BBC Russian

Preprint ARTICLE | doi:10.20944/preprints202409.1243.v1

Research on the Influence of Matrix Shape on Percolation Threshold Values for Current Flow Conducted Using the Monte Carlo Simulation Method

Vitalii Bondariev, Pawel Okal, Przemyslaw Rogalski, Alexander Pogrebnjak, Pawel Zukowski

Subject: Chemistry And Materials Science, Nanotechnology Keywords: percolation; conductivity; nanocomposite; matrix; simulation

Online: 17 September 2024 (02:56:02 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202204.0275.v1

Ancillary Service of Voltage Support for a Weak Medium Voltage Grid through Injected Distributed Generation

Syed Muhammad Aizaz Haider, Muhammad Hassan Yousuf, Asad Idrees, Muhammad Haseeb Khan, Faisal Saeed, Abdullah Zohaib, Ali Raza

Subject: Engineering, Electrical And Electronic Engineering Keywords: Voltage Regulation (VR); Distributed Generation (DG); Renewable Energy Sources (RES); Voltage Regulation (VR); Ancillary Service

Online: 28 April 2022 (08:36:36 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201710.0009.v1

Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables - An Empirical Study with Defects at Semicon-Dielectric Interface

Aditya Shekhar, Xianyong Feng, Angelo Gattozzi, Robert Hebner, Douglas R. Wardell, Shannon Strank, Armando Rodrigo-Mor, Laura M. Ramirez-Elizondo, Pavol Bauer

Subject: Engineering, Electrical And Electronic Engineering Keywords: ac; comparison; dc; discharges; measurements; medium voltage; pd; partial discharges

Online: 2 October 2017 (13:54:40 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202403.1099.v1

A Transient Voltage-based Approach for Mid-voltage Fault Detection through Low-voltage Sensors

Mingze ZHANG, Xinyu GUAN, Xin AI

Subject: Engineering, Electrical And Electronic Engineering Keywords: LV sensor measurement; non-effectively grounded system; single-phase-to-ground fault; transient aerial mode voltage

Online: 22 March 2024 (07:36:32 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202406.0720.v1

Optimization of division and reconfiguration locations of the medium-voltage power grid based on forecasting the level of load and generation from renewable energy sources

Karol Sidor, Piotr Miller, Robert Małkowski, Michał Przemysław Izdebski

Subject: Engineering, Electrical And Electronic Engineering Keywords: optimization; MV network configuration; power losses; forecasting; renewable energy

Online: 12 June 2024 (02:46:11 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202405.1490.v1

Influence of Moisture Content on Some Mechanical Properties of Maize

Manuel Moya, David Sánchez, José Ángel Romero, José Ramón Villar

Subject: Engineering, Architecture, Building And Construction Keywords: agricultural silos; numerical methods; mechanical properties; maize; angle of internal friction; specific weight; apparent cohesion; moisture content

Online: 23 May 2024 (07:25:48 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202401.1543.v1

Random Convolutional Kernel Transform with Empirical Mode Decomposition for Medium Voltage Insulator Classification based on Ultrasound Sensor

Anne Carolina Rodrigues Klaar, Laio Oriel Seman, Viviana Cocco Mariani, Leandro dos Santos Coelho

Subject: Engineering, Electrical And Electronic Engineering Keywords: Electric Power System; Empirical Mode Decomposition; Rocket Algorithm; Time Series Classification.

Online: 22 January 2024 (09:52:24 CET)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints202307.0333.v1

Detection Method of Partial Discharge on Transformer and Gas Insulated Switchgear: A Review

Zulbirri Faizol, Farid Zubir, Zubaida Yusoff, Norhafezaidi Mat Saman, Mohd Hafizi Ahmad, Mohamad Kamal A. Rahim, Osman Ayop, Muzammil Jusoh, Huda A. Majid

Subject: Engineering, Electrical And Electronic Engineering Keywords: partial discharge; power transformer; gas-insulated switchgear

Online: 6 July 2023 (03:49:21 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202111.0036.v1

Partial Discharge and Internet of Things: A Switchgear Cell Maintenance Application using Microclimate Sensors

Radu Fechet, Adrian Ioan Petrariu, Adrian Graur

Subject: Engineering, Electrical And Electronic Engineering Keywords: electrical grid; switchgear; preventive maintenance; IoT; partial discharge

Online: 2 November 2021 (10:33:39 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.1207.v1

Exceptional Strength-Ductility Combinations of a CoCrNi-Based Medium-Entropy Alloy via Short/Medium-Time Annealing after Hot-Rolling

Yongan Chen, Dazhao Li, Zhijie Yan, Shaobin Bai, Ruofei Xie, Jian Sheng, Jian Zhang, Shuai Li, Jinzhong Zhang

Subject: Engineering, Mechanical Engineering Keywords: medium-entropy alloy; precipitates; mechanical properties; deformation mechanisms

Online: 16 August 2024 (08:38:41 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202407.0038.v1

A Constant Voltage WPT System for AM-Modulated Implant Neural Stimulation

Zhiyang Cao, Shicong Gui, Chujia Xu, Rui Zhong, Zhaotan Lin, Yubo Li

Subject: Engineering, Electrical And Electronic Engineering Keywords: WPT; resonance inductive coupling; wireless neural stimulator; implant device

Online: 1 July 2024 (08:11:41 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202306.0942.v1

Detection and Classification of Partial Discharge by Hybrid Neural Network Algorithms in Air-insulated MV Switchgear

Paweł Kluge, Andrzej Łasica, Jacek Starzyński

Subject: Engineering, Electrical And Electronic Engineering Keywords: deep learning; partial discharge; convolutional neural network; medium voltage switchgear; air-insulated switchgear; autoencoder; long short-term memory

Online: 13 June 2023 (13:55:13 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202406.2036.v1

Development of Broad-Range Microbial Minimal Culture Medium for Lanthanide Studies

Gianmaria Oliva, Giovanni Vigliotta, Luca Di Stasio, Ermanno Vasca, Stefano Castiglione

Subject: Biology And Life Sciences, Biology And Biotechnology Keywords: REE; Bacillus stratosphericus; lanthanide toxicity; environmental screening; complexation equilibria; cerium; lanthanide accumulation; Debaryomyces hansenii

Online: 1 July 2024 (03:59:35 CEST)

Show abstract| Download PDF| Supplementary Files| Share

Preprint ARTICLE | doi:10.20944/preprints201702.0078.v1

Resonant Rectifier ICs for Piezoelectric Energy Harvesting Using Low-voltage Drop Diode Equivalents

Amad Ud Din, Seneke Chamith Chandrathna, Jong-Wook Lee

Subject: Engineering, Energy And Fuel Technology Keywords: AC-DC converters; energy harvesting; piezoelectric; rectifier

Online: 20 February 2017 (18:23:13 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201701.0078.v1

High Step-up Voltage Gain Converter with Ripple-free Input Current for Renewable Energy Sources

Zhangyong Chen, Yong Chen

Subject: Engineering, Electrical And Electronic Engineering Keywords: input current ripple-free; boost converter; coupled-inductor; voltage-doubler cell; passive lossless clamp circuits; high voltage gain; renewable energy

