According to recent research advance of soybean transformation,three genetic transformation systems were established and optimized: cotyledon nodestransformation system refers to the method of Iowa University of USA, embryonic tiptransformation system refers to Liu's newest report;
According to OSI/RM layers,the recent research advance is summarized in network protocol engineering. Then fundamental methodologies for Petri net based protocol engineering in protocol specification,verification and analysis are given. At last,a data link layer protocol-Stop-and-Wait communication protocol is described and analyzed using colored Petri net.
按照OSI/RM模型的层次,论述了Petri网在网络协议工程中的研究进展情况,并从协议描述、协议验证与分析的角度给出了基于Petri网的协议工程的基本方法,最后用有色Petri网对数据链路层的Stop and Wait通信协议进行描述分析.
The proposition, discovery and physical and chemical properties of the new type superhard material-carbon rnitride (β-C3N4 ) are summarized. It's recent research advance. at home and abroad and future applications are reported.
This article reviews the recent research advance of pearls on the constituents, structure, physical and chemical property, safety, pharmacological action and application in the field of biomedicine etc.
The absence of specific cellular receptor(s) constitutes the barrier of HBV infection and replication in nonhuman hepatocytes. According to recent research advance in HBV receptors, transfected HepG2 and CHO cells by HBV binding protein cDNA acquired a remarkable virus binding capability .
The research field for image compression coding algorithms is summarized,several main image compression coding algorithms in common use are introduced. Meanwhile,the image compression coding algorithm based on wavelet transform--the recent research advance in image coding filed is put forward,and some new researches which are believed to be of great research value is proposed.
The proposition, discovery and physical and chemical properties of the new type superhard material-carbon rnitride (β-C3N4 ) are summarized. It's recent research advance. at home and abroad and future applications are reported.
This article reviews the recent research advance of pearls on the constituents, structure, physical and chemical property, safety, pharmacological action and application in the field of biomedicine etc.
Future computer network will become an integrated services network that will be able to provide various services to support a wide range of network applications. This integrated services network will be built by using many kinds of service performance assurance mechanisms upon a general packet switched network. Packet scheduling mechanism is one of the most important mechanism of such mechanisms, and the core problem of packet scheduling mechanism is its algorithm.This paper makes a survey of the resear...