Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d08
S. Parida, Jyotirmayee Nanda
A series of polycrystalline Eu-Cr co-doped BiFeO3 nanoparticles were synthesized using the sol-gel method. The obtained samples were characterized by employing the XRD, FTIR, FESEM, UV-vis, LCR meter, and SQUID techniques. XRD analysis confirmed rhombohedral phase formation for all samples, and the crystallite sizes decreased with higher Cr3+ doping concentrations. The stretching and bending vibrations of Fe-O bondings in FeO6 octahedra and the formation of perovskite nature were confirmed by the FTIR analysis. From microstructural studies, a decrease in crystallite size with increased doping concentration was observed, corroborating the XRD results. The magnetic studies revealed an enhanced magnetization, probably caused by the distorted cycloid spin structure of the Cr-doped nanoparticles with size ≤ 62 nm. The lower value of the squareness ratio of the M-H loop indicated strong interaction between the magnetic domains, which might have played a great role in the enhancement of the saturation magnetization of the doped samples. The dielectric constant and loss tangent were evaluated as a function of frequency at room temperature. The photocatalytic activities of all the samples were evaluated by measuring the degradation of RhB dye under sunlight irradiation. The highest photocatalytic degradation efficiency of 94% was achieved with the substitution of Cr3+ and Eu3+ ions in BiFeO3 nanoparticles
{"title":"Enhanced dielectric, magnetic, and photocatalytic properties of sol-gel synthesized Eu-Cr codoped BiFeO3 nanoparticles","authors":"S. Parida, Jyotirmayee Nanda","doi":"10.1088/1402-4896/ad6d08","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d08","url":null,"abstract":"\u0000 A series of polycrystalline Eu-Cr co-doped BiFeO3 nanoparticles were synthesized using the sol-gel method. The obtained samples were characterized by employing the XRD, FTIR, FESEM, UV-vis, LCR meter, and SQUID techniques. XRD analysis confirmed rhombohedral phase formation for all samples, and the crystallite sizes decreased with higher Cr3+ doping concentrations. The stretching and bending vibrations of Fe-O bondings in FeO6 octahedra and the formation of perovskite nature were confirmed by the FTIR analysis. From microstructural studies, a decrease in crystallite size with increased doping concentration was observed, corroborating the XRD results. The magnetic studies revealed an enhanced magnetization, probably caused by the distorted cycloid spin structure of the Cr-doped nanoparticles with size ≤ 62 nm. The lower value of the squareness ratio of the M-H loop indicated strong interaction between the magnetic domains, which might have played a great role in the enhancement of the saturation magnetization of the doped samples. The dielectric constant and loss tangent were evaluated as a function of frequency at room temperature. The photocatalytic activities of all the samples were evaluated by measuring the degradation of RhB dye under sunlight irradiation. The highest photocatalytic degradation efficiency of 94% was achieved with the substitution of Cr3+ and Eu3+ ions in BiFeO3 nanoparticles","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"14 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d04
mohamed Adel Sabour, mohamed ibrahim nouh, Essam Elkhouly, Ian R Stevens
We study the period change of six Cepheids using 19376 accurate flux observations of the Solar Mass Ejection Imager (SMEI) onboard the Coriolis spacecraft. All observations for the six Cepheids have been derived as templates for each star, independent of the specific sites utilized to establish and update the O-C values. Sometimes, sinusoidal patterns are superimposed on the star's O-C changes, which cannot be regarded as random fluctuations in the pulsation period. Random period changes were detected and computed using Eddington's and Plakidis's approaches. A comparison of the observed and predicted period change reveals a good agreement with some published models and a very substantial divergence with others. Between the reported period change and that estimated by the current technique, a linear fit with a correlation coefficient of 90.08 percent was obtained. The temporal rate of period change in Cepheid stars might be connected to how well these stars' mass losses are known today.