Online: 17 January 2017 (11:10:36 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201609.0042.v1

Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

Dongdong Zhang, Zhijing Zhang, Xingliang Jiang, Zhongyi Yang, Jiayao Zhao, Yongfu Li

Subject: Engineering, Electrical And Electronic Engineering Keywords: insulator; pollution flashover; equivalent salt deposit density (ESDD); soluble constituent; flashover voltage gradient

Online: 12 September 2016 (10:47:42 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202405.1933.v1

On-target Deposition from Two Engine-Powered Sprayers in Medium Foliage Density Citrus Canopies

Peter Ako Larbi

Subject: Engineering, Other Keywords: air-assistance; airblast sprayer; application rate; fluorometry; spray penetration

Online: 29 May 2024 (07:45:21 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202409.0934.v1

Synthesis of Novel Fe-CNs-P/S Carbon Materials for Sustainable Water Treatment: Activation of Persulfate for Efficient TC Degradation

Huali Zhang, Kanghui Zhang, Qin Liu, Tongshan Shi, Jiaheng Cui, Jinxiu Li

Subject: Environmental And Earth Sciences, Environmental Science Keywords: Sustainable Water Treatment; NH2-MIL-101 (Fe); Carbon materials; Doping; Tetracycline (TC); Persulfate activation

Online: 12 September 2024 (13:10:08 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202409.0012.v1

Optimization of Acid-Producing Culture Medium for Collaborative Fermentation of Three Pit Mud Anaerobic Functional Bacteria

Chunhui Wei, Yilian Tu, Jun Xie, Zhi Huang

Subject: Biology And Life Sciences, Food Science And Technology Keywords: pit mud; anaerobic bacteria; caproic acid; butyric acid; optimization

Online: 2 September 2024 (13:31:19 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.1955.v1

Manufacturing and Functional Characterization of Graphite/Metal Composite Materials for High Voltage Electric Motors

Radu Mirea, Razvan Ene, Dragoș Ene

Subject: Chemistry And Materials Science, Materials Science And Technology Keywords: graphite; carbon-metal composites; high voltage; pitch

Online: 28 August 2024 (02:56:34 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202409.0528.v1

Four-Channel Integrated High-Voltage Power Supply for Dielectric Elastomer Actuators

Haoyue Xing, Qun Hao, Cancan Yao, Zitong Zhang, Jiafu Li, Yang Cheng

Subject: Engineering, Electrical And Electronic Engineering Keywords: Dielectric elastomer actuators; Electric amplifier; High voltage; DC-DC converter

Online: 6 September 2024 (10:57:10 CEST)

Show abstract| Download PDF| Supplementary Files| Share

Preprint ARTICLE | doi:10.20944/preprints202402.1695.v1

Modeling, Simulation, and Experimental Validation of Broad Input Output Range Three Voltage Level Rectifier

Yarden Oren, Eliav Dahan, Aaron Shmaryahu, Yishai Kellerman, Moshe Sitbon, Dmitry Baimel, And Ilan Aharon

Subject: Engineering, Electrical And Electronic Engineering Keywords: AC-DC; EV charger; Power factor correction; Rectifier; Three voltage levels

Online: 29 February 2024 (11:23:28 CET)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints202403.1137.v1

Research Status and Development Trends of Active Control Technology for Pantograph in High-Speed Railways

Shengdong Yu, Quan Sun, Dongyuan Zhang, Zan Jiang

Subject: Engineering, Transportation Science And Technology Keywords: High-speed railway; pantograph; active control; overhead contact system

Online: 19 March 2024 (11:25:51 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202409.1845.v1

Production of Oncolytic Measles Virus in Vero Cells: Impact of Culture Medium and Multiplicity of Infection

Dustin Eckhardt, Jana Mueller, Jonas Friedrich, Jan-Philip Klee, Irakli Sardlishvili, Lars Erik Walter, Stefanie Fey, Peter Czermak, Denise Salzig

Subject: Biology And Life Sciences, Virology Keywords: multiplicity of infection (MOI); media adaption; chemically-defined medium (CDM); serum-free medium (SFM); viral vaccines; vectors; virus-like particles (VLPs); cell culture research; process development

Online: 24 September 2024 (04:49:03 CEST)

Show abstract| Download PDF| Supplementary Files| Share

Preprint ARTICLE | doi:10.20944/preprints201612.0079.v1

A Broad-Area Method for Estimation of Upwelling Medium Wave Infrared for Fire Detection

Bryan Hally, Luke Wallace, Karin Reinke, Simon Jones

Subject: Environmental And Earth Sciences, Environmental Science Keywords: fire detection; upwelling radiation; diurnal variation; training data; geostationary sensors

Online: 15 December 2016 (09:22:10 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202403.0118.v1

Solid Phase Oligo-DNA Extraction from Complex Medium Using an Aminated Graphene/Nitrocellulose Membrane Hybrid

Alin Georgian Toader, Valentin Titus Grigorean, Ionita Mariana

Subject: Biology And Life Sciences, Biochemistry And Molecular Biology Keywords: nitrocellulose; fluorescence quenching; DNA extraction; aminated graphene; ions

Online: 4 March 2024 (10:36:50 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.0307.v1

A Grouping and Aggregation Modeling Method of Induction Motors for Transient Voltage Stability Analysis

Zhaowen Liang, Yongqiang Liu, Lili Mo, Yan Zhang

Subject: Engineering, Electrical And Electronic Engineering Keywords: Dynamic load modeling; Induction motor; Model reduction; Grouping and aggregation method; Transient voltage stability

Online: 6 August 2024 (10:40:24 CEST)

Show abstract| Download PDF| Share

Preprint COMMUNICATION | doi:10.20944/preprints202405.0366.v1

Direct Cold Sintering of α-Al₂O₃ Ceramics in a Pure Water Medium

Anastasia A. Kholodkova, Maxim V. Kornyushin, Arseniy N. Khrustalev, Levko A. Arbanas, Andrey V. Smirnov, Yurii D. Ivakin

Subject: Chemistry And Materials Science, Ceramics And Composites Keywords: gibbsite; boehmite; alumina; cold sintering process; porous ceramics

Online: 7 May 2024 (10:22:49 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202403.1876.v1

Regulation of cysteine homeostasis and its effect on Escherichia coli sensitivity to ciprofloxacin in LB medium

Galina Smirnova, Aleksey Tyulenev, Lyubov Sutormina, Tatyana Kalashnikova, Nadezda Muzyka, Vadim Ushakov, Zoya Samoilova, Oleg Oktyabrsky

Subject: Biology And Life Sciences, Immunology And Microbiology Keywords: cysteine homeostasis; glutathione; H2S; Fur and SOS regulons; growth; respiration; antibiotics; bacterial survival

Online: 1 April 2024 (10:18:59 CEST)

Show abstract| Download PDF| Supplementary Files| Share

Preprint ARTICLE | doi:10.20944/preprints202409.1787.v1

Influence of Al and Ti Alloying and Annealing on the Microstructure and Compressive Properties of Cr-Fe-Ni Medium-Entropy Alloy

