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Solutions for a class of Hamiltonian systems on time scales with non-local boundary conditions

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Applied Mathematics and Mechanics(English Edition) 2022年第4期43卷 587-602页

作者： Yongfang wei Suiming shang Zhanbing BAI College of Mathematics and System Science Shandong University of Science and TechnologyQingdao 266590Shandong ProvinceChina

In this work,the solvability of a class of second-order Hamiltonian systems on time scales is generalized to non-local boundary *** measurements obtained by non-local conditions are more accurate than those given by local conditions in some *** with the known results,this work establishes the variational structure in an appropriate Sobolev’s ***,by applying the mountain pass theorem and symmetric mountain pass theorem,the existence and multiplicity of the solutions are ***,some examples with numerical simulation results are given to illustrate the correctness of the results obtained.

关键词： Hamiltonian system non-local boundary condition time scale variational structure critical point theory

HETEROGENEITY, NONLINEARITY AND ENDOGENOUS MARKET VOLATILITY

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Journal of Systems Science & Complexity 2011年第6期24卷 1130-1142页

作者： Hongquan LI Shouyang WANG wei shang School of Business Hunan Normal University Changsha 410081 China Academy of Mathematics and Systems Sciences Chinese Academy of Sciences Beijing 100190 China

This paper aims to contribute to the literature on the explanatory power of behavior models with heterogeneous agents. The authors present a new nonlinear structural stock market model which is a nonlinear deterministic process buffeted by dynamic noise. An exogenous noise is introduced to the model with the assumption of IID normal innovations of the fundamental value in order to investigate how noisy dynamics interacts with deterministic process. The market is composed of two typical trader types： the rational fundamentalists and the boundedly rational traders governed by greed and fear. The interaction between noise and deterministic element determines the evolution process of the system as key parameters are changed. The authors find the model is able to generate time series that exhibit dynamical and statistical properties closely resembling those of the S＆：P500 index, such as volatility clustering, fat tails （leptokurtosis）, autocorrelation in square and absolute return, larger amplitude, crashes and bubbles. The authors also investigate the nonlinear dependence structure in our data. The results indicate that the GARCH-type model cannot completely account for all nonlinearity in our simulated market, which is thus consistent with the results from real markets. It seems that the nonlinear structural model is more powerful to give a satisfied explanation to market behavior than the traditional stochastic approach.

关键词： Computational finance endogenous volatility heterogeneous agents noisy chaos nonlinearity stylized facts.

IL-21 acts as a promising therapeutic target in systemic lupus erythematosus by regulating plasma cell differentiation

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Cellular & Molecular Immunology 2015年第1期12卷 31-39页

作者： Xiao-Mei Deng shang-Xue Yan wei wei Institute of Clinical Pharmacology of Anhui Medical University Key Laboratory of Anti-inflammatory and Immune Medicine Ministry of Education HefeiChina

Plasma cells, which secrete auto-antibodies, are considered to be the arch-criminal of autoimmune diseases such as systemic lupus erythematosus, but there are many cytokines involved in inducing the differentiation of B-cell subsets into plasma cells. Here, we emphasize IL-21, which has emerged as the most potent inducer of plasma cell differentiation. In this review, we focused on the promoting effects of IL-21 on plasma cell differentiation and discuss how these effects contribute to B cell-mediated autoimmune disease.

关键词： Bcl-6 Blimp-1 IL-21 plasma cell systemic lupus erythematosus

Design of digital calibration based on variable step size of sub-binary SAR ADC

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The Journal of China Universities of Posts and Telecommunications 2024年第2期31卷 62-71页

作者： Liu wei Zhao Yanke shang Shiguang School of Electronic Engineering Xi'an University of Posts and TelecommunicationsXi'an 710121China

Addressing the impact of capacitor mismatch on the conversion accuracy of successive approximation register analog-to-digital converter(SAR ADC),a 12-bit 1 MS/s sub-binary SAR ADC designed using variable step size digital calibration was *** least mean square(LMS)calibration algorithm was employed with a ramp signal used as the calibration *** errors,extracted under injected disturbances,underwent iterative training to optimize weight *** address the trade-off between conversion accuracy and speed caused by a fixed step size,a novel variable step size algorithm tailored for SAR ADC calibration was *** core circuit and layout of the SAR ADC were implemented using the Taiwan Semiconductor Manufacturing Company(TSMC)0.35μm complementary metal-oxide-semiconductor(CMOS)commercial *** of the SAR ADC calibration algorithm was conducted using Simulink,demonstrating quick convergence and meeting conversion accuracy requirements compared to fixed step size *** results indicated that the convergence speed of the LMS digital calibration algorithm with variable step size was approximately eight times faster than that with a fixed step size,also yielding a lower mean square error(MSE).After calibration,the simulation results for the SAR ADC exhibited an effective number of bit(ENOB)of 11.79 bit and a signal-to-noise and distortion ratio(SNDR)of 72.72 dB,signifying a notable enhancement in the SAR ADC performance.