{"title":"Study of Changes in the Pulsation Period of six Cepheids Variable","authors":"mohamed Adel Sabour, mohamed ibrahim nouh, Essam Elkhouly, Ian R Stevens","doi":"10.1088/1402-4896/ad6d04","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d04","url":null,"abstract":"\u0000 We study the period change of six Cepheids using 19376 accurate flux observations of the Solar Mass Ejection Imager (SMEI) onboard the Coriolis spacecraft. All observations for the six Cepheids have been derived as templates for each star, independent of the specific sites utilized to establish and update the O-C values. Sometimes, sinusoidal patterns are superimposed on the star's O-C changes, which cannot be regarded as random fluctuations in the pulsation period. Random period changes were detected and computed using Eddington's and Plakidis's approaches. A comparison of the observed and predicted period change reveals a good agreement with some published models and a very substantial divergence with others. Between the reported period change and that estimated by the current technique, a linear fit with a correlation coefficient of 90.08 percent was obtained. The temporal rate of period change in Cepheid stars might be connected to how well these stars' mass losses are known today.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"38 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d02
M. Derakhshan, S. L. Mortazavifar, P. Veeresha, J. F. Gómez‐Aguilar
In this article, we study and analyze the two-dimensional time-fractional Cattaneo model with Riesz space distributed-order. To obtain approximate solutions of this type of fractional model the combined and effective numerical approach based on the ADI Galerkin method and the Legendre spectral method used the ADI Galerkin numerical method uses the finite difference approach. The ADI Galerkin numerical method is used to approximate the proposed model in terms of the time variable, and the Legendre spectral method is applied to discretize the fractional model with respect to the space variable. Also, the convergence analysis and stability of the proposed method are discussed and reviewed in this manuscript. In the end, some numerical examples are tested for the effectiveness and accuracy of the proposed method.
本文研究分析了具有里兹空间分布阶的二维时间分数卡塔尼奥模型。为了得到这类分数模型的近似解，我们采用了基于 ADI Galerkin 方法和 Legendre 光谱法的组合而有效的数值方法。ADI Galerkin 数值方法用于在时间变量上近似拟建模型，而 Legendre 频谱方法则用于在空间变量上离散分形模型。此外，本手稿还讨论和评述了所提方法的收敛性分析和稳定性。最后，通过一些数值实例检验了所提方法的有效性和准确性。
{"title":"An efficient hybrid approach for numerical study of two-dimensional time-fractional Cattaneo model with Riesz distributed-order space-fractional operator along with stability analysis","authors":"M. Derakhshan, S. L. Mortazavifar, P. Veeresha, J. F. Gómez‐Aguilar","doi":"10.1088/1402-4896/ad6d02","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d02","url":null,"abstract":"\u0000 In this article, we study and analyze the two-dimensional time-fractional Cattaneo model with Riesz space distributed-order. To obtain approximate solutions of this type of fractional model the combined and effective numerical approach based on the ADI Galerkin method and the Legendre spectral method used the ADI Galerkin numerical method uses the finite difference approach. The ADI Galerkin numerical method is used to approximate the proposed model in terms of the time variable, and the Legendre spectral method is applied to discretize the fractional model with respect to the space variable. Also, the convergence analysis and stability of the proposed method are discussed and reviewed in this manuscript. In the end, some numerical examples are tested for the effectiveness and accuracy of the proposed method.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"4 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d0a
A. Sefiedgar, Hossein Jabari
The emergence of the minimal observable length is commonly accepted in most of the quantum gravitational candidates. The existence of such a minimal length in high energy physics necessitates some revisions to the standard uncertainty principle. The generalized uncertainty principle is particularly suitable for incorporating such a finite resolution of the space-time and may provide a useful phenomenological approach to study the physics of quantum gravity. It is possible to use the generalized uncertainty principle to modify the black hole thermodynamics straightforwardly. However, it is also possible to use the generalized uncertainty principle to modify the black hole metric itself. In this paper, we are going to modify the Reissner-Nordström metric in the presence of the quantum gravitational effects via the generalized uncertainty principle. Then, we use the modified charged black hole metric to study the black hole thermodynamics. The modified metric is also applied to study the light deflection angle.
