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Adaptive geometric joint prior image deblurring model based on multi-regularization
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-21 DOI: 10.1016/j.physleta.2025.130388
Jiayin Yu , Lulu Zhang , Yang Wang, Caiying Wu
{"title":"Adaptive geometric joint prior image deblurring model based on multi-regularization","authors":"Jiayin Yu ,&nbsp;Lulu Zhang ,&nbsp;Yang Wang,&nbsp;Caiying Wu","doi":"10.1016/j.physleta.2025.130388","DOIUrl":"10.1016/j.physleta.2025.130388","url":null,"abstract":"<div><div>Curvature regularization has become a fundamental tool in image processing due to its strong priors for edge preservation. In this paper, we introduce a novel multi-regularization framework that incorporates Gaussian curvature, mean curvature and surface area, enabling adaptive selection of geometric priors in different regions based on their specific characteristics. To efficiently optimize this term, we utilize a curvature filter that implicitly enforces curvature constraints without the need for explicit calculations, significantly enhancing computational efficiency. Additionally, we incorporate gradient <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span> norm constraint, which not only preserve image edges more effectively but also can promote the sparseness of the model. Our approach is further supported by an ADMM-based optimization algorithm tailored to solve the model. Extensive comparison experiments demonstrate the effectiveness, robustness, and superiority of the proposed regularization framework for image deblurring tasks.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130388"},"PeriodicalIF":2.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Exact solutions and conservation laws of the generalized Schrödinger–Hirota equation
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-21 DOI: 10.1016/j.physleta.2025.130373
Nikolay A. Kudryashov , Chao-Qing Dai , Qin Zhou , Aleksandr A. Kutukov
{"title":"Exact solutions and conservation laws of the generalized Schrödinger–Hirota equation","authors":"Nikolay A. Kudryashov ,&nbsp;Chao-Qing Dai ,&nbsp;Qin Zhou ,&nbsp;Aleksandr A. Kutukov","doi":"10.1016/j.physleta.2025.130373","DOIUrl":"10.1016/j.physleta.2025.130373","url":null,"abstract":"<div><div>In this paper, we consider a nonlinear nonintegrable partial differential equation of the third order, which is a generalization of the Schrödinger–Hirota equation. This equation allows modeling the propagation of optical pulses in a nonlinear medium. We obtained three conservation laws for the equation by direct transformations. For the traveling wave reduction of the generalized Schrödinger–Hirota equation, we found first integrals from the conservation laws. We applied the implicit function method and the simplest equations method to construct optical solitons and exact solutions in the form of periodic waves.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130373"},"PeriodicalIF":2.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Excitation of a surface electromagnetic wave by a traveling Josephson vortex
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-21 DOI: 10.1016/j.physleta.2025.130389
A.S. Malishevskii, S.A. Uryupin
{"title":"Excitation of a surface electromagnetic wave by a traveling Josephson vortex","authors":"A.S. Malishevskii,&nbsp;S.A. Uryupin","doi":"10.1016/j.physleta.2025.130389","DOIUrl":"10.1016/j.physleta.2025.130389","url":null,"abstract":"<div><div>A system of coupled equations for the phase difference of the superconducting order parameter and the magnetic field of the surface wave is formulated for a Josephson sandwich embedded in a dielectric. In the weak coupling limit, the excitation of terahertz range surface wave by a Josephson vortex traveling with constant velocity is described. The magnetic field of the wave and the energy flux carried by the wave are found.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"540 ","pages":"Article 130389"},"PeriodicalIF":2.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Investigating broadly dispersive solitons in optical couplers for metamaterials with nonlinear cubic-quintic-septic dynamics and white noise using distinct integration approaches
