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Probabilistic Metric Dimension, Kyle Worley Jul 2026

Probabilistic Metric Dimension, Kyle Worley

Master's Theses

The metric dimension of a graph G is the smallest number of unique vertices (often called “marked vertices” or “landmarks”) such that each vertex has a unique distance to the marked vertices. If a set of vertices S ⊆ V (G) when marked gives all vertices unique distances, it is called a resolving set. Hence if G is a graph with a resolving set S, then for all v, u ∈ V (G) there exists s ∈ S such that d(v, s) ̸= d(u, s). The metric dimension dim(G) = min(|S|). Two widely studied variants exist, one where edges are …


Adaptive Task-Driven Lidar Point Cloud Compression For Autonomous Driving, Su Hyun Kim Jul 2026

Adaptive Task-Driven Lidar Point Cloud Compression For Autonomous Driving, Su Hyun Kim

Master's Theses

Autonomous-driving systems generate large LiDAR point clouds, but compression can damage the sparse object-support structure needed by 3D detectors even when reconstructions appear visually plausible. This thesis asks whether adaptive LiDAR compression can preserve downstream detection better than uniform compression by allocating more fidelity to detector-relevant regions. The main study builds a mask-aware range-image codec with an encoder-decoder bottleneck, an importance head, and an adaptive quantization variant. It compares this adaptive variant package with a confirmed masked uniform baseline under one fixed RangeDet evaluation surface and one fixed KITTI validation subset. Two supporting studies bound the result: a projection-reconstruction PointPillars …


Correction To: A Double‑Edged Sword: Ethical And Psychological Implications Of Apoe Genotype Disclosure Across The Lifespan, Diego Iacono Jul 2026

Correction To: A Double‑Edged Sword: Ethical And Psychological Implications Of Apoe Genotype Disclosure Across The Lifespan, Diego Iacono

Department of Neurology Faculty Papers

No abstract provided.


Hybrid Microbial-Enzymatic Electrosynthesis For De Novo Decanoic Acid Production From Co2, Yongze Wang, Wenjin Dong, Meijing Wei, Su Song, Zhiqing Huang, Yaojie Liu, Shelley D. Minteer, Hui Chen Jul 2026

Hybrid Microbial-Enzymatic Electrosynthesis For De Novo Decanoic Acid Production From Co2, Yongze Wang, Wenjin Dong, Meijing Wei, Su Song, Zhiqing Huang, Yaojie Liu, Shelley D. Minteer, Hui Chen

Chemistry Faculty Research & Creative Works

The steady increase in atmospheric CO2 levels is a key driver of anthropogenic climate change, prompting widespread global concern. In this context, the sustainable conversion of CO2 into value-added chemicals represents an attractive route toward carbon-neutral manufacturing and green chemistry. Here, we developed a proof-of-concept hybrid microbial-enzymatic electrosynthesis system that combines microbial electrosynthesis (MES) and enzymatic electrosynthesis (EES) to convert CO2 into decanoic acid under ambient conditions, using electrical energy. In the MES module, CO2 was converted to acetate via the Wood–Ljungdahl pathway of Clostridium ljungdahlii, using H2 produced by electrochemical water splitting as the electron …


Establishing E-Prodeskel, An Integrated Village Information System For The Empowerment Of The Local Community In Kediri, Ani Budi Astuti, Eni Sumarminingsih, Wayan Firdaus Mahmudy, Maulina Pia Wulandari, Wigbertus Ngabu, Nur Kamilah Sa'diyah, Gusti Ayu Putu Rawi Rotchildi, Izza Lailatul Kasanah, Yusuf Gladiensyah Bihanda, Akbar Satya Nugraha Jul 2026

Establishing E-Prodeskel, An Integrated Village Information System For The Empowerment Of The Local Community In Kediri, Ani Budi Astuti, Eni Sumarminingsih, Wayan Firdaus Mahmudy, Maulina Pia Wulandari, Wigbertus Ngabu, Nur Kamilah Sa'diyah, Gusti Ayu Putu Rawi Rotchildi, Izza Lailatul Kasanah, Yusuf Gladiensyah Bihanda, Akbar Satya Nugraha

