romany, and Traveller (GRT) populations experience poor oral health, with a recognised unmet need for care compounded by multiple barriers to accessing dental services. This scoping review aims to identify and map the available evidence, as well as gaps in the literature, relating to oral health improvement and access to care among GRT populations in Europe.MethodsStudies published in English relating to oral health improvement and/or access to care among GRT populations were included. Electronic databases searched comprised Embase (Ovid), Scopus (Elsevier), Web of Science (Clarivate), and Dentistry and Oral Sciences Source (EBSCOhost). In addition, a grey literature search was …

Normal Tissue Objective Versus Manual Optimizer Rings In Eclipse For Multiple Brain Metastases Radiosurgery, Shelby David

Masters Projects

Purpose

To compare the dosimetric performance of manually generated optimizer rings and the Eclipse Normal Tissue Objective (NTO) for single-isocenter volumetric arc therapy (VMAT) planning of patients with multiple brain metastases treated with stereotactic radiosurgery (SRS).

Methods

A retrospective treatment planning study was performed using ten patients previously treated with SRS for three or more brain metastases. For each patient, three VMAT plans were generated using identical beam geometry. The three plans consisted of manually generated optimizer rings, NTO alone, and a hybrid approach that incorporated both optimization strategies. Plans were evaluated using conformity index (CI), gradient measure (GM), minimum …

Translating Metaphor In Qur'an Into English: Strategies And Challenges, Sultan Samah A Almjlad

Journal of Arabic Sciences and Humanities

Metaphor, or istiʿāra in Arabic, is one of the most prevalent rhetorical devices used in Qur'anic discourse. The Qur'an employed metaphor to convey meanings not immediately apparent on the surface of the text, yet significant. Thus, translating these metaphors into English was extremely difficult due to linguistic and cultural differences. Three well-known English translations of the Qur'an by Ali, Pickthall, and Abdel-Haleem were examined in this study. The study adopted a theoretical approach depending on metaphor translation and Newmark’s conceptual metaphor theory. To achieve its goals, the study was based on 40 Qur'anic verses in Arabic, as only 13 metaphors …

Enhancing Rapid Reef Resilience Through Transplantation Of Thermally Tolerant Corals In OʻAhu, HawaiʻI, Allison M. Klein

Electronic Theses and Dissertations 2020 - Present

Coral reefs are increasingly threatened by marine heatwaves, disease outbreaks, and other anthropogenic stressors, leading to widespread declines in coral cover worldwide. As a result, efforts are increasingly focused on identifying thermally tolerant corals for reef restoration. However, it remains unclear whether thermal tolerance is maintained following transplantation and whether thermally tolerant corals perform differently in novel environments. This dissertation examined thermal tolerance, survivorship, symbiont communities, and growth in two dominant Hawaiian reef-building corals, Montipora capitata and Porites compressa, using a reciprocal transplant experiment between Kāneʻohe Bay and Ulupaʻu, Oʻahu. Initial heat-stress assays showed high thermal tolerance in both …

Determination Of Migration Level Of 4-Methyl- 1-Pentene And 1-Decene From Food Contact Materials Using Headspace-Gas Chromatography, Liu Afang, Chen Ranbing, Li Zheng, Kang Feng, Zhao Jinyao

Food and Machinery

[Objective] This study aims to establish an analytical method for detecting the migration levels of 4-methyl-1-pentene and 1-decene monomers from food contact materials into four food simulants, including 4% acetic acid, 10% ethanol, 20% ethanol, and 50% ethanol. [Methods] Chromatographic columns of different polarities and specifications are compared to select the optimal column. The headspace equilibrium temperature and equilibrium time are optimized using peak area as the evaluation index. Methodological validation is performed by conducting recovery experiments at low, medium, and high spiking levels using the soaking solutions of the negative sample of the four food simulants as the matrix, …

Application Of Slow-Release Plant Essential Oil Preservative Combined With Electron Beam Irradiation In The Preservation Of Shanghai Sand Pears (Pyrus Pyrifolia Nakai ), Yue Ling, Lei Lei, Kong Qiulian, Zheng Qi, Yan Weiqiang

Food and Machinery

[Objective] To investigate the regulatory effects of a composite preservation technology combining slow-release plant essential oil (SPEO) with electron beam irradiation on the storage quality and physiological metabolism of Shanghai sand pears (Pyrus pyrifolia Nakai). [Methods] The fruits of Shanghai sand pear variety 'Cuiguan' are used as test materials. The experiment is conducted with four groups: control, 0.5 kGy electron beam irradiation, SPEO, and 0.5 kGy electron beam irradiation + SPEO. During storage, quality parameters including fruit firmness, weight loss rate, total soluble solids (TSS) content, titratable acid content, and vitamin C (VC) content, as well as physiological metabolism indicators …

