Digital Commons Network^™

Geological Environment’S Dynamic Responses And Damage Reduction-Oriented Geological Guarantee In Coal In-Situ Conversion, Wang Shuangming, Geng Jishi, Sun Qiang, Shi Qingmin, Liu Lang, Wang Shengquan, Yang Yuru, Yuan Shihao, Zhang He, Hu Xin

Coal Geology & Exploration

Objective Coal in-situ conversion (ISC) emerges as an important transformative technology for clean and efficient utilization of coal resources. However, safe and stable coal ISC is currently restricted by two major bottlenecks: an unclear understanding of the mechanisms underlying the geological environment’s dynamic responses and a lack of damage reduction-oriented geological guarantee. Methods To construct a damage reduction-oriented geological guarantee system for safe and green coal ISC, this study, from the perspective of the geological environment’s dynamic responses throughout coal ISC, elucidates the scientific connotations of both the dynamic responses and the geological guarantee in coal ISC. Based on the …

Theory And Key Technologies Of Collaborative Management And Control For Groundwater Protection, Treatment, And Utilization In Coal Mining Areas, Dong Shuning, Wang Hao, Guo Xiaoming, Dong Xingling, Qiao Wei, Wang Xiaodong, Zhang Xiyu, Zhang Wenzhong, Zhu Kaipeng, Hu Yunhao, Zhou Zhenfang, Duan Jianhua, Miao Hechao, Wang Tiantian, Wang Hai, Xue Jiankun

Coal Geology & Exploration

Background and Methods To mitigate the contradiction between abundant coal resources and scarce water resources in China, this study proposes a collaborative management and control solution for groundwater protection, treatment, and utilization in coal mining areas. From a theoretical perspective, this study investigates the propagation chains of both the coal mining disturbance to groundwater and the responses of groundwater systems to engineering interventions. Furthermore, it elucidates the core idea, scientific connotation, and technical architecture of the collaborative management and control and explores key technologies involved. Results and Conclusions A technical system based on accurate prediction and precise monitoring, covering treatment-protection …

A Review Of Full-Lifecycle Management Practices For Blue Mining Centered On Sustainable Development And Resource Efficiency, Hou Zhengmeng, Zhang Shengyou, Chen Qianjun, Sun Wei, Zhang Tian, Cai Nan, Huang Liangchao, Wang Qichen, Shi Tianle, Xu Xiaochuan

Coal Geology & Exploration

Against the backdrop of China’s goals of peak carbon dioxide emissions and carbon neutrality, along with the growing demand for critical minerals, this study presents a systematic review of domestic and international literature and engineering cases. Based on the Blue Mining concept proposed by Langefeld’s team of the Clausthal University of Technology and from the perspective of planning forward, this study organizes key technologies, treatment pathways, and essentials of full-lifecycle management used to transition mines from single-purpose stopes to multifunctional infrastructures. Centered on four guiding principles, i.e., energy, ergonomics, water resources, and circularity, this study reviews the synergetic planning process …

Latest Advances In Research On Co2-Enhanced Coalbed Methane Recovery, Sang Shuxun, Liu Shiqi, Li Dianshang, Zhang Shouren, Xu Tianfu, Han Sijie, Zhou Xiaozhi, Huang Fansheng, Liu Tong, Tian Yuchen, Zhang Helong, Niu Qinghe, Chen Yongchun, Zhang Bing, Wu Jie

Coal Geology & Exploration

Background The CO₂-enhanced coalbed methane recovery (CO₂-ECBM) technology integrates greenhouse gas emission reduction and enhanced CBM recovery, holding great significance for achieving the goals of peak carbon dioxide emissions and carbon neutrality of China and ensuring national energy security. However, due to limitations of insufficient fundamental research and some technical bottlenecks, the engineering application of the CO₂-ECBM technology remains in the engineering test stage. This study reviews the latest advances in research on the mechanisms, evaluation methods, and technical systems of CO₂-ECBM and explores key scientific issues and technical pathways for geological …

Key Issues And Research Prospects Of The Commingled-Production Compatibility Of Deep Superimposed Coalbed Methane Systems, Guo Chen, Wang Shuangming, Qin Yong, Xu Fengyin, Sun Xueyang, Xia Yucheng, Hou Enke, Wang Sujian, Sun Qiang, Wang Shengquan, Tang Shengli, Yang Xiankuo, Gao Junzhe, Li Ruiteng, Shi Kang

Coal Geology & Exploration

Objective In recent years, significant breakthroughs have been achieved in the exploration and exploitation of deep coalbed methane (CBM), which has emerged as a major area for the reserve growth and production addition of CBM in China. Variations in the temperature and pressure conditions of deep formations inevitably cause substantial differences in the commingled-production compatibility of deep and shallow superimposed CBM systems. Therefore, revealing the depth effects of the commingled-production compatibility is critical to enhancing the efficiency of the multi-layer commingled production of deep CBM and even coal-measure gas. Methods Using a systematic literature survey of the exploration and exploitation …