ASEAN Journal of Community Engagement

Digital transformation has become an important strategy for strengthening community empowerment by improving access to public information, governance transparency, and village services. However, many rural communities in Indonesia still face challenges in managing accurate village profile data and utilizing digital technologies to support good governance and sustainable development. This study examines a community engagement program in Purwokerto Village, Kediri Regency, Indonesia. The program intended to develop and implement E-ProDesKel (Elektronik Profil Desa Kelurahan or Electronic Village and Wards Profile), a web-based portal for an integrated village profile information system. The program adopted a participatory approach starting from an assessment …


"Girl I'Ll Figure It Out": First-Generation Women Of Color Navigating Higher Education, Prisilla Cortez Jul 2026

"Girl I'Ll Figure It Out": First-Generation Women Of Color Navigating Higher Education, Prisilla Cortez

Dissertations

This qualitative study focused on understanding the experiences of first-generation women of color at a California public four-year institution and how their intersecting identities shape their academic experiences and overall well-being. Women of Color Feminist (Crenshaw, 1991), and intersectionality frameworks guided this study. Semi-structured interviews were used to collect data, and thematic analysis was used to identify patterns in participants’ experiences. Findings revealed three central themes, collective orientation and familial expectations, faculty interactions and sense of belonging, and institutional resources and access. Participants described navigating higher education while balancing family responsibilities, financial pressures, and academic demands. Although they demonstrated resilience …


Examining Beliefs Of State Department Of Education Directors Of Assessment Regarding Standardized Testing, Sara L. Kendallen Jul 2026

Examining Beliefs Of State Department Of Education Directors Of Assessment Regarding Standardized Testing, Sara L. Kendallen

Dissertations

Directors of assessment in state departments of education are tasked with the planning and oversight, including development, field-testing, validation, and operationalization of statewide assessments. At the state level, directors of assessment are pivotal to a department of education’s ability to meet state and federal testing requirements. Directors of assessment hold their own opinions and beliefs, which may or may not be aligned with current adopted policies. The beliefs of those in state level educational bureaucracies about standardized testing has not been well-researched. It is hoped that this research will add to the greater understanding of statewide assessment. The goal of …


The Experiences Of Deaf American Muslims In Their Pursuit And Retention Of Employment, Shukry Mahmood Jul 2026

The Experiences Of Deaf American Muslims In Their Pursuit And Retention Of Employment, Shukry Mahmood

Walden Dissertations and Doctoral Studies

Deaf American Muslims in the United States face high levels of unemployment. They often experience compounded marginalization at the intersection of disability, religion, and cultural identity, which often leads to exclusion and underrepresentation in employment contexts. The purpose of the study was to explore the lived experiences while pursuing and retaining employment in the United States of deaf Muslims in United States workplaces. In this qualitative study, a self-designed, semistructured interview protocol with open-ended questions was used to explore these experiences. The sample of 12 participants was selected based on their self-identification as deaf American Muslims with at least 30 …


Analysis Of Electronic Control Unit Optimization On The Performance Of A 150 Cc Motorcycle Engine Using Ethanol-Blended Fuel, Agus Achmad Syaiful, Annisa Bhikuning, Muhammad Rizal Baihaqi, Muhammad Aulia Rafli Jul 2026

Analysis Of Electronic Control Unit Optimization On The Performance Of A 150 Cc Motorcycle Engine Using Ethanol-Blended Fuel, Agus Achmad Syaiful, Annisa Bhikuning, Muhammad Rizal Baihaqi, Muhammad Aulia Rafli

Journal of Mechanical Engineering Science and Technology (JMEST)

The use of ethanol-blended fuel in a standard vehicle can reduce combustion quality, which has an impact on decreasing vehicle performance. At the above 20% blend level, it affects vehicle performance and requires adjustments to engine settings or the Electronic Control Unit (ECU) before use on conventional engines. This study investigates the effect of aftermarket ECU settings on the performance of a 150 cc motorcycle operating on a gasoline-ethanol blend. Four fuel variations were tested: Pertalite (P100), revvo 90 (R100), and 30% ethanol blends (PE30 and RE30). This study analyzes the effects of optimizing injection duration and ignition timing settings …


Can Curriculum Improve Confidence? Examining The Impact Of The Implementation Of The California Math Framework On Math Anxiety Levels Of Preservice Teachers In California, Amanda Lubbs Jul 2026

Can Curriculum Improve Confidence? Examining The Impact Of The Implementation Of The California Math Framework On Math Anxiety Levels Of Preservice Teachers In California, Amanda Lubbs

