气体膨胀液体技术制备纳米微粒研究进展

近年来,利用气体膨胀液体的相行为已经开发了许多气体膨胀液体微粒制备方法,并已在制备无机、有机材料、有机金属固体、医药、电子等方面的微细颗粒方面得到广泛应用。本文介绍了气体膨胀液体制备纳米颗粒的研究和应用进展。     

求解含有高阶导数偏微分方程的局部间断Petrov-Galerkin方法

构造一类求解三种类型偏微分方程的间断Petrov-Galerkin方法.求解的方程分别含有二阶、三阶和四阶偏导数,包括Burgers型方程、KdV型方程和双调和型方程.首先将高阶微分方程转化成为与之等价的一阶微分方程组,再将求解双曲守恒律的间断Petrov-Galerkin方法用于求解微分方程组.该方法具有四阶精度且具有间断Petrov-Galerkin方法的优点.数值实验表明该方法可以达到最优收敛阶而且可以模拟复杂波形相互作用,如孤立子的传播及相互碰撞等.     

Structural Characterization of Di- and Mono-Imidazolyl-Substituted 1,8-Naphthyridine Derivatives

Abstract  Two imidazolyl derived 1,8-naphthyridine compounds (2,7-diimidazolyl-1,8-naphthyridine (a), and 2-benzimidazolyl-5,7-dimethyl-1,8-napthyridine (b)) were synthesized and structurally characterized by X-ray crystallography. The compound a co-crystallizes with one ethanol and two water molecules to give compound 1. Compound 1 crystallizes in the triclinic, space group P-1, with a = 6.943(2) ?, b = 9.009(3) ?, c = 13.760(3) ?, α = 96.793(2)°, β = 97.431(3)°, γ = 107.080(2)°, V = 804.6(4) ?³, Z = 2. Compound 1 forms a 3D interpenetrated network through hydrogen bonds. Compound b co-crystallizes with three and one half water molecules to form 2. Compound 2 crystallizes in the monoclinic, space group C2/c, with a = 24.926(8) ?, b = 10.608(3) ?, c = 16.751(5)?, β = 110.133(4)°, V = 4159(2) ?³, Z = 8. The free water molecules form six-membered rings, these water rings connect the naphthyridine to form one dimensional chain when viewed from b axis. The naphthyridyl rings in a and b axis are connected through C–H···π, and π–π interactions, due to the weak interactions the compound shows 3D network structure. Graphical Abstract  Due to the weak interactions, the naphthyridine derivatives showed 3D network structure.      

AN ANALYSIS OF A CYLINDRICAL THIN SHELL AS A PIEZOELECTRIC TRANSFORMER

The vibration of a circular cylindrical piezoelectric ceramic shell with tangential poling is investigated for transformer application and an analytical solution is obtained.Numer- ical calculations of the output voltage,input admittance and the efficiency of the transformer are presented.The results indicate that the structure analyzed can be used as a piezoelectric transformer with a certain harmonic driving frequency and matching load impedance.     

斜波压缩实验数据的正向Lagrange处理方法研究

提出了一种联合使用Lagrange方法和转换函数方法来处理斜波压缩实验数据的新途径，和传统的数据处理方法相比，该方法更适合处理材料的复杂力学响应并具有较好的精度，同时该方法使用过程中对样品材料参数的初猜值精度要求更低。分析了转换函数方法的可靠性和健壮性，讨论了转换函数和Lagrange方法联合在斜波压缩强度实验数据处理中的应用，获得了可靠的结果。     

Synthesis of Janus Particle Arrays and Janus Films through an Interfacial Polymerization Method

Russian Journal of Physical Chemistry A - We report the fabrication of Janus particle arrays and Janus films through the combination of selfassembly of spheres on a water surface and interfacial...     

二阶Nuemann特征值问题的正解

利用锥上的不动点定理证明了二阶Nuemann特征值问题-u″＋Mu=λa（t）f（u（t））m0≤t≤1 u′（0）=u′（1）=0是的正解存在性结果．     

飞秒泵浦-探测质谱方法研究苯内转换动力学

以飞秒 40 0及 2 66nm激光脉冲结合泵浦 探测飞行时间质谱方法研究了苯S2 态内转换动力学 .40 0nm双光子过程将苯分子激发到S2 电子态 ,布居在S2 电子态的分子由于能级耦合无辐射弛豫到S1电子态 .通过测定C6 H6 +讯号强度随泵浦 探测延迟时间的改变 ,获得苯S2 及S1电子态的衰减寿命分别为 ( 48± 1)fs及 ( 6.5± 0 .2 )ps ,S2 态及S1电子态的消激发机理被认为是相应势能面间的锥形交叉引起的内转换     

HeH_2~＋体系的势能函数与动力学研究──（一）基态HeH_2~＋的分析势能函数

此文首次用ａｈｉｎｉｔｉｏＣＩＤ／６—３１Ｇ法计算了ＨｅＨ２＋（Ｘ２Σ＋）的平衡键长、离解能和谐性力常数。应用简化的多体项展式法，导出了ＨｅＨ２＋（Ｘ２Σ＋）的分析势能函数，考察了势能面的主要特征。     

飞秒泵浦-探测实验数据分析

陈述了几种获取飞秒泵浦 探测实验数据中的光解动力学信息的解析物理模型 .其中单分量和双分量模型用来解释母体分子的单通道和双通道解离过程 ,另一个单分量模型用来解释碎片分子的解离或去激发过程 .所有模型都结合泵浦 探测实验数据予以解释