Science China Physics, Mechanics & Astronomy最新文献_第7页

Membrane-cytoskeleton coupling modulates the force threshold for Piezo1 activation: A theoretical framework 膜-细胞骨架耦合调节Piezo1激活的力阈值：一个理论框架

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3068-4

Xi Wang, Guo-Yang Li, Xi-Qiao Feng

{"title":"Membrane-cytoskeleton coupling modulates the force threshold for Piezo1 activation: A theoretical framework","authors":"Xi Wang, Guo-Yang Li, Xi-Qiao Feng","doi":"10.1007/s11433-026-3068-4","DOIUrl":"10.1007/s11433-026-3068-4","url":null,"abstract":"<div><p>Piezo1 ion channels transduce mechanical forces through the flattening of their intrinsically curved transmembrane dome, a process modulated by the cortical cytoskeleton. Although experiments consistently show that the cytoskeleton elevates the channel’s half-activation tension—a phenomenon known as mechanoprotection—its mechanistic basis has remained unclear. Here, we develop a continuum framework that couples the elastic Piezo1 dome, the Helfrich lipid bilayer, and a two-dimensional tilted-spring model of the cortical cytoskeleton. Our results indicate that cytoskeletal coupling pre-flattens the dome, spatially confines the membrane footprint, and reduces the projected-area reservoir available for gating. These effects raise the half-activation tension from 1.90 to 3.15 mN/m, broaden the gating curve, and convert Piezo1 from a sharp binary switch into a graded mechanical rheostat, in quantitative agreement with single-channel measurements. Parameter-matched comparison with a vertical Winkler foundation model shows that the mechanoprotective shift is dominated by vertical cytoskeletal support, while lateral tension renormalisation provides only a secondary correction. This work offers a unified, energetics-based explanation for cytoskeletal mechanoprotection, highlighting how membrane-cytoskeleton coupling reshapes the energetic landscape of Piezo1 gating and expands its physiological dynamic range.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 10","pages":""},"PeriodicalIF":7.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Non-monotonic dependence of feedthrough on dimensionless layer thickness in shock-accelerated fluid layers 激波加速流体层中馈通对无量纲层厚的非单调依赖性

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3038-6

Ning Zhou, Zhigang Zhai, Xisheng Luo

引用次数: 0

Circular polarization images of Sgr A* under different magnetic field geometries Sgr A*在不同磁场几何形状下的圆偏振图像

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3031-2

Hao Yin, Songbai Chen, Jiliang Jing

{"title":"Circular polarization images of Sgr A* under different magnetic field geometries","authors":"Hao Yin, Songbai Chen, Jiliang Jing","doi":"10.1007/s11433-026-3031-2","DOIUrl":"10.1007/s11433-026-3031-2","url":null,"abstract":"<div><p>Sgr A* exhibits a persistent negative circular polarization (CP) at 230 GHz, offering a powerful probe of the magnetic field geometry in its accretion flow. Using a stationary semi-analytic radiatively inefficient accretion flow (RIAF) model in Kerr spacetime with polarized radiative transfer, we systematically analyze CP images for six poloidal magnetic field configurations across varying black hole spins, inclinations, and field polarities. We find that the CP production is dominated by Faraday conversion in radial, parabolic, quadrupole, and combined magnetic field geometries, while it is dominated by intrinsic emission in dipole and vertical magnetic field configurations. The radial and parabolic configurations produce the polarity-invariant net CP, while dipole and vertical fields yield the polarity-sensitive one. As the accretion disk is prograde with respect to the black hole spin, the CP production across all six field geometries is found to be lower in the high-spin case, while the situation is more complicated in the retrograde case. Moreover, the net CP observed from edge-on views <i>V</i><sub>net</sub> ≈ 0 except for the quadrupole geometry. Comparing with ALMA data, the reversed-field model is excluded at high inclinations, and then the magnetic field geometry of Sgr A* is constrained.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 10","pages":""},"PeriodicalIF":7.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Nuclear modification of heavy flavor decayed dielectrons in relativistic heavy-ion collisions 相对论重离子碰撞中重味衰变二电子的核修饰

