中国科学院机构知识库网格系统: 检索

Spatial Patterns and Scaling Distributions of Earthquake-Induced Landslides - A Case Study of Landslides in Watersheds Along Dujiangyan–Wenchuan Highway 期刊论文 OAI收割
Frontiers in Earth Science, 2021, 卷号: 9, 期号: 1, 页码: 1-12
作者: Xuemei Liu; 苏鹏程(Su PengCheng); Yong Li; Rui Xu; Jun Zhang

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收藏 | 浏览/下载：34/0 | 提交时间：2022/03/25

Earthquake Landslide Hot Spot Analysis Frequency Curve Scaling Distribution Spatial Pattern

Crustal structure underneath central China across the Tibetan Plateau, the North China Craton, the South China Block and the Qinling-Dabie Orogen constrained by multifrequency receiver function and surface wave data 期刊论文 OAI收割
JOURNAL OF ASIAN EARTH SCIENCES, 2020, 卷号: 202, 页码: 15
作者: Wei, Zigen; Li, Zhiwei; Chen, Ling; Chu, Risheng; Wu, Shanshan

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收藏 | 浏览/下载：26/0 | 提交时间：2020/12/07

Crustal structure Craton and orogen Lower crustal flow Multi-frequency receiver function Phase velocity dispersion curve

Mapping favorable groundwater potential recharge zones using a GIS-based analytical hierarchical process and probability frequency ratio model: A case study from an agro-urban region of Pakistan 期刊论文 OAI收割
GEOSCIENCE FRONTIERS, 2020, 卷号: 11, 期号: 5, 页码: 1805-1819
作者: Arshad, Arfan; Zhang, Zhijie; Zhang, Wanchang; Dilawar, Adil

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收藏 | 浏览/下载：31/0 | 提交时间：2021/03/18

Weightage overlay Analytical hierarchical process (AHP) analysis Frequency ratio (FR) Vulnerability Groundwater recharge zones Area under curve (AUC)

A software tool to plot frequency and cumulative frequency curves automatically for grain size analysis of sediments 期刊论文 OAI收割
EARTH SCIENCE INFORMATICS, 2020, 卷号: 13, 期号: 2, 页码: 565, 571
作者: Xu, Antao; Hu, Peng; Chen, Zhong; Shu, Chan; Wang, Xuesong

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收藏 | 浏览/下载：106/0 | 提交时间：2020/09/22

Sediment Grain size analysis Grain size distribution Cumulative frequency curve Statistical analysis

2D FEM modeling on the multi-channel transient electromagnetic method 期刊论文 OAI收割
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 2018, 卷号: 61, 期号: 12, 页码: 5084-5095
作者: Wang Ruo; Wang MiaoYue; Di QingYun; Xue GuoQiang

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收藏 | 浏览/下载：63/0 | 提交时间：2019/03/04

2D FEM modeling MTEM method High and low frequency correction Isochronic curve Isochronic section

The nature and the mechanism of crack initiation and early growth for very-high-cycle fatigue of metallic materials - An overview 会议论文 OAI收割
Catania, ITALY, JUN 20-24, 2016
作者: Hong YS(洪友士); Sun CQ(孙成奇); Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.

收藏 | 浏览/下载：85/0 | 提交时间：2018/01/16

High-strength Steels Chromium-bearing Steel Regime N-greater-than-10(7) Cycles Severe Plastic-deformation Ion Mass-spectrometry Long-life Fatigue Very-high-cycle Fatigue Fatigue Crack Initiation Fine-granular-area Nanograins High-strength Steels Titanium Alloyss-n Curve Ti-6al-4v Alloy Propagation Mechanism Ultrasonic Frequency

Effects of strength level and loading frequency on very-high-cycle fatigue behavior for a bearing steel 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF FATIGUE, 2012, 卷号: 38, 页码: 46-56
作者: Zhao AG(赵爱国); Xie JJ(谢季佳); Sun CQ(孙成奇); Lei ZQ(雷铮强); Hong YS(洪友士)

收藏 | 浏览/下载：65/0 | 提交时间：2013/01/18

Very-high-cycle fatigue Strength level Frequency effect Crack initiation Fatigue mechanism S-N Curve Subsurface Crack Initiation Low-Alloy Steel Gigacycle Fatigue Life Regime Mechanism Failure KHz

The application of Kalman filtering technique on the multi-position strap-down north seeking system (EI CONFERENCE) 会议论文 OAI收割
2012 5th International Symposium on Computational Intelligence and Design, ISCID 2012, October 28, 2012 - October 29, 2012, Hangzhou, China
作者: Liu S.-J.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

In order to fit the sin wave curve of a multiposition strap-down north seeking system and to calculate the real north angle accurately the data collected from the Dynamically tuned gyro(DTG) must be filtered firstly to reduce the noise jamming. The principles of the system are introduced. The factors influencing the measuring precision are also analyzed. Then The DTG data are processed by second-order Butterworth filtering and Kalman filtering together. Experimental results indicate that the built-up filtering method can reduce noise jamming more effectively than second-order Butterworth filtering in the low frequency. 2012 IEEE.

Space camera dynamic image quality measurement and evaluation (EI CONFERENCE) 会议论文 OAI收割
3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China
作者: Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

By using analysis of the infinity image of the space camera we intend to obtain the curve of the dynamic modulation transfer function. We extract the pixel gray values at the image edge which distribute as a knife-edge function and make differential calculation and Fourier transformation of it and then we can obtain the dynamic MTF curve of the optical system. The value of the curve at the Nyquist frequency is the most important parameter that reflects the image quality. We add push-scanning imaging and environmental effects to the static MTF of space camera and compare the MTF value with the dynamic MTF at Nyquist frequency. The comparison result can help us verify the accuracy of the calculating results and the feasibility of our method. (2011) Trans Tech Publications.

The Research of real time auto-recognition of the moire fringe (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wang M.-J.; Wu Z.-G.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

Measuring the movement of raster by the method of moire fringe has the advantage of high sensitivity high resolution and non-contacted measurement. The characteristic of moire fringe is that the image is white alternate with black the angle of the stripes is uniform the width of the stripes is uniform the terminators of the stripes aren't clear. A fast method that can figure out the width and angle of the moire fringe precisely is put forward in this paper. It calculates the angle the stripes firstly. According to the principle of the minimum mean squared error (MMSE) the closer a series of data is the smaller the value of the MMSE will be. The method is described as follows: It takes the image's center as the origin 180 beelines pass through the origin with the same angle interval. it calculates the value of the minimum mean squared error of the 180 beelines and find out the least one among those then the angle of the moire fringe comes out primarily. In order to improving the calculating precision of moire fringe 60 equal angles are divided in the neighborhood of the angle then a precise angle of moire fringe is calculated according to the principle of the MMSE. After getting out the angle of the moire fringe we begin to calculate the width of moire fringe. A line vertical with the moire fringe is drawn and we can get the width of the moire fringe by the vertical line. In order to get over the influence of the noise an effective area with the shape of diamond is selected in the image. The data of area is accumulated and projected according to the direction of moire fringe and a sine curve come out. The width of moire fringe can be obtained by getting the position of the first wave crest the position of the last wave crest and the number of wave crest. Experiments prove that the precision of the method put forward in this paper is enhanced in comparison with the traditional frequency method the precision of width calculation achieves to 99.6% according to the evaluation indicators of width detection error. The computing speed is boosted largely compared with traditional method and it can achieve with 15 ms that satisfying the demand of real time. 2011 SPIE.