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        <title>Frontiers in Physics | New and Recent Articles</title>
        <link>https://www.frontiersin.org/journals/physics</link>
        <description>RSS Feed for Frontiers in Physics | New and Recent Articles</description>
        <language>en-us</language>
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        <pubDate>2026-04-09T11:19:40.798+00:00</pubDate>
        <ttl>60</ttl>
        <item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1834152</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1834152</link>
        <title><![CDATA[Editorial: Mathematical physics methods and advanced materials in Frontier applications for underground engineering]]></title>
        <pubdate>2026-04-09T00:00:00Z</pubdate>
        <category>Editorial</category>
        <author>Yiying Feng</author><author>Jiangyu Wu</author><author>Weiqiang Chen</author><author>Yiming Wang</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1778336</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1778336</link>
        <title><![CDATA[A novel approach for fair incentive social physical data based on blockchain-federated learning]]></title>
        <pubdate>2026-04-08T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Heba G. Mohamed</author><author>Hung Tran-Huy</author><author>Trang Hoang-Thu</author><author>Iyas Qaddara</author><author>Bong Jun Choi</author><author>Asma Hassan Alshehri</author><author>Ijaz Ahad</author><author>Hui Liu</author>
        <description><![CDATA[IntroductionA key research focus in FL is the incentive mechanism. To ensure that all data owners actively contribute their data for model training, it is necessary to establish a fair incentive system that encourages them to share useful data. A well-functioning incentive system enables all participants to continuously and effectively train models, which in turn enhances the accuracy of the ultimately trained federated model.MethodsThis paper proposes a new algorithm for optimizing the incentive mechanism. Initially, clients who possess high-quality data can participate in the training due to their reputation value. The client entrusted local data training to the high-performance fog node by auctioning local training tasks to it. The aim of this action was to improve the efficiency of local training and tackle the problem of differing performance levels among clients. Finally, the global gradient aggregation algorithm removes malicious clients from the local gradient.Results and DiscussionResults from the simulation demonstrate that the suggested algorithm outperforms current algorithms.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1789490</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1789490</link>
        <title><![CDATA[Thermal and mechanical stability enhancement of a 635 nm Littman-type external cavity diode laser]]></title>
        <pubdate>2026-04-07T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Maolei Zhang</author><author>Jinlian Chen</author><author>Yong Wang</author><author>Xiaofeng Wang</author><author>Hongpeng Wu</author><author>Fang Dong</author><author>Lei Dong</author>
        <description><![CDATA[Precise wavelength control in Littman-type external cavity diode laser (ECDL) is crucial for high-resolution spectroscopy and metrology, yet their stability is often limited by thermo-mechanical perturbations. Despite active temperature control of the laser diode, the thermal and mechanical response of the entire cavity structure remains a critical challenge. This study investigates these effects using a multi-physics coupled three-dimensional finite-element model, incorporating realistic parameters of the laser diode, diffraction grating, mirror assembly, and thermoelectric controller to analyze temperature distribution, thermal stress, and structural deformation under varying ambient temperatures. The results show that while active temperature control effectively suppresses thermal fluctuations in the laser diode, significant temperature non-uniformity develops on the diffraction grating as the ambient temperature increases, with the surface temperature difference rising from 3.31 K to 6.91 K. Thermally induced structural deformation leads to changes of 0.453 μm in the internal cavity length, 10.983 μm in the external cavity length, and an angular deviation of 0.022 in the optical feedback path. These coupled effects result in an output wavelength drift of 0.191 nm (corresponding to a wavelength-temperature sensitivity of 9.55 pm/K), exceeding the stability requirements for precision wavelength control. The analysis clarifies the dominant thermo-mechanical mechanisms limiting wavelength stability in Littman-type ECDL and provides guidance for structural and thermal optimization in precision laser applications. A subsequent sensitivity analysis reveals that under realistic thermoelectric controller (TEC) stabilization (±0.01 K), the thermo-mechanically induced wavelength drift is suppressed to ±0.0955 pm, validating the engineering relevance of the proposed model.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1770329</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1770329</link>
        <title><![CDATA[Orthorhombic SrVSi2O7 as a potential magnetic second-order topological insulator with spin-polarized hinge states]]></title>
