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2021

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Articles 2701 - 2730 of 9983

Full-Text Articles in Engineering

Artificial Neural Networks For Measuring The Moisture Of Bulk Materials, Erkin Uljaev, Shohrux Nurali O‘G‘Li Narzullayev Aug 2021

Artificial Neural Networks For Measuring The Moisture Of Bulk Materials, Erkin Uljaev, Shohrux Nurali O‘G‘Li Narzullayev

Chemical Technology, Control and Management

One of the urgent tasks of industrial production is improving the quality of verification of received, manufactured, and stored products, reducing energy consumption in the production of a final product. The solution to this problem is impossible without the creation of devices that control the quality indicators of materials within the limits of the permissible error. One of the most common indicators of the quality of bulk materials is moisture. In the national economy and industrial production, it is required to determine the moisture content of more than 500 different substances and materials. The paper shows the possibility of using …

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Analysis Of Errors Of The Ultrasonic Level And Increasing The Accuracy Of Measuring The Level Of Liquid Materials In Non-Stationary Media, Azamat Alijonovich Yusupov Aug 2021

Analysis Of Errors Of The Ultrasonic Level And Increasing The Accuracy Of Measuring The Level Of Liquid Materials In Non-Stationary Media, Azamat Alijonovich Yusupov

Chemical Technology, Control and Management

This article is devoted to the analysis of the total error of an ultrasonic level meter designed to measure the level of liquid materials in order to improve the accuracy of the measuring system in tanks. The components of the total error of the process of measuring transformation of the liquid level are determined and the analysis of the main characteristics is carried out, to reduce the random error of the measurement system, the task of ensuring the accuracy of measurement and control of the level using an ultrasonic level gauge is presented, by averaging the measurement results when calculating …

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Formalization Of The Procedure For Choosing The Optimality Criterion And Formulation The Problem Of Ammonium Nitrate Production Control, Husan Zakirovich Igamberdiev, Uktam Farkhodovich Mamirov Aug 2021

Formalization Of The Procedure For Choosing The Optimality Criterion And Formulation The Problem Of Ammonium Nitrate Production Control, Husan Zakirovich Igamberdiev, Uktam Farkhodovich Mamirov

Chemical Technology, Control and Management

The article discusses the questions of formalization of the procedure for choosing an optimality criterion and setting the problem of controlling the production of ammonium nitrate. The analysis of the technical and economic features of the considered production is carried out. As a criterion for the efficient operation of ammonium nitrate production, such a technological indicator as specific technological costs for the main stages, determined by the interval of quasi-stationarity of the object, is used, i.e. the time of its stable work. To solve the control problem, it is proposed to use the decomposition of the control problem into a …

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Dft Study Of NiM@Pt1AuN-M-1 (N=19, 38, 55, 79; M = 1, 6, 13, 19) Core-Shell Orr Catalyst, Wen-Jie Li, Dong-Xu Tian, Hong Du, Xi-Qiang Yan Aug 2021

Dft Study Of NiM@Pt1AuN-M-1 (N=19, 38, 55, 79; M = 1, 6, 13, 19) Core-Shell Orr Catalyst, Wen-Jie Li, Dong-Xu Tian, Hong Du, Xi-Qiang Yan

Journal of Electrochemistry

The slow kinetics of oxygen reduction reaction (ORR) limits the performance of low temperature fuel cells. Thus, it needs to design effective catalysts with low cost. Core-shell clusters (CSNCs) show promising activity because of their size-dependent geometric and electronic effects. The ORR activity trend of Nim@Pt1Aun-m-1(n = 19, 38, 55, 79; m = 1, 6, 13, 19) was studied using the GGA-PBE-PAW methods. The adsorption configurations of *O, *OH and *OOH were optimized and the reaction free energies of four proton electron (H+ + e-) transfer steps …

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One-Pot Synthesis Of Fe2O3@Fe-N-C Oxygen Reduction Electrocatalyst And Its Performance For Zinc-Air Battery, Hua Lin, Yi-Jin Wu, Jun-Tao Li, Yao Zhou Aug 2021

