We report a low power ASK IF receiver for short-range wireless systems,which includes an AGC loop that compensates the channel attenuation and an ASK detector. A novel current-limited transconductor and feed-forward d...We report a low power ASK IF receiver for short-range wireless systems,which includes an AGC loop that compensates the channel attenuation and an ASK detector. A novel current-limited transconductor and feed-forward differential peak detector have been designed to maintain a high compression ratio and fast response for the AGC with lower power consumption. A storage unit with a zero and a feed-forward structure have been introduced into the peak detector to control the damping characteristic of the AGC loop. A rectifier and low-pass filter included in the ASK detector have been integrated into a more compact structure to further lower the power consumption. The simulation results show the feasibility of the proposed technique.展开更多
This thesis aims at investigating what the discourse patterns are in the asking-for-leave notes written by Chinese students and native English speakers respectively and what excuses are given by Chinese students and n...This thesis aims at investigating what the discourse patterns are in the asking-for-leave notes written by Chinese students and native English speakers respectively and what excuses are given by Chinese students and native English speakers.Role play and retrospective interview were employed as research methords.The results show that the Chinese students all use an inductive pattern,while all native English speakers write the note in a deductive way.Besides,the excuses presented by the two kinds of subjects are different due to their different cultural background.展开更多
目的通过检测ASK1和PRKCD在单核细胞分化过程中的表达变化,探索其在门静脉高压症(PH)脾亢脾脏巨噬细胞(MΦ)功能变化中所起的作用。方法采用佛波酯诱导U937分化成为巨噬细胞样细胞,q-PCR检测不同分化阶段ASK1和PRKCD m RNA的表达,Wester...目的通过检测ASK1和PRKCD在单核细胞分化过程中的表达变化,探索其在门静脉高压症(PH)脾亢脾脏巨噬细胞(MΦ)功能变化中所起的作用。方法采用佛波酯诱导U937分化成为巨噬细胞样细胞,q-PCR检测不同分化阶段ASK1和PRKCD m RNA的表达,Western Blot检测诱导前后ASK1和PRKCD蛋白表达水平变化,ELISA法检测细胞分化过程中与吞噬功能相关的细胞因子IL-10和TNF-α的分泌情况,鸡红细胞吞噬试验鉴定诱导后细胞功能。结果随着PMA诱导U937细胞时间延长,ASK1和PRKCD基因表达水平下降,TNF-α的分泌量逐渐增加,而IL-10在诱导后24 h达到最大分泌量,随后又呈下降趋势;Western Blot结果显示,ASK1及p-ASK1蛋白表达水平较诱导前均显著上升,PRKCD及p-PRKCD蛋白表达水平显著下降;吞噬实验结果显示,诱导后的细胞具有一定的吞噬功能。结论在PMA诱导的U937细胞向单核细胞分化过程中,ASK1蛋白表达上调,PRKCD蛋白表达下调,与脾亢脾Mφ一致,并导致Mφ活性增强。展开更多
文摘We report a low power ASK IF receiver for short-range wireless systems,which includes an AGC loop that compensates the channel attenuation and an ASK detector. A novel current-limited transconductor and feed-forward differential peak detector have been designed to maintain a high compression ratio and fast response for the AGC with lower power consumption. A storage unit with a zero and a feed-forward structure have been introduced into the peak detector to control the damping characteristic of the AGC loop. A rectifier and low-pass filter included in the ASK detector have been integrated into a more compact structure to further lower the power consumption. The simulation results show the feasibility of the proposed technique.
文摘This thesis aims at investigating what the discourse patterns are in the asking-for-leave notes written by Chinese students and native English speakers respectively and what excuses are given by Chinese students and native English speakers.Role play and retrospective interview were employed as research methords.The results show that the Chinese students all use an inductive pattern,while all native English speakers write the note in a deductive way.Besides,the excuses presented by the two kinds of subjects are different due to their different cultural background.
