18 research outputs found

    厦门大学图书馆人文社科实验室的实践与启示

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    以厦门大学图书馆区域研究资料中心的实践为例,通过社会网络分析,指出阅览室可以成为大舞台。说明了调整社会网络,就能创新;联合专业人士,更有效地完成专业服务;在动态中谋求发展。展望了新阅览室服务大戏

    动脉粥样硬化性肾动脉狭窄的早期发现

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    探讨冠状动脉造影同时行肾动脉造影的必要性及动脉粥样硬化性肾动脉狭窄的相关危险因素分析。共 4 91例临床疑似冠心病患者行冠状动脉造影同时行非选择性或选择性肾动脉造影 ,并对相关的临床因素进行评价 ,筛选出动脉粥样硬化性肾动脉狭窄的独立危险因素。冠心病组患者中动脉粥样硬化性肾动脉狭窄的发病率为2 0 % ,显著高于非冠心病组 (2 .6 % )。冠心病、外周血管疾病是动脉粥样硬化性肾动脉狭窄的独立危险因素 (多元Logistic回归分析示 ,P <0 .0 0 1、P =0 .0 0 3) ,是其早期发现的指标。对怀疑有冠心病的患者 ,在冠状动脉造影同时行肾动脉造影有助于动脉粥样硬化性肾动脉狭窄的早期发现

    煤程序升温与等温热解特性及动力学比较研究

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    采用热重分析仪和微型流化床分别考察了不同煤阶五个煤样的程序升温和等温快速热解的挥发分析出特性和反应动力学.程序升温实验揭示了热解气体的析出顺序依次为CO2,CO,CH4和H2,而等温热解实验证明CO2和CO的析出先于CH4和H2.微型流化床等温快速热解的挥发分气体总量析出活化能为17kJ/mol~35kJ/mol,小于程序升温热解的活化能.CO2和CO的反应级数与1接近,而CH4和H2的反应级数与1偏差较大,反映了这两类气体在生成机制上存在差异

    煤程序升温与等温热解特性及动力学比较研究

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    采用热重分析仪和微型流化床分别考察了不同煤阶五个煤样的程序升温和等温快速热解的挥发分析出特性和反应动力学.程序升温实验揭示了热解气体的析出顺序依次为CO2,CO,CH4和H2,而等温热解实验证明C02和CO的析出先于CH4和H2.微型流化床等温快速热解的挥发分气体总量析出活化能为17kJ/mol~35kj/mol,小于程序升温热解的活化能.C02和CO的反应级数与1接近,而CH4和H2的反应级数与1偏差较大,反映了这两类气体在生成机制上存在差异

    Dynamic Parameters Test of Micro-Machined Gyroscope Based on LabVIEW

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    针对当前测试微机械陀螺动态参数存在耗时长、效率低等缺点,提出了一种新的测试陀螺动态参数的方法,该方法通过lAb-VIEW编写的测试软件控制一数据采集卡和信号调理电路激励陀螺振动并采集其驱动方向上的振动数据,从采集的振动数据中提取出波峰和波谷进行指数拟合获取陀螺的衰减系数和固有频率,最后根据阻尼振动方程计算出陀螺的阻尼比和谐振频率,同时获取陀螺的品质因子;该方法能够实现自动记录和处理陀螺的振动数据;整个测试过程只需15S左右,提高了测试效率;利用该方法测试了30种不同气压下陀螺的品质因子,得到的陀螺的品质因子与气压值的关系曲线和理论研究结果相符,从而为陀螺动态参数的测试提供了一种有效的手段。For the current method test dynamic parameters of Micro-machined Gyroscope has some defects,such as time-consuming and low efficiency,a new method test dynamic parameters of gyroscope is put forward in this paper,this method control a data acquisition card and signal regulate circuit to drive gyroscope vibrate and collect the vibration data on the drive direction of gyroscope by a test software written in the LabVIEW,then extract peaks and troughs from the vibration data to get the attenuation coefficient and the inherent frequency of gyroscope through index fitting,finally calculated the damping ratio and the resonant frequency of gyroscope according to the damping vibration equation and get the quality factor at the same time.The method can realize recording and processing the vibration data of gyroscope automatically.The entire testing process takes about 15 seconds,so this method has improved the test efficiency.Using this method tested the quality factor of the gyroscope in 30 different pressure,the relation curve of quality factor and the pressure value is conform to the theoretical results,thus this paper provide an effective means for the dynamic parameter test of gyroscope.航空科学基金(20110868001

