oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2018 ( 14 )

2017 ( 15 )

2016 ( 20 )

2015 ( 188 )

自定义范围…

匹配条件: “Linlin Ge” ,找到相关结果约6035条。
列表显示的所有文章,均可免费获取
第1页/共6035条
每页显示
Selective Weighting of Undecimated Wavelet Coefficients for Noise Reduction in SAR Interferograms
Vidhyasaharan Sethu,Eliathamby Ambikairajah,Linlin Ge
EURASIP Journal on Advances in Signal Processing , 2008, DOI: 10.1155/2008/378092
Abstract: This paper describes a technique for noise reduction in synthetic aperture radar interferometry. The noisy interferogram is decomposed using undecimated wavelet transform and the coefficients are weighted. A novel method for computing the weights for each subband, based on an estimate of the relative noise content in them, is presented with a median filter used as the noise estimator. The proposed technique is not optimised for any specific signal or noise models. Results show that this technique provides an improvement of around 15% over the conventional boxcar filter in terms of estimated height error of a digital elevation model constructed from the filtered interferogram.
Detecting Zimbabwe’s Decadal Economic Decline Using Nighttime Light Imagery
Xi Li,Linlin Ge,Xiaoling Chen
Remote Sensing , 2013, DOI: 10.3390/rs5094551
Abstract: Zimbabwe’s economy declined between 2000 and 2009. This study detects the economic decline in different regions of Zimbabwe using nighttime light imagery from the Defense Meteorological Satellite Program’s Operational Linescan System (DMSP-OLS). We found a good correlation (coefficient = 0.7361) between Zimbabwe’s total nighttime light (TNL) and Gross Domestic Product (GDP) for the period 1992 to 2009. Therefore, TNL was used as an indicator of regional economic conditions in Zimbabwe. Nighttime light imagery from 2000 and 2008 was compared at both national and regional scales for four types of regions. At the national scale, we found that nighttime light in more than half of the lit area decreased between 2000 and 2008. Moreover, within the four region types (inland mining towns, inland agricultural towns, border towns and cities) we determined that the mining and agricultural sectors experienced the most severe economic decline. Some of these findings were validated by economic survey data, proving that the nighttime light data is a potential data source for detecting the economic decline in Zimbabwe.
Pasture Monitoring Using SAR with COSMO-SkyMed, ENVISAT ASAR, and ALOS PALSAR in Otway, Australia
Xin Wang,Linlin Ge,Xiaojing Li
Remote Sensing , 2013, DOI: 10.3390/rs5073611
Abstract: Because of all-weather working ability, sensitivity to biomass and moisture, and high spatial resolution, Synthetic aperture radar (SAR) satellite images can perfectly complement optical images for pasture monitoring. This paper aims to examine the potential of the integration of COnstellation of small Satellites for the Mediterranean basin Observasion (COSMO-SkyMed), Environmental Satellite Advanced Synthetic Aperture Radar (ENVISAT ASAR), and Advanced Land Observing Satellite Phased Array type L-band Synthetic Aperture Radar (ALOS PALSAR) radar signals at horizontally emitted and received polarization (HH) for pasture monitoring at the paddock scale in order to guide farmers for better management. The pasture site is selected, in Otway, Victoria, Australia. The biomass, water content of grass, and soil moisture over this site were analyzed with these three bands of SAR images, through linear relationship between SAR backscattering coefficient, and vegetation indices Normalized Differential Vegetation Index (NDVI), Normalized Difference Water Index (NDWI), Enhanced Vegetation Index (EVI)), together with soil moisture index (MI). NDVI, NDWI, and MI are considered as proxy of pasture biomass, plant water content, and soil moisture, respectively, and computed from optical images and climate data. SAR backscattering coefficient and vegetation indices are computed within a grass zone, defined by classification with MODIS data. The grass condition and grazing activities for specific paddocks are detectable, based on SAR backscatter, with all three wavelengths datasets. Both temporal and spatial analysis results show that the X-band SAR has the highest correlation to the vegetation indices. However, its accuracy can be affected by wet weather due to its sensitivity to the water on leaves. The C-band HH backscattering coefficient showed moderate reliability to evaluate biomass and water content of grass, with limited influence from rainfall in the dry season. The L-band SAR is the less accurate one for grass biomass measurement due to stronger penetration.
基于差分雷达干涉测量的矿区地面沉降监测研究
董玉森, ge,linlin chang,hsingchun 张 志
武汉大学学报(信息科学版) , 2007,
Abstract: ?收集了1992年12月至1998年6月jers-1l波段雷达数据,利用差分雷达干涉测量技术进行地面沉降监测研究。通过“二轨法”进行差分处理,选择其中的6景差分雷达干涉图进行分析。在研究区内发现了4个沉降区域,并按照时间序列通过对地面形变图进行分析,获取其中两个沉降区最大的垂直沉降量。
基于有向窗的自适应sigma中值滤波算法
许才军,王 华,王江林,ge,linlin
武汉大学学报(信息科学版) , 2005,
Abstract: ?提出了一种能够有效消除insardem噪声的自适应中值滤波算法:基于有向窗的自适应sigma中值滤波。分别采用中值滤波、基于高程的自适应sigma中值滤波和基于有向窗的自适应sigma中值滤波算法,对insartandemdem和模拟dem进行了滤波处理。结果表明,基于有向窗的自适应sigma中值滤波算法不仅能够更有效地消除噪声,而且能够更好地保留图像的边界特征。
OPTICAL FIBRE SENSOR FOR GROUNDWATER TEMPERATURE GRADIENT MEASUREMENT IN DEEP WELL
光纤深井水温梯度传感器

