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八氨苯基低聚硅倍半氧烷改性环氧树脂的力学和阻燃性能 被引量:5
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作者 刘磊春 吴义维 +1 位作者 张文超 杨荣杰 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2021年第3期50-58,共9页
八氨苯基低聚硅倍半氧烷(OAPS)用于改性环氧树脂,以提高固化树脂的玻璃化转变温度(Tg)、力学性能和阻燃性。用差示扫描量热法(DSC)研究了固化动力学,结果表明,OAPS具有与固化剂异佛尔酮二胺相似的固化行为。DSC和傅里叶变换红外光谱测... 八氨苯基低聚硅倍半氧烷(OAPS)用于改性环氧树脂,以提高固化树脂的玻璃化转变温度(Tg)、力学性能和阻燃性。用差示扫描量热法(DSC)研究了固化动力学,结果表明,OAPS具有与固化剂异佛尔酮二胺相似的固化行为。DSC和傅里叶变换红外光谱测试表明,OAPS通过化学键交联到了网络结构中,从而改善环氧树脂复合材料的性能。通过对复合材料的力学性能分析发现,其拉伸强度提升了104%。动态力学热分析表明,复合材料的Tg提高。热重分析显示,OAPS提升了复合材料的热稳定性。锥形量热分析表明,复合材料的热释放速率峰值下降,点火时间明显延长。垂直燃烧(UL-94)测试证明,熔融滴落现象显著改善。因此,OAPS能够改善环氧树脂的力学性能、热稳定性和阻燃性。 展开更多
关键词 八氨苯基低聚硅倍半氧烷 环氧树脂 阻燃性能 力学性能 固化动力学
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Integrating operations research into green logistics:A review
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作者 yiwei wu Shuaian WANG +1 位作者 Lu ZHEN Gilbert LAPORTE 《Frontiers of Engineering Management》 CSCD 2023年第3期517-533,共17页
Logistical activities have a significant global environmental impact,necessitating the adoption of green logistics practices to mitigate environmental effects.The COVID-19 pandemic has further emphasized the urgency t... Logistical activities have a significant global environmental impact,necessitating the adoption of green logistics practices to mitigate environmental effects.The COVID-19 pandemic has further emphasized the urgency to address the environmental crisis.Operations research provides a means to balance environmental concerns and costs,thereby enhancing the management of logistical activities.This paper presents a comprehensive review of studies integrating operations research into green logistics.A systematic search was conducted in the Web of Science Core Collection database,covering papers published until June 3,2023.Six keywords(green logistics OR sustainable logistics OR cleaner logistics OR green transportation OR sustainable transportation OR cleaner transportation)were used to identify relevant papers.The reviewed studies were categorized into five main research directions:Green waste logistics,the impact of costs on green logistics,the green routing problem,green transport network design,and emerging challenges in green logistics.The review concludes by outlining suggestions for further research that combines green logistics and operations research,with particular emphasis on investigating the long-term effects of the pandemic on this field. 展开更多
关键词 green logistics operations research ENVIRONMENT literature review
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Is uncertainty always bad for the performance of transportation systems? 被引量:2
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作者 Wei Wang yiwei wu 《Communications in Transportation Research》 2021年第1期176-181,共6页
Uncertainty is usually perceived as having negative effects on transportation systems,such as increasing operation cost,decreasing resource utility,and reducing customer satisfaction.However,it is unclear whether this... Uncertainty is usually perceived as having negative effects on transportation systems,such as increasing operation cost,decreasing resource utility,and reducing customer satisfaction.However,it is unclear whether this perception is universally true or is true only under certain conditions.This research compares the performance of transportation systems with uncertain parameters with the performance of the same systems in which the uncertain parameters are replaced by their expectations.The analyses prove that uncertainty can have negative,negligible,and positive impact on the performance of transportation systems under different conditions. 展开更多
关键词 Impact of uncertainty Transportation system Stochastic models
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