Effect Of Lotus Leaf Powder Addition On Whole Wheat Dough Characteristics And Whole Wheat Bread Quality, Chen Rui, Gong Lingxiao

Food and Machinery

[Objective] To determine the optimum addition of lotus leaf powder in whole wheat flour, thus improving the nutritional value of whole wheat bread while maintaining high quality. [Methods] Rapid viscosity analyzer, rheometer, and texture analyzer are employed to explore the pasting properties of the composite flour, the rheological characteristics of the dough, and the texture properties of the bread. Additionally, the effect of lotus leaf powder on the quality of whole wheat bread is evaluated using a colorimeter, sensory evaluation, and in vitro digestion evaluation. [Results] The analysis reveals that as the lotus leaf powder addition is increased, a significant …

Numerical Simulation Of Humidity Field In Baijiu Fermentation Rooms And Influencing Factors, Hao Qi, Shi Yan, Yang Zhengquan, Lin Chunsong, Xu Guangqi, Wen Enhan

Food and Machinery

[Objective] To investigate the effects of ventilation conditions and Daqu stacking methods in the fermentation room on the humidity levels at various points within the room. [Methods] A three-dimensional unsteady gas-solid coupling model of a small-scale fermentation room is established. Then, the humidity field variation patterns in the room are analyzed using the height of the humidifying air supply outlet (H), the interlayer spacing of fermentation racks (h), and the gap between fermentation piles (δ) as variables. Additionally, multi-objective optimization is performed based on response surface methodology (RSM) and the non-dominated sorting genetic algorithm II (NSGA-II). [Results] H, h, and …

Variation In The Use Of Interdentals In The Taif Arabic Dialect: The Impact Of Spatiality And Neighbourhood, Najla M. Alghamdi, Kholoud A. Al-Thubaiti

Journal of Arabic Sciences and Humanities

The variation in the use of plain interdentals (ð)  and (θ ) across Arabic dialects is a significant factor in dialect classification. This study examines the variation in the use of these variants in two Saudi dialects (tribal and non-tribal) within Taif city in the western province of Saudi Arabia. The population of Taif consists of tribal groups that use interdentals and non-tribal groups that use stops. Spatiality (Britain, 2004) and neighbourhood (tribal dominant, non-tribal dominant, and mixed) were examined in relation to interdental and stop usage by both tribal and non-tribal groups. Due to Taif's unique location, which promotes …

Iron-Decorated Graphene Nanoplatelets Produced By Atmospheric-Pressure Ferrocene Pyrolysis As Nano-Additives For Cement Mortars, Harutyun Gyulasaryan, Manoj Chhetri, Karen S. Martirosyan, Nelli Muradyan, Hovsep Hoveyan, Manuk Barseghyan, Aram Manukyan

Physics & Astronomy Faculty Publications

This study examines iron-based graphene nanoplatelets (Fe-GNPs), synthesized through a modified ferrocene pyrolysis route, as hybrid nano-additives for cement mortars. The nanomaterial was characterized by scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller surface area analysis, and thermogravimetric analysis, confirming a graphitic carbon network decorated with crystalline α-Fe nanoparticles. Mortars containing 0.001, 0.01, 0.05, and 0.1 wt.% Fe-GNPs, with and without surfactant-assisted ultrasonication, were tested in flexure and compression after 7 and 28 days of curing. The results showed a clear concentration-dependent response, with 0.01 wt.% yielding the highest strength gains. At 28 days, this dosage increased flexural strength by 14.5% without …

Haunted, Will Travel: “Divided, Fractured, And Barely Legible” The Nightmare-Self In Harrow The Ninth, Atiyana Ringling

Mythcon

My research intends to bring Mark Fisher’s 2012 definition of Hauntology into conversation with the sci-fi journey in Tamsyn Muir’s Harrow the Ninth and its titular character. Using the lens of this Mythcon 54 to focus on the physical and parallel mental journey of Harrow, the physical journey traveled tracks and maps the “lost future” of the world’s inhabitants and questions the extent to which the physical road traveled can mask or hide its destructive inception. “The River” and road traveled in the novel are the result of catastrophic consumption and transformation of the Solar System by the novel's Emperor. …

