Applied Mechanics and Materials Vols. 416-417

Abstract: This paper, focusing on the practical moving condition of the thermal power plants, studied in detail that how to did the curve fitting according to the units data collected from Tianjin Dagang Power Plant; studied the each fuel loss in the process of start-stop the units and their calculation methods; and put forward that fuel consumption and life expenditure while starting and stopping the units should be considered when using peak-load regulation; worked out the GA program and proved GAs accuracy and superiority through the calculation examples, and showed that GA had great practical and research meaning.

Abstract: This paper designs a kind of new electrolytic capacitor-less LED (light-emitting diode) driver, which converts the commercial ac voltage to a pulsating current with twice the line frequency driving high-brightness LEDs. As no electrolytic capacitor is used, this driver possesses the unique advantage of long lifetime to match with that of LEDs. A method of injecting the third and fifth harmonics into the input current to reduce the peak-to-average ratio of the output current is also proposed. A 25V, 0.35A output prototype is built and tested in the laboratory, and the experimental results are presented to verify the effectiveness of the electrolytic capacitor-less LED driver and its control method.

Abstract: Using the finite element method and all kinds of numerical simulation method, A large-scale system of linear equations is solved eventually,the solution method of the system of equations largely determines the solution efficiency and precision of numerical calculation. The Jacobi iteration preconditioning conjugate gradient method is adopted, Both overcome the coefficient matrix pathological characteristics and the characteristics of slow convergence speed ,and avoid the disadvantages such as Newton's method to store and Hessian matrix is calculated and inversed,improve forward modeling calculation speed and accuracy. Guarantee for solving numerical stability and efficiency ,of the thick grid combined with verification, the algorithm is feasible and it is verified by coarse grid combine with fine grid.

Abstract: Based on the research of Power-cycle Nested Graph, the decomposition method of single point sector has come up. By the use of the process of clawed nested-cycle graph and nested-cycle sub-graph, the edge-balanced index sets of the power-cycle nested graphare solved whenand. Besides, the constructive proofs of the computational formulas are also completed.

Abstract: On the basis of this article in the use of automation and control theory of factor analysis and cluster analysis to analyze the problems of university graduates reflected, to resolve these problems, focus on one of the root causes of these problems is not college students on the course of self-management science, the author use the greedy algorithm dialysis college students how scientific management of social work, and the corresponding countermeasures.