Chinese Journal of Physics最新文献

{"title":"Effects of electric fields on signaling in autaptic synapse modified Izhikevich neurons","authors":"Kaijun Wu,&nbsp;Xiangbing Chen ,&nbsp;Jiawei Li ,&nbsp;Zhaoxue Huang","doi":"10.1016/j.cjph.2025.08.001","DOIUrl":"10.1016/j.cjph.2025.08.001","url":null,"abstract":"<div><div>This paper is based on the Izhikevich neuron model and studies the influence of the electric field (EF) on the signal detection ability of the neuron system modified by electro-chemical autapses under chaotic environmental conditions. It was found that chaotic resonance occurs under specific conditions in any self-synaptic neuron model, and multiple chaotic resonances (MCR) were observed in the Izhikevich neuron model regardless of whether or not EF was considered. After the introduction of EF, the system exhibits more intense MCR. In addition, when the synaptic time-delay parameter <span><math><mi>τ</mi></math></span> is an integer multiple of the weak periodic signal period <span><math><mi>T</mi></math></span>, multiple chaotic resonance phenomena occur in the electro and excitatoryautaptic neuron system. It is found that the intensity of the chaotic current required for the optimal signal detection of excitatory chemical synapses under the action of EF is significantly lower than that in the scenario without EF. The analysis of the energy consumption of excitatory chemical synapses shows that EF reduces the response threshold of the system to the chaotic current, enabling the neuron to achieve adequate signal amplification with lower energy input. However, in inhibitory chemical synapses, the neuron model suppresses the weak periodic signal period <span><math><mi>T</mi></math></span> and its multiples, which is more evident in the presence of EF. This is because the blocking effect eliminates the chaotic resonance. Therefore, we hope that the discoveries we’ve made can help to shed light on the behavior of the intricate nervous system under the combined influence of the electric field and autapses in a chaotic setting.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1073-1089"},"PeriodicalIF":4.6,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144879008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Magnetoelectric synergy enabled quad-state memory in Fe3GeTe2/α-In2Se3 dual-ferroic junction","authors":"Huan Wang ,&nbsp;Shan Jiang ,&nbsp;Xiaojie Liu ,&nbsp;Hui Wang ,&nbsp;Haitao Yin","doi":"10.1016/j.cjph.2025.08.003","DOIUrl":"10.1016/j.cjph.2025.08.003","url":null,"abstract":"<div><div>This study demonstrates a dual-ferroic tunnel junction (Fe₃GeTe₂/α-In₂Se₃/Fe₃GeTe₂) composed of a two-dimensional ferroelectric α-In₂Se₃ barrier layer and ferromagnetic Fe₃GeTe₂ (FGT) electrodes. Four distinct nonvolatile resistance states are achieved by synergistically controlling ferroelectric polarization direction (P↑/P↓) and magnetic spin alignment (parallel/antiparallel). Ferroelectric polarization reversal dynamically modulates the interfacial barrier height, establishing a low-resistance channel in the P↑ state via reduced tunneling and Schottky barriers. This mechanism enhances the current by one order of magnitude compared to the P↓ configuration, while achieving near-perfect spin-polarized transport with a spin polarization (SP) exceeding 95 %. Furthermore, the P↓ state exhibits a maximum tunneling magnetoresistance (TMR) of 144 %, whereas the parallel magnetization state demonstrates an exceptional tunneling electroresistance (TER) of 2300 %. These results reveal a synergistic amplification effect arising from ferroelectric-ferromagnetic coupling, advancing the integration of spintronics and multiferroic heterostructures for next-generation memory and logic technologies.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1492-1501"},"PeriodicalIF":4.6,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145018996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Optical pulling forces enhancement through near field and momentum based on the coupling of borophene and metal surface plasmon polariton resonances","authors":"Ping-Ping Zhu,&nbsp;Yue-Dong Li,&nbsp;Yue-Gang Chen","doi":"10.1016/j.cjph.2025.07.035","DOIUrl":"10.1016/j.cjph.2025.07.035","url":null,"abstract":"<div><div>Backward optical pulling force (BOPF) has gained much attention due to flexible optical manipulation compared to forward optical pushing force (FOPF). A multilayer borophene-dielectric-metal structure was designed to enhance electric field intensity and photonic momentum change, achieving the BOPF enhancement on gold nanowires. In the structure, the excitation of borophene plasmon polaritons (BSPs) is a key to improving BOPF. The electric intensity is enhanced by the strong coupling between BSP and cavity resonance modes. The resonances of coupled modes generate radiation, resulting in a longitudinal force <span><math><msub><mi>F</mi><mi>y</mi></msub></math></span>. When the BSPs were excited by oblique incidence light, lateral momentum <span><math><mrow><mi>ℏ</mi><msub><mi>k</mi><mi>x</mi></msub></mrow></math></span> was generated, resulting in a lateral