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改性聚乙烯泡沫材料介电性能与力学性能 被引量:1
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作者 金鑫 薄睿恬 +3 位作者 柳军旺 王春锋 王永亮 韩志东 《塑料》 CAS CSCD 北大核心 2022年第3期1-6,49,共7页
以硼硅酸盐空心玻璃微球(BSH)为介电填料,乙烯-醋酸乙烯酯共聚物(EVA)为改性树脂,采用偶氮二甲酰胺(AC)发泡方法制备了改性聚乙烯(PE)泡沫材料,研究了复合材料的形貌结构及其介电性能与力学性能。研究结果表明,BSH能够有效地降低PE的介... 以硼硅酸盐空心玻璃微球(BSH)为介电填料,乙烯-醋酸乙烯酯共聚物(EVA)为改性树脂,采用偶氮二甲酰胺(AC)发泡方法制备了改性聚乙烯(PE)泡沫材料,研究了复合材料的形貌结构及其介电性能与力学性能。研究结果表明,BSH能够有效地降低PE的介电常数,同时对泡沫材料的孔结构与介电性能具有显著影响,在1 kHz频率下,PE/BSH的介电常数降低至2.25,PE/BSH-f的介电常数增加至2.36;利用EVA含量对材料相结构的影响,可以调控泡沫材料的孔结构与介电性能,并且EVA含量较高的复合材料的介电常数也较高,但是介电损耗有所下降;EVA和BSH能够显著改善泡沫材料的拉伸性能,与纯PE泡沫材料相比,PE7/EVA3/BSH-f和PE5/EVA5/BSH-f的拉伸强度分别提高了173%和944%。二者复合使用对泡沫材料的拉伸强度的提高具有协同作用。 展开更多
关键词 聚乙烯 泡沫材料 介电常数 空心玻璃微球 乙烯-醋酸乙烯酯共聚物
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氢氧化镁/可膨胀石墨/聚丙烯复合材料的热降解过程与燃烧行为 被引量:9
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作者 张立飞 柳军旺 +2 位作者 马成国 王永亮 韩志东 《华南师范大学学报(自然科学版)》 CAS 北大核心 2020年第1期17-22,共6页
以可膨胀石墨(EG)和氢氧化镁(MH)为无卤阻燃剂,通过熔融共混法制备了无卤阻燃聚丙烯(PP)复合材料(EG/PP、MH/PP和MH/EG/PP),采用热重法研究了复合材料的热降解过程,以氧指数(LOI)和垂直燃烧(UL-94)评价研究了复合材料的阻燃性能,采用锥... 以可膨胀石墨(EG)和氢氧化镁(MH)为无卤阻燃剂,通过熔融共混法制备了无卤阻燃聚丙烯(PP)复合材料(EG/PP、MH/PP和MH/EG/PP),采用热重法研究了复合材料的热降解过程,以氧指数(LOI)和垂直燃烧(UL-94)评价研究了复合材料的阻燃性能,采用锥形量热仪研究了复合材料的燃烧行为.结果表明:MH和EG间存在显著的协同阻燃作用,在阻燃剂质量分数为60%时,MH与EG质量比为5∶1的MH/EG/PP材料其氧指数可以达到29.7,与MH/PP复合材料相比提高了11.2%;EG与MH协同具有良好的降低热释放作用,与PP和MH/PP相比,MH/EG/PP复合材料的热释放速率峰值(peak-HRR)分别降低了73.9%和34.2%;EG和MH的协同作用大幅度降低了MH/EG/PP的质量损失速率;结合残炭的形貌结果,揭示了EG和MH协同阻燃机理的关键在于增强了炭层的隔热和隔氧作用. 展开更多
关键词 聚丙烯 可膨胀石墨 氢氧化镁 阻燃性能 热降解
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基于新课程改革背景下教师课堂教学行为转变探析 被引量:2
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作者 刘均望 《科教文汇》 2018年第23期112-113,共2页
在新课程改革中,教师的课堂教学行为是至关重要的。这一次课程改革其主要的落脚点是在日常的教师教学的过程当中切实将新课程理念以及课程教学研究者的思想贯穿到日常的教学行为中,所以,从这一点来看教师日常的教学行为是否能够有效、... 在新课程改革中,教师的课堂教学行为是至关重要的。这一次课程改革其主要的落脚点是在日常的教师教学的过程当中切实将新课程理念以及课程教学研究者的思想贯穿到日常的教学行为中,所以,从这一点来看教师日常的教学行为是否能够有效、科学直接关乎这次课程改革的科学性与效果性。在今后的教师教学中,只有从教师的课堂行为出发,在科学理论的指导下,进一步的进行课堂教学行为的转变与优化,从而实现预定的课堂教学目标。 展开更多
关键词 新课程 课堂教学行为 行为转变
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改良弹力宽胶布在经鼻气管插管慢性阻塞性肺疾病急性加重期患者中的应用 被引量:1
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作者 陈慧莉 刘俊旺 《中国临床护理》 2020年第2期123-125,共3页
目的探讨改良弹力宽胶布在经鼻气管插管慢性阻塞性肺疾病急性加重期患者中的应用效果。方法将120例经鼻气管插管的慢性阻塞性肺疾病患者随机分为对照组及观察组,每组各60例,对照组采用传统胶布环绕式固定,观察组采用改良弹力宽胶布固定... 目的探讨改良弹力宽胶布在经鼻气管插管慢性阻塞性肺疾病急性加重期患者中的应用效果。方法将120例经鼻气管插管的慢性阻塞性肺疾病患者随机分为对照组及观察组,每组各60例,对照组采用传统胶布环绕式固定,观察组采用改良弹力宽胶布固定。比较2组气管插管固定效果、皮肤黏膜损伤、患者舒适度、固定带更换时间。结果观察组气管插管固定情况、患者舒适度均好于对照组(Z=-3.489,P<0.001;Z=-3.399,P=0.001),皮肤黏膜损伤情况轻于对照组(Z=-3.159,P=0.002),固定带更换时间长于对照组(t=19.265,P<0.001)。结论弹力宽胶布固定气管插管牢靠安全、不易脱出,皮肤黏膜损伤情况减少,患者舒适度提高,固定带更换次数少,护理工作量减轻,值得在临床进一步开展。 展开更多
关键词 弹力宽胶布 经鼻气管插管 固定方法 慢性阻塞性肺疾病
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Chinese Environmental Protection NGOs Visit Laos and Cambodia
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作者 liu junwang 《International Understanding》 2018年第4期63-63,共1页
From September 25 to 30,China Ecological Civilization Research and Promotion Association (CECRPA) visited Laos and Cambodia with 8 environmental protection NGOs,enterprises and institutions,including All-China Environ... From September 25 to 30,China Ecological Civilization Research and Promotion Association (CECRPA) visited Laos and Cambodia with 8 environmental protection NGOs,enterprises and institutions,including All-China Environment Federation,Sino-Japan Friendship Center for Environmental Protection,Chinese Academy of Environmental Planning and Policy Research Center for Environm ent and Economy,for presentations and exchanges on environmental policy and technology to lend impetus to the building of a green "Belt and Road". 展开更多
关键词 CHINESE ENVIRONMENTAL PROTECTION NGOS Laos Cambodia
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Security Building of the Belt and Road and Role of Political Parties and Social Organizations——Keynote Address at the 2018 International Forum on Emergency Management and Safety Development of the Belt and Road
