这份报纸针对气体在小、中型的煤矿引起的灾难的实际条件。为煤矿监视系统的新煤气的集中根据煤气察觉到的察觉和单个薄片的控制被开发。因为它为易燃、爆炸的气体有好敏感特征，监视系统把锡氧化物用作 N 类型半导体气体传感器的主要材...这份报纸针对气体在小、中型的煤矿引起的灾难的实际条件。为煤矿监视系统的新煤气的集中根据煤气察觉到的察觉和单个薄片的控制被开发。因为它为易燃、爆炸的气体有好敏感特征，监视系统把锡氧化物用作 N 类型半导体气体传感器的主要材料(例如甲烷，碳一氧化物) 。QM-N5-semiconductor 煤气的传感器被采用在不同煤气的集中下面检测抵抗的产量价值。故意地，系统拿数字薄片抵抗作为处理硬件结构分析并且判定输入的电路的核心珍视的 AT89C51，然后为超出煤气的集中的限制完成控制和警报。监视系统的煤气的集中有许多优点包括在结构，快反应时间，稳定的表演和低费用简单。因此，监视煤气的集中并且在小、中型的煤矿提供早警告能广泛地被用来。展开更多
Experiments are used to study the fabrication of polymer microfluidic chip with hot embossing method. The pattern fidelity with respect to the process parameters is analyzed. Experiment results show that the relations...Experiments are used to study the fabrication of polymer microfluidic chip with hot embossing method. The pattern fidelity with respect to the process parameters is analyzed. Experiment results show that the relationship between the imprint temperature and the microchannel width is approximately exponential. However, the depth of micro channel isn＇t sensitive to the imprint temperature. When the imprint pressure is larger than 1 MPa and the imprint time is longer than 2 min, the increasing of imprint pressure and holding time has little impact on the microchannel width. So over long holding time is not needed in hot embossing. Based on the experiment analysis, a series of optimization process parameters is obtained and a fine microfluidic chip is fabricated. The electrophoresis separation experiment are used to verify the microfluidic chip performance after bonding. The results show that 100bp-ladder DNA sample can be separated in less than 5 min successfully.展开更多
采用7级子ADC流水线结构设计了一个8位80 Msample/s的低功耗模数转换电路。为减小整个ADC的芯片面积和功耗,改善其谐波失真和噪声特性,重点考虑了第1级子ADC中MDAC的设计,将整个ADC的采样保持电路集成在第1级子ADC的MDAC中,并且采用逐...采用7级子ADC流水线结构设计了一个8位80 Msample/s的低功耗模数转换电路。为减小整个ADC的芯片面积和功耗,改善其谐波失真和噪声特性,重点考虑了第1级子ADC中MDAC的设计,将整个ADC的采样保持电路集成在第1级子ADC的MDAC中,并且采用逐级缩放技术设计7级子ADC的电路结构,在版图设计中考虑每一级子ADC中的电容及放大器的对称性。采用0.18μm CMOS工艺,该ADC的信噪比(SNR)为49.5 d B,有效位数(ENOB)为7.98位,该ADC的芯片面积只有0.56 mm2,典型的功耗电流仅为22 m A。整个ADC性能达到设计要求。展开更多
基金supported by the program of Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Provincethe Hunan Province and Xiangtan City Natural Science Joint Foundation(No.09JJ8005)+1 种基金the Industrial Cultivation Program of Scientific and Technological Achievements in Higher Educational Institutions of Hunan Province(No.10CY008)the Technologies R & D of Hunan Province (No.2010CK3031)
文摘这份报纸针对气体在小、中型的煤矿引起的灾难的实际条件。为煤矿监视系统的新煤气的集中根据煤气察觉到的察觉和单个薄片的控制被开发。因为它为易燃、爆炸的气体有好敏感特征，监视系统把锡氧化物用作 N 类型半导体气体传感器的主要材料(例如甲烷，碳一氧化物) 。QM-N5-semiconductor 煤气的传感器被采用在不同煤气的集中下面检测抵抗的产量价值。故意地，系统拿数字薄片抵抗作为处理硬件结构分析并且判定输入的电路的核心珍视的 AT89C51，然后为超出煤气的集中的限制完成控制和警报。监视系统的煤气的集中有许多优点包括在结构，快反应时间，稳定的表演和低费用简单。因此，监视煤气的集中并且在小、中型的煤矿提供早警告能广泛地被用来。
基金National Hi-tech Research Development Program of China(863 Program,No.2002AA421150)Research Foundation of Doctorial Project of Ministry of Education,China(No.20030335091)
文摘Experiments are used to study the fabrication of polymer microfluidic chip with hot embossing method. The pattern fidelity with respect to the process parameters is analyzed. Experiment results show that the relationship between the imprint temperature and the microchannel width is approximately exponential. However, the depth of micro channel isn＇t sensitive to the imprint temperature. When the imprint pressure is larger than 1 MPa and the imprint time is longer than 2 min, the increasing of imprint pressure and holding time has little impact on the microchannel width. So over long holding time is not needed in hot embossing. Based on the experiment analysis, a series of optimization process parameters is obtained and a fine microfluidic chip is fabricated. The electrophoresis separation experiment are used to verify the microfluidic chip performance after bonding. The results show that 100bp-ladder DNA sample can be separated in less than 5 min successfully.
文摘采用7级子ADC流水线结构设计了一个8位80 Msample/s的低功耗模数转换电路。为减小整个ADC的芯片面积和功耗,改善其谐波失真和噪声特性,重点考虑了第1级子ADC中MDAC的设计,将整个ADC的采样保持电路集成在第1级子ADC的MDAC中,并且采用逐级缩放技术设计7级子ADC的电路结构,在版图设计中考虑每一级子ADC中的电容及放大器的对称性。采用0.18μm CMOS工艺,该ADC的信噪比(SNR)为49.5 d B,有效位数(ENOB)为7.98位,该ADC的芯片面积只有0.56 mm2,典型的功耗电流仅为22 m A。整个ADC性能达到设计要求。