BOPF <span><math><msub><mi>F</mi><mi>x</mi></msub></math></span>. Both the longitudinal force <span><math><msub><mi>F</mi><mi>y</mi></msub></math></span> and lateral force <span><math><msub><mi>F</mi><mi>x</mi></msub></math></span> were enhanced by the strong coupling resonances. Moreover, metal surface plasmon polaritons (MSPPs) were excited by the periodic grating in the structure. When the negative MSPP mode coincides with the BSP modes, the coupling between them is generated through the scattering of the gold nanowire, resulting in a large photonic momentum increment (the sum of the momenta of BSP and MSPP, <span><math><mrow><mi>ℏ</mi><msub><mi>k</mi><mrow><mi>B</mi><mi>S</mi><mi>P</mi></mrow></msub><mrow><mspace></mspace><mo>+</mo><mspace></mspace></mrow><mi>ℏ</mi><msub><mi>k</mi><mrow><mi>M</mi><mi>S</mi><mi>P</mi><mi>P</mi></mrow></msub></mrow></math></span>). Based on the conservation of momentum, the lateral BOPF was enhanced extremely. The switching between lateral FOPF and BOPF is achieved by the exchange between MSPP and BSP. The BOPF enhancement has important applications in light-matter interaction techniques, such as signal processing, particle trapping, and optical tweezers.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 948-960"},"PeriodicalIF":4.6,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144829520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Adsorption properties and sensing capabilities of pristine and Stone–Wales defected BN nanosheets for lung cancer VOC biomarkers: A DFT investigation","authors":"Alaa M. Khudhair ,&nbsp;Hasan Ali Dhahi","doi":"10.1016/j.cjph.2025.07.036","DOIUrl":"10.1016/j.cjph.2025.07.036","url":null,"abstract":"<div><div>Lung cancer (LC) continues to be a predominant cause of global mortality, with early identification being a significant challenge due to the constraints of existing detection technologies, which are frequently invasive, expensive, and inaccessible. This study utilized density functional theory (DFT) to systematically examine the efficacy of both pristine and Stone–Wales (SW) defect-engineered BN nanosheets as selective biosensors for the early detection of LC-associated volatile organic compounds (VOCs): benzene (C₆H₆), isoprene (C₅H₈), and methyl-cyclopentane (C₆H₁₂). Thorough simulations demonstrated that the incorporation of software faults markedly modifies the electrical structure of BN nanosheets, thereby improving their sensitivity and selectivity for the target VOCs. The adsorption energy estimates (E_ads) were consistently negative across all systems, signifying stable and exothermic interactions. The adsorption energies of benzene, isoprene, and methyl-cyclopentane on virgin BN were −0.787 eV, −0.893 eV, and −0.740 eV, respectively; for the BN-SW substrate, the values were −0.770 eV, −0.839 eV, and −0.603 eV, respectively. These findings validate the thermodynamic favorability and strong interaction between the VOCs and the sensor surfaces. The computed global reactivity descriptors and recovery durations further substantiate the efficacy of BN and BN-SW nanosheets for real-time biosensing. This study illustrates that both pristine and defect-engineered BN nanosheets, especially those with Stone–Wales defects, present highly promising platforms for the early detection of lung cancer biomarkers, facilitating the future creation of efficient, non-invasive diagnostic devices.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"98 ","pages":"Pages 46-58"},"PeriodicalIF":4.6,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Entropy generation analysis in unsteady flow of micropolar fluid through anisotropic porous media","authors":"Sneha Jaiswal ,&nbsp;Nitisha Yadav ,&nbsp;Pramod Kumar Yadav ,&nbsp;Bhupesh Dutt Sharma","doi":"10.1016/j.cjph.2025.07.028","DOIUrl":"10.1016/j.cjph.2025.07.028","url":null,"abstract":"<div><div>In this study, the authors have addressed the time-dependent flow of micropolar fluid in a channel filled with an anisotropic porous medium. The novelty of the present investigation lies in using a complex porous medium along with the slip conditions on both geometry boundaries and analysis of entropy generation in the micropolar fluid flow through anisotropic porous media. The non-linearity of the governing equations has been solved by the finite difference method, and the solution obtained is stable and convergent. The numerical solution of the dependent variable has been utilized to determine the variation in the flow profile due to the porous medium’s complex nature, to see the effect of slip boundary conditions, and the effect of non-Newtonian fluid parameters. The variation in the velocity profile and temperature profile with respect to the flow parameters is satisfied with the physics of the flow and the medium. An important conclusion made is that the entropy generation in the flow of micropolar fluid through anisotropic porous media can be reduced by raising the anisotropic angle and anisotropic permeability parameter, which can be utilized for the modeling of heat exchangers, microfluidic devices, thermal management in porous microchannels, porous solar collectors, and many more.