The thought of agricultural science summized by Confucianists prior to the Qin dynasty which mainly contained:"plant crops according to soil","act on the laws of nature","harness soil in order to bumper harvest","apply fertilizer properly"etc,is valuable for us to cherish.

On the Underlying Reasons for Stopping Publication of Shuntian Times;

Japanese Journalists in China and Sino-Japanese Ties in the First Half of 20th Century ——To center around Shuntian Times;

On the Risc of Shun Tian Times;

With the analysis of ADEV and HDEV for NTSC s more than 20 atomic clocks as well as the BIPM publications of rate and weight,the usability of a clock in high precision time keeping is discussed.

The combination of frequency standards of NTSC s time keeping system,the generation and maintenance of UTC(NTSC),and the development of the TA(NTSC) algorithm are presented briefly.

Time keeping and dissemination are two main parts in standard time service field.

The performance of timekeeping system is one of the main factors which affects stability of the UTC(K).

In the design, FPGA is used to process timing signal, realizing such requirements as the identification of combat system on multi-channel time service signals, timekeeping and time precision,and meeting the demands of different systems on unify-time function.