吲哚衍生物的薄层色谱分离方法

N-烷基化取代吲哚是吲哚苯酞类压敏染料的重要中间体,通过非N-烷基化取代吲哚进行相转移催化合成。为了采用薄层色谱法跟踪相转移催化反应,必须寻找取代吲哚在N-烷基化前后两者薄层色谱分离的条件。文献较多地报道了吲哚母体及含羧基、羟基、氨基、氰基、酯基等极性吲哚衍生物在有关展开剂中的比移值R_f,而对极性相差很小的N-烷基化和非N-烷基化取代吲哚的分离条件,尚未见详细报道。     

超高效液相色谱-串联质谱法快速测定镇咳祛痰药中阿片类物质的含量

建立了镇咳祛痰药中吗啡、可待因、海洛因、蒂巴因、罂粟碱、那可汀6种阿片类物质含量的LC-MS/MS快速测定方法.药品经超声浸取,甲醇稀释过滤后经Waters C18柱分离,以乙腈和10 mmol/L乙酸铵(含0.1％甲酸)溶液进行梯度洗脱,采用电喷雾正离子化(ESI+)、多反应监测模式进行测定.6种阿片类物质在相应的线...     

The Crystal and Molecular Structure of a New Macrocyclic Ligand, (H_6BDBPH)Br_6·4H_2O

1　ＩＮＴＲＯＤＵＣＴＩＯＮＯｎｅｏｆｏｕｒｃｕｒｒｅｎｔｉｎｔｅｒｅｓｔｓｆｏｃｕｓｅｓｏｎｔｈｅｄｅｓｉｇｎａｎｄｓｙｎｔｈｅｓｅｓｏｆｐｏｌｙａｚａｍａｃｒｏｃｙｃｌｉｃｌｉｇａｎｄｓ,ａｎｄｔｈｅｓｔａｂｉｌｉｔｉｅｓｏｆｃｏｒｒｅｓｐｏｎｄｉｎｇｍｅｔａｌｃｏｍｐｌｅｘｅｓ.Ｔｗｏｐｏｌｙａｚａｄｉｐｈｅｎｏｌｍａｃｒｏｃｙｃｌｅｓ,Ｒ(ｂａｂｐ) 2 (ｄｆｃ) 2 ａｎｄＲ (ｂａｃ) 2 (ｄｆｐ) 2 ;[1 ]ｏｎｅｏｃｔａａｚａ ｍａｃｒｏｃｙｃｌｅ,ＢＰＢＤ ;[2 ,3]ａｎｄｓｅｖｅｒａｌｈｅｘａａｚａｍａ…     

非均匀系统中非自治孤子的色散和非线性管理

基于包含自发拉曼散射和外电光调制效应的非自治非线性薛定谔方程,采用简单的变换方法,解析研究了三种非均匀系统中非自治孤子的管理和传输。结果发现,在非均匀的非线性渐增或色散渐减光纤系统中都存在精确的啁啾非自治孤子解,都可以实现孤子的放大和压缩,但具有不同的速度、频移和啁啾特性;而在非均匀的色散和非线性均渐减光纤系统中,可以支持无啁啾的非自治孤子,该孤子具有不变的脉宽和振幅以及振荡衰减的速度,孤子的频移仅由自发拉曼散射决定。同时,数值模拟结果进一步证实在三种非均匀管理系统中都可支持非自治孤子的传输。该研究结果为实际非均匀孤子管理系统中实现孤子的压缩和传输提供了理论依据。     

Polarization enhancement and suppression of four-wave mixing in multi-Zeeman levels

Polarization dependence of the enhancement and suppression of four-wave mixing (FWM) in a multi-Zeeman level atomic system is investigated both theoretically and experimentally. A dressing field applied to the adjacent transition can cause energy level splitting. Therefore, it can control the enhancement and suppression of the FWM processes in the system due to the effect of electromagnetically induced transparency. The results show that the pumping beams with different polarizations select the transitions between different Zeeman levels that, in turn, affect the enhancement and suppression efficiencies of FWM.     

基于三维卷积神经网络与超像素分割的高光谱分类

高光谱遥感数据具有详细的地物光谱与空间信息.针对高光谱数据空间信息在以往分类方法中未得到充分利用而导致鲁棒性与分类精度较低的问题,提出了一种改进的超像素分割与三维卷积神经网络分类方法.该方法首先通过超像素分割与模糊聚类对高光谱遥感数据进行区域分割,再使用三维卷积神经网络对得到的区域分割结果与高光谱数据形成的空-谱联合数据进行训练与分类.通过对空间区域进行划分融合,所提方法提升空间信息在分类中的作用,减小"同物异谱"现象对分类的影响,同时引入三维卷积神经网络对空-谱联合数据进行训练与分类,提升了高光谱分类精度.所提方法在Pavia University和Salinas数据集的总体准确率为97.53％和98.48％,与各对照实验相比,具有更为良好的分类效果,验证了所提方法的有效性.     

逆H矩阵的新性质

本文在文[4]给出的逆H矩阵定义的基础上，给出了逆H矩阵的新性质．     

A Convenient and Efficient Route to 1,4-Bis（heteroaryl）-buta-1,3-diene and 4-Heteroarylbut-1-en-3-yne from 1,4-Dichlorobut-2-yne

A convenient and practical route to functionalized conjugated 1,3-enynes and 1,3-dienes is described. 1,4-Bis（heteroaryl）- 1,3-diene and 1-heteroarylbut- 1-en-3-yne derivatives were prepared from 1,4-dichloro-2-butyne and corresponding N-heteroarenes such as imidazole, pyrrole, pyrazole and indole derivatives in the presence of bases in good to high yields.     

Propagations of Fresnel diffraction accelerating beam in Schrödinger equation with nonlocal nonlinearity

Accelerating beams have been the subject of extensive research in the last few decades because of their self-acceleration and diffraction-free propagation over several Rayleigh lengths. Here, we investigate the propagation dynamics of a Fresnel diffraction beam using the nonlocal nonlinear Schrödinger equation (NNLSE). When a nonlocal nonlinearity is introduced into the linear Schrödinger equation without invoking an external potential, the evolution behaviors of incident Fresnel diffraction beams are modulated regularly, and certain novel phenomena are observed. We show through numerical calculations, under varying degrees of nonlocality, that nonlocality significantly affects the evolution of Fresnel diffraction beams. Further, we briefly discuss the two-dimensional case as the equivalent of the product of two one-dimensional cases. At a critical point, the Airy-like intensity profile oscillates between the first and third quadrants, and the process repeats during propagation to yield an unusual oscillation. Our results are expected to contribute to the understanding of NNLSE and nonlinear optics.     

ICP-AES测定二氯化钯中的杂质元素

PdCl2试样用氨水溶解,加Y作载体共沉淀分离富集杂质元素,富集物转化成盐酸溶液,ICP-AES测定Pb、Sb、Bi、As、Sn、Fe、Zr、Cr、Be、Ti等杂质元素。测定范围为0.0002%-0.01%,加标回收率为84%-114%。相对标准偏差为2.2%-7.4%。方法准确、简便。