中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共5条，第1-5条

帮助

条数/页：排序方式：
	Characteristics, diffusion, and exposure risk of bioaerosol pollution during haze period on a campus of central China 期刊论文 OAI收割 AIR QUALITY ATMOSPHERE AND HEALTH, 2022, 页码: 1-13 作者: Wang, Yanjie; Zhang, Song; Yang, Liying; Song, Huiling; Zhou, Guoyu \| 收藏 \| 浏览/下载：19/0 \| 提交时间：2023/02/06 Haze Bioaerosol Existing characteristics Trajectory prediction Risk assessment
	Effects of bedding planes on mechanical characteristics and crack evolution of rocks containing a single pre-existing flaw 期刊论文 OAI收割 ENGINEERING GEOLOGY, 2021, 卷号: 293, 页码: 18 作者: Liu, Liwang; Li, Haibo; Chen, Shihai; Shao, Zhushan; Zhou, Chuanbo \| 收藏 \| 浏览/下载：94/0 \| 提交时间：2021/10/27 Discrete element method Bedding plane Pre-existing flaw Mechanical characteristics Crack evolution Rock slope stability
	An improved hyperspectral classification algorithm based on back-propagation neural networks (EI CONFERENCE) 会议论文 OAI收割 2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2012, June 1, 2012 - June 3, 2012, Nanjing, China 作者: Yu P.; Yu P. 收藏 \| 浏览/下载：34/0 \| 提交时间：2013/03/25 In this paper a new method is proposed to improve the classification performance of hyperspectral images by combining the principal component analysis (PCA) genetic algorithm (GA) and artificial neural networks (ANNs). First some characteristics of the hyperspectral remotely sensed data such as high correlation high redundancy etc. are investigated. Based on the above analysis we propose to use the principal component analysis to capture the main information existing in the hyperspectral images and reduce its dimensionality consequently. Next we use neural networks to classify the reduced hyperspectral data. Since the back-propagation neural network we used is easy to suffer from the local minimum problem we adopt a genetic algorithm to optimize the BP network's weights and the threshold. Experimental results show that the classification accuracy is improved and the time of calculation is reduced as well. 2012 IEEE.
	Lightweight design and analysis of support structure of certain UAV engine (EI CONFERENCE) 会议论文 OAI收割 2012 International Conference on Electrical Insulating Materials and Electrical Engineering, EIMEE 2012, May 25, 2012 - May 27, 2012, Shenyang, Liaoning, China Xing X.; Liu B.; Han X.; Jia H. 收藏 \| 浏览/下载：31/0 \| 提交时间：2013/03/25 Support structure of UAV (Unmanned Aerial Vehicle) engine is the important support for UAV engine playing a support role and bearing extremely complex load so its lightweight strength and dynamic characteristics have a great influence on high performance of UAV. This paper focuses on UAV having the requirement of high performance and stability to the support structure of engine and uses the software of MSC.Patran and MSC.Nastran and topology optimization criterion to lightweight design and analysis the support structure of UAV engine under the premise condition of existing constraints. Then the static strength and modal are analyzed for the result of lightweight design and the strength of the model and dynamic characteristics are verified. (2012) Trans Tech Publications Switzerland.
	The research of chromatic aberration arose from the deviation of same function family at the single primary in full-color display (EI CONFERENCE) 会议论文 OAI收割 ICO20: Illumination, Radiation, and Color Technologies, August 21, 2005 - August 26, 2005, Changchun, China 作者: Chen Y. 收藏 \| 浏览/下载：15/0 \| 提交时间：2013/03/25 The deviations of primary display characteristics often bring about many complex chromatic aberrations on the color gamut. Among kinds of existing situations caused by deviation of primaries the emphasis of this paper is confined to the deviation of same function family at the single primary for smoothing away differences. The purpose of this paper is two fold. First luminance aberration of facsimile color which arises out of special deviations is discussed from many aspects and the three-dimensional gamut model of luminance aberration is proposed. The second goal is drawn on the color aberration arose from these deviations of primaries and the three-dimensional gamut with vectors has been introduced to demonstrate the feature of these aberrations whereas the difficulties of describing the distribution of color aberration. All these conclusions can be utilized to appraise the quality of the display fidelity.