FEC基电解液对高压正极材料Li2CoPO4F电化学性能的影响

本文研究了以氟代碳酸乙烯酯FEC（fluoroethylene carbonate）为共溶剂的电解液对高压正极材料Li2CoPO4F电化学性能的影响,与碳酸酯基电解液1 mol·L-1LiPF6EC/DMC=1:1（m:m）相比,1 mol·L-1LiPF6FEC/DMC=1:1（m:m）可显著提高Li2CoPO4F的循环稳定性.通过线性扫描伏安法（LSV）、扫描电镜（SEM）、X射线光电子能谱（XPS）、X射线衍射（XRD）结合电化学阻抗（EIS）对FEC改善Li2CoPO4F材料循环稳定性的机理进行了探索,结果表明与传统碳酸酯基电解液相比,FEC基电解液在高压下有着优异的抗氧化性,能够有效抑制电解液的氧化分解.同时,FEC基电解液中形成的表面膜具有更高的稳定性,能够抑制电极/电解液界面副反应的发生,提高循环过程中电极材料结构稳定性,从而有益于提高Li2CoPO4F材料的电化学性能.福建省自然科学基金项目(No.2014J05019);;国家自然科学基金项目(No.21233004,No.21303147);;厦门大学校长基金(No.20720150090)资

Rescaling and Scalar Politics in the‘One Belt, One Road'Strategy

目前,"一带一路"已成为中国的核心发展战略之一。借鉴尺度重构和尺度政治理论,分析"一带一路"战略的内涵、影响和风险。研究发现"一带一路"战略重构了现有的国家角色和地域形式,催生了以跨国基础设施为基础、以资本和经贸合作为支撑的新尺度。该尺度一方面被国际和国内的资本和权力关系不断重构,另一方面也在重构着现有的权力关系和资本积累过程。还从尺度政治视角出发探讨了"一带一路"战略中的风险因素。在国际层面,中国既面临着基于多边国际关系和地方抵抗的尺度上推力量,也面临着基于旧有边界和尺度化表达的尺度下推因素。在国内,"一带一路"战略既面临着地方政府基于政策争夺和地方保护主义产生的重复建设问题,也存在疆独势力等通过国际联系复杂化地方趋势的风险。为了更好地推行"一带一路"战略,中国必须积极应对这些尺度政治的挑战,深入研究尺度政治的机制和破解之道,努力化解海外投资、国际合作和地方治理中的风险。‘One Belt, One Road'(OBOR) was proposed by President Xi Jinping in 2013 when he visited Kazakhstan and Indonesia. It is now the core regional development strategy in China. A series of studies(mainly in Chinese) have been conducted to provide the contextual knowledge or suggestion for this strategy. However,a theoretical examination of OBOR remains at the very superficial level among existing scholarship. This study aims to analyze the nature and impacts of OBOR from the perspective of rescaling and scalar politics,with a balanced consideration on the political geographical mechanisms and potential risks for promoting OBOR. It is argued that OBOR reshapes the roles and territoriality of Chinese state and produces a number of new geographical scales based on construction of international infrastructure, capital flows and trade cooperation. Specifically, the state power is re-territoralized through forming new international organizations and investing in the international infrastructure; the importance of some large cities are also highlighted as the nodes of OBOR. In other words, the inter-national processes are embedded in sub-national regions or new state spaces, confirming the previous theories on‘localization'. The rescaling strategies enable China to gain more influence on Eurasian geo-political and economic processes and more space to accelerate its capital accumulation.This echoes Lefebvre's arguments that the spatial fix of urban growth is based on scalar fixes. Therefore, it is interesting to note that the scale and power relations are mutually constructed. On the one hand, scale is produced and reconstructed by both international and domestic political powers and capitals; on the other hand,the rescaling processes have great impacts on the existing power relations and capital accumulation. The perspective of scalar politics suggests that there are some potential hindrance and risks behind this new initiative.At the international level, China is not only facing complex up-scaling forces related to the multilateral and international relations and local unrests, but also confronting the down-scaling forces based on the existing boundary and scalar discourses. At the domestic level, OBOR may lead to excessive competition, over accumulation and repeated construction due to local protectionism determined by the political promotion system in China. Some potential risks may also be caused by Xinjiang separatists, who can get supports easier than with the further opening of China to the rest of the world in the OBOR strategy. China must cope with these scalar politics actively in order to promote "one belt one road" strategy. This research has much policy implication for Chinese government to smooth the mechanisms of scalar politics on internationalization and reduce the potential risks of oversea investment, inter-national cooperation and regional governance. This aticle also furthers the understanding of scale in human geography by integrating discussions of rescaling and scalar politics from different sub-disciplines.国家自然科学基金项目(40701041;51208444);; 教育部人文社会科学研究基金项目(12YJAGJW007;11YJCZH058);; 中央高校基本科研业务费(20720140519)资助~

A review of inorganic solid electrolyte/electrode interface in all-solid-state lithium batteries

