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Articles 18721 - 18750 of 1737732
Full-Text Articles in Entire DC Network
Pengaruh Media Sosial Terhadap Proses Pembelajaran Mahasiswa Perpustakaan Dan Sains Informasi, Aswan Pratama, Muh Wahyu Al Fauzal Nasrul, Harianto Harianto
Pengaruh Media Sosial Terhadap Proses Pembelajaran Mahasiswa Perpustakaan Dan Sains Informasi, Aswan Pratama, Muh Wahyu Al Fauzal Nasrul, Harianto Harianto
Jurnal Ilmu Informasi, Perpustakaan, dan Kearsipan
This study aims to analyze the influence of social media usage on the learning process of Library and Information Science students. Using a qualitative method with in-depth interview techniques, this research explores students' experiences and lecturers' perspectives regarding digital interaction in an academic context. The results identify four main patterns: high digital distraction increasing cognitive load, the use of social media as a learning support system, emotional dependency triggering academic procrastination, and self-control strategies applied by students. The findings indicate that social media has a dualistic impact; on one hand, it serves as a source of distraction and time management …
Enhanced Population Mean Estimation Using An Exponential Estimator With Known Medians Of Dual Auxiliary Variables Within A Neutrosophic Approach: Applications In Agricultural Yield Prediction, Anchal Yadav, Mukesh Kumar
Enhanced Population Mean Estimation Using An Exponential Estimator With Known Medians Of Dual Auxiliary Variables Within A Neutrosophic Approach: Applications In Agricultural Yield Prediction, Anchal Yadav, Mukesh Kumar
Neutrosophic Systems with Applications
In classical statistical theory, estimation of population parameters is generally carried out under the assumption that all observed data are precise, complete, and free from ambiguity. However, in many practical and real-world situations, data often deviate from these ideal conditions and instead appear in vague, uncertain, or interval-valued forms. Such imperfections reduce the effectiveness of traditional estimation techniques and motivate the development of more flexible and robust methodologies. To address these challenges, several improved estimators, particularly neutrosophic ratio-type estimators and their advanced extensions, have been proposed in recent literature. In this study, a new estimator known as the two auxiliary …
On Some Properties Of Generalised Regular Anti-Topological Space, Bhimraj Basumatary, Gugu Narzary, Jeevan Krishna Khaklary
On Some Properties Of Generalised Regular Anti-Topological Space, Bhimraj Basumatary, Gugu Narzary, Jeevan Krishna Khaklary
Neutrosophic Systems with Applications
This article studies Regular Anti-open sets and Generalised Regular Anti-open sets within a topological framework, addressing the limited development of anti-open structures in generalised topology. We introduce Regular Anti-open sets and establish their fundamental properties. The study is extended by defining Generalised Regular Anti-open sets, providing a broader and more flexible class of sets. Furthermore, the notions of GR-interior and GR-closure are introduced and analyzed, and their essential properties are obtained. The results contribute to a clearer understanding of generalized anti-open structures and provide a basis for further research in topology.
Hs-Amm: Hierarchical Spatial Attention Mechanism Model For Facial Expression Recognition Based On Deep Learning, Ahmed Oday, Azizi Abdullah, Shahnorbanun Sahran
Hs-Amm: Hierarchical Spatial Attention Mechanism Model For Facial Expression Recognition Based On Deep Learning, Ahmed Oday, Azizi Abdullah, Shahnorbanun Sahran
Baghdad Science Journal
Facial expression recognition (FER) is a significant challenge due to the complexity of multi-class categorization and the subtle differences between emotional factors, with existing deep learning models often struggling to leverage hierarchical local features for accurate distinction. To find a solution, this study proposes a two-method approach, aiming to enhance FER accuracy by refining classification through the arousal-valence dimension and improving feature extraction via an adaptive attention mechanism to resolve the difficulty of differentiating semantically close expressions. The proposed methodology combines (1) a two-level classification strategy, first, performing fine-grained classification, and second, multi-class categorization by grouping expressions into neutral, positive, …
International Law Situations: Economic Warfare At Sea, Raul (Pete) Pedrozo
International Law Situations: Economic Warfare At Sea, Raul (Pete) Pedrozo
International Law Studies
This Situation examines what measures belligerents may take against enemy and neutral merchant ships at sea during an international armed conflict. Operation Epic Fury serves as the backdrop to demonstrate the applicability of economic warfare during international armed conflict at sea. Iranian-flagged and Guyanese-flagged vessels are operating in service of the Iranian economy and war effort. These ships may be captured as part of U.S. economic warfare against Iran.
