摘要：With increasing industrial activities,mercury has been largely discharged into environment and caused serious environmental *** growing level of mercury pollution has become a huge threat to human health due to its significant ***,the simple and fast means for on-site monitoring discharged mercury pollution are highly necessary to protect human beings from its pernicious effects in ***,a"turn off"fluorescent biosensor(mCherry L199 C)for sensing Hg2+was successfully designed based on direct modification of the chromophore environment of fluorescent protein *** rapid screening and characterization,the designed variant of mCherry(mCherry L199 C)was directly expressed on outer-membrane of Escherichia coli cells by cell surface display *** fluorescent biosensor was characterized to have favorable response to Hg2+at micromole level among other metal ions and over a broad pH ***,the cells of the fluorescent biosensor were encapsulated in alginate hydrogel to develop the cells-alginate hydrogel-based *** cells-alginate hydrogel-based paper could detect mercury pollution in 5 min with simple operation process and inexpensive equipment,and it could keep fluorescence and activity stable at 4℃ for 24 hr,which would be a high-throughput screening tool in preliminarily reporting the presence of mercury pollution in natural setting.

摘要：针对独播和联播两种网络视频产业链结构,考虑消费者的餍足效应,研究了内容商、广告商和视频平台关于内容分成单价、广告植入量和会员费的互动决策,分析了餍足效应的影响。结果表明,当消费者餍足效应增大时,内容商越倾向于采取广告排斥型分成单价,各主体的均衡决策和均衡利润都减少,且两种播放模式下的内容分成单价、广告植入量、视频总播放量、内容商利润、广告商利润和消费者剩余的差异都减小,但联播模式下在位平台的利润越可能比独播模式下的高。此外,忽视餍足效应将导致视频播放量、消费者剩余、广告商利润和平台利润降低,但内容商利润有可能增加。

摘要：从网络结构角度出发,设计以聚乙二醇单甲醚(mPEG)与甲苯2,4-二异氰酸酯(TDI)反应所制得预聚体为悬挂链,聚酯二元醇和TDI反应制得预聚体为弹性链,超支化H201作为交联扩链剂制备无规网络结构的聚氨酯弹性体。采用动态力学分析仪、原子力显微镜以及正电子湮没寿命谱等表征其结构与性能,从自由体积、微相分离、氢键作用等结构与性能之间的关系深入探讨聚氨酯宽温域高阻尼机理。研究结果表明,随着悬挂链含量增加,R值(n(-NCO)/n(-OH))减小,聚氨酯的微相分离程度降低,相容性增加,氢键作用增强,自由体积增大,聚氨酯的有效阻尼(tanδ≥0.3)温域可达175℃(-60~115℃),为一种基于网络结构设计的新型聚氨酯阻尼材料。

摘要：The electrolysis of water powered by renewable energy sources offers a promising method of"green hydrogen"production,which is considered to be at the heart of future carbon-neutral energy *** the past decades,researchers have reported a number of hydrogen evolution reaction(HER)electrocatalysts with activity comparable to that of commercial Pt/C,but most of them are tested within a small current density range,typically no more than 500 mA cm^(-2).To realize the industrial application of hydrogen production from water electrolysis,it is essential to develop high-efficiency HER electrocatalysts at high current density(HCD≥500 mA cm^(-2)).Nevertheless,it remains challenging and significant to rational design HCD electrocatalysts for *** this paper,the design strategy of HCD electrocatalysts is discussed,and some HCD electrocatalysts for HER are reviewed in seven categories(alloy,metal oxide,metal hydroxide,metal sulfide/selenide,metal nitride,metal phosphide and other derived electrocatalysts).At the end of this article,we also pro-pose some viewpoints and prospects for the future development and research directions of HCD electrocatalysts for HER.