Ecological Restoration Strategies Based On Plant And Soil Characteristics For Dumps Of Surface Coal Mines In Cold Arid Regions, Wang Hao, Li Haichao, Jiang Xinjun, Cao Shumiao, Yang Fan, Wang Qiangmin, Xu Ganggang, Shi Hui

Coal Geology & Exploration

Objective The dumps of surface coal mines in cold arid regions represent ecologically vulnerable areas formed under extreme disturbance. However, a lack of systematic studies on the vegetation and soils in dumps, including their spatial variation patterns and synergistic mechanisms caused by vertical differences of the dumps, leads to insufficient theoretical bases for formulating differential ecological restoration strategies in engineering practice.Methods By integrating field ecological surveys and physicochemical tests in the laboratory, this study investigated the dump with elevations ranging from 2498 m-2632 m of the Heishan coal mine on the northern slope of the Tianshan Mountains, Xinjiang. Based …

Advances In Research On Eco-Geological Environment Monitoring Of Underground Coal Mining Areas Based On Airborne Remote Sensing, Li Jun, Zou Zhaohui, Zhang Chengye, Wang Yi, Cheng Yang, Xu Lianhang, Zhang Jinhe, Liu Chuanrui, Liang Lixia

Coal Geology & Exploration

Background Timely and effective monitoring of the current status of eco-geological environment holds great significance for scientific decision-making regarding both geological environment protection and ecological restoration in underground coal mining areas. Owing to its advantage of large-scale and rapid monitoring, airborne remote sensing technology has emerged as an important approach to the eco-geological environment monitoring of mining areas. Advances This study first clarifies relevant concepts of eco-geological environment monitoring, as well as the monitoring requirements and contents specific to underground coal mining areas. Accordingly, it presents a summary of the advances in research on airborne remote sensing technology for the …

From Follower To Leader: Seismic Coal Exploration Techniques In China Over The Past 70 Years−In Celebration Of The 70th Anniversary Of Ccteg Xi’An Research Institute (Group) Co., Ltd., Cheng Jianyuan, Wang Yunhong, Wang Baoli, Li Gang, Li Yuteng, Qin Si

Coal Geology & Exploration

Background After 70 years of innovation and development, China has successfully transformed from a follower into a leader in both high-resolution surface seismic coal exploration techniques and underground in-seam seismic exploration techniques for coal mines. Furthermore, it has achieved disruptive innovations in intelligent seismic-while-mining (SWM) and seismic-while-tunneling (SWT) techniques. These achievements have established China’s worldwide leading position in the overall development of seismic coal exploration techniques.Advances In terms of high-resolution surface seismic coal exploration techniques, China has undergone four development stages: arduously catching up, striving to follow, keeping pace with continuously, and overtaking international counterparts with advanced techniques during …

Entropy-Constrained Closure For Steady, Quasi-One-Dimensional Flow Of Ideal Gases, Andrew A. Oliva

Michigan Tech Publications

An entropy-constrained closure is developed for steady quasi-one-dimensional flow of a calorically perfect ideal gas. Net irreversibility is represented by a prescribed entropy change between the inlet and outlet or, equivalently, by a stagnation pressure ratio together with the stagnation temperature ratio implied by the energy balance equation. The thermodynamic constraint, enforced through Gibbs relation together with conservation of mass and energy, yields an algebraic mapping from the inlet flow state, area ratio and prescribed stagnation property ratios to the outlet flow state. The momentum balance is retained only as an auxiliary post-processing relation and may be used to infer …

Data-Driven Lpv Modeling Via Parametric Dmd And Predictive Control Of Highly Flexible Aircraft, Larry Catalasan, Tianyi He, Weihua Su

Mechanical and Aerospace Engineering Student Publications and Presentations

This paper presents a method of data-driven parametric dynamic mode decomposition (p-DMD) to derive a linear parameter-varying reduced-order model (LPV-ROM) and predictive control for the nonlinear aeroelasticity of highly flexible aircraft. It directly uses the data snapshots obtained at varying flight conditions and encodes a nonlinear model’s polynomial dependency on flight conditions to produce a polynomial-dependent LPV-ROM. The modeling method can handle not only equilibrium flight conditions but also continuously varying flight conditions. In numerical studies, the proposed data-driven p-DMD modeling is applied to a highly flexible cantilever wing perturbed around equilibrium conditions and a flexible aircraft with time-varying angles …

Effects Of Coulomb Collisions On The Structures Of Fast Magnetosonic Shocks, Bo Farnell

Physics and Astronomy Undergraduate Senior Theses

We present fully kinetic particle-in-cell simulations demonstrating qualitative effects of binary Coulomb collisions on fast magnetosonic shocks. We find that with a sufficiently high collisional frequency, shock rippling and reformation can be inhibited, creating stationary, laminar shocks. We see that collisions rapidly bring the reflected population into equilibrium with the upstream population, adding credibility to existing theories that the separation of these two populations create these dynamical behaviors around the shock transition region. We also see that Ohmic heating from Coulomb collisions can suppress instabilities.