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-20 DOI: 10.1016/j.physleta.2025.130367
Elsayed M.E. Zayed , Mona El-Shater , Muhammad Amin S. Murad , Aydin Secer , Muslum Ozisik , Ahmed H. Arnous
{"title":"Investigating broadly dispersive solitons in optical couplers for metamaterials with nonlinear cubic-quintic-septic dynamics and white noise using distinct integration approaches","authors":"Elsayed M.E. Zayed ,&nbsp;Mona El-Shater ,&nbsp;Muhammad Amin S. Murad ,&nbsp;Aydin Secer ,&nbsp;Muslum Ozisik ,&nbsp;Ahmed H. Arnous","doi":"10.1016/j.physleta.2025.130367","DOIUrl":"10.1016/j.physleta.2025.130367","url":null,"abstract":"<div><div>This study delves into the complex dynamics of stochastic coupled systems within an optical coupler designed explicitly for metamaterials operating under a cubic-quintic-septic nonlinearity. This system is characterized by its spatiotemporal dispersion and is subjected to the randomness introduced by multiplicative white noise. The primary objective of our investigation is to unravel the intricate behaviour of this system, which is crucial for advancing our understanding of nonlinear optical phenomena and for the development of innovative engineering solutions in the field of photonics. To achieve this, we employ three distinct analytical techniques: The unified Riccati expansion method, a refined version of Kudryashov's method, and a novel enhanced direct algebraic approach. An in-depth analysis of the impact of white noise on the soliton structures reveals significant fluctuations, offering new insights into the stability and dynamics of solitons in noisy environments.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130367"},"PeriodicalIF":2.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Nonlinear optical enhancement effect of nickel-coated multi-walled carbon nanotubes
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-20 DOI: 10.1016/j.physleta.2025.130365
Xiaofan Chen , Yuan Xue , Yang Yang , Songtao Li , Siwen Zhang , Yanfeng Wang , Wei Dang , Feng Wu
{"title":"Nonlinear optical enhancement effect of nickel-coated multi-walled carbon nanotubes","authors":"Xiaofan Chen ,&nbsp;Yuan Xue ,&nbsp;Yang Yang ,&nbsp;Songtao Li ,&nbsp;Siwen Zhang ,&nbsp;Yanfeng Wang ,&nbsp;Wei Dang ,&nbsp;Feng Wu","doi":"10.1016/j.physleta.2025.130365","DOIUrl":"10.1016/j.physleta.2025.130365","url":null,"abstract":"<div><div>In this letter, the nonlinear optical properties of nickel-coated multi-walled carbon nanotubes and multi-walled carbon nanotubes (MWCNTs) were investigated by Z-scan technique. The nonlinear absorption (NLA) of nickel-coated MWCNTs are significantly enhanced in comparison with that of MWCNTs under the excitation of 532 nm and 1064 nm laser pulse. After coating the nickel films on MWCNTs, the nonlinear refraction of the samples change from the initial self-defocusing to the self-focusing effect under the excitation of 1064 nm laser pulse. The sign of the nonlinear refractive indices remain unchanged at 532 nm. The excellent nonlinear performance of nickel-coated MWCNTs leads to a potential application in the photonic field.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"540 ","pages":"Article 130365"},"PeriodicalIF":2.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Response of the quantum ground state to a parametric drive
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-19 DOI: 10.1016/j.physleta.2025.130369
Ranjani Seshadri
{"title":"Response of the quantum ground state to a parametric drive","authors":"Ranjani Seshadri","doi":"10.1016/j.physleta.2025.130369","DOIUrl":"10.1016/j.physleta.2025.130369","url":null,"abstract":"<div><div>The phenomenon of Parametric Resonance (PR) is very well studied in classical systems with one of the textbook examples being the stabilization of a Kapitza's pendulum in the inverted configuration when the suspension point is oscillated vertically. One important aspect that distinguishes between classical PR and ordinary resonance is that in the former, if the initial energy of the system is at its minimum (<span><math><mover><mrow><mi>x</mi></mrow><mrow><mo>˙</mo></mrow></mover><mo>=</mo><mi>x</mi><mo>=</mo><mn>0</mn></math></span>), the system does not evolve. In a quantum system, however, even when the system is in the minimum energy (ground) state, the system has non-trivial evolution under PR due to the delocalized nature of the ground-state wavefunction. Here we study the evolution of such a system which exhibits a purely quantum effect with no classical analog. In particular, we focus on the quantum mechanical analog of PR by varying with time the parabolic potential i.e. the frequency of the quantum harmonic oscillator.