Ge Linlin,Yu FeipengInstitute of Seismology,State Seismological Bureau,
葛林林
,俞飞鹏

光子学报 , 1990,
Abstract: 深井水温梯度精确地反映了地表热流量的大小。本文先简述了地表热流量与地震预报的关系,然后介绍了地表热流测量技术的现状,最后详细报告了精度达10~(-5)到10~(-6)℃、一次可测得10~(-5)个热流值的光纤深井水温梯度传感器的理论和实验研究结果。
利用块体-位错模型反演华北地区块体运动和断裂活动
朱泽,孟国杰,苏小宁,金红林,胡新康,Ge Linlin
大地测量与地球动力学 , 2014,
Abstract: ?对华北地区1999以来的GPS观测数据进行处理,得到统一的GPS速度场。建立华北地区块体位错模型,利用模拟退火方法,反演主要块体的运动速率和断裂的活动性参数。研究表明,相对华南块体,研究区内各块体的欧拉角速度较小,且都为顺时针运动,断裂活动性相对较弱。整体上张家口蓬莱构造带处于左旋运动,运动速率约为1mm/a,西段和东段表现出不同的性质,闭锁深度分别为40km和30km。山西断裂带具有一定程度的右旋走滑,走滑速率约为1mm/a,断裂锁定深度为30km。郯庐断裂带表现为右旋走滑,走滑速率在1mm/a左右,断裂锁定深度为40km。
The Expression of the Drazin Inverse with Rank Constraints
Linlin Zhao
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/390592
Abstract: By using the matrix decomposition and the reverse order law, we provide some new expressions of the Drazin inverse for any block matrix with rank constraints. 1. Introduction Let be a square complex matrix. The symbols and stand for the rank and the Moore-Penrose inverse of the matrix , respectively. The Drazin inverse of is the unique matrix satisfying where is the index of , the smallest nonnegative integer such that . We write . The Drazin inverse of a square matrix plays an important role in various fields like singular differential equations and singular difference equations, Markov chains, and iterative methods. The problem of finding explicit representations for the Drazin inverse of a complex block matrix, in terms of its blocks was posed by Campbell and Meyer [1, 2] in 1979. Many authors have considered this problem and have provided formulas for under some specific conditions [3–6]. In this paper, under rank constraints, we will present some new representations of which have not been discussed before. 2. Preliminary Lemma 2.1 (see [4]). Let and be square matrices of the same order. If , then where . If and , then . Lemma 2.2 (see [7]). Let where , are square matrices with , . Then where Lemma 2.3 (see [8]). Let , . Then if and only if , satisfy where , and with . Lemma 2.4 (see [9]). Let . Then 3. Main Results In this section, with rank equality constraints, we consider the Drazin inverse of block matrices. Let , where is invertible and is singular. It is easy to verify that can be decomposed as Let where . According to Lemma 2.3, we have the following theorem. Theorem 3.1. Let , where is invertible and is singular. If where , , , then has the following form: Proof. From Lemma 2.3 and (3.1), we know that if where , then Note that Let From Lemma 2.4, we have Note that , . Then we get Let , . Then can be rewritten as the following three matrix products: Since is nonsingular, then Thus, we have From the above equality and the condition (3.3), (3.5) is easily verified. Let , where , . It is easy to verify that the matrix can be decomposed as where is the generalized Schur complement of in . Let where . Then we have the following theorem. Theorem 3.2. If , and the matrices , satisfy then, where , . Proof. From Lemma 2.3 and (3.14), we get that if then Similar to the proof of Theorem 3.1, we derive that the rank condition (3.18) can be simplified as (3.16). Next, we will give the representation for . Let Since , , and , then . From Lemma 2.2, we get From Lemma 2.1 and the fact , it follows that Substituting in (3.19), the conclusion can be obtained.
Several Thoughts on Alienated Labor Theory by Marx
Linlin Jiang
Asian Social Science , 2012, DOI: 10.5539/ass.v8n7p100
Abstract: The alienated labor theory that was proposed by Marx in “Economic & Philosophical Manuscripts of 1844” is the core of Marx’s alienation concept and is also the most component of the theory of Marx. The alienated labor theory of Marx was gradually mature in the process of sublating the traditional alienation concept and its formation and development mainly underwent three phases and finally turned to become a complete theory system.
Measurements of Quarkonium Production and Polarization at CMS
Linlin Zhang
Physics , 2013,
Abstract: The polarizations of Y(nS) (n=1,2,3) and prompt J/\psi and \psi(2S), as well as the differential cross section of the Y(nS), are measured in proton-proton collisions at sqrt(s) = 7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb-1. The differential cross section is measured as a function of transverse momentum of Y(nS). The data show a transition from exponential to power-law behavior in the neighborhood of 20 GeV, and the power-law exponents for all three states are consistent. The polarization parameters \lambda\theta, \lambda\phi, and \lambda\theta\phi, as well as the frame-invariant quantity \lambda, are measured from the dimuon decay angular distributions in three different polarization frames. No evidence of large polarizations is seen in these kinematic regions, which extend much beyond those previously explored.
第1页/共6035条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.