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Tasting nuclear pasta made with classical molecuar dynamics simulations

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Frontiers of physics 2021年第2期16卷 115-117页

作者： bao-An Li Department of Physics and Astronomy Texas A&M University-CommerceTX 75429-3011USA

Nuclear clusters or voids in the inner crust of neutron stars were predicted to have various shapes collectively nicknamed nuclear *** recent review in Ref.[1]by Lopez,Dorso and Frank summarized their systematic investigations into properties especially the mor-phological and thermodynamical phase transitions of the nuclear pasta within a Classical Molecular Dynamics model,providing further stimuli to find more observational evidences of the predicted nuclear pasta in neutron stars.

关键词： collective summarized transitions

Variable Star Status of Two Stars:V204 and I-I-39 in M3

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Chinese Journal of Astronomy and Astrophysics 2007年第6期7卷 771-776页

作者： bao-An Yao Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030

The star 1-1-42 （=vZ1390）, a cluster member in M3, located near the red edge of the instability strip of the horizontal branch, was discovered by Roberts and Sandage as a low amplitude variable, it was designated as V204 in the ＂second catalogue of variable stars in globular clusters＂, but its coordinates given in all versions of this catalogue are wrong since 1955. We argue that V204 is indeed a low amplitude HB variable star, located near to the red edge of the instability strip, with a period of 0.74785d and an amplitude of about 0.04 mag in V. We also find that the red cluster member star 1-1-39 is a low amplitude variable with a period of 1.16^d and amplitude of about 0.03 mag in V which might be pulsating at the second overtone.

关键词： globular cluster -- stars variables -- stars individual (V204 and I-I-39)

A note on the entropy of mean curvature flow

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Science China Mathematics 2015年第12期58卷 2611-2620页

作者： bao Chao Key Laboratory of Pure and Applied Mathematics School of Mathematical SciencesPeking University

The entropy of a hypersurface is given by the supremum over all F-functionals with varying centers and scales, and is invariant under rigid motions and dilations. As a consequence of Huisken's monotonicity formula, entropy is non-increasing under mean curvature flow. We show here that a compact mean convex hypersurface with some low entropy is diffeomorphic to a round sphere. We also prove that a smooth selfshrinker with low entropy is a hyperplane.

关键词： entropy self-shrinker mean curvature flow sphere

Development and prospects of molten steel deoxidation in steelmaking process

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 18-32页

作者： Zhongliang Wang Yanping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In the long traditional process of steelmaking,excess oxygen is blown into the converter,and alloying elements are used for *** inevitably results in excessive deoxidation of products remaining within the steel liquid,affecting the cleanliness of the *** the increasing requirements for steel performance,reducing the oxygen content in the steel liquid and ensuring its high cleanliness is *** more than a hundred years of development,the total oxygen content in steel has been reduced from approximately 100×10^(-6)to approximately 10×10^(-6),and it can be controlled below 5×10^(-6)in some steel grades.A relatively stable and mature deoxidation technology has been formed,but further reducing the oxygen content in steel is no longer significant for improving steel *** research team developed a deoxidation technology for bearing steel by optimizing the entire conventional *** technology combines silicon–manganese predeoxidation,ladle furnace diffusion deoxidation,and vacuum final *** successfully conducted industrial experiments and produced interstitial-free steel with natural decarbonization ***-aluminum deoxidation was found to control the oxygen content in bearing steel to between 4×10^(-6) and 8×10^(-6),altering the type of inclusions,eliminating large particle Ds-type inclusions,improving the flowability of the steel liquid,and deriving a higher fatigue *** natural decarbonization predeoxidation of interstitial-free steel reduced aluminum consumption and production costs and significantly improved the quality of cast billets.