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 998-1023"},"PeriodicalIF":4.6,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Minimally deformed wormhole solutions with holographic dark energy and mixed energy density in dRGT gravity","authors":"Sourav Chaudhary ,&nbsp;S.K. Maurya ,&nbsp;Jitendra Kumar","doi":"10.1016/j.cjph.2025.07.029","DOIUrl":"10.1016/j.cjph.2025.07.029","url":null,"abstract":"<div><div>This study explores static, spherically symmetric wormhole solutions within the framework of massive gravity (dRGT) de Rham–Gabadadze–Tolley (dRGT) for the first time, incorporating mixed-energy density and holographic dark energy (DE) density profiles using the Minimal Geometric Deformation (MGD) method proposed by Ovalle (2017). Using unique density profiles, the corresponding shape functions are calculated. The key characteristics of wormholes, including flaring-out condition and asymptotical flatness, are examined in depth. Through the MGD approach, this study constructs wormhole solutions, with the decoupling parameter <span><math><mi>γ</mi></math></span> serving as a key factor influencing their geometry and energy constraints. The embedded diagrams illustrate the upper and lower universes, which are influenced by the effects of newly determined shape functions. In addition, the volume integral quantifier (<span><math><mi>VIQ</mi></math></span>) is evaluated, shedding light on the exotic matter required near the wormhole throat. The stability of the wormhole solution is confirmed by satisfying equilibrium criteria through the balancing of different forces. Both models suggest that real-world wormhole solutions are feasible due to the increasing active gravitational mass (<span><math><mi>AGM</mi></math></span>). Through a detailed analysis of shape functions, the study addresses how thin-shell wormhole stability is influenced by mass, geometric structure, and decoupling parameter, offering practical insights into constructing stable configurations in theoretical models.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1036-1059"},"PeriodicalIF":4.6,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144858240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Path multiplicity in regular ring lattices","authors":"Yu Dong ,&nbsp;Ye Deng ,&nbsp;Yu Xiao ,&nbsp;Jun Wu","doi":"10.1016/j.cjph.2025.07.033","DOIUrl":"10.1016/j.cjph.2025.07.033","url":null,"abstract":"<div><div>Regular ring lattices have attracted significant attention in the complex network field due to their structured connectivity and their role as foundational models for studying network properties like clustering, robustness, and the transition to small-world characteristics. However, path multiplicity, defined as the number of shortest paths connecting pairs of nodes, has been largely overlooked in such networks. Here, we thoroughly discuss the path multiplicity between any node pair, as well as the average across all pairs, within regular ring lattices using analytical and simulation methods. We analytically derive the number of shortest paths between two nodes and analyze the corresponding distribution numerically. Our findings reveal notable variations in the shape and range of the distribution with varying coordinate number <span><math><mi>K</mi></math></span>. We also examine the dependence of the average path multiplicity on <span><math><mi>K</mi></math></span> and network size <span><math><mi>N</mi></math></span>. Our results suggest that, for fixed <span><math><mi>N</mi></math></span>, the average path multiplicity follows a unimodal pattern with intrinsic fluctuations as <span><math><mi>K</mi></math></span> increases, which is well captured by a Gaussian fit. Furthermore, for fixed <span><math><mi>K</mi></math></span>, the average path multiplicity increases exponentially with <span><math><mi>N</mi></math></span>. This study enhances the understanding of path multiplicity in regular ring lattices and has potential applications in the design of fault-tolerant communication networks and distributed algorithms.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 961-968"},"PeriodicalIF":4.6,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144829516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Intelligence modeling of pharmaceutical solubility in supercritical CO2: Polynomial regression, extra trees, and Huber regression models and validation","authors":"Jinwen Liu ,&nbsp;Junsheng Hao ,&nbsp;SuDunabuqi ,&nbsp;Huayang Zhao ,&nbsp;Yongji Li ,&nbsp;Qishisan Wu ,&nbsp;Meirong Bai","doi":"10.1016/j.cjph.2025.07.037","DOIUrl":"10.1016/j.cjph.2025.07.037","url":null,"abstract":"<div><div>This research study investigates the relationship between temperature, pressure, and the properties of Erlotinib hydrochloride drug using a dataset comprising temperature, pressure, SC-CO₂ density, and mole fraction. Indeed, the solubility of medicine in the solvent was investigated via several models. The objective is to predict the density of solvent and the mole fraction of medicine. Three models, namely Extra Trees (ERT), Huber Regression (HBR), and Polynomial Regression (PR) are employed, and Sequential Model-Based Optimization (SMBO) is applied for hyperparameter tuning. Results showed promising outcomes, with Polynomial Regression achieving high accuracy in modeling both SC-CO₂ density and mole fraction. For SC-CO₂ density, Polynomial Regression achieves a significant R² score of 0.9973, RMSE of 8.4072E + 00, MSE of 7.0682E + 01, and MAE of 5.1116E + 00. In terms of mole fraction prediction, Polynomial Regression achieves an R² score of 0.9919, RMSE of 6.3569E-02, MSE of 4.0410E-03, and MAE of 5.7273E-02. The utilization of SMBO further enhances the performance of the models, demonstrating the effectiveness of this optimization technique. These findings have significant implications for understanding and utilizing the properties of SC-CO₂ in diverse scientific and industrial applications.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 1024-1035"},"PeriodicalIF":4.6,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Bit error rate and average capacity of vortex gamma beams propagating in anisotropic non-Kolmogorov atmospheric turbulence with anisotropic tilt angle","authors":"Chao Zhai,&nbsp;Shuaihua Li","doi":"10.1016/j.cjph.2025.07.022","DOIUrl":"10.1016/j.cjph.2025.07.022","url":null,"abstract":"<div><div>In recent years, there has been significant interest in free space optical (FSO) communications, particularly through the use of various vortex beams, due to their ability to offer low bit error rate (BER) and high channel capacity. Current anisotropic non-Kolmogorov (ANK) turbulence models mostly assume that the long axis of turbulence cells is parallel to the ground. Nevertheless, recent experimental findings by Beason et al. and Wang et al. have demonstrated that these turbulence cells can exhibit an anisotropic tilt angle, which means that the long axis of turbulence cells is not always parallel to the ground but instead forms a specific angle with it. This study investigates a new type of vortex beam known as the gamma beam and its application in FSO communications. For the first time, it provides a comprehensive analysis of the average capacity and BER of the orbital angular momentum (OAM) channels for a gamma beam transmission through weak-to-strong ANK atmospheric turbulence with an anisotropic tilt angle. The turbulence cell ellipsoid model is employed, and it is demonstrated that the average capacity of OAM channels initially increases and then declines as the anisotropic tilt angle <span><math><mi>γ</mi></math></span> increases, and the variation in average capacity is symmetric around <span><math><mrow><mi>γ</mi><mo>=</mo><mn>9</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>∘</mo></mrow></msup></mrow></math></span>. Further numerical results indicate that the FSO communication link utilizing the gamma beam can achieve higher channel capacity by selecting a lower OAM topological charge, using a narrower receiver aperture, and optimizing the initial beam waist. These findings are promising for enhancing FSO communication systems that rely on OAM.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 696-705"},"PeriodicalIF":4.6,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144779414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"On symmetry solutions of nonlocal complex coupled dispersionless system using Darboux transformation and artificial neural networks","authors":"Aamir Farooq ,&nbsp;H.W.A. Riaz ,&nbsp;Wen Xiu Ma","doi":"10.1016/j.cjph.2025.07.021","DOIUrl":"10.1016/j.cjph.2025.07.021","url":null,"abstract":"<div><div>The generalized coupled dispersionless equations describe the dynamics of a current-fed string in an external magnetic field. This study introduces a novel methodology leveraging the Darboux transformation to derive analytical solutions for these complex equations. The approach explores symmetry-preserving and non-preserving solutions, further refined using the Levenberg–Marquardt algorithm within a neural network framework. The network underwent thorough validation using relative <span><math><msub><mrow><mi>L</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> errors during training and testing on clean and noisy data. During this validation, thorough tabular and graphical representations validated our analytical results, proving their reliability. We carefully analyzed the solution behaviors using various visualization techniques, such as contours, three-dimensional plots, and corresponding error graphs. This study comprehensively analyzes the system’s dynamics by integrating analytical methods with artificial neural networks, bridging theoretical predictions with empirical validations. The findings offer new insights into wave behavior, stability, and nonlinear interactions within the system, contributing significantly to mathematical physics.</div></div>","PeriodicalId":10340,"journal":{"name":"Chinese Journal of Physics","volume":"97 ","pages":"Pages 933-947"},"PeriodicalIF":4.6,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144829515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}