The European Physical Journal Plus最新文献_第9页

Ag doping enhancement of photoelectrochemical performance of ZnO nanoparticles Ag掺杂增强ZnO纳米粒子的光电化学性能

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-24 DOI: 10.1140/epjp/s13360-023-04374-7

M. Salem, A. Rached, S. Nasr, J. Salem, I. Massoudi, Y. Litaiem, M. Gaidi

{"title":"Ag doping enhancement of photoelectrochemical performance of ZnO nanoparticles","authors":"M. Salem, A. Rached, S. Nasr, J. Salem, I. Massoudi, Y. Litaiem, M. Gaidi","doi":"10.1140/epjp/s13360-023-04374-7","DOIUrl":"10.1140/epjp/s13360-023-04374-7","url":null,"abstract":"<div><p>In this paper, we report on co-precipitation and spin coating process to prepare pure and silver (Ag)-doped nanostructured zinc oxide thin layers, with different Ag concentrations up to 2 at.%. X-ray diffraction (XRD) technique was used to study the crystalline properties of prepared samples. XRD investigation as exhibiting a wurtzite-type hexagonal phase, and a decrease in crystallite size with increasing Ag doping level. On optical analysis, both transmission and photoluminescence measurements highlight a pronounced impact attributed to the introduction of Ag doping. The optical findings underscore a notable shift in the optical band gap, as evidenced by UV–Visible measurements, indicating a transition from 3.27 eV prior to doping to 3.22 eV following the incorporation of 2 at.% Ag within the ZnO matrix. Additionally, a comprehensive exploration of photoelectrochemical (PEC) sensing characteristics was conducted. It is worth noting that among the assorted photo-anodes encompassing diverse Ag-dopant concentrations, the ZnO film infused with 0.5 at.% Ag showcased remarkable attributes, displaying heightened responsiveness and the utmost level of photoconduction sensitivity.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"138 8","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45692506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Photoelectrorheological properties of polyimides with sulfo-acid and sodium salt sulfo-acid groups: a comparative study 磺酸基和钠盐磺酸基聚酰亚胺的光电流变性能比较研究

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-24 DOI: 10.1140/epjp/s13360-023-04383-6

Elena S. Kelbysheva, Alexander N. Danilin, Mariam G. Ezernitskaya, Nikolay A. Semenov

{"title":"Photoelectrorheological properties of polyimides with sulfo-acid and sodium salt sulfo-acid groups: a comparative study","authors":"Elena S. Kelbysheva, Alexander N. Danilin, Mariam G. Ezernitskaya, Nikolay A. Semenov","doi":"10.1140/epjp/s13360-023-04383-6","DOIUrl":"10.1140/epjp/s13360-023-04383-6","url":null,"abstract":"<div><p>The paper describes a new device that allows us to study the effect of ultraviolet irradiation on the electrorheological characteristics of new photosensitive materials based on colloidal polyimide systems containing SO<sub>3</sub>H (PI-I) and SO<sub>3</sub>Na (PI-II) groups. The samples were analyzed using rotational viscometry methods, and a significant effect of irradiation of the systems on the flow velocity and hence the viscosity of the medium and the electrorheological response was shown. At the same time, the dimensional and microrheological properties of colloidal polyimide systems in polar and nonpolar media under simultaneous ultraviolet irradiation and exposure to an electric field were monitored using IR spectroscopy and dynamic light scattering methods. The mobility and zeta potential of polyimide molecules were determined using a sensitive method of phase analysis of light scattering. It is shown that in almost all cases, irradiation of colloidal systems of polyimides led to the uncontrolled formation of larger particles, which decreased during the thermal reaction almost to the initial size, which indicates the stability of the studied systems to external influences (irradiation and electric current).</p><h3>Graphical abstract</h3>\u0000 <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\u0000 </div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"138 8","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46107969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Structure determination of Gen− (n = 4–30) clusters Gen−(n = 4-30)簇的结构测定

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-23 DOI: 10.1140/epjp/s13360-023-04376-5

Kai Wang, Chaoyong Wang, Wei Li

{"title":"Structure determination of Gen− (n = 4–30) clusters","authors":"Kai Wang, Chaoyong Wang, Wei Li","doi":"10.1140/epjp/s13360-023-04376-5","DOIUrl":"10.1140/epjp/s13360-023-04376-5","url":null,"abstract":"<div><p>Determining the structures of germanium clusters can assist in comprehending the origins of the structures and properties of germanium bulk. As a result, it can pave the way for designing semiconductor materials with exceptional properties. Herein, we investigated the structural evolution and electronic properties of germanium clusters Ge<sub><i>n</i></sub><sup>−</sup> (<i>n</i> = 4–30) at density functional theory