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transition pathways in Cylinder-Gyroid interface

Communications in Computational Physics 2022年第8期32卷 810-828页

作者： Xiaomei Yao Jie Xu Lei Zhang Beijing International Center for Mathematical Research Peking UniversityBeijing 100871China LSEC&NCMIS Institute of Computational Mathematics and Scientific/Engineering Computing(ICMSEC)Academy of Mathematics and Systems Science(AMSS)Chinese Academy of SciencesBeijingChina

When two distinct ordered phases contact,the interface may exhibit rich and fascinating structures.Focusing on the Cylinder-Gyroid interface system,transition pathways connecting various interface morphologies are studied armed with the Landau–Brazovskii model.Specifically,minimum energy paths are obtained by computing transition states with the saddle dynamics.We present four primary transition pathways connecting different local minima,representing four different mechanisms of the formation of the Cylinder-Gyroid interface.The connection of Cylinder and Gyroid can be either direct or indirect via Fddd with three different orientations.Under different displacements,each of the four pathways may have the lowest energy.

关键词： Landau-Brazovskii model Cylinder-Gyroid interface saddle dynamics transition state transition pathway

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Towards carbon neutrality:A study on China's long-term low-carbon transition pathways and strategies

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Environmental Science and Ecotechnology 2022年第1期9卷 1-9页

作者： Jiankun He Zheng Li Xiliang Zhang Hailin Wang Wenjuan Dong Ershun Du Shiyan Chang Xunmin Ou Siyue Guo Zhiyu Tian Alun Gu Fei Teng Bin Hu Xiu Yang Siyuan Chen Mingtao Yao Zhiyi Yuan Li Zhou Xiaofan Zhao Ying Li Danwei Zhang Institute of Climate Change and Sustainable Development Tsinghua UniversityBeijing100084China Department of Energy and Power Engineering Tsinghua UniversityBeijing100084China Institute of Energy Environment and EconomyTsinghua UniversityBeijing100084China Laboratory of Low Carbon Energy Tsinghua UniversityBeijing100084China Energy Research Institute Chinese Academy of Macroeconomic ResearchBeijing100038China Division of Public Policy Hong Kong University of Science and TechnologyHong KongChina

As the world's biggest carbon dioxide(CO_(2))emitter and the largest developing country,China faces daunting challenges to peak its emissions before 2030 and achieve carbon neutrality within 40 years.This study fully considered the carbon-neutrality goal and the temperature rise constraints required by the Paris Agreement,by developing six long-term development scenarios,and conducting a quantitative evaluation on the carbon emissions pathways,energy transformation,technology,policy and investment demand for each scenario.This study combined both bottom-up and top-down methodologies,including simulations and analyses of energy consumption of end-use and power sectors(bottom-up),as well as scenario analysis,investment demand and technology evaluation at the macro level(top-down).This study demonstrates that achieving carbon neutrality before 2060 translates to significant efforts and overwhelming challenges for China.To comply with the target,a high rate of an average annual reduction of CO_(2) emissions by 9.3%from 2030 to 2050 is a necessity,which requires a huge investment demand.For example,in the 1.5℃ scenario,an investment in energy infrastructure alone equivalent to 2.6%of that year's GDP will be necessary.The technological pathway towards carbon neutrality will rely highly on both conventional emission reduction technologies and breakthrough technologies.China needs to balance a long-term development strategy of lower greenhouse gas emissions that meets both the Paris Agreement and the long-term goals for domestic economic and social development,with a phased implementation for both its five-year and long-term plans.

关键词： China Carbon neutrality The paris agreement transition pathway Strategy

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