期刊：
OPTICS AND LASER TECHNOLOGY,2025年181:111582 ISSN：0030-3992
通讯作者：
Hai Lin
作者机构：
[Zihao Yu; Hai Lin; Rui Zhou] College of physical science and technology, Central China Normal University, Wuhan 430079, China;[Yiting Wang] Tobacco Hubei Industrial LLC, WUHAN Cigarette Factory, Wuhan 430000, China
通讯机构：
[Hai Lin] C;College of physical science and technology, Central China Normal University, Wuhan 430079, China
摘要：
Terahertz sensors with high sensitivity are essential for accurately detecting substances in various fields such as medical research, diagnostics, security, and molecular analysis. Their effectiveness relies on detecting small index changes that indicate a target, requiring resonance with an extremely high Q factor. Notably, taking advantage of topological corner states with narrow spectral widths and constant eigenfrequencies is a powerful strategy to attain high Q values. Combining the topological edge modes of valley twist states and high-order corner states, we have designed a topological sensor composed of a topological cavity and topological waveguide. The proposed sensor possesses an ultra-high Q value of up to 1.02×105. The exceedingly narrow linewidth of the topological cavity allows it to detect even the slightest changes in the spectrum, resulting in a high sensitivity of up to 2.06THz/RIU and a notable Figure of Merit (FoM) standing at 3.86×104. Moreover, the sensor is robust to structural disorder and defects inherent in fabrication processes, ensuring reliable performance in practical applications in different environments and manufacturing conditions.
作者机构：
[Yang, Xi-Yan] Yangtze Univ, Sch Phys & Optoelect Engn, Jingzhou 434023, Peoples R China.;[Lai, Xiao-Yu; Tan, Wei-Wei; Yang, Xi-Yan] Hubei Univ Educ, Res Ctr Astron, Wuhan 430205, Peoples R China.;[Tan, Wei-Wei] Cent China Normal Univ, Key Lab Quark & Lepton Phys, Minist Educ, Wuhan 430079, Peoples R China.;[Xu, Ren-Xin] Peking Univ, Sch Phys, Beijing 100871, Peoples R China.;[Xu, Ren-Xin] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China.
通讯机构：
[Lai, XY ] H;Hubei Univ Educ, Res Ctr Astron, Wuhan 430205, Peoples R China.
关键词：
dense matter;(stars:) pulsars: general;(stars:) gamma-ray burst: general
摘要：
Strangeon stars, which are proposed to describe the nature of pulsar-like compact stars, have passed various observational tests. The maximum mass of a non-rotating strangeon star could be high, which implies that the remnants of binary strangeon star mergers could even be long-lived massive strangeon stars. We study rigidly rotating strangeon stars in the slowly rotating approximation, using the Lennard-Jones model for the equation of state. Rotation can significantly increase the maximum mass of strangeon stars with unchanged baryon numbers, enlarging the mass-range of long-lived strangeon stars. During spin-down after merger, the decrease of radius of the remnant will lead to the release of gravitational energy. Taking into account the efficiency of converting the gravitational energy luminosity to the observed X-ray luminosity, we find that the gravitational energy could provide an alternative energy source for the plateau emission of X-ray afterglow. The fitting results of X-ray plateau emission of some short gamma-ray bursts suggest that the magnetic dipole field strength of the remnants can be much smaller than that of expected when the plateau emission is powered only by spin-down luminosity of magnetars.
摘要：
Currently, most fatigue driving detection methods rely on complex neural networks whose feasibility in hardware implementation needs to be further improved. This paper proposes an embedded device-oriented fatigue driving detection method based on a lightweight YOLOv5s. Firstly, a YOLOv5s face detection network with a parametric-free attention mechanism is designed to enhance the focus on face regions during face detection. Then, a practical facial landmark detector model is improved by integrating multi-scale feature fusion with Ghost module, which can adapt to the variations brought by different scale targets. Next, a fatigue determination approach is investigated by using multiple features of the face. Finally, experiments of the proposed detection model with the public YawDD dataset are implemented on the PC platform and the embedded device, respectively. The experimental results demonstrate that the proposed method achieves a detection accuracy of 95.3% and a processing speed of 22FPS on the PC platform. Meanwhile, the hardware test on an Orange Pi5 embedded device achieves a detection accuracy of 93.3% and a processing speed of 12FPS, which has good prospects for applications.
