根据三轴光纤陀螺的高精度需求,采用大功率高稳定性的高精度双程后向方案掺铒光纤光源。通过对ASE光源的理论分析建立数学模型,并根据所用掺铒光纤及泵浦光源的参数对光源进行谱型分析,确定光路方案。再以掺铒光纤和泵浦激光器的温度特...根据三轴光纤陀螺的高精度需求,采用大功率高稳定性的高精度双程后向方案掺铒光纤光源。通过对ASE光源的理论分析建立数学模型,并根据所用掺铒光纤及泵浦光源的参数对光源进行谱型分析,确定光路方案。再以掺铒光纤和泵浦激光器的温度特性和补偿为研究重点,对掺铒光纤的长度和掺杂浓度以及泵浦功率和铒纤的匹配性进行试验,最终采用铒纤长度19 m,泵浦波长974.6 nm,泵浦功率140 m A,得到光源光功率为20 m W,平均波长变化量小于0.5′10^(-6)/℃,满足光纤陀螺对ASE光源的要求。展开更多
Children's skills of social interaction is a significant index of their following psychological development. Prosocial behaviors which influenced by many factors are fundamental representatives of social interacti...Children's skills of social interaction is a significant index of their following psychological development. Prosocial behaviors which influenced by many factors are fundamental representatives of social interaction. Present essay illustrates an indepth review of literature concerning the impacts of family,peers, school and media in Children's prosocial behaviors and also indicates the limitations of each research.展开更多
In recent years,Globalization enhances the development of education and corporation between higher education organizations.Being part of international organization involved in education policy-making,UNESCO has play a...In recent years,Globalization enhances the development of education and corporation between higher education organizations.Being part of international organization involved in education policy-making,UNESCO has play an indispensable role in the enhancement of higher education.Present essay introduces the structures and working patterns of UNESCO and its role in accelerating the formulation of higher education policy.Meanwhile,limitations and challenged UNESCO confronted are also provided to give a detailed analysis of the role UNESCO plays in higher education.展开更多
文摘根据三轴光纤陀螺的高精度需求,采用大功率高稳定性的高精度双程后向方案掺铒光纤光源。通过对ASE光源的理论分析建立数学模型,并根据所用掺铒光纤及泵浦光源的参数对光源进行谱型分析,确定光路方案。再以掺铒光纤和泵浦激光器的温度特性和补偿为研究重点,对掺铒光纤的长度和掺杂浓度以及泵浦功率和铒纤的匹配性进行试验,最终采用铒纤长度19 m,泵浦波长974.6 nm,泵浦功率140 m A,得到光源光功率为20 m W,平均波长变化量小于0.5′10^(-6)/℃,满足光纤陀螺对ASE光源的要求。
文摘Children's skills of social interaction is a significant index of their following psychological development. Prosocial behaviors which influenced by many factors are fundamental representatives of social interaction. Present essay illustrates an indepth review of literature concerning the impacts of family,peers, school and media in Children's prosocial behaviors and also indicates the limitations of each research.
文摘In recent years,Globalization enhances the development of education and corporation between higher education organizations.Being part of international organization involved in education policy-making,UNESCO has play an indispensable role in the enhancement of higher education.Present essay introduces the structures and working patterns of UNESCO and its role in accelerating the formulation of higher education policy.Meanwhile,limitations and challenged UNESCO confronted are also provided to give a detailed analysis of the role UNESCO plays in higher education.