中国科学院机构知识库网格系统: 检索

10 kW rectangular laser beam generation with incoherent space combiner 期刊论文 OAI收割
Optik, 2022, 卷号: 260
作者: Tian, Xiao; Bai, Yang; Lei, Guangzhi; Yu, Lidong; Zhou, Jingfeng

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收藏 | 浏览/下载：86/0 | 提交时间：2022/05/07

Incoherent space laser beam combination 10 kW beam combiner Rectangular uniform beam spot Multi-beam laser volumetric heat source Finite element methods Optical lens Thermo-mechanical properties

Practical-time related-key attack on Hummingbird-2 期刊论文 OAI收割
IET INFORMATION SECURITY, 2015, 卷号: 9, 期号: 6, 页码: 321-327
Shi, ZQ; Zhang, B; Feng, DG

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收藏 | 浏览/下载：23/0 | 提交时间：2016/12/13

divide and conquer methods cryptography practical-time related-key attack Hummingbird-2 lightweight cipher MAC functionality cryptographic notion combination points differential equation internal state bits divide and conquer strategy cryptographic S-boxes

Influence of high temperature annealing in nitrogen on upconversion luminescence of -NaYF4: Yb3+, Er3+ hexagonal sub-microplates (EI CONFERENCE) 会议论文 OAI收割
2012 International conference on Function Materials and Nanotechnology, FMN 2012, May 19, 2012 - May 20, 2012, Zhengzhou, China
作者: Zhao J.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

The pure -NaYF4: Yb3+ Er3+ hexagonal sub-microplates were successfully prepared by the combination of coprecipitation and hydrothermal methods using sodium citrate as chelator. The size of them is about 600 nm 400 nm (side length thickness). The obtained sample was divided into two parts and one of them was annealed in nitrogen at 300 C for 2 hours. The crystal structure of the -NaYF4: Yb3+ Er3+ hexagonal sub-microplates before and after annealing treatment is hexagonal phase. Under the excitation of 980 nm diode laser the upconversion luminescence intensity the sample after annealing is much stronger than that of the sample without annealing treatment. High temperature annealing process improved the crystallization of the sample resulting in the decrease of the nonradiative relaxation and the enhancement of the upconversion luminescence. (2012) Trans Tech Publications Switzerland.

Influence of sensitizer concentration on the upconversion luminescence of NaYF4: Yb3+, Er3+ nanoparticles (EI CONFERENCE) 会议论文 OAI收割
2012 2nd International Conference on Machinery, Materials Science and Engineering Applications, MMSE 2012, June 16, 2012 - June 17, 2012, Wuhan, China
作者: Zhao J.; Zhao Y.; Zhao Y.; Zhao Y.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

A series of NaYF4: Yb3+ Er3+ nanoparticles with different doping concentration were successfully prepared by the combination of coprecipitation and hydrothermal methods using sodium citrate as chelator. Upconversion luminescence can be observed in all of the samples at room temperature. Fixed the Er3+ concentration with 1 mol% unchanged the effect of the Yb3+ concentration on the upconversion luminescence of NaYF4: Yb3+ Er3+ samples were studied when the doped Yb3+ concentrations were 0 mol% 1 mol% 2 mol% 5 mol% 10 mol% and 20 mol% respectively. As increasing the Yb 3+ concentration the total intensity of the upconversion luminescence of the samples is increasing while the ratio of red to green emission increases firstly and then decreases. The maximum ratio value is 22.1 when the Yb3+ concentration is 10 mol%. It is found that the cross relaxation and cooperative sensitization effect are the reasons for the phenomenon above. (2012) Trans Tech Publications.

Combination of skip-flat test with Ritchey-Common test for the large rectangular flat (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang L.; Xuan B.; Zhang L.

