As a kind of capital operation way , m & a plays an important role in the promotion of the economic development of various countries . the second m & a tide in our country started in 1992 , and has been more and more active , and its influence on economy has been stronger and stronger . so to study m & a effects and the influence factors will make a great sense in instructing the m & a development in our country and creating conditions to bring its positive effects into play 20世纪90年代以来，全球掀起了第五次并购浪潮，作为一种资本运作方式，并购对各国经济发展起到重要推动作用， 1992年以来我国掀起了第二次并购浪潮并日益活跃，在经济中影响日益增强，因而考察并购的效应及影响因素，将对指导我国企业并购发展，创造条件发挥其积极效应有重要意义。
Part three answers the question " what is regional tourism integration " , and presents the theory of international regional tourism integration . proofed by the phenomena and practice of the existing cooperation of international regional tourism , part three will research the character , symbol , content , effect of international regional tourism integration in the light of the theory of economy integration and tourism 第三部分区域旅游一体化理论研究主要是嫁接经济一体化理论和旅游学理论，同时还借鉴国际关系等相关学科理论，并以全球已经形成的日益活跃的旅游区域合作现象和实践为立论的佐证，着重阐释了区域旅游一体化的特征和标志、旅游一体化的内容、旅游一体化效应和旅游一体化进程，从而完成理论的平台搭建，探讨了“何谓一体化” 。
Claw - free graphs have been a subject of interest of many authors in the recent years . the first motivation for studying properties of claw - free graphs apparently appeared from the beineke ' s characterization of line graphs in [ 4 ] , [ 5 ] . however , the main impulse that turned the attention of the graph theory community to the class of claw - free graphs was given in late 70s and early 80s . during the period some first results on hamiltonian properties were proved in [ 6 ] , [ 7 ] , [ 8 ] , [ 9 ] . prom then on , more and more authors began to study the problem of hamilton . they studied mainly in the following two aspects : cycle aspect and path aspect . we may obtain some results about cycle in [ 3 ] and [ 10 - 30 ] 研究该图类的最初动机来源于deineke [ 4 ] , [ 5 ]线图的特性，然而引起人们尤其注意是在70年代末80年代初，整个这个时期在[ 6 ] ， [ 7 ] ， [ 8 ] ， [ 9 ]中关于哈密顿性质的一些初步结果被证明从此用无爪图来研究哈密顿问题日益活跃，人们主要从以下两个方面来研究：圈方面和路方面其中关于圈方面的部分结果可参见文献[ 3 ]及[ 10 - 30 ]等
