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Magnetoelectric coupling effect of polarization regulation in BiFeO_(3)/LaTiO_(3)heterostructures

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Chinese Physics B 2021年第7期30卷 387-393页

作者： Chao Jin feng-Zhu Ren Wei Sun Jing-Yu Li Bing Wang qin-fen gu Institute for Computational Materials Science School of Physics and ElectronicsInternational Joint Research Laboratory of New Energy Materials and Devices of Henan ProvinceHenan UniversityKaifeng 475004China Australian Synchrotron ANSTO800 Blackburn RdClaytonVIC3168Australia

An effective regulation of the magnetism and interface of ferromagnetic materials is not only of great scientific significance,but also has an urgent need in modern *** this work,by using the first-principles calculations,we demonstrate an effective approach to achieve non-volatile electrical control of ferromagnets,which proves this idea in multiferroic heterostructures of ferromagnetic La TiO_(3)and ferroelectric Bi FeO_(3).The results show that the magnetic properties and two-dimensional electron gas concentrations of La TiO_(3)films can be controlled by changing the polarization directions of Bi FeO_(3).The destroyed symmetry being introduced by ferroelectric polarization of the system leads to the transfer and reconstruction of the Ti-3 d electrons,which is the fundamental reason for the changing of magnetic *** multiferroic heterostructures will pave the way for non-volatile electrical control of ferromagnets and have potential applications.

关键词： first-principles calculations BiFeO_(3)/LaTiO_(3)heterostructures magnetoelectric coupling effect polarization regulation

A single image dehazing method based on decomposition strategy

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Journal of Systems Engineering and Electronics 2022年第2期33卷 279-293页

作者： qin Chaoxuan gu Xiaohui School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Southwest Technology and Engineering Research Institute Chongqing 400039China

Outdoor haze has adverse impact on outdoor image quality,including contrast loss and poor *** this paper,a novel dehazing algorithm based on the decomposition strategy is *** combines the advantages of the two-dimensional variational mode decomposition(2DVMD)algorithm and dark channel *** original hazy image is adaptively decom-posed into low-frequency and high-frequency images according to the image frequency band by using the 2DVMD *** low-frequency image is dehazed by using the improved dark channel prior,and then fused with the high-frequency ***,we optimize the atmospheric light and transmit-tance estimation method to obtain a defogging effect with richer details and stronger *** proposed algorithm is com-pared with the existing advanced *** results show that the proposed algorithm has better performance in comparison with the state-of-the-art algorithms.

关键词： single image dehazing decomposition strategy image processing global atmospheric light

Diagnostic Efficacy of^(18)F-FDG PET/CT in Detecting Bone Marrow Infiltration in Patients with Newly Diagnosed Diffuse Large B-Cell Lymphoma

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Biomedical and Environmental Sciences 2023年第6期36卷 510-516页

作者： guO Bo qin Ran gu Zhen Yang LI Yan fen GAO Lei HUANG Wen Rong Department of Hematology The Second Medical Center&National Clinical Research Center for Geriatric DiseasesChinese PLA General HospitalBeijing 100853China Department of Hematology The Fifth Medical CenterChinese PLA General HospitalBeijing 100071China Department of Medical Engineering Medical Supplies Center of PLA General HospitalBeijing 100039China

Objective Diffuse large B-cell lymphoma(DLBCL)is often associated with bone marrow infiltration,and 2-deoxy-2-(18F)fluorodeoxyglucose positron emission tomography/computed tomography(^(18)F-FDG PET/CT)has potential diagnostic significance for bone marrow infiltration in *** A total of 102 patients diagnosed with DLBCL between September 2019 and August 2022 were *** marrow biopsy and^(18)F-FDG PET/CT examinations were performed at the time of initial *** tests were used to evaluate the agreement of^(18)F-FDG PET/CT with the gold standard,and the imaging features of DLBCL bone marrow infiltration on PET/CT were *** The total detection rate of bone marrow infiltration was not significantly different between PET/CT and primary bone marrow biopsy(P=0.302)or between the two bone marrow biopsies(P=0.826).The sensitivity,specificity,and Youden index of PET/CT for the diagnosis of DLBCL bone marrow infiltration were 0.923(95%CI,0.759-0.979),0.934(95%CI,0.855-0.972),and 0.857,***^(18)F-FDG PET/CT has a comparable efficiency in the diagnosis of DLBCL bone marrow ***/CT-guided bone marrow biopsy can reduce the misdiagnosis of DLBCL bone marrow infiltration.

