ECFA之后的两岸政治关系走向

在两岸政治互信和良性互动逐渐增强、两岸全面交流局面形成、两岸顺利签署ECFA的大背景下,两岸关系和平发展如何向深度和广度推进,特别是如何发展两岸政治关系?成为两岸有识之士普遍关注的话题。两岸著名专家学者发表看法

Isolation and Characterization of an Electricity-producing Strain Shewanella sp. S2 from Marine

通讯作者：[email protected][中文文摘]以厦门白城海域的潮间带表面沉积物为菌种来源筛选得到一株具有电催化活性的菌株S2,该菌株的16S rRNA和gyrB基因发育树与Shewanella oneidensis MR-1同支,相似性分别为98.5%和87%,葡萄糖、木糖、半乳糖等碳源利用及最佳生长的NaCl浓度与S.oneidensis MR-1有显著差别,因此初步鉴定为Shewanella属菌株,命名为Shewanella sp.S2。初步研究了菌株S2产电活性,在以乳酸作为碳源产电时,电压最高为150mV,相应的电流密度为66.1mA/m2。 [英文文摘]A new electrochemically active bacterium (exoelectrogen), strain S2, was isolated from coastal marine sediments of Xiamen. The phylogenetic trees based on 16S rRNA and gyrB gene sequences showed that strain S2 formed a lineage within the genus Shewanella and had high similarity (98.5% and 87.0%, respectively) with strain S. oneidensis MR-1. The phenotypic characteristics indicated strain S2 could be distinguished easily from S. oneidensis MR-1 by its culture conditions such as pH, NaCl tolerance and carbon source utilization. Based on these results, it is identified as Shewanella sp. S2. The preliminary current generation experiments showed that S2 could use lactate and xylose for electricity production. When lactate was used as a fuel, the MFC had highest voltage (150 mV) and current density (66.1 mA/m2).中国大洋协会项目(No.DYXM-115-02-2-15

DISTRIBUTION FEATURES OF SURFACE Chlorophyll a IN TAIWAN STRAIT IN AUGUST, 1998

根据1998年8月台湾海峡表层温度、盐度、叶绿素a的走航式观测结果 ,讨论了调查期间叶绿素a的分布特征。结果表明 ,夏季台湾海峡存在明显的上升流现象 ,表层较高的叶绿素a含量均位于低水温区。表层叶绿素a最大值出现在上升流区的边缘。作者认为这是上升流中心区与边缘区浮游植物的大量繁殖具有一定的“时间差”的缘故。台湾海峡24°N以南及以北海域 ,由于上升流强度的差异 ,表层叶绿素a的分布变化也明显不同。夏季 ,台湾海峡表层叶绿素a含量呈南高北低的趋势。Distribution features of surface chlorophyll a were discussed according to the underway measurements of chlorophyll a conducted in the Taiwan Strait in August, 1998. The results showed that the high chlorophyll a values were situated upwelling area, and the chlorophyll a maximum were situated upwelling edge, because the difference of time began an intensive growth period of phytoplankton between upwelling zone and upwelling edge. The chlorophyll a values in the southern part of Taiwan Strait was higher than that in the northern part due to strong upwelling in the southern part of Taiwan Strait.国家自然科学基金重点资助项目49636220号 ;; 福建省科技资助项目98 Z 179

VERTICAL DISTRIBUTION FEATURES OF TEMPERATURE AND CHLOROPHYLL a IN TAIWAN STRAIT IN AUGUST, 1998

根据１９９８年８月台湾海峡温度、盐度、叶绿素a的观测结果，讨论了调查期间叶绿素 ａ的垂直分布特征。结果表明，夏季台湾海峡西部海城存在明显的上升流，较高的叶绿素ａ含 量均位于低温高盐的涌升水中。叶绿素ａ最大值出现在上升流区边缘、温跃层附近。台湾海峡 东部海域由高温、低盐、低营养盐水占据，叶绿素ａ含量明显较海峡西部海域低。： Vertical distribution features of chlorophyll a were discussed according to the CTD data obtained in the Taiwan Strait in August, 1998. The results showed that the high chlorophyll a values were situated upwelling water in the western part of Taiwan Strait. The chlorophyll a maximum were near the thermocline of upwelling in Taiwan Strait. The chlorophyll a values in the western part of Taiwan Strait was higher than that in the eastern part due to strong upwelling in the western part of Taiwan Strait.国家自然科学基金重点资助项目49636220号;; 福建省科技项目98－Z－179号

