Engineering Commons^™

Precise Magnetotelluric Single-Component Processing Technology And Detection Of Deep Disaster-Causing Water Body, Li Peitao, Wu Qiang, Li Zhuorong, Li Wenyu, Xie Jian, Wang Yuxi

Coal Geology & Exploration

In order to realize the fine detection of hydrogeological conditions by natural source single-component magnetotelluric technology, the problems of magnetotelluric signal acquisition and processing were systematically analyzed, and study was conducted for the response characteristics of underground water-rich area on magnetotelluric wave. Besides, water-richness index model was established according to the magnetotelluric sounding theory and analytic hierarchy process. Moreover, the corresponding relationship between waveform and lithology was fitted based on a large amount of experimental data, and the information on physical properties, such as the dielectric constant, elastic brittleness, density and porosity was extracted from the fractal dimension of waveform. …

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

Laws And Prevention Methods Of Ground Cracks In Shallow Coal Seam Mining, Hou Enke, Xie Xiaoshen, Feng Dong, Chen Qiuji, Che Xiaoyang, Hou Pengfei

Coal Geology & Exploration

The large-scale and high-intensity mining of shallow coal seams in northern Shaanxi has induced serious ground collapse, resulting in land damage in large area, water and soil loss, and vegetation death, and thus leading to the epigenetic environment degradation. In order to understand the development law of ground collapse and fracture in shallow coal seam mining, clarify its mechanism, and put forward the appropriate treatment and restoration measures to realize the coordinated development of “coal-water-ecology”, Zhangjiamao mine field and Ningtiaota mine field in northern Shaanxi were taken as the study area. On this basis, the development law and control methods …

Influence Of Thick Sandstone On Development Of Overburden Mining Fissures In Northern Shaanxi Coal Mining Area Of Yellow River Basin And Suggestions On Water-Preserved Coal Mining, Wang Shuangming, Wei Jiangbo, Song Shijie, Wang Shengquan, Sun Tao

Coal Geology & Exploration

The change of geological conditions of coal seam roof overburden and the development of mining fissures caused by coal mining activities are the direct causes of damage to the key underground aquifers, and also the root causes of ecological environment degradation in the mining area. As a typical geological condition, the thick sandstone developed in the overburden structure of the coal seam roof has an important impact on the development law of mining fissures in the overburden. Therefore, the influence of the thickness and location of different thick sandstones on the development morphology and height of overburden mining fractures was …

Geological Soil Formation For Ecological Restoration Of Mining Areas And Its Case Study, Hu Zhenqi, Zhang Zixuan, Sun Huang

Coal Geology & Exploration

Soil is an important substrate of plant growth, as well as the key for successful ecological restoration of mine. In view of the status of insufficient soil for most of ecological restoration of mine and the reality of a very long process of geological soil formation, the concept and method of geological soil formation for ecological restoration of mine (Mine-GSF for short) were discussed on the basis of description on the principle of natural geological soil formation. Natural geologic soil formation is the process of turning “rock” into “soil” through a long period of macro-geological cycle and biological cycle, including …

Succession Process And Management Mode Of Land Reclamation In Open-Pit Coal Mine Areas Based On Vegetation Rehabilitation, Zhou Wei, Guan Yanjun

Coal Geology & Exploration

Rehabilitated vegetation plays an important role in energy exchange and ecological cycling, and its dynamic change can characterize the extensive details of the disturbance to and the restoration of ecosystem in coal mining areas. From the points of different disturbance states of vegetation in the coal mining area, such as the undisturbed state, the coal mining disturbance state, the restoration state and the post-restoration state, six succession scenarios of the rehabilitated vegetation in coal mining areas were analyzed, including the effective restoration to maturity, inefficient restoration to maturity, effective restoration followed by degradation, effective restoration to development, inefficient restoration to …

Evaluation On Potential Of Using Abandoned Mines For Pumped Storage In Nine Provinces Of Yellow River Basin, Bian Zhengfu, Zhu Chaobin, Zhou Yuejin, Xu Yunong

