浅议期刊出版质量与其光盘版的检索     

方劲松 《大学图书情报学刊》2003,21(2):63-64

以《中国学术期刊(光盘版)》为例，探讨入编期刊出版质量对其光盘版检索效率的影响，认为期刊在出版录方面应统一、规范，以提高检索效率。  相似文献   

基于ILASII的随书光盘管理与使用     

鲍智明 《图书馆学研究》2006,(12):39-41

本文结合福建师范大学图书馆的实际应用,介绍在ILASII系统下对随书光盘的管理。  相似文献   

随书光盘的综合管理与利用   总被引：12，自引：1，他引：12  

彭骏  耿亦兵 《图书馆杂志》2004,23(1):37-39

本文分析了各种随书光盘管理利用的特点，提出了图书馆应综合应用各种方法来处理随书光盘的观点，以提高随书光盘的使用率，并就这些方法的具体实施作了说明。  相似文献   

镜像服务器在我馆的应用   总被引：1，自引：0，他引：1  

白莉娜 《图书馆建设》2004,(1):56-57

本文论述了镜像服务器的功能和特点,并介绍了其在本馆电子阅览室中的应用及使用方法。  相似文献   

平稳正态过程反正弦定理在信号谱估计中的应用     

戴聪 《青岛大学师范学院学报》1997,(2)

本文利用平稳过程反正弦定理估计了信号的相关西数和话密度，实例计算表明本文所述方法与实测结果相当一致。  相似文献   

Er:LN晶体的生长和激光性能研究     

茹占军  毕建聪  谢家兴  徐小龙 《宁波职业技术学院学报》2005,9(2):90-92

在LiNbO5中掺进(0、0．5、1．0、1．5mol％)Er2O5，以Czochrals技术生长LiNbO5、Er(1mol％)：LiNbO3、Er(2mol％)：LiNbO3、Er(3mol％)：LiNbO3晶体。测试Er：LiNbO3晶体的吸收光谱，确定晶体的泵浦波长，Er：LiNbO3晶体的吸收变相对LiNbO3晶体发生红移，红移的程度随Er^3 浓度的增加而增大。测试Er：LiNbO3晶体的荧光光谱，Er：LiNbO3晶体易实现激光震荡的波长4115／2→4115／2(～1．5μm)，是制作波导激光器的最合适的波长。测试Er：LiNbO3晶体的光损伤阅值，其结果高于LiNbO3晶体。Er(3mol％)：LiNbO3晶体的光损伤阀值比LiNbO3晶体高一个数量级。  相似文献   

氢原子光谱同位素谱线位移实验的参数优化     

张萍  袁学德  刘力军  曲艳玲 《实验室研究与探索》2011,30(10)

讨论了氢原子光谱实验中狭缝宽度、采集次数和负高压对氢原子光谱同位素位移谱线的影响,优化了氢原子光谱同位素位移实验的工作参数,获得了清晰的氢原子同位素位移光谱。通过该实验让学生掌握实验中多参数优化的方法,有利于加深学生对光谱理论的理解,有利于提高学生分析问题解决问题的能力。  相似文献   

Olivine-norite rock detected by the lunar rover Yutu-2 likely crystallized from the SPA-impact melt pool     

Honglei Lin  Zhiping He  Wei Yang  Yangting Lin  Rui Xu  Chi Zhang  Meng-Hua Zhu  Rui Chang  Jinhai Zhang  Chunlai Li  Hongyu Lin  Yang Liu  Sheng Gou  Yong Wei  Sen Hu  Changbin Xue  Jianfeng Yang  Jie Zhong  Xiaohui Fu  Weixing Wan  Yongliao Zou 《国家科学评论(英文版)》2020,7(5):913

Chang’E-4 landed in the South Pole-Aitken (SPA) basin, providing a unique chance to probe the composition of the lunar interior. Its landing site is located on ejecta strips in Von Kármán crater that possibly originate from the neighboring Finsen crater. A surface rock and the lunar regolith at 10 sites along the rover Yutu-2 track were measured by the onboard Visible and Near-Infrared Imaging Spectrometer in the first three lunar days of mission operations. In situ spectra of the regolith have peak band positions at 1 and 2 μm, similar to the spectral data of Finsen ejecta from the Moon Mineralogy Mapper, which confirms that the regolith''s composition of the landing area is mostly similar to that of Finsen ejecta. The rock spectrum shows similar band peak positions, but stronger absorptions, suggesting relatively fresh exposure. The rock may consist of 38.1 ± 5.4% low-Ca pyroxene, 13.9 ± 5.1% olivine and 48.0 ± 3.1% plagioclase, referred to as olivine-norite. The plagioclase-abundant and olivine-poor modal composition of the rock is inconsistent with the origin of the mantle, but representative of the lunar lower crust. Alternatively, the rock crystallized from the impact-derived melt pool formed by the SPA-impact event via mixing the lunar crust and mantle materials. This scenario is consistent with fast-cooling thermal conditions of a shallow melt pool, indicated by the fine to medium-sized texture (<3 mm) of the rock and the SPA-impact melting model [Icarus 2012; 220: 730–43].  相似文献   

专题数据库光盘发布技术原理及其实践应用     

苏金燕  夏吉安 《河南图书馆学刊》2006,26(6):105-107

当前信息服务机构已纷纷通过建立专题数据库为用户提供信息服务,而专题数据库的发布、使用方式则在很大程度上影响专题数据库的使用效果。首先讨论数据库的一般发布载体,主要有纸张I、nternet和光盘等;其次讨论了专题数据库光盘发布实现的技术、原理;最后给出了此技术的应用、实践实例。  相似文献   

Probability Density Function Method for Observing Reconstructed Attractor Structure   总被引：1，自引：0，他引：1  

陆宏伟  陈亚珠卫青 《上海大学学报(英文版)》2004,8(1):75-79

Probability density function (PDF) method is proposed for analysing the structure of the reconstructed attractor in computing the correlation dimensions of RR intervals of ten normal old men. PDF contains important information about the spatial distribution of the phase points in the reconstructed attractor. To the best of our knowledge, it is the first time that the PDF method is put forward for the analysis of the reconstructed attractor structure. Numerical simulations demonstrate that the cardiac systems of healthy old men are about 6 - 6.5 dimensional complex dynamical systems. It is found that PDF is not symmetrically distributed when time delay is small, while PDF satisfies Gaussian distribution when time delay is big enough. A cluster effect mechanism is presented to explain this phenomenon. By studying the shape of PDFs, that the roles played by time delay are more important than embedding dimension in the reconstruction is clearly indicated. Results have demonstrated that the PDF method represents a promising numerical approach for the observation of the reconstructed attractor structure and may provide more information and new diagnostic potential of the analyzed cardiac system.  相似文献