Ndls Communicator: Week Of 05.26.26, Notre Dame Law School
Ndls Communicator: Week Of 05.26.26, Notre Dame Law School
NDLS Communicator
The Latest News
- Celebrating the Commencement of Notre Dame Law School’s Class of 2026
- Commencement 2026: Dean G. Marcus Cole’s charge to the graduating class
- Commencement 2026: Speech by Distinguished Professor of the Year Fr. Pat Reidy, C.S.C.
- Notre Dame Law School announces awards for 2026 graduating class
- Notre Dame Law Graduate Kyung Mo Kang ’26 J.S.D. Examines Accountability for Human Rights Violations in North Korea Notre
- Notre Dame Law Graduate Tyson Weeks '26 J.D. Receives 2026 Equal Justice Works Regional Public Interest Award
- Paolo Carozza provides insight on Pope Leo XIV’s encyclical Magnifica humanitas
Faculty Briefs
- Dean G. Marcus …
Migrainous Thoracalgia In A Patient With Chronic Migraine And Coronary Vasospasm: A Case Report, Dean Zeldich, Victor S. Wang, Cyril David, Clinton Lauritsen, Claire E.J. Ceriani
Migrainous Thoracalgia In A Patient With Chronic Migraine And Coronary Vasospasm: A Case Report, Dean Zeldich, Victor S. Wang, Cyril David, Clinton Lauritsen, Claire E.J. Ceriani
Department of Neurology Faculty Papers
Migrainous thoracalgia (MT) refers to chest pain (CP) potentially arising from a neurologic etiology, often temporally linked to migraine. We present a 57-year-old woman with chronic migraine who developed recurrent CP typically following migraine attacks. Despite multiple cardiac evaluations, including cardiac MRI and catheterizations, she was diagnosed with fibromuscular dysplasia, spontaneous coronary artery dissection, and coronary microvascular disease. Her CP partially responded to nitroglycerin and improved modestly with migraine control using ubrogepant and calcium channel blockers. During admission for refractory migraine, she received intravenous lidocaine, magnesium, ketorolac, and neuroleptics, resulting in several months of CP remission despite brief migraine relief. …
Evaluation Of Serum Eotaxin And Related Biomarkers In Focal And Generalized Epilepsy, Fenik Ahmed Nadir, Firas Shawqi Algburi, Zeyan Abdullah Ali, Shaima Ahmed Nadir
Evaluation Of Serum Eotaxin And Related Biomarkers In Focal And Generalized Epilepsy, Fenik Ahmed Nadir, Firas Shawqi Algburi, Zeyan Abdullah Ali, Shaima Ahmed Nadir
Baghdad Science Journal
Epilepsy is a common brain disorder, characterized by spontaneous recurrent seizures, with associated neuropsychiatric and cognitive comorbidities and increased mortality. Assessment of serum Eotaxin and related biomarkers offers useful information about neuroinflammatory activity and metabolic imbalance in epilepsy, and may have potential value as diagnostic and prognostic tools. The aim of this study was to evaluate the association between Eotaxin, Intelectin-1, Kynurenine, and Proprotein Convertase-1 and epilepsy. The study consisted of 90 subjects who were classified into three groups: 30 healthy controls, 31 patients with focal epilepsy, and 30 patients with generalized epilepsy. Serum samples were obtained, and biomarker concentrations …
A Goal Programming Approach For Finding The Best Compromise Solution Of Multiobjective Linear Programming Under Neutrosophic Environment, Sultan S. Alodhaibi, Hamiden Abd El- Wahed Khalifa
