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To solve the problems of uncertain switching frequency and control hysteresis in traditional direct power control of three-phase voltage type PWM rectifier, this paper presents a new method to control three phase PWM rectifiers. The method is a kind of Direct Power Control (DPC) which is based on Model Predictive Control (MPC). This method uses voltage vector of the supply network as the base vector...
Government intervention in transition period is one of the critical influential factors of merger efficiency, and there is much less research in this field. This paper deeply analyzed the effect of government intervention on merger efficiency from the multidimensional perspectives of the executive level of government intervention, transferring of state-owned control right and changing of final controller...
In Modern Chinese, "V+N" structure as a common pattern is a typical combination to form verb phrases. This paper, based on Sogou log corpus, in which the "V+N" verb phrase was researched and described from the perspective of the characteristics of constructional elements, semantic features and syntactic function, provides a theoretical basis for the development of search engine...
With the purpose of solving the continuous supply of energy of wireless sensor network in the water environment, wave power is utilized for wireless sensor nodes. Based on mechanical movement principle and electromagnetic induction. This paper has designed two mini generator, namely gear device and pulley device. The electrical energy which mini generator generates puts aside the battery via AC-DC...
Semiconductor manufacturing is one of the most complex manufacturing process. And job scheduling is a major problem in the semiconductor operation. A method of job scheduling in semiconductor manufacturing lines is proposed based on genetic algorithm and simulated annealing algorithm. Firstly each job is given a set of machine processing set* based on genetic algorithm, then the processing sequence...
Through constructing to refilling the dry dock for the tunnel cross Haihe River in Tianjin Binhai New Area, the slope of the dock will be undergoing three stages, i.e., excavation, water filling and water draining, respectively. The stability of the dry dock slope is studied by using Fellenius method of slices and Bishop simplified method. At the excavation stage, the soil disturbance is considered;...
Pulse width modulated (PWM) inverter can generate common-mode voltage (CMV) which will decrease the system reliability. Firstly, some theoretic analysis and experimental results validate the characteristics of CMV and its adverse effects in this paper, and the methods for its cancellations are also presented. Then a novel inverter output active filter based on a single-phase inverter and a five-winding...
According to the city energy consumption character in China, this article forms a city energy conservation evaluation index system. It contains 27 indexes in 3 levels and 4 parts about industry, building, city transportation and residential consumption. According to some standard, the article divides city energy conservation level into 4 classes and forms energy conservation evaluation model. In the...
To measure the degree of basic service of wireless sensor network (WSN) with denial of service (DoS) attacks, it is necessary to evaluate survivability of WSN. This paper presents new method based on services and Markov Chain. It distinguishes services, analyzes influence of services under DoS attacks, gets the formula of survivability. Probability of states is obtained by markov chain, then the quantitve...
The present study was to investigate the protective effect of Echinacea, purpurea (E. purpurea) extract, a natural scavenger of peroxynitrite (ONOO-), on the biomolecules injury induced by ONOO- in vitro. The results showed that E. purpurea extract could prevent the ONOO--mediated damage in tyrosine nitration, low density lipoprotein (LDL) oxidation and DNA strand breaks. The ONOO- scavenging ability...
In this paper we study the video streaming bandwidth of peer-to-peer streaming networks where the underlying topology is a complex network. We focus on the maximal streaming rate and how it depends on the type of network. We consider networks such as small world networks, scale free networks, locally connected networks and random networks. The experimental results indicate that a more connected graph...
Offshore wind farm has been one of the most effective ways to wind energy exploitation, and many new technical and economic problems are brought with development of large offshore wind farms. Electric distribution system plays an important role in reliable operation of large offshore wind farm and holds considerable proportion in total investment, so that optimization of the system is one of the key...
The flux estimating techniques currently used in the variable speed motor control are based on dynamic equations. It leads to the concern about the stable, fastness and error accumulation problems. In this paper, a new stator flux calculation method based on the multi-rate output sampling is proposed. By arranging the current sampling speed twice as fast as the control voltage updating speed, we can...
Radio-frequency identification (RFID) is contactless automatic identification technology which is rapidly development lately. In order to intelligent management systems using RFID technology have the ability of location identification, design scheme of RFID reader using multi-antenna of difference spatial location is presented in this paper. It is a separated setting of reader and multi detecting...
Pulse width modulated (PWM) inverter can generate common-mode voltage. Common-mode voltage can produce charge-discharge current at the distant of every insulated gate bipolar transistor (IGBT) high-speed switching. This current creates leakage current escaping to earth through stray capacitors inside motors. The large leakage current can create electromagnetic interference (EMI) and short the life...
Pulse width modulated (PWM) inverter can generate common-mode voltage. Common-mode voltage can produce charge-discharge current at the distant of every insulated gate bipolar transistor (IGBT) high-speed switching. This current creates leakage current escaping to earth through stray capacitors inside motors. The large leakage current can create electromagnetic interference (EMI) and short the life...
The paper analyzes the robot link's positioning error sources and builds its error model of geometrical parameters. With the aid of the genetic algorithm (GA) that has the powerful global adaptive probabilistic search ability, 24 parameters of a 6-DOF robot are identified through simulation, which makes the robot's position and orientation accuracy an great improvement. In the process of the robot...
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