Keyan An, Tailin Yang, Junjie Feng, Honglian Deng, Xiang Zhang, Zeyu Zhao, Qingkun Meng, Jiqiu Qi, FuXiang Wei, Yanwei Sui

Subject: Chemistry And Materials Science, Metals, Alloys And Metallurgy Keywords: high-entropy alloy; Al and Ti elements; annealing heat treatment; second phase strengthening; compressive properties

Online: 24 September 2024 (03:07:19 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202407.0704.v1

Workers’ Exposure to Chemical Risk in Small and Medium-Sized Enterprises: Assessment Methodology and Field Study

Daniel Onuț Badea, Doru Costin Darabont, Iulian Ivan, Vicențiu Ciocîrlea, Raluca Aurora Stepa, Oana Roxana Chivu

Subject: Public Health And Healthcare, Public, Environmental And Occupational Health Keywords: chemical hazards; occupational safety and health; risk assessment method workers

Online: 9 July 2024 (07:58:39 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202403.1348.v1

Driving Blockchain Adoption in Small and Medium Enterprise Sector: Introducing the Concept of “Transformation Conditions”

Helen Shun-mun WONG, Carmen Ka-man SUM, Hau-ling CHAN

Subject: Business, Economics And Management, Business And Management Keywords: blockchain; small and medium enterprises; transformation conditions

Online: 22 March 2024 (06:29:23 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202311.1177.v1

Regulation Law of Tempering Cooling Rate on Toughness of Medium Carbon Medium

Chao Yang, Ting-ting Xu, Hong-shan Zhao, Chun-dong Hu, Han Dong

Subject: Engineering, Metallurgy And Metallurgical Engineering Keywords: Temper embrittlement；Medium carbon medium alloy steel; Martensite; Bainite; toughness

Online: 17 November 2023 (14:53:38 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202407.0851.v1

Greening the Grassroots: Evaluating Environmental Management in Nigeria's Small and Medium-Sized Enterprises

Sunday Amiolemen, Olapeju Adenekan, Idowu Ologeh, Koleayo Omoyajowo, Oluseye Oludoye, Morufu Raimi

Subject: Environmental And Earth Sciences, Environmental Science Keywords: Environmental Management; SMEs; Environmental pollution; Eco-friendly innovation; Sustainable development

Online: 10 July 2024 (12:58:03 CEST)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints202402.0386.v1

Integrated Photonic Sensors with Enhanced Evanescent Field: Unveiling the Dynamic Interaction with the Ambient Medium

Muhammad A. Butt

Subject: Physical Sciences, Optics And Photonics Keywords: Evanescent field; photonic sensor; optical waveguide; light-matter interaction; absorption; mid-infrared.

Online: 6 February 2024 (15:36:54 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201703.0106.v1

Decision Optimization for Power Grid Operating Condition with High and Low Voltage Parallel Loops

Dong Yang, Kang Zhao, Hao Tian, Yutian Liu

Subject: Engineering, Electrical And Electronic Engineering Keywords: parallel loop; line switching; complex network theory; GN algorithm; comprehensive evaluation model

Online: 15 March 2017 (18:00:36 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202409.0232.v1

Characterization of Qu-aroma of Medium-High Temperature Daqu from Different Production Areas Using Sensory Evaluation, E-nose, and GC-MS/O Analysis

Jie Deng, Jia Zheng, Xing Li, Zhiguo Huang, Dan Huang, Guangbin Ye, Huibo Luo

Subject: Biology And Life Sciences, Food Science And Technology Keywords: Medium-High Temperature Daqu; Qu-aroma; Volatile compounds

Online: 4 September 2024 (03:08:27 CEST)

Show abstract| Download PDF| Share

BACKGROUND: Qu-aroma is a critical quality indicator for medium-high temperature Daqu (MT-Daqu), significantly influencing the aroma profile of strong-aroma Baijiu (SAB). SAB is produced across various regions in China, each with unique environmental conditions and production techniques. These regional differences are likely to cause variations in the Qu-aroma of MT-Daqu. Despite this, comprehensive research on the variations in Qu-aroma across different regions has been lacking. This study aims to address this gap by utilizing Gas Chromatography-Olfactometry-Mass Spectrometry (GC-O-MS) and electronic nose (E-nose) technology, combined with sensory evaluation, to analyze the differences in Qu-aroma characteristics and volatile compound profiles of MT-Daqu from seven distinct production areas.RESULTS: Sensory analysis identified seven broad aroma categories and 25 specific aromas characterizing the Qu-aroma of MT-Daqu samples. Chen aroma and roasted aroma were notably more prevalent in MT-Daqu samples from Sichuan compared to those from other regions (P < 0.05), while the fermentation aroma was less prominent in Sichuan samples. In total, 123 volatile compounds were detected in MT-Daqu, with 46 classified as aroma-active compounds. Among these, 21 aroma-active compounds were identified as markers distinguishing Sichuan MT-Daqu from those produced in non-Sichuan regions, showing significant differences in their concentrations (P < 0.05). Additionally, six major aroma-active compounds-ethyl isovalerate, ethyl heptanoate, hexanal, 1-nonanal, (E)-2,4-decadienal, and 2,3-dimethyl-5-ethylpyrazine-were found to significantly contribute to the aroma differences between Sichuan and non-Sichuan MT-Daqu.CONCLUSION: This study delineates the distinct Qu-aroma characteristics of MT-Daqu from various SAB production areas and identifies the aroma-active compounds responsible for these differences. The insights gained from this research offer valuable guidance for optimizing flavor profiles in MT-Daqu production, potentially enhancing the overall quality and regional distinctiveness of the product.

Preprint BRIEF REPORT | doi:10.20944/preprints202104.0658.v1

SCA Medium: A New Culture Medium for the Isolation of all Candida auris Clade

Ahmad Ibrahim, Lucie Peyclit, Rim Abdallah, Saber Khelaifia, Amanda Chamieh, Jean-Marc Rolain, Fadi Bittar

Subject: Biology And Life Sciences, Biochemistry And Molecular Biology Keywords: Candida; Candida auris; Culture; Emerging fungus; Isolation; Specific medium

Online: 26 April 2021 (11:06:41 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202406.0079.v1

Investigation of Toughening Mechanisms in Elastomeric PC Blends through Morphological and Mechanical Characterization at Small and Medium Strain Rates

Pedro Veiga Rodrigues, Bruno Ramoa, Maria Cidália R. Castro, Ana Vera Machado

Subject: Chemistry And Materials Science, Polymers And Plastics Keywords: polycarbonate elastomeric blends; toughening mechanism; small strain rate; medium strain rate

Online: 6 June 2024 (03:12:19 CEST)

Show abstract| Download PDF| Supplementary Files| Share

Preprint ARTICLE | doi:10.20944/preprints202409.0578.v1

Point of Common Connection Voltage Modulated Direct Power Control with Disturbance Observer to Increase of Renewable Energy Acceptance in Power System

