Engineering Commons^™

Effects Of So2 In Air On Performance Of Direct Methanol Fuel Cell, Bin Qin, Fen-Ning Jing, Xue-Jing Sun, Gong-Quan Sun, Hai Sun

Journal of Electrochemistry

Direct methanol fuel cells (DMFC) generally use oxygen as an oxidant. Contaminants such as sulfides and nitrides in the air can affect the performance of the DMFC. In this work, the effects of SO₂ on the performance of DMFC were investigated and the mechanism of poisoning was analyzed, by means of constant current discharge curve, polarization performance curve, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In the CV scan, the permeated methanol was oxidized at a low potential to eliminate its effect on the SO₂ poisoning behavior test. The results showed that the SO₂ poisoning resulted …

Fe-N Doped Hollow Carbon Nanospheres Linked By Carbon Nanotubes For Oxygen Reduction Reaction, Ya-Lin Zhang, Chi Chen, Liang-Liang Zou, Zhi-Qing Zou, Hui Yang

Journal of Electrochemistry

The development of non-precious metal catalysts for oxygen reduction reaction (ORR) is essential for large-scale application of proton exchange membrane fuel cells. Herein, we present the in situ formed Fe-N doped hollow carbon nanospheres linked by carbon nanotubes composite, synthesized by using ZIF-8 as sacrificed template to form polydopamine (PDA) hollow nanospheres, followed by complexing with FeCl₃, high temperature heat-treatment and NH₃-etching. ZIF-8 was gradually decomposed simultaneously with PDA coating due to the loss of Zn²⁺ grabbed by PDA. NH3 etching resulted in the improved surface area, while the reducibility of NH₃ resulted in …

Facile Synthesis Of Pt-Cu Alloy Nanodendrites As High-Performance Electrocatalysts For Oxygen Reduction Reaction, Liu-Xuan Luo, Guang-Hua Wei, Shui-Yun Shen, Feng-Juan Zhu, Chang-Chun Ke, Xiao-Hui Yan, Jun-Liang Zhang

Journal of Electrochemistry

Structures and compositions have significant effects on the catalytic properties of nanomaterials. Herein, a facile etching-based method was employed to synthesize Pt-Cu nanodendrites (NDs) with uniform and homogeneous alloy structures for enhancing oxygen reduction reaction (ORR). The formation of dendritic morphology was ascribed to the etching effect caused by the oxidative etchants of the Br^-/O₂ pair. The atomic ratio of Pt/Cu in Pt-Cu NDs could be easily tuned by altering the ratio of the Pt/Cu precursors, without deteriorating the dendritic morphology. The most active carbon-supported Pt₁Cu₁ NDs (Pt₁Cu₁ NDs/C) exhibited the …

Acid Treated Carbon As Anodic Electrocatalysts Toward Direct Ascorbic Acid Alkaline Membrane Fuel Cells, He-Mu Chen, Chen-Xi Qiu, Yuan-Yuan Cong, Hui-Yuan Liu, Zi-Hui Zhai, Yu-Jiang Song

Journal of Electrochemistry

In order to improve the hydrophilicity and electrocatalytic activity, commercial carbon black (BP 2000) was subjected to acid treatment to obtain acid-treated carbon (ATC). The generation of rich oxygen-containing groups on the surface of the ATC was proved by X-ray photoelectron spectra (XPS), Fourier transform-infra red spectra (FTIR), thermogravimetric analysis (TG) and contact angle measurement. UV-vis spectra were firstly recorded to calculate activation energy (Ea) of ascorbic acid (AA) chemical oxidation in alkaline conditions by oxygen in air and the Ea value was determined to be 37.1 kJ·mol^-1. Additionally, electrochemical impedance spectra (EIS) were used to evaluate unprecedented …

Pd/C Catalysts For Co2 Electroreduction To Co:Pd Loading Effect, Dun-Feng Gao, Cheng-Cheng Yan, Guo-Xiong Wang, Xin-He Bao