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3046-8

Lejing Zhang, Wen-Jing Xing, Shanshan Cao, Guang-You Qin

{"title":"Nuclear modification of heavy flavor decayed dielectrons in relativistic heavy-ion collisions","authors":"Lejing Zhang, Wen-Jing Xing, Shanshan Cao, Guang-You Qin","doi":"10.1007/s11433-026-3046-8","DOIUrl":"10.1007/s11433-026-3046-8","url":null,"abstract":"<div><p>Dielectrons from heavy flavor hadron decays not only constitute a crucial background to their thermal spectrum in high-energy nuclear collisions, from which the temperature of the quark-gluon plasma (QGP) is extracted, but also provide a valuable probe of heavy quark interactions with the QGP. Using a linear Boltzmann transport (LBT) model to describe heavy quark evolution inside the QGP and a hybrid fragmentation-coalescence model for their hadronization, we find that heavy quark energy loss softens the invariant mass spectrum of their decayed dielectrons and yields a higher value of the extracted QGP temperature, while coalescence hardens the spectrum and yields a lower value. Taking into account full medium effects leads to higher values of the extracted temperature than using vacuum baselines of heavy flavor decayed dielectrons in analyzing the experimental data. In addition, we find the angular correlations between dielectron pairs are sensitive to heavy quark interactions with the QGP: the radial flow of the QGP enhances the near-side correlations, and scatterings between heavy quarks and the QGP broaden the away-side correlations, with elastic and string interactions playing a dominant role.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 10","pages":""},"PeriodicalIF":7.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Critical hydrogen contents enable giant magnetocaloric effect and brittle-to-ductile transition in amorphous nanocomposites 临界氢含量使非晶纳米复合材料的巨磁热效应和脆性向韧性转变成为可能

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3041-4

Cheng Chen, Qianzi Yang, Qiang Luo, Fan Hu, Mingjie Zhang, Mingqiang Zhang, Yao Zhang, Qianqian Wang, Shuangxi Song, Zhijun Guo, Baolong Shen

{"title":"Critical hydrogen contents enable giant magnetocaloric effect and brittle-to-ductile transition in amorphous nanocomposites","authors":"Cheng Chen, Qianzi Yang, Qiang Luo, Fan Hu, Mingjie Zhang, Mingqiang Zhang, Yao Zhang, Qianqian Wang, Shuangxi Song, Zhijun Guo, Baolong Shen","doi":"10.1007/s11433-026-3041-4","DOIUrl":"10.1007/s11433-026-3041-4","url":null,"abstract":"<div><p>The development of magnetocaloric materials is fundamentally constrained by the need to simultaneously achieve a giant magnetocaloric effect (MCE) and mechanical toughness. Here, we show that this bottleneck is overcome by treating hydrogen as a microstructural tuning parameter in a Gd-based amorphous alloy (AMA). Through controlled hydrogenation, we observe small 1–2 nm GdH<sub>2</sub> clusters progressively evolving into a network of 2–5 nm nanocrystals. This engineered microstructure tailors the elastic modulus distribution, transforms magnetic transition behavior, and modifies the underlying critical dynamics. Notably, two distinct hydrogen concentration thresholds govern variations in mechanical and magnetocaloric performance. The brittle-to-ductile transition occurs at 0.83 wt.% hydrogen. At this point, a critical density of GdH<sub>2</sub> nanoclusters enables the formation of a connected shear transformation zone network and facilitates synergistic deformation between the nanoclusters and the amorphous matrix. In contrast, the giant MCE emerges only above 1.38 wt.% hydrogen, when a continuous antiferromagnetic GdH<sub>2</sub> skeleton forms and suppresses long-range ferromagnetic exchange. The critical window (≽ 1.38 wt.% hydrogen) thus delivers an unprecedented combination of giant MCE (≽ 16.14 J kg<sup>−1</sup> K<sup>−1</sup> at 5 T) and large plastic strain (> 40%), thereby overcoming the challenge of achieving both concurrently. Our work establishes hydrogen-mediated nanocrystal engineering as a paradigm for designing high-performance nanocomposites.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 10","pages":""},"PeriodicalIF":7.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Moderate electron correlation in altermagnet CrSb 交变磁体CrSb的适度电子相关