摘要：为实现汽车EPS扭矩信号测量,设计了一种柱式电磁EPS扭矩传感器。该传感器基于涡流效应原理,采用外定子内转子结构,通过测量转角得到扭矩信息。为研究接收线圈感应电压与结构参数的关系,对传感器进行互感耦合分析,并利用磁路分析法及COMSOL仿真计算感应电压。为提高感应电压幅值,以励磁线圈品质因数及电感为优化目标进行理论计算,并针对其结构尺寸设计复合因素仿真试验。通过仿真优化转子与平面励磁线圈耦合间隙,进一步提升感应电压幅值。

摘要：撞击流是一种过程强化形式,因其能产生较大的湍流动能与湍流耗散率而适用于快速反应体系.本文采用粒子图像测速(PIV)技术与碘化物-碘酸盐平行竞争反应,对不等径撞击流反应器内的流动与微观混合特性进行了研究.结果表明,在充分湍动情况下,雷诺数的改变对撞击腔内无因次化的流体平均速度、脉动速度以及湍流动能分布影响不大,微观混合效果随着撞击雷诺数的增加而增强;适宜的上方空间有利于增强传递过程,在较低的上方空间条件下驻点位置的偏移将受到显著影响;在不同动量比条件下,速度/动量比对无因次的驻点位置偏移影响显著,10%的速度/动量比变化将造成35%的驻点偏移量.该不等径撞击流反应器流动特性的研究为该型反应器的设计及优化提供了基础的数据.

摘要：介绍一个涵盖界面化学、物理化学与仪器分析等多学科的基础实验。本实验融合前沿科技成果“液体门控技术”,以自主研发的液体门控教学测试分析仪(压力阈值仪)的设计原理和先进表征技术特性为基础,结合本科生化学“101计划”中的化学测量学实验——液体门控机制及基本性质测定,创新教学模式,丰富化学测量学实验中关于界面科学表征的课程设计。

摘要：针对视频网站(平台)自制内容,分别在CPT(按时长收费)和CPM(按展示次数收费)两种植入广告收费模式下,研究了平台和植入广告商关于植入广告单价、植入广告数量、会员费和贴片广告数量的三阶段博弈,并对两种模式的决策结果进行了比较。结果表明,当植入广告商收益率低于一定阈值时,两种模式下平台都只设置贴片广告,否则,平台在CPT模式下将同时设置植入广告和贴片广告,而在CPM模式下只设置植入广告。比较两种模式发现,当植入广告商收益率较低时,两种模式完全等价;否则,CPM模式下的植入广告单价和数量更高,会员费和贴片广告数量更低,且平台利润和消费者效用更高。植入广告商则在其收益率适中时偏好CPM模式,在其收益率较高时偏好CPT模式。

摘要：剪切屈服应力是反映磁流变液流变特性的主要参数之一,稳定可控的磁场直接影响磁流变液剪切屈服应力的测量精度,因此磁场设计是否合理对磁流变液的流变性能测试具有重要的影响。针对外置式线圈产生的磁场强度较低且存在漏磁现象、对称式线圈中磁流变液装载不便导致测量过程持续性差等问题,设计了一种凹字型磁路,通过调整线圈位置来改变磁场结构,使磁力线垂直穿过磁流变液流动方向,同时可拆卸的组合式磁路设计在保证磁场强度需要的前提下实现了磁流变液的连续性测量。此外,还分析了不同电流下的磁场强度分布规律,并基于优化的磁路开展了磁流变液剪切屈服应力等力学性能参数的测试。与主流标准测试仪器相比,具有凹字型磁路结构的磁流变液测试系统所测得的剪切屈服应力平均相对偏差值约为10%,重复误差在6.34%以内,说明该磁路结构是磁流变测试中磁场装置设计的一种可行方法。

摘要：设计了一种可定制功能的温室用悬挂式自动喷灌系统,进行了基于触摸屏、可编程控制器、步进电机的开放式温室自动喷灌系统的软硬件设计,该系统具有系统功能可定制、喷灌参数可设置等特点。