摘要：该系统设计了一种智能穿戴式脉搏检测系统,该系统使用STC89C51为主控芯片,通过红外光电传感器检测出使用者血液的光信号并经过处理转换成脉搏数据呈现给使用者,快捷方便。同时,使用者还可以使用Android手机通过蓝牙来接收脉搏情况,实现对使用者脉搏的实时监控功能。经过测试,该设计实现了预设功能,很大程度上解决了病患脉搏检测难的问题。

摘要：Selective coupling of methyl radicals to produce C_(2) species(C2H4 and C2H6)is a key challenge for oxidative coupling of methane(OCM).In traditional OCM reaction systems,homogeneous transformation of methyl radicals in O_(2)‐containing gases are uncontrollable,resulting in limited C_(2) selectivity and ***,we demonstrate that methyl radicals generated by La_(2)O_(3)at low reaction temperature can selectively couple on the surface of 5 wt%Na2WO4/SiO_(2).The controllable surface coupling against overoxidation barely changes the activity of La_(2)O_(3)but boosts the C_(2)selectivity by three times and achieves a C_(2)yield as high as 10.9%at bed temperature of only 570℃.Structure‐property studies suggest that Na_(2)WO_(4) nanoclusters are the active sites for methyl radical *** strong CH_(3)·affinity of these sites can even endow some methane combustion catalysts with OCM *** findings of the surface coupling of methyl radicals open a new direction to develop OCM *** bifunctional OCM catalyst system,which composes of a methane activation center and a CH_(3)·coupling center,may deliver promising OCM performance at reaction temperatures below the ignition temperature of C2H6 and C2H4(~600℃)and is therefore more controllable,safer,and certainly more attractive as an actual process.