Dissertations

In 2010, the state of California adopted the Common Core State Standards (CCSS) as an effort to ensure students were graduating high school as college and career ready. Shortly after, in 2013, the California Board of Education adopted the California Math Framework (CMF) as a tool for schools to implement the CCSS for Mathematics (CCSSM). Its recommendations incorporated research-based techniques to alleviate math anxiety through the use of explorative learning experiences that help students understand math skills in applied contexts, and by de-emphasizing rote practice and memorization. This study inquires about the framework’s effectiveness in mitigating math anxiety among pre-service …


"A Door To The Future." A Case Study In Exploratory And Culturally Sustaining Theater Curriculum, Verónica Meza Jul 2026

"A Door To The Future." A Case Study In Exploratory And Culturally Sustaining Theater Curriculum, Verónica Meza

Dissertations

This study addresses the persistent inequities in access to quality arts education for Latino immigrant and linguistically diverse communities in California. Despite progressive initiatives such as Proposition 28 (The Arts and Music in Schools Act) and the California Arts Council's Racial Equity Statement, systemic barriers prevent Latino and immigrant students from benefiting equitably from the arts. The central objective of this project is to understand how an exploratory, culturally sustaining theater curriculum can serve as a transformative and healing vehicle for adult immigrant Latino students, providing emotional protection, cultural affirmation, and language preservation within a U.S. educational context. This qualitative …


An Untouched Gem: Understanding Parental Perceptions On Community College Attendance, Harshdeep Singh Nanda Jul 2026

An Untouched Gem: Understanding Parental Perceptions On Community College Attendance, Harshdeep Singh Nanda

Dissertations

Community colleges serve as critical entry points into higher education, yet they continue to carry stigma, particularly within affluent communities where four-year institutions are often positioned as the expected pathway. While existing research has examined student and public perceptions, little attention has been given to how parents in affluent regions shape and transmit these narratives. This study investigated how parents in an affluent region of the San Francisco Bay Area perceive community college as a starting point for their children’s academic careers and how parents may contribute to shifting those perceptions. Using a convergent parallel mixed methods design, survey data …


Understanding The Impact Of Transfer Orientation Leadership: Student Leader Perspectives At A Mid-Sized California University, Kaci Taylor Turpin Jul 2026

Understanding The Impact Of Transfer Orientation Leadership: Student Leader Perspectives At A Mid-Sized California University, Kaci Taylor Turpin

Dissertations

Community college transfer students represent a vital source of diversity for public four-year institutions; at the same time, declining enrollments heighten the need for stronger, more functional transfer pathways between community colleges and four-year universities, especially given the significant vertical transfer gap and the unique barriers transfer students face in student leadership roles. This semi-structured interview study explored the experiential knowledge of 14 first-generation transfer student orientation leaders to understand how they navigate institutional barriers in their on-campus employment. Findings reveal that these leaders navigated institutional barriers by relying on peer networks and drawing heavily on their navigational capital. Furthermore, …


Reskilling And Retraining The Water Technology Workforce: An Agentic Generative Ai Framework For Water Purification, Nano‑Mems, And Curriculum Development, Satyadhar Joshi, Noor Zulfiqar Jul 2026

Reskilling And Retraining The Water Technology Workforce: An Agentic Generative Ai Framework For Water Purification, Nano‑Mems, And Curriculum Development, Satyadhar Joshi, Noor Zulfiqar

Harrisburg University Other Works

The rapid digitalization of water infrastructure is bringing artificial intelligence, advanced sensing, and membrane materials science into routine water treatment practice. At the same time, utilities, regulators, and training institutions face a persistent workforce challenge: many operators, engineers, and managers are being asked to adopt data-driven tools without a coherent educational pathway that links AI literacy to real treatment workflows. This article synthesizes recent literature on agentic generative AI, reinforcement learning, smart sensing, nano-enabled membranes, and digital twins for water systems, then translates those developments into a structured reskilling model for the water sector. The proposed framework is organized around …


Novel Integrative Mobilizable Elements (Imes) In Vibrio Chromosomes Linked To Translucent Post-Larvae Disease (Tpd), Ruyi Hao, Yan Fang, Yang Yang, Mingshu Yang Jul 2026