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3042-7

Zhihui Chen, Yuanhe Song, Xia Lou, Chihao Li, Xiuhua Chen, Yilin Wang, Yixuan Luo, Yanfeng Guo, Rui Peng, Haichao Xu, Donglai Feng

引用次数: 0

Interface-tailored magnetoelectric coupling by Janus altermagnetic bilayer Janus交替磁双分子层的界面定制磁电耦合

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3033-7

Shengshi Li, Weixiao Ji, Changwen Zhang, Weixin Liu, Jianping Zhang, Yaping Wang, Wei Sun, Shishen Yan

{"title":"Interface-tailored magnetoelectric coupling by Janus altermagnetic bilayer","authors":"Shengshi Li, Weixiao Ji, Changwen Zhang, Weixin Liu, Jianping Zhang, Yaping Wang, Wei Sun, Shishen Yan","doi":"10.1007/s11433-026-3033-7","DOIUrl":"10.1007/s11433-026-3033-7","url":null,"abstract":"<div><p>The pursuit of customizable magnetoelectric coupling in emerging altermagnets is significant for meeting diverse functional requirements in flexible, efficient, and low-power spintronic applications. However, a major challenge remains in simultaneously achieving switchable ferroelectric polarization and tunable magnetic order. Here, we propose that Janus altermagnetic bilayers offer a solution by enabling engineered control of magnetic order alongside intrinsic sliding ferroelectricity through Janus interface design. Using a Janus altermagnetic Mo<sub>2</sub>Cl<sub>3</sub>Br<sub>3</sub> bilayer as a prototype, we find that selective ClCl or BrBr interface configurations yield distinct magnetoelectric coupling phenomena. The ClCl interface bilayer exhibits interlayer antiferromagnetic coupling and sliding ferroelectricity, where ferroelectric polarization reversal switches the band spin splitting and the spin polarization of the spin currents, but leaves the magneto-optical Kerr signal unchanged. In contrast, the BrBr interface bilayer shows interlayer ferromagnetic coupling and sliding ferroelectricity, where the magneto-optical Kerr signal is reversible upon ferroelectric polarization switching, while the spin splitting remains fixed. The Janus interface design in this work establishes a universal paradigm for on-demand magnetoelectric control and provides an alternative material platform for developing advanced spintronic logic and memory devices.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 10","pages":""},"PeriodicalIF":7.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

High-gain multiband metasurface antennas driven by bound states in the continuum for extended millimeter-wave communications 用于扩展毫米波通信的连续介质束缚态驱动的高增益多波段超表面天线

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3032-6

Zhenxiong Li, Zhihui He, Yashan Huo, Xiongxiong Wu, Wei Cui, Zhimin Yang, Ye Zhao, Lei Zhang, Shasha Liang, Zhaoyang Liu, Kaiyan Xu, Zhancheng Li, Shuqi Chen

{"title":"High-gain multiband metasurface antennas driven by bound states in the continuum for extended millimeter-wave communications","authors":"Zhenxiong Li, Zhihui He, Yashan Huo, Xiongxiong Wu, Wei Cui, Zhimin Yang, Ye Zhao, Lei Zhang, Shasha Liang, Zhaoyang Liu, Kaiyan Xu, Zhancheng Li, Shuqi Chen","doi":"10.1007/s11433-026-3032-6","DOIUrl":"10.1007/s11433-026-3032-6","url":null,"abstract":"<div><p>The stringent requirements for ultrahigh gain, programmable beamforming, and multiband coexistence in 5G/6G extended millimeter-wave communications are fundamentally constrained by the intrinsic bandwidth-gain trade-off of conventional metasurface antennas. Here, we propose a metasurface antenna that integrates bound states in the continuum (BICs) with aperture coupling to improve field confinement, radiation control, and impedance matching. By exploiting symmetry-protected and quasi-BIC resonances with suppressed radiation leakage, the proposed architecture enables selective resonance excitation and controllable energy localization across 20–42 GHz. Through geometric optimization of quasi-BIC meta-atoms and parametric tuning of coupling apertures, the radiating metasurface achieves an ultrahigh <i>Q</i>-factor of 2.1×10<sup>6</sup>, yielding a simulated peak gain of 22.4 dBi at 25.7 GHz and a maximum measured gain of 18.1 dBi, together with significantly improved return-loss performance compared with conventional designs. The results show that the combination of symmetrical perturbation and aperture-mediated coupling provides an effective route to balancing gain, frequency selectivity, and multiband operation. This work offers a promising strategy for high-efficiency and frequency-agile antennas in future wireless communication and sensing systems.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 10","pages":""},"PeriodicalIF":7.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Efficient screening of low liquidus Ti-based amorphous brazing filler metals via machine learning with limited experimental iteration 基于机器学习的低液相态钛基非晶钎焊填充金属的有效筛选

