中国科学院机构知识库网格系统: 检索

An efficient blue phosphor Ba2Lu5B5O17 Ce3+ stabilized by La2O3 Photoluminescence properties and potential use in white LEDs 期刊论文 OAI收割
Dyes and Pigments, 2018, 卷号: 154, 页码: 121-127
作者: Xiao, Y.; Hao, Z. D.; Zhang, L. L.; Wu, H.; Pan, G. H.

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Ce3+ Ba-2(Lu0.98La0.02)(5)B5O17 Single phase Blue phosphor Photoluminescence emitting phosphor energy-transfer luminescence properties crystal-structure rare-earth light ce3+ enhancement tb3+ gd Chemistry Engineering Materials Science

Magnetic and Transport Properties of Mn0.98Cr0.02Te Epitaxial Films Grown on Al2O3 Substrates 期刊论文 OAI收割
Journal of Materials Science & Technology, 2014, 卷号: 30, 期号: 2, 页码: 103-106
Z. H. Wang; D. Y. Geng; J. Li; Y. B. Li; Z. D. Zhang

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Magnetic properties Mn0.98Cr0.02Te films X-ray diffraction Epitaxial film electronic-structure mnte mnse

A sub-pixel extraction method for the center of the circular structure from spot array calibration target (EI CONFERENCE) 会议论文 OAI收割
2012 3rd International Conference on Information Technology for Manufacturing Systems, ITMS 2012, September 8, 2012 - September 9, 2012, Qingdao, China
作者: Liu Y.; Zhang T.; Yang H.; Gao X.; Liu Y.

收藏 | 浏览/下载：83/0 | 提交时间：2013/03/25

The imaging measurement system must be calibrated before application. In calibration procedure sub-pixel center extraction is the crucial step for the final accuracy. In this paper a new sub-pixel extraction method is proposed. Edge detection at pixel level is obtained using LOG operator then sub-pixel edge detection is realized using the Facet model. Finally the least squares ellipse fitting is operated on the sub-pixel edge to determine the sub-pixel center. Experiment on a series of simulated images indicates that this algorithm is able to realize the center location accuracy of 0.01-0.02 pixel and meets the requirement of sub-pixel level. (2012) Trans Tech Publications Switzerland.

Effect of adding Cr on magnetic properties and metallic behavior in MnTe film (EI CONFERENCE) 会议论文 OAI收割
作者: Li J.; Li J.; Li J.

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Mn1 - xCrxTe films with x = 0 0.02 and 0.05 was synthesized by pulsed laser deposition and crystallize in hexagonal NiAs-type structure. The spin glass behavior predicted before by Monte Carlo calculation is observed in the MnTe film. This behavior is destroyed by adding Cr in the MnTe film. The temperature dependence of magnetization shows a sharp rise at around 66 K due to the magneto-elastic coupling. Metallic behavior is observed in the MnTe film in the temperature range 120-220 K which is ascribed to the magnetic ordering. The metallic behavior disappears with adding Cr because adding Cr ions destroys the magnetic ordering which is mediated by the sp-d exchange interaction between the Cr ions. 2012 Elsevier B.V.

InGaAs nanoflowers grown by MOCVD (EI CONFERENCE) 会议论文 OAI收割
2012 Spring International Conference on Material Sciences and Technology, MST-S, May 27, 2012 - May 30, 2012, Xi'an, China
作者: Zhang T.

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InGaAs nanoflowers have been prepared on InP substrates by MOCVD using TMIn TMGa and AsH3 as reactive precursors at 420 C. Through observation by scanning electron microscopy we find that InGaAs nanoflowers are composed with blades and rods. The flower patterns are controlled by the growth temperature. The nanoflowers of InGaAs are disappeared when we alter the growth temperature up and down. The InGaAs nanoflowers are In0.98Ga0.02As. (2012) Trans Tech Publications Switzerland.

