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Acta Mathematica Sinica,English Series 2017年第12期33卷 1587-1596页

作者： wen qiang SHEN Department of Mathematical Sciences Tsinghua University Beijing 100084 P. R. China

In this paper, we generalize Rees-Shishikura＇s theorem to the class of geometrically finite rational maps.

关键词： Geometrically finite rational map Rees-Shishikura's theorem homeomorphism

Spontaneous Infection and Periodic Evolving of Domain in a Diffusive SIS Epidemic Model

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 164-191页

作者： qiang wen Guo-qiang Ren Bin Liu School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan430074China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan430074China

In this paper, we consider a susceptible-infective-susceptible(SIS) reaction-diffusion epidemic model with spontaneous infection and logistic source in a periodically evolving domain. Using the iterative technique,the uniform boundedness of solution is established. In addition, the spatial-temporal risk index R0(ρ) depending on the domain evolution rate ρ(t) as well as its analytical properties are discussed. The monotonicity of R0(ρ)with respect to the diffusion coefficients of the infected dI, the spontaneous infection rate η(ρ(t)y) and interval length L is investigated under appropriate conditions. Further, the existence and asymptotic behavior of periodic endemic equilibria are explored by upper and lower solution method. Finally, some numerical simulations are presented to illustrate our analytical results. Our results provide valuable information for disease control and prevention.

关键词： diffusive SIS model spontaneous infection periodically evolving domain periodic endemic equilibrium

Design,Synthesis and Electrochromic Properties of Anthraquinone Imide-based Donor-acceptor Type of Near Infrared Chromophores

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Chemical Research in Chinese Universities 2012年第2期28卷 239-241页

作者： QIAO wen-qiang Key Laboratory of Materials Behaviors and Evaluation Technology in Space Environments Harbin Institute of TechnologyHarbin 150001P.R.China

A new series of near infrared（NIR） electrochromic anthraquinone imides containing a triphenylamine moiety as an electron donor was synthesized and their electrochemical and spectroelectrochemical behavior were *** results show that the new anthraquinone imides are redox active which can be reduced electrochemically from the neutral state to the radical anion form that absorbs in a range of 700―1200 nm.

关键词： Anthraquinone imide Triphenylamine moiety Near infrared electrochromism

Efficiently simulating the work distribution of multiple identical bosons with boson sampling

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Frontiers of physics 2024年第3期19卷 197-206页

作者： wen-qiang Liu Zhang-qi Yin Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements(MOE) School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Boson sampling has been theoretically proposed and experimentally demonstrated to show quantum computational ***,it still lacks the deep understanding of the practical applications of boson *** we propose that boson sampling can be used to efficiently simulate the work distribution of multiple identical *** link the work distribution to boson sampling and numerically calculate the transition amplitude matrix between the single-boson eigenstates in a one-dimensional quantum piston system,and then map the matrix to a linear optical network of boson *** work distribution can be efficiently simulated by the output probabilities of boson sampling using the method of the grouped probability *** scheme requires at most a polynomial number of the samples and the optical *** work opens up a new path towards the calculation of complex quantum work distribution using only photons and linear optics.

关键词： quantum simulation quantum work distribution boson sampling linear optic

Application of hybrid operating rooms for treating spinal dural arteriovenous fistula

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World Journal of Clinical Cases 2020年第6期8卷 1056-1064页

作者： Nai Zhang wen-qiang Xin Department of Neurosurgery Tianjin Medical University General HospitalTianjin 300052China

