中国科学院机构知识库网格系统: 检索

Detection and analysis of Galileo signal in space anomalies from 2017 to 2018 期刊论文 OAI收割
IET RADAR SONAR AND NAVIGATION, 2020, 卷号: 14, 期号: 11, 页码: 1690-1696
作者: Fan, Lihong; Tu, Rui; Zhang, Rui; Han, Junqiang; Zhang, Pengfei

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收藏 | 浏览/下载：49/0 | 提交时间：2021/11/29

distance measurement error analysis satellite navigation aircraft landing guidance radio receivers Galileo signal space anomalies broadcast ephemeris user navigation SIS anomaly advanced receiver autonomous integrity monitoring precise ephemeris SIS error healthy Galileo satellites corresponding detection thresholds satellite SIS anomalies satellite clock error SIS stability time 7 0 hour time 2 5 hour time 50 0 hour time 4 5 hour

The hydration mechanism and performance of Modified magnesium oxysulfate cement by tartaric acid 期刊论文 OAI收割
CONSTRUCTION AND BUILDING MATERIALS, 2017, 卷号: 144, 页码: 516-524
作者: Wu, Chengyou; Chen, Wenhai; Zhang, Huifang; Yu, Hongfa; Zhang, Wuyu

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Magnesium Oxysulfate Cement Tartaric Acid Setting Time Compressive Strength 5mg(Oh)(2)Center Dot Mgso4 Center Dot 7h(2)o

Comparison of the Continuity of Vegetation Indices Derived from Landsat 8 OLI and Landsat 7 ETM+ Data among Different Vegetation Types 期刊论文 OAI收割
Remote Sensing, 2015, 卷号: 7, 期号: 10, 页码: 2556-2565
作者: She, Xiaojun; Zhang, Lifu; Cen, Yi; Wu, Taixia; Huang, Changping

收藏 | 浏览/下载：34/0 | 提交时间：2016/04/20

hyperspectral vegetation index continuity Landsat 7 ETM+ Landsat 8 OLI Time series

A strong coupled CFD-CSD method on computational aeroelastity (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
Xi R.; Jia H.

收藏 | 浏览/下载：79/0 | 提交时间：2013/03/25

In this paper a strong coupled CFD-CSD method is developed to simulate the aeroelastic phenomena. The CFD solver is based on the finite-volume algorithm for the Navier-Stokes equations on unstructured grid. The CSD solver solves the aeroelastic governing equations in the modal space. Their coupling is realized by a dual-time method. The spring-based smoothing method is adopted to deform and regenerate the aerodynamic grid. Two test cases are selected to validate the authors' method for static and dynamic aeroelastity .The results of the simulation for the static aeroelastic problems of a missile wing show that the Lift Coefficient and Drag Coefficient are severally 7% and 5% lower than those don't consider the elasticity of the wing. The results for the flutter boundary prediction of the AGARD 445.6 wing have been proved much closer to the experiment than using the DLM. This method can describe the effects of fluid viscosity more exactly for highly nonlinear transonic flight conditions. The calculation has proved reliable in the subsonic regime but not accurate enough in the supersonic regime. 2011 IEEE.

Energy transition between Yb3+-Tm3+-Gd3+ in Gd3+, Yb3+ and Tm3+ Co-doped fluoride nanocrystals (EI CONFERENCE) 会议论文 OAI收割
17th International Conference on Dynamical Processes in Excited States of Solids, DPC'10, June 20, 2010 - June 25, 2010, Argonne, IL, United states
作者: Zhang J.; Zhang J.; Zhang J.

收藏 | 浏览/下载：29/0 | 提交时间：2013/03/25

YF3: 20%Gd3+ 20%Yb3+ 0.5%Tm3+ nanocrystal has been synthesized by a hydrothermal method. The upconversion (UC) emission and energy transfer progresses between Gd3+-Yb 3+-Tm3+ under a 980-nm continuous wave semiconductor laser diode excitation have been explored. The experimental results show that the violet and ultraviolet (UV) enhancement with Tm3+ upconversion emission occurs in the nanocrystal and in the same time the UC emissions of Gd3+ from 6D9/2 6IJ 6P5/2 and 6P7/2 states to the ground state 8S7/2 are obtained too. The dynamic analysis implies that under 980-nm excitation the nanocrystal dimension plays a key role in the efficient energy transfer processes between Gd3+-Yb 3+-Tm3tt based on the energy matching conditions. 2011 Published by Elsevier B.V.

