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Full-Text Articles in Engineering

Preface To The Special Issue On Lithium-Sulfur Batteries, Jia-Jia Chen, Ren-Jie Chen, Zhong Jin Apr 2023

Preface To The Special Issue On Lithium-Sulfur Batteries, Jia-Jia Chen, Ren-Jie Chen, Zhong Jin

Journal of Electrochemistry

No abstract provided.

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Threshold Segmentation Method Of Ct Scanning Data Of Coal And Rock Samples Considering Beam Hardening Effect And Its Application, Wang Kai, Fu Qiang, Xu Chao, Ai Zibo, Wang Lei, Shu Longyong Apr 2023

Threshold Segmentation Method Of Ct Scanning Data Of Coal And Rock Samples Considering Beam Hardening Effect And Its Application, Wang Kai, Fu Qiang, Xu Chao, Ai Zibo, Wang Lei, Shu Longyong

Coal Geology & Exploration

Beam hardening is a common phenomenon in the application of industrial computerized tomography (ICT). It can cause different grayscale values in components with the same density, which affects the threshold segmentation and later reconstruction of components seriously. Herein, study was conducted on the distribution law of grayscale values under the effect of beam hardening, so as to segment the CT scanning data of coal and rock samples under the beam hardening effect accurately. Through the study, it is found that the change in grayscale value on the grayscale beam could truly reflect the change in component density, which is proved …

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Sedimentary Coal-Controlling Effect And Coal-Forming Model Of Paleogene Coal Measures In Paralic Faulted Basin：A Case Study Of Huangxian Basin, Shandong Province, Wu Yue, Wang Dongdong, Wang Hailiang, Liu Haiyan, Li Zengxue, Zheng Xue Apr 2023

Sedimentary Coal-Controlling Effect And Coal-Forming Model Of Paleogene Coal Measures In Paralic Faulted Basin：A Case Study Of Huangxian Basin, Shandong Province, Wu Yue, Wang Dongdong, Wang Hailiang, Liu Haiyan, Li Zengxue, Zheng Xue

Coal Geology & Exploration

There are abundant coal-type oil and gas resources in Chinese sea area, but few researches have been conducted on the coal-type source rock, which seriously restricts the exploration of coal-type oil and gas resources in the sea area. Herein, this study on sedimentary coal-controlling effect and coal-forming model was carried out based on Huangxian Basin that is a paralic faulted basin with same coal-forming period, similar geological conditions and high degree of research for the coal basins in the sea area. Specifically, the pattern, evolution and sedimentary coal-controlling effect of paleogeography during the coal-forming period were reconstructed with full consideration …

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Deterioration Characteristics Of Water-Rock Interaction On Combustion Metamorphic Rocks In Northern Shaanxi, Hu Xin, Sun Qiang, Yan Changgen, Zhao Chunhu, Wang Shaofei Apr 2023

Deterioration Characteristics Of Water-Rock Interaction On Combustion Metamorphic Rocks In Northern Shaanxi, Hu Xin, Sun Qiang, Yan Changgen, Zhao Chunhu, Wang Shaofei

Coal Geology & Exploration

There are a lot of combustion metamorphic (CM) rocks formed by high temperature baking of coal fires in the border area of Shaanxi, Shanxi and Inner Mongolia in the northeastern margin of Ordos Basin. Compared with the virgin rock, the rock mass subjected to combustion metamorphism is broken in structure, with pores developed, and a large number of dangerous rock masses are formed under the long-term water-rock interaction. Herein, 50 dry-wet cycle experiments were carried out with the CM rocks in Daliuta Area of Shenmu in Shaanxi Province. Meanwhile, the changes in the physical and mechanical properties of CM rocks …

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Ecological Natural Restoration And Its Artificial Promotion Mode In Coal Mining Area, Liu Wei, Yin Qinrui, Liu Xianghong Apr 2023

Ecological Natural Restoration And Its Artificial Promotion Mode In Coal Mining Area, Liu Wei, Yin Qinrui, Liu Xianghong

