中国科学院机构知识库网格系统: 检索

Study on mathematical model construction of typical gorge wind field 期刊论文 OAI收割
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS, 2023, 卷号: 17, 期号: 1, 页码: 2249132
作者: Cheng JH(成炯豪); Sun ZX(孙振旭); Ju SJ(鞠胜军); Yang GW(杨国伟); Mao, Jun

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收藏 | 浏览/下载：34/0 | 提交时间：2023/09/26

Wind field characteristics mathematical model roughness numerical simulation wind speed fitting

Evaluation of Simulated CO₂ Point Source Plumes from High-Resolution Atmospheric Transport Model 期刊论文 OAI收割
REMOTE SENSING, 2023, 卷号: 15
作者: Li, Chao; Wang, Xianhua; Ye, Hanhan; Wu, Shichao; Shi, Hailiang

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收藏 | 浏览/下载：33/0 | 提交时间：2023/11/10

CO2 point source the Lagrangian Particle Dispersion Theory Model the Adaptive Deep Learning Location Matching Method high-resolution DEM and artificial building elements wind field distribution CO2 plume morphology aerial flight observations

The braking index of PSR B0540-69 and the associated pulsar wind nebula emission after spin-down rate transition 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 494, 页码: 1865-1870
作者: HXMT

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收藏 | 浏览/下载：66/0 | 提交时间：2022/02/08

stars: magnetic field stars: neutron pulsars: general Astrophysics - High Energy Astrophysical Phenomena Abstract: In 2011 December, PSR B054-69 experienced a spin-down rate transition (SRT), after which the spin-down power of the pulsar increased by $\sim 36{{\ \rm per\ cent}}$. About 1000 d after the SRT, the X-ray luminosity of the associated pulsar wind nebula (PWN) was found to brighten by $32\pm 8{{\ \rm per\ cent}}$. After the SRT, the braking index n of PSR B0540-69 changes from n = 2.12 to 0.03 and then keeps this value for about five years before rising to n = 0.9 in the following years. We find that most of the current models have difficulties in explaining the measured braking index. One exceptive model of the braking index evolution is the increasing dipole magnetic field of PSR B0540-69. We suggest that the field increase may result from some instabilities within the pulsar core that enhance the poloidal component at the price of toroidal component of the magnetic field. The increasing dipole magnetic field will result in the X-ray brightening of the PWN. We fit the PWN X-ray light curve by two models: one assumes a constant magnetic field within the PWN during the brightening and the other assumes an enhanced magnetic field proportional to the energy density of the PWN. It appears that the two models fit the data well, though the later model seems to fit the data a bit better. This provides marginal observational evidence that magnetic field in the PWN is generated by the termination shock. Future high-quality and high-cadence data are required to draw a solid conclusion.

Analysis of typhoon wind hazard in Shenzhen City by Monte-Carlo Simulation CNKI期刊论文 OAI收割
2019
作者: GUO Yunxia; HOU Yijun; QI Peng

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收藏 | 浏览/下载：4/0 | 提交时间：2024/12/18

typhoon hazard analysis Monte-Carlo simulation wind field model extreme wind speed

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：85/0 | 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.

The measurement of wind erosion through field survey and remote sensing: a case study of the Mu Us Desert, China SCI/SSCI论文 OAI收割
2015
作者: Yue Y. J.; Shi, P. J.; Zou, X. Y.; Ye, X. Y.; Zhu, A. X.

收藏 | 浏览/下载：28/0 | 提交时间：2015/12/09

Wind erosion Quantitative retrieval model Field survey Remote sensing Mu Us Desert vegetation cover semiarid china northwest china northern china dune mobility desertification model sand prediction transport

Modular aircraft simulation platform based on simulink (EI CONFERENCE) 会议论文 OAI收割
2010 IEEE International Conference on Mechatronics and Automation, ICMA 2010, August 4, 2010 - August 7, 2010, Xi'an, China
Chen C.-Q.; Ji Y.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

Aircraft simulation platform is the most important supporting technology in the aircraft development process. This simulation platform can be used for validating the design of subsystem and also it provides the necessary data for the Aircraft design. Wind has great impact on the flight parameter. In order to accurately simulate the wind model and calculate the flight parameters a simulation modeling method for flight parameter simulation platform under wind field environment is established. Firstly the various sub-systems which affecting flight parameters are analyzed some mathematical models of the flight parameter simulation platform is established. Secondly the atmospheric wind field is studied to analyze the impact on its trajectory. Then the model is built in the Simulink toolbox in the Matlab which is based on the principles of hierarchy and modularity using C MEX S-function for the complex kinetic equations. Finally when the models have been established encapsulating models for several subsystem and assembling them for the Aircraft simulation platform based on the unified interface. The simulation tests (including the performance test of a certain gliding Aircraft the wind influence test of a certain uncontrolled aircraft) prove the simulation capability of the platform and its calculating step can reach 1 ms. Comparing simulation with field test data of a certain uncontrolled aircraft it shows that the relative deviation of range is 0.47% the relative deviation of maximal altitude is 2.1%. Taking relevant standards as a reference standard it is demonstrated the platform is reliable meets the engineering accuracy requirements. 2010 IEEE.

Comparison of a new model with previous models for the low-latitude magnetopause size and shape 期刊论文 iSwitch采集
Chinese science bulletin, 2010, 卷号: 55, 期号: 2, 页码: 179-187
作者: Lin RuiLin; Zhang XiaoXin; Liu SiQing; Wang YongLi; Gong JianCun

收藏 | 浏览/下载：31/0 | 提交时间：2019/05/10

Low-latitude magnetopause size and shape Solar wind dynamic pressure Interplanetary magnetic field b(z) Magnetopause model

Global disturbance currents in the ionosphere during storms 期刊论文 OAI收割
Journal of Atmospheric and Solar-Terrestrial Physics, 2006, 卷号: 68, 期号: 7, 页码: 793-802
Shen, C. S.; Zi, M. Y.; Wang, J. S.; Xu, J. Y.; Liu, S. L.

收藏 | 浏览/下载：35/0 | 提交时间：2014/04/30

magnetic storm disturbance current system ionospheric dynamo thermospheric wind electric conductivity driving electric field at the polar cap boundary model dynamo field

Global patterns of Joule heating in the high-latitude ionosphere 期刊论文 OAI收割
Journal of Geophysical Research-Space Physics, 2005, 卷号: 110, 期号: A12, 页码: A12208
Zhang, X. X.; Wang, C.; Chen, T.; Wang, Y. L.; Tan, A.; Wu, T. S.; Germany, G. A.; Wang, W.

收藏 | 浏览/下载：21/0 | 提交时间：2014/04/30

interplanetary magnetic-field height-integrated conductivity polar-cap potentials energy flux solar-wind thermosphere-ionosphere auroral substorms empirical-model poynting flux neutral winds