553 research outputs found

    Study of P2-Type Layered Oxides and Mixed-Type Phosphates as Cathode Materials for Sodium Ion Batteries

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    随着储能需求的不断增长,钠离子电池作为一类有潜力的廉价能源储存体系开始受到越来越大的关注。为了使钠离子电池在能量密度上具有更强的竞争力,就必须发展具有较高电压的正极材料。正极材料主要可以分为两大类,即氧化物型和聚阴离子型。其中,P2型层状Na-Ni-Mn-O体系和混合聚阴离子型Na4Fe3(PO4)2(P2O7)体系分别在两大类材料中具有相对较高的放电电压。然而,若要使这两类材料体系发挥出较好的电化学性能,仍有许多问题亟待解决。P2型Na-Ni-Mn-O体系材料面临的主要问题是放电电压和放电容量在循环过程中都会出现快速的衰减。如果这一问题无法解决,其将严重阻碍该体系发展成为一类有竞争力的钠离子...With the increasing demand for energy storage, the sodium-ion battery as one type of potential low-cost energy storage system has attracted considerable attention. In order to make sodium-ion batteries more competitive with regard to energy density, it is necessary to develop cathode materials that operate at higher voltages. Cathode materials for sodium-ion batteries can be divided into two categ...学位:理学博士院系专业:化学化工学院_物理化学学号:2052012015352

    Research on the Ways and Methods of Social Work Intervention with the Chronic Illness Elderly in Community ——A Case Study of the “Jian Kang Hu Wei Dui” Project of K community

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    慢性病是危害我国居民健康的第一大因素,严重影响着居民的生活质量。其中,由于老年人的生理因素以及人口老年化的社会因素综合影响下,慢性病老人群体成为慢性病患者的主要人群。慢性病的病因复杂、难治愈、长期性等特征加上其自身的生理、心理因素,导致慢性病老人康复治疗中存在诸多问题。社会各界普遍重视慢性病老人的防治工作,其中医学、护理学、心理学等专业也展开了诸多康复治疗的研究,取得丰富的研究成果。近几年随着社会工作在实践与研究上的丰富,为社会工作介入社区慢性病老人提供了可能。 本研究以K社区的“健康护卫队”服务项目为例,在近一年的服务跟踪和文献分析后,试图通过系统理论探讨社会工作介入社区慢性病老人的方法与...In china, Chronic disease is the most serious factors endangering the health of residents, seriously affecting the quality of life of residents. Due to the combined effects of social factors and physiological factors, the elderly population has become the major group of chronic disease. there are many problems in elderly with chronic disease rehabilitation treatment because of complex,difficulty d...学位:社会工作硕士院系专业:公共事务学院_社会工作硕士学号:1402014115051

    Diversity, distribution and ecophysiology of picoeukaryotes in the South China Sea and its adjacent western Pacific Ocean

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    微微型真核生物主要是一类直径小于或等于3μm的单细胞生物,由于其在生物量和初级生产中的显著作用而被视为海洋生态系统的重要组成部分。尽管如此,目前聚焦西太平洋及其边缘海微微型真核生物多样性、分布和生理生态学的研究极少。本论文综合运用独立于纯培养和基于纯培养等手段揭示了南中国海及其邻近西太平洋微微型真核生物多样性、分布和生理生态学特征,这些结果在理解微微型真核生物在受季风影响的生态系统中的生态作用提供了一些新颖思路。 首先,本研究利用独立于纯培养的分子生态学手段(Sanger测序和454焦磷酸测序)研究南中国海及其邻近西太平洋微微型真核生物18SrDNA多样性。在基于Sanger测序的横跨南中国...Picoeukaryotes, unicellular eukaryotes having a diameter less than 3 μm, are recognized as crucial components of marine ecosystems in terms of their biomass and primary production. However, little is known regarding the diversity, distribution and ecophysiology of picoeukaryotes in the western Pacific Ocean and its marginal seas. Here, we revealed the diversity, distributions and ecophysiology of ...学位:理学博士院系专业:环境与生态学院_环境科学学号:2262009015327

    Research on Construction of Shared Identity in External Affairs between Chinese Mainland and Taiwan

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    在和平发展的新时期,海峡两岸的涉外事务已不能只以过往的零和博弈思维来看待,但两岸间在该领域依然存在重大的理论难题和现实矛盾。本文试图以建构主义理论为分析框架系统的研究两岸在涉外事务中建构共有身份的条件和过程。 在吸收西方理论精华的基础上,同时结合两岸实际,本文提出台湾在国际社会适用的概念。中国主权领土完整,但治权尚未完全统一,台湾资格上是中国的一个地区,但行为能力上具有部分涉外能力,该能力受资格和实力的限制并不完整,因此,台湾的涉外事务受两岸关系影响也受国际社会影响。本文依循建构主义的逻辑认为,国际社会和两岸关系的共有文化包括霍布斯文化、洛克文化和康德文化三种以及共有文化转变阶段的两种以上文...In the new era of peaceful development, the external affairs of the two sides of Taiwan Straits could not be viewed any longer from zero-sum thinking, however, there are still significant theoretical problems and realistic contradictions. This thesis attempts to, based on constructivism analytical framework, do a systematical research on the conditions and process concerning the construction of sh...学位:法学博士院系专业:台湾研究所_政治学理论学号:2562009015362

    Intellectualized Integrated Water Quality Chemical Analysis Instrument based on GPR

