Pub Date : 2024-01-08DOI: 10.1142/s0217984924501690
M. R. Samadi, Ebrahim Zeynali, Fatemeh Allahyari, Ehsan Salahshorrad, Karim Zangeneh-Madar, Mahmoud Afshari
The main purpose of this work is to optimize the mechanical properties of tungsten–copper (W–Cu) nanocomposite fabricated by the sintering process. For this purpose, the parameters of sintering temperature, sintering time and weight percentage of copper were selected to optimize the compression strength, impact strength, hardness and corrosion resistance of the W–Cu nanocomposite using the desirability function procedure and response surface method. The analyses of transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were also performed to examine the microstructure of W–Cu nanocomposite. The results exhibited that a rise in the sintering temperature from 1000∘C to 1150∘C significantly enhanced the impact strength of W–Cu nanocomposite, while a rise in the sintering temperature from 1150∘C to 1300∘C deteriorated the impact strength. Moreover, the compression strength and hardness of the W–Cu nanocomposite continuously improved by elevation of sintering temperature from 1000∘C to 1300∘C. A rise in the amount of Cu from 20[Formula: see text]wt.% to 40[Formula: see text]wt.% led to a reduction in the hardness of the W–Cu nanocomposite, while a rise of Cu content improved the impact and compression strengths. The results also indicated that the mechanical properties of W–Cu nanocomposite enhanced simultaneously by using 27[Formula: see text]wt.% Cu at sintering temperature of 1197∘C and sintering time of 2.7[Formula: see text]h. The samples sintered at the optimal conditions indicated a higher corrosion resistance than that sintered at the initial conditions.
{"title":"Optimizing the sintering process parameters for simultaneous improvement of the compression strength, impact strength, hardness and corrosion resistance of W–Cu nanocomposite","authors":"M. R. Samadi, Ebrahim Zeynali, Fatemeh Allahyari, Ehsan Salahshorrad, Karim Zangeneh-Madar, Mahmoud Afshari","doi":"10.1142/s0217984924501690","DOIUrl":"https://doi.org/10.1142/s0217984924501690","url":null,"abstract":"The main purpose of this work is to optimize the mechanical properties of tungsten–copper (W–Cu) nanocomposite fabricated by the sintering process. For this purpose, the parameters of sintering temperature, sintering time and weight percentage of copper were selected to optimize the compression strength, impact strength, hardness and corrosion resistance of the W–Cu nanocomposite using the desirability function procedure and response surface method. The analyses of transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were also performed to examine the microstructure of W–Cu nanocomposite. The results exhibited that a rise in the sintering temperature from 1000∘C to 1150∘C significantly enhanced the impact strength of W–Cu nanocomposite, while a rise in the sintering temperature from 1150∘C to 1300∘C deteriorated the impact strength. Moreover, the compression strength and hardness of the W–Cu nanocomposite continuously improved by elevation of sintering temperature from 1000∘C to 1300∘C. A rise in the amount of Cu from 20[Formula: see text]wt.% to 40[Formula: see text]wt.% led to a reduction in the hardness of the W–Cu nanocomposite, while a rise of Cu content improved the impact and compression strengths. The results also indicated that the mechanical properties of W–Cu nanocomposite enhanced simultaneously by using 27[Formula: see text]wt.% Cu at sintering temperature of 1197∘C and sintering time of 2.7[Formula: see text]h. The samples sintered at the optimal conditions indicated a higher corrosion resistance than that sintered at the initial conditions.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"20 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139446104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-30DOI: 10.1142/s0217984924501598
J. Zhao, Guili Liu, Lin Wei, G. Jiao, Yuling Chen, Zhonghua Yang, Guoying Zhang
The lack of a bandgap in stanene severely limits its outstanding characteristics in optoelectronic devices. Using first-principles calculations, we systematically investigate the effects of full hydrogenation and shear deformation on the electronic structure and optical properties of stanene. Hydrogenation exerts a remarkable impact on electronic structure of stanene, enabling surface state transition from quasi-metallic to semiconducting. Shear degrades the structural stability of full-hydrogenated stanene (FHstanene). FHstanene exhibits a tunable bandgap of 1.327[Formula: see text]eV, which can be further reduced to 0.719[Formula: see text]eV through shear deformation. The presence of spin-orbit coupling (SOC) induces band splitting in FHstanene. The maximum optical absorption of FHstanene occurs at 291[Formula: see text]nm, while the reflectance peak is observed at 449[Formula: see text]nm. The variation in bandgap due to deformation results in a redshift in the absorption coefficient and reflectance, and shear deformation increases the reflectance of FHstanene. These findings broaden the application prospects of stanene in novel nano-optoelectronic devices.
