检索结果-南通市图书馆

Effects of Time Delay on Multistability of Genetic Toggle Switch

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2015年第6期28卷 -页

作者： De-qing Zhu Hui-jun Jiang zhong-huai hou Department of Chemical Physics & Hefei National Laboratory for Physical Sciences at the Microscales iChEM University of Science and Technology of China Hefei 230026 China

The effect of time delay on a genetic toggle switch, whose undelayed dynamics shows low protein expression states (L-states), high expression states (H-states) and coexistence of them different transcription-factor binding rates α, is investigated by using the delayed stochastic simulation method. Interestingly, we find that the delay induces a transition from the coexistence state to L-state or H-state by suppressing the other state. Moreover, the phase diagram on the α-τ plane is obtained by extensive simulations. It is observed that, the coexistence state is remarkably narrowed by increasing delay time, and completely disappears above a triple-point-like point where direct transitions between H-state and L-state are possible.

关键词： Genetic toggle switch Delay Multistability

Coherent Resonance for Rate Oscillations During CO Oxidation on Pt（110） Surfaces： Interplay Between Internal and External Noise

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第4期21卷 339-345页

作者： Juan Ma zhong-huai hou hou-wen Xin Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Hefei National Lab of Physical Science at Microscale University of Science and Technology of China Hefei 230026 China

Effects of noise on rate oscillations during CO oxidation on Pt（110） surface were investigated, both theoretically and numerically, by focusing on the interplay of internal noise （IN） due to stochasticity in reaction events, and external noise （EN） resulting from parameter perturbation. The surface is divided into cells of variable size which are assumed to be well mixed, and we consider the behavior inside a single cell. Attention is paid to parameter regions subthreshold of the deterministic Hopf bifurcation, where noise can induce stochastic oscillations, the signal-to-noise ratio （SNR） of which shows a maximum with the variation of noise intensity, known as coherent resonance （CR）. By stochastic normal theory, we show that IN and EN contribute in a weighted additive way to an effective noise that lead to CR, such that SNR shows a ridge shape in the D-1/√N plane, where D and 1/√N measures the strength of EN and IN, respectively. It is shown that for too large IN （EN）, CR behavior with EN （IN） no longer exists. Numerical simulations show good agreements with the theoretical results.

关键词： Fluctuation Oscillation Coherent resonance Surface catalysis

Mode-Coupling Theory for Glass Transition of Active-Passive Binary Mixture

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2018年第4期31卷 584-594,616页

作者： Meng-kai Feng zhong-huai hou Department of Chemical Physics ＆ Hefei National Laboratory for Physical Sciences at the Microscales iChEMUniversity of Science and Technology of ChinaHefei 230025China

Collective behaviours of active particle systems have gained great research attentions in re- cent years. Here we present a mode-coupling theory （MCT） framework to study the glass transition of a mixture system of active and passive Brownian particles. The starting point is an eff）ctive Smoluchowski equation, which governs the dynamics of the probability dis- tribution function in the position phase space. With the assumption of the existence of a nonequilibrium steady state, we are able to obtain dynamic equations for the intermediate scattering functions （ISFs）, wherein an irreducible memory function is introduced which in turn can be written as functions of the ISFs based on standard mode-coupling approximations. The effect of particle activity is included through an effective difIusion coefficient which can be obtained via short time simulations. By calculating the long-time limit of the ISF, the Debye-Waller （DW） factor, one can determine the critical packing fraction ηc of glass transition. We find that for active-passive （AP） mixtures with the same particle sizes, ηc increases as the partial fraction of active particle xA increases, which is in agreement with previous simulation works. For system with different active/passive particle sizes, we find an interesting reentrance behaviour of glass transition, i.e., ηc shows a non-monotonic dependence on xa. In addition, such a reentrance behaviour would disappear if the particle activity is large enough. Our results thus provide a useful theoretical scheme to study glass transition behaviour of active-passive mixture systems in a promising way.

关键词： Glass transition Mode-coupling theory Active particles Active-passive par ticle mixture

Simulation Study of Passive Rod Diffusion in Active Bath:Nonmonotonic Length Dependence and Abnormal Translation-Rotation Coupling

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2021年第2期34卷 157-164,I0001页

作者： Rui-kai Xu Hui-jun Jiang zhong-huai hou Department of Chemical Physics&Hefei National Laboratory for Physical Sciences at the Microscale iChEMUniversity of Science and Technology of ChinaHefei 230026China

Diffusion of tracer particles in active bath has attracted extensive attention in recent *** far,most studies have considered isotropic spherical tracer particles,while the diffusion of anisotropic particles has rarely been *** we investigate the diffusion dynamics of a rigid rod tracer in a bath of active particles by using Langevin dynamics simulations in a two-dimensional *** attention is paid to how the translation(rotation)diffusion coefficient D_(T)(D_(R))change with the length of rod L and active strength *** all cases,we find that rod exhibits superdiffusion behavior in a short time scale and returns to normal diffusion in the long time *** D_(T) and D_(R) increase with Fa,but interestingly,a nonmonotonic dependence of D_(T)(D_(R))on the rod length has been *** have also studied the translation-rotation coupling of rod,and interestingly,a negative translation-rotation coupling is observed,indicating that rod diffuses more slowly in the parallel direction compared to that in the perpendicular direction,a counterintuitive phenomenon that would not exist in an equilibrium counterpart ***,this anomalous(diffusion)behavior is reentrant with the increase of Fa,suggesting two competitive roles played by the active feature of bath particles.

