Preparation and Electrochemical Performances of Ti-based Composites as Anode Materials for Lithium Ion Battery

新一代电动汽车要求其驱动电源具有快速充放电能力，而传统的碳负极材料在倍率性能、安全性能等方面已经不能很好地满足动力电池高功率的需求，所以研发新型非碳类高功率动力型锂离子电池负极材料具有重要的意义。 钛基负极材料（Li4Ti5O12和TiO2等）具有在充放电过程中体积变化小、可逆性高、环境友好、成本低等优点，是高功率锂离子电池理想负极材料之一。本文采用水热法、溶胶凝胶法和喷雾干燥法等制备纳米级Li4Ti5O12材料；并通过回流法及水热与回流相结合的方法制备了SnO2/石墨烯、Fe2O3/石墨烯及TiO2/石墨烯等复合材料，研究其电化学性能。主要结果如下： 1.采用水热法、溶胶凝胶法和喷雾干燥...With the rapid application of electronic vehicles (EV) and hybrid electronic vehicles (HEV), it requires higher energy and power density, which is a great challenge for carbon-based materials (typically graphite) used as anode materials. Therefore, research and development of negative materials for Lithium-ion batteries with excellent high-rates performance are desirable and significant. Ti-base...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：2052009115139

公共利益本位视角下城乡规划变更实现机制探究

随着城市快速发展,城乡规划变更面临诸多问题,涉及土地价值、性质以及相关利益关系的重新分配,从而引发相关利益群体不同程度的利益\"受损\"或\"受益\"。基于公共利益本位,探讨规划变更实现的关键性问题,提出在规划变更过程中,利益相关人的参与有利于对规划行政主体进行监督与约束,从而实现行政权与公民权的\"平衡\";行政主体对\"受损\"的个人利益进行合理补偿,以实现公共利益与个人利益的\"平衡\",为我国城乡规划变更得以顺利实现提供可行思路

Mutant strain for collecting cystis PCCCCC6803 and application thereof

本发明属于工业微生物领域，具体涉及一种对乙醇耐受性显著提高的集胞藻PCC6803突变株及其应用。乙醇耐受相关基因为slr0599，其碱基序列为SEQ ID No.7所示。突变株为PCC 6803△slr0599已于2017年8月4日保存在于中国微生物菌种保藏管理委员会普通微生物中心(CGMCC)，地址北京市朝阳区北辰西路1号院3号，保藏编号CGMCC14333，分类学命名集胞藻Synechocystis sp.。本发明集胞藻突变株为耐受乙醇突变株，在1.5％(v/v)的乙醇胁迫下，该藻株的生长状态明显优于野生型藻株。本发明得到的乙醇耐受性藻株对利用集胞藻生产生物燃料乙醇具有重要的应用价值和借鉴意义，应用前景广泛

Response of serine/threonine protein kinase SpkC to high temperature stress in Synechocystis sp. PCC 6803

Serine/threonine protein kinases play important roles to sense and transduce signal to cope with external environment. However, functions of many serine/threonine protein kinases in cyanobacteria are still unknown. [Objective] This study aims to explore whether SpkC in Synechocystis sp. PCC 6803 responses to high temperature stress. [Methods] We used the homologous recombination method to construct the spkC gene knockout mutant (ΔspkC), and then compared the growth rate, pigment contents of ΔspkC mutant and the wild strain under high temperature stress. In addition, we detected chlorophyll fluorescence under high temperature stress. Recoveries of ΔspkC and wild strain from high-temperature stress were determined through measuring the growth rate under normal temperature. [Results] Compared with wild type strain, ΔspkC mutant grew slower, and the contents of three photosynthetic pigments (chlorophyll, carotenoid and phycobilin) decreased after high temperature stress at 42 °C. The activity of photosynthetic system II in ΔspkC decreased more rapidly at 45 °C. What's more, ΔspkC strain was not able to recover after high-temperature stress for 5 days; their survival rate was significantly lower than wild-type. [Conclusion] The deletion of spkC led to severe defect response to high-temperature stress in Synechocystis sp. PCC 6803, which suggests that serine/threonine protein kinase SpkC is involved in response processes against high temperature stress

Electrochemical Activities of Oxygen-Doped Graphite Surface for V(Ⅳ)/V(Ⅴ) Redox Couple