{"title":"Density functional theory study on the electronic and optical properties of full-hydrogenated stanene","authors":"J. Zhao, Guili Liu, Lin Wei, G. Jiao, Yuling Chen, Zhonghua Yang, Guoying Zhang","doi":"10.1142/s0217984924501598","DOIUrl":"https://doi.org/10.1142/s0217984924501598","url":null,"abstract":"The lack of a bandgap in stanene severely limits its outstanding characteristics in optoelectronic devices. Using first-principles calculations, we systematically investigate the effects of full hydrogenation and shear deformation on the electronic structure and optical properties of stanene. Hydrogenation exerts a remarkable impact on electronic structure of stanene, enabling surface state transition from quasi-metallic to semiconducting. Shear degrades the structural stability of full-hydrogenated stanene (FHstanene). FHstanene exhibits a tunable bandgap of 1.327[Formula: see text]eV, which can be further reduced to 0.719[Formula: see text]eV through shear deformation. The presence of spin-orbit coupling (SOC) induces band splitting in FHstanene. The maximum optical absorption of FHstanene occurs at 291[Formula: see text]nm, while the reflectance peak is observed at 449[Formula: see text]nm. The variation in bandgap due to deformation results in a redshift in the absorption coefficient and reflectance, and shear deformation increases the reflectance of FHstanene. These findings broaden the application prospects of stanene in novel nano-optoelectronic devices.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":" 18","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139141508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-30DOI: 10.1142/s0217984924501586
A. Asghar, T. Y. Ying, Muhammad Javed Iqbal, Liaqat Ali
This study emphasizes the dual exposition of the impact of convective condition and the significant effects of magnetic field, heat source and velocity slip on hybrid nanofluid flow over the exponentially shrinking sheet. The hybrid nanofluid is regarded as a contemporary variety of nanofluid; consequently, it is utilized to enhance the efficiency of heat transfer. By applying the Tiwari–Das model, the key objective of the current research is to investigate the impact of involving factors Biot number, Eckert number, volume fraction, magnetohydrodynamic (MHD), slip and suction on the temperature and velocity profiles. In addition, the Nusselt number and skin friction variations have been explored against the suction effect on the solid volume fraction of copper [Formula: see text] [1–3%] and the Biot number [Formula: see text] [1–3%]. The nonlinear partial differential equations are converted to a set of an ordinary differential equations by incorporating exponential similarity vectors. Eventually, ordinary differential equations are rectified utilizing MATLAB bvp4c solver. The results demonstrate the presence of dual exposition for suction with varying values of copper volume fraction and the Biot number. The heat transmission rate is observed to escalate in both cases as the strength of the Biot and Eckert numbers intensifies in the range of 1–3%. In summary, the results show that duality and non-unique solutions occur in the aiding flow situation when the suction [Formula: see text], while there is no flow and unique solutions of hybrid nanofluid feasible when [Formula: see text].
