onon crystal". The researchers of the project have successfully produced high-quality big crystal, such as YCOB, Nd:YCOB, and GCOB, and have found out experimentally that the most effective power output direction is not on the main plane, which was recognized in the would. The YCOB direct double frequency has been obtained and the acquired output efficiency of the green light is 15% higher than the best result abroad. The Nd:YCOB crystal has been used to obtain the self double frequency green light output in the most effective power output direction. Through the super-lattice micro-structural design, the laser direct triple frequency theory and methods have been developed, and the big-sized triple frequency optical supper-lattices with different structure sequences have been produced. For the first time, the small and completely solid optical maser with two wavelengths of UV-green and red-blue has been produced. This achievement is the first experimental result with application value, regarding the quasi-crystal and quasi-period material in the field of non-linear optics since the quasi-crystal was found.

The project of "digital mechanization and automatic reasoning platform" puts forward three methods of automatic geometric construction: overall continuation, symbol computation and data value optimizing, which have been utilized resole the p3p space localization issue, the restriction conflict between Kempe connecting rod design and smart CAD, as well as divider and ruler construction issue. On this basis, the concept of "engineering geometry" has been brought forward. The project also saw certain breakthrough in the research on the application targets, and gave the mechanical method of the conformation and selection of small waves as well as its application in the dynamic image data compression, particularly the dynamic image data compression on the targeted areas. This technology has broad application prospects in confidential telecommunication, video telephone, remote sensing, tele-healthcare. And the proposal about "multi-elemental transformation" technology has been adopted by the JPEC 2000 image compression international standards and written into the related chapters of the second part of the final draft.

The "Forecast research on the evolution of China's future living environment and North China's aridity trend" develops the integrated model of regional environment system for the quantitative forecast of the aridity trend. The model has excellent capability of simulating the climate characteristics of North China's arid and semi-arid regions, and plays a leading role in the international plan composed of ten regional models for Asian area. The project puts forward the forecast of the aridity trend of North China in the coming 10-15 years. (1) As a result of the long-term evolvement of the natural environment, Northwest China will keep its aridity, and the weak fluctuation of the precipitation can't change the arid situation. (2) The North China and the west of Northeast China, where aridity has been fiercest in recent years under the actions of natural fluctuation, global warming and the human impacts, will continue to see accelerated aridity in the forthcoming 10-15 years. In the next 30 years, the natural fluctuation will make the areas enter the relatively wet period. Provided that regional eco-environmental damages are controlled after the global warming trend is offset by the natural fluctuation, the aridity velocity may be reduced and the drought may be eased.

It can be estimated that, with the continuous development of the 973 Program, these on-going research projects will play an incredibly promotional role in China's economic construction, social advance and scientific and technological development.

Vision about the 973 Program during the Tenth Five-Year Plan period

During the Tenth Five-Year Plan period, the 973 Program, in line with the overall arrangement stipulated in the Tenth Five-Year Plan for scientific and Technological Development of China, will be oriented to meet the national important demands, and address the important scientific and technological issues concerning social advance and national economy, and to prioritize the improvement of China's original innovation capability. The 973 Program will follow the development concept of "stability, consolidation and perfecting", give prominence to key projects, enhance integration, and continue to plan a strategic development of national key basic research. Through the in-depth implementation of the 973 Program, we should be further upgrade the scientific and technological level, particularly the overall level of basic research, so as to make due contributions to the grand objectives of making China a scientific and technological power by mid-21st century.

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