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Mollisols Properties and Changes in Ukraine and China

Chinese Geographical science 2011年第3期21卷 257-266页

作者： yuri s kravchenko ZHANG Xingyi LIU Xiaobing sONG Chunyu Richard M CRUsE Key Laboratory of Mollisols Agroecology Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Harbin 150081 China National University of Life and Environmental sciences of Ukraine Kyiv 03041 Ukraine Department of Agronomy Iowa State University Ames 500011 IA USA

soils are the foundation of civilizations and the basis for human food *** in Ukraine and Northeast China are two out of the four major Mollisol regions in the *** natural areas from which Mollisols developed are the prairies and steppes that experience temperate and freezing *** review paper introduces the general climate,vegetation,and topography of Mollisols regions in Ukraine and Northeast China,analyzes their properties,including soil texture,soil organic matter content,soil bulk density,pH,cation exchange capacity and other chemical properties,and compares the property changes and management practices of Mollisols in relation to sustainable grain production.

关键词： Mollisols soil properties soil organic matter tillage Mollisols management

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Topology-empowered membrane devices for terahertz photonics

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Advanced Photonics 2022年第4期4卷 29-37页

作者： Quanlong Yang Dongyang Wang sergey Kruk Mingkai Liu Ivan kravchenko Jiaguang Han yuri Kivshar Ilya shadrivov Australian National University Nonlinear Physics CentreResearch School of PhysicsCanberra ActonAustralia Central south University School of Physics and ElectronicsChangshaChina The Hong Kong University of science and Technology Department of PhysicsHong KongChina Center for Nanophase Materials sciences Oak Ridge National LaboratoryOak RidgeTennesseeUnited States Tianjin University Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringTianjinChina

Control of terahertz waves offers a profound platform for next-generation sensing,imaging,and information ***,all conventional terahertz components and systems suffer from bulky design,sensitivity to imperfections,and transmission *** propose and experimentally demonstrate onchip integration and miniaturization of topological devices,which may address many existing drawbacks of the terahertz *** design and fabricate topological devices based on valley-Hall photonic structures that can be employed for various integrated components of on-chip terahertz *** demonstrate valleylocked asymmetric energy flow and mode conversion with topological waveguide,multiport couplers,wave division,and whispering gallery mode *** devices are based on topological membrane metasurfaces,which are of great importance for developing on-chip photonics and bring many features into terahertz technology.

关键词： topological devices terahertz photonics membrane on-chip

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