Novel Integrative Mobilizable Elements (Imes) In Vibrio Chromosomes Linked To Translucent Post-Larvae Disease (Tpd), Ruyi Hao, Yan Fang, Yang Yang, Mingshu Yang

School of Biological and Marine Sciences

Translucent post-larvae disease (TPD), caused by specific Vibrio parahaemolyticus strains, poses a global threat to shrimp aquaculture. A key virulence factor in these strains is the vhv gene cluster, which encodes toxins central to TPD pathogenesis. While plasmid-borne vhv genes have been extensively studied, the chromosome-borne vhv genes in TPD-associated strains remain poorly characterized. In this study, we systematically analyzed integrative mobilizable elements (IMEs) on the small secondary chromosomes of TPD-associated V. parahaemolyticus. Seven nearly identical novel IMEs harboring full-length vhv clusters were identified from seven independent strains. These IMEs encode a tyrosine recombinase for site-specific chromosomal integration, yet lack …


Application Of Machine Learning For Correcting Defect-Induced Neuromorphic Circuit Inference Errors, Vedant V. Sawal, Hiu Yung Wong Jul 2026

Application Of Machine Learning For Correcting Defect-Induced Neuromorphic Circuit Inference Errors, Vedant V. Sawal, Hiu Yung Wong

Faculty Research, Scholarly, and Creative Activity

This paper presents a machine learning-based approach to correct inference errors caused by stuck-at faults in fully analog ReRAM-based neuromorphic circuits. Using a Design-Technology Co-Optimization (DTCO) simulation framework, the study models and analyzes six spatial defect types - circular, circular-complement, ring, row, column, and checkerboard - across multiple layers of a multi-array neuromorphic architecture for handwritten digit recognition tasks. It is demonstrated that the proposed correction method, which employs a lightweight neural network trained on the circuit's 10 output voltages, can improve inference accuracy from 55% to 90% (+ 35 percentage points) in highly degraded defective scenarios. Results show that …


Beyond Histone Demethylation: Mechanisms Of N-Alkyl Consecutive Oxidations By The Non-Heme Fe(Ii)/2-Oxoglutarate Oxygenase Kdm6b, Simahudeen Bathir Jaber Sathik Rifayee, Sudheesh Devadas, Midhun George Thomas, Bhargav Varada, Ethan Sommer, Cassandra Talaba, Christopher Schofield, Christo Christov Jul 2026

Beyond Histone Demethylation: Mechanisms Of N-Alkyl Consecutive Oxidations By The Non-Heme Fe(Ii)/2-Oxoglutarate Oxygenase Kdm6b, Simahudeen Bathir Jaber Sathik Rifayee, Sudheesh Devadas, Midhun George Thomas, Bhargav Varada, Ethan Sommer, Cassandra Talaba, Christopher Schofield, Christo Christov

Michigan Tech Publications

The nonheme Fe(II)/2-oxoglutarate (2OG)-dependent histone demethylase KDM6B (JMJD3) has demonstrated a capacity for diversity in the oxidative transformations of Nε-alkylated lysine residues in histone H3 peptides; however, the mechanisms of such dealkylations, compared with standard KDM-catalyzed demethylations, remain unexplored. We implemented molecular dynamics and quantum mechanics/molecular mechanics to investigate the catalytic strategies for the sequential oxidation reactions of KDM6B with different N-alkylated forms of lysine K27 in the H3 peptide chain, that is Nε, Nε-methyl ethyl lysine (Lys(Me/Eth)) and Nε-isopropyl lysine (Lys(iPr)). The results for sequential oxidations, which yield alcohol, aldehyde, and …


Micro-Computed Tomography Analysis Of Fibroblast Growth Factor-2 Activity-Induced Healing Of Dentocraniofacial Bones In Rodent Models: A Systematic Review, Fadhlil Ua. Rahman, Azhari Azhari, Lusi Epsilawati, Ria N. Firman, Barunawaty Yunus, Irfan Sugianto, Muliaty Yunus Jul 2026

Micro-Computed Tomography Analysis Of Fibroblast Growth Factor-2 Activity-Induced Healing Of Dentocraniofacial Bones In Rodent Models: A Systematic Review, Fadhlil Ua. Rahman, Azhari Azhari, Lusi Epsilawati, Ria N. Firman, Barunawaty Yunus, Irfan Sugianto, Muliaty Yunus

Journal of Dentomaxillofacial Science

Objective: This study aimed to assess the impact of fibroblast growth factor-2 (FGF-2) on dentocraniofacial bone healing in rodent models using micro-computed tomography (micro-CT).

