脑血管疾病患者头发微量元素含量检测分析

研究了脑血管疾病患者头发微量元素与疾病发生的关系。采用电感耦合高频等离子体发射光谱法定量测定脑血管疾病男性患者头发中铁、铜、钙、锰、钴、镍、锶、镁八种微量元素含量,并与健康成年男性相比,差异有显著性;女性患者头发中锌、钙、镍、钼、锶、鳄、钛七种微量元素含量与健康成年女性相比,差异有显著性。提示微量元素对维持血管正常结构、保持血管完整性、抗凝及对抗自由基有重要作用。     

基于光子晶体塔姆态的带隙分裂

将由两个一维介质层光子晶体组成的异质结拓展为超晶格结构,分析了该结构的能带和透射谱。该超晶格结构可以产生多个界面隧穿态,它们之间的耦合可产生新的通带。研究结果表明,该通带的宽度随光子晶体的周期数变化,而通带的中心位置保持不变。当光子晶体周期数取特定值时,这个通带将发生分裂,在带间产生零相位带隙或π相位带隙。     

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。     

1985nm激光加热下水滴蒸发实验研究

设计了激光加热液滴蒸发的实验装置,使用石英丝对液滴进行悬挂,采用1985 nm波长激光器对液滴进行加热,利用显微摄像头和红外热像仪对蒸发过程进行监测,通过分析软件得到液滴直径、表面温度分布等相关参数。实验结果表明,激光加热下液滴蒸发过程包括预热段和主蒸发段,预热段液滴尺寸变化不明显,主蒸发曲线同d~2定律相差较大。整个蒸发过程中液滴温度呈现明显的不均匀性,并从液滴预热段温度变化上发现明显的液滴内部流动现象。此外,随着功率增大,蒸发速率也随之增大,液滴蒸发时间缩短,液滴的最高温度升高。     

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.     

C_2对称二氨基二醇硼烷的不对称还原机理──I.新型双活性中心催化剂结构的 in situ NMR研究

采用~１Ｈ,~１３Ｃ ＮＭＲ,~１１Ｂ ＮＭＲ极化转移实验ＤＥＰＴ１３５,ＤＥＰＴ９０和二维ＮＭＲ实 验以及ＩＲ等技术,对用于潜手性酮类不对称硼烷还原的二氨基二醇配体及其衍生物进 行了鉴定,并对其与硼烷原位形成的催化剂结构进行了 ｉｎ ｓｉｔｕ ＮＭＲ研究,发现了催化 剂在反应溶液中的结构转化现象,确定了催化剂的结构为新型的双活性中心催化剂 ──双噁唑硼烷．     

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     

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.     

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。