Physics Open最新文献_第10页

Effect of Sn doping on structural, magnetic and power loss properties of lithium ferrites for high frequency applications 锡掺杂对高频应用锂铁氧体结构、磁性和功率损耗性能的影响

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100155

Neelam Singh , Manish Kumar Kansal , Praduman Kumar , Samiksha Dabas , Vivek Verma

{"title":"Effect of Sn doping on structural, magnetic and power loss properties of lithium ferrites for high frequency applications","authors":"Neelam Singh , Manish Kumar Kansal , Praduman Kumar , Samiksha Dabas , Vivek Verma","doi":"10.1016/j.physo.2023.100155","DOIUrl":"10.1016/j.physo.2023.100155","url":null,"abstract":"<div><p>The role of Sn doping on the structural, magnetic and power loss properties of Li<sub>0.5+0.5x</sub>Sn<sub>x</sub>Fe<sub>2.5-1.5x</sub>O<sub>4</sub> ferrites (x = 0.0 to 0.20 in step of 0.05) + 0.5 wt % Bi<sub>2</sub>O<sub>3</sub>, prepared by solid state technique, has been investigated. X-ray diffraction reveals that Sn ions doped in lithium ferrite up to small concentration. Surface morphology recorded by SEM micrographs illustrates uniform, well connected grain growth in all samples. A small concentration of Sn doping in lithium ferrite improves the grain growth and densification. Magnetic parameters have been evaluated by M − H curves measured at room temperature by VSM. Saturation magnetization was found to be decreasing with Sn concentration in Li<sub>0.5+0.5x</sub>Sn<sub>x</sub>Fe<sub>2.5-1.5x</sub>O<sub>4</sub> ferrites. In view of applicability of prepared samples for power devices, the magnetic permeability (μ* = μ′-jμ'′) has been recorded in the frequency range of 1 MHz–10<sup>3</sup> MHz at room temperature. Further, Power loss response has also been recorded in presence of magnetic induction (B = 10 mT) in frequency range of 50 kHz to 3 MHz. It was depicted a significant reduction in power loss in Sn = 0.05 doped lithium ferrite sample. Reduction in power loss with Sn doping makes it suitable for power applications.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"16 ","pages":"Article 100155"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48606437","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}

引用次数: 0

Investigation for brownian motion of nonlinear thermal bioconvective SPF in a nanofluid utilizing AGM method 利用AGM方法研究纳米流体中非线性热生物对流SPF的布朗运动

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100161

A. Hasibi , A. Gholami , Z. Asadi , D. D Ganji

{"title":"Investigation for brownian motion of nonlinear thermal bioconvective SPF in a nanofluid utilizing AGM method","authors":"A. Hasibi , A. Gholami , Z. Asadi , D. D Ganji","doi":"10.1016/j.physo.2023.100161","DOIUrl":"10.1016/j.physo.2023.100161","url":null,"abstract":"<div><p>An analysis of the bioconvective slump point flow of nanofluid is addressed. The studied nanofluid, which contains gyrotactic microorganisms, was investigated in a porous medium on a nonlinear tensile plate in which it was placed. The scaling group transformation approach converted the analyzed PDEs to ODEs. ODEs obtained are solved using the numerical method (rkf-45) and AGM, and the results are compared with DTM and RKF methods. The accuracy of the obtained answers is remarkable compared to the mentioned methods. An increase in the density of motile microorganism distribution caused by the increment in values of bioconvection Peclet number is desired. In addition, a rapid increase in heat transfer rate and mass transfer rate happens when there is an increase in the thermophoresis parameter, heat source parameter, chemical reaction parameter, and Brownian motion parameter in a sequence. In this study, we investigated the SPF of bioconvective nanofluids containing GM. It is observed that the flow velocity increases as Da<sup>−1</sup> decreases. As Rb increases, bioconvection increases. These studies may be used for biotechnological applications, such as the design of bioconjugates or the increase of mass transfer in microfluidics.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"16 ","pages":"Article 100161"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41731235","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}