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作者 Wang Yajun liu junwang 《International Understanding》 2018年第4期18-23,共6页
The 2018 International Conference on Emergency Management and Safety Development of the Belt and Road co-organized by the Party School of the CPC Central Committee(National Academy of Governance),the International Dep... The 2018 International Conference on Emergency Management and Safety Development of the Belt and Road co-organized by the Party School of the CPC Central Committee(National Academy of Governance),the International Department of the CPC Central Committee,the Ministry of Public Security,the National Health Commission,the Ministry of Emergency Management,the State-owned Assets Supervision and Administration Commission of the State Council was held on December 6,2018.More than 200 government officials,experts,scholars and emergency management workers from nearly 30 countries and relevant international organizations attended the conference.Shang Yong,Vice Minister of Emergency Management,Wang Yajun,Vice Minister of the International Department of the CPC Central Committee(IDCPC),Li Ji,Vice President of the Party School of the CPC Central Committee(National Academy of Governance),Liu Yuejin,Member of the Party Committee of the Ministry of Public Security and Counter-Terrorism Commissioner,Xu Fushun,Deputy Director of the State-owned Assets Supervision and Administration Commission of the State Council and other officials in charge of the conference’s co-organizers and Hugo Slim,Director of the ICRC’s Political Research Office,Nicholas Rosellini,United Nations Coordinator in China,Khalid Abdullah Mansuri,Director of the International Division of the International Association of Emergency Managers and Director of the Emergency Management Department of the National Senior Security Council of the United Arab Emirates and other guests of honors delivered keynote speeches.An excerpt of the keynote speech by Wang Yajun,Vice Minister of the IDCPC is now published. 展开更多
关键词 the BELT and ROAD SECURITY BUILDING
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Chinese Civil Society Representatives Attend 2020 C20 Summit
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作者 Huang Sen liu junwang 《International Understanding》 2020年第3期63-64,共2页
From October 6 to 10,representatives of Chinese civil society organizations(CSOs)attended the 2020 C20 Summit.Due to the COVID-19 pandemic,this conference was held online.Organized by the King Khalid Foundation,the Su... From October 6 to 10,representatives of Chinese civil society organizations(CSOs)attended the 2020 C20 Summit.Due to the COVID-19 pandemic,this conference was held online.Organized by the King Khalid Foundation,the Summit was themed on “Let Our Voices Be Heard”and focused on five major topics including COVID-19 response。 展开更多
关键词 SUMMIT attended CIVIL
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International Exchanges
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作者 liu junwang 《International Understanding》 2018年第4期64-72,共9页
The Third BRIDGE for Cities-Belt and Road Initiative:Developing Green Economies for Cities was held on October 8th in Vienna,the capital of Austria.Liu Hongru,Deputy Secretary General of China Federation of Industrial... The Third BRIDGE for Cities-Belt and Road Initiative:Developing Green Economies for Cities was held on October 8th in Vienna,the capital of Austria.Liu Hongru,Deputy Secretary General of China Federation of Industrial Economics (CFIE),on behalf of Xiong Meng,Executive Vice-Chairman and Secretary General of CFIE was invited to attend the conference.Multilateral exchanges and in-depth discussions were carried out on how to achieve sustainable industrial development in urban area,and how to promote economic development,infrastructure construction and community development in a virtuous circle. 展开更多
关键词 INDUSTRIAL DEVELOPMENT ECONOMIC DEVELOPMENT
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