期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
三聚氰胺氰脲酸阻燃尼龙66热降解行为及动力学 被引量:9
1
作者 罗典 范敬辉 +1 位作者 黄浩 刘渊 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2019年第6期35-39,共5页
在对三聚氰胺氰脲酸(MCA)阻燃尼龙66(PA66)热降解及热释放行为分析基础上,采用包括Kissinger和Horowitz-Metzger2种数学模型对其热降解动力学进行研究,通过热重分析(TG)、微型燃烧量热(MCC)揭示MCA与PA66的相互作用机理。结果表明,尽管... 在对三聚氰胺氰脲酸(MCA)阻燃尼龙66(PA66)热降解及热释放行为分析基础上,采用包括Kissinger和Horowitz-Metzger2种数学模型对其热降解动力学进行研究,通过热重分析(TG)、微型燃烧量热(MCC)揭示MCA与PA66的相互作用机理。结果表明,尽管不同数学模型获得的热降解活化能数值有较大差异,但MCA阻燃PA66与纯PA66相比均表现出前者活化能明显下降,由于MCA分解的三嗪化合物可与尼龙分子链氢键网络发生作用改变其电子云密度,促进其α和β-断链而形成低聚物及低分子挥发物,因此MCA会导致PA66分解温度前移,使其呈现两阶热分解特征。 展开更多
关键词 三聚氰胺氰脲酸 阻燃剂 尼龙66 热分解动力学模型
下载PDF
通过与钌合金化来调控铂的电子结构促进以水为质子源的光催化选择性加氢
2
作者 施曼曼 罗点 +6 位作者 吴鹏 沈娅蓉 魏杰顶 郭赛雅 陆洲 黄玉成 倪永红 《Science China Materials》 SCIE EI CAS CSCD 2024年第3期824-832,共9页
调控金属活性位点的电子结构来发展高活性的选择性加氢反应催化剂对于可持续有机合成非常重要.但时至今日,这仍然是非常具有挑战性的课题.在本文中,我们将具有电子结构调节特性的超细PtRu合金纳米颗粒负载在CdS纳米棒上,成功构建了PtRu/... 调控金属活性位点的电子结构来发展高活性的选择性加氢反应催化剂对于可持续有机合成非常重要.但时至今日,这仍然是非常具有挑战性的课题.在本文中,我们将具有电子结构调节特性的超细PtRu合金纳米颗粒负载在CdS纳米棒上,成功构建了PtRu/CdS复合催化剂并研究了其光催化芳香族硝基化合物氢化还原性能.我们发现当以水为质子源时,所得复合催化剂表现出高效的光催化加氢活性.超快光谱研究和密度泛函理论计算揭示了合金的形成促进了光生载流子的分离并降低了氢化还原反应中决速步的能垒,从而显著提高了加氢活性.本研究通过合金化效应调节助催化剂的电子结构,为高活性助催化剂/光催化剂体系的理性设计开辟了一条新途径. 展开更多
关键词 electronic modulation ALLOYING carrier dynamics PHOTOCATALYSIS nitroaromatic hydrogenation
原文传递
A new species of Bostrychus (Gobiiformes: Eleotridae) from the East China Sea
3
作者 Rong-Rong Zhang Kuan Yang +1 位作者 dian luo Shao-Xiong Ding 《Zoological Research(Diversity and Conservation)》 2024年第1期82-85,共4页
DEAR EDITOR,Bostrychus,a genus in the family Eleotridae of the order Gobiiformes,was first established by Lacepède in 1801(Buffon,1801).Bostrychus currently contains seven recognized species,including two recent ... DEAR EDITOR,Bostrychus,a genus in the family Eleotridae of the order Gobiiformes,was first established by Lacepède in 1801(Buffon,1801).Bostrychus currently contains seven recognized species,including two recent additions(B.microphthalmos and B.scalaris)described in 2005(Hoese&Kottelat,2005)and 2008(Larson,2008),respectively.The natural range of Bostrychus species extends from East Asia to Australia,with the exception of B.africanus,Steindachner,1879,which is distributed in West Africa(Herre,1946).Among the recognized species,B.sinensis,B.zonatus,and B.africanus are relatively widespread,inhabiting diverse areas from estuaries to freshwater streams,while B.scalaris is only found at a single mangrove site in the Selangor State of Malaysia(Larson,2008).The remaining three species exhibit a high degree of habitat specialization and are highly localized(Hoese&Kottelat,2005):B.microphthalmos inhabits a cave stream in the Maros karst of southern Sulawesi,B.aruensis is confined to freshwater environments in the Aru Islands of Indonesia,and B.strigogenys is found only in freshwater areas in southern Papua New Guinea and Irian Jaya. 展开更多
关键词 East karst environments
下载PDF
A Human Active Lower Limb Model for Chinese Pedestrian Safety Evaluation 被引量:2
4
作者 Fuhao Mo dian luo +3 位作者 Zheng Tan Bo Shang Xiaojiang Lv Donghua Zhou 《Journal of Bionic Engineering》 SCIE EI CSCD 2021年第4期872-886,共15页
A subsystem impactor test for pedestrian lower limb injury evaluation has been brought in China New Car Assessment Protocol(CNCAP).Concerning large anthropometric differences of the people from different countries,the... A subsystem impactor test for pedestrian lower limb injury evaluation has been brought in China New Car Assessment Protocol(CNCAP).Concerning large anthropometric differences of the people from different countries,the present study aims to establish and validate a finite element lower limb model representing 50th Chinese male size for pedestrian safety research,then compare its biomechanical responses with the general models currently in wide use in the world for pedestrian safety evaluation.Concerning the vehicle-pedestrian impact loading environment,the previously developed lower limb model with three-dimensional muscles was adjusted and validated through the related experiments.Then,the biomechanical responses of the validated model were compared with the Total Human Model for Safety(THUMS)and Advanced Pedestrian Legform Impactor(aPLI)models by combing with four typical vehicles.The results showed that both consistency and significant differences of biomechanical responses existed between the present model and the other two models.The injury measurements of the thigh region of the present model showed extremely large differences with the other two models,while the tibia and Medial Collateral Ligament(MCL)injury measurements show similar values.Thus,it can be concluded that directly using the aPLI or THUMS models for Chinese pedestrian safety evaluation is not robust concerning both kinematic responses and injury measurements. 展开更多
关键词 lower limb injury biomechanics human body modeling pedestrian safety finite element analysis
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部