机构

• 力学研究所 [1]
• 长春光学精密机械与物... [1]
• 数学与系统科学研究院 [1]

采集方式

• OAI收割 [3]

内容类型

• 会议论文 [2]
• 期刊论文 [1]

发表日期

• 2011 [1]
• 2008 [1]
• 1999 [1]

学科主题

• Mechanics [1]

筛选

浏览/检索结果: 共3条，第1-3条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择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作者升序作者降序 A physico-chemical model of seepage flows in reservoirs during alkaline flooding 会议论文  OAI收割 6th International Conference on Fluid Mechanics, Guangzhou, PEOPLES R CHINA, JUN 30-JUL 03, 2011 作者:  Zhang Z(张珍);  Li JC(李家春) 收藏  |  浏览/下载：27/0  |  提交时间：2013/02/26 oil recovery  alkali agent  strong base  weak base  RECOVERY  OIL   A high-accuracy parameter estimation algorithm for jointless Frequency-shift track circuit (EI CONFERENCE) 会议论文  OAI收割 ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM 2008, August 3, 2008 - August 4, 2008, Guangzhou, China 作者:  Zheng X. 收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25 FSK (Frequency Shift keying) signal  which has advantages of narrow-bandwidth  strong anti-interference ability  long transmission distance and so on  is used in jointless Frequency-shift track circuit to send different kinds of control signals. However  as FSK is non-linearly modulated  parameter estimation with high accuracy is hard to realize. Based on the spectrum analysis complement with time-frequency distribution  a highaccuracy FSK signal parameter estimation algorithm is put forward in this paper. According to the signal characteristics  under-sampling and ZFFT are used to improve the accuracy of spectrum analysis  and the base frequency resolution meets system requirement of 0.02Hz. Wigner-Ville distribution has an excellent time-frequency concentration while serious cross-term interference at the same time. Through the design of kernel function  the cross-terms are almost suppressed and the upper/down side frequency resolution meets the system requirement of 0.2Hz. The effectivities of all the methods mentioned above have been proved by MATLAB simulation  which pave a solid way for the development of high-accuracy FSK signal parameter estimation devices. 2008 IEEE.   Strong efficiency in a locally convex space 期刊论文  OAI收割 MATHEMATICAL METHODS OF OPERATIONS RESEARCH, 1999, 卷号: 50, 期号: 3, 页码: 373-384 作者:  Cheng, YH;  Fu, WT   |  收藏  |  浏览/下载：7/0  |  提交时间：2018/07/30 base for a cone  proper efficiency  strong efficiency