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130369"},"PeriodicalIF":2.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Ultra-sensitive hemoglobin sensing empowered by momentum-mismatch-driven quasi-bound states in the continuum
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-19 DOI: 10.1016/j.physleta.2025.130370
Shuaiqi Huang, Canxin Zhan, Yunyi Shan, Yingxian Li, Wenchuang Chen, Huiqing Dai, Keyin Cai, Jun Chen, Weilin Cai, Yuqing Su, Gengyan Chen, Feng Wu
{"title":"Ultra-sensitive hemoglobin sensing empowered by momentum-mismatch-driven quasi-bound states in the continuum","authors":"Shuaiqi Huang,&nbsp;Canxin Zhan,&nbsp;Yunyi Shan,&nbsp;Yingxian Li,&nbsp;Wenchuang Chen,&nbsp;Huiqing Dai,&nbsp;Keyin Cai,&nbsp;Jun Chen,&nbsp;Weilin Cai,&nbsp;Yuqing Su,&nbsp;Gengyan Chen,&nbsp;Feng Wu","doi":"10.1016/j.physleta.2025.130370","DOIUrl":"10.1016/j.physleta.2025.130370","url":null,"abstract":"<div><div>As one of the most vital proteins in blood, hemoglobin plays an important role in the diagnosis and treatment of diverse diseases, such as anemia and leukemia. In this paper, we leverage a momentum-mismatch-driven quasi-bound state in the continuum (quasi-BIC) in a resonant grating waveguide structure to achieve ultra-sensitive hemoglobin sensing. Empowered by the extraordinary resonant feature of the momentum-mismatch-driven quasi-BIC, the optimized resolution for hemoglobin sensing reaches the order of 10<sup>−3</sup> g/L. Besides, the maximum <em>Q</em> factor and figure of merit reach the order of 10<sup>3</sup> and 10<sup>−1</sup> L/g, respectively. Our work provides a practicable route, well within current experimental conditions, to achieving ultra-sensitive hemoglobin sensing. These results would possess applications in the diagnosis and treatment of hemoglobin-related diseases.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130370"},"PeriodicalIF":2.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Reinforcement learning enhancing entanglement for two-photon-driven Rabi model
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-19 DOI: 10.1016/j.physleta.2025.130368
Tingting Li , Yiming Zhao , Yong Wang, Yanping Liu, Yazhuang Miao, Xiaolong Zhao
{"title":"Reinforcement learning enhancing entanglement for two-photon-driven Rabi model","authors":"Tingting Li ,&nbsp;Yiming Zhao ,&nbsp;Yong Wang,&nbsp;Yanping Liu,&nbsp;Yazhuang Miao,&nbsp;Xiaolong Zhao","doi":"10.1016/j.physleta.2025.130368","DOIUrl":"10.1016/j.physleta.2025.130368","url":null,"abstract":"<div><div>A control scheme is proposed that leverages reinforcement learning to enhance entanglement by modulating the two-photon-driven amplitude in a Rabi model. The quantum phase diagram versus the two-photon-driven amplitude and the coupling between the cavity field and the atom in the Rabi model is indicated by the energy spectrum of the hybrid system, the witness of entanglement, second order correlation, and negativity of Wigner function. From a dynamical perspective, the behavior of entanglement can reflect the phase transition and the reinforcement learning agent is employed to produce temporal sequences of control pulses to enhance the entanglement in the presence of dissipation. The entanglement can be enhanced in different parameter regimes and the control scheme exhibits robustness against dissipation. The replaceability of the controlled system and the reinforcement learning module demonstrates the generalization of this scheme. This research paves the way of positively enhancing quantum resources in non-equilibrium systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130368"},"PeriodicalIF":2.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Features of alkali D2 line magnetically-induced transitions excited under π-polarized laser radiation
