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We propose a novel Pub/sub protocol for Wireless Mesh Networks based on Heuristic Markov Chain, namely HMCPS, which can reliably and efficiently deliver events to mobile clients in a continuous manner. Using Heuristic Markov Chain, HMCPS predicts hot locations where a mobile client may stay with high probability, and then delivers interesting events to the hot locations in an efficient way. We also...
Microbial biofilms are encountered in a wide variety of applications, especially in wastewater treatment systems. Biofilm dynamics in wastewater treatment has been paid much attention, and the simulation of the biofilm growth has been studied with many approaches in recent years. To simulate the real microbial biofilm growth, this paper proposed the confined diffusion limited aggregation (DLA) models...
Probabilistic distribution parameters of wind speed in wind farms are quite important to the wind energy statistical characteristics. Based on the rule that the probabilistic distribution of wind speed obeys the dual parameters Weibull distribution, three different methods including least-square method, average wind speed and standard deviation estimation, and average wind speed and maximum wind speed...
In order to research on the water filling and emptying process of a pressured-pipeline in long distance, according to the characteristics for the pressured-pipeline in the long distance during the filling and emptying process, the strategies of sectional treatment and water filling and emptying in succession were adopted. For each segment of the pipe, a mathematical model was established with using...
The 3-D turbulent flow in 90 ° bend pipe of circular section of hydroelectric power station diversion road was simulated numerically by realizable k-e turbulence model with FLUENT. According to the analysis on internal flow field and distribution of elbow flow-field, we drew the best measuring section and provided a theoretical basis for measurement of bend flow.
A large drainage pumping station by lateral oblique water way, which installed five shaft tubular pump, with single pump design flow 34m3 / s. The numerical simulated and hydraulic optimization is worked by using three-dimensional simulation software CFD on pumping station pool rectifier. Analysis results from numerical simulation: within a certain hydraulic losses range, the retaining water weir's...
The contact problem of single-row four point contact ball type slewing bearing, which is exposed to bearing radial load and axial load, was analyzed with Hertz theory. Then VC program of the slewing bearing was given according to calculation formula of contact stress, contact angle and deformation. Taking hydraulic excavators as example, the contact stress and contact angle were calculated in different...
Conventional Savonius rotor is a ldquoS-shapedrdquo cross-section rotor, the power performance coefficient (CP=0.15) is rather low. This study introduces a new type-helical Savonius rotor, applies calculation fluid dynamics (CFD) to analyze and improve the performance of the rotor from aspects ratio(H/D), number of blades, overlap distance and helical angle(thetas). The results show the performance...
Consider the parameter uncertainty of the wind power station, wind energy conservation systems state space model with uncertainty is modeled based on Takagi-Sugeno fuzzy models. The robust stability for the kind of wind energy conservation systems is analyzed based on fuzzy control theory. Parametric expression of fuzzy control controller is given based on feasible solution of linear matrix inequality...
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