Mechanics of Time-Dependent Materials最新文献

An investigation on the healing potential of warm mix asphalt binders using linear amplitude sweep test 用线性振幅扫描试验研究温拌沥青粘结剂的愈合势

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-05-20 DOI: 10.1007/s11043-025-09784-x

Sunny Kumar, Deepa Sasidharan, Atanu Behera, Bharath Gottumukkala, Rakesh Kumar

引用次数: 0

Research on creep constitutive model of salt rock based on nonlinear integer-order viscous dashpot 基于非线性整阶粘性阻尼器的盐岩蠕变本构模型研究

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-04-29 DOI: 10.1007/s11043-025-09782-z

Lele Lu, Shiping Huang, Tingjin Liu, Dongjie Xue, Haiyang Yi, Yang Yang, Zhide Wu, Runtong Zhang

{"title":"Research on creep constitutive model of salt rock based on nonlinear integer-order viscous dashpot","authors":"Lele Lu, Shiping Huang, Tingjin Liu, Dongjie Xue, Haiyang Yi, Yang Yang, Zhide Wu, Runtong Zhang","doi":"10.1007/s11043-025-09782-z","DOIUrl":"10.1007/s11043-025-09782-z","url":null,"abstract":"<div><p>Fluctuations in gas pressure within salt cavern storage and the creep behavior of salt rock are key factors influencing the deformation of surrounding rock and the stability of salt caverns. Considering the operational characteristics of salt cavern storage, this study conducted triaxial graded loading creep tests on an impurity-containing salt rock to systematically analyze its creep deformation, strength characteristics, and failure modes under different confining pressures. The findings reveal that as axial stress increases, creep strain gradually becomes the dominant deformation component in an impurity-containing salt rock, while the proportion of instantaneous compressive strain decreases. When axial stress levels are similar, increasing confining pressure reduces both instantaneous compressive and steady-state creep strain rates. Under similar deviatoric stress conditions, a higher confining pressure leads to varying degrees of increase in instantaneous elastic strain, creep strain, and total strain of an impurity-containing salt rock. Under different confining pressures, the evolution of the steady-state creep strain rate and the viscosity coefficient follows an inverse function relationship. Based on the creep characteristics of salt rock and the geometric features of creep models in the nonaccelerated creep stage, a nonlinear integer-order viscous dashpot is proposed to describe the strain surge in the accelerated creep stage. A nonlinear viscoelastic-plastic creep model capable of capturing the entire creep process of salt rock is developed and further extended to a three-dimensional stress state. Comparative analysis demonstrates that the proposed creep model effectively describes the full creep process of different types of salt rock, particularly the accelerated creep stage.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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The influence of organic additives phthalic anhydride and phthalic acid on the temperature–time dependencies of the electrical strength of HPPE films 有机添加剂邻苯二酸酐和邻苯二酸对HPPE薄膜电强度温度-时间依赖性的影响

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-04-16 DOI: 10.1007/s11043-025-09780-1

Matanat Ahmed Mehrabova, Surayya Isa Mammadova, Sevinj Ittifag Safarova, Farhad Shamil Kerimov, Shafiqa Mohammad Mehdiyeva

{"title":"The influence of organic additives phthalic anhydride and phthalic acid on the temperature–time dependencies of the electrical strength of HPPE films","authors":"Matanat Ahmed Mehrabova, Surayya Isa Mammadova, Sevinj Ittifag Safarova, Farhad Shamil Kerimov, Shafiqa Mohammad Mehdiyeva","doi":"10.1007/s11043-025-09780-1","DOIUrl":"10.1007/s11043-025-09780-1","url":null,"abstract":"<div><p>In this paper, an investigation was conducted on the temperature–time dependence of the electrical durability of high-pressure polyethylene (HPPE) films. The role of organic additives, phthalic anhydride and phthalic acid, was identified. The additive content in HPPE compositions was adjusted with a range from 0.01 to 0.1 mass percent. Results show that incorporating appropriate amounts of these additives increases the electrical strength of HPPE films by approximately 50% compared to unmodified HPPE. Measurements were also conducted on the electrical strength of HPPE films and their modified compositions under varying mechanical stress levels. The activation energy of electrical breakdown (<span>(U)</span>) and its intrinsic value (<span>(U_{0})</span>) remained consistent across both unmodified HPPE and its optimally modified forms. However, modifications with phthalic anhydride and phthalic acid altered the structure-sensitive coefficient (<span>(beta )</span>), reflecting changes in HPPE properties. The value of <span>(U_{0})</span> aligns with the activation energy of chemical bonds, indicating that electrical breakdown in these polymers primarily occurs through bond disruption.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The virtual fields method for identifying viscoelastic properties based on stress-sensitivity virtual fields 基于应力敏感虚拟场的粘弹性特性识别虚拟场方法