Coal Geology & Exploration

In view of the low utilization rate of closed mine resources and the increasing demand for power and energy storage in China, the pumped storage technology of abandoned mine is an effective means to realize the secondary development and utilization of resources and enhance the peak sheaving capacity of power grid. Based on the working principle and development status of pumped storage power plants using the abandoned mines, it was proposed to build the semi-underground and full-underground pumped storage power plants using the abandoned mines in the nine provinces of Yellow River Basin. By considering the influence factors of space, …

Preparation Of Coal-Series Solid-Waste-Based Green Filling Materials And Their Performance, Dong Meng, Li Jiangshan, Chen Xin, Jin Jiaxu, Lu Longzhao

Coal Geology & Exploration

The filling technology is an important part of green mining. The low-carbon environmental-friendly filling materials with low costs in research and development and reliable performance are critical for the development of filling technologies. The coal gangue (CG) and coal-series metakaolin (MK) were adopted as the raw materials to prepare coal-series solid-waste-base green filling materials, and the effect of the mixing proportion and alkali activator on the strength and fluidity of filling materials was discussed. In combination with the X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric (TG) analysis and scanning electron microscopy/energy dispersive x-ray spectroscopy (SEM-EDS) and other characterization measures, …

Shear Characteristics And Modified Coulomb Model Of Alfalfa Root-Loess Composite, Duan Zhao, Yuan Lin, Bi Yinli, Wang Kai, Wu Yanbin, Zhang Qing

Coal Geology & Exploration

Plant roots can significantly improve the strength of soil. In order to explore the enhancement effect of alfalfa root on the shear strength of loess, study was conducted based on the root-soil composites of alfalfa with a growth period of 60 d herein. Specifically, the parameters on shear strength of the alfalfa root-soil composite and the tensile strength of alfalfa root were obtained through the direct shear tests and root tensile tests. By observing the structure and characteristics of alfalfa root with an electronic magnifier, a modified Coulomb model of root-soil composite was established with the empirical formula. Meanwhile, the …

Discussion On Identification Standard Of Coal-Measure Graphite, Cao Daiyong, Wang Lu, Zhu Wenqing, Wu Guoqiang, Wei Yingchun, Ning Shuzheng, Wang Guixiang, Xiao Jincheng, Xu Xiang, Liu Kang

Coal Geology & Exploration

The identification and classification of coal-measure graphite are the precondition and basic work of mineral geological exploration, as well as resource exploitation and utilization. The preparation of identification standards of coal-measure graphite should follow the principles of science, systematicness, applicability and operability. Coal graphitization and coalification is a continuous progression plus jump process, and the characteristics of coal-measure graphite, including the step evolution of macromolecular structure and the heterogeneity of material composition, leads to the complexity of ore identification. In order to establish the scientific and practical identification standards, and from the study of metallogenic mechanism and the demand of …

Experimental Research On Mechanical Properties Of “Jacked Pipe-Frozen Soil” Composite Structure In Freeze-Sealing Pipe Roof Tunnel, Duan Yin, Rong Chuanxin, Cai Haibing, Long Wei

Coal Geology & Exploration

As the key project of Zhuhai Connecting Line of Hong Kong‒Zhuhai‒Macao Bridge, the underground excavation section of Gongbei Tunnel has applied the freeze-sealing pipe roof method for the first time. Combining the advantages of the pipe roof method and the artificial ground freezing method, this method could form a “jacked pipe-frozen soil curtain” composite support system on the tunnel section, so as to effectively achieve the dual goals of “bearing” and “water-stopping between pipes”, thereby ensuring that stability and safety during tunnel excavation. To obtain the temperature, deformation and mechanical properties of the “jacked pipe-frozen soil” composite structure, a set …

Path Planning Of Coal Mine Rescue Robot Based On Improved A* Algorithm, Zhang Weimin, Zhang Yue, Zhang Hui

Coal Geology & Exploration

A coal mine rescue robot that performs a rescue task needs to obtain the environment model and plan a collision-free path from the current location to the target location with the built-in algorithm upon receiving a task instruction. In order to reduce the moving time of the rescue robot, the path is usually required to be time-optimal. However, the path planned by the conventional A* algorithm that is widely used at present under the grid map environment has many problems, such as many path redundancy points and large turning angle, which leads to the fact that the path is suboptimal …

