多源异构数据环境下基于模糊积分融合的公租房退出方法

为有效解决公租房退出问题,提出一种基于多源异构数据的模糊积分融合退出方法,该退出方法首先给出一种多源异构数据的同构化方法,然后针对常用模糊测度确定方法原理复杂、计算困难的问题,提出一种原理简单、易于计算的模糊测度确定方法,该模糊测度确定方法利用单个属性的相对重要程度和两两属性之间的交互度计算单个属性的全局重要程度,最后,根据模糊测度的单调性和有界性通过专家逐级打分计算各子属性集的重要程度。实例验证表明所提出的退出方法可行、有效。     

表面修饰的ZnS:Mn量子点的发光性质及其对生物分子的检测

采用水热法制备了ZnS:Mn量子点,探讨了掺杂离子浓度对ZnS:Mn量子点的晶体结构和发光性质的影响。通过荧光光谱对样品进行表征。结果表明:掺杂离子的摩尔分数达到2%时,ZnS:Mn量子点在595 nm附近的发光最强;继续增加掺杂浓度反而出现荧光猝灭的现象。本文还研究了表面修饰对量子点形貌和发光性质的影响。通过透射电子显微镜(TEM)观察样品的形貌,发现经过3-巯基丙酸(MPA)修饰后的样品表面团聚现象得到改善,并且尺寸单一、单分散性较好,平均粒径约为5 nm。经过修饰后的样品减少了表面非辐射性缺陷中心,使掺杂Mn2+所引起的595 nm附近的发射峰强度增大。将MPA修饰后的ZnS:Mn量子点与牛血清白蛋白(BSA)分子进行生物偶联,并利用BCA法对偶联上的蛋白含量进行定量检测,结果显示经过修饰后的量子点偶联蛋白的能力更强。     

Second Order Correction of Relativistic Optical Potential

The imaginary part of the off-energy shell optical potential of a nucleon in nuclear matter, where the polarization and correlation contribution of the exchanges of the σ and ω mesons are taken into account, is derived in the framework of the relativistic meson-nucleon field theory. The second order correction of the real part of the optical potential is calculated in terms of the dispersion relation and the effective mass of a nucleon in the nuclear medium is also investigated in this paper.     

Neutron Relativistic Phenomenological and Microscopic Optical Potentials

The experimental data of the neutron total cross section σ_t,nonelastic cross section σ_non and elastic scattering angular distribution σ_el(θ) for ten target nuclei ranging from ¹²C to ²³⁸U with incident energies E_n=20—1000MeV were used to optimize the relativistic phenomenological optical potential (RPOP) through automatic search of the best parameters by computer.In addition,a relativistic microscopic optical potential (RMOP) based on Walecka model were also used to analyze the same data and compare with the RPOP.
Through comparison between these two kinds of relativistic optical potential hints in improving both the RMOP and RPOP is indicated.     

Three-Parameter Liquid-Drop Model Describing a Large-Amplitude Collective Nuclear Motion

In this paper, the liquid-drop model with three parameters {c, h,a} is used to describe symmetric or asymmetric fission process. The analytical expression of the effective moment of inertia is given. The inertial and frictional tensors of nucleus are evaluated by the Werner-Wheeler method. Based on a standard liquid-drop model, the Coulomb energy and surface energy are accurately calculated. The scission point of the fissioning nucleus is defined by energy criteria. The salient features of the dynamical coefficients are discussed.     

EFFECT OF NUCLEAR VISCOSITY ON FISSION PROCESS

According to the fission diffusion model,the deformation motion of fission nucleues is regarded as a diffusion process of quasi-Brownian particles under fission potential,Through simulating such Brownian motion in two dimensional phase space by Monte-Carlo method,the effect of nuclear viscosity on Brownian particle diffusion is studied,Dynamical quantities,suchas fission rate,kinetic energy distribution on scission,and so on are numerally calculated for various viscosity coefficients,The results are reasonable in physics,This method can be easily extended to deal with multi-dimensional diffusion problems.     

A CHIRAL SOLITON MODEL OF N AND △ WITH FOUR-FERMION INTERACTION

The four-fermion terms are introduced to investigate the effects of vector mesons in the σ model. A self-consistent solution is achieved in the mean field approximation by using the hedgehog ansatz.The static properties of nucleon are calculated, which are found to be in reasonable agreement with experiments.