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    油井开发中,注入水质和采出油油水分离后水质分析,对于优化开发方案提高采收率,保护油田可采储量具有重要意义。利用GPRS无线通讯技术,可实现多油井水质实时在线化学分析。为此,本文就基于GPRS的智能水质化学分析仪的组成进行了系统研究,测试采用离子选择性电极,并利用GPRS网络所提供的公用平台来实现远程离子分析的数据传输及控制,组成了基于GPRS的智能水质化学分析仪。主要完成的任务有以下几个部分: 一、采用主从结构,用PC架构的ADAM-5510M作为现场数据中心,对I/O资源和开关量资源进行分配,通过C环境制作了PLC控制的远程通讯系统,实现自动溶液滴定、离子电极清洗、油井水质的离子信息的实时...In the exploitation of oil well, the analysis between input water and detached from exploitation oil that is benefit for the project and protecting the well is very important. The technology of GPRS can carry out the real-time chemic analysis of multi-well’s water quality. Aimed at this condition, the article investigate the system of Intellectualized Integrated Water Quality Chemical Analysis Ins...学位:工学硕士院系专业:物理与机电工程学院机电工程系_机械电子工程学号:2005130171

    Analysis of the Problems in Development of Chinese Non-traditional Life Insurance

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    近年来,随着人民生活水平的提高,以及我国经济体制改革向更新层次推进,国内寿险市场保持着快速发展势头,寿险产品的销售结构逐渐由传统型寿险产品向非传统型寿险产品转移,然而非传统型寿险产品的导入国内市场并受到市场热捧时,不断暴露出新的问题,特别是部分代理人在销售过程中采用不规范的展业材料与话术,在一定程度上的误导客户的行为,暴露了国内保险公司在代理人销售行为管理上的薄弱环节。本文围绕着寿险产品的一般发展规律中产品发展线与保险投资及监管的管理发展线这两条主要线索,对非传统寿险产品的发展进行深入浅出的介绍与分析,对目前寿险公司普遍存在的非传统寿险产品的销售管理以及投资渠道上存在的问题加以剖析,有针对性地...In recent years, with domestic life quality improving and economic system reform moving forward, our domestic life insurance market has been growing on a fast pace, and life insurance products’ structure has switched gradually from traditional life products to non-traditional products. However, during this transition, some new issues come out while non-traditional life insurance products have caug...学位:工商管理硕士院系专业:管理学院工商管理教育中心_工商管理硕士(MBA)学号:X19981504

    Study on mechanism of lead biosorption by phanerochaete chrysosporium

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    [中文文摘]通过电子显微镜观察和X 射线光电子能谱测定等分析手段研究了黄孢原毛平革菌 (Phanerochaetechrysosporium)对Pb2 +生物吸附的机理 .实验结果表明 ,该菌种对Pb2 + 的吸附过程是一个以表面络合反应为主要机理的物理化学吸附过程 ,同时也存在着离子交换机理,但它并非主要机理。[英文文摘]Phanerochaete chrysosporium exhibited lead adsorption capacity from aqueous solution up to 108 45 mg/g The biosorption mechanism was researched by the electron micrograph and X rays Photoelectron Spectra The experimental results showed that the main mechanism of lead biosorption was kind of physical chemical process, and metal ions were adsorbed directly on the cell surfaces In addition to surface complex reaction, ion exchange also played a role in the biosorption process, but it was not a main mechanism.国家教委留学回国人员科研启动基

    Analysis of the Contradictions of Keys and Its Significance in Practice

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    通过对生物检索表结构的分析,认为检索表的根本矛盾是标本具有的个性性状与检索表使用的共性性状的矛盾。单道检索表的主要矛盾是检索表对性状的有条件使用与单个标本性状有限性之间的矛盾,因而单道检索表未能很好地解决其基本矛盾,使得其应用范围和使用效果受到诸多影响。多道检索表的主要矛盾是性状数据库内性状的有限性与物种具有的个性性状的无限性之间的矛盾,不存在个性与共性的矛盾,即解决了根本矛盾问题,便于检索应用。Based on analysis of the structure of keys, this paper deems that the fundamental contradiction of keys is the contradiction between the individual characters of specimens and the common characters used in keys.The principal contradiction of single-access key is the contradiction between the characters used conditionally in keys and the finite characters of individual specimens, so single-access key cannot well solve the fundamental contradiction and is limited in applicative areas and on using effect.The principal contradiction of multi-access key is a contradiction between the limited characters of character database and the unlimited individual characters of species, hence there is not the contradiction between individual characters and the common characters.Therefore, multi-access key well resolves the fundamental contradiction and can be utilized expediently.国家自然科学基金(31270234); 厦门大学科研基本业务费项目(2010121089

    海峡两岸对外事务共有利益与协作机制——以以色列为例

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    中国台湾地区和以色列是亚洲的两个最重要的国际热点区域。中东当前处在政治剧变之中,以色列是中东地区的政治和经济强国,两岸高度重视和以色列及中东地区的关系。两岸在这个三方关系格局中存在现实的和潜在的共有利益,以这些利益为基础或目标,两岸建立两个对外事务协作机制有普遍性和战略意义。厦门大学基础创新科研基金研究生项目即中央高校基本科研业务费专项资金项目“海峡两岸对外事务共有利益分析”(项目编号:201122G015)的阶段性成

    两岸政治互信在和平协议系统中的功能

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    结合结构功能主义理论,两岸和平协议的整个政治进程及相关各因素总和是一个系统,该系统在时间向度上分为历史结构和现实结构,在空间向度上分为差序结构和平等结构。由此,进一步论证两岸政治互信对这四个结构以及对系统本身所起的功能,分别是:整合功能、适应功能、维持功能和目标达成的功能。在分析的过程中对相关功能,从系统损益的角度做一定评估。厦门大学基础创新科研基金研究生项目即中央高校基本科研业务费专项资金项目“海峡两岸对外事务共有利益分析”(项目编号:201122G015)的研究成果之
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