Materials and Methods: A systematic review was conducted following PRISMA 2020 guidelines. A literature search was conducted using the PubMed, Embase, Web of Science, ScienceDirect, and Wiley Online Library databases. This review included in vivo rodent studies that examined increased FGF-2 activity in craniofacial bones using micro-CT. Methodological quality and risk of bias were assessed using the ARRIVE 2.0 guidelines and the Systematic Review Center for Laboratory Animal Experimentation tool.

Results: A total of 5 studies …


From Transactions To Institutions: The Lawyer’S Role In Building Markets And Trust, L. Viswanathan Jul 2026

From Transactions To Institutions: The Lawyer’S Role In Building Markets And Trust, L. Viswanathan

National Law School Business Law Review

No abstract provided.


Corrigendum: Urban Resilience To Environmental Displacement: Sustainable Design Strategies In Samarra And Najaf, Ghufran Rassam Hade, Khaled H. Mudhee Jul 2026

Corrigendum: Urban Resilience To Environmental Displacement: Sustainable Design Strategies In Samarra And Najaf, Ghufran Rassam Hade, Khaled H. Mudhee

AUIQ Technical Engineering Science

A Corrigendum on Urban Resilience to Environmental Displacement: Sustainable Design Strategies in Samarra and Najaf by G. R. Hade, and K. H. Mudhee, (2026). AUIQ Technical Engineering Science. 3(2):8. doi:10.70645/3078-3437.1068

Reason for Corrigendum:

The editors of AUIQ Technical Engineering Science wish to notify readers of the following corrections to the above-published article.

1. Co-author name

The co-author's name was published as:

Khalid Hammood Mudhahe

The correct name is:

Khaled H. Mudhee

2. Co-author departmental affiliation

The co-author's departmental affiliation was published as:

Department of Civil Engineering, College of Engineering, University of Tikrit, Tikrit, Iraq

The correct affiliation is: …


“The Daemons Of Unplumbed Space”: Einsteinian Portals Into The Unknown In Paul W. S. Anderson’S Event Horizon And H.P. Lovecraft’S The Dreams In The Witch House, Kristine Larsen Jul 2026

“The Daemons Of Unplumbed Space”: Einsteinian Portals Into The Unknown In Paul W. S. Anderson’S Event Horizon And H.P. Lovecraft’S The Dreams In The Witch House, Kristine Larsen

Mythcon

Jason Colavito notes that “cosmic horror” developed in response to the counterintuitive and unsettling repositioning of space and time within Einstein’s Special and General Theories of Relativity, as embodied in H.P. Lovecraft’s Cthulhu Mythos. The horror of such a “weird tale” derives from the violation of already unnatural seeming physical law by the influence of super-natural powers. Lovecraft himself defined a weird tale as containing at least a hint of a “suspension or defeat of those fixed laws of Nature, which are our only safeguard against the assaults of chaos and the daemons of unplumbed space.” Surely the singularity of …


The Tragedy Of The Cognitive Commons: How Ai Could Disrupt The Regeneration Of Professional Expertise, Nolan C. Lovett Jul 2026

The Tragedy Of The Cognitive Commons: How Ai Could Disrupt The Regeneration Of Professional Expertise, Nolan C. Lovett

Educational Leadership & Workforce Development Faculty Publications

Artificial intelligence is reshaping cognitive work, but Human Resource Development scholarship has treated this transformation as an organizational training challenge, leaving the collective regeneration of professional expertise unexamined. This conceptual paper introduces the Cognitive Commons framework, integrating commons theory, HRD scholarship, and distributed cognition to explain how rational AI adoption decisions can deplete the shared expertise pool professions require for renewal. The framework distinguishes Internalized Mastery (deep domain knowledge from sustained practice) from Distributed Mastery (orchestrating human-AI systems), and develops the Validation Tether: effective AI oversight depends on the expertise AI adoption may undermine. Early labor market and clinical evidence …


The Biological Response Of Human Np Cells To Soluble Collagen Vi, Jonathan Dalton, Srikanth N. Divi, Yasmine Eichbaum, Panya Luksanapruksa, Mitchell K. Ng, Rachel Huang, Alan S. Hilibrand, Alex R. Vaccaro, Dessislava Z. Markova, Christopher K. Kepler Jul 2026

