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涂覆新一代涂层体系的光纤拉伸性能测试方法的探讨及改进
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作者 Long Han Xiaosong Wu +3 位作者 Steven R.Schmid Pratik Shah alex li Jackie Zhao 《现代传输》 2011年第5期55-59,共5页
对于光纤制造商而言,拉伸强度试验是最简单的传统光纤力学性能评估试验。为光纤引入最新一代辐射固化涂层时,在测量光纤拉伸强度过程中遇到一些与试验相关的问题。人们怀疑这些问题与新一代涂层体系关键性能的变化有关。我们努力去了解... 对于光纤制造商而言,拉伸强度试验是最简单的传统光纤力学性能评估试验。为光纤引入最新一代辐射固化涂层时,在测量光纤拉伸强度过程中遇到一些与试验相关的问题。人们怀疑这些问题与新一代涂层体系关键性能的变化有关。我们努力去了解究竟这些问题是与光纤内在特性相关(直接影响现场应用),还是仅仅取决于试验设置。通过仔细设计的实验,我们获得了一组由同一预制棒拉成的商用光纤,以及不同方法制成的不同涂层体系。研究了拉伸试验的设置(例如绞盘直径和夹紧技术)来理解新一代涂层性能及拉伸试验设置对光纤拉伸强度的影响。 展开更多
关键词 光纤强度 拉伸试验
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The wonders of BMP9:From mesenchymal stem cell differentiation,angiogenesis,neurogenesis,tumorigenesis,and metabolism to regenerative medicine 被引量:19
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作者 Sami Mostafa Mikhail Pakvasa +26 位作者 Elam Coalson Allen Zhu alex Alverdy Hector Castillo Jiaming Fan alex li Yixiao Feng Di Wu Elliott Bishop Scott Du Mia Spezia Alissa li Ofir Hagag Alison Deng Winny liu Mingyang li Sherwin S·Ho Aravind Athiviraham Michael J·Lee Jennifer Moriatis Wolf Guillermo A·Ameer Hue H·Luu Rex C·Haydon Jason Strelzow Kelly Hynes Tong-Chuan He Russell R·Reid 《Genes & Diseases》 SCIE 2019年第3期201-223,共23页
Although bone morphogenetic proteins(BMPs)initially showed effective induction of ectopic bone growth in muscle,it has since been determined that these proteins,as members of the TGF-b superfamily,play a diverse and c... Although bone morphogenetic proteins(BMPs)initially showed effective induction of ectopic bone growth in muscle,it has since been determined that these proteins,as members of the TGF-b superfamily,play a diverse and critical array of biological roles.These roles include regulating skeletal and bone formation,angiogenesis,and development and homeostasis of multiple organ systems.Disruptions of the members of the TGF-b/BMP superfamily result in severe skeletal and extra-skeletal irregularities,suggesting high therapeutic potential from understanding this family of BMP proteins.Although it was once one of the least characterized BMPs,BMP9 has revealed itself to have the highest osteogenic potential across numerous experiments both in vitro and in vivo,with recent studies suggesting that the exceptional potency of BMP9 may result from unique signaling pathways that differentiate it from other BMPs.The effectiveness of BMP9 in inducing bone formation was recently revealed in promising experiments that demonstrated efficacy in the repair of critical sized cranial defects as well as compatibility with bone-inducing bio-implants,revealing the great translational promise of BMP9.Furthermore,emerging evidence indicates that,besides its osteogenic activity,BMP9 exerts a broad range of biological functions,including stem cell differentiation,angiogenesis,neurogenesis,tumorigenesis,and metabolism.This review aims to summarize our current understanding of BMP9 across biology and the body. 展开更多
关键词 ADIPOGENESIS Bone morphogenetic proteins(BMPs) BMP9/GDF2 Mesenchymal stem cells(MSCs) METABOLISM OSTEOGENESIS Regenerative medicine TUMORIGENESIS
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基于凸模型的结构非概率可靠性指标及其求解方法研究 被引量:10
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作者 罗阳军 亢战 alex li 《固体力学学报》 CAS CSCD 北大核心 2011年第6期646-654,共9页
当不确定性信息量不足以精确确定概率模型时,基于凸模型的非概率可靠性理论为工程结构安全性提供一种有效的评估方法.论文基于材料、几何及荷载大小等不确定性因素扰动界限的多椭球模型描述,运用标准化变换和标准空间广义无穷范数度量,... 当不确定性信息量不足以精确确定概率模型时,基于凸模型的非概率可靠性理论为工程结构安全性提供一种有效的评估方法.论文基于材料、几何及荷载大小等不确定性因素扰动界限的多椭球模型描述,运用标准化变换和标准空间广义无穷范数度量,给出定义非概率可靠性指标的极小极大优化数学模型.该非概率可靠性指标可理解为结构所能容许的参数不确定范围与实际不确定范围的相对"长度"比值.通过对极限状态方程的线性化近似,推导优化问题的显式迭代公式,实现非概率可靠性指标的简便求解.数值算例验证了论文迭代算法的正确性和有效性. 展开更多
关键词 多椭球模型 非概率 广义无穷范数 可靠性指标 迭代算法
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