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Study on Chaotic Characteristics of the Friction Process between High Hardness Alloy Steel and Cemented Carbide under C60 Nanoparticle Fluid Lubrication

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工程与科学中的计算机建模(英文) 2024年第1期138卷 525-550页

作者： Jingshan Huang Bin Yao Qixin Lan Zhirong Pan School of Aerospace Engineering Xiamen UniversityXiamen361005China

Friction and wear phenomenon is a complex nonlinear system,and it is also a significant problem in the process of metal *** order to systematically analyze the friction and wear process of tool material-workpiece material friction pair in the cutting process of high hardness alloy steel under different lubrication conditions,the chaotic characteristics of friction process between high hardness alloy steel and cemented carbide under the lubrication C60 nano-particles fluid are studied based on the chaos ***,the friction and wear experiments of the friction pair between high hardness alloy steel and cemented carbide tool are carried out based on the ring-block friction and wear tester,and the results of friction force signal in time domain and wear width are ***,the friction signals in time domain are processed and transformed based on phase space reconstruction and recurrence plot theory,and the recurrence plots of different experimental groups under different lubrication conditions are *** evolution law of recurrence plot is further observed and studied,and the recursive quantitative index is ***,the cutting experiments of tool wear are carried *** results show that the proposed method can intuitively and accurately reveal the wear evolution process and the wear feature identification law of the tool material-high hardness alloy steel pair under different lubrication ***,it is found that when the concentration of C60 nanoparticles is 200∼300 ppm,the stability of the friction pair system is *** proposed method can provide a strategy for wear prediction in cutting process,and provide a theoretical basis and technical support for antifriction lubrication methods in practical cutting applications.

关键词： C60 nanoparticles recurrence plot friction stability

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Fast and high-fidelity generation of photonic Greenberger-Horne-Zeilinger states in circuit QED

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Communications in Theoretical Physics 2020年第1期72卷 52-59页

作者： Jingwei Chen Guan-Hao Feng Hong-Hao Zhang L F Wei School of Physics Sun Yat-sen UniversityGuangzhou 510275China Photonics Laboratory and Institute of Functional Materials College of ScienceDonghua UniversityShanghai 201620China Information Quantum Technology Laboratory School of Information Science and TechnologySouthwest Jiaotong UniversityChengdu 610031China

A fast scheme to generate Greenberger-Horne-Zeilinger states between different cavities in circuit QED systems is *** implement this scheme,we design a feasible experimental device with three qubits and three *** this device,all the couplings between qubit and qubit,cavity and qubit are tunable and are independent with frequencies,and thus the shortcut to adiabaticity technique can be directly applied in our *** is demonstrated that the GHZ state can be generated rapidly with high fidelity in our scheme.

关键词： GHZ states shortcut to adiabaticity quantum state engineering circuit QED

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A Global-Optimal Portfolio Theory beyond the R-σModel

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Frontiers of Economics in China-Selected Publications from Chinese Universities 2020年第1期15卷 124-139页

作者： Yifan Liu Shi-Dong Liang School of Physics and State Key Laboratory of Optoelectronic Material and TechnologySun Yat-sen UniversityGuangzhou 510275China School of Economics Fudan UniversityShanghai 200433China

Deviations from the efficient market hypothesis allow us to benefit from risk premium in financial *** propose a three-pronged(R,σ,H)theory to generalize the(R,σ)model and present the formulation of a three-pronged(R,σ,H)model and its Pareto-optimal *** define the local-optimal weights(wR,wσ,WH)that construct the triangle of the quasi-optimal investing subspace and further define the centroid or incenter of the triangle as the optimal investing weights that optimize the mean return,risk premium,and volatility *** numerically investigating the Chinese stock market,we demonstrate the validity of this formulation *** proposed theory provides investors of different styles(conservative or aggressive)an efficient way to design portfolios in financial markets to maximize the mean return while minimizing the volatility risk.

