1,638 research outputs found

    Construction of Raman spectroscopy system and implementation of algorithm based on shifted excitation method

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    拉曼光谱技术作为一种强有力的分子结构研究工具,广泛应用于材料物理、生物医学、食品安全等领域。然而很多物质比如药品、食品的拉曼光谱检测过程都伴有强荧光干扰,荧光的存在严重影响拉曼光谱特征峰的识别,此外探测器本身的噪声和暗电流严重影响着弱拉曼特征峰的探测,因此非常有必要采取措施抑制荧光干扰和提高拉曼光谱系统的信噪比。 移频激发法是一种简单通用的荧光抑制方法,它常采用两个波长相近的激发光源分别激发样品得到两幅拉曼光谱,对这两幅光谱作差分,从而有效地消除荧光的影响。本文研究了移频激发法的荧光抑制原理,并分析了从差分光谱中提取真正拉曼光谱的复原算法需要克服的干扰因素。此外,对多种复原算法进行了详细的推...Raman spectroscopy technique as a powerful tool to investigate the molecular structure is widely used in material physics, biomedical, food safety and other fields. However, Raman spectroscopy detection process of many substances such as pharmaceuticals and food is always accompanied by strong fluorescence interference. The existence of fluorescence seriously affects the recognition of the charact...学位:工学硕士院系专业:物理与机电工程学院_微电子学与固体电子学学号:1982012115278

    Study on the distribution and diversity of nanoflagellate in the Yangtze estuary and continental shelf of East China Sea

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    本研究应用荧光显微技术、荧光标记颗粒示踪法以及Illumina高通量测序技术,分别于2013年春季、2013年夏季和2013年秋季开展了对长江口及东海陆架区微型鞭毛虫的丰度分布、异养细菌的摄食和群落多样性的研究,并初步探讨了影响微型鞭毛虫分布、摄食和群落多样性的因素。主要结果如下: (1)长江口及东海陆架区微型鞭毛虫的丰度变化范围为0.41-7.15×103cellsml-1,微型鞭毛虫丰度的最高值出现在夏季,最低值出现在秋季,表现出明显的季节变化特征。基于丰度比得出的微型鞭毛虫营养结构也有着典型的季节特点:春季微型鞭毛虫以含色素体微型鞭毛虫(PNF)为主;夏季和秋季微型鞭毛虫以异养微型鞭毛...We carried out ecological studies on nanoflagellate(NF) in the Yangtze estuary and continental shelf of East China Sea. Through the use of the fluorescent microscope technique, fluorescent dye particle tracer method and illumina high-throughput sequencing, we investigated the spatial and temporal distributions, the grazing on heterotrophc bacteria and the community structure and diversity of nanof...学位:理学硕士院系专业:海洋与地球学院_海洋生物学学号:2242011115139

    Design and Simulation of Contact Fatigue Testing System of Flexspline and Circular Spline in Harmonic Drive

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    谐波齿轮传动是随着空间技术的发展而诞生的一种新型传动方式,其工作原理是利用柔轮的弹性变形波来实现运动或者动力传递,因其具有结构简单、传动精度高、传动比大等诸多优点,在航空、航天、机器人等领域得到了广泛应用。在谐波齿轮传动过程中,柔轮的运动情况比较复杂,作为弹性薄壁构件需承载交变应力,容易造成齿面磨损和疲劳断裂。因此,建立合适的模型对谐波齿轮传动过程中柔轮的错齿运动进行模拟分析具有重要意义。 本文首先针对谐波齿轮传动过程中柔轮的错齿运动设计了一种新的接触疲劳试验装置,根据机械设计原理对装置各个零件进行强度与刚度校核。并根据已知参数、实际工况与啮合参数,设计了柔轮与刚轮的基本结构。基于两者的齿形...Harmonic drive is a new driving method emerged with the development of space technology that utilizes the elastic deformation wave of a flexspline to achieve motion transmission or power transmission. It has many advantages such as simple structure, high precision and high transmission ratio. Hence harmonic drive is widely used in industrial fields including aircraft industry, aerospace industry, ...学位:工学硕士院系专业:航空航天学院_航空宇航推进理论与工程学号:3202013115287

    渤海海峡跨海通道与胶东半岛、辽东半岛旅游一体化发展

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    胶东半岛、辽东半岛间“C”型交通现状阻碍其旅游一体化发展。渤海海峡跨海通道的建设将使得两大半岛地理上相互衔接,增加旅游客源,加快旅游资源要素的流动,帮助公众积极参与旅游战略合作规划,从而推动胶东半岛、辽东半岛旅游经济一体化发展,发挥其旅游资源一体化优势,促进两地旅游一体化可持续发展

    关于拟遗传代数的Kazhdan-Lusztig 理论

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    用同调代数的方法, 研究拟遗传代数与其反代数, 与其标准商代数之间关于Kazhdan-Lusztig 理论的性质. 证明了: 设拟遗传代数(A , +) 有相应于长度函数l 的Kazhdan-Luszig 理论, 则它的反代数(A op , +) 也有相应于l 的Kazhdan-Lusztig 理论, 它的标准商代数(A öE iA ,+ i) 有相应于诱导函数l′的Kazhdan-L usztig 理论.国家自然科学基金资助 教育部优秀青年教师基金 福建省优秀留学回国人员基

    Effect of edaravone on cerebral edema and lipid peroxidation in rats of cerebral hemorrhage