全固态锂电池有望较好地提高电池安全性并实现高的能量密度, 因此已成为二次锂电池发展的一个重要方向.; 发展具有高锂离子电导率、低电解质/电极界面阻抗及有较好应变性的固态电解质材料是全固态电池研究的重要研究课题. 如何有效构筑电解质/电极界面,; 提高界面稳定性并显著降低界面阻抗又是其中的难点之一.; 本文综述了近年来国际上比较关注的两种无机固体电解质--硫化物与石榴石(garnet)型氧化物的最新研究进展,; 重点对这两类固体电解质与正负极材料的界面特性进行总结与评述.All-solid-state lithium batteries have attracted great interest, due to; its potential to significantly improve battery safety and realize higher; energy density. A solid electrolyte with high Li-ion conductivity, a; small electrolyte/electrode (including cathode and anode interface); interfacial resistance and good strain tolerant is a key component in; all-solid-state lithium batteries. Rational design of efficient; electrolyte/electrode interfaces to improve the stability of interface; and significantly decrease the interfacial resistance is one of the key; challenges in enabling all-solid-state lithium batteries. This paper; reviews the state-of-the-art development of some solid electrolytes; which has received extensive attention, eg. sulfides and garnet type; oxides. Major issues associated with electrolyte/electrode interface of; these two type solid electrolytes are summarized and analyzed.国家自然科学基金; 国家重点基础研究发展计

Study on the Thermal Degradation Behavior of Tanshinones during the Process of Reflux Extraction

用甲醇作提取溶剂,在回流条件下考察了从丹参药材中提取丹参酮类有效成分的过程中,隐丹参酮、丹参酮I及丹参酮IIA等三种丹参酮的热降解行为。结果表明,回流提取过程中所考察的三种丹参酮均发生严重的热降解,降解速率:丹参酮IIA>丹参酮I>隐丹参酮,其热降解均具有零级反应动力学特征;同时,回流提取过程中丹参酮的热降解是在丹参酮共萃物存在下发生的。Thermal degradation behavior of cryptotanshinone,tanshinone I and tanshinone IIA has been studied during the process of reflux extraction of tanshinones from Salvia miltiorrhiza Bge.with methanol as extracting solvent.The obtained results showed that the thermal degradation of cryptotanshinone,tanshinone I and tanshinone IIA occurred obviously during reflux extraction in the order of degradation rate:tanshinone IIA>tanshinone I>cryptotanshinone,and their thermal degradation was featured with zero order reaction;meanwhile,it was under the existence of other components coextracted with tanshinones that the thermal degradation of cryptotanshinone,tanshinone I and tanshinone IIA occurred.国家自然科学基金重点项目(20235020

Optimized analysis of precision grinding machine bed based on neural network

变形和固有频率是评价精密机床结构刚性的重要参数。为了提高磨床的整体刚性,提出一种利用bP神经网络来优化精密磨床床身结构的方法。以自主开发的高精度平面磨床2Mk1760为研究对象,利用有限元分析软件AnSyS对床身进行静力分析和模态分析。为了减小精密磨床的变形和振动,将部分关键参数作为神经网络的输入,以此预计床身尺寸参数与变形量和固有频率之间的关系,从而获得磨床床身的优化尺寸。分析结果表明,通过神经网络优化后的床身变形量相比初始结构减小了36.51%,而固有频率增加了11.96%。Deformation and inherent frequency are key parameters to evaluate structure rigidity for precision machine tool.In order to improve rigidity for grinding machine,this study proposes a method that using neural network to optimize the structure of precision grinding machine bed.Take precision grinding machine tool( 2MK1760) which is self developed for an example,the static structure and dynamic modal analysis is carried out by using finite element method( ANSYS).In order to alleviate the influence of deformation and vibration on precision grinding machine bed,some parameters are served as input of BP neural work model,which estimate the relationship between deformation and inherent frequency.According to analysis results,an optimization is obtained to determine the dimension of precision grinding machine bed.The results indicate that the deformation after neural network optimization compared with initial structure has decreased by 36.51%,meanwhile,the natural frequency has increased by 11.96%.国家自然科学基金项目(51075343); 福建省自然科学基金项目(2012J05102

Ultrasound-assisted Extraction of Tanshinones from Analytical Samples of Salvia miltiorrhiza Bge.

为了提取丹参分析样品中隐丹参酮、丹参酮I及丹参酮IIA等有效成分,建立了以CH3OH-CH2Cl2为提取溶剂的超声波辅助提取法。优化的提取条件是,液/固比:133.3 mL/g,提取溶剂组成:φ(CH2Cl2)=0.2,提取时间:8 min。与几种常规提取法(如甲醇回流法、CH3OH-CH2Cl2室温浸取法)相比较,超声波辅助提取法具有提取时间短、丹参酮提取量高等优点,适用于丹参中隐丹参酮、丹参酮I及丹参酮IIA同时测定的样品前处理。An ultrasound-assisted extraction method for cryptotanshinone,tanshinone I and tanshinone IIA from analytical samples of Salvia miltiorrhiza Bge.was established.The optimal extraction conditions were obtained as follows:φ(CH_2Cl_2)=0.2 CH_3OH-CH_2Cl_2 as extracting solvents,8 min of extraction time and 133.3 mL/g of extracting solvent-to-sample ratio.Compared with conventional methods,such as methanol reflux extraction and CH_3OH-CH_2Cl_2 macerating at room temperature,the method of ultrasound-assisted extraction has the advantages of short extraction time and high efficiency for extracting tanshinones,which suggests that it is suitable for sample pretreatment in the simultaneous determination of cryptotanshinon,tanshinone I and tanshinone IIA in Salvia miltiorrhiza Bge..国家自然科学基金重点项目(20235020

