Surface Modification of Co3O4 Nanosheets to Promote Peroxymonosulfate Activation for Degradation of Atrazine

Catalysis Letters - This study proposed a new facile route to rational creating oxygen-vacancy (Vo)-rich surface of Co3O4 nanosheets by acetic acid leaching. The acid leached Co3O4 nanosheets was...     

The effect of moderate pulsed electric fields on autolysis of Saccharomyces cerevisiae and the amino acid content in autolysates

The effect of moderate pulsed electric fields (MPEF) strength on autolysis of Saccharomyces cerevisiae was evaluated in this study. After exposure to MPEF with intensity of 7 kV cm⁻¹ for 4 ms, the integrity of the cell wall was obviously destroyed and the inactivation of S. cerevisiae reached 99.43%. During the subsequent 42-h autolysis process, the release of free α-amino nitrogen of MPEF-treated cells, as well as extracellular protease activity, was significantly (P < 0.05) higher than that of untreated cells. Moreover, exposure to 7 kV cm⁻¹ led to an increase of the total amino acid of 149.36%. In particular, the content of aspartic acid and glutamic acid which are important umami flavour precursors increased by 232.55% and 209.40%, respectively. These results indicate that MPEF will be an effective method to accelerate autolysis of S. cerevisiae for obtaining high-quality yeast extract as flavour enhancers and nutrition supplements.     

Dandelion-Like Bi2S3/rGO hierarchical microspheres as high-performance anodes for potassium-ion and half/full sodium-ion batteries

Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) have been considered as attractive alternatives for next-generation battery systems, which have promising application potential due to their earth abundance of potassium and sodium, high capacity and suitable working potential, however, the design and application of bi-functional high-performance anode still remain a great challenge up to date. Bismuth sulfide is suitable as anode owing to its unique laminar structure with relatively large interlayer distance to accommodate larger radius ions, high theoretical capacity and high volumetric capacity etc. In this study, dandelion-like Bi₂S₃/rGO hierarchical microspheres as anode material for PIBs displayed reversible capacity, and 206.91 mAh·g⁻¹ could be remained after 1,200 cycles at a current density of 100 mA·g⁻¹. When applied as anode materials for SIBs, 300 mAh·g⁻¹ could be retained after 300 cycles at 2 A·g⁻¹ and its initial Coulombic efficiency is as high as 97.43%. Even at high current density of 10 A·g⁻¹, 120.3 mAh·g⁻¹ could be preserved after 3,400 cycles. The Na₃V₂(PO₄)₃@rGO//Bi₂S₃/rGO sodium ion full cells were successfully assembled which displays stable performance after 60 cycles at 100 mA·g⁻¹. The above results demonstrate that Bi₂S₃/rGO has application potential as high performance bi-functional anode for PIBs and SIBs.

     

川西甲基卡伟晶岩型锂矿矿床地质特征及成矿机制研究

甲基卡花岗伟晶岩型锂矿床位于松潘-甘孜造山带东缘,在国际国内稀有金属需求大背景下,具有非常重要的战略意义。岩体和矿脉主要侵位于三叠系复理石沉积变质砂岩中,产生一系列的热液接触变质作用,根据矿床地质特征和矿脉产出特征等研究得出,印支造山晚期(稳定期),垂直地壳流动引发底辟作用造成岩浆上涌挤出,导致区域增温引起三叠系复理石沉积局部熔融,形成富Li富F的S型花岗岩浆。岩浆上侵减压发生液态不混溶分离出富挥发性、贫硅酸盐的熔体和贫挥发性、富硅酸盐的熔体,同时伴随着稀有金属元素的矿化,最终在变质盖层中形成透镜状-似层状的富Li伟晶岩脉。     

嘉兴地区文物建筑防雷现状及对策分析

文物是不可再生的珍贵文化遗产,尤其是全国重点文物保护单位更是“国宝”级的稀缺资源.在开展全国重点文物保护单位防雷安全专项检查的基础上,分析了嘉兴地区全国重点文物保护单位的文物建筑防雷现状.结果显示,多数文物建筑防雷安全工作不符合规定要求,存在重大安全隐患,防雷安全问题亟待解决;最后,通过对各文物建筑易造受雷击损害的特点进行了分析,提出了可行的雷电灾害防御对策.     

