نتایج جستجو برای: low frequency

تعداد نتایج: 1586424  

In this paper, the Unified Power Flow Controller (UPFC) is enhanced with a Chaotic Particle Swarm Optimization (CPSO) Damping Controller in order to mitigate the Low Frequency Oscillations (LFO) in a Single Machine Infinite Bus (SMIB) power system. The designed damping controller is an optimized lead-lag controller, which extracts the speed deviation of the generator rotor and generates the out...

Foam injection is widely applied in amounts of fields to drilling, production, and formation protection. Sometimes, the application result is disappointing, which is caused by the failure of bubble generation in foam flooding. Therefore, it is necessary to seek ways for improving the performance of foam injection. An increased disturbance to the stratum, like the vibration caused by a seismic o...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس 1394

چکیده هدف: اعمال تحریکات الکتریکی با فرکانس پایین (low-frequency stimulation; lfs) اثر مهاری بر روند کیندلینگ دارد. مطالعات قبلی نشان داده که این اثرات مهاری تا حدی وابسته به فعالیت گیرنده های آدنوزینی است. در مطالعه حاضر نقش مسیر های مختلف موثر در تولید و حذف آدنوزین و نقش آنها در اعمال lfs مورد بررسی قرار گرفت. مواد و روش ها: حیوانات با تحریک الکتریکی (12 بار در روز) مسیر پرفورنت کیندل شدن...

Journal: :journal of operation and automation in power engineering 2007
n. bigdeli e. ghanbaryan k. afshar

in this paper, the unified power flow controller (upfc) is enhanced with a chaotic particle swarm optimization (cpso) damping controller in order to mitigate the low frequency oscillations (lfo) in a single machine infinite bus (smib) power system. the designed damping controller is an optimized lead-lag controller, which extracts the speed deviation of the generator rotor and generates the out...

2016
Susana T. L. Chung Gordon E. Legge

PURPOSE The contrast sensitivity function (CSF) provides a detailed description of an individual's spatial-pattern detection capability. We tested the hypothesis that the CSFs of people with low vision differ from a "normal" CSF only in their horizontal and vertical positions along the spatial frequency (SF) and contrast sensitivity (CS) axes. METHODS Contrast sensitivity for detecting horizo...

Journal: :The Journal of the Acoustical Society of America 1994

Journal: :The Journal of the Acoustical Society of America 1983

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