Isoscaling of the Fission Fragments with Langevin Equation

The Langevin equation is used to simulate the fission process of ^112Sn ^112Sn and ^116Sn ^116Sn. The mass distribution of the fission fragments are given by assuming the process of symmetric fission or asymmetric fission with the Gaussian probability sampling. The isoscaling behaviour has been observed from the analysis of fission fragments of both the reactions, and the isoscaling parameter α seems to be sensitive to the width of fission probability and the beam energy.     

Δ—scaling and Information Entropy in Ultra—Relativistic Nucleus—Nucleus Collisions

The Δ-scaling method has been applied to ultra-relativistic p p,C C and Pb Pb collision data simulated using a high-energy Monte Carlo package,LUCIAE 3.0.The Δ-scaling is found to be valid for some physical variables,such as charged particle multiplicity,strange particle multiplicity and number of binary nucleon-nucleon-nucleon collisions from these simulated nucleus-nucleus collisions over an extended energy ranging from E1ab=20 to 200A GeV.In addition we derive the information entropy from the multiplicity distribution as a function of beam energy for these collisions.     

离子液体在纤维素研究中的应用

离子液体是一种新型的绿色溶剂,纤维素是一种可再生的生物资源,作为非衍生化纤维素溶剂,离子液体在纤维素研究中呈现出了良好的发展态势。本文综述了纤维素在离子液体溶解、再生、衍生化反应及其在生物酶催化等方面的一些研究成果。     

Investigation of Exotic Structure of the Largely Deformed Nucleus ^23A1 in the Relativistic-Mean-Field Model

A candidate for proton halo nucleus ^23A1 is investigated based on the constrained calculations in the framework of the de[ormed relativistic mean tield (RMF) model with the NL075 parameter set. It is shown by the constrained calculations that the ground state of ^23A1 has a large deformation that corresponds to the prolate shape. With that large deformation, the non-constrained RMF calculation predicts that there appears an inversion between the 2s1/2 [211] and ld5/2 [202] shells. The valence proton of ^23A] is weakly bound and occupies 2s1/2 [211] and ld5/2 [202] with the weights of 56% and 29%, respectively. The calculated RMS radius for matter is in agreement with the experimental one. It is also predicted that the difference between the proton RMS radius and the neutron one is very large, This suggests that there exists a proton hMo in ^23Al.     

镜像核13N-13C 和15N-15O中的激发态晕或皮(英文)

用非线性相对论平均场对两对镜像核13N-13C 和15N-15O进行了研究. 发现无论在基态还是激发态， 用两套参数所得的结合能都跟实验值很接近. 计算结果显示13N的第一激发态（2s1/2）和第三激发态（1d5/2）各存在一个非束缚的质子晕， 而13C的第三激发态（1d5/2）存在一个弱束缚的中子皮. 另外研究表明, 在另一对镜像核15N-15O的第二激发态（2s1/2）和第一激发态（2s1/2）分别存在一个中子晕和质子皮. Properties of two pairs of mirror nuclei 13N-13C and15N-15O are investigated by using the nonlinear relativistic mean field theory. It is found that all the calculated binding energies with two different parameter sets are very close to the experimental ones for both the ground states and the excited states. The calculations show that the first excited state (2s1/2) and the third excited state (1d5/2) in 13N are both unbound resonances with proton halo structure, whereas the third excited state (1d5/2) in 13C is weakly bound with a neutron skin. It is also predicted that there has a proton halo in the second excited state (2s1/2) of 15N as well as a neutron skin in the first excited state (2s1/2) of 15O.     

丰中子核反应的HBT效应研究

用同位旋相关的量子分子动力学模型模拟了丰中子弹核引起(Be同位素)的核反应的中子-质子动量关联函数(即HBT), 我们发现在小相对动量的中子-质子的HBT敏感于弹核的结合能, 同时质子--晕中子的HBT依赖于核的单中子分离能. 我们还研究了核态方程和介质中核子--核子截面的对HBT的影响.     

A New Possible Probe for Investigating the Exotic Structure of Neutron-Rich Nuclei by Using the Hanbury-Brown-Twiss Method

Hanbury-Brown-Twiss (HBT) results of the nucleon-nucleon correlation function have been presented for the nuclear reactions with neutron-rich projectiles using an event-generator, i.e. the isospin-dependent quantum molecular dynamics model. A good agreement of our calculation for the two-halo-neutron correlation function of     

二价铜离子对人胰岛淀粉样蛋白(hIAPP)(11～28)多肽聚集的影响

人胰岛淀粉样蛋白(hIAPP)与Ⅱ型糖尿病(T2DM)密切相关,被认为是导致胰岛β细胞凋亡的致病因素之一,研究发现环境因素(如金属离子、pH值和温度等)对hIAPP的聚集过程有很大影响。本文采用多种生物物理的实验方法,研究了二价铜离子对hIAPP及其片段聚集的影响。原子力显微镜(AFM)和硫代黄素T(ThT)荧光的测量表明,铜离子能够明显地抑制hIAPP(11~28)聚集成纤维,其抑制程度随铜离子浓度的增加而明显加剧。显微傅里叶变换红外光谱(Micro-FTIR)的结果表明,铜离子能够抑制hIAPP多肽中α螺旋结构向β折叠的转变。另外,氨基酸定点突变实验结果表明,hIAPP(11~28)中的组氨酸(His18)可能对多肽的聚集行为和金属铜离子的相互作用起到了决定性的影响。     

基于生物模板法的钯纳米颗粒制备及其催化性能的研究

利用淀粉样蛋白纤维为生物模板合成了尺寸均匀且分散性较好的金属钯纳米颗粒.原子力显微镜的测试表明,钯纳米颗粒的平均粒径大小为(12.8±0.5)nm.利用X射线光电子能谱对钯纳米颗粒/胰岛素进行化学组分表征,最后将钯纳米颗粒/胰岛素催化剂应用于Suzuki交叉偶联催化反应以及过氧化氢的检测.实验结果表明,生物模板制备的钯纳米颗粒催化剂具有高效的催化性能,可用于多种铃木交叉偶联反应,并能很好地检测低浓度的过氧化氢溶液.     

n维固体带间光学性质与振子模型 n/2次积分关系

本文证明,n维固体临界点附近的带间介电函数及其微分谱可用n/2次积分分别从振子的介电函数及其微分谱求出。n维固体带间光谱中的振子物理特征通过n/2次积分算符的作用表现出来。文中讨论了带间跃迁与振子模型,光学性质与维度性之间的物理联系。在固体带间光谱的分数次积分表达式中,维度n可以推广到分数维数。 关键词：