Rheologica Acta最新文献

Rheological assessment of dispersion in electrode slurries using sequence of physical processes (SPP) analysis 利用物理过程序列（SPP）分析对电极浆料中分散体的流变学评价

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-09-25 DOI: 10.1007/s00397-026-01600-8

Hyo-Jeong Lee, Hyun Jeong Choi, Sunhyung Kim, Kyung Hyun Ahn, Jun Dong Park

{"title":"Rheological assessment of dispersion in electrode slurries using sequence of physical processes (SPP) analysis","authors":"Hyo-Jeong Lee, Hyun Jeong Choi, Sunhyung Kim, Kyung Hyun Ahn, Jun Dong Park","doi":"10.1007/s00397-026-01600-8","DOIUrl":"10.1007/s00397-026-01600-8","url":null,"abstract":"<div><p>Particle–polymer mixtures are widely used in industries such as secondary batteries and fuel cells, owing to their enhanced properties derived from complex particle–polymer interactions and microstructures. The dispersion state in the mixtures critically affects processability and product performance yet remains difficult to assess in such complex systems. This study introduces a novel diagnostic approach based on the Sequence of Physical Processes (SPP) methodology under Large Amplitude Oscillatory Shear (LAOS) to characterize dispersion states. Using a model electrode slurry with varying polymeric dispersant concentrations, four distinct dispersion states were identified, each represented by unique patterns on the Cole–Cole plot. Low or excessive dispersant contents produced single deltoid patterns, indicating dominant particle–particle or polymer–polymer interactions. Between these extremes, double deltoid patterns emerged, gradually evolving with increasing amounts of polymeric dispersant. This behavior was ascribed to enhanced dispersion stability resulting from increased polymer content, which reduced particle attraction and suppressed shear-induced aggregation. The interpretation of dispersion state changes based on LAOS-SPP analysis is consistent with the results of microscopy-based cluster analysis and filtration tests. Our results highlight the potential of LAOS-SPP analysis as an efficient tool for diagnosing dispersion quality in complex systems.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 11","pages":"977 - 994"},"PeriodicalIF":2.7,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Upcycling of black cumin seed biomass as an electrorheological active material 黑孜然种子生物质作为电流变活性物质的升级利用

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-09-15 DOI: 10.1007/s00397-026-01598-z

Ozlem Erol, Ece Ozkalan

{"title":"Upcycling of black cumin seed biomass as an electrorheological active material","authors":"Ozlem Erol, Ece Ozkalan","doi":"10.1007/s00397-026-01598-z","DOIUrl":"10.1007/s00397-026-01598-z","url":null,"abstract":"<div><p>In this study, an electrorheological (ER) fluid was developed using black cumin (Nigella sativa L.) seed biomass (BCB) powder as the dispersed phase and polydimethylsiloxane (PDMS) as the dispersing medium. The BCB powder obtained from black cumin seeds by a cold-pressing method was washed with water, dried, and ground-milled before the ER fluid preparation stage. The BCB powder was characterized by structural, thermal, elemental, morphological, and electrical analyses. The steady-state and oscillatory rheological properties of BCB/PDMS (25 wt%) were examined under various externally applied electric field (<i>E</i>) strengths. The yield stress of the BCB/PDMS increased with the <i>E</i> without significant leakage current during the rheological measurements. The yield stress of the BCB/PDMS under 3.5 kV/mm was 225 times greater than that under off-field conditions. The BCB/PDMS exhibited rapid switching and excellent reversibility in rheological behaviors upon application and removal of the <i>E</i>, and good long-term ER performance under repeated on/off square <i>E</i> cycles. The frequency-independent plateau in elastic modulus (≈ 110 kPa at 3.5 kV/mm) over the viscous modulus of BCB/PDMS under the <i>E</i> indicated the formation of a robust, permanent percolation network upon the application of the <i>E</i>. The rheological and dielectric measurements revealed that adsorbed small molecules remaining in the structure after the cold-pressing process played an important role in the interfacial polarization of BCB under <i>E</i>, as evidenced by comparing its dielectric properties with those of Soxhlet-extracted BCB with <i>n</i>-hexane. The BCB powder has been evaluated for a new usage as a sustainable dispersed phase in ER fluids.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 11","pages":"963 - 976"},"PeriodicalIF":2.7,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Viscoelastic characterization of the porcine aorta under combined normal and torsional loadings 猪主动脉在正常和扭转载荷联合作用下的粘弹性特性

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-09-11 DOI: 10.1007/s00397-026-01594-3