摘要：
化石燃料的燃烧导致大气中二氧化碳（CO2）的浓度迅速上升，并引发了严重的能源、环境危机。由可再生电力驱动的电催化CO2还原为增值化学品和燃料是解决当前化石燃料枯竭的一种有效方法。采用“一锅法”制备了磷（P）修饰的高分散性“钴-氮-碳”（Co-N-C/P）催化剂，通过扫描电子显微镜（SEM）、X射线衍射（XRD）、拉曼光谱（Raman）和X射线光电子能谱（XPS）等手段对催化剂的形貌、元素分布、缺陷程度、表面元素价态及配位结构进行了表征，并考察了其在H型电解槽中电催化CO2还原为CO的性能。测试结果表明，所制备的Co-N-C/P催化剂在-0.9 V vs. RHE的外加电位下具有97.0%的CO法拉第效率(FECO),电流密度为4.58 mA/cm~2,并可以进行26 h的稳定性测试。与Co-N-C催化剂相比，P的掺杂更有利于Co原子在碳黑基底上的良好分散，相应的FECO提高了约38.9%,说明P的掺杂有效提高了Co-N-C催化剂的电催化CO2还原为CO的性能。
作者机构：
[Wang, Rigao; Shuang, Feng; Wang, RG; Shuang, F] Guangxi Univ, Sch Elect Engn, Nanning 530004, Peoples R China.;[Wang, Rigao; Shuang, Feng; Wang, RG; Shuang, F] Guangxi Univ, Guangxi Key Lab Intelligent Control & Maintenance, Nanning 530004, Peoples R China.;[Lu, Wanyu] China Tobacco Guangxi Ind Co Ltd, Nanning 530011, Peoples R China.;[She, Duan] Henan Acad Sci, Inst Phys, Zhengzhou 450046, Peoples R China.;[She, Duan] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.
通讯机构：
[Wang, RG; Shuang, F ] G;Guangxi Univ, Sch Elect Engn, Nanning 530004, Peoples R China.;Guangxi Univ, Guangxi Key Lab Intelligent Control & Maintenance, Nanning 530004, Peoples R China.
关键词：
density functional theory (DFT);giant magnetoresistance (GMR);rectification ratio (RR);spin-filtering efficiencies (SFEs);zigzag graphene nanoribbons (ZGNRs)
摘要：
Employing the constructs of density functional theory (DFT) and the Nonequilibrium Green's Function (NEGF), the investigation extensively explores the electronic and transport properties of zigzag graphene nanoribbons (ZGNRs) doped with vanadium (V). Notably, this inquiry unveils that strategic doping can transform V-doped ZGNRs into spintronic nanodevices with distinctive transport attributes. Initially, the simulations showcase remarkably high spin-filtering efficiencies (SFEs) at certain bias voltages. Furthermore, a giant magnetoresistance (GMR) peaking at 6.87 x$\times$ 103$<^>3$ is detected. In conclusion, the examination discerns a spin rectifier that exhibits a significant rectification ratio (RR) of 9.62 x$\times$ 102$<^>2$. This research delineates a viable trajectory for the refinement of high-performance spintronics in ZGNRs via vanadium doping. The implications of this study indicate that the model harbors considerable promise for application in miniature spintronic devices. Four models of vanadium-doped zigzag graphene nanoribbons (ZGNRs) with different spacings of vanadium atoms: 2d$d$, d$d$, d/2$d/2$, and a zigzag pattern (ZZP) are explored. Only the d$d$-V-ZGNRs show metallic behavior for spin-up electrons. Using DFT and NEGF, it is found that high spin-filtering efficiencies, giant magnetoresistance, and significant spin rectification make these models promising for spintronic devices. image
作者机构：
[Sheng, Xin-Li; Sheng, XL] INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.;[Sheng, Xin-Li] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Oliva, Lucia] Univ Catania, Dept Phys & Astron Ettore Majorana, Via S Sofia 64, I-95123 Catania, Italy.;[Oliva, Lucia] INFN, Sez Catania, Via S Sofia 64, I-95123 Catania, Italy.
通讯机构：
[Sheng, XL ] I;INFN Firenze, Via Giovanni Sansone 1, I-50019 Sesto Fiorentino, FI, Italy.