Coal Geology & Exploration

The natural ecological restoration is an important direction of the national ecological restoration policy. Taking limited artificial measures to promote the natural ecological restoration in coal mining areas is in line with the actual engineering requirements under the context of "double carbon" goal and thus has a better prospect in market application. Herein, the research results in terms of natural ecological restoration were sorted out systematically for the three main types of damaged land in the coal mining areas. Meanwhile, the concept connotation of artificial promotion of natural restoration was studied and analyzed. Besides, the governance mode by zone and …

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Hydrochemical Characteristics And Source Analysis Of Mine Water In Shallow Coal Seams In Shaanxi And Inner Mongolia Contiguous Area, Wang Yutong, Wang Hao, Wang Tiantian, Xue Jiankun, Shang Hongbo, Zhou Zhenfang Apr 2023

Hydrochemical Characteristics And Source Analysis Of Mine Water In Shallow Coal Seams In Shaanxi And Inner Mongolia Contiguous Area, Wang Yutong, Wang Hao, Wang Tiantian, Xue Jiankun, Shang Hongbo, Zhou Zhenfang

Coal Geology & Exploration

In order to study the hydrochemical characteristics and sources of mine water under the mining of shallow coal seams in the contiguous area of Inner Mongolia and Shaanxi, the hydrochemical characteristics and the formation action of mine water in this area were investigated through the study of hydrochemical characteristics, mathematical statistics, ion ratio coefficient method and the hydrogen and oxygen isotopes in combination, by collecting samples of the mine water, groundwater in different aquifers and surface water in the study area. Based on this, the main sources of mine water in the study area were identified. The results show that …

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Visco-Elastic Full-Waveform Inversion Based On Multi-Objective Function, Liang Xu, Ma Yue, Liu Chao, Chen Zhen, Jia Dongdong, Li Zhiyong, Pan Wenyong Apr 2023

Visco-Elastic Full-Waveform Inversion Based On Multi-Objective Function, Liang Xu, Ma Yue, Liu Chao, Chen Zhen, Jia Dongdong, Li Zhiyong, Pan Wenyong

Coal Geology & Exploration

Full-waveform inversion (FWI) is one of the core technologies developed in exploration geophysics. Through FWI, the subsurface velocity structures can be constructed and the attenuation parameter (the quality factor Q) model can be inverted, which is helpful to characterize the types and structures of subsurface media (such as the fluid and collapse column in collapse column). This is significant for the exploration and development of natural resources such as coal, oil and gas. Parameter crosstalk is the key difficulty of visco-elastic FWI. Due to the influences of velocity errors, the inverted Q models contain very strong crosstalk noise. To …

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Design Of Multi-Channel Continuous Cable Duct For Double-Bit Self-Balancing Drilling System, Zhao Yan, Ai Hongxin, Gao Ke, Zhang Congshan, Lyu Xiaoshu, Xie Xiaobo Apr 2023

Design Of Multi-Channel Continuous Cable Duct For Double-Bit Self-Balancing Drilling System, Zhao Yan, Ai Hongxin, Gao Ke, Zhang Congshan, Lyu Xiaoshu, Xie Xiaobo

Coal Geology & Exploration

The problems, such as low drilling efficiency, large disturbance to the hole wall and long assistance time of tripping caused by the “long arm jurisdiction” drive of the ground drilling rig to the underground drill bit, are faced during the drilling rescue of mine disaster. In order to solve these problems, the bionic self-balancing continuous cable duct drilling technology of double drill bit without drilling rig was proposed, the design of the multi-function continues cable duct is one of the key and challenging aspects of this technology. In terms of the technology, a multi-functional continuous cable duct with built-in channels …

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Development Of A Biobased Carbon Adsorbent For Treating Emerging Contaminants In Recycled Water On The International Space Station, Savanna Vacek, Madeline Carroll, Gabson Baguma Apr 2023

Development Of A Biobased Carbon Adsorbent For Treating Emerging Contaminants In Recycled Water On The International Space Station, Savanna Vacek, Madeline Carroll, Gabson Baguma

Undergraduate Research Symposium Posters

The International Space Station (ISS) operates as a closed system. Water is recycled from humidity and urine and held in a wastewater tank; part of the Water Processing Assembly (WPA). Potable treated water is used indirectly in the Sabatier Reactor.The Sabatier Reactor is a key component in the Environmental Control and Life Support System (ECLSS). Three main functions of ECLSS: water recovery, air revitalization, and oxygen generation Sabatier Reactor recently failed due to contamination of DMSO2, dimethyl sulfone, and DMSD, dimethylsilanediol. DMSO2 and DMSD are emerging contaminants that are not removed by the media used in the WPA due to …

