Time history speckle pattern under statistical view

The dynamic speckle analysis has been done because speckle interference began to be evaluated as an important source of information, especially those related to biological samples under laser beam. The time history speckle pattern, a THSP image, is an approach to analyze, which allows a summary to represent the activity monitored. THSP adoption has compelled the research to evaluate the information and the reliability of its inner pattern. This study presents a statistical approach to analyze the data using white noise tests and cross-spectrum analysis. The data analyzed was a set of THSP from animal sperm samples. The evaluation of white noise among lines was conducted using the Fischer test over eight THSP and the cross-spectral approach has been conducted by comparing the information in each THSP. The results presented that the THSP of the sperm did not behave as a white noise in a global evaluation, and specifically in the Gaussian white noise test over 4096 lines; only six lines presented the behavior of a white noise pattern. The strong rejection of white noise test confirms that the THSP pattern allows reliable information. The results obtained with the cross-spectral analysis presented differences between lines within the same THSP, showing that the information of an inner pattern varies in relation to space, which is against the findings in literature.     

ITER��һ��ģ��Be/Cu����ʧЧ����

为了分析ITER第一壁模块试制过程中Be/Cu界面经热等静压扩散连接后出现的不可接受的大尺寸缺陷,对Be/Cu连接失效的模块进行了破坏性试验.首先采用线切割对模块进行解剖,并对连接界面缺陷区域及非缺陷区域通过金相观察、SEM观察及能谱分析进行对比,初步确定了界面连接的失效机理.     

轻奇特核结构中的核心激发--以11Be为例

近年来,越来越多的实验表明,很多轻奇特核结构中都有核心激发成分。本研究以丰中子晕核11Be为例,介绍核心激发成分的实验和理论研究进展,重点阐述核心激发成分对直接核反应微分截面的影响。实验上,1n移除反应及11Be（p,d）和10Be（d,p）转移反应是测量11Be核心激发成分比例的典型实验类型。理论上,发展了能够包括11Be核心激发成分的Faddeev AGS方法,XDWBA方法以及XCDCC方法。加入核心激发成分后,这些模型的计算结果可以更加合理地描述11Be在各种靶上的弹性散射和碎裂微分截面。通过对比是否包含核心激发成分的计算结果,发现其影响主要体现在弹散微分截面的大质心系角度,以及（p,d）转移反应角分布的小质心系角度。另外,对E_x=0:5s3 MeV的激发能区的碎裂反应,核心激发的影响不可忽略;对E_x=3s5:5 MeV的碎裂反应,核心激发的贡献非常重要。It was found that many light exotic nuclei have the core-excitation components. In this paper, taking one-neutron halo nucleus 11Be for example, the experimental and theoretical research progress, as well as the influences on the direct nuclear reaction differential cross sections of this exotic component were reviewed. The 1n removal, 11Be(p, d) and 10Be(d, p) transfer reactions are typical experimental methods to investigate this component. The Faddeev AGS, the XDWBA, and the XCDCC methods are developed to include this constituent in various theoretical models. With the core-excitation component, the calculated results can more reasonably describe the elastic scattering and breakup differential cross sections of 11Be impinging on various targets. Comparing the full XCDCC calculation with that omitting core-excitation effect, we found that this component mainly affects the elastic scattering differential cross sections at large center-of-mass angles, and the (p, d) transfer reaction angular distributions at small center-of-mass angles. In addition, its effect is non-negligible for the breakup reaction within the excitation energy interval of E_x = 0:5~3 MeV, and is remarkable for E_x =3 5:5 MeV.     

Atomic reflection from a magnetic mirror: Beyond the adiabatic approximation

We present theoretical calculations for the reflection of atoms from a magnetic surface with a sinusoidal magnetization. A fully quantum mechanical treatment is possible because the problem may be reduced to an effective one-dimensional one. Results of numerical wave-packet calculations are presented and compared with an analytical model in which the atoms separate into different internal state components which follow classical paths in different potentials. Received 21 October 1999 and Received in final form 18 January 2000     

Thermo-mechanical laser ablation of soft biological tissue: modeling the micro-explosions

Characteristics of thermo-mechanical laser ablation process are investigated using an original numerical model. In contrast with previous models, it is based on a microscopic physical model of the micro-explosion process, which combines thermodynamic behavior of tissue water with elastic response of the solid tissue components. Diffusion of dissipated heat is treated in one dimension, and the amount of thermal damage is assessed using the Arrhenius model of the protein denaturation kinetics. Influence of the pulse fluence and duration on temperature profile development, ablation threshold, and depth of thermal damage is analyzed for the case of Er:YAG laser irradiation of human skin. Influence of mechanical properties on the ablation threshold of soft tissue is predicted theoretically for the first time. In addition, feasibility of deep tissue coagulation with a repetitively pulsed Er:YAG laser is indicated from the model. Received: 9 July 1998 / Revised version: 26 February 1999 / Published online: 26 May 1999     

铍团簇Be_n(n=2-55)的基态能量、结构及其拓扑性质

采用一种第一性原理多体势来描述团簇Ben中原子之间的相互作用,用模拟自然界生物进化的方法系统地优化计算了Ben团簇(n=2-55)的基态能量和几何结构,分析了其拓扑性质,总结了能量和结构随原子数目的变化规律,并将得到的Ben的结果和长程Morse势所描述的金属团簇Mn,以及LennardJones势所描述的惰性气体团簇LJn进行了比较     

ChemInform Abstract: The Novel Binuclear Hydroxyberyllate Species [Be2(OH)7]3- and the Hydroxide Hydrate Anion [H3O2]- as Components of Beryllate Equilibria.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.     

ChemInform Abstract: Ab initio Study of Structure and Stability of LAB3 Hydride and Halide Complex Molecules (L: Li,Na; A: Be,Mg, B+, Al+; and B: F,Cl, H).

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.     

ICP-AES测定多目标水地球化学普查样品中的14种微量元素

采用IRIS Intrepid Ⅱ SXP ICP光谱仪,对地球化学普查水样中Ba、Be、Cd、Co、Cr、Cu、Fe、Mn、Mo、Ni、P、Pb、Sr和Zn等元素的测量条件进行了探讨,优化了实验条件,进行了大批量实际样品的测定.方法简便,快速.检出限、精密度和准确度均符合质量管理的要求.     

ICP-AES测定土壤样品中的Be

本文研究使用HF、HCl、HNO3、HClO4 4种酸溶解样品,ICP-AES测定样品中的Be.对国家一级标样进行测定,测定结果与标准样品值一致,方法检出限Be为0.10μg/g.此方法简便、快速、准确.