国外核潜艇事故中的潜艇大气控制问题

本文分析国外核潜艇事故与潜艇大气控制的关系,以及应从中吸取的经验教训。     

爱民固边的战略思维论要

爱民固边战略是＂十一五＂时期公安边防部队在建设社会主义和谐社会中的一项重大战略部署。＂十二五＂时期,形势任务更加严峻,必须进一步找准爱民固边是促进边境经济社会发展的新型人民战争的战略定位,完善以战略目的、战略原则、战略力量、战略措施为主要内容的战略架构体系,有效探索＂爱民—固边—发展—固边—利民＂的战略路线图,突出＂维稳主导、服务民生、强基固本、多元联动＂等战略重点,坚持＂并轨发展、标本兼治、无缝对接＂基本战略路径,使爱民固边战略更加系统化、规范化,纵深推进,打造公安边防特有品牌,不断产生更大的政治社会价值。     

Impact of atmospheric turbulence on coherent beam combining for laser weapon systems

The performance of a laser weapon system based on coherent beam combining (CBC) depends on its propagation properties in the atmosphere. In this study, an analytical model based on partial coherent beam combining (PCBC) for assumed coherence coefficients between beams in a CBC lattice was developed. The Kolmogorov model of atmospheric turbulence and the Hufnagel-Valley model of Cn2 dependence on atmospheric parameters were implemented. Novel simplified metrics were proposed to assess the CBC performance. Several beam profiles (super-Gaussian, truncated Gaussian, etc.) and ge-ometries were analyzed in terms of maximal intensity in the far field. An approximate formula for PCBC efficiency dependent on the Fried radius was proposed. The results of CBC modeling were compared to those of the Gaussian beam propagation model in a turbulent atmosphere. The dependence of CBC performance on the Cn2 parameter, range, and elevation angle was analyzed. It could be concluded that the application of CBC for medium and long range propagation is impractical without an effective adaptive optics system.