763 research outputs found

    Modification of Lithium Rich Mn-based Layered Cathode Material for Lithium-ion Batteries

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    富锂层状锰基正极材料具有比容量高、低成本和良好的安全性能等特点,是下一代高容量锂离子二次电池关键材料之一。本论文主要从材料合成、晶格修饰和表面修饰方面出发,系统探讨它们对富锂层状锰基正极材料的电化学性能的影响,从而深入的理解电化学反应过程的机理和结构变化,尤其是对“电压降”现象的影响。具体内容如下: 1. 分别以简易液相成核法制备得到粒径较为均一的球形xLi2MnO3(1-x)LiMn1/3Co1/3Ni1/3O2(x=0.3,x=0.5,x=0.7)材料和常规共沉淀法制备得到无形貌的纳米xLi2MnO3(1-x)LiMn1/3Co1/3Ni1/3O2(0&#...The layered lithium-rich manganese-based solid state material, with high capacity, low cost and good safety, has been as one of the key point cathode material for the next high-capacity lithium-ion battery. In this paper, respectively, from synthetic method, lattice modification and surface modification, we detailed discussion their impact on the electrochemical properties of layered lithium-rich ...学位:工学博士院系专业:能源学院_能源化工学号:3242013015402

    Design and Implementation of Personnel Management System for a Hospital

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    人事管理是医院管理工作的核心内容,也是衡量医院综合医疗水平的主要参考因素。通过人事管理系统对医院人事工作进行管理,不仅使得相关管理人员摆脱了繁琐而重复的工作,更为重要的是使医院能够依据人力资源管理系统所提供的准确而快捷的信息对员工的使用做出正确的决策,充分发挥员工自身的能力,为医院带来更大的经济利益。因此,本论文设计并实现了基于J2EE的某医院人事管理系统,完成了以下的工作: 首先,通过对某医院所有人事管理相关人员进行的需求调研与分析,确定了该系统应该具备的功能包括:人事档案基本信息管理、考勤管理、绩效考核管理、查询统计分析、系统管理等,并根据使用环境的限制约束了系统的非功能性需求; 其次...Personnel management is a core content in hospital management and of key importance in evaluating a hospital’s medical service standard. Personnel management system sets Personnel management department free from tedious and repetitive daily jobs, improves management efficiency, provides solid basis for hospital decision-making, and brings bigger economic returns. This dissertation design and real...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323220

    Study of differential cytokine IFN-γ,IL-10,TGF-β and IL-17 level in patients with myasthenia gravis with antibodies against AChR ,MuSK and LRP4

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    目的:通过采用酶联免疫吸附(ELISA)法检测重症肌无力(myastheniagravis,MG)患者血清乙酰胆碱受体抗体(AChR-Ab),肌肉特异性酪氨酸激酶抗体(MuSK-Ab),低密度脂蛋白受体相关蛋白4抗体(LRP4-Ab)浓度,探讨AChR-Ab,MuSK-Ab,LRP4-Ab与重症肌无力临床分型、及与细胞因子干扰素-γ(IFN-γ),白细胞介素-10(IL-10),生长转化因子-β(TGF-β),白细胞介素-17(IL-17)的关系。 方法: 1.本研究分为重症肌无力组和健康对照组 重症肌无力组,重症肌无力患者31例,均为2014年12月至2015年6月厦门大学附属第一医院...Objective: By detecting the serum concentrations of AChR-Ab ,MuSK-Ab and LRP4-Ab in myasthenia gravis patients, To explore the correlations among the serum concentrations of AChR-Ab ,MuSK-Ab and LRP4-Ab in peripheral blood and clinical characteristics and the level of IFN-γ,IL-10,TGF-βand IL-17 in serum. Methods: 1. This study is divided into myasthenia gravis group and healthy controls. M...学位:医学硕士院系专业:医学院_神经病学学号:2452013115348

