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Study on Magnetic Domain Structure of Co/Pt Dots Array

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Chinese Journal of Electronics 2017年第3期26卷 654-657页

作者： ZHU Xifu JING Xiaojun du huan Teacher's colleage Beijing Union University School of Information and Communication Engineering Beijing University of Posts and Telecommunications Institute of Microelectronics of the Chinese Academy of Sciences

Co/Pt multilayer dots arrays with 580-nm periodicity were fabricated using Laser interference lithography(LIL)and an ion-beam milling *** obtained uniform dots arrays with a large area by optimizing the exposure parameters and improving exposure *** obtained their shapes and magnetic domain structures and investigated using an Atomic force microscope(AFM)and Magnetic force microscope(MFM).The AFM and MFM images show:1)when their size is smaller than 400nm,the dots are in single-domain state and their shape tends to be circular;and 2)when their size is greater than 400nm,the dots are in multi-domain state and they tend to form *** dots arrays possibly can be used in nano-scale magnetic storage.

关键词： Magnetic domain structures Co/Pt dots arrays AFM and MFM images Single domain state Multi-domain state

Recent progress in investigations of surface structure and properties of solid oxide materials with nuclear magnetic resonance spectroscopy

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Chinese Chemical Letters 2018年第6期29卷 747-751页

作者： Jia-huan du Luming Peng Key Laboratory of Mesoscopic Chemistry of Ministry of Education School of Chemistry and Chemical Engineering Nanjing University

Solid oxide materials have widespread applications which are often associated with their surface structure and properties. Solid-state nuclear magnetic resonance（NMR） spectroscopy is one of the most powerful methods that give detailed local structural information of solid materials. Recent developments in dynamic nuclear polarization（DNP） NMR spectroscopy and17 O surface-selective isotopic labeling provide more opportunities in investigations of surface structure and properties of oxide materials. We describe in this review some of the latest progress in this field. DNP NMR can enhance the sensitivity of surface sites on the oxides by one to two order of magnitude, making very low concentrated species on the surface of oxides visible in NMR spectroscopy. On the basis of surface-selective17 O isotopic labeling,17 O NMR spectroscopy is now able to distinguish surface oxygen species on the different facets or different surface layers in oxide nanostructures. The nature of these facets can also be probed with help of31 P NMR spectroscopy along with phosphorous-containing probe molecules.

关键词： NMR Oxide Surface ^17O DNP

Advanced Li-SexSy battery system:Electrodes and electrolytes

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Journal of Materials Science & Technology 2020年第20期52卷 1-15页

作者： huan du Shihao Feng Wen Luo Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Department of Physics School of ScienceWuhan University of TechnologyWuhan430070China

The worldwide energy shortage has led to numerous researches for the exploration of new-type battery materials to deal with the energy *** achieve a great leap in energy density,the study of high capacity electrode materials plays a major *** a replacement to the energy accumulation system of lithium-sulfur(Li-S) and lithium-selenium(Li-Se) batteries,great concern is generated over lithium/selenium-sulfur(Li-SexSy) batteries as they combine the advantages of S(high capacity) and Se(improved electrical conductivity),consequently stands for extensive new cathode *** recent years,widespread researches have been conducted and great achievements have been *** review sums up the research status on Li-SexSy batteries and concentrates on the outstanding work of SexSy cathode *** reaction mechanism and capacity fading mechanism are *** performance-structure relationship is stated in regard of different cathode structures,including a variety of carbon hosts,conducting polymer hosts,transition metal-doped carbon electrodes and various Se/S *** compatibilities of frequently-used carbonate-based and ether-based electrolyte and other new-type electrolytes for Li-SexSy battery are *** for the future developments of Li-SexSy batteries are finally proposed.

关键词： Selenium-sulfur Cathode materials Electrolytes Lithium-sulfur

Nonlinear Longitudinal Attitude Control of an Unmanned Seaplane with Wave Filtering

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International Journal of Automation and computing 2016年第6期13卷 634-642页

作者： huan du Guo-Liang Fan Jian-Qiang Yi Institute of Automation Chinese Academy of Sciences

A new longitudinal attitude control system design for an unmanned seaplane in the severe sea states is presented in this paper. We develop a nonlinear passive observer, which is used to achieve wave filtering and state estimation. Moreover, the observer can be extended to achieve adaptive wave filtering in varying sea states. Using the estimated low-frequency states, a backstepping sliding mode controller is designed to keep the longitudinal attitude of the unmanned seaplane stable. The stability of the total closed loop system is analyzed by using Lyapunov theory. Simulations are performed in different wave conditions, including Seastate 3 and Seastate 5. The simulations results show that the proposed longitudinal attitude controller can improve the anti-waves capability effectively. Moreover, adaptive wave filter has a significant advantage over a filter with fixed model parameters in varying sea states.