{"title":"Thermal characterization of hybrid nanofluid with impact of convective boundary layer flow and Joule heating law: Dual solutions case study","authors":"A. Asghar, T. Y. Ying, Muhammad Javed Iqbal, Liaqat Ali","doi":"10.1142/s0217984924501586","DOIUrl":"https://doi.org/10.1142/s0217984924501586","url":null,"abstract":"This study emphasizes the dual exposition of the impact of convective condition and the significant effects of magnetic field, heat source and velocity slip on hybrid nanofluid flow over the exponentially shrinking sheet. The hybrid nanofluid is regarded as a contemporary variety of nanofluid; consequently, it is utilized to enhance the efficiency of heat transfer. By applying the Tiwari–Das model, the key objective of the current research is to investigate the impact of involving factors Biot number, Eckert number, volume fraction, magnetohydrodynamic (MHD), slip and suction on the temperature and velocity profiles. In addition, the Nusselt number and skin friction variations have been explored against the suction effect on the solid volume fraction of copper [Formula: see text] [1–3%] and the Biot number [Formula: see text] [1–3%]. The nonlinear partial differential equations are converted to a set of an ordinary differential equations by incorporating exponential similarity vectors. Eventually, ordinary differential equations are rectified utilizing MATLAB bvp4c solver. The results demonstrate the presence of dual exposition for suction with varying values of copper volume fraction and the Biot number. The heat transmission rate is observed to escalate in both cases as the strength of the Biot and Eckert numbers intensifies in the range of 1–3%. In summary, the results show that duality and non-unique solutions occur in the aiding flow situation when the suction [Formula: see text], while there is no flow and unique solutions of hybrid nanofluid feasible when [Formula: see text].","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":" 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139137480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-30DOI: 10.1142/s0217984924501483
Lin Ding, Lunxiao Xie, Juan Wen, Minsheng Tan
The robustness of complex networks to various kinds of attacks that could trigger cascading failures has attracted increasing attention. Most existing studies fail to consider that the cost to attack each network component (node or edge) may be unequal. Therefore, in this paper, we explore the network robustness to cascaded attacks based on heterogeneous costs. We introduce an attack cost model with both cost-sensitive and budget-constraint parameters. On this basis, three attack strategies are considered, including hub strategy, average degree strategy, and leaf strategy. Their cascaded attack effects are compared by considering the load local preferential redistribution rule. Both the fraction of failed nodes and the value of a new robustness metric, i.e. the budget-constraint threshold, are monitored in different complex networks. Numerical experiments indicate that as the attack cost changes from homogeneity to heterogeneity, the performance of the classic hub strategy decreases gradually. For the situation of weak heterogeneity of attack cost of each node, leaf strategy achieves the maximum attack performance gradually. Moreover, the budget, network structure, and robustness metrics may all affect the selection of the optimal attack strategy.
{"title":"Robustness of complex networks under cost-constrained cascaded attack strategies","authors":"Lin Ding, Lunxiao Xie, Juan Wen, Minsheng Tan","doi":"10.1142/s0217984924501483","DOIUrl":"https://doi.org/10.1142/s0217984924501483","url":null,"abstract":"The robustness of complex networks to various kinds of attacks that could trigger cascading failures has attracted increasing attention. Most existing studies fail to consider that the cost to attack each network component (node or edge) may be unequal. Therefore, in this paper, we explore the network robustness to cascaded attacks based on heterogeneous costs. We introduce an attack cost model with both cost-sensitive and budget-constraint parameters. On this basis, three attack strategies are considered, including hub strategy, average degree strategy, and leaf strategy. Their cascaded attack effects are compared by considering the load local preferential redistribution rule. Both the fraction of failed nodes and the value of a new robustness metric, i.e. the budget-constraint threshold, are monitored in different complex networks. Numerical experiments indicate that as the attack cost changes from homogeneity to heterogeneity, the performance of the classic hub strategy decreases gradually. For the situation of weak heterogeneity of attack cost of each node, leaf strategy achieves the maximum attack performance gradually. Moreover, the budget, network structure, and robustness metrics may all affect the selection of the optimal attack strategy.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":" 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139140930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-30DOI: 10.1142/s0217984924501677
Samir Azizov
