Nickel-Carnosine complex:A new carrier for enzymes immobilization by affinity adsorption

Immobilization is an effective method to promote the application of enzyme industry for improving the stability and realizing recovery of enzyme.To some extent,the performance of immobilized enzyme depends on the choice of carrier material.Therefore,the development of new carrier materials has been one of the key issues concerned by enzyme immobilization researchers.In this work,a novel organic-inorganic hybrid material,nickel-carnosine complex (NiCar),was synthesized for the first time by solvothermal method.The obtained NiCar exhibits spherical morphology,hierarchical porosity and abun-dant unsaturated coordination nickel ions,which provide excellent anchoring sites for the immobiliza-tion of proteins.His-tagged organophosphate-degrading enzyme (OpdA) and ω-transaminase (ω-TA)were used as model enzymes to evaluate the performance of NiCar as a carrier.By a simple adsorption process,the enzyme molecules can be fixed on the particles of NiCar,and the stability and reusability are significantly improved.The analysis of protein adsorption on NiCar verified that the affinity adsorp-tion between the imidazole functional group on the protein and the unsaturated coordination nickel ions on NiCar was the main force in the immobilization process,which provided an idea way for the develop-ment of new enzyme immobilization carriers.     

Technology for recycling and regenerating graphite from spent lithium-ion batteries

With the annual increase in the amount of lithium-ion batteries (LIBs), the development of spent LIBs recycling technology has gradually attracted attention. Graphite is one of the most critical materials for LIBs, which is listed as a key energy source by many developed countries. However, it was neglected in spent LIBs recycling, leading to pollution of the environment and waste of resources. In this paper, the latest research progress for recycling of graphite from spent LIBs was summarized. Especially, the processes of pretreatment, graphite enrichment and purification, and materials regeneration for graphite recovery are introduced in details. Finally, the problems and opportunities of graphite recycling are raised.     

A panoramic view of Li7P3S11 solid electrolytes synthesis,structural aspects and practical challenges for all-solid-state lithium batteries

The development of an inorganic electrochemical stable solid-state electrolyte is essentially responsible for future state-of-the-art all-solid-state lithium batteries (ASSLBs). Because of their advantages in safety, working temperature, high energy density, and packaging, ASSLBs can develop an ideal energy storage system for modern electric vehicles (EVs). A solid electrolyte (SE) model must have an economical synthesis approach, exhibit electrochemical and chemical stability, high ionic conductivity, and low interfacial resistance. Owing to its highest conductivity of 17 mS·cm^-1, and deformability, the sulfide-based Li₇P₃S₁₁ solid electrolyte is a promising contender for the high-performance bulk type of ASSLBs. Herein, we present a current glimpse of the progress of synthetic procedures, structural aspects, and ionic conductivity improvement strategies. Structural elucidation and mechanistic approaches have been extensively discussed by using various characterization techniques. The chemical stability of Li₇P₃S₁₁ could be enhanced via oxide doping, and hard and soft acid/base (HSAB) concepts are also discussed. The issues to be undertaken for designing the ideal solid electrolytes, interfacial challenges, and high energy density have been discoursed. This review aims to provide a bird's eye view of the recent development of Li₇P₃S₁₁-based solid-state electrolyte applications and explore the strategies for designing new solid electrolytes with a target-oriented approach to enhance the efficiency of high energy density all-solid-state lithium batteries.     

高海拔变电站蓄电池及UPS容量选择及修正

高海拔地区环境温度、空气密度及气压低,在选择变电站站用蓄电池及UPS容量时应进行必要的修正,以满足变电站的用电需求。结合阿里与藏中联网工程的某500 k V变电站项目,对高海拔变电站蓄电池及UPS容量选择进行了探讨分析,希望能为类似工程提供参考。     

高土壤电阻率变电站降阻措施分析及降阻目标选择

采用接地系统辅助设计软件包CDEGS,结合工程实例对局部换土、深井接地、引外接地和敷设接地极(接地模块或离子接地棒) 4种高土壤电阻率变电站常用降阻措施进行了仿真计算。基于计算结果分析了每种降阻措施的降阻特性,并提出了工程应用建议。此外,在确保人身和设备安全前提下,探讨了如何合理选择降阻目标避免过度设计。     

基于多分量融合的调度端小电流接地选线策略

针对中性点不接地的配电系统站端接地选线方式投资大、维护成本高,零序电流采样监测运行维护困难的问题,提出一种基于多分量融合的调度端小电流接地选线方法。首先,在现有调度自动化系统监测数据集中,针对性分析了对接地故障较为敏感的单分量特征及其影响因素;其次,综合考虑实际运行可靠性和判断准确性,提出了基于三角模融合的接地选线判据;进而通过归一化计算各线路接地概率,实现在调度端远程的故障线路准确选线;最后,通过在某电力公司实际部署基于所提方法的小电流接地选线功能模块进行实测验证。运行结果显示,所提方法具有良好的选线成功率,能够较好支撑调度端的远程故障定位,具有较高的推广价值。     

覆膜滤料用聚四氟乙烯微孔膜的制备及其性能研究

针对市场上常用4种SSG范围的聚四氟乙烯(polytetrafluoroethylene,简称PTFE)树脂原料,采用双向拉伸法制备PTFE微孔膜,分析微孔膜性能的差异,并确定最适用于覆膜滤料用PTFE树脂原料.分析了不同分子量PTFE树脂原料的相对标准密度(SSG)、粒径、挤出压力和含水率等参数,采用不同分子量树脂原料来制备PTFE微孔膜,并表征PTFE微孔膜力学、厚度、结晶度、孔径、孔隙率和透气性能.研究表明:SSG的大小会影响PTFE微孔膜的力学性能(最大力、断裂伸长率)和孔结构(孔径、孔隙率),随SSG的增大呈现先上升后下降的趋势,在2.170～2.189范围内达到最优;结晶度与SSG的大小成正相关,而微孔膜透气性能主要与其孔结构有关,与孔径和孔隙率的变化趋势具有一致性.得出结论:PTFE树脂原料SSG分布在2.170～2.189范围时,制备的PTFE微孔膜最适用于覆膜滤料领域.     

高压输电线路避雷器安装与更换带电作业自动化技术研究

提出了针对高压输电线路避雷器安装与更换带电作业的自动化技术及其自动化工具.该技术通过两个协同作业的操作手爪完成避雷器的安装和更换.对该自动化工具进行静力学仿真,讨论了其绝缘措施.     

镀膜玻璃研究进展

镀膜玻璃作为一种深加工玻璃,是建筑领域不可或缺的材料之一.通过对镀膜玻璃的性能、分类以及制备方法进行阐述,对镀膜玻璃的传热系数、遮蔽系数和太阳能总透射比进行分析,对磁控溅射法、化学气相沉积法、喷雾热解法和溶胶-凝胶法等制备技术进行分析讨论,为镀膜玻璃的应用发展提供应用基础和先决条件.     

两台互为备用泵的自动切换控制系统

一用一备的两台锅炉给水泵互为备用,自动切换运行,实现了锅炉供水的不间断,也避免了一台水泵长期运行产生机械疲劳.