Digital Commons Network^™

Analytical Model For Reactive Solute Transport In A Channel-Matrix System, Wei Nana, Li Xu, Xu Guangquan, Zhang Haitao, Shao Zefan

Coal Geology & Exploration

Objective The accurate quantitative characterization of fractured media and the theoretical research on solute transport in fractured media have become the key to the prevention and control of groundwater contamination in fractured aquifers. Currently, fractured aquifers are generalized to horizontal fractures, ignoring the geometric characteristics of the open parts of fractures, called channels, and the impacts of matrix diffusion on solute transport. Methods A model for solute transport in a single channel-matrix system was established, obtaining the semi-analytical solutions using Laplace and numerical inverse transforms. The COMSOL Multiphysics software was employed to construct a numerical model for verification. Furthermore, the …

Landslide Sensitivity Assessment Of Coal Mining Subsidence Areas Based On Information Value - Machine Learning Coupling Models, Niu Chenhao, Jiao Runcheng, Han Jianfeng, Wang Shengyu, Guo Xuefei, Liu Chang, Han Yucheng, Song Guofeng

Coal Geology & Exploration

Objective Due to their special geological conditions and coal mining background, coal mining subsidence areas are prone to suffer from ground cracks and subsidence, which tend to further induce geological disasters such as landslides. This makes it extremely necessary to conduct landslide sensitivity assessment of these areas using appropriate influencing factors and training models. Methods This study investigated the Xishan coal mine area in Beijing as an example to conduct landslide sensitivity assessment of coal mining subsidence areas by coupling slope units with mathematical statistical and machine learning models. With 10 influencing factors, including topographic and geomorphic factors such as …

Research And Application Of The Seismic Exploration Technique Using Reflected In-Seam Waves In Identifying Folds And Faults In Coal Seams, Wu Guoqing

Coal Geology & Exploration

Background Accurately identifying subsurface anomalies is crucial to building a geological transparency system in the transformation to intelligent coal mines. The precise exploration of fold anomalies is a challenge of underground geophysical exploration technology, holding great significance for reducing excavation costs, mining difficulties, and safety risks. Objective and Methods Previous in-seam seismic explorations reveal that folds pose significant impacts on the propagation characteristics of in-seam waves. However, conventional inversion techniques of in-seam waves are difficult to distinguish folds from faults. This study constructed numerical models for faults and folds with similar geometric shapes and equal exploration distances. Specifically, the differences …

A Method For Reconstructing Consecutively Missing Seismic Data Based On Recurrent Feature Reasoning, Li Zijuan, Chang Guangyao, Jia Yongna

Coal Geology & Exploration

Objective Due to the constraints of natural environments like rapids, rifts, and high mountains, the acquired seismic data are often challenged by consecutive missing, affecting subsequent seismic data processing and geologic analysis. Hence, it is necessary to reconstruct the missing data through interpolation. Methods This study proposed a method for reconstructing consecutively missing seismic data based on recurrent feature reasoning. First, the missing seismic data undergo partial convolution operations, in which the weight of the convolution results is adaptively adjusted based on the proportion of valid feature map data in the receptive field, avoiding invalid convolution operations on consecutively missing …

A Neural Network-Based Method For Analyzing Diffracted Wave Velocity, Tao Junhong, Zhao Jingtao, Sheng Tongjie

Coal Geology & Exploration

Background In seismic imaging, accurate velocity models are crucial for characterizing subsurface structures in a fine-scale manner. Notably, in coal mining, small-scale geological structures like faults and collapse columns are closely associated with mining accidents. These structures typically occur as diffracted waves in seismograms.Objective and Methods To effectively image these small-scale geological bodies, fine-scale velocity modeling using diffracted wave information is particularly important. Hence, this study proposed a neural network-based method for analyzing diffracted-wave velocity. First, diffracted-wave velocity spectra were generated using the gathers of diffracted waves that were separated in the common virtual source domain. Second, a gamma-ray …

Key Technology And Practice Of Deep Borehole Pneumatic Directional Drilling In Broken-Soft Coal Seam In Yangquan Mining Area, Liu Fei, Li Quanxin, Fang Jun, Liu Jianlin, Yang Weifeng, Chu Zhiwei, Zhao Jianguo, Wang Siyi

Coal Geology & Exploration

Objective In response to the need for precise, proactive, and regional management of gas in the broken-soft coal seam of the Yangquan Mining Area, a technical scheme utilizing pneumatic directional drilling for pre-drainage boreholes was proposed. Methods Based on the analysis of the technical challenges in pneumatic directional drilling, a series of technologies suitable for the broken-soft coal seam in the Yangquan Mining Area were developed. These include stable operation technology for pneumatic downhole motors, precise control technology for drilling boreholes, efficient deep-hole slag discharge technology, and pneumatic milling and salvage technology. The pneumatic directional drilling equipment was optimized, and …

Emergency Response And Critical Technologies For Large-Diameter Boreholes In Mine Rescue Through Surface Drilling, Ma Tan, Zhuge Lei, Zhao Weidong

