pH对隐丹参酮和丹参酮A的荧光特性及分子结构影响研究

考察研究了丹参主要有效成分隐丹参酮和丹参酮 A在不同酸性介质中的荧光特性。结果表明隐丹参酮和丹参酮 A均有很宽的 p H发光范围 ( p H=1- 11)。在 p H=2 - 3时 ,隐丹参酮和丹参酮 A荧光发射最强。在强酸 ( 5mol/L HCl)和强碱 ( 2 mol/L Na OH)介质中隐丹参酮和丹参酮 A的荧光均被显著猝灭 ,同时荧光光谱发生明显蓝移。表明隐丹参酮和丹参酮 A在强酸强碱下分子结构发生了明显变化。从而为它们的药理及其理化性质等的研究提供了分子结构信息等的依据     

Dynamic vertical interaction of a foundation–soil system generated by seismic waves

Based on Biot's dynamic poroelastic theory, a foundation–soil interaction model is established to investigate the vertical vibrations of a rigid circular foundation on poroelastic soil excited by incident plane waves, including the fast P waves and SV waves. Scattering waves caused by the foundation and fluid–solid coupling due to the pore water in the soil are also considered in the model. The solution of the vertical vibrations of the foundation subjected to seismic waves are obtained by solving two sets of dual integral equations derived from the mixed boundary-value conditions. The different vertical vibrations of foundation rest on elastic and saturated half-space are compared. The influences of incident angle, permeability of soil and foundation mass on the vertical vibrations of the foundation are then discussed. The results show that resonant phenomenon of the foundation is observed at certain excitation frequencies; the effects of the pore water on the foundation vertical vibrations are significant. In addition, significant differences are found when the foundation is excited by P waves and SV waves, respectively.     

Surface modification and characterization of magnesium hydroxide sulfate hydrate nanowhiskers

In order to enhance the compatibility with plastic polymers, magnesium hydroxide sulfate hydrate (MHSH) nanowhiskers were modified through grafting methyl methacrylate (MMA) on the surface of the nanowhiskers by emulsion polymerization. The influences of the reaction time, MMA monomer content, adding speed of monomer and the reaction temperature on the grafting ratio were investigated. Thermogravimetry (TG), Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray (EDX) spectroscopy and surface contact angle measurement were used to characterize the effect of surface modification. The results showed that the MHSH nanowhiskers were uniformly coated by polymethyl methacrylate (PMMA), and a well-defined core-shell hybrid structure of MHSH/PMMA was obtained. The surface contact angle of the hybrid whiskers increased to 87.32° from 12.71° and the whiskers surface was changed from hydrophilic to lipophilic.     

基于GEANT4的CsI(T1)闪烁体探测器的Monte Carlo模拟

对闪烁光在晶体内的传输以及光电子倍增过程进行了建模,基于GEANT4软件包对CsI(T1)闪烁体探测器进行了蒙特卡罗模拟,得到了不同形状、尺寸和包装的CsI(T1)晶体测量γ射线的能谱.对比模拟和测试结果,两者得到了很好的符合,从而验证了模拟参数的合理性和可靠性.该模拟程序的建立为闪烁体探测器的设计提供了更精确的开发工具.     

浙江新昌早白垩世盆地中硅质岩石的地球化学特征与成因

在浙江新昌早白垩世盆地西侧的馆头组中，存在一些硅质岩石－－块状硅质岩、含叠层石硅质岩和木化石硅质岩等，它们以高SiO2、富Fe2O3、低Al2O3和TiO2为特征，REE含量低，而且有弱的Ce亏损，δ^30Si值为－0．4‰－-1.5‰，δ^18O值为18．1％－23．1‰。硅质岩的地球化学研究表明它们具有热水硅质岩的特点。结合其它地质资料，作者讨论了这些硅质岩的硅质来源和成因，认为它们系地表水和海水向下渗透，并在一定深度内发生循环然后上涌，火山活动为热水提供热源，SiO2来源于热水流经的地层和岩石。富含SiO2的热水溶液在适当的地方沉淀形成块状或透镜状硅质岩，也可解释古树木和含叠层石灰岩形成木化石硅质岩和含叠层石硅质岩，根据氧同位素地质温度计计算出硅质岩形成时的热水温度为70．8－108．4℃。     

函数与其导数具有公共值的全纯函数族的正规性

设F为区域G上的全纯函数族, a,b(≠0)为两有穷复数,n为正整数,本文推广了Miranda定则,证明了:若对任意的f∈F,(a,b)为f与f(n)在G上的IM分担数组,且当f=a时, f'=f(n+1)=b,则F在G中正规.     

同步扫描－固体基质室温磷光法同时测定痕量对位三联苯和间位三联苯的研究

本文提出了一种新的测定间三联苯和对三联苯的同步扫描－ＳＳ－ＲＴＰ法。固体基质选用慢速定量滤纸，重原子盐为Ｔｌ２ＳＯ４。以激发单色器和发射单色器的波长差△λ＝１８０ｎｍ进行同步扫描，其同步特征峰间三联苯为４５０ｎｍ，对三联苯为４９０ｎｍ（均指发射波长）。间三联苯可直接由该特征峰的高度进行定量测定。对三联苯在４９０ｎｍ处的特征峰略受间三联苯同步拖尾的影响，其峰值信号需加校正。间三联苯和对三联苯的线性范围分别为０．４６～９２ｎｇ／斑点和０．４６～４６ｎｇ／斑点     

几丁质发酵液的生物活性

鞘氨醇单胞菌CJ-5菌株在以几丁质为碳源的培养基上生长,既产生几丁质酶又产生壳聚糖酶.利用其发酵液进行抑制真菌,促进植物生长等生物活性的研究及作用机理的探讨,发现CJ-5菌株的几丁质发酵液具有抑制番茄枯萎病菌,促进水稻扩叶生根的效果,显示了潜在的防治植物病原菌及促进植物生长的能力.     

技术创新与增长期权定价

本采用了净现值(NPV)和实物期权定价方法对一个实际的MMDS的发射放大器项目进行了定价，并对两种方法定价的结果进行了分析和对比。由于实物期权方法定价的结果包含项目中的增长期权和放弃期权的价值，因而实物期权方法定价的结果比NPV方法定价的结果更合理和更高。     

度量空间的k－映射像

Ｅ．Ｈａｌｆａｒ（［６］）引入了ｋ－映射概念，本文给出了度量空间ｋ－映像的一个内在刻划，并由此得到一些度量化定理。