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。
Because the large conformational changes occurring upon complex formation are frequently confined to the protein surface , especially for the side chains of flexible amino acids arg , lys , asp , glu and met , the locations of the mass centers and the values of radii of these residues are modified for modeling protein surface . this tolerates overlap in some degree between the amino acid side chains on the surfaces of the receptor and the ligand 由于蛋白质表面氨基酸残基arg 、 lys 、 asp 、 glu和met具有较大的柔性，因此，北京工业大学工学博士学位论文一我们对蛋白质分子表面的这五种氨基酸模型作了修正，调整了残基球心的位置和半径的数值，使分子表面的氨基酸残基在对接时具有一定程度的可交叠性。
The roles that the hydrogen and the substrate negative bias play in the low temperature deposition of p - sic film were further well investigated . it was found that proper hydrogen concentration in gas flows and the corresponding substrate bias are the prerequisite for low temperature synthesis of p - sic film 北京工业大学工学博士学位论文一对氢气和衬底负偏压在b七薄膜低温沉积中的作用进行了研究，发现合适比例的氢气及相应的衬底负偏压，是低温制备上七c薄膜必须的条件。
