中国科学院机构知识库网格系统: 检索

Valuation of Land-Use/Land-Cover-Based Ecosystem Services in Afghanistan-An Assessment of the Past and Future 期刊论文 OAI收割
LAND, 2022, 卷号: 11, 期号: 11, 页码: 32
作者: Najmuddin, Omaid; Li, Zhihui; Khan, Rabnawaz; Zhuang, Weiqing

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收藏 | 浏览/下载：24/0 | 提交时间：2022/12/20

ecosystem services value value coefficient DLS scenario analysis land use change

Valuation of Land-Use/Land-Cover-Based Ecosystem Services in Afghanistan-An Assessment of the Past and Future 期刊论文 OAI收割
LAND, 2022, 卷号: 11, 期号: 11, 页码: 32
作者: Najmuddin, Omaid; Li, Zhihui; Khan, Rabnawaz; Zhuang, Weiqing

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收藏 | 浏览/下载：18/0 | 提交时间：2022/12/20

ecosystem services value value coefficient DLS scenario analysis land use change

塔里木河干流区土地利用与生态系统服务价值的变化/Analysis on Land Use Changes and Ecosystem Services Value in the Area along the Tarim River[J] 期刊论文 OAI收割
中国沙漠, 2013, 卷号: 33, 期号: 6, 页码: 1912-1920
作者: 白元; 徐海量; 凌红波; 傅荩仪; 中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室,新疆乌鲁木齐830011

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收藏 | 浏览/下载：18/0 | 提交时间：2017/12/29

土地利用变化生态服务价值敏感性分析塔里木河干流 Land Use Change Ecological Service Value Sensitivity Coefficient Mainstream Of Tarim River

Multi-focus image fusion algorithm based on adaptive PCNN and wavelet transform (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wu Z.-G.; Wang M.-J.; Han G.-L.

收藏 | 浏览/下载：77/0 | 提交时间：2013/03/25

Being an efficient method of information fusion image fusion has been used in many fields such as machine vision medical diagnosis military applications and remote sensing.In this paper Pulse Coupled Neural Network (PCNN) is introduced in this research field for its interesting properties in image processing including segmentation target recognition et al. and a novel algorithm based on PCNN and Wavelet Transform for Multi-focus image fusion is proposed. First the two original images are decomposed by wavelet transform. Then based on the PCNN a fusion rule in the Wavelet domain is given. This algorithm uses the wavelet coefficient in each frequency domain as the linking strength so that its value can be chosen adaptively. Wavelet coefficients map to the range of image gray-scale. The output threshold function attenuates to minimum gray over time. Then all pixels of image get the ignition. So the output of PCNN in each iteration time is ignition wavelet coefficients of threshold strength in different time. At this moment the sequences of ignition of wavelet coefficients represent ignition timing of each neuron. The ignition timing of PCNN in each neuron is mapped to corresponding image gray-scale range which is a picture of ignition timing mapping. Then it can judge the targets in the neuron are obvious features or not obvious. The fusion coefficients are decided by the compare-selection operator with the firing time gradient maps and the fusion image is reconstructed by wavelet inverse transform. Furthermore by this algorithm the threshold adjusting constant is estimated by appointed iteration number. Furthermore In order to sufficient reflect order of the firing time the threshold adjusting constant is estimated by appointed iteration number. So after the iteration achieved each of the wavelet coefficient is activated. In order to verify the effectiveness of proposed rules the experiments upon Multi-focus image are done. Moreover comparative results of evaluating fusion quality are listed. The experimental results show that the method can effectively enhance the edge details and improve the spatial resolution of the image. 2011 SPIE.

Relationship between Surface Pollen and Modern Vegetation in Southwestern China 期刊论文 OAI收割
JOURNAL OF MOUNTAIN SCIENCE, 2010, 卷号: 7, 期号: 2, 页码: 176–186
Pan Tao; Dai Erfu; Wu Shaohong

收藏 | 浏览/下载：33/0 | 提交时间：2013/08/12

Longitudinal range-gorge region (LRGR) Pollen assemblage Vegetation R-value Coefficient of similarity

Relationship between Surface Pollen and Modern Vegetation in Southwestern China SCI/SSCI论文 OAI收割
2010
作者: Pan T.

收藏 | 浏览/下载：30/0 | 提交时间：2012/06/08

Longitudinal range-gorge region (LRGR) Pollen assemblage Vegetation R-value Coefficient of similarity glacial-maximum midholocene precipitation patterns records norway europe taxa

Algorithm of image enhancement based on order morphology transformation (EI CONFERENCE) 会议论文 OAI收割
2009 International Forum on Information Technology and Applications, IFITA 2009, May 15, 2009 - May 17, 2009, Chengdu, China
作者: Liu Y.; Liu Y.; Liu Y.

