空心阴极灯激发的微波等离子体炬原子/离子荧光光谱研究--钙的原子/离子荧光光谱

用强短脉冲供电技术的空心阴极灯作激发源、微波等离子体炬作原子／离子化器，建立了原子／离子荧光光谱实验装置。详细研究了微波等离子体功率、观察高度、空心阴极灯电流等因素对原子／离子荧光信号强度的影响，测量了系统对Ca的原子／离子荧光光谱的检出限。     

Bistable Behaviour of N Two-Level Atoms Interacting with the Field inside a High-Q Cavity Containing a Nonlinear Kerr-Like Medium

Taking the intensity-dependent coupling between atoms and cavity mode into account, we investigate a system consisting of N homogeneously broadened two-level atoms interacting with the field inside a single-mode Fabry- Perot cavity containing a nonlinear Kerr-like medium. We derive the steady-state bistable behaviour of the system, and further analyse in details the influence of several critical parameters on the bistable behaviour.     

(Ni0.81Fe0.19)1-xCrx作为种子层对NiFe/FeMn交换偏置的影响

采用一种新的种子层材料:(Ni081Fe019)1-xCrx,通过改变种子层中Cr原子的含量,使得在其上生长的NiFeFeMn双层膜的织构和晶粒尺寸产生极大的差异,系统研究了NiFeFeMn双层膜中FeMn晶粒尺寸和织构对交换偏置的影响.实验结果表明,在FeMn的γ相(111)织构较好的前提下,交换偏置场的大小与织构的差异没有关系;FeMn的晶粒尺寸对交换偏置场有很大影响,较小的反铁磁层晶粒对交换偏置场有利,过大的反铁磁层晶粒不利于交换偏置场.将(Ni081Fe019)05Cr05与传统的种子层材料Ta进 关键词： 交换偏置 晶粒尺寸 织构 种子层     

激光散斑技术与水工建筑物

散斑干涉计量术是七十年代发展起来的一门新兴技术.当用激光照射物体表面时,其漫反射光相互干涉形成了随机分布的斑点,该斑点称为“散斑”(speckle).散斑在六十年代初兴起的激光全息术中曾被作为相干噪声力求消除掉的.1968年。Burch和Tokavski指出[1]。用全息底片将物体表面的随机分布的散斑与物象一起拍摄下来而得到的散斑图。可用来获得物体表面变形(位移)的信息.Archbold, Burch和Ennos等人于1969年利用激光散斑法研究振动问题[2]。并且在1970年成功地进行物体变形的定量分析[3,4].1974年,Evans和Boone等人利用散斑相关原理测量断裂力…     

60keV质子辐照对TiNi记忆合金薄膜马氏体相变的影响

 利用磁控溅射的方法在氧化后的单晶Si基片上制备了TiNi形状记忆合金薄膜，利用示差扫描量热法和原位X射线衍射研究了薄膜的马氏体相变特征。通过60keV质子注入（辐照）薄膜样品研究了H+离子对合金薄膜马氏体相变特征的影响，结果表明氢离子注入后引起了马氏体相变开始Ms和结束点Mf以及逆马氏体相变开始As和结束温度Af的下降，而对R相变开始Rs和结束温度Rf影响不大。掠入射X射线衍射表明H+离子注入后有氢化物形成。H⁺离子注入形成的氢化物是引起相变点的变化的主要因素。     

PROFILE MINIMIZATION PROBLEM FOR MATRICES AND GRAPHS

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Design of Two-Dimensional Photonic Crystal Edge Emitting Laser for Photonic Integrated Circuits

An edge emitting laser based on two-dimensional photonic crystal slabs is proposed. The device consists of a square lattice microcavity, which is composed of two structures with the same period but different radius of air-holes, and a waveguide. In the cavity, laser resonance in the inner structure benefits from not only the anomalous dispersion characteristic of the first band-edge at the M point in the first Brillouin-zone but also zero photon states in the outer structure. A line defect waveguide is introduced in the outer structure for extracting photons from the inner cavity. Three-dimensional finite-difference time-domain simulations apparently show the in-plane laser output from the waveguide. The microcavity has an effective mode volume of about 3.2（λ/nslab）^3 for oscillation mode and the quality factor of the device including line defect waveguide is estimated to be as high as 1300.     

利用浮区法在高氧压下生长ZnO晶须

采用浮区法在高温高氧压下生长出大尺寸的ZnO晶须. X射线衍射和拉曼光谱分析结果表明, 生长的ZnO晶须结晶良好, 具有六方结构, 沿(001)方向有明显的择优生长取向. 光致发光光谱测量结果表明, 晶须在室温下有较高的紫外光致发光效率和较低的缺陷, 生长时选择大于0.3 MPa的氧压对提高IUV/Igreen有益.     

蛋白质组学中质谱分析前的预富集研究进展

回顾了近年来生物质谱分析鉴定蛋白质及多肽前的预富集方法研究进展,其中包括固相微萃取富集方法、靶上富集方法、电洗脱富集方法以及磷酸化蛋白质/肽段的富集方法,总结和归纳了各种方法所具有的优缺点,引用文献59篇。