In this paper, a detailed computer-based numerical simulation centering on the export linewidth of diverse physical mechanisms of optic parametric oscillator by using a kind of new nonlinear optical crystal-CsLiB 6O 1...In this paper, a detailed computer-based numerical simulation centering on the export linewidth of diverse physical mechanisms of optic parametric oscillator by using a kind of new nonlinear optical crystal-CsLiB 6O 10(CLBO) pumped by 355?nm pulse laser is presented. The results point out that the linewidth is influenced by the divergence angle and off-axis of pumping larger than that other factors do.展开更多
Since the beginning of the new century, all trades in China have started to introduce e commerce, and many traditional enterprises have scrambled for this newly born business. It is important and urgent for China Post...Since the beginning of the new century, all trades in China have started to introduce e commerce, and many traditional enterprises have scrambled for this newly born business. It is important and urgent for China Post to introduce and develop e commerce. But what measures should we adopt to develop e commerce? This paper provides some practical and reasonable approaches and strategies to develop e commerce.展开更多
The feasibility of application of the Central Place Theory in the distribution of post offices in cities is analysed, the grade scale structure and space distribution structure Shijiazhauang of post offices in city ar...The feasibility of application of the Central Place Theory in the distribution of post offices in cities is analysed, the grade scale structure and space distribution structure Shijiazhauang of post offices in city are studied, the research results prove the actual value of the Central Place Theory, and the suggestion of adjustment in the space distribution Shijiazhuang of post offices in city is put forward.展开更多
文摘In this paper, a detailed computer-based numerical simulation centering on the export linewidth of diverse physical mechanisms of optic parametric oscillator by using a kind of new nonlinear optical crystal-CsLiB 6O 10(CLBO) pumped by 355?nm pulse laser is presented. The results point out that the linewidth is influenced by the divergence angle and off-axis of pumping larger than that other factors do.
文摘Since the beginning of the new century, all trades in China have started to introduce e commerce, and many traditional enterprises have scrambled for this newly born business. It is important and urgent for China Post to introduce and develop e commerce. But what measures should we adopt to develop e commerce? This paper provides some practical and reasonable approaches and strategies to develop e commerce.
文摘The feasibility of application of the Central Place Theory in the distribution of post offices in cities is analysed, the grade scale structure and space distribution structure Shijiazhauang of post offices in city are studied, the research results prove the actual value of the Central Place Theory, and the suggestion of adjustment in the space distribution Shijiazhuang of post offices in city is put forward.