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Cobalt/Carbon Composites As Sulfur Hosts For High-Performance Lithium-Sulfur Batteries, Yun-Rui Yang, Huan-Huan Dong, Zhi-Qiang Hao, Xiang-Xi He, Zhuo Yang, Lin Li, Shu-Lei Chou Apr 2023

Cobalt/Carbon Composites As Sulfur Hosts For High-Performance Lithium-Sulfur Batteries, Yun-Rui Yang, Huan-Huan Dong, Zhi-Qiang Hao, Xiang-Xi He, Zhuo Yang, Lin Li, Shu-Lei Chou

Journal of Electrochemistry

Lithium-sulfur (Li-S) battery is one of the promising energy storage devices because of its high energy density. However, the sulfur cathode suffers from sluggish electrochemical reaction kinetics, slow charge transfer, large volume expansion and severe shuttle effect of lithium polysulfides inevitably resulting in low reversible capacity, poor rate performance and short cycle life, limiting its practical applications. Herein, the recent progress of cobalt/carbon composites, including cobalt nanoparticles and cobalt single atoms, as the sulfur host materials in Li-S batteries is overviewed. In general, cobalt plays the role of electrocatalyst, which inhibits the shuttle effect of lithium polysulfides, accelerates the electrochemical …

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Recent Advances Of Functional Electrolyte Additives For Lithium-Sulfur Batteries, Xiu-Qing Zhang, Shuai Tang, Yong-Zhu Fu Apr 2023

Recent Advances Of Functional Electrolyte Additives For Lithium-Sulfur Batteries, Xiu-Qing Zhang, Shuai Tang, Yong-Zhu Fu

Journal of Electrochemistry

Lithium-sulfur (Li-S) batteries have become one of the most promising next-generation battery systems due to their high energy density and low cost. However, the application of Li-S batteries still faces critical challenges, such as the low conductivities of S and Li2S, shuttle effect of polysulfides and dendrite growth of Li, etc. The optimization of the electrolyte can ameliorate the electrolyte|electrode interphase, conveniently regulating the parasitic reaction and improving the performance of the resultant batteries. The functional additives in electrolytes provide chances to tune the interphase and even the redox mechanism to improve the performance of the batteries. In …

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Metals And Alloys As Catalytic Hosts Of Sulfur Cathode For Lithium-Sulfur Batteries, Zhen-Yu Wang, Xue-Ping Gao Apr 2023

Metals And Alloys As Catalytic Hosts Of Sulfur Cathode For Lithium-Sulfur Batteries, Zhen-Yu Wang, Xue-Ping Gao

Journal of Electrochemistry

Lithium-sulfur batteries are recognized as one of the most promising next-generation energy storage devices, owing to the high theoretical energy density of 2600 Wh·kg–1. However, their application has been seriously hindered by the sluggish electrochemical reaction kinetics of elemental sulfur and discharged products (Li2S2/Li2S), and the notorious “shuttle effect” of soluble intermediate lithium polysulfide species, leading to poor cycle stability, low sulfur utilization and inferior coulombic efficiency. Introducing catalytic hosts into sulfur cathode is an efficient path to propel the conversion of sulfur-contained species, thus preventing the dissolution and loss of active-sulfur …

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Ultraviolet-Initiated In-Situ Cross-Linking Of Multifunctional Binder Backbones Enables Robust Lithium-Sulfur Batteries, Sha Li, Xiao Zhan, Gu-Lian Wang, Hui-Qun Wang, Wei-Ming Xiong, Li Zhang Apr 2023

Ultraviolet-Initiated In-Situ Cross-Linking Of Multifunctional Binder Backbones Enables Robust Lithium-Sulfur Batteries, Sha Li, Xiao Zhan, Gu-Lian Wang, Hui-Qun Wang, Wei-Ming Xiong, Li Zhang

