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Vibration Analysis of Single-Walled Carbon Nanotubes Embedded in a Polymer Matrix under Magnetic Field Considering the Surface Effect Based on Nonlocal Strain Gradient Elasticity Theory 基于非局部应变梯度弹性理论的单壁碳纳米管嵌入聚合物基体磁场下考虑表面效应的振动分析
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-06-30 DOI: 10.1134/S1029959923030074
N. Moulay, M. Liani, F. Bourada, A. Tounsi, M. H. Ghazwani
{"title":"Vibration Analysis of Single-Walled Carbon Nanotubes Embedded in a Polymer Matrix under Magnetic Field Considering the Surface Effect Based on Nonlocal Strain Gradient Elasticity Theory","authors":"N. Moulay,&nbsp;M. Liani,&nbsp;F. Bourada,&nbsp;A. Tounsi,&nbsp;M. H. Ghazwani","doi":"10.1134/S1029959923030074","DOIUrl":"10.1134/S1029959923030074","url":null,"abstract":"<p>Single-walled carbon nanotubes (SWCNTs) in an elastic medium under a longitudinal magnetic field have piqued the interest of researchers as elements utilized in nanoelectro-magneto-mechanical systems (NEMMS). This work presents the vibration analysis of embedded SWCNTs using the nonlocal second-order strain gradient elasticity theory. Considering the surface effect, the characteristic equation of motion for a SWCNT embedded in a polymer matrix under a longitudinal magnetic field is formulated and derived. The dependence of the distinct natural frequency of SWCNTs on the nanotube chiral angle and diameter is clarified. The effects of various parameters on the vibration characteristics of SWCNTs are examined and discussed, including the longitudinal magnetic field, surface effect, chiral index, chiral angle, chirality of SWCNTs, vibrational mode number, aspect ratio (length-to-diameter ratio), nonlocal and material length scale parameters. The numerical findings of this work might be helpful in the study and implementation of embedded SWCNTs as NEMMS devices.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 3","pages":"329 - 345"},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5159408","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
Bending and Buckling Responses of FGM Nanoplates Embedded in an Elastic Medium FGM纳米板在弹性介质中的弯曲和屈曲响应
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-06-30 DOI: 10.1134/S1029959923030062
R. Bentabet, A. Attia, M. M. Selim, A. Chikh, F. Bourada, A. A. Bousahla, M. H. Ghazwani, A. Tounsi
{"title":"Bending and Buckling Responses of FGM Nanoplates Embedded in an Elastic Medium","authors":"R. Bentabet,&nbsp;A. Attia,&nbsp;M. M. Selim,&nbsp;A. Chikh,&nbsp;F. Bourada,&nbsp;A. A. Bousahla,&nbsp;M. H. Ghazwani,&nbsp;A. Tounsi","doi":"10.1134/S1029959923030062","DOIUrl":"10.1134/S1029959923030062","url":null,"abstract":"<p>This research is devoted to the study of the flexural response and buckling analysis (thermal and mechanical) of functionally graded (FG) nanoscale plates integrated in an elastic medium. The structure is modeled on the basis of a refined integral plate theory with four unknowns incorporated into Eringen’s nonlocal elasticity theory. The material properties of the plate are considered to be graded continuously over the entire thickness of the nanoplate. The elastic medium is simulated like Pasternak’s two-parameter elastic foundations. The equilibrium equations are determined from the principle of virtual displacements. The results for simply supported FG nanoscale plates are deduced and compared with those available in the literature. Parametric studies are carried out to demonstrate the impacts of the inhomogeneity parameter, nonlocal parameter, elastic medium stiffness, and plate geometric ratios on the behavior of FG nanoscale plates.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 3","pages":"313 - 328"},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5151211","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
Simulation of Deformation and Fracture in Polycrystalline Aluminum Alloy under Dynamic Loading 动态载荷作用下多晶铝合金的变形与断裂模拟
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-06-30 DOI: 10.1134/S1029959923030037
R. R. Balokhonov, M. V. Sergeev, V. A. Romanova
