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تعداد نتایج: 5551 فیلتر نتایج به سال:
This study addresses the problem of controlling a variable- speed wind turbine with a doubly fed induction generator (DFIG) by control System that called One-Cycle control (OCC). Generator-side converter regulator speed and Grid-side converter controls reactive power and voltage of the DC-Link. Proposed method under different conditions such as load change, fault and nonlinear loads are studie...
In this paper we give the first, to our knowledge, structures and corresponding algorithms for approximate indexing, by considering the Hamming distance, having the following properties. i) Their size is linear times a polylog of the size of the text on average. ii) For each pattern x, the time spent by our algorithms for finding the list occ(x) of all occurrences of a pattern x in the text, up...
Let T be a string with n characters over an alphabet of bounded size. The recent breakthrough on compressed indexing allows us to build an index for T in optimal space (i.e., O(n) bits), while supporting very efficient pattern matching [2, 4]. This paper extends the work on optimal-space indexing to a dynamic collection of texts. Precisely, we give a compressed index using O(n) bits where n is ...
This paper presents a new multilevel one-cycle control (OCC) technique for five-level diode-clamped converter (DCMC)-based static VAR compensator (STATCOM). The OCC algorithm in combination with multi-carrier level-shifted PWM is used the proposed DCMC-based STATCOM. automatic dc link voltage balance simply realized by four compensators presented as part of controller. In this principle two-lev...
The main concern about the bi-directional AC-DC converter is to maintain utility power factor near to unity. One Cycle Controller (OCC) is one of the outstanding control techniques to control these power electronic converters. One Cycle Controller comprises one integrator with reset along with a few linear components like analog comparators, flip-flops, and a clock. This paper presents a hardwa...
در این تحقیق تأثیر زمان های مختلف تیمار آنزیمی با اندوگلوکاناز و همچنین سطوح مختلف پالایش بر ویژگی های کیفی خمیرکاغذ occ بررسی شد. خمیرکاغذ occ تهیه شده با آنزیم اندوگلوکاناز با مقدار ثابت u1 (به ازای وزن خشک خمیرکاغذ) در زمان های مختلف (5/0، 1، 5/1 و 2 ساعت) در شرایط ثابت فرایندی تیمار شد. نتایج به دست آمده نشان داده که تیمار آنزیمی خمیرکاغذ occ در سطوح مختلف زمانی موجب بهبود ویژگی های فیزیکی ...
این تحقیق با هدف تولید کاغذ کنگرهای از مخلوط خمیرکاغذ سودا- آنتراکینون کاهگندم و خمیر OCC انجام شده است. کاغذهای دستساز در وزن پایه gr/cm2120، از مخلوط کردن خمیر کاهگندم رنگبری نشده با خمیر OCC در نسبتهای 25، 50 و 75 درصد تهیه شدند. خواص فیزیکی و مقاومتی این کاغذها اندازهگیری شد و با خواص کاغذهای مخلوط نشده مورد مقایسه قرار گرفت. نتایج نشان دادند که افزودن خمیر کاهگندم به خمیر OCC، خواص ...
The Open Cellular Convection (OCC) associated with cold air outbreaks is a common phenomenon over the North Sea where large number of wind parks are presented. Thus, reliable numerical simulations OCC events have great importance for offshore energy. We investigate ability to simulate using Weather Research and Forecast (WRF) model ERA5 reanalysis data as initial lateral boundary conditions OSI...
The Block Tree is a recently proposed data structure that reaches compression close to Lempel-Ziv while supporting efficient direct access to text substrings. In this paper we show how a self-index can be built on top of a Block Tree so that it provides efficient pattern searches while using space proportional to that of the original data structure. More precisely, if a LempelZiv parse cuts a t...
The launch of Osteopathic Continuous Certification (OCC) signifes the next stage of the osteopathic board certification process. The OCC process replaces the old recertification system for all osteopathic physicians who earned time-limited certificates from American Osteopathic Association (AOA) certifying boards. All 18 AOA certifying boards are now engaged in the continuous certification proc...
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