Luc Nguyen, Chandler Benjamin

{"title":"Viscoelastic characterization of the porcine aorta under combined normal and torsional loadings","authors":"Luc Nguyen, Chandler Benjamin","doi":"10.1007/s00397-026-01594-3","DOIUrl":"10.1007/s00397-026-01594-3","url":null,"abstract":"<p>Understanding the mechanical properties of aortic tissue is crucial for improving future medical interventions related to cardiovascular diseases. In this study, we seek to experimentally explore the stress relaxation response of the porcine aorta under constant combined torsional shearing and normal compressive load. Circular samples, measuring 0.5 inches in diameter, were extracted from the side wall of excised porcine thoracic aortas. Experiments were performed on a parallel plate rheometer applying a constant compressive strain ranging from 5 to 25% and a constant shear strain ranging from 10 to 50%. The combined loading was maintained for 1000 seconds, and the stress response of the tissue was recorded. A continuum mechanics model describing the combined axial compression and torsional shearing of an incompressible, viscoelastic solid cylinder was developed. Expressions for the normal stress and shear stress on the top surface of the cylinder were derived. A nonlinear least squares method was applied to fit the derived expressions to the rheometer’s corresponding output signals. The solved time scale parameters varied between the normal and shear directions indicating time-dependent anisotropy. Varying the normal compressive strain or the torsional shear strain did not noticeably affect the time scale of the relaxation by significant amounts in either the normal or shear directions. The magnitude of the stress relaxation response in the normal direction shows dramatic dependency on input compressive strain. Varying the input shear strain did not noticeably affect the time scale of the relaxation in either direction, but did modulate the magnitude of the viscous response.</p>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 11","pages":"995 - 1011"},"PeriodicalIF":2.7,"publicationDate":"2026-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-026-01594-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constraint-limited tube orientation theory of entangled polymers in oscillatory shear deformation 纠缠聚合物在振荡剪切变形中的约束限制管取向理论

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-09-09 DOI: 10.1007/s00397-026-01593-4

Dario Nichetti, Alessio Zaccone

{"title":"Constraint-limited tube orientation theory of entangled polymers in oscillatory shear deformation","authors":"Dario Nichetti, Alessio Zaccone","doi":"10.1007/s00397-026-01593-4","DOIUrl":"10.1007/s00397-026-01593-4","url":null,"abstract":"<div><p>We develop a molecularly motivated description of the Nonlinearity Index (NLI) in oscillatory shear deformation of entangled polymers. The central assumption is that the shear component of the tube-orientation tensor possesses a finite geometrical upper bound. Convective constraint release (CCR), chain stretch, and tube dilation progressively reduce the number and lifetime of orientational constraints, while the shear component <span>(S_{xy})</span> of the tube-orientation tensor is geometrically bounded by <span>(S_{xy}le 1/2)</span>. This motivates a constraint-limited orientation closure in which the NLI first grows approximately with strain amplitude and then approaches the limiting value <span>(textrm{NLI}_{max }=3)</span> asymptotically rather than through an artificial cutoff. The same framework yields a molecular expression for the characteristic half-saturation strain <span>(gamma _s)</span>, defined by <span>(textrm{NLI}(gamma _s)=3/2)</span>, in terms of the entanglement number, oscillation frequency, and a critical number of remaining orientational constraints. We further derive architecture-dependent expressions for the nonlinear onset strain <span>(gamma _c)</span> for linear, sparsely long-chain-branched, and more regularly branched polymers. The resulting framework provides a compact bridge between Fourier harmonic analysis, CCR-based tube dynamics, and the progressive loss of orientational memory in highly deformed entangled polymer liquids.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 10","pages":"907 - 920"},"PeriodicalIF":2.7,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of flow-type-dependent matrix rheology on droplet breakup in twin-screw extruded polymer blends 流动型基质流变性对双螺杆挤出聚合物共混物中液滴破碎的影响

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-08-28 DOI: 10.1007/s00397-026-01596-1

Michele Giglio, Gaetano D’Avino, Massimiliano M. Villone, Gianni Marchetti, Pier Luca Maffettone

