I ain’t afraid of no ghost

This paper criticizes the traditional philosophical account of the quantization of gauge theories and offers an alternative. On the received view, gauge theories resist quantization because they feature distinct mathematical representatives of the same physical state of affairs. This resistance is overcome by a sequence of ad hoc modifications, justified in part by reference to semiclassical electrodynamics. Among other things, these modifications introduce ”ghosts”: particles with unphysical properties which do not appear in asymptotic states and which are said to be purely a notational convenience. I argue that this sequence of modifications is unjustified and inadequate, making it a poor basis for the interpretation of ghosts. I then argue that gauge theories can be quantized by the same method as any other theory. On this account, ghosts are not purely notation: they are coordinates on the classical configuration space of the theory—specifically, on its gauge structure. This interpretation does not fall prey to the standard philosophical arguments against the significance of ghosts, due to Weingard. Weingard’s argumentative strategy, properly applied, in fact tells in favor of ghosts’ physical significance.     

普通物理双语教学模型探索

本文阐明了对普通物理实施双语教学的重要性。对普通物理双语教学过程中各个环节进行了探索和实践,期望进一步推进我院双语教学的步伐和改善双语教学模式。     

大学物理课堂教学方法探究

针对大学物理课程"教"与"学"过程中存在的问题,提出了改进大学物理教学质量的几种方法与手段,以激发学生的学习兴趣,培养学生的创新能力,提高大学物理课程的教学效果。     

医学物理实验教学现状及改革探索

本文分析了目前医学物理实验教学中存在的问题，探讨了教学改革的措施和方法，提出了多层次教学内容，多方式教学方法，多样化评价体系。     

类stober法可控制备单分散TiO2纳米微球

采用类Stober法,以钛酸正丁酯为钛源,反应温度为130℃,可控制备粒径尺寸均一的单分散TiO_2纳米微球.通过调节反应时间、溶液的pH值,单分散TiO_2纳米微球的直径可以在几十到一千纳米范围内被精确调控.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)仪对所制备的TiO_2纳米微球进行了表征.结果显示样品为无定形结构,可通过进一步的水热晶化提高样品的结晶度.此单分散TiO_2纳米微球有望在光催化机理研究、太阳能敏化电池、光子晶体等方面具有很好的应用.     

双端热透镜Z型固体激光腔图解分析

采用传播圆图解方法研究了具有双端热透镜的Z型折叠固体激光腔的工作特性,得到了谐振腔各腔臂中的光模参数bt1,bt2,b2及光斑尺寸wt1,wt2,w2随激光介质的热动力参数1/ft1及1/ft2的变化关系;结果表明通过合理选择参数可对腔的热稳定范围及基模光斑尺进行调控,其关键参数是对称的第1、3臂的长度l01 f1(或l02 f2),其值越小,腔的热稳定区越宽,同时激光晶体处的基模光斑越小.第2臂中的参数δ对热稳区宽度没有明显影响,但δ值越大,对应的光斑半径wt1及wt2也越大.     

地方工科大学实施大学物理新基本要求的探索与实践

分析了当前地方工科大学实施大学物理课程教学基本要求存在的问题,结合本校实际,在实施新《基本要求》上进行了积极的探索与实践,取得了初步成果。     

Exploring non-equilibrium statistical ensembles

Since Gibbs synthesized a general equilibrium statistical ensemble theory, generalizing the Gibbsian theory to non-equilibrium phenomena has been a dream for some theorists. However, the status of the theory for the non-equilibrium ensemble formalism is not as well established as the Gibbsian ensemble theory. In this work, we explore the formalism behind the non-equilibrium statistical ensemble theory based on the sub-dynamic kinetic equation originating from the Brussels-Austin school and develop...     

我所经历的5个物理实验

结合亲身经历的5个物理实验,讲解了从事科学研究的独到体会。     

《列奥纳多·达·芬奇笔记》中的力学思想研究

<列奥纳多·达·芬奇笔记>是研究中世纪科学史的一份重要史料.这里初步归纳整理了其中一些重要的力学认识结果,分析讨论了这些内容的合理性及局限性,指出了其历史价值和思想认识基础.认为列奥纳多是站在亚里士多德肩膀上的一位中世纪时期的科学巨人,其笔记中既体现了亚里士多德的自然哲学传统,也散发着近代科学的气息.