室温熔盐二(三氟甲基磺酸酰)亚胺锂-尿素体系的分子动力学模拟

应用分子动力学模拟了25 ℃和50 ℃时新型室温熔盐二(三氟甲基磺酸酰)亚胺锂[LiN(SO2CF3)2, LiTFSI]与尿素(摩尔比为1:3.6)体系的结构与动力学性质. 在两个温度下体系的微观结构基本相同, Li+的配位数约为5, 且都是与溶剂和阴离子中的氧原子发生配位. 对TFSI-的研究表明, 每个TFSI-只提供四个氧中的一个与Li+配位; 而且在Li+的配位层中, TFSI-具有顺、反和gauche 等不同的构象, 并且不同构象出现的几率会随着温度的改变而改变.     

A New Triterpenoid Saponin and a New Glycoside from Epigynum aurilum

A new triterpenoid saponin with novel sugar moiety (1), a new trisaccharide derivative (2), as well as a known monosaccharide derivative (3), were isolated from the dried stem of Epigyhum aurilum. The structures of compounds 1 and 2 were determined by MS and NMR spectram analyses.     

Sesquiterpene Lactone Glycosides from Carpesium macrocephalum

Two new sesquiterpene lactone glycosides were isolated from the seeds of Carpesium meacrocephalum. Their structures were elucidated as 2α-O-β-D-glucopyranosy-5α,11αH-eudesma-4(15)-en-12,8β-olide and 2α-O-β-D-glucopyranosy-5αH-eudesma-4(15),11(13)-dien-12,8β-olide by spectral methods (HRMS,1D and 2D NMR).     

Two New C—21 Steroidal Glycosides from Cynanchum aurichulatum

Two new C-21 steroidal glycosides, cynanauriculoside I and cynanauriculoside Ⅱ, were isolated from the roots of Cynanchum aurichulatum. Their structures were established using spectroscopic methods including one and two-dimensional NMR.     

螺环五配位磷化物合成新方法

螺环五配位磷化物合成方法虽有不少报道,但有的路线较长;有的原料不易得到;有的条件苛刻且收率不高.本文提供一种新的简便合成路线,即在二甲二硫或二乙二硫存在下,含磷五元或六元环亚磷(膦)酸酯与含有两个活泼氢的双官能团化合物反应,一步制得相应的螺环五配位磷化物.反应式如下:     

Syntheses, Structures and Coordination Behavior of Central Hydroxyl Group Containing Polydentate Ligands

Proteins containing dinuclear Cu (II), Zn (II) centers play paramount roles in biology1. As mimetic of metal-dependent esterase, dinuclear Cu (II) and Zn (II) complexes have received a great deal of attentions2~6. They are of interest in the field of biomimetic chemistry to provide an improved understanding of the function of the biological sites and as potential catalysts for substrate oxidations. Schiff base type polydentate ligands which contain centeral hydroxyl group have been wid…     

Two New Xanthone Glycosides from Polygala tenuifolia

Two new xanthone glycosides,polygalaxanthone IV and V were isolated from the roots of Polygala tenuifolia Willd. Their structures were established as 6-O-[α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl]-1-hydroxy-3,7-dimethoxyxanthone(polygalaxanthone IV), and 6-O-[α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl]-1,3-dihydroxyl-7-methoxyxanthone (polyga-laxanthone V),respectively, on the basis of chemical and spectral evidence.     

Monoterpene Glycosides from the Roots of Paeonia lactiflora

The roots of Paeonia lactiflora Pall. is one of the most important traditional Chinese medicines, which has been used for the treatment of dizziness, spasm, menstrual disorder, spontaneous and night sweating, and as a general analgesic1. Chemical constitu…     

基于RAP全掺量下再生温拌沥青混合料路用性能研究

为实现资源的循环利用,降低高温作用对沥青的二次老化,引入N24型再生剂、A型合成蜡类温拌剂对RAP全掺量下再生温拌AC-16C沥青混合料展开研究.通过RAP原材料试验,确定RAP的矿料级配及油石比.在再生剂、温拌剂及再生温拌沥青等原材料研究的基础上制备再生温拌沥青,评价不同再生剂掺量下再生温拌沥青性能的改善情况,同时确定再生剂掺量为4%、温拌剂掺量为3%时沥青混合料的施工温度.通过对再生温拌沥青混合料开展高温抗车辙、抗水损害及低温抗开裂等试验,评价再生剂掺量对再生温拌沥青混合料路用性能的影响.结果表明,RAP中的粗集料发生了细化,但整体矿料级配与原矿料目标级配相当,无需对RAP进行级配调整;再生剂掺量为4%时,再生沥青性可能恢复到原道路石油沥青水平;3%温拌剂的掺入,沥青混合料拌和及压实成型温度分别降低30、40℃;再生剂掺量为4%时,再生温拌沥青混合料整体路用性能最优.     

一种基于PVDAC描述子的RGB-D三维点云配准方法

利用RGB-D数据进行三维点云配准时容易陷入局部最优.针对这个难题,提出了一种基于多维特征的PVDAC描述子实现三维点云配准的方法.该方法首先通过ORB特征检测算法提取二维数据的关键点,并计算关键点在2D下的灰度特征,然后构建关键点在3D下的局部像素值距离、点云法线角度以及曲率特征,接着将2D特征和3D特征联合生成全新的PVDAC像素描述子,并利用PVDAC像素描述子描述关键点实现三维点云的粗配准,最后基于ICP算法完成三维点云的精细化配准.实验表明,本文算法在大场景点云配准时总体均方误差约为0.05 m2,在小场景单物体点云配准时达到了0.000 2 m2的较小误差,实现了三维点云的精确配准.