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This paper discusses a new way to solve the vehicles routing problems of logistics distribution with the use of TSA (Tabu Search Algorithm). TSA is used to calculate the cost of the dealer or the company of all filiale, which is based on the actuality that there are distribution tasks among filiale (or distribution centers) in the cooperative distribution. A new way here is established considering...
In order to make the protection characteristic of the electronic thermal relay conforming to the temperature-rising law of the motor, the disadvantages of action characteristic of the simulation electronic motor protector are analyzed in this article based on the international standard inverse time action math model for the electronic thermal relay, and inverse time characteristic of the simulation...
This paper proposes a method of monitoring and analyzing interharmonics in power system based on modified covariance arithmetic and virtual instrument. The system consists of sensors, signal conditioning circuits, transfer boards, data acquisition (DAQ) and compute, which the parameters of interharmonics are identified by using the modified covariance arithmetic of AR model, Some essential issues,...
Grid resource management plays an important role while enabling the sharing and coordinating of resources in grid computing environments. Resource reservation is an important part of the grid resource management. An advance reservation is a scheduling object which reserves a group of resources for a particular timeframe for access only by a specified entity or group of entities. Combining resource...
A major challenge facing grid applications is the appropriate handling of failures. Data replication is a key technique of data grid, from which, we can get better access performance. It is a fault-tolerant approach, but at the same time bringing some hidden trouble for security, so security and fault-tolerance should be colligated to research. Combining data replication with security, we propose...
Sulfur hexafluoride is a gas with high electronegativity. For its strong adsorption to the electrons, it is widely used in the gas insulation. A microscopic model is established in our work to study the motions of particles in sulfur hexafluoride gas. Particle in cell method is used to trace the motions of the charged particles and the collisions between electrons, ions and atoms are simulated by...
The formation of arc in high voltage equipment is an unbalanced gas disruption and the principles of it are important in apparatus switching. For the complexity of gas disruption principles, the modeling and computer simulations to the beginning of gas disruption are vital in this domain. Particle-in-cell method is adopted in our work to disperse the Boltzmann equation and build a mathematical model...
Based on the theory of Townsend discharge and the principles of energy conservation, an expansion model of gas breakdown channel is proposed according to the characteristics of discharge channels. Integrated coefficient is introduced to synthetically describe the phenomena of ionization, recombination and diffusion during the movement of particles. Moreover, the varieties and relations of macroscopic...
This paper studies the cause of servo lag error in cam noncircular grinding process and conducts the quantitative calculation of these servo lag errors. Due to the characteristics of cam noncircular grinding, the influence of servo lag errors on the cam contour error can only be reduced rather than eliminated by adjusting the numerical control system parameters. RBF neural network is adopted to predict...
This paper describes a double time difference of arrival (DTDOA) method with Kalman filtering for tracking a mobile node in an ad hoc network. The DTDOA method relies on a double time difference of data arrival without time synchronization of various nodes of the system. The Kalman filtering is applied to smooth the results for static node location as well as to predict a mobile node trajectory. The...
A microscopic model is based in our study which adopted the particle-in-cell and Monte Carlo methods to simulate the behavior of the electrons at the beginning of the discharge. The distance between the plane electrodes in our study is 64 mm. The gas temperature is 300 K and the DC voltage applied to the electrode is 1000 V. We trace the motions of a large amount of the electrons and assembled average...
In order to certify the function of ion to the gas discharge, a model of direct current discharge of argon, which includes the elastic and charge exchange collisions between ions and neutral gases, is examined using the particle-in-cell (PIC)/Monte Carlo collision (MCC) simulation. The structure of our electrode is one dimension and for the velocity of the particles, three dimensions calculation is...
Based on the theories of arc and gas discharge, a novel hybrid arc model in vacuum circuit breaker is proposed, considering the factors influencing on the arc formation from both microcosmic and macroscopic views. The evolution from initial discharge channel forming with breakdown to steady arc state is simulated. The results show that the radii of discharge channels are enlarging and the shapes of...
A concept of methane yield at optimum pH was advanced and subsequently a mathematical model that simulates the optimal pH of a batch process for anaerobic digestion of organic fraction of municipal solid waste (MSW) was developed and validated. The model was developed on the basis of the microbial growth kinetics and was divided into three processes: hydrolysis of substrates by hydrolytic bacteria,...
A new method combing improved total variation diminish scheme (TVD) with finite volume method (FVM) has been applied for calculating the N - S and K - epsiv equation of flow field in SF6 circuit breaker under cold gas breaking. In calculating, the influence of structure parameter on the interrupting performance is taken into consideration. Through the computation and analysis of dielectric recovery...
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