        <pubdate>2026-04-07T00:00:00Z</pubdate>
        <category>Brief Research Report</category>
        <author>Yang Li</author><author>Xiang Han</author>
        <description><![CDATA[Three-dimensional second-order topological insulators (3D SOTIs) have attracted considerable attention in recent years; however, realistic material realizations to date are overwhelmingly restricted to nonmagnetic systems. In this work, based on first-principles calculations, we demonstrate that bulk SrVSi2O7—an experimentally realized material with an orthorhombic crystal structure—is an intrinsic 3D ferromagnetic SOTI. We find that the nontrivial bulk band gap and the associated fractional topology are exclusively carried by the spin-up channel. For SrVSi2O7, the spin-up channel hosts a quantized fractional topological charge (Q(2) = e/2), whereas the spin-down channel remains topologically trivial (Q(2) = 0). Consistent with the higher-order bulk–boundary correspondence, SrVSi2O7 is confirmed to host topologically protected and ultra-clean hinge states exclusively in the spin-up channel, well isolated from the bulk bands. Distinct from previously reported nonmagnetic 3D SOTIs, the hinge states in SrVSi2O7 are intrinsically spin polarized, highlighting its potential as a platform for topological spintronic applications.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1768466</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1768466</link>
        <title><![CDATA[An information-theory examination of the “upstream-turbulence effect” in solar-wind/magnetosphere coupling]]></title>
        <pubdate>2026-04-02T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Simon Wing</author><author>Joseph E. Borovsky</author>
        <description><![CDATA[IntroductionCorrelations between upstream solar-wind turbulence—measured by the amplitude of magnetic-field fluctuations (ΔB/B)—and increases in geomagnetic activity have been reported by many research groups. However, questions remain as to whether this relationship reflects a true cause-and-effect interaction. This study investigates whether solar-wind turbulence exerts a causal influence on the magnetosphere.MethodsTransfer entropy (TE) was used as a quantitative measure of causality to evaluate information transfer from ΔB/B to geomagnetic indices AE and Dst. The magnitude and lag time (τ) of information transfer were compared with those derived from solar wind velocity (Vsw) and from reconnection-driven Rquick and Newell solar wind coupling functions.ResultsThe analysis shows that ΔB/B exerts a real but weak causal influence on the magnetosphere, operating over relatively long time scales. Information transfer from ΔB/B to AE and Dst is approximately an order of magnitude smaller and peaks at larger lag times than transfers from Rquick and Newell solar wind coupling functions. In contrast, the lag times for information transfer from ΔB/B and Vsw to AE and Dst are comparable. The information transfer from ΔB/B to AE is approximately 45% of that from Vsw, while the transfer from ΔB/B to Dst is about an order of magnitude smaller than that from Vsw.DiscussionThe similarity in response times between ΔB/B and Vsw suggests that turbulence interacts with the magnetosphere primarily through viscous-like processes rather than reconnection-driven mechanisms. Although both ΔB/B and Vsw influence the magnetosphere through viscous interactions, ΔB/B exhibits lower geoeffectiveness. These findings indicate that solar wind turbulence affects different magnetospheric regions and phenomena to varying degrees and confirm that its influence, while real, is relatively weak.]]></description>
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        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2025.1727157</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2025.1727157</link>
        <title><![CDATA[Overview of stressed liquid crystal]]></title>
        <pubdate>2026-04-01T00:00:00Z</pubdate>
        <category>Mini Review</category>
        <author>Jiahui Chen</author><author>Lin Xu</author><author>Chi Zhang</author><author>Xitong Liang</author><author>Ziling Chen</author><author>Han Zheng</author><author>Xu Wang</author><author>Zhen Pang</author><author>Dongshen Lv</author><author>Hengbo Huang</author><author>Gaoyang Liu</author><author>Jiacheng Dong</author><author>Chenxuan Ren</author><author>Youyou Hu</author>
        <description><![CDATA[Stressed liquid crystal (SLC), discovered 20 years ago in the study of polymer dispersed liquid crystals and polymer network liquid crystals, has attracted great interest from researchers. SLC achieves decoupling of liquid crystal film thickness and switching speed, representing a significant breakthrough in fast response and large phase modulation materials. This paper reviews the related concepts of stressed liquid crystals, precautions in their preparation, and summarizes factors affecting their electro-optic properties; it also introduces research progress and discusses future development directions in applications such as smart glass, tunable attenuators, Fourier spectrometers, adaptive optics, liquid crystal shutters, tunable gratings, and optical phased arrays. Analysis of existing research indicates that stressed liquid crystals have important applications and industrial potential in high-speed dynamic networks, passive smart dimming, miniature Fourier spectrometers, AR/VR dynamic focusing, laser communication beam control, and high-resolution liquid crystal shutters.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1834371</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1834371</link>
