Results in Physics最新文献_第7页

Stochastic extension of a two-strain SIR model with non-monotone incidence functions: Analysis of stochastic thresholds and disease dynamics 具有非单调关联函数的双应变SIR模型的随机扩展：随机阈值和疾病动力学分析

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-20 DOI: 10.1016/j.rinp.2025.108396

Dounia Bentaleb, Saida Amine

引用次数: 0

Controlling the S/(S + Se) ratio in Co-doped CZTSSe films via optimizing the annealing condition for highly efficient solar cells 通过优化高效太阳能电池的退火条件来控制共掺杂CZTSSe薄膜中的S/(S + Se)比

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-20 DOI: 10.1016/j.rinp.2025.108406

Zhanwu Wang , Meiling Ma , Hongduo Wu , Yingrui Sui

{"title":"Controlling the S/(S + Se) ratio in Co-doped CZTSSe films via optimizing the annealing condition for highly efficient solar cells","authors":"Zhanwu Wang , Meiling Ma , Hongduo Wu , Yingrui Sui","doi":"10.1016/j.rinp.2025.108406","DOIUrl":"10.1016/j.rinp.2025.108406","url":null,"abstract":"<div><div>Selenium-rich Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub> (CZTSSe) absorber with large-grained structure is a significant contribution to the preparation of efficient CZTSSe solar cells. Therefore, it is important to find an applicablemethod to adjust the S/(S + Se) ratio in CZTSSe films. Here, the influence of annealing temperature and time on the regulation of S/(S + Se) ratio in the absorption layer was studied based on the preparation of Co-doped CZTSSe films by sol–gel method. The results show that the ratio of S/(S + Se) in Co-doped CZTSSe films decreases with increasing annealing temperature and time. Adjusting the S/(S + Se) ratio can significantly improve the surface morphology of the Co-doped CZTSSe absorber and passivate the grain boundary defects. Co-doped CZTSSe films have the best surface morphology under the optimal annealing conditions of 560 °C for 15 min, which significantly inhibits Cu<sub>Zn</sub> antisite defects and [2Cu<sub>Zn</sub> + Sn<sub>Zn</sub>] defect clusters. At last, the Co-doped CZTSSe solar cells with the highest efficiency of 7.46 % were obtained under the optimum annealing condition. The optimal filling factor reaches 62.10 %, which is at the high level of the reported kesterite solar cells.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108406"},"PeriodicalIF":4.6,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902283","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

Optimizing dielectric properties of corannulene nanomaterial for enhanced performance of next-generation electric vehicle batteries: A Machine learning and Nelder-Mead optimization approach 优化环烯纳米材料的介电性能以增强下一代电动汽车电池的性能：一种机器学习和Nelder-Mead优化方法

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-19 DOI: 10.1016/j.rinp.2025.108404

Upendra Kumar Potnuru , Lakshmana Rao Kalabarige , Manohar Mishra , Thirumala Rao Gurugubelli , Salman S Alharthi , Mohan Rao Tamtam , Ravindranadh Koutavarapu

{"title":"Optimizing dielectric properties of corannulene nanomaterial for enhanced performance of next-generation electric vehicle batteries: A Machine learning and Nelder-Mead optimization approach","authors":"Upendra Kumar Potnuru , Lakshmana Rao Kalabarige , Manohar Mishra , Thirumala Rao Gurugubelli , Salman S Alharthi , Mohan Rao Tamtam , Ravindranadh Koutavarapu","doi":"10.1016/j.rinp.2025.108404","DOIUrl":"10.1016/j.rinp.2025.108404","url":null,"abstract":"<div><div>Enhancing the performance of next-generation electric vehicle (EV) batteries relies on advancements in energy storage technologies. This study explores the potential of corannulene, a nanomaterial renowned for its exceptional electronic properties, to optimize battery performance by fine-tuning its dielectric properties. Traditionally, such optimization methods have been limited to conventional approaches. However, this research adopts a novel machine learning methodology utilizing an experimental dataset encompassing five key features: “frequency,” “real part,” “imaginary part,” “dielectric strength,” and “dielectric loss.” These features are employed to train various machine learning models, including baseline, ensemble-tree, and boosting techniques, with the aim of predicting optimal values for dielectric loss (to minimize negative impact) and dielectric strength (to maximize efficiency). Subsequently, a Nelder-Mead optimization algorithm, coupled with a stacking model, is employed to determine the optimal range for these features, thereby enhancing battery performance. Promising results are obtained, with Ensemble Tree Regression (ETR) and Stacking models achieving remarkable R<sup>2</sup> scores of 0.9973 and 0.9995 for predicting dielectric loss and dielectric strength, respectively. The Nelder-Mead optimization, guided by these machine learning models, effectively recommends optimal ranges for corannulene nanomaterial properties. Notably, ETR and Stacking based optimization outperform other models. This integrated machine learning and optimization approach represents a significant step toward designing not only more efficient but also more sustainable EV batteries, thereby accelerating the automotive industry’s transition to a greener future.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108404"},"PeriodicalIF":4.6,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144893183","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

