Applied Mechanics and Materials Vols. 602-605

Abstract: For spreading capture large computation and computational problems of slow, capture method is proposed based on GPU acceleration, the conversion cycle-related acquisition algorithm based on CUDA thread blocks for the implementation of the process, so spreading the capture process is completely in the GPU to accelerate implementation, achieve better results in the calculation, while significantly improving the computational speed of operation. Experimental results show that GPU-based capture method effectively improve the efficiency of the system, compared to CPU operation speed is increased by about 42 times.

Abstract: Considering the physical layer specification of the IEEE802.11 protocol as background, a novel LSE (least square estimation) algorithm based on power-delay profile of wireless channel is proposed. In multi-path time-variant channel, receiver carries out a primary MMSE estimation using training symbols and pilots of OFDM symbol firstly. Then the channel impulse response is obtained from frequency response estimated by MMSE. Finally, LSE algorithm is applied to revise the channel impulse response according to the power-delay profile. The LSE algorithm can reduce the noise level of MMSE estimation in time-domain which is equivalent to increasing the SNR to the output of 2-D wiener filter. Simulation results confirm that the proposed LSE algorithm gains a better performance in contrast to MMSE algorithm. As the Doppler frequency shift increases, LSE outperforms more significantly than MMSE algorithm.

Abstract: Ocean energy is a precious pearl. However, in the exploitation of the sea of people, the available development of ocean wave energy method is too simple and the structure of the device is relatively complex. This paper examines the analysis for the direction of the waves along the coast, and designed a dual-channel ocean wave energy generation device as well as having made a detailed description of its structure and concrete working principle. The ingenious engineering design of the device can continuously generate electricity. As the waves of high and low tides will produce mechanical energy to drive the rotation of the impeller, the improved design in this paper make full use of this principle so that can produce a steady stream of electricity. Due to the inherent advantages of this device, it has great room for improvement and broad application prospects.

Abstract: This paper introduces the working principle of ADN2841 and analyzes the main features and the typical application circuit of ADN2841. The laser communication transmission modulation circuit design for the 14 foot butterfly package directly modulated lasers is proposed, and according to the realization and debugging, we summarize the ADN2841 application experience and pay attention to the problem.

Abstract: The traditional strain acquisition system transmits the signal by wire, but the signal attenuation would happen when the wire is long, and the line maintenance would cost a lot of manpower and money. This paper has designed a high speed strain acquisition which could transmit data through the wireless sensor network, this solution we provided has overcame the signal attenuation, and comparing the cost of the systems is lower. It is proved by the experiment that this solution can ensure the signal’s accuracy and complete the normal strain acquisition.

Abstract: Power communication network traffic prediction is important basis of safely assigning and economically running. The forecasting precision will directly affect the reliability, economy running and supplying power quality of power system. Paper first expounds the electric power communication network traffic prediction research present situation, summarized the characteristics of the forecast and the influencing factors, summarizes the commonly used method, is put forward to the return of the electric power communication network traffic based on libsvm prediction method, and the PSO (particle swarm optimization) algorithm is adopted to model parameters optimization, with the test set error as the decision, based on the optimization of model parameters, choice, makes the prediction precision is improved.

Abstract: This article will Wave Mesh wireless ad-hoc network technology is applied to urban LED street lamp management system,with the single chip microcomputer 80C51F310 as the core,using real-time sensor testing environment brightness, and according to the brightness level of brightness, the LED street light illumination automatic adjustment;Aiming at the condition of the midnight staff less activity,using pyroelectric infrared human detection to control the brightness of the street lamp, the experimental data proved that energy saving effect is remarkable.The system safe and reliable, low cost,It has the advantages of single lamp remote monitoring,automatic dimming,electric energy measurement,alarm,fault diagnosis and fault location,etc.

Abstract: This paper presents a multi-objective optimization model to solve the volatility and anti load characteristic of wind power. The pumped storage power station is introduced in this paper. Though pumping and watering, the pumped storage power station can cut peak down to smooth the wind power. Given to the economical efficiency of wind farm, operation efficiency of the wind storage joint system is investigated. In order to improve the wind rate, minimize abandon wind is employed in objective function. To demonstrate the effectiveness of the proposed model, a practical example is tested. The result shows that this model is feasible and effective.

Abstract: The biggest used electronic products recycling area in China has accelerated the economic development of the local area, however, it also has caused severe damage to the ecological environment, and posed great threat to the local residents, for which heavy metal pollution bears the most responsibility. Based on sampling of soil in researching area and principal component analysis, we found that the elements Ni, Cr, Zn, Cu, Pb and Cd were from man-made pollution sources, and that the elements As and Hg were not correlated with other elements, and were from independent pollution sources.

Abstract: The acousto-optic effect is an important part of the optoelectronic technology, the basic principles and applications of acousto-optic effect have been introduced mainly based on the characteristics of acousto-optic effect in the paper, and we have summarized two acousto-optic diffraction ways---Raman Nath diffraction and Bragg diffraction, which are in application of the detection of planar defects, the acousto-optic modulation, acousto-optic deflection, acousto-optic modulation Q technology.