One-Pot Synthesis Of Fe2O3@Fe-N-C Oxygen Reduction Electrocatalyst And Its Performance For Zinc-Air Battery, Hua Lin, Yi-Jin Wu, Jun-Tao Li, Yao Zhou

Journal of Electrochemistry

Oxygen reduction reaction (ORR) plays a profound role in determining cathode performance in metal-air batteries and fuel cells. Owing to its inherently sluggish kinetics, high-performance ORR catalysts which favors the scissoring of O-O bond and formation of O-H bond are a requisite. In this regard, Pt has been explored as the most efficient ORR electrocatalysts. Nevertheless, due to its expensiveness, the usage of Pt catalysts represents one of the major sources of cost in those energy conversion devices. Thus, the development of alternative ORR electrocatalysts with minimized Pt utilization has been widely pursued over the past few decades. Metal-nitrogen-carbon catalysts …

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Study On Mxene-Carbon Black/Sulfur Composite In Integrated Electrode Of Lithium-Sulfur Batteries, Ye-Peng Fan, Ye-Qiang Luo, Pei-Kang Shen Aug 2021

Study On Mxene-Carbon Black/Sulfur Composite In Integrated Electrode Of Lithium-Sulfur Batteries, Ye-Peng Fan, Ye-Qiang Luo, Pei-Kang Shen

Journal of Electrochemistry

Lithium-sulfur (Li-S) batteries are considered as a promising energy storage device due to their ultrahigh theoretical energy density of 2500 Wh·kg-1 and low cost. However, the practical application of Li-S batteries is seriously limited by their low actual energy density, the shuttle effect of polysulfides (LiPSs), and the insulating nature of sulfur and lithium sulfides. Carbon materials have been developed in the design of sulfur hosts due to their adjustable pore structure and high electrical conductivity, but their non-polar surfaces have weak interactions with LiPSs. Herein, MXene-carbon black/sulfur (Ti3C2Tx-CB/S) composites were prepared and …

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Preparation And Electrochemical Evaluation Of Mos2/Graphene Quantum Dots As A Catalyst For Hydrogen Evolution In Microbial Electrolysis Cell, Hong-Yan Dai, Hui-Min Yang, Xian Liu, Xiu-Li Song, Zhen-Hai Liang Aug 2021

Preparation And Electrochemical Evaluation Of Mos2/Graphene Quantum Dots As A Catalyst For Hydrogen Evolution In Microbial Electrolysis Cell, Hong-Yan Dai, Hui-Min Yang, Xian Liu, Xiu-Li Song, Zhen-Hai Liang

Journal of Electrochemistry

Microbial electrolysis cell (MEC) is a relatively new bioelectrochemical technology that produces H2 and meanwhile treats organic wastewater. Cathode hydrogen evolution catalyst plays a key role in MEC. The doping of Graphene Quantum Dots (GQDs) into MoS2 nanosheets can improve the catalytic activity of MoS2 by creating abundant defect sites both in the edge plane and the basal plane, as well as enhancing the electrical conductivity. In this paper, using Na2MoO4 , cysteine and GQDs as raw materials, a series of MoS2/GQDs composites were firstly synthesized via hydrothermal method, and then loaded …

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A Preliminary Study On Graphene Film-Metal Composites Prepared By Electrodeposition, Shuang-Juan Liu, Hai-Jing Wang, Jing Guo, Peng-Cheng Wang, Hao Zhou, Cai Meng, Han-Jie Guo Aug 2021

A Preliminary Study On Graphene Film-Metal Composites Prepared By Electrodeposition, Shuang-Juan Liu, Hai-Jing Wang, Jing Guo, Peng-Cheng Wang, Hao Zhou, Cai Meng, Han-Jie Guo

Journal of Electrochemistry

Graphene film (GF) has excellent electrical and thermal conductivity, but low strength and hardness. In order to obtain good comprehensive mechanical properties to improve the practical value of GF, the concept of preparing GF-metal composite materials was proposed. This work was conducted to preliminarily study the feasibility of using electrodeposition method to prepare GF-metal composites. Two kinds of composites, GF-Cu and GF-Cr, were successfully prepared by using GF as the cathode, and pure Cu and DSA (Dimensionally Stable Anode) as the anodes, respectively, with applying DC power externally. Employing certain electrochemical parameters, the cation in the electrolyte moved towards the …