Yong Woo Jeong, Woo Young Choi

Subject: Engineering, Electrical And Electronic Engineering Keywords: Grid voltage modulated power control; Point of common connection; Energy storage system; Voltage source inverter; Disturbance observer; Total harmonic distortion

Online: 9 September 2024 (08:00:22 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201609.0104.v1

Icing Forecasting of High Voltage Transmission Line Using Weighted Least Square Support Vector Machine with Fireworks Algorithm for Feature Selection

Tiannan Ma, Dongxiao Niu

Subject: Computer Science And Mathematics, Computer Science Keywords: icing forecasting; fireworks algorithm; least square support vector machine; feature selection

Online: 27 September 2016 (11:16:44 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202404.0181.v1

Signal-Injection-Based Topology Identification for Low-Voltage Distribution Networks Considering Missing Data

Yilong Duan, Zheng Liu, Yuanyuan Liu, Yong Li

Subject: Engineering, Electrical And Electronic Engineering Keywords: topology identification; low-voltage distribution network; signal injection

Online: 2 April 2024 (12:55:16 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202404.0226.v1

Design and Analysis of a Novel Non-isolated DC-DC Modular Multilevel Converter Architecture for High Voltage Direct Current Power Networks Interconnections

Abdurrahim Erat, Ahmet Mete Vural

Subject: Engineering, Electrical And Electronic Engineering Keywords: HVDC; DC-DC Power Conversion; MMC; DC-DC MMC; Asynchronous Power Grids

Online: 2 April 2024 (15:49:58 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201610.0081.v1

Development and Application of a Wireless Sensor for Space Charge Density Measurement in an Ultra-High-Voltage, Direct-Current Environment

Encheng Xin, Yong Ju, Haiwen Yuan

Subject: Engineering, Control And Systems Engineering Keywords: Ultra High-voltage direct-current (UHVDC); space charge density; energy consumption; wireless communication; Zigbee

Online: 20 October 2016 (06:02:00 CEST)

Show abstract| Download PDF| Share

Preprint COMMUNICATION | doi:10.20944/preprints202405.0234.v1

Microstructure and Elemental Composition of Coffea arabica L. Roasted Medium of Specialty and with “Pluma” Denomination of Origin

Jesica Jiménez, Luis Robledo, Ema Antonio, Alma Pérez, Marco Sánchez, Iván García

Subject: Biology And Life Sciences, Biology And Biotechnology Keywords: Coffea arabica L; microstructure; elemental composition; roasted medium; “ Pluma”

Online: 6 May 2024 (08:11:43 CEST)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints202310.1570.v1

Review and Analysis of Energy-Efficient AC Voltage Regulators

Aleksey Vjacheslavovich Udovichenko, Evgeniy Valer'evich Grishanov, Evgeniy Andreevich Kosykh, Ali Dzhavanshirovich Mekhtiyev

Subject: Engineering, Electrical And Electronic Engineering Keywords: AC voltage regulator; stabilizer; soft start of the motor; AC switch; transformer; energy efficiency

Online: 24 October 2023 (19:16:21 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201610.0029.v1

Entropy Generation Analysis at Mixed MHD Convection in a Square Lid-Driven Cavity Filled With Darcy–Brinkman- Forcheheimer Porous Medium

Rahma Bouabda, Mounir Bouabid, Mourad Magherbi

Subject: Engineering, Automotive Engineering Keywords: Mixed MHD convection; porous media; Lid-Driven Cavity; Entropy generation; numerical CVFEM method

Online: 10 October 2016 (09:56:36 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202306.1814.v1

Triplin: Mechanistic Basis for Voltage-Gating

Marco Colombini, Patrick Liu, Chase Dee

Subject: Biology And Life Sciences, Biophysics Keywords: voltage dependence; voltage sensor; porin; prokaryote; kinetics; polyarginine; cooperativity; pore

Online: 26 June 2023 (13:47:56 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201808.0288.v1

Voltage Control for DC-DC Converters

Usman Rahat, Abdul Basit, Muhammad Salman

Subject: Engineering, Electrical And Electronic Engineering Keywords: analog feedback, operational amplifier (Opamp), buck converter, continuous conduction mode.

Online: 16 August 2018 (14:10:02 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202304.0020.v1

Expert System Integrating Rule-Based Reasoning to Voltage Control in PV-Rich Low Voltage Electric Distribution Networks

Vasilica Dandea, Gheorghe Grigoras

Subject: Engineering, Energy And Fuel Technology Keywords: expert system; rule-based reasoning; voltage control; On-load Tap Changer; distribution networks; photovoltaic prosumers

Online: 3 April 2023 (09:33:08 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.0205.v1

IR4.0 Readiness Model for Small and Medium Enterprises (SMEs)

Nurul Izzati Saleh

Subject: Business, Economics And Management, Human Resources And Organizations Keywords: Digital Transformation; IR4.0; Self-Readiness; Diffusion of Innovation; SMEs

Online: 3 August 2024 (08:14:39 CEST)

Show abstract| Download PDF| Share

The Industrial Revolution 4.0 (IR4.0) is transforming the global economy, necessitating mall and medium-sized enterprises (SMEs) to adopt new technologies like artificial intelligence (AI), the Internet of Things (IoT), blockchain, and cloud computing. Therefore, SMEs need to assess their readiness to identify capabilities and areas for improvement to remain competitive. However, existing IR4.0 readiness assessment such as the Industry4WRD Readiness Assessment and Industry 4.0-Readiness by IMPULS German are time-consuming and restrict the participation of various sectors. Using the understanding of theories such as Technology Acceptance Model (TAM), Unified Theory of Acceptance and Use of Technology (UTAUT), Technology Readiness Index (TRI), and Diffusion Of Innovation (DOI), this study developed an initial research model that identifies the dimensions of IR4.0 readiness; (i) organization, (ii) data, (iii) infrastructure, (iv) analytics, and (v) IT, development and operations. This study carried out qualitative methods through four different phases. The first phase is a systematic literature review, and data collection through participant observation (PO) in IR4.0 skills training programs, seminars, and workshops. The second phase is the development of an initial research model to identify the dimensions of IR4.0 readiness that will be used in the next phase. The third phase is a survey on SME’s IR4.0 readiness via the IR4.0 e-Readiness Checker (IR4.0 eRC) readiness assessment system, which produces the final research model, IR4.0 SME Readiness Model. In the fourth phase, the IR4.0 Readiness Model is confirmed for use by SMEs in Malaysia through interviews with three industry experts in Malaysia. Based on the 50 responses in the IR4.0 eRC evaluation, the average IR4.0 readiness of SMEs is 66%, and only 10 SMEs with less than 50%, showing room and improvement opportunities for the continuous research and development of IR4.0 transformation. This study developed IR4.0 readiness model for SMEs to assess readiness for IR4.0 transformation, support investments in IoT projects and employee upskilling programs.

