We improve this method as follows : ( 1 ) single jacobi elliptic function is replaced with an unified jacobi elliptic equation , thus repeated calculation is avoided ; ( 2 ) extending the expansion method from sole - function to double - function form , the more solutions for npde are obtainted ; ( 3 ) using many of jacobi elliptic functions besides ordinary three kinds , the content of solutions represented by jacobi elliptic by the jacobi elliptic function expansion method and computer functions is very abundant 我们对此方法做了如下几点改进：用统一的jacobi椭圆方程组代替单个的jacobi椭圆函数，避免重复计算；将jacobi椭圆单函数展开方法推广到jacobi椭圆双函数展开，这样可以得到更多的解；将通常使用的三个jacobi椭圆函数推广到多个jacobi椭圆函数，丰富了用jacobi椭圆函数表示的解的内容。利用改进的jacobi椭圆函数展开法，求解了bbm方程和boussinesq方程组。
In order to provide theoritical foundation for the utilization of jerusalem artichoke ( ja ) resource , culturation of bifidobacteria and development of bifidobacteria products . this paper rather systernly studied the effects of ja on the growth of bifidobacteria , using jerusalem artichoke juice ( jaj ) and jerusalem artichoke powder ( jap ) as experimental material . in the first place , the effects of ja on the growth of bifidobacteria in vitro were studied . the results indicated that : jaj could stimulated the growth of b . longum ( blm ) and b . bifidwn ( bbm ) ; the more jaj content was added , the more promoting action was apparent ; the promoting action also varied from the different species . adding jap ( 3 % ) to skim milk could decrease the time of milk - solidfying of blm and bbm , and could increase the acid production in skim milk of the strains tested . secondly , bifidobacterium medium was developed using jaj as main material 本文以菊芋汁和菊芋粉为主要材料，较系统地研究了菊芋对双歧杆菌生长的影响，以期为进一步开发利用菊芋资源、双歧杆菌的培养及其制品开发提供理论依据。菊芋在体外对双歧杆菌生长的影响试验表明，菊芋汁在体外对长双歧杆菌( blm )和两歧双歧杆菌( bbm )的生长具有促进作用，其效果随着菊芋汁添加量的增加而增加，并且对不同菌种的促生长效果存在差异；在脱脂乳中添加3的菊芋粉可以缩短blm和bbm的凝乳时间，其原因可能为促进了试验双歧杆菌在脱脂乳中的产酸。
Chapter 1 , give the physical background for the nonlinear evolution equa - tions , such as kdv equation , bbm equation , gbbm equation , kdv - burgers equation , coupled generalized nonlinear wave equation . we look back to some important results , review our work for doing . chapter 2 , consider a class non - homogeneous bbm equation 本文由六章组成：第一章，给出了kdv 、 bbm 、 gbbm 、 kdv - burgers 、广义耦合的非线性波动方程组等非线性发展方程的的物理背景，回顾了已有的一些重要结果，简述了本文主要的研究结果。
