排序方式: 共有14条查询结果,搜索用时 15 毫秒
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采用左旋聚乳酸(PLLA)为基材研究静电纺丝工艺过程对聚乳酸纤维形貌和性能的影响,主要包括环境湿度、纺丝溶液浓度、接收转速、收集距离、注射泵推注速度、附加电压等过程参数。结果表明,接收转速与纺丝液浓度分别是影响纤维定向排列程度和纤维直径的最主要因素,其次是接收距离、环境湿度、推注速度。当聚乳酸-氯仿溶液聚合物质量浓度为80 mg/mL、纺丝电压为25 kV、接收距离为20 cm、注射泵推注速度为0.3 μL/s以及接收转速为1500 r/min时,纤维取向性良好,平均直径为(0.94±0.21) μm,可达到模拟肌腱组织天然细胞外基质结构的要求。 相似文献
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基于ANSYS对非标准封板的应力线性化分析 总被引:1,自引:0,他引:1
结构的合理化使非标准件的应用日趋广泛,但也由于其结构尺寸等诸多方面的非标准性,使得在对其进行应力分析计算及安全评定时因无现行准则,而只能进行粗略计算。基于此,文章在利用ANSYS对非标准封板、非标准封板与壳体连接处的应力进行计算的基础上,对关键部位的应力做了线性化处理,并利用此结果进行了校核,为其安全评定及结构的优化提供了参考。 相似文献
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This paper presents a universal platform “uSensing”to support smartphones to communicate with sensor nodes in Wireless Sensor Networks (WSNs). Since phones have different CPU processers and operating systems, it is a challenge to merge these heterogeneities and develop such a universal platform. In this paper, we design both hardware and software to support the “universal”feature of uSensing: 1) “uSD”card: an IEEE 802.15.4 physical communication card with SD interface; 2) “uSink-Ware”: a WSNs middleware running on smartphones. Integrated with uSD card and uSinkWare, phones become mobile data sinks to access into WSNs and parse messages from sensor nodes. We demonstrate the proposed uSensing platform in a commercial smartphone to connect with our WSNs testbed, and validate that the smartphone has the same WSNs functions as commercial fixed sink. Additionally, we evaluate the performance of uSensing platform through measuring phone's CPU load and power consumption, and analyze the performance of these metrics theoretically. The results suggest that the phone-based mobile sink has enough capability to serve as a mobile sink of WSNs and can work up to twenty hours due to low power consumption. 相似文献
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