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Sharcs: Secure Hierarchical Adaptive Reliable Cloud Storage Systems, Chaoyu Zhang Aug 2021

Sharcs: Secure Hierarchical Adaptive Reliable Cloud Storage Systems, Chaoyu Zhang

Student Theses and Dissertations

The recent development of cloud technology provides an on-demand availability of storage and computing resource without purchasing expensive hardware. However, traditional cloud storage services encountered challenges in data security, network communications, and system performance to emerging applications. Furthermore, these challenges have a significant influence when the massive IoT devices access cloud and the outsourcing data loss of physical control. Therefore, we design the SHARCS (Secure Hierarchical Adaptive Reliable Cloud Storage) systems to implement the multi-layer cloud storage that outsources parallelized ABE (Attribute-Based Encryption) to fog servers and equip IoT devices with TrustZone. This study aims to provide a general-purpose solution …

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Preparation Of 3d Semi-Interpenetrated Polymer Networks Polymer Electrolyte For Lithium Metal Battery, Yun-Feng Zhang, Jia-Ying Wang, Xiao-Jie Li, Shi-Yu Zhao, Yang He, Shi-Kang Huo, Ya-Ying Wang, Chang Tan Aug 2021

Preparation Of 3d Semi-Interpenetrated Polymer Networks Polymer Electrolyte For Lithium Metal Battery, Yun-Feng Zhang, Jia-Ying Wang, Xiao-Jie Li, Shi-Yu Zhao, Yang He, Shi-Kang Huo, Ya-Ying Wang, Chang Tan

Journal of Electrochemistry

As the next generation high-energy batteries, lithium metal battery has attracted more and more attention due to its highest specific capacity (3860 mA·h·g-1) and the lowest anode potential (-3.04 V versus the standard hydrogen electrode, SHE). However, the safety problem caused by lithium dendrite growth is one of the biggest challenges for the commercialization of lithium metal batteries. Single ion conducting polymer electrolytes, which deliver high lithium ion transference number, represent one of the important strategies to inhibit lithium dendrite growth. However, the poor compatibility with electrodes and low ionic conductivity largely limit their practical application. In the …

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Study On Inhibition Of Lithium Dendrite Growth By Mg(No3)2 Additive In Carbonate Electrolyte, Biao Zhang, Yi Shuai, Yu Wang, Na-Chuan Yang, Kang-Hua Chen Aug 2021

Study On Inhibition Of Lithium Dendrite Growth By Mg(No3)2 Additive In Carbonate Electrolyte, Biao Zhang, Yi Shuai, Yu Wang, Na-Chuan Yang, Kang-Hua Chen

Journal of Electrochemistry

In the lithium-sulfurized polyacrylonitrile battery system, the formation and growth of lithium dendrites in the negative electrode seriously deteriorate the charge and discharge performance of the battery. If the growth of lithium dendrites pierces the separator and causes thermal runaway, it will also bring serious damage to the battery, causing potential safety risks. In the carbonate electrolyte that is more conducive to stabilizing the positive electrode sulfurized polyacrylonitrile material, the growth of lithium dendrites is particularly serious. In this paper, magnesium nitrate was added to the carbonate electrolyte to investigate the combined effect of nitrate and magnesium ions on the …

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A Comparison In Structural Transformation Of Li[NiXCoYMnZ]O2 (X = 0.6, 0.85) Cathode Materials In Lithium-Ion Batteries, Li-Juan Li, Zhen-Dong Zhu, Juan Dai, Rong-Rong Wang, Wen Peng Aug 2021

A Comparison In Structural Transformation Of Li[NiXCoYMnZ]O2 (X = 0.6, 0.85) Cathode Materials In Lithium-Ion Batteries, Li-Juan Li, Zhen-Dong Zhu, Juan Dai, Rong-Rong Wang, Wen Peng