This paper presents the results of a study of the dielectric constant of solutions of a polar liquid in a nonpolar solvent: chlorobenzene–benzene, chlorobenzene–hexane. The measurements were carried out at a wavelength [Formula: see text][Formula: see text]cm in the temperature range from [Formula: see text]C to [Formula: see text]C. The studies were carried out using the dielectric spectroscopy method. This method allows a more detailed study of the dielectric properties of the objects of study due to the large equilibrium (“static”) dielectric constant of the object. The temperature dependence of the dielectric relaxation time of molecules in the liquid and solid states of the studied solutions is determined. It has been established that with increasing concentration (0.300, 0.562, 0.794, 1.000 for a chlorobenzene–hexane solution and 0.179, 0.368, 0.567, 0.778, 1.000 for a chlorobenzene–benzene solution) of the halogen substituent, the relaxation time increases. The measurement results of dielectric constant [Formula: see text] and absorption coefficient [Formula: see text] obtained for concentrated solutions chlorobenzene–benzene, chlorobenzene–n–hexane at wavelengths [Formula: see text], 80 and [Formula: see text][Formula: see text]cm at temperature [Formula: see text]C are given in the paper. The static dielectric constant is obtained at a frequency of 1[Formula: see text]MHz. The obtained experimental values [Formula: see text], [Formula: see text] and [Formula: see text] of investigated systems in ([Formula: see text], [Formula: see text]) plane locate on the semi-circle the center of which is on [Formula: see text] axis. In this case, the high-frequency limit value of [Formula: see text] dielectric coefficient exceeds the corresponding n2 refraction index square. The macroscopic and molecular relaxation times are calculated on the base of experimental data. The thermodynamic quantities characterizing the process of dielectric relaxation are calculated for solutions of chlorobenzene–benzene, chlorobenzene–hexane. It has been determined that the height of the potential barrier separating the two equilibrium positions of a polar molecule is greatest in the state of a pure polar liquid and decreases with dilution in a nonpolar solvent.
{"title":"Dielectric relaxation in solutions chlorobenzene–benzene and chlorobenzene–hexane","authors":"Samir Azizov","doi":"10.1142/s0217984924501677","DOIUrl":"https://doi.org/10.1142/s0217984924501677","url":null,"abstract":"This paper presents the results of a study of the dielectric constant of solutions of a polar liquid in a nonpolar solvent: chlorobenzene–benzene, chlorobenzene–hexane. The measurements were carried out at a wavelength [Formula: see text][Formula: see text]cm in the temperature range from [Formula: see text]C to [Formula: see text]C. The studies were carried out using the dielectric spectroscopy method. This method allows a more detailed study of the dielectric properties of the objects of study due to the large equilibrium (“static”) dielectric constant of the object. The temperature dependence of the dielectric relaxation time of molecules in the liquid and solid states of the studied solutions is determined. It has been established that with increasing concentration (0.300, 0.562, 0.794, 1.000 for a chlorobenzene–hexane solution and 0.179, 0.368, 0.567, 0.778, 1.000 for a chlorobenzene–benzene solution) of the halogen substituent, the relaxation time increases. The measurement results of dielectric constant [Formula: see text] and absorption coefficient [Formula: see text] obtained for concentrated solutions chlorobenzene–benzene, chlorobenzene–n–hexane at wavelengths [Formula: see text], 80 and [Formula: see text][Formula: see text]cm at temperature [Formula: see text]C are given in the paper. The static dielectric constant is obtained at a frequency of 1[Formula: see text]MHz. The obtained experimental values [Formula: see text], [Formula: see text] and [Formula: see text] of investigated systems in ([Formula: see text], [Formula: see text]) plane locate on the semi-circle the center of which is on [Formula: see text] axis. In this case, the high-frequency limit value of [Formula: see text] dielectric coefficient exceeds the corresponding n2 refraction index square. The macroscopic and molecular relaxation times are calculated on the base of experimental data. The thermodynamic quantities characterizing the process of dielectric relaxation are calculated for solutions of chlorobenzene–benzene, chlorobenzene–hexane. It has been determined that the height of the potential barrier separating the two equilibrium positions of a polar molecule is greatest in the state of a pure polar liquid and decreases with dilution in a nonpolar solvent.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":" December","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139137118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-30DOI: 10.1142/s0217984924501616
M. Abbas, Nargis Khan, M. S. Hashmi, Mostafa Inc
The proposed study examines the effect of inclined magnetic field on a ternary hybrid nanofluid flow that is axisymmetric thermo-solutal Marangoni convective over an infinite disc. Some well-known uses of Marangoni convection include semiconductor production, atomic reactors, crystal growth, fine art mechanisms, melting, thin-film stretching and welding processes. The non-uniform heat generation and viscous dissipation are taken into account. The thermal conductivity and diffusivity coefficient are presumed to vary inversely with linear function of temperature and concentration. The ternary hybrid nanofluid, which consists of silicon dioxide ([Formula: see text]), iron oxide ([Formula: see text]), molybdenum disulfide ([Formula: see text]) and ethylene glycol as base liquid, undergoes an energy transition to improve heat transfer. The system of PDEs is transformed into nonlinear ordinary differential equations (ODEs) by using the appropriate transformations. Using the BVP4C method, this problem is numerically solved. The heat and mass phenomena rates on flow behavior are investigated using tables and graphs to address the impact of several physical and flow parameters on velocity, concentration, and thermal profiles. By increasing the Marangoni convection parameter, the surface tension gradient gets stronger, leading to more efficient heat and mass transfer inside the liquid as well as stronger induced flows. As the temperature and concentration profiles decrease, the outcome is a more consistent dispersion of these properties throughout the liquid.