关键词： steel deoxidation deoxidizer metallurgical equipment bearing steel IF steel

基于“时间-空间-关系”三个维度的美丽城市建设研究

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生态经济 2025年第1期41卷 19-27页

作者：包存宽申沐曦李红丽复旦大学环境科学与工程系上海200438 复旦大学大气与海洋科学系上海200438

论文探讨了人与自然和谐共生美丽城市的时代内涵,即美丽城市是坚持以人民为中心的发展思想,兼具客观性与主观性,呈现绿色低碳、环境优美、生态宜居、安全健康、智慧高效等时代特征的,并从景观生态学及“存在的三元辩证”,构建了“时间... 详细信息

论文探讨了人与自然和谐共生美丽城市的时代内涵,即美丽城市是坚持以人民为中心的发展思想,兼具客观性与主观性,呈现绿色低碳、环境优美、生态宜居、安全健康、智慧高效等时代特征的,并从景观生态学及“存在的三元辩证”,构建了“时间—空间—关系”的三维分析框架,阐述了美丽城市建设的“全领域转型”“全方位提升”“全地域建设”以及“全社会行动”四大关键任务,最后提出了美丽城市建设的政策建议。

关键词：美丽中国美丽城市城市治理城市更新

Existence and Instability of Some Nontrivial Positive Steady States for the SKT Model with Double Cross Diffusion

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Acta Mathematicae Applicatae Sinica 2023年第3期39卷 623-637页

作者： Zhi-bao TANG School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

This paper is concerned with the nonconstant positive steady states of the Shigesada-Kawasaki-Teramoto model for two competing species with double cross-diffusion *** applying the Lyapunov-Schmidt decomposition method,the higher order expansion and some detailed spectral analysis,we prove the existence,asymptotic behavior and spectral instability of non-trivial steady states in high-dimensional case when one of the two cross-diffusion coefficients is large enough.

关键词： double cross-diffusion existence asymptotic behavior spectral instability

Unimodality of Independence Polynomials of the Cycle Cover Product of Graphs

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Acta Mathematica Sinica,English Series 2022年第5期38卷 858-868页

作者： bao Xuan ZHU School of Mathematics and Statistics Jiangsu Normal UniversityXuzhou 221116P.R.China

An independent set in a graph G is a set of pairwise non-adjacent *** ik(G)denote the number of independent sets of cardinality k in *** its generating function I(G;x)=∑^(α(G))^(k=0)ik(G)x^(k),is called the independence polynomial of G(Gutman and Harary,1983).In this paper,we introduce a new graph operation called the cycle cover product and formulate its independence *** also give a criterion for formulating the independence polynomial of a *** on the exact formulas,we prove some results on symmetry,unimodality,reality of zeros of independence polynomials of some *** applications,we give some new constructions for graphs having symmetric and unimodal independence polynomials.

关键词： Independence polynomials unimodality log-concavity real zeros symmetry cycle cover product of graphs

Global Regularity of Solutions for a One-dimensional Nuclear Fluid with Non-monotone Pressure

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Acta Mathematicae Applicatae Sinica 2019年第4期35卷 798-811页

作者： bao-wei FENG Department of Economic Mathematics Southwestern University of Finance and Economics

We consider a one-dimensional continuous thermal model of nuclear matter, which is described by a compressible Navier-Stokes-Poission system with a non-monotone equation of state owing to the effective Skyrme nuclear interaction between particles. We prove the global existence of solutions in H^4 space for a free boundary value problem with a possible destabilizing influence of the pressure which is not always positive,provided a sufficient thermal dissipation is present and first obtain the existence of classical solutions.

关键词： global existence compressible fluid non-monotone fluid

Memristive cyclic three-neuron-based neural network with chaos and global coexisting attractors

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Science China(Technological Sciences) 2022年第11期65卷 2582-2592页

作者： bao Han CHEN ZhuGuan CAI JianMing XU Quan bao BoCheng School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China

It has been documented that a cyclic three-neuron-based neural network with resistive synaptic weights cannot exhibit *** this end,a memristive cyclic three-neuron-based neural network is presented using a memristive weight to substitute a resistive *** memristive cyclic neural network always has five equilibrium points within the parameters of interest,and their stability analysis shows that they are one index-2 saddle-focus,two index-1 saddle-foci,and two stable node-foci,*** analyses are performed for the memristive cyclic neural network by several numerical simulation *** results demonstrate that the memristor synapse-based neural network with the simplest cyclic connection can not only exhibit chaos,but also present global coexisting attractors composed of stable points and unstable periodic or chaotic orbits under different initial ***,with the designed implementation circuit,Multisim circuit simulations and hardware experiments are executed to validate the numerical simulations.

关键词： memristive weight cyclic neural network chaos coexisting attractors hardware experiment