        <title><![CDATA[Correction: Investor herding behavior in social media sentiment]]></title>
        <pubdate>2026-04-01T00:00:00Z</pubdate>
        <category>Correction</category>
        <author>Jinjoo Yoon</author><author>Gabjin Oh</author>
        <description></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1775533</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1775533</link>
        <title><![CDATA[Transient search driven random forest model for predicting diluted heavy crude oil viscosity]]></title>
        <pubdate>2026-03-31T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Sushindh Anandan</author><author>Jayasudha M</author>
        <description><![CDATA[Viscosity is a basic thermophysical property that determines the flow characteristics of single phase oil such as crude oil. Accurate estimation of diluted heavy crude oil viscosity is important for laboratory characterization and operational handling of heavy oils. In this research, a ML based approach is presented for estimating the viscosity of diluted heavy crude oil samples measured in laboratory conditions. A total of 245 experimental datasets were collected using a Brookfield DV2T viscometer. In this experiment, heavy crude oil was mixed with lighter oil at different dilution rates and temperatures. The major input parameters considered are heavy crude oil viscosity, lighter oil viscosity, dilution rate and temperature. To improve the performance of the model, Min-Max normalization was used for data scaling and Kernel Principal Component Analysis (KPCA) was used for nonlinear feature extraction. A Transient Search driven Random Forest Regression (TS-RFR) model was introduced to optimize hyperparameters and enhance predictive performance. The performance of the proposed model was assessed using Root Mean Squared Error (RMSE), Mean Absolute Error (MAE), Mean Squared Error (MSE), coefficient of determination (R2) and Percentage of Accuracy-Precision (PAP). The comparative analysis with the existing ML models, such as MLP-ANN, SVR and LightGBM, reveals that the proposed TS-RFR model performs better with RMSE = 0.2976, MAE = 0.1005, MSE = 0.1015, R2 = 97.35% and PAP = 92.35%. The analysis clearly shows that the proposed model is a reliable and efficient tool for estimation of diluted crude oil viscosity.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1762827</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1762827</link>
        <title><![CDATA[Mathematical analysis of fractional-order convection–reaction–diffusion equations under the Caputo fractional derivative]]></title>
        <pubdate>2026-03-31T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Mashael M. AlBaidani</author>
        <description><![CDATA[The main objective of this study is to employ two unique methods to approximately solve time-fractional convection–reaction–diffusion equations (CRDEs). The suggested techniques combine the Adomian decomposition approach, the homotopy perturbation method, and the Yang transform. He’s polynomials and Adomian polynomials are employed to address the nonlinearity that develops in our assumed problems. To clarify the efficacy of the employed schemes, three test examples are taken into account. This article considers sophisticated approaches and the fractional operator in this aspect to obtain satisfactory approximations to the provided problems. We first build the Yang transforms of the Caputo fractional derivative and apply them for CRDEs to obtain improved approximations after a finite number of iterations. The two suggested methods are used to generate some extremely accurate analytical approximations. The approximations obtained through these methods are represented as convergent series solutions. The solution obtained using the suggested methods converges at the desired rate to the precise solution. To show the usefulness of the offered techniques, we provide some graphical representations of the precise and analytical results, which are in excellent agreement with one another. In addition, we used several tables for different fractional orders to visually represent the physical behavior of the approximate solution. The convergence of the fractional solutions towards integer-order solutions is examined for the efficacy of the current strategies. The proposed methods are validated by solving four important cases. The suggested solutions are proven to be very effective, straightforward, and appropriate for other nonlinear issues raised in science and engineering.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1808380</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1808380</link>
        <title><![CDATA[Underwater 3D sound speed field reconstruction based on block term tensor decomposition]]></title>
        <pubdate>2026-03-30T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Hao Wu</author><author>Maofa Wang</author><author>Jiabao Zhao</author>