关键词： successive approximation register analog-to-digital converter(SAR ADC) variable step size digital calibration disturbance technique

Sub-10 nm lanthanide-doped SrFCl nanoprobes:Controlled synthesis,optical properties and bioimaging

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Journal of Rare Earths 2019年第7期37卷 691-698页

作者： Jiaojiao wei wei Lian wei Zheng Xiaoying shang Meiran Zhang Tao Dai Xueyuan Chen College of Chemistry Fuzhou UniversityFuzhou 350116China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Alkaline-earth dihalide nanocrystals(NCs) such as SrFCl, owing to their high chemical stability and low phonon energy, are excellent host materials for lanthanide(Ln3+) doping to achieve desirable optical properties for various bioapplications, Herein, we report a novel strategy for the synthesis of sub-10 nm Ln3+-doped SrFCl NCs with efficient upconverting and downshifting luminescence through a facile onestep hot-injection method. Utilizing the temperature-dependent upconverting luminescence(UCL) from the thermally coupled 2H11/2 and 4S3/2 levels of Er3+, we showed the potential of SrFCl:Yb,Er NCs as sensitive UCL nanoprobes for non-contact thermal sensing with a maximum detection sensitivity of 0.0066 K-1, which is among the highest values for thermal sensing based on Er3+-activated UCL nanoprobes. Furthermore, by employing the intense downshifting luminescence from Tb3+ and Eu3+, we demonstrated the successful use of biotinylated SrFCl:Ce,Tb and SrFCl:Eu3+ nanoprobes for biotin receptor-targeted cancer cell imaging, thus revealing the great promise of SrFCl:Ln3+ nanoprobes for versatile bioapplications.

关键词： Lanthanide SrFCl nanocrystals Upconverting luminescence Thermal sensing Bioimaging Rare earths

Two-Level Linear Relaxation Method for Generalized Linear Fractional Programming

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Journal of the Operations Research Society of China 2023年第3期11卷 569-594页

作者： Hong-wei Jiao You-Lin shang Postdoctoral Research Base Henan Institute of Science and TechnologyXinxiang453003HenanChina Postdoctoral Research Station of Control Science and Engineering Henan University of Science and TechnologyLuoyang471023HenanChina

This paper presents an efficient algorithm for globally solving a generalized linear fractional programming *** establishing this algorithm,we firstly construct a two-level linear relaxation method,and by utilizing the method,we can convert the initial generalized linear fractional programming problem and its subproblems into a series of linear programming relaxation *** on the branch-and-bound framework and linear programming relaxation problems,a branch-and-bound algorithm is presented for globally solving the generalized linear fractional programming problem,and the computational complexity of the algorithm is ***,numerical experimental results demonstrate the feasibility and efficiency of the proposed algorithm.

关键词： Generalized linear fractional programming Global optimization Two-level linear relaxation method Branch-and-bound

Sub-optimal fixed-finite-horizon spacecraft configuration control on SE(3)

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Chinese Journal of Aeronautics 2022年第6期35卷 250-261页

作者： Yulin WANG wei shang Haichao HONG Institute of Remote-sensing Satellite China Academy of Space TechnologyBeijing 100094China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068China Institute of Flight System Dynamics Technical University of MunichGarching 85748Germany

For achieving the desired configuration of spacecraft at the desired fixed time,a suboptimal fixed-finite-horizon configuration control method on the Lie group SE(3)is developed based on the Model Predictive Static Programming(MPSP).The MPSP technique has been widely used to solve finite-horizon optimal control problems and is known for its high computational efficiency thanks to the closed-form solution,but it cannot be directly applied to systems on SE(3).The methodological innovation in this paper enables that the MPSP technique is extended to the geometric control on SE(3),using the variational principle,the left-invariant properties of Lie groups,and the topology structure of Lie algebra ***,the energy consumption,which is crucial for spacecraft operations,is considered as the objective function to be optimized in the optimal control *** effectiveness of the designed sub-optimal control method is demonstrated through an online simulation under disturbances and state measurement errors.

关键词： Configuration control Lie groups Model Predictive Static Programming Optimal control Spacecraft control

One-Way Quantum Authenticated Secure Communication Using Rotation Operation

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Communications in Theoretical Physics 2011年第12期56卷 1023-1026页

作者： Chia-wei Tsai Toung-shang wei Tzonelih Hwang Department of Computer Science and Information Engineering National Cheng Kang University

This study proposes a theoretical quantum authenticated secure communication(QASC) protocol using Einstein-Podolsky-Rosen(EPR) entangle state,which enables a sender to send a secure as well as authenticated message to a receiver within only one step quantum transmission without having the classical channels and the certification authority.

关键词： quantum authentication quantum direct communication

EFFECT OF H^(+)-IONS IMPLANTATION AND Ar^(+)-IONS BOMBARDMENT ON THE PROPERTIES OF LiNbO_(3) CRYSTAL SURFACES

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Chinese Physics Letters 1989年第2期6卷 72-75页

作者： FENG Xiqi shang wei shanghai Institute of Ceramics Academia SinicaShanghai

The H^(+)-ions implantation and Ar^(+)-ions bombardment did not cause near-surface decomposition of LiNbO_(3),but it resulted in the alteration of the physical *** XPS(x-ray photoelectron energy spectroscopy)measureme... 详细信息

关键词： properties. implantation SURFACE