Journal of Electrochemistry

Nanostructured heterogeneous catalysts have been widely used in the electrochemical carbon dioxide (CO₂) reduction reaction (CO₂RR), which can simultaneously achieve the electrocatalytic conversion of CO₂ to fuels and the storage of renewable energy sources. Carbon supported palladium nanoparticles (Pd/C) catalysts have been previously reported to show excellent CO₂RR performance. However, the crucial role of the metal loading in supported electrocatalysts has been rarely reported. In this work, we study the Pd loading effect on the structure of Pd/C catalysts as well as their activity and selectivity of CO₂RR to CO. The …

The Internet Of Energy: Architectures, Cyber Security, And Applications, Kun Wang, Yan Zhang, Song Guo, Mianxiong Dong, Rose Qingyang Hu, Lei He

Electrical and Computer Engineering Faculty Publications

The energy crisis and carbon emissions have become two critical concerns globally. As a very promising solution, the concept of Internet of Energy has appeared to tackle these challenges. The Internet of Energy is a new power generation paradigm developing a revolutionary vision of smart grids into the Internet. The communication infrastructure is an essential component for implementing the Internet of Energy. A scalable and robust communication infrastructure is crucial in both operating and maintaining smart energy systems. The wide-scale implementation and development of Internet of Energy into industrial applications should take into account the following challenges:

The Method Of Transforming The Liquidated Oil And Gas Production Wells Into Technological Wells For Leaching Salts From Saline Deposits Such As Brine ., O.M Nabiev, T.Z Xaydarov, Sh.T Nabiev

Chemical Technology, Control and Management

The article reveals the essence of the invention, i.e. transformation of abandoned wells into technological wells by leaching sylvinite. The production of potassium fertilizers using the gallium method, reduces the technological cycle, capital investments, operating costs, energy and heat costs, and increases the return on assets of wells.

Liquid Suspended Fertilizers On Base Wet-Processing Phosphoric Acid Of Kyzylkum ., Sh.Yu Nomozov, U.K Alimov, Sh.S Namazov, A.R Seytnazarov

Chemical Technology, Control and Management

There have been determined the composition of liquid complex fertilizers based on low concentrated wet-processing phosphoric acid from washed and calcinated phosphoconcentrated of Kyzylkum. The density and viscosity of the liquid fertilizers were studied at wide temperatures (30-80оС). It was given the list of chemical compounds generated at ammonization of wet-processing phosphoric acid with various impurities. In order to reduce precipitation of residues during the neutralization 26% aqua suspension of bentonite was used as suspendered agent in amount of 1 to 3%. Rheological properties of the nitrogen-phosphate solution show that they are in liquid condition.

Automated Fire Safety System At The Cotton Gin Industry ., Sh.Z Kamalov, N.Z Kamalov

Chemical Technology, Control and Management

The issues of automating the safety of machines and mechanisms involved in the process of primary processing of raw cotton are considered on the example of the process of pneumatic transport of cotton materials. The proposed automated system for ensuring fire safety of cotton materials moving in pneumatic lines, providing automatic detection of burning cotton materials and preventing their wide distribution.

Estimation Of The Covariation Matrix Of Disturbances At The Entrance Of The Controlled Object On The Basis Of Iterative Algorithms ., O.O Zaripov, O.P Shukurova

Chemical Technology, Control and Management

The problems of formation and construction of stable algorithms for estimating the covariance matrices of input disturbances of the control object based on the methods of successive approximations are considered. Algorithms for the stable estimation of covariance matrices of perturbations at the input of an object are presented based on the concepts of iterative algorithms. The regular algorithms given above make it possible to produce a stable estimation of the covariance matrix of the object noise based on the concepts of the synthesis of adaptive filters and thereby increase the accuracy of the adaptive estimation procedure.

