中国科学院机构知识库网格系统: 检索

Tidal currents-induced scour development around pile foundations: Effects of flow velocity hydrograph 期刊论文 OAI收割
COASTAL ENGINEERING, 2024, 卷号: 191, 页码: 20
作者: Wang, Shun-Yi; Qi, Wen-Gang; Li, Biao; Wang, Chen; Gao, Fu-Ping

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收藏 | 浏览/下载：23/0 | 提交时间：2024/06/27

Local scour Tidal currents Pile foundation Flume experiment Dimensionless effective flow work Equivalent velocity

Deep Geophysical Anomalies Beneath the Changbaishan Volcano 期刊论文 OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2023, 卷号: 128, 期号: 4, 页码: 12
作者: Li, Shaohua; Li, Jiaqi; Ferrand, Thomas P. P.; Zhou, Tong; Lv, Mingda

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收藏 | 浏览/下载：15/0 | 提交时间：2024/01/02

intraplate volcanism low-velocity anomaly partial melting effective moduli mantle transition zone phase transition

A New Set of Parameters of High-Mass X-ray Binaries Found with their Cyclotron Lines 期刊论文 OAI收割
arXiv e-prints, 2018
作者: Zhang, Chengmin; Taani, Ali; Chaty, Sylvain; Karino, Shigeyuki; Song, Liming

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收藏 | 浏览/下载：77/0 | 提交时间：2019/07/12

Astrophysics - High Energy Astrophysical Phenomena Abstract: We have derived new physical quantities for several High-Mass X-ray Binaries (HMXBs) with supergiant (SG) companions through their cyclotron lines. The parameters are: the terminal velocity of the wind, the mass loss rate of the donor, the effective temperature and the magnetic fields. These parameters influence significantly the improvement of the model of accretion. In spite of the variety of their observational properties, the corresponding magnetic field is around B ~ 10^12 G. This result can be constrained by the effects on stellar evolution. In addition, we have performed a segmentation in the parameter space of donors intended for several SG-HMXB listed in our sample set. The parameter space can be categorized into five regimes depending on the possibility of disk formation associated with accretion from the stellar wind. This can give a quantitative clarification of the observed variability and the properties of these objects. We show that, when these systems come into the direct accretion region, systems with corresponding parameters can emit X-rays.

Evaluation of equivalent medium methods for stress wave propagation in jointed rock mass 期刊论文 OAI收割
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, 2013, 卷号: 37, 期号: 7, 页码: 701-715
作者: Ma, G. W.; Fan, L. F.; Li, J. C.

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收藏 | 浏览/下载：27/0 | 提交时间：2018/06/05

equivalent medium method jointed rock mass wave attenuation effective velocity frequency spectrum analysis

A parametric study of effective phase velocity of surface waves in layered media 期刊论文 OAI收割
COMPUTERS AND GEOTECHNICS, 2012, 卷号: 44, 页码: 176-184
作者: Cui, Yu-Jun; Wei, Chang-Fu; Chai, Hua-You

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收藏 | 浏览/下载：20/0 | 提交时间：2018/06/05

Thin layer stiffness matrix method Surface waves Mode Dispersion Effective phase velocity Mode incompatibility

Analyse the angular velocity estimation errors of -- filter based on high sampling rate (EI CONFERENCE) 会议论文 OAI收割
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
作者: Zhang Y.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

In order to get angular velocity of stabilization servo mechanism from angular position sensors -- filter based on high sampling rate was established model and error characteristics were analyzed. With the hypothesis of constant acceleration -- filter and its angular velocity transfer function were deduced. Combing with optimum parameters the effects of and sample rate on the error characteristics were evaluated. According to the requirements of stabilization servo mechanism the frequency characteristics of angular velocity transfer function are analyzed and the filter parameters are designed. The experimental which filter tracked and smoothed sinusoidal signal the results show that when the cutoff frequency of angular velocity loop is 44.9rad/s sampling period and parameters are 0.08ms and 0.01279 respectively the phase leading of angular position is 70. -- filter tracked sinusoidal signals with maximum angular velocity(30/s) and maximum angular acceleration(30/s2) the error of angular velocity estimation was 0.053/s. In the engineering of electro-optical stabilization servo mechanism -- filter can reduce noise effectively and reached the requirement of platform angular velocity estimation. Also it is one of the effective methods to get angular velocity from angular position sensors. 2011 IEEE.

The angular velocity estimation principal of -- filter based on high sampling rate (EI CONFERENCE) 会议论文 OAI收割
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
作者: Zhang Y.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

In order to get angular velocity of stabilization servo mechanism from angular position sensors -- filter and its angular velocity transfer function were predigested. Combing with optimum parameters -- filter based on high sampling rate was established the effect of and sample rate on filter nature frequency were evaluated. According to the requirements of stabilization platform the principle of steady and transient tracking filter differential were proved. With the hypothesis of constant acceleration the frequency characteristics of angular velocity transfer function were analyzed three-dimensional Kalman filter was simplified and the filter parameters were designed. The results show that when the spectrum of input signal was lower than 6rad/s parameters was 0.02 and sampling period were 0.08ms and 0.1ms respectively the filter can realize differential exactly when the spectrum was 9rad/s the precision was no less than 1.1% the phase leading of angular position was no less than 70 the natural frequency should be higher than the cut-off frequency of stabilization platform was two or three times. In the engineering of electro-optical stabilization servo mechanism -- filter has properties of tracking differential and reached the requirement of platform angular velocity estimation. Also it is one of the effective methods to get angular velocity from angular position sensors. 2011 IEEE.

Analysis of effects of active sources on observed phase velocity based on the thin layer method 期刊论文 OAI收割
JOURNAL OF APPLIED GEOPHYSICS, 2011, 卷号: 73, 期号: 1, 页码: 49-58
作者: Lu, Ying-Fa; Chai, Hua-You; Phoon, Kok-Kwang; Wei, Chang-Fu

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收藏 | 浏览/下载：27/0 | 提交时间：2018/06/05

Near-field effects Surface waves Mode Thin layer stiffness method Effective phase velocity

Attitude determination of small, dim and high-speed targets based on multi-CMOS intersecting system (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Information Science and Engineering, ICISE2010, December 4, 2010 - December 6, 2010, Hangzhou, China
作者: Li M.; Zhao L.; Wang J.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

In order to measure attitude of small dim and high-speed targets in shooting range intersecting system based on multiple high-speed CMOS cameras was introduced in this paper. CMOS cameras were laid near from objects for small size using multiple CMOS cameras to compose intersecting system for big number of targets tested and selecting CMOS camera between CMOS and CCD for low cost and considering damage to measurement equipment of objects tested. Pitch angle and yaw angle were measured by extracting axle wire through image processing image sequences were obtained from cameras laying on two sides. Velocity of objects was calculated by least square curve-fitting acquiring coordinate of centroid on image received by CMOS camera laying below effective viewing field. One CMOS camera was laid on right ahead for measuring roll angle. Station mode introduced in this paper has virtue of low cost and free extending. 2010 IEEE.

Determination of the Maximum Effective Burning Velocity of Dust-Air Mixtures in Constant Volume Combustion 期刊论文 OAI收割
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES, 2007, 卷号: 20, 期号: 4-6, 页码: 462-469
作者: Pu Y K; Jia F; Wang SF(王双峰); Skjold T

收藏 | 浏览/下载：30/0 | 提交时间：2016/01/11

dust explosion constant volume combustion maximum effective burning velocity