Fault Diagnosis Of Hydraulic Power System For Coal Mine Tunnel Drilling Rig Based On T-S Fuzzy Fault Tree, Liu Ruojun, Zhang Youzhen, Yao Ke

Coal Geology & Exploration

In view of the problems of fuzzy logic relation between the elements of the system, the polymorphism of fault mode, and the difficulty in obtaining the fault probability as a result of the complication of the hydraulic power system for coal mine tunnel drilling rig, a fault diagnosis method of hydraulic power system for coal mine tunnel drilling rig based on Takagi-Sugeno (T-S) fuzzy tree was proposed to overcome the limitations of traditional fault tree in fault diagnosis and analysis of the complex electromechanical hydraulic equipment. The method could timely and accurately obtain the fault information of equipment, and to …

Application Of Artificial Intelligence To Lithium-Ion Battery Research And Development, Zhen-Wei Zhu, Jing-Yi Qiu, Li Wang, Gao-Ping Cao, Xiang-Ming He, Jing Wang, Hao Zhang

Journal of Electrochemistry

Lithium-ion batteries (LIBs) have become one of the best solutions to the energy storage issue in modern society. However, the battery materials and device development are both complex, and involve multivariable problems. Traditional trial-and-error approach, which relies on researchers to conduct experiments, has encountered bottlenecks in the improvement of the battery performance. Artificial intelligence (AI) is the most potential technology to deal with this issue due to its powerful high-speed and capabilities of processing massive data. In particular, the capability of machine learning (ML) algorithms in assessing multidimensional data variables and discovering patterns in the sets are expected to assist …

Advances On Composite Cathodes For Lithium-Sulfur Batteries, Xi-Yao Li, Chang-Xin Zhao, Bo-Quan Li, Jia-Qi Huang, Qiang Zhang

Journal of Electrochemistry

Lithium-sulfur (Li-S) batteries are deemed as high-promising next-generation energy storage technique due to their ultrahigh theoretical energy density, where the sulfur cathodes with high specific capacity guarantee the energy density advantage and directly determine the battery performances. After decades of exploration, the most promising sulfur cathodes are sulfur/carbon composite (S/C) cathodes and sulfurized polyacrylonitrile (SPAN) cathodes. In this manuscript, recent advances on S/C and SPAN cathodes in Li-S batteries are comprehensively reviewed. The electrochemical reaction circumstances on S/C and SPAN cathodes are firstly introduced and compared to reveal the working mechanisms of the two types of Li-S batteries. The S/C …

Multi-Electron Reaction-Boosted High Energy Density Batteries: Material And System Innovation, Rui-Qi Guo, Feng Wu, Xin-Ran Wang, Ying Bai, Chuan Wu

Journal of Electrochemistry

The continuous development of the global energy structure transformation has put forward higher demands upon the development of batteries. The improvements of the energy density have become one of the important indicators and hot topic for novel secondary batteries. The energy density of existing lithium-ion battery has encountered a bottleneck due to the limitations of material and systems. Herein, this paper introduces the concept and development of multi-electron reaction materials over the past twenty years. Guided by the multi-electron reaction, light weight electrode and multi-ion effect, current development strategies and future trends of high-energy-density batteries are highlighted from the perspective …

Carbon-Al Interface Effect On The Performance Of Ionic Liquid-Based Supercapacitor At 3 V And 65 OC, Zhen-Zhen Ye, Shu-Ting Zhang, Xin-Qi Chen, Jin Wang, Ying Jin, Chao-Jie Cui, Lei Zhang, Lu-Ming Qian, Gang Zhang, Wei-Zhong Qian

Journal of Electrochemistry

Ionic liquid (IL) electrolyte-based supercapacitors (SCs) have advantages of high operating voltage window, high energy density and nonflammability, as compared to conventional acetonitrile-based organic electrolyte SCs, and are typically suitable for the large-scale energy storage in the era of carbon neutrality full of renewable, but unstable electricity. However, current efforts were concentrated on the study with coin-cell type of IL-SCs, and less has been reported on the pouch type of IL-SCs for a long cycling time yet. To fabricate a reliable SC for the life time test or for the accelerated aging test under high temperature, one should concern the …

