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An Optimal Control Method Of Icestorage Air Conditioning Based On Sequential Reduction In Direct Cooling Cost, Yongjun Zhang, Qilin Li, Jianang Huang

Journal of Electric Power Science and Technology

Among optimal control methods of icestorage air conditioning, control methods based on intelligent optimization algorithms are complicated to solve and lack of feasibility, and common engineering control methods are of poor economic benefit. To solve the above problems, in this paper, the mathematical model of the icestorage air conditioning optimal operation is built, in which the capacities of operation patterns and icestorage capacity are constraint conditions, and the minimum daily operation cost is the objective function. Then, an optimal control method based on the sequential reduction in direct cooling cost is proposed. Periods of storing or melting ice can be …

Microgrid Photovoltaic Current Control Strategy Based On Improved Robust Repetitive Control And Qpr, Jianfu Chen, Zhe Tan, Renliang Liu, Bing Chen, Rui Chen, Miao Chen, Hang Liao

Journal of Electric Power Science and Technology

In order to improve the power control performance of photovoltaic inverter in microgrid and improve the gridconnected current quality of photovoltaic power generation, the state space model of photovoltaic main circuit in microgrid with PVESS is established in this paper. Based on this model, the detailed design process of improved repetitive control and improved robust compensator are given to improve the structure of traditional repetitive control. In order to improve the stability and tracking accuracy of the control system, the robust compensator is added and the optimal configuration is obtained by the linear matrix inequality method. Then, combined with QPR, …

Research On Characteristics Of A Novel Ultrasparse Matrix Converter With Boost Circuit, Shengqing Li, Heng Zhang, Chaoxu Luo, Chenyang Wang

Journal of Electric Power Science and Technology

Aiming at the low voltage transmission of Ultra Spare Matrix Converter (USMC), a new topology of USMC with Boost boost circuit is proposed. The Boost circuit is added in the DC link of USMC to increase the output voltage of DC link, so that the inverter stage can output a higher voltage. Thereby, the voltage transmission ratio range is widen. In addition, combined with the SVPWM modulation strategy, the voltage transmission ratio and output power factor range of the new USMC topology are derived. It lays a theoretical foundation for the application of USMC. Finally, the Matlab/Simulink simulation is included …

Study On The Eddy Current Loss Of Internal Components Of 12 Kv Switch Cabinet, Yu Quan, Ken Jin, Tong Lin, Ruohan Gong, Zhiye Du

Journal of Electric Power Science and Technology

In the operation of large current switch cabinet, the thermal phenomena caused by eddy current losses is serious. In order to study the eddy current loss in the switch cabinet, a calculation method of eddy current loss is derived in this paper. Then a simplified switch cabinet model for the magnetic field calculation is established by SolidWorks. In addition, the losses of busbar in AC and DC load conditions are calculated through the finite element simulation software. It is found that the skin effect and proximity effect have influences on the busbar heating. Then the eddy current field of the …

Simulation Study On Lightning Overvoltage Characteristics Of Equipment In The Substation Connection Section, Ruifa Feng, Hansheng Cai, Minchuan Liao, Yutang Ma, Lu Qu, Gang Liu, Lei Jia

Journal of Electric Power Science and Technology

In order to determine the lightning impulse withstand level of substation connection section equipment reasonably, a transmission linesubstation connection section model considering the power frequency voltage and induced voltage is established in EMTP. Then the characteristics of shielding failure invasion wave and back striking invasion wave are calculated, and the influence of lightning current model, induced voltage and insulator string flashover model on substation connection section are studied. The simulation results show that the severe overvoltage under maximum shielding failure lightning current should be taken into consideration when checking the insulation withstand level of equipment, and the equipment withstand voltage …

Sector Electricity Consumption Behavior Features Based Abnormal Electricity Consumption Detection Method For Street Lamps, Yining Yang, Yang Xue, Yinghui Xu, Runan Song, Sheng Su

Journal of Electric Power Science and Technology

Datadriven abnormal electricity usage detection generally classifies or clusters user electricity usage behavior according to the set characteristic index items to identify electricity usage anomalies. Affected by the diversity of electricity usage behaviors in different sectors, there is often a problem of high false alarm rate in practical applications. Utilizing the characteristics of similar electricity usage behaviors of users in similar subindustry, this paper proposes a method that refines characteristic index items to detect abnormal electricity usage based on industryspecific electricity usage characteristics. Based on the actual load data of the users of the street lamp, firstly the load composition …

2021-August-26-Carter Railroad Museum August Heritage Day.Pdf, University Marketing And Communication, East Tennessee State University

ETSU News

JOHNSON CITY (Aug. 26, 2021) – The “Wild West” is the theme of this month’s Heritage Day at East Tennessee State University’s George L. Carter Railroad Museum this Saturday, Aug. 28.

