Chinese Journal of Physics最新文献_第10页

Global stability analysis on the onset of convection in an inclined porous layer with Casson fluid under the effect of viscous dissipation and along-slope buoyancy induced throughflow 粘性耗散和顺坡浮力诱导的通流作用下卡森流体倾斜多孔层对流开始的全局稳定性分析

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-03 DOI: 10.1016/j.cjph.2025.12.001

Jacqueline Do Rosario e Souza , Bhagya Mathapati , Ravi Ragoju , Dhananjay Yadav

This study investigates the onset of thermal convection within a Casson fluid-saturated, inclined porous layer and accounting for the effect of viscous dissipation and along-slope buoyancy induced throughflow. The system consists of two parallel plates with an angle of inclination, ϕ from the horizontal and is analyzed using linear and nonlinear stability characteristics. Darcy law is used to describe the flow. The governing equations, including continuity, momentum, and energy balances, are first non-dimensionalized to introduce key parameters such as the Darcy–Rayleigh number, the Gebhart number, inclination angle, and the Casson fluid index. Linear stability analysis of disturbances is conducted by applying a normal mode technique. To complement the linear analysis, nonlinear stability is examined using the energy method, where an energy functional is constructed to determine thresholds for global nonlinear stability. The boundary eigenvalue problem in the two analyses are solved using the boundary value problem solver bvp4c routine in MATLAB. Comparisons between linear and nonlinear analyses are presented, supported by graphical representations of stability boundaries. The results reveal that longitudinal rolls are the most unstable modes and that inclination has a stabilizing effect, while the non-Newtonian nature of the Casson fluid tends to reduce the stability threshold. Increasing Gebhart number (stronger viscous dissipation) promotes instability, and along-slope buoyancy induced throughflow directionally shifts neutral curves-either amplifying or offsetting dissipation-induced destabilization depending on its direction. These findings provide insights into the complex interplay between fluid rheology, thermal dissipation, and system geometry, contributing to the understanding of thermal convection in porous media filled with non-Newtonian fluids.

本文研究了卡森流体饱和的倾斜多孔层内热对流的开始，并考虑了粘性耗散和沿坡浮力诱导的通流的影响。该系统由两个具有倾角的平行板组成，其中φ来自水平，并使用线性和非线性稳定性特性进行分析。达西定律用于描述流动。首先对控制方程（包括连续性、动量和能量平衡）进行无量纲化，以引入关键参数，如Darcy-Rayleigh数、Gebhart数、倾角和Casson流体指数。采用正态模态技术对扰动进行线性稳定性分析。为了补充线性分析，使用能量方法检查非线性稳定性，其中构造能量泛函以确定全局非线性稳定性的阈值。利用MATLAB中的边值问题求解器bvp4c例程对两种分析中的边值问题进行求解。给出了线性分析和非线性分析的比较，并用稳定性边界的图形表示加以支持。结果表明，纵向滚动是最不稳定的模式，而倾角具有稳定作用，而卡森流体的非牛顿性质倾向于降低稳定阈值。增加格哈特数（更强的粘性耗散）促进了不稳定性，沿坡浮力诱导的通流定向移动中性曲线——根据其方向放大或抵消耗散诱导的不稳定性。这些发现为流体流变学、热耗散和系统几何之间复杂的相互作用提供了见解，有助于理解充满非牛顿流体的多孔介质中的热对流。

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引用次数: 0

First-principles study of the electronic and gas adsorption properties of one dimensional single-chain GaXY (X = S, Se; Y = F, Cl, Br, I) 一维单链GaXY （X = S, Se; Y = F, Cl, Br， I）的电子和气体吸附性质第一性原理研究