Journal of Electrochemistry

Lithium-sulfur (Li-S) batteries show attractive prospects owing to their high theoretical energy density, but their commercialization still faces such challenges as lithium polysulfides shuttling, severe volume change and considerable polarization. These stubborn issues place higher demands on each component in the battery, such as the development of multifunctional binders with superior mechanical properties. Herein, ethoxylated trimethylolpropane triacrylate was firstly introduced into sulfur cathodes, and in-situ cross-linked by ultraviolet (UV) curing combined with traditional polyvinylidene difluoride binder (i.e., forming a binary binder, denoted as c-ETPTA/PVDF) to construct high-loading and durable Li-S batteries. The covalently cross-linked ETPTA framework not only significantly enhances …

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A Preliminary Evaluation Method For Coal-Based Graphite, Liu Kang, Ning Shuzheng, Cao Daiyong, Wu Guoqiang, Wang Lu, Lin Zhongyue, Wang Anmin Apr 2023

A Preliminary Evaluation Method For Coal-Based Graphite, Liu Kang, Ning Shuzheng, Cao Daiyong, Wu Guoqiang, Wang Lu, Lin Zhongyue, Wang Anmin

Coal Geology & Exploration

Coal-based graphite is a type of strategic mineral resource and has unique advantages in the fields such as nuclear graphite and military aircraft tires. The evaluation of coal-based graphite is crucial to its exploration and development, upgrading and storage increase, and strategic resource security. Owing to the continuous transition between coal-based graphite and highly metamorphosed coals, some coal-based graphite tends to be wrongly treated as blind coal, and, accordingly, the identified resources of existing coal-based graphite may have been greatly underestimated. In fact, the resources of coal-based graphite are directly related to those of high-rank coals. Therefore, it is significant …

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Study On Methane Adsorption/Desorption And Flow Law In The Nanopores Of Coal Based On Lammps, Shi Yu, Liu Yang, Xue Junhua, Li Shugang, Zhang Chao Apr 2023

Study On Methane Adsorption/Desorption And Flow Law In The Nanopores Of Coal Based On Lammps, Shi Yu, Liu Yang, Xue Junhua, Li Shugang, Zhang Chao

Coal Geology & Exploration

In this work, the influence rules of driving force, pore size, temperature and pressure on methane adsorption/desorption and flow in coal nanopores were investigated by the molecular dynamic method based on Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS). The investigation results show that the viscosity of methane gradually decreases with the increasing driving force, while its fluidity and flow velocity increase. Meanwhile, the absolute slip length decreases and the flow tends to the non-slip state. Generally, the adsorption density of methane is independent of the driving force, but greatly affected by the gas-solid action. Methane can be adsorbed on the pore …

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Application Of Ecological Geological Layer Theory In Coal Seam Protection And Ecological Restoration—An Example Of Ecological Management Practice In Plateau Alpine Mining Areas, Wang Qingwei, Xing Xiafan, Zou Mingjun, Guo Biao, Zhao Xin, Wang Tong Apr 2023

Application Of Ecological Geological Layer Theory In Coal Seam Protection And Ecological Restoration—An Example Of Ecological Management Practice In Plateau Alpine Mining Areas, Wang Qingwei, Xing Xiafan, Zou Mingjun, Guo Biao, Zhao Xin, Wang Tong

Coal Geology & Exploration

The ecological management of alpine permafrost area in plateau is a global problem, with few precedents for coal resource protection while ecological management. In this paper, the following results achieved in the ecological management in Muli area of Qinghai Province were understood in accordance with the idea of systematic engineering for the purpose of ecological environmental protection, with consideration to the protection of residual coal resources. Specifically, study was conducted on the ecological vulnerability of Muli mining area to damage and the difficulty of restoration under the control of natural climatic characteristics. Meanwhile, the characteristics of soil erosion and vegetation …

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Processing Of Coal Mine Csamt Data With Wide Field Electromagnetic Method, Zhu Yunqi, Li Diquan, Liu Zuiliang, Zhang Xin Apr 2023

Processing Of Coal Mine Csamt Data With Wide Field Electromagnetic Method, Zhu Yunqi, Li Diquan, Liu Zuiliang, Zhang Xin

