“神光”Ⅱ黑腔物理分解实验

本项目主要关注金腔靶内辐射烧蚀等离子体运动对辐射场特性及其诊断产生的影响和抑制方法。黑腔诊断口附近金等离子体喷射容易造成堵口现象，对X光发射能谱特性和角分布测量产生不利影响。腔内金等离子体向心运动还会使入射激光光路偏折，从而改变着靶点位置和能量沉积区域，影响腔内辐射场分布。为便于实验诊断分析，采用半腔靶和静态充气腔靶两种分解靶型进行研究，分别对应以下研究内容：了解金腔靶诊断口附近等离子体喷射对X光诊断的影响和抑制方法；利用填充气体抑制腔壁金等离子体喷射，证实静态充气黑腔靶实验的技术可行性。     

怀念核物理学家虞福春教授

回顾了虞福春教授一生的业绩，他是一位杰出的实验物理学家，1950年，他最早发现核磁共振谱线的化学位移，为核磁共振技术在化学领域的应用打开了大门，他测定了许多原子核的自旋和磁矩，为检验核壳结构模型作出了重要贡献，他又是一位优秀的教育家，培养了一大批物理人才，他的教学思想已经影响了几代学生。     

纳米流体介质导热机理初探

纳米流体导热行为具有许多奇异的特性，结合纳米流体的特点和微尺度传热学原理，研究了 热流在纳米颗粒内波动式及非限域的热传导特性、纳米颗粒在悬浮液内的布朗运动、颗粒- 液体界面上液膜层原子的有规则排列、以及纳米颗粒的团簇形成及移动等四方面因素对纳米 流体导热系数的影响. 关键词： 纳米流体 导热     

Structural Evolution of Nanostructured γ—Ni—28Fe Alloy Investigated by Using the Internal Friction Technique

The structural evolution of nanostructured γ-Ni-28Fe alloy(n-Ni-Fe)(grain size d-30nm),synthesized by the mechno-chemical method,was investigated by using the internal friction technique combined with differential scanning calorimetry(DSC) in the temperature range from 300K to 670K.An internal friction peak with typical characteristics of the first-order phase transition was observed in the vicinity of 620K,which corresponds to a broad exothermic process revealed by using DSC.Theses results can be explained as the structural changes from the disordering to the ordering transition in the n-Ni-Fe sample.     

磁性钴纳米晶的二维自组装

在两种表面活性剂存在下，采用高温醇还原，合成出单分散、平均颗粒尺寸为14±19nm，直径标准偏差小(～18%)的磁性金属Co纳米晶.利用x射线衍射、紫外吸收光谱、x射线光电子能谱及透射电子显微镜对其结构和表面价态进行了分析.并将磁性金属Co纳米晶自组织形成有序的二维(2D)六方紧密堆积结构. 关键词： Co纳米晶 单分散 自组装     

Photoluminescence Characterization of Silicon Nanoparticles Hybridized Europium Complex

A europium complex Eu (DBM)3 TPPO (Eu tris(benzoylmethide)-(triphenylphosphine oxide)) and silicon nanoparticles have been hybridized.The hybridization can evidently change the photoluminescence (PL) characteristics of the Eu complex in the following aspects:under an excitation of 390nm,the intensity of the PL peak at 611nm due to the ^5Du-^7F2 transition of the Eu^3 ions has been increased by 30%,and thc integrated PL intensity in the visible range has been increased by nearly 3 times;the PL excitation efficiency beyond 440nm has been improved cvidently;the peak in the PL excitation spectrum shifts from 408nm to 388nm,and the PL decay time decreases from 2.07 to 0.96μs,The experimental results indicatde that in the PL process,the photoexcited energy may transfer from the silicon nanoparticlcs to the Eu^3 ions.     

Fluorescence Microscopy of Nanoscale Silver Oxide Thin Films

The experimental conditions for photoactivated intermittent fluorescence from nanoscale silver oxide were studied with fluorescence microscopy.Strong fluorescence was observed from the Ag2O particles with size of 10-20nm excited with both blue and green light .We observed the saturation of Photoexcitation with blue light and explained the experimental results using the model of agglomeration of silver atoms to form small clusters and the fluorescence of Ag2 and Ag3 clusters.     

Mg,Si和S同位素链的壳反常

采用考虑轴向形变的相对论平均场理论,以双中子、双质子分离能隙δ_2n/δ_2p作为壳封闭的特征,分析了Mg,Si和S同位素链的壳封闭和壳反常,发现Mg同位素链在N=12,16处,Si同位素链在N=14,S同位素链在N?=16处出现明显的壳封闭结构,Si同位素链在N=28处壳层结构并没有消失.Mg,Si和S同位素链在N=20处壳效应并不太明显.