Journal of Progress in Engineering and Physical Science最新文献

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Evaluation and Analysis of Harmonic Distortion on 330kV Network Case Study Selected Sub-Region Nigerian Power System for Improve Power Quality 330kV电网谐波畸变评价与分析——以尼日利亚电力系统改善电能质量为例
Journal of Progress in Engineering and Physical Science Pub Date : 2022-11-01 DOI: 10.56397/jpeps.2022.11.03
S. L. Braide
{"title":"Evaluation and Analysis of Harmonic Distortion on 330kV Network Case Study Selected Sub-Region Nigerian Power System for Improve Power Quality","authors":"S. L. Braide","doi":"10.56397/jpeps.2022.11.03","DOIUrl":"https://doi.org/10.56397/jpeps.2022.11.03","url":null,"abstract":"This paper presented fundamental characteristics of harmonic studies and its related work. The total harmonic distortion (THD) of the transmission line were computed using harmonics contents parameters of the waveform (harmonic voltage and impedance magnitude values). Results of THD for the 330kV transmission line are presented using harmonic load flow analysis in ETAP—domain on the view to measure the level of distortion in the network. Figure 2 shows the section of the harmonic load flow simulation in order to check for degree of harmonic distortion in the system under investigation. The provision of the harmonic frequency with greater magnitude exceeding THD and IHD limits are violated in accordance to IEC 61000-3-6:2008 (European Standards) are used as benchmark for measurement. That is the distortion for current and voltage (THDi% and THD%) are 0.5 and 1.5 respectively particularly harmonic order (h) ≤ 13. Consequently, the harmonic frequency violations with greater magnitude of 5th, 7th, 11th, and 13th order in the network are mitigated with 3-unit of single tuned filter to the affected buses for improved power quality.","PeriodicalId":110964,"journal":{"name":"Journal of Progress in Engineering and Physical Science","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127872304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Organophosphorus Residues in Fish in Rural Areas 农村鱼类的有机磷残留量
Journal of Progress in Engineering and Physical Science Pub Date : 2022-11-01 DOI: 10.56397/jpeps.2022.11.05
S. Saad, F. Shaltout, Amal A. A. Farag, Hashim F Mohammed
{"title":"Organophosphorus Residues in Fish in Rural Areas","authors":"S. Saad, F. Shaltout, Amal A. A. Farag, Hashim F Mohammed","doi":"10.56397/jpeps.2022.11.05","DOIUrl":"https://doi.org/10.56397/jpeps.2022.11.05","url":null,"abstract":"A total 45 fish samples (Tilapia, Claris) were collected from EL-Bagoria, EL-Menofi drainage and Bahr Shibin for detection and determination of organophosphorus pesticides (diazinon, Malathion and chlorpyrifos). Organophosphorus pesticides could not be detected in Bahr Shibin. No diazinon in Tilapia from EL-Bagoria but mean value of of Malathion 5.50±2.0, chlorpyrifos 5.0±1.66 but from EL-Menofi drainage mean level of diazinon 3.33±0.65, Malathion 4.98±1.22 and chlorpyrifos3.0±0.71 but in Claris samples, there were no diazinon, no Malathion, no chlorpyrifos from EL-Bagoria canal but from EL-Menofi drainage, mean value of diazinon 6.8±1.42, Malathion 4.64±0.81 and chlorpyrifos4.0±0.96. Pesticides are one the main contaminant of water sources which are considered the natural environment of fish. on the other hand, fish could be contaminated by pesticides either directly by gills breathing or indirectly through contamination of feeding items, so it is very important to analyze fish samples to detect to what extent the rate of accumulation of pesticides residues in fish flesh and organs.","PeriodicalId":110964,"journal":{"name":"Journal of Progress in Engineering and Physical Science","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133930176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Relativistic Dynamics and Electrodynamics in Uniformly Accelerated and in Uniformly Rotating Frames—the Proper Time Expressions 匀加速和匀旋转坐标系下的相对论动力学和电动力学——固有时表达式
Journal of Progress in Engineering and Physical Science Pub Date : 2022-11-01 DOI: 10.56397/jpeps.2022.11.02
A. Sfarti
{"title":"Relativistic Dynamics and Electrodynamics in Uniformly Accelerated and in Uniformly Rotating Frames—the Proper Time Expressions","authors":"A. Sfarti","doi":"10.56397/jpeps.2022.11.02","DOIUrl":"https://doi.org/10.56397/jpeps.2022.11.02","url":null,"abstract":"In the current paper we present a generalization of the transforms from the frame co-moving with an accelerated particle, for either rectilinear or circular motion, into an inertial frame of reference. The solution is of great interest for real time applications, because earth-bound laboratories are inertial only in approximation. The motivation is that the real-life applications include accelerating and rotating frames with arbitrary orientation more often than the idealized case of inertial frames; our daily experiments happen in the laboratories attached to the rotating Earth. Our paper is divided into two main sections, the first section deals with dynamics, i.e., forces, the second section deals with electromagnetism, i.e., Lorentz force and electromagnetic potentials, both expressed in terms of proper time.","PeriodicalId":110964,"journal":{"name":"Journal of Progress in Engineering and Physical Science","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128447285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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