{"title":"Aspects of chemical reaction and mixed convection in ternary hybrid nanofluid with Marangoni convection and heat source","authors":"M. Abbas, Nargis Khan, M. S. Hashmi, Mostafa Inc","doi":"10.1142/s0217984924501616","DOIUrl":"https://doi.org/10.1142/s0217984924501616","url":null,"abstract":"The proposed study examines the effect of inclined magnetic field on a ternary hybrid nanofluid flow that is axisymmetric thermo-solutal Marangoni convective over an infinite disc. Some well-known uses of Marangoni convection include semiconductor production, atomic reactors, crystal growth, fine art mechanisms, melting, thin-film stretching and welding processes. The non-uniform heat generation and viscous dissipation are taken into account. The thermal conductivity and diffusivity coefficient are presumed to vary inversely with linear function of temperature and concentration. The ternary hybrid nanofluid, which consists of silicon dioxide ([Formula: see text]), iron oxide ([Formula: see text]), molybdenum disulfide ([Formula: see text]) and ethylene glycol as base liquid, undergoes an energy transition to improve heat transfer. The system of PDEs is transformed into nonlinear ordinary differential equations (ODEs) by using the appropriate transformations. Using the BVP4C method, this problem is numerically solved. The heat and mass phenomena rates on flow behavior are investigated using tables and graphs to address the impact of several physical and flow parameters on velocity, concentration, and thermal profiles. By increasing the Marangoni convection parameter, the surface tension gradient gets stronger, leading to more efficient heat and mass transfer inside the liquid as well as stronger induced flows. As the temperature and concentration profiles decrease, the outcome is a more consistent dispersion of these properties throughout the liquid.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":" 17","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139142223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-30DOI: 10.1142/s0217984924501665
Zhouding Liu, A. Hussain, T. Parveen, T. F. Ibrahim, O. O. Yousif Karrar, B. R. Al-Sinan
A model condition for the propagation of ultrashort pulses in optical fiber frameworks could be established through the extensive generalization of the nonlinear Schrödinger equation introduced by Triki and Biswas. This study uses two significant and effective trustworthy methods to examine the Triki–Biswas (TB) equation. Sardar Subequation Methods (SSM) and the generalized Kudryashov (KUD) method generate solutions for trigonometric, hyperbolic, exponential, and rational functions. These approaches are specifically designed for handling solitary wave patterns, dark-singular-mixed solitons, combined dark-bright solitons, singletons, bright solitons, exponential and rational functions, as well as periodic solitons. All of these solution classes contribute to the physical dynamics of outcomes. These findings represent an innovative extension of the soliton domain within the TB model and are being reported for the first time in our investigation. In addition, Mathematica simulations are used to display the 3D and 2D graphs to explain the identified solutions’ physical dynamics.