Journal of Electrochemistry

In this paper, the phase transformation voltage ranges of two layered oxide ternary cathode materials, namely, Li(Ni0.85Co0.10Mn0.05)O2 (referred to Ni85, presenting high Ni content) and Li(Ni0.6Co0.2Mn0.2)O2 (referred to Ni60, presenting common low Ni content), were classified and determined. The structural differences between high Ni and common low Ni ternary materials were studied in order to understand the structure instability of high nickel material during the charging process. At the same time, the differential capacity (dQ·dV-1) curves of Ni85 and Ni60 positive …

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Effect Of Conductive Additives On Electrochemical Performance Of All-Solid-State Li-S Batteries, Dong-Hao Wang, He-Feng Yan, Zheng-Liang Gong Aug 2021

Effect Of Conductive Additives On Electrochemical Performance Of All-Solid-State Li-S Batteries, Dong-Hao Wang, He-Feng Yan, Zheng-Liang Gong

Journal of Electrochemistry

All-solid-state lithium sulfur batteries (ASSLSBs) with inorganic solid electrolytes offer an opportunity to realize both high energy density (lithium metal ~ 3860 mAh·g-1, sulfur ~ 1675 mAh·g-1), safety and reliability, via eliminating the polysulfides shuttle effect and flammable liquid electrolyte. However, it still remains a huge challenge for ASSLSBs to achieve high areal active mass loading, high utilization efficiency of the active materials and good cycle stability simultaneously due to the insulating nature of sulfur and Li2S (conductivities of sulfur and Li2S are 5×10-30 S·cm-1 and 3.6×10-7 S·cm-1 …

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Storage Performance And Mechanism Of Mose2 Nanospheres In Lithium And Magnesium Ion Batteries, Yi Peng, Wei Zhang, Fang-Zhen Zuo, Hao-Ying Lv, Kai-Jun Hong Aug 2021

Storage Performance And Mechanism Of Mose2 Nanospheres In Lithium And Magnesium Ion Batteries, Yi Peng, Wei Zhang, Fang-Zhen Zuo, Hao-Ying Lv, Kai-Jun Hong

Journal of Electrochemistry

Molybdenum diselenide (MoSe2) is a two-dimensional (2D) transition metal dichalcogenide (TMD) material, attracting wide attention in lithium ion battery (LIB) and exhibiting great potential in next-generation magnesium ion battery (MIB) due to its unique layered structure with fast ion mobility and weak van der Waals interlayer interaction. However, the reported literatures related to MoSe2 mainly focus on the enhancement of performance in LIB without deep storage mechanisms investigations. Meanwhile,the magnesium storage capacity and mechanisms have not been explored. In this work, MoSe2 nanospheres were synthesized via wet chemical route and followed by annealing treatment. When used …

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A Review Of Characteristics Of Bio-Oils And Their Utilization As Additives Of Asphalts, Ran Zhang, Zhanping You, Jie Ji, Qingwen Shi, Zhi Suo Aug 2021

A Review Of Characteristics Of Bio-Oils And Their Utilization As Additives Of Asphalts, Ran Zhang, Zhanping You, Jie Ji, Qingwen Shi, Zhi Suo

Michigan Tech Publications, Part 1

Transforming waste biomass materials into bio-oils in order to partially substitute petroleum asphalt can reduce environmental pollution and fossil energy consumption and has economic benefits. The characteristics of bio-oils and their utilization as additives of asphalts are the focus of this review. First, physicochemical properties of various bio-oils are characterized. Then, conventional, rheological, and chemical properties of bio-oil modified asphalt binders are synthetically reviewed, as well as road performance of bio-oil modified asphalt mixtures. Finally, performance optimization is discussed for bio-asphalt binders and mixtures. This review indicates that bio-oils are highly complex materials that contain various compounds. Moreover, bio-oils are …

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Preparation And Characterization Of Thermoplastic Polyurethane-Based Polymer Electrolyte, Li Zhou, Lie Wu, Zhao-Ming Xue Aug 2021