摘要：
We propose a relativistic theory for spin density matrices of vector mesons based on Kadanoff-Baym equations in the closed-time-path formalism. The theory puts the calculation of spin observables such as the spin density matrix element rho 00 for vector mesons on a solid ground. Within the theory we formulate rho 00 for phi mesons into a factorization form in separation of momentum and spacetime variables. We argue that the main contribution to rho 00 at lower energies should be from the phi fields that can polarize the strange quark and antiquark in the same way as electromagnetic fields. The key observation is that there is correlation inside the phi meson wave function between the phi field that polarizes the strange quark and that polarizes the strange antiquark. This is reflected by the fact that the contributions to rho 00 are all in squares of fields that are nonvanishing even if the fields may strongly fluctuate in spacetime. The fluctuation of strong force fields can be extracted from rho 00 of unflavored vector mesons as links to fundamental properties of quantum chromodynamics.
作者：
Khan, A. M.;Ashraf, M. U.;Alfanda, H. M.;Aslam, M. Uzair
期刊：
EUROPEAN PHYSICAL JOURNAL A,2024年60(10):1-9 ISSN：1434-6001
通讯作者：
Ashraf, MU
作者机构：
[Khan, A. M.] Univ Sci & Technol China, Hefei 230026, Peoples R China.;[Ashraf, M. U.] Wayne State Univ, Dept Phys & Astron, 666 W Hancock, Detroit, MI 48201 USA.;[Alfanda, H. M.] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;[Alfanda, H. M.] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Aslam, M. Uzair] Pakistan Inst Nucl Sci & Technol, Islamabad 44000, Pakistan.
通讯机构：
[Ashraf, MU ] W;Wayne State Univ, Dept Phys & Astron, 666 W Hancock, Detroit, MI 48201 USA.
摘要：
The Large Hadron Collider (LHC) aims to inject oxygen (16O) ions in the next run into its experiments. This include the anticipated one-day physics run focusing on
$${O+O}\,$$
collisions at center-of-mass energy
$$\sqrt{s_{\textrm{NN}}}=7$$
TeV . In this study, we have used recently developed version of the EPOS (EPOS4) to study the production of identified particles (
$$\pi ^\pm $$
,
$$K^\pm $$
and
$$p({\overline{p}})$$
) in
$${O+O}\,$$
collisions at
$$\sqrt{s_{\textrm{NN}}}=7$$
TeV . Predictions of transverse momentum (
$${p_{\textrm{T}}}\,$$
) spectra,
$${\langle p_{\textrm{T}} \rangle }\,$$
, integrated yield (
$${{\mathrm d}N{/}{\mathrm d}{\textit{y}}}\,$$
) for different centrality classes are studied. To provide insight into the collective nature of the produced particles, we look into the
$${p_{\textrm{T}}}\,$$
-differential particle ratios (
$$K/\pi $$
and
$$p/\pi $$
) and
$${p_{\textrm{T}}}\,$$
-integrated particle ratios to (
$$\pi ^++\pi ^-$$
) as a function of charge particle multiplicity. The shape of the charge particle multiplicity (
$${\textrm{d}N_\textrm{ch}/\textrm{d}\eta }\,$$
) and mean transverse momentum (
$${\langle p_{\textrm{T}} \rangle }\,$$
) is well described by EPOS4. The predictions for the ratios of
$$K/\pi $$
and
$$p/\pi $$
from EPOS4 exhibit a systematic overestimation compared to the trends observed in
$${p+p}\,$$
,
$${p+Pb}\,$$
and
$${Pb+Pb}\,$$
systems as a function of charged-particle multiplicity. Interestingly, the
$${O+O}\,$$
results of
$${p_{\textrm{T}}}\,$$
-integrated particle ratios shows a clear final state multiplicity overlap with
$${p+p}\,$$
,
$${p+Pb}\,$$
and
$${Pb+Pb}\,$$
collisions. EPOS4 does not only mimics signs of collectivity, but embeds collective expansion by construction, since it relies on relativistic hydrodynamics to model the evolution of the so-called core and is one of the suitable candidates to study ultra-relativistic heavy-ion collisions. Furthermore, the foreseen data from
$${O+O}\,$$
collisions at the LHC, when available, will help to better understand the heavy-ion-like behavior in small systems as well as help to put possible constraints on the model parameters.
通讯机构：
[Lin, H ] C;[Liu, Y ] H;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;Hubei Univ, Sch Phys, Dept Phys, Wuhan 430062, Hubei, Peoples R China.