收藏 | 浏览/下载：24/0 | 提交时间：2013/03/25

The Skip-Flat test and Ritchey-Common test are the well-known methods for large flat mirrors measurement. This paper describes the theories of two methods. The combination of the Skip-Flat test with Ritchey-Common test is proposed. Simulations and experiments of the combination method for testing the large rectangular flat of high aspect ratio are shown. The results of the combination test and direct measurement are presented. In comparison of the methods the combination test is in good agreement with the direct measurement. 2010 Copyright SPIE - The International Society for Optical Engineering.

In vitro susceptibility testing of Aspergillus spp. against voriconazole, itraconazole, posaconazole, amphotericin B and caspofungin 期刊论文 OAI收割
CHINESE MEDICAL JOURNAL, 2010, 卷号: 123, 期号: 19, 页码: 2706-2709
作者: Shi Junyan; Xu Yingchun; Shi Yi; Lue Huoxiang; Liu Yong

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收藏 | 浏览/下载：21/0 | 提交时间：2021/02/02

MICRODILUTION METHODS FILAMENTOUS FUNGI ETEST FUMIGATUS COMBINATION EFFICACY MODEL MICS aspergillus antifungal agents drug resistance antifungal activity

Infrared face recognition using linear subspace analysis (EI CONFERENCE) 会议论文 OAI收割
MIPPR 2009 - Pattern Recognition and Computer Vision: 6th International Symposium on Multispectral Image Processing and Pattern Recognition, October 30, 2009 - November 1, 2009, Yichang, China
作者: Wang D.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

Infrared image offers the main advantage over visible image of being invariant to illumination changes for face recognition. In this paper based on the introduction of main methods of linear subspace analysis such as Principal Component Analysis (PCA) Linear Discriminant Analysis(LDA) and Fast Independent Component Analysis (FastICA) the application of these methods to the recognition of infrared face images offered by OTCBVS workshop are investigated and the advantages and disadvantages are compared. Experimental results show that the combination approach of PCA and LDA leads to better classification performance than single PCA approach or LDA approach while the FastICA approach leads to the best classification performance with the improvement of nearly 5% compared with the combination approach. 2009 Copyright SPIE - The International Society for Optical Engineering.

情感文本分类方法研究 学位论文 OAI收割
工学博士, 中国科学院自动化研究所: 中国科学院研究生院, 2008
作者: 李寿山

收藏 | 浏览/下载：128/0 | 提交时间：2015/09/02

文本分类主题文本分类情感文本分类特征提取方法组合分类器方法领域适应 text classification topic-based text classification sentiment text classification feature selection methods classifier combination methods domain adaptation

Study of navigation based on intelligent avatar with mobile virtual reality 会议论文 OAI收割
IET International Conference on Wireless Mobile and Multimedia Networks Proceedings, ICWMMN 2006,, Hangzhou, China, November 6, 2006 - November 9,2006
Jun, Ma; Hengjun, Zhu; Jianhua, Gong Source

收藏 | 浏览/下载：33/0 | 提交时间：2014/12/07

Recent advances in wireless communications and the hardware performance of handset devices make possible the combination of navigation technology with mobile virtual reality (MVR). In this paper we describe a navigation method that uses intelligent avatar (IA) and been realized in a distributed architecture. In the method complicated A* wayfinding algorithm is applied to obtain the set of smell points (SSP) on PC server (PCS) thereafter handset client (HC) will receive the SSP via wireless network and create an IA to lead the user along the route controlled by the SSP. During navigation the IA can apperceive the status of user's avatar in virtual environment regularly and then adjust its travel speed in order to complete harmoniously the navigation task for the user. Furthermore the rendering of IA adopts the technology of dynamic impostor and the method of distributed rendering. In order to reduce the occupation of wireless network bandwidth we present two methods and name them as levels of action (LOA) and simple texture compression.

多生物特征融合的身份鉴别 学位论文 OAI收割
工学硕士, 中国科学院自动化研究所: 中国科学院研究生院, 2005
王媛

收藏 | 浏览/下载：61/0 | 提交时间：2015/09/02

多生物特征识别多角度步态序列融合融合方法 multi-modal biometrics system combination methods fusion ofmuli-view gait sequence.