the application and development of on-site sound amplifying technology for large scale performance were introduced from the two aspects of on the spot performing and TV video shows.

The theories result and comprehensive technique measure is introduced to improve side entry well cementing quantity,annular clearance of slim hole and casing,micro-step hole enlargement technology,slim hole cementing technology and complement are dissertated concretely.

Aiming at the difficulties of mine communication,a scheme of mine through-the-earth(communication) system using spread-spectrum technology was proposed,which can be realized digitally.

The Application of Spread Spectrum Technique Communication in Radio Frequency Identi-fication System;

After presenting an introduction of digital watermark,this article put s emphasis on analysing exploiting techniques and virtues of spread spectrum technique in digital watermark.

The advantage, method and current state of using spread spectrum technique in power line communication are discussed.

Academic Relation between Technology Diffusion and Enterprise Organizational Structure Spatial Corrving and Distribution Again;

Analysis for agricultural technology diffusion——Case study of agricultural demonstration areas in Yangling;

A Digital Image Watermark Algorithm Taking Use of the Orthogonal Code Spread Spectrum Technology;

Owning to a series of unique advantages,spread spectrum technology has been applied to many corresponding domains.

In order to solve the low transmission rate problem of DSSS, the multiple sequence spread spectrum technology is introduced, including a discussion on its transmission, receiving and characteristics.