One of the highlights of this free monthly event at the museum, located in ETSU’s Campus Center Building, will be models of the world’s largest steam engine, the Union Pacific Railroad’s 4-8-8-4 Big Boy design made famous during World War II. This, as well as equipment from other famous operations like the Santa Fe, Southern Pacific and today’s Union Pacific and BNSF super railroads, will make this an event …

Embedding Sustainability Literacy In Business School Curricula Through Reflective Pedagogy: An Exploratory Study Of Student Reflections Of The Sulitest, Ciara Nolan Dr, Cormac H. Macmahon, Olivia Freeman, Alacoque Mcalpine, Lucia Walsh, Deirdre Duffy Dr

Conference papers

Purpose

Sustainability has emerged as a megatrend affecting all aspects of management practice. SDG 4.7 has mandated business schools to provide education for responsible leadership and to integrate sustainability principles in their curricula. Faculty are challenged to mainstream sustainability through engaging pedagogy that inspires and offers concrete tools. Yet, pedagogy has been viewed as a key challenge to embedding sustainability in management education.

Design / Methodology / Approach

We highlight the role of reflection in promoting the enhancement of sustainability literacy in business school curricula, supporting our proposition that management education for sustainability must have a reflective dimension that engages …

Optimal Planning Of Integrated Energy System Considering Carbon Emission Penalty Factor, Ming Wen, Zibin Hu, Yilin Long, Yong Li, Tong Jiang, Yahui Wang

Journal of Electric Power Science and Technology

The energy industry accounts for a large proportion of carbon emissions and it is the main force of energy conservation and emission reduction. In order to ensure the sustainable development of the system, it is necessary to take carbon emissions into account when planning the integrated energy system. Under the backgound, an integrated energy system planning model is established in this paper considering carbon emission penalty factor. Firstly, according to the thermal and electrical load characteristics of a park, four planning schemes are proposed in this paper. The minimum net present cost is chosen as the optimization objective, the optimal …

Perbandingan Efektivitas Pektin Kulit Durian (Durio Zibethinus L.) Dan Pektin Kulit Pisang Kepok (Musa Acuminata X Balbisiana Abb Group) Sebagai Bioadsorben Logam Timbal, Hesty Nuur Hanifah, Ginayanti Hadiesoebroto, Lingga Ardhana Reswari, Jenia A. V. Do R. M. Neves

Chimica et Natura Acta

Timbal merupakan salah satu logam berat yang banyak terdapat di dalam limbah cair yang berasal dari industri atau laboratorium. Logam Pb jika tidak diolah dengan baik akan menimbulkan pencemaran lingkungan serta meracuni makhluk hidup yang ada disekitarnya. Salah satu pengolahan limbah yang mengandung logam berat adalah penggunaan bahan-bahan biologis sebagai bioadsorben. Pektin merupakan salah satu senyawa yang  terdapat pada dinding sel tumbuhan dan mempunyai banyak gugus fungsi, sehingga cocok untuk dijadikan sebagai bioadsorben logam Pb. Tujuan dari penelitian ini adalah untuk membandingkan efektivitas bioadsorben dari pektin kulit durian dan pektin kulit pisang melalui penentuan pH optimum, waktu kontak optimum, dan …

Forewarning Of Vegetation Growth In Transmission Corridor Based On High Resolution Satellite Images, Fenglian Liu, Yongxing Cao, Runming Gao, Jun Zhu, Xianghang Bu

Journal of Electric Power Science and Technology

In order to extract the information of transmission corridor from satellite images, a method based on the highresolution remote sensing image No. 2 is proposed. Firstly, the weighted grayscale transformation based on lowresolution multispectral images is applied to obtain binary images. The information of transmission lines and towers is extracted by image edge detection and line detection methods. Then, the fused highresolution images are identified by the minimum distance method, and the vegetation coverage index is calculated. Finally, the transmission line is reconstructed in the vegetation distribution image, and the vegetation coverage index is utilized to warn the vegetation threatening …

