Engineering Commons^™

Synthesis And Electrochemical Study Of Cuau Nanodendrites For Co2 Reduction, Dylan Siltamaki, Shuai Chen, Farnood Rahmati, Jacek Lipkowski, Ai-Cheng Chen

Journal of Electrochemistry

The conversion of carbon dioxide (CO₂) to carbon monoxide (CO) and other value-added products is an interesting approach for carbon-containing fuel synthesis using renewable and clean energy. The electrochemical reduction of CO₂ is one of the promising strategies for the storage of intermittent renewable energy resources. The development of electrocatalysts with high activity and stability is vital in the electrochemical CO₂ reduction process. In this study, copper and gold alloyed (CuAu) electrodes with nanodendritic structures were synthesized using a facile electrodeposition method. The CuAu nanodendrites with the atomic ratio of Cu to Au being approximately 1:1 …

Progress Of Lithium-Ion Transport Mechanism In Solid-State Electrolytes, Bing-Kai Zhang, Lu-Yi Yang, Shun-Ning Li, Feng Pan

Journal of Electrochemistry

Inorganic crystalline solid electrolytes exhibit exceptional room-temperature ionic conductivities, giving them the potential to enable all-solid-state lithium (Li) - ion batteries. Developing new high-performance electrolytes is one of the most critical challenges to realize solid-state batteries, which requires understanding how chemistry facilitates fast ionic conduction and what the Li-ion migration mechanism is in inorganic solid electrolytes. In this review, we aim to summarize recent fundamental research progress in Li-ion transport, including crystal structure, behavior of ion migration (i.e., single-ion jump and multi-ions cooperative migration), and the relationship between ion migration and microstructure.
Generally, ion transport in crystalline structure can be …

Studies And Progresses On Hole Metallization In High-Density Interconnected Printed Circuit Boards, Zhao-Yun Wang, Lei Jin, Jia-Qiang Yang, Wei-Qing Li, Dong-Ping Zhan, Fang-Zu Yang, Shi-Gang Sun

Journal of Electrochemistry

Printed circuit boards (PCBs) are almost the core components of all electronic systems. With the rapid development of sciences and technologies, PCBs are gradually developing in the direction of multi-layer, thin and high-density wiring due to the functionalization, miniaturization, lightweight and high reliability of electronic products, as well as the widespread popularization of the subminiature package such as chip scale package (CSP) and ball grid array (BGA). Therefore, High-density interconnected printed circuit boards (HDI-PCBs) arise. Hole metallization is one of the core technologies in HDI-PCBs and includes two processes composed of conductive treatment and electron electroplating. Electroless copper plating, as …

Design And Fabrication Of The Electrolytic Cell With Silicon-Based Boron-Doped Diamond Electrode And Its Feasibility ForIn-Situ Nuclear Magnetic Resonance Study, Hao Peng, Hui-Jun Sun, Zhi-You Zhou, Lin-Fan Shen, Long Huang, Shuo-Hui Cao, Shi-Gang Sun

Journal of Electrochemistry

In-situ EC-NMR technique can be used to monitor the electrochemical reaction process in real-time and to explain the reaction mechanism at the molecular level, which is a promising and non-destructive online detection technology. This article for the first time reports the design and production of in-situEC-NMR three-electrode single-chamber electrolytic cell using silicon-based boron-doped diamond (Si/BDD) as the working electrode. Research shows that the geometric size of Si/BDD electrode being 12.5 mm 1.2 mm 0.5 mm in the NMR detection zone is small and the thickness of the electrode material is thin, which accounts for the less hindrance …

Problem Solving Methods For Synthesis Of Physical Principles Of Mechatronic Module Operations In Intelligent Robotic Systems, Nazarov Khayriddin Nuritdinovich

Chemical Technology, Control and Management

The scientific paper investigates the methods for solving problems of synthesis of physical principles of operation of mechatronic modules of intelligent robotic systems are considered.

In addition, it deals with the specifics of the process of synthesis of the physical principles of the operation of mechatronic modules using predicate models, list models and information matrices of physical and technical effects.

