Chinese Journal of Physics最新文献

{"title":"Multifractal and spatial correlation analysis of dengue transmission in Brazilian metropolitan regions","authors":"Leonardo H.S. Fernandes ,&nbsp;Jader S. Jale ,&nbsp;José P.V. Fernandes ,&nbsp;Benjamin Miranda Tabak ,&nbsp;Maria A.R. Silva","doi":"10.1016/j.cjph.2025.06.025","DOIUrl":"10.1016/j.cjph.2025.06.025","url":null,"abstract":"<div><div>This study investigates the spatial and temporal patterns of dengue incidence in three major Brazilian metropolitan regions: São Paulo, Rio de Janeiro, and Belo Horizonte. Our goal is to analyze the disease dynamics and its persistence in urban areas with different socio-environmental characteristics. We apply Multifractal Detrended Fluctuation Analysis (MF-DFA) and Moran’s Index to weekly incidence data from 2014 to 2024 to identify spatial clustering and long-term transmission patterns. Our results indicate persistent multifractal behavior in 10 cities <span><math><mfenced><mrow><msub><mrow><mi>α</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>&gt;</mo><mn>0</mn><mo>.</mo><mn>5</mn></mrow></mfenced></math></span>, suggesting that dengue transmission is influenced by factors beyond seasonality and climate. High Moran index values during outbreaks confirm significant spatial clustering, emphasizing the need for localized intervention strategies. By integrating temporal fluctuations with spatial concentration analysis, this study provides insights for more effective public health policies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 117-137"},"PeriodicalIF":4.6,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670851","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}

{"title":"Enhanced Birefringence Modes of surface plasmon polariton induced by a hybrid chiral QD medium","authors":"Fatima Ghulam Kakepoto ,&nbsp;Shihua Huang ,&nbsp;Fuad A. Awwad ,&nbsp;Emad A.A. Ismail ,&nbsp;Muhammad Idrees","doi":"10.1016/j.cjph.2025.06.041","DOIUrl":"10.1016/j.cjph.2025.06.041","url":null,"abstract":"<div><div>In this study, we propose a detailed theoretical approach to explore the birefringent surface plasmon polariton (SPP) modes at the interface of a hybrid nanostructure. This nanostructure comprises a gold (Au) metal layer combined with a chiral quantum dot (CQD) medium. The characteristics of SPP in this hybrid configuration are derived using detailed analytical methods based on Maxwell’s equations, with appropriate boundary conditions applied to ensure accuracy. Additionally, the dynamics of the CQD system are analyzed using the density matrix formalism, which enables a detailed description of the quantum interactions within the medium. Our analysis demonstrates that the birefringent SPP modes, discernible in both absorption and dispersion spectra, can be effectively controlled by manipulating key parameters such as inter-dot tunneling strength and spontaneous emission rates. This tunability also extends to the propagation length and phase shift of the birefringent SPP beams, which can be modulated under the same set of conditions. The ability to control these birefringent SPP modes offers significant potential for the development of advanced imaging systems and the design of compact, efficient nanophotonic devices. By utilizing the interaction between the CQD and the metallic interface, our study not only enhances the understanding of SPP behavior in hybrid nanostructures but also opens up new possibilities for the application of photonic technologies at the nanoscale. The engineering of these birefringent SPP modes could lead to substantial advancements in high-resolution imaging, the fabrication of novel photonic circuits, and other areas critical to the progression of nanophotonics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1344-1353"},"PeriodicalIF":4.6,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604868","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}