关键词：
exceptional point;non-Hermitian system;three-dimensional metamaterial;equivalent circuit model
摘要：
In recent years, particular physical phenomena enabled by non-Hermitian metamaterial systems have attracted significant research interests. In this paper, a non-Hermitian three-dimensional metamaterial near the exceptional point (EP) is proposed to demonstrate extremely asymmetric absorption and reflection. Unlike its conventional counterparts, this proposed metamaterial is constructed with a loss-assisted design. Localized losses are introduced into the structure by combining our technique of graphene-based resistive inks with conventional printed circuit board process. Extremely asymmetric absorption and reflection near the EP are experimentally observed by tuning the loss between split ring resonators in the meta-atoms. Simultaneously, by linking the equivalent circuit model (ECM) with the quantum model, an equivalent non-Hermitian transmission matrix is constructed. We show that tuning the structure parameters of the ECM produces a metamaterial system with EP response. Our system can be used in the design of unidirectional metamaterial absorbers. Our work contributes to future works on the manipulation of EP to develop precision sensing and other applications in the 3D metamaterial platform.
作者机构：
[Chang, CH; Ho, Chia-An; Chang, Chun-Hao; Yeh, Hung-Chih; Chen, Chao-Yuan; Ho, Chin-Shan] Natl Taiwan Sport Univ, Grad Inst Sports Sci, Taoyuan City, Taiwan.;[Li, Fang] Cent China Normal Univ, Sch Phys Educ, Wuhan, Hubei, Peoples R China.;[Chen, Chao-Yuan] Natl Taipei Univ Business, Sport Off, Taipei City, Taiwan.
通讯机构：
[Chang, CH ] N;Natl Taiwan Sport Univ, Grad Inst Sports Sci, Taoyuan City, Taiwan.
关键词：
adolescent;adult;Article;athlete;athletic performance;body mass;body weight;controlled study;elastography;electromyography;goniometry;human;human experiment;knee function;latissimus dorsi muscle;male;mechanics;muscle contraction;muscle fatigue;muscle mass;muscle rigidity;muscle strength;muscle tone;range of motion;resistance training;vibration sense
摘要：
<jats:sec>
<jats:title>Background</jats:title>
<jats:p>The mechanical properties of muscles, such as changes in muscle tone and stiffness, are related to sports performance and injuries. Rowers are at increased risk of muscle fatigue and injury during high-repetition and heavy-load cyclic muscle actions. In view of this, the aim of the present study was to investigate the acute effect on muscle tone and stiffness, as well as bilateral muscle asymmetry, in high school rowers after a 2000-meter rowing ergometer test.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Methods</jats:title>
<jats:p>Twelve young male rowers (age = 17.1 ± 0.9 years, body weight = 73.5 ± 9.7 kg) were included in the study. The data of muscle tone (frequency) and stiffness of the posterior deltoids (PD), latissimus dorsi (LD), and rectus femoris (RF) (dominant and non-dominant side) before and after a 2000-m rowing ergometer test were collected using a handheld MyotonPRO device.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Results</jats:title>
<jats:p>After the rowing ergometer test, the muscle tone of dominant side PD, LD, and RF were significantly increased (<jats:italic>p</jats:italic> < 0.05). On the other hand, the muscle stiffness of the non-dominant side LD and RF, as well as the dominant side PD, LD, and RF were significantly increased after the rowing ergometer test (<jats:italic>p</jats:italic> < 0.05). The muscle tone and stiffness results showed that the dominant side PD, LD, and RF were all significantly higher than the non-dominant side after the rowing ergometer test (<jats:italic>p</jats:italic> < 0.05), where bilateral PD and RF exhibits moderate asymmetry (5% < symmetry index < 10%).</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Conclusions</jats:title>
<jats:p>After a high-intensity and high-load 2000-m rowing ergometer test, PD, LD, and RF showed increases in muscle tone and stiffness, as well as changes in the symmetry of bilateral muscle mechanical properties.</jats:p>
</jats:sec>
摘要：
In this study, we compute the electromagnetic and hadronic decay widths of the S-wave fully heavy tetraquark T4Q (Q = c or b) at lowest order in alpha s and v, in the framework of nonrelativistic QCD. The short-distance coefficients are determined through the standard procedure of matching. The nonperturbative long-distance matrix elements are related to the phenomenological four-body Schrodinger wave functions at the origin, whose values are taken from literature. The branching fractions are predicted to be around 10-3 and 10-6 for the T4c hadronic decay and electromagnetic decay, respectively. Combining our results with the T4c production cross sections at the LHC, we also predict the event numbers for various decay channels. With integrated luminosity L = 100 fb-1, it is expected that the event numbers can reach 103-104 for T4c -> gamma gamma, and 105-106 for T4c -> LH, at the LHC. The detecting prospect is promising. In addition, the decay widths of T4b are estimated based on simple dimensional analysis as well as velocity scaling rule.
