St/BA/KH-570三元共聚物的合成及其在云母增强聚丙烯中的应用

通过原子转移自由基聚合反应，合成了苯乙烯，丙烯酸丁酯和3－甲基丙烯酰氧基丙基三甲氧基硅烷的三元共聚物，发现该共聚合体系是一“活性”／受控聚合体系，三元共聚物的结构通过红外光变和核磁共振得以确认。研究了该三元共聚物作为大分子偶联剂对云母增强聚丙烯力学性能的影响。发现三元共聚物的组成和分子量对云母增强聚丙烯的力学性能有较大影响。     

Design of a Class of New sp2-sp3Carbons Constructed by Graphite and Diamond Building Blocks

The sp²–sp³-hybridized carbon allotropes with the advantage of two hybrid structures possess rich and fascinating electronic and mechanical properties and they have received long-standing attention.We design a class of versatile sp²–sp³carbons composed of graphite and diamond structural units with variable sizes.This class of sp²–sp³carbons is energetically more favorable than graphite under high pressure,and their mechanical and dynamical stabilities are further confirmed at ambient pressure.The calculations of band structure and mechanical properties indicate that this class of sp²–sp³carbons not only exhibits peculiar electronic characteristics adjusted from semiconducting to metallic nature but also presents excellent mechanical characteristics,such as superhigh hardness and high ductility.These sp²–sp³carbons have desirable properties across a broad range of potential applications.     

互补约束问题的一种新松弛规划及其收敛性

在G.H.Lin与M.Fukushima思想的启发下,针对一般形式的互补约束问题,本文构造了一种新的松弛规划.通过修正和简化G.H.Lin与M.Fukushima的证明方法,在比其更弱的假设条件下获得了该松弛规划的收敛性质.     

拉曼放大辅助波长可选择的全光开关

使用3-dB耦合器组成M-Z干涉仪,在M-Z干涉仪的一臂加入高非线性光纤(HNLF)组成的反向拉曼放大器,改变放大器的泵浦波长及强度,可实现波长可选择的全光开关。其功能可用于波分复用(WDM)系统,对不同波长的上、下载选择有很大的应用意义。理论分析了实现这一功能的可行性和参数选择,考虑拉曼放大并伴有交叉相位调制(XPM)引起信号光的相移,推导分析了在引入放大的同时又引入相移,怎样选择放大和相位匹配问题,来实现波长可选择的光开关的要求。     

辐射免疫学研究进展

近年来辐射免疫学作为一门新兴学科进展迅速，特别是在低剂量辐射兴奋效应研究方面有较大发展，同时重离子辐射生物效应的研究在治疗肿瘤方面也有了明显进步。综述了国内、外辐射免疫学的现况，其目的是寻找出一种综合疗法，从而达到既可以较好的治疗肿瘤，又对病人损伤较小的目的。Radiation immunology as a new subject has made a great progress in recent years, especially in the radiation hormesis. At the same time, the research of radiobiological effect on heavy ions has played an important role in the cancer therapy, especially on the radiation immunology of heavy ions in the outer space. In this review, we summaried the status and development of radiation-immunology, and try to find out some better ways which can increase efficient killing on tumours, but reduce the damages on normal tissues.     

不同形貌羟基磷灰石纳米颗粒的可控合成及其对骨肉瘤细胞生长的影响

制备不同形貌羟基磷灰石纳米颗粒,检测其对骨肉瘤细胞生长的影响.采用化学沉淀的方法,可控制备球形和杆状纳米羟基磷灰石,并通过透射电子显微镜（TEM）、原子力学显微镜、傅立叶变换红外光谱仪（FT-IR）和X-射线衍射仪（XRD）对所制备的颗粒进行表征.通过光镜和投射电子显微镜分析不同形貌羟基磷灰石颗粒对骨肉瘤细胞增殖和形貌的影响.结果表明,球形纳米羟基磷灰石对骨肉瘤细胞的抑制作用更明显.     

辐射诱导促进AdCMV-p53 转染前列腺癌细胞

用腺病毒重组体（AdCMV p53/GFP）转染经0.5, 1.0和2.0 Gy γ射线辐射处理的前列腺癌细胞[PC 3（ nullp53）], 用克隆形成法检测细胞增殖能力, 用流式细胞分析法测定腺病毒重组体转染率和外源性p53蛋白表达。 结果提示, 辐射诱导使腺病毒重组体转染PC 3细胞提高7%—39%。 辐射联合 AdCMV p53 转染组p53表达水平提高18.5%—35.4%。 与单纯 AdCMV p53 转染组和单纯辐射组相比, 辐射联合 AdCMV-p53 转染组细胞存活率分别降低25%—64%和22%—65%。 To determine whether low dose pre irradiation could enhance adenovirus mediated p53 transfer and expression in human prostate adenocarcinoma, the PC 3 cells were pre exposed to γ rays, and then infected with replication deficient adenovirus recombinant vectors, containing human wild type p53 (AdCMV p53) or green fluorescent protein gene (AdCMV GFP) respectively (γ ray irradiation + AdCMV p53 /GFP infection). The exogenous gene transfer and expression were detected by flow cytometric analysis. The GFP transfer frequencies in γ irradiation + AdCMV GFP infection groups were 7%—39% more than those in AdCMV GFP infection groups. The p53 levels in the γ irradiation + AdCMV p53 infection groups were 18.5%—35.4% more than those in AdCMV p53 infection groups (p<0.05),suggesting that low dose (less than or equal to 1.0 Gy) irradiation could significantly promote exogenous p53 transfer and expression in the PC 3 cells. The survival fractions for the γ irradiation + AdCMV p53 infection groups were 25%—64%, 22%—65% less than those for AdCMV p53 infection, or γ irradiation groups, respectively (p<0.05).     

以华人数学家命名的部分研究成果

<正>数学是两千多年来人类智慧的结晶,目前已渗透在现实生活中的各个领域。在中国数学发展的历史长河中,涌现出了许许多多的杰出人物,他们大多都是某些数学领域的奠基人或集大成者,他们的思想和成就体现了各自所处时代的数学活动的主流热点。中国古代算术的许多研究成果里面就早孕育了后来西方数学才涉及的思想方法,近现代也有不少领先的研