Optimization Of Data Processing Based On Accounting For Factors Of External Expenses, Regulation And Correction Of Variables ., I.I Jumanov, S.M Xolmonov

Chemical Technology, Control and Management

Methods and simplified computational schemes for optimizing data processing for systems operating in conditions of limited a priori information, changes in the characteristics of external influences, uncertainty of parameters have been developed. To describe a non-stationary object, non-linear identification models are considered, constraints, input conditions for obtaining possible values of output variables are defined. An approach aimed at using identification technologies based on generalization of capabilities of dynamic models, neural networks (NN), mechanisms for regulating variable computing schemes of structural network components, as well as learning algorithms of the NN is proposed. A generalized algorithm for learning NN based on …

The Task Of Stabilizing Drying With The Help Of Accumulation Material In Case Of Overheating Of The Chamber Under The Action Of Sunlight ., K.T Norkulova, M.M Mamatkulov, B.M Jumaev

Chemical Technology, Control and Management

The article deals with the possibilities of temperature stabilization inside the drying chamber with the help of materials having corresponding melting temperatures. The problem of the melting of accumulating material under the action of solar rays is investigated analytically. A precise and approximate solution of the problem of the propagation velocity of the melting boundary is presented. The application of the similarity method for solving the problem of the melting of a paraffin layer is shown. A reduced equation is obtained, which makes it possible to obtain numerical and graphical solutions. Particular cases of the solution of problems on the …

Synthesis Of 2,5-Dimethylhexine-3-Diol-2.5 By A Heterogeneous Catalytic Method And Its Some Physical And Chemical Properties ., A.T Umrzokov, B.F Muhiddinov, H.M Vopoev, S.E Nurmonov

Chemical Technology, Control and Management

The article examines the processes of heterogeneous-catalytic interaction of acetylene and acetone with the formation of 2,5-dimethylhexin-3-diol-2,5 using copper-bismuth-nickel-kaolin (MVNK) and copper-bismuth-nickel-bentonite (MVNB) catalysts physicochemical constants were determined depending on their nature, content and temperature of the reactions. Quantum-chemical calculations were carried out and the reaction centers of the molecules were shown on their basis.

Application Of Properties Of Ion Exchange Resing In Sorption Process Of Gold Exstraction ., T.V Ponamaryova, P.I Kushnazarov

Chemical Technology, Control and Management

The application of ion-exchange resins in the sorption process of gold recovery is considered. Presented are: scheme of technological process of synthesis of effective ion exchanger of phospholized gossypol resin; regime of technology for obtaining ion exchanger; technical characteristics of the FGS ionite on the basis of the gossypol resin of the fat and oil industry TSh 86-38: 2006. As a result of the studies carried out during the synthesis, an effective ion exchanger ion is obtained for the extraction of precious metal ions.

Two-Level Fuzzy Adaptive Regulation Of Dynamic Objects ., I.Kh Sidikov, B.U Shomirzaev

Chemical Technology, Control and Management

The questions of constructing and tuning adaptive fuzzy PID-controllers that are widely used in automatic control systems of technological processes in various industries are considered. The method of fuzzy adaption of regulator settings, taking into account the nonlinear properties of the object, is proposed. The optimal values of the PID controller parameters and fuzzy adaptation factor coefficients are determined, which ensure the required quality of the transient process in a closed system with a fuzzy adaptive regulator

A Two - Integrated System Of Slaveed Control Of The Speed Of Adjustable Multiple Motoring Electric Drive Water- Removable Pump Installatio ., M.M Xamudxanov

Chemical Technology, Control and Management

The article discusses the automatic control system of an adjustable multi-motor electric drive with an electrical connection through a rotor circuit of asynchronous motors with phase rotors and a common inverter driven by a network to provide control of the water supply process of pumping units as part of a water-lifting pumping unit. The system "multi-motor electric drive - pumps - hydraulic pressure net" was developed, equations describing the dynamics of the system were obtained, and the transfer functions of its main elements were determined.

Integrated Intelligent Systems For Industrial Automation: The Challenges Of Industry 4.0, Information Granulation And Understanding Agents ., N.R Yusupbekov, V.B Tarassov

Chemical Technology, Control and Management

The objective of the paper consists in considering the challenges of new automation paradigm Industry 4.0 and reviewing the-state-of-the-art in the field of its enabling information and communication technologies, including Cyberphysical Systems, Cloud Computing, Internet of Things and Big Data. Some ways of multi-dimensional, multi-faceted industrial Big Data representation and analysis are suggested. The fundamentals of Big Data processing with using Granular Computing techniques have been developed. The problem of constructing special cognitive tools to build artificial understanding agents for Integrated Intelligent Enterprises has been faced.