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.11.015

Lanyin Liu , Xinghong Cai , Ziyi Ran , Qun Hui , Min Wang

The successful reported synthesis of one-dimensional (1D) helical single-chain Gallium Sulfur Iodine (GaSI) has sparked our interest in this novel material. Using first-principles calculations, we theoretically investigated the structural and electronic properties of GaSI and explored the adsorption of various gases on its surface. 1D GaSI is predicted to be stable at temperatures up to 500 K. The material, GaSI, is characterized by a wide bandgap of 2.05 eV, making it of interest for optoelectronic devices. Computational analysis of the adsorption energies and electronic changes upon gas adsorption on GaSI indicates that GaSI is a promising sensor for detection of Nitrogen Monoxide (NO). After elemental substitution, we also studied other gallium sulfur halides. A related compound Gallium Sulfur Fluoride (GaSF), which is formed after elemental substitution (replacing Iodide with Fluorine) demonstrates enhanced detection properties for NO, highlighting the tunability of this material class. The research concludes that these 1D Gallium Sulfur Halides (like GaSI and GaSF) are viable low-dimensional materials for next-generation technology in several fields like nanoelectronics, optoelectronics, photovoltaics, and sensing applications.

一维（1D）螺旋单链镓硫碘（GaSI）的成功合成引起了我们对这种新材料的兴趣。利用第一性原理计算，从理论上研究了GaSI的结构和电子性质，并探索了各种气体在其表面的吸附。预计1D GaSI在高达500k的温度下是稳定的。该材料，GaSI，具有2.05 eV的宽带隙，使其成为光电器件的兴趣。气体在GaSI上的吸附能和电子变化的计算分析表明，GaSI是一种很有前途的检测一氧化氮（NO）的传感器。元素置换后，我们还研究了其他的硫卤化镓。元素取代（用氟取代碘化物）后形成的相关化合物氟化镓硫（GaSF）对NO的检测性能增强，突出了这类材料的可调性。该研究得出结论，这些一维镓硫卤化物（如GaSI和GaSF）在纳米电子学、光电子学、光伏和传感应用等多个领域是下一代技术的可行低维材料。

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引用次数: 0

Structural, electronic, magnetic, half-metallic, and thermoelectric properties of a novel rare rarth-based quaternary Heusler compounds 一种新型稀有稀土基季系Heusler化合物的结构、电子、磁性、半金属和热电性质

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.11.008

Saadi Berri , Ayache Mebarek Azzem , Djamel Maouche , Çağatay Yamçıçıer

First-principles calculations were performed to investigate the structural, electronic, half-metallic and thermoelectric properties of 27 specific rare-earth-based quaternary Heusler compounds, selected from a palette of R (Pr, Nd, Gd, Tb, La), X (Co, Fe, Ru), Y (Mn, V, Cr), and Z (Al, Ga, In) elements. We have opted for a Full-Potential Linearized Augmented Plane Wave (FP-LAPW) method based on the Density Functional Theory (DFT) as implemented in Wien2k for our calculations. For the comprehensive analysis, PBE-GGA, and TB-mBJ functionals were used. The ground state parameters of RE-EQHs were determined, including the lattice parameter, total energy bulk modulus, and its derivative. The electronic structure of the RE-EQHs under consideration indicates that they are half-metallic ferromagnetic alloys. The total spin magnetic moments for all the half-metals satisfy the Slater-Pauling 18 electron-rule, confirming the existence of the half-metallic gap. The Seebeck coefficient, power factor, and semiclassical Boltzmann theory figure of merit are calculated using Boltztrap code to study these materials' thermoelectric properties. The compounds exhibit exceptionally high Seebeck coefficients (with values up to ≈ 1000 μV/K) and promising thermoelectric figures of merit that approach the ideal benchmark of 1.0 at 900K, positioning them as strong candidates for high-temperature thermoelectric applications.

从R (Pr, Nd, Gd, Tb, La), X (Co, Fe, Ru), Y （Mn， V, Cr）和Z （Al, Ga, In）元素中选择27种特定的稀土基季系Heusler化合物进行第一性原理计算，研究其结构、电子、半金属和热电性质。我们选择了基于密度泛函理论（DFT）的全势线性化增广平面波（FP-LAPW）方法进行计算，该方法在Wien2k中实现。综合分析采用PBE-GGA和TB-mBJ函数。确定了RE-EQHs的基态参数，包括晶格参数、总能量体积模量及其导数。所研究的RE-EQHs的电子结构表明它们是半金属铁磁合金。所有半金属的总自旋磁矩满足Slater-Pauling 18电子规则，证实了半金属间隙的存在。利用玻尔兹阱程序计算了塞贝克系数、功率因数和半经典玻尔兹曼理论优值，研究了这些材料的热电性能。这些化合物具有非常高的塞贝克系数（高达≈1000 μV/K）和有希望的热电值，在900K时接近1.0的理想基准，使它们成为高温热电应用的有力候选者。

