In this paper,the writer analyses the influences from base station cross-boundary coverage to mobile telecommunications network,do research on how to analyze and evaluate base station cross-boundary coverage by a variety of tools,and put forward the ways to control base station cross-boundary coverage.

Methodological study of the heavy-cover areain 1:250000 regional geological survey;

Method of using regional geochemical data in geological mapping in shallow overburden areas;

Relation between the chemical compositions of residual soils and bedrocks in shallow overburden areas and its significance-a case study of the northern Da Hinggan Mountains;

The ground gamma spectrometry as an auxiliary means for geological mapping in areas with shallow overburden areas is a new trial.

Prospects of applications of multi-target geochemical survey data in covered areas-Example from relevant results of ecological geochemical survey of land in Jiangsu,China;

The thinking, method and channel of remoto geological research in the covered areawere discussed in the paper.

This work in Xi\'an is earlier than in western,and a represent of loss covered area.

Optimization of regional coverage satellite constellations based on ant colony algorithm;

Design of regional coverage satellite system with common-track constellation;

Evolutionary algorithm for simultaneously optimization of regional coverage satellite constellation structure and parameters;