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Preparation and application of microfluidic SERS substrate:Challenges and future perspectives

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Journal of materials Science & Technology 2020年第2期37卷 96-103页

作者： Jiuchuan Guo Fanyu Zeng Jinhong Guo xing ma School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Flexible Printed Electronic Technology Center School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China

Surface-enhanced Raman spectroscopy(SERS),as a highly sensitive molecular analysis technique,can realize fast and non-destructive detection of the information of molecular bonds to identify the component of analytes by"fingerprint"*** preparation of SERS substrates plays an extremely important role in the development of SERS technology and the application of SERS *** integrating SERS enhancement substrates into microfluidic chips,researchers have developed the microfluidic SERS chips which expand the function of microfluidic chips and provide an efficient platform for on-site biochemical analysis equipped with the powerful sensing capability of SERS *** this paper,we will first briefly give a review of the current microfluidic SERS-active substrates preparation technology and present the perspective on the application prospects of microfluidic SERS-active *** then the challenges in the preparation of microfluidic SERS-active substrates will be pointed out,as well as realistic issues of using this technology for biochemical application.

关键词： SERS substrate Microfluidics Biochemical sensing On-site analysis

Applicability of Parametrized Form of Fully Dressed Quark Propagator

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Communications in Theoretical Physics 2006年第4期45卷 675-680页

作者： ZHOU Li-Juan ma Wei-xing Collaboration Group of Hadron Physics and Non-perturbative QCD Study Guangxi University of Technology Liuzhou 545006 China College of Physical Science and Engineering Technology Guangxi University Nanning 530004 China Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100049 China

According to extensive study of the Dyson-Schwinger equations for a fully dressed quark propagator in the ＂rainbow＂ approximation with an effective gluon propagator, a parametrized fully dressed confining quark propagator is suggested in this paper. The parametrized quark propagator describes a confined quark propagation in hadron, and is analytic everywhere in complex p^2-plane and has no Lehmann representation. The vector and scalar self-energy functions [1 - Af（p^2）] and [Bf（p^2） - mf], dynamlcally running effective mass of quark Mf（p^2） and the structure of non-local quark vacuum condensates as well as local quark vacuum condensates are predicted by use of the parametrized quark propagator. The results axe compatible with other theoretical calculations,

关键词： quark propagator Dyson-Schwinger equations non-perturbative QCD

Dual Control Methods for a Mixed Control Problem with Optimal Stopping Arising in Optimal Consumption and Investment

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Numerical mathematics(Theory,Methods and Applications) 2022年第3期15卷 641-661页

作者： Jingtang ma Jie xing Shan Yang School of mathematics Southwestern University of Finance and EconomicsChengdu 611130China Guiyang Institute for Big Data and Finance Guizhou University of Finance and EconomicsGuiyang 550025China

This paper studies a problem of optimal investment and consumption with early retirement option under constant elasticity variation(CEV)model with finite *** risky assets are involved in the model with one following geometric Brownian motion and the other a CEV *** problem is a kind of two dimensional mixed control and optimal stopping problems with finite *** existence and continuity of the optimal retirement threshold surfaces are proved and the working and retirement regions are characterized ***-squares Monte-Carlo methods are developed to solve this mixed control and optimal stopping *** algorithms are well implemented and the optimal retirement threshold surfaces,optimal investment strategies and the optimal consumptions are drawn via examples.

关键词： Optimal investment and consumption stochastic control with optimal stopping nonlinear free boundary problems least-squares Monte-Carlo methods

Survival Probability of Population-size-dependent Branching Processes in Random Environments

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Acta mathematicae Applicatae Sinica 2016年第2期32卷 477-484页

作者： Shi-xia ma Xiao-yu xing School of Sciences Hebei University of Technology

The class of population-size-dependent branching processes in independent identically distributed random environments is investigated. Under the critical case and appropriate moment assumption, we establish an asympto... 详细信息

关键词： branching processes population-size-dependent processes random environments survival proba-bility

A new scheme for identifying free surface particles in improved SPH

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Science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1454-1463页

作者： ZHENG xing DUAN WenYang ma QingWei College o(Shipbuilding Engineering Harbin Engineering University Harbin 150001 China Schools of Engineering and mathematical Science City University London EC1 V OHB UK

The present paper proposes a new scheme for identifying free surface particles in an improved SPH (Smoothed Particle Hydrodynamics). With the development of the SPH, free surface identification becomes a key challenge in free surface flow simulations, especially for violent breaking water waves. According to numerical tests, existing free surface identified schemes are not reliable for weakly compressible SPH when violent waves are modeled. The new free surface identification scheme suggested here considers changes in density ratio and three auxiliary functions. Although this new scheme originates from a scheme for another meshfree method (MLPG_R method), it includes several improvements, especially developed for the improved SPH. The limited numerical tests have indicated that the scheme does not significantly increase CPU time required, but it considerably improves the identification of free surface particles.