Preprint COMMUNICATION | doi:10.20944/preprints202306.1688.v1

Vortex Beam in Turbulent Kerr Medium

Andrey D. Bulygin, Yury E. Geints, Ilia Yu. Geints

Subject: Physical Sciences, Optics And Photonics Keywords: optical vortex; optical turbulence; self-focusing; ultrashort laser pulse

Online: 23 June 2023 (13:14:00 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201712.0071.v1

Models as a Medium in Architecture

Atli Magnus Seelow

Subject: Arts And Humanities, Art Keywords: history of architecture; architectural models; architectural media

Online: 12 December 2017 (07:05:09 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.2252.v1

Smallholder Market-Driven Cassava Production: Inefficiencies of Farmer-Led Small and Medium-Sized Enterprises in Lake Region, Kenya

Simon Wanjala Omondi, Paul Tana, Cosmas Lutomia

Subject: Social Sciences, Area Studies Keywords: Farmer-led SMEs; Market; Cassava value chain; entrepreneurial model; Lake Region Kenya

Online: 3 September 2024 (05:08:09 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.1858.v1

A Dynamic Simulation of a Piezoelectric Energy Harvesting System Integrated with a Closed-Loop Voltage Source Converter for Sustainable Power Generation

Ahmed K Ali, Ali Abdulwahhab Abdulrazzaq, Ali H. Mohsin

Subject: Engineering, Electrical And Electronic Engineering Keywords: controlled PWM rectifier; P&; O MPPT; closed-loop converter; piezoelectric energy harvesting; sustainable renewable energy

Online: 26 August 2024 (17:08:55 CEST)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints202309.1389.v1

Microgrids Overview and Performance Evaluation on Low-voltage Distribution Network

Ereola Johnson Aladesanmi, Kingsley Ogudo

Subject: Engineering, Electrical And Electronic Engineering Keywords: Keywords: Microgrid; small hydropower plant; wind farm; battery energy storage systems; grid-connected; stand-alone mode; power quality

Online: 20 September 2023 (13:59:40 CEST)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints201906.0192.v1

Genetic Associations between Voltage-Gated Calcium Channels and Psychiatric Disorders

Arturo Andrade, Ashton Brennecke, Shayna Mallat, Julian Brown, Juan Gomez-Rivadeneira, Natalie Czepiel, Laura Londrigan

Subject: Medicine And Pharmacology, Psychiatry And Mental Health Keywords: voltage-gated calcium channels; major depressive disorder; autism spectrum disorder; schizophrenia; bipolar disorder; attention-deficit and hyperactivity disorder; anxiety; calcium channel modulators; psychiatric disorders; auxiliary subunits; genetic risk variations

Online: 20 June 2019 (04:16:52 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202409.1855.v1

Antimicrobial Susceptibility of Uropathogenic Escherichia coli with Analysis of Impact of Socio-Economic Factors in Low, Medium and High-Income Countries

Meher Rizvi, Maria Khan, Amina AL Jardani, Ujjala Ghoshal, Zaaima AL Jabri, Mohammad Ahanjan, Azza AL Mamari, Nawal AL Shizawi, Hiba Sami, Abdullah Balkhair, Adila Shaukat, Alwarith Nasser Salem Alkharusi, Abdulrahman Almahrouqi, Afreenish Hassan, Ajay Kumar, Amal Malehi, Amina Gul, Ashima Singh, Asma Said Hamed AL Shidhani, Areena Hoda Siddiqui, Aruna Poojary, Azza AL Rashdi, Bradley Langford, Dmytro Stepanskyi, Abbas Dolatabadi, Aisha Al Mufraji AL Mufraji, Elham Said Ahmed AL Risi, Garima Kapoor, Isabella Princess, Hatim Ali Eltahir, Hilal Al Sidairi, Kaitlyn Dougherty, Katia Iskandar, Ken Masters, Ibrahim Khalaf Hamdan AL Busaidi, Laila AL Yazidi, Mahfuza Nasrin, Mahmood Salim AL Subhi, Mallika Sengupta Mallika Sengupta, Manisha Khandait, Nada Khalfan AL Tamtami, Nada Khafan Alsiyabi, Nawal AL Kindi, Nazla Musthafa Luthfee, Neha Shreshtha, Nihal Mohamed Amur AL Riyami, Noora Hilal Ali AL Busaidi, Nupur Goel, Oksana Ishchenko, Omnia Mohamed Elnabawy Ahmed Taher, Pragnya Paramita Jena, Rajni Ekadashi, Razan Zadjali, Reba Kanungo, Sara Abolghasemi, Salima Al-maqbali, Sanjay Jaju, Sayantan Banerjee, Shadma Yaqoob, Shahnaz Sali, Shafqat Husnain Khan, Shalini Malhotra, Stephen Hughes, Sundas Shaukat, Syed Mohammed Atif, Vrushali Vishwas Patwardhan, Victorien Dougnon, Wahid Khan, Walid Wali, Zakariya AL Muharrmi, Zeeshana Basit, Jasashree Choudhury, Rachita Pravalina, Sanjeev Singh, Sarman Singh, Neelam Taneja, Raman Sardana, Pawan Kapoor, Rajeev Soman, Rashid Al Abri

Subject: Medicine And Pharmacology, Epidemiology And Infectious Diseases Keywords: community acquired UTI; Escherichia coli; antimicrobial susceptibility; Indian subcontinent; MENA; GDP; temperature

Online: 24 September 2024 (12:32:05 CEST)

Show abstract| Download PDF| Supplementary Files| Share

Preprint REVIEW | doi:10.20944/preprints202409.0642.v1

Conformational Mobility of Voltage-Gated Ion Channels

Ekaterina Kravchuk, Elizaveta Trifonova, Olga S. Sokolova

Subject: Biology And Life Sciences, Biophysics Keywords: voltage-gated ion channels; conformation; membrane mimetics; cryoelectron microscopy; in situ analysis; coordinated motion

Online: 9 September 2024 (09:20:55 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201902.0174.v1

Effects of Voltage Dips on Robotic Grasping

Giuseppe Carbone, Marco Ceccarelli, Christopher Fabrizi, Pietro Varilone, Paola Verde

Subject: Engineering, Electrical And Electronic Engineering Keywords: Robotic Hands, Grasping, Electric Power Quality, Voltage Dips effects

Online: 19 February 2019 (10:48:50 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201809.0062.v1

Nernst Voltage Loss in Oxyhydrogen Fuel Cells

Jinzhe Lyu

Subject: Chemistry And Materials Science, Electrochemistry Keywords: Nernst voltage; activation overvoltage; concentration loss; equilibrium potential; exchange current density; net current density

Online: 4 September 2018 (11:56:23 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202309.1191.v1

Short- and Medium-Term Electricity Consumption Forecasting Using Prophet and GRU

Namrye Son, Yoonjeong Shin

Subject: Computer Science And Mathematics, Computer Science Keywords: prophet; LSTM; GRU; meteorological data; electricity consumption forecasting

Online: 19 September 2023 (08:33:08 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202404.1187.v2

Effect of Cetyl Pyridinium Chloride on Corrosion Inhibition Properties of Mild Steel in Acidic Medium

Chandradip Kumar Yadav, Shova Neupane, Benadict Rakesh, Amar Prasad Yadav, Tulasi Prasad Niraula, Ajaya Bhattarai

