介电常数近零模式与表面等离激元模式耦合实现宽带光吸收

介电常数为零或近零模式在微纳结构中提供了一个新的方式调控光与物质的相互作用.本文首先利用金属圆盘阵列结构激发了表面等离激元共振,在共振频率处实现了光的局域效果;然后通过在金属-绝缘体-金属超表面微纳结构中加入掺杂半导体材料,利用上层金属圆盘阵列激发的表面等离激元共振诱导介电常数近零模式的产生,从而使得介电常数近零模式与表面等离激元模式发生耦合,在中红外波段实现了一个470 nm的宽带吸收效果;数值模拟结果显示,在宽带吸收处存在光场的强局域效果.与窄带吸收相比,宽带吸收有更广泛的应用,比如吸收器、传感器、滤波器、微测辐射热计、光电探测器、相干热发射器、太阳能电池、指纹识别和能量收集装置等.     

Influence of bus stop with left-turn lines between two adjacent signalized intersections

Based on the symmetric two-lane Nagel–Schreckenberg(STNS) model, a three-lane cellular automaton model between two intersections containing a bus stop with left-turning buses is established in which model the occurrences of vehicle accidents are taken into account. The characteristics of traffic flows with different ratios of left-turn lines are discussed via the simulation experiments. The results indicate that the left-turn lines have more negative effects on capacity,accident rate as well as delay if the stop is located close to the intersections, where the negative effect in a near-side stop is more severe than that in a far-side one. The range of appropriate position for a bus stop without the bottleneck effect becomes more and more narrow with the increase of the ratio of left-turn bus lines. When the inflow is small, a short signal cycle and a reasonable offset are beneficial. When the inflow reaches or exceeds the capacity, a longer signal cycle is helpful. But if the stop position is inappropriate, the increase of cycle fails in reducing the negative effect of left-turning buses and the effectiveness of offset is weakened.     

可见光与红外一体化光学系统设计EI北大核心CSCD

空间遥感相机的空间分辨率、时间分辨率以及光谱分辨率不断提高,相机的观测谱段也得到了拓展,实现了多谱段观测.针对多谱段观测需求,通过计算以及光学设计软件设计研究了可见光与红外一体化光学系统.可见光部分系统焦距为6000mm,F数为11.8,波段为400~900nm.红外部分系统焦距为1280mm,F数为2.5,波段为3000~5000nm,两个系统视场均为1.4°×0.6°.可见光波段系统与红外波段系统共用前四片反射镜,五镜为二向分色镜,将可见光反射至五镜上方的时间延迟积分CCD中,红外波段透过五镜至后方校正镜组.整个系统无色差,结构较为紧凑,可见光与红外部分成像质量均达到要求.     

韶关市部分人群微量元素铅含量及其食疗的探讨

为了探讨环境铅污染对成年及未成年人群的影响，在粤北厂矿企业较多的韶关市选取了部分人群的头发样品进行分析，提示环境铅污染在人体造成沉积的规律是少年组大于成年组，女性大于男性；其中女童最易受污染，必须有针对性地加以治疗。     

The mechanism of asymmetric reduction catalyzed by a C_2 symmetric bis-amino alcohol catalyst——In situ NMR study of the structure of new type of dual-centered catalyst

By means of 1H, 13C, 11B NMR, polar transfer DEPT135, DEPT90 and 2D NMR experiments, IR, etc, the structure of the diaminodihydroxyl ligand and its derivatives used in the asymmetric reduction of prochiral ketones were detected. The catalysts derived from the ligand and bo-rane formed in situ were also studied and the structure transformations in solution were monitored.The structure of the catalyst was proved to be a new type of dual-centered catalyst——bis-oxazaborolidine.     

注重概念的建立过程 — — —“ 功率”教学设计

功率的概念对初中生来说相对抽象, 通过文中“ 功率”的教学设计, 试图注重创设生活情境、 探究活动、 问题情境, 让学生在具体情境中一步步建立起描述做功快慢的物理量 — — — 功率, 体现注重概念建立过程的概念教 学理念     

微量元素与艾滋病相关标志物

人类免疫缺陷病毒（HIV）感染病程监督是防治艾滋病的重要措施和手段。阐述了微量元素在HIV病变进程中的变化及与其它相关标志物的关系,内容包括：微量元素与HIV病变、微量元素与CD4淋巴细胞、微量元素与谷胱甘肽、微量元素与HIV消瘦综合征,以及微量元素与炎性反应标志等5个方面。迄今的研究表明,微量元素可以作为反映HIV感染疾病进展的一种新的替代标志物。     

硒与艾滋病

对微量元素硒在艾滋病防治中的作用、意义和可行性作了总结性综述,内容分为5个方面：（1）硒与艾滋病发病;（2）硒与艾滋病发展;（3）硒与艾滋病结局;（4）硒与艾滋病诊断;（5）硒与艾滋病防治。