Coal Geology & Exploration

Objective Large-diameter lifesaving holes have been successfully applied multiple times in mine rescue through surface drilling. However, they show limitations in emergency response like quick dispatch and cross-regional rescue, and their technological adaptability is insufficient to cope with complex strata. Methods From the perspective of overall emergency rescue, with rescue timeliness as an indicator, this study summarized the critical technologies like response capability enhancement and borehole-forming technology for complex strata. It constructed an emergency handling process for mine rescue through surface drilling, specified the improvements in contingency plan activation, response actions, and response speeds, and established the hierarchical cross-regional rescue …

تحليل تاريخي للممارسة التخطيطية الاولى لطرق مدينة البصرة سنة 1917, Armin Sarkis Markaryan

Emirates Journal for Engineering Research

المخلص: تنوعت وسائل النقل في المدن المختلفة فمنها النقل المائي الذي يتمثل بالنقل البحري والنهري, والنقل الجوي, والنقل البري, والاخير يمثل احدى السبل الاكثر رواجاً في اغلب المدن, ولكون هذه الوسائل تحتاج الي بنى تحتية, برزت اهمية الطرق في النقل البري كونها الشرايين الرابطة بين اجزاء المدن, ولا تعد مجرد طرق للمواصلات وانما تتعدى هذه الخاصية الي امتلاكها خصائص ومميزات مكانية مع مرور الزمن. ولأجل ذلك تطرق البحث الي طرق بصورة عامة, وبعد نقد الدراسات والطروحات السابقة تبين وجود نقص معرفي متمثل في عدم وجود دراسة معمارية مختصة بتخطيط طرق مدينة البصرة لسنة 1917, بوصفها الممارسة التخطيطية الاولى لطرق المدينة, …

Underrepresentation Of Women In Stem, Ella Asare Afortor

JWU Dissertations & Theses

Despite a plethora of initiatives undertaken by the U.S. government, corporate entities, nongovernmental organizations, and the society at large, the representation of women across various Science, Technology, Engineering, and Mathematics (STEM) fields remains dismally low (Martinez & Christnacht, 2021; Srivastava, 2019; Swafford & Anderson, 2020; Wright, 2018). This situation is compounded by a high attrition rate with about 50% of women leaving STEM careers by the age of 35 (Maynard, 2021). Numerous studies have highlighted the underrepresentation of women in various STEM disciplines, raising concerns about the missed opportunities for societal progress and the need for comprehensive strategies to address …

Spartan Daily, September 25, 2024, San Jose State University, School Of Journalism And Mass Communications

Spartan Daily, 2024

Volume 163, Issue 14

Accumulation Patterns And Exploitation And Utilization Targets Of Geothermal Resources In The Coal-Bearing Area In North China, Pang Zhonghe, Duan Zhongfeng

Coal Geology & Exploration

Objective China is a major producer and consumer of coal resources in the world. The urgent need for the transition of the coal industry necessitates the investigation of both the origin and distribution patterns of geothermal resources in the coal-bearing areas of the country. The coal-bearing area in North China, with geothermal reserves accounting for 74.7% of the whole country, stands out as one of the areas with the most abundant geothermal resources nationally. This area encompasses four major coal-bearing basins: the Bohai Bay, Ordos, Qinshui, and Southern North China, with the lithospheric thermal state gradually weakening from east to …

Convection - Heat Transfer Coupling Mechanism For Closed-Loop Heat Extraction From Hydrothermal Resources Using Horizontal Wells, Gu Feng, Li Youwu, Zhang Yue, Gao Ying, Yang Peng, Wang Anran, Cui Jingyun

Coal Geology & Exploration

Objective Closed-loop heat extraction technology, which extracts geothermal energy without draining geothermal water, has emerged as a research focus in geothermal energy exploitation. However, there is a lack of studies on the impacts of convection in reservoirs on heat transfer. Methods To improve single-well heat extraction, this study proposed a technology of closed-loop heat extraction from hydrothermal reservoirs using horizontal wells. This technology aims to increase the contact area between wellbores and reservoirs while fully leveraging the convection in reservoirs. A flow and heat transfer model characterized by the coupling of horizontal wells, circulating water and reservoirs was established to …

Optical Lens Attack On Deep Learning Based Monocular Depth Estimation, Ce Zhou, Qiben Yan, Daniel Kent, Guangjing Wang, Ziqi Zhang, Haydar Radha

Computer Science Faculty Research & Creative Works

Monocular Depth Estimation (MDE) plays a crucial role in vision-based Autonomous Driving (AD) systems. It utilizes a singlecamera image to determine the depth of objects, facilitating driving decisions such as braking a few meters in front of a detected obstacle or changing lanes to avoid collision. In this paper, we investigate the security risks associated with monocular vision-based depth estimation algorithms utilized by AD systems. By exploiting the vulnerabilities of MDE and the principles of optical lenses, we introduce 𝐿𝑒𝑛𝑠𝐴𝑡𝑡𝑎𝑐𝑘, a physical attack that involves strategically placing optical lenses on the camera of an autonomous vehicle to manipulate the perceived …

