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The sleeve-bolt connection and the groove-plate connection are two major forms of bamboo’s joints under tension and compression load, and the strength of these two connections is normally governed by the brittle failure mode of shearing-split. A new configuration of sleeve-cement bamboo joint is designed. Comparative loading tests were carried out to study the static tensile and compressive performances of the bamboo joints. It is found that the joint with sleeve-cement connection behaves more ductile under tension and possesses higher strength under compression than those with the sleeve-bolt and groove-plate connections. The sleeve-cement connection ensures effective transition of the axial load in the bamboo joint, and there are more to be optimized in its design.

The paper studied the security measures of contactless IC card system. Derivation cryptographic algorithms were used in the embedded IC card system to generate multi-application cipher key, providing an effective solution for the applications with high security requirements.

The principles and methods of chaos generation are researched using piecewise linear circuit theory. The chaos generation circuit based on integrated operational amplifiers is designed to realize chaos. Simulation results of the circuit are got using Multisim software. It indicates that using this method, the relationships and laws between chaos and various circuit element parameters can be better found out.