中国科学院机构知识库网格系统: 检索

The effect of porosity size and oxidation on the HCF property of nickel-based single crystal superalloy at 980 degrees C 期刊论文 OAI收割
THEORETICAL AND APPLIED FRACTURE MECHANICS, 2022, 卷号: 120, 页码: 16
作者: Jiang, Wen; Li, Piao; Yao, Wei-Xing; Rui, Shao-Shi; Shi, Hui-Ji

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收藏 | 浏览/下载：40/0 | 提交时间：2022/08/02

Nickel-based single crystal superalloys High-cycle fatigue life Fatigue limit Porosity size Oxidation

Strain gradient induced grain refinement far below the size limit in a low carbon hypoeutectoid steel (0.19 wt% C) via pipe inner surface grinding treatment 期刊论文 OAI收割
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2021, 卷号: 78, 页码: 155-169
作者: Li, Wenqiang; Zhao, Yiming; Liu, Ning; Li, Changji; Ren, Ruiming

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收藏 | 浏览/下载：97/0 | 提交时间：2021/10/15

Strain gradient Grain refinement Size limit Low carbon hypoeutectoid steel Pipe inner surface grinding

A Content-Adaptive Method for Image Denoising 期刊论文 OAI收割
IEEE Access, 2019, 卷号: 7, 页码: 183222-183235
作者: Chen, Hao; He, Yi; Wei, Ling; Li, Xiqi; Yang, Jinsheng

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收藏 | 浏览/下载：17/0 | 提交时间：2021/05/06

Image denoising structural complexity patch size patch number denoising limit content-adaptive

Preferences for Floor Plans of Medium-Sized Apartments: A Survey Analysis in Beijing, China SCI/SSCI论文 OAI收割
2013
Gao X. L.; Asami Y.; Zhou Y. M.; Ishikawa T.

收藏 | 浏览/下载：23/0 | 提交时间：2014/12/24

Housing design preference floor plan size limit space syntax privacy housing demand dwelling type space syntax design choice future

Parameter optimization of passive dynamic walking biped with knees (EI CONFERENCE) 会议论文 OAI收割
2012 2nd International Conference on Materials Science and Information Technology, MSIT 2012, August 24, 2012 - August 26, 2012, Xi'an, Shaan, China
作者: Zhang P.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

A method to find the optimized parameter values of passive dynamic walking biped is presented. The effects of biped physical parameters on the stability property of passive gaits are studied by simulation experiments. The chosen parameters include the mass distribution length of leg and slope angle. The stability property of passive walking limit cycles is used as criterion of optimization calculation including the orbital stability described by eigen-values of linearized Poincare map and the global property described by size of attraction region. The simulation results show how the stability of limit cycle varies when physical parameters of the passive biped change. The work is useful to explore the inherent property of passive dynamic walking and can be used as an important instruction in the mechanical design of biped robots based on principle of passive dynamic walking. (2012) Trans Tech Publications Switzerland.

Electro-optical imaging system identification using pseudo-random binary pattern (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Le Y.; Jian W.; Jianzhong Z.; Qiang S.; Jianzhuo L.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

A method using pseudo-random binary pattern is developed for electro-optical imaging system identification. The imaging system is taken as a stable linear time-invariant and causal filter and its transfer function is measured through the pseudo-random binary sequence impulse responses identification. A digital mirror device (DMD) light projector is developed as the target generator and wavelet thresholding is used to denoise the captured image. Pre-filtering spectral estimation algorithm with adaptive parameter selection is also proposed for the identification process overcoming the challenge brought by the size limit derived from the optical isoplantic region. Simulations and experiments are presented to show the effectiveness of the proposed method.0-64. 2010 IEEE.

Modulation transfer function measurement of sampled imaging systems in field test (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Yang L.; Zhang J.; Zhang J.; Zhang J.; Wang J.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

A digital mirror device (DMD) based light projector was developed as the target generator in modulation transfer function (MTF) measurement. In order to overcome the sampling-scene phase effect in MTF measurement of sampled imaging systems a method using random targets is introduced to yield a phase-averaged MTF. The main potential problem of implementing this method is the fact that the stationary assumption of the random targets may be vitiated in practical measurement especially in field test due to the ill condition. We provide an efficient model-independent way of analyzing and isolating the spectral contents arising from these additional contributions to MTF measurement. Algorithms with adaptive parameter selection were also developed for spectral estimation of the test image in order to overcome the challenge brought by the size limit of the test matrices for one certain field of view derived from the isoplantic region. The MTF measurement of a CCD video imager is used to demonstrate the measurement technique and illustrate the benefits over other methods. In order to validate the results comparisons have been made between MTF measurements of imager implemented using this method and bar target direct measurements. 2010 Copyright SPIE - The International Society for Optical Engineering.

Effect of rock mass structure and block size on the slope stability - physical modeling and discrete element simulation 期刊论文 iSwitch采集
Science in china series e-engineering & materials science, 2005, 卷号: 48, 页码: 1-17
作者: Li, SH; Lian, ZZ; Wang, JG

收藏 | 浏览/下载：26/0 | 提交时间：2019/05/10

Rock masses Slope stability Dem simulation Block size effect Joints configuration effect Limit equilibrium method

CMOS APS imaging system application in star tracker (EI CONFERENCE) 会议论文 OAI收割
Advanced Materials and Devices for Sensing and Imaging II, November 8, 2004 - November 10, 2004, Beijing, China
作者: Li J.; Liu Y.; Liu Y.; Liu Y.; Liu J.

收藏 | 浏览/下载：58/0 | 提交时间：2013/03/25

Small satellites are capable of performing space explore missions that require accurate attitude determination and control. However low weight size power and cost requirements limit the types of attitude sensor of small craft such as CCD are not practical for small satellites. CMOS APS is a good substitute for attitude sensors of small craft. Some of the technical advantages of CMOS APS are no blooming single power low power consumption small size and little support circuitry direct digital output simple to system design in particular radiation-hard characteristic compare with CCD. This paper discusses the application probability of CMOS APS in star tracker for small satellites further more a prototype ground-based star camera based on STAR250 CMOS image sensor has been built. In order to extract stars positions coordinates subpixel accuracy centroiding algorithm has been developed and tested on some ground-based images. Moreover the camera system star sensitivity and noise model are analyzed and the system accuracy is been evaluated. Experimental results indicate that a star camera based on CMOS APS is a viable practical attitude sensor appropriate for space small satellites.

Estimation of maximum inclusion size and fatigue strength in high-strength ADF1 steel 期刊论文 OAI收割
Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 2005, 卷号: 394, 期号: 1-2, 页码: 126-131
J. M. Zhang; J. F. Zhang; Z. G. Yang; G. Y. Li; G. Yao; S. X. Li; W. J. Hui; Y. Q. Weng

收藏 | 浏览/下载：17/0 | 提交时间：2012/04/14

high-strength steel size of maximum inclusion statistics of extreme values generalized Pareto distribution fatigue strength generalized pareto distribution clean steels quantitative-evaluation quality-control extreme values statistics defects prediction limit