997 resultados para 193-1188A


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无论是放射性核素内照射还是不同射线外照射,无论是辐照体外培养细胞还是活体照射,都存在一定的辐射旁效应。旁效应的研究方法很多,如低剂量常规辐照,未照射细胞与照射细胞共同培养,用辐照细胞条件培养基处理未辐照细胞,微束单细胞定点辐照等。本文就辐射旁效应的研究方法做一综述。

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根据光学等倾干涉的原理,设计了一种新的测量金属线胀系数的装置与方法.自行设计了测量金属线胀系数的多光束干涉装置.利用多光束干涉产生的同心圆环的吞吐量精确测量了黄铜的线胀系数,相对误差为0.07%.并分析了多光束干涉法测金属线胀系数的优点.

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先用120 keV的碳离子注入非晶二氧化硅a:SiO2薄膜,再用能量为1 754 MeV的Xe离子辐照。注碳量为5.0×1016—8.6×1017ion/cm2,Xe离子辐照剂量为1.0×1011和5.0×1011ion/cm2。辐照后的样品中形成的新结构用显微傅立叶变换红外光谱仪进行测试分析。结果表明,Xe离子辐照引起了注碳a:SiO2中Si—C,C—C,Si—O—C键以及CO和CO2分子的形成与演化。在注碳量较高时,Xe离子辐照在样品中产生了大量的Si—C键。与注入未辐照和辐照的低注碳量样品比较,增强的Si—C键的形成,预示着辐照可引起注碳a:SiO2样品中的SiC结构相变。

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介绍了一种T型桥全通域网络的频率特性和计算结果。将这种具有频率带通特性的全通域网络运用于同步加速器高频腔体,就形成了一种新型同步加速器无调谐高频腔体。这种新型高频腔体具有比同步加速器常规高频腔体相对优越的性能。

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着重报告了自行研制的轴向对称型BGO反康屏蔽探测器的基本结构、抑制原理及其抑制性能的测试结果。测得60Coγ射线源的康普顿抑制系数在能区100~300、300~800、800~1100keV范围内分别为2.3、4.1和4.6,且峰总比为37%(对相对效率为30%的HPGe探测器)。

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The LPT (Lanzhou Penning Trap) is under construction and its task is to perforin direct mass measurement of fusion-evaporation residue, and if possible for heavy isotopes. Detailed simulations have been clone for a good understanding to the ion's movement and mechanics in the trap. The optimizal ion of the LPT is also performed based on the simulation. With a scale of 0.5 mm per grid used in the, simulation and many other limitations a highest mass resolution has been achieved to be 1.9 x 10(-5). An unexpected behavioin in the simulation related to magnetron motion has been found.

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The main ion beams acceleration facilities and research fields of the Institute of Modern Physics (IMP) are briefly introduced. Some of the experimental instruments, typical works and the obtained results on the materials research with swift heavy ions at the IMP-accelerators are presented.

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推行公务卡改革,对事业单位在减少现金使用量、增加支出透明度、预防腐败等方面会产生积极影响,对单位财务成本、财务风险等方面会产生不利影响。通过公务卡改革制度建设和创新,加强银行等金融系统信息化平台建设,扩大公务卡的应用范围,保证公务卡结算方式的畅通执行,从而提高财政财务透明度、加强财政管理监督、打造"阳光财政"。

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本文阐述辽河下游地区 1∶5 0万SOTER建立中SOTER图编制与数据采集的过程及有关问题 .