Anisotropic manipulation of subterahertz spin waves by spin orbit torque in the antiferromagnetic orthoferrite 反铁磁正铁氧体中自旋轨道转矩对亚太赫兹自旋波的各向异性操纵

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-19 DOI: 10.1016/j.rinp.2025.108400

T.H. Kim , Jung-Il Kim , Geun-Ju Kim , Kwang-Ho Jang , Sangwan Sim , G.-M. Choi

{"title":"Anisotropic manipulation of subterahertz spin waves by spin orbit torque in the antiferromagnetic orthoferrite","authors":"T.H. Kim , Jung-Il Kim , Geun-Ju Kim , Kwang-Ho Jang , Sangwan Sim , G.-M. Choi","doi":"10.1016/j.rinp.2025.108400","DOIUrl":"10.1016/j.rinp.2025.108400","url":null,"abstract":"<div><div>We theoretically and numerically elucidate the electrical control over spin waves in antiferromagnetic (AFM) orthoferrite with biaxial anisotropies and Dzyaloshinskii-Moriya interactions. In orthoferrites, a canted AFM manifests as a bifurcated spin wave dispersion relation with distinct high-frequency and low-frequency spin wave bands. By deriving an effective coupled pendulum model, we demonstrate that the two spin wave bands are intrinsically coupled, with the coupling strength significantly enhanced under strong spin–orbit torque (SOT). The efficiency of frequency control is found to be inversely proportional to the effective potential energy, which is determined by anisotropy and DM interaction energies. Utilizing a heterostructure comprised of platinum, ferromagnet, and a canted AFM, we demonstrate anisotropic control of spin-wave bands via spin currents with three-dimensional spin polarizations, encompassing both resonant and propagating wave modes. Moreover, leveraging the confined geometry, we explore the possibility of controlling spin waves within a spectral domain ranging from tens of gigahertz to sub-terahertz frequencies. The implications of our findings suggest the potential for developing a terahertz wave source with electrical tunability, thereby facilitating its incorporation into ultrafast, broadband, and wireless communication technologies.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108400"},"PeriodicalIF":4.6,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144912620","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

Impact of single domain configuration on photocatalytic dye removal in cerium-substituted cobalt ferrite nanoparticles 单畴结构对铈取代钴铁氧体纳米粒子光催化脱除染料的影响

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-19 DOI: 10.1016/j.rinp.2025.108405

Dede Djuhana , Candra Kurniawan , Adiana Musadewi , Nurdiyantoro Putra Prasetya , Utari , Suharno , Dong-Hyun Kim , Budi Purnama

{"title":"Impact of single domain configuration on photocatalytic dye removal in cerium-substituted cobalt ferrite nanoparticles","authors":"Dede Djuhana , Candra Kurniawan , Adiana Musadewi , Nurdiyantoro Putra Prasetya , Utari , Suharno , Dong-Hyun Kim , Budi Purnama","doi":"10.1016/j.rinp.2025.108405","DOIUrl":"10.1016/j.rinp.2025.108405","url":null,"abstract":"<div><div>This paper discusses the impact of single domain realization on the performance of dye removal-photocatalyst of Congo Red. Cerium-substituted cobalt ferrite (CoCe<sub>0.1</sub>Fe<sub>1.9</sub>O<sub>4</sub>) nanoparticles preparing coprecipitation-route with varying annealing temperatures were used in this experiment. The XRD characterization and Rietveld-fullprof analysis showed that the diffraction pattern was in accordance with ICDD no. ICDD 22–1086 showed a face-centered cubic (fcc) structure with a space group of Fd-3 m, which is the pristine crystalline structure of cobalt ferrite. Calculation of the crystallite size <em>D</em> in hkl (311) orientation using the Scherer equation shows that increasing the annealing temperature promotes a larger of the <em>D</em>. The FTIR results show the presence of two typical absorption peaks within the range of <em>v</em><sub>1</sub> ∼ 400/cm and <em>v</em><sub>2</sub> ∼ 600/cm which indicates the absorption of metal oxide belonging to spinel cobalt ferrite. VSM results show that the magnetic properties are modified by annealing temperature. The largest coercive field <em>H</em><sub>c</sub> = 3.62 kOe for the non-annealed (NA) sample indicated the presence of a single domain configuration. TEM results show the presence of fine nanoclusters for the NA sample and disappear after the annealing process, which is indicated to support the presence of a single domain configuration. Micromagnetic simulations were also performed to evaluate the effect of domain configuration (single or multi domain) on the coercive field. Finally, the NA sample presented the highest dye removal performance of 97.47 %, which suggested the contribution of single domain realization in the photocatalytic process.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108405"},"PeriodicalIF":4.6,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144893302","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

