物理最新文献

{"title":"Machine learning-guided study of residual stress, distortion, and peak temperature in stainless steel laser welding","authors":"Yapeng Yang,&nbsp;Nagaraj Patil,&nbsp;Shavan Askar,&nbsp;Abhinav Kumar","doi":"10.1007/s00339-024-08145-8","DOIUrl":"10.1007/s00339-024-08145-8","url":null,"abstract":"<div><p>This paper presents a machine learning (ML) approach using Kernel Ridge Regression (KRR) to predict peak temperature, residual stress, and distortion in stainless steels during oscillating laser welding. The model was trained using reliable data from numerical simulations, which incorporated both welding parameters and material properties of stainless steels. The KRR model’s regression analysis demonstrated high accuracy with R² values of 0.968, 0.951, and 0.928, and RMSE values of 3.35%, 4.51%, and 5.78% for peak temperature, maximum residual stress, and distortion degree, respectively. However, slight prediction deviations were observed, particularly at higher distortion levels. The study also highlighted the critical role of input feature weight functions in optimizing predictions. Peak temperature was predominantly influenced by physical material properties, while residual stress and distortion were governed by both mechanical and physical factors. Moreover, at lower peak temperatures, predictions were more sensitive to laser oscillation frequency, amplitude, and welding speed, whereas higher temperatures were more affected by preheating and sample thickness. Additionally, increased residual stress and distortion levels were strongly linked to the weight functions of laser oscillation frequency and amplitude.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Screening length of a heavy quark–antiquark pair in non-commutative plasma","authors":"Ping-ping Wu,&nbsp;Xiangrong Zhu,&nbsp;Zi-qiang Zhang","doi":"10.1140/epjc/s10052-024-13646-0","DOIUrl":"10.1140/epjc/s10052-024-13646-0","url":null,"abstract":"<div><p>We investigate the screening length of a heavy quark–antiquark (<span>(Q{bar{Q}})</span>) pair in non-commutative <span>({mathcal {N}}=4)</span> super Yang–Mills plasma at strong coupling. We perform the analysis by computing the Wilson loop in a boosted background and consider the axis of the <span>(Q{bar{Q}})</span> pair along different directions. It turns out that the inclusion of non-commutativity increases the screening length, thus enhancing the binding energy of the <span>(Q{bar{Q}})</span> pair. Furthermore, the presence of non-commutativity reduces quarkonium dissociation, in agreement with previous findings of the imaginary potential and entropic force.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13646-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844742","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":"Thermalization and non-monotonic entanglement growth in an exactly solvable model","authors":"Shruti Paranjape,&nbsp;Nilakash Sorokhaibam","doi":"10.1140/epjc/s10052-024-13678-6","DOIUrl":"10.1140/epjc/s10052-024-13678-6","url":null,"abstract":"<div><p>We study quantum quenches and subsequent non-equilibrium dynamics of free Dirac fermions in 1 + 1 spacetime dimensions using time dependent mass. The final state is a normalized boundary state which is called generalized Calabrese-Cardy (gCC) state and the system thermalizes to a generalized Gibb’s Ensemble(GGE). We can also tune the initial states so that the final states are exact Calabrese-Cardy (CC) state and special gCC states. The system in the CC state thermalizes to a Gibb’s ensemble. We derive closed-form analytic expressions for the growth of entanglement entropy of subsystems consisting of arbitrary number of disjoint intervals in CC state. We show that the entanglement entropy of a single interval grows monotonically before saturation. In case of certain gCC states, for particular charges, the entanglement entropy of a single interval grows non-monotonically when the effective chemical potential is increased beyond a critical value. We argue that the non-monotonic growth of entanglement entropy is a boundary effect which arises due to increase in long range correlation and decrease in short range correlation at early times.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"84 12","pages":""},"PeriodicalIF":4.2,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13678-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844744","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":"Elastic proton transfer in the scattering of 15N + 16O near the Coulomb barrier","authors":"B. Mauyey,&nbsp;N. Burtebayev,&nbsp;N. Amangeldi,&nbsp;G. Yergaliuly,&nbsp;D. Soldatkhan,&nbsp;Zh. Kurmanaliyev,&nbsp;Ye. Raiymbekov,&nbsp;R. Akhat,&nbsp;K. Asemkhan,&nbsp;D. Janseitov,&nbsp;Awad A. Ibraheem,&nbsp;K. W. Kemper,&nbsp;Sh. Hamada","doi":"10.1140/epja/s10050-024-01457-6","DOIUrl":"10.1140/epja/s10050-024-01457-6","url":null,"abstract":"<div><p>The present work presents a detailed analysis of angular distribution data for the ¹⁵N + ¹⁶O system in the energy range <i>E</i>_c.m. = 10.3–20.6 MeV that are characterized by pronounced increases in cross sections at large angles &gt; 130°. These data sets allow for the energy dependence of elastic scattering potentials and elastic proton transfer to be explored from energies just below the Coulomb barrier to energies about 1.5 times its value. For this purpose, we have implemented various forms, both phenomenological and microscopic, for the interaction potentials. An elastic proton transfer amplitude for the ¹⁶O → <i>p</i> + ¹⁵N configuration was added to the scattering analysis through DWBA calculations. The extracted amplitudes were roughly energy and optical model form independent and yielded a good description of the enhanced large angle cross sections. These amplitudes when then converted to ¹⁶O → <i>p</i> + ¹⁵N spectroscopic factors (<i>SF</i>), are in good agreement with previously reported light ion reaction ones. Possible channel coupling effects on the large angle cross sections that included excitation of ¹⁶O and transfer to excited ¹⁵N states were carried out through Coupled Reaction Channels (CRC) calculations and found to be small.