BACKGROUND A hybrid operating room(hybrid-OR)is a surgical space that combines a conventional operating room with advanced medical imaging *** To explore and summarize the technical features and effectiveness of the application of a hybrid-OR in dealing with spinal dural arteriovenous fistulas(SDAVFs).METHODS Eleven patients with SDAVFs were treated with the use of a hybrid-OR at the Department of Neurosurgery of our hospital between January 2015 and December *** dual-marker localization technique was used in the hybrid-OR to locate the SDAVFs and skin incision,and the interoperative digital subtraction angiography(DSA)technique was used before and after microsurgical ligation of the fistulae in the hybrid-OR to verify the accuracy of *** patients were followed for an average of 2 years after the operation,and the preoperative American Spinal Cord Injury Association(ASIA)score and postoperative ASIA score at 6 mo after the operation were *** The location and skin incision of the SDAVFs were accurately obtained by using the dual-marker localization technique in the hybrid-OR in all patients,and there were no cases that required expansion of the range of the bone window in order to expose the *** error obliteration occurred and was identified in two patients by using the intraoperative DSA technique;therefore,the findings provided by the intraoperative DSA system significantly changed the surgical procedure in these two *** the assistance of the hybrid-OR,the feeding artery was correctly ligated in all cases,and the intraoperative error obliteration rate decreased from 18.2%(2/11)to 0%.All 11 patients were followed for an average of 2 *** ASIA score at 6 mo after the operation was significantly improved compared with the preoperative ASIA score,and there were no patients with late recurrence during the *** Compared with intra-arterial embolization for the treatment of SDAVFs,hyb

关键词： Spinal dural arteriovenous fistula Hybrid operating room Dual-marker localization technique Interoperative DSA technique Retrospective study

Application of hybrid operating rooms for clipping large or giant intracranial carotid-ophthalmic aneurysms

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World Journal of Clinical Cases 2020年第21期8卷 5149-5158页

作者： Nai Zhang wen-qiang Xin Department of Neurosurgery Tianjin Medical University General HospitalTianjin 300052China

BACKGROUND A hybrid operating room(Hybrid-OR)is a surgical theatre that combines a conventional operating room with advanced medical imaging *** are still plenty of limitations when endovascular treatment or microsurgical treatment is used individually to treat large or giant carotid-ophthalmic *** To explore and summarize the technical features and effectiveness of the application of a Hybrid-OR in managing major intracranial carotid-ophthalmic *** The Department of Neurosurgery treated 12 cases of large or giant intracranial carotid-ophthalmic aneurysms between March 2013 and December 2019 in a *** cases were treated with clipping and parent vessel *** With the assistance of the Hybrid-OR,the rate of incomplete intraoperative aneurysm clipping decreased from 25%(3/12)to 0%,while the rate of vessel stenosis decreased from 16.7%(2/12)to 8.35%(1/12).In terms of thromboembolic events,ischemic infarction complication occurred in only one patient,and none of the patients experienced embolic infarction *** 12 patients were followed for an average of 3 years,and no aneurysms *** postoperative recovery was evaluated with the modified Rankin Scale(mRS):11 patients showed no symptoms(mRS=0),1 patient showed slight disability(mRS 1-2),and none of the patients had severe disability(mRS=5)or died(mRS=6).CONCLUSION The Hybrid-OR provides new ideas for the surgical clipping of large or giant intracranial carotid-ophthalmic aneurysms and decreases the rate of intraoperative vessel stenosis and unsuccessful clipping.

关键词： Balloon Microsurgical clipping Hybrid operating room Large or giant carotid-ophthalmic aneurysm

Differentially private feature selection under MapReduce framework

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The Journal of China Universities of Posts and Telecommunications 2013年第5期20卷 85-90,103页

作者： CHEN Kai WAN wen-qiang LI Yun College of Computer Science Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Institute of Computer Technology Nanjing University of Posts and Telecommunications

Privacy preserving data mining algorithms are crucial for the personal data analysis, such as medical and financial records. This paper focuses on feature selection and proposes a new privacy preserving distributed algorithm, which can effectively select features based on differential privacy and Gini index under the MapReduce framework. At the same time, the theoretic analysis for privacy guarantee is also presented. Some experiments are conducted on bench-mark datasets, the simulation results indicate that during the selection of important features, the proposed algorithm can preserve privacy information to a certain extent with less time cost than on centralized counterpart.

