The effect of pressure on the decomposition of compounds FexN at room temperature has been investigated X-ray diffraction analysis shows that high pressure prompts nitrigen atoms preciptating from the lattice of FexN compounds, causing phase decomposition and forming parent phase and α-Fe.

Secondary liquid separation and solidification of Cu-Co alloys under deep supercooling;

The liquid separation behaviors of 10%～30% Co Cu alloys were investigated by means of melt glass deep supercooling technology.

The liquid phase separation of Cu-Cr alloys under rapid solidification;

A limited rapid solidification technology was used to study the liquid phase separation in CuCr or CuCrZr alloy.

When the cooling rate is <103K/s,the solidification process of CuCr25 alloys belongs to a general solidification process;if the cooling rate is >104K/s,it belongs to the liquid phase separation process.

By polyphase decomposition,the channel frequency response sequence is divided into several subsequences,and phase ambiguities of each subcarrier can be resolved by exhaustive searching only(L+1) elements in one subsequence,wher.

This paper introduces the application of matched filter (MF) in acquisition of direct sequence spread spectrum communication systems, investigates practical implementation forms of MF and presents a new form based on polyphase decomposition.

In this paper, according to the principle of digital correlators and by the ultilization of polyphase decomposition, a plan of implementation which combines both methods is presented for digital correlators.