It shows the interpretation of the components of the model of the system for the synthesis of the physical principles of operation of mechatronic modules of intelligent robotic systems and automatic control and the features of the synthesis algorithm for …

Recent Advances In Glycerol Electrooxidation On Pt And Pd: From Reaction Mechanisms To Catalytic Materials, Wei-Yi Zhang, Xian-Yin Ma, Shou-Zhong Zou, Wen-Bin Cai

Journal of Electrochemistry

The conversion of glycerol to value-added products has received considerable attention recently because the booming biodiesel industry produces a large amount of glycerol as a byproduct. Among various means, electrocatalytic oxidation of glycerol is appealing owing to its environmental friendliness and high efficiency. However, electrooxidation of glycerol is very complex, involving multiple electron and proton transfer processes with many reaction pathways. How to rationally design catalysts with high selectivity toward targeted products is an overarching challenge, and of both fundamental and practical significance. In this minireview we aim to provide an overview of recent advancements in electrooxidation of glycerol focusing …

Data-Driven Studies On Social Networks: Privacy And Simulation, Yasanka Sameera Horawalavithana

USF Tampa Graduate Theses and Dissertations

Social media datasets are fundamental to understanding a variety of phenomena, such as epidemics, adoption of behavior, crowd management, and political uprisings. At the same time, many such datasets capturing computer-mediated social interactions are recorded nowadays by individual researchers or by organizations. However, while the need for real social graphs and the supply of such datasets are well established, the flow of data from data owners to researchers is significantly hampered by privacy risks: even when humans’ identities are removed, or data is anonymized to some extent, studies have proven repeatedly that re-identifying anonymized user identities (i.e., de-anonymization) is doable …

Risks To Student Achievement In Higher Education, Angela Atwell, Bettina Mrusek, James Solti, Keith Wilson

Publications

A university system sets out to deliver educational experiences that meet set goals such as the achievement of learning outcomes for individual courses and program outcomes for degree programs. There are many factors that impact the successful achievement of student learning outcomes and there-fore successful program design and implementation. If courses are not effec-tively designed with assessments properly aligned to learning outcomes, student achievement is challenging to measure. If faculty do not consistently adhere to college and/or university policies regarding submission of assignments, student behavior and perceptions of expectations in future courses may be skewed. In addition, students may, for …

Web Services In Cloud Computing Research: Insights From Scientometric, Sivankalai S, Virumandi A

Library Philosophy and Practice (e-journal)

The research is the outcome of the investigation of 4035 papers on web services and cloud study, as covered in the Web of Knowledge core collection database during 2010 - 2019, going through an overall group author contribution of 29.00% during the period, Iosup, Alexandru, et al with a citation impact per paper of 44.10% and a journal impact per paper of 5.768 by Future generation computer systems-the international journal of science. The world's web services and cloud research output is diverse, with the top three open access research journals accounting for 66.59% (All Open Access 44.03%, DOAJ Gold 17.41%, …

Determination Of Main Ingredients In Milk Using Akm-98 Milk Analyzer, Qobil Mukhiddinov Master, Sh Sultanova Dr., J Safarov Dr. Professor, A Aït-Kaddour Dr., Professor, D Samandarov Phd

Technical science and innovation

The aim of the research is a quick, easy, economical way to determine milk content. Nowadays, the production of cow’s milk is dominant, but the original quality of non-bovine milk, such as camel’s milk, is now better described and is experiencing growing interest. Camel’s milk, goat’s milk, ewe’s milk and buffalo’s milk have received special attention because of their recognition as potential functional foods from a nutritional point of view. It is admitted that camel’s milk presents a high nutritional quality; e.g., it has three times more vitamin C, minerals, and essential and polyunsaturated Fatty Acids than cow’s milk. It …

Investigation Of The Polycondensation Reaction Of Waste Chemicals In Order To Use Them To Produce Ion-Exchange Polymers, Kh Makhmudov, M Berdieva, A Yuldashev, T Tursunov, R Nazirova, S Turabdjanov, B Kedelbaev

Technical science and innovation

In this article, we investigated the polycondensation reaction of cube wastes from the Shurtan gas-chemical complex with furfural as a function of reaction temperature, catalyst existence and concentration, starting substance ratio, and other factors. This research resulted in the creation of a new polymer that was used as a polymer matrix for the introduction of ionogenic groups. The composition of cubic waste (CW) from the Shurtan Gas Chemical Complex (SGCC) has been determined by chromatographic analysis. A mixture of CW-1 and CW-2 in equal weight ratios was used to produce the polymer (this mixture will hereinafter be referred to simply …

The Concept Of Force-Moment Sensing Of Multi-Position Mechatronic Modules Of Intelligent Robots, Nazarov Khayriddin Nuritdinovich, Temurbek Omonboyevich Rakhimov