The research of the accurate measure of static transfer function for the TDI CCD camera (EI CONFERENCE) 会议论文 OAI收割
3rd International Photonics and OptoElectronics Meetings, POEM 2010, November 2, 2010 - November 5, 2010, Wuhan, China
Guo-Ning L.; Long-Xu J.; Jian-Yue R.; Wen-Hua W.; Shuang-Li H.

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In the test course of static transfer function of TDI CCD camera because of the influence that gets environmental and artificial etc. factor the value of static transfer function measured at any time is between unceasing fluctuation so make accuracy reduce. To solve this problem a kind of accurate measurement technique of static transfer function is put forward. First before carrying out the measure of static quiet of transfer function the best test point of transfer function of the TDI CCD camera must be determined it is parallel to guarantee the rectangle target surface of parallel optical pipe and camera focal plane maintenance parallel and again guarantee target strip in rectangle target and TDI CCD in camera focal plane maintenance vertical. TDI CCD catches rectangle target image per 1000 lines of target mark image as a measures sample of static transfer function exclude because of atmosphere tremble twisted vague rectangle target mark image retain 500 distinct and steady target mark image as measure sample set. Then calculate the static transfer function of each measure sample respectively take the average of all static quiet transfer function in measure sample set as the static transfer function of camera. Finally the measure of the static transfer function for TDI CCD camera makes error analysis. Experimental results indicate that the value of the static transfer function of TDI CCD camera measured with this kind of method is 0.2923 with before measurement technique comparison the value of static transfer function has raised 0.02 makes the accuracy of the measure of static transfer function have gotten raising.

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.

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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.

The Effect of Hf on the Oxidation and Corrosion Behavior of Ti0.7Al0.3N Coating Prepared by Arc-Ion Plating 期刊论文 OAI收割
OXIDATION OF METALS, 2009, 卷号: 71, 期号: 1-2, 页码: 63-76
作者: Feng, Changjie; Zhu, Shenglong; Li, Mingsheng; Xin, Li; Wang, Fuhui

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Arc-ion plating (AIP) Ti0.7Al0.3N Ti0.68Al0.30Hf0.02N Oxidation Corrosion

The Effect of Hf on the Oxidation and Corrosion Behavior of Ti0.7Al0.3N Coating Prepared by Arc-Ion Plating 期刊论文 OAI收割
OXIDATION OF METALS, 2009, 卷号: 71, 期号: 1-2, 页码: 63-76
作者: Feng, Changjie; Zhu, Shenglong; Li, Mingsheng; Xin, Li; Wang, Fuhui

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收藏 | 浏览/下载：24/0 | 提交时间：2021/02/02

Arc-ion plating (AIP) Ti0.7Al0.3N Ti0.68Al0.30Hf0.02N Oxidation Corrosion

Design and tolerance analysis of compensator for high order aspheric surface testing (EI CONFERENCE) 会议论文 OAI收割
2009 International Conference on Optical Instruments and Technology - Optoelectronic Measurement Technology and Systems, October 19, 2009 - October 22, 2009, Shanghai, China
作者: Chen X.; Liu W.; Chen X.; Chen X.

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High accuracy is required in surface testing of 90nm nodal point lithography projecting lens. By comparing various aspheric surface testing methods the structure layout of the compensator is a meniscus positive lens combined with a Plano-convex positive lens. The design results indicate that: primary and high order aberrations are balanced well we adopt Offner null compensator to test the aspheric surface in the point diffraction interferometer at last. In this paper MTF exceeds diffraction limit an Offner compensator is presented on the base of the third order aberration theory to test concave aspheric surface root-mean-square (RMS) of wave front error /167. The F-number of the system can achieve F/1.64. By the analysis of the process of aspheric surface testing with the designed system the optical construction parameters of which is determined by introducing equal-quantities spherical aberration to compensate all orders of aspheric coefficients. The field of view of the system is 0.02 a loosen distribution of the tolerance was presented based on the accuracy of measuring apparatus. 2009 SPIE.