全部文献期刊会议图书|学者科研项目
中外文文献  中文文献  外文文献
作者:... Zhang Xiao-Bing , Chen Kun , Feng Zhe-Jun
来源:[J].Optik - International Journal for Light and Electron Optics(IF 0.524), 2017, Vol.135, pp.305-307
摘要:Abstract(#br)Normally, the beam divergence angle is estimated by help of the ratio of the wavelength and the aperture of the collimating system, i.e., λ / d . This method is too inaccurate for a quantitative analysis of the collimating system. In this paper, a convenient met...
作者:... Dai Jianqiang , Chen Kun , Xia Hong
来源:[J].World Neurosurgery(IF 1.765), 2018, Vol.115, pp.105-109
摘要:Background(#br)Posterior occipitocervical fusion surgery is a commonly used surgical method to treat various craniovertebral junction pathologies. Though it is an effective method, there also have been some reports about complications of occipitocervical fusion. However, there ha...
作者:... Jin Yi , Chen Kun , Yao Zhixin
来源:[J].Optics Communications(IF 1.438), 2003, Vol.224 (4), pp.289-293
摘要:Abstract(#br)Application of G criterion to efficient operation of pulsed discharge-excited R–M transition metal vapor laser was successfully extended to univalent ionic lasing medium from neutral atomic lasing medium on the basis of analyzing the simulation results of 1.09 μ...
作者:... Jin, Mingjuan , He, Wenjiong , Chen, Kun
来源:[J].International Journal of Environmental Research and Public Health(IF 1.605), 2015, Vol.12 (7), pp.7172-7184
摘要:Forecasting the disease burden of the elderly will contribute to make a comprehensive assessment about physical and mental status of the elderly in China and provide a basis for reducing the negative consequences of aging society to a minimum. This study collected data from a pub...

我们正在为您处理中,这可能需要一些时间,请稍等。

资源合作:cnki.scholar@cnki.net, +86-10-82896619   意见反馈:scholar@cnki.net

×