Reliability Evaluation And Failure Characteristics Of Electric Power Utility., A. Aly

Mansoura Engineering Journal

Reliability evaluation fundamentals are necessary for a quantitative reliability evaluation in electric power systems. This paper includes a description of the procedure for system reliability analysis. An important aspect of power system design involves consideration of the service reliability requirements of loads, which are to be supplied and the service reliability, which will be provided by any proposed system. A knowledge of the reliability of electrical equipment has an important consideration in the design of power system for industrial plants. Ideally, these reliability data should come from a field used of the same type of equipment under similar environmental conditions …

Travel Demand Forecasting To Predict Parking Behavior At University Campuses: A Case Study At The University Of Texas At Tyler, Sohil Paudel

Civil Engineering Theses

With limited capacity, space, and funds to expand parking facilities, there is a dire need to better understand parking behavior at university campuses so that universities can better utilize the limited resources available. One methodology, travel demand forecasting, could be used to predict parking demand at a university campus. For this study, the University of Texas at Tyler campus was used as a case study. Each parking lot on campus was assigned to one parking zone based on the nearest classroom building. Next, pneumatic tube counters were used to collect the number of originating and departing vehicles from each zone. …

Research On Port Call Processes To Enable Just-In-Time Arrival Based On Container Shipping Case Study In The Port Of Shanghai, Yang Chen

World Maritime University Dissertations

No abstract provided.

Improved Voltage Feedforward Method For Improving Robust Stability Of Gridconnected Inverters In Weak Grids, Bo Chen, Chengbi Zeng, Hong Miao, Hong Chang

Journal of Electric Power Science and Technology

Due to the existence of grid impedance in a weak grid, the application of voltage feedforward control can adversely affect the stability of the inverter system. In order to preserve the advantages of voltage feedforward control, according to the impedance stability analysis method, the problems in adopting voltage feedforward control under grid impedance variation in weak grids are studied. Instability mechanism and unstable region are also presented. Based on the analysis, a phase lead compensation method is proposed to reduce the unstable region caused by voltage feedforward control, increase the phase angle of the inverter output impedance, and safeguard strong …

An Identification Method For Spring Energy Storage Fault Of Onload Tap Changer Based On Neural Network Response Surface Model, Zhiyuan Liu, Hui Miao, Xiaojun Yu, Hongsen Zou, Dapeng Chen

Journal of Electric Power Science and Technology

In order to precisely identify the spring energy storage failure in an onload tap changer (OLTC), an identification method is developed for spring energy storage failure of the OLTC based on the neural network response surface model. Firstly, the fault simulation model of the OLTC was established through the finite element method. Then, the training samples of the response surface model were generated from the uniform experiments and simulations, and the neural network response surface model was therefore constructed by training these samples. Finally, the mechanical parameters of the spring energy storage deficiency were identified using the multiobjective identification algorithm …

Optimal Operation Of The Park Integrated Energy System Considering Integrated Demand Response, Xueting Bai, Ruiqi Yang, Zechun Chen, Dechang Yang

Journal of Electric Power Science and Technology

In order to improve the ability of integrated energy system to absorb new energy and reduce system operating cost,an optimal scheduling model is proposed by considering the integrated demand response and the integrated energy system of industrial park is taken as the research object. Firstly, the basic model of the park integrated energy system including CHP unit, gas boiler, electric boiler and other coupled equipment is established, and the flexible loads on the demand side of the system are divided into three types: transferable loads, interruptible loads, and replaceable loads. Among them, replaceable loads realizes the coordination and interaction between …

Power Load Dispatching Research Based On Community Energy Platform, Meixia Zhang, Xuyan Huang, Xiu Yang

Journal of Electric Power Science and Technology

In view of the fact that the current community load is high and the load peak and offpeak difference is increasing in summer, community load is regulated by invoking demand response resources. This paper mainly studies the controllable power load (resident, commerce) scheduling strategy in the community energy platform. Focusing on the analysis of two types of loads, electric vehicles and air conditioning, this paper constructs a multiobjective load optimization dispatch model with the lowest electricity cost and the smallest difference between community load peaks and valleys under the satisfaction of user comfort level. For the resident inverter air conditioning …

Midlong Term Contract Energy Decomposition Considering Wind Power Uncertainty, Jun Liu, Jianrong Gong, Yu Sun, Zimo Xia, Chao Yuan