关键词： Active particle Translation-rotation coupling Anomalous diffusion

Emergent Swarming States in Active Particles System with Opposite Anisotropic Interactions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2020年第6期33卷 717-726,I0002页

作者： Yong-liang Gou Hui-jun Jiang zhong-huai hou Department of Chemical Physics&Hefei National Laboratory for Physical Sciences at the Microscale iChEMUniversity of Science and Technology of ChinaHefei 230026China

From the organization of animal flocks to the emergence of swarming behaviors in bacterial suspension,populations of motile organisms at all scales display coherent collective *** studies showed that the anisotropic interaction between active particles plays a key role in the phase *** we investigate the collective behaviors of based-active Janus particles that experience an anisotropic interaction of which the orientation is opposite to the direction of active force by using Langevin dynamics simulations in two dimensional ***,the system shows emergence of collective swarming states upon increasing the total area fraction of particles,which is not observed in systems without anisotropic interaction or *** threshold for emergence of swarming states decreases as particle activity or interaction strength *** have also performed basic kinetic analysis to reproduce the essential features of the simulation *** results demonstrate that anisotropic interactions at the individual level are sufficient to set homogeneous active particles into stable directed motion.

关键词： Active particle Anisotropic interaction Swarming

High‑Entropy Electrode Materials:Synthesis,Properties and Outlook

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第1期17卷 472-506页

作者： Dongxiao Li Chang Liu Shusheng Tao Jieming Cai Biao zhong Jie Li Wentao Deng Hongshuai hou Guoqiang Zou Xiaobo Ji College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083People’s Republic of China School of Chemistry and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104People’s Republic of China

High-entropy materials represent a new category of high-performance materials,first proposed in 2004 and extensively investigated by researchers over the past two *** definition of high-entropy materials has continuously *** the last ten years,the discovery of an increasing number of high-entropy materials has led to significant advancements in their utilization in energy storage,electrocatalysis,and related domains,accompanied by a rise in techniques for fabricating high-entropy electrode ***,the research emphasis has shifted from solely improving the performance of high-entropy materials toward exploring their reaction mechanisms and adopting cleaner preparation ***,the current definition of high-entropy materials remains relatively vague,and the preparation method of high-entropy materials is based on the preparation method of single metal/low-or medium-entropy *** should be noted that not all methods applicable to single metal/low-or medium-entropy materials can be directly applied to high-entropy *** this review,the definition and development of high-entropy materials are briefly ***,the classification of high-entropy electrode materials is presented,followed by a discussion of their applications in energy storage and catalysis from the perspective of synthesis ***,an evaluation of the advantages and disadvantages of various synthesis methods in the production process of different high-entropy materials is provided,along with a proposal for potential future development directions for high-entropy materials.

关键词： High-entropy Energy storage Electrode materials

Catalytic Oscillatory Oxidation of CO on Pt(110): on-off Control to Chaos

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第9期15卷 695-696页

作者： YANG Ling-fa hou zhong-huai XIN hou-wen Department of Chemical Physics University of Science and Technology of ChinaHefei 230026

An improved mean-field model,which specially takes into account pair correlation,was proposed to describe catalytic oscillatory oxidation of CO on Pt(110).By applying on-off control strategies under different frequency,the chemical oscillator shows an abundance of periodic doubling processes,even chaos response,and the route to the chaos and out of the chaos were both identified as period-doubling through analysis of its Lyapunov exponent *** response results reveal that structure delay effect plays an important role to the complexity of this system.

关键词： spectrum. chaos doubling

Explosive Synchronization and Emergence of Assortativity on Adaptive Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第5期28卷 198-201页

作者： JIANG Hui-Jun WU Hao hou zhong-huai Department of Chemical Physics and Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026

We report an explosive transition from incoherence to synchronization of coupled phase oscillators on adaptive networks,following an Achlioptas process based on dynamic clustering *** each adaptive step of the network topology,a portion of the links is randomly removed and the same amount of new links is generated following the so-called product rules(PRs)applied to the dynamic ***,two types of PRs are considered,namely,the min-PR and *** demonstrate that the synchronization transition becomes explosive in both ***,we find that the min-PR rule can lead to disassortativity of the network topology,while the max-PR rule leads to assortativity.

关键词： synchronization Synchronization network

Visualization of Film Wavelike Characteristics and Measurement of Film Thickness in Spray Cooling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2013年第2期22卷 186-195页

作者： Yan hou Yujia Tao Xiulan huai Institute of Engineering Thermophysics Chinese Academy of Sciences University of the Chinese Academy of Sciences

An experimental investigation was performed to study the heat transfer in an eight-nozzle spray cooling system with de-ionized water as the working fluid. Visualization of the liquid-solid contact area and the flow near the heated surface was made using a microscopic lens system in conjunction with an advanced high-speed camera. The film thickness and film wavelike characteristics under liquid volume flow rates ranged from 2.78×10 -6 m 3 /s to 1.39×10 -5 m 3 /s and surface temperatures between 22℃ and 78.2℃ were examined respectively. The development process of the liquid film on the heated surface was observed. The local mean film thickness, the film wavelike characteristics and the behavior of the bubbles appeared in the liquid film were captured using an image processing technique. It is discovered that there exists a climax of local mean film thickness during the starting process of spray cooling. When the liquid film reaches the dynamic stable state, the dimensionless mean film thickness decreases with the increase of the liquid volume flow rate, and increases with the increase of surface temperature generally. Besides, the volume flow rate has a more significant impact on the wavelength and amplitude of the liquid film compared to the surface temperature.

关键词： Spray cooling Visualization Film thickness measurement Film wavelike characteristics