{"title":"The corrections to the metric of Reissner-Nordström Black Hole from the Generalized Uncertainty Principle","authors":"A. Sefiedgar, Hossein Jabari","doi":"10.1088/1402-4896/ad6d0a","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d0a","url":null,"abstract":"\u0000 The emergence of the minimal observable length is commonly accepted in most of the quantum gravitational candidates. The existence of such a minimal length in high energy physics necessitates some revisions to the standard uncertainty principle. The generalized uncertainty principle is particularly suitable for incorporating such a finite resolution of the space-time and may provide a useful phenomenological approach to study the physics of quantum gravity. It is possible to use the generalized uncertainty principle to modify the black hole thermodynamics straightforwardly. However, it is also possible to use the generalized uncertainty principle to modify the black hole metric itself. In this paper, we are going to modify the Reissner-Nordström metric in the presence of the quantum gravitational effects via the generalized uncertainty principle. Then, we use the modified charged black hole metric to study the black hole thermodynamics. The modified metric is also applied to study the light deflection angle.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"14 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d11
S. Mishra, Alka Mishra, Pushpendra Singh
Numerical investigation into the effects of vibration on heat transfer and entropy generation in Newtonian and Non-Newtonian nanofluid flows through pipes reveals enhanced heat transfer via intensified fluid agitation and improved particle dispersion. Mechanical vibrations destabilize fluid flow and heat transfer but increase heat transfer rates by inducing swirling motion and enhancing radial mixing, leading to a more uniform temperature distribution. Thermal entropy generation analysis shows reduced irreversibility in vibrated flow, indicating improved flow mixing. Vibration enhances heat transfer by intensifying fluid agitation and promoting particle dispersion near the wall, resulting in a significantly more uniform temperature distribution along the pipe, approximately 100 times more than steady-state flow. This study underscores vibration's potential to optimize heat transfer and reduce entropy generation in nanofluid systems, emphasizing velocity and rheological impacts. Comparison of vibrated flow to steady-state flow for Newtonian and non-Newtonian fluids reveals significant improvements under vibration, particularly at lower Reynolds numbers where non-Newtonian fluids exhibit pronounced effects. Future research directions include exploring thermal radiation's impact on entropy generation, analyzing different nanofluid compositions, and investigating varied boundary conditions and geometries to advance understanding in this field. This study provides valuable insights into the complex interplay among vibration, fluid dynamics, and heat transfer in nanofluid flows. Its findings have practical implications for optimizing thermal management systems in diverse engineering applications
{"title":"Entropy generation in Newtonian Vs Non-Newtonian nanofluid flow under vibration","authors":"S. Mishra, Alka Mishra, Pushpendra Singh","doi":"10.1088/1402-4896/ad6d11","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d11","url":null,"abstract":"\u0000 Numerical investigation into the effects of vibration on heat transfer and entropy generation in Newtonian and Non-Newtonian nanofluid flows through pipes reveals enhanced heat transfer via intensified fluid agitation and improved particle dispersion. Mechanical vibrations destabilize fluid flow and heat transfer but increase heat transfer rates by inducing swirling motion and enhancing radial mixing, leading to a more uniform temperature distribution. Thermal entropy generation analysis shows reduced irreversibility in vibrated flow, indicating improved flow mixing. Vibration enhances heat transfer by intensifying fluid agitation and promoting particle dispersion near the wall, resulting in a significantly more uniform temperature distribution along the pipe, approximately 100 times more than steady-state flow. This study underscores vibration's potential to optimize heat transfer and reduce entropy generation in nanofluid systems, emphasizing velocity and rheological impacts. Comparison of vibrated flow to steady-state flow for Newtonian and non-Newtonian fluids reveals significant improvements under vibration, particularly at lower Reynolds numbers where non-Newtonian fluids exhibit pronounced effects. Future research directions include exploring thermal radiation's impact on entropy generation, analyzing different nanofluid compositions, and investigating varied boundary conditions and geometries to advance understanding in this field. This study provides valuable insights into the complex interplay among vibration, fluid dynamics, and heat transfer in nanofluid flows. Its findings have practical implications for optimizing thermal management systems in diverse engineering applications","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"91 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141926767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d1a
Jing He, Yu Yan, Yajie Wu
Topological defects such as vortex and dislocations, support zero-energy localized states as a reflection of the bulk topology, in first-order topological insulators and superconductors. Furthermore, emergent first-order topological mid-gap states have been discovered driven by the magnetic vortex superlattice. However, whether the higher-order topological mid-gap states would emerge from the first-order topological insulators and superconductors with the vortex superlattice remains elusive. In this work, we propose vortex superlattice could induce second-order topological mid-gap states with staggered lattice spacings for vortices in first-order topological insulators and superconductors. These higher-order topological mid-gap states originate from the staggered tunneling between vortex-induced bound states and the emergent π flux on vortex superlattices, as an intrinsic exhibition of the interplay between vortices and bulk topology for the first-order topological states. Our work uncovers higher-topological characteristics of topological-defect superlattice in first-order topological states, and develops a controllable environment for the creation and exploration of higher-order topological states.