大面积闪烁光纤阵列探测器的在束测试

利用70 AMeV26Mg初级束流及其产生的次级束流,在兰州重离子加速器放射性次级束流线(RIBLL)终端测试了大面积闪烁光纤阵列探测器(LASFA)探测单元的时间分辨和位置分辨能力。利用70 AMeV26Mg初级束流测试得到的时间分辨约为128 ps,对应的位置分辨约为10 mm;利用次级束流测试得到的时间分辨约为158 ps,对应的位置分辨约为13 mm,具有很好的时间分辨和空间角分辨能力。结合RIBLL的ΔESi探测器,给出了ΔESi-TOF二维谱,并将测试结果与RIBLL的粒子鉴别系统进行详细比较。结果表明,大面积闪烁光纤阵列作为轻带电粒子的飞行时间终止探测器,性能优于RIBLL上采用的时间拾取探测器,可更清楚地鉴别次级束流

兰州放射性束流线上速度选择器的设计制造及初步调试

描述了一台在兰州放射性次级束流线(RIBLL)前端安装的速度选择器系统,该系统由2个三组合四极透镜组和1个正交的电磁场组成,将用于熔合蒸发余核的研究．介绍了该设备的设计思路、基本参数和本底抑制能力、传输效率、角度接收度以及动量接收度的测量结果．结果表明该系统达到设计要求,进行适当改造后可用于Z≤110的超重核素的研究和中重核区滴线核的研究

Production of Diamond Nanospherulite at Carbon-Water Interface by Laser Ablation and Its Characterization by TEM

联系人：郑兰荪 第一作者王育煌，男23岁，硕士研究生。Carbon nanoparticle appearing in perfect spherical shape, with sizes varying from tens nanometers to several micrometers, can be produced by pulsed-laser ablating different elementary carbon samples immersed in water. A variety of samples including HOPG,graphite, arcdischarging deposite, glassy-carbon and imitation-diamond have been tried.The yield of the diamand nanospherulite is found to depend on the structure of the sample.The SAED pattern of the carbon-sphere produced from arc-discharging deposite can be attributed to the hexagonl structure of diamond,and its HREM image exihibits 0.38nm× 0.31nm lattice,which is just three times 0f the distances for (110)(d=0.126nm)and (004)(d=0.1030nm)crystal layers of hexagonal diamond,respectively.While the SAED pattern from glassy-carbon sample displays a cubic-diamond structure.Furthermore ,Raman spectra and 13CNMR indicate tetrahedral network of the spheres.国家杰出青年科学基金;国家教育委员会“跨世纪人才计划”基

一台用于IMP重离子治癌线上的电离室

介绍一种用于中国科学院近代物理研究所(IMP)重离子肿瘤治疗线上、于纵向场常压下工作的气体电离室,其灵敏面积为250mm×250mm,极间距离为10mm,电离室工作气体为P10,在85kPa下流气式工作。用75MeV/u12C离子入射,测量了电离室的坪曲线。发现电离室工作坪区900—3000V,12C的Bragg峰位于13.73mm,峰的极大值半高宽(FWHM)为0.19mm

RIBLL传输效率研究

利用实验测量和Monte Carlo模拟的方法,研究了RIBLL的传输效率。分析了影响传输效率的主要因素,发现碎片的动量分布形式对传输效率的模拟结果有重要的影响。另外通过比较,发现大部分碎片传输效率的模拟结果稍大于实验测量结果,两者最大相差约几十倍,这可以帮助估算次级束流强度,指导实验设计