IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-08 DOI: 10.1007/s12043-024-02771-w

Simonas Draukšas, Vytautas Dūdėnas, Luís Lavoura

{"title":"Oblique corrections when (m_W ne m_Z cos {theta _W}) at tree level","authors":"Simonas Draukšas, Vytautas Dūdėnas, Luís Lavoura","doi":"10.1007/s12043-024-02771-w","DOIUrl":"10.1007/s12043-024-02771-w","url":null,"abstract":"<div>The parametrization of the oblique corrections through S, T, and U – later extended by V, W and X – is a convenient way of comparing the predictions for various electroweak observables at the one-loop level between the Standard Model and its extensions. That parametrization assumes that the extensions under consideration have ({SU(2)times U(1)}) gauge symmetry and the tree-level relation (m_W = m_Z cos {theta _W}) between the Weinberg angle and the gauge-boson masses. In models where that relation does not hold at the Lagrangian level, the parameter T is not ultraviolet-finite, making the parametrization inadequate. We present expressions that parametrize the difference of the various predictions of two models with (m_W ne m_Z cos {theta _W}) in terms of oblique parameters. The parameter T does not play a role in those expressions. Conveniently, they may be reached from the ones that were derived for models with tree-level (m_W = m_Z cos {theta _W}), by performing a simple substitution for T. We also discuss the difficulties in using oblique parameters when comparing a model with (m_W ne m_Z cos {theta _W}) to the Standard Model. Finally, we compute the relevant five oblique parameters S, U, V, W and X in the SM extended by both, hypercharge (Y=0) and (Y=1), triplet scalars.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141570049","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}

引用次数: 0

Energy and charge radii of Li isotopes in a two-body configuration 双体构型锂同位素的能量和电荷半径

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-04 DOI: 10.1007/s12043-024-02779-2

Nasrin Malekinezhad, Mohammadreza Shojaei, Cristian Massimi

引用次数: 0

Uncertain effects of thermal radiation and magnetic field in the micropolar fluid flow through porous channel walls with hybrid nanoparticles 热辐射和磁场在微极性流体流经多孔通道壁与混合纳米颗粒中的不确定效应

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-04 DOI: 10.1007/s12043-024-02758-7

Ajay Kumar, Ramakanta Meher

{"title":"Uncertain effects of thermal radiation and magnetic field in the micropolar fluid flow through porous channel walls with hybrid nanoparticles","authors":"Ajay Kumar, Ramakanta Meher","doi":"10.1007/s12043-024-02758-7","DOIUrl":"10.1007/s12043-024-02758-7","url":null,"abstract":"<div>This work considers a micropolar hybrid nanofluid flow through a resistive porous media between channel walls to study the uncertain effects of thermal radiation and magnetic field on the velocity and thermal profiles by considering distinctly shaped nanoparticles such as copper (Cu) and hybrid nanoparticles such as copper–alumina (Cu–Al(_{2})O(_{3})). Three different forms of the nanoparticles, spherical, cylindrical and blade are examined considering the flow’s heat radiation and magnetic field impact. \u0000Here, the volume fractions of nanoparticles are expressed with the triangular fuzzy number ranging from 0 to 2.5% to examine its uncertain effects on the velocity and thermal profiles by employing a double parameter-based homotopy approach. The homotopy analytical approach has proven its efficacy in approximating solutions to diverse nonlinear problems owing to its rapid solution convergence. The obtained results are validated with the available results in crisp cases, and a graphical with numerical illustration has been made to study the behaviour of the fuzzy velocity, microrotation, temperature and concentration profiles under the effect of distinct parameters. The findings of this study indicate that, despite micropolar effects and porosity, the heat transmission rate is improved in hybrid nanofluids and blade-shaped nanoparticles compared to cylindrical and spherical-shaped nanoparticles.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552359","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}

引用次数: 0

Monte Carlo solution of the reflected systems’ criticality problems with Anlı–Güngör, Inönü and tetra-anisotropic kernels for both fission and scattered neutrons 使用安勒-贡格尔、伊诺和四各向异性核对裂变中子和散裂中子的反射系统临界问题的蒙特卡洛解法