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 12","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859830","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}

{"title":"New agegraphic dark energy model in modified symmetric teleparallel theory","authors":"Madiha Ajmal,&nbsp;Muhammad Sharif","doi":"10.1140/epjp/s13360-024-05805-9","DOIUrl":"10.1140/epjp/s13360-024-05805-9","url":null,"abstract":"<div><p>In this manuscript, we examine the cosmological significance of the new agegraphic dark energy model by investigating different cosmological parameters such as the equation of state parameter, <span>(omega _{D}-omega ^{prime }_{D})</span> and the <span>(r-s)</span> planes in the framework of <span>(f(mathcal {Q}))</span> theory. We consider flat Friedmann-Robertson-Walker universe model under interacting conditions between dark energy and dark matter. The equation of state parameter indicates a quintessence-like characteristic of the universe. The stability of the model is analyzed using the squared speed of sound parameter which demonstrates the unstable behavior of the new agegraphic dark energy model throughout the cosmic evolution. The freezing region is represented by the <span>(omega _{D}-omega ^{prime }_{D})</span> plane, while the Chaplygin gas model corresponds to the <span>(r-s)</span> plane. It is worthwhile to mention here that the interacting new agegraphic dark energy model addresses the cosmic coincidence problem by allowing the energy density ratio between dark energy and dark matter to evolve slowly over cosmic time.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"139 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859437","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}

{"title":"Dielectric, optical properties, γ-ray/neutron shielding capacity of bismo-borate glasses reinforced with CeO2","authors":"Norah A. M. Alsaif,&nbsp;Adel M. El-Refaey,&nbsp;R. A. Elsad,&nbsp;M. S. Shams,&nbsp;W. M. Almutairi,&nbsp;Y. S. Rammah","doi":"10.1007/s00339-024-08165-4","DOIUrl":"10.1007/s00339-024-08165-4","url":null,"abstract":"<div><p>The produced glasses with the chemical formula 60B₂O₃–20Na₂O–15ZnO–5Bi₂O₃–XCeO₂, with X = 0.0 (Ce-0.0)—0.9 (Ce-0.9) mol% glasses have been studied in terms of their physical, optical, and dielectric properties. Densities (ρ) ranged from 3.16 g/cm³ to 3.29 g/cm³. The absorbance spectra revealed that the broad near-visible band for the Ce-0.0 sample had a central wavelength of λ_cutoff = 430.03 nm, but for the Ce-0.9 glass sample, it shifted towards a higher wavelength of λ_cutoff = 548.63 nm. The direct optical band gap (<span>({E}_{g}^{Direct})</span>) decreased From 3.10 eV to 2.52 eV and the indirect optical gap (<span>({E}_{g}^{Indirect}))</span> declined from 2.95 eV to 2.22 eV. Urbach’s energy (E_U) values decreased from 0.273 eV to 0.211 eV as the CeO₂ content in the glass network increased, although refractive index (n) values increased from 2.39 to 2.60. With an increase in CeO₂ content, the Ce-X glasses’ molar polarizability (α_m) and molar refraction (R_m) were improved. The generated glasses’ dielectric spectroscopy is examined at room temperature at frequencies ranging from 50 Hz to 5 MHz in order to assess the chemical modifications caused by cerium doping on dielectric spectroscopy elements such the dielectric constant (ɛ^′) and tangent loss (tan δ). The ε^′ of all the glasses loaded with various concentrations of cerium decreases significantly as the frequency rises during the low frequency interval. The energy absorption (EABF) and exposure (EBF) accumulation factors had their lowest values at 1 MFPs and their highest values at 40 MFPs. The samples with Ce-0.9 possessed the lowest values of relaxation length (λ_FRNCS) and half value layer (HVL_FRNCS). The suggested glasses can be used in various optoelectronics and electrical devices.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Forty years of composite polymer electrolytes – a subjective view","authors":"Janusz Płocharski","doi":"10.1007/s00339-024-08119-w","DOIUrl":"10.1007/s00339-024-08119-w","url":null,"abstract":"<div><p>Solid polymer electrolytes (SPEs) with various fillers improving their properties are studied for about forty years. The continuous research is fostered by the vision of all solid-state lithium batteries (ASSLBs) regarded by the energy-storage community as one of the most important goals. This comprehensive review summarizes these efforts from a position of a person who witnessed the development of Composite Polymer Electrolytes (CPEs) from the very beginning.