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A shape, rotating cassin's oval body with symmetry deformation parameter of 1.0, in nuclear fission scission point is suggested. By use of the shape, simple calculations on average total kinetic energy of fission fragments in both symmetry and asymmetry cases show that the results are in agreement with semiempirical formula due to V.E. Viola. 相似文献
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ELEMENTARY PARTICLE THEORY GROUP DEPARTMENT OF PHYSICS PEKING UNIVERSITY 《中国物理C(英文版)》1977,1(1):19-36
In this paper,the color symmetry of stratons for a theoretical model proposed some times ago is investigated.This symmetry contains two kinds of transformations, the first is color gauge transformations which leave the color mumber of stratons conserved,the second is color permutations which indicate the equivaluence of dif- ferent color stratons.The structure of this symmetry group(S3α)is investigated.The irreducible representations(IR's)of S3α and the reduction of their direct product are given.The relation between IR's of S3α and those of color U(3)group is discussed. In a simplest physical model only two neutral vector gluons are needed and the super-strong ihteraetions among stratons exhibit saturation properties similar to but somewhat different from the case of the Han-Nambu model.Not only the color singlet, but also other color neutral states belonging to IR's 2 or 1 of S3α all belong to the lowest energy level of the super-strong interactions.If there were eight degenerate vector gluons belonging to IR's 2 and 6,the Han-Nambu model would be reproduced. 相似文献
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本文导出场论中用奇异拉氏量描述的系统正则形式的广义Noether第一定理(GNFT),导出无限连续群下变更性系统正则形式的广义Noether恒等式(GNI),讨论了它们在Dirac约束理论中的应用。给出一个新的反倒,说明Dirac猜想失效,指出某些变更性系统也具有Dirac约束,讨论了GNI在色动力学中的应用。
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将C3对称操作看作角动量表象的对称变换算符,推导出Oh对称性晶场势,这种方法与坐标变换法比较,不必知识谐函数在坐标表象中的具体形式,而有得到完全相符的结果。 相似文献
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这篇文章是介绍一种新的解释帕脱逊图的方法,利用这个方法可以测定无重原子的晶体结构。应用这方法来测定乙二胺四乙酸的晶体结构,我们得到了一个很好的结果。乙二胺四乙酸的晶体属单斜晶系,空间群是C2h6,晶胞参数为a=13.28?;b=5.64?,c=16.14?和β*=83°45′。在(hol)方向投影的平面群为P2。每个单胞中有四个对称中心。 相似文献
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In this paper, we have systematically analyzed the degenerate and nondegenerate two-photon polarization ratios of various point groups. We present the maximum of symmetry assignments of two-photon transition with the combination of degenerate and nondegenerate two-photon absorption. These results provide the theoretical basis for the experimental assignments. 相似文献
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LIU Guo-Xing CHEN Ke-Liang ZHENG Ji-Wen WANG Su-Fang BAI Xing-Ping YU Xian FAN Zhi-Guo 《中国物理C(英文版)》1989,13(8):733-739
The angular distributions of fission fragments for a series of compound nuclei formed in the bombardment of 181Ta,197Au Pb and 209Bi by 12C ions and in the bombardment of natural lead by 14N ions were measu ed with mica track detectors and gold surface barrier detectors.It is shown that all experimental data for the fission fragment angular distributions can be fitted by the statistical scission model of fission fragment angular distribution. 相似文献
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通过实验和计算,分析由于探测器偏置电压的不同所产生的线扩展函数(LSF)变化和随之导致的扫描器调制传递函数(MTF)变化。列举扫描器的视场、相对孔径、扫描速度等因素与探测器性能的匹配关系,提出适当地提高扫描速度是提高Ⅱ类通用组件热像仪空间分辨率、热灵敏度的可选途径。 相似文献
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Mass and kinetic energy distribution of fragments in thermal-neutron in-duced fission of 235U are calculated by a α decay-like model. Besides Coulomb andnuclear interactions, the deformation and intrinsic excitation energies of fragments arealso taken into account. 相似文献
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本文报导了对非晶态铁磁合金F79B15.5S3.5C2样品的11B核磁共振自旋回波的测量结果。所得回波的形状既与射频场强度有关也与射频脉冲宽度有关。从理论上计算了几种条件下的回波波形。实验结果与计算结果基本符合。 相似文献
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采用一个有效的数学模型,分析了在蚀刻工艺中基底自身面形轮廓的曲线形状对基底局部区域的蚀刻速率产生的影响,并通过对数学模型的理论分析和计算机模拟得出受此影响而产生的面形形状,并将结果与实验进行对比.利用这个数学模型对使用离子束蚀刻制作单台阶光栅的台阶与沟槽部分的表面面形随时间的演变过程进行了计算机模拟分析,并通过把理论结果与在实验中得到的蚀刻表面在原子力显微镜(AFM)下拍摄的照片进行比较,结果说明这种模拟分析能够保证对该问题分析所要求的精度,从而也证明了理论模型的合理性和正确性. 相似文献
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焦一鸣 《核聚变与等离子体物理》1994,14(4):9-17
本文利用环形系统的Grad-Shafranov方程得到了D形截面的托卡马克磁面位形,并利用射线追踪技术研究了D形磁面位形下低杂波的运动形态。定性地研究了D形磁面位形下利用低杂波驱动电流的可行性,优化地给出了驱动电流的最佳方式。 相似文献