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-19 DOI: 10.1016/j.physleta.2025.130372
Armen Sargsyan , Emmanuel Klinger , Arevik Amiryan , David Sarkisyan
{"title":"Features of alkali D2 line magnetically-induced transitions excited under π-polarized laser radiation","authors":"Armen Sargsyan ,&nbsp;Emmanuel Klinger ,&nbsp;Arevik Amiryan ,&nbsp;David Sarkisyan","doi":"10.1016/j.physleta.2025.130372","DOIUrl":"10.1016/j.physleta.2025.130372","url":null,"abstract":"<div><div>The impact of the optical field polarization on the spectrum of magnetically-induced transitions, a class of transitions forbidden at zero magnetic field, is studied with a weak-probe sub-Doppler technique. The high spectral resolution of the technique combined with the simplicity in interpreting the observed spectra allows to follow the behavior of individual transitions as a function of the magnetic field amplitude. We observe only one intense transition (out of <span><math><mn>2</mn><msub><mrow><mi>F</mi></mrow><mrow><mi>g</mi></mrow></msub><mo>+</mo><mn>1</mn></math></span>, where <em>F</em> is the quantum number associated with the total angular momentum of the atom) in the case of <em>π</em>-polarized laser radiation (a configuration where the applied magnetic field is parallel to the electric field from the laser radiation) in the <span><math><msub><mrow><mi>F</mi></mrow><mrow><mi>g</mi></mrow></msub><mo>→</mo><msub><mrow><mi>F</mi></mrow><mrow><mi>g</mi></mrow></msub><mo>+</mo><mn>2</mn></math></span> manifolds of <sup>85</sup>Rb, <sup>87</sup>Rb and <sup>133</sup>Cs for fields above a few hundreds of gauss. We show that this behavior is in agreement with a model based on the diagonalization of the Zeeman Hamiltonian matrix. With the rapid development of micro-machined vapor-cell-based sensors, these results will be of use to magnetometers operating above Earth field, wide-range laser frequency stabilization systems and atomic Faraday filters.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130372"},"PeriodicalIF":2.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
引用次数: 0
Numerical study on cavitation bubble dynamics with dual-frequency excitation in magnesium alloy melt
IF 2.3 3区 物理与天体物理
Physics Letters A Pub Date : 2025-02-18 DOI: 10.1016/j.physleta.2025.130366
Qichi Le , Zhaoyang Yin , JunChao Wu , Shutang Gao , Wenlai Li , Qiyu Liao
{"title":"Numerical study on cavitation bubble dynamics with dual-frequency excitation in magnesium alloy melt","authors":"Qichi Le ,&nbsp;Zhaoyang Yin ,&nbsp;JunChao Wu ,&nbsp;Shutang Gao ,&nbsp;Wenlai Li ,&nbsp;Qiyu Liao","doi":"10.1016/j.physleta.2025.130366","DOIUrl":"10.1016/j.physleta.2025.130366","url":null,"abstract":"<div><div>The enhancement and control of acoustic cavitation in liquids by dual-frequency excitation have been verified. However, the effect of the acoustic parameters of the dual sources on the cavitation bubble dynamics is not clear and further studies are needed. In this work, a dual-frequency driven bubble dynamics model is developed based on the Keller-Miksis equation. The effects of equilibrium radius, driving frequency, and acoustic pressure on the dynamic evolution of a single bubble are investigated. The results indicate that the cavitation bubble collapse strength is high and sensitive to frequency variation in the low-low or low-high frequency domain. At low-low frequency coupling, dual-frequency ultrasound enhances cavitation. At low-high frequency coupling, dual-frequency ultrasound weakens the acoustic cavitation. With both driving frequencies larger than 100 kHz, the collapse strength reduces to a stable low level and no longer responds significantly to frequency variation. Increasing the acoustic pressure enhances the synergistic effect between the two distinct frequencies. The collapse strength for two equal frequencies is independent of the pressure ratio. For two distinct frequencies, increasing the pressure ratio of a lower frequency increases the collapse strength significantly. Higher collapse strength is often obtained at the cost of longer collapse time.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"539 ","pages":"Article 130366"},"PeriodicalIF":2.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
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