中国科学院机构知识库网格系统: 检索

A Micro Mid-Infrared Spectroscopic Study of Chang'e-5 Sample 期刊论文 OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 2022, 卷号: 127, 期号: 8, 页码: 16
作者: Yang, Yazhou; Jiang, Te; Liu, Yang; Xu, Yuchen; Zhang, Hao

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收藏 | 浏览/下载：31/0 | 提交时间：2023/04/06

Chang'e-5 mission lunar soil micro mid-infrared spectroscopy optical constant silicate minerals glass

基于MAD光流计算近地面大气光学湍流参数 期刊论文 OAI收割
光学学报, 2022, 卷号: 42
作者: 郭一鸣; 吴晓庆; 青春; 刘庆; 王志远

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收藏 | 浏览/下载：16/0 | 提交时间：2023/11/10

atmospheric optics MAD optical flow calculation turbulence angle-of-arrival fluctuation variance refractive index structure constant of atmospheric turbulence 大气光学 MAD光流计算湍流到达角起伏方差大气湍流折射率结构常数

Investigation on the Growth and Properties of Six Garnet Single Crystals with Large Lattice Constants 期刊论文 OAI收割
CRYSTAL RESEARCH AND TECHNOLOGY, 2021
作者: Han, Zhiyuan; Sun, Dunlu; Zhang, Huili; Luo, Jianqiao; Quan, Cong

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收藏 | 浏览/下载：41/0 | 提交时间：2021/04/26

garnet structure large lattice constant laser host magneto‐ optical substrate thermal property transmission spectrum

Synchronous X-ray/Optical QPOs from the Black Hole LMXB MAXI J1820+070 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2021
作者: HXMT

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收藏 | 浏览/下载：52/0 | 提交时间：2022/02/08

black hole physics Low Mass X-ray Binaries accretion accretion discs stars: individual (MAXI J1820+070) Astrophysics - High Energy Astrophysical Phenomena Abstract: We present high-speed optical photometry from SAAO and SALT on the black hole LMXB MAXI J1820+070 (ASSASN-18ey), some of it simultaneous with NICER, Swift and Insight-HXMT X-ray coverage. We detect optical Quasi-Periodic Oscillations (QPOs) that move to higher frequencies as the outburst progresses, tracking both the frequency and evolution of similar X-ray QPOs previously reported. Correlated X-ray/optical data reveal a complex pattern of lags, including an anti-correlation and a sub-second lag that evolve over the first few weeks of outburst. They also show correlated components separated by a lag equal to the QPO period roughly centered on zero lag, implying that the inter-band variability is strongly and consistently affected by these QPOs at a constant phase lag of roughly ±Ю The synchronisation of X-ray and optical QPOs indicates that they must be produced in regions physically very close to each other we thus propose that they can be explained by a precessing jet model, based on analogies with V404 Cyg and MAXI J1348-630.

Performance analysis of 1-km free-space optical communication system over real atmospheric turbulence channels 期刊论文 OAI收割
OPTICAL ENGINEERING, 2017, 卷号: 56, 期号: 10, 页码: 5
作者: Liu, Dachang; Wang, Zixiong; Liu, Jianguo; Tan, Jun; Yu, Lijuan

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收藏 | 浏览/下载：31/0 | 提交时间：2019/06/17

atmospheric turbulence free-space optical communication refractive-index structure constant

Modification of optical and electrical properties of sol-gel-derived TiO2-doped ZrO2 gate dielectrics by annealing temperature 期刊论文 OAI收割
JOURNAL OF ALLOYS AND COMPOUNDS, 2016, 卷号: 688, 期号: 无, 页码: 252-259
作者: Xiao, D. Q.; He, G.; Liu, M.; Gao, J.; Jin, P.

收藏 | 浏览/下载：49/0 | 提交时间：2017/10/18

High-k Gate Dielectrics Optical Constant Electrical Properties Ti incorporaTion Sol-gel Conduction Mechanisms

Synthesis and properties of soluble cross-linkable fluorinated co-polyimides 期刊论文 OAI收割
Reactive & Functional Polymers, 2014, 卷号: 82, 页码: 58-65
H. Y. Yao; Y. H. Zhang; K. Y. You; Y. Liu; Y. Song; S. Y. Liu; S. W. Guan

收藏 | 浏览/下载：29/0 | 提交时间：2015/01/14

Crosslinking Fluorinated polyimides Solubility Refractive index Dielectric constant performance functional polyimides different pendant groups imide oligomers poly(ether imide)s optical-properties diamine phthalimide polymers moieties cure

Fabrication of high-efficiency ultraviolet blazed gratings by use of direct Ar2-CHF3 ion-beam etching through a rectangular photoresist mask (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, May 24, 2011 - May 26, 2011, Beijing, China
Tan X.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

In ultraviolet spectroscopy groove irregularity and surface roughness of nanometer magnitude can cause a significant loss of diffraction efficiency. Therefore there is a constant need to improve the diffraction efficiency. A blazed grating can concentrate most of the light intensity into a desired diffraction order it is important to control the groove shape precisely so it is the optimum choice among gratings of different kinds of profile. As the operating wavelength of most UV spectral applications is less than 200 nm especially the blaze angle and the apical angle. We have presented a direct shaping method to fabricate EUV blazed gratings by using an ion-beam mixture of Ar+ and CHF2 +to etch K9 glass with a rectangular photoresist mask. With this method the required blaze angle is small we have succeeded in fabricating well-shaped UV blazed gratings with a 1200 line/mm groove density and 8.54 blaze angles and 1200 line/mm groove density and 11.68 blaze angles and the metrical efficiency is about 81% and 78%. The good performance of the gratings was verified by diffraction efficiency measurements. When one uses the etching model the conditions on the ion-beam grazing incident angle and the CHF3partial pressure should be noted. Besides since the etched groove shape depends on the aspect ratio of the photoresist mask ridge if we wish to fabricate larger gratings with this method we must improve the uniformity of the photoresist mask before ion-beam etching. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

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：28/0 | 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.