海洋多氯二酮哌嗪的分子结构研究

从中国南海采集的倔海绵(Dysideafragilis) 中分离得一种新的不饱和多氯二酮哌嗪-倔酰胺E(dysamide E).通过波谱分析及与倔酰胺C(dysamide C)进行比较而确定其化学结构,通过X射线单晶衍射分析了含两个双键的多氯二酮哌嗪衍生物的构蠤34Previously, 5 polychlorinated diketopiperazines were isolated from the marine sponge Dysidea fragilis. This paper reports another diunsatd. polychlorinated diketopiperazine, dysamide E (I) isolated from the same marine sponge. Compound I, C14H16Cl6N2O2, is colorless needles. The structure of I was deduced by spectroscopic method. The boat conformation of its geometric isomer, dysamide C, studied by x-ray diffraction anal. is described.     

拓扑指数法研究稀土显色剂结构与钇显色反应灵敏度的关系

本文计算了二十种不对称色酸双偶氮膦酸型显色剂的Am指数, 并将其与钇进行显色反应的灵敏度进行相关性研究, 讨论了显色剂结构对显色反应灵敏度的影响,预报了几种显色剂与钇显色反应的灵敏度, 取得较为满意的结果。     

EHMO Studies of Chemisorbed Dioxygen Species on Na＿2O and K＿2O and of Their Interaction with CH＿4 and CH＿3－Radical

ＥＨＭＯＳｔｕｄｉｅｓｏｆＣｈｅｍｉｓｏｒｂｅｄＤｉｏｘｙｇｅｎＳｐｅｃｉｅｓｏｎＮａ＿２ＯａｎｄＫ＿２ＯａｎｄｏｆＴｈｅｉｒＩｎｔｅｒａｃｔｉｏｎｗｉｔｈＣＨ＿４ａｎｄＣＨ＿３－ＲａｄｉｃａｌＳＵＱｉａｏ－Ｊｕａｎ,ＺＨＡＮＧＨｏｎｇ－ｂｉｎ,ＺＨ...     

Studies on the Steroids of Marine Sponge(Ⅳ)──Steroids from the Marine Sponge Biemna Sp.

Reported here is identification of a 7-en-sterol and a 5-en-sterol which containsa cyclopropane ring in its side chain and is separated from the South China Seasponge Biemna sp..This leads to the isolation and identification of twelve sterols inthis marine sponge by using gas chromatography-mass spectrometry (GC-MS)analysis.The occurrence of 7-en-sterol and 5-en-sterol with a cyclopropane ring inits side chain from the south China Sea sponge was first reported here.     

QUARK-ANTIQUARK ONE GLUON EXCHANGE POTENTIAL AND EFFECTIVE NUCLEON-ANTINUCLEON POTENTIAL

In this paper, the quark-antiquark one gluon exchange potential corresponding to the annihilation channels is calculated to the order of p²/m² by means of Fierz reordering transformation. The nucleon-antinucleon effective potential obtained from one gluon exchange potential has a strong attraction at a short distance as expected in the meson-exchange theory.     

光纤水听器解调技术研究进展

光纤水听器是水声研究领域的关键技术,在实际应用中具有显著优势,广泛应用于AUV导航定位、资源勘探、海水警戒等场景.光纤水听器将声信号转化为光信号传播,在接收信号时就需要对光信号进行解调提取出声压信号.总结了几种常用的信号解调算法及关键技术,包括PGC解调法、3×3耦合器解调法和外差解调法;介绍了各种解调算法的基本原理和...     

图像序列运动检测算法的研究及其应用

探讨了监控图像序列中进行运动检测的若干基本算法 ,结合统计方法和边缘检测筛选出运动边缘点 ,对运动边缘点逐个进行了块匹配最优搜索 ,估算出其运动矢量 .此方法在数字视频监控系统中用于运动物体检测和报警 ,不但提供了智能型监控 ,而且也有效的压缩了存储数据 ,改善了系统性能 ,有较好的实用价值 .     

一种多重图像融合系统的电配准技术

在多光谱实时图像融合实验系统的基础上,提出一种实现图像融合系统中非共轴光学系统微小量配准的电子学方法,讨论了配准原理、所采用的技术方案及系统实现的技术途径。在机械粗配准之后,系统可快速实现系统微小量的配准功能     

光度法测定松脂中的铝

研究了用铝试剂,乙酸－乙酸铵缓冲溶液组织的体系以及光度法测定松脂微量铝的条件,提出了一种灵敏度、选择性与稳定性较好的测定松脂中铝的方法,在０－５０μｇ／５０ｍＬ范围内服从比耳定律。     

1H-NMR测定手性化合物的对映体过量

概述了研究手性化合物的核磁共振方法,对＾Ｈ－ＮＭＲ测定手性化合物的对映体过量进行了综述。并将上民施光度测定法和色谱法进行了比较。