{"title":"Simulation of Deformation and Fracture in Polycrystalline Aluminum Alloy under Dynamic Loading","authors":"R. R. Balokhonov,&nbsp;M. V. Sergeev,&nbsp;V. A. Romanova","doi":"10.1134/S1029959923030037","DOIUrl":"10.1134/S1029959923030037","url":null,"abstract":"<p>A numerical study is conducted on the influence of the polycrystalline structure, strain rate, and constrained boundary conditions on the plastic strain localization and fracture of 6061-T6 aluminum alloy under dynamic loading. The investigation is carried out on a three-dimensional polycrystalline structure generated by the step-by-step packing method. The deformation behavior of 6061-T6 aluminum alloy under different strain rates and temperatures is described using a relaxation constitutive equation. The initiation and growth of cracks are taken into account using a strain criterion. The developed models and polycrystalline structure are implemented into the ABAQUS/Explicit finite element package to simulate tension of the aluminum samples. It is shown that taking into account the polycrystalline structure leads to lower values of the macroscopic yield stress in comparison with a homogeneous sample. The strain rate and constrained boundary conditions are shown to affect the crack initiation site and fracture patterns.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 3","pages":"267 - 281"},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5155737","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
Wave Propagation in Functionally-Graded Nanoplates Embedded in a Winkler–Pasternak Foundation with Initial Stress Effect 具有初始应力效应的温克勒-帕斯捷尔纳克地基中功能梯度纳米板的波传播
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-06-30 DOI: 10.1134/S1029959923030049
M. Ellali, M. Bouazza, A. M. Zenkour
{"title":"Wave Propagation in Functionally-Graded Nanoplates Embedded in a Winkler–Pasternak Foundation with Initial Stress Effect","authors":"M. Ellali,&nbsp;M. Bouazza,&nbsp;A. M. Zenkour","doi":"10.1134/S1029959923030049","DOIUrl":"10.1134/S1029959923030049","url":null,"abstract":"<p>This paper presents the analysis of wave propagation in functionally-graded (FG) nanoplates on a Winkler–Pasternak foundation. The investigation is carried out in the framework of nonlocal elasticity theory and a new four-unknown higher-order displacement theory including indeterminate integral terms. Hamilton’s principle and Navier’s method are used to obtain the frequency relations of FG nanoplates for different conditions by solving an eigenvalue problem. The obtained results for the frequency and phase velocity of wave propagation in an FG nanoplate are compared with recent outcomes of similar research.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 3","pages":"282 - 294"},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5155738","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
Simple Quasi-3D and 2D Integral Shear Deformation Theories for Buckling Investigation of Advanced Composite Plates 先进复合材料板屈曲研究的简单准三维和二维积分剪切变形理论
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-06-30 DOI: 10.1134/S1029959923030086
A. Younsi, F. Bourada, A. A. Bousahla, A. Kaci, A. Tounsi, K. H. Benrahou, M. H. Ghazwani
{"title":"Simple Quasi-3D and 2D Integral Shear Deformation Theories for Buckling Investigation of Advanced Composite Plates","authors":"A. Younsi,&nbsp;F. Bourada,&nbsp;A. A. Bousahla,&nbsp;A. Kaci,&nbsp;A. Tounsi,&nbsp;K. H. Benrahou,&nbsp;M. H. Ghazwani","doi":"10.1134/S1029959923030086","DOIUrl":"10.1134/S1029959923030086","url":null,"abstract":"<p>In this paper, both 2D and quasi-3D hyperbolic integral shear deformation theories are employed for buckling analysis of functionally graded (FG) plates. The simplicity of the developed theory is due to the reduced number of the unknowns used in the field of displacement. The proposed model takes into account the effect of both normal and transverse shear deformations and ensures the nullity of transverse shear stresses at the top and bottom surfaces of the studied structure without including any shear correction factors. Properties of the material are microscopically inhomogeneous and change continuously according to a power law model in the <i>z</i> direction. The Navier method is utilized to study the mechanical buckling response of a simply supported FG plate under both uniaxial and biaxial compressive loading. The numerical study is validated by comparing the obtained results with the literature data. The influence of thickness stretching, geometric parameters, material index, and different loading cases on the critical buckling load is examined.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 3","pages":"346 - 366"},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5156798","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
Variational Iteration Method for Prediction of the Pull-In Instability Condition of Micro/Nanoelectromechanical Systems 微纳机电系统拉入不稳定状态预测的变分迭代法
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-06-30 DOI: 10.1134/S1029959923030013
N. Anjum, J.-H. He, C.-H. He, K. A. Gepreel