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引用次数: 0

Activation cross sections of alpha-particle-induced reactions on niobium-93 up to 50 MeV 在50 MeV以下的铌-93上α粒子诱导反应的激活截面

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.11.038

He Huang , Masayuki Aikawa , Shuichiro Ebata , Kenta Sugihara , Zolbadral Tsoodol , Naoyuki Ukon , Hiromitsu Haba , Sándor Takács , Ferenc Ditrói , Zoltán Szűcs , Tamás Tornyi

Technetium radioisotopes have garnered interest in medical applications. In this study, niobium-93 foils were irradiated with a 50-MeV alpha-particle beam to determine the production cross sections of technetium radioisotopes including ^{96g,95m,95g,94g,93m,93g}Tc, along with ^93mMo, ^{95m,95g,92m,91m,90}Nb, ^89gZr and ^88,87gY. The stacked-foil activation technique and gamma-ray spectrometry were adopted for this experiment. The results were compared with the theoretical values of TALYS based TENDL-2023 library, and the previously published experimental data. Physical thick target yields (TTY) were deduced based on the measured cross sections.

锝放射性同位素在医学上的应用引起了人们的兴趣。本研究采用50 mev α粒子束辐照铌-93箔，测定了96g、95m、95g、94g、93m、93gTc以及93mMo、95m、95g、92m、91m、90Nb、89gZr和88、87gY等锝放射性同位素的生成截面。本实验采用叠箔活化技术和伽马射线能谱法。结果与基于TALYS的TENDL-2023文库的理论值和先前发表的实验数据进行了比较。根据实测截面推导了物理厚靶产率（TTY）。

引用次数: 0

Electrothermal flow of CNT-blood on a sensor plate with ramping shear and thermal flux: Electromagnetic biosensor applications 碳纳米管血液在传感器板上的电热流动，具有斜坡剪切和热通量：电磁生物传感器的应用

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.10.029

Sanatan Das , Poly Karmakar , Biswajit Mandal , Chanchal Mandal , Rabindra Nath Jana

This study investigates the electrothermal hemodynamics of carbon nanotube-blended blood (CNT-blood) flow over an electromagnetic (EM) sensor plate under time-ramping shear stress and thermal flux conditions. Our computational model enables analysis of transient flow patterns and thermal profiles of CNT-blood under applied magnetic and electric fields. The flow regulating equations, considering porous medium resistance and infrared radiation, are solved analytically to examine the flow, and thermal distributions over the EM sensor plate. The results reveal that time-dependent shear stress and thermal flux significantly influence the flow dynamics and thermal response, enhancing the sensitivity of the EM sensor. Electrode/magnet width variation enables precise regulation of blood flow dynamics Infrared radiation intensity serves as the control parameter for blood temperature regulation. The sensor plate temperature is 18-22 % higher under a constant heat flux than a ramped one, due to continuous energy input. CNT-blood also exhibits 12-15 % greater thermal performance than nano-blood, as the hybrid CNTs network enhances phonon transport by reducing interfacial resistance. This research establishes a theoretical foundation for advancing electromagnetic biosensor technology, specifically for the continuous monitoring of hemorheological and thermal irregularities. The model’s inherent flexibility in responding to temporal variations extends its potential applications to dynamic biomedical environments, encompassing next-generation wearable sensors and implantable devices for cardiovascular assessment.