引用次数: 0

Design and numerical analysis of a novel photonic crystal fiber based chemicals sensor in the THz regime 太赫兹波段新型光子晶体光纤化学传感器的设计与数值分析

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100168

Md. Selim Hossain, Rakib Hossen, Syada Tasmia Alvi, Shuvo Sen, Md Al-Amin

引用次数: 0

Accuracy of the new modified Morse potential energy function for ground and excited states of diatomic molecules 双原子分子基态和激发态新修正莫尔斯势能函数的准确性

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100159

S.U. Lotliker , R. Samant , N. Mesquita , D. Liu , A.M. Desai

引用次数: 0

Calculations of energy levels, radiative transition parameters, hyperfine structure constants AJ - BJ, Landé gJ factors and isotope shifts for Sc XX using the MCDF-RCI method 用MCDF-RCI方法计算Sc XX的能级、辐射跃迁参数、超精细结构常数AJ - BJ、land<s:1> gJ因子和同位素位移

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100160

Shikha Rathi, Lalita Sharma

{"title":"Calculations of energy levels, radiative transition parameters, hyperfine structure constants AJ - BJ, Landé gJ factors and isotope shifts for Sc XX using the MCDF-RCI method","authors":"Shikha Rathi, Lalita Sharma","doi":"10.1016/j.physo.2023.100160","DOIUrl":"https://doi.org/10.1016/j.physo.2023.100160","url":null,"abstract":"<div><p>Large scale calculations for the energy levels, transition rates, oscillator strengths, lifetimes, hyperfine interaction constants, Landé <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>J</mi></mrow></msub></math></span> factors, and isotope shift factors have been performed for <span><math><mrow><mn>1</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> and <span><math><mrow><mn>1</mn><mi>s</mi><mi>n</mi><mi>l</mi></mrow></math></span> <span><math><mrow><mo>(</mo><mi>n</mi><mo>=</mo><mn>2</mn><mo>−</mo><mn>8</mn><mspace></mspace><mi>and</mi><mspace></mspace><mi>l</mi><mo>≤</mo><mi>n</mi><mo>−</mo><mn>1</mn><mo>)</mo></mrow></math></span> levels of He-like Sc XX ion. The general-purpose relativistic atomic structure package (GRASP2018) based on the fully relativistic multiconfiguration Dirac–Fock (MCDF) method is used to carry out the calculations. The leading quantum electrodynamic corrections, Breit interaction and nuclear recoil effects are also included in the succeeding relativistic configuration interaction (RCI) calculations. The relativistic isotope shift (RIS4) programme is used to determine the mass and field shifts factors. Furthermore, the percentage uncertainty in the transition parameters and lifetimes is estimated. A detailed comparison of the present results with the corresponding values from the NIST database and other theoretical and experimental works, wherever available, has been done, and an excellent agreement is achieved. A large section of the results is reported for the first time in the present work.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"16 ","pages":"Article 100160"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49759541","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}

引用次数: 0

Free space continuous variable Quantum Key Distribution with discrete phases 具有离散相位的自由空间连续变量量子密钥分布

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100162

Anju Rani , Pooja Chandravanshi , Jayanth Ramakrishnan , Pravin Vaity , P. Madhusudhan , Tanya Sharma , Pranav Bhardwaj , Ayan Biswas , R.P. Singh

引用次数: 0

Accurate derivation of THG conversion efficiency in periodically poled nonlinear medium and optimizing conversion parameters 周期极化非线性介质中THG转换效率的精确推导及转换参数的优化