{"title":"Tunable contact properties in Cu2Te/metals via graphene interlayer","authors":"Minjun Zhou ,&nbsp;Xi Geng ,&nbsp;Xiao Fan ,&nbsp;Qiyun Deng ,&nbsp;Shiru Song ,&nbsp;Lei Gao","doi":"10.1016/j.cjph.2025.07.007","DOIUrl":"10.1016/j.cjph.2025.07.007","url":null,"abstract":"<div><div>The contact properties between two-dimensional (2D) channel materials and electrodes critically govern the overall performance of nanodevices. Recently fabricated semiconducting Cu₂Te monolayer with high carrier mobility and exceptional environmental stability is a promising channel material for high-performance nanodevices. Herein, the contact properties of Cu₂Te with various metals (Mo, W, Sb, Cu, and Ni) and the role of graphene interlayer in tailoring these interfaces are systematically investigated based on first-principles calculations. First-principles calculations reveal that, by intercalating graphene layers, the strong interactions between Cu₂Te and metallic electrodes (Mo, W, Cu, and Ni) are weakened, enabling tunable contact types via work function engineering. The n-type Ohmic contacts at Cu₂Te/Mo, Cu₂Te/W, and Cu₂Te/Cu interfaces transition to p-type behavior as the number of graphene layers increases, whereas Cu₂Te/Ni interfaces exhibit no contact-type switching. By decoupling Cu₂Te/metals, such graphene interlayers can suppress FLP and tailor contact types, which are beneficial for reconfigurable nanodevices. This work provides valuable theoretical insights for the development of high-performance Cu₂Te-based nanodevices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 109-116"},"PeriodicalIF":4.6,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144666077","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}

{"title":"Advances in fractional chaotic systems","authors":"Guo—Cheng Wu ,&nbsp;Subir Das","doi":"10.1016/j.cjph.2025.07.001","DOIUrl":"10.1016/j.cjph.2025.07.001","url":null,"abstract":"","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 1-2"},"PeriodicalIF":4.6,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047922","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}

{"title":"Particle production scenario in an algebraically coupled quintessence field with a dark matter fluid","authors":"Saddam Hussain","doi":"10.1016/j.cjph.2025.06.009","DOIUrl":"10.1016/j.cjph.2025.06.009","url":null,"abstract":"<div><div>We investigate the dynamics of an algebraically coupled quintessence field with a dark matter fluid, focusing on particle production through the action principle via a modified interaction Lagrangian. The interaction parameter serves as the source of dark matter particle production and entropy generation. As particle creation occurs due to the interaction between the field and fluid sectors, the system exhibits additional pressure. Our analysis includes studying the system’s dynamics by considering an exponential type of interaction corresponding to the field’s exponential potential. We assess the system’s background dynamics using the dynamical system stability technique to derive the constraints on the model parameters. Additionally, we determine the best-fit values of the model parameters against two combinations of data sets: (i) Cosmic Chronometer (CC) + Pantheon + SH0ES, and (ii) CC + Pantheon + SH0ES + SDSS BAO + DESI BAO. By employing a comprehensive data analysis technique, we compare the evidence of our models to flat <span><math><mi>Λ</mi></math></span>CDM. Based on the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC), one of the models emerges as a robust alternative to <span><math><mi>Λ</mi></math></span>CDM when considering the joint data sets.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 673-695"},"PeriodicalIF":4.6,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766997","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}

