春节晚会网上播

只要多一点交互及流式多媒体,中国人的Web,将自然呈现旺盛的生命力。 新兴的IT产业自入驻中国以来,虽以迅疾的速度成长,但所存在的单一性仍局限着互联网的发展。有关数据显示:美国的Internet用户已达3000～4000万;日本2000万,而拥有13亿人口的中国只有200万的Internet用户。综观大局,中国的Internet虽无可否认有所发展,但仍处于低靡状态。改变现状,已刻不容缓。1999年中央电视台春节联欢晚会的“网     

基于关联规则的财务信息管理系统

为了提高财务管理的工作效率及准确性,提出基于关联规则的财务管理系统。在JBPM (Java Business Process Management)工作流引擎构架基础上,利用关联规则挖掘信息特征,融合财务信息;将MVC(Model—View—Controller)分层设计思想应用于分层控制,对其数据加载和程序进行多种web数据格式的编译控制,并接入财务信息管理系统中,实现网络化管理。测试结果表明,系统工作效率和计算精准性均优于传统方法,且可有效降低企业财务成本支出。     

CHEMICAL SPECIES OF IRIDIUM AND OTHER TRACE ELEMENTS IN THE CRETACEOUS-TERTIARY BOUNDARY CLAYS AND ITS IMPLICATION

The geological samples: Cretaceous- Tertiary (K- T) boundary clays, meteorites, volcanic lava, and ultrabasic rock were separated into carbonate, metal, sulfide, oxide, silicate and acid- resistant residue by a selective chemical dissolution procedure developed in our laboratory. Some conclusions were drawn by analyzing the chemical speciation of anomalous iridium in the above samples and especially by studying the characteristics of mineral components in those residue phases. (1) It is impossible that the anomalous Ir was caused by geochemical enrichment; (2) The iridium enrichment in the K- T boundaries did not necessarily associate with kerogen; (3) The volcano activity has participated in the extinction event at the end of Cretaceous; (4) Extraterrestrial impact was the trigger of K- T event. Then, we proposed a mixed model by which the extant anomalous Ir in K- T boundary clays was interpreted as a combined effect of extraterrestrial impact, volcano eruption and post- depositional redistribution.