Pub Date : 2025-12-01DOI: 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.
{"title":"First-principles study of the electronic and gas adsorption properties of one dimensional single-chain GaXY (X = S, Se; Y = F, Cl, Br, I)","authors":"Lanyin Liu , Xinghong Cai , Ziyi Ran , Qun Hui , Min Wang","doi":"10.1016/j.cjph.2025.11.015","DOIUrl":"10.1016/j.cjph.2025.11.015","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1024-1033"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614688","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}
Pub Date : 2025-12-01DOI: 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。
{"title":"Structural, electronic, magnetic, half-metallic, and thermoelectric properties of a novel rare rarth-based quaternary Heusler compounds","authors":"Saadi Berri , Ayache Mebarek Azzem , Djamel Maouche , Çağatay Yamçıçıer","doi":"10.1016/j.cjph.2025.11.008","DOIUrl":"10.1016/j.cjph.2025.11.008","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1103-1115"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614687","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}
Pub Date : 2025-12-01DOI: 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 , where represents the retarded time. Soliton separation acceleration decays exponentially with relative distance, eventually tends to zero. Phase shifts vary slowly with . 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.
{"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}
Pub Date : 2025-12-01DOI: 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.
{"title":"Electrothermal flow of CNT-blood on a sensor plate with ramping shear and thermal flux: Electromagnetic biosensor applications","authors":"Sanatan Das , Poly Karmakar , Biswajit Mandal , Chanchal Mandal , Rabindra Nath Jana","doi":"10.1016/j.cjph.2025.10.029","DOIUrl":"10.1016/j.cjph.2025.10.029","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1084-1102"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614684","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}
Pub Date : 2025-12-01DOI: 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.
{"title":"Multi-scale analysis of solute dispersion in a rotating electro-osmotic flow between two plates","authors":"Aruna A , Swarup Barik , Srinivas Jangili","doi":"10.1016/j.cjph.2025.11.011","DOIUrl":"10.1016/j.cjph.2025.11.011","url":null,"abstract":"<div><div>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 (<em>K</em>) and rotational frequency (<em>ω</em>) on the solute transport along both flows is studied. Results show that in the primary flow, the solute concentration exhibits fluctuations for varying <em>K</em> and <em>ω</em> values. For small <em>K</em>, velocity is confined near the boundaries, while rotation enhances transport and flattens concentration distributions. In secondary flow, the mean concentration decreases with increasing <em>K</em> and varies non-monotonically with <em>ω</em>, exerting a stronger influence than <em>K</em> 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 (<em>τ</em>). 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.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1165-1192"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614681","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}
Pub Date : 2025-12-01DOI: 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.
{"title":"Denoising gravitational wave with deep learning in the time-frequency domain","authors":"Yi-De Lee, Hwei-Jang Yo","doi":"10.1016/j.cjph.2025.11.013","DOIUrl":"10.1016/j.cjph.2025.11.013","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1069-1083"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614683","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}
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 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 and . 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 . 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 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 (≤1.0, ≤0.2) that ensure system stability across varying traffic conditions, demonstrating the model's effectiveness in addressing visual occlusion challenges in heterogeneous traffic flow.
{"title":"An improved car-following model considering visual occlusion in heterogeneous traffic at signalized intersections","authors":"Tieqiao Tang , Yanzhe Zhao , Shangwu Wen , Mengxin Qin , Jian Zhang","doi":"10.1016/j.cjph.2025.11.009","DOIUrl":"10.1016/j.cjph.2025.11.009","url":null,"abstract":"<div><div>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 <span><math><mi>S</mi></math></span> 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 <span><math><mi>D</mi></math></span> and <span><math><mi>W</mi></math></span>. 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 <span><math><mi>γ</mi></math></span>. 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 <span><math><mi>μ</mi></math></span> 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/s<sup>2</sup> 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 (<span><math><mi>γ</mi></math></span>≤1.0, <span><math><mi>μ</mi></math></span>≤0.2) that ensure system stability across varying traffic conditions, demonstrating the model's effectiveness in addressing visual occlusion challenges in heterogeneous traffic flow.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1053-1068"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614693","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}
Pub Date : 2025-12-01DOI: 10.1016/j.cjph.2025.08.018
Jie Zhang, Jiliang Lv, Xiaodong Wei
This paper proposes an improved memristor model and constructs a chaotic system using the cellular neural network (CNN) framework. The system’s complex dynamic behavior is investigated through Lyapunov exponents, bifurcation diagrams, and time series analysis. Furthermore, a circuit simulation is carried out to implement the proposed system. This paper presents the Julia fractal theory and uses this method to generate multi-scroll attractors. Finally, predefined-time sliding mode synchronization is proposed, and its effectiveness is verified through simulation.
{"title":"Design of multi-scroll attractors in a memristive CNN chaotic system incorporating Julia fractal and its predefined-time sliding mode synchronization","authors":"Jie Zhang, Jiliang Lv, Xiaodong Wei","doi":"10.1016/j.cjph.2025.08.018","DOIUrl":"10.1016/j.cjph.2025.08.018","url":null,"abstract":"<div><div>This paper proposes an improved memristor model and constructs a chaotic system using the cellular neural network (CNN) framework. The system’s complex dynamic behavior is investigated through Lyapunov exponents, bifurcation diagrams, and time series analysis. Furthermore, a circuit simulation is carried out to implement the proposed system. This paper presents the Julia fractal theory and uses this method to generate multi-scroll attractors. Finally, predefined-time sliding mode synchronization is proposed, and its effectiveness is verified through simulation.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1141-1164"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614682","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}
Pub Date : 2025-12-01DOI: 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.
{"title":"Solute dispersion in nanofluid flow in a microvessel: A two-layered fluid model","authors":"Ajani Ausaru , P. Nagarani , Andre Small , P.V.S.N. Murthy","doi":"10.1016/j.cjph.2025.08.008","DOIUrl":"10.1016/j.cjph.2025.08.008","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1216-1246"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733159","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}
Pub Date : 2025-12-01DOI: 10.1016/j.cjph.2025.11.002
Wei-Min Shi , Ling-shuo Sun , Yi-Hua Zhou , Yu-Guang Yang
We propose a scheme for teleporting an arbitrary single-qubit unitary operation U without relying on quantum state teleportation. The proposed scheme decomposes an arbitrary single-qubit operation U into a combination of quantum rotation gates and uses a four-qubit entangled resource and three classical communication channels. The operation is remotely implemented through local operations and measurements. Since the target state is never reconstructed at the sender’s side, the scheme ensures information security while reducing quantum resource consumption compared with existing approaches.
{"title":"Arbitrary single-qubit operation teleportation without quantum teleportation","authors":"Wei-Min Shi , Ling-shuo Sun , Yi-Hua Zhou , Yu-Guang Yang","doi":"10.1016/j.cjph.2025.11.002","DOIUrl":"10.1016/j.cjph.2025.11.002","url":null,"abstract":"<div><div>We propose a scheme for teleporting an arbitrary single-qubit unitary operation <em>U</em> without relying on quantum state teleportation. The proposed scheme decomposes an arbitrary single-qubit operation <em>U</em> into a combination of quantum rotation gates and uses a four-qubit entangled resource and three classical communication channels. The operation is remotely implemented through local operations and measurements. Since the target state is never reconstructed at the sender’s side, the scheme ensures information security while reducing quantum resource consumption compared with existing approaches.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1034-1045"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614690","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}
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