Correction Technology on active power factor is now widely used in AC-DC power supply circuit to eliminate harmonic of power system, to improve the power factor. Firstly the method of power factor correction technology is set out. Secondly, the basic principle of active power factor correction technology is analyzed, then the control method for active power factor correction technology is given. Finally the development trend of active power factor correction technology is analyzed.
Application of the Internet of things technology in intelligent traffic control field will improve the intelligent traffic control level and the level of information service. FPGA design consists of design input, comprehensive, functional simulation (simulation), design, timing simulation (simulation), configuration of six steps. The paper presents application of microcontroller FPGA technology in designing intelligent transportation system Internet of things. Experimental results show that the proposed method has high in intelligent traffic control system effect.
Firstly, this paper analysed the existed problem on traditional controlling way of city water supply system, then elaborated the controlling principle of frequency conversion. Finally, a designed practical example by frequency conversion technical is given on the water supply system. It is proved that frequency conversion can maintain constant pressure water, and it is a very ideal efficient measure for energy saving. Therefore design and transformation on water supply system has a broad market application prospect.
Variable-capacitance micromechanical accelerometer is widely used because of its high
sensitivity and low power. Therefore, the further study on its performance has much theoretical and
applicable significance. This paper takes the closed-loop bias stationary comb-finger
variable-capacitance accelerometer as an example, introduces its operation principle, establishes its
mechanics model through analysis, and gives force balance equations. Then it researches and
analyzes its performances such as electrostatic forces, full scale, stability, resolution and so on. Based
on the model of the parameters from the accelerometer, key expressions were acquired. These
expressions reflect and affect electrostatic forces, measure range, stability, sensitivity of the
accelerometer. The results prove that performance of the accelerometer are connected with the
dimension of the beam, the mass, the area of the pole plate, bias voltage, feedback voltage and so on.
This work will provide a reliable theoretic foundation for the further optimum design of
variable-capacitance micromechanical accelerometer.
In an increasingly competitive global market environment, supply chain competition has become the key content of industry competition in the new period. At present, the real competition is not the competition between enterprises and enterprises, but competition between supply chain and supply chain. While the key of the supply chain competition is the competition of logistics network, an efficient and suitable for logistics network can not only help enterprises to seize market share, but also can greatly reduce logistics costs to improve enterprise core competitiveness. To solve the problems existing in the supply chain network expansion, I use genetic algorithms to make model optimization.
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