        <description><![CDATA[The three-dimensional sound speed field (SSF) is of great significance in underwater acoustic research; however, the high cost of maritime observation often leads to sparse and limited measurement data, making accurate SSF reconstruction a challenging yet valuable problem. Traditional inversion methods frequently suffer from high data requirements, an inability to process complex spatiotemporal features, and issues regarding accuracy and stability. To address these challenges, this paper proposes a 3D SSF reconstruction method that combines Block Term Tensor Decomposition (BTD) with sparse reconstruction. Specifically, BTD is utilized to extract latent information and structural features from high-dimensional historical ocean sound speed data, enabling precise 3D SSF reconstruction by integrating a small number of newly acquired regional observations through sparse reconstruction techniques. The proposed method was validated using the Argo dataset and experimental sea trial data from underwater gliders. Experimental results demonstrate that when reconstructing with limited observations, the BTD-based approach improves reconstruction accuracy by more than 49.25% compared to traditional Empirical Orthogonal Function and Tucker decomposition methods. Overall, utilizing BTD for 3D underwater sound speed field reconstruction represents a novel, high-precision, and cost-effective methodology that effectively overcomes data sparsity constraints.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1790944</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1790944</link>
        <title><![CDATA[The design of a compact conduction-cooling system for SRF material characterization]]></title>
        <pubdate>2026-03-30T00:00:00Z</pubdate>
        <category>Methods</category>
        <author>Gai Wang</author><author>Yue Zhang</author><author>Zhongxiang Xu</author><author>Shengwen Quan</author><author>Manqian Ren</author><author>Zeqin Yao</author><author>Fang Wang</author><author>Ziyu Wang</author><author>Shichuan Ding</author><author>Jun Tao</author>
        <description><![CDATA[The precise and efficient testing of the RF performance of superconducting radio frequency (SRF) samples under superconducting conditions serves as the fundamental support for developing new SRF materials. The traditional SRF material RF performance testing systems have technical bottlenecks such as strong dependence on liquid helium, long testing cycles, and high operating costs. In this paper, the design and Multiphysics simulation analysis of a novel conduction-cooling RF performance testing system for SRF materials are presented. The system is numerically predicted to achieve 50 mT and nΩ-level measurement of the surface resistance (Rs) without liquid helium cooling. The core part of the system is an optimized mushroom-type sample host cavity, which operates primarily in the 3.9 GHz TE011 mode, with a sample radius of 33 mm. A Nb3Sn coating on the inner cavity surface is proposed in the design to lower microwave loss, and the entire conduction-cooling structure is engineered and analyzed numerically. Additionally, the resolution and measurement range of Rs are systematically evaluated via Multiphysics simulations, showing the potential of the design for low-cost, high-quality SRF material characterization.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1782845</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1782845</link>
        <title><![CDATA[Hyper-S2IR: a model for characterizing higher-order interactions and dynamics in public opinion dissemination]]></title>
        <pubdate>2026-03-26T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Chunying Zhang</author><author>Xiangyu Li</author><author>Lu Liu</author><author>Jing Ren</author><author>Jiang Ma</author><author>Liyan Zhang</author>
        <description><![CDATA[Traditional public opinion diffusion models generally assume interactions between individuals as binary pair-wise effects, which struggle to capture the higher-order complexities of multi-group interactions in social networks—such as group discussions in WeChat and topic reposting on Weibo. Moreover, these models fail to adequately depict the nonlinear trust accumulation mechanisms and individual heterogeneity inherent in the diffusion process. Therefore, the paper proposes a hypergraph-based Hyper-S2IR model for disseminating public opinion. The “Goebbels effect” is operationalized by leveraging the hypergraph structure: a susceptible node’s risk of infection is proportional to its hyperdegree, mathematically representing the cumulative exposure to information from multiple sources within different hyperedges. Our model introduces two types of communicators (HI1 and HI2) with different motivations and capabilities, thereby systematically depicting the inherent heterogeneity of the communication group. Through theoretical derivation, we derive a novel basic reproduction number R0 that explicitly incorporates the hyperdegree distribution of the hypergraph. This R0 provides a threshold for dissemination dynamics: When R0 > 1, the public opinion will continue to spread and converge to a stable public opinion prevalence equilibrium point; when R0 < 1, the public opinion will gradually disappear. Critically, the expression for R0 reveals how higher-order group interactions, encoded in the hyperdegree, fundamentally alter the spreading threshold compared to traditional pairwise networks. Numerical simulations verify the theoretical conclusions and demonstrate that the hypergraph structure significantly accelerates the spread and expands the scale of public opinion compared to traditional network structures. This work provides theoretical support and a quantitative basis for analyzing public opinion dissemination mechanisms and formulating intervention strategies.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1795521</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1795521</link>