{"title":"Linear stability and parametric optimization of AA7075 nanofluid flow over an exponentially shrinking sheet under inclined magnetic field and thermal effects","authors":"Hemalatha Veedhuluri ,&nbsp;Ramreddy Chetteti ,&nbsp;Rashmi Dubey","doi":"10.1016/j.cjph.2025.06.037","DOIUrl":"10.1016/j.cjph.2025.06.037","url":null,"abstract":"&lt;div&gt;&lt;div&gt;This study investigates the linear temporal stability analysis of forced convection in water-based AA7075 nanofluid over an exponentially shrinking sheet, incorporating the effects of inclined magnetic field, Joule heating, and thermal radiation. Unlike previous studies that primarily focus on stability analysis, this research also explores the sensitivity of response functions. The governing ordinary differential equations, obtained via similarity transformations, are solved using MATLAB’s bvp4c solver. A parametric study is conducted over a range of physical parameters including magnetic parameter &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;M&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, inclination angle &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;γ&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, suction parameter &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, shrinking parameter &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, AA7075 nanoparticle volume fraction &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;ϕ&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, radiation parameter &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and Joule heating parameter &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;J&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. The analysis reveals multiple solutions for certain parameter ranges and a saddle–node bifurcation is observed. Further, stability analysis confirms that only the first solution branch is stable and physically reliable. Increasing &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;M&lt;/mi&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and &lt;span&gt;&lt;math&gt;&lt;mi&gt;γ&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt; delays boundary layer separation. In the first solution, the gradient of velocity at the wall, represented by the skin friction coefficient, increases by 10.76%, 8.19%, and 8.23% with increasing magnetic parameter &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;M&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, suction parameter &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, and inclination angle &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;γ&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, respectively. The incorporation of AA7075 nanoparticles into the base fluid results in a 48.28% enhancement in the temperature gradient at the wall, reflected through the Nusselt number, in the first (stable) solution. Additionally, the Joule heating &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;J&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and thermal radiation &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; parameters contribute to an increase in the wall temperature gradient by 13.7% and 11.9%, respectively, indicating improved thermal transport efficiency. Sensitivity analysis using Response Surface Methodology (RSM) identifies nanoparticle volume fraction as the most influential parameter, with a desirability index of 63.9% yielding optimal values of drag coefficient (2.20139) and Nusselt number (13.6657). The results are validated against limiting cases from the existing literature and show excellent","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1470-1490"},"PeriodicalIF":4.6,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655122","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}

{"title":"Prediction of axial ratio using machine learning (ML) for a dual-band circularly polarized dielectric resonator antenna (DRA)","authors":"Sachin Kumar Yadav ,&nbsp;Anupma Gupta ,&nbsp;Vipan Kumar ,&nbsp;Dinesh Kumar Garg ,&nbsp;Ahmed J.A. Al-Gburi","doi":"10.1016/j.cjph.2025.07.008","DOIUrl":"10.1016/j.cjph.2025.07.008","url":null,"abstract":"<div><div>In this paper, an asymmetrical dielectric resonator antenna (DRA) is designed to achieve circular polarization at dual frequencies within the C-band (4–8 GHz) and X-band (8–12 GHz) ranges. A regression-based machine learning (ML) technique is employed to predict the antenna’s axial ratio. The DRA structure consists of three rectangular ceramic blocks with a uniform permittivity of 9.8 and is excited by a microstrip feedline. Two dielectric resonators (DRs) of different heights are placed on the same plane, while the third DR is positioned atop the first two with a 60° rotation, enabling a wide 3 dB axial ratio (AR) bandwidth across both bands. The antenna operates from 5.2 GHz to 12.0 GHz, achieving a 10 dB impedance bandwidth of 79%. The AR bandwidth (≤ 3 dB) spans two bands: 6.0–8.7 GHz (lower band) and 9.9–11.8 GHz (upper band). The antenna maintains a gain of over 4 dBi throughout the bandwidth. Additionally, the antenna is analyzed in an array configuration, and beam steering at 30° is demonstrated through simulation. A dataset comprising various antenna dimensions and their corresponding axial ratio values is generated using parametric sweep analysis. A supervised regression-based ML approach is then employed to predict the axial ratio at two circularly polarized frequencies: 7.2 GHz and 10.5 GHz. Several regression algorithms are tested, and the Extra Trees Regression model achieves the lowest prediction error and highest accuracy.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1364-1384"},"PeriodicalIF":4.6,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632008","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}

