双原子分子电子振动光谱的转动结构分析

本文分析了双原子分子电子振动光谱的转动结构规律,说明了如何对电子振转光谱进行标识,从而获得不同电子态的转动常数、转动惯量和核间距。     

磁场微极流方程组弱解的正则性准则

本文研究了三维空间中磁场微极流方程组弱解的正则性准则问题.利用能量估计的方法证明了如果速度场以及磁场满足一定的条件,则弱解在(0,T]是唯一的强解.     

Miniemulsion cross-linking: A convenient route to hollow polymeric nanocapsule with a liquid core

Miniemulsion stabilized by poly(2-(dimethylamino) ethyl methacrylate)-block-poly(butyl methylacrylate) (PDMAEMA-b-PBMA) diblock copolymers has been used as liquid templates for the synthesis of polymer nanocapsules via quaternization cross-linking of PDMAEMA segments of the copolymer by 1,2-bis(2-iodoethoxy)ethane (BIEE) crosslinkers. PDMAEMA-b-PBMAs here as a stabilizer in miniemulsion with different molecular weights led to a size variation in diameters of nanocapsules, demonstrating the capsules have potential design capability of this technique. The solution behavior of the capsules has been also investigated in this paper.     

CPA矩阵分光光度法同时测定苯二酚异构体

对吸收峰严重重叠的邻苯二酚、间苯二酚和对苯二酚3组份体系同时测定进行了研究。提出了3波长CPA矩阵分光光度法,即以283.5、279.5、276.5nm3波长为3种苯二酚的测量波长,按正交设计表L25（56）配制25组标准混合溶液,对3种苯二酚进行校正;同时测定了模拟混合样本中的邻苯二酚、间苯二酚和对苯二酚含量。测量结果表明,邻苯二酚在浓度8μg/mL时误差稍大,绝大部分分析结果相对误差小于5%,测量体系稳定,结果可靠。     

新型吡啶基羧酸席夫碱配体镍配合物的合成和晶体结构

通过新合成的吡啶基羧酸席夫碱配体（5-(吡啶基-3-亚甲基氨基)间苯二甲酸H2L）,和镍盐反应制备了一个新的镍配合物{[Ni(HL)₂(H₂O)₂]·2H₂O}_n(1),利用元素分析及X-射线单晶衍射对其进行了表征。结构分析结果表明标题化合物属于三斜晶系,P1 空间群,晶胞参数为a=0.764 79(11) nm,b=0.870 49(13) nm,c=1.081 13(16) nm,α=85.583(2)°,β=82.614(2)°,γ=81.565(2)°,V=0.704 82(18) nm³,Z=1,D_c=1.586 g·cm^-3,μ=0.763 mm^-1,F(000)=350。在配合物的结构中,Ni(Ⅱ)的配位构型为畸变的八面体。配合物中每个配体通过羧酸氧和吡啶氮原子和金属配位形成一维链状结构,并通过体系中丰富的氢键作用链接成为三维框架并加以稳定。     

Parametric effects of the potential energy function on the geometrical features of ternary lennard-jones clusters

The impact of parameters in potential function for describing atomic or molecular clusters is complex due to the complicated potential energy surface. Ternary Lennard-Jones (TLJ) A(l)B(m)C(n) clusters with two-body potential are investigated to study the effect of parameters. In the potential, the size parameter (σ(AA)) of A atoms is fixed, and corresponding parameters of B and C atoms (relative to A atoms), i.e., σ(BB)/σ(AA) and σ(CC)/σ(AA) > 1.00, are used to control the atomic interaction among A, B, and C atoms in TLJ clusters. The minimum energy configurations of A(l)B(m)C(n) clusters with different species are optimized by adaptive immune optimization algorithm. Ternary cluster structures, bonds, and energies of the putative minima are studied. The results show that two different structures based on double-icosahedra are found in 30-atom TLJ clusters. Furthermore, with increasing potential size parameters of B and C atoms, A atoms tend to be more compact for the increasing numbers of A-A bonds, but the short-range attractive part in TLJ clusters becomes weaker. To lower the potential energy, B and C atoms grow around the A atoms in pursuit of a compact configuration. The results are also approved in A(l)B(m)C(n) (l + m + n = 9-55) clusters and A(l)B(m)C(n) (l = 13, m + n = 42) clusters.     

等腰直角三角形膜的横振动方程的一个解析解

本文给出了占据等腰直角三角形区域的均匀膜的横振动方程在周边固定情况下的一个解析解,进一步讨论了解的某些性质.     

贯众多糖提取及其抗氧化作用

采用水提-醇沉法从贯众中提取多糖,脱脂、去蛋白,经冷冻干燥后得到粗多糖。通过比色法研究其体外清除羟基自由基能力。贯众多糖具有较好的清除.OH的能力,且其清除能力与多糖浓度有明显的量效关系。清除50%羟基自由基所需要的多糖浓度为3.9m g/mL。     

PAR分光光度法测定钴和镍

进行了用PAR分光光度法同时测定钴和镍的研究。在pH=5的NaAc-HAc缓冲溶液中,钴和镍可与显色剂4-(2-吡啶偶氮)间苯二酚(PAR)的溶液形成稳定的络合物,络合物的吸收光谱重叠相互干扰,经过实验确定以508.0、568.0nm作为钴(Ⅱ)、镍(Ⅱ)的测量波长,应用双波长线性回归法可同时测定。方法简单、快速、灵敏度高。