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-04-16 DOI: 10.1007/s11043-025-09781-0

D. Sun, S. Taguchi, I. Niki, K. Iizuka, S. Yoneyama

{"title":"The virtual fields method for identifying viscoelastic properties based on stress-sensitivity virtual fields","authors":"D. Sun, S. Taguchi, I. Niki, K. Iizuka, S. Yoneyama","doi":"10.1007/s11043-025-09781-0","DOIUrl":"10.1007/s11043-025-09781-0","url":null,"abstract":"<div><p>An inverse analysis technique is proposed for identifying characteristics from experimental data using the virtual fields method with stress-sensitivity-based virtual fields. Two-dimensional digital image correlation is used to obtain the inplane displacement and strain distributions on the specimen surface. To determine the stress distributions under the plane-stress condition, the numerical Laplace transform is used to obtain the through-thickness strain from the inplane strains based on the correspondence principle. Using the virtual displacement fields based on the stress sensitivity, the bulk and shear relaxation moduli, which represent the viscoelastic characteristics, are simultaneously identified. The various stress states generated by the specimen shape and their time variation in a single test and the use of the stress-sensitivity-based virtual fields make it possible to simultaneously determine two independent viscoelastic material properties. Therefore, this method is expected to make a significant contribution to the mechanics of viscoelastic materials.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11043-025-09781-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The influence of fabric structure on the static and dynamic compressional performance of weft-knitted spacer fabrics 织物结构对纬编间隔织物静、动压缩性能的影响

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-04-11 DOI: 10.1007/s11043-025-09778-9

Mohadese Irani Tekmedash, Nazanin Ezazshahabi, Azita Asayesh

{"title":"The influence of fabric structure on the static and dynamic compressional performance of weft-knitted spacer fabrics","authors":"Mohadese Irani Tekmedash, Nazanin Ezazshahabi, Azita Asayesh","doi":"10.1007/s11043-025-09778-9","DOIUrl":"10.1007/s11043-025-09778-9","url":null,"abstract":"<div><p>Spacer fabric is a type of 3D textile characterized by the presence of two distinct fabric layers that are interconnected by spacer yarns. This investigation focused on analyzing the impact of the weft-knitted spacer fabrics’ thickness resulting from different spacer layers’ knit patterns on the compressional behavior of the spacer fabrics designed specifically for shoe soles. In this regard, the static and dynamic compressional behavior of spacer fabrics was examined according to the simulation carried out for walking. The results obtained from the application of static compressive force on spacer fabrics revealed that by increasing the spacer yarn’s length, the compression and recovery energy, dissipated compression energy, relative compressibility, and thickness recovery of spacer fabrics decreased; in contrast, the surface thickness changes increased. In addition, by examining the results of dynamic compressibility, it was observed that after the first loading cycle, the mechanical properties of spacer fabrics have changed significantly; however, with the increase in the number of loading cycles, the variation rate of these properties has decreased and reached a constant value. Also, with the increase of loading cycles, compressibility, and recovery work, dissipated compression energy and the elastic strain decreased, while the residual strain and ratcheting strain increased. Finally, an analysis of the compressional behavior of weft-knitted spacer fabrics based on viscoelastic models showed that the three-component model with a nonlinear spring can successfully correlate with the experimental results.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143821916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the effect of creep of surrounding rock on the basement uplift of high-speed railway tunnel in diatomite stratum 硅藻土地层中高速铁路隧道围岩蠕变对基底隆升的影响研究

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-04-08 DOI: 10.1007/s11043-025-09777-w

