Synthesis of inorganic nanostructures with specific size and well defined morphologies has attracted considerable attention due to their superior electrical, optical, magnetic, and chemical properties. Up to now, vari...
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Synthesis of inorganic nanostructures with specific size and well defined morphologies has attracted considerable attention due to their superior electrical, optical, magnetic, and chemical properties. Up to now, various kinds of metal oxide, sulfide, and hydrate with controlled hierarchical and complex morphologies have been successfully synthesized.
Based on the requirements of the Meta-Synthetic Integrated Environment of Stratagem Research (MSIESR) to the management and utilization of the model resource, the issues on model construction, request, employment, int...
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ISBN:
(纸本)9780889867994
Based on the requirements of the Meta-Synthetic Integrated Environment of Stratagem Research (MSIESR) to the management and utilization of the model resource, the issues on model construction, request, employment, integration, management and control, etc, are researched thoroughly from three aspects, i.e. integrated management, modeling on-demand and simulation on-demand. Thus, the mechanism of Modeling and simulation On-Demand (MSOD) is constructed, which is a kind of effective solution to deal with the difficulty of realizing and utilizing different model resources openly and dynamically.
The presence of salt has a profound effect on the size,shape and structure of sodium dodecyl sulfate(SDS)*** have been a great number of experiments on SDS micelles in the presence and absence of salt to study this co...
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The presence of salt has a profound effect on the size,shape and structure of sodium dodecyl sulfate(SDS)*** have been a great number of experiments on SDS micelles in the presence and absence of salt to study this complex ***,it is not clear yet how electrolyte ions influence the structure of *** describing the compromise between dominant mechanisms,a simplified atomic model of SDS in presence of salt has been developed and the molecular dynamics(MD)simulations of two series of systems with different concentrations of salt and charges of ion have been *** of micelle size is founded at relatively high concentration of SDS and low charge of *** the counter-ion pairs with head groups are formed,the transition of micelle shape is not observed because the charge of cation is not enough to neutralize the polar of micelle surface.
At present, the load modeling is still one of the difficult problems in power system. In this paper, a new method is presented which uses wide-area measurements and support vector machine (SVM) for load modeling. Base...
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Abstract: In order to find the cause of the shaft crack appeared in a 600MW steam turbine generator, several measurements are taken. The shaft assembly consists of three parts: shrink-fitted coupling, shaft and key wh...
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Abstract: In order to find the cause of the shaft crack appeared in a 600MW steam turbine generator, several measurements are taken. The shaft assembly consists of three parts: shrink-fitted coupling, shaft and key which are used to transfer torque between coupling and shaft. First, the natural frequency of the shaft system is calculated. The result shows that the vibration signal contains the frequency nears the second natural frequency of the steam turbine shaft system. Second, stress field near the damaged coupling and shaft is analyzed using finite element method. The torque under different operation condition is calculated before stress analysis and applied to the shaft assembly, then. And, local stress concentrations position calculated is proved to be coincident with the place crack initiation. Finally, the cause of the fault is analyzed: at least three causes have found to be having something to do with the crack fault.
This paper deals with the rendering issues of producing a realistic surgery simulation in real-time. In general, the visual fidelity of the simulator determines the degree of realism experienced by users. On top of th...
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Recently, DG (distributed generation) is rapidly developed around the world. But there are several problems in the grid-connected operation. The paper focuses on the selection of proper transformers to meet the ground...
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Recently, DG (distributed generation) is rapidly developed around the world. But there are several problems in the grid-connected operation. The paper focuses on the selection of proper transformers to meet the grounding requirements in the distribution networks. Through theory analysis and simulation, optimal selection methods are proposed. Yg/¿-connection transformer is suitable for small resistance grounding distribution networks while ¿ /Yg and ¿ / ¿ connection transformers are fit for small current neutral grounding networks. The conclusions are useful for the DG-connected power system.
In order to fully understand the characters and working principles of non-grid-connected wind turbine, this paper makes an analysis on different methods for modeling non-grid-connected wind turbine. First, according t...
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In order to fully understand the characters and working principles of non-grid-connected wind turbine, this paper makes an analysis on different methods for modeling non-grid-connected wind turbine. First, according to the structure of the wind turbine, a theoretical model is presented, including three subsystems: rotor, transmission system and generator. Response of the model to a wind sequence is simulated. Then, based on the data gained from experiment, a model of small wind turbine is presented using system identification. The main content of the model is the performance coefficient Cp derived from experimental data. A comparison is made on the simulation results of the model and the data measured. With simulation results of the two methods for modeling wind turbine, by using theoretical analysis and identification respectively, we can see the two models are both effective; only that they should be applied in different conditions.
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