Anisotropic Open Cosmological Models of Spin Matter with Magnetic Moment     

沈利明  孙迺疆  吉桂芳  陆惠卿 《上海大学学报(英文版)》2001,5(3):196-200

We have derived a set of field equations for a Weyssenhoff spin fluid including magnetic interacton among the spinning particles prevailling in spatially homogeneous,but anisotropically cosmological models of Bianchi type V based on Einstein-Cartan theory.We analyze the field equations in three different equations of states specified by p=1(1/3)ρand p=0,The analytical solutions found are non-singular provided that the combined energy arising from matter spin and magnetic interaction among particles overcomes the anisotropy energy in the Universe,We have also deduced that the minimum particle numers for the radiation(p=(1/3)ρ) and matter(p=0) epochs are 10^88 and 10^108 respectively.the minimum particle number for the state p=ρ is 10^96,leading to the conclusion that we must consider the existence of neutrinos and other creation of particles and anti-particles under torsion and strong gravitational field in the early Universe.  相似文献   

农村英语教学之我见     

吉桂芳 《中学教学参考》2012,(19):120-120

对于缺乏英语环境的农村学生而言,他们对于学习英语的热情不高,甚至部分学生还有厌学的心理,从而造成了英语学困生越来越多。面对这样的现实,我们农村英语教师要有积极的态度,根据当地学生的实际情况,面对学生,认真把握好他们的心理特点,采取有效的教育教学措施,达到全面提高英语教学质量的目的。一、兴趣——英语学习的天然助力任何学习的原始动力必然来源于学生自身的兴趣,兴趣是青少年在青春期学习的内在动力。＂兴趣是最好的老师＂不仅仅是从教育学的角度出发的理论,也是从青少年心理学角度出发的观念。  相似文献