Curriculum Subcommittee Agenda October 3, 2024, Utah State University

Educational Policies Committee

• Approval of Minutes - September 5, 2024
• Program Proposals
• Semester Course Approval Reviews
• College of Agriculture and Applied Sciences
• Caine College of the Arts
• Jon M. Huntsman School of Business
• Emma Eccles Jones College of Education and Human Services
• College of Engineering
• College of Humanities and Social Sciences
• S.J. & Jessie E. Quinney College of Natural Resources
• College of Science
• College of Veterinary Medicine
• Other
• Other Business
• Adjourn: 3:00 pm

Smokejumper Obituary: Congleton, Walter Sheldon (Cave Junction 1968), National Smokejumper Association

Smokejumper Obituaries

No abstract provided.

A Comprehensive Survey Of Penicillin Allergy Education Among United States Colleges And Schools Of Pharmacy, Wesley D. Kufel, Meghan N. Jeffres, Christopher M. Bland, Bruce M. Jones, Mary L. Staicu, Julie Ann Justo, P. Brandon Bookstaver, Lisa M. Avery

Pharmacy Faculty Scholarship

Background: Pharmacy students should be prepared to evaluate, manage, and de-label penicillin allergies. It is unknown if, and to what extent, education about allergy management is included within the curriculum of United States Colleges and Schools of Pharmacy (USCSP). This study sought to evaluate if and how penicillin allergy education is delivered and assess faculty perceptions of student readiness.

Methods: A cross-sectional, multicenter, observational survey was developed by infectious diseases (ID) pharmacy faculty and sent to ID faculty or department chairs at 138 USCSP. The 39-item questionnaire was divided into demographics, incorporation of targeted or aligned penicillin allergy education in …

2024 September 25 - Undergraduate Curriculum Council Minutes, Undergraduate Curriculum Council, East Tennessee State University

Undergraduate Curriculum Council Minutes

No abstract provided.

Fs Steering Committee Agenda 2024-09-25, Northern Illinois University

Faculty Senate Archives

No abstract provided.

Gec Meeting Minutes For Sept 25, 2024, General Education Committee

General Education Committee Minutes

No abstract provided.

Aac September 2024 Meeting Minutes, A-State Assessment Committee

Accreditation and Assessment Committee Minutes

No abstract provided.

September 25, 2024 (Vol. 109, No. 5), Daily Eastern News

Daily Eastern News: 2024-2025

No abstract provided.

Senate Bill 2024-14, Paige Oltmans

Approved Senate Bills, Resolutions, and Documents

Funding for International Food Festival

African American Baptist Pastors' Experience Counseling Congregants With Emotional Distress In The Role Of Mental Health Providers, Patricia W. Brown-Irby

Walden Dissertations and Doctoral Studies

The rise of emotional distress and other mental health issues in the church is a significant concern. African American congregants depend more on their pastors to assist them with issues such as emotional distress, stress, finances, and marital discord. As an essential institution in the community, the church represents the ideal setting to address many of the issues experienced by congregants. Role theory was used as the theoretical framework, as roles often entail particular risks and benefits that can differ depending on human traits, historical periods, and cultural settings. The methodology was qualitative, interpretative phenomenology; interviews were conducted with African …

The Parthenon, September 25, 2024, Evan Green, Sarah Davis, Baylee Parsons, Joseph Dicristofaro, Kaitlyn Fleming, Scott Price, Abigail Cutlip, Rafael Alfonso, Wade Sullivan

The Parthenon

No abstract provided.

Fs Steering Committee Minutes 2024-09-25, Northern Illinois University

Faculty Senate Archives

No abstract provided.

Book Review: Putin’S War On Ukraine: Russia’S Campaign For Global Counter-Revolution, Lionel M. Beehner

Parameters Bookshelf – Online Book Reviews

Author: Samuel Ramani

Reviewed by Dr. Lionel M. Beehner, senior Russia analyst, Foreign Military Studies Office, and senior editorial director, Columbia University School of International and Public Affairs

Senior Russia analyst Dr. Lionel M. Beehner provides thoughtful praise and critiques on Samuel Ramani’s 2023 book, Putin’s War on Ukraine, calling it “a must-read for diplomats and defense experts.” According to Beehner, Ramani provides “a front-row seat to the war,” helpfully “recalls incidents that may be buried in readers’ minds,” and “masterfully shows the chaos within Russian leadership circles near the invasion.” Beehner also distills and explains Ramani’s main point—that the …

Two Ways Law Professors Can Defend American Democracy, Bruce Ledewitz

UIC Law Review

No abstract provided.

Raymond Lofstad V. Secretary United States Department Of Commerce

2024 Decisions

USDC for the District of New Jersey

In Re: Jahad Lemons

2024 Decisions

USDC for the District of New Jersey

Lili Wan V. Central Transport Llc

2024 Decisions

USDC for the District of Delaware