Subject: Chemistry And Materials Science, Materials Science And Technology Keywords: FTIR; FESEM; EDX; inhibitor; mild steel; cetyl pyridinium chloride

Online: 30 April 2024 (15:11:06 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202308.2183.v1

Medium Rock-Soil Temperature Distribution Characteristics in Different Time Scales and New-Type Well Layout Form in Application of Medium-Deep Borehole Heat Exchanger

Jun Liu, Yuping Zhang, Zeyuan Wang, Cong Zhou, Boyang Liu, Fenghao Wang

Subject: Engineering, Energy And Fuel Technology Keywords: Medium-deep; Heat transfer; Geothermal heating; Thermal interference; Life cycle

Online: 31 August 2023 (14:55:43 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202006.0241.v1

Design and Simulation of Voltage Amplidyne System using Robust Control Technique

Mustefa Jibril, Messay Tadese, Eliyas Alemayehu

Subject: Engineering, Control And Systems Engineering Keywords: Amplidyne; H ∞ optimal control synthesis controller; H ∞ optimal control synthesis via ∞-iteration controller

Online: 19 June 2020 (11:40:15 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202208.0300.v1

The Export of Medium and High-Tech Products Manufactured in Europe

Angelo Leogrande, Alberto Costantiello, Lucio Laureti

Subject: Business, Economics And Management, Economics Keywords: Innovation; and Invention; Processes and Incentives; Management of Technological Innovation and R&D; Diffusion Processes; Open Innovation

Online: 17 August 2022 (04:33:29 CEST)

Show abstract| Download PDF| Share

Preprint COMMUNICATION | doi:10.20944/preprints202201.0246.v1

High precision voltage measurement for optical quantum computation

Kamil Wereszczyński, Agnieszka Michalczuk, Marcin Paszkuta, Jacek Gumiela

Subject: Computer Science And Mathematics, Computer Science Keywords: quantum computing; quantum optics; quantum optimization; photon entanglement; coincidence measure; photodiodes current measure; voltage measurement

Online: 17 January 2022 (17:27:41 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201802.0189.v1

Multifunctional Dynamic Voltage Restorer for Power Quality Improvement

Dung Vo Tien, Radomir Gono, Zbigniew Leonowicz

Subject: Engineering, Electrical And Electronic Engineering Keywords: compensation techniques; dynamic voltage restore; harmonic distortion; power quality; short circuit; voltage sag; voltage swell

Online: 28 February 2018 (05:35:56 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201805.0284.v1

Elimination of Common-mode Voltage in Dual Two-level Voltage Source Inverter Fed Open-end Load using a Discontinuous SVM Technique

Nuttawout Buarat, Yuttana Kumsuwan

Subject: Engineering, Electrical And Electronic Engineering Keywords: dual two-level voltage source inverter; common-mode voltage; discontinuous space vector modulation schemes; centralizing pulse width modulation; open-end load

Online: 22 May 2018 (05:11:06 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202308.2028.v1

Medium Energy Proton Detector Onboard FY-4B Satellite

HuanXin Zhang, GuoHong Shen, ShenYi Zhang, WeiGuo Zong, JianGuang Guo, AnQin Chen, Xin Zhang, Bo Su, Ping Zhou, WenTao Ji

Subject: Engineering, Aerospace Engineering Keywords: medium energy proton; space environment; light pollution; magnetic deflection; Geant4

Online: 30 August 2023 (14:07:47 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202311.0077.v1

Network Reconfiguration for Loss Reduction using Tabu Search and a Voltage Drop

Dionicio Zocimo Ñaupari Huatuco, Luiz Filho, Franklin Simeon Pucuhuayla, Yuri Percy M. Rodriguez

Subject: Engineering, Electrical And Electronic Engineering Keywords: network reconfiguration; distribution system; optimization; Tabu Search; minimization; distribution system loss; OpenDSS; Python

Online: 2 November 2023 (07:01:03 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.1691.v1

Protecting Small and Medium Enterprises: A Specialized Cybersecurity Risk Assessment Framework and Tool

Mohammed El-Hajj, Zuhayr Aamir Mirza

Subject: Computer Science And Mathematics, Information Systems Keywords: SMEs; Risk Assessment; Cybersecurity Framework; NIST; ISO; Risk Mitigation

Online: 23 August 2024 (07:15:44 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202205.0240.v1

Export Decision and Formal Credit Constraints - Evidence in Vietnamese Small and Medium Enterprises

Trang Phan

Subject: Business, Economics And Management, Economics Keywords: Credit constraints; Export; SMEs; Instrumental variable; Probit regression; Vietnam

Online: 18 May 2022 (10:35:32 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.1085.v1

Calibration for Improving the Medium‐Range Soil Forecast over Central Tibet: Effects of Objective Metrics’ Diversity

Yakai Guo, Baojun Yuan, Changliang Shao, Guanjun Niu, Dongmei Xu, Yong Gao

Subject: Engineering, Other Keywords: metrics diversity; Kling-Gupta efficiency; soil temperature modelling; spatial complexity; land surface parameters

Online: 14 August 2024 (14:53:42 CEST)

Show abstract| Download PDF| Supplementary Files| Share

Preprint ARTICLE | doi:10.20944/preprints202207.0288.v1

Design, Construction and Characterization of Sealed Tube Medium Power CO₂ Laser System

Muddasir Naeem, Tayyab Imran, Mukhtar Hussain, Arshad Saleem Bhatti

Subject: Physical Sciences, Applied Physics Keywords: ZEMAX; Thermoelectric coolers; Flyback transformer; High tension pump source; Penetration depth

Online: 19 July 2022 (13:28:19 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202205.0382.v1

Aerodynamic Shape and Drag Scaling Laws of Flexible Fibre in Flowing Medium

Bohua Sun, Xiao-Lin Guo

Subject: Physical Sciences, Applied Physics Keywords: flexible fibre; flow medium; aerodynamic shape; drag; scaling laws

Online: 27 May 2022 (10:46:59 CEST)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints201910.0337.v1

Low and Medium Carbon Advanced High-Strength Forging Steels for Automotive Applications

Koh-ichi Sugimoto, Tomohiko Hojo, Ashok Kumar Srivastava

Subject: Chemistry And Materials Science, Metals, Alloys And Metallurgy Keywords: advanced high-strength forging steel; hot-forging; microstructure; retained austenite characteristics; mechanical properties; applications

Online: 29 October 2019 (10:59:30 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201803.0225.v1

Selective Colorimetric Sensors for Cyanide and Acetate Ion in Partially Aqueous Medium

Divya Singhal, Neha Gupta, Ashok Kumar Singh

Subject: Chemistry And Materials Science, Analytical Chemistry Keywords: chemosensors; CN− selective sensor; test strip sensor

Online: 27 March 2018 (12:13:34 CEST)

Show abstract| Download PDF| Supplementary Files| Share

Preprint ARTICLE | doi:10.20944/preprints202407.0256.v1

A Constant Voltage WPT System for Implantable Neural Stimulators

Zhiyang Cao, Shicong Gui, Chujia Xu, Rui Zhong, Zhaotan Lin, Yubo Li

Subject: Engineering, Electrical And Electronic Engineering Keywords: WPT; resonance inductive coupling; wireless neural stimulator; implant device