本研究研究了碳纳米管混合血液（CNT-blood）在时间变剪切应力和热通量条件下通过电磁（EM）传感器板的电热血流动力学。我们的计算模型能够分析碳纳米管血液在外加磁场和电场下的瞬态流动模式和热剖面。在考虑多孔介质阻力和红外辐射的情况下，对流动调节方程进行了解析求解，考察了电磁传感器板上的流动和热分布。结果表明，随时间变化的剪切应力和热通量显著影响流体动力学和热响应，提高了电磁传感器的灵敏度。电极/磁体宽度变化可精确调节血流动力学。红外辐射强度可作为调节血液温度的控制参数。由于连续的能量输入，在恒定的热通量下，传感器板的温度比斜坡温度高18- 22%。碳纳米管血液的热性能也比纳米血液高12- 15%，因为混合碳纳米管网络通过减少界面阻力来增强声子传输。本研究为推进电磁生物传感器技术，特别是对血液流变学和热异常的连续监测奠定了理论基础。该模型在响应时间变化方面的固有灵活性将其潜在应用扩展到动态生物医学环境，包括用于心血管评估的下一代可穿戴传感器和植入式设备。

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引用次数: 0

Degenerate soliton solutions and their dynamics in a coupled generalized nonlinear Schrödinger equations with the four-wave mixing effect 具有四波混频效应的耦合广义非线性Schrödinger方程中的简并孤子解及其动力学

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.08.002

Dan-Yu Yang

Energy distribution of the degenerate solitons is more concentrated, they are more resistant to external disturbances (such as the noise and dispersion). This paper investigates the degenerate soliton solutions for coupled generalized nonlinear Schrödinger equations with the four-wave mixing effect in a birefringent fiber. Since the interactions of degenerate solitons in this equations are not studied, this paper investigate the properties and inelastic interactions of degenerate solitons. We construct the two-, three- and four-degenerate soliton solutions with one and two spectral parameters. According to the asymptotic analysis method, we find that the amplitudes of the interacting solitons retain unchanged upon the interactions, thus the elastic interactions between two degenerate solitons are depicted. Relative distance between two asymptotic solitons exhibits logarithmic growth with

| t |

, where

t

represents the retarded time. Soliton separation acceleration decays exponentially with relative distance, eventually tends to zero. Phase shifts vary slowly with

t

. Elastic and inelastic interactions of three and four degenerate solitons with multiple iterations of one and two spectral parameters are presented. Different from the previous literary works, this paper solves the degenerate soliton solutions of this equations using the multiple spectral parameters and obtains some inelastic interactions. Elastic interactions may provide a technical foundation for the high fidelity information transmission. Inelastic interactions may have wide applications in the energy conversion and signal processing. This paper may be helpful for understanding the soliton propagation characteristics in the nonlinear media.

简并孤子的能量分布更集中，对外界干扰（如噪声和色散）的抵抗能力更强。研究了双折射光纤中具有四波混频效应的耦合广义非线性Schrödinger方程的简并孤子解。由于没有研究该方程中简并孤子的相互作用，本文研究了简并孤子的性质和非弹性相互作用。构造了具有一个和两个谱参数的二简并孤子解、三简并孤子解和四简并孤子解。根据渐近分析方法，我们发现相互作用孤子的幅值在相互作用时保持不变，从而描述了两个简并孤子之间的弹性相互作用。两个渐近孤子之间的相对距离随着|到|呈对数增长，其中t表示延迟时间。孤子分离加速度随相对距离呈指数衰减，最终趋于零。相移随时间缓慢变化。给出了具有一个和两个谱参数多次迭代的三个和四个简并孤子的弹性和非弹性相互作用。与以往文献不同的是，本文利用多谱参数求解了该方程的简并孤子解，得到了一些非弹性相互作用。弹性相互作用可以为高保真信息传输提供技术基础。非弹性相互作用在能量转换和信号处理中有着广泛的应用。本文有助于理解孤子在非线性介质中的传播特性。