Technical science and innovation

The concept of force-moment sensing of multiposition mechatronic modules (MMM) of intelligent robots and robotic systems is considered. In modern intelligent mechatronic modules, the use of force-torque sensing is focused on expanding their functionality in the automation of various technological operations. In the developed intelligent multi-position mechatronic module of motion, its control loop includes a force-torque system (FTS) designed to measure the components of the main vector of forces and moments acting on the gripper or tool of the mechatronic module and form a logical or continuous control action on the actuator in projections on the associated him a coordinate …

Assessing The Software Reliability Of The Process Control Systems, Kh S. Turaev, N A. Yusupbekov, V B. Tarasov

Technical science and innovation

Methods of increasing the reliability of components and assemblies of control systems for technological processes and production, as well as methods of using fault-tolerant architecture and redundancy are analyzed. A methodology for assessing the reliability of software (SW) of an automatic control system for technological processes and production is proposed. A mathematical model for assessing the reliability of software is obtained by extending methods for assessing the reliability of hardware to software, taking into account the specifics of the latter. In this case, reliability is understood as the faultlessness of the program, and the main focus is on testing and …

Evaluation Of Fluoride Adsorption Mechanism And Capacity Of Different Types Of Bone Char, Benyapa Sawangjang, Phacharapol Induvesa, Aunnop Wongrueng, Chayakorn Pumas, Suraphong Wattanachira, Pharkphum Rakruam, Patiparn Punyapalakul, Satoshi Takizawa, Eakalak Khan

Civil and Environmental Engineering and Construction Faculty Research

The fluoride adsorption capacity of three types of bone char (BC), including cow BC (CBC), chicken BC (CKBC), and pig BC (PBC), was examined. At the optimum charring conditions (temperature and time), PBC had the highest hydroxyapatite (HAP) content (0.928 g-HAP/g-BC), while CBC had the highest specific surface area (103.11 m2/g-BC). CBC also had the maximum fluoride adsorption capacity (0.788 mg-F/g-HAP), suggesting that fluoride adsorption capacity depends more on the specific surface area of the BC than the HAP content. The adsorption data of CBC, CKBC, and PBC fit well with the pseudo-second-order model and the Langmuir isotherm. The maximum …

A State-Of-The-Art Review Of Laser-Assisted Bioprinting And Its Future Research Trends, Chaoran Dou, Victoria Perez, Jie Qu, Andrew Tsin, Ben Xu, Jianzhi Li

Manufacturing & Industrial Engineering Faculty Publications

Bioprinting is an additive manufacturing technology with great potential in medical applications. Among available bioprinting techniques, laser-assisted bioprinting (LAB) is a promising technique due to its high resolution, high cell viability, and the capability to deposit high-viscousity bioink. These characteristics allow the LAB technology to control cells precisely to reconstruct living organs. Recent developments of LAB technologies are reviewed in this paper, covering various designs of LAB printers, research progresses in energy-absorbing layer (EAL), the physical phenomenon that triggers the printing process in terms of bubble formation and jet development, printing process parameters, and major factors related to the post-printing …

Fasten: An Iot Platform For Supply Chain Management In A Covid-19 Pandemic Scenario, Fernando Lemos, Thays Do Nascimento, Gustavo Dalmarco

Markets, Globalization & Development Review

This paper points out the major disruptions caused by the COVID-19 pandemic. It proposes an automated Internet-of-Things (IoT) based manufacturing and supply chain system, termed FASTEN, that can deal with such severe disruptions.

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

Research On Green Coal Mining Strategy In Hedong Coalfield Based On Resource And Geological Environment Characteristic, Liu Hanbin, Cheng Fangqin

Coal Geology & Exploration

Hedong Coalfield is located in the Loess Plateau of western Shanxi province at the western foot of the Lvliang Mountains in the middle reaches of the Yellow River. It is an important coking coal producing area, with severe soil erosion, fragile ecological environment, frequent occurrence of geological disasters and karst spring distribution in China. Through the analysis of resource and geological environment characteristics of Hedong Coalfield, it is found that the scarce coking coal reserves in Liliu mining area in the middle of the coalfield account for 70.8% of the total reserves. But its development intensity is higher than the …

Distribution And Enrichment Of Pollutants From Underground Gasification Of Bituminous Coal In Huating Mining Area, Zhu Lihui, Feng Beizhan, Hu Yongxing, Wang Mingzhong

