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Through experiments and simulations, the piezoresistance coefficients of AlGaN / GaN HEMT under different gate voltages in the structure of micro-accelerometer are studied. The results show that piezoresistance coefficient at room temperature (RT) is equivalent to (2.47±0.04)×10–9 Pa−1, which is higher than that of silicon. The Current-Voltage characteristics of HEMT at different gate voltages were...
The advantage of magnesium ammonium phosphate (MAP) precipitation method is the integrate of wastewater treatment and resources recovery. But generally, there have Ca2+ and Mg2+ in the wastewater, so there may have MAP and hydroxyapatite (HAP) simultaneously in the precipitate. The MAP can be used as slow release fertilizer directly; the HAP is just used as industrial raw material. So, the value of...
The landfill leachate was treated by magnesium ammonium phosphate (MAP) precipitation method. A series of single factor influence tests were conducted and the influence of these factors to MAP precipitation was analysed in this paper. The results showed that the optimum condition of MAP recycling were as follow: the best reagent was MgCl2·6H2O, the best pH value was 10, the best proportion of reagents...
In order to study crystallization behavior of magnesium ammonium phosphate(MAP) under different conditions, the crystals were obtained by chemical precipitation in de-ionic water with NH4Cl, MgCl2 and Na2HPO4.Through the XRD and SEM methods, it is found that MAP were transmuted into Mg3(PO4)2 when pH from 9 to 12. In the condition of pH=9, Mg3(PO4)2 were transmuted into MAP with the increasing of...
Magnesium ammonium phosphate(MAP) crystallization method is a new and high-efficiency technique to remove ammonia nitrogen and phosphorus from wastewater. The MAP can be recovered and used as slow-released fertilizer or industrial chemical, and the wastewater recycling is achieved by this method. There are a few studies of MAP crystallization reactor at home and abroad. In this paper, the mechanism,...
In this paper, we use a novel way to research the piezoresistance coefficients of AlGaN/GaN HEFT affected by the changes of temperatures in the structure of micro-accelerometer. It is shown that saturation current of HEFT would decrease with the increasing temperature, which is about 0.028mA/°C. However, the device can work well at the temperature range of -50°C to 50°C, which indicates that it can...
The traditional landscape garden teaching methods can not meet the needs of students learning at any time and at any place. Therefore, a campus tree species management information system based on .Net technology was developed. This system is picture-based, together with the detailed text description, to provide a platform for students studying at any time and at any place. This system also provides...
The accurate diagnosis of rice pest insects and diseases is very important for high yielding and high quality cultivation of rice. Because the characteristics of rice pest insects and diseases are miscellaneous, and its occurred environment is complex, it is difficult to diagnose accurately using artificial intelligence system. In this study, BP neural network technology is applied to a rice pest...
In this paper, an ESR continuous casting system was introduced. The consumable electrode was transmitted alternately with two sets of nut-screw pair, each transmission pair equipped clamp-on gripper. The system controlled under a combination of single-chip microcomputer and programmable logical controller. With automatic control circuit and sensors, the consumable electrode can achieve continuous,...
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