关键词： data mining feature selection differential privacy MapReduce

Mean-Field Backward Stochastic Differential Equations Driven by Fractional Brownian Motion

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Acta Mathematica Sinica,English Series 2021年第7期37卷 1156-1170页

作者： Yu Feng SHI Jia qiang wen Jie XIONG Institute for Financial Studies and School of Mathematics Shandong UniversityJinan 250100P.R.China Department of Mathematics Southern University of Science and TechnologyShenzhen 518055P.R.China Department of Mat hematics and SUSTech International Center for Mathematics Southern University of Science and TechnologyShenzhen 518055P.R.China

In this paper,we study a new class of equations called mean-field backward stochastic differential equations(BSDEs,for short)driven by fractional Brownian motion with Hurst parameter H>1/***,the existence and uniqueness of this class of BSDEs are ***,a comparison theorem of the solutions is ***,as an application,we connect this class of BSDEs with a nonlocal partial differential equation(PDE,for short),and derive a relationship between the fractional mean-field BSDEs and PDEs.

关键词： Mean-field backward stochastic differential equation fractional Brownian motion partial differential equation

Microstructural evolution during reheating of A356 machining chips at semisolid state

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International Journal of Minerals,Metallurgy and Materials 2017年第8期24卷 891-900页

作者： Fang Wang wen-qiang Zhang wen-long Xiao Hiroshi Yamagata Chao-li Ma Key Laboratory of Aerospace Advanced Materials and Performance of the Ministry of Education School of Materials Science and Engineering Beihang University Center for Advanced Die Engineering and Technology Gifu University

The microstructural evolution of A356 machining chips in the semisolid state was studied at different temperatures and holding times. The results showed that the elongated α-Al grains first recrystallized in the semisolid state and then became globular with a high shape factor(SF). Both the temperature and the holding time clearly affected the grain size and SF. When the heating temperature or holding time was increased, the grain size and SF gradually increased and finally became stable. Moreover, the Vickers hardness of primary α-Al grains gradually decreased with increasing heating temperature. The optimal slurry for semisolid processing, with a good combination of grain size and SF, was obtained when the chips were held at 600℃ for 15 min. The semisolid slurry of A356 chips exhibited a lower coarsening rate of α-Al grains than those produced by most of the conventional semisolid processes. The coarsening coefficient was determined to be 436 μm^3·s^(-1) on the basis of the linear Lifshitz–Slyozov–Wagner(LSW) relationship.

关键词： semisolid slurry aluminum chips microstructural evolution grain coarsening microhardness

PREPARATION OF POLYMER MICROSPHERES WITH PYRIDYL GROUP AND THEIR STABILIZED GOLD METALLIC COLLOIDS

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Chinese Journal of Polymer Science 2007年第6期25卷 555-563页

作者： Shu-ning Li Xin-lin Yang wen-qiang Huang Key Laboratory of Functional Polymer Materials the Ministry of Education Institute of Polymer Chemistry Nankai University Tianjin 300071 China

Narrow disperse poly（ethyleneglycol dimethacrylate-co-4-vinylpyridine）（poly（EGDMA-co-4-VPy）） microspheres were prepared by distillation-precipitation copolymerization of ethyleneglycol dimethacrylate （EGDMA） and 4-vinylpyridine （4-VPy） with 2,2＇-azobisisobutyronitrile （AIBN） as initiator in neat acetonitrile. The polymer microspheres containing pyridyl group were then utilized as stabilizer for gold metallic colloids with the diameter around 7 nm, which were prepared by the in situ reduction of gold chloride trihydrate with sodium borohydride through the coordination of the pyridyl group on the gel layer and surface of the microsphere with the gold metallic nano-particles. The catalytic properties of the pyridyl- functionalized microsphere-stabilized gold metallic colloids and the behavior of the stabilized-catalyst for the recycling were investigated with reduction of 4-nitrophenol to 4-aminophenol as a model reaction.

关键词： Polymer microsphere Distillation-precipitation polymerization Pyridyl group Gold metallic colloids Catalysis.