An algorithm of analysis tools on points distribution in high dimension space: The distance of a point and an infinite sub-space

This paper discusses the algorithm on the distance from a point and an infinite sub-space in high dimensional space With the development of Information Geometry([1]), the analysis tools of points distribution in high dimension space, as a measure of calculability, draw more attention of experts of pattern recognition. By the assistance of these tools, Geometrical properties of sets of samples in high-dimensional structures are studied, under guidance of the established properties and theorems in high-dimensional geometry.

Electron diffraction and photoemission studies of clean and water-covered Si(5,5,12) and Si(112) surfaces

The structure of silicon surfaces in the orientation range (113)-(5,5,12)-(337)-(112) has been investigated using high resolution LEED and photoemission both on a spherical and on flat samples. We find that Si(5,5,12) [5.3 degrees from (113) and 0.7 degrees from (937)] is the only stable orientation between (113) and (111) and confirm the result of Baski et al. [Science 269, 1556 (1995)] that it has a 2 x 1 superstructure with a very large unit cell of 7.68 x 53.5 Angstrom(2). Adsorption measurements of water on Si(5,5,12) yield a mobile precursor kinetics with two kinds of regions saturating at 0.25 and 0.15 ML which are related to adsorption on different sites. Using these results, a modified structure model is proposed. Surfaces between (113) and (5,5,12) separate into facets of these two orientations; between (5,5,12) and (112), they separate into (5,5,12) and (111) facets. (337) facets in this range may be considered as defective (5,5,12) facets.

Triplexers Based on SOI Flattop AWGs

Triplexers are designed based on SOl flattop arrayed waveguide gratings （AWGs）. Three wavelengths （1310, 1490,and 1550nm） operate at three diffraction orders of AWGs. Simulation shows that the 3dB bandwidth,crosstalk, and loss are 6nm,less than -40dB, and 5dB, respectively. The output optical fields of the device fabricated in our laboratory are clear and show a good triplexing function.

利用亮度波形证明固态阴极射线发光

制备了3种结构的器件：A：ITO／SiO2／Alq3／Al，B：ITO／Alq3／SiO2／Al，C：ITO／SiO2／Alq3／SiO2／Al。对于器件A和B，在正向偏压（ITO接正极）下才能观察到发光；而对于器件C，在正向和反向偏压下都可以观察到发光。随着电压升高，器件B和C产生的蓝色发光相对绿光逐渐增强。这主要是由于SiO2中的加速电子碰撞激发Alq3发光层产生热电子，并与空穴形成电子空穴对，复合产生蓝光；而对于器件A，在反向偏压下被热电子碰撞激发出的空穴与正向偏压下从Al电极进入的电子复合形成激子，产生绿色发光。这些结构的器件发光不但可来源于电子与积累的空穴复合，而且也来自固态阴极射线发光。

基于MODIS数据的草地生产力估算研究

草地在广大的干旱、半干旱地区是重要的可更新资源，草地生产力是草地质量评价最重要的指标之一，不仅体现草地生态系统的稳定性及生物种群的多样性，而且在畜牧业的发展及生态建设方面都有极其重要的参考价值和指导意义。本文以内蒙古通辽市科尔沁半干旱草地生态系统为研究对象，通过生长季野外生物量调查，结合遥感植被指数建立该区域三类草地系统的经验估产模型；同时利用遥感植被指数建立的植被光合模型（VPM）模拟草甸草地区域总初级生产力（GPP），为区域畜牧业的发展、生态环境评价及生态恢复提供基础数据。主要结论有： （1）对2000—2006年MODIS的8 d合成归一化植被指数（NDVI）资料和逐日气象资料的分析结果显示：季节变化过程中，研究区水汽压与NDVI的相关程度明显大于降水量；积温和累积降水量共同控制着各年草地的返青速度，草地快速生长期（6、7月）的降水量对NDVI年最大值的影响比年总降水量更显著；时滞分析表明，水汽压对之后约12 d的NDVI有持续的显著影响，平均气温的时滞为11~15 d，降水对NDVI影响的累积和时滞双重效应可达36~52 d。 （2）根据野外生物量调查结果和MODIS数据,分别采用归一化植被指数（NDVI）、增强植被指数（EVI）和修正的土壤调节植被指数（MSAVI）对草甸草地、半退化草地以及沙丘草地三种类型的草地分别建立了生物量估算模型，其拟合优度系数分别为：0.704、0.537、0.723，经F检验其相关性均达到显著水平（P<0.01）。 　　（3）由于引入了草地生长阶段光合生理的季节动态，VPM模拟的总初级生产力（GPPVPM）和涡度相关法观测的总初级生产力（GPPobs）结果有很好的一致性，GPPVPM（1506.54C•m-2）略低于GPPobs（1615.38gC•m-2）。表明VPM可用于半干旱草地总初级生产力的模拟，从而实现对通量观测GPP的尺度扩展，为区域或全球生态系统总或净初级生产力的模拟提供高时间、空间分辨率的准确模拟。

不同长度β_2整合素_M亚基与ICAM-1的亲和性比较

<正>整合素作为细胞表面糖蛋白受体,介导细胞-细胞、细胞-胞外基质以及细胞-病原体间粘附和信息传递,在免疫应答、凝血反应、炎症反应、肿瘤转移和创伤愈合等许多病理生理过程中起重要作用。整合素是由α、β两个亚基非共价结合而成的异源二聚体,其结构类似于两条近平行的腿部支撑着一个球形的头部。研究表明,β_2整合素_M亚基头部的.domain为与配体直接作用的结构域,并可通过"open"或"close"的构象变化