作者机构：
[Mingyue Chen; Wenhui Li; Yu Lu; Pengcheng Qi; Hao Wu; Kunyu Hao; Yiwen Tang] Institute of Nano-Science & Technology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
通讯机构：
[Yiwen Tang] I;Institute of Nano-Science & Technology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China
摘要：
The field of room-temperature corrosion engineering has emerged as a promising avenue for the controlled synthesis of functional nano-materials, owing to its simplicity and potential for scalability. To date, room temperature corrosion engineering has been skillfully applied and successfully used to synthesizee transition metal (oxy)hydroxides. However, the synthesis of transition metal sulfides via room-temperature corrosion encounters challenges due to the low standard electrode potential and sluggish corrosion kinetics of S/Sn2-. Here, we have successfully initiated the oxidation behavior of S22- on Ni3Fe7 foam by adjusting the pH of the aqueous solution (containing (NH4)2SO4 and Na2S2), and subsequently synthesized low-crystallinity (Ni,Fe)xSy nanosheet arrays with significant lattice distortion and amorphous characteristics. Experimental studies combined with theoretical calculations have confirmed Fe within the (Ni,Fe)xSy structure functions as a highly active site while simultaneously expediting the lattice oxygen mechanism, thus yielding a remarkably efficient OER performance.
通讯机构：
[Xue, Q ] C;[Xie, GH ] X;Xiamen Univ, Inst Flexible Elect Future Technol, Xiamen 361005, Peoples R China.;Wuhan Univ, Sauvage Ctr Mol Sci, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China.;Cent China Normal Univ, Dept Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a widely used conductive polymer in organic light-emitting devices. However, its strong acidity and fluorescence quenching effect seriously affect the overall device performance. We report a cost-effective method to address the above concerns by diluting PEDOT:PSS with deionized water, which effectively reduced the film thickness and the acidity. Therefore, the fluorescence quenching occurring at the interface was alleviated. Using the modified PEDOT:PSS as the hole injection layer, the external quantum efficiency of the device could be effectively improved by a factor of 81%, reaching a considerably higher value of 23.5%, compared with the device consisting of the original PEDOT:PSS solution used as received. A cost-effective method to address the issues of strong acidity and exciton quenching of PEDOT:PSS was developed by diluting it with deionized water. The solution-processed organic LEDs achieved almost doubled efficiencies with the modified PEDOT:PSS.
关键词：
Cognitive radio (CR);Consumer electronics;Industries;Internet of Things;NOMA;non-orthogonal multiple access (NOMA);Performance evaluation;Reliability;resilient industry 5.0;Signal to noise ratio;simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)
摘要：
The arrival of the sixth generation (6G) wireless communication will intensify the developments of the Internet of Things (IoT) for widely applications in resilient industry 5.0. Driving the development of the intelligent consumer industry, consumer electronic devices have progressively become indispensable components of the constantly rising IoT. However, the steady rise of consumer IoT intelligent terminals has led to large-scale connections, spectrum scarcity, and energy consumption emerging as crucial challenges for the future wireless communication in resilient industry 5.0. To mitigate the aforementioned issues, a novel simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted cognitive radio (CR)-non-orthogonal multiple access (NOMA) network are proposed. Specifically, we comprehensively elaborate on systems performance in terms of outage probability (OP), ergodic rate (ER) and energy efficiency (EE). Furthermore, the asymptotic OP and ER of the primary and secondary consumer electronic devices under the high signal-to-noise ratio (SNR) regions are investigated to undertake a thorough analysis. We find that the outage and ER performance gradually increase with the transmit SNR, and tend to a fixed value at high SNR regions. In addition, increasing the number of STAR-RIS components will enhance the reliable, ER and EE performance of the considered systems. Finally, the accuracy of analysis and the superiority of the proposed scheme are verified through Monte Carlo simulations.
