Results in Physics最新文献

{"title":"Chaotic analysis and a damped oscillator solitary wave structures to the generalized reaction Duffing model","authors":"Ghulam Hussain Tipu ,&nbsp;Waqas Ali Faridi ,&nbsp;Muhammad Bilal Riaz ,&nbsp;Fengping Yao ,&nbsp;Usman Younas ,&nbsp;Mubariz Garayev","doi":"10.1016/j.rinp.2025.108203","DOIUrl":"10.1016/j.rinp.2025.108203","url":null,"abstract":"<div><div>The aim of this research is to obtain soliton solutions for the generalized reaction Duffing model, a framework that generalizes many important models that illustrate key phenomena in science and engineering. In contrast to regular harmonic motion, this equation describes the motion of a damped oscillator with a more complex potential. We used the Kumar–Malik method in this work to obtain analytical solutions for the generalized reaction Duffing model, which is the first time this method has been used to extract soliton solutions in this particular setting. The equation is first reformulated as a nonlinear ordinary differential equation using traveling wave transformation. The approach proves particularly effective in handling nonlinear partial differential equations, yielding hyperbolic, Jacobi elliptic, trigonometric, and exponential function solutions under appropriate parameter constraints. A variety of innovative solutions emerge, including periodic wave solutions, dark compacton waves, kink waves, singular kink waves, bright solitons, breather waves, and singular-shaped solitons via the Kumar–Malik method. The solutions are then shown visually to demonstrate the wave behavior under various conditions. Our findings enhance the comprehension of the Duffing equation’s behavior across different physical contexts. The research uses extensive 2D and 3D graphic plot solutions of the proposed solutions for a better graphical understanding of the physical perimeters of solutions and proves the feasibility of the proposed method in solving complex nonlinear equations. The Chaotic analysis has also been discussed by perturbation term and initial conditions. It is important to note that the proposed methods are competent, credible, and interesting analytical tools for solving nonlinear partial differential equations. In addition, these solutions represent a valuable resource for the understanding of the complex behavior of physical systems, as well as for inspiring future research.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108203"},"PeriodicalIF":4.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a computational model for variable-order fractional Brownian motion and solving associated stochastic integral equations using barycentric rational interpolants","authors":"Shiva Naserifar,&nbsp;Farshid Mirzaee,&nbsp;Erfan Solhi","doi":"10.1016/j.rinp.2025.108199","DOIUrl":"10.1016/j.rinp.2025.108199","url":null,"abstract":"<div><div>This study introduces a novel numerical method for approximating variable-order fractional Brownian motion, representing a significant advancement in the field of stochastic processes. The proposed method enhances the modeling accuracy of complex phenomena by accommodating variable-order Brownian motion. Additionally, it mitigates the computational challenges typically associated with modeling such processes. The innovative approach employs a newly developed and straightforward matrix-based algorithm grounded in B-spline functions, offering an efficient, accurate, and computationally simple technique for approximating variable-order fractional Brownian motion. Also, this study focuses on solving a novel class of integral equations driven by variable-order fractional Brownian motion. The proposed method uses the features of barycentric rational interpolants and the spectral method to provide a simple and accurate approach, thereby reducing the complexities associated with solving such integral equations. The convergence of the method is analyzed in detail, and its theoretical robustness is emphasized. Furthermore, several numerical experiments have been conducted, demonstrating the reliability and adaptability of the method in challenging stochastic models. All numerical results have been analyzed using statistical methods to ensure greater reliability and accuracy.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108199"},"PeriodicalIF":4.