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Recent progress on dense nuclear matter in skyrmion approaches

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Science China(Physics,Mechanics & Astronomy) 2017年第3期60卷 1-24页

作者： yong liang Ma Mannque Rho Center of Theoretical Physics and College of Physics Jilin University Institut de Physique Th'eorique CEA Saclay

The Skyrme model provides a novel unified approach to nuclear physics. In this approach, single baryon, baryonic matter and medium-modified hadron properties are treated on the same footing. Intrinsic density dependence(IDD) reflecting the change of vacuum by compressed baryonic matter figures naturally in the approach. In this article, we review the recent progress on accessing dense nuclear matter by putting baryons treated as solitons, namely, skyrmions, on crystal lattice with accents on the implications in compact stars.

关键词： Skyrme model hidden symmetries skyrmion crystal holographic nucleon BPS nuclei compact stars

Ranking approach of cross-efficiency based on improved TOPSIS technique

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Journal of Systems Engineering and Electronics 2011年第4期22卷 604-608页

作者： Jie Wu Jiasen Sun yong Zha liang liang School of Management University of Science and Technology of China Hefei 230026 R R. China

The cross-efficiency evaluation method is reviewed which is developed as a data envelopment analysis （DEA） extensive tool. The cross-efficiency evaluation method is utilized to identify the decision making unit （DMU） with the best practice and to rank the DMUs by their respective cross-efficiency scores. The main drawbacks of the cross-efficiency evaluation method when the ultimate average cross-efficiency scores are used to evalu- ate and rank the DMUs are also pointed out. With the research gap, an improved technique for order preference by similarity to ideal solution （TOPSIS） is introduced to rank the crossfficiency by eliminating the average assumption. Finally, an empirical example is illustrated to examine the validity of the proposed method.

关键词： data envelopment analysis (DEA) cross-efficiency,improved technique for order preference by similarity to ideal solu-tion (TOPSIS) decision making unit (DMU).

Vector meson effects on multi-Skyrmion states from the rational map ansatz

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Science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 126-135页

作者： Jun-Shuai Wang yong-liang Ma College of Physics Jilin UniversityChangchun130012China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences(UCAS)Hangzhou310024China TaiJi Laboratory for Gravitational Wave Universe(Beijing/Hangzhou) UCASBeijing100049China

The roles of the lightest vector mesons ρ and ω in the multi-Skyrmion states are studied using the hidden local symmetry approach up to the next-to-leading order,including the homogeneous Wess-Zumino *** low-energy constants in the effective field theory are determined using the Sakai-Sugimoto model and the flat-space five-dimensional Yang-Mills *** only two inputs,m_(ρ) and f_(π),it is possible to determine all low-energy constants without *** vector meson effects can be investigated by sequentially integrating vector mesons,and their geometry can be elucidated by comparing the results using the low-energy constants estimated from the Sakai-Sugimoto model and the flat-space five-dimensional Yang-Mills *** found that theρmeson reduces the masses of the multi-Skyrmion states and increases the overlaps of their constituents,whereas theωmeson repulses the constituents of the multi-Skyrmion states and increases their ***,these vector mesons are crucial in the Skyrme model approach to *** also found that the warping factor,an essential element in the holographic model of QCD,affects the properties of the multi-Skyrmion states and cannot be ignored.

关键词： vector meson multi-Skyrmion state rational map hidden local symmetry

Interactive modeling of lofted shapes from a single image

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Computational Visual Media 2020年第3期6卷 279-289页

作者： Congyue Deng Jiahui Huang yong-liang Yang Tsinghua University Beijing100084China University of Bath BathBA27AYUK

Modeling the complete geometry of general shapes from a single image is an ill-posed *** hints are often incorporated to resolve ambiguities and provide guidance during the modeling process. In this work, we present a novel interactive approach for extracting high-quality freeform shapes from a single image. This is inspired by the popular lofting technique in many CAD systems, and only requires minimal user input. Given an input image, the user only needs to sketch several projected cross sections, provide a"main axis", and specify some geometric relations. Our algorithm then automatically optimizes the common normal to the sections with respect to these constraints,and interpolates between the sections, resulting in a high-quality 3 D model that conforms to both the original image and the user input. The entire modeling session is efficient and intuitive. We demonstrate the effectiveness of our approach based on qualitative tests on a variety of images, and quantitative comparisons with the ground truth using synthetic images.

关键词： image User sketch

Experimental Investigation of the Mg–Zn–Zr Isothermal Section at 400 °C

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Acta Metallurgica Sinica(English Letters) 2019年第4期32卷 426-432页

作者： yong-Peng liang Shu-Hong Liu Kai Xu yong Du State Key Lab of Powder Metallurgy Central South University School of Materials Science and Engineering Central South University

Mg-Zn-Zr series Mg alloys(ZK) are one of the most important commercial Mg alloys due to their good comprehensive mechanical properties. The phase equilibria of the Mg-Zn-Zr system at 400 ℃ covering the overall composition range were investigated by X-ray diffraction and electron probe microanalyses on thirteen ternary alloys. Three ternary compounds, τ_1, τ_2 and τ_3, were detected to be thermodynamically stable at 400 ℃, and their homogeneity range was determined to be Mg_((7-17))Zn_((80-88))Zr_((4-6)), Mg_((15-22))Zn_((66-65))Zr_((9-16)) and Mg_9 Zn_(68)Zr_(23)(in at.%), respectively. Eight three-phase regions and four two-phase regions were observed. The maximum solubility of Mg in Zn_(22) Zr, Zn_(39) Zr_5 and Zn_3 Zr phases was measured to be 0.52, 0.37 and 0.99 at.%, respectively, while the solubility of Zr in MgZn_2 and Mg_2 Zn_3 phases is negligible. The isothermal section of the Mg-Zn-Zr system at 400 ℃ was then constructed based on the present experimental data.