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-26 DOI: 10.1007/s11433-026-3048-3

Xuhe Gong, Kaiyang Deng, Jiazi Bi, Peijing Tian, Weihong Zheng, Ran Li, Ruijuan Xiao

{"title":"Efficient screening of low liquidus Ti-based amorphous brazing filler metals via machine learning with limited experimental iteration","authors":"Xuhe Gong, Kaiyang Deng, Jiazi Bi, Peijing Tian, Weihong Zheng, Ran Li, Ruijuan Xiao","doi":"10.1007/s11433-026-3048-3","DOIUrl":"10.1007/s11433-026-3048-3","url":null,"abstract":"<div><p>The conventional “trial-and-error” strategy for amorphous alloy composition development is inherently inefficient and resource-intensive, particularly in the context of complex multi-component systems where comprehensive phase diagrams are often unavailable. In this work, we introduce a machine learning (ML) driven iterative framework for the accelerated design of low-liquidus-temperature Ti-based amorphous alloys in multicomponent alloy systems. By targeting low-liquidus-temperature Ti-based alloys and selecting Cu as the key alloying element, we employ regression models to predict liquidus temperatures across 60 ternary and 11 quaternary systems. Through iterative incorporation of limited experimental feedback from prior prediction rounds, the model progressively improves its predictive accuracy and facilitates efficient identification of compositional regions associated with lower melting temperature. Using this framework, the optimal amorphous composition Ti<sub>60</sub>Cu<sub>11</sub>Ni<sub>19</sub>Zr<sub>10</sub> is identified, exhibiting a low liquidus temperature of 1121 K. This methodology not only improves the reliability of the ML predictions with limited experimental iterations, but also provides a scalable and efficient paradigm for the future development of amorphous alloys with extensive design flexibility of properties.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 10","pages":""},"PeriodicalIF":7.2,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Enhancement of Unruh quantum Otto engine by quadratic coupling 二次耦合增强Unruh量子奥托引擎

IF 7.2 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2026-08-25 DOI: 10.1007/s11433-026-3035-4

Xiaofang Liu, Zehua Tian, Jieci Wang

{"title":"Enhancement of Unruh quantum Otto engine by quadratic coupling","authors":"Xiaofang Liu, Zehua Tian, Jieci Wang","doi":"10.1007/s11433-026-3035-4","DOIUrl":"10.1007/s11433-026-3035-4","url":null,"abstract":"<div><p>We investigate an Unruh quantum Otto engine that employs a two-level Unruh-DeWitt detector as the working medium and is coupled to a massless scalar field. Going beyond the limitations of previous studies that focused solely on uniformly accelerated motion with linear coupling, this paper examines composite detector trajectories with four-acceleration and four-velocity components and investigates how quadratic coupling affects the behavior of quantum heat engine. We find that the four-velocity component modifies the two-point correlation function of the vacuum field, thereby altering the effective temperature predicted by the Unruh effect. The key finding is that, for quadratic coupling, the four-velocity component enhances the work output of the heat engine independent of the acceleration magnitude in the nonrelativistic limit, thereby overcoming the bottleneck in which linear coupling is effective only in low-acceleration regimes. Furthermore, the work output of the quadratically coupled heat engine consistently outperforms that of the linearly coupled one. We also show that, in the ultrarelativistic limit, relativistic corrections cause the detector to behave as a closed system, thereby producing no work. It is demonstrated that the quadratic coupling and the four-velocity component associated with the composite trajectory can serve as novel thermodynamic resources, thereby effectively expanding the operational potential of the heat engine.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"69 10","pages":""},"PeriodicalIF":7.2,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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