Fuzzy-Multiple Tasks Of Multicriterial Optimization In Risk Conditions ., T.F Bekmuratov, D.T Mukhamedieva

Chemical Technology, Control and Management

Approaches to solving the optimization problem and solving a fuzzy multicriteria optimization problem under risk conditions are considered. To assess risks in fuzzy conditions, it is proposed to supplement the system of constraints of a standard decision-making task with a set of restrictions on possible losses, namely, for selected scenarios, to build a model of their consequences (damages) as functions of control parameters and impose expert limitations on an acceptable level of relative damage for each scenario.

Optimization Of The Process Of Functioning Of Multiservice Networks ., A.R Marakhimov, G.B Sherboboyeva

Chemical Technology, Control and Management

In order to optimize the delay time of information flows in the nodes, multiservice networks propose the application of the theory of fuzzy sets, with the help of which models are developed for calculating the delay time, taking into account the inaccuracy of time, simple, correct operation and aging of information. A fuzzy model for calculating the average message delay time through communication nodes in multiservice networks is given, with each channel of switching nodes being modeled as a queuing network. A single-criterion problem of the optimal distribution of information flows over the channels of switching nodes with ill-defined data …

A Companion Study Guide For The Cisco Dcicn Data Center Certification Exam (200-150), Miguel Ramlatchan

Distance Learning Faculty & Staff Books

The official Cisco DCICN book and practice exams are great resources, but this is not an easy exam. This study guide is a companion to those resources and summarizes the subject areas into additional review questions with an answer description for each item. This book is not a "braindump" and it is not bootleg screenshots of the actual exam. Instead, this book provides additional context and examples, serves to complement other study guides, and provides additional examples. If you are getting ready to take the exam for the first time, I hope that this guide provides the extra help to …

1996 - Monterey County Hydrogeologic Study, Volume Ii -- Critical Issues Report And Interim Management Plan, Final Report

Monterey County Water Resources Agency Engineering Reports

This document was a companion report to the North Monterey County Hydrogeologic Study, Volume I, dated October 1995. The document built from the technical understanding and problem identification developed in Volume I and focuses on key issues relative to developing a management plan for the water resources of the area. These included the interrelated policy, legal and financial issues that complicate the management of the resource. The purpose of the report was to provide an analysis of these issues towards the development of long-range management objectives.

Interpolation And Extrapolation Of Missing Antenna Measurement Datasets Using The Cauchy Method And Matrix Pencil Method, Nicolas Reginelli

Theses - ALL

As electromagnetic systems become more complex, the computational time and power required to solve these large problems will also increase. It is thus of practical interest to apply methods of interpolation and extrapolation to reduce the amount of data required for accurate computation. Two such approaches of the implementation of interpolation and extrapolation examined in this thesis are the Cauchy method and the Matrix Pencil method.

This thesis explores the theory, process, and application of the Cauchy method and Matrix Pencil method in interpolating and extrapolating performance metrics of various electromagnetic systems. The Cauchy method begins by assuming that an …

Machine Learning Methods For Functional Near Infrared Spectroscopy, Danushka Sandaruwan Bandara

Dissertations - ALL

Identification of user state is of interest in a wide range of disciplines that fall under the umbrella of human machine interaction. Functional Near Infra-Red Spectroscopy (fNIRS) device is a relatively new device that enables inference of brain activity through non-invasively pulsing infra-red light into the brain. The fNIRS device is particularly useful as it has a better spatial resolution than the Electroencephalograph (EEG) device that is most commonly used in Human Computer Interaction studies under ecologically valid settings. But this key advantage of fNIRS device is underutilized in current literature in the fNIRS domain.

We propose machine learning methods …

A Smart Products Lifecycle Management (Splm) Framework - Modeling For Conceptualization, Interoperability, And Modularity, Yunpeng Li

Dissertations - ALL

Autonomy and intelligence have been built into many of today’s mechatronic products, taking advantage of low-cost sensors and advanced data analytics technologies. Design of product intelligence (enabled by analytics capabilities) is no longer a trivial or additional option for the product development. The objective of this research is aimed at addressing the challenges raised by the new data-driven design paradigm for smart products development, in which the product itself and the smartness require to be carefully co-constructed.

