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纳米金刚石含量对网状结构钛基复合材料组织与性能的影响
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作者 刘腾飞 张法明 王娟 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2020年第3期1068-1074,共7页
通过对钛粉表面修饰聚乙烯醇,利用交联反应使纳米金刚石(NDs)均匀分布在球形钛粉末表面,然后采用放电等离子烧结技术成功制备了网状结构分布的纳米金刚石增强钛基复合材料。研究了不同NDs含量对复合材料组织结构、导热性能与压缩性能的... 通过对钛粉表面修饰聚乙烯醇,利用交联反应使纳米金刚石(NDs)均匀分布在球形钛粉末表面,然后采用放电等离子烧结技术成功制备了网状结构分布的纳米金刚石增强钛基复合材料。研究了不同NDs含量对复合材料组织结构、导热性能与压缩性能的影响。结果表明,部分NDs与Ti原位反应生成了Ti C,其与残留的NDs呈三维网络状分布在TA1纯钛基体中,网络尺寸为100~200μm。导热测试结果表明,随着增强相含量的增加,复合材料的热导率呈下降趋势;压缩实验表明:Ti-1.0%NDs(质量分数)复合材料有较优异的性能,强度提高的同时仍然保持了高塑性。材料断裂时主要是沿网状结构界面处断裂,几百微米尺寸的网状结构起到加固梁的作用,而网络状内部存在着大量纯钛晶粒仍保持较低的硬度和良好的塑性,从而有效的调和了钛基复合材料强度和塑性的矛盾。 展开更多
关键词 钛基复合材料 网状结构分布 纳米金刚石 导热性能 压缩性能
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Wavelength Reservation Scheme with Switch Fabric Status in Distributed Mesh Optical Networks
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作者 陆丽华 曾庆济 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第3期325-330,共6页
A new wavelength reservation scheme is proposed the reconfiguration times of optical cross-connects (OXCs) for we consider the reconfiguration information of switch fabrics to mitigate the connection setup time and ... A new wavelength reservation scheme is proposed the reconfiguration times of optical cross-connects (OXCs) for we consider the reconfiguration information of switch fabrics to mitigate the connection setup time and minimize WDM optical networks in this study. In this scheme, in the signaling protocol, which is designated as the signaling with switch fabric status (SWFS). Distributed reservation algorithms will reserve the wavelength with minimum of reconfiguration times of OXCs along the route. Simulation results indicate that the proposed schemes with switch fabrics status have shorter setup time, lower switching ratio as well as better blocking performance than those of the traditional classic schemes. Moreover, the proposed schemes with SWFS significantly reduce the number of switch fabrics that need to be reconfigured. 展开更多
关键词 OPTIMIZATION distributed lightpath establishment signaling protocols wavelength reservation wavelength-routed networks switch fabrics
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