关键词： observer backstepping unmanned sliding attitude longitudinal guaranteed disturbance filtering desired

Towards applications of genome-scale metabolic model-based approaches in designing synthetic microbial communities

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Quantitative Biology 2023年第1期11卷 15-30页

作者： huan du Meng Li Yang Liu Archaeal Biology Center Institute for Advanced StudyShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Marine Microbiome Engineering Institute for Advanced StudyShenzhen UniversityShenzhen 18060China

Background:Synthetic microbial communities,with different strains brought together by balancing their nutrition and promoting their interactions,demonstrate great advantages for exploring complex performance of communities and for further biotechnology *** potential of such microbial communities has not been explored,due to our limited knowledge of the extremely complex microbial interactions that are involved in designing and controlling effective and stable ***:Genome-scale metabolic models(GEM)have been demonstrated as an effective tool for predicting and guiding the investigation and design of microbial communities,since they can explicitly and efficiently predict the phenotype of organisms from their genotypic data and can be used to explore the molecular mechanisms of microbehabitats and microbe-microbe *** this work,we reviewed two main categories of GEM-based approaches and three uses related to design of synthetic microbial communities:predicting multi-species interactions,exploring environmental impacts on microbial phenotypes,and optimizing community-level ***:Although at the infancy stage,GEM-based approaches exhibit an increasing scope of applications in designing synthetic microbial *** to other methods,especially the use of laboratory cultures,GEM-based approaches can greatly decrease the trial-and-error cost of various procedures for designing synthetic communities and improving their functionality,such as identifying community members,determining media composition,evaluating microbial interaction potential or selecting the best community *** efforts should be made to overcome the limitations of the approaches,ranging from quality control of GEM reconstructions to community-level modeling algorithms,so that more applications of GEMs in studying phenotypes of microbial communities can be expected.

关键词： genome-scale metabolic modeling microbial community design interspecies interaction environmental impact community-level performance

A general method for one-step synthesis of monofluoroiodane(Ⅲ)reagents using silver difluoride

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Chinese Chemical Letters 2022年第11期33卷 4834-4837页

作者： Jing Ren Meng-Cheng Jia Feng-huan du Chi Zhang State Key Laboratory of Elemento-Organic Chemistry The Research Institute of Elemento-Organic ChemistryCollege of ChemistryNankai UniversityTianjin 300071China

Herein we report a new general method for one-step synthesis of four kinds of fluoroiodane(Ⅲ)reagents by treating the corresponding aryl iodides with silver difluoride(AgF_(2)).This is the first method applicable for the synthesis of all four fluoroiodane(Ⅲ)reagents including p-iodotoluene difluoride(1),fluoro-benziodoxole(2),fluoro-benziodoxolone(3),and fluoro-N-acetylbenziodazole(4).AgF_(2)was firstly employed in the direct oxidative fluorination of iodobenzene and thus has shown its outstanding oxidation and fluorine-transfer *** use of AgF_(2)has improved the synthesis of fluoroiodane(Ⅲ)reagents by shortening the reaction steps,avoiding the use of hazardous reagents,and simplifying the experimental *** was worth noting that we have developed the first one-step direct synthetic method for 3,while 3 can only be synthesized through Cl→F ligand exchange reaction previously.

关键词： Monofluoroiodane(Ⅲ)reagents Silver difluoride Iodobenzene derivatives One-step synthesis DFT calculations

High Performance Top-Emitting Organic Light-Emitting Diodes for Super Video Graphics Array Monochromatic Microdisplays Application

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Chinese Journal of Chemistry 2015年第8期33卷 897-901页

作者： Yukun Wu Zhensong Zhang Shouzhen Yue Ran huang huan du Yi Zhao State Key Laboratory on Integrated Optoelectronics College of Electronics Science and Engineering Jilin University Changchun Jilin 130012 China Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China