Online: 2 July 2024 (15:13:59 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202312.2343.v1

A Sub-1-V Nanopower MOS-Only Voltage Reference

Siqi Wang, Zhenghao Lu, Kunpeng Xu, Hongguang Dai, Zhanxia Wu, Xiaopeng Yu

Subject: Engineering, Electrical And Electronic Engineering Keywords: voltage reference; MOS-only; low power; low voltage; sub-threshold

Online: 30 December 2023 (16:23:09 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202302.0495.v1

Increasing the Voltage – Sequencing Decarbonisation With Green Power & Efficiency

Stefan M. Buettner, Josefine Döpp, Liane Strauch, Marina Gilles, Werner König, Anna-Lena Klingler

Subject: Business, Economics And Management, Economics Keywords: decarbonisation; energy supply security; energy demand; energy systems; industry; capacity planning

Online: 28 February 2023 (02:53:02 CET)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints202301.0125.v1

Voltage Lifting Techniques for Non-isolated DC/DC Converters

Abdulaziz Alkhaldi, Ahmad Elkhateb, David Laverty

Subject: Engineering, Electrical And Electronic Engineering Keywords: High voltage gain; DC/DC converter; Step-up techniques; Renewable energy

Online: 6 January 2023 (10:04:32 CET)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201809.0051.v2

Unbalanced Current Sharing Control in Islanded Low Voltage Microgrids

foad najafi, Matthias Fripp

Subject: Engineering, Electrical And Electronic Engineering Keywords: distributed generation; LV microgrid; negative-sequence current; zero-sequence current; power sharing; unbalance load; voltage control

Online: 5 September 2018 (05:55:55 CEST)

Show abstract| Download PDF| Share

This paper reports a new control strategy to improve sharing of unbalanced currents in islanded LV microgrids. This technique provides fast and effective sharing of positive-, negative- and zero-sequence currents, and is the first example of zero-sequence current sharing in the literature. The controllers are designed in the stationary frame. The control structure consists of four loops; 1)~the current controller; 2)~the voltage controller; 3)~the droop controller and the 4)~negative and zero sequence current controllers. The output current is considered unknown for the controller and is added to the control system as a disturbance. The proposed controller features a high gain in fundamental and harmonic frequencies, hence a good voltage quality is obtained in the presence of unbalanced and nonlinear loads. To this aim, a proportional-resonant (PR) controller is adopted as the current controller. By using a multi-resonant controller as current controller, a unified control structure is obtained which is suitable for both grid-connected and islanded modes. The voltage controller is designed using a resonant controller so that the voltage can have low VUF and THD in the presence of unbalanced and nonlinear loads. Furthermore, in this paper droop method is applied to the control structure to share real and reactive powers. Simulation studies show that the conventional droop method cannot share the oscillatory part of the output power that is due to the presence of unbalanced loads in the microgrid. This paper relies on using zero and negative sequence virtual impedance controller to share the oscillatory part of output power. By using zero-sequence virtual impedance controller (ZSVIC) and negative-sequence virtual impedance controller (NSVIC), the zero and negative sequence currents in the microgrid are controlled and shared effectively. By compensating zero- and negative-sequence currents locally, the flow of these currents in the microgrid is minimized, and the overall power quality of the islanded LV microgrid is improved.

Preprint ARTICLE | doi:10.20944/preprints202404.0517.v1

Analysis of Immediate Effects of the COVID-19 Pandemic on Small and Medium-Sized Enterprises (SMEs) in Rwanda: Firm-Level Data Analysis

Emmanuel Munyemana, Joseph K. Mung’atu, Charles Ruranga

Subject: Business, Economics And Management, Econometrics And Statistics Keywords: wood; firm; COVID-19 and SMEs; regression models

Online: 8 April 2024 (08:46:54 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202407.1654.v1

Evaluation of Medium-Deep Geothermal Resources Based on Seismic Imaging Technology: A Case Study of the Midu Basin in Yunnan Province

Jie Li, Xuebin Zhang, Chao Xu, Chuan Li, Hui Tan, Ziye Yu, Yunpeng Zhang

Subject: Environmental And Earth Sciences, Geophysics And Geology Keywords: geothermal resources; seismic tomography imaging; velocity ratio; Midu basin; genesis mechanism

Online: 22 July 2024 (09:11:19 CEST)

Show abstract| Download PDF| Share

Preprint COMMUNICATION | doi:10.20944/preprints202107.0601.v1

MalaSelect: a Selective Culture Medium for Malassezia Species Isolation

Abdourahim Abdillah, Stéphane Ranque

Subject: Biology And Life Sciences, Biochemistry And Molecular Biology Keywords: Malassezia; selective culture medium; Rapamycin; isolation; polymicrobial samples.

Online: 27 July 2021 (11:29:17 CEST)

Show abstract| Download PDF| Share

Working Paper ARTICLE

Possible Lattice-Like Medium for Electron Pairing in La₂CuO₄

Tiege Zhou

Subject: Physical Sciences, Condensed Matter Physics Keywords: high temperature copper-oxide superconductors; time-dependent density functional theory; electron-pairing medium

Online: 10 July 2019 (10:29:23 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints201906.0184.v1

Distillery Wastewater as a Sustainable Medium for Microalgae Production

Viviana Quintero-Dallos, Janet Bibiana García-Martínez, Jefferson Eduardo Contreras-Ropero, Crisostomo Barajas-Ferrerira, Andrés Fernando Barajas-Solano, Roberto Lavecchia, Antonio Zuorro

Subject: Engineering, Bioengineering Keywords: distillery wastewater; vinasse; heterotrophic cultures; biorefinery; Chlorella vulgaris

Online: 19 June 2019 (12:32:03 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202309.1904.v1

Managing the Power Supply Energy Efficiency by Means of Higher Voltage and Interharmonics

Gennadiy Pivnyak, Oleksandr Azukovskiy, Yurii Papaika, Edgar Caseres Cabana, Bogdan Miedziński, Bartosz Polnik, Andrzej Jamróż, Alla Polyanska

Subject: Environmental And Earth Sciences, Environmental Science Keywords: energy efficiency; managing power supply systems; electromagnetic compatibility (EMC); reliability; frequency converters; higher harmonics; interharmonics; resonance phenomena

Online: 28 September 2023 (04:07:31 CEST)

Show abstract| Download PDF| Share

Preprint REVIEW | doi:10.20944/preprints202104.0717.v1

Coupled Inductor and Voltage Doubler Circuit for High Step-Up DC-DC Converter

Abhinav Vinod Deshpande

Subject: Engineering, Electrical And Electronic Engineering Keywords: Step Up Voltage Gain, Coupled Inductor, Voltage Doubler

Online: 27 April 2021 (12:41:05 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202010.0471.v1

Impact of Battery Energy Storage System and its Converter Characteristics on Voltage Sags

Nhlanhla Mbuli, Sebu Lichaba, Ronald Xezile, Jan-Harm Pretorius

Subject: Engineering, Automotive Engineering Keywords: Battery energy storage system (BESS); method of fault positions; renewable energy; transient stability; voltage sags