Physics Open Pub Date : 2023-07-01 DOI: 10.1016/j.physo.2023.100158

Muhammad Abdul Rahman, Nour Nasser, Moustafa Sayem El-Daher

{"title":"Accurate derivation of THG conversion efficiency in periodically poled nonlinear medium and optimizing conversion parameters","authors":"Muhammad Abdul Rahman, Nour Nasser, Moustafa Sayem El-Daher","doi":"10.1016/j.physo.2023.100158","DOIUrl":"10.1016/j.physo.2023.100158","url":null,"abstract":"<div><p>We have derived a novel equation to accurately predict the third harmonic generation (THG) conversion efficiency in hybrid periodically poled nonlinear medium. Our equation considers the general case that takes both depleted pump regime and phase mismatching cases, resulting in more precise predictions of efficiency. This level of accuracy is crucial for certain applications like high-power THG lasers. Moreover, accurate calculation of THG power density is essential to prevent exceeding the crystal damage threshold. We applied our equation on hybrid MgO:PPLN crystal to determine the optimal SHG region length corresponding to two different power densities, namely, <span><math><mrow><mn>0.25</mn></mrow></math></span> and <span><math><mrow><mn>0.5</mn><mrow><mrow><mi>M</mi><mi>W</mi></mrow><mo>/</mo><mrow><mi>c</mi><msup><mi>m</mi><mn>2</mn></msup></mrow></mrow></mrow></math></span>. The effect of crystal temperature on efficiency was also studies. Furthermore, a comparison between the derived equation and the commonly used nondepleted pump regime equation was performed. We found that the latter equation is significantly less accurate, particularly at high power densities, with the efficiency of the depleted pump regime being 50.6% less than nondepleted one. To demonstrate the effectiveness of the equation, our results were compared with experimental data, and we observed a good agreement between them.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"16 ","pages":"Article 100158"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46223080","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}

引用次数: 0

Gravitational lensing and missing mass 引力透镜效应和质量缺失

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100150

Saurya Das , Sourav Sur

引用次数: 0

General pseudo self-adjoint boundary conditions for a 1D KFG particle in a box 框内一维KFG粒子的一般伪自伴随边界条件

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100151

Salvatore De Vincenzo

{"title":"General pseudo self-adjoint boundary conditions for a 1D KFG particle in a box","authors":"Salvatore De Vincenzo","doi":"10.1016/j.physo.2023.100151","DOIUrl":"10.1016/j.physo.2023.100151","url":null,"abstract":"<div><p>We consider a 1D Klein–Fock–Gordon particle in a finite interval, or box. We construct for the first time the most general set of pseudo self-adjoint boundary conditions for the Hamiltonian operator that is present in the first order in time 1D Klein–Fock–Gordon wave equation, or the 1D Feshbach–Villars wave equation. We show that this set depends on four real parameters and can be written in terms of the one-component wavefunction for the second order in time 1D Klein–Fock–Gordon wave equation and its spatial derivative, both evaluated at the endpoints of the box. Certainly, we write the general set of pseudo self-adjoint boundary conditions also in terms of the two-component wavefunction for the 1D Feshbach–Villars wave equation and its spatial derivative, evaluated at the ends of the box; however, the set actually depends on these two column vectors each multiplied by the singular matrix that is present in the kinetic energy term of the Hamiltonian. As a consequence, we found that the two-component wavefunction for the 1D Feshbach–Villars equation and its spatial derivative do not necessarily satisfy the same boundary condition that these quantities satisfy when multiplied by the singular matrix. In any case, given a particular boundary condition for the one-component wavefunction of the standard 1D Klein–Fock–Gordon equation and using the pair of relations that arise from the very definition of the two-component wavefunction for the 1D Feshbach–Villars equation, the respective boundary condition for the latter wavefunction and its derivative can be obtained. Our results can be extended to the problem of a 1D Klein–Fock–Gordon particle moving on a real line with a point interaction (or a hole) at one point.</p></div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"15 ","pages":"Article 100151"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47138149","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}

引用次数: 0

Using optical systems to simulate topological systems in momentum space and measure their topological numbers 利用光学系统模拟动量空间中的拓扑系统并测量其拓扑数

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100145

Zhongcheng Feng, Jiansheng Wu

引用次数: 0