The director in nlc cell may be expressed by one angle parameter 9 or , and it is called one dimension problem ; the director expressed by two angle parameters 6 and , called two dimension problem ; the paper consists of two absolute parts : l . the first order freedricksz transition at saturation point for the weak anchoring nlc cell the first order freedricksz transition ( the first order transition ) at threshold point has been studied by a lot of theoretical works 液晶盒內指向矢可用一個角量或表示稱為一維問題,需要用兩個角參量和表示稱為二維問題。本文由兩個獨立的工作構成: 1弱錨定向列液晶盒在飽和點的一級freedericksz轉變現(xiàn)有的理論工作都討論在閾值點的一級freedericksz轉變(一級轉變) 。
The results indicate : when reduced anchoring strength a is large and = 0 or > 0 , the first order transition may occur at threshold point or at saturation point ; when a is very lager and = 0 and > 0 , the uniform twisted solution jumps directly to the saturation solution 結果表明:當反映錨定強度的參量( = k _ ( 22 ) ? al )較大,且修正參量= 0或0時,在閾值點或飽和點可以發(fā)生一級轉變。當很大,且修正參量= 0或0時,還會發(fā)生均勻扭曲解直接轉變?yōu)轱柡徒狻?
In threshold point and saturation point as well as between two points , the possible relations between a and the external magnetic field and the anchoring parameters of substrates are studied . we find out that the sign of is opposite , but the value is invariable when the positions of above and below substrates are interchanged 研究了閾值點和飽和點以及以上兩者之間時,與外加磁場以及基板錨定參數(shù)的各種可能的關系,發(fā)現(xiàn)當上、下基板的位置互換,對稱破缺的符號將會改變,而大小不變。