关键词： Mg–Zn–Zr Isothermal section Phase equilibria Ternary compounds

Anonymisierungstechnik in der schriftlichen Fachkommunikation

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外语教学 1989年第1期10卷 37-46页

作者： liang yong

隐名化是专业语言句法和修辞领域里的一项重要手段。在专业文献所传播的信息中,占主导地位的是有关的事或物,所以,狭义的人称形式往往不出现。此外,专业文献的作者为了强调所述内容的客观性和普遍性,常常故意避免使用主格人称。这两种... 详细信息

隐名化是专业语言句法和修辞领域里的一项重要手段。在专业文献所传播的信息中,占主导地位的是有关的事或物,所以,狭义的人称形式往往不出现。此外,专业文献的作者为了强调所述内容的客观性和普遍性,常常故意避免使用主格人称。这两种隐名形式与专业领域里的特殊的思维方式有着密切的联系。本文以1139个德语单句为研究对象,对隐名化手法作了质和量两个方面的抽样分析,并以大量的实例较为详尽地论述了隐名化手法的各种不同的变体及其在书面语言交际中的功能。

关键词：专业语言思维方式修辞语言交际句法抽样分析主格德语专业文献主导地位

Multi-agent graphical games with input constraints:an online learning solution

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Control Theory and Technology 2020年第2期18卷 148-159页

作者： Tianxiang WANG Bingchang WANG yong liang School of Control Science and Engineering Shandong UniversityJinan Shandong 250061China

This paper studies an online iterative algorithm for solving discrete-time multi-agent dynamic graphical games with input *** order to obtain the optimal strategy of each agent,it is necessary to solve a set of coupled Hamilton-Jacobi-Bellman(HJB)*** is very difficult to solve HJB equations by the traditional *** relevant game problem will become more complex if the control input of each agent in the dynamic graphical game is *** this paper,an online iterative algorithm is proposed to find the online solution to dynamic graphical game without the need for drift dynamics of ***,this algorithm is to find the optimal solution of Bellman equations *** solution employs a distributed policy iteration process,using only the local information available to each *** can be proved that under certain conditions,when each agent updates its own strategy simultaneously,the whole multi-agent system will reach Nash *** the process of algorithm implementation,for each agent,two layers of neural networks are used to fit the value function and control strategy,***,a simulation example is given to show the effectiveness of our method.

关键词： Actor-critic algorithm differential games input constraints neural network(NN) reinforcement learning(RL)

A Geometric Based Connection between Fractional Calculus and Fractal Functions

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Acta Mathematica Sinica,English Series 2024年第2期40卷 537-567页

作者： yong Shun liang Wei Yi SU School of Mathematics and Statistic Nanjing University of Science and TechnologyNanjing 210094P.R.China Department of Mathematics Nanjing UniversityNanjing 210023P.R.China

Establishing the accurate relationship between fractional calculus and fractals is an important research content of fractional calculus *** the present paper,we investigate the relationship between fractional calculus and fractal functions,based only on fractal dimension *** dimension of the Riemann-Liouville fractional integral of continuous functions seems no more than fractal dimension of functions *** fractal dimension of the Riemann-Liouville fractional differential of continuous functions seems no less than fractal dimension of functions themselves when they *** further discussion,fractal dimension of the Riemann-Liouville fractional integral is at least linearly decreasing and fractal dimension of the Riemann-Liouville fractional differential is at most linearly increasing for the Holder continuous *** about other fractional calculus,such as the Weyl-Marchaud fractional derivative and the Weyl fractional integral has also been given *** work is helpful to reveal the mechanism of fractional calculus on continuous *** the same time,it provides some theoretical basis for the rationality of the definition of fractional *** is also helpful to reveal and explain the internal relationship between fractional calculus and fractals from the perspective of geometry.

关键词： Fractional calculus fractal functions fractal dimension fractional calculus equation relationship

Numerical study of hydrodynamic behavior and conversion efficiency of a two-buoy wave energy converter

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Journal of Hydrodynamics 2018年第2期30卷 235-248页

作者： Cen Yang yong-liang Zhang State Key Laboratory of Hydro-Science and Engineering Tsinghua University Beijing 100084 China

In this paper we propose a two-buoy wave energy converter composed of a heaving semi-submerged cylindrical buoy, a fixed submerged cylindrical buoy and a power take-off（PTO） system, and investigate the effect of the fixed submerged buoy on the hydrodynamics of the heaving semi-submerged buoy based on the three-dimensional potential theory. And the dynamic response of the semi-submerged buoy and the wave energy conversion efficiency of the converter are analyzed. The difference of the hydrodynamics and the wave energy conversion efficiency of a semi-submerged buoy converter with and without a fixed submerged buoy is discussed. It is revealed that the influence of the fixed submerged buoy on the exciting wave force, the added mass, the radiation damping coefficient and the wave energy conversion efficiency can be significant with a considerable variation, depending on the vertical distance between the heaving semi-submerged buoy and the fixed submerged buoy, the diameter ratio of the fixed submerged buoy to the heaving semi-submerged buoy and the water depth.

关键词： Wave energy converter two-buoy hydrodynamics conversion efficiency fluid-structure interaction power take-off