Systematic Study of Stability of Super Heavy Nuclei

A systematic overview on the characteristics of super heavy nuclei from Z = 101 to Z = 130 based on the data by P. Moller et al. is presented. The nuclei which have the biggest mean binding energy in each of their isotope chain show systematic regular behavior, indicating that the mean binding energy is a good criterion to classify super heavy nuclei by their stabilities. Further investigation on the nuclear data at and after Z=127 has been suggested.     

图像处理的结构层次建模

图像处理是应用广泛的现代工程技术 ,但直到现在尚无完备的数学模型体系 .依结构层次观点对其数学模型化进行探索 ,给出了图像处理的结构层次模型 ,将图像处理与数学科学中的常见数学理论联系起来 .同时 ,对目前常见图像处理器进行数学模型描述 .     

线有向图的幂敛指数

设G是有向图，LG表示c的线有向图，本文得到了它们的幂敛指数及周期之间的关系：k（G）－1≤（LG）≤k（G）＋1,p（LG）=p（G）特别地，当G为本原图时有：k（LG）＝k（G）＋1     

非欧椭圆几何的若干度量问题

本文用新方法讨论解决了n维椭圆空间Sⁿ中若干几何问题。给出了关于n维球面单形的余弦定理、高的公式、内切及外接球半径r,R以及内心I与外心Q间的距离公式。同时将著名的欧拉不等式推广到Sⁿ中。     

一种基于特征点间线段倾角的姿态测量方法

基于目标特征点间线段倾角信息,提出了一种适合于目标远距离成像和相机内参未知条件下解算目标姿态的目标3维姿态测量方法.采用仿真图像对该方法的正确性进行了验证.实验结果:姿态测量误差绝对值均值小于0.6°,且目标成像尺寸为350pixel时,姿态测量误差绝对值小于0.5°.实验表明该算法具有较高解算准确度和较强的收敛性.     

分光光度法测定注射用复方维生素(3)草酸含量

采用分光光度法测定注射用复方维生素(3)中微量草酸的方法.在氯化钾-盐酸缓冲液下,Fe3+和草酸的络合物能使Fe3+与磺基水杨酸的紫色络合物颜色变浅,测定显色反应后溶液的吸光度,试验中优化了显色反应时间、显色剂用量.结果显示,显色溶液最大吸收波长为503nm,草酸在0.006-0.036mg/mL浓度范围内,其吸光度与浓度呈良好线性关系,y=-17.552x+1.0283,r=0.9991.样品加样回收率为97.6％.本方法能准确检查注射用复方维生素(3)中微量草酸的含量.     

适合于分布式并行计算的一种并行广义乘积型双共轭残差方法(英文)

针对求解大型稀疏非对称线性方程组,提出适合于分布式并行环境的一种并行广义乘积型双共轭残差(GPBiCR)方法(简记为PGPBiCR方法).通过重构GPBiCR方法,新方法将原方法中的三个全局同步点降低到了一个,且内积所需的通讯时间可与向量校正的计算时间有效地重叠.代价仅是稍微增加了一些计算量,而相比于全局通讯时间的降低,这是可以忽略不计的.性能和等效率分析表明,PGPBiCR方法比GPBiCR方法具有更好的并行性和可扩展性,其中可扩展性可改进3倍,而并行通讯性能可改进66.7%.数值试验得到了与理论分析相吻合的结果.     

Effect of entrance-channel asymmetry on the isospin dependence of nucleon emission in heavy ion collisions

Using the isospin- and momentum-dependent hadronic transport model IBUU04, we have investigated the influence of the entrance-channel isospin asymmetry on the sensitivity of the pre-equilibrium neutron/proton ratio to symmetry energy in central heavy-ion collisions induced by high-energy radioactive beams. Our analysis and discussion are based on the dynamical simulations of the three     

Observation of β-Relaxation in Sub-Tg Isothermally Annealed Al-Based Metallic Glasses

Al85Ni5 Y8Ca2 and Al88Ni5 Y6Co2Fe2 metallic glasses are fabricated by melt spinning. A kink or a small exothermic peak is observed for both the samples isothermally annealed at sub-glass transition temperatures. Temperature modulated differential scanning calorimetry （TMDSC） data disapprove amorphous phase separation. The activation energies derived from Kissinger plots of the exothermic process on DSC curve around glass transition temperature are consistent with those of β-relaxation of metallic glasses.     

Remarks on Two-Dimensional Power Correction in Soft Wall Model

We present a direct derivation of the two-point correlation function of the vector current in the soft wall model by using the AdS/CFT dictionary. The resulting correlator is exactly the same as the one previously obtained from dispersion relation with the same spectral function as in this model. The coefficient C₂ of the two-dimensional power correction is found to be C₂=-c/2 with c the slope of the Regge trajectory, rather than C₂=-c/3 derived from the strategy of the first quantized string theory. Taking the slope of the ρ trajectory c≈0.9GeV² as input, we then obtain C₂≈-0.45GeV². The gluon condensate is found to be <α_sG²>≈pprox0.064GeV⁴, which is almost identical to the QCD sum rule estimation. By comparing these two equivalent derivation of the correlator of scalar glueball operator, we demonstrate that the two-dimensional correction cannot be eliminated by including the non-leading solution in the bulk-to-boundary propagator, as carried out by Colangelo et al.[arXiv:0711.4747]. In other words, the two-dimensional correction does exist in the scalar glueball case. Also it is manifest by using the dispersion relation that the minus sign of gluon condensate and violation of the low energy theorem are related to the subtraction scheme.