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-07-04 DOI: 10.1007/s12043-024-02781-8

Bahram R Maleki

{"title":"Monte Carlo solution of the reflected systems’ criticality problems with Anlı–Güngör, Inönü and tetra-anisotropic kernels for both fission and scattered neutrons","authors":"Bahram R Maleki","doi":"10.1007/s12043-024-02781-8","DOIUrl":"10.1007/s12043-024-02781-8","url":null,"abstract":"<div>Different deterministic solution methods are being used to solve the criticality problem of the reflected systems with different anisotropic behaviours for both fission neutrons and neutrons undergoing scattering. In the present study, the criticality problem is simulated using the developed Monte Carlo algorithm. Different angular distributions, such as Inönü, Anlı–Güngör and tetra-anisotropic kernels are taken into account. For each anisotropic kernel, the sampling method of the direction cosine of either newborn fission neutrons or scattered neutrons is presented by extracting the required probability distribution function (PDF). The simulation starts with an initial guess and following the presented procedure, the criticality thickness of the system is estimated with a certain convergence criterion. Different variance reduction methods, such as implicit capture, Russian-roulette and splitting, are also implemented to get more precise results with a reasonable computational time cost. The validity of the presented method is verified by comparing with the results of different deterministic methods. Finally, using an exact scattering function, the three considered kernels are compared with each other. It is seen that the tetra-anisotropic kernel is the best among the considered kernels.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552357","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}

引用次数: 0

Stability of dual solutions in aqueous Ti-alloy nanofluid with thermal radiation effect 具有热辐射效应的钛合金纳米流体水溶液中双重溶液的稳定性

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-06-27 DOI: 10.1007/s12043-024-02775-6

Har Lal Saran, C h RamReddy

{"title":"Stability of dual solutions in aqueous Ti-alloy nanofluid with thermal radiation effect","authors":"Har Lal Saran, C h RamReddy","doi":"10.1007/s12043-024-02775-6","DOIUrl":"10.1007/s12043-024-02775-6","url":null,"abstract":"<div>The current article has identified dual solutions and their stability for the Ti-alloy/water nanofluid over an exponentially shrinking sheet, while taking into consideration the presence of magnetic fields, radiation and thermal buoyancy forces. The Tiwari and Das model has been utilised to formulate mathematical equations, which have subsequently been transformed from partial differential equations to ordinary differential equations using suitable similarity transformations. The transformed equations have been solved using the shooting method incorporated with the Runge–Kutta technique. Through the application of these techniques, it has been ascertained that multiple solutions have emerged for this problem. To assess the stability of these solutions, the eigenvalue approach has been employed. The eigenvalue approach has revealed that only the first solution is physically viable in laboratory settings, while the second solution is not. The effects of radiation on temperature, skin friction, velocity and heat transfer rate have been elaborated upon in detail. Furthermore, flow separation points have been identified and the rationale behind the delay in flow separation has been expounded upon. Streamlined patterns have been drawn and explained to enhance our understanding of the fluid flow behaviour. Finally, it is worth noting that these types of studies have significant applications in the medical and aerospace industries.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529814","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}

引用次数: 0

Dissipative heat effects on the Jeffrey nanofluid flow through horizontal channels during a binary chemical reaction dynamics 二元化学反应动力学过程中杰弗里纳米流体流经水平通道时的耗散热效应

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-06-27 DOI: 10.1007/s12043-024-02785-4

S Acharya, Meenakshi Panda, B Nayak, S R Mishra

引用次数: 0

The classification of exact travelling wave solutions to two-component Dullin–Gottwald–Holm system 双分量杜林-戈特沃尔德-霍尔姆系统精确行波解的分类

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-06-27 DOI: 10.1007/s12043-024-02787-2

