多源遥感影像时空信息融合产生的高时空分辨率影像是遥感地学应用的重要数据源,利用时空融合算法形成的高时空分辨率植被指数数据集对于植被动态监测具有重要意义。为了在草原植被监测中更好地应用时空融合算法,该文利用2013-2016年间...多源遥感影像时空信息融合产生的高时空分辨率影像是遥感地学应用的重要数据源,利用时空融合算法形成的高时空分辨率植被指数数据集对于植被动态监测具有重要意义。为了在草原植被监测中更好地应用时空融合算法,该文利用2013-2016年间内蒙古自治区呼伦贝尔和锡林郭勒地区多期Landsat8和MODIS影像进行高时空分辨率NDVI植被指数计算,定量评价了STARFM(Spatial and Temporal Adaptive Reflectance Fusion Model)、CDSTARFM(Combination of Downscaling Mixed Pixel Algorithm and Spatial and Temporal Adaptive Reflectance Fusion Model)和STDFM(Spatial and Temporal Data Fusion Model)3种常用时空融合算法在不同融合策略下的精度。研究结果表明,基于NDVI融合策略的STARFM算法更适合草原地区高时空分辨率NDVI数据的构建。展开更多
本文回顾了语言学习动机研究的历史和发展,介绍了最新的CDST(Compl ex Dynami cs Syst em Theor y)复杂动态系统理论在这一领域的运用,并指出用复杂动态系统理论指导动机研究虽然能更逼近动机的复杂实际,但在研究的具体操作层面有很多困...本文回顾了语言学习动机研究的历史和发展,介绍了最新的CDST(Compl ex Dynami cs Syst em Theor y)复杂动态系统理论在这一领域的运用,并指出用复杂动态系统理论指导动机研究虽然能更逼近动机的复杂实际,但在研究的具体操作层面有很多困难,研究成果对实际的教学指导意义也比较局限。展开更多
This study employs a Q methodology to explore the developmental routines of oral English ability for 12 English major students in China inspired by Complex and Dynamic Systems Theory(CDST).The data analysis suggests t...This study employs a Q methodology to explore the developmental routines of oral English ability for 12 English major students in China inspired by Complex and Dynamic Systems Theory(CDST).The data analysis suggests the next findings:(1)two developmental patterns emerge as the gradual improvement and the strong phase shift influenced by internal and external factors for interactions among different subsystems;(2)guided by CDST,the study proves the importance of self-organization and initial condition in previous studies.According to the above findings,It is highly suggested for teachers to form a holistic view of students’oral English development concerning the non-linear characteristic and individual differences.展开更多
OBJECTIVE:To observe the effects of Compound Danshen Tablets(CDST) on spatial cognition and expression of brain b-amyloid precursor protein(β-APP) in a rat model of Alzheimer's disease.METHODS:The rat model of Al...OBJECTIVE:To observe the effects of Compound Danshen Tablets(CDST) on spatial cognition and expression of brain b-amyloid precursor protein(β-APP) in a rat model of Alzheimer's disease.METHODS:The rat model of Alzheimer's disease(AD) was established using D-galactose to cause subacute aging combined with Meynert nucleus damage.Rat behavior was monitored using the Morris water maze,and the expression of β-APP in rat brain tissue was detected via immunohistochemistry.RESULTS:CDST significantly improved spatial cognition and decreased β-APP expression in the cortex and hippocampus(P<0.05,P<0.01).CONCLUSIONS:CDST can significantly improve spatial cognition in a rat model of AD.This observation is possibly related to a reduction in β-APP ex-pression in the rat brain.展开更多
文摘多源遥感影像时空信息融合产生的高时空分辨率影像是遥感地学应用的重要数据源,利用时空融合算法形成的高时空分辨率植被指数数据集对于植被动态监测具有重要意义。为了在草原植被监测中更好地应用时空融合算法,该文利用2013-2016年间内蒙古自治区呼伦贝尔和锡林郭勒地区多期Landsat8和MODIS影像进行高时空分辨率NDVI植被指数计算,定量评价了STARFM(Spatial and Temporal Adaptive Reflectance Fusion Model)、CDSTARFM(Combination of Downscaling Mixed Pixel Algorithm and Spatial and Temporal Adaptive Reflectance Fusion Model)和STDFM(Spatial and Temporal Data Fusion Model)3种常用时空融合算法在不同融合策略下的精度。研究结果表明,基于NDVI融合策略的STARFM算法更适合草原地区高时空分辨率NDVI数据的构建。
文摘本文回顾了语言学习动机研究的历史和发展,介绍了最新的CDST(Compl ex Dynami cs Syst em Theor y)复杂动态系统理论在这一领域的运用,并指出用复杂动态系统理论指导动机研究虽然能更逼近动机的复杂实际,但在研究的具体操作层面有很多困难,研究成果对实际的教学指导意义也比较局限。
文摘This study employs a Q methodology to explore the developmental routines of oral English ability for 12 English major students in China inspired by Complex and Dynamic Systems Theory(CDST).The data analysis suggests the next findings:(1)two developmental patterns emerge as the gradual improvement and the strong phase shift influenced by internal and external factors for interactions among different subsystems;(2)guided by CDST,the study proves the importance of self-organization and initial condition in previous studies.According to the above findings,It is highly suggested for teachers to form a holistic view of students’oral English development concerning the non-linear characteristic and individual differences.
基金Supported by the National Science and Technology "12th Five-years" Major Special-purpose Foundation (No 2011ZX09201-201-01)
文摘OBJECTIVE:To observe the effects of Compound Danshen Tablets(CDST) on spatial cognition and expression of brain b-amyloid precursor protein(β-APP) in a rat model of Alzheimer's disease.METHODS:The rat model of Alzheimer's disease(AD) was established using D-galactose to cause subacute aging combined with Meynert nucleus damage.Rat behavior was monitored using the Morris water maze,and the expression of β-APP in rat brain tissue was detected via immunohistochemistry.RESULTS:CDST significantly improved spatial cognition and decreased β-APP expression in the cortex and hippocampus(P<0.05,P<0.01).CONCLUSIONS:CDST can significantly improve spatial cognition in a rat model of AD.This observation is possibly related to a reduction in β-APP ex-pression in the rat brain.