{"title":"Vortex superlattice induced second-order topological mid-gap states in first-order topological insulators and superconductors","authors":"Jing He, Yu Yan, Yajie Wu","doi":"10.1088/1402-4896/ad6d1a","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d1a","url":null,"abstract":"\u0000 Topological defects such as vortex and dislocations, support zero-energy localized states as a reflection of the bulk topology, in first-order topological insulators and superconductors. Furthermore, emergent first-order topological mid-gap states have been discovered driven by the magnetic vortex superlattice. However, whether the higher-order topological mid-gap states would emerge from the first-order topological insulators and superconductors with the vortex superlattice remains elusive. In this work, we propose vortex superlattice could induce second-order topological mid-gap states with staggered lattice spacings for vortices in first-order topological insulators and superconductors. These higher-order topological mid-gap states originate from the staggered tunneling between vortex-induced bound states and the emergent π flux on vortex superlattices, as an intrinsic exhibition of the interplay between vortices and bulk topology for the first-order topological states. Our work uncovers higher-topological characteristics of topological-defect superlattice in first-order topological states, and develops a controllable environment for the creation and exploration of higher-order topological states.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"16 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d0f
Peichen Hao, Wenzhi Liu, Jian Wang
The magnetic properties of Heusler alloys have been a hot research topic. However, the current understanding of the properties of Ru-based Heusler alloys is still very limited. The magnetic, electronic, and mechanical properties of four Ru-based Heusler alloys, Ru2XAl (X=Mn, Zr, Ti, Hf) were calculated by the first-principles. This article studied the basic mechanical parameters of four types of Heusler alloys, such as bulk elastic modulus, Cauchy pressure, Pugh’s ratio, shear modulus, Kleinman parameter, Young's modulus, Poisson's ratio, and elastic constant. The calculated results of the elastic constant prove that all four alloys are mechanically stable. Ru2MnAl alloy exhibits brittleness, while the other three alloys exhibit excellent ductility based on Poisson's ratio and Pugh’s ratio. The Kleinman parameter of the four alloys are all greater than 0.5, indicating that they have stronger stability in the tensile state. In addition, the magnetism of Ru2MnAl is 2.113 , which is consistent with the SP rule and other theoretical calculations.
{"title":"First-principles study on electronic and mechanical properties of Ru2XAl (X=Mn, Zr, Ti, Hf) alloys","authors":"Peichen Hao, Wenzhi Liu, Jian Wang","doi":"10.1088/1402-4896/ad6d0f","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d0f","url":null,"abstract":"\u0000 The magnetic properties of Heusler alloys have been a hot research topic. However, the current understanding of the properties of Ru-based Heusler alloys is still very limited. The magnetic, electronic, and mechanical properties of four Ru-based Heusler alloys, Ru2XAl (X=Mn, Zr, Ti, Hf) were calculated by the first-principles. This article studied the basic mechanical parameters of four types of Heusler alloys, such as bulk elastic modulus, Cauchy pressure, Pugh’s ratio, shear modulus, Kleinman parameter, Young's modulus, Poisson's ratio, and elastic constant. The calculated results of the elastic constant prove that all four alloys are mechanically stable. Ru2MnAl alloy exhibits brittleness, while the other three alloys exhibit excellent ductility based on Poisson's ratio and Pugh’s ratio. The Kleinman parameter of the four alloys are all greater than 0.5, indicating that they have stronger stability in the tensile state. In addition, the magnetism of Ru2MnAl is 2.113 , which is consistent with the SP rule and other theoretical calculations.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"24 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d05
Guo Li, Ming Lei, XiaoLi Zhang, Yan Zeng, Shaojie Tang, Jianxu Shi, Liqing Hu
To meet the ultrasonic application requirement of high power intensity and large mechanical displacement, a new theoretical method is used to study the multi-mode characteristic of the cascaded piezoelectric transducer with cone horn in this paper. Based on equivalent circuit and Kirchhoff's law to obtain the frequency equation and vibration velocity expression of the transducer, then the resonance frequency and effective electromechanical coupling coefficient can be calculated, the velocity amplification ratio can be obtained in the meantime. This method is distinguish from traditional theoretical analysis, which avoids complex transformation of the multi-excitation sources in cascaded structure, and can calculate more performance parameters. The relationships between these performance parameters and the excitation position of the piezoelectric stack, the length and output end radius of the cone horn are analyzed and compared with the numerical simulation, and the optimized parameters of the transducer size are given. A transducer is manufactured for experimental test, the results show that the experimental value is in good agreement with theoretical calculation and finite element simulation. This work is expected to be used in the optimal analysis of the multi-mode transducer in high power ultrasonic field.
