2-氰基-4’-甲基联苯的合成研究

沙坦类药物时一类作用机制新颖、疗效确切且副作用小的新型抗高血压药物,在高血压药物市场中占据了重要的地位,具有广阔的市场开发前景[1].2-氰基-4'-甲基联苯(OTBN)是制备沙坦类抗高血压药物的关键中间体,其主要合成方法有多步合成法、芳构化闭环合成法和催化一步合成法.多步合成法生成了大量的废物,生产综合费用高[2];芳构闭环合成法,由于受到原料的限制则仅具有实验室研究价值[3];而催化一步合成法则具有效率高、选择性好、副产品少、污染物少、设备投入少、原料价廉易得等优点,是较为理想的工业生产方法,受到很大的关注.     

Z箍缩靶用聚合物丝的弛豫特性

 聚苯乙烯（PS）,聚乙烯（PE）及其的氘代物是Z箍缩驱动惯性约束聚变（ICF）实验中的重要固体燃料容器材料,针对物理实验对其形状的特殊要求,利用高压毛细管流变仪及HAUL-OFF熔体拉伸测试单元进行熔融纺丝,制备出直径为30～100 μm的聚合物丝样品。通过对PS,PE以及氘代聚苯乙烯（DPS）丝的力学弛豫性质研究发现：在相同的恒定应力下,实验用PS丝的蠕变量明显小于PE丝,PS丝表现出更好的尺寸稳定性;当定伸长为1％时,PS丝的松弛率明显小于PE丝;DPS丝的蠕变及应力松弛行为与PS丝具有相同的变化趋势。     

Investigation of sulfur speciation in particles from small coal-burning boiler by XANES spectroscop

Sulfur K-edge X-ray absorption near-edge structure （XANES） spectroscopy was employed to study the speciation of sulfur in raw coal, ash by-product and fine particulate matter from a small coal-burning boiler. By means of least square analysis of the XANES spectra, the major organic and inorganic sulfur forms were quantitatively determined. The results show that about 70% of the sulfur in raw coal is present as organic and a minor fraction of the sulfur occurs as other forms： 17% of pyrite and 13% of sulfate. While in bottom ash, fly ash, and PM2.5, the dominant form of sulfur is sulfate, with the percentage of 80,79 and 94, respectively. Moreover, a number of other reduced sulfur including thiophenic sulfur, element sulfur and pyrrhotite are also present. During coal combustion, most of organic sulfur and pyrite were oxidized and released into the atmosphere as SO2 gas, part of them was converted to sulfate existing in coal combustion by-products, and a small part of pyrite was probably reduced to elemental sulfur and pyrrhotite. The results may provide information for assessing the pollution caused by small boiler and developing new methods for the control of SO2 pollution.     

Characteristics of element concentration of daytime and nighttime PM2.5 in the suburbs of Shanghai using Synchrotron XRF

The characteristics of daytime and nighttime suburbs PM_2.5 in Shanghai were analyzed by synchrotron based X-ray fluorescence during the period of October, 2006 and November, 2007. The mass concentrations of nighttime PM_2.5 was approximately two times that of daytime PM_2.5. Some elements, such as Zn, Cu, Mn, Cl were found enriched at night. The local sources might have significant contribution to the nighttime PM_2.5 pollutions.     

铅染毒大鼠骨中元素微区分布及相关性研究

北京同步辐射装置上的同步辐射X射线探针被用于测定铅染毒大鼠骨中铅和其它元素微区分布,结果发现: 铅主要分布在密质骨内、外边缘, 而锌主要分布在密质骨和密质骨边缘. 同时,钙、磷、锶和铁的分布也同时获得.     

聚丙稀酰胺凝胶基体中蛋白条带内金属含量的同步辐射X荧光定量分析

建立了同步辐射X荧光(SRXRF)定量分析人血红蛋白等电聚焦(IEF)分离后聚丙烯酰胺凝胶基体中蛋白条带内Fe的方法.用组成基本相同的浓缩胶将铁含量已知的牛血清白蛋白电泳成单一条带作为定量标准,得到SRXRF测定凝胶基体中蛋白 条带铁含量的校准曲线,其线性回归系数R²在0—5.1ng Fe范围内为0.9897,在本实验条件下检出限为0.63ng,对人血红蛋白电泳分离后蛋白条带内铁含量测定的回收率约为106%,该联用技术可用于生物样品蛋白质中微量元素的分布研究,可同时给出蛋白质的微量元素组成和等电点等信息.     

微分析标准物质最小取样量的SRXRF研究

微分析技术在诸多科学领域发挥了重要作用,样品的分析区域越来越细化,分析的样品量越来越低,我国有证标准物质的最小取样量为100mg,在微分析实验中难以实现定量分析和实施分析质量控制,已成为微分析中需要解决的问题.将经过高温处理的土壤进行反复研磨和处理,达到99%的粉末通过500目筛子,用同步辐射X荧光(SRXRF)进行了元素分布均匀性和最少取样量分析,SRXRF分析结果表明8个元素(K,Ca,Ti,Mn,Fe,Zn,Rb,Sr)的最少取样量可以降到1mg,在5%的相对标准偏差范围内能够获得稳定的数据.     

量化Domain中的模糊收敛与伴随映射

研究LF-偏序集中模糊集的并,广义Zadeh函数与LF-伴随映射之间的关系,证明了由LF-左伴随映射提升的广义Zadeh函数一定保任意模糊集的并,该结果是经典偏序伴随理论一个著名结论(左伴随保任意并)的量化/模糊推广.     

利用新教材让学生亲历物理

教材是学生学习的根本,是学生各种知识来源的主渠道．人教版普通高中课程标准实验教科书《物理》吸取了中外教材编写的一些有益经验,在版面设计、编写体例、内容等方面呈现出新的特点,这些变化必然对我们的教学产生影响．我们要充分利用教材,引导学生亲历物理,学好物理,运用物理知识解决实际问题,培养物理思维能力．     

LECR2离子源的改造及初步运行结果

The Latest developed LECR2M (Lanzhou ECR No.2 Modified)source is the updated one of LECR2(Lanzhou ECR No.2)source at IMP.It has been assembled on the low energy ion beam experimental platform to produce MCI beams for atomic physics and material pllysics experimental research.In our updating program,the structure of injection and extraction components has been modified to make the source structure more simple and effective.The hexapole magnet has also been replaced by a new hexapole magnet with higher radial field and larger inner diameter.With this updating,stronger magnetic field confinement of the ECR plasma is possible and better base vacuum condition is also achieved.LECR2M was designed to be operated at 14.5GHz.During the preliminary test.1.3emA O6 beam was extracted with the injected rf power of 1.1kW.The source has been used to deliver intense MCI beams for different experiments.After some discussion of the main features of this newly updated source,some of the typical commissioning test results of LECR2M will be presented.