Observations and analysis of extreme ultraviolet emission between 10nm and 70nm by capillary discharge with Xe as target (EI CONFERENCE) 会议论文 OAI收割
2011 Academic International Symposium on Optoelectronics and Microelectronics Technology, AISOMT 2011, October 12, 2011 - October 16, 2011, Harbin, China
作者: Yang L.; Yang L.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

Spectra have been recorded from a Xe discharge capillary discharge source in the extreme ultraviolet (EUV) region between 10nm and 70nm. The origin of the spectra have been analyzed which have shown that the spectra between 10nm and 20nm come from the transitions of 4p-4d 4d-4f and 4d-5p by Xe 7+Xe12+ and the spectra between 20nm70nm mainly from the transitions of Xe6+Xe8+ as well. The results which have been integrated the experimental results with the theory have shown that the spectra from Xe6+Xe8+ formed in the time after the collapsed of the compressing of the plasma. 2011 IEEE.

Research of error correction of LEO satellite orbit prediction for vehicle-borne tracking and position device (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
作者: Wang J.-J.; Guo L.-H.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

Vehicle-borne tracking and position device is used to track LEO satellite. Because of the absence of the target which might be caused by cloud or zenith blind zone the forecasting data will be used to acquire the target. While orbit prediction has serious errors the target is always missed. Meanwhile in its application to the vehicle-borne tracking and position device due to the base of instability in the tracking process it will result in significant difference between predicting data and tracking data so the target will be not tracked rapidly. We applied tracking data to predict satellite orbits by improving Laplace method and then corrected the error between Predicted data and actual measured data by interpolation method of Lagrange which improves the accuracy of prediction values. The testing data shows the accuracy of predicted data ranging from 3' to 10" for both azimuth and elevation when extrapolated satellite orbit to 7 seconds time. 2010 IEEE.

Bootstrap loader design of aerospace payload controller based on TSC695F (EI CONFERENCE) 会议论文 OAI收割
2010 2nd International Conference on Computational Intelligence and Natural Computing, CINC 2010, September 13, 2010 - September 14, 2010, Wuhan, China
Xu W.; Piao Y.

收藏 | 浏览/下载：45/0 | 提交时间：2013/03/25

Anti-radiation TSC695F is usually used as aerospace payload controller in tasks to ensure the aerospace payload having extremely high reliability in abominable space environment. The processor bases on SP ARC V7 architecture with parity check and EDAC so it could design out high reliable bootstrap loader to guarantee the operation system of VxWorks and application codes loaded correctly and worked stable and high effective. First this paper put forward the system hardware composition and boot mode which apply for aerospace payload then it makes clear the related contents of register group initialization stack initialization system hardware initialization in bootstrap loader of TSC695F and give out the method to establish TRAP table. That's all through comparing different type of organize mode of program image. After that compiling of target codes have been described and the kernel code of MakeFile had been given at the same time for reference aimed at the realization of engineering. Although this paper is based on TSC695F but it could be extended to other embedded system based on SP ARC for bootstrap loader analysis and design for example the TSC697 which based on SP ARC V8 with higher performance so this paper has extremely high engineering value. 2010 IEEE.

Investigation of the structures and electronic spectra of two coumarins with heterocyclic substituents through TD-DFT calculations 期刊论文 OAI收割
JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM, 2008, 卷号: 859, 期号: 1-3, 页码: 73-78
作者: Zhao, Wenwei; Bian, Wensheng

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收藏 | 浏览/下载：22/0 | 提交时间：2019/04/09

7-aminocoumarin Electronic Spectra Time-dependent Density Functional Theory Excited States

Investigation of the structures and electronic spectra of two coumarins with heterocyclic substituents through td-dft calculations 期刊论文 iSwitch采集
Journal of molecular structure-theochem, 2008, 卷号: 859, 期号: 1-3, 页码: 73-78
作者: Zhao, Wenwei; Bian, Wensheng

收藏 | 浏览/下载：20/0 | 提交时间：2019/05/10

7-aminocoumarin Electronic spectra Time-dependent density functional theory Excited states