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Aimed at solving the problems of complicated external environment and impossible continuous automatic measurement in observation of subgrade temperature fields in seasonal frost region, a multichannel subgrade temperature measurement system was constructed with Pt100 RTD sensors, ATMEGA16L single chip, PCF8563 clock chip, AT45DB041D external memorizer, AD7709 AD converter and MAX3232 serial interface,...
The uncertainty of electrical power load has much effect on power grid's transfer capability. From the point of spreading Synthetic Load Model by State Grid Company, a risk assessment algorithm for power grid's transfer capability was developed, which was based on the risk source of uncertainty of electrical power load parameter. The risk aroused by uncertainty of electrical power load parameter was...
In recent years, there has been active research on exhaust gas waste heat energy recovery for automobiles. In this paper, the thermoelectric energy system with parallel configuration is proposed and implemented for automobiles. Compared with the series-connected thermoelectric energy system, the parallel-connected thermoelectric energy system offers higher overall efficiency with bidirectional converter...
Lodging in maize causes severe yield loss annually. In this study, a total of 687 growing counties in or near Huang-Huai-Hai Plain, China were chosen as study area. First, cultivar lodging resistance was determined based on frequency distribution analysis using the data of national regional trials for maize cultivar in recent 9 years. Then, environment lodging stress was assessed based on probability...
The kink phenomenon in heterojunction bipolar transistors (HBTs) is introduced and mathematically analyzed. A novel composite transistor based on feedback theory is proposed to suppress the kink phenomenon with negligible increase in chip area and power consumption. According to the small-signal analysis, the output impedance of the composite transistor can be represented by an RC series circuit....
Hydraulic accumulator type braking energy regeneration system have the advantages of high power density, low cost and reliable property, which is suitable for the traditional engine driving bus. The variable displacement hydraulic pump/motor is used the braking energy recovery system as regeneration conversion device, its structure parameters affected braking energy recovery rate and regeneration...
This paper introduces a conduction interference test apparatus. It mainly introduces the conduction interference testing circuit-LISN and hardware design of the function circuit, such as: L/N line selection circuit. limiter circuit and the interface circuit between RS232 and computer.
The high-frequency wave chopper cascade speed- adjustment driver system has an overt advantage on energy saving and improvement on high voltage, huge power fan blower and water pump. As a result, It is widely used at lots of technical locale in China. However, for the different control mode with traditional shifting phase burst mode, some changes have taken place on the main circuit and inner characteristic...
In the development of hybrid electric vehicles (HEVs), more and more researches are concentrated on the renewable energy sources. Due to the limitation of the previous maximum power point tracking algorithm (MPPT), these renewable energy systems are controlled separately. In this paper, an optimal solar-thermoelectric hybrid energy system for HEVs is proposed with MPPT. This method can track the global...
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