收藏 | 浏览/下载：14/0 | 提交时间：2013/03/25

A method based Tsallis entropy and order morphology transform for gray image enhancement is proposed in this article. The order morphology transform method improves the evaluation guide of transform and chose the percentile value and structure B value by the Maximum Tsallis entropy of the area where the coefficient q is 0.8 enhances the gray image. Experiments show that the method enhances the image contrast and suppressing noise and extracting edge. The histogram and gray value show that the image contrast is improved. 2009 IEEE.

High speed, low memory image coding using zero blocks of wavelet coefficients (EI CONFERENCE) 会议论文 OAI收割
4th International Conference on Image and Graphics, ICIG 2007, August 22, 2007 - August 24, 2007, Chengdu, China
作者: Zhang T.; Yang W.-G.

收藏 | 浏览/下载：33/0 | 提交时间：2013/03/25

We propose a new high speed low memory SPECK image coder based on the form of block-unit states called LBUS-SPECK which uses the form of block-unit states and the form of block exponents to substitute LIS and LSP of SPECK. A form of block-unit states is introduced to store the significance flag of coefficients and the value of the block-unit exponents. A form of block exponents is introduced to store the block exponents which are used to represent the max coefficient in a decomposed block. A new block depth-finding strategy is developed for searching insignificant sets at sorting stage. Experimental results show that the obtained PSNR values for the decoded images are very close to those of SPECK algorithm and the memory consumption is reduced by 9 times the encoding timing is saved about 15%. Comparing with SPECK algorithm this algorithm not only has better performance of the decoded images but also is easy to implement especially it provides an efficient way for hardware implementation of wavelet embedded block coding. 2007 IEEE.

Low drive-voltage and high-bandwidth electro-optic modulators based on BaTiO3 thin-film waveguides (EI CONFERENCE) 会议论文 OAI收割
Science and Technology of Dielectrics for Active and Passive Photonic Devices - 210th Electrochemical Society Meeting, October 29, 2006 - November 3, 2006, Cancun, Mexico
Sun D. G.; Fu X. H.; Liu Z. F.; Ho S. T.; Wessels B. W.

收藏 | 浏览/下载：45/0 | 提交时间：2013/03/25

We investigated electro-optic modulator structures to target low drive voltage high-speed modulation and small device size with c-axis grown BaTiO3/MgO ferro-electric thin films. In this study the calculations are focused on the ideal thin film with a quadratic relation between the half-wave drive voltage V and the interaction length L in the electro-optic modulation case we obtained in previous work. With the quadratic electro-optic modulating relation and the optimal rib waveguide structure of BaTiO3/MgO thin films the frequency-voltage-size performances for 2.5GHz 10GHz 40GHz and 100GHz modulation bandwidths have been obtained under half-wave drive voltages of 0.8V 1.6V 3.0V and 4.8V respectively for the ideal film with r51=730 pm/V at 1550nm wavelength where both the phase velocity matching condition and the conductor induced microwave attenuation are considered. The required device lengths to achieve these four typical values of modulation bandwidth are 3.3 mm 0.8 mm 0.4 mm and 0.2 mm respectively. With the c-axis grown BaTiO3/MgO crystal thin films and the quadratic electro-optic modulating relation an electro-optic coefficient of reff=180 pm/V for the c-axis grown BaTiO3/MgO ferro-electric thin films was measured which is relatively far from the ideal value of r51=560 pm/V. copyright The Electrochemical Society.

Spectroscopic investigations of Er3+ doped Bi2O 3 -B2O3 -SiO2 glass (EI CONFERENCE) 会议论文 OAI收割
ICO20: Materials and Nanostructures, August 21, 2005 - August 26, 2005, Changchun, China
作者: Chen B.; Wang X.; Wang X.; Wang X.; Wang C.

收藏 | 浏览/下载：74/0 | 提交时间：2013/03/25

From the optical absorption measurements the Judd-Ofelt parameters were computed using Judd-Ofelt theory. According to the radiative lifetime obtained from the Judd-Ofelt parameters and the measured lifetime the 1.5m quantum efficiency was calculated. The quenching effect of OH upon the lifetime of 1.5m emission was investigated. From the absorption sideband measurement of glass host the value of optical band gap was estimated. The McCumber theory was used to calculate the stimulated emission cross-section and in approximate agreement with experimental one if the emission spectrum could be obtained accurately. The gain coefficient spectra were computed.