Sealing Performance Evaluation Criteria And Profile Optimization Of The Volumetric Cavities Of Positive Displacement Motors For Directional Drilling, Kuang Yuchun, Hu Xin, Zhou Jingpei, Luo Jinwu, Liu Yihui, Han Yiwei

Coal Geology & Exploration

Objective Constrained by complex stratigraphic conditions in underground coal mines, directional drilling faces challenges such as low efficiency when encountering medium-hard and hard formations. Positive displacement motors (PDMs) with a diameter of 89 mm are commonly used for directional drilling. Their efficiency is primarily influenced by the sealing performance of their volumetric cavities, which further significantly affects the drilling efficiency. Methods Based on the structural characteristics of the three-dimensional (3D) volumetric cavities of PDMs and the simulation method of two-way fluid-structure interactions, this study proposed the criteria for quantitatively evaluating the efficiency and volumetric cavity performance of PDMs, followed by …

Distinguishing Drought Experiences: From Perception To Measurement And Their Significance On Productivity Value In Uganda, Parisa Pakrooh, Fabio Gaetano Santeramo, Giuseppe Maggio

Fondazione Eni Enrico Mattei Working Papers

Weather shocks increasingly threaten agricultural productivity in Sub-Saharan Africa. While the negative effects of drought on production have been documented in numerous studies, the behavioral dimension of adaptation, particularly how households perceive drought and what shapes these perceptions, remains less explored. The study focuses on Uganda to distinguish between self-reported drought (subjective) and data-driven drought (objective) and how their divergence is associated with agricultural outcomes. The study relies on four waves of household surveys (UNPS for 2009/10, 2010/11, 2011/12, and 2013/14) with historical re-analysis data on temperature and precipitation from 1981 to 2015. Log-linear and logit models are applied to …

Staff Education On Reducing Falls In Psychiatric Inpatient Care Through A Nurse-Led Multifactorial Education And Prevention Program, Marceline Nkwenti

Walden Dissertations and Doctoral Studies

No abstract provided.

Crime-Related Media Consumption And Fear Of Crime Victimization: The Moderating Roles Of Stress And Coping, Katelyn Elizabeth Byers

Walden Dissertations and Doctoral Studies

No abstract provided.

Experiences Of First-Generation Immigrant Parents In Caring For Children With Type 1 Diabetes, Nahel Kibreab

Walden Dissertations and Doctoral Studies

No abstract provided.

Examining The Impact Of A Self-Employment Vocational Program In Texas On Black Men And Their Recidivism Rates, Alain Marie Matigi

Walden Dissertations and Doctoral Studies

No abstract provided.

Exploring Child Welfare Social Workers’ Professional Versus Personal Values Regarding Medication-Assisted Treatment, Natalie Renee Avery Green

Walden Dissertations and Doctoral Studies

No abstract provided.

Family Caregivers’ Experiences Of Caring For Virally Nonsuppressed Hiv-Positive Adolescents In Uganda, James Byarugaba

Walden Dissertations and Doctoral Studies

No abstract provided.

Confronting Inequality: Three Eras Of Gender And Tax Scholarship, Bridget J. Crawford

Loyola of Los Angeles Law Review

Tax law is not neutral—it encodes social values and reinforces certain longstanding hierarchies. For over fifty years, legal scholarship at the intersection of gender and tax has exposed how seemingly neutral tax laws perpetuate gender inequality. This Article uses the metaphor of quilting to trace the evolution of this scholarly field across three distinct eras.

Part I names and defines the designing era (1971–1986), which began with Grace Blumberg’s writing on the gendered impact of tax laws on marriage, labor, and caregiving; she framed taxation as a tool of social control over women. Blumberg’s work laid the foundation for other …

The Lion's Share: The Secret Land Grab Of Drake's Circumnavigation, Melissa Cole Darby

Anthropology Faculty Publications and Presentations

Francis Drake’s journey around the world between 1577 and 1580 is renowned as one of the most famous voyages in history. The circumnavigation was a great achievement for England, but the official story Queen Elizabeth and her Privy Council maintained for nine years was that Drake was a pirate, and that the treasure he captured on the voyage would be returned to Spain. Upon his return, information about the voyage and his route were suppressed and the crew was sworn to secrecy: they were not to reveal where they travelled on ‘pain of death’. Here I present the case that …

“Big River People”: Human-Nature Interactions In The Mekong And Columbia River Basins, Andrew M. Stone