Preparation And Characterization Of Thermoplastic Polyurethane-Based Polymer Electrolyte, Li Zhou, Lie Wu, Zhao-Ming Xue

Journal of Electrochemistry

Electrolyte still has to be improved to satisfy the increasingly rigid demands of lithium ion batteries that have higher energy densities. Thermoplastic polyurethane (TPU) has two phase structures of soft segments and hard segments, which can guarantee the electrochemical and physical performances of electrolyte for lithium ion battery. It is now creatively applied to the gel polymer electrolyte matrix of lithium ion batteries. In this paper, a novel polymer membrane based on thermoplastic polyurethane/cellulose acetate (TPU/CA) was prepared by non-solvent induced phase separation (NIPS) method. Further, the TPU/CA blending gel polymer electrolyte (GPE) was prepared by absorbing liquid electrolyte. The …

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Preparation Of Coo/Rgo@Ni Foam Electrode And Its Electrocatalytic Reduction Of Co2, Qian Guo, Jia-Long Fu, Cheng-Yan Zhang, Chao-Yue Cai, Cheng Wang, Li-Hua Zhou, Rui-Bo Xu, Ming-Yan Wang Aug 2021

Preparation Of Coo/Rgo@Ni Foam Electrode And Its Electrocatalytic Reduction Of Co2, Qian Guo, Jia-Long Fu, Cheng-Yan Zhang, Chao-Yue Cai, Cheng Wang, Li-Hua Zhou, Rui-Bo Xu, Ming-Yan Wang

Journal of Electrochemistry

The worldwide extensive release of carbon dioxide (CO2) has caused serious environmental pollution and unprecedented climate change problems. Thus, for the sustainable development of human society, it is very necessary to convert CO2 to renewable fuels through clean and economical processes. The electrochemical CO2 reduction reaction (CO2RR) is regarded as a promising approach for the recycling of carbon resource and the generation of sustainable fuels. However, the slow kinetics and formation of multiple products in CO2RR hinder its large-scale application. Hence, great research efforts are made to develop electrocatalysts with high product …

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“Surviving And Growing Up With Illegal Status”: The Analysis Of Socio–Economic Household, Potential Conflict, The Environmental Damage, And Vulnerability Of Local Community To Disaster, Sofyan Syahnur, Yossi Diantimala Aug 2021

“Surviving And Growing Up With Illegal Status”: The Analysis Of Socio–Economic Household, Potential Conflict, The Environmental Damage, And Vulnerability Of Local Community To Disaster, Sofyan Syahnur, Yossi Diantimala

Journal of Sustainable Mining

This study aims to analyze, from social-economics and environmental perspectives, how illegal gold mining survives and grows with its illegal status. Generally, illegal mining has a positive impact on the socio-economy of all parties involved. However, mining activities cause environmental damage and pollution so that the local community is vulnerable to disaster and potential conflict. This research was conducted at an illegal mining site in Aceh, the western province of Indonesia. To describe the primary data, it employs a descriptive qualitative method. The purposive sampling method is used to select key informants. The results show an increasing income of all …

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Maritime Safety Supervision And Navigation Service Of Offshore Wind Farms In China, Zhimin Zhang Aug 2021

Maritime Safety Supervision And Navigation Service Of Offshore Wind Farms In China, Zhimin Zhang

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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Research On Navigation Efficiency Of Lng Carriers In Caofeidian Port Area, Zhongming Xiao Aug 2021

Research On Navigation Efficiency Of Lng Carriers In Caofeidian Port Area, Zhongming Xiao

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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Improved Ships Course-Keeping Robust Control Algorithm Based On Backstepping And Nonlinear Feedback, Sirui Wang Aug 2021

Improved Ships Course-Keeping Robust Control Algorithm Based On Backstepping And Nonlinear Feedback, Sirui Wang

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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Data-Driven Based Automatic Routing Planning For Mass, Qingwu Wang Aug 2021

Data-Driven Based Automatic Routing Planning For Mass, Qingwu Wang

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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In The Context Of Unmanned Vessels : Obstacles To The Application Of Colregs And Suggestions For Its Amendments, Baochuan Sun Aug 2021