气动软体驱动器的设计

根据人手指外骨骼关节结构,提出硅胶多腔体仿人柔性关节,设计了一种用于手部康复机器人的气动软体驱动器,详细阐述了驱动器的制作流程。采用Abaqus软件对软体驱动器进行有限元仿真,给出不同气压下的仿真图形。仿真结果表明,提出的软体驱动器的理论模型与实验数据基本吻合,相对于其他结构,整体的稳定性,抓取能力更强,为以后仿人柔性机械手的应用提供了支撑。     

网络式气动软体驱动器设计、制造与实验

采用硅胶材料设计了一种网络式气动软体驱动器,软体驱动器在通气条件下可实现弯曲变形。设计了驱动器模具,并制作了驱动器样机,进行了驱动器静力学实验与有限元仿真。结果表明：软体驱动器具有较好的柔性和灵活性,最大弯曲角度可达到323°。该研究为软体驱动器的进一步应用奠定了基础。     

High coverage H2 adsorption and dissociation on fcc Co surfaces from DFT and thermodynamics

Hydrogen adsorption, desorption and dissociation on the Co(100), (311), (111) and (110) surfaces at different coverage have been systematically studied using density functional theory and ab initio atomistic thermodynamics. On the basis of the computed stepwise H₂ adsorption energies, the saturated coverage on the Co(311), (111), (110) surfaces are 8/18, 3/9 and 6/18 ML, respectively, revealing that these surfaces have different potential hydro-treating abilities and activity. The lateral repulsive interactions can affect the adsorption structures and become stronger with the increasing of H₂ coverage, which lead to H₂ migration over Co surfaces. Comparison of dissociation energies and corresponding desorption energies, it can be concluded that H₂ molecules prefer dissociation rather than desorption both kinetically and thermodynamically at different coverage. Hydrogen stable coverage on the surfaces highly depends on temperatures and H₂ partial pressure. These results should provide important information about morphology of Co-catalysts under Fischer-Tropsch synthesis reduction conditions.     

等通道转角挤压对生物Mg-Zn-Ca合金显微组织与腐蚀行为的影响

旨在探讨等通道转角挤压(equal-channel-angular-pressed,ECAP)对生物医用Mg-3Zn-0.2Ca合金的显微组织以及腐蚀行为的影响。对铸态Mg-3Zn-0.2Ca合金进行了1,2,4道次的剪切挤压变形。采用光学显微组织观察、X射线反射法、电化学等手段研究了挤压道次对镁合金显微组织、织构以及腐蚀行为的影响,也特别关注了ECAP对试样的不同截面方向的显微组织演变以及模拟体液(simulatedbodyfluid,SBF)电化学腐蚀行为的影响。结果表明:ECAP变形后铸态Mg-3Zn-0.2Ca镁合金晶粒逐渐细化,变形后镁合金呈现出与挤压方向呈一定角度的002面剪切织构;随着挤压道次增加,合金的耐蚀性先增加后降低。等通道转角挤压对合金耐蚀性的影响是晶粒尺寸、晶体缺陷和织构变化的综合效果;ECAP变形后合金不同截面方向呈现不同的耐蚀性,垂直于挤压方向截面的耐蚀性优于另2个方向截面的耐蚀性。     

CsPbBr3纳米片–萘之间的高效三线态能量传递

铯铅卤化物钙钛矿纳米晶是光伏和发光应用领域中理想化的三线态敏化材料,具有较高的荧光量子产率和量子限域效应。以三层厚度的CsPbBr₃纳米片（NPLs）为三线态给体,实现了从NPLs到1-萘甲酸（NCA）分子的高效三线态能量传递（TET）。CsPbBr₃ NPLs采用配体辅助再沉淀方法制备,其与NCA分子结合后,稳态荧光被大幅淬灭,荧光寿命从复合前的6.743 ns缩短到0.995 ns,TET效率达到85.3%。通过与大尺寸纳米立方体对比发现,对于CsPbBr₃-多环芳烃复合体系,量子限域效应是获得高效TET的关键。研究结果表明,CsPbBr₃ NPLs作为三线态敏化剂,可应用在基于TET的光子上转换、光催化氧化-还原反应和室温磷光等领域。