Zhang Huijian, Liu Yongde, Zheng Yuchao, Zhang Lela

{"title":"Study on the effect of creep of surrounding rock on the basement uplift of high-speed railway tunnel in diatomite stratum","authors":"Zhang Huijian, Liu Yongde, Zheng Yuchao, Zhang Lela","doi":"10.1007/s11043-025-09777-w","DOIUrl":"10.1007/s11043-025-09777-w","url":null,"abstract":"<div><p>The objective of this study is to investigate the long-term stability of high-speed rail tunnel basements in diatomite stratum. A series of experiments that included scanning electron microscopy, X-ray diffraction, and creep tests of diatomite were carried out to investigate its microscopic mechanism, chemical composition, and mineral composition. The Burgers model was employed to reveal and describe the creep and deformation characteristics of diatomite. Additionally, the deformation characteristics of the tunnel basement in diatomite stratum under different conditions were investigated using FLAC3D finite-difference software. The results show that different diatomites contain a large number of disc-shaped diatomites and cylindrical diatomites, which are composed of complete diatomites, diatomite fragments, and clay minerals. Under the same load, the creep deformation of white diatomite and blue diatomite with increasing saturation shows the trend of decreasing and then increasing. The deformation of tunnel basement uplift in diatomite stratum with the increase of time under different conditions exhibits a law of change characterized by a rapid rise, attenuation, and subsequent tendency towards stability. The long-term deformation of the stratum 1 m under the tunnel basement and below the center of the tunnel basement (up to the model boundary) is in the order of high saturation > low saturation > saturation, white diatomite > blue diatomite, and full coverage > semi-full coverage > under coverage. The research results can be an important reference for the geotechnical stability research of diatomite affected by the creep effect.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hall and ion-slip effects on MHD flow of a Casson fluid past an impulsively rotating vertical porous plate with a ramped wall temperature and surface concentration 霍尔效应和离子滑移效应对卡森流体通过具有倾斜壁温和表面浓度的脉冲旋转垂直多孔板的MHD流动的影响

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-04-08 DOI: 10.1007/s11043-025-09779-8

M. Veera Krishna, B. V. Swarnalathamma

{"title":"Hall and ion-slip effects on MHD flow of a Casson fluid past an impulsively rotating vertical porous plate with a ramped wall temperature and surface concentration","authors":"M. Veera Krishna, B. V. Swarnalathamma","doi":"10.1007/s11043-025-09779-8","DOIUrl":"10.1007/s11043-025-09779-8","url":null,"abstract":"<div><p>This study investigates the flow behavior of a Casson fluid under specific conditions relevant to engineering, astrophysics, and biofluid mechanics. Blood, which exhibits Casson-fluid properties, interacts with magnetohydrodynamics (MHD), and understanding this behavior can aid in designing medical devices such as blood pumps and diagnostic tools for conditions like hypertension. The research examines the unsteady MHD free-convective rotational flow of an incompressible, electrically conducting Casson fluid over an impulsively moving, infinite, vertical porous plate. The study incorporates a ramped wall temperature and mass concentration while considering the effects of Hall current and ion slip. A uniform magnetic field is applied perpendicular to the flow direction, assuming a low magnetic Reynolds number, which renders the induced magnetic field negligible. The Rosseland approximation is used to model radiative-heat transfer in the energy equation. Analytical solutions to the governing equations are obtained using the Laplace-transform method. The influence of key parameters on velocity, temperature, and mass-concentration distributions is investigated through graphical representations. Additionally, shear stress, heat-transfer rates, and mass-transport rates are examined using tabulated data. Results indicate that Hall current and ion slip enhance the resultant fluid velocity. Significant differences in velocity profiles are observed between ramped and isothermal boundary conditions. Furthermore, this study has implications for thermal management in spacecraft components and industrial applications involving Casson fluids, such as molten plastics and polymers. The findings also provide insights into extrusion and molding processes under varying conditions.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative study of the simulation effectiveness of the polymer’s viscoplastic response between a viscoplastic and a fractional viscoelastic model 粘塑性模型与分数粘弹性模型对聚合物粘塑性响应模拟效果的比较研究

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-03-27 DOI: 10.1007/s11043-025-09775-y