关键词： portfolio R-σmodel Hurst exponent risk premium volatility Chinese stock market

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An easy way to controllably synthesize one-dimensional Sm B_6 topological insulator nanostructures and exploration of their field emission applications

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Chinese Physics B 2017年第11期26卷 503-509页

作者：杨汛甘海波田颜许宁生邓少芝陈军陈焕君梁世东刘飞 State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information Technology Sun Yat-sen University

A convenient fabrication technique for samarium hexaboride（SmB6） nanostructures（nanowires and nanopencils） is developed, combining magnetron-sputtering and chemical vapor deposition. Both nanostructures are proven to be single crystals with cubic structure, and they both grow along the [001] direction. Formation of both nanostructures is attributed to the vapor-liquid-solid（VLS） mechanism, and the content of boron vapor is proposed to be the reason for their different morphologies at various evaporation distances. Field emission（FE） measurements show that the maximum current density of both the as-grown nanowires and nanopencils can be several hundred μA/cm^2, and their FN plots deviate only slightly from a straight line. Moreover, we prefer the generalized Schottky-Nordheim（SN） model to comprehend the difference in FE properties between the nanowires and nanopencils. The results reveal that the nonlinearity of FN plots is attributable to the effect of image potential on the FE process, which is almost independent of the morphology of the *** the research results suggest that the SmB6 nanostructures would have a more promising future in the FE area if their surface oxide layer was eliminated in advance.

关键词： one-dimensional SmB6 nanostructures chemical vapor deposition(CVD) field emission(FE) image potential

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Closed-Loop Iterative Learning Control for Discrete Singular Systems with Fixed Initial Shift

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Journal of Systems science & Complexity 2019年第2期32卷 577-587页

作者： GU Panpan TIAN Senping LIU Qian School of Automation science and Engineering South China University of Technology

This paper deals with the problem of iterative learning control for a class of discrete singular systems with fixed initial shift. According to the characteristics of the discrete singular systems, a closed-loop learning algorithm is proposed and the corresponding state limiting trajectory is *** is shown that the algorithm can guarantee that the system state converges uniformly to the state limiting trajectory on the whole time interval. Then the initial rectifying strategy is introduced to the discrete singular systems for eliminating the effect of the fixed initial shift. under the action of the initial rectifying strategy, the system state can converge to the desired state trajectory within the pre-specified finite time interval no matter what value the fixed initial shift takes. Finally, a numerical example is given to illustrate the effectiveness of the proposed approach.

关键词： Closed-loop learning algorithm discrete singular systems, fixed initial shift iterative learning control

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Generalized Multivariate Gumbel Distributions——Dependence,Aging Properties and Applications

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Journal of Systems science & Complexity 2016年第6期29卷 1752-1772页

作者： FANG Rui LI Xiaohu LI Linxiong Department of Mathematics Shantou University Department of Mathematical sciences Stevens Institute of Technology Department of Mathematics University of New Orleans

This paper introduces a generalized multivariate Gumbel(GMG) distribution using a survival *** dependence properties of the GMG distribution and some analytical properties of the generators of the GMG distribution are ***,the authors also investigate the dependence behavior of the residual lifetime vector of the GMG *** an illustration,the GMG distribution is applied to fit a real data set.

关键词： Coefficient of orthant dependence residual lifetime vector survival copula upper orthantorder.

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Current Reversals of an underdamped Brownian Particle in an Asymmetric Deformable Potential

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Communications in Theoretical Physics 2018年第3期69卷 266-270页

作者： Chun-Chun Cai Jian-Li Liu Hao Chen Feng-Guo Li guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecom- munication Engineering South China Normal University Guangzhou 510006 China

Transport of an underdamped Brownian particle in a one-dimensional asymmetric deformable potential is investigated in the presence of both an ac force and a static force,*** numerical simulations,we obtain the current average *** current reversals and the absolute negative mobility are *** increasing of the deformation of the potential can cause the absolute negative mobility to be suppressed and even *** the static force is small,the increase of the potential deformation suppresses the absolute negative *** the force is large,the absolute negative mobility *** particular,when the potential deformation is equal to0.015,the two current reversals present with the increasing of the ***,when the potential deformation is small,there are three current reversals with the increasing of the friction coefficient and the average velocity presents a oscillation behavior.