{"title":"Variational Iteration Method for Prediction of the Pull-In Instability Condition of Micro/Nanoelectromechanical Systems","authors":"N. Anjum,&nbsp;J.-H. He,&nbsp;C.-H. He,&nbsp;K. A. Gepreel","doi":"10.1134/S1029959923030013","DOIUrl":"10.1134/S1029959923030013","url":null,"abstract":"<p>The dynamics of micro/nanoelectromechanical systems (M/NEMS) is a core research area in micromechanics. Due to the nonlinearities and the singular nature of actuation forces that emerge in these systems, it has become a promising and challenging research area. The foremost objective of this manuscript is to examine the dynamics of M/NEMS by approximating rational terms involved in M/NEMS structures. An M/NEMS switch under electromagnetic force is adopted to reveal the effectiveness of the expansion of rational terms. Taylor series is employed to approximate the rational function into the summation of simple terms. The well-known variational iteration method is engaged to obtain the dynamic pull-in threshold value, the nonlinear frequency, and the analytical solution of the objective system. The solution obtained from the proposed strategy exhibits good agreement with observations obtained numerically. As opposed to the existing approaches, the suggested scheme achieves a high level of accuracy.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 3","pages":"241 - 250"},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5156820","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: 3
Thermal Analysis of a Rotating Micropolar Medium Using a Two-Temperature Micropolar Thermoelastic Model with Higher-Order Time Derivatives 基于高阶时间导数的双温度微极热弹性模型的旋转微极介质热分析
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-06-30 DOI: 10.1134/S1029959923030025
A. E. Abouelregal, R. Alanazi, A. H. Sofiyev, H. M. Sedighi
{"title":"Thermal Analysis of a Rotating Micropolar Medium Using a Two-Temperature Micropolar Thermoelastic Model with Higher-Order Time Derivatives","authors":"A. E. Abouelregal,&nbsp;R. Alanazi,&nbsp;A. H. Sofiyev,&nbsp;H. M. Sedighi","doi":"10.1134/S1029959923030025","DOIUrl":"10.1134/S1029959923030025","url":null,"abstract":"<p>In this work, the propagation of planar waves in a homogeneous micropolar thermoelastic medium is studied while the entire body rotates with a uniform angular speed. The coordinate system of the rotating medium is assumed to be stationary, and therefore the kinematic equations have two additional terms, namely, the gravitational and the Coriolis accelerations. The problem is addressed based on the two-temperature thermoelastic model with higher-order time derivatives and dual-phase lag, which can explain the effect of microscopic features in nonsimple materials. With certain boundary conditions and the normal mode approach, the variations in temperature, displacement, microrotation, and thermal stresses induced by heating are derived. In the absence of rotation and two-temperature factor, comparison is made with the results of classical thermoelastic models.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 3","pages":"251 - 266"},"PeriodicalIF":1.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5154723","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
Modeling of Hysteresis in Single-Crystalline Barium Titanate with Allowance for Domain Structure Evolution 考虑畴结构演变的单晶钛酸钡迟滞模型
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-04-19 DOI: 10.1134/S1029959923020066
S. M. Lobanov, A. S. Semenov, A. Mamchic
{"title":"Modeling of Hysteresis in Single-Crystalline Barium Titanate with Allowance for Domain Structure Evolution","authors":"S. M. Lobanov,&nbsp;A. S. Semenov,&nbsp;A. Mamchic","doi":"10.1134/S1029959923020066","DOIUrl":"10.1134/S1029959923020066","url":null,"abstract":"<p>The paper proposes a microstructural model of tetragonal single-crystalline barium titanate for analyzing how the state of its domain structure can influence the simulation accuracy of dielectric hysteresis curves with regard for domain interactions and for stress and electric field inhomogeneities in the single crystal. Hysteresis curves based on finite element homogenization are presented for all eight types of second-rank laminate domain patterns satisfying the compatibility conditions. It is shown that the properties of domain structures are substantially anisotropic under loading in different directions and that the dielectric hysteresis for different domain patterns differs greatly. The proposed model allows one to describe the effects of domain hardening and unloading nonlinearity. The results of calculations using the model agree well with experimental data at different cyclic load amplitudes.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 2","pages":"167 - 175"},"PeriodicalIF":1.6,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4740743","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
Effect of Copper Content on Grain Structure Evolution in Additively Manufactured Ti-6Al-4V Alloy 铜含量对增材制备Ti-6Al-4V合金晶粒组织演变的影响