Coal Geology & Exploration

In order to study the enrichment and distribution of pollutants from the underground gasification of bituminous coal in Huating Mining Area, and to evaluate the environmental factors of the underground gasification of bituminous coal, with an underground gasification simulation experimental platform system, this paper studies the enrichment of heavy metal pollutants in tar and gasification residues during gasification process by means of different oxygen-rich-water gasification experiments and pyrolysis experiments of coal samples in different sizes. The results show that the pyrolytic tar of bituminous coal tends to increase as its size increases, and the yield increases first and then decreases. …

Occurrence Characteristics And Resource Potential Evaluation Of Tar-Rich Coal For No.5-2Coal Seam In Shenfu Mining Area, Li Huabing, Yao Zheng, Li Ning, Gao Jun, Xie Qing, Wang Qiang

Coal Geology & Exploration

With the promotion of clean and efficient utilization of coal and the demand for high-quality development in the middle section of the Yellow River, the transformation and upgrading of coal industry is imperative in Yulin, and the exploitation of tar-rich coal one of the important directions. By organizing and making use of mass drill data, and in combination with the minefield underground spot sampling and regional geology, tar-yield characteristics and tar-rich coal occurrence features of tar-rich coal in No.5^-2 coal seam in Shenfu Mining Area are analyzed in detail. Based on analytic hierarchy process, this paper takes resource allocation, …

Organic Geochemistry Of The Jurassic Tar-Rich Coal In Northern Shaanxi Province, Zhang Ning, Xu Yun, Qiao Junwei, Ning Shuzheng

Coal Geology & Exploration

The organic geochemical characteristics of tar-rich coal are of great significance to study the paleosedimentary environment and evolution of coal seams. Taking coal samples from 6 main coal seams of Yan’an Formation in Northern Shaanxi Province as the research object, this paper analyses the organic geochemical characteristics of coal seams by coal quality analysis and gas chromatography-mass spectrometry. The results showed that coal samples had a high abundance of chloroform asphalt "A" and a low saturated hydrocarbon/aromatic hydrocarbon ratios, characterized by the unimodal pattern of n-alkanes and dominated by medium chainsaturated hydrocarbons. The ratios of Pr/C₁₇, Ph/C_{18 …}

Occurrence Characteristics Of Carboniferous-Permian Tar-Rich Coal And Its Influencing Factors In Northern Shaanxi, Yao Zheng, Luo Qianzhou, Li Ning, Li Huabing, Wang Qiang, Gao Jun

Coal Geology & Exploration

The rational development of tar-rich coal is of great significance to promote clean and efficient utilization of coal, improve the independent guarantee ability of oil and gas, and achieve carbon emission peak and carbon neutrality. In order to find out the occurrence characteristics of tar-rich coal in the typical mining areas of Carboniferous-Permian coalfield in Northern Shaanxi, based on coal exploration data and sample test results, this paper compares the tar yield of mineable coal seams, summarizes the spatial-temporal distribution rules of tar-rich coal, and discusses the occurrence influential factors. The results show that the average tar yield of mineable …

Gas Drainage Borehole Completion Technology Of Directional Long Hole Drilling With Negative Angle, Ma Zan, Chen Dongdong, Xie Hengxing, Chen Tianzhu, Wang Bin, Jia Bingyi

Coal Geology & Exploration

Pre-drainage of coal seam gas with directional long boreholes is an effective technical means to achieve advanced control of coal mine gas area. Affected by mining deployment, negative-angle boreholes(downward holes) are widely used in production. Medium-hard coal seams have good porosity and usually do not require hole protection. However, the existing conventional methods can not effectively solve the problem of water accumulation in negative angle long boreholes. This paper takes the downward long boreholes in the No. 9 medium-hard coal seam of Longfeng Coal Mine in Guizhou as the research object. Two sets of directional long boreholes are constructed in …

The Concealed Small Faults Detection Based On Gas Drainage Boreholes Along And Cross The Coal Seam, Xue Honglai, Wen Zhe

Coal Geology & Exploration

The faults have great influence on coal and gas outburst disasters, and accurate detection of faults location is very important to prevent such disasters. At present, large number of gas drainage boreholes were drilled in coal mines, but the geological information contained in these boreholes is not fully paid attention to, thus the method to detect concealed faults by gas-drainage boreholes was proposed. In this paper, by establishing a mathematical model for fault detection based on gas drainage drilling, a three-dimensional coordinate of fault planes and coal seam floors is calculated, and basic parameters such as fault location, drop, attitude …

Quantitative Study Of 3d Numerical Simulation On Optimizing Borehole Layout Spacing Of Gas Drainage, Chen Yuexia, Chu Tingxiang, Chen Peng, Tang Yang