Journal of Electric Power Science and Technology

Midlong term contract energy transaction is the main form of transaction in the early stage of new round electricity reform. Due to the uncertainty of wind power, midlong term contract energy decomposition faces enormous challenges. To solve this problem, a midlong term contract energy decomposition algorithm considering the uncertainty of wind power is proposed. An optimization model for a dayahead energy decomposition with minimum generation costs, power offsets, and carbon emissions is established and transformed into a singleobjective model through a normalized weighting method. Then the issue of the deviation between the actual energy generation and the planned energy is …

Distributed Wind Power Bilevel Programming Model For Active Distribution Network Based On Stochastic Fuzzy Chance Constraint, Rui Ma, Xinyi Luo, Linxiang Xiao

Journal of Electric Power Science and Technology

Aiming at the multiple uncertain features of wind speed with both randomness and ambiguity, a distributed wind power bilevel programming model for active distribution network (ADN) based on stochastic fuzzy chance constraint is proposed. Considering the multiple uncertainty characteristics which contains both randomness and fuzziness of wind speed, firstly, the article describes the uncertainty of distributed wind power output through random fuzzy simulation, established a random fuzzy model of wind power output by considering the time sequence,obtains the chance measure of static security index by random fuzzy simulation and power flow analysis, uses reliability which contains both randomness and fuzziness …

Denoising Of Insulator Hydrophobic Image Based On The Guided Filtering Algorithm, Wenhai Yuan, Biao Liu, Zhe Wang, Tao Sai, Kunfeng Song, Xin Xia, Feng Wang, Lipeng Zhong

Journal of Electric Power Science and Technology

The hydrophobic detection of composite insulators is an important means to ensure the safe and reliable op-eration of insulators. The effective elimination of noise from hydrophobic images is an important prerequisite for accu-rately extracting the edge of water droplets and realizing the hydrophobic identification of insulators. The guiding fil-tering algorithm is widely applied in the field of image processing because of its intuitive principle, low computationalcomplexity and its ability to effectively overcome the gradient inversion problem by the guiding image filtering. In thiscontext, the principle of guided filtering is analyzed firstly. Then, it is introduced into the denoising process of …

A Model Of Occupational Licensing And Statistical Discrimination, Peter Q. Blair, Bobby W. Chung

Upjohn Institute Working Papers

We develop a model of statistical discrimination in occupational licensing. In the model, there is endogenous occupation selection and wage determination that depends on how costly it is to obtain the license and the productivity of the human capital that is bundled with the license. Under these assumptions, we find a unique equilibrium with sharp comparative statics for the licensing premiums. The key theoretical result in this paper is that the licensing premium is higher for workers who are members of demographic groups that face a higher cost of licensing. The intuition for this result is that the higher cost …

Tuning Protein Dynamics To Sense Rapid Endoplasmic-Reticulum Calcium Dynamics, Xiaonan Deng, Xin-Qiu Joe Yao, Ken Berglund, Bin Dong, Daniel Ouedraogo, Mohammad A. Ghane, You Zhuo, Cheyenne Mcbean, Zheng Zachory Wei, Samer Gozem, Shan P. Yu, Ling Wei, Ning Fang, Angela M. Mabb, Giovanni Gadda, Donald Hamelberg, Jenny J. Yang

Chemistry Faculty Publications

Multi-scale calcium (Ca2+) dynamics, exhibiting wide-ranging temporal kinetics, constitutes a ubiquitous mode of signal transduction. We report a novel endoplasmic-reticulum (ER)-targeted Ca2+ indicator, R-CatchER, which showed superior kinetics in vitro (koff≥2×103 s−1, kon≥7×106 M−1 s−1) and in multiple cell types. R-CatchER captured spatiotemporal ER Ca2+ dynamics in neurons and hotspots at dendritic branchpoints, enabled the first report of ER Ca2+ oscillations mediated by calcium sensing receptors (CaSRs), and revealed ER Ca2+-based functional cooperativity of CaSR. We elucidate the mechanism of R-CatchER and propose a principle to rationally design genetically encoded Ca2+ indicators with a single Ca2+-binding site …

The Third Generation Of Pan-Canadian Wetland Map At 10 M Resolution Using Multisource Earth Observation Data On Cloud Computing Platform, Masoud Mahdianpari, Brian Brisco, Jean Granger, Fariba Mohammadimanesh, Bahram Salehi, Saeid Homayouni, Laura Bourgeau-Chavez

