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Passive radiative cooling below ambient air temperature under direct sunlight
Passive radiative cooling below ambient temperature direct sunlight
2015/8/6
Cooling is a significant end-use of energy globally and a major driver of peak electricity demand. Air conditioning, for example, accounts for nearly fifteen per cent of the primary energy used by bui...
Experimental Analysis of the Effects of Fuel Injection Pressure and Fuel Cetane Number on Direct Injection Diesel Engine Emissions
Diesel engine Injection pressure Emission Cetane number
2009/10/12
The e ects of di erent fuel cetane numbers and fuel injection pressures on a diesel engine emission were investigated. For this purpose, fuels with 46, 51, 54.5 and 61.5 cetane numbers were tested in ...
直联式空压机PWM变占空比控制（Changing Duty Ratio PWM Control of Direct-drive Air Compressor）
直联式空压机 直流无刷电动机 变占空比
2009/8/11
研究了一种用直流无刷电动机驱动的直联式空压机，借鉴直接转矩控制的思想，根据直联式空压机负载的特点，提出了一种基于单片机的脉宽调制(PWM)变占空比控制方法。根据空压机负载，将控制周期中的每一拍设置成不同的占空比。给出了基于Simulink的仿真计算，仿真结果表明，这种控制方法简单可行，直联式空压机转速波动较小，且有较好的稳定性和抗干扰能力。试验结果表明，PWM变占空比控制能达到节约成本，提高效率，...
Improving the Performance of Two Stroke Spark Ignition Engine by Direct Electronic CNG Injection
Two-stroke spark ignition engine direct injection CNG
2010/1/15
Two stroke spark ignition engines have high exhaust emissions and low brake thermal efficiency due to the short circuiting losses and incomplete combustion, which occur during idling and at part load ...
Simulation study on the performance of different direct torque control methods for permanent magnet synchronous machines
永磁同步电机 直接转矩控制 磁链误差补偿 空间矢量调制
2008/3/10
提出一种用于永磁同步电动机的基于磁链误差矢量补 偿的直接转矩控制（EFVC-DTC）策略，给出了磁链误差矢 量的估计算法，并将该控制策略下的稳态和动态运行性能与 常规 DTC 进行比较。仿真及实验结果表明 EFVC-DTC 可以 使电力开关器件工作在基本固定的频率上，磁链和转矩脉动 显著减小,比常规 DTC 具有更优越的稳态性能，而动态转矩 响应几乎与常规 DTC 相同。
期刊信息
篇名
The evidence from inclusions in pumices for the direct degassing of volatiles from the magma to the hydrothermal fluids in the Okinawa Trough
语种
英文
撰写或编译
作者
Yu Zenghui,Zhai Shikui,Zhao Guangta...