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Phase-locked technique is necessary for grid-connected converters to exchange power with grid. This paper presented a digital phase-locked loop (DPLL) algorithm based on phase adjusting at positive zero-crossing of every cycle. And then, an islanding detection method was proposed based on the DPLL into which a phase deviation was induced via modifying the phase-locked error. The results of simulations...
The platform is used to collect related information about human body motion timely and accurately, so that more penetrating scientific study will be carried out about human body motions. It utilizes multiple-knot network technology to gather multiple-point accelerations information which can be processed or transmitted to advanced computers to be comprehensively analyzed. The platform has already...
The early detection and monitoring of forest fire is important for fire suppression quickly and reducing the loss of human and property. At present, forest fire monitoring techniques based on wireless sensor networks have drawn more and more attention from both academic and forestry field. In order to reduce the cost of monitoring system, it is necessary to monitor a biggest area with sensor nodes...
The scientific and reasonable measure of energy efficiency is the foundation based on which government departments at all levels reach their energy-saving goals and make corresponding policies. With reference to the research results of other scholars, the paper gives a new definition of the energy-saving potential to evaluate energy efficiency. The definition is expected to cancel the inability of...
Water test was got in 2007. Controling the soil moisture content in yield forming stage. According to the analysis of the classical growth theory, established a peanut growth model under control the soil water. The model was studies by using one peanut cultivar Fenghua 1. A peanut pool-culture experiment under control of rain protection shed was carried out to keep relative soil water content of 0-30cm...
The scientific and reasonable measure of energy-saving potential is the foundation based on which government departments at all levels sets their energy-saving goals and make corresponding policies. With reference to the research results of other scholars, the paper gives a new definition of the energy-saving potential. The definition is expected to cancel the incomparability of industrial structures,...
A comprehensive survey of the up-to-date methods and technologies of forest fire detection and monitoring based on wireless sensor network (WSN) is presented. This paper discusses and analyses the system frame and the key problems of WSN-based forest fire monitoring, it focuses on the forest fire forecast modeling, WSN nodes deployment, WSN nodes and forest fire positioning, transmission control protocol,...
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