Online: 23 October 2020 (08:49:46 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202406.1959.v1

FireSonic: Design and Implementation of an Ultrasound Sensing-Based Fire Type Identification System

Zheng Wang, Yanwen Wang, Mingyuan Liao, Yi Sun, Shuke Wang, Xiaoqi Sun, Xiaokang Shi, Yisen Kang, Mi Tian, Tong Bao, Ruiqi Lu

Subject: Computer Science And Mathematics, Signal Processing Keywords: Acoustic sensing; channel measurements; fire type classification; beamforming

Online: 27 June 2024 (18:39:27 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202306.0422.v1

Digital Transformation Trends in Small, Medium and Large Enterprises in Austria and in Hungary

Andrea Katona, Zoltán Birkner, Erzsébet Péter

Subject: Business, Economics And Management, Other Keywords: Industry 4.0; corporate strategy; Industry 4.0 readiness; digital technology; industrial digitalisation

Online: 6 June 2023 (08:56:14 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202408.1863.v1

Exploring the Economic Resilience of Small and Medium Enterprises (SMEs) During Financial Crises

Harry Johnson, Olivia Roberts, George Wilson

Subject: Business, Economics And Management, Business And Management Keywords: Economic resilience; small and medium enterprises; financial management; innovation; leadership; government support; social capital

Online: 26 August 2024 (15:33:41 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202307.0318.v1

Material Point Simulation Method for Concrete Medium Fracture and Fragmentation under Blast Loading

Zheng Liu, Jun Liu, Xianqi Xie, Mengyang Zhen, Yue Wang, Chen Ou, Haowen Zheng

Subject: Engineering, Civil Engineering Keywords: blast loading; concrete medium; rate sensitivity; improved HJC concrete model; material point method

Online: 5 July 2023 (12:37:18 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202101.0434.v1

Formation of Nickel(II)Porphyrin and Its Interaction with DNA in Aqueous Medium

Ahsan Habib, Salma Serniabad, Mohammad Shamim Khan, Rokayea Islam, Mrittika Chakraborty, Aklima Nargis, Md Emran Quayum, Md Ashraful Alam, Valentina Rapozzi, Masaaki Tabata

Subject: Chemistry And Materials Science, Analytical Chemistry Keywords: Speciation of Ni2+; Kinetics and mechanism; Hydrogen bonding; 5,10,15,20-tetrakis(N-methylpyridium-4-yl)porphyrinatonickel(II) tetracation; Outside binding; Chemotherapeutic agents

Online: 22 January 2021 (08:42:47 CET)

Show abstract| Download PDF| Supplementary Files| Share

In this work, kinetics of the reaction between 5,10,15,20-tetrakis(N-methylpyridium-4-yl)porphyrin and Ni2+ species were investigated in aqueous solution at 25 ±1 ºC in I = 0.10 M (NaNO3). Speciation of Ni2+ was carried out in I = 0.10 M (NaNO3) in order to provide the distribution of the Ni2+ species with different solution pH. The experimental data have been compared with the speciation diagram constructed from the values of hydrolysis constants of Ni2+ ion. Speciation data showed that the hexaaquanickel(II), [Ni(H2O)6]2+, ions take place in hydrolysis reactions through formation of [Ni(OH2)6-n(OH)n]2-n species with solution pH. Based on the speciation of Ni2+ and pH dependent rate constants, rate expression can be written as: d[Ni(TMPyP)4+]/dt = (k1[Ni2+(aq)] + k2[Ni(OH)+(aq)] + k3[Ni(OH)2o(aq)] + k4[Ni(OH)3-(aq)])[H2TMPyP4+], where k1, k2, k3 and k4 were found to be k1 = (0.62 ± 0.22) × 10-2; k2 = (3.60 ± 0.40) × 10-2; k3 = (2.09 ± 0.52) × 10-2, k4 = (0.53 ± 0.04) × 10-2 M-1s-1 at 25 ±1 °C, respectively. Kinetic results showed that monohydroxo, [Ni(H2O)5(OH)]+, is the most reactive among the [Ni(OH2)6-n(OH)n]2-n species. The enhanced reactivity has been ascribed to the formation of hydrogen bonding between oxygen atom of hydroxyl group of the [Ni(H2O)5(OH)]+ species and the pyrrolic hydrogen atom of the [H2TMPyP]4+. The rate of formation of [Ni(II)TMPyP]4+ complex was to be 3.99 × 10-2 M-1s-1 in I = 0.10 M, NaNO3 (25 ± 1 ºC). Ionic strength effect on the reaction rate is suggested that the net charge of the tetracationic porphyrin is to be +3.6 on the basis of Brønsted-Bjerrum equation. The UV-Vis and fluorescence data revealed that [Ni(II)TMPyP]4+ and H2(TMPyP)4+ interact with DNA, and UV-Vis results suggest that Ni(II)-porphyrin and free base porphyrin interact with DNA via outside binding with self-stacking and intercalation, respectively. Mechanism of kinetics of formation of the [Ni(II)TMPyP]4+ complex in aqueous medium is discussed. An investigation of application of the [Ni(II)TMPyP]4+ complex along with other metalloporphyrins such as Zn2+-, Ru2+-, Pt2+-, [Au(III)TMPyP]5+ as anti-COVID-19 agents is now in progress under international collaboration.

Preprint ARTICLE | doi:10.20944/preprints201810.0576.v1

Financing MSMEs (Micro Small and Medium Enterprises) in Nigeria: Implications of Transaction Costs

Oluseye Ajuwon, Sylvanus Ikhide, Joseph Akotey

Subject: Business, Economics And Management, Finance Keywords: Micro Small and Medium Enterprises, Transaction costs, Small businesses, Credit accessibility

Online: 24 October 2018 (12:05:42 CEST)

Show abstract| Download PDF| Share

Preprint ESSAY | doi:10.20944/preprints202307.0267.v1

The Emerging Role of Voltage-Gated Ion Channels in Cancer

Minas Sakellakis, Athanasios Chalkias

Subject: Medicine And Pharmacology, Oncology And Oncogenics Keywords: Ion; channels; regeneration; cancer; treatment; translational research; experimental research

Online: 5 July 2023 (14:38:37 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202107.0458.v1

Multi-channel Precision Voltage Source for Experiments on Quantum Dots

Yumei Tang, Kefu Liu

Subject: Physical Sciences, Quantum Science And Technology Keywords: quantum dots; bias source; Multi-channel, high precision

Online: 20 July 2021 (15:29:52 CEST)

Show abstract| Download PDF| Share

Preprint ARTICLE | doi:10.20944/preprints202101.0401.v1

Analysis of Transient Voltage Problem Caused by Electric Arc Furnace

Liu Yang, Qinyue Tan, Di Xiong

Subject: Engineering, Automotive Engineering Keywords: Electric arc furnace; Arc short circuit; transient power quality; transient voltage; voltage sag

Online: 20 January 2021 (14:24:47 CET)

Show abstract| Download PDF| Share

Search Results

38468 articles found