The canonical form for complcx semidefinite positive matrix under complex congruence is established, therefore two important inequalities of the norm of determinant are obtaincd.

Research on AB_5 type hydrogen storage alloys is reviewed with an emphasis on element substitu- tion,surface treatment and multi-phase composite,which are also helpful for the high rate discharge property of AB_5 type hydrogen storage alloys.

Based on the multiphase composite ceramic tool material Al 2O 3 reinforced by SiC and (W,Ti)C particles, the magnitude and the distribution of the residual thermal stress are analyzed in detail with the finite element modeling method.

The multiphase composite and the computer aided design of the ceramics are two significant trends in the development of the advanced ceramic materials in the 21st century.

A theoretical model was built for the determination of the critical volume content of reinforcement phases in multiphase composite ceramic materials.

When antifreezing agent is added into composite fuel oil, the freezing point of composite fuel oil can be reduced.

In this paper,components of composite fuel oil against agglomeration and production technique and its main factors of a big bundle of AN TNT are discussed with details.

Composite fuel oil of different formula how to affect the performance of Modified ANFO(1) Adding different content of mineral wax and rosin to the composite wax and paraffin,and to study mineral wax and rosin how to affect the performance of Modified ANFO.