A smart product can be seen as specific compositions and configurations of its physical components to form the body, its analytics models to …

On Classification In Human-Driven And Data-Driven Systems, Qunwei Li

Dissertations - ALL

Classification systems are ubiquitous, and the design of effective classification algorithms has been an even more active area of research since the emergence of machine learning techniques. Despite the significant efforts devoted to training and feature selection in classification systems, misclassifications do occur and their effects can be critical in various applications. The central goal of this thesis is to analyze classification problems in human-driven and data-driven systems, with potentially unreliable components and design effective strategies to ensure reliable and effective classification algorithms in such systems. The components/agents in the system can be machines and/or humans. The system components can …

Efficient Machine Learning: Models And Accelerations, Zhe Li

Dissertations - ALL

One of the key enablers of the recent unprecedented success of machine learning is the adoption of very large models. Modern machine learning models typically consist of multiple cascaded layers such as deep neural networks, and at least millions to hundreds of millions of parameters (i.e., weights) for the entire model. The larger-scale model tend to enable the extraction of more complex high-level features, and therefore, lead to a significant improvement of the overall accuracy. On the other side, the layered deep structure and large model sizes also demand to increase computational capability and memory requirements. In order to achieve …

Laboratory Study On The Strength Behaviour Of Two Laterally Loaded Adobe Walls, Brad D. Weldon, Paola Bandini, Michael J. Mcginnis, Eduardo Dávila, Diego I. Garcia Vera

Civil Engineering Faculty Publications and Presentations

Adobe is a traditional construction technique found in historic and new construction throughout the world, often in earthquake-prone regions. Adobe structures are particularly susceptible to seismic forces due to their substantial mass and low tensile capacity. In addition, adobe is affected negatively by moisture that may penetrate from the ground or through the plaster. This paper describes the preliminary findings of an experimental program to investigate the effect of higher water content in the lower part of the wall on the wall strength behaviour under lateral loading. Lateral load tests were conducted on two quarter-scale adobe walls, one in air-dry …

1998 - Salinas Valley Water (Preliminary Analysis Of) The Cause And Cost Of Seawater Intrusion

Miscellaneous Monterey and San Luis Obispo County Documents and Reports

An analysis of the historical cause of seawater intrusion in the Pressure Area of Monterey County. An annual overdraft of groundwater resources near the coast coupled with a seasonal cycle of over pumping created a reversal in the groundwater gradient and associated cones of depression. "Marine intrusion has occurred in the 180-foot aquifer in recent years as a result of overdrafts." (Bulletin 52, 1946, p.27). The only overdrafts on groundwater in the Salinas Valley were in the East Side and Pressure Areas. "There was no shortage of groundwater in the remainder of the basin and no threat of deficiency under …

1995 - North Monterey County Hydrogeologic Study Volume I, Water Resource

Monterey County Water Resources Agency Engineering Reports

The purpose of the investigation was to develop a better understanding of the hydrogeologic setting in the North Monterey County (North County) area and to quantify the various components of water supply and demand. The investigation also focused on the institutional and planning issues associated with the resource limitations and suggests possible responses to these limitations. The investigation was intended to provide the Monterey County Water Resources Agency (MCWRA), as well as the Monterey County Departments of Planning, Building & Inspection and Division of Environmental Health, with data essential to developing a ground water management plan and to support modifications …

2018 - Groundwater Management In California, Michael Hanemann

Related Research and Documents

In 2014, the California legislature for the first time took some steps to create a framework for regulating groundwater pumping in over-drafted basins by adopting the Sustainable Groundwater Management Act (SGMA), representing California's first statewide groundwater management planning program. SGMA called for local agencies to develop groundwater sustainability plans within the next five to seven years and then achieve sustainable levels of groundwater extraction by approximately 2040 to 2045. California's prior efforts to regulate groundwater extraction is discussed, as well as groundwater depletion.