Michigan Tech Publications, Part 1

Development of the Canadian Wetland Inventory Map (CWIM) has thus far proceeded over two generations, reporting the extent and location of bog, fen, swamp, marsh, and water wetlands across the country with increasing accuracy. Each generation of this training inventory has improved the previous results by including additional reference wetland data and focusing on processing at the scale of ecozone, which represent ecologically distinct regions of Canada. The first and second generations attained relatively highly accurate results with an average approaching 86% though some overestimated wetland extents, particularly of the swamp class. The current research represents a third refinement of …

Study On Magnetic Control Systems Of Micro-Robots, Youjia Shao, Ashraf Fahmy, M Li, C Li, Wencang Zhao, Johann Sienz

School of Engineering, Computing and Mathematics

Magnetic control systems of micro-robots have recently blossomed as one of the most thrilling areas in the field of medical treatment. For the sake of learning how to apply relevant technologies in medical services, we systematically review pioneering works published in the past and divide magnetic control systems into three categories: stationary electromagnet control systems, permanent magnet control systems and mobile electromagnet control systems. Based on this, we ulteriorly analyze and illustrate their respective strengths and weaknesses. Furthermore, aiming at surmounting the instability of magnetic control system, we utilize SolidWorks2020 software to partially modify the SAMM system to make its …

An Out Of This World Experience, Rebecca Irelan

UNH Today Archive

No abstract provided.

Triangle Journal News, Volume 9, Number 4

Triangle Journal News, 1990-2006

Co-Editors: Allen Cook, John Stilwell. Staff Writers: Vincent Astor, Ira L. King. Contributors: David Bianco, Paula Martinac, Romeo St. Vicente, Butch Valentine, Jim Maynard, Doyle Richmond. Production: Vincent Astor, Allen Cook, Bob Dumais, John Stilwell. Advertising: Vincent Astor, Bob Dumais.

Special thanks to Rhodes College and the Paul Barret Jr. Library for providing initial scanning of this collection.

Triangle Journal News, Volume 9, Number 5

Triangle Journal News, 1990-2006

Co-Editors: Allen Cook, John Stilwell. Staff Writers: Vincent Astor, Ira L. King. Contributors: David Bianco, Paula Martinac, Romeo St. Vicente, Butch Valentine, Kerry Lobel, Jim Maynard, Doyle Richmond. Production: Vincent Astor, Allen Cook, Bob Dumais, John Stilwell. Advertising: Vincent Astor, Bob Dumais.

Special thanks to Rhodes College and the Paul Barret Jr. Library for providing initial scanning of this collection.

Singlet Fission In Acene Blends, Katharina Broch, Clemens Zeiser, Chad Cruz, Luca Moretti, Margherita Maiuri, Eric Chronister, David Reichman, Roel Tempelaar, Giulio Cerullo, Christopher Bardeen

Chemistry and Biochemistry Faculty Research

Singlet fission (SF), the photophysical process converting an excited singlet exciton into two triplet excitons, is a promising approach to boost solar cell efficiencies. It is controlled by various parameters such as intermolecular interactions, energetics, entropy and vibronic coupling and a controlled modification of these parameters is key to a fundamental understanding. Blends of organic semiconductors present an interesting alternative to established methods of chemical functionalization and their potential for the study of SF pathways will be discussed using acene blends as example. Mixed thin films of SF chromophores and weakly interacting, high-bandgap spacer molecules allow one to study the …

Awareness And Use Of Bibliographic Database Among Undergraduate And Postgraduate Students In Federaluniversity Of Agriculture, Abeokuta [Funaab], Maria E. Ilori Mrs, Fehintola N. Onifade Dr., Emmanuel O. Ekundayo Mr., Segun V. Oluwafemi Mr

Library Philosophy and Practice (e-journal)

Awareness is core to usage of bibliographic database by students. In spite of the value derived from use of bibliography database which serves as skills for any academic research work. It is observed that there is low level of awareness and use of these databases that powered electronic learning among undergraduate and postgraduate students. This study examined awareness and use of bibliographic database among undergraduate and postgraduate students in Federal University of Agriculture, Abeokuta [FUNAAB]. The study adopted survey research design with use of structured questionnaire. Convenient sampling technique was used to select nine colleges for the study, 495 …