A CMOS bandgap reference （BGR） without a resistor,with a high power supply rejection ratio and output be- low 1V is proposed. The circuit is suited for on-chip voltage down converters. The BGR is designed and fabric...A CMOS bandgap reference （BGR） without a resistor,with a high power supply rejection ratio and output be- low 1V is proposed. The circuit is suited for on-chip voltage down converters. The BGR is designed and fabricated using an HUTC 0.18μm CMOS process. The silicon area is only 0. 031mm^2 excluding pads and electrostatic-discharge （ESD） protec- tion circuits. Experimental results show that the PSRR of the proposed BGR at 100Hz and lkHz achieves, respectively, - 70 and 62dB using the pre-regulator. The proposed BGR circuit generates an output voltage of 0. 5582V with a varia- tion of 1.5mV in a temperature range from 0 to 85℃. The deviation of the output voltage is within 2mV when the power supply voltage VDD changes from 2.4 to 4V.展开更多
A new type of dehydration unit for natural gas was briefly described and its basic structure and working principles were presented. An indoor test rig for testing the unit performance was set up and the experimental r...A new type of dehydration unit for natural gas was briefly described and its basic structure and working principles were presented. An indoor test rig for testing the unit performance was set up and the experimental results were given. The results showed that the unit could attain a maximum dew point depression of about 20℃ without any need of external mechanical power and chemicals. The pressure loss ratio, shock wave and the flow rate had great influence on the dehydration characteristics. From the systematic analysis of the factors that affect the dehydration efficiency of the unit, the suggestions for improving the unit are put forward.展开更多
China is one of the countries most severely suffering from tropical cyclones. The exact and timely forecasting and warning is of significant importance in fighting against tropical cyclones and mitigating their impact...China is one of the countries most severely suffering from tropical cyclones. The exact and timely forecasting and warning is of significant importance in fighting against tropical cyclones and mitigating their impacts on China. The numerical weather prediction （NWP） system for tropical cyclone rainfall and strong wind is going to play a more and more important role. There is also a need for timely and user friendly modem warning services in order to provide the governments and relevant authorities at all levels and general public with typhoon forecasts and information about the associated disasters and response strategy services.展开更多
文摘A CMOS bandgap reference （BGR） without a resistor,with a high power supply rejection ratio and output be- low 1V is proposed. The circuit is suited for on-chip voltage down converters. The BGR is designed and fabricated using an HUTC 0.18μm CMOS process. The silicon area is only 0. 031mm^2 excluding pads and electrostatic-discharge （ESD） protec- tion circuits. Experimental results show that the PSRR of the proposed BGR at 100Hz and lkHz achieves, respectively, - 70 and 62dB using the pre-regulator. The proposed BGR circuit generates an output voltage of 0. 5582V with a varia- tion of 1.5mV in a temperature range from 0 to 85℃. The deviation of the output voltage is within 2mV when the power supply voltage VDD changes from 2.4 to 4V.
文摘A new type of dehydration unit for natural gas was briefly described and its basic structure and working principles were presented. An indoor test rig for testing the unit performance was set up and the experimental results were given. The results showed that the unit could attain a maximum dew point depression of about 20℃ without any need of external mechanical power and chemicals. The pressure loss ratio, shock wave and the flow rate had great influence on the dehydration characteristics. From the systematic analysis of the factors that affect the dehydration efficiency of the unit, the suggestions for improving the unit are put forward.
文摘China is one of the countries most severely suffering from tropical cyclones. The exact and timely forecasting and warning is of significant importance in fighting against tropical cyclones and mitigating their impacts on China. The numerical weather prediction （NWP） system for tropical cyclone rainfall and strong wind is going to play a more and more important role. There is also a need for timely and user friendly modem warning services in order to provide the governments and relevant authorities at all levels and general public with typhoon forecasts and information about the associated disasters and response strategy services.