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-04-19 DOI: 10.1134/S1029959923020017
A. P. Zykova, A. V. Nikolaeva, A. V. Vorontsov, A. V. Chumaevskii, S. Yu. Nikonov, E. N. Moskvichev, D. A. Gurianov, N. L. Savchenko, E. A. Kolubaev, S. Yu. Tarasov
{"title":"Effect of Copper Content on Grain Structure Evolution in Additively Manufactured Ti-6Al-4V Alloy","authors":"A. P. Zykova,&nbsp;A. V. Nikolaeva,&nbsp;A. V. Vorontsov,&nbsp;A. V. Chumaevskii,&nbsp;S. Yu. Nikonov,&nbsp;E. N. Moskvichev,&nbsp;D. A. Gurianov,&nbsp;N. L. Savchenko,&nbsp;E. A. Kolubaev,&nbsp;S. Yu. Tarasov","doi":"10.1134/S1029959923020017","DOIUrl":"10.1134/S1029959923020017","url":null,"abstract":"<p>Electron beam additive manufacturing with simultaneous feeding of two dissimilar metal wires was used to obtain Ti-6Al-4V specimens successively alloyed with 0.6, 1.6, 6.0 and 9.7 wt % Cu. The specimens were characterized for microstructure, phases, and mechanical properties. Increasing the copper content in the alloy from 0.6 to 9.7 wt % resulted in the refinement of primary β-Ti grains and the columnar-to-equiaxed grain transformation owing to the effect of constitutional undercooling on grain nucleation and growth. The grain growth restriction factor was calculated to substantiate the microstructural evolution from columnar to equiaxed grains. Admixing with up to 6.0 wt % Cu resulted in the formation of ultrathin α-Ti platelets, while increasing the copper content to 9.7 wt % Cu led not only to further thinning of α-Ti platelets but also to the formation of refined α′-Ti and α″-Ti phases. Intermetallic Ti<sub>2</sub>Cu particles were precipitated due to the β → Ti<sub>2</sub>Cu + α eutectoid decomposition of primary β-Ti grains and then plausibly induced heterogeneous nucleation of α-Ti platelets. A combined effect of solid solution hardening, precipitation hardening, and grain boundary hardening was achieved and allowed increasing the microhardness, ultimate tensile stress, tensile yield stress, and compression yield stress of Ti-6Al-4V/Сu specimens.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 2","pages":"107 - 125"},"PeriodicalIF":1.6,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4739978","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: 4
Nanohardness and Elastic Modulus of TiNi-TiFe Single and Polycrystals ti - fe单晶和多晶的纳米硬度和弹性模量
IF 1.6 4区 材料科学
Physical Mesomechanics Pub Date : 2023-04-19 DOI: 10.1134/S1029959923020042
S. A. Muslov, A. I. Lotkov
{"title":"Nanohardness and Elastic Modulus of TiNi-TiFe Single and Polycrystals","authors":"S. A. Muslov,&nbsp;A. I. Lotkov","doi":"10.1134/S1029959923020042","DOIUrl":"10.1134/S1029959923020042","url":null,"abstract":"<p>The paper reports on a nanoindentation study of the hardness <i>H</i> and Young’s modulus <i>E</i> in the B2 phase of quasi-binary TiNi-TiFe single crystals and Ti<sub>49</sub>Ni<sub>51</sub> single and polycrystals with and with no thermoelastic martensite transformations. The study shows that the elastic properties of the alloy single crystals depend on the concentration of Fe atoms and decrease gradually with a decrease in the Fe content and with a gradual decrease in the B2-phase stability to martensite transformations. In Ti<sub>50</sub>Ni<sub>50–<i>x</i></sub>Fe<sub><i>x</i></sub>, the dependence of the hardness <i>H</i> on the Fe content reveals a peak at equal Fe and Ni concentrations (25.0 at %), which is likely because the alloy at this Fe/Ni ratio is involved in its maximum solid solution hardening. The experimental results are compared with numerical data obtained by the Voigt averaging of elastic constants, showing a mean deviation of 11.55% between them. An analysis of the <i>H</i> and <i>E</i> correlation and the <i>H</i>/<i>E</i> ratio in the alloys as they lose the B2-phase stability to martensite transformations suggests that the correlation coefficient of <i>E</i> and <i>H</i> in TiNiFe measures 0.42, which corresponds to the range of moderate statistical values. In TiNi-TiFe with martensite transformation, the ratio <i>H</i>/<i>E</i> is higher than 0.035, and hence, higher than the values typical of metals and alloys. In our opinion, this is because the elastic moduli of the alloys are “softened” as they get close in concentration to the points of B2 → R → B19′ transitions. The <i>H</i>/<i>E</i> ratio in the alloys can be considered as a criterion of B2-phase stability loss with respect to martensite transformations.</p>","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"26 2","pages":"152 - 156"},"PeriodicalIF":1.6,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4740736","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
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