Isoscalar Giant Resonances of ^120Sn in the Quasiparticle Relativistic Random Phase Approximation

The quasiparticle relativistic random phase approximationmean field ground state in the response function formalism(QRRPA) is formulated based on the relativistic The pairing correlations are taken into accountin the Bardeen-Cooper-Schrieffer approximation with a constant pairing gap. The numerical calculations are performed in the case of various isoscalar giant resonances of nucleus ^120Sn with parameter set NL3. The calculated results show that the QRRPA approach could satisfactorily reproduce the experimental data of the energies of low-lying states.     

Damage and fracture evaluation of granular composite materials by digital image correlation method

This paper presents the applications of digital image correlation technique to the mesoscopic damage and fracture study of some granular based composite materials including steelfiber reinforced concrete, sandstone and crystal-polymer composite. The deformation fields of the composite materials resulted from stress localization were obtained by the correlation computation of the surface images with loading steps and thus the related damage prediction and fracture parameters were evaluated. The correlation searching could be performed either directly based on the gray levels of the digital images or from the wavelet transform (WT) coefficients of the transform spectrum. The latter was developed by the authors and showed higher resolution and sensitivity to the singularity detection. Because the displacement components came from the rough surfaces of the composite materials without any coats of gratings or fringes of optical interferometry, both surface profiles and the deformation fields of the composites were visualized which was helpful to compare each other to analyze the damage of those heterogeneous materials. The project supported by the National Natural Science Foundation of China (10125211 and 10072002), the Scientific Committee of Yunnan Province for the Program of Steel Fiber Reinforced Concrete, and the Institute of Chemical Materials, CAEP at Mianyang     

小朋友学习珠心算

第二节 进位加法 一、20以内的进位加法 两个一位数相加,和等于10或大于10的加法。我们称进位加法。如图所示:     

小朋友学习珠心算

炎一6,4 35 一2,314 一()一()一(》() 7,只2_一6 夕,8一37 一5,6 13 ()()()·() 一6,514 ()()、()() 9,3 68 8,694 6,837 一4,15一4 ()()()() 一4,2 71 ()()一()() 一4,1 23 ()_.()戈)() (二)一盘清 女日: 7,486 请小朋友算题: 一5,2」71 一}一!一}一_{ 二军止 暴 7,一24 98,246 5。948 人一70‘ 一(一)(「)()(.) 位位对齐同位相减(不借) 一7,103 ()()()() 珠算是改珠形式: 布7,456 1,9528,7_92 4,8 96 一l,3 10一6,1一72 ()()()()_()()()() 一2,754 ()()()_() 用一盘清方法计算: 二二 兰二 58一一65--l3一 76--23一93一一 7,3 2 63,6 1 89,…     

物理演示实验开放教学的探讨

介绍了以能力培养为主线的定性与半定量物理演示实验开放式教学模式及其在我校的运作情况。     

端面泵浦掺Yb3+双包层光纤激光器

从双包层光纤激光器的速率方程出发，得到了光纤中泵浦光与激光的功率分布、输出功率与泵浦功率的关系、腔镜反射率及光纤长度对输出功率的影响。研究结果表明：输出激光功率与光纤长度及后腔镜反射率有很强的依赖关系，存在一个输出功率最大的最佳光纤长度。后腔镜反射率越大，输出激光功率越小；当光纤长度较短时，在输出端放置反射镜使泵浦光高反射，可以提高输出功率和效率。通过对端面泵浦掺Yb3+双包层光纤激光器进行理论分析和实验研究，得到输出激光的中心波长为1088.3nm，斜率效率为33.7%，最大输出功率为1.75W。     

小朋友学习珠心算

第三节 珠算基础知识 一、算盘构造图 珠算式心算使用的算盘可以分为两种:第一种是普通珠算盘;第二种是珠心算算盘。它们的构造请看后面的图式。 (一)普通珠算盘构造图     

小朋友学习珠心算

二、加减混合五行加余 （一）原理 加减混合十五行，珠心算技术鉴定与竞赛题，减题占五行。加余中，进66…6，退55…5，总体进11…1。加减混合二十行，珠心算竞赛题，减题占七行。加余中，进88…8，退77…7，总体进11…1。     

偶氮侧基聚合物光致异构动力学研究

本文对偶氮侧基聚合物相位共轭光时间特性进行了研究,得到了相位共扼光产生机制─光致异构过程的时间常数.在相位共轭光上升阶段,其时间常数在0.4～0.5s之间,在相让共轭光的衰减过程,衰减满足双指数关系,分段拟合得到较好的结果,且得到快过程的时间常数为0.27s,慢过程的时间常数为0.78s.