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Molecular design for enhanced spin transport in molecular semiconductors

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Nano Research 2023年第12期16卷 13457-13473页

作者： tingting yang yang Qin Xianrong Gu Xiangnan Sun Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Molecular semiconductors(MSCs),characterized by a longer spin lifetime than most of other materials due to their weak spin relaxation mechanisms,especially at room temperature,together with their abundant chemical tailorability and flexibility,are regarded as promising candidates for spintronic *** spintronics,as an emerging subject that utilizes the unique properties of MSCs to study spin-dependent phenomena and properties,has attracted wide *** molecular spintronic devices,MSCs play the role as medium for information transport,process,and storage,in which the efficient spin inject–transport process is the ***,we focus mainly on summarizing and discussing the recent advances in theoretical principles towards spin transport of MSCs in terms of the injection of spin-polarized carriers through the ferromagnetic metal/MSC interface and the subsequent transport within the MSC *** on the theoretical progress,we cautiously present targeted design strategies of MSCs that contribute to the optimization of spin-transport efficiency and give favorable approaches to exploring accessional possibilities of spintronic ***,challenges and prospects regarding current spin transport are also presented,aiming to promote the development and application of the rosy and energetic field of molecular spintronics.

关键词： molecular spintronics molecular semiconductors spin transport spin injection molecular design

Robust dynamic output feedback control for switched polytopic systems under asynchronous switching

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Chinese Journal of Aeronautics 2015年第4期28卷 1226-1235页

作者： yang tingting Li Aijun Niu Erzhuo School of Automation Northwestern Polytechnical University

The robust controller design problem for switched polytopic systems under asynchronous switching is *** systems exist in many aviation applications, such as dynamical systems involving rapid variations.A switched polytopic system is established to describe the highly maneuverable technology vehicle within the full flight envelope and a robust dynamic output feedback control method is designed for the switched polytopic *** the Lyapunov-like function method and the average dwell time method, a sufficient condition is derived for the switched polytopic system with asynchronous switching and data dropout to be globally,uniformly and asymptotically stable in terms of linear matrix *** robust dynamic output feedback controller is then applied to the highly maneuverable technology vehicle to illustrate the effectiveness of the proposed *** simulation results show that the angle of attack tracking performance is acceptable over the time history and the control surface responses are all satisfying along the full flight trajectory.

关键词： Asynchronous switching Average dwell time Highly maneuverable technology vehicle Lyapunov-like function Switched polytopic Systems

Simulation and future projection of the mixed layer depth and subduction process in the subtropical Southeast Pacific

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Acta Oceanologica Sinica 2021年第12期40卷 104-113页

作者： Ruibin Xia Yijun He tingting yang School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China MNR Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Meteorological Disaster Ministry of EducationNanjing 210044China Joint International Research Laboratory of Climate and Environment Change Nanjing 210044China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing 210044China Nanjing Joint Institute for Atmospheric Sciences Nanjing 210008China

The present climate simulation and future projection of the mixed layer depth(MLD)and subduction process in the subtropical Southeast Pacific are investigated based on the geophysical fluid dynamics laboratory earth system model(GFDL-ESM2 M).The MLD deepens from May and reaches its maximum(>160 m)near(24°S,104°W)in September in the historical *** MLD spatial pattern in September is non-uniform in the present climate,which shows three characteristics:(1)the deep MLD extends from the Southeast Pacific to the West Pacific and leads to a"deep tongue"until 135°W;(2)the northern boundary of the MLD maximum is smoothly near 18°S,and MLD shallows sharply to the northeast;(3)there is a relatively shallow MLD zone inserted into the MLD maximum eastern boundary near(26°S,80°W)as a weak"shallow tongue".The MLD nonuniform spatial pattern generates three strong MLD fronts respectively in the three key regions,promoting the subduction *** global warming,the variability of MLD spatial patterns is remarkably diverse,rather than deepening *** all the key regions,the MLD deepens in the south but shoals in the north,strengthing the MLD *** a result,the subduction rate enhances in these *** MLD antisymmetric variability is mainly influenced by various factors,especially the potential-density horizontal advection non-uniform *** that the freshwater flux change helps to deepen the MLD uniformly in the whole basin,so it hardly works on the regional MLD *** study highlights that there are regional differences in the mechanisms of the MLD change,and the MLD front change caused by MLD non-uniform variability is the crucial factor in the subduction response to global warming.

