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Analyses of β-Bands of 230,232Th and 232,234U by the Projected Shell Model

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Chinese Physics Letters 2012年第2期29卷 59-62页

作者： CUI Ji-Wei ZHOU Xian-Rong chen fang-qi SUN Yang WU cheng-Li Department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen UniversityXiamen 361005 Department of Physics and Institute of nuclear particleastronomy and cosmologyShanghai Jiao Tong UniversityShanghai 200240

The ground bands and β-bands of four nuclei 230,232Th and 232,234U in the actinide region are investigated by introducing a collective Do pair into the projected shell *** discuss the collectivity of the Do *** calcu... 详细信息

关键词： bands collective model

Level Statistics for the Nilsson Single-Particle Levels

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Chinese Physics Letters 2010年第3期27卷 52-55页

作者：陈芳祁周先荣顾建中 Department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen University Xiamen 361005 China Institute of Atomic Energy P.O. Box 275(18) Beijing 102413

We perform level statistics of the Nilsson single-particle levels. The effects of the l2 and l ＆#12539; s; s terms are discussed as well as their interplay with the deformations. The results show that when the l2 term is added to the harmonic oscillator potential, chaotic motion occurs. The strength ranges of the l2 term in which chaotic motion exists are related to the deformation of the harmonic oscillator potential. The calculations of the localization length in different bases demonstrate that it is the spherical or axial symmetries that govern the chaotic motion. The degree of chaoticity increases significantly with the l ＆#12539; s; s term included.

关键词： Periodicity Statistics Levels

The Existence of Solutions of Initial Value Problems for Nonlinear Second Order Impulsive Integro-Differential Equations of Mixed Type in Banach Spaces

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Journal of Mathematical Research and Exposition 2008年第3期28卷 501-510页

作者： YU Wei qin chen fang qi Department of Mathematics Nanjing University of Aeronautics and Astronautics Jiangsu 210016 China

By the use of MSnch fixed point theorem and a new comparison result, the solutions of initial value problems for nonlinear second order impulsive integro-differential equations of mixed type in Banach spaces are inves... 详细信息

关键词： Banach spaces impulsive integro-differential equations initial value problems measure of noncompactness cone.

Effects of lower fluence pulsed dye laser irradiation on production of collagen and the mRNA expression of collagen relative gene in cultured fibroblasts in vitro

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Chinese Medical Journal 2006年第18期119卷 1543-1547页

作者： YU Hai-yan chen Da-fang WANG qi chenG Hao Department of Dermatology Sir Run Run Shaw Hospital of Zhejiang University Hangzhou 310016 China

Background Lower fluence of 585-nm flashlamp-pumped pulsed dye laser has been successfully used as a nonablative technique in the treatment of wrinkles. The objective of this study was to evaluate the effect of the pulsed dye laser （585 nm） on the production of collagen and the mRNA expression of collagen related gene in fibroblasts in vitro. Methods Cultured fibroblasts were treated with a 585-nm flashlamp-pumped pulsed dye laser （ fluence 3 J/cm^2, 4 J/cm^2, spot size 7 mm, pulse duration 450 12s）. The production of collagen and the mRNA expression of transforming growth factor （TGF）-β1, SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen α1, α2 in fibroblasts were investigated by colorimetry or real time polymerase chain reaction. Results The production of collagen was significantly up-regulated after treatment with a 585-nm flashlamp-pumped pulsed dye laser with a fluence of 3 J/cm^2 （P 〈0.001）. The mRNA expression of TGF- β1, SMAD2, SMAD3, SMAD4, SMAD7 and procollagen I was significantly up-regulated after treatment with a 585-nm flashlamp-pumped pulsed dye laser with a fluence of 3 J/cm^2 （P 〈0.001）. No significant difference of mRNA expression of SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen was found between controls and fibroblasts treated with pulsed dye laser with a fluence of 4 J/cm^2 （P 〉0.05）. Conclusions Lower fluence （3 J/cm^2） pulsed dye laser increased the collagen production in fibroblasts by up-regulating TGF-β1, SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen mRNA expression. These may be the reason it can be effectively used in the treatment of wrinkles.

关键词： pulsed dye laser fibroblasts procollagen SMADs

Development of Projected Shell Model and Description of Low-lying Collective States in Transitional Nuclei

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Development of Projected Shell Model and Description of Low-...

CHAOTIC MOTIONS FOR A NONLINEAR MODEL OF A COUPLED PITCH-ROLL SHIP

作者： chen fang-qi SUN Yang Department of Nuclear Physics Department of Physics and Astronomy Shanghai Jiao Tong University

Description of the interplay between different nuclear shapes is an interesting but challenging *** original projected shell model(PSM)is applicable to nuclei with fixed *** extend the PSM by superimposing(angular-mom...

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CHAOTIC MOTIONS FOR A NONLINEAR MODEL OF A COUPLED PITCH-ROL...