{"title":"Degenerate soliton solutions and their dynamics in a coupled generalized nonlinear Schrödinger equations with the four-wave mixing effect","authors":"Dan-Yu Yang","doi":"10.1016/j.cjph.2025.08.002","DOIUrl":"10.1016/j.cjph.2025.08.002","url":null,"abstract":"<div><div>Energy distribution of the degenerate solitons is more concentrated, they are more resistant to external disturbances (such as the noise and dispersion). This paper investigates the degenerate soliton solutions for coupled generalized nonlinear Schrödinger equations with the four-wave mixing effect in a birefringent fiber. Since the interactions of degenerate solitons in this equations are not studied, this paper investigate the properties and inelastic interactions of degenerate solitons. We construct the two-, three- and four-degenerate soliton solutions with one and two spectral parameters. According to the asymptotic analysis method, we find that the amplitudes of the interacting solitons retain unchanged upon the interactions, thus the elastic interactions between two degenerate solitons are depicted. Relative distance between two asymptotic solitons exhibits logarithmic growth with <span><math><mrow><mo>|</mo><mi>t</mi><mo>|</mo></mrow></math></span>, where <span><math><mi>t</mi></math></span> represents the retarded time. Soliton separation acceleration decays exponentially with relative distance, eventually tends to zero. Phase shifts vary slowly with <span><math><mi>t</mi></math></span>. Elastic and inelastic interactions of three and four degenerate solitons with multiple iterations of one and two spectral parameters are presented. Different from the previous literary works, this paper solves the degenerate soliton solutions of this equations using the multiple spectral parameters and obtains some inelastic interactions. Elastic interactions may provide a technical foundation for the high fidelity information transmission. Inelastic interactions may have wide applications in the energy conversion and signal processing. This paper may be helpful for understanding the soliton propagation characteristics in the nonlinear media.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1204-1215"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-scale analysis of solute dispersion in a rotating electro-osmotic flow between two plates 两板间旋转电渗透流动中溶质分散的多尺度分析

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.11.011

Aruna A , Swarup Barik , Srinivas Jangili

This study utilizes the multiscale homogenization technique to analyze the two-dimensional concentration distribution of a solute in a rotating electro-osmotic flow through parallel plates. A solute injection is used to evaluate mass transport characteristics by deriving the dispersion coefficient, mean and two-dimensional concentration profiles for both primary and secondary flows. Previous studies have investigated solute dispersion in electro-osmotic flow using multi-scale homogenization. However, the influence of rotation remains largely unexplored, despite its significance in many Lab-on-Chip devices. The combined effect of rotation together with the applied electric field can lead to enhanced transport characteristics. The influence of the electro-osmotic parameter (K) and rotational frequency (ω) on the solute transport along both flows is studied. Results show that in the primary flow, the solute concentration exhibits fluctuations for varying K and ω values. For small K, velocity is confined near the boundaries, while rotation enhances transport and flattens concentration distributions. In secondary flow, the mean concentration decreases with increasing K and varies non-monotonically with ω, exerting a stronger influence than K in secondary flows. Importantly, the two-dimensional concentration distribution remains symmetrical and uniform across the channel cross-section along the primary and secondary flows over time (τ). Over time, the bimodal distribution of concentration variation transitions to an unimodal one across the cross-section in both flows. This study contributes to a better understanding of detecting the disease in blood, separation of chemicals, DNA molecules and plasma, which can be seen in a lab-on-a-chip devices.

本研究利用多尺度均质化技术分析了平行板旋转电渗透流动中溶质的二维浓度分布。溶质注入法通过推导一次流和二次流的分散系数、平均浓度和二维浓度分布来评估质量输运特性。以往的研究利用多尺度均质化技术研究了电渗透流动中溶质的分散。然而，旋转的影响在很大程度上仍未被探索，尽管它在许多芯片实验室设备中具有重要意义。旋转与外加电场的联合作用可导致输运特性的增强。研究了电渗透参数(K)和旋转频率（ω）对两种流体中溶质输运的影响。结果表明，在一次流动中，溶质浓度随K和ω值的变化而波动。对于较小的K，速度被限制在边界附近，而旋转增强输运并使浓度分布平坦化。在二次流中，平均浓度随K的增大而减小，且随ω呈非单调变化，对二次流的影响强于K。重要的是，随着时间的推移，沿一次流和二次流的二维浓度分布在通道横截面上保持对称和均匀（τ）。随着时间的推移，浓度变化的双峰分布在两个流动的横截面上转变为单峰分布。这项研究有助于更好地理解在血液中检测疾病、分离化学物质、DNA分子和血浆，这些都可以在芯片实验室设备上看到。

