After maxillary protraction and mandibular retraction with occipito - mental anchorage ( oma ) appliance on first stage , the patient was successfully treated with fixed orthodontic appliance with modified multiple loop edgewise archwire ( meaw ) and asymmetric elastics 本病例报告为一12岁女孩，主诉下颚前突及偏斜，经第一阶段以功能性颚骨矫正将上颚拉出及抑制下颚骨生长；第二阶段使用全口固定式矫正装置，以改良式meaw在3 ~ 4个月内改善齿列正中线，以及修正偏斜的下颚。
Moreover , according to the performance analysis , a dynamic modify lookahead algorithm is presented to solve the problem of impaction of lookahead on system performance . a dynamic execution rate regulation algorithm is presented to reduce the retraction rate for optimistic federate . the test result showed that these two algorithms could improve system performance 考虑到时间管理部分对邦元程序性能的影响，本文还针对保守邦元中lookahead的设置对系统性能的影响，提出了lookahead的动态修正算法；针对影响乐观邦元性能的关键因素，提出了动态调整邦元执行速度的算法来控制回卷概率。
Through the research of the tension in vivo , the immediate retraction rate and histology examination about the different ways and different maintaining , we get : the increase area of the rapid and conventional expansion has little difference with the expanded time ; however it has significant difference with the maintaining time . it shows that shortening the expanded time is feasible in clinic , but shortening the maintaining time is out of the question ; after the capsule is removed , immediate retraction rate of the expanded skin notably decreased , significantly different from those with intact capsule ; the collagen content of the rapid expansion is just the same as the conventional expansion , but the changes of the histology dependences on the maintaining time . comparison with conventional expansion , rapid expansion has no significant drawback ; maintaining a period after expansion can greatly increase the area of expanded skin and reduce immediate retraction 通过对不同扩张期、不同方式和不同维持期对扩张皮肤的在体张力、即时回缩和皮肤组织学的研究，得到：快速扩张和常规扩张最后获取的皮瓣，面北京工业大学工学博士学位论文一积增加差别不大；扩张皮肤的面积增加和张力下降与维持期的长短有关；而与扩张期的长短关系不大，说明在皮肤扩张术中可以缩短注水时间，但是维持时间不能缩短；扩张皮肤去除包膜后的即时回缩率下降，与未去除包膜的相比较有明显差异；快速扩张皮肤的胶原含量变化与常规扩张的基本一致，扩张皮肤的组织学变化与维持期的关系较为密切，与扩张方式关系不大；快速扩张和常规扩张相比，快速扩张没有明显的破坏作用；扩张结束后，维持一段时间，能有效的提高扩张面积且能有效地减少回缩。
This was due to three reasons : ( 1 ) baso4 particles were rigid inorganic particles , which could hinder the retraction of polymer molecules and decreased the elasticity . ( 2 ) a bad compatibility between baso4 and tpu , small interface adhesive force and the phase interface ready to separate . ( 3 ) during high content of baso4 , the tenacity of filament mainly depended on tpu , so that the strength decreased with the content of tpu in filament down 这是因为： baso _ 4属于刚性粒子，阻碍tpu大分子链的回缩，降低了纤维的弹性； baso _ 4与tpu相容性极差，共混时容易形成相界面，界面结合力小，受外力作用时相与相间容易发生分离，使纤维的力学性能下降； baso _ 4在高含量下，纤维强度主要由聚合物的力学性能决定，随着baso4含量的增加， tpu所占比例下降，从而在宏观上表现出纤维的力学性能下降。
( 4 ) we construct the concepts of stratified approximations and base in an l - fuzzy domain , and define uniformly continuous l - fuzzy domain and algebraic l - fuzzy domain by means of the concept of base for l - fuzzy domain , prove that they are generalizations of ordinary continuous domain and algebraic domain , when l is a completely distributive lattice in which 1 is a molecule and the minimal mapping on l preserves finite meet , the stratified approximation relations on a continuous l - fuzzy domain satisfy the property of stratified interpolations , and is consist of a base for the generalized scott topology on a continuous l - fuzzy domain ( x , e ) , and every continuous l - fuzzy domain can be seen as an l - fuzzy scott continuous retraction of some algebraic l - fuzzy domain ( 4 )在l - fuzzydomain中引进层次逼近和基的概念，用统一的基的方法定义了连续l - fuzzydomain和代数l - fuzzydomain ，证明了它们分别是通常的连续domain和代数domain的推广。当l是1为分子的完全分配格，并且其上的极小映射保有限交时，证明了连续l - fuzzydomain上的层次逼近关系满足层次插值性质，构成连续l - fuzzydomain ( x ， e )上广义scott拓扑的基，以及任意的连续l - fuzzydomain都可以作为某代数l - fuzzydomain的l - fuzzyscott连续收缩。
Chapter 2 of this paper , by using a new method of proof , we obtain the weak ergodic convergence theorem for general semigroups of asymptotically nonexpansive type semigroups in reflexive banach space . by theorem 2 . 1 of chapter 1 we get the weak ergodic convergence theorem of almost orbit for general semigroups of asymptotically nonexpansive type semigroups in reflexive banach space . by this method of proof , we give the weak ergodic convergence theorems for right reversible semigroups . by theorem 2 . 1 of chapter l , we generalize the result to almost orbit case . so we can remove a key supposition that almost orbit is almost asymptotically isometric . it includes all commutative semigroups cases . baillon [ 8 ] , hirano and takahashi [ 9 ] gave nonlinear retraction theorems for nonexpansive semigroups . recently mizoguchi and takahashi [ 10 ] proved a nonlinear ergodic retraction theorem for lipschitzian semigroups . hirano and kido and takahashi [ 11 ] , hirano [ 12 ] gave nonlinear retraction theorems for nonexpansive mappings in uniformly convex banach spaces with frechet differentiable norm . . in 1997 , li and ma [ 16 ] proved the ergodic retraction theorem for general semitopological semigroups in hilbert space without the conditions that the domain is closed and convex , which greatly extended the fields of applications of ergodic theory . chapter 2 of this paper , we obtain the ergodic retraction theorem for general semigroups and almost orbits of asymptotically nonexpansive type semigroups in reflexive banach spaces . and we give the ergodic retraction theorem for almost orbits of right reversible semitopological semigroups 近年来， bruck [ 5 ] ， reich [ 6 ] ， oka [ 7 ]等在具frechet可微范数的一致凸banach空间中给出了非扩张及渐近非扩张映射及半群的遍历收敛定理。 li和ma [ 13 ]在具frechet可微范数的自反banach空间中给出了一般交换渐近非扩张型拓扑半群的遍历收敛定理，这是一个重大突破。本文第二章用一种新的证明方法在自反banach空间中，研究了扬州大学硕士学位论文2一般半群上的( r )类渐近非扩张型半群的弱遍历收敛定理，即:定理3 . 1设x是具性质( f )的实自反banach空间， c是x的非空有界闭凸子集， g为含单位元的一般半群， s =仕工， 。