    Feedback-induced nonlinearity and superconducting on-chip quantum optics

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    Quantum coherent feedback has been proven to be an efficient way to tune the dynamics of quantum optical systems and, recently, those of solid-state quantum circuits. Here, inspired by the recent progress of quantum feedback experiments, especially those in mesoscopic circuits, we prove that superconducting circuit QED systems, shunted with a coherent feedback loop, can change the dynamics of a superconducting transmission line resonator, i.e., a linear quantum cavity, and lead to strong on-chip nonlinear optical phenomena. We find that bistability can occur under the semiclassical approximation, and photon anti-bunching can be shown in the quantum regime. Our study presents new perspectives for engineering nonlinear quantum dynamics on a chip.Comment: 10 pages, 9 figure

    A Study on Heath of the Oldest Old and Countermeasures from Regional Perspective

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    我国高龄化趋势逐渐凸显,确保高龄老人“健康老化”成为我国高龄事业发展的重要议题。研究使用SPSS19.0与HLM6.02软件,基于“全国老年人口健康状况调查项目”(CLHLS)2011年截面数据,构建高龄老人区域健康分层线性模型(HLM模型),探讨区域自然环境与社会环境因素对高龄老人自评健康、日常生活自理能力和认知能力的影响与作用机制。研究发现,①城镇高龄老人健康状况总体好于农村群体,东部地区总体好于中部和西部地区;②自然环境、医疗状况、社会保障、社区服务和主食结构显著影响高龄老人健康;③区域因素通过增强或削弱个体因素影响作用的表达,间接影响高龄老人健康状况:气温较低、降水偏少的北方地区,多参...The population of the oldest old in China is getting larger recently. It is important to ensure the “healthy aging” for these people. By using SPSS19.0 and HLM6.02, the study builds a hierarchical linear model(HLM) and a factor analysis based on the cross-sectional data of Chinese Longiudinal Healthy Longevity Survey(CLHLS) in 2011. This model can help us to understand which regional factors affec...学位:管理学硕士院系专业:公共事务学院_社会医学与卫生事业管理学号:1392013115031

    清代福建风暴潮灾害与防治

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    因地理环境影响,清代的福建省尤其台湾岛是海洋风暴潮灾的多发区。面对频繁发生的海洋风暴潮灾,福建人民为抗击灾害而共同努力着:创办义仓,修筑长堤以备灾;地方官员在临灾抢救,在朝廷赋予自助支配官银赈灾的权力下迅速展赈济灾;由地方士绅耆老倡捐银粮以赈灾民等。通过对这些赈灾措施的考察,以希能为我们今天抗击风暴潮灾的社会应对提供借鉴和帮助。中国海洋发展研究中心青年项目资助;项目编号:AOCQN20080

    Respond to marine disasters and society in the Qing Dynasty

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    中国自古以来就是一个海洋灾害频发的国家,在史书上几乎每一年都有海洋灾害的记载。恶劣的地理环境虽然给海洋先民的生存和发展带来了阻力,但从客观上来说,它同时也刺激了海洋先民改造自然的无穷智慧和力量。所以从某种意义上讲,中国古代海洋文明史也可以称作是一部中国海洋先民与自然抗争的海洋开发史、海洋灾害史。 清代的沿海地区是当时中国社会经济较为发达的地区,是全国经济重心所在,同时也是遭受海洋灾害最严重的地区。本文以海洋为本位,海洋社会整体史为视角,从自然环境、灾害救助与灾害心理慰藉三个方面来研究清代海洋灾害的发生与社会各阶层的赈济救灾活动。 文中首先概括性地介绍清代中国沿海地区的疆域变化、自然环境与人...China has been a country with frequent marine disasters since ancient times. The records of marine disasters almost can be found in every year’s records in history books. The abominable geographical environment brought the adverse effects to the marine ancestors, however, objectively speaking, it also stimulated the transformation of the marine ancestors’ infinite wisdom and power to change the na...学位:历史学博士院系专业:人文学院历史学系_中国古代史学号:1032007015374

    中国古代赤潮记录的发现与辨析

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    赤潮灾害,是当代中国乃至世界经常发生的,可以造成巨大损失的海洋灾害之一。在现代的海洋自然科学论著中,征引历史上赤潮的史料十分有限,而且对已知史料的分析,常与淡水中的“水华“现象混为一谈。本文结合历史文献记载,通过对自然科学论著中常用的中国古代赤潮记录进行分析,探讨中国古代赤潮灾害爆发的历史现象,并试分析其产生原因
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