Research of the lowest two Kπ=0+ bands in neutron deficient Pt and Hg isotopes using PSM-based Generator Coordinate Method

第十届动力学与控制学术会议

作者： ZHOU Liang-qiang chen fang-qi College of Science Nanjing University of Aeronautics and Astronautics

Global bifurcations and chaotic motions for a nonlinear model of a coupled pitch-roll ship are investigated both analytically and numerically in this paper. Using the symplectic transformation, the dynamic model is rewritten as a quasi integrable Hamilton system. The expressions of the heteroclinic orbits are obtained, and chaotic motions arising from the intersections of the stable and unstable manifold of the heteroclinic orbits are investigated with Melnikov method. The parameter conditions for chaotic motions are obtained. The critical curves separating the chaotic and non-chaotic motions are presented. Numerical simulations are also given, which verify the analytical results.

关键词： ship pitch-roll Melnikov method chaos heteroclinic orbits

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Research of the lowest two Kπ=0+ bands in neutron deficient...

Ammonia pyrolysis oxidation excited by nanosecond pulsed discharge:Global/fluid models hybrid solution

第十五届全国核结构大会

作者： chen fang-qi GAO Zao-Chun SUN Yang Department of Nuclear Physics China Institute of Atomic Energy Department of Physics and Astronomy Shanghai Jiao Tong University

The Projected Shell Model has been developed by including various intrinsic deformations in the configuration *** this new method,the quadrupole deformation parameter ε2 is taken as the generator *** apply this PSM-based Generator Coordinate Method(GCM)to investigate the intrinsic structures of the Kπ=0+yrast and yrare bands in even-even nuclei 17684Pt and *** the Pt isotopes,our calculations show that the yrast bands are prolate,while the yrare bands are beta-vibrations on top of the yrast ***,in the Hg isotopes,the intrinsic structures of the rotational bands are more *** the low-spin region,the yrast states are superpositions of both oblate shape and prolate shape,but their quadrupole moments are *** differently,the low-spin yrare states have large prolate *** the spin increases,these two bands cross(at spin 2h),so the yrast states become well deformed *** have also calculated the electromagnetic properties for both isotopic *** rapid changes of B(E2)values along the yrast bands have been well *** calculated g-factors of the first 2+states in Pt isotopes are also in good agreement with the observed *** can be concluded that the Pt and Hg isotopes studied can be described within the axially symmetric GCM calculation.

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Journal of Energy Chemistry 2025年第1期100卷 385-396页

作者： Mingming Zhang Hanyu Wu qi chen Jiaxin Yang Bonan Liu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University China University of Petroleum

The kinetic characteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using the global/fluid models hybrid solution ***,the stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results show that the consumption of NH3/O2and the production of N2/H2change linearly with the increase of voltage,which indicates the decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,the detailed reaction kinetics mechanism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on the reaction path analysis,the simplified mechanism is *** detailed and simplified mechanism simulation results are compared with experimental data to verify the accuracy of the simplified ***,based on the simplified mechanism,the fluid model of ammonia oxidative pyrolysis stimulated by the nanosecond pulse plasma is established to study the pre-sheath/sheath behavior and the resultant consumption and formation of key *** results show that the generation,development,and propagation of the pre-sheath have a great influence on the formation and consumption of *** consumption of NH3by the cathode pre-sheath is greater than that by the anode pre-sheath,but the opposite is true for OH and O（1S）.However,within the sheath,almost all reactions do not ***,by changing the parameters of nanosecond pulse power supply voltage,it is found that the electron number density,electron current density,and applied peak voltages are not the direct reasons for the structural changes of the sheath and ***,the discharge interval has little effect on the sheath structure and gas mixture *** research results of this paper not only help to understand the kinetic promotion of non-equilibrium excitation in the process of oxidative pyrolysis but also help to explore th

关键词： Nanosecond pulsed discharge Ammonia Oxidative pyrolysis Fluid model Global model

Inexact proximal gradient algorithm with random reshuffling for nonsmooth optimization

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Science China(Information Sciences) 2025年第1期68卷 219-237页

作者： Xia JIANG Yanyan fang Xianlin ZENG Jian SUN Jie chen National Key Lab of Autonomous Intelligent Unmanned Systems School of AutomationBeijing Institute of Technology Beijing Institute of Technology Chongqing Innovation Center School of Electronic and Information Engineering Tongji University

Proximal gradient algorithms are popularly implemented to achieve convex optimization with nonsmooth regularization. Obtaining the exact solution of the proximal operator for nonsmooth regularization is challenging because errors exist in the computation of the gradient; consequently, the design and application of inexact proximal gradient algorithms have attracted considerable attention from researchers. This paper proposes computationally efficient basic and inexact proximal gradient descent algorithms with random reshuffling. The proposed stochastic algorithms take randomly reshuffled data to perform successive gradient descents and implement only one proximal operator after all data pass through. We prove the convergence results of the proposed proximal gradient algorithms under the sampling-without-replacement reshuffling *** computational errors exist in gradients and proximal operations, the proposed inexact proximal gradient algorithms can converge to an optimal solution neighborhood. Finally, we apply the proposed algorithms to compressed sensing and compare their efficiency with some popular algorithms.

关键词： proximal operator random reshuffling inexact computation compressed sensing nonsmooth optimization