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节点刚度对钢结构的抗震性能有很大的影响。基于模态推覆分析MPA方法,初步探讨了节点半刚性对钢交错桁架在大震作用下抗震性能的影响。运用通用有限元软件SAP2000建立了平面模型,并修改节点塑性铰的属性和初始刚度来模拟钢交错桁架的半刚性节点,对比发现采用了半刚性节点的钢交错桁架,相对于完全刚接的情况,其基本自振周期、楼层侧移和层间位移角明显增大,塑性铰分布较为分散,数量减少,在大震下的耗能能力明显改善。

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Copyright of Computer Engineering & Science / Jisuanji Gongcheng yu Kexue is the property of Computer Engineering & Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Acute-on-chronic liver failure (ACLF) is a critical disease in clinical practice and has a mortality rate as high as 80%. At present, there are still no ideal therapeutic measures for ACLF. Stem cell transplantation has unique advantages in the treatment of ACLF; however, there are still some issues regarding the research on stem cell transplantation, which limit its clinical application. This article elaborates on conventional treatment methods, source of stem cells, transplantation approach, and related issues, in order to provide help for further studies. [ABSTRACT FROM AUTHOR]

Objective To study the effect of meropenem in rescuing human foreskin firoblasts （hFFs） contaminated by bacteria and observe the morphous and proliferative ability of hFFs after rescued successfully. Methods 14 batches of hFFs contaminated by bacteria were randomly divided into meropenem group and double antibiotics group. hFFs contaminated by bacteria were rescued with meropenem and double antibiotics method respectively. Morphology of hFFs after rescued successfully were observed with inverted microscope and proliferative ability was detected by growth curve. Results 6 batches of bacterial contamination in meropenem group were eliminated. 1 batch of bacterial contamination in double antibiotics group was eliminated. Morphology and proliferative ability of hFFs after rescued successfully had no obviously change. Conclusion Meropenem can eliminate bacterial contaminations of hFFs. There is no influence on morphology and proliferative ability of hFFs and it will provide the reference for saving the precious cell contaminated by bacteria. [ABSTRACT FROM AUTHOR]