        <title><![CDATA[Inversion of the forest dead fuel moisture content by UAV multisepectral image under the new leaves shade]]></title>
        <pubdate>2026-03-26T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Ye Wang</author><author>Xinning Wang</author><author>Jian Xing</author>
        <description><![CDATA[Forest dead fuel moisture content (FDFMC) is an important factor affecting the occurrence and spread of forest fires. When the leaves have completely fallen, because of no leaves shade, the use of UAV multispectral cameras can achieve the spectral images easily. However, during the spring fire prevention period, it is difficult to obtain the full spectral images because of the shade of new leaves, therefore the inversion accuracy of FDFMC would be greatly affected by it. In this paper, an improved ConvNeXt convolutional neural network is proposed to predict FDFMC based on UAV multispectral camera data from 18 to 25 April 2025 in the urban forestry demonstration in Harbin City. A total of 6,031 sets of photos were captured using UAV multispectral camera, with each set containing six single-band images. The K-means clustering algorithm is used to segment the UAV multispectral images to extract the feature information for reducing the influence of new leaves shade. The trained model achieved 1.38% for MAE and 4.54% for RMSE. The experimental results showed that the improved ConvNeXt model can accurately predict the FDFMC. The new method proposed in this paper for predicting the FDFMC using the UAV multispectral images has feasibility and reference significance.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1779859</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1779859</link>
        <title><![CDATA[Symmetry, law invariance, and the physical admissibility of internal time]]></title>
        <pubdate>2026-03-26T00:00:00Z</pubdate>
        <category>Hypothesis and Theory</category>
        <author>Dong-Gyun Han</author>
        <description><![CDATA[The pacemaker–accumulator model has long dominated theories of internal time, yet it remains structurally disconnected from the physical principles that define time in the external world. In physics, time is not generated by an autonomous mechanism but operationally constructed from regular processes governed by invariant laws. Temporal admissibility depends on symmetry, local equivalence, and reproducibility across physical implementations—not on the existence of an internally generated pulse stream. By contrast, prevailing models of internal timing posit a self-contained mechanism whose linkage to shared physical parameters is left unspecified, thereby separating internal temporal organization from the conditions that legitimize time in physics. We argue that this separation is conceptually untenable. Any viable account of internal time must satisfy the same law-based criteria that govern physical clocks. Under sustained gravito-inertial loading, regular otolith afferents converge to stable tonic firing in a steady-state regime. This regularity reflects the steady-state output of sensory transduction under constant gravito-inertial input, rather than the presence of a self-sustained oscillator. Internal time, on this view, is not produced but referenced. Grounded in symmetry, local equivalence, and relational informational accessibility, vestibular dynamics provide a physically admissible sensory reference against which events are compared, restoring continuity between internal temporal organization and the operational foundations of physical time.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1795185</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1795185</link>
        <title><![CDATA[The effect of gold nanoparticles on the physical and chemical properties of water after drops fall from a height of several meters and hit from a hard surface]]></title>
        <pubdate>2026-03-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Alexander V. Simakin</author><author>Ilya V. Baimler</author><author>Valeriy A. Kozlov</author><author>Alexey M. Lomonosov</author><author>Roman Yu. Pishchalnikov</author><author>Ruslan M. Sarimov</author><author>Mikhail V. Dubinin</author><author>Vladimir I. Pustovoy</author><author>Ivan A. Shcherbakov</author>