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00339-024-08119-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of dye-sensitized upconversion nanoparticles for application to an ultrasensitive ratiometric probe for R6G","authors":"Jingyu Shang,&nbsp;Zhenhua Li,&nbsp;Tianpeng Yan,&nbsp;Xueru Zhang,&nbsp;Yuxiao Wang","doi":"10.1007/s00339-024-08164-5","DOIUrl":"10.1007/s00339-024-08164-5","url":null,"abstract":"<div><p>As a frequently utilized fluorescent dye, R6G assumes a crucial role in biomedical imaging, environmental monitoring, and chemical sensing due to its distinctive optical characteristics. Nevertheless, its application has also brought along corresponding environmental issues, rendering the trace detection of R6G dye particularly significant. Herein, we present a novel and facile approach employing dye-sensitized lanthanide-doped nanocrystals that effectively addresses these limitations. The upconversion (UC) luminescence of these nanocrystals is significantly enhanced by two orders of magnitude under the sensitization of indocyanine green (ICG) dye molecules. Thus, we have established a solid foundation for a highly sensitive ratiometric fluorescence sensing system. Taking advantage of this property, we have developed a UC-based R6G dye trace probe with extremely high detection sensitivity, capable of resolving concentrations as low as 10^− 9 mol/L. We have comprehensively investigated the underlying mechanism of dye-sensitized UC luminescence, revealing key enhancements in the analytical performance of our probe. The substantial progress achieved in this study has far-reaching implications for applications in food safety, drug development, and environmental monitoring, and provides a promising direction for future research and technological innovation in the domain of trace detection of organic dyes.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unveiling geometric quantum resources and uncertainty relation in a two-dimensional electron gas","authors":"Chaimae Banouni,&nbsp;Zakaria Bouafia,&nbsp;Mostafa Mansour,&nbsp;Mohamed Ouchrif","doi":"10.1007/s00340-024-08368-w","DOIUrl":"10.1007/s00340-024-08368-w","url":null,"abstract":"<div><p>Understanding two-dimensional electron gas (2DEG) systems is crucial for a comprehensive grasp of their quantum potential. Due to the spins of electrons, 2DEG systems present a scalable and practical platform for housing qubits in quantum information processing. This paper investigates how the distance between delocalized electrons and electron density influences the dynamic behavior of the quantum-memory-assisted entropic uncertainty relation (<span>(mathcal {QMA-EUR})</span>) and non-classical correlations in 2DEG systems. Geometric quantum metrics, such as Bures distance entanglement (<span>(mathcal {B})</span>), measure the entanglement between the spins of two delocalized electrons, while trace distance discord (<span>(mathcal {TDD})</span>) assesses quantum correlations in 2DEG systems. The results indicate that electron density in 2DEGs is crucial for preserving quantum correlations and reducing <span>(mathcal {QMA-EUR})</span>. Moreover, the findings suggest that electron separations have a detrimental effect on entanglement and non-classical correlations in these systems. It is demonstrated that <span>(mathcal {QMA-EUR})</span> behaves inversely to quantum correlations of electron spins in 2DEGs. Additionally, by adjusting electron density thoughtfully, quantum correlations can be strengthened against electron separation, ultimately reducing <span>(mathcal {QMA-EUR})</span>. These insights open up fascinating prospects for harnessing 2DEG systems in quantum information processing.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844886","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}

{"title":"Diversity and manipulability of pump-probe absorption spectra for a degenerate two-level system","authors":"JiaYu Han,&nbsp;Yue Sun,&nbsp;YingJie Du","doi":"10.1007/s00340-024-08366-y","DOIUrl":"10.1007/s00340-024-08366-y","url":null,"abstract":"<div><p>We present a theoretical study of pump-probe spectra of a degenerate two-level system subject to a magnetic field, which is driven by three different polarized fields and probed by two different polarized fields. In this system, the optical effects of two-photon resonance, coherent hole burning (CHB), as well as electromagnetically induced absorption (EIA) are involved. Based on the match between the pump and probe fields, four sets of electromagnetically induced transparencies (EITs) and two sets of CHBs are included in the coherent system. The types of Mollow absorption and absorption spectra with four main peaks are obtained, in which the absorption peaks are modified by the dips of EITs and CHBs. In the weak coupled fields, six-peak and eight-peak absorption spectra form for the two cases respectively. However, for the strong coupled fields, the absorption spectra with seven or nine peaks arise due to the dressed levels. With the adjustable coupled detunings, the transparent windows of EIT and CHB can be manipulated according to the need, and with the technique of manipulation of spectra, the enhanced atomic absorption with two subnatural-linewidth peaks can be achieved.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844887","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}