植物分类学是区分植物种类,探索植物间亲缘关系、阐明植物界自然系统的科学。阐述了植物的命名方法、桑树在植物分类学上的位置、桑属植物分类研究简史,自从1753年瑞典的博物学家林奈(Carl von Linne)将桑属分为5个种类以来,对桑树分类...植物分类学是区分植物种类,探索植物间亲缘关系、阐明植物界自然系统的科学。阐述了植物的命名方法、桑树在植物分类学上的位置、桑属植物分类研究简史,自从1753年瑞典的博物学家林奈(Carl von Linne)将桑属分为5个种类以来,对桑树分类有重要贡献的有意大利的毛利奇(G.Moretti)、法国的施林奇(N.C.Seringe)、法国的布油劳(E.D.Bureau)、德国的舒奈德(C.K.Schnecder)、日本的小泉源一(Koidzuml)等人,详细介绍了他们对桑属分类的概况以及中国桑属分类的近况。展开更多
A safe and reliable application system frame based on Internet and Intranet for Stock Supervision and Administration Council of China is built up. An all sided, multi tier and multi technical security method has be...A safe and reliable application system frame based on Internet and Intranet for Stock Supervision and Administration Council of China is built up. An all sided, multi tier and multi technical security method has been adopted, which includes identity recognition, data encryption, digital signature, Domino and WWW servers, access control list, directory service, certificate authorization server, IC card and so on. The recognition system based on CA server is a high efficient, convenient and reliable system. The encryption technology and security method are proved to be reliable. The recognition system is of high security and is worthy of being popularized in some places where some special security requirements need meeting. Multi tier technology can improve the security of database. Double keys method is a useful data encryption method.展开更多
文摘植物分类学是区分植物种类,探索植物间亲缘关系、阐明植物界自然系统的科学。阐述了植物的命名方法、桑树在植物分类学上的位置、桑属植物分类研究简史,自从1753年瑞典的博物学家林奈(Carl von Linne)将桑属分为5个种类以来,对桑树分类有重要贡献的有意大利的毛利奇(G.Moretti)、法国的施林奇(N.C.Seringe)、法国的布油劳(E.D.Bureau)、德国的舒奈德(C.K.Schnecder)、日本的小泉源一(Koidzuml)等人,详细介绍了他们对桑属分类的概况以及中国桑属分类的近况。
文摘A safe and reliable application system frame based on Internet and Intranet for Stock Supervision and Administration Council of China is built up. An all sided, multi tier and multi technical security method has been adopted, which includes identity recognition, data encryption, digital signature, Domino and WWW servers, access control list, directory service, certificate authorization server, IC card and so on. The recognition system based on CA server is a high efficient, convenient and reliable system. The encryption technology and security method are proved to be reliable. The recognition system is of high security and is worthy of being popularized in some places where some special security requirements need meeting. Multi tier technology can improve the security of database. Double keys method is a useful data encryption method.