Coal Geology & Exploration

A CSAMT detection test was carried out for a coal mine with V8 multi-functional electrical instrument. Due to the serious electromagnetic interference within the area, the Cagniard apparent resistivity was low in quality. In order to improve the quality and utilization rate of data, authors attempted to process the CSAMT data collected by V8 with the wide field electromagnetic method, which used single-component method and ratio method (Electric field divided by magnetic field) to calculate apparent resistivity. The results showed that there was some deviation between the single-component wide field apparent resistivity and the actual terrestrial electricity because the emission …

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Experimental Study On Heat Transfer Performance Of Double U-Shaped Buried Tube Heat Exchanger, Li Lei, Zhang Weidong, Xu Shuanhai, Zhao Yongzhe, Dang Dongsheng, Wang Qilong, Gou Li, Lei Yanzi Apr 2023

Experimental Study On Heat Transfer Performance Of Double U-Shaped Buried Tube Heat Exchanger, Li Lei, Zhang Weidong, Xu Shuanhai, Zhao Yongzhe, Dang Dongsheng, Wang Qilong, Gou Li, Lei Yanzi

Coal Geology & Exploration

Double U-shaped buried tube heat exchanger (DUBTHE) are prone to pipe crossing and thermal short-circuiting in the practical applications, resulting in the reduced heat transfer performance and directly affecting the operational efficiency of shallow geothermal heat pump system. Based on the initial line thermal average temperature, thermal conductivity theory and slope method, and taking a shallow geothermal heat pump project in Xi'an as the engineering background. Then, this study investigate the effects of initial average temperature, thermal conductivity and volumetric heat capacity of rock-soil, and tube clamp spacing on the heat transfer performance of DUBTHE through field geotechnical thermal response …

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Quality Assessment Of Resistivity Monitoring Data Of Coal Mines, Cui Weixiong, Yuan Bo Apr 2023

Quality Assessment Of Resistivity Monitoring Data Of Coal Mines, Cui Weixiong, Yuan Bo

Coal Geology & Exploration

Resistivity monitoring of coal mines is an important technical means of preventing water hazards on the roof and floor of a mining face. However, it is difficult to guarantee high-quality resistivity data monitored and collected due to the complex and extremely strong electromagnetic interference in the monitoring environment, as well as the limitations of the maximum emission current for the purpose of safe coal mining. To select and utilize highly reliable data from the massive data monitored daily, this study compared and analyzed the advantages and disadvantages of commonly used methods for quality assessment of data obtained using the DC …

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Key Technology Of Automatic Loading And Unloading System For Dual-Pipe Directional Drilling Rig And Its Application In Soft–Fragmentized Coal Seam, Li Kun, Ting Ren, Yao Yafeng Apr 2023

Key Technology Of Automatic Loading And Unloading System For Dual-Pipe Directional Drilling Rig And Its Application In Soft–Fragmentized Coal Seam, Li Kun, Ting Ren, Yao Yafeng

Coal Geology & Exploration

To improve the automatic level and efficiency of loading and unloading of drilling rigs during the construction of dual-pipe directional drilling, an automatic loading and unloading device of dual pipe was developed to realize the fully automatic loading and unloading of drilling rigs under different working conditions and to solve the technical problems of loading and unloading the drill pipes and casing simultaneously during the dual-pipe directional drilling. Meanwhile, the device structure and control system was designed to restrict the load applied to the device during construction with the end-compliant technique. Besides, the key boundary conditions of the control program …

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Effects Of Mos2 On The Matrix Performance Of Hot-Pressed Fe-Based Diamond Drill Bit, Zhang Wenjiao, Tan Songcheng, Pan Bingsuo, Jin Xin, Kong Xiangqing, Long Shanglin Apr 2023

Effects Of Mos2 On The Matrix Performance Of Hot-Pressed Fe-Based Diamond Drill Bit, Zhang Wenjiao, Tan Songcheng, Pan Bingsuo, Jin Xin, Kong Xiangqing, Long Shanglin

Coal Geology & Exploration

Diamond drill bit is a common rock breaking tool in various exploration works, but the diamond in drill bit has poor thermal stability. As heat is constantly generated during the drilling process, the self-cooling of diamond drill bit under the condition of drought and water shortage is very important to improve the drilling efficiency. In order to decrease the friction coefficient between bit matrix and rock interface under dry drilling condition and reduce the thermal damage of diamond during drilling, molybdenum disulfide (MoS2) was added into the Fe-based diamond bit matrix, and research was performed for the effects …

