静电场中电场强度的数值意义

“近场强远场弱”是静电场的普遍特点,宏观带电体的静电场是点电荷电场叠加的结果.本文以静电场中两个实际的电场强度问题为例,用相对数值比较了电荷分布对电场强度的贡献,阐述电场强度“近场强远场弱”的数值意义.     

Magnetic ordering of the bond—diluted two—dimensional mixed spin Ising system

Numerical and analytical results are presented for the magnetic ordering in a bond-diluted spin-1/2 and spin-1 mixed transverse Ising system with a single-ion anisotropy on a honeycomb lattice.Special emphsis is placed on the magnetic ordering under the bond dilution and percolation threshold.We discuss in detail the influence of transverse fields of different sublattics on the normal magnetic ordering and on the magnetic ordering induced by single-lon anisotropy.We find that the magnetic ordering of a system exhibits an explicit difference when receiving the transverse field.This phenomenon has not been revealed in previous reports.     

多倍频简谐振动合成实验仪

研制了能够直观演示多倍频简谐振动合成的仪器.利用单片机控制直接数字合成芯片,精确产生任意频率和相位的4路正弦信号,通过模拟加法电路实现信号的合成.通过与计算机仿真结果的比较,实验仪能够很好地演示多倍频简谐振动的合成.     

不同坐标系对质点运动的描述

从三个方面给出不同坐标系对质点运动的描述,不同坐标系引出物理量的不同表示、运动的不变量和问题的不同理解,并分析不同坐标系运用的意义．     

质点系中阿特伍德机对有关定理的检验意义

将质点系中有关定理运用于阿特伍德机,文章以阿特伍德机为典型模型并阐述了对质点系中有关定理自洽性的检验.     

横向随机晶场Ising模型的相图和磁化行为研究

在有效场理论和切断近似框架内，选择自旋S=1的二维方格子，研究横向随机晶场Ising模型的相图和磁化行为，重点是横向随机晶场浓度和晶场比率对相图和磁化的影响.给出了i>T-D_x空间的相图和m-T空间的磁化图.在晶场稀疏情况下，负晶场方向存在临界温度的峰值，正方向可出现重入现象.晶场比率取+0.5和-0.5时，磁有序相范围缩小，特别是晶场比率取-0.5时，随晶场浓度的降低，临界温度峰值从横向晶场负方向渡越到正方向.固定某一负晶场值，不同晶场比率的磁化行为有明显差异.同时与纵向稀疏晶场Ising模型结果进行有意义的比较. 关键词： 横向随机晶场Ising模型 相图 磁化行为     

时间间隔的正确理解

在狭义相对论框架中研究不同惯性参照系时间间隔问题并讨论了两个典型的问题,通过讨论,明确时间膨胀和固有时的严格意义.     

Critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume——Capel model in the presence of an applied field

This paper studies the critical behaviours and magnetic properties of three-dimensional bond and anisotropy dilution Blume--Capel model (BCM) in the presence of an applied field within the effective field theory. The trajectory of tricritical point, reentrant transitions and degenerate patterns of anisotropy are obtained both for the bond and the anisotropy dilutions. The global phase diagrams demonstrate unusually reentrant phenomena. The temperature dependences of magnetization curves undergo remarkable spin glass behaviour at low temperatures, and transform from ferromagnetism to paramagnetism at high temperature in applied fields. Temperature dependence of magnetic susceptibility curve is in qualitative agreement with experimental result.     

三个简谐振动合成的拍现象和实验仪

在三个简谐振动合成的拍现象进行理论分析基础上,提出了一种能够准确演示三个简谐振动拍现象的实验仪器,对进行的演示和计算机仿真比较,所给结果正确,并比传统演示手段更加直观,演示内容更加丰富.