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating epidemic model of infectious disease for stability analysis and approximation solution","authors":"Israr Ahmad ,&nbsp;Zeeshan Ali ,&nbsp;Mohammadi Begum Jeelani ,&nbsp;Ghaliah alhamzi ,&nbsp;Tariq Aziz","doi":"10.1016/j.rinp.2025.108202","DOIUrl":"10.1016/j.rinp.2025.108202","url":null,"abstract":"<div><div>In the current work, we formulate a fractional order model via the use of fractional Mittag-Leffler derivative (FMD) to describe the dynamics of Chikungunya virus. We investigate existence, uniqueness, positivity and boundedness of the concerned model. We identify threshold conditions for the endogenous persistence vs eradication of the virus, and predict the potential for outbreaks by computing reproduction numbers <span><math><mrow><mo>(</mo><msub><mrow><mi>R</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo></mrow></math></span>. Besides this, we also study the stability by determining the condition on which disease-free equilibrium stays stable. A comparative study and sensitivity analysis are also given in detail in the work. We conduct numerical simulations using a two-step Lagrange polynomial method that can efficiently investigate the dynamics of the specified model. Our findings highlight the role of fractional calculus (FC) in epidemiological models, which incorporate memory effects and genetic trait, and can lead to more accurate forecasts as well as efficacious public health policy. These findings not only support the theoretical foundation of infectious disease modeling, but also serve as a launching point for future research on other vector-borne diseases. We offer predictions of the model for different fractional orders, demonstrating how alterations in these orders affect the model predictions.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108202"},"PeriodicalIF":4.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cooling mechanical resonator to ground state in P T-symmetric cavity optomechanical system via pump modulation","authors":"Rui Chang,&nbsp;Suying Zhang","doi":"10.1016/j.rinp.2025.108184","DOIUrl":"10.1016/j.rinp.2025.108184","url":null,"abstract":"<div><div>We propose a scheme to cool a mechanical resonator to its ground state in a <span><math><mrow><mi>P</mi><mi>T</mi></mrow></math></span>-symmetric cavity optomechanical system. The system features a loss optomechanical cavity coupled to a gain cavity, with the loss cavity being driven by an amplitude-modulated laser field. Utilizing numerical simulation methods, we study the stability of the system and the cooling properties of the mechanical resonator in detail. We find that the system is almost stable within the unbroken <span><math><mrow><mi>P</mi><mi>T</mi></mrow></math></span>-symmetry region. The mechanical resonator achieves ground state cooling in both resolved-sideband and unresolved-sideband regimes. Notably, the cooling efficiency is significantly higher in the unbroken <span><math><mrow><mi>P</mi><mi>T</mi></mrow></math></span>-symmetry region compared to its broken counterpart. <span><math><mrow><mi>P</mi><mi>T</mi></mrow></math></span>-symmetry plays a pivotal role in optimizing the cooling performance of the mechanical resonator. These findings open new avenues for quantum manipulation using <span><math><mrow><mi>P</mi><mi>T</mi></mrow></math></span>-symmetric systems, with potential applications in macroscopic optical devices.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108184"},"PeriodicalIF":4.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced multiwavelength random fiber laser based on hybrid optical amplifier incorporating Sagnac loop mirror interferometer","authors":"Hanun Enani Muhamad Aliza ,&nbsp;Abdul Hadi Sulaiman ,&nbsp;Aiman Ismail ,&nbsp;Fairuz Abdullah ,&nbsp;Nelidya Md Yusoff ,&nbsp;Siti Azlida Ibrahim ,&nbsp;Md Zaini Jamaludin","doi":"10.1016/j.rinp.2025.108212","DOIUrl":"10.1016/j.rinp.2025.108212","url":null,"abstract":"<div><div>This work presents an enhanced multiwavelength random fiber laser employing a hybrid optical amplifier in combination with high nonlinearity devices, achieved through the integration of a polarizer with highly nonlinear fiber (HNLF). A Sagnac loop mirror interferometer serves as the comb filtering device, while the hybrid optical amplifier comprises an erbium-doped fiber amplifier (EDFA) and a semiconductor optical amplifier (SOA) as gain media. The SOA’s role in the laser cavity is to mitigate mode competition caused by the homogeneous broadening of the EDFA. The multiwavelength performance is enhanced by introducing nonlinear polarization rotation effect through the interaction of the HNLF, SOA, and polarizer (Condition A). The optimal lasing spectrum features 52 lasing lines within a 3 dB uniformity range and a high extinction ratio (ER) of 20 dB. The multiwavelength bandwidth is 9.5 nm, which is broader compared to previous studies on MWRFLs utilizing a linear cavity configuration. Removing the polarizer (Condition B) reduces the number of lasing lines to 51 and the ER to 19 dB. Furthermore, excluding the HNLF (Condition C) from the linear cavity decreases the spectral flatness and lowers the number of lasing lines to 32. A decrease in EDFA power results in fewer lasing lines, and variations in the angle of polarization controller has changed the ER value. Laser stability was evaluated over 2 hours, showing a peak power fluctuation of approximately 4 dB.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108212"},"PeriodicalIF":4.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regulation of helium atom higher harmonic emission and attosecond pulse angle in inhomogeneous fields","authors":"Nan Xu ,&nbsp;Shu-Shan Zhou ,&nbsp;Yuan Wang","doi":"10.1016/j.rinp.2025.108190","DOIUrl":"10.1016/j.rinp.2025.108190","url":null,"abstract":"<div><div>With the rapid advancements in modern science, the interaction between laser fields and matter has become a focal point of research in various disciplines. In this study, we investigate high-order harmonic generation (HHG) modulated by spatially inhomogeneous laser fields, using helium atoms as a model system. Two types of nanostructures – single gold-tip and double gold-tip configurations – are employed to generate spatially non-uniform laser fields that interact with the helium atoms. Our results reveal that the angular orientation of attosecond pulses is significantly influenced by the inhomogeneous parameters of the laser field. For a single gold-tip nanostructure, when the inhomogeneous parameter along the x-axis is fixed at 0.002 and the parameter along the y-axis is varied from 0.002 to 0.006, the angle between the attosecond pulse and the x-axis shifts from 129°to 139°. In the case of a double gold-tip nanostructure, with the same variation in the y-direction parameter and the x-direction parameter held constant at 0.002, the attosecond pulse angle decreases from 115°to 102°. Different from previous studies, this paper combines two nanostructures and focuses on how the angle of attosecond pulse is affected by heterogeneous parameters, revealing new properties of attosecond pulse dynamics. These findings demonstrate the critical role of spatial field inhomogeneity in tailoring attosecond pulse dynamics.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108190"},"PeriodicalIF":4.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive study of physical properties of TMP2 (TM = Fe, Ru, Os): As semiconductors for optoelectronic and thermoelectronic applications","authors":"A. Almeshal ,&nbsp;M. Musa Saad H.-E. ,&nbsp;B.O. Alsobhi","doi":"10.1016/j.rinp.2025.108211","DOIUrl":"10.1016/j.rinp.2025.108211","url":null,"abstract":"<div><div>Herein, we have performed a comprehensive study on the electronic, structural, optical, and thermoelectric characteristics of TMP₂ (TM = Fe, Ru, Os). The optimized parameters reveal that TMP₂ crystallize in an orthorhombic (Pnnm; #58). Both DOSs and BSs within PBE, mBJ and SOC depict that TMP₂ possess semiconductor nature with a narrow bandgap (<span><math><msub><mi>E</mi><mi>g</mi></msub></math></span> = 0.414, 0.553 and 0.775 eV), respectively. The calculated DOS confirm that the Fe-3d, Ru-4d, and Os-5d orbitals have the dominant contribution at the top of valence bands. In addition, TMP₂ show unique optical characteristics such as strong absorption, high conductivity, and fit refractivity in the visible region. Finally, the thermoelectric characteristics, Seebeck power, figure of merit, power factor, electrical and thermal conductivities, and heat capacity are described at different <span><math><mi>T</mi></math></span>. Notably, the obtained characteristics and (<span><math><mrow><mi>ZT</mi></mrow></math></span> = 1.0; 60–300 K) highlight the huge potential of semiconductors TMP₂ and their perfect suitability for various optoelectronic and thermoelectronic applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108211"},"PeriodicalIF":4.