A Goal Programming Approach For Finding The Best Compromise Solution Of Multiobjective Linear Programming Under Neutrosophic Environment, Sultan S. Alodhaibi, Hamiden Abd El- Wahed Khalifa
Neutrosophic Systems with Applications
Decision problems often involve multiple objectives that conflict, making simultaneous optimization impossible. These problems require trade-offs to achieve a solution that balances the competing goals. In this paper, the detailed discussion that is related to linear programming (SVTrNFMOLP) with single valued trapezoidal neutrosophic numbers is made. Furthermore, this study deals with all the related parameters and discussion. As rank function and due to its definition, the SVTrNFMOLP is transformed in the crisp MOLP. It is noticed that goal programming is best to get the best compromise solution. The advantages of the proposed approach are: The use of Tr allows the …
Expert Recommendations To Strengthen Chikungunya Outbreak Surveillance And Reporting For Traveler Health Protection, Daniel C. Payne, Karoun H. Bagamian, Jeffery Goad, Nathan D. Grubaugh, Michael A. Johansson, Moritz U. G. Kraemer, Eyal Leshem, Francesca F. Norman, Alfonso J. Rodríguez-Morales, Henrik Salje, Stephen Thomas, Scott C. Weaver, Lindsey A. Laytner, Rebecca Sturgis, Suzanne K. Scheele, Davidson H. Hamer
Expert Recommendations To Strengthen Chikungunya Outbreak Surveillance And Reporting For Traveler Health Protection, Daniel C. Payne, Karoun H. Bagamian, Jeffery Goad, Nathan D. Grubaugh, Michael A. Johansson, Moritz U. G. Kraemer, Eyal Leshem, Francesca F. Norman, Alfonso J. Rodríguez-Morales, Henrik Salje, Stephen Thomas, Scott C. Weaver, Lindsey A. Laytner, Rebecca Sturgis, Suzanne K. Scheele, Davidson H. Hamer
Pharmacy Faculty Articles and Research
Chikungunya, a debilitating mosquito-borne disease caused by chikungunya virus, has surged dramatically in the past two decades. Chikungunya outbreaks can intensify rapidly, with infections posing a significant endemic health burden in tropical/subtropical areas and for travelers. Health professionals require timely and accurate outbreak information to adequately protect travelers and assess chikungunya risk. However, detection is often insufficient in the areas most susceptible to outbreaks, leading to diagnostic and reporting delays. Consequently, travelers are often unaware of increased chikungunya infection risk at their destination. We assessed chikungunya surveillance and reporting resources, and we developed expert recommendations for traveler health protection. Because …
The Worker Voice Gap: How Much Say Do Workers Want—And How Much Do They Actually Experience?, Alexander Hertel-Fernandez, Thomas A. Kochan
The Worker Voice Gap: How Much Say Do Workers Want—And How Much Do They Actually Experience?, Alexander Hertel-Fernandez, Thomas A. Kochan
Upjohn Institute Policy Papers
•The worker voice gap—the difference between the influence that workers want and what they experience—is very large. Nearly three-quarters of American workers want more voice at work than they currently have in three key areas: 1) compensation, 2) working conditions, and3) use of new technologies at work.
• The voice deficit is largest for compensation, but majorities of workers also express voice gaps over working conditions and the use of new technologies in their workplaces.