Coal Geology & Exploration

In order to optimize the spacing of boreholes and realize efficient drainage, based on the fluid solid coupling model, a three-dimensional geometric model was established to make it closer to the field reality, the gas drainage processes of a coal mine with different borehole spacing were simulated using COMSOL software. The results show that: the effective drainage area was visualized by the three-dimensional diagram of the isobaric surface with gas pressure of 0.74 MPa, and the influence of borehole spacing on the extraction efficiency was discussed. The results show that: the effective extraction radius is about 1.5 m during gas …

An Advanced Co2 Gas-Phase Fracturing Technology For Efficient Methane Drainage, Outburst Prevention And Excavation In Outburst Coal Seam, Yang Baige, Zhang Junsheng, Linghu Jianshe, Cao Yunxing

Coal Geology & Exploration

Coal and gas outburst in coal mines is a serious disaster in China. Although the disaster has been reduced significantly over the past 10 years, vicious accidents still occure, causing serious losses to the lives of miners and the safety of coal mines. The current applied technologies for outburst prevention and control include hydraulic fracturing, hydraulic slitting, hydraulic flushing, deep hole blasting, intensive drilling, etc., which have solved the outburst problem and safe excavation in some degrees. Nevertheless, the above-mentioned technologies could not solve the problems of safety excavation in the high gas content and low permeability outburst coal seams. …

Effect Of Load On Adsorption Characteristics Of Remolded Coal, Dai Juhua, Wang Zhaofeng, Li Xuechen, Li Yanfei, Yue Jiwei

Coal Geology & Exploration

In view of the difficulty in preparing the coal with broken soft structure intact, it needs to be processed into remolded coal. In order to study the influence of suppression loads on the physical characteristics of coal, the micro-pore structure and adsorption characteristics of remolded coal under different molding loads were discussed based on the pore test experiment of low temperature liquid nitrogen and the methane adsorption experiment of high pressure capacity method. The results show that: The pore volume of micropores and pores decreases slightly with the increase of molding load, the specific surface area increases slightly with the …

Hydrate Reservoir Physical Properties Response And High-Pressure Gas-Water Reverse Penetration During Deepwater Oil And Gas Cementing, Zheng Mingming, Wang Xiaoyu, Zhou Kerui, Wang Kai, Wang Zhilin, Dong Gang, Wei Meng, Liu Tianle, Jia Dongyan

Coal Geology & Exploration

Well cementing is an important stage during the process of energy extraction. When deep-water oil and gas cementing encounters hydrate formations, the hydration heat of cementing slurry will cause hydrate decomposition in the reservoir near the borehole wall and reverse penetration of high-pressure gas-water. To reduce and avoid the adverse effects of hydrate decomposition, it is critical to clarify the physical response of hydrate reservoirs and the law of high-pressure gas-water reverse penetration under different cementing conditions. In this paper, a two-dimensional cementing numerical model is established according to the SH2 exploration well of GMGS-1 project in Shenhu area in …

The Development Of A Single-Component Non-Cable Seismograph In Underground Coal Mines, Li Yuan

Coal Geology & Exploration

In-seam wave seismic exploration, featured in wide detection range and high accuracy, plays an increasingly important role in the refined exploration of coal geological structures. However, most seismic exploration equipment is bulky, with a large number of cables are laid in construction, leading to low efficiency and high construction cost. This seriously restricts the development of high-precision in-seam wave seismic exploration technology in underground coal mines. Based on the design concept of nodal seismograph, the moving coil geophone is integrated into a complete cavity with the acquisition and control circuit, the time precision keeping circuit and the power supply circuit. …

Green Detection Method Of Coal Burning Area In Northern Shaanxi Based On Microbial Hydrocarbon Detection Technology, Duan Zhonghui, Ma Li, Hao Chun, Wang Lengyao, Mei Hai

Coal Geology & Exploration

Coal seams contain all kinds of light hydrocarbons. When coal seams are burned, the integrity of overlying strata is destroyed, which provides a good channel for hydrocarbon escape from the coal seam. This process conforms to the principle of light hydrocarbon microseepage. Then, microseepage associated microbial hydrocarbon detection technology is introduced to test its recognition ability of coal seam burning area. In Haojialiang Coal Mine of Jurassic Coalfield in northern Shaanxi, two survey lines were tested and butane bacteria was selected as microbial detection index. After microbial analysis process such as soil sampling, microbial culture, and colony count, combined with …