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浏览/检索结果: 共11条，第1-10条 帮助

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Study on Driving Factors and Spatial Effects of Environmental Pollution in the Pearl River-Xijiang River Economic Belt, China 期刊论文  OAI收割
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH, 2022, 卷号: 19, 期号: 11, 页码: 13
作者:  Liang, Yutian;  Zhang, Jiaxi;  Zhou, Kan
  |  收藏  |  浏览/下载：39/0  |  提交时间：2022/09/21
Study on Driving Factors and Spatial Effects of Environmental Pollution in the Pearl River-Xijiang River Economic Belt, China 期刊论文  OAI收割
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH, 2022, 卷号: 19, 期号: 11, 页码: 13
作者:  Liang, Yutian;  Zhang, Jiaxi;  Zhou, Kan
  |  收藏  |  浏览/下载：37/0  |  提交时间：2022/09/21
Spatial patterns and social-economic influential factors of population aging: A global assessment from 1990 to 2010 期刊论文  OAI收割
SOCIAL SCIENCE & MEDICINE, 2020, 卷号: 253, 页码: 9
作者:  Wang, Shaobin
  |  收藏  |  浏览/下载：47/0  |  提交时间：2021/03/23
Spatial patterns and social-economic influential factors of population aging: A global assessment from 1990 to 2010 期刊论文  OAI收割
SOCIAL SCIENCE & MEDICINE, 2020, 卷号: 253, 页码: 9
作者:  Wang, Shaobin
  |  收藏  |  浏览/下载：20/0  |  提交时间：2021/03/23
The inequality of educational resources and its countermeasures for rural revitalization in southwest China 期刊论文  OAI收割
JOURNAL OF MOUNTAIN SCIENCE, 2020, 卷号: 17, 期号: 2, 页码: 304-315
作者:  Guo, Yuan-zhi;  Zhou, Yang;  Liu, Yan-sui
  |  收藏  |  浏览/下载：22/0  |  提交时间：2020/05/19
The inequality of educational resources and its countermeasures for rural revitalization in southwest China 期刊论文  OAI收割
JOURNAL OF MOUNTAIN SCIENCE, 2020, 卷号: 17, 期号: 2, 页码: 304-315
作者:  Guo, Yuan-zhi;  Zhou, Yang;  Liu, Yan-sui
  |  收藏  |  浏览/下载：14/0  |  提交时间：2020/05/19
The inequality of educational resources and its countermeasures for rural revitalization in southwest China 期刊论文  OAI收割
JOURNAL OF MOUNTAIN SCIENCE, 2020, 卷号: 17, 期号: 2, 页码: 304-315
作者:  Guo, Yuan-zhi;  Zhou, Yang;  Liu, Yan-sui
  |  收藏  |  浏览/下载：17/0  |  提交时间：2020/11/11
Estimating the environmental Kuznets curve for ecological footprint at the global level: A spatial econometric approach 期刊论文  OAI收割
ECOLOGICAL INDICATORS, 2013, 卷号: 34, 期号: 34, 页码: 15-21
作者:  Wang, Yong;  Kang, Lingyan;  Wu, Xiaoqing;  Xiao, Yang
收藏  |  浏览/下载：28/0  |  提交时间：2013/08/13
Simulation and experiment of the static FTIR based on micro multi-step mirrors (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
作者:  Liang Z.-Z.;  Zhang J.;  Zhang J.;  Zhang J.;  Zhu W.-B.
收藏  |  浏览/下载：30/0  |  提交时间：2013/03/25
In recent years  Fourier transform spectrometer (FTS) with small size and low mass is required in many applications with growing need for real-time and small platform spectral detection. In this paper  a micro Fourier transform infrared spectrometer (FTIR) based on spatial modulation mode was designed. This spectrometer has the advantages of high stability and simplified configuration. It also promises optical path differences (OPD) with high precision  as MOEMS technology is used in manufacturing the key components. The simulation and the experiments with regard to this FTIR configuration have been done. Firstly  the diffraction effect of the micro multi-step mirrors (MMSMs) is studied. We discuss the influence to the reversed spectrum by different mirror widths and different diffraction distances. Secondly  we simulate and analyze the influence of the source solid angle to the spectral resolution. Thirdly  we set up the theoretical model of the collimation error which is mainly from the defocus of the optical system and analyze the result caused by the collimation error. Fourthly  a new discrete Fourier transform arithmetic using least-squares cosines progression (LSCP) is proposed which can reconstruct the spectrum with nonuniform sampled signals. Finally  the MMSMs are fabricated used the MOEMS technology and the structural parameters are tested. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  
The method on the measurement of the aircraft attitude by the spatial cosines relationship of the single station and planes to the intersection the multi-station of electro-optical theodolite (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
Zhao L.-R.; Cao Y.-G.
收藏  |  浏览/下载：16/0  |  提交时间：2013/03/25
In order to realize the aircraft attitude measurement  The paper advances electro-optical theodolite methods of measuring the aircraft attitude by using the spatial cosines relationship the single station theodolite and how to use intersection of the multi-station theodolite. The single station theodolite was introduced in a measured distance from the aircraft posture information. An exhaustive approach was used to access to the aircraft axis of the feature points and the location in the space was used to obtain space posture parameters. The multi-station theodolite was introduced to get the information of the aircraft flight attitude by method of using planes to the intersection. Two-dimensional image to obtain objective axis by fitting algorithm using Hough transform. And then  Calculate the vertical distance of the origin to the target of the central axis and the origin to the target of the central axis of the angle between the normal and the X-axis obtaining the linear equation in the two-dimensional plane. Two-dimensional axis of the target image and the camera system's optical center only identified a space plane. The aircraft yaw axis angle and pitch angle can be obtained by getting the space axis using plains to the intersection method. Experimental results show that attitude angle error of the single station theodolite is less than 1 when its distance is less than 6000m and attitude angle error of the multi-station theodolite is less than 0.6 when its intersection angle is between 30 and 150. In this paper  according to test result of precision comparing the mathematical model is correct and the algorithm is reasonable in extracting effective parameters of the aircraft's attitude. 2010 IEEE.