关键词： meshfree method SPH free surface identification scheme improved SPH

Tensor semantic model for an audio classification system

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Science China(Information Sciences) 2013年第6期56卷 106-114页

作者： xing Ling ma Qiang ZHU Min School of Information Engineering Southwest University of Science and Technology

Audio resources are a very important part of multimedia *** classification effect of audio is directly related to the service mode of personal resource management *** present,vector features have been widely used in audio classification ***,some semantic correlations among different audio information can not be completely expressed by simple vector *** are multidimensional matrices,and their mathematical expansion and application can express multi-semantic *** tensor uniform content locator(TUCL) is proposed as a means of expressing the semantic information of audio,and a three-order tensor semantic space is constructed according to the semantic *** semantic dispersion(TSD) can aggregate some audio resources with the same semantics and,at the same time,its automatic classification can be accomplished by calculating the *** order to effectively utilize TSD classification information,a radial basis function tensor neural network(RBFTNN) is constructed and used to train an intelligent learning *** results show that the tensor model can significantly improve the classification precision under multi-semantic classification requests within an information resource management system.

关键词： audio classification tensor semantic dispersion tensor uniform content locator

Microblog User Recommendation Based on Particle Swarm Optimization

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China Communications 2017年第5期14卷 134-144页

作者： Ling xing Qiang ma Ling Jiang School of Information Engineering Henan University of Science and Technology School of Information Engineering Southwest University of Science and Technology School of mathematics Science and Computer Wuyi UniversityWuyishan

Considering that there exists a strong similarity between behaviors of users and intelligence of swarm of agents,in this paper we propose a novel user recommendation strategy based on particle swarm optimization(PSO)for Microblog network. Specifically,a PSO-based algorithm is developed to learn the user influence,where not only the number of followers is incorporated,but also the interactions among users(e.g.,forwarding and commenting on other users' tweets). Three social factors,the influence and the activity of the target user,together with the coherence between users,are fused to improve the performance of proposed recommendation strategy. Experimental results show that,compared to the well-known Page Rank-based algorithm,the proposed strategy performs much better in terms of precision and recall and it can effectively avoid a biased result caused by celebrity effect and zombie fans effect.

关键词： particle swarm optimization Microblog social network user recommendation user influence

Strange Meson Photo-production and Its Associated Radiative Capture on Proton in Low-Energy QCD Lagrangian

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Communications in Theoretical Physics 2006年第3X期46卷 493-500页

作者： ZHOU Li-Juan ma Wei-xing Collaboration Group of Hadron Physics and Non-perturbative QCD Study Guangxi University of Technology Liuzhou 545006 China Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918 Beijing 100049 China

Based on the low energy QCD Lagrangian theory and the crossing symmetry relation, strange meson photoproduction and its associated radiative capture on the proton are investigated in the [SUSF（6） × O（3）]sym . × SUc（3） quark mode/of baryon structure with only one same input parameter, the only strong coupling constant aM. Calculations for the cross sections, p-polarization of γ ＋ P → K^＋＋ A reaction and the branching ratios for K^- radiative capture of K^- ＋ p →　γ ＋ Y with Y = A, ∑^0 are performed. Good agreements to data are obtained and the results show that, compared to traditional phenomenological models, the low energy QCD Lagrangian theory provides a successful, unifled description of the strange meson photo-production and its associated radiative capture.

关键词： low-energy QCD Lagrangian quarks and gluons quark structure of baryon strange meson photoproduction K^- meson radiative capture

Highly active Pd-Fe/α-Al_(2)O_(3) catalyst with the bayberry tannin as chelating promoter for CO oxidative coupling to diethyl oxalate

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Chinese Chemical Letters 2021年第2期32卷 796-800页

作者： Wei-Chao xing Ji-Min An Jing Lv Faisal Irshad Yu-Jun Zhao sheng-Ping Wang Xin-Bin ma Key Laboratory for Green Chemical Technology School of Chemical Engineering and TechnologyTianjin UniversityCollaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China

A novel Pd-Fe/α-Al_(2)O_(3) catalyst was synthesized by incipient-wetness impregnation method with bayberry tannin as chelating promoter and commercial hollow column Raschig ring a-Al_(2)O_(3) as support for the synthesis of diethyl oxalate from CO and ethyl nitrite.A variety of characterization techniques including N2 physical adsorption,optical microscopy,scanning electron microscopy and energy dispersive system(SEM-EDS),inductively coupled plasma optical emission spectroscopy(ICP-OES),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),were employed to explore the relationship between the physicochemical properties and activity of *** indicated that a large number of phenolic hydroxyl groups in bayberry tannin can efficiently anchor the active component Pd,reduce the particle size and make the active Pd as a multi-ring distribution on the commercial a-Al2O3 suppo rt,which we re beneficial to improve the catalytic activity for the production of diethyl oxalate from CO and ethyl nitrite.0.3 wts Pd-Fe/α-Al_(2)O_(3) showed excelle nt catalytic activity and selectivity in a continuous flow,fixed-bed reactor with the loading amount of 10 mL catalysts,Under the mild reaction conditions,the space-time yield of diethyl oxalate was 978 g L^(-1) h^(-1) and CO conversion was 44% with the selectivity to diethyl oxalate of 95.5%.

关键词： Bayberry tannin Diethyl oxalate Phenolic hydroxyl groups Ethyl nitrite Pd-Fe/α-Al_(2)O_(3)