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682 articles for “Frequency”
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Research ArticleOpen accessEvery word in the titleOptimal Decentralized Load Frequency Control Using HPSO Algorithms in Deregulated Power SystemsSeyed Abbas Taher, Reza Hematti, Ali Abdolalipour, Seyed Hadi TabeiLoad Frequency Control (LFC) is one the most important issues in electrical power system design/operation and is becoming much more significant recently with increasing size, changing structure and complexity in interconnected power systems. In practice LFC systems use simple Proportional-Integral (PI) or Integral (I) controllers. However, since the PI or I control parameters are usually tuned based on classical or … …American Journal of Applied Sciences, Vol. 5, Issue 9 · 30 Sep 2008 · 7,389 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleRobust Decentralized Load Frequency Control Using Multi Variable QFT Method in Deregulated Power SystemsSeyed Abbas Taher, Reza HemattiThe Load Frequency Control problem has been a major subject in electrical power system design/operation and is becoming more significant recently with increasing size, changing structure and complexity in interconnected power systems. In practice LFC systems use simple proportional-integral controllers. However, since the PI control parameters are usually tuned based on classical or trial-and-error approaches, they are incapable of obtaining … …American Journal of Applied Sciences, Vol. 5, Issue 7 · 31 Jul 2008 · 7,088 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAutomatic Calibration of Frequency Compensation System in Computer-Controlled Patch-Clamp AmplifierJun Xiong, Gang Hu, Anlian QuComputer-controlled patch-clamp amplifier is a digitally controlled analog device used to record the cellular ion channel currents in electrophysiology research. The inherent bandwidth and performance of the headstage is limited by the stray capacitance and distributed capacitance across the feedback resistors. In order to effectively improve the performance of the headstage, the paper advanced a simplified automatic calibration method of … …Journal of Computer Science, Vol. 3, Issue 10 · 31 Oct 2007 · 6,814 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleDesign of a Symmetrical Microstrip Bandpass Filter for S-Band Frequency RangeMohd Fadzil Ain, Mandeep Singh Jit Singh, Prabhu, Syed Idris Syed HassanA new type of microstrip bandpass filter is presented with a center frequency operation at 2.5GHz which lies in the S-band frequency range. The filter is designed to be much smaller compared to the same type of parallel-coupled bandpass filter. The simulation results are excellent and the filter is suitable for integration within various microwave subsystems. …American Journal of Applied Sciences, Vol. 4, Issue 7 · 31 Jul 2007 · 6,984 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleRainfall Depth-Duration-Frequency Relationships for South Carolina, North Carolina, and GeorgiaJ. P. Raiford, N.M. Aziz, A.A. Khan, D.N. PowellThe depth-duration-frequency curves and isopluvial maps for the region encompassing South Carolina, North Carolina, and Georgia were developed using the available rainfall data. The aim was to update the existing intensity-duration-frequency curves in the region and obtain these curves at ungauged sites throughout the region using the newly developed rainfall frequency analysis techniques. A total of 17 durations ranging from … …American Journal of Environmental Sciences, Vol. 3, Issue 2 · 30 Jun 2007 · 7,323 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAnalyzing the Groundwater Quality Parameters Using Frequency AnalysisMaryam Ghashghaie, Kaveh Ostad-Ali-Askari, Saeid Eslamian, Vijay P. SinghWater quality problems are world spread as a result of land use changes and industrial development. Water deficit problems become more severe in result of water quality ignorance. Determining the probability values of water quality parameters for specific return periods could be very helpful in water resources management and conservation in terms of quality. In this research some water quality … …American Journal of Engineering and Applied Sciences, Vol. 11, Issue 2 · 14 Apr 2018 · 9,083 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleStatistical Demonstration of Superiority of High-Frequency Short-Tests in Assessment When Teaching Statistics to Enhance Higher Student Pass RatesSolly Matshonisa Seeletse, Tshepo Matsose, Gezani Richman Miyambu, Eunice Lebogang SesaleWhen facilitating learning, quick and small assessments can assist to detect areas that require further reinforcement and also identify students who need extra help in understanding the concepts taught. This paper demonstrates with Statistics, a difficult subject to pass at Higher Education Institution (HEI) level, that when these tests are administered at high frequencies and in large numbers, students are … …American Journal of Applied Sciences, Vol. 14, Issue 9 · 5 Oct 2017 · 7,155 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleDesign of CHWHG Type Low Frequency Magnetic Fields GeneratorBo Cheng, Ahmed N. Abdalla, Xi Huang et al.Highly considering the invariability of magnetic field strength in the Magnetic Field Generators, which used to stimulate rat's nerve cell, surely improve the stimulation performance outcome. A new technique to get an invariable magnetic field strength within Magnetic Field Generator has been proposed, Furthermore it had implemented on microcontroller-based system providing an Alternating Magnetic Field Generator (AMFG) with a high … …Journal of Computer Science, Vol. 3, Issue 2 · 28 Feb 2007 · 6,965 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEffects of Electromagnetic Field Frequency on the Behavior and Mortalities of Living OrganismsTatyana Degtyarevskaya, Andrei VokhmintsevThe objective of this investigation is to assess the influence of electromagnetic fields on living organisms. The impact of electromagnetic radiation of varying intensities on alterations in behavioral responses and mortality rates of living organisms was examined under controlled laboratory conditions at the first Moscow state medical university, named after I.M. Sechenov. The subjects of the study encompassed 10 specimens … …OnLine Journal of Biological Sciences, Vol. 24, Issue 2 · 19 Jan 2024 · 5,296 accessesView PDFCite
Research ArticleOpen accessEvery word in the titlePerception, Frequency and Preference in Livestock-Origin Food Consumption During the COVID-19 Pandemic in IndonesiaEndang Sulastri, Annisa’ Qurrotun A’yunCoronavirus disease 2019 (COVID-19) is a contagious respiratory that produces mild gastrointestinal illness. The infection rate of COVID-19 increases in individuals with low immunity. In an effort to prevent this disease transmission, the Government advocates increasing the immunity level along with consuming healthy and balanced diets. The present study discusses the consumption of livestock-origin foods with high nutrient contents that … …American Journal of Animal and Veterinary Sciences, Vol. 17, Issue 1 · 21 Mar 2022 · 6,425 accessesView PDFCite