Aqueous zinc metal batteries(ZMBs)which are environmentally benign and cheap can be used for grid-scale energy storage,but have a short cycling life mainly due to the poor reversibility of zinc metal anodes in mild aq...Aqueous zinc metal batteries(ZMBs)which are environmentally benign and cheap can be used for grid-scale energy storage,but have a short cycling life mainly due to the poor reversibility of zinc metal anodes in mild aqueous electrolytes.A zincophilic carbon(ZC)layer was deposited on a Zn metal foil at 450°C by the up-stream pyrolysis of a hydrogen-bonded supramolecular substance framework,as-sembled from melamine(ME)and cyanuric acid(CA).The zincophilic groups(C=O and C=N)in the ZC layer guide uniform zinc plating/stripping and eliminate dendrites and side reactions.so that assembled symmetrical batteries(ZC@Zn//ZC@Zn)have a long-term service life of 2500 h at 1 mA cm^(−2) and 1 mAh cm^(−2),which is much longer than that of bare Zn anodes(180 h).In addition,ZC@Zn//V2O5 full batteries have a higher capacity of 174 mAh g^(−1) after 1200 cycles at 2 A g^(−1) than a Zn//V_(2)O_(5) counterpart(100 mAh g^(−1)).The strategy developed for the low-temperat-ure deposition of the ZC layer is a new way to construct advanced zinc metal anodes for ZMBs.展开更多
针对市场上的刚性健康监测设备无法贴合皮肤、降低了监测精度以及影响穿戴舒适性等问题,设计了一种基于聚偏氟乙烯(Polyvinylidene Fluoride,PVDF)柔性压电传感器的体征监测系统,以床垫作为载体放置在睡姿胸部正下方,利用高精度传感器...针对市场上的刚性健康监测设备无法贴合皮肤、降低了监测精度以及影响穿戴舒适性等问题,设计了一种基于聚偏氟乙烯(Polyvinylidene Fluoride,PVDF)柔性压电传感器的体征监测系统,以床垫作为载体放置在睡姿胸部正下方,利用高精度传感器及数据处理算法实时监测人体心率和呼吸率。系统以STM32F103为采集通信模块、Purple Pi RK3566为数据处理模块,通过EMD-FFT算法进行实时处理,通过SPI协议实现设备之间的通信。仿真及实测结果表明,该方案抗干扰性好,低频响应好且准确度高,可实现不同场景中体征的实时监测,为提高生活健康质量和生命健康指数提供有效支撑。展开更多
基金partially supported by the National Natural Science Foundation of China(22479022)Liaoning Revitalization Talents Program(XLYC2007129)。
文摘Aqueous zinc metal batteries(ZMBs)which are environmentally benign and cheap can be used for grid-scale energy storage,but have a short cycling life mainly due to the poor reversibility of zinc metal anodes in mild aqueous electrolytes.A zincophilic carbon(ZC)layer was deposited on a Zn metal foil at 450°C by the up-stream pyrolysis of a hydrogen-bonded supramolecular substance framework,as-sembled from melamine(ME)and cyanuric acid(CA).The zincophilic groups(C=O and C=N)in the ZC layer guide uniform zinc plating/stripping and eliminate dendrites and side reactions.so that assembled symmetrical batteries(ZC@Zn//ZC@Zn)have a long-term service life of 2500 h at 1 mA cm^(−2) and 1 mAh cm^(−2),which is much longer than that of bare Zn anodes(180 h).In addition,ZC@Zn//V2O5 full batteries have a higher capacity of 174 mAh g^(−1) after 1200 cycles at 2 A g^(−1) than a Zn//V_(2)O_(5) counterpart(100 mAh g^(−1)).The strategy developed for the low-temperat-ure deposition of the ZC layer is a new way to construct advanced zinc metal anodes for ZMBs.
文摘为揭示外源脱落酸(Abscisic acid,ABA)对祁连山野生药食植物黄参(Sphallerocarpus gracilis)肉质根中代谢物积累模式的影响,本研究采用超高效液相系统和UPLC-电喷雾(Electron spray ionization,ESI)-三重四极杆线性离子阱(Triple quadrupole-linear ion trap,QTRAP)-MS/MS的广泛靶向代谢组学技术,探究了施用20μg·L^(-1)ABA和2000 mg·L^(-1)ABA抑制剂钨酸钠时根中代谢物的变化。本研究首次从黄参肉质根中鉴定出两种类胡萝卜素,分别为β-胡萝卜素和叶黄素;共得到7类537种差异代谢物,其中莽草酸及苯丙酸类(206种)、萜类(93种)、生物碱(92种)和氨基酸及短肽(84种)占比较高;京都基因与基因组百科全书(Kyoto encyclopedia of genes and genomes,KEGG)数据库通路富集分析表明,差异代谢物分布在5大类15条代谢途径中,主要富集在苯丙氨酸代谢、硫胺素代谢和酪氨酸代谢等通路。综上所述,外源ABA及其抑制剂会影响黄参肉质根代谢模式,ABA有望用于开发关键代谢通路的靶向调控剂。
文摘针对市场上的刚性健康监测设备无法贴合皮肤、降低了监测精度以及影响穿戴舒适性等问题,设计了一种基于聚偏氟乙烯(Polyvinylidene Fluoride,PVDF)柔性压电传感器的体征监测系统,以床垫作为载体放置在睡姿胸部正下方,利用高精度传感器及数据处理算法实时监测人体心率和呼吸率。系统以STM32F103为采集通信模块、Purple Pi RK3566为数据处理模块,通过EMD-FFT算法进行实时处理,通过SPI协议实现设备之间的通信。仿真及实测结果表明,该方案抗干扰性好,低频响应好且准确度高,可实现不同场景中体征的实时监测,为提高生活健康质量和生命健康指数提供有效支撑。
