摘要：开发了一种便携式植物叶绿素无损检测仪器,该仪器可实现对叶绿素浓度的实时、快速、无损检测。仪器主要包括4个部分:叶片夹具,光源驱动电路,光电检测及信号调理电路和微控制系统。提出了一种电流可调节的光源恒流驱动电路方案,在实现恒流驱动的同时还可以对驱动电流进行程控。同时提出了一种一体化叶片夹具设计方案,不仅简化了仪器的光学结构,而且提高了仪器稳定性。在仪器的标定实验中,用SPAD-502叶绿素测量仪测定的叶片叶绿素含量SPAD值作为标准值,建立了多元线性标定模型,对仪器的性能进行了评价,叶绿素预测值与标准值的相关系数为0.97,预测均方根误差为1.3SPAD,仪器重复性的均方根误差为0.1SPAD。标定实验结果表明,该仪器测量精度高、性能稳定。

摘要：This vertically self‐pillared(VSP)structure extends the application range of traditional porous materials with facile mass/ion transport and enhanced reaction ***,we prepare a single crystal metal‐organic framework(MOF),employing the ZIF‐67 structure as a proof of concept,which is constructed by vertically self‐pillared nanosheets(VSP‐MOF).We further converted VSP‐MOF into VSP‐cobalt sulfide(VSP‐CoS2)through a sulfidation *** plays an important role in almost all battery technologies;for metallic batteries,lithium anodes exhibit a high theoretical specific capacity,low density,and low redox ***,during the half‐cell reaction(Li++e=Li),uncontrolled dendritic Li penetrates the separator and solid electrolyte interphase *** employed as a composite scaffold for lithium metal deposition,there are many advantage to using this framework:1)the VSP‐CoS2 substrate provides a high specific surface area to dissipate the ion flux and mass transfer and acts as a pre‐catalyst,2)the catalytic Co center favors the charge transfer process and preferentially binds the Li+with the enhanced electrical fields,and 3)the VSP structure guides the metallic propagation along the nanosheet 2D orientation without the protrusive *** these features enable the VSP structure in metallic batteries with encouraging performances.

摘要：为了解决沥青路面预防性养护技术中抗滑性、耐久性不足的问题,提出了一种新型高性能冷铺薄层罩面技术。同时采用McLeod方法确定了集料撒布量,采用湿轮磨耗试验和负荷轮黏砂试验确定了乳化沥青的最佳涂布量,参照渗水系数确定了纳米封面剂的酒布量,并对高性能冷铺薄层罩面混合料的早期强度、层间粘结强度、抗滑性和耐久性进行了研究。