关键词：
Energy splitting of STAR-RIS;time switching of STAR-RIS;UAV-enabled outdoor-to-indoor WPCN;indoor NFZ
摘要：
This letter investigates a Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface (STAR-RIS)-assisted unmanned aerial vehicle (UAV)-enabled outdoor-to-indoor (O2I) wireless powered communication network (WPCN), in which the UAV avoids flying over the indoor no-fly zone (NFZ). In the downlink energy transfer (DET) stage, the energy-constrained STAR-RIS and the O2I Internet of Things (IoT) devices harvest energy from the radio frequency (RF) signals of the UAV to self-sustain its operation. In the uplink information transmission (UIT) stage, the IoT devices transmit information to the UAV using the harvested energy, assisted by the STAR-RIS. We introduce the STAR-RIS energy splitting (ES) and time switching (TS) operating protocols in the DET and UIT stages, respectively, to maximize the harvested downlink energy and the achievable uplink sum-rate. Further, an alternating optimization (AO) algorithm based on the penalty method and successive convex approximation (SCA) technology is proposed to solve the resulting highly-coupled non-convex optimization problems, in which the UAV trajectory based on the UAV power consumption model, resource allocation of the O2I IoT devices, and beamforming vectors of the STAR-RIS are jointly optimized. Finally, numerical results demonstrate that our proposed scheme can achieve significant system sum-rate gains that are better than other baseline schemes.
作者机构：
[Yan, Xin-Shuai; Yang, Ya-Dong; Chang, Qin; Zhang, Liang-Hui] Henan Normal Univ, Inst Particle & Nucl Phys, Xinxiang 453007, Henan, Peoples R China.;[Yang, Ya-Dong] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Yang, Ya-Dong] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Chang, Q ] H;Henan Normal Univ, Inst Particle & Nucl Phys, Xinxiang 453007, Henan, Peoples R China.
摘要：
Kinematics restricts the ability of rare charm decays to explore the charged lepton-flavor-violation processes mediated by the quark-level c -> ul tau transition. To fill the gap, we propose exploring new physics (NP) through the quasielastic scattering process e-p -> tau- Lambda c and the polarization of the tau lepton. As analyzing modes for the tau polarization, we consider the decays tau- -> pi- nu tau, tau- -> rho- nu tau, and tau- -> l-nu<overline>l nu tau, and show that the tau polarization components can be extracted from analyzing the kinematics of the tau visible decay products. In the framework of a general low-energy effective Lagrangian, we then perform a detailed analysis of the polarization components in various aspects and scrutinize possible NP signals. With one upcoming experimental setup, we finally demonstrate promising event rate can be expected for the cascade process and, even in the worst-case scenario-no signals are observed at all-it can still provide a competitive potential for constraining the NP, compared with those from the high-pT dilepton invariant mass tails at high-energy colliders.
摘要：
The Gas Microchannel plate Pixel Detector (GMPD) is purposefully designed and manufactured for astrophysical X-ray polarization detection, slated for use in various space missions such as the Cosmic X-ray Polarization Detector (CXPD) CubeSat, Low Energy Polarimeter Detector (LPD/POLAR-2), and the Chasing All Transients Constellation Hunters (CATCH). Past research has explored the polarization and spectral performance of GMPD. This study, for the first time, experimentally investigates its imaging characteristics to validate its imaging capabilities. Utilizing a deconvolution method, we measured the position resolution of GMPD, revealing distinctions in the detector's imaging capabilities for X-rays of varying energies and in orthogonal directions. These research findings will provide targeted insights for optimizing the photoelectron track reconstruction algorithm and correcting systematic effects in polarization measurements for future applications of GMPD.
摘要：
Transition metal hydroxides have the advantage of high activity and low cost in alkaline electrolytes and are considered one of the most promising catalysts for anodic oxygen evolution reaction (OER). However, single nickel or iron hydroxides is unstable during the reaction process and have a tendency to agglomerate and poor electrical conductivity. Therefore, we designed a kinetically controlled liquid-phase method to synthesize scalable low-crystalline gamma-FeOOH@Ni(OH)(2) nanosheet arrays on nickle foam (NF) in an open environment. By adjusting the alkalinity and reaction time, we systematically investigated the formation process and the potential mechanisms related to the structural evolution of gamma-FeOOH@Ni(OH)(2) catalysts. gamma-FeOOH@Ni(OH)(2) was used as an OER catalyst and showed excellent hydrolytic activity and stability, with a stable operation of more than 320 h at a large current density of 500 mA cm(-2). Density functional theory calculations show that the synergistic effect of gamma-FeOOH and Ni(OH)(2) increases the charge accumulation near the Fermi energy level, thus increasing the chance of electron transfer and effectively facilitating the decomposition of water molecules. This work provides a new strategy for the design and exploration of catalysts for achieving large-scale industrialized water decomposition for hydrogen production in an open environment.