    ~(18)O~(8+)离子辐照胸腺嘧啶N_2O饱和水溶液产物的分析

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    利用UV、HPLC、GC、GC-MS、GC-FT-IR等分析仪器对中能~(18)O~(8+)离子辐照胸腺嘧啶N_2O饱和水溶液进行了分析,对羟基加成产物、二聚体等十几种产物进行了鉴别,计算了各种产物的G值,对重离子辐照与γ射线辐照的结果进行了比较,最后对重离子作用机制进行了探讨.The products of thymine (T) irradiated by 18O8+ ion beam in N2O saturated aqueous solution was studied. The apparatus of Ultraviolet spectrometiy (UV), high perfonnance liquid chrornatography (HPLC) , gas chromatography (GC) , gas chromatography-rnass spectrometry (GC-MS) and gas chromatography-Fourier transform infrared spectroscopy (GC-FTIR) were used to analyze the products. The hydroxy and hydro adducts and dimers were determined. The G values of products were calculated. The damage of the irradiation o...中国科学院院长青年创新基金资助项

    重离子辐照胸腺嘧啶产物的毛细管气相色谱分析

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    对经中能的18 O8+ 离子辐照过的胸腺嘧啶 N2 O 饱和水溶液进行了研究,利用气相色谱( G C)、气相色谱质谱联用( G C M S)、气相色谱红外光谱联用( G C F T I R)等仪器对辐照后的产物进行了分析、鉴别,观察到了 5,6二氢胸腺嘧啶、5羟基5甲基乙内酰脲、5羟基(氢)6(氢)羟基胸腺嘧啶、5羟甲基尿嘧啶、顺(反)胸腺嘧啶二醇和二聚体等产物。虽然重离子主要是通过辐照水溶液中产生的羟基、氢原子等对胸腺嘧啶分子产生了作用,但与 γ射线作用机制和结果是不同的。γ射线辐照后主要产生的是二聚体产物,而重离子辐照后主要产物却是羟基加成产物。In this study some chromatographic methods with capillary column,such as GC, GC\|MS,GC\|FTIR,were used to analyze the products of thymine irradiated by 18 O 8+ ion beam in N\-2O saturated aqueous solution. Because of the complexity and small amounts of the products after irradiation by heavy ion beams, it is very difficult to separate them,while with the methods of capillary gas chromatography this problem can be overcome. From the results of GC\|MS analysis we can determine the molecular weight ...中国科学院院长青年创新基

    ~(18) O~(8+) 离子辐照胸腺嘧啶 N_2O饱和水溶液的研究

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    研究 了中能18 O8 + 离子束辐 照胸腺 嘧啶 N2 O 饱和 水溶 液 时重 离子 对 胸腺 嘧啶 的 影响 ,利用 U V、 H P L C、 G C、 G C M S、 G C F T I R 等仪器 对产 物 进行 了 分析, 对羟 基 加成 产 物、二 聚 体 等十几种 产物进行 了鉴别, 测得不同 辐照剂 量下胸腺 嘧啶的 G 值 分别为02 4 和114 ;对重离 子辐照与γ射 线辐照 进行了比 较。In this paper thymine (T) irradiated by 18 O 8+ ion beam in N 2O saturated aqueous solution was studied The apparatus of Ultraviolet (UV), High Performance Liquid Chromatography (HPLC), Gas Chromatography (GC), Gas Chromatography Mass Spectrometry (GC MS) and Gas Chromatography Fourier Transformation Infrared (GC FT IR) were used to analyze the products The hydroxy and hydro adducts and dimers were determined The G values of products were calculated The damage of the irrad...院长青 创新基

    EFFECT of ALUMINUM ON GLUTAMATE UPTAKE IN RAT BRAIN SYNAPTOSOME.

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    f904 是从微生物代谢产物中提取分离出来的具有高活性的免疫抑制剂.利用多种核磁共振技术对f904 在CdCl3 中的1 H 和13 C nMr 谱峰进行归属,推出其分子骨架结构,并利用变温13C{1H} nMr谱研究其在溶液中的动态结构.实验结果表明,f904 与新型免疫抑制剂rAPAM yCIn 的结构一致国家自然科学基金!(19605004);福建省自然科学基金!(9910001);九五药物攻关资
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