•Although voice gaps are relatively widespread, women tend to report larger voice gaps than men, and younger and middle-aged workers tend to report larger gaps …
Mining And Sustainable Development In Sierra Leone: The Role Of Institutional Quality, Ibrahim Massaquoi
Mining And Sustainable Development In Sierra Leone: The Role Of Institutional Quality, Ibrahim Massaquoi
Journal of Sustainable Mining
While mining can drive economic growth, create jobs, and promote infrastructural development, it also poses risks to the environment, human health, and social well-being. Therefore, to achieve sustainable development, responsible mining is crucial. This study empirically examines the role of institutional quality in the mining-sustainable development nexus in Sierra Leone. With the use of the planetary pressures-adjusted human development index (PHDI) as a comprehensive measure of sustainable development, the study is able to integrate economic, social, and environmental dimensions. The autoregressive distributed lag (ARDL) model confirms the existence of both short-run and long-run dynamics. The results of the study show …
Hope And The Handiwork Of Varda: Celestial Signposts Of The Music’S Mending, Kristine Larsen
Hope And The Handiwork Of Varda: Celestial Signposts Of The Music’S Mending, Kristine Larsen
Journal of Tolkien Research
Varda, the Queen of the Valar, wields tremendous cosmological power in Tolkien’s legendarium. It is not without cause that Melkor fears her, as her power is literally written in the stars for all to see. Not only do her bright stars and constellations provide light against the darkness, but two of her creations – the Valacirca (Big Dipper) and Menelmacar (Orion) – are direct and intentional warning signs to Melkor of his unavoidable defeat in the Last Battle at the end of days. Indeed, Melkor’s capture by the armies of the Valar at the end of the First Age is …
Distributed Self-Control Of Dynamical Networks By Adaptive Link Weight Adjustments, Hiroki Sayama
Distributed Self-Control Of Dynamical Networks By Adaptive Link Weight Adjustments, Hiroki Sayama
Northeast Journal of Complex Systems (NEJCS)
Conventional control theory considers controlling the behavior of a dynamical system toward a desired state by injecting externally designed inputs into the system. Meanwhile, most complex systems exhibit self-organization through local information exchanges among individual dynamical components that are embedded within a complex network of interactions. The self-organizing dynamics of those systems are realized in a highly distributed manner using locally available information only, and therefore, their behaviors have not been discussed much from a control theoretic viewpoint. Meanwhile, adaptive networks, i.e., dynamical networks whose states and topologies coevolve at similar time scales, can offer a promising theoretical framework in …
Integrated Passive Design Strategies For Enhancing Energy Performance Of Hotel Buildings In Hot-Arid Climates: A Simulation-Based Study, Esraa Ebrahiem Abu-Elenain
Integrated Passive Design Strategies For Enhancing Energy Performance Of Hotel Buildings In Hot-Arid Climates: A Simulation-Based Study, Esraa Ebrahiem Abu-Elenain
HBRC Journal
Sustainable architectural design strategies offer effective solutions for enhancing energy efficiency and reducing operational costs in energy-intensive buildings, such as hotels in hot-arid climates. However, limited research has addressed the integrated application of multiple passive design strategies within hotel buildings using a unified simulation-based framework. This study investigates the combined application of wind catchers (Malqaf), adaptive mashrabiya shading systems, and high-performance glazing on a proposed hotel floor in Ras Sedr, Egypt. The design was modeled in Autodesk Revit and analyzed through dynamic simulation using EnergyPlus. A comparative approach was adopted, including a baseline scenario and an improved design scenario. The …
Enhancing Social Activity Through Climate-Adaptive Design In Hot-Humid Campus Open-Spaces: A Case Study Of The University Of Basrah In Iraq, Noor A. Almansor, Farah Ahmed Thiab, Riyam Rajab Fenjan
Enhancing Social Activity Through Climate-Adaptive Design In Hot-Humid Campus Open-Spaces: A Case Study Of The University Of Basrah In Iraq, Noor A. Almansor, Farah Ahmed Thiab, Riyam Rajab Fenjan
HBRC Journal
Outdoor open spaces between university buildings support students' community interactions and academic achievements. However, in hot-humid climate zones, some of these spaces lack activity and experience social withdrawal due to thermal discomfort. This is seen on the University of Basrah campus. To address this, the study aimed to identify the most suitable climate-adaptive design pattern to improve thermal comfort and, in turn, enhance students' social presence in the University of Basrah's neglected, peripheral outdoor campus spaces. A convergent mixed-method case study was applied. First, measurable environmental and social factors were identified from related studies. Next, two open spaces in the …