An Infinite Number Of Roads Diverged In A Wood: Robert Heinlein’S Maximalist Road Trip In The Number Of The Beast, Patrick Julian

Mythcon

Robert Heinlein, Grand Master of Speculative Fiction, was born in Butler, MO (one hour north of Route 66), raised in Kansas City, and lived much of his early adult life in Los Angeles, the westernmost terminus of Route 66. Given this proximity to the Mother Road, it’s no surprise that Heinlein spent a considerable portion of his career writing about various versions of the Road Trip, whether it was taken via foot, horse-drawn carriage, automobile or spaceship. The Roads Must Roll, his 3rd published short story (1940), name checks Route 66, while many of his early works of juvenile …

How To Use Your Mythsoc Membership Online, Megan B. Abrahamson, Alicia Fox-Lenz, Sean Marlow, Grace Moone

Mythcon

Panelists Grace Moone, Sean Marlow, and Alicia Fox-Lenz will give a tutorial on the new Mythopoeic Society membership platform. Now up and running and attached to our website, the new Membershipworks platform allows you to view your membership, getting us off a 30-year-old spreadsheet and into the 21st century! Bring your computer, phone or tablet as the Stewards showcase the uses of the platform and help you with any login issues.

International Student Athletes And The Covid-19 Global Pandemic: Disruption, Uncertainty, And Coping, Isabella M. Franks, Trent A. Petrie, Whitney G. Moore, Carmyn Hayes

Journal of Athlete Development and Experience

COVID-19 and its ripple effects (e.g., social distancing, sport cancellations, quarantining) negatively affected the careers of collegiate student-athletes. The disruption to university systems and collegiate athletics and the stress and uncertainty felt globally likely increased international student-athletes' (ISAs) risk for distress. Yet, ISAs also possessed unique characteristics and were immersed within supportive sport environments, which may have shaped their psychological responses in distinct ways. The COVID-19 pandemic created an opportunity to understand how ISAs, as individuals navigating both athletic and international identities, responded and coped. To date, no study has examined the initial coping experiences of international collegiate athletes, even …

Perceived Safety For Collegiate Student-Athletes: Race, Gender, And Mental Health Outcomes, Macey L. Arnold, Hunter P. Williams, Justin Harker, Heather Kiefer, Julian Yoon, Trent A. Petrie

Journal of Athlete Development and Experience

Inadequate levels of perceived safety on campuses have been reported by college students (e.g., Maffini & Dillard, 2021) and connected to college students' mental health concerns (e.g., sleep disturbances; Etopio et al., 2019). Little is known about student-athletes’ (SA) perceptions of safety, particularly related to their racial and gender identities, and how their perception of safety is related to their mental health. We surveyed 213 SAs regarding their safety perceptions on campus, athletic department, and teams, along with anxiety (GAD-2), depression (PHQ-2), and sleep disturbances (PROMIS-SD). White SAs reported higher levels of safety than Black SAs for all three environments …

Performance, Pressure, And Prescription: A Qualitative Investigation Of Maladaptive Coping In Collegiate Cheerleading, Chris Corr, Taylor Behl

Journal of Athlete Development and Experience

While cheerleading is a staple among athletics competition in the United States, cheerleading has perennially struggled to achieve legitimacy as a competitive and rigorous sport. However, cheerleaders experience similar stressors to those of their athlete peers. In addition, cheerleaders occupy unique and distinct stressors pertaining to expectations for appearance and behavior. While extant research has examined maladaptive coping mechanisms among competing athletes, the distinct pressures and stressors associated with cheerleading may be associated with unique engagement in maladaptive coping. Accordingly, the present study sought to examine the prevalence and propensity of maladaptive coping behaviors among a sample of current and …

'It's Going To Be Colder Than San Diego': Pre-Transition Experiences Of American Postgraduate Athletes At One British University, Lara Killick, Pete Schroeder

Journal of Athlete Development and Experience

Athlete migration is a visible element of the sport-globalization nexus. At the intercollegiate level, a new migration pattern has recently emerged. Numerous British universities are recruiting American postgraduate athletes for a variety of sports. International athlete migration has been examined using the cultural transition model (CTM) (Ryba et al., 2016). CTM features three phases that profile the developmental tracks migrant athletes experience in a new culture. This study used CTM to qualitatively explore the pre-transition experiences of American postgraduate athletes. Nineteen Americans playing at one British university were interviewed prior to the 2022-23 academic year. Data were recorded, transcribed, and …