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-level DLD microfluidic chip for plasma separation: A novel approach using Cu-ACE","authors":"Milad Darboui ,&nbsp;Meysam Fatehi ,&nbsp;Reza Zareifar ,&nbsp;Hamid Reza Taheri Tolgari ,&nbsp;Hadi Esmaeili Khoshmardan","doi":"10.1016/j.rinp.2025.108209","DOIUrl":"10.1016/j.rinp.2025.108209","url":null,"abstract":"<div><div>This paper presents the design and fabrication of an innovative microfluidic chip inspired by the intricate mechanism of fish gills. The main objective of this study is to develop an efficient microfluidic chip for the selective separation of blood plasma. To this end, numerical simulations in COMSOL Multiphysics software have been employed to optimize geometric and operational parameters, thereby achieving optimal separation efficiency. The fabrication of this chip employed the copper-assisted chemical etching (Cu-ACE) technique, resulting in the formation of a well-ordered array of crescent-shaped micro holes on a silicon wafer. The micro holes were molded using polydimethylsiloxane (PDMS), resulting in the production of PDMS pillars in a deterministic lateral displacement (DLD) structure. These filters were integrated into a copper reservoir with a depth of 10 μm, then strong bond between the PDMS structure and copper substrate was established using a new self-assembled silane layer. To assess the surface morphology and quality of the fabricated structures, field emission scanning electron microscopy (FE-SEM) and optical microscopy (OM) were utilized to observe the separation of the cells from the plasma. A hemocytometer was provided to determine the purity percentage for validation and assessment of the results. The results indicated that the adhesion between PDMS and copper is acceptable. Additionally, the crescent-shaped pillars have an efficient effect on the separation, achieving a plasma purity of 98 % from experimental test.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"71 ","pages":"Article 108209"},"PeriodicalIF":4.4,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Learning-based super-resolution for remote sensing images via adaptive reconstruction regularization","authors":"Ruolin Ruan ,&nbsp;Fanghua Liu ,&nbsp;Hao Ni","doi":"10.1016/j.rinp.2025.108206","DOIUrl":"10.1016/j.rinp.2025.108206","url":null,"abstract":"<div><div>Dictionary learning has made a great breakthrough in single image super-resolution (SR) for remote sensing images. Most of these learning-based methods adopt the empirical training regularized parameter and reconstruction regularized parameter for all input images. This ignores the feature differences among the input low-resolution (LR) images and finally limits the SR performance. To address this problem, we propose an adaptive reconstruction regularization (ARR) algorithm. The reconstruction regularized parameter is adaptively solved by the U-curve algorithm corresponding to each LR remote sensing image, leading to the optimal reconstruction sparse coefficients. To enhance the edges and corners, the high-frequency patches are separately reconstructed after feature extraction. The final SR image is obtained by the superposition of the high-frequency part and the Bicubic up-scaling part. According to the experimental results, our proposed ARR can obtain sharper edges and crispier textures in the recovered SR images than several state-of-the-art methods, demonstrating superior SR performances.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"71 ","pages":"Article 108206"},"PeriodicalIF":4.4,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and characterization of Zn doped CoFe2O4 magnetic nanoparticles and their antimicrobial and wound healing assay","authors":"S. Dhivya Bharathi,&nbsp;D. Rajan Babu","doi":"10.1016/j.rinp.2025.108210","DOIUrl":"10.1016/j.rinp.2025.108210","url":null,"abstract":"<div><div>In this study, we evaluated the antimicrobial and wound healing assay of CoFe₂O₄(COF) and Zn_0.2Co_0.8Fe₂O₄ (ZCOF) nanoparticles formed via sol–gel auto combustion method. The physicochemical characteristics of prepared materials were analyzed using XRD, FTIR, XPS, FESEM, EDS, BET, and VSM. The ZCOF shows enhanced responses for all biological studies compared to COF because of the high surface area of 9.06 m²/g for ZCOF and 5.94 m²/g for COF. The magnetic saturation is found to be 87.51 emu/g for ZCOF, 70.76 emu/g for COF, and the coercivity of 466.12 Oe for ZCOF, 580.08 Oe for COF. These results confirm the synthesized nanoparticles will benefit from the presented vision with varied doping elements for enhanced biological activity.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108210"},"PeriodicalIF":4.4,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}