A fast multilevel multipole (FMM) algorithm is derived for the Helmholtz equation and adopted to the symmetric Galerkin boundary element method (BEM) for acoustics. The FMM allows to evaluate a matrix-vector product of the BEM with the computational cost of O(N log 2 N) , thus leading to a significant reduction of computation time and memory requirements compared to standard BEM formulations with computational cost of O(N 2) . This allows the simulation of large scale acoustic models. The performance of the algorithm is demonstrated on the exam ....etc

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This paper highlights some effects of an asymmetrical design on three phase multilevel inverters from a supply network point of view. The investigated topology is based on a series connection of single phase inverters (partial cell) in each phase. Each partial cell is fed through a three-phase diode rectifier for a unidirectional power flow, fed itself through the secondary of the power transformer (PT). From analytical relationships in continuous and discontinuous current conduction mode, itâ„¢s shown that a symmetrical multilevel inverte ....etc

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i am a final year student of electronics & comm. Engg. . I am looking to work on the project Automatic multilevel car parking. I need your help in this matter.
i wanted to know how the car is automatically placed at the vacant position without driver.
Is it by the use of Rollers in the lift or what ??
please help me in this regard.




--tribhuvan ....etc

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Multilevel voltage source converters are emerging as a new breed of power converter options for high-power applications. Here, staircase voltage wave is generated from several levels of dc capacitor voltages. the voltage unbalance between different levels is the major disadvantage of multilevel converters. voltage clamping or capacitor charge control are the main techniques used to solve this. The following types of multilevel voltage source converters are described here:
a)diode-clamp: The diode-clamp method can be applied to highe ....etc

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i need basic operation of multilevel inverter operation animation ....etc

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This article describes about coupons.For the emerging class of social network and information sharing applications,coupons form an idea to define, evaluate, and
implement algorithms.To overcome highly variable Internet access through adaptive localized interaction,coupons allow users to opportunistically interact and share data through a wireless medium.To encourage participation,coupons allow the incorporation of an incentive scheme to make the system usable.Evolution of our society into a nearly constant access to the Internet takes place ....etc

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CARRIER PWM ALGORITHM FOR MULTILEG MULTILEVEL INVERTER

Nguyen-Van Nho1 and Hong-Hee Lee2
1Faculty of EE, HCMUT, 268 Ly Thuong Kiet, District 10, Hochiminh City, Vietnam
2Department of EE, UOU, 680-749 San 29, Muger 2-dong, Ulsan, Korea


ABSTRACT
This paper presents a universal carrier based PWM method for multileg multilevel inverter on consideration of unbalanced dc voltage sources. Switching time diagram of PWM control in multilevel inverter can be transformed into a nominal switching two-level diagram. It will ....etc

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ABSTRACT

A new operational mode for diode-clamped multilevel inverters termed quasi two-level operation is proposed. Such operation aims to avoid the imbalance problem of the dc-link capacitors for multilevel inverters with more than three levels and reduces the dc-link capacitance without introducing any significant voltage ripple at the dc-link nodes. The proposed operation can be generalized for any number of levels. The validity of the proposed multilevel inverter operational mo ....etc

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PERFORMANCE STUDY OF MULTILEVEL TAG-CHECK FULLY ASSOCIATIVE CACHE ....etc

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Authors:
C.Govindaraju
Dr.K.Baskaran
Abstract:
This paper presents a generalized cascaded multilevel photovoltaic inverter topology for grid connected PV systems with hybrid phase disposition PWM control scheme. Hybrid PWM strategy based on the combination of fundamental frequency PWM and high frequency phase disposition PWM which reduces the power losses and improves energy efficiency. A digital proportional ....etc

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