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Study On Construction Of Microbial Solid-Free Drilling Fluid System And Its Borehole Wall Enhancement Mechanism, Li Zhijun, Zhu Mao, Zhi Jingzi, Han Yi, Chen Junxiu, Zhao Gan Apr 2023

Study On Construction Of Microbial Solid-Free Drilling Fluid System And Its Borehole Wall Enhancement Mechanism, Li Zhijun, Zhu Mao, Zhi Jingzi, Han Yi, Chen Junxiu, Zhao Gan

Coal Geology & Exploration

Broken formations are often encountered during drilling, which is prone to the instability of wellbore wall and induces serious downhole accidents. Enhancing the cementing force between the broken blocks and improving the mechanical strength of the surrounding rocks of a wellbore is one of the effective ways to solve the instability of wellbore in this type of formation, for which the microbially induced calcite precipitation (MICP) technology provides a good reference. To this end, the growth of Bacillus pasteurii in the solid-free drilling fluid system was analyzed through experimental study, and thus a solid-free drilling fluid suitable for its growth …

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Analysis Impact Of Intrinsic And Extrinsic Motivation On Job Satisfaction In Logistics Service Sector: An Intelligent Neutrosophic Model, Zenat Mohamed, Mahmoud M. Ismail, Amal F. Abd El-Gawad Apr 2023

Analysis Impact Of Intrinsic And Extrinsic Motivation On Job Satisfaction In Logistics Service Sector: An Intelligent Neutrosophic Model, Zenat Mohamed, Mahmoud M. Ismail, Amal F. Abd El-Gawad

Neutrosophic Systems with Applications

The success of every company relies heavily on the happiness of its workforce, and the logistics service sector is no exception. The capacity of logistics suppliers to satisfy the demands of their clients depends on the efficiency and efficacy of operations, which in turn is affected by the level of employee satisfaction. This paper aims to analyze the factors of employee satisfaction in the logistic service industry to achieve productivity and a satisfied workforce. This paper used the multi-criteria decision-making (MCDM) methodology to handle various factors. The SWARA method is an MCDM method used to compute the importance of factors. …

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Optical Fiber Tip Micro Anemometer, Jeremiah C. Williams, Hengky Chandrahalim Apr 2023

Optical Fiber Tip Micro Anemometer, Jeremiah C. Williams, Hengky Chandrahalim

AFIT Patents

A passive microscopic flow sensor includes a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fiber. The three-dimensional microscopic optical structure includes a post attached off-center to and extending longitudinally from the cleaved tip of the optical fiber. A rotor of the three-dimensional microscopic optical structure is received for rotation on the post. The rotor has more than one blade. Each blade has a reflective undersurface that reflects a light signal back through the optical fiber when center aligned with the optical fiber, the blades of the rotor shaped to rotate at a rate related to …

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Analysis Impact Of Intrinsic And Extrinsic Motivation On Job Satisfaction In Logistics Service Sector: An Intelligent Neutrosophic Model, Zenat Mohamed, Mahmoud M. Ismail, Amal F. Abd El-Gawad Apr 2023

Analysis Impact Of Intrinsic And Extrinsic Motivation On Job Satisfaction In Logistics Service Sector: An Intelligent Neutrosophic Model, Zenat Mohamed, Mahmoud M. Ismail, Amal F. Abd El-Gawad

Neutrosophic Systems with Applications

The success of every company relies heavily on the happiness of its workforce, and the logistics service sector is no exception. The capacity of logistics suppliers to satisfy the demands of their clients depends on the efficiency and efficacy of operations, which in turn is affected by the level of employee satisfaction. This paper aims to analyze the factors of employee satisfaction in the logistic service industry to achieve productivity and a satisfied workforce. This paper used the multi-criteria decision-making (MCDM) methodology to handle various factors. The SWARA method is an MCDM method used to compute the importance of factors. …

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Reducing Restaurant Inventory Costs Through Sales Forecasting, Tyler Mason, Chris Schoen, Trevor Gilbert, Jonathan Enriquez Apr 2023