{"title":"Influence of flow-type-dependent matrix rheology on droplet breakup in twin-screw extruded polymer blends","authors":"Michele Giglio, Gaetano D’Avino, Massimiliano M. Villone, Gianni Marchetti, Pier Luca Maffettone","doi":"10.1007/s00397-026-01596-1","DOIUrl":"10.1007/s00397-026-01596-1","url":null,"abstract":"<div><p>The morphology of immiscible polymer blends generated during twin-screw extrusion depends on the deformation history of the dispersed phase and on the matrix rheology. Here, this effect is investigated numerically in a two-dimensional, co-rotating, fully intermeshing batch twin-screw extruder. A Newtonian dispersed phase is considered, while the matrix is modeled as Newtonian, a Generalized Newtonian Fluid (GNF) accounting for shear thinning, and a Generalized Newtonian Fluid with Flow-Type dependence (GNFFTy), which combines shear thinning in shear-dominated regions and elongational thickening in extension-dominated regions. Velocity-gradient histories along tracer trajectories are used in a morphology model including droplet deformation, breakup, filament stretching, and coalescence. The three rheologies give similar gross flow structures but different local viscosity fields. The GNF model reduces viscosity in high shear regions, whereas GNFFTy predicts localized viscosity enhancement in extensional screw-screw gaps. These differences affect breakup, showing that shear-rate-based morphology predictions may miss topology-dependent viscosity effects.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 11","pages":"921 - 943"},"PeriodicalIF":2.7,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-026-01596-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Insights into the interfacial interactions governing dielectric and electrorheological behavior of halloysite/graphene oxide composite systems 高岭土/氧化石墨烯复合体系介电和电流变行为的界面相互作用研究

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-08-27 DOI: 10.1007/s00397-026-01597-0

Gokce Calis-Ismetoglu, Halil Ibrahim Unal

{"title":"Insights into the interfacial interactions governing dielectric and electrorheological behavior of halloysite/graphene oxide composite systems","authors":"Gokce Calis-Ismetoglu, Halil Ibrahim Unal","doi":"10.1007/s00397-026-01597-0","DOIUrl":"10.1007/s00397-026-01597-0","url":null,"abstract":"<div><p>Electrorheological (ER) fluids are unique systems for investigating the response of dispersed particles in a non-conducting medium to external electric fields. The distribution of charge carriers in the particles under applied electric field, and its effect on the rheological behavior of a dispersion are of great importance in the materials science. In this study, halloysite and graphene oxide composites with primary and secondary interactions; (HNT/GO)<sub>P</sub> and (HNT/GO)<sub>S</sub>, were fabricated to investigate the effect of interaction type between components on the dielectric and ER properties in their silicon oil dispersions. Conductivity measurements showed that primary interactions in the (HNT/GO)<sub>P</sub> composite provide ten times higher conductivity and lower conduction activation energy due to the strong interactions. Additionally, dielectric analysis of dispersions indicated that although the secondary interactions lead to higher polarizability, the primary interactions provide very fast charge accumulation around interfaces. Furthermore, the strength of interparticle interactions significantly affected the ER flow response. As a result, the (HNT/GO)<sub>P</sub>/SO dispersion showed better ER performance under low electric field strengths. Electroactive viscoelastic properties also investigated and similar observations were obtained as better elastic behaviors with (HNT/GO)<sub>P</sub>/SO dispersion. These findings provide information about the relationship between interparticle forces and macroscopic ER properties, offering a useful strategy for designing advanced electroactive vibration damping composite materials.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 11","pages":"945 - 962"},"PeriodicalIF":2.7,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149176866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Yielding and recovery of resistor pastes with different binder content for screen printing 网印用不同粘结剂含量电阻膏的生产和回收

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-08-26 DOI: 10.1007/s00397-026-01595-2

Enxia Guo, Zibin Lv, Jinyu Lv, Hua Na, Bin Han, Bo Xu, Yanhang Wang, He Kun, Chengkui Zu

引用次数: 0

The role of initial temperature on the yield stress of formulated waxy oils 初始温度对配制蜡质油屈服应力的影响

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-08-20 DOI: 10.1007/s00397-026-01591-6