Evagelia Kontou

{"title":"Comparative study of the simulation effectiveness of the polymer’s viscoplastic response between a viscoplastic and a fractional viscoelastic model","authors":"Evagelia Kontou","doi":"10.1007/s11043-025-09775-y","DOIUrl":"10.1007/s11043-025-09775-y","url":null,"abstract":"<div><p>The scope of the present work is to study, experimentally and theoretically, the temperature and strain rate effect on the yielding and postyielding tensile behavior of an epoxy resin. Regarding the theoretical study, a three-dimensional viscoplastic model, namely a Zener B model, associated with the decomposition of the total strain into elastic and viscoplastic part was employed. To have an integrated aspect regarding the various models potentiality, a fractional Zener B viscoelastic model was comparatively utilized. Due to the limited capability of the two well-known models to describe the strain softening, exhibited by the polymeric material, apart from a stress-dependent viscosity related to a nonlinear Eyring-type dashpot, a strain-dependent activation volume was considered to be developed by a distribution function. The strain hardening hereafter was simulated by a back stress, associated with a hyperelastic spring. The strain rate effect could be successfully predicted by the scaling rule valid in viscoelasticity. No essential superior capability simulation was deduced from the comparative study between the two models.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11043-025-09775-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143717043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact performance and energy absorption of sandwich panels with STF-filled honeycomb cores and various skin materials under low-velocity impact conditions 低速冲击条件下stf填充蜂窝芯芯夹层板与各种蒙皮材料的冲击性能及吸能

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-03-24 DOI: 10.1007/s11043-025-09776-x

Sajjad Astaraki, Ehsan Zamani, Mohammad Hossein Pol, Hosein Hasannezhad

{"title":"Impact performance and energy absorption of sandwich panels with STF-filled honeycomb cores and various skin materials under low-velocity impact conditions","authors":"Sajjad Astaraki, Ehsan Zamani, Mohammad Hossein Pol, Hosein Hasannezhad","doi":"10.1007/s11043-025-09776-x","DOIUrl":"10.1007/s11043-025-09776-x","url":null,"abstract":"<div><p>Sandwich panels with honeycomb cores are widely used for structural applications due to their lightweight and impact-resistant properties. However, improving the energy absorption and crashworthiness of these panels remains a significant challenge, particularly when optimizing core materials and skin configurations. This study examines how different core materials, STF-filled honeycomb, water, resin, and semi-rigid foam, affect the impact performance of sandwich panels at low velocities. Additionally, the influence of different skin materials such as aluminum, epoxy-glass composites, and STF-impregnated fabric is analyzed. The panels were fabricated by filling the honeycomb cores with different materials and applying the skins to the cores. Low-velocity impact tests were conducted at drop heights of 100 mm and 500 mm to evaluate energy absorption, mean crushing force, and specific energy absorption. The results demonstrate that STF-filled cores significantly improve energy absorption and impact resistance compared to traditional core materials. Furthermore, STF-impregnated fabric skins enhance overall panel performance, making STF-filled sandwich panels a promising solution for lightweight, high-strength structures in industries such as automotive and aerospace.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of thermoelastic behavior of porous cylinders with voids via a nonlocal space-time elastic approach and Caputo-tempered fractional heat conduction 基于非局域空时弹性方法和卡普托回火分数阶热传导的多孔圆柱体热弹性行为分析

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2025-03-24 DOI: 10.1007/s11043-025-09770-3

Ahmed E. Abouelregal, Ömer Civalek, Bekir Akgöz, Abdelaziz Foul, Sameh S. Askar

{"title":"Analysis of thermoelastic behavior of porous cylinders with voids via a nonlocal space-time elastic approach and Caputo-tempered fractional heat conduction","authors":"Ahmed E. Abouelregal, Ömer Civalek, Bekir Akgöz, Abdelaziz Foul, Sameh S. Askar","doi":"10.1007/s11043-025-09770-3","DOIUrl":"10.1007/s11043-025-09770-3","url":null,"abstract":"<div><p>Previous thermoelastic models have struggled to accurately capture the complex behavior of materials under thermal and mechanical loads, particularly with regard to nonlocal effects and memory-dependent behaviors. To address this limitation, a new model has been developed to study the behavior of porous materials with voids, which are critical in engineering applications such as construction, aerospace, and biomedicine. The proposed model is based on the dual-phase lag theory (DPL), which accounts for delays in thermal responses within porous materials, where multiple phases influence thermal conductivity. A key innovation of this research is the integration of spatial and temporal nonlocal effects, which are essential for understanding microscopic interactions in porous materials. Furthermore, the introduction of Caputo-tempered fractional derivatives enhances the modeling of memory effects, providing a more precise understanding of how previous deformations and thermal exposures influence the behavior of these materials. The model has been validated by analyzing the transient response of a porous cylindrical medium subjected to a laser-shaped thermal flow. The effects of nonlocal interactions, phase delays, and fractional parameters on the thermomechanical responses have subsequently been compared and examined. The findings underscored the pivotal role of nonlocal time-length scale parameters in nanomaterial models, highlighting their influence on the reduction of heat transfer efficiency and the attenuation of thermal stresses.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"29 2","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0