Preparation Of Highly-Cyclized Sulfurized Polyacrylonitrile For Lithium-Sulfur Batteries, Xuan Ji, Jia-Yu Wang, An-Bang Wang, Wei-Kun Wang, Ming Yao, Ya-Qin Huang

Journal of Electrochemistry

Sulfurized polyacrylonitrile (SPAN) is regarded as an attractive cathode candidate of lithium-sulfur (Li-S) batteries for its non-dissolution mechanism and effective alleviation of polysulfides shuttling issue in Li-S batteries, displaying high utilization of cathode active material, outstanding cycle stability and structural stability. However, the relation between cyclization degree and cycle stability of SPAN is still unveiled. In this work, SPAN-C-V composites were synthesized by co-introduction of CuSO₄ and zinc n-ethyl-n-phenyldithiocarbamate (ZDB) in the co-heating of sulfur and polyacrylonitrile. The co-introduction of CuSO₄ and ZDB reduced the cyclization reaction onset temperature of PAN while increased the C—C/C=C within SPAN-C-V, thus …

Influence Of The Preparation Technique On The Magnetic Characteristics Of Ε-Fe2o3-Based Composites, Dmitriy O. Testov, Kamil G. Gareev, Ivan K. Khmelnitskiy, Andrei Kosterov, Leonid Surovitskii, Victor V. Luchinin

Michigan Tech Publications, Part 1

ε-Fe2O3 is an iron(III) oxide polymorph attracting an increasing interest due to its unique magnetic properties combining extremely high coercivity and relatively large saturation magnetization. We review existing methods for the ε-Fe2O3 synthesis focusing on synthesis speed, repeatability, manufacturability and purity of the final product. Samples of ε-Fe2O3 have been synthesized using the two methods that appear the most promising: silica gel impregnation and microemulsion. In both cases, ε-Fe2O3 and α-Fe2O3 are present in the final product as attested by X-ray diffraction patterns and magnetic properties (maximum coercive force at 300 K~1 Tesla). Two different precursors, iron(III) nitrate and iron(II) …

Multipolymer Microsphere Delivery Of Sars-Cov-2 Antigens, Farah Shahjin, Milankumar Patel, Jatin Machhi, Jacob D. Cohen, Mohammad Ullah Nayan, Pravin Yeapuri, Chen Zhang, Emiko Waight, Mahmudul Hasan, Mai Mohamed Abdelmoaty, Prasanta K. Dash, You Zhou, Irene Andreu, Howard E. Gendelman, Bhavesh D. Kevadiya

Nebraska Center for Biotechnology: Faculty and Staff Publications

Effective antigen delivery facilitates antiviral vaccine success defined by effective immune protective re- sponses against viral exposures. To improve severe acute respiratory syndrome coronavirus-2 (SARS-CoV- 2) antigen delivery, a controlled biodegradable, stable, biocompatible, and nontoxic polymeric micro- sphere system was developed for chemically inactivated viral proteins. SARS-CoV-2 proteins encapsulated in polymeric microspheres induced robust antiviral immunity. The viral antigen-loaded microsphere sys- tem can preclude the need for repeat administrations, highlighting its potential as an effective vaccine.

Temporal Changes In Extracellular Vesicle Hemostatic Protein Composition Predict Favourable Left Ventricular Remodeling After Acute Myocardial Infarction, Xiong Chang Lim, Chenyuan Huang, Siti Maryam J.M. Yatim, Suet Yen Chong, Sock Hwee Tan, Xiaoxun Yang, Caryn L. Heidt, Jodi Pedersen, Michael Talanker, Harshvardhan Modh, Matthias G. Wacker, Giorgia Pastorin, Siew Pang Chan, A. Mark Richards, Chris J. Charles, Mark Y. Chan, Jiong Wei Wang