{"title":"Investigation of a cascaded piezoelectric transducer with cone horn for multi-mode power ultrasound application","authors":"Guo Li, Ming Lei, XiaoLi Zhang, Yan Zeng, Shaojie Tang, Jianxu Shi, Liqing Hu","doi":"10.1088/1402-4896/ad6d05","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d05","url":null,"abstract":"\u0000 To meet the ultrasonic application requirement of high power intensity and large mechanical displacement, a new theoretical method is used to study the multi-mode characteristic of the cascaded piezoelectric transducer with cone horn in this paper. Based on equivalent circuit and Kirchhoff's law to obtain the frequency equation and vibration velocity expression of the transducer, then the resonance frequency and effective electromechanical coupling coefficient can be calculated, the velocity amplification ratio can be obtained in the meantime. This method is distinguish from traditional theoretical analysis, which avoids complex transformation of the multi-excitation sources in cascaded structure, and can calculate more performance parameters. The relationships between these performance parameters and the excitation position of the piezoelectric stack, the length and output end radius of the cone horn are analyzed and compared with the numerical simulation, and the optimized parameters of the transducer size are given. A transducer is manufactured for experimental test, the results show that the experimental value is in good agreement with theoretical calculation and finite element simulation. This work is expected to be used in the optimal analysis of the multi-mode transducer in high power ultrasonic field.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"19 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1088/1402-4896/ad6d06
Tarunpreet Singh, Shankar Sehgal
Owing to the unique encouraging characteristics of microwave hybrid heating, primarily volumetric heating, and additional potentials such as being repeatable, quick, economical, and green; it has been utilized in various processing techniques. The efficient joining of mild steel pipes through microwave hybrid heating in a multimode applicator at 2.45 GHz and 900 W for an operational time of 480s has already been performed. The modeling and simulation of the process have been performed in this research paper as the numerical analysis of the working environment is crucial for evaluating various aspects of a technique, decreases process-design cycle time, and found to be more economical than experimental trials. The numerical analysis provides in-depth insight-taking into consideration of the electromagnetic field distribution, its interaction with the materials, heat generation and transfer, along with the thermal analysis of the experimental assembly, in addition to the comprehensive parametric analysis. The numerical model of the assembled set-up was developed in order to simulate a real-life heating environment by solving electromagnetic and heat transfer equations and providing analytically predicted results with an accuracy of 3.75% against the experimental results. The analytical modeling and simulation have been strategically fragmented into three phases which are pre-processing, processing, and post-processing phase and elucidated extensively, providing a systematic working of the analytical model. This research will be utilized further in optimizing the microwave hybrid heating process in order to make it time-efficient and inexpensive for its applications to industrial environments.