The Impact Of Climate Change On Glass Facades: A Bibliometric Analysis, Pelin Akın, Güneş Mutlu Avinç
The Impact Of Climate Change On Glass Facades: A Bibliometric Analysis, Pelin Akın, Güneş Mutlu Avinç
HBRC Journal
Climate change has direct impacts on the design and performance of building envelopes, necessitating new approaches in the discipline of architecture. In this study, a bibliometric analysis was conducted to understand the effects of climate change on glass façade systems. The 612 academic publications obtained from the Web of Science database were analyzed through R Studio Biblioshiny. Within the scope of the study, publication trends, key themes, prominent authors, institutions and geographical distributions were evaluated in detail. According to the findings of the research, it was indicated that research has gained momentum especially after 2016, focusing on themes such as …
Advances In Kenaf Fibre Reinforced Biocomposites: Processing Techniques, Performance Optimisation, And Future Research Directions, Thomas Adedayo Ayorinde, Tamba Jamiru, Peet F Le Roux, Basiru Philip Aramide, Oluwafemi Emmanuel Ogundahunsi
Advances In Kenaf Fibre Reinforced Biocomposites: Processing Techniques, Performance Optimisation, And Future Research Directions, Thomas Adedayo Ayorinde, Tamba Jamiru, Peet F Le Roux, Basiru Philip Aramide, Oluwafemi Emmanuel Ogundahunsi
Engineering and Technology Journal
Kenaf fibre-reinforced composites have attracted considerable interest lately as eco-friendly materials due to their light weight, renewability, degradability, and favourable specific mechanical properties. Despite the advances already achieved in natural fibre composites, the commercial-scale use of kenaf-based composites has been hindered by variations in raw material quality, moisture sensitivity, interphase degradation, thermal instability, and other processing issues. This review critically assesses the morphology, reinforcement behaviour, fibre extraction methods, surface treatments, manufacturing processes, and characterisation techniques employed for kenaf fibre-reinforced composites within the framework of performance and sustainability. The study shows that no extraction and manufacturing process simultaneously optimises fibre integrity, …
Study Of Compressive Strength Of Palm Kernel Shell Concrete Under Various Curing Methods And Predictive Modeling Using Machine Learning, Hyginus Obinna Ozioko, Emmanuel Ebube Eze, Edward Ingio Adah
Study Of Compressive Strength Of Palm Kernel Shell Concrete Under Various Curing Methods And Predictive Modeling Using Machine Learning, Hyginus Obinna Ozioko, Emmanuel Ebube Eze, Edward Ingio Adah
Engineering and Technology Journal
This study evaluates the compressive strength of Palm Kernel Shell Concrete (PKSC) under different curing methods and develops machine learning models for strength prediction. Concrete mixes containing 0–100% PKS replacement of coarse aggregate were prepared at a constant water-cement ratio of 0.5 and cured by immersion, sprinkling, wet hessian, and open-air methods. Compressive strength was measured at 7, 14, 21, and 28 days. Increasing PKS content reduced slump from 82 mm to 18 mm, oven-dry density from 2390 kg/m3 to 1430 kg/m3, and initial setting time from 108 min to 76 min. Immersion curing produced the highest …
A Hybrid Deep Learning Framework For Multi-Class Retinal Disease Classification, Ali M. Duhaim, Abbas M. Al-Bakry
A Hybrid Deep Learning Framework For Multi-Class Retinal Disease Classification, Ali M. Duhaim, Abbas M. Al-Bakry
AUIQ Technical Engineering Science
Ocular diseases such as diabetic retinopathy, glaucoma, and cataract remain major causes of vision loss worldwide, creating an increasing demand for accurate and reliable automated diagnostic systems. Although deep learning techniques have demonstrated strong performance in retinal image analysis, their clinical adoption is still limited by challenges related to predictive reliability, robustness, and interpretability. This study presents HEFR-Net (Hybrid EfficientNet-B3 and ResNet-50 Feature-Fusion Network), a hybrid deep learning framework designed for multi-class classification of retinal fundus images. The proposed architecture integrates EfficientNet-B3 and ResNet-50 through feature-level fusion, enabling the model to capture both fine-grained texture patterns and high-level structural characteristics …
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
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
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
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
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
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
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
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
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
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 …
Effects Of Coulomb Collisions On The Structures Of Fast Magnetosonic Shocks, Bo Farnell
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.