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引用次数: 0

Denoising gravitational wave with deep learning in the time-frequency domain 基于时频域深度学习的引力波降噪方法

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.11.013

Yi-De Lee, Hwei-Jang Yo

Gravitational wave denoising is an ongoing task for revealing the events of compact binary objects in the universe. Recently, with the aid of deep learning, gravitational waves have been efficiently and delicately extracted from the noisy data compared with the traditional match-filtering. While most of the relevant studies adopt the data in the time series only, the time-frequency data processing is also in progress due to its several advantages for the waveform denoising. Here, we target the gravitational waves events emitted by binary black hole (BBH) mergers, with their total mass larger than 30 solar masses. For denoising, we propose a deep learning model utilizing the Griffin-Lim algorithm, an existing numerical approach to restore the phase information from the related amplitude spectrogram. This design allows extra attention on the phase recovery by using a priorly denoised amplitude spectrogram. The denoising results fit well in both the amplitude and the phase alignments of the mock injected waveforms. We also apply our model to the real detected events and discover a nice consistency with the simulated template waveforms, especially the high accuracy around the merger stage. Our work suggests the possibility of a better methodological design for gravitational wave data analysis.

引力波去噪是揭示宇宙中紧密双星天体事件的一项持续任务。近年来，与传统的匹配滤波相比，利用深度学习技术可以有效、精细地从噪声数据中提取引力波。虽然大多数相关研究只采用时间序列的数据，但由于时频数据处理在波形去噪方面的诸多优势，它也在进行中。在这里，我们的目标是双黑洞（BBH）合并发出的引力波事件，它们的总质量大于30个太阳质量。对于去噪，我们提出了一种利用Griffin-Lim算法的深度学习模型，这是一种现有的数值方法，可以从相关振幅谱图中恢复相位信息。这种设计可以通过使用预先去噪的幅度谱图来对相位恢复进行额外的关注。降噪结果与模拟注入波形的幅度对准和相位对准吻合较好。将该模型应用于实际检测事件，结果表明该模型与模拟的模板波形具有较好的一致性，特别是在合并阶段前后的精度较高。我们的工作为引力波数据分析提供了更好的方法设计的可能性。

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引用次数: 0

An improved car-following model considering visual occlusion in heterogeneous traffic at signalized intersections 考虑信号交叉口异构交通视觉遮挡的改进车辆跟随模型

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.11.009

Tieqiao Tang , Yanzhe Zhao , Shangwu Wen , Mengxin Qin , Jian Zhang

Large vehicles at signalized intersections often obstruct traffic signal visibility, which forces small vehicle drivers to rely solely on preceding vehicle movements and increases collision risks. Existing car-following models inadequately address this visual occlusion phenomenon. This study develops a modeling framework by introducing three key innovations into the full velocity difference (FVD) model. First, a binary occlusion function

S

based on sight distance triangles is established to determine when visual obstruction occurs. Second, the vehicle driving strategy with the yellow light phase in the dilemma zone is integrated into the car-following model by using two binary functions

D

and

W

. Third, a spacing-dependent speed difference adjustment mechanism is proposed, where drivers modify their following behavior according to four decision rules based on vehicular spacing and relative velocity conditions by

γ

. For the purpose of quantifying the impact of this mechanism on traffic safety at signalized intersections, we developed an FVD model that incorporates the occlusion phenomenon (FVD-OP) for simulation analysis. To mitigate safety risks, an FVD-based spacing guidance strategy model (FVD-SG) is further developed that maintains safe following distances by adjusting acceleration through the parameter

μ

when occlusion is detected. Simulation results reveal that large vehicle penetration rates above 15 % significantly destabilize traffic flow, with traditional models showing DRAC reaching 6.09 m/s² under 20 % penetration. The proposed FVD-SG model reduces collision risks by up to 56.65 % while maintaining traffic efficiency, and can significantly reduce the percentage of vehicles trapped in a dilemma zone from 14.92 to 2.21 %. Sensitivity analysis identifies optimal parameter ranges (

γ

≤1.0,

μ

≤0.2) that ensure system stability across varying traffic conditions, demonstrating the model's effectiveness in addressing visual occlusion challenges in heterogeneous traffic flow.