{"title":"Numerous optical soliton solutions of the Triki–Biswas model arising in optical fiber","authors":"Zhouding Liu, A. Hussain, T. Parveen, T. F. Ibrahim, O. O. Yousif Karrar, B. R. Al-Sinan","doi":"10.1142/s0217984924501665","DOIUrl":"https://doi.org/10.1142/s0217984924501665","url":null,"abstract":"A model condition for the propagation of ultrashort pulses in optical fiber frameworks could be established through the extensive generalization of the nonlinear Schrödinger equation introduced by Triki and Biswas. This study uses two significant and effective trustworthy methods to examine the Triki–Biswas (TB) equation. Sardar Subequation Methods (SSM) and the generalized Kudryashov (KUD) method generate solutions for trigonometric, hyperbolic, exponential, and rational functions. These approaches are specifically designed for handling solitary wave patterns, dark-singular-mixed solitons, combined dark-bright solitons, singletons, bright solitons, exponential and rational functions, as well as periodic solitons. All of these solution classes contribute to the physical dynamics of outcomes. These findings represent an innovative extension of the soliton domain within the TB model and are being reported for the first time in our investigation. In addition, Mathematica simulations are used to display the 3D and 2D graphs to explain the identified solutions’ physical dynamics.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":" 34","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139139600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-30DOI: 10.1142/s0217984924501689
Muyun Lyu, Guxin Xu, Baozhu Cheng, Zhaowang Xia
The capacity of Phononic crystals (PCs) to form bandgaps (BGs) that limit the transmission of elastic/acoustic waves is a key property that is particularly beneficial for vibration/sound isolation and signal processing. In this work, a parametric analysis of Poisson’s ratio of rubber, and the density, geometry and size of scatterer on the BGs of porous, solid/solid, fluid/solid and solid/fluid PCs is presented. Based on the simulation results, it is found that the width of the first absolute bandgaps (FABGs) of porous PCs is not necessarily proportional to the porosity due to the pore shape; when Poisson’s ratio of compressible and incompressible rubber is increased, the FABG width of porous PC decreases dramatically. In addition, the FABGs of solid/solid PCs are strongly dependent on whether the rubber is a matrix or scatterer; the fluctuation of the FABGs is also highly related to the density of the solid. Fluid–structure PCs have smaller FABGs than porous and solid/solid PCs, and these FABGs usually occur within higher-order energy bands. Rubber compressibility significantly affects the FABGs of porous and solid/solid PCs, but almost not fluid-structural PCs. The results presented in this work offer guidance to tune the BG and design acoustic devices in various practical applications such as noise and vibration insulators.
声波晶体（PC）能够形成限制弹性/声波传播的带隙（BG），这是一项关键特性，尤其有利于振动/声音隔离和信号处理。本研究对橡胶的泊松比以及散射体的密度、几何形状和尺寸对多孔、固/固、流/固和固/流 PC 的带隙的影响进行了参数分析。根据模拟结果发现，由于孔隙形状的原因，多孔 PC 的第一绝对带隙（FABG）宽度不一定与孔隙率成正比；当可压缩橡胶和不可压缩橡胶的泊松比增大时，多孔 PC 的 FABG 宽度急剧下降。此外，固体/固体 PC 的 FABG 与橡胶是基体还是散射体密切相关；FABG 的波动也与固体的密度密切相关。流体-结构 PC 的 FABG 小于多孔 PC 和固体/固体 PC，而且这些 FABG 通常出现在高阶能带内。橡胶压缩性对多孔和固体/固体 PC 的 FABG 有很大影响，但对流体结构 PC 几乎没有影响。本研究的结果为调整 BG 和设计各种实际应用中的声学设备（如噪声和振动绝缘体）提供了指导。
{"title":"Parametric analysis: Compressibility of rubber on bandgap for phononic crystals","authors":"Muyun Lyu, Guxin Xu, Baozhu Cheng, Zhaowang Xia","doi":"10.1142/s0217984924501689","DOIUrl":"https://doi.org/10.1142/s0217984924501689","url":null,"abstract":"The capacity of Phononic crystals (PCs) to form bandgaps (BGs) that limit the transmission of elastic/acoustic waves is a key property that is particularly beneficial for vibration/sound isolation and signal processing. In this work, a parametric analysis of Poisson’s ratio of rubber, and the density, geometry and size of scatterer on the BGs of porous, solid/solid, fluid/solid and solid/fluid PCs is presented. Based on the simulation results, it is found that the width of the first absolute bandgaps (FABGs) of porous PCs is not necessarily proportional to the porosity due to