We have demonstrated a high perlbrmance top-emitting organic light-emitting diode （TEOLED） achieving a brightness of 1000 cd/m^2 at a low voltage of 3.4 V, a power efficiency of 55.2 lm/W at a brightness of 611cd/m^2. and a low efficiency roll-off 5.1% calculated from the maximum efficiency value to that of 5000 cd/m^2. Such im- proved properties are controlled by electron injection from 7-diphenyl-1,10-phenanthroline （BPhen） into and trans- port by the 2,4,6-tris[3＇-（pyridin-3-yl）biphenyl-3-yl]-l,3,5-triazine （TmPPPyTz） layer along with hole injection from 4,4＇,4＂-tris（N-carbazolyl）diphenylamine （TcTa） directly into the fac-tris（2-phenylpyridine）iridium [lr（ppy）3] highest occupied molecular level （HOMO）, leading to direct carrier recombination and excitons formation on the phosphor dopants. Eventually we integrated our high performance TEOLEDs on complementary metal oxide semi- conductor （CMOS） substrates to realize super video graphics array （SVGA） OLED microdisplays.

关键词： top-emitting organic light-emitting diodes organic light-emitting diodes microdisplay super video graphics array

Dynamic changes in physicochemical property,biogenic amines content and microbial diversity during the fermentation of Sanchuan ham

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Food Science and Human Wellness 2024年第1期13卷 506-516页

作者： Zhongai Chen Hong Chen huan du Cong Chen Kaixiang Lu Qiaoli Xue Yongjin Hu College of Food Science and Technology Yunnan Agricultural UniversityKunming 650000China Institute of Food Processing Guizhou Academy of Agricultural SciencesGuiyang 550006China Editorial Department of Journal of Yunnan Agricultural University Yunnan Agricultural UniversityKunming 650000China

Sanchuan ham is appreciated in Yunnan Province,China,for its characteristic flavor and taste,while the microbial community structure and biogenic amines content remain unclear during fermentation *** this study,we explored the physicochemical property,biogenic amines concentration and microbial diversity of external and internal Sanchuan ham by high-throughput sequencing during the processing of Sanchuan *** showed that the nitrite remained at a stable level of 0.15 mg/kg which was significantly lower than the national health standard safety level of 20 mg/*** addition,compared with fresh hams,the content of total free amino acids in ripe Sanchuan ham has grown 14 folds;sour and bitter were the main tastes of Sanchuan ***,the concentration of cadaverine was the highest of all biogenic amines during the entire fermentation *** the bacterial phyla level,Firmicutes and Actinobacteria were the two main phyla,while at the genus level,Staphylococcus was a significant strain throughout the whole ***,the dry stage has a great impact on the succession change of microbial community ***,the change trends and composition of bacteria in the interior have slight discrepancies with those of the exterior of Sanchuan ham.

关键词： Sanchuan ham Nitrite cont ent Free amino acids Cadaverine Staphylococcus

Grounding fault location method of overhead line based on dual-axis magnetic field trajectory

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Protection and Control of Modern Power Systems 2023年第1期8卷 67-80页

作者： Xiaowei Wang huan du Jie Gao Xiangxiang Wei Zhenfeng Liang Liang Guo Weibo Liu School of Electrical Engineering Xi’an University of TechnologyXi’an 710048China School of Electrical Engineering Xi’an Jiaotong UniversityXi’anChina 3 Technische Universität Berlin1062 Berlin Germany Jiangxi Electric Power Research Institute of State Grid Nanchang 330000China

To address the challenges in fault location in distribution networks,the distribution of magnetic field under overhead line and its relationship with three-phase currents are explored in this *** the same time,considering the influ-ence of sensor installation position,line sag and galloping on magnetic field,a grounding fault location method of an overhead line based on dual-axis magnetic field trajectory is *** analytical expressions of the magnetic field on the x-axis and y-axis under the overhead line are obtained by least squares *** Lissajous figure synthe-sized by dual-axis is then compared with the general equation of an ellipse,and the characteristic quantity expression characterizing the magnetic field trajectory structure is ***,a fault location criterion is constructed using the difference of the characteristic quantities of the ellipses synthesized by x-axis and y-axis magnetic fields upstream and downstream of the fault point,i.e.,the difference of the length of the major axis and the minor axis,and the sign for the ratio of the cosine value of the inclination *** with other location methods based on electrical quantity,the principle of this method is simpler and it can locate faults more quickly and accurately.A large number of simulation results show that the proposed method is suitable for different types of fault conditions.

关键词： Magnetic field Fault location Lissajous figure Distribution network