采用氧气等离子体处理石墨电极表面,实现氧及含氧官能团的掺杂,以改善VO2+/VO2+电对的反应活性.fT-Ir和EdS测试结果表明,氧气等离子体处理石墨表面引入了含氧官能团,从而提高了VO2+/VO2+电对的电化学活性.在本文实验条件下20 MIn等离子体处理的电极活性最好,8 MA.CM-2电流密度恒流充放电,石墨电极VO2+/VO2+电对库仑效率达到91%,比未处理电极的库仑效率提高了19%.Graphite plate electrodes were treated with oxygen plasma and doped with oxygen as well as oxygen functional groups.With the treatment,the activities of graphite plate electrodes toward VO2+/VO2+ redox reaction were improved.FT-IR and EDS analysis results indicated that oxygen functional groups were introduced to the surface of graphite plates after oxygen plasma treatment.In this paper,the graphite plate treated for 20 min showed the highest activity.The average charge efficiency reached 91%,suggesting an increase of 19%,compared with that of the untreated graphite plate under a current density of 8 mA.cm-2.国家自然科学基金项目(No.200933005;No.20903077); 国家973计划项目(No.2009CB220102)资

Common chlorella chloroplast homologous recombination vacant carrier and application thereof

本发明涉及基因工程技术领域，具体涉及一种普通小球藻叶绿体同源重组空载体及其应用。重组空载体包括上下游同源臂，以及同源臂间设至少一个启动子和终止子，启动子和终止子之间插入与至少一个外源基因构成多顺反子结构的SEQ ID NO : 7所示的碱基序列；其中，上游同源臂含SEQ ID NO : 1所示碱基序列，下游同源臂含SEQ ID NO : 2所示碱基序列。采用本发明的普通小球藻叶绿体稳定表达系统, 可实现多个外源基因在叶绿体中稳定表达

Obliquus chloroplast homologous recombination vacant carrier and application thereof

本发明涉及基因工程技术领域，具体涉及一种斜生栅藻叶绿体同源重组空载体及其应用。载体包括上下游同源臂，以及同源臂间设启动子和终止子，启动子和终止子之间插入与至少一个外源基因构成的多顺反子结构的SEQ ID NO : 6所示的碱基序列；其中，上游同源臂含SEQ ID NO : 1所示碱基序列，下游同源臂含SEQ ID NO : 2所示碱基序列。采用本发明的斜生栅藻叶绿体同源重组空载体可实现多个外源基因在叶绿体中稳定表达

Molecular cloning of hexokinase from Parachlorella kessleri and its expression analysis under different trophic modes

cDNA (GenBank ID: AHF54566) encoding hexokinase (termed CkeHK) from the green alga Parachlorella kessleri was cloned and sequenced to understand the response to the presence and uptake of glucose at the molecular level. The transcriptional expression patterns of CkeHK were observed under phototrophic, heterotrophic, and mixotrophic culture conditions. The results indicated that the CkeHk cDNA was 1, 844 base pairs (bp) long, with an open reading frame (ORF) of 1 389 bp encoding 462 amino acids, with a calculated molecular mass of 49.73 kDa and an estimated isoelectric point of 6.98. Under the phototrophic condition as control, the transcriptional profiles of CkeHk showed that it could be upregulated under the heterotrophic and mixotrophic culture conditions. The mRNA level of CkeHK under the mixotrophic culture condition could be upregulated more than that under the heterotrophic culture condition. These results suggest that light may play an important role in regulating the role of hexokinase in metabolizing exogenous glucose. These findings provide us valuable information for exploring the mechanism of metabolizing glucose in P. kessleri

3-RSS同轴驱动布局并联机构的打磨机器人设计与运动分析

针对目前串联型打磨机器人在打磨球面时存在刚度不足的问题，提出一种3-RSS同轴驱动布局并联机构工具型打磨机器人。同轴驱动布局是将驱动布置在同一轴线，主体由基柱和3组可以绕基柱旋转的机械臂构成，每个机械臂外接支链杆簇，3组支链杆簇与末端打磨头相连。通过构型分析、结构设计，建立同轴驱动布局打磨机器人模型，并对模型进行运动学分析，通过雅可矩阵分析奇异位置，获得打磨机器人的灵活工作空间；经过运动仿真，对比预设路径与仿真轨迹，进行运动误差分析，验证了驱动方案的可行性。研究结果为并联机构打磨机器人拓展工作空间、提高刚度提供了理论与技术支持