运用Poincaré-Miranda定理数值验证变分不等式解的存在性

本文运用Poincaré-Miranda定理数值验证变分不等式问题解的存在性.证明这一新方法相对于已有的方法更具有普遍性,并通过数值例子说明本方法的高效性.     

二(2-乙基己基)磷酸稀土配合物的红外和拉曼光谱

用稀土氯化物与二(2-乙基己基)磷酸反应制备了14种标题配合物,测定了配合物的红外和拉曼光谱,对其主要红外和拉曼谱带进行了归属.结果表明,Ln(DEHP)3应具有与Sm(DMP)3和Pr(DMP)3相同的配位形式和结构类型,每个稀土离子通过双O-P-O桥与邻近的三个稀土离子相连接,形成"双桥二十四元环"的多聚网络结构.Ln-O键基本上是离子键.     

原子吸收光谱法测定铅蓄电池板栅中锡、钙和铝

通过先加酒石酸、硝酸溶解样品,用氧化镧、EDTA联合掩蔽铝来测定钙,盐酸沉淀铅后测锡、铝的试验,采用火焰原子吸收光谱法测定锡、钙和铝.     

电感耦合等离子体发射光谱法定量测试明胶中的微量金属元素Hg和Rh--应用MSF模型改进Hg结果的精密度和检测限

应用电感耦合等离子体发射光谱技术,建立了定量测试明胶中微量金属元素Hg和Rh的方法。采用湿法消解对明胶样品进行前处理。讨论了ICP-AES同时测定明胶中微量金属元素Hg和Rh时,应用MSF模型校正对汞的光谱干扰和背景干扰,改善了检测结果的精密度和检测限。实验结果表明,建立的方法准确、快速、高效、线性范围宽,得到的分析结果令人满意。     

基于SPR光谱分析的液体折射率测量研究

文章从电磁场理论和射线理论的角度,详细讨论了光纤表面等离子体波传感器工作原理,分析了表面等离子体共振(SPR)光谱共振波长与液体介质折射率之间的对应关系。采用相关光谱检测技术,获得八种不同类型分析醇所对应的SPR光谱曲线族,其共振波长随液体折射率的增大而逐渐向长波长方向偏移。通过对乙醇与乙二醇混合液体所对应的共振光谱分析,实现对两者配比浓度的测定。整个传感系统结构简单,测量光路部分实现全光纤化,不仅能够对目标测量介质的实时、快速、精确测量,还可用于特殊测量场合,实现远程遥测功能。     

富硒蛹虫草中硒多糖的分离与分析

在对人工栽培的富硒蛹虫草中分离提取了水溶性硒多糖,富硒蛹虫草硒多糖的分离纯化方法是采用水提醇沉工艺,粗硒多糖得率为5.76%。系统研究了富硒蛹虫草硒多糖的浸提、纯化、分离条件,苯酚硫酸法测定了富硒蛹虫草的多糖含量为47.5%,分子荧光法测定硒多糖中含硒量为92.3 mg·kg-1。     

荧光法研究牛血清白蛋白与三羟基苯基荧光酮-钼(Ⅵ) 配合物探针的作用机理

用荧光光谱法研究了三羟基苯基荧光酮(TH-PF)-钼(Ⅵ)配合物与牛血清白蛋白的结合反应。探讨了TH-PF-Mo(Ⅵ)配合物对蛋白质内源荧光的猝灭机理,并测定了不同温度下的结合常数,温度为25 ℃时,荧光猝灭法测得该反应的结合常数为K=4.78×104 L·mol-1,温度为40 ℃时,荧光猝灭法测得该反应的结合常数为K=3.72×104 L·mol-1。根据Frster非辐射能量转移理论,确定了给体-受体之间的作用距离和能量转移效率(E=0.314),并根据热力学参数确定了TH-PF-Mo(Ⅵ)配合物与牛血清白蛋白之间的作用力类型,以静电引力为主。     

非线性拉曼激光雷达测量CO2气体的研究

提出了利用气体的受激拉曼散射(SRS)效应激光雷达光源来探测大气中的CO2气体的新方法,设计出探测大气中CO2气体含量的非线性拉曼增益激光雷达,用Nd:YAG激光器(1064 nm)的三倍频光(354.7 nm)通过分别装有CO2气体和N2气体的拉曼管,分别得到CO2气体和N2气体的受激拉曼散射的一阶斯托克斯线(S1),并用S1线作为雷达的种子发射光源.通过实验得到拉曼管中的气压与S1能量的变化关系,对其优化条件和物理机制进行了分析.该实验方法已经成功测出了大气中CO2气体的回波电压信号.     

Porphyrin-like porous nanomaterials as drug delivery systems for ibuprofen drug

In recent years, nanomaterial-based drug delivery carriers have become some of the most attractive to be studied. The purpose of this study is to investigate the interaction of C60 fullerene, carbon nanotube and graphene having porphyrin-like FeN4 clusters with a non-steroidal anti-inflammatory drug (ibuprofen) by means of the density functional theory. Results showed that the graphene with FeN4 clusters could remarkably increase the tendency of graphene for adsorption of ibuprofen drug. Also, our ultraviolet–visible results show that the electronic spectra of the complexes exhibit a blue shift toward lower wavelengths (higher energies). It was found that Ibp/FeN4-graphene had high chemical reactivity, which was important for binding of the drug onto the target site. In order to go further and gain insight into the binding features of considered systems with ibuprofen drug, the Atoms in Molecules analysis was performed. Our results determine the electrostatic features of the Ibp/FeN4-graphene bonding. Consequently, the results demonstrated that the FeN4-graphene could be used as potential carriers for the delivery of ibuprofen drug.     

Influence of Electron–Phonon Interaction on the Lattice Thermal Conductivity in Single-Crystal Si

Lattice thermal conductivity can be reduced by introducing point defect, grain boundary, and nanoscale precipitates to scatter phonons of different wave-lengths, etc. Recently, the effect of electron–phonon (EP) interaction on phonon transport has attracted more and more attention, especially in heavily doped semiconductors. Here the effect of EP interaction in n-type P-doped single-crystal Si has been investigated. The lattice thermal conductivity decreases dramatically with increasing P doping. This reduction on lattice thermal conductivity cannot be explained solely considering point defect scattering. Further, the lattice thermal conductivity can be fitted well by introducing EP interaction into the modified Debye–Callaway model, which demonstrates that the EP interaction can play an important role in reducing lattice thermal conductivity of n-type P-doped single-crystal Si.