关键词： mixed layer depth mixed layer depth front subduction ocean potential-density advection

Research on the Application of Super Resolution Reconstruction Algorithm for Underwater Image

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Computers, Materials & Continua 2020年第3期62卷 1249-1258页

作者： tingting yang Shuwen Jia Hao Ma University of Sanya Sanya572000China 1455 Boulevard de Maisonneuve O MontréalQC H3G 1M8Canada

Underwater imaging is widely used in ocean,river and lake exploration,but it is affected by properties of water and the *** order to solve the lower-resolution underwater image formed by the influence of water and light,the image super-resolution reconstruction technique is applied to the underwater image *** paper addresses the problem of generating super-resolution underwater images by convolutional neural network framework *** research the degradation model of underwater images,and analyze the lower-resolution factors of underwater images in different situations,and compare different traditional super-resolution image reconstruction *** further show that the algorithm of super-resolution using deep convolution networks(SRCNN)which applied to super-resolution underwater images achieves good results.

关键词： Underwater image image super-resolution algorithm algorithm reconstruction degradation model

A new method to retrieve salinity profiles from sea surface salinity observed by SMOS satellite

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Acta Oceanologica Sinica 2015年第9期34卷 85-93页

作者： yang tingting CHEN Zhongbiao HE Yijun School of Marine Sciences Nanjing University of Information Science and Technology

This paper proposes a new method to retrieve salinity profiles from the sea surface salinity （SSS） observed by the Soil Moisture and Ocean Salinity （SMOS） satellite. The main vertical patterns of the salinity profiles are firstly extracted from the salinity profiles measured by Argo using the empirical orthogonal function. To determine the time coefficients for each vertical pattern, two statistical models are developed. In the linear model, a transfer function is proposed to relate the SSS observed by SMOS （SMOS_SSS） with that measured by Argo, and then a linear relationship between the SMOS_SSS and the time coefficient is established. In the nonlinear model, the neural network is utilized to estimate the time coefficients from SMOS_SSS, months and positions of the salinity profiles. The two models are validated by comparing the salinity profiles retrieved from SMOS with those measured by Argo and the climatological salinities. The root-mean-square error （RMSE） of the linear and nonlinear model are 0.08-0.16 and 0.08-0.14 for the upper 400 m, which are 0.01-0.07 and 0.01-0.09 smaller than the RMSE of climatology. The error sources of the method are also discussed.

关键词： salinity profile Soil Moisture and Ocean Salinity (SMOS) data Argo data sea surface salinity

Cathode host engineering for non-lithium(Na,K and Mg)sulfur/selenium batteries:A state-of-the-art review

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Nano Materials Science 2023年第2期5卷 119-140页

作者： tingting yang Yubin Niu Qi Liu Maowen Xu Institute for Clean Energy&Advanced Materials Faculty of Materials and EnergySouthwest UniversityChongqing400715PR China Department of Physics City University of Hong KongHong Kong999077China

Sulfur and selenium have been paid more and more attention in energy storage systems because of their high theoretical specific gravimetric and volumetric *** the increasing scarcity of lithium resources,secondary batteries made of sulfur and selenium coupled with other alkali metal/alkaline earth metals(***,K,Mg)are expected to play a vital role in future production and human *** to the volume expansion,poor conductivity and shuttle effect,the structure design of cathode,as one of the important roles in metal-S/Se batteries,has always been a hot and difficult *** the review,various host materials of S and Se are clarified and ***,carbonaceous materials are the most widely used hosts,while polar materials are becoming more and more popular in metal-S/Se *** a comprehensive overview,it is hoped that previous research experiences can provide further reference and guidance for the sustainable development of metal-S/Se batteries.

关键词： Non-lithium batteries Sulfur/selenium cathodes Redox reaction Energy storage

DFT study on ORR catalyzed by bimetallic Pt-skin metals over substrates of Ir,Pd and Au

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Nano Materials Science 2023年第3期5卷 287-292页

作者： Xueqiang Qi tingting yang Pingbo Li Zidong Wei College of Chemistry and Chemical Engineering Chongqing University of TechnologyChongqing400054China The State Key Laboratory of Power Transmission Equipment&System Security and New Technology College of Chemistry and Chemical EngineeringChongqing UniversityChongqing400044China

