齿轮跳动检查仪电动测量的改造

采用Inventor三维设计软件,对仪器新增机构进行了三维建模设计、模拟装配、多方案比较选优等工作。采用TWX小型位移差动式传感器采集被测信号,经AD7705进行模数转换;计算机与单片机和机械部分控制的实现,以及测量结果的显示、输出均采用的是"组态王"软件。改造后的仪器,对测量技术教学有较好的示范作用。学生们可以较为直观地了解检测系统信号拾取、信号处理、显示记录等各构成部分的主要内容。     

喷涂式上浆机烘箱的结构革新探索

对喷涂式上浆机烘箱的技术革新作了详细的阐述,该机的重要组件——烘箱设计采用远红外与热风混合加热的方式、各温区形成封闭小循环系统等几种特殊措施,使烘箱控温精度和横断面温差均控制在±3％之内,从而保证了透气防毒服对整机的工艺要求。     

利用遥感手段判识沙尘暴的一种新方法——以内蒙古地区为例

利用比辐射率的特征,并根据热辐射理论进行沙尘暴遥感监测是一种全新的研究手段.本文发现,沙尘发生时地表的主要物质沙尘、地面和云的物质性质不同,并且沙尘强度不同时图像像元上的地面和沙尘的比例不同,从而导致像元物质的性质有差别,地物比辐射率不相同.通过理论推导和试验研究得出:云区、地面、弱沙尘和强沙尘区的ε29与ε31接近程度不同,且ε31在0-1整个区间上变化时,ε29的大小顺序永远是云>强沙>弱沙>地面,并在此基础上建立了一个稳定判识沙尘强度的沙尘指数(DSI)模型.经过多次沙尘暴的实例验证,结果表明,该模型能够较精确地监测沙尘发生的范围和强度.     

开设综合性、设计性实验的探索与实践

实验是化学的灵魂,是化学的魅力和激发学生学习兴趣的重要源泉,更是培养学生和发展学生思维能力和创新能力的重要方法和手段,设计型实验对学生的综合能力能进一步体现,激发学生学习的积极性。     

电子式电能表中滤波器的设计

电能计量是电力交易结算的基础,计量的准确性至关重要。电子式电能表虽然已得到广泛应用,但在谐波分量大、含有大型动态冲击负荷的情况下,其计量的准确性会受到影响。因此,在经典电子式电能表计量算法的基础上,提出了一种基于数字滤波器的改进方法,利用Matlab中FDA Tool功能,设计了相应的数字滤波器用于提高电能计量的精度。仿真结果表明,在有谐波和动态负荷情况下,该方法可使有功电能、基波电能的计量误差控制在±1%范围内,验证了该方法的有效性。     

酵母菌对重金属的吸附与抗性和解毒重金属的胞内分子机制研究进展

利用有益的酵母菌去除食品基质、动物及人体的重金属污染是近年的研究热点。本文概述了多种酵母菌吸附及抗重金属的情况,并对酵母菌在重金属胁迫下的胞内解毒机制进行分析,包括谷胱甘肽合成的解毒机制、与酵母菌解毒重金属相关的基因和蛋白、转运蛋白介导的细胞内重金属的排出和液泡隔离机制及金属硫蛋白和植物螯合肽对重金属的螯合作用,重点从分子角度分析了酵母菌对重金属的解毒机制,归纳了解毒过程中关键性的基因和蛋白质以及它们的功能作用,旨在为酵母菌作为生物吸附剂应用于生态环境、被重金属污染的发酵食品及动物和人体提供依据。     

Graphene oxide guiding the constructing of nickel-iron layered double hydroxides arrays as a desirable bifunctional electrocatalyst for HER and OER

It is accepted that the electrocatalytic activity is correlated to the morphology. Here, graphene oxide guiding nickel and iron layered double hydroxides hybrid arrays (GO-FeNi-LDH) are firstly fabricated by one-step electro-deposition method. The pretty 3D arrays with sheets vertically growing on nickel foam (NF) are highlighted by controlling the quantity of GO. Furthermore, the electron transfer from Ni, Fe to graphene is detected, making the metals and graphene in high valence and electron-rich state, respectively. The optimal GO-FeNi-LDH presents pretty morphology, defects, electron interactions and good conductivity. Therefore, to achieve 10 and 100 mA cm⁻², it requires the overpotentials of 119, 210, 285 and 303 mV for HER and OER and excellent durability. Noticeably, the optimal GO-NiFe-LDH needs a cell voltage of 1.48 V to drive 10 mA cm⁻² for the whole water splitting, which are lower than that of most of advanced electrocatalysts, endowing it in first-rank electrocatalyst.     

Nickel and manganese co-modified K/MoS2 catalyst: high performance for higher alcohols synthesis from CO hydrogenation

Mn and Ni co-modified K/MoS₂ catalyst for higher alcohols synthesis from syngas was prepared by co-precipitation, and its performance in CO hydrogenation was tested. The results indicated a synergistic effect between Mn and Ni on co-modified K/MoS₂ catalyst, which led to high performance for higher alcohols synthesis.     

Boosting discharge capability of α-Ni(OH)2 by cobalt doping based on robust spherical structure

α-Ni(OH)₂ is a promising candidate of the currently commercialized β-Ni(OH)₂ due to its higher theoretical discharge capacity in alkaline solution; however, its instability and poor conductivity plague the practical application. Herein, we propose α-Ni(OH)₂ with Co doping and spherical structure to strengthen the stability and enhance the conductivity and use it as the cathode for nickel-metal hydride batteries. Studies show that proper Co doping promotes the electrochemical reaction between the active materials and the electrolyte due to the spherical α-Ni(OH)₂ with enlarged interlayer distance and abundant hole channels, as well as high conductivity of Co, therefore, the obtained spherical α-Ni(OH)₂ with 7 mol% Co doping delivers significantly improved discharge capability, which is 384.6 mAh g^?1 at 70 mA g^?1 (0.2 C), increased by 54.3 mAh g^?1 compared with pure α-Ni(OH)₂, and at a high current of 5 C, it still gives 269.4 mAh g^?1, in contrast 218.5 mA g^?1 for the pure α-Ni(OH)₂. Besides, the cycling stability of the α-Ni(OH)₂ with 7 mol% Co doping maintains 340 cycles at a capacity retention of 80% (1C), which is extended 110 cycles in contrast to the pure α-Ni(OH)₂. These results provide the underpinning platform of α-Ni(OH)₂ for battery applications with high discharge ability and cycle life.