{"title":"Quantized sampled-data control for synchronization of switching stochastic neural networks with time-varying delays and random packet dropouts: Application to secure communications","authors":"M. Kamali,&nbsp;A. Chandrasekar","doi":"10.1016/j.cjph.2025.06.033","DOIUrl":"10.1016/j.cjph.2025.06.033","url":null,"abstract":"<div><div>This paper investigates the synchronization problem of stochastic neural networks (SNNs) characterized by Markovian switching parameters and time-varying delays (TVDs), within the framework of physical systems. In such systems, signal transmission between neurons is often influenced by intrinsic challenges such as time delays, external disturbances and uncertain parameters, all of which may degrade system performance and communication efficiency. To address these issues, a quantized memory sampled-data control (QMSDC) approach is proposed to enhance the robustness and physical realism of neural network models. A novel looped-type Lyapunov functional (LTLF) is constructed, integrating both sampling information and the effects of quantized communication and transmission delays. Based on Jensen’s integral inequality, sufficient synchronization conditions are derived under probabilistic packet loss and are formulated as linear matrix inequalities (LMIs) to facilitate numerical verification. The effectiveness of the proposed method is demonstrated through numerical simulations, which confirm improved synchronization performance in delayed SNNs operating in physical environments. Furthermore, the chaotic dynamics inherent to such delayed systems are exploited to develop a secure communication scheme. The security aspect is validated through statistical analyses on standard benchmark images, verifying the protocol’s capability in ensuring reliable and confidential information transmission in physical neural systems.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 168-187"},"PeriodicalIF":4.6,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144679543","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}

{"title":"Constructing regular stepped helices confined in carbon nanotubes with junctions","authors":"Rui Wang ,&nbsp;Xueyin Yang ,&nbsp;Yunfang Li ,&nbsp;Xiaolin Zhao","doi":"10.1016/j.cjph.2025.07.004","DOIUrl":"10.1016/j.cjph.2025.07.004","url":null,"abstract":"<div><div>Molecular dynamics simulations have been performed to investigate the confinement of coaxial single-walled carbon nanotubes with different diameters connected by junctions (J-CNTs) on one-dimensional poly(para)phenylene (PPP) polymer chains. The PPP chains enter the J-CNTs spontaneously and display a stepped helical configuration taking J-CNTs as template. The dynamics process, the variation of the total potential energy including various energy components and the constructed stepped helix are studied to reveal the evolution of microstructure, formation and driving mechanism. Besides, the influence of diameter and length of J-CNTs, the length and chain number of PPP polymer, and the number of junctions on the helical insertion and the construction of stepped helices is deeper studied. The expected outcome provides novel strategies for designing nanoscale regular stepped helices from polymer chains and applied to nanodevices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1314-1328"},"PeriodicalIF":4.6,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597508","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}

{"title":"Multiphase flow dynamics analysis in jet cavitation nozzles: a novel approach for optimizing oily sludge treatment efficiency","authors":"Hanshuo Yang ,&nbsp;Dexi Wang ,&nbsp;Yali Yang ,&nbsp;Jiuchuang Jiang ,&nbsp;Honglei Yu ,&nbsp;Shengdong Li ,&nbsp;Jinyuan Guo","doi":"10.1016/j.cjph.2025.07.003","DOIUrl":"10.1016/j.cjph.2025.07.003","url":null,"abstract":"<div><div>The mixed multiphase flow model, RNG (Re-normalization group) <em>k-ε</em> turbulence model and Schnerr and Sauer cavitation dynamics model were used to numerically simulate the flow field of a jet cavitation nozzle, and the influence of the nozzle structure on the cavitation intensity was studied. The actual effect of three types of throat diameter nozzles in the treatment of oily sludge was explored. The simulation results show that the cavitation effect is best when the nozzle throat diameter is 0.4 mm, the diffusion angle is 50°, the contraction length is 8 mm, and the diffusion length is 6 mm. The experimental results show that in the case of a nozzle with a throat diameter of 0.4 mm, the oil content of the oily sludge after cavitation is reduced from 24.9 % to 9.8 %, and the total petroleum hydrocarbon (TPH) content is reduced by 84.8 %.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"96 ","pages":"Pages 1303-1313"},"PeriodicalIF":4.6,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588408","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}