The Biological Response Of Human Np Cells To Soluble Collagen Vi, Jonathan Dalton, Srikanth N. Divi, Yasmine Eichbaum, Panya Luksanapruksa, Mitchell K. Ng, Rachel Huang, Alan S. Hilibrand, Alex R. Vaccaro, Dessislava Z. Markova, Christopher K. Kepler

Department of Orthopaedic Surgery Faculty Papers

Extracellular matrix (ECM) dysregulation plays a significant role in the development of intervertebral disc disease (IVDD). The ECM around the chondrocytes in the nucleus pulposus (NP) is unique in that it contains ColVI. While linked to chondrocyte proliferation in cartilage, ColVI's specific role in IVD degeneration is less clear. Our aim was to determine the expression of ColVI in NP cells from degenerative IVDs, along with the effects of soluble ColVI on NP cells. Thus, we compared the expression levels of ColVI in human degenerated IVD samples, along with the effect of soluble ColVI on primary human NP cells. A …


The Use Of Artificial Intelligence In Healthcare, Sean Mcclain, Terry Purcell Mba Jul 2026

The Use Of Artificial Intelligence In Healthcare, Sean Mcclain, Terry Purcell Mba

Research Scholars

No abstract provided.


Development Of Proposed Airworthiness Certification Criteria For Interference-Tolerant Radio Altimeter Systems, Matheus B. Furstenberger Jul 2026

Development Of Proposed Airworthiness Certification Criteria For Interference-Tolerant Radio Altimeter Systems, Matheus B. Furstenberger

Student Works

Radio altimeters provide height-above-ground information to flight deck displays and multiple safety-critical aircraft systems, however legacy certification standards were not developed for high-power terrestrial wireless services operating in adjacent C-Band spectrum. This study addressed the absence of a consolidated airworthiness certification framework for interference-tolerant radio altimeter systems installed on Title 14 Code of Federal Regulations Part 25 transport category airplanes. An archival research synthesis was conducted using publicly available regulations, proposed and final rules, technical standard orders, advisory circulars, airworthiness directives, industry standards, spectrum-management documents, technical studies, and stakeholder comments. Qualitative content analysis and source triangulation were used to identify …


Determinants Of The Abuse Of Artificial Intelligence For Academic Purposes Among Nigerian University Undergraduates, A.M. Adegbore, Solomon Oluwaseun Ojedeji, Ihezie Donatus Ukpabi, Taofeek Gbolahan Muibi, Bamikole Abel Fashogbon, Adebola Kehinde Ojo Jul 2026

Determinants Of The Abuse Of Artificial Intelligence For Academic Purposes Among Nigerian University Undergraduates, A.M. Adegbore, Solomon Oluwaseun Ojedeji, Ihezie Donatus Ukpabi, Taofeek Gbolahan Muibi, Bamikole Abel Fashogbon, Adebola Kehinde Ojo

Library Philosophy and Practice (e-journal)

Abstract

Rationale

The misuse of Artificial Intelligence (AI) is becoming prevalent in academia, particularly among undergraduates. This situation could undermine the main objective of education at the university level, which is aimed at building future professionals for general development. This study examined the determinants of the abuse of artificial intelligence (AI) for academic purposes among Nigerian university undergraduates, with particular focus on federal universities in Southwestern Nigeria.

Material and method

A descriptive survey of the correlational type was adopted. The population comprised 233,454 undergraduates, from which a sample size of 1,593 students was selected using a multi-stage sampling technique involving …


History, Current Status, And Implications Of The Exploration And Exploitation Of Coal Resources In Guangxi, China, Wang Hui, Han Xiaozhong, Peng Zhilong, Li Huoying, Qin Baojian, Lu Ankang, Qin Xiaoyan, Peng Feifei, Xu Huiheng, Lan Bingui Jul 2026

History, Current Status, And Implications Of The Exploration And Exploitation Of Coal Resources In Guangxi, China, Wang Hui, Han Xiaozhong, Peng Zhilong, Li Huoying, Qin Baojian, Lu Ankang, Qin Xiaoyan, Peng Feifei, Xu Huiheng, Lan Bingui