Michigan Tech Publications, Part 1

The subset of plasma extracellular vesicles (EVs) that coprecipitate with low-density lipoprotein (LDL-EVs) carry coagulation and fibrinolysis pathway proteins as cargo. We investigated the association between LDL-EV hemostatic/fibrinolysis protein ratios and post-acute myocardial infarction (post-AMI) left ventricular (LV) remodeling which precedes heart failure. Protein concentrations of von Willebrand factor (VWF), SerpinC1 and plasminogen were determined in LDL-EVs extracted from plasma samples obtained at baseline (within 72 h post-AMI), 1 month and 6 months post-AMI from 198 patients. Patients were categorized as exhibiting adverse (n = 98) or reverse (n = 100) LV remodeling based on changes in LV end-systolic volume …

Determining Kinetic Parameters Of Cellulose And Lignin Pyrolysis By Gaussian Process Regression (Gpr) Method, Pichayaporn Viriya-Amornkij, Kazunori Kuwana

Progress in Scale Modeling, an International Journal

The ignition and flame-spread processes in the forest and urban fires involve the pyrolysis reactions of biomass materials. One of the most common methods for estimating the fire performance of a material is the evaluation of kinetic parameters, i.e., activation energy (𝐸), pre-exponential factor (𝐴), and reaction model (𝑓(𝛼)), from thermogravimetric analysis (TG) data. Typically, 𝐸 is estimated based on an Arrhenius-type equation such as Kissinger, Kissinger-Akahira-Sunose (KAS), and Friedman equations. Then, its value is adjusted along with other parameters by assuming a reaction model, e.g., the 𝑛-order model. This study proposes a Gaussian process regression (GPR) method to determine …

Fire-Resistance Testing Procedures For Construction Elements—A Review, Shashikant Chaturvedi, Ajitanshu Vedrtnam, Maged A. Youssef, Martin T. Palou, Gonzalo Barluenga, Kishor Kalauni

Civil and Environmental Engineering Publications

Fire accidents are a significant risk to human life and civil infrastructure. As a countermeasure, the regulatory bodies of different countries have established standards for evaluating the performance of construction elements during fire exposure. ISO 834 is the globally accepted fire-resistance testing standard. Other standards include ASTM E119, BS 476, IS 3809, JIS A 1304, AS 1503, EN 1363, and GB/T 9978, which are utilized by the US, Britain, India, Japan, Australia, Europe, and China, respectively. This article presents a summary and comparison of the fire-resistance testing standards. In reality, standard tests for isolated structural members may not efficiently portray …

30 Años De Transformación Regional. Soacha, Jesús Enrique Pabón Quintero, Claudia Sofía González Sánchez, Catalina Ramírez Machado, Edwar Javier Prieto Suárez, Eduar Alonso Ceballos Bernal, Yury Julieth Garzón Rodríguez, Diana Karina López Carreño, Micher Alexander González Monroy, Yudy Amparo Narváez Vallejo, Dilia Inés Molina Cubillos, Rubén Dario Rodríguez Useche

Institucional

El presente libro contiene simplificadamente, la reseña histórica de la Universidad de Cundinamarca, Extensión Soacha, la cual hace referencia desde su nacimiento hasta los avances, transformaciones e impactos que ha generado no solo en el municipio de Soacha, sino municipios como Sibaté, Funza, Mosquera y la misma capital del País, Bogotá. Incluye además la oferta académica y la contribución e implementación del Modelo Educativo Digital Transmoderno - MEDIT en la Extensión. De igual manera cuenta con los capítulos relacionados con la Ciencia, Tecnología e Innovación del programa de Ciencias del Deporte y la Educación Física desde el MEDIT; el cual …

30 Años De Transformación Regional. Chía Y Zipaquirá, José Zacarías Mayorga Sánchez, Luz Deicy Flórez Espinal, Viviana Andrea Caballero Moreno, Luz Mireya Rincón Mora, John Jairo Zambrano Rocha, Eduard Neftali Gutiérrez, Carlos Augusto Trujillo Padilla, Carlos Germán González Pedraza, Juan Manuel Urrego Laurin, León Fabio Salcedo Ortiz, Ana Betina Morgante Combariza, Eduardo Ernesto Castro Neira

