Search engine is an effective approach to promote the service quality of the World Wide Web. On terms of the analysis of search engines at home and abroad, the developing principle of search engines is given according to the requirement of Web information for chemical fiber engineering. The implementation method for the communication and dynamic refreshment of information on home page of the search engines are elaborated by using programming technology of Active Server Page 3.0 (ASP3.0). The query of chemical fiber information and automatic linking of chemical fiber Web sites can be easily realized by the developed search engine under Internet environment according to users' requirement.
Wireless technology is a new emerging delivery networks and development scheme of wireless internet is given widely attention currently. In order to make international visitors to surge education website at any time, anywhere by mobile handsets. The communication method of web database, such as CGI, ISAPI, JDBC and so on have been aralyzed and a new Active Server Page &Wireless Makeup Language (ASP-WML) based approach is presented. The dynamical refreshment of the homepage of wireless website and the automatic query of main information have been realized. At last, the wireless website of Dong Hua University is taken as an example to testify the possibility of wireless website design which is mentioned above.
According to the structure character of the passive sub-chain of the 3TPS-TP parallel mechanism, the kinematic constraint equations of the movable platform are established, based on which the closed-form inverse kinematics formula of the parallel mechanism are presented. Through parting the spherical joints of the active sub-chains and using the force and moment equilibrium of both the active sub-chains and passive sub-chain, the constraint forces acting on the parted joints are determined. Subsequently, the analytic expressions of the actuator driving forces are derived by means of the force equilibrium of the upper links of active sub-chains.