        <description><![CDATA[IntroductionNanofluids are known to be highly effective in droplet coolers. It is also known that the presence of nanoparticles in a water droplet significantly alters the nature of the droplet’s spreading after impact with a solid surface. The physics of this phenomenon is unclear, although it is known that the droplet viscosity, as well as the temperature and properties of the substrates on which the droplets impact, have an effect. It has been hypothesized that the observed phenomenon may be based on changes in the physicochemical properties of the liquid (pH, temperature, gas phase distribution, concentration of molecular oxygen and reactive oxygen species) in the presence of nanoparticles. Therefore, the aim of this work was to study the effect of gold nanoparticles on the physicochemical properties of water after droplets impact with a solid surface.MethodsLaser ablation in liquid, spectroscopy in the visible and ultraviolet range, DLS, TEM, luminescence, thermal oximetry, measurement of the concentration of hydrogen peroxide and hydroxyl radical, inhibitory analysis.ResultsLuminescence of water droplets and aqueous colloids of gold nanoparticles, arising when the drops fall from a height onto a solid surface, has been detected. It has been shown that the luminescence intensity increases with an increase in the impact force; an increase in the concentration of gold nanoparticles; an increase in the concentration of molecular oxygen dissolved in the liquid. After water droplets fall from height of several meters onto solid surface, the concentration of dissolved molecular oxygen in them decreases, the intensity of such degassing increases with an increase in the concentration of nanoparticles and the fall height. The phenomenon is largely due to the release of gas into the atmosphere due to the formation and floating up to the liquid-gas boundary of large gas bubbles, and to a lesser extent due to an increase in the droplet temperature upon impact. It has been shown that ROS generation is observed upon droplet impact on solid surface. The intensity of ROS generation depends on the fall height of the droplets and the content of nanoparticles in the droplets. The process that triggers ROS generation is probably the transition of oxygen molecules dissolved in water from the triplet to the singlet state.DiscussionThe processes we have discovered may bring us closer to understanding the mechanisms underlying the anomalous change in the pattern of droplet spreading after impact on a solid surface in the presence and absence of nanoparticles.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1752770</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1752770</link>
        <title><![CDATA[The R&D game of technological achievements in industrial parks under the “administrative committee + enterprise” model: a CPSS perspective]]></title>
        <pubdate>2026-03-25T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Meng Qiu</author><author>Haitao Ji</author><author>Miao Wang</author><author>Jifa Wang</author>
        <description><![CDATA[Under the background of digitalization and collaborative innovation, high-tech industrial parks have gradually evolved into complex innovation systems characterized by multi-agent interaction. From the perspective of social physics, this thesis constructs a tripartite evolutionary game model involving high-tech industrial parks under the “administrative committee + enterprise” mode, park technology enterprises, and academic research institutions within the CPSS (Cyber-Physical-Social System) framework, and analyzes the influence mechanisms of key parameters in the information layer, physical layer, and social layer on system stability through replicator dynamic equations and numerical simulation. The results indicate that cooperative R&D of scientific and technological achievements is not a linear process of input accumulation, but a nonlinear evolutionary system driven by cross-layer coupling relationships. The simulation results show that the level of value-added services, as the support intensity of the information layer, exhibits a significant threshold effect. Moderate information support can reduce information asymmetry and promote system convergence toward a collaborative equilibrium, whereas excessively low or excessively high levels may lead to system instability. Investment shareholding changes the stability interval of the system by influencing resource allocation and benefit distribution structures. Appropriate participation contributes to the formation of a risk-sharing mechanism, while excessive shareholding weakens enterprises’ incentives for R&D. The subsidy ratio reflects governance intensity in the social layer. Moderate intervention can promote the formation of collaboration, whereas excessive intervention may cause strategic distortion and system disturbance. Strategic returns constitute a key variable driving the system from a non-cooperative state to a stable collaborative equilibrium. When system-level collaborative benefits exceed a critical threshold, a cross-layer positive feedback mechanism emerges.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1816429</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1816429</link>
        <title><![CDATA[Integrable elastic fiber-optic tactile sensors for fingertip stress perception]]></title>
        <pubdate>2026-03-23T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Xinyue Weng</author>
