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Non-Gaussianity of Racetrack Inflation Models

Communications in Theoretical physics 2007年第7期48卷 189-192页

作者： sun cheng-yit zhang de-hai department of physics,the graduate school of the chinese academy of sciences,beijing 100049,china department of physics The Graduate School of The Chinese Academy of Sciences Beijing 100049 China

In this paper,we use the result in[*** and ***,arXiv:astro-ph/0510709]to calculate thenon-Gaussianity of the racetrack models in[***-Pillado,et al.,JHEP 0411(2004)063;arXiv:hep-th/0406230]and[***-Pillado,et al.,arXiv:hep-th/0603129].The two models give different *** of themare ***,we find that,for multi-field inflationary models with the non-trivial metric of the field space,the condition of the slow-roll cannot guarantee small non-Gaussianities.

关键词： non-Gaussianity non-linear parameter racetrack inflation

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Engineering membrane electrode assembly for advanced polymer electrolyte water electrolyzer

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Science china Materials 2022年第12期65卷 3243-3272页

作者： Heming Liu Xin Kang Taifeng Zhao Zhiyuan zhang Shiyu Ge Shuqi Hu Yuting Luo Fengning Yang Shao-hai Li chenghua sun Qiangmin Yu Hui-Ming cheng Bilu Liu Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute&Institute of Materials ResearchShenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China department of Electrical and Computer Engineering University of Toronto35 St.George St.TorontoOntario M5S 1A4Canada department of physics University of OxfordClarendon LaboratoryParks RoadOxfordOX13PUUK department of Chemistry and Biotechnology and Center for Translational AtomaterialsSwinburne University of TechnologyHawthornVIC 3122Australia Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Faculty of Materials Science and Engineering Institute of Technology for Carbon NeutralityShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

As an important energy carrier in terms of carbon neutrality,green hydrogen produced by water electrolysis using renewable electricity has attracted worldwide *** polymer electrolyte water electrolyzer(PEWE)has the potential to be a mainstay in the green hydrogen market in the future because of its superior ***,the development of PEWE is constrained by the slow progress of the membrane electrode assembly(MEA),which is an essential component of PEWE and largely determines the cost and performance of the ***,the MEA must be optimized from the aspects of reducing cost and improving performance to promote the development of *** this review,we first discuss the recent progress of the materials and design strategies of MEA,including the cost,activity,and stability of catalysts,distribution and thickness of ionomers,and ion transport efficiency of ion exchange membranes(IEMs).Then,the effects of all components and interlayer interfaces on the ions,electrons,and mass transfer in MEA and,consequently,the performance of PEWE are ***,we propose perspectives on developing MEA by optimizing the catalyst activity and stability of IEM,interface contact between adjacent components,and evaluation methods of performance.

关键词： water electrolysis polymer electrolyte water electrolyser membrane electrolyte assembly electrocatalyst

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