Electrical performance of Schottky diodes based on macroporous silicon and titanium oxide extracted from Malagasy ilmenite 基于从马达加斯加钛铁矿中提取的大孔硅和氧化钛的肖特基二极管的电性能

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-19 DOI: 10.1016/j.rinp.2025.108403

Andry-zo Randrianantoandro , Mehdi Rahmani , Aymen Selmi , Rabesiranana Naivo , Abdelaziz Meftah

{"title":"Electrical performance of Schottky diodes based on macroporous silicon and titanium oxide extracted from Malagasy ilmenite","authors":"Andry-zo Randrianantoandro , Mehdi Rahmani , Aymen Selmi , Rabesiranana Naivo , Abdelaziz Meftah","doi":"10.1016/j.rinp.2025.108403","DOIUrl":"10.1016/j.rinp.2025.108403","url":null,"abstract":"<div><div>This work presents the synthesis and electrical characterization of Schottky diodes based on Ag/TiO<sub>2</sub>/macroporous silicon (MPS), where titanium dioxide is extracted from Malagasy ilmenite. The MPS structures were fabricated using a silver-assisted chemical etching method, and TiO<sub>2</sub> was deposited by immersion in an acid-based solution for various durations. Structural analyses via FTIR, Raman spectroscopy, and XRD confirmed the successful deposition of TiO<sub>2</sub> on MPS surface, revealing the coexistence of anatase, rutile, and brookite phases for titanium dioxide. Electrical performance was evaluated through current–voltage (I-V) and capacitance–voltage (C-V) measurements. The diode characteristics such as ideality factor, series resistance, and barrier height were found to be strongly dependent on immersion time. Optimal diode behavior, including enhanced rectification and reduced series resistance, was observed for immersion times between 5 and 15 min. Frequency-dependent C–V and conductance–voltage (G–V) measurements indicated significant interfacial effects and charge trapping phenomena. These findings highlight the potential of TiO<sub>2</sub>-modified MPS structures for advanced electronic and optoelectronic applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108403"},"PeriodicalIF":4.6,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888933","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

Strain-engineered optical gain in GaAs0.4Sb0.6/InP0.9Sb0.1 type-II heterostructures for near-infrared nano-optoelectronics 近红外纳米光电器件中GaAs0.4Sb0.6/InP0.9Sb0.1型异质结构的应变工程光学增益

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-18 DOI: 10.1016/j.rinp.2025.108401

Amit Rathi , Priya Chaudhary , Amit Kumar Goyal

{"title":"Strain-engineered optical gain in GaAs0.4Sb0.6/InP0.9Sb0.1 type-II heterostructures for near-infrared nano-optoelectronics","authors":"Amit Rathi , Priya Chaudhary , Amit Kumar Goyal","doi":"10.1016/j.rinp.2025.108401","DOIUrl":"10.1016/j.rinp.2025.108401","url":null,"abstract":"<div><div>This study investigates the enhancement of optical gain in type-II GaAs<sub>0.4</sub>Sb<sub>0.6</sub>/InP<sub>0.6</sub>Sb<sub>0.1</sub> nanoscale heterostructures under externally applied uniaxial strain for potential applications in near-infrared optoelectronic devices. Using the 6 × 6 Luttinger-Kohn model within the k·p perturbation framework, we analyze the band structure, envelope wavefunctions, and transition matrix elements at 300 K. Without strain, an optical gain of 13,631 cm<sup>−1</sup> is observed at an injected carrier concentration of 5 × 10<sup>12</sup> cm<sup>−2</sup>. Applying external strain (2, 4, and 6 GPa) along the [100] and [001] crystallographic directions significantly enhance the optical gain within the infrared spectral range. Temperature- and strain-dependent gain simulations in x-polarization further confirm the heterostructure’s efficacy in supporting near-infrared emission. These results highlight the potential of the GaAsSb/InPSb heterostructure as a promising candidate for strain-tunable, high-performance nano-optoelectronic and laser applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108401"},"PeriodicalIF":4.6,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886621","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