在有信号的十字路口，大型车辆往往会阻碍交通信号的可见性，这迫使小型车辆驾驶员只能依靠前面的车辆运动，从而增加了碰撞风险。现有的汽车跟随模型不能充分解决这种视觉遮挡现象。本研究通过在全速度差（FVD）模型中引入三个关键创新，开发了一个建模框架。首先，建立基于视距三角形的二值遮挡函数S，判断何时发生视觉障碍；其次，利用二值函数D和w将困境区黄灯期车辆的行驶策略整合到车辆跟随模型中。第三，提出了一种基于间隔的速度差调整机制，驾驶员根据基于车辆间距和相对速度条件的4条决策规则通过γ调整其跟随行为。为了量化这一机制对信号交叉口交通安全的影响，我们开发了一个包含遮挡现象的FVD模型（FVD- op）进行仿真分析。为了降低安全风险，进一步开发了一种基于fvd的间距制导策略模型（FVD-SG），该模型在检测到遮挡时通过参数μ调节加速度来保持安全的跟随距离。仿真结果表明，15%以上的大车辆渗透率会显著破坏交通流的稳定性，传统模型显示，20%渗透率下的DRAC达到6.09 m/s2。提出的FVD-SG模型在保持交通效率的前提下，将碰撞风险降低了56.65%，并将陷入两难区的车辆比例从14.92%显著降低到2.21%。灵敏度分析确定了在不同交通条件下确保系统稳定性的最佳参数范围（γ≤1.0,μ≤0.2），证明了该模型在解决异构交通流中视觉遮挡挑战方面的有效性。

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引用次数: 0

Solute dispersion in nanofluid flow in a microvessel: A two-layered fluid model 微血管中纳米流体流动中的溶质分散：一个双层流体模型

IF 4.6 2区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Chinese Journal of Physics

Pub Date : 2025-12-01 DOI: 10.1016/j.cjph.2025.08.008

Ajani Ausaru , P. Nagarani , Andre Small , P.V.S.N. Murthy

This paper analyzes the solute dispersion process in pulsatile nanofluid flow, treated as a two-layered (Casson-Newtonian) flow in a microvessel. The peripheral layer is taken as a porous Newtonian fluid and the core layer as a Casson fluid. Flow equations are solved using the perturbation method. The generalized dispersion method was used to solve the convection-diffusion equation. The transport coefficients are obtained analytically in the case of no wall absorption. The mean concentration expression is obtained in terms of these transport coefficients. The impact of the yield stress of the fluid, the amplitude of the pulsatile pressure gradient, the nanoparticle volume fraction and diameter, the slip velocity parameter, the permeability parameter, plasma layer thickness, and microvessel diameter on the transport coefficients and mean concentration is analyzed. It is observed that the yield stress of the fluid, the amplitude of the pulsatile pressure gradient, the diameter of the microvessel, and the volume fraction of the nanoparticles have a substantial impact on both the dispersion coefficient and mean concentration of the solute. In contrast, the diameter of the nanoparticles did not exhibit any remarkable effect on these two quantities, whereas the other parameters showed some influence but not so significantly.

本文分析了脉动纳米流体中溶质的分散过程，将其视为微血管中的两层（卡森-牛顿）流动。外围层为多孔牛顿流体，岩心层为卡森流体。流动方程采用摄动法求解。采用广义色散法求解对流扩散方程。在无壁面吸收的情况下，解析得到了输运系数。平均浓度表达式是用这些输运系数表示的。分析了流体屈服应力、脉动压力梯度幅值、纳米颗粒体积分数和直径、滑移速度参数、渗透率参数、等离子体层厚度和微血管直径对输运系数和平均浓度的影响。结果表明，流体屈服应力、脉动压力梯度幅值、微血管直径和纳米颗粒体积分数对溶质的分散系数和平均浓度均有较大影响。相比之下，纳米颗粒的直径对这两个量没有任何显著影响，而其他参数对这两个量有一定影响，但不那么显著。

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引用次数: 0