ONE NEW SPECIES AND ONE NEW RECORD SPECIES of EIRENIDAE FROM THE TAIW AN STRAIT,CHINA

记述了采自台湾海峡软水母亚纲lEPTOMEduSAE HAECkEl,1866、和平水母科EIrEnIdAE HAECkEl,1879 1新种,无疣杯水母PHIAlOPSIS AVErruCIfOrMIS SP.nOV.和我国海域1新纪录种,母芽侧丝水母HElgICIrrHA MEduSIfErA(bIgElOW,1909),对其形态特征进行描述。模式标本保存于国家海洋局第三海洋研究所。The samples of Eirenidae were collected from the Taiw an Strait,China( 20.85°- 27.06° N,114.92°- 121.24°E) during July 2006 and Jan.2007.One new species of Phialopsis averruciformis sp.nov.and one new record species of Helgicirrha medusifera( Bigelow,1909) are described in the present paper based on the type specimens from the T aiw an Strait,China.The specific diagnosis of the new species is as follows.我国近海海洋综合调查与评价(908专项)(908-ZC-Ⅱ-02;908-01-BC07;908-02-0102;908专项海洋生物样品库); 国家海洋局“全球变化与海气相互作用专项”资助~

Design of Punching and Shearing Open Numerical Control System Based on Flexible Manufacturing Model

为了满足敏捷制造发展的要求,使传统制造设备实现快速柔性制造,本文针对传统冲裁加工研发了一个柔性冲裁模具系统,介绍了系统的组成模块及其功能结构。面向研发对象详细阐述了其中运动控制模块的开放式数控系统的开发,从硬件平台的搭建、软件系统的实现两方面介绍了整个系统的设计,同时给出了令人满意的实验加工结果。In order to satisfy the development request of agility manufacturing,make the traditional equipment realize rapid and flexible manufacturing,a flexible mould system was proposed in view of the traditional punching and shearing,its components and function structure was introduced.To face researched object,design of the open numerical control system of the movement control mould was explained.The system design from building of hardware platform to realization of software system was introduced,and the satisfying experimental results were given

An Investigation of the Professional Development of Primary and Secondary School P. E. Backbone Teachers in Fujian Province

采用文献法、调查法、统计法、逻辑法等研究方法,以参加2013—2015年福建省基础教育万名骨干教师培训中的190名中小学体育骨干教师为调查对象,对教师基本情况和教师专业发展的认识、态度、知识、能力、继续教育等现状进行调查,在此基础上对教师专业发展现状进行分析,总结出我省中小学体育骨干教师专业发展的特点及存在的问题,并提出相应的建议,给我省中小学体育教师培训机构的改革提供依据,同时为我省中小学体育教师专业发展提供参考与借鉴,为进一步深化我省中小学体育教育改革提供人才保障.结果表明:1)目前,福建省中小学体育骨干教师以年富力强者居多,年龄、职称结构较合理;教师专业发展意识强,学历层次由大专逐步向本科、硕士过度,但硕士比例小;2)教师专业发展态度端正,职业的稳定性和责任感强烈,但部分年轻教师缺乏专业发展的自主性;3)教师对专业知识的掌握比较扎实,主要通过互联网、图书资料、专家报告或讲座等方法来获取专业知识;4)专业能力水平方面,教师在体育教学、课外指导、体育保健、现代教育技术运用等方面能力比较强,而创新教育和科研两方面能力相对比较薄弱;5)当下,我省中小学体育骨干教师最需要强化的培训是课题申报技能、论文写作能力、专题讲座能力、教育科研方法、提高学历层次、教学设计能力,其中提高科研能力和水平是教师们最迫切的愿望.2014年福建省中青年教师教育科研项目(社科A类)(JAS14023

促胰岛β细胞增生的黄酮类化合物的活体筛选

目的利用斑马鱼为模型进行黄酮类药物筛选,以期发现促进胰岛β细胞增生的药物。方法对生长5 d的斑马鱼胚胎进行黄酮类药物处理,并进行β细胞计数,筛选出能够促进β细胞数量增加的药物,并进一步分析其促进β细胞增加是源自于已有β细胞的复制或前体细胞的分化。结果淫羊藿素(Icaritin)能够增加胰岛β细胞的数量,并明显促进β细胞的复制。同时,我们发现有几个黄酮类化合物具有降血糖的作用。结论淫羊藿素能够明显促进β细胞的自我复制从而促进β细胞的增生。国家自然科学基金(No.81670709);;福建省自然科学基金(No.2017J01145);;中央高校基本科研业务费(No.20720170104、20720180044