Institucional

En el trigésimo aniversario de vida universitaria de nuestro claustro académico, la Extensión Chía, recordamos con agrado el proceso desarrollado en esta corta pero muy exitosa actividad universitaria. Conocida como la ciudad de La Luna, el municipio de Chía es un importante centro empresarial e industrial del departamento de Cundinamarca, sede de varias instituciones de educación superior. Hoy es un referente de primer orden el proceso de desarrollo económico y social que ha atravesado la provincia Sabana Centro, en especial, debido a la cercanía a la capital del país. Es un centro cultural y turístico por excelencia con una rica …

Two Sides To Every Psyche: Implications Of Positive Psychology For "Mental Health" Research In Engineering Education, Muhammad Asghar, Angela Minichiello

Engineering Education Student Research

“Mental Health.” Throughout the 20th century, these familiar words have been quietly commandeered by a physiological model of health (Greenspoon & Saklofske, 2001). Unknowingly, society conspired to use these words—colloquially, academically, and scientifically—for the sole purpose of depicting (or implying) negative states of the human mind. Since the origins of psychological research over 100 years ago, our understanding of what mental health is has been conflated with notions of mental illness. Resultantly, we have tacitly agreed that the presence or absence of suffering is the sole implication of our mental health (Horwitz & Scheid, 1999).

Emergence Of Coherent Backscattering From Sparse And Finite Disordered Media, Nooshin M. Estakhri, Nasim Mohammadi Estrakhri, Theodore B. Norris

Engineering Faculty Articles and Research

Coherent backscattering (CBS) arises from complex interactions of a coherent beam with randomly positioned particles, which has been typically studied in media with large numbers of scatterers and high opacity. We develop a first-principles scattering model for scalar waves to study the CBS cone formation in finite-sized and sparse random media with specific geometries. The current study provides insights into the effects of density, volume size, and other relevant parameters on the angular characteristics of the CBS cone emerging from sparse and bounded random media for various types of illumination, with results consistent with well-known CBS studies which are typically …

Using Naming Conventions To Facilitate Data Transfer Between Asset Management Systems And Building Information Models, John D. Foster

Theses and Dissertations

An improvement to the workflow developed by Loeh et al. (2021) is proposed using a Revit template with BUILDER SMS naming conventions when creating the Sustainable Facility Management-enhanced BIM Model. The method presented by Loeh et al. (2021) is modified by integrating BUILDER SMS parameters and naming conventions into the BIM model during, as opposed to after, the creation of the model. Four building models created in 2020-21, four from 2021-22, and one building from 2019 were used in this study. Two groups of students were used to evaluate the effect of the building-specific BIM templates. Evaluating the 2020 and …

Design, Concept, And Visualization Of Urban Multi-Level Growing Table Systems In Hyper Urban Areas, Aaryan Manoj Nair, Shaheed Mohammed, Omar Rahama

Publications and Research

As of a 2019 study conducted by the National Urban Gardening Program (National Urban Gardening Program), urban farming accounts for approximately 19% of the total national farming output and is expected to triple to almost 45% by 2025. There is intensive research being conducted on aspects of reduced recidivism, communal health benefits, natural carbon capture systems, improved urban ecology and the necessity for reducing the carbon footprint of food, (informally dubbed “food miles”) there is little substantive research on optimisation, and maximation of crop productivity in hyper-urban areas.

The purpose of this report is to understand the functionalities of urban …

Emulating Future Neurotechnology Using Magic, Jay A. Olson, Mariève Cyr, Despina Z. Artenie, Thomas Strandberg, Lars Hall, Matthew L. Tompkins, Amir Raz, Petter Johansson

Psychology Faculty Articles and Research

Recent developments in neuroscience and artificial intelligence have allowed machines to decode mental processes with growing accuracy. Neuroethicists have speculated that perfecting these technologies may result in reactions ranging from an invasion of privacy to an increase in self-understanding. Yet, evaluating these predictions is difficult given that people are poor at forecasting their reactions. To address this, we developed a paradigm using elements of performance magic to emulate future neurotechnologies. We led 59 participants to believe that a (sham) neurotechnological machine could infer their preferences, detect their errors, and reveal their deep-seated attitudes. The machine gave participants randomly assigned positive …