关键词： particle transport asymmetric deformable potential absolute negative mobility current reversals

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Performance Analysis of NOMA-Based Cooperative Networks with Relay Selection

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China Communications 2020年第11期17卷 111-119页

作者： Ronglan Huang Dehuan Wan Fei Ji Hua Qing Jie Li Hua Yu Fangjiong Chen Guangxi Colleges and Universities Key Laboratory of Image Processing and Intelligent Information System Wuzhou UniversityWuzhou 543002China guangdong University of Finance Guangzhou 510521China School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510641China Key Laboratory of Marine Environmental Survey Technology and Application Ministry of Natural ResourcesGuangzhou510300China

Non-orthogonal multiple access(NOMA)technique is an expert on channel differences *** this paper,a dual-hop NOMA-based cooperative relaying network where a best relay is selected as an active node to accomplish the communication between a source and a destination is *** assume that both decode-and-forward(DF)and amplify-and-forward(AF)protocols are applied to the selected *** metrics that ergodic sum-rate and outage probability are investigated,and the closed-form expressions of the latter for DF and AF protocols are *** and simulation results are conducted to verify the validity of the theoretical analysis,in which we can see that the NOMA based DF relaying is better than the NOMA based AF relaying and other existing NOMA-based cooperative communication schemes.

关键词： non-orthogonal multiple access(NOMA) decode-and-forward(DF) amplify-and-forward(AF) relay selection ergodic sum-rate outage probability

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Lithium/Silver-Doped Cu_2ZnSnS_4 with Tunable Band Gaps and Phase Structures: a First-Principles Study

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Chinese Physics Letters 2018年第8期35卷 19-23页

作者： Jun Zhang Jun Liao Le-Xi Shao Shu-Wen Xue Zhi-Cuo Wang School of Physical science and Technology Lingnan Normal UniversityZhanjiang 524048 School of Electronics science and Engineering Center for Public Security TechnologyUniversity of Electronic Science and Technology of ChinaChengdu 610054

Doping is an effective approach for improving the photovoltaic performance of Cu2 ZnSnS4（CZTS）. The doping by substitution of Cu atoms in CZTS with Li and Ag atoms is investigated using density functional theory. The results show that the band gaps of Li（2 x）Cu2（1-x）ZnSnS4 and Ag（2 x）Cu2（1-x）ZnSnS4 can be tuned in the ranges of 1.30-3.43 and 1.30-1.63 eV, respectively. The calculation also reveals a phase transition from kesterite to wurtzite-kesterite for Li（2 x）Cu2（1-x）ZnSnS4 as x is larger than 0.9. The tunable band gaps of Li（2 x）Cu2（1-x）ZnSnS4 and Ag（2 x）Cu2（1-x） ZnSnS4 make them beneficial for achieving band-gap-graded solar cells.

关键词： Cu a First-Principles Study Ag Zn Sn

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Bioinformatics Analysis on lncRNA and mRNA Expression Profiles for Novel Biological Features of Valvular Heart Disease with Atrial Fibrillation

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Journal of Electronic science and Technology 2021年第1期19卷 53-69页

作者： Wei Zeng Ni-Ni Rao Ke Liu the School of Life science and Technology University of Electronic Science and Technology of ChinaChengdu 610054 the guangdong Institute of Electronic Information Engineering University of Electronic Science and Technology of ChinaDongguan 523107 the Department of Sichuan Academy of Medical science Sichuan Provincial People’s HospitalChengdu 610072

The biological features of the valvular heart disease with atrial fibrillation(AF-VHD)remain unknown when involving long non-coding RNAs(lncRNAs).This study performed system analysis on lncRNA and messenger RNA(mRNA)expression profiles constructed by using bioinformatics methods and tools for biological features of *** change and t-test were used to identify differentially expressed(DE)lncRNAs and *** enrichment analysis of DE mRNAs was *** subgroups formed by lncRNAs and nearby mRNAs were screened,and a transcriptional regulation network among lncRNAs,mRNAs,and transcription factors(TFs)was *** interactions between mRNAs related to lncRNAs and drugs were *** 620 AF-VHDrelated DE lncRNAs and 452 DE mRNAs were *** 3 lncRNA subgroups were *** 665 regulations mediated by lncRNAs and TFs were *** 9 mRNAs related to lncRNAs had 1 or more potential drug interactions,totaling 37 *** these,9 drugs targeting 3 genes are already known to be able to control or trigger atrial fibrillation(AF)or other cardiac *** found biological features of AF-VHD provide foundations for further biological experiments to better understand the roles of lncRNAs in development from the valvular heart disease(VHD)to AF-VHD.

关键词： Expression profiles long non-coding RNA(lncRNA) messenger RNA(mRNA) valvular heart disease(VHD) valvular heart disease with atrial fibrillation(AF-VHD).

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