Coal Geology & Exploration

Objective Based on a comprehensive review of the history and current status of coal exploration and exploitation, this study presents an analysis of both the endowment characteristics and the exploration and research levels of coal resources in Guangxi Zhuang Autonomous Region. From the perspective of coal self-sufficiency capacity and energy security guarantee, this study proposes several recommendations for the exploration and exploitation of coal resources in the region. Methods The exploration level, current status of exploitation, and supply-demand imbalance of coal resources in Guangxi are determined through a systematic literature review, surveys of coal mine enterprises, and exchanges with relevant …


Research And Practice Of Four-Dimensional In-Situ Stress Fields For Deep Coalbed Methane Production: A Case Study Of The Daning-Jixian Block, Ordos Basin, Wang Chengwang, Chen Yiyu, Gao Deli, Zhao Haifeng, Chen Gaojie Jul 2026

Research And Practice Of Four-Dimensional In-Situ Stress Fields For Deep Coalbed Methane Production: A Case Study Of The Daning-Jixian Block, Ordos Basin, Wang Chengwang, Chen Yiyu, Gao Deli, Zhao Haifeng, Chen Gaojie

Coal Geology & Exploration

Background Deep coalbed methane (CBM) reservoirs are characterized by well-developed microstructures and natural fractures, along with highly heterogeneous rock mechanical properties and in-situ stress field distribution. The CBM production of the reservoirs tends to cause constantly evolving formation pressure and in-situ stress within the control ranges of CBM wells, further enhancing the complexity of stress distribution. Additionally, severe fracturing channeling can be observed between new and old wells. This phenomenon is primarily triggered by in-situ stress variations induced by large-scale fracturing and CBM production. Therefore, accurately assessing the dynamic evolutionary patterns of in-situ stresses in reservoirs after fracturing and during …


Enrichment Mechanisms Of U And Th Elements In The Bauxite Rock Series Of The Benxi Formation, Lower Carboniferous, Central North China Block, Bian Yukang, Zhang Xiaoyang, Chen Jinfeng, Lyu Dawei, Zhu Dongya, Liu Quanyou, Meng Qingqiang, Shen Xiaoli, Li Qing, Kong Weijiang, Dou Yunfei Jul 2026

Enrichment Mechanisms Of U And Th Elements In The Bauxite Rock Series Of The Benxi Formation, Lower Carboniferous, Central North China Block, Bian Yukang, Zhang Xiaoyang, Chen Jinfeng, Lyu Dawei, Zhu Dongya, Liu Quanyou, Meng Qingqiang, Shen Xiaoli, Li Qing, Kong Weijiang, Dou Yunfei

Coal Geology & Exploration

Objective Uranium (U) and thorium (Th) in rocks and minerals are the material basis for the generation and release of crust-derived helium. Methods The enrichment characteristics and mechanisms of U and Th are key to understanding the accumulation of crust-derived helium reservoirs. Taking the bauxite series of the Benxi Formation in the central North China Block as the research object, this study reveals the enrichment mechanisms of U and Th in the bauxite series and calculates the helium generation rate by means of petrogeochemical and chronological research methods, combined with detrital zircon dating, sedimentary environment identification, and mass balance calculation. …


Sand Tank Experiments On The Seepage And Water Pressure Distribution During Single-Well Dewatering At The Bottom Of A Confined Aquifer, Wang Wenxue, Zhang Mengying, Li Yang, Fang Yuan, Zhao Shuli, Shen Mengjun Jul 2026

Sand Tank Experiments On The Seepage And Water Pressure Distribution During Single-Well Dewatering At The Bottom Of A Confined Aquifer, Wang Wenxue, Zhang Mengying, Li Yang, Fang Yuan, Zhao Shuli, Shen Mengjun

Coal Geology & Exploration

Background Depressurization through dewatering using inclined wells arranged at the aquifer bottom represents a crucial technical approach to the prevention and control of water-sand inrush disasters during coal mining beneath aquifers. However, the mechanisms underlying seepage-pressure interactions and water-preserved depressurization remain poorly understood. Methods Based on the water-yield properties of confined aquifers and the distribution characteristics of inclined wells for dewatering, this study developed a fan-shaped sand tank experimental system for simulating dewatering and seepage from confined aquifers. Using the experimental system, this study carried out seepage experiments using a partially penetrating well at the bottom of a confined aquifer …