关键词： Diffuse large B-cell lymphoma Bone marrow infiltration Positron emission computed tomography(PET/CT) Bone marrow biopsy Diagnostic efficacy

Feedback control for a class of second order hyperbolic distributed parameter systems

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Science China(Information Sciences) 2016年第9期59卷 156-164页

作者： qin FU Weiguo gu Panpan gu Jianrong WU School of Mathematics and Physics Suzhou University of Science and Technology

This paper deals with the problem of state feedback control for a class of the distributed parameter systems with the disturbance term. And the considered distributed parameter systems are composed of the second order hyperbolic partial differential equations. Two different classes of restrictions on the disturbance term are given, one is that the disturbance term satisfies the linear growth constraint condition to the state variables of the system, and the other is that the disturbance term obeys the bound constraint under the significance of L2. Based on a variable structure method, the state feedback controllers are obtained by means of constructing appropriate Lyapunov functional. The closed-loop systems are globally asymptotically stable on W1,2（0, 1） × L2（0, 1） space under the effect of the state feedback control laws. Simulation results illustrate the effectiveness of the proposed method.

关键词： state feedback globally asymptotically stable second order hyperbolic distributed parameter sys tems variable structure method Lyapunov functional

Mechanism study on flotation separation of molybdenite from chalcocite using thioglycollic acid as depressant

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International Journal of Mining Science and Technology 2017年第6期27卷 1043-1049页

作者： qin Wenqing Wu Jiajia Jiao fen Zeng Jinming School of Minerals Processing and Bioengineering Central South University Changsha 410083 China

Effects of collectors(butyl xanthate(BX), O-isopropyl-N-sulfur ethyl carbamate(Z-200) and emulsified kerosene), dereagent(sodium sulfide) and depressant thioglycollic acid(TGA) on the flotation of chalcocite and molybdenite were investigated through flotation. The first principle theory was adopted to understand the difference of their surfaces and reaction between minerals and reagents. Results of flotation tests revealed that selectivity of emulsified kerosene is the best of three collectors in separation of chalcocite and molybdenite, though the others also display excellent collecting properties. Sodium sulfide can effectively remove collectors adsorbed on chalcocite surface, and TGA is an effective depressant of chalcocite at pH 8-9. Through first principle study, molybdenite displays relatively stronger covalence property while bonding interaction between copper atoms in chalcocite enhanced its ionicity. Bonding interaction is weaker in reaction of TGA and molybdenite, so it shows higher hydrophobicity and better flotability. Therefore, TGA is an effective inhibitor in the separation.

关键词： Chalcocite Molybdenite Thioglycollic acid Flotation First-principles study

Preparation of nitrogen-doped titania and its photocatalytic activity

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Rare Metals 2007年第3期26卷 254-262页

作者： qin Haoli gu guobang LIU Song College of Chemistry South China University of Technology Guangzhou 510640 China School of Science Guizhou Normal University Guiyang 550001 China

Yellowish nitrogen-doped titania was produced through sol-gel method in mild condition, with the elemental nitrogen derived from aqua ammonia. The titania catalysts were characterized using XRD, BET, TEM, XPS, and UV-Vis diffuse reflectance spectrophotometer, and their photocatalytic activities were evaluated under UV and visible light, respec tively. The XRD results showed that all titania catalysts were anatase. More significantly, the crystallite size of nitrogen-doped titania increased with an increase in N/Ti proportion, and the doping of nitrogen could extend the absorption shoulder into the visible-light region, thus it possessed a higher visible-light activity illustrated by decolorization of methyl orange （65.3%） under the irradiation of visible light, whereas pure titania showed little of such kind of visible light activity. The UV-light activity of nitrogen-doped titania catalysts was worse than that of pure titania and Degussa P25. In the range of N/Ti proportion of 4-10 mol%, the activity of nitrogen-doped titania weakened appreciably in the visible-light region as the N/Ti proportion increased, whereas a reverse relationship existed under the irradiation of UV light.