Matheus de Souza Cunha, Diogo E. V. Andrade, Edson José Soares

{"title":"The role of initial temperature on the yield stress of formulated waxy oils","authors":"Matheus de Souza Cunha, Diogo E. V. Andrade, Edson José Soares","doi":"10.1007/s00397-026-01591-6","DOIUrl":"10.1007/s00397-026-01591-6","url":null,"abstract":"<div><p>Waxy oils exhibit complex rheological behavior at low temperatures. This crystallization process, and consequently the resulting morphology and gel strength, is highly sensitive to the thermal history imposed on the material. While previous studies have documented the influence of the initial cooling temperature (<span>(varvec{T_i})</span>) on the gelation of crude oils, this work demonstrates for the first time in the open literature that <span>(varvec{T_i})</span> also significantly affects the rheological response of formulated waxy oils. Morphological analysis shows that increasing <span>(varvec{T_i})</span> leads to a transition from a dense network of numerous small crystals to a sparser structure composed of fewer, larger crystals. To explain this behavior, we propose a hypothesis based on the persistence of subcritical molecular self-assembly precursors in the solution. We suggest that <span>(varvec{T_i})</span> dictates the number density of these precursors, which subsequently act as nucleation sites, thereby defining the connectivity and mechanical strength of the wax crystal network.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 10","pages":"867 - 877"},"PeriodicalIF":2.7,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-026-01591-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-local physics-informed neural networks for forward and inverse solutions of granular flows 颗粒流正反解的非局部物理信息神经网络

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-08-17 DOI: 10.1007/s00397-026-01592-5

Saghar Zolfaghari, Ken Kamrin, Safa Jamali

{"title":"Non-local physics-informed neural networks for forward and inverse solutions of granular flows","authors":"Saghar Zolfaghari, Ken Kamrin, Safa Jamali","doi":"10.1007/s00397-026-01592-5","DOIUrl":"10.1007/s00397-026-01592-5","url":null,"abstract":"<div><p>Dense granular flows exhibit nonlocal effects due to stress transmission in microplastic events, especially in quasi-static or slowly sheared regions. Hence, traditional local rheological models fail to capture spatial cooperativity effects that are prominent in many granular systems. The nonlocal granular fluidity (NGF) model addresses this limitation by introducing a diffusive-like partial differential equation for a fluidity field, governed by a key material-dependent parameter: the nonlocal amplitude <i>A</i>. However, determining <i>A</i> from experiments or simulations is known to be difficult and typically requires extensive calibration across multiple geometries. In this work, we present a data-driven platform based on Physics-Informed Neural Networks (PINNs) embedded with the NGF model, capable of solving granular flows in a forward or inverse manner. We show that once trained on transient flow fields, these non-local PINNs can readily infer the material parameters, as well as the pressure and stress fields. These data-driven frameworks allow for accurate recovery of small variations in the nonlocal amplitude, <i>A</i>, which lead to sharp bifurcation-like transitions in the flow field. This approach demonstrates the feasibility of data-driven parameter inference in complex nonlocal models and opens up new possibilities for characterizing granular materials from sparse experimental observations.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 10","pages":"893 - 906"},"PeriodicalIF":2.7,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-026-01592-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rheology of cereal and pulse batters: soft particle suspension approach 谷物和脉冲面糊的流变学：软颗粒悬浮方法

IF 2.7 3区工程技术

Rheologica Acta Pub Date : 2026-08-08 DOI: 10.1007/s00397-026-01589-0

Chirasmita Panigrahi, Abhijit P. Deshpande, Madivala G. Basavaraj

{"title":"Rheology of cereal and pulse batters: soft particle suspension approach","authors":"Chirasmita Panigrahi, Abhijit P. Deshpande, Madivala G. Basavaraj","doi":"10.1007/s00397-026-01589-0","DOIUrl":"10.1007/s00397-026-01589-0","url":null,"abstract":"<div><p>This study examines the rheology of two cereal- and pulse-based batter suspensions with differing nutritional profiles. These batters, composed of soft-deformable particles, show distinct flow behaviour compared to well-studied hard-particle dispersions. We explore the effects of particle size, concentration, and temperature on their rheology. Both batters exhibit stress–strain and viscosity–concentration responses consistent with the Berli-Quemada (BQ) model. Yield stress obtained from BQ model fit is found to be prominent for suspensions of concentration higher than 20% w/v. Shear rate greatly influences packing of particles, except at high concentration (> 45% w/v). A shear stress equivalent approach, using shift factors, enables construction of a master curve describing flow behaviour at high concentrations. Deviations from the Cox–Merz rule, attributed to interparticle hydrodynamic effects, are addressed with a correction factor linking steady and oscillatory shear data. A power-law exponent (<i>n</i> < 0.2) from modulus–frequency analysis indicates soft gel-like characteristics. Temperature ramp tests show strong dependence of storage and loss moduli on applied strain, revealing physicochemical transitions, such as, protein denaturation, starch gelatinization, starch network disruption, evaporation and caramelization. Subtle differences in particle softness, network formation, packing, and yielding behaviour distinguish the two batters. These findings enhance understanding and modelling of complex food suspensions.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"65 10","pages":"849 - 866"},"PeriodicalIF":2.7,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148981362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0