the pore shape; when Poisson’s ratio of compressible and incompressible rubber is increased, the FABG width of porous PC decreases dramatically. In addition, the FABGs of solid/solid PCs are strongly dependent on whether the rubber is a matrix or scatterer; the fluctuation of the FABGs is also highly related to the density of the solid. Fluid–structure PCs have smaller FABGs than porous and solid/solid PCs, and these FABGs usually occur within higher-order energy bands. Rubber compressibility significantly affects the FABGs of porous and solid/solid PCs, but almost not fluid-structural PCs. The results presented in this work offer guidance to tune the BG and design acoustic devices in various practical applications such as noise and vibration insulators.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":" 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139140149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-28DOI: 10.1142/s0217984924501549
R. K. Sahoo, S. R. Mishra
Today’s need of the growing industries is to get better products with long life which depends upon the production processes. This requires enhanced thermal properties of the fluid as well as the components surrounding to it. Therefore, this study reveals the flow of several water-based nanofluids past an expanding sheet. Oxide nanoparticles, such as Al2O3 and CuO, are considered in the base liquid water to show their behavior on the flow phenomena. Further, dissipative heat properties due to magnetization, i.e. Joule and viscous dissipation enrich the study. The novelty of this study is the consideration of KKL “(Koo–Kleinstreuer–Li) correlation” for the conductivity and viscosity plays its important role in which the influence of Brownian activity is vital. The utilization of similarity rules is beneficial for the transformation of the governing equations into non-dimensional form. Further, the shooting-based Runge–Kutta technique is useful for the solution of these set of equations. The characterization of diversified components likely the particle concentration, magnetic and buoyancy parameter on the velocity distribution along with the Eckert number, and thermal radiation on the energy profile is obtained and deliberated briefly.
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Layered metal composites have been widely used in various industries fields because of their excellent properties and are responsible for mechanical behavior of materials. This paper focuses on analyzing the deformation mechanism of the (110) interface under different loading states by MD. The results show that there are two yield points in the stress–strain curve under both Z- and Y-axis loading states. The first yield is the nucleation of dislocations at the interface, meantime the slip of dislocations and the extension of stacking faults begin at the Al layer. The second one, the dislocation passes through the interface, nucleates and emits toward the Cu layer at the interface, leading to a stress mutation. It is worth noting that during the stable rheological stage, the deformation mechanisms vary under different loading directions. Under Y-axis tensile loading, the phase transformation of FCC–HCP is present due to the interaction of dislocation movement and stacking fault. On the contrary, there are two twin paths A and B, improving the strength, during Z-axis compression loading. For other loading modes, there are three zones, namely the elastic stage, the release of energy, and strain hardening and dynamic softening. The interface plays the role of nucleation, annihilation and penetration of dislocations, and this interface-dislocation mechanism is reflected in the whole stage of plastic deformation. The results have an insight into the design and control in heterointerface.
层状金属复合材料因其优异的性能被广泛应用于各行各业，并对材料的力学行为起着重要作用。本文主要通过 MD 分析了 (110) 接口在不同加载状态下的变形机理。结果表明，在 Z 轴和 Y 轴加载状态下，应力-应变曲线上存在两个屈服点。第一个屈服点是位错在界面上成核，同时位错的滑移和堆叠断层的扩展从铝层开始。第二种屈服是位错穿过界面，在界面处成核并向铜层发射，导致应力突变。值得注意的是，在稳定流变阶段，不同加载方向下的变形机制各不相同。在 Y 轴拉伸加载下，由于位错运动和堆积断层的相互作用，FCC-HCP 出现了相变。相反，在 Z 轴压缩加载时，存在 A 和 B 两条孪生路径，从而提高了强度。对于其他加载模式，则存在三个区域，即弹性阶段、能量释放、应变硬化和动态软化。界面起着位错成核、湮灭和穿透的作用，这种界面-位错机制体现在整个塑性变形阶段。研究结果对异质界面的设计和控制具有启示意义。
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