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| 1 | Relationship between MODIS-NDVI data and wheat yield: A case study in Northern Buenos Aires province, Argentina显示文摘In countries like Argentina,whose economy depends heavily on crop production,the estimation of harvests is an elementary requirement.Besides providing objectivity,the use of remote sensing allows estimating yield in advance.Since the time of maximum leaf area in wheat corresponds with the critical period of the crop,a good relationship is expected between the Normalized Difference Vegetation Index(NDVI)and yield.The present study was carried out in the North of Buenos Aires province,Argentina.Based on the type of soil,the study area can be divided into two homogeneous subzones:a subzone with lower clay content in the southwestand a subzone with higher clay content in the northeast.Nine growing seasons(2003–2011)were studied.In the first five years,an empirical model was calibrated and validated with field-observed wheat yields and MOD13q1 product-NDVI data,whereas in the other four years,the calibrated model was applied by means of yield maps and by comparing with official yields.The MOD13q1 image corresponding to Julian day 289 showed the best fit between NDVI and yield to estimate wheat yield early.Through yield maps,better weather conditions showedhigher yields and higher soil productivity presented a greater proportion of the area occupied by higher yields.At department level,an R2 value of 0.75 was found after relating the estimation of the calibrated empirical model with official yields.The method used allows predicting wheat yield 30 days before harvest.Through yield maps,the NDVI perceived the temporal and spatial variability in the study area. | Mariano F.Lopresti Carlos M.Di Bella Américo J.Degioanni | 2015 | Information Processing in Agriculture2015，2，2： | 8 |
| 2 | 拓扑绝缘体二维纳米结构与器件显示文摘拓扑绝缘体是一种全新的量子功能材料,具有绝缘性体能带结构和受时间反演对称性保护的自旋分辨的金属表面态,属于Dirac粒子系统,将在新原理纳电子器件、自旋器件、量子计算、表面催化和清洁能源等方面有广泛的应用前景.理论和实验相继证实Sb2Te3,Bi2Se3和Bi2Te3单晶具有较大的体能隙和单一Dirac锥表面态,已经迅速成为了拓扑绝缘体研究中的热点材料.然而,利用传统的高温烧结法所制成的拓扑绝缘体单晶块体样品常存在大量本征缺陷并被严重掺杂,拓扑表面态的新奇性质很容易被体载流子掩盖.拓扑绝缘体二维纳米结构具有超高比表面积和能带结构的可调控性,能显著降低体态载流子的比例和凸显拓扑表面态,并易于制备高结晶质量的单晶样品,各种低维异质结构以及平面器件.近年来,我们一直致力于发展拓扑绝缘体二维纳米结构的控制生长方法和物性研究.我们发展了拓扑绝缘体二维纳米结构的范德华外延方法,实现了高质量大比表面积的拓扑绝缘体二维纳米结构的可控制备,并实现了定点与定向的表面生长.开展拓扑绝缘体二维纳米结构的谱学研究,利用角分辨光电子能谱直接观察到拓扑绝缘体狄拉克锥形的表面电子能带结构,发现了拉曼强度与位移随层数的依赖关系.设计并构建拓扑绝缘体纳米结构器件,系统研究其新奇物性,观测到拓扑绝缘体Bi2Se3表面态的Aharonov-Bohm(AB)量子干涉效应等新奇量子现象,通过栅电压实现了拓扑绝缘体纳米薄片化学势的调控,并将拓扑绝缘体纳米结构应用于柔性透明导电薄膜.本文首先简单介绍拓扑绝缘体的发展现状,然后系统介绍我们开展的拓扑绝缘体二维纳米结构的范德华外延生长、谱学、电学输运特性以及透明柔性导电薄膜应用的研究,最后对该领域所面临的机遇和挑战进行简要的展望. | 李辉 彭海琳 刘忠范 | 2012 | 物理化学学报2012，28，10： | 5 |
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