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Shock temperature and reflectivity of precompressed H2O up to 350 GPa:Approaching the interior of planets

Chinese Physics B 2018年第12期27卷 405-412页

作者： Zhi-Yu He Hua Shu Xiu-Guang Huang Qi-Li Zhang Guo Jia Fan Zhang Yu-Chun Tu Jun-Yue Wang Jun-Jian Ye Zhi-Yong Xie Zhi-Heng Fang Wen-Bing Pei Si-Zu Fu Shanghai Institute of Laser Plasma CAER P.O.Box 800-229Shanghai201800China IFSA Collaborative Innovation Center Shanghai Jiaotong UniversityShanghai 200240China Institute of Applied Physics and Computational Mathematics Beijing 100088China Center for High Pressure Science and Technology Advance Research Beijing 100094China

Using a combination of static precompression and laser-driven shock compression, shock temperature and reflectivity of H2O have been measured up to 350 GPa and 2.1×10~4 K. Here, two calibration standards were applied to enhance temperature measurement reliability. Additionally, in temperature calculations, the discrepancy in reflectivity between active probe beam wavelength and self-emission wavelength has been taken into account to improve the data’s *** water’s temperature–pressure data are in very good agreement with our quantum molecular dynamics model,suggesting a superionic conductor of H2O in the icy planets’ deep interior. A sluggish slope gradually approaching Dulong–Petit limit at high temperature was found at a specific heat capacity. Also, high reflectivity and conductivity were observed at the same state. By analyzing the temperature–pressure diagram, reflectivity, conductivity and specific heat comprehensively at conditions simulating the interior of planets in this work, we found that as the pressure rises, a change in ionization appears; it is supposedly attributed to energetics of bond-breaking in the H2O as it transforms from a bonded molecular fluid to an ionic state. Such molecular dissociation in H2O is associated with the conducting transition because the dissociated hydrogen atoms contribute to electrical properties.

关键词： high temperature measurement equation of state of water laser-driven shock diamond anvil cell

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Integrated Futures for Europe’s Mountain Regions: Reconciling Biodiversity Conservation and Human Livelihoods

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Journal of Mountain Science 2006年第4期3卷 276-286页

作者： Jonathan Mitchley Martin F.Price Joseph Tzanopoulos Imperial College London Wye campus High Street Wye Ashford Kent TN25 5AH UK The Centre for Mountain Studies Perth College UHI Millennium Institute Crieff Road Perth PH1 2NX UK caer The University of Reading Earley Gate PO Box 237 Reading RG6 6AR UK

Europe＇s mountains cover nearly half of the continent＇s area and are home to one fifth of the European population. Mountain areas are hotspots of biodiversity and agriculture has played a multifunctional role in defining and sustaining mountain biodiversity. Ongoing trends of agricultural decline are having negative impacts on mountain biodiversity. This paper presents results from an interdisciplinary European research project, BioScene, which investigated the relationship between agriculture and biodiversity in six mountain study areas across Europe to provide recommendations for reconciling biodiversity conservation with social and economic activities through an integrated rural development strategy. BioScene used scenario analysis and stakeholder participation as tools for structuring the analysis of alternative mountain futures. Three main BioScene scenarios were evaluated： Business as Usual （BAIT）, Agricultural Liberalisation （Lib）, Managed Change for Biodiversity （MCB）. BioScene brought together ecologists, economists, sociologists and rural geogra- phers, to carry out interdisciplinary analysis of the scenarios： identifying key drivers of change, assessing the biodiversity consequences and evaluating costeffectiveness. BioScene used a sustainability assessment to integrate the research outputs across natural and social science disciplines to assess the broader sustainability of the scenarios in terms of biodiversity, natural resources, rural development, social development, economic development and institutional capacity. The sustainability assessment showed that the MCB scenario was potentially the most sustainable of the three BioScene scenarios. Through the reconciliation of potentially conflicting objectives, such as conservation, economic development and human livelihoods, and with a strong participatory planning approach, the MCB scenario could represent an alternative approach to BaU for sustainable rural development in Europe＇s mountains. BioScene co

关键词： Agriculture interdisciplinary research scenarios stakeholder participation sustainability assessment

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Growth and transport properties of topological insulator Bi2Se3 thin film on a ferromagnetic insulating substrate

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Chinese Physics B 2018年第7期27卷 431-437页

作者： Shanna Zhu Gang Shi Peng Zhao Dechao Meng Genhao Liang Xiaofang Zhai Yalin Lu Yongqing Li Lan Chen Kehui Wu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Microsystem and Terahertz Research Center ＆ Institute of Electronic Engineering CAER Mianyang 621900China Synergy Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Quantum Matter.Beijing 100871 China

Exchange coupling between topological insulator and ferromagnetic insulator through proximity effect is strongly attractive for both fundamental physics and technological applications. Here we report a comprehensive investigation on the growth behaviors of prototype topological insulator Bi2Se3 thin film on a single-crystalline LaCoO3 thin film on SrTiO3 substrate, which is a strain-induced ferromagnetic insulator. Different from the growth on other substrates, the Bi2Se3 films with highest quality on LaCoO3 favor a relatively low substrate temperature during growth. As a result, an inverse dependence of carrier mobility with the substrate temperature is found. Moreover, the magnetoresistance and coherence length of weak antilocalization also have a similar inverse dependence with the substrate temperature, as revealed by the magnetotransport measurements. Our experiments elucidate the special behaviors in Bi2Se3/LaCoO3 heterostructures, which provide a good platform for exploring related novel quantum phenomena, and are inspiring for device applications.

关键词： topological insulator ferromagnetic insulator molecular beam epitaxy magnetotransport proper-ties

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