Applied Mechanics and Materials Vols. 687-691

Abstract: Sequence detection is used in many algorithms and applications. Sequences are different depending on different demands. In the process of floating-point CORDIC coprocessor design,data are need to change from floating point format to fixed point format. This process is necessary to detect the number of consecutive zeros. We design the leading-zero-counting algorithm to achieve this function, and this conversion process is completed in a very fixed short time, to ensure the needs of the floating point CORDIC coprocessor.

Abstract: In order to satisfy the personalized design of modern electronic products for LCD system, the transplantation technology is applied in this paper, which is based on STM32 MCU and the application of emWin graphics library. According to the function of the superiority of STM32 MCU and emWin graphics library, the hardware is designed, and the transplantation of emWin graphic library is finished on STM32 platform for the LCD display system. The LCD display system that has good practical effect is verified through practical experiment, of which results show that the LCD display system is steady, reliable, and friendly to the users.

Abstract: In order to remedy errors in wind power prediction, a common method adopted in wind farms is the configuration of a certain capacity of energy storage at the grid interface. The traditional approach for configuring capacity ignores the problems of excessive allocation and the adjustment of SOC, and for this reason, the paper proposes a model of wind power coupling by adding a resistance load at the grid connection point. In addition, this paper proposes a control strategy to improve the operation of energy storage systems through the adjustment of SOC in order to maintain a high level of SOC, and proposes a new approach to deploying storage capacity based on this. According to the analysis of a wind farm in Northeast China, a new approach to the configuration of the energy storage can use local utility of a little electrical energy to reduce the allocated capacity, and furthermore, this method also has better control characteristics.

Abstract: In this paper we present a coaxial filter analysis software based on MATLAB. Our software can obtain scattering parameters’ curve of the filter which is composed of high-low impedance coaxial cables. In order to obtain scattering parameters’ curve, we introduce a method of making distributed parameters equivalent to lumped parameters and adopt A parameter matrix approach to get it. Our software has taken into account the influence of step capacitances. Compared with the commercial software HFSS, our software has advantages of strong pertinence, operating fast and easy to adjust. Finally, we use HFSS to validate the correctness of our software.

Abstract: An experimental setup for indirect contact sensible heat TES was built. Air was chosen as the heat transfer fluid to flow inside the tubes and carry heat, while the mixture in the tank contacts the outside of the tubes. The results were also compared with pure sand filler material. It can be found that and the TES efficiency of mixture increased by 18% compared with pure sand, what’s more, its temperature gradient along the radical direction was also lower, while its temperature gradient along the axial direction was higher, so the mixture was better. Under various air inlet temperature (60-70°C), TES performances were similar, but for real power generation, further work on optimism temperature range was needed. Air velocity was also important to TES tank, lower velocity can not only increase the TES efficiency, but also enlarge the thermocline temperature gradient.

Abstract: In order to alleviate the energy constraint in smartphones, computation offloading is regarded as an effective solution. In computation offloading, how to partition a given application is one of the key issues. On obtaining the best partition, due to the time complexity of partition algorithm, most researchers give up looking for a global optimal solution but to find local optimal. In this paper, a global optimal application partition algorithm is presented, the main strategy is scaling down the problem through merging the correlated nodes firstly, then using 0-1ILP to obtain the partition in order to make the mobile energy consumption achieve global optimal minimum, thus it has less time complexity than 0-1 ILP. Experimental results show that the proposed algorithm made the same global optimal partition results as 0-1 ILP, while it consumed less time and energy than 0-1 ILP.

Abstract: In order to improve the nonlinear problems of power amplifier, this paper discussed about the nonlinear characteristic of power amplifier without memory and put forward a kind of new pre-distortion model. The MATLAB simulation process was being used to obtain the input and output amplitude curves, and calculated the normalized mean square error NMES and error vector magnitude EVM, the results show that the power amplifier linearization improved after pre-distortion processing.

Abstract: As the non-uniformity of multi-channel output in ultra-high resolution CCD imaging system causes image seam problem, CCD multi-channel output non-uniformity correction method based on TDI read-out way is put forward. This method images only with image irradiance point, and with one image, a large amount of correction measuring points can be gained; on one hand, accuracy matching output characteristics can be ensured, and on the other hand, the influence of light source adjustment on correction outcomes can be erased. Experimental results show that, this method has high degree of correction accuracy, better than two-point method and multi-point method correction, and it can image only once.

Abstract: With the rapid development of distributed generation technology,a lot of renewable wind and solar power connect to the power system. Due to the random and intermittent characteristics of renewable energy, it brings a big challenge to the security and economical operation of power system. With the limits of climbing speed, non-renewable energy generation units cannot respond quickly to the change in the output of renewable energy generation units. Owing to the advantages of high luminous efficiency and long lifetime, LED lamps get rapid promotion and application in the smart distribution network. Based on the optical and electrical unique properties of LED lamps, the author studies the effects on the power system for a large number of LED lamps connecting to the distributed generation system, and establishing the mathematical model of LED lamp participating in the optimal dispatch of distributed generation system. In order to solve the model, the author uses gradient projection method. Through the SIMULINK simulation, it demonstrates that the algorithm has a fast convergence speed and high precision, and verifies the correctness and feasibility of the algorithm.

Abstract: This paper introduces the simulation model based on equivalent circuit and mathematical model of solar panels use matlab/simulink. The model can simulate the output characteristics of the solar battery board in different temperature and different light intensity. Simulation results close to the solar panels’ actual performance. This model offer convenience to build practical photovoltaic power generation system.