Softness of Nuclear Matter and the Production of Strange Particles in Neutron Stars

In the various models,we study the influences of the softness of nuclear matter,the vacuum fluctuation of nucleons and σ mesons on the production of strange particles in neutron stars,We find that the stiffer the nuclear matter is,the more easily the strange particles is produced in neutron stars.The vacuum fluctuation of nucleons has large effect on strange particle production while that of σ meson has little effect on it.     

Magnetic properties and microstructure of HDDR isotropic Nd-Dy-Fe-Co-B bonded magnets with high coercivity

The effect of small amount of Co and Dy addition on the magnetic properties of HDDR isotropic Nd-Dy-Fe-Co-B bonded magnets was investigated. The experimental results show that the intrinsic coercivity H_cj and the reversible temperature coefficient of remanence of (Nd_0.65 Dy_0.35)_12.5-(Fe_0.9Co_0.1)₈₁B_6.5 magnet were 1.53 MA·m^-1(19.3 kOe) and -0.059%/°C (25–155°C), respectively. The high coercivity and low temperature coefficient of the magnet are due to the enhanced anisotropy field, increased Curie temperature and improved microstructure by Dy and Co addition.     

掺铒氟(卤)磷碲酸盐玻璃的上转换发光性能研究

研究了掺铒氟(卤)磷碲酸盐玻璃的吸收光谱和上转换荧光光谱，探讨了Er³⁺在 氟(卤)磷碲酸盐玻璃中的上转换发光机理.在975nm激光二极管抽运下产生强烈的上转换红光 及绿光，且红光的发光强度要远远大于绿光.以PbCl₂取代PbF₂后， 红光的发光强度下降，而绿光却没有明显变化；以ZnCl₂取代ZnF₂ 达5mol%时，红光和绿光的发光强度均明显增大. 关键词： 氟(卤)磷碲酸盐玻璃 上转换发光 3+离子')" href="#">Er³⁺离子     

无线通信系统电磁脉冲传导防护组件设计与有效性试验验证

为提高甚高频无线通信系统的抗高空电磁脉冲能力,基于易损性分析结果,确定了瞬态泄流和稳态滤波联合防护的设计思路以及设计指标,并研制了防护样件。使用20 ns/500 ns传导注入波形开展防护组件脉冲注入试验,比系统原始防护器残余电流峰值减小60%,启动时间缩短75%,作用时间缩短80%,注入波形低频能量限制（20 MHz以下）提高1个量级;以某甚高频无线通信系统为被试品,开展了防护组件加固验证试验,防护组件残余电流控制在10 A水平以下,被试系统功能和性能指标正常,验证了防护组件设计的有效性。     

Phonon dispersion relations of crystalline solids based on LAMMPS package

The phonon dispersion relations of crystalline solids play an important role in determining the mechanical and thermal properties of materials. The phonon dispersion relation, as well as the vibrational density of states, is also often used as an indicator of variation of lattice thermal conductivity with the external stress, defects, etc. In this study, a simple and fast tool is proposed to acquire the phonon dispersion relation of crystalline solids based on the LAMMPS package. The theoretical details for the calculation of the phonon dispersion relation are derived mathematically and the computational flow chart is present. The tool is first used to calculate the phonon dispersion relation of graphene with two atoms in the unit cell. Then, the phonon dispersions corresponding to several potentials or force fields, which are commonly used in the LAMMPS package to modeling the graphene, are obtained to compare with that from the DFT calculation. They are further extended to evaluate the accuracy of the used potentials before the molecular dynamics simulation. The tool is also used to calculate the phonon dispersion relation of superlattice structures that contains more than one hundred of atoms in the unit cell, which predicts the phonon band gaps along the cross-plane direction. Since the phonon dispersion relation plays an important role in the physical properties of condensed matter, the proposed tool for the calculation of the phonon dispersion relation is of great significance for predicting and explaining the mechanical and thermal properties of crystalline solids.     

高中物理实验与大学物理实验衔接现状调查及优化路径研究

基于在H校开展的“高中物理实验与大学物理实验课程衔接”的调查数据,对学生高中物理实验基础、高中与大学物理实验课程衔接存在的问题、原因等现状进行调查分析.调查结果显示：通过高中物理实验训练,学生的科学素养与态度得到较好的培养,但学生实验技能薄弱,进入大学后实验学习不适感较强.进一步研究显示,实验知识及教学方式差异大、动手能力要求提高等是造成学生学习不适感较强的主要原因.基于此,提出加强两个学段的合作交流、增设过渡性大学物理实验实验内容、设立实验课程“学业导师制”等优化措施帮助学生尽快适应课程变化、促进两个学段衔接过渡.     

氧化物正电荷影响下半导体空间电势的近似解析解研究

建立了半导体空间电势与界面氧化物正电荷之间联系的解析表达式。从一维情况下精确的泊松方程及其边界条件出发,对N(P)型硅半导体中的泊松方程作积累(耗尽)近似,根据德拜屏蔽效应对边界条件作截断近似,得到了氧化物正电荷影响下两种类型半导体内电势的近似解析解。另外,还进行了精确数值计算,并将它与近似解析解的结果进行比较,结果表明,当氧化物正电荷增加到使P型半导体发生强反型后,近似解不再成立。根据强反型的条件,给出了P型半导体中近似解的适用范围。     

一个正规化方案及弦理论中的共形反常

本文建议一个改进的正规化方法;并讨论玻色弦以及超弦的共形反常.     

用于TRIGA堆计算的WIMS-D/4核数据库的评价

分别应用ＮＪＯＹ和ＧＡＳＫＥＴ程序将ＺｒＨ中Ｈ、１６６Ｅｒ和１６７Ｅｒ核素的６９群微观截面补充到ＷＩＭＳ程序的核数据库中，形成了用于ＴＲＩＧＡ堆计算的ＷＩＭＳ－ＣＮＤＣ库和ＷＩＭＳ－ＮＩＮＴ库．为了评价这两个核数据库是否正确，将它们与国际上通用的ＴＲＩＧＡ堆计算库ＷＩＭＳ－ＩＪＳ作了比较，验证了氢化锆中氢的声子特征；采用上述三种库分别计算了ＴＲＩＧＡ堆燃料栅元（标准－８．５燃料元件、标准１２燃料元件、ＬＥＵ燃料元件和ＦＬＩＰ燃料元件）的群常数、倍增因子随燃耗的变化以及燃料的负温度系数，并对结果进行了分析比较．结果表明，ＷＩＭＳ－ＣＮＤＣ库和ＷＩＭＳ－ＮＩＮＴ库适用于ＴＲＩＧＡ堆的计算． The 69 groups constants of Hin ZrH,166Er and 167Er generated by NJOY and GASKET codes are inserted into WIMS nuclear data library WIMS CNDC and WIMS NINT libraries used on RTIGA rector calculation are obtainedIn order to check WIMS CNDC and WIMS NINT libraries,the scattering cross section is compared with that in WIMS IJS li brary.The group constant,K->∞ and temperature coefficient are calculated by using WIMS C NDC,WIMS NINT and WIMS IJS.The results show the both libraries are...