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    目的探讨依达拉奉对大鼠脑出血后脑水肿及脑组织氧化损害的影响。方法选取健康雄性清洁的SD大鼠150只,随机分为假手术组、对照组、治疗组,每组50只,分别于术后0.5、1、2、3、4 d 5个时间点对每组中不同10只进行观察。采用立体定向自体血注入法制作大鼠脑出血模型,检测3组并比较各时间点血肿周围脑组织含水量变化、丙二醛(MDA)含量变化及超氧化物歧化酶活力情况。结果假手术组和治疗组术后1~4 d各时间点血肿周围脑组织含水量均显著低于对照组(P<0.05);对照组在术后2d脑水肿达到最高值;假手术组、治疗组术后0.5~4 d各时间点血肿周围脑组织MDA含量均显著低于对照组(P<0.05);假手术组、治疗组术后0.5~4 d各时间点血肿周围脑组织SOD活力均显著高于对照组(P<0.05)。结论依达拉奉能明显改善脑出血大鼠血肿周围脑组织水肿,减轻脑出血大鼠脑组织氧化损害。Objective To discusse the effect of edaravone for brain tissue oxidative damage after cerebral hemorrhage through observing the hemorrhage rats back edema and the change of lipid peroxidation. Methods 150 healthy and clean male SD rats,were randomly divided to sham operation group,control group,treatment group,50 cases in each group,each group choose five time points,post operative 0. 5 day,1 day,2 days,3 days,4 days,observed different 10 rats at each time point. The intracerebral hemorrhage model was made by using the method of stereotactic autologous blood injection. The changes of water content,the content of MDA and the activity of superoxide dismutase were monitored in three groups at different time points. Results Surrounding the hematoma in the brain tissue around the hematoma after intracerebral hemorrhage in sham operation group,treatment group of postoperative day 1-4 days each time hematoma surrounding brain tissue water content was significantly lower than that in control group( P <0. 05); Control group after 2 days of cerebral edema and reached the highest value; Sham operation group and treatment group of postoperative half of the day to 4 days each time the content of MDA were significantly lower than in control group( P < 0. 05); Sham operation group and treatment group postoperative half of the day to 4 days each time the brain tissue SOD activity was significantly higher than control group( P < 0. 05). Conclusion The effect is obvious that edaravone for cerebral hemorrhage rats brain tissue around hematoma edema,reduce cerebral hemorrhage rat tissue oxidative damage.福建省医学创新课题项目(2015-1-85

    中国各地区人口特征和房价波动的动态关系

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    本文分析了人口特征、金融市场和房地产市场三者的相互影响机制,基于2002-2015年我国大陆31个省、自治区、直辖市的年度数据,建立了面板平滑转换模型,将人口密度作为异质变量构建计量模型,研究房地产市场的非线性影响因素,及各地区人口特征对房价波动的影响机制。实证结果表明:人均GDP对房价的影响随人口密度增加呈现非线性提升效应;人口密度小的地区,M2存量对房地产价格有正向影响;当人口密度较小时,地区中老年人口占比越大,房价下降的可能越大,反映了房地产\"年轻人推动房价上涨\"的现象,但是极少人口密度比较大城市例外

    全球化背景下国家主权让渡的博弈分析

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    博弈论作为一种不可或缺的方法论,是目前探讨国际机制的一种有效理论工具。本文采用这个观点,就经济全球化下规则的制订对国家主权的影响提出自己的看法

    Perfect our Country's Road Traffic Accident Spiritual Damage Compensation System

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    近几年,随着机动车数量的增加,道路交通事故案件逐年上升。在道路交通事故中,交通事故的肇事方侵犯的主要是被侵权人的财产权和人身权。对人身权利的损害,即侵权人侵害他人人身权利的行为,这种侵权行为给被侵权人造成的损害既包括物质方面的,也包括精神方面的。迄今,精神损害可获得金钱赔偿的理念,已经为大多数国家或地区的理论界和司法界所接受,我国也不例外。但精神损害的无形性却决定了它很难准确地计算和评估,更难以确定一个统一的评定标准,因此,精神损害赔偿制度的缺陷也在所难免。 本文从分析一般精神损害赔偿的理论入手,结合道路交通事故的特点,进而分析道路交通事故精神损害赔偿的概念、主体、适用范围、归责原则等,结合...In recent years, with the number of vehicles increases, the road traffic accident cases is rising year by year. In road traffic accidents, traffic accidents hit-and-run party of infringement mainly is the infringement of the property rights and personal right. The damage of personal rights, namely the infringer infringement of personal rights behavior, this kind of infringement by the infringer to...学位:法律硕士院系专业:法学院法律系_法律硕士(JM)学号:X200812010

    Study on the Development Strategy for A Valve Company

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    流体控制行业是通用机械的重要分支,是国民经济建设的重要装备制造业。阀门作为流体控制的关键设备在国民经济建设中无处不在。虽然我国民营企业在阀门行业的发展中取得了一定成绩,但是规模普遍比较小,产品研发能力弱。 面对当前日趋激烈的市场竞争环境和行业发展机遇,作为阀门行业后起之秀的A流体控制公司在此背景下,如何加快发展,提升持续竞争力,从而在竞争日益激烈的市场中站稳脚跟、健康成长成为我们面临的当务之急。本文在对企业战略理论进行梳理的基础上,采用PEST分析、产业结构模型——五力分析模型、SWOT分析等工具,结合公司所处行业和外部环境进行研究,同时对公司生产能力、技术水平及主要财务情况等内部环境因素进...Fluid control industry is an important branch of general machinery, is an important equipment of national economic construction of manufacturing industry. The valve is a key equipment in the fluid control in the national economy construction everywhere. Although China's private enterprises have achieved certain results in the development of the valve industry, but the scale generally relatively sm...学位:工商管理硕士院系专业:管理学院_工商管理硕士(高级管理人员工商管理硕士)学号:X201315626
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