In The Context Of Unmanned Vessels : Obstacles To The Application Of Colregs And Suggestions For Its Amendments, Baochuan Sun

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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Research On The Methods Of Ship's Autonomous Collision Avoidance In Complex Environment, Hongguang Lyu Aug 2021

Research On The Methods Of Ship's Autonomous Collision Avoidance In Complex Environment, Hongguang Lyu

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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Research On Collision Avoidance And Safety Measures Of Drilling Platform Towing Group, Junpo Liu Aug 2021

Research On Collision Avoidance And Safety Measures Of Drilling Platform Towing Group, Junpo Liu

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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Using Fsa Framework, Research On Maritime Safety Management Of The Highway Bridge Water Area On The Yalu River, Jing Han Aug 2021

Using Fsa Framework, Research On Maritime Safety Management Of The Highway Bridge Water Area On The Yalu River, Jing Han

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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Study On Risk Assessment Of Methanol Fueled Ship, Zhichao Chen Aug 2021

Study On Risk Assessment Of Methanol Fueled Ship, Zhichao Chen

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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No Ordinary Proteins: Adsorption And Molecular Orientation Of Monoclonal Antibodies, Ankit D. Kanthe, Andrew Ilott, Mary Krause, Songyan Zheng, Jinjiang Li, Wei Bu, Mrinal K. Bera, Binhua Lin, Charles Maldarelli, Raymond S. Tu Aug 2021

No Ordinary Proteins: Adsorption And Molecular Orientation Of Monoclonal Antibodies, Ankit D. Kanthe, Andrew Ilott, Mary Krause, Songyan Zheng, Jinjiang Li, Wei Bu, Mrinal K. Bera, Binhua Lin, Charles Maldarelli, Raymond S. Tu

Publications and Research

The interaction of monoclonal antibodies (mAbs) with air/water interfaces plays a crucial role in their overall stability in solution. We aim to understand this behavior using pendant bubble measurements to track the dynamic tension reduction and x-ray reflectivity to obtain the electron density profiles (EDPs) at the surface. Native immunoglobulin G mAb is a rigid molecule with a flat, “Y” shape, and simulated EDPs are obtained by rotating a homology construct at the surface. Comparing simulations with experimental EDPs, we obtain surface orientation probability maps showing mAbs transition from flat-on Y-shape configurations to side-on or end-on configurations with increasing concentration. …

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Flow Behavior Of Granular Soil And Impounded Fly Ash Slurries, Nuzhath Fatema Aug 2021

Flow Behavior Of Granular Soil And Impounded Fly Ash Slurries, Nuzhath Fatema

Dissertations - ALL

Failure of an embankment dam around mine tailings and coal ash slurry impoundments typically results in a fast-moving flow of toxic waste that can carry for several miles with disastrous consequence. The most recent catastrophic tailing-dam failure took place on 25 January 2019, at Brumadinho, Brazil, where the resultant tailings flow killed at least 232 people. A similar impoundment failure also occurred in 2008 at the TVA Kingston fossil power plant in Tennessee, USA, where coal combustion residuals such as fly ash and bottom ash were stored in the impoundments. The catastrophic failure at Kingston released 4.2 million m3 of …

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A Computational Model For Calcium Signaling In Osteocyte Cell Cultures Under Mechanical Stimulation, Courtney Rose Ogando Aug 2021

A Computational Model For Calcium Signaling In Osteocyte Cell Cultures Under Mechanical Stimulation, Courtney Rose Ogando

Theses - ALL

Bone is a highly complex and organized tissue that is composed of an abundance of cells including the osteocyte. While it is known that osteocytes are responsible for the control of the bone remodeling process and the maintenance of calcium (Ca2+) homeostasis using their network of gap junction connections, their complete role is not yet fully understood. It is also known that various bone related diseases as well as cancer demonstrate an alteration of Ca2+ homeostasis during the progression of the disease. Previous researchers have combined computational modeling with experimental studies to gain a better understanding of cell-to-cell Ca2+ signaling …

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