Intensity correlations in scattered vector vortex beams for determining the topological charge 用于确定拓扑电荷的散射矢量涡旋光束的强度相关性

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-18 DOI: 10.1016/j.rinp.2025.108398

Patnala Vanitha, Do-Kyeong Ko

引用次数: 0

Analysis of a hybrid SIR epidemic model driven by dual white noises and Markovian switching 双白噪声和马尔可夫切换驱动SIR流行病混合模型分析

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-16 DOI: 10.1016/j.rinp.2025.108385

Lahcen Boulaasair , Hassane Bouzahir , Refka Sai , Muneerah A. Alaqeel

{"title":"Analysis of a hybrid SIR epidemic model driven by dual white noises and Markovian switching","authors":"Lahcen Boulaasair , Hassane Bouzahir , Refka Sai , Muneerah A. Alaqeel","doi":"10.1016/j.rinp.2025.108385","DOIUrl":"10.1016/j.rinp.2025.108385","url":null,"abstract":"<div><div>This work investigates a stochastic SIR epidemic model driven by two independent white noises and Markovian regime switching. The system’s dynamics, particularly the conditions for disease elimination and long-term persistence, are rigorously investigated through the analysis of a mean-reverting process incorporating multiplicative noise and regime-switching dependent parameters. The key contribution of this work is the explicit derivation of the stationary and ergodic probability density function for this process, a result that has not been previously achieved. These findings provide novel and significant insights into the behavior of stochastic epidemic systems, offering advanced analytical tools to characterize the long-term dynamics of infectious diseases in environments subject to random fluctuations and abrupt changes. To provide credible confirmation of the theoretical results obtained, we will rely on numerical simulations of the solution trajectories, along with numerical verification of stationarity and ergodicity of the mean-reverting process with telegraph noise and multiplicative white noises.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108385"},"PeriodicalIF":4.6,"publicationDate":"2025-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144866035","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

Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source 基于NEPCM悬浮和旋转星形热源的梯形腔内MHD混合对流换热参数化研究

IF 4.6 2区物理与天体物理

Results in Physics Pub Date : 2025-08-14 DOI: 10.1016/j.rinp.2025.108397

Aissa Abderrahmane , Houssem Laidoudi , Abdeldjalil Belazreg , Obai Younis , Hamoud A. Al-Nehari , Riadh Marzouki

{"title":"Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source","authors":"Aissa Abderrahmane , Houssem Laidoudi , Abdeldjalil Belazreg , Obai Younis , Hamoud A. Al-Nehari , Riadh Marzouki","doi":"10.1016/j.rinp.2025.108397","DOIUrl":"10.1016/j.rinp.2025.108397","url":null,"abstract":"<div><div>A comprehensive numerical investigation of two-dimensional, steady, laminar magneto–hydrodynamic (MHD) mixed convection in a trapezoidal cavity filled with a nano-encapsulated phase–change material (NEPCM) suspension is presented. A star‑shaped heat source located at the cavity centre rotates with a constant angular velocity, while a uniform transverse magnetic field acts on the flow. The physical model couples the energy equation with a temperature–dependent effective specific heat formulation to represent the phase transition of NEPCM particles. The dimensionless governing equations are solved using a Galerkin weighted residual finite‑element method. Detailed parametric studies are carried out for Reynolds number Re = 10–1000, Darcy number Da = 10<sup>−6</sup>–10<sup>−2</sup>, Hartmann number Ha = 0–100 and NEPCM volume fraction φ = 0–0.08. Grid independence and code verification against benchmark solutions are demonstrated. Results reveal that increasing Re and Da enhances the average Nusselt number by up to 47 % and 23 %, respectively, whereas an 8 % NEPCM loading yields a modest ≈2 % enhancement due to increased slurry viscosity. Lorentz forces progressively damp convective rolls, reducing heat transfer at Ha > 40. The unique combination of a rotating internal heater, complex cavity geometry, and phase‑change suspension provides new insights for the design of compact thermal energy‑storage and electronics‑cooling devices.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"76 ","pages":"Article 108397"},"PeriodicalIF":4.6,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144866032","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