摘要：Aqueous supercapacitors(SCs)exhibit several advantages,including high-power density,cycling durability,and safety;however,the shortage of low energy density inhibits their further *** an excellent performance upon using simple strategies would be beneficial,but remains ***,an integrated electrode of hollow V_(2)O_(3)/carbon nanospheres(H-V_(2)O_(3)/C)was designed and synthesized for *** introduction of carbon can increase the conductivity and stability,whereas the hollow structure endows H-V_(2)O_(3)/C with a high specific surface area and rapid transport of ***,the H-V_(2)O_(3)/C integrated electrode can simultaneously work in both negative and positive potential *** from these advantages,the H-V_(2)O_(3)/C integrated electrode exhibits a specific capacitance as high as 708.6 F g^(-1) in a wide voltage window of-1.1-1.3 ***,stemming from the multiple energy storage mechanisms,the aqueous integrated full SC device exhibits a wider potential window and higher energy density than the traditional(a)symmetric ***,the proposed device delivers a wide voltage window of 2.4 V with an energy density of 96.8 W h kg^(-1) at a power density of 1204.6 W kg^(-1),as well as superior cycling *** study enlightens the design and preparation of electrode materials,opening up a possible approach for developing wide-voltage aqueous SCs.

摘要：项目式学习在高中化学教学中的应用,尤其是在“电解池”实验教学中的应用,具有重要的研究价值。本文通过设计和实施基于电解池原理的项目式学习活动,可以有效提高学生的化学实验技能、科学探究能力和学习兴趣。实践表明,项目式学习能够促进学生对电解原理的深入理解,培养其实验设计和操作能力,同时提升学生的团队协作能力和批判性思维。

摘要：针对目前冷链物流运输过程中食品和车辆的安全问题及实时性,设计一种基于STM32的车载监测系统。利用RFID技术、北斗技术及传感器采集车厢内温湿度信息及车辆行驶状态,并根据容许函数阈值和分批估计加权自适应融合算法得出某一时间段的最优估计值;同时,通过驾驶室的串口屏对采集到的信息进行显示;最后将采集到的信息通过3G通信技术发送至远端服务器对数据进行保存和分析。试运行结果表明,该系统能实时地监测运输车在行驶过程中的车厢环境和车辆行驶状态。

摘要：随着物联网技术的不断发展,传统的农业病虫害监测预警方式正逐步被改变。物联网技术在农业病虫害监测预警中的作用越来越重要。文中对物联网的内涵进行了概述,然后根据物联网的关键技术之一——传感器网络技术,构建了基于物联网技术的农田环境监测系统体系结构,并在此基础上,提出了基于物联网技术的蓝莓病虫害监测预警系统的构想。

摘要：针对农田环境的特点并结合数据传输存在的问题,提出了一种基于GPRS无线通信技术和Web技术的农田环境监测系统。该系统首先以MSP430单片机为控制器构成农田终端,实现对农田信息的采集与处理;然后由单片机控制GPRS模块将数据通过GPRS网络和Internet传送到监测中心的服务器。用户可通过互联网实时、远程地查询各种信息。本系统重点研究了数据的远程传输和农田信息的使用与共享。通过实验表明,本系统运行稳定,可实时采集、传输、显示农田的环境数据。