Lintao Guo, Hua Xin

引用次数: 0

Influence of copper doping on structural, morphological and optical properties of tin oxide (Sn1−xCuxO2−δ) 铜掺杂对氧化锡（Sn1-xCuxO2-δ）结构、形态和光学特性的影响

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-06-27 DOI: 10.1007/s12043-024-02778-3

Archana Verma, B Das

{"title":"Influence of copper doping on structural, morphological and optical properties of tin oxide (Sn1−xCuxO2−δ)","authors":"Archana Verma, B Das","doi":"10.1007/s12043-024-02778-3","DOIUrl":"10.1007/s12043-024-02778-3","url":null,"abstract":"<div>The primary goal of this paper is to study a few advantages of bulk nanoparticles of Cu-doped SnO2 using the solid-state reaction method. Many innovative methods were employed to evaluate the special tuning of the bandgap and other structural and morphological properties of the material. X-ray diffractometer (XRD) confirmed that tin oxide has a rutile-type tetragonal-shaped structure with space group P42(/)mnm. The average crystallite size was calculated which was found to increase from 53 to 80 nm by increasing the Cu-doping from x (=) 0 to x (=) 0.30. SEM images specified that nanoparticles are inhomogeneous and densely close to each other and the average particle size was found to be in the range of ~225–430 nm. Transmission electron microscopy (TEM) images showed the grains present in a few cubic and spherical shapes and grain size was increased (~20–90 nm) with doping of copper in the SnO2 lattice. UV–Vis spectroscopy showed that the band gap increased from 3.531 to 3.701 eV for pure SnO2 and Cu-doped SnO2, respectively. XPS identified the electronic state of Sn as well as Cu atoms as (4^{+}) and (2^{+}), respectively. Raman spectroscopy showed that only three vibrational modes, i.e., A1g, B2g and doubly degenerate Eg, exist in a sample.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141522205","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}

引用次数: 0

Doping properties in Co(_{3-x})Ni(_{x})O(_{4}), comparison between p-DFT and experimental values Co$_{3-x}$Ni$_{x}$O$$_{4}$$ 中的掺杂特性，p-DFT 值与实验值的比较

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-06-13 DOI: 10.1007/s12043-024-02772-9

C A Aguirre, P DÍaz, D. Laroze, M R Joya, J Barba-Ortega, A S Mosquera Polo

{"title":"Doping properties in Co(_{3-x})Ni(_{x})O(_{4}), comparison between p-DFT and experimental values","authors":"C A Aguirre, P DÍaz, D. Laroze, M R Joya, J Barba-Ortega, A S Mosquera Polo","doi":"10.1007/s12043-024-02772-9","DOIUrl":"10.1007/s12043-024-02772-9","url":null,"abstract":"<div>In the present work, we numerically and experimentally study the Co(_{3-x})Ni(_{x})O(_{4}) (spinel-like oxides) system. Using the perturbative density functional theory (p-DFT) method, we start the study from the homogeneous sample ((x=0)), obtaining the main electronic properties (band structure (BS), density of states (DOS), and Fermi surface (FS)). Subsequently, we doped (x) with Ni atoms in different proportions (0–7% respectively, taking 56 atoms as 100% and the percentage of doping, on this percentage). As we increase the doping ((xne 0)), we have found that the forbidden gap decreases and the Fermi energy (FE) decreases, causing the material to exhibit a transition phase for a particular doping value. In addition, we find that more bands are generated when the system is doped, which would be responsible for the phase transition. The data from the theoretical analysis carried out in this paper was compared with the experimental data of various widely accepted works. Some of the results, when compared with the information available from the experimental ones, show good agreement.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"98 3","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141346292","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}

引用次数: 0

Thermodynamics of one- and two-qubit quantum refrigerators interacting with squeezed baths: a comparative study 与挤压浴相互作用的一比特和二比特量子制冷器的热力学：比较研究

IF 1.9 4区物理与天体物理

Pramana Pub Date : 2024-06-07 DOI: 10.1007/s12043-024-02776-5

Ashutosh Kumar, Sourabh Lahiri

引用次数: 0

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