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The demand for power sensors is growing rapidly, and the demand for energy supply is becoming more and more obvious. The disadvantages of the traditional single-battery power supply scheme are becoming more and more obvious. At the same time, with the development of kinetic energy, temperature difference, photovoltaic, electromagnetic and other energy collection technologies and integrated circuit technologies, new ideas are put forward for the energy supply of power sensors. Promoting energy harvesting technology and power sensor coupling in smart grids can improve social benefits and form a win-win situation for all parties. This paper firstly analyzes the urgent demand of smart grid for energy harvesting technology. Secondly, the development status of energy harvesting technology and related integrated circuits is analyzed. Finally, according to the shortcomings of energy harvesting technology in smart grid, the research direction of energy harvesting technology suitable for smart grid is proposed.

In this paper, Brazilian disc splitting tests on coal rock specimens with bedding planes and corresponding simulations by combined finite/discrete numerical method(FDEM) were carried out.The results show that the angle of bedding plane have a significant influence on fracture pattern and tensile strength of coal.It is clear that as the angle of weak plane increases, the fracture pattern of models can be classified into four types, including stretching failure perpendicular to weak bedding planes, complicated sketching and shear mixed pattern, shear failure along the bedding planes, and sketching damage along weak bedding planes.As for the difference of tensile strength values, it is observed that when the load is perpendicular to the bedding plane, the effect of bedding structure on calculating tensile strength is negligible and the tensile strength value decreases with the angle rising up to the minimum value as angle reaches vertical.In addition, with respect to dissipated energy of coal samples, it is concluded that the dissipated energy gradually decreases when the angle of bedding planes are increased, which have a relationship with varied fracture patterns and strength values.

An embedded NOR Flash controller is descripted for quickly IAP(in application programming),no need of interrupt vector remap by software, but direct address remap by hardware reboot from middle location with dual Flash banks. The Flash controller can support read operation in the process of IAP, and get right read results. The Flash controller has a 1 ?滋s configuration register which can be used to calculate expected timing values for programming or erase automatically, reducing the software workload to configure more timing values one by one with different working frequency. It is verified after simulation and FPGA prototype verification,and taped out on UMC55 nm process in MCU. The samples of MCU with IAP working well prove further the Flash controller.

Visible light communication (VLC) technology, which utilizes LED lamps to achieve short range wireless communication, is a candidate technology for the next generation of wireless communication. Indoor high-precision positioning is of great significance for location based services (LBS) applications in areas such as the interior of buildings where cannot be located by GPS. This paper designs a visible light communication system that integrates high-precision positioning functions and achieves large-scale networking of 210 LEDs through power line communication (PLC). This system is suitable for future indoor mobile robot applications. The test show that the average data rate of visible light communication of this system is 130.9 Kb/s, and the achievable positioning accuracy is less than 3.5 cm. [ABSTRACT FROM AUTHOR]

Optimizing sowing date is the key cultivation measure to raise rice yield. Blanket-seedling mechanically transplanted rice has been used in a large production area in China. But study of how yield component characteristics of blanket-seedling mechanically transplanted rice response to different sowing date is relatively few. Therefore, there is a need for asystematic comparative study. In order to reveal the effect of sowing date on the yield component characteristics of different varieties of mechanically transplanted rice, a series of field experiments were conducted in 2012 and 2013 in the rice region of the middle of Jiangsu provinces under typical annual rice-wheat cropping rotation system with widely used rice cultivars of super japonica rice Wuyunjing 24 and indica-japonica hybrid rice Yongyou 2640. These cultivars are high in yield potential. The research were aiming to systematically analyze the dynamics of population stems and tillers, panicle characteristics, grain filling properties, and so on in different sowing date for mechanically transplanted rice. The results indicated that, with the delayed sowing date, population stems and tillers of mechanically transplanted rice increased with tillers during the earlier stage of growth, but those tillers died out rapidly during the middle and last stage of rice growth, causing a reduction of panicle maturity and obviously reducing the ratio of productive tillers to total tillers. Stem population and tillers from seedlings of early sowing dates were significantly (P<0.05) different from those in late sowing dates. When the sowing date was delayed, the panicle of mechanically transplanted rice was lessened. All of the panicle length, grain density, grain weight per panicle, ratio of No. of primary branches to No. branches of secondary branches, No. of branches per primary and secondary branch, grain number per primary and secondary branch and grain number per branch, seed-setting rate of primary branch and secondary branch were decreased. But ratio of total grains of primary branches to total grains of secondary branches was increased. Variations of characteristics in the indica-japonica hybrid large panicle rice were more drastic. There was no difference in the ratio of No. of primary branches to No. branches of secondary branches, and the ratio of total grains of primary branches to total grains of secondary branches and grains of primary branch. However, the other indexes of panicle were of significant (P<0.05) difference between early sowing and late sowing date. The postponed sowing date reduced the final weight of kernel of both the superior grains and inferior grains, resulting in grain weight decrease. With the sowing date delayed, the maximum grain-filling rate and mean grain-filling rate of superior grains were weakened. The time reaching the maximum grain-filling rate was delayed, and both the active grain-filling period and effective grain-filling time prolonged. The maximum grain-filling rate and mean grain-filling rate of inferior grains were not significantly(P>0.05) different, but maximum grain-filling rate and mean grain-filling rate in the fifth sowing date was the lowest, from which the time required to reach the maximum grain-filling rate delayed, the active grain-filling period shortened, and the effective grain-filling time prolonged. In conclusion, the suitable early sowing dates for mechanically transplanted rice would benefit rice production as followings:1) stem population and tillers of mechanically transplanted rice was steadilyincreased;2) panicles of maturity was adequate, the panicle structure was optimized, and seed setting rate was improved; and 3) the grain-filling time was longer, while the grain-filling rate was advanced and steady, especially the grain-filling characteristics of the inferior grain was optimized, more grain was filled. All the advanced characteristics would contribute to a stable and high yield. Thus, to increase rice production, sowing date of mechanically transplanted rice should be advanced to May 26 appropriately in the central part of Jiangsu province, in combination with timely transplanting and scientific cultivation and management practices. [ABSTRACT FROM AUTHOR]