石墨炉原子吸收光谱法测定催化有机残液中的微量铑

硝酸于聚四氟乙烯闷罐中消解样品 ,石墨炉原子吸收光谱法测定催化有机残液中的微量铑 ,相对标准偏差为 6 .2 %,回收率为 96 .5 %— 1 0 5 .4 %。方法简便、快速 ,分析结果令人满意。     

流动注射在线离子交换柱富集-火焰原子吸收光谱法测定钨矿中的铜、锌和铅

建立了流动注射在线离子交换柱富集-火焰原子吸收光谱法测定钨矿中的铜、锌和铅的方法,样品经盐酸和硝酸分解后,加入5%宁可辛溶液使样品中大量的钨呈钨酸析出,样品中一般的伴生元素都可形成可溶性化合物与钨酸分离,之后采用流动注射在线富集与原子吸收联用技术,分别加入浓度依次递增的3种元素的标准溶液,用空气-乙炔火焰原子吸收连续测定Cu、Zn和Pb的含量。建立了优化的仪器工作条件,并对可能存在的元素进行干扰试验。方法检出限Cu为0.001μg/mL、Zn为0.001μg/mL、Pb为0.01μg/mL,相对标准偏差Cu为2.7%、Zn为3.6%、Pb为1.9%,加标回收率为96%—106%。     

黄花倒水莲与六月雪中6种金属元素的测定

本文采用火焰原子吸收光谱法对中草药黄花倒水莲、六月雪中茎部的Ca、Zn、Mn、Mg、Fe、Cu的含量进行了测定,方法简单、精密度好,回收率在93%—100%之间,结果令人满意。     

飞秒激光微细加工中光耦合器参数的数值模拟

用有限差分迭代求解光束传输方程,对1×2(Y型)耦合器和2×2(X型)耦合器分路的夹角大小对分路中光束分配比例的影响进行了模拟研究.模拟结果显示：耦合器夹角控制在一定的范围内,对分路中光束能量分配影响不大;2×2耦合器对分路夹角以及波导宽度的变化敏感.为飞秒激光加工光纤无源器件的可行性做了理论上的分析.     

平面光波导器件时域有限差分束传输法分析中边界和初始条件的处理

从慢变包络（SVEA）时域光传输方程出发,对比了综合道格拉斯（GD）和传统的中心差分（CN）两种离散化格式,指出GD法比CN法精度有了很大提高.重点讨论了GD法的TD-BPM边界处理问题,给出了吸收边界和透明边界离散的显式和隐式表达式,分析并确定了交替方向隐式法（ADIM）的边界处理方式;同时,对激励源加入的连接边界进行了仔细讨论.结果表明对于隐式GD-TD-BPM法边界处理应采用隐式,中间激励更能反映光波导反射场的情况.     

DMRG Studies on Properties of Undoped and Doped Molecule-Based Ferromagnetic Chain

By using density matrix renormalization group （DMRG） method a model for organic molecule-based ferromagnetic chain is proposed. It is found that the ground states of Undoped and doped systems both exhibit ferrimagnetic ordering. The e-e repulsion plays an important role in the stability of the ferromagnetic state either in doped system or undoped system. For the undoped system, each unit cell coatains half of the total spins, which is consistent with Lieb＇s theorem. It is convinced that when the system is doped with one electron, a charge density wave is excited, which decreases the amplitude of spin density wave,therefore acting against the stability of ferromagnetic state.     

A Facile Synthesis of Silver-Coated Composite Particles by Swelling Surface Method

We report a facile and rapid method for fabrication of composite particles consisting of a polystyrene (PS) core and a uniform silver shell. The process involves the PS colloid surface swelling, the anchoring of silver ions and nanoparticles onto the surfaces, and the subsequent growth of metal seeds in a short period. The present approach has the advantages of simplicity and high efficiency. The TEM images show the morphology of the obtained PS core-silver shell particles, and their chemical composition and crystallinity are analysed by x-ray diffraction. To our knowledge, this is the first study based on swelling PS surface for synthesis of silver-coated PS particles and may be implemented for preparing other metal-coated PS particles.     

Effect of the Initial Mass Function of Primaries on Binary Stellar Populations

Using evolutionary population synthesis technique, we explore the behaviour of the integrated U-B,B-V, V-R and R - I colours, the integrated spectral energy- distributions (ISEDs) and Lick/IDS absorption-line indices of instantaneous burst solar-metallicity binary stellar populations, as a function of the initial mass function (IMF)of primaries. It is found that the variation of the IMF of primaries produces a small effect on the integrated colours and the Lick/IDS indices, while a significant difference in the absolute ISEDs.     

离散的五次非线性薛定谔方程的精确孤子解

利用推广的双曲函数法，我们研究了离散的五次非线性薛定谔方程。当方程的系数满足某种约束关系时，我们得到了新的局域解。这些解包括亮孤子解，暗孤子解，相位交替变化的亮孤子解和相位交替变化的暗孤子解。     

紫外-可见吸收光谱法现场监测聚苯胺的电化学降解

采用紫外-可见吸收光谱法现场监测了苯胺电化学聚合时的动力学降解过程,简单、直观地显示了阳极电位、酸度和苯胺浓度对降解过程的影响,结果表明,阳极电位越正、酸度越强、苯胺浓度越大,聚苯胺的降解速度越快。该方法得到的结果与聚苯胺膜在空白溶液中采用循环伏安法研究其降解动力学时得到的结果类似。