由于微波混合加热（主要是容积加热）具有独特的令人鼓舞的特性，以及可重复、快速、经济和绿色等其他潜力，它已被用于各种加工技术中。在 2.45 GHz 和 900 W 的多模应用器中，通过微波混合加热对低碳钢管进行高效连接，工作时间为 480 秒。本研究论文对该工艺进行了建模和仿真，因为工作环境的数值分析对于评估一项技术的各个方面至关重要，可以缩短工艺设计周期，而且比实验试验更经济。除了综合参数分析之外，数值分析还考虑了电磁场分布、电磁场与材料的相互作用、热量产生和传递，以及实验装配的热分析，从而提供了深入的见解。为了模拟现实生活中的加热环境，通过求解电磁和传热方程，开发了组装装置的数值模型，并提供了分析预测结果，与实验结果相比，精确度达到 3.75%。分析建模和模拟从战略上分为三个阶段，即前处理、处理和后处理阶段，并进行了广泛阐释，为分析模型提供了系统的工作方法。这项研究将进一步用于优化微波混合加热工艺，使其在工业环境中的应用既省时又便宜。
{"title":"Thermal modeling and simulation applied to novel microwave hybrid heating process","authors":"Tarunpreet Singh, Shankar Sehgal","doi":"10.1088/1402-4896/ad6d06","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d06","url":null,"abstract":"\u0000 Owing to the unique encouraging characteristics of microwave hybrid heating, primarily volumetric heating, and additional potentials such as being repeatable, quick, economical, and green; it has been utilized in various processing techniques. The efficient joining of mild steel pipes through microwave hybrid heating in a multimode applicator at 2.45 GHz and 900 W for an operational time of 480s has already been performed. The modeling and simulation of the process have been performed in this research paper as the numerical analysis of the working environment is crucial for evaluating various aspects of a technique, decreases process-design cycle time, and found to be more economical than experimental trials. The numerical analysis provides in-depth insight-taking into consideration of the electromagnetic field distribution, its interaction with the materials, heat generation and transfer, along with the thermal analysis of the experimental assembly, in addition to the comprehensive parametric analysis. The numerical model of the assembled set-up was developed in order to simulate a real-life heating environment by solving electromagnetic and heat transfer equations and providing analytically predicted results with an accuracy of 3.75% against the experimental results. The analytical modeling and simulation have been strategically fragmented into three phases which are pre-processing, processing, and post-processing phase and elucidated extensively, providing a systematic working of the analytical model. This research will be utilized further in optimizing the microwave hybrid heating process in order to make it time-efficient and inexpensive for its applications to industrial environments.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"14 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hydrogen peroxide (H2O2) is a common chemical substance that is widely used in many industries. Within a certain concentration range, hydrogen peroxide is hazardous and toxic. Therefore, it is crucial to accurately determine the concentration of hydrogen peroxide for safety and diagnostic purposes. Herein, a label-free biochemical sensor is proposed and experimentally demonstrated for highly efficient H2O2 detection. The biosensor is based on a misaligned square coreless fiber, which is fabricated using ultrasonic vibrational cutting technology. The surface of the square coreless fiber is functionalized with catalytic enzymes through covalent bonding, allowing for the accurate detection of H2O2 concentration. The experimental results show that label-free biochemical sensor exhibits a sensitivity of 0.0083 nm/μM within the H2O2 concentration range of 0-800 μM. A low limit of detection of 7.95×10-4mol/L is also obtained during the detection of H2O2solution. Furthermore, the developed optical sensor provides a biochemical platform for determining enzyme-catalyzed reactions and can be applied in the fields of food safety, health monitoring, and environmental protection.
{"title":"Label-free biochemical sensor for hydrogen peroxide detection enabled by a misaligned square coreless fiber","authors":"Xiao Liu, Qianying Feng, Jixuan Wu, Binbin Song, Hanchao Sun, Jifang Wang","doi":"10.1088/1402-4896/ad6d17","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d17","url":null,"abstract":"\u0000 Hydrogen peroxide (H2O2) is a common chemical substance that is widely used in many industries. Within a certain concentration range, hydrogen peroxide is hazardous and toxic. Therefore, it is crucial to accurately determine the concentration of hydrogen peroxide for safety and diagnostic purposes. Herein, a label-free biochemical sensor is proposed and experimentally demonstrated for highly efficient H2O2 detection. The biosensor is based on a misaligned square coreless fiber, which is fabricated using ultrasonic vibrational cutting technology. The surface of the square coreless fiber is functionalized with catalytic enzymes through covalent bonding, allowing for the accurate detection of H2O2 concentration. The experimental results show that label-free biochemical sensor exhibits a sensitivity of 0.0083 nm/μM within the H2O2 concentration range of 0-800 μM. A low limit of detection of 7.95×10-4mol/L is also obtained during the detection of H2O2solution. Furthermore, the developed optical sensor provides a biochemical platform for determining enzyme-catalyzed reactions and can be applied in the fields of food safety, health monitoring, and environmental protection.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"99 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141926496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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