Reducing Restaurant Inventory Costs Through Sales Forecasting, Tyler Mason, Chris Schoen, Trevor Gilbert, Jonathan Enriquez

Senior Design Project For Engineers

Family Restaurant is a local restaurant in the greater Atlanta area that serves a variety of dishes that include an assortment of 19 different proteins. Currently, Family Restaurant places protein orders based on business intuition, and tends to over-stock and sometimes under-stock. To minimize inventory costs by reducing over-stocking and preventing under-stocking of proteins, we applied Facebook Prophet (FB Prophet), ARIMA, and XG Boost machine learning models to predict protein demand and then fed these results into a Fixed Time Period inventory model to make an overall order suggestion based on the specified time period. We trained our models on …

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The Influence Of Diamine Curing Additives On The Network Architecture Of Phthalonitrile Thermosetting Polymers, Tyler J. Richardson Apr 2023

The Influence Of Diamine Curing Additives On The Network Architecture Of Phthalonitrile Thermosetting Polymers, Tyler J. Richardson

Dissertations

Phthalonitrile monomers undergo diamine-promoted polymerization by a complex reaction mechanism involving two competitive cure pathways, forming two primary network architectures: linear polyisoindoline chains and branched triazine crosslinks. The influence of the diamine curing additive on the polymerization pathway, and the influence of the resulting network architectures on cured network properties, have not been adequately explored within the phthalonitrile field. Two structurally different diamine curing additives, bis[4-(3-aminophenoxy)phenyl] sulfone (mBAPS) and 1,3-phenylenebis((4-(4-aminophenoxy)phenyl)methanone) (AEK-134), were studied for the polymerization of resorcinol phenylphosphate phthalonitrile (RPPhPN), where the influence of diamine structure and concentration on the polymerization behavior, network architecture, and bulk thermal and thermomechanical …

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The Santa Clara, 2023-04-21, Santa Clara University Apr 2023

The Santa Clara, 2023-04-21, Santa Clara University

The Santa Clara

No abstract provided.

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Progress And Reflection Of Intelligent Geological Guarantee Technology In Coal Mining Face, Wang Guofa, Zhang Jianzhong, Xue Guohua, Liu Zaibin, Liu Qing, Li Mei, Liu Junfeng, Cheng Jian, Zhang Xueliang Apr 2023

Progress And Reflection Of Intelligent Geological Guarantee Technology In Coal Mining Face, Wang Guofa, Zhang Jianzhong, Xue Guohua, Liu Zaibin, Liu Qing, Li Mei, Liu Junfeng, Cheng Jian, Zhang Xueliang

Coal Geology & Exploration

Coal mine geological guarantee technology is the key path to achieve accurate and green coal mining. In view of the requirements of intelligent mining and geological guarantee, the main problems faced by the geological guarantee of the mining face were analyzed, mainly including the weak basic theoretical research, insufficient geological exploration accuracy, modeling accuracy unable to meet the engineering application, difficulties in model dynamic updating, and lack of optimal decision-making means for global path of intelligent mining based on spatio-temporal evolution. According to the faced difficulties and technical status, the author explored and practiced the geological guarantee technology of intelligent …

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Electromagnetic Methods In The Detection Of Water Hazards In Coal Mines: A Review, Zhang Jifeng, Sun Naiquan, Liu Zuiliang, Qi Zhipeng Apr 2023

Electromagnetic Methods In The Detection Of Water Hazards In Coal Mines: A Review, Zhang Jifeng, Sun Naiquan, Liu Zuiliang, Qi Zhipeng

Coal Geology & Exploration

Water hazards in coal mines are a major type of hidden danger in safe coal mining. The accurate detection of hidden factors to cause hazard is the prerequisite to solving the water hazards. Electromagnetic methods, which are sensitive to low-resistivity bodies and have multiple types and high adaptability, can be used to effectively detect water-rich hazard-causing factors. Traditional ground electromagnetic methods, including the controlled source audio-frequency magnetotellurics (CSAMT) method and the loop source transient electromagnetic method, play an important role in detecting hidden hazard-causing factors in coal mines. With the continuous development of new technologies, near-source electromagnetic methods have developed …

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