六元gcd封闭集上Smith矩阵的整除性

我们给出了关于六元gcd封闭集S的充分必要条件,使得在整数矩阵环M_6(Z)中,定义在S上的e次幂GCD矩阵(S~e)整除e次幂LCM矩阵[S~e].这部分解决了Hong在2002年提出的一个公开问题.     

劣质烟煤和无烟煤燃烧生成飞灰的电镜研究

一、前言 粉煤燃烧是一个非常复杂的物理化学过程。当煤粉被喷入锅炉炉膛后,受到火焰的辐射加热和回流烟气的对流加热,温度急剧上升,加热速率非常快,可达10~5K/秒。在一个极短的时间内,在煤粉粒子与周围介质之间及粒子内部进行着一系列的热质交换和化学反应:煤粒析出挥发份;挥发份与周围氧化介质发生气相反应;其反应产物与剩余焦碳     

陨石矿物中微包裹体及陨石微结构的研究

本文利用电子显微镜对不同的陨石样品进行观察研究,发现了陨石中有小于1微米的原生及次生微包裹体;在吉林、东台、溧水的陨石及熔壳中,观察到多种不同成因的微结构类型,反映出陨石在形成至陨落过程中经历了凝聚、熔融、旋转、冷凝及星体间撞击等作用。为了探讨陨石陨落时的溶融特征及温度,对陨石样品加温后,在电子显微镜下观察,结果表明,不同温度下的陨石样品具明显不同的熔融结构,吉林陨石在900-1050℃产生熔融。     

陨石微结构研究

本文利用扫描电子显微镜对吉林、西乌旗、渑池球粒陨石基质、球粒、单矿物及熔壳微结构进行研究,发现了不同类型原生及次生微结构,据此可以区分陨石原生及次生的特点。它们反映了陨石形成过程中经历凝聚、熔融、热变质、重熔、溶蚀、断裂等作用。陨石单矿物中微结构与基质及球粒中相似。     

STUDY ON THE MICROTEXTURES OF METEORITES

The microtextures of matrix, chondrule, single mineral and fused crust in Jilin, Xi Ujimqin Banner and Mianchi chendrites have been studied with SEM (Scanning Electron Microscope). Different kinds of primary and secondary microtextures have been found, so as to distinguish primary and secondary features of meteorites. They reflect that the meteorites underwent many processes during their formations, i.e. condensation, melting, thermal metamorphism, remelting, dissolution, fracture and so on. The microtextures iu single mineral of meteorites are similar to those in matrix and chondrule. According to the chondritic and melting primary microtextures of meteorites, the chondrules of multi-origin are grouped into original chondrules and remelting secondary chondrules. The secondary microtexture of meteoritic dissolution bleb results from that the meteorites are subjected to thermal metamorphism as a result of intergranular stean and solution acting on the meteorites. The different microtextures produced in f