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浏览/检索结果: 共5条，第1-5条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Determining the Age for the Red Giants KIC 9145955 and KIC 9970396 by Gravity-dominated Mixed Modes 期刊论文 ASTROPHYSICAL JOURNAL, 2022, 卷号: 931, 期号: 1 作者:  Zhang, Xinyi;  Cai, Tao;  Li Y(李焱);  Wu T(吴涛) 收藏  |  浏览/下载：20/0  |  提交时间：2022/06/06 复杂基质中金属及其化合物纳米材料的 形态分析方法研究 学位论文 博士, 北京: 中国科学院研究生院, 2016 作者:  周小霞 收藏  |  浏览/下载：60/0  |  提交时间：2017/08/08 纳米颗粒，形态分析，金属纳米颗粒，金属离子，元素质量粒径分布  Nanoparticles, Speciation analysis, Metal nanoparticles, Metal ions, Elemental mass size distribution   微型流化床煤半焦水蒸汽气化反应特性与动力学研究 学位论文 工程硕士: 中国科学院研究生院, 2014 季颖 收藏  |  浏览/下载：60/0  |  提交时间：2015/06/04 水蒸汽气化    煤半焦    急冷    微型流化床反应分析仪    反应动力学   Estimation algorithm of mobile OFDM CFOs based on step-size (EI CONFERENCE) 会议论文 2009 International Conference on Information Engineering and Computer Science, ICIECS 2009, December 19, 2009 - December 20, 2009, Wuhan, China Lin L.; Qiao Y.-F.; Su W.-X. 收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25 In order to maintain orthogonality among subcarriers for mobile OFDM  a CFOs step-size estimation model is established to avoid severe performance degradation caused by ICI  and algorithmic stability  step-size parameter  the error of CFOs estimate and etc are investigated. First  after an averaging window algorithm is introduced  the mathematic model of step-size estimation algorithm is obtained through step-size parameter and time-varying CFOs. Then  based on the results of MATLAB simulation  the determination of step-size parameter  the advantages of step-size algorithm and precision are discussed. Finally  time sequence plots of added CP  interleaver and subcarrier modulation with VHDL are presented. Experimental results indicate that the maximum of CFOs errors is 0.00987 in 3 variance interval  when mobile velocity is 400 km/h  according with verdicted principle that in order for the ICI effects to be negligible  the error of CFOs estimation must be accurate within 1-2% of the subcarrier spacing  and programs can correctly implement on circuit board. 2009 IEEE.   Search model of slip surface and stability analysis of multi-step slope 期刊论文 Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering, 2006, 卷号: 25, 期号: SUPPL. 1, 页码: 2841-2847 作者:  Li, Zhong;  Zhu, Yanpeng 收藏  |  浏览/下载：6/0  |  提交时间：2020/11/14 Computer applications  Functions  Geometry  Mathematical models  Safety factor  Soil mechanics  Surfaces  Circular slice method  Computer search model  Multi step slope  Slip surface