非平衡相变的临界耗散行为  

Critical Dissipative Behaviour of Nonequilibrium Phase Transformation

作　　者：蔡绍洪[1] 戴陵江[1] 

机构地区：[1]贵州大学物理系,贵阳550025

出　　处：《贵州大学学报（自然科学版）》1997年第2期88-96,共9页Journal of Guizhou University:Natural Sciences

基　　金：贵州省科学基金

摘　　要：在非平衡相变规格化模型基础上，讨论了非平密相变与平衡相变的差别与联系．考察了非平密相变临界参考态的耗散情况，引入一参量MD来衡量其临界耗散的强弱程度．在临界点的无限小邻域内导出了MD与系统序参量的依赖关系．MD的临界奇异性用临界耗散指数θ来描述，在此我们计算给出了非平衡相变中三类临界的θ值．把平衡相变的临界参考态作为非平衡相变临界参考态的一种极限情况，将二者统一在一起．On the basis of the standardized model of nonequilibrium phase trans formatiion, the difference and relations between tow phase transform of equilibrium and nonequilibrium are discussed. The dissipative condition of the critical reference state in nonequilibrium phase transformation is analysed. A dissipative patrameter MD is introduced to judge the dissipative intensity of nonequilibrium system. The relation that MD depends on orderparameter u is derivod in the critcal point vicinity of the Nonequilibrium phase A transition critical dissipative exponent e is used to describe the critical behaviour of MD in nonequilbrium phase transition. Three class θvalues are derived. In addition, the two critical phase trans for mation are unified when the critical reference stats of equilibriumphase transition is treated as a special case of the nonequilibrium ones.

关 键 词：非平衡相变 临界态 耗散参量 耗散指数 相变 

分 类 号：O414.21[理学—理论物理]