        <description><![CDATA[Tactile sensors with high softness and multiplexing are highly desirable for applications in humanoid robotics and smart prosthetics. Current tactile sensors face bottlenecks in multi-channel dynamic sensing based on miniaturized and economical signal demodulation devices especially for manipulator grasping motion. Integrating tactile sensors into the manipulator fingertip and developing multi-channel chip scale optoelectronic demodulation device are promising to overcome previous limitations. Here, an integrable elastic fiber-optic tactile (IEFT) sensor enabled by a fiber-optic Sagnac interferometer is reported. The tactile sensor is fabricated by encapsulating a macro-bending fiber-optic Sagnac interferometer in an elastomeric silicone fingertip structure. The finger body is made of photosensitive resin, which fits perfectly with the fingers of a mechanical hand. Through optoelectronic signal demodulation integration, the tactile sensors array is able to distinguish different finger actions such as pressing, sliding, pinching, and gripping motion. Five-channel finger tactile sensors show an excellent stress sensing detection limit of 0.05 N and a response time less than 300 ms. Such tactile sensing system achieves miniaturized, economical dynamic measurement. The developed sensors array may pave the way for perception of surface shape and hardness, as well as robot hand motion recognition.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1806357</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1806357</link>
        <title><![CDATA[Efficient semi-quantum dialogue protocol using single-photon]]></title>
        <pubdate>2026-03-23T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Jian-Tao Cui</author><author>Jun-Yao Liu</author><author>Xiang-Jun Xin</author><author>Chao-Yang Li</author><author>Fa-Gen Li</author><author>Ling Zhang</author>
        <description><![CDATA[Semi-quantum dialogue (SQD) enables secure bidirectional communication even when one participant has limited quantum capabilities. In order to solve the problems of low efficiency and quantum resource constraints, an efficient SQD protocol using single-photon is proposed. In the SQD, one communicating party needs to have semi-quantum capabilities to complete the dialogue, which could consume lower quantum resource. Moreover, single photons as quantum channels significantly reduces both preparation and operational costs. Finally, decryption can be performed without any classical disclosure, effectively preventing potential information leakage. Security analysis demonstrates resilience against common attacks, including intercept-resend, measure-resend, entanglement-measurement, and Trojan horse attacks, with no information leakage. Compared with existing semi-quantum dialogue protocols, our proposed protocol consumes fewer quantum resources while achieving higher communication efficiency and enhanced security.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1705699</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1705699</link>
        <title><![CDATA[Evolutionary game analysis of multiple stakeholders in e-commerce intellectual property based on social co-governance theory]]></title>
        <pubdate>2026-03-23T00:00:00Z</pubdate>
        <category>Original Research</category>
        <author>Ji Li</author><author>Han-Yu Lu</author>
        <description><![CDATA[IntroductionEstablishing a social co-governance system for intellectual property (IP) protection in e-commerce is crucial for strengthening the IP protection framework, fostering a conducive business environment, and promoting the high-quality development of China’s e-commerce sector. MethodsGrounded in social co-governance theory, this study constructs a multi-stakeholder framework for e-commerce IP protection, encompassing the government, e-commerce platforms, operators, and consumers. An evolutionary game model is developed to capture stakeholders' strategic interactions, and numerical simulations are performed to examine the dynamic evolution of their behavioral strategies.ResultsThe results indicate that strategic decisions are significantly influenced by action costs and benefits, the intensity of rewards and penalties, and social reputation. The simulation analysis further shows that well-designed reward-punishment mechanisms can effectively enhance stakeholders’ incentives for IP protection.DiscussionThese mechanisms facilitate the emergence of a stable social co-governance equilibrium and enhance the overall effectiveness of IP protection in e-commerce environments. The findings provide theoretical insights and policy implications for improving collaborative governance mechanisms in digital marketplace regulation.]]></description>
      </item><item>
        <guid isPermaLink="true">https://www.frontiersin.org/articles/10.3389/fphy.2026.1829342</guid>
        <link>https://www.frontiersin.org/articles/10.3389/fphy.2026.1829342</link>
        <title><![CDATA[Correction: 10 kHz repetition rate picosecond green laser for high-accuracy satellite ranging]]></title>
        <pubdate>2026-03-23T00:00:00Z</pubdate>
        <category>Correction</category>
        <author>Zhongwei Fan</author><author>Xiaopeng Liu</author><author>Zhongping Zhang</author><author>Wendong Meng</author><author>Mingliang Long</author><author>Zhenao Bai</author>
        <description></description>
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