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Who In flue nces the Asian-Pacific Real Estate Markets:The US,Japan or China?

China & World Economy 2019年第6期27卷 50-78页

作者： kim hiang liow Yuting Huang Jeongseop Song Department of Real Estate National University of SingaporeSingapore International School of Economics and Management Capital University of Economics and BusinessChina

As rapid economic growth in China has led to significant appreciation of urban real estate market values,this study examines China s influence on Asian-Pacific real estate markets by focusing on their respective market integration with the US,Japan and China during the period January 2005 to December 2017.Market integration is examined by unconditional and time-varying conditional correlations,nonlinear Granger causality and dynamic connectedness effects.Overall,although the US and Japanese real estate markets have significantly influenced return and volatility in the regional markets,China has emerged as another major regional real estate volatility leader with rising influence over volatility integration,especially during the 2007-2011 crisis period.Financial crises have strengthened China s volatility connectedness effects and market integration with other Asian-Pacific real estate markets.Our results imply that the benefits of regional portfolio diversification may be declining as volatility integration across the Chinese and Asian-Pacific real estate markets becomes stronger.Therefore,diversified global investors should pay greater attention to these real estate markets.

关键词： Asian-Pacific orthogonal real estate markets correlation dynamic connectedness market integration nonlinear causality

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Scalable synthesis of nanoporous silicon microparticles for highly cyclable lithium-ion batteries

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Nano Research 2020年第6期13卷 1558-1563页

作者： Jiangyan Wang William Huang Yong Seok kim You Kyeong Jeong Sang Cheol kim Jeffrey Heo hiang Kwee Lee Bofei Liu Jaehou Nah Yi Cui Department of Materials Science and Engineering Stanford UniversityStanfordCalifornia94305USA Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory2575 Sand Hill RoadMenlo ParkCalifornia94025USA R&D center Samsung SDI130Samsung-roYeongtong-guSuwon-siGyeonggi-do16678Republic of Korea

Nanoporous silicon is a promising anode material for high energy density batteries due to its high cycling stability and high tap density compared to other nanostructured anode materials.However,the high cost of synthesis and low yield of nanoporous silicon limit its practical application.Here,we develop a scalable,low-cost top-down process of controlled oxidation of Mg2Si in the air,followed by HCl removal of MgO to generate nanoporous silicon without the use of HF.By controlling the synthesis conditions,the oxygen content,grain size and yield of the porous silicon are simultaneously optimized from commercial standpoints.In situ environmental transmission electron microscopy reveals the reaction mechanism;the Mg2Si microparticle reacts with O2 to form MgO and Si,while preventing SiO2 formation.Owing to the low oxygen content and microscale secondary structure,the nanoporous silicon delivers a higher initial reversible capacity and initial Coulombic efficiency compared to commercial Si nanoparticles(3,033 mAh/g vs.2,418 mAh/g,84.3%vs.73.1%).Synthesis is highly scalable,and a yield of 90.4%is achieved for the porous Si nanostructure with the capability to make an excess of 10 g per batch.Our synthetic nanoporous silicon is promising for practical applications in next generation lithium-ion batteries.

关键词： silicon anode nanoporous microparticle yield lithium-ion battery Coulombic efficiency

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