Bimetallic Pt-skin catalyst is a class of near-surface alloy(NSA)that owns a high degree of control over ***,density functional theory(DFT)is used to calculate the energetics of oxygen reduction reaction(ORR)on Pt-skin over Ir,Pd and Au substrates.A Brønsted-Evans-Polanyi(BEP)relationship can be determined for the oxygen molecule *** binding energy of both atomic oxygen and hydroxyl radical is found to correlate well with the d band center of Pt-skin *** catalytic activities show the volcano relationship as the positions of each substrate in the periodic *** effect of surface strain,band structure and charge transfer on the d band center is well studied,and it can be found that the surface strain effect plays a dominant role for all Pt-skin *** substrate makes the d band center of Pt-skin go far away from the Fermi level,while Au substrate makes it move towards the Fermi *** different from both Ir and Au,Pd substrate makes the d band center of Pt-skin comparable with the monometallic Pt.

关键词： ORR DFT Pt-skin Catalysts

Distribution characteristics and controlling factors of typical heavy metals in Huanghe River estuary,China

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Journal of Oceanology and Limnology 2023年第1期41卷 150-165页

作者： Yuxi LU Dawei PAN tingting yang Chenchen WANG Institute of Oceanology Chinese Academy of SciencesQingdao 266071China CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Shandong Key Laboratory of Coastal Environmental ProcessesResearch Center for Coastal Environment Engineering Technology of Shandong ProvinceYantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China University of Chinese Academy of Sciences Beijing 100049China College of Chemistry and Chemical Engineering Yantai UniversityYantai 264005China

The geochemical characteristics and potential controlling factors of colloidal Zn,Cd,and Pb in Huanghe(Yellow)River estuary(HRE),China were *** three metals were highly variable over a range of spatiotemporal scales,comprehensively forced by various physical and biological *** dissolved Zn,Cd,and Pb varied from 200.1 to 321.7,2.6 to 4.1,and 0.5 to 1.0 nmol/L,*** one near-estuarine station of Zn had contamination factor values>1,which indicate the lower contaminant *** dissolved species of Zn,Cd and Pb were fractionated,namely<1 kDa,1-3 kDa,3-10 kDa,10-100 kDa,and 100 kDa-0.45μ***<1 kDa truly dissolved phase was the main fraction of the three dissolved metals(50%-62%),while the 100-kDa-0.45-μm high molecular weight colloidal fraction was dominant in their respective colloidal *** input and sediment acted as important sources of strong ligands and natural colloids for the HRE water system.<3-kDa Zn and Pb were susceptible to the dissolved oxygen,the behaviors of colloidal Zn and 3-10-kDa Pb were related to dissolved organic carbon(DOC).However,no significant correlation between each dissolved fraction of Cd and salinity,pH,temperature,colloidal organic carbon,and DOC was found in this ***,these findings,completed by the evaluation of the dissolved species of Zn,Cd,and Pb at 10 sites over the river-sea mixing zone,provided new insights into the colloidal heterogeneity that affect metals geochemical features,migration and fate in estuaries.

关键词： colloidal heavy metal size fraction Huanghe(Yellow)River estuary geochemical feature

The Effects of Groundwater Depth on the Soil Evaporation in Horqin Sandy Land, China

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Chinese Geographical Science 2021年第4期31卷 727-734页

作者： yang tingting ALA Musa GUAN Dexin WANG Anzhi Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110000China College of Environmental Science and Engineering Liaoning Technical UniversityFuxin 123000China

The interactions between groundwater depth and soil hydrological processes, play an important role in both arid and semi-arid ecosystems. The effect of groundwater depth on soil water variations were neglected or not explicitly treated. In this paper, we combine a simulation experiment and a water flow module of HYDRUS-1D model to study the variation in soil evaporation under different groundwater depth conditions and the relationship between groundwater depth and evaporation efficiency in Horqin Sandy Land, *** results showed that with an increase in groundwater depth, the evaporation of soil and the recharge of groundwater decrease. In this study, the groundwater recharge did not account for more than 21% of the soil evaporation for the depths of groundwater examined. The soil water content at 60 cm was less affected by the evaporation efficiency when the mean groundwater depth was 61 cm during the experimental period. In addition, the evaporation efficiency(the ratio of actual evaporation to potential evaporation) decreases with the increase in groundwater depth during the experiment. Furthermore, the soil evaporation was not affected by groundwater when the groundwater depth was deeper than 239 cm.

关键词： groundwater depth soil evaporation evaporation efficiency HYDRUS-1D