关键词： photocatalysts titania nitrogen-doped methyl orange

Iterative learning control for one-dimensional fourth order distributed parameter systems

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Science China(Information Sciences) 2017年第1期60卷 177-189页

作者： qin FU Panpan gu Jianrong WU School of Mathematics and Physics Suzhou University of Science and Technology

This paper addresses the problem of iterative learning control algorithm for high order distributed parameter systems in the presence of initial errors. And the considered distributed parameter systems are composed of the one-dimensional fourth order parabolic equations or the one-dimensional fourth order wave equations. According to the characteristics of the systems, iterative learning control laws are proposed for such fourth order distributed parameter systems based on the P-type learning scheme. When the learning scheme is applied to the systems, the output tracking errors on 2L space are bounded, and furthermore, the tracking errors on 2L space can tend to zero along the iteration axis in the absence of initial errors. Simulation examples illustrate the effectiveness of the proposed method.

关键词： P-type learning scheme iterative learning control distributed parameter systems fourth order parabolic equation fourth order wave equation

Winter wheat identification by integrating spectral and temporal information derived from multi-resolution remote sensing data

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Journal of Integrative Agriculture 2019年第11期18卷 2628-2643页

作者： ZHANG Xi-wang LIU Jian-feng Zhenyue qin qin fen Key Laboratory of Geospatial Technology for Middle and Lower Yellow River Regions Ministry of EducationKaifeng 475004P.R.China Research School of Computer Science The Australian National UniversityCanberra 2601Australia College of Environment and Planning Henan UniversityKaifeng 475004P.R.China Yellow River Conservancy Technical Institute Kaifeng 475004P.R.China Institute of Urban Big Data Henan UniversityKaifeng 475004P.R.China

Timely crop acreage and distribution information are the basic data which drive many agriculture related *** identifying crop types based on remote sensing,methods using only a single image type have significant *** research that integrates fine and coarser spatial resolution images,using techniques such as unmixing methods,regression models,and others,usually results in coarse resolution abundance without sufficient detail within pixels,and limited attention has been paid to the spatial relationship between the pixels from these two kinds of *** we propose a new solution to identify winter wheat by integrating spectral and temporal information derived from multi-resolution remote sensing data and determine the spatial distribution of sub-pixels within the coarse resolution ***,the membership of pixels which belong to winter wheat is calculated using a 25-m resolution resampled Landsat Thematic Mapper(TM)image based on the Bayesian ***,the winter wheat abundance(acreage fraction in a pixel)is assessed by using a multiple regression model based on the unique temporal change features from moderate resolution imaging spectroradiometer(MODIS)time series ***,winter wheat is identified by the proposed Abundance-Membership(AM)model based on the spatial relationship between the two types of ***,winter wheat is identified by comparing the spatially corresponding 10×10 membership pixels of each abundance *** other words,this method takes advantage of the relative size of membership in a local space,rather than the absolute size in the entire study *** method is tested in the major agricultural area of Yiluo Basin,China,and the results show that acreage accuracy(Aa)is 93.01%and sampling accuracy(As)is 91.40%.Confusion matrix shows that overall accuracy(OA)is 91.4%and the kappa coefficient(Kappa)is *** values are significantly improved compared to the traditional Maximum Likeli

关键词： temporal change characteristics membership abundance winter wheat multi-resolution remote sensing

The Synthesis of Dialdehyde from Sodium Hydrogen Telluride with 1,1',3,3'-Tetramethyl-2,2'-bis-benzimidazolium Salt

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Chinese Chemical Letters 2002年第9期13卷 836-838页

作者： Yue, Ke fen gu, Huan Shi, Zhen Department of Chemistry Northwest University Xi'an 710069 China

The reaction of bis-benzimidazolium salts with sodium hydrogen telluride is reported, and a new synthetic method for dialdehydes is provided.

关键词： Bis-benzimidazolium salt sodium hydrogen telluride dialdehyde synthesis.