Forest and Society

The Mekong and Columbia Rivers are a world apart. Yet rivers instantiate and manifest critical ecological relations. This paper draws on qualitative interviews, community dialogues, historical documents, and ceremony-based encounters to examine political practices among "big river people'' in the Mekong and Columbia River basins. It interprets participants' narratives and actions as expressions of ontological politics, i.e., contestation of imposed realities and lifeways. Participants link environmental degradation to violations of relational ethics. Across both study groups, elders and knowledge holders describe ecological and cultural loss as forms of ongoing violence enacted through hydropower development, displacement, and resulting erasure of ways …

Debating Narratives On Artisanal And Small-Scale Mining: Jambi And Bangka Belitung Islands Provinces In Comparison, M. Yusuf, Moh. Arief Rakhman, Michael Lega, Citra Darminto, Riri Maria Fatriani

Forest and Society

Artisanal and small-scale mining (ASM) activities are proliferating and portrayed as playing a significant role in the economies and livelihoods of many countries, while also being correlated with environmental degradation and social issues. The existence of this mining, especially illegal mining conducted by the community, stimulates the emergence of debates among the involved actors to legitimize their arguments and positions, as well as their existence. While the previous discussion featured the contradictions between mining and its impacts, legal aspects, and conflicts, this research reviews the contentious narratives related to ASM in two provinces in Sumatra, Jambi and the Bangka Belitung …

Territorializing Restoration: The Exclusion Of Indigenous Agroforestry In Indonesia, Siswandi Siswandi, Micah R. Fisher, Nurhady Sirimorok, Muhammad Alif K. Sahide

Forest and Society

For decades, formal forest restoration initiatives in Indonesia have largely been driven by the state, companies, international donors, and NGOs. Meanwhile, despite widespread state and plantation enclosures Indigenous Dayak groups have been regenerating lands through swidden and turning them into fruit-based agroforestry for generations. Across Indonesia, traditional practices are largely excluded from the national and international restoration agenda. This paper examines forest restoration through the lens of Indigenous agroforestry, specifically through the transformations unfolding in shifting cultivation practices among the Dayak Ga'ai in Long Buang village, Bulungan District, North Kalimantan. Through a political ecology lens, the study examines the main …

Urban Sociology Oer Syllabus, Can Ersoy

Open Educational Resources

This is a zero cost textbook syllabus for undergraduate level urban Sociology course. It includes readings and visual materials for 6 learning modules, and instructions for a semester-long neighborhood study.

Epileptic Seizure Prediction From Eeg Using Continual Learning With Cnns, Adnan Amin, Ammar Bathich, Feras Al-Obeidat, Safa Naes, Maria Jose Sousa

All Works

Epilepsy is a persistent neurological disorder that affects over 50 million people worldwide, with nearly one-third of patients remaining unresponsive to conventional therapeutic treatments. This study introduces a progressively adaptive seizure prediction framework designed to enhance early detection and clinical decision-making. The proposed model employs a deep learning strategy grounded in continual learning (CL) principles, using Convolutional Neural Networks (CNNs) in combination with knowledge distillation techniques. This enables the model to assimilate new data while retaining previously learned information. The approach was evaluated on the publicly available Bonn University EEG dataset, following a sequential learning process in which each successive …

Symmetry And Psychosocial Adaptation To Trauma, Illness And Disability Part I: Views From Physics, Medicine And Psychology, Hanoch Livneh

Leadership, Learning and Counseling Faculty Publications and Presentations

The aim of this two-part paper is to discuss the concept of symmetry and its derivatives, symmetry breaking and asymmetry, and the role they assume in elucidating the structure and processes that underlie psychosocial adaptation to traumatic experiences. To achieve this aim, in Part I, first, a cursory review of symmetry is undertaken as it applies to physics, including conservation laws, the forces of nature, and leading theories of nature. Second, the paper addresses how symmetry is perceived in biology and medicine, including symmetry within biochemical and genetic structures, the human body, and the onset of disease processes. Third, the …

To Record, To Be Heard, Jiahao Li

Student Theses

Introduction

This capstone project is a pop rock album, including seven original songs written, performed, recorded, and mixed by myself. Four of the songs will be from an old project, for which I had made only demos at home about four years ago. The other three songs were written during the last three years. All songs were recorded in the recording studios at Feirstein. This paper will go through the creation process of this album and explore what songwriting, recording and producing mean to me. I will also talk about the evolution of my practice and my artisthood.

Perceived Concepts Which Influence Initial Methamphetamine Use Amongst Young Latina Women, Rebeca Rivera

Walden Dissertations and Doctoral Studies

No abstract provided.

Examining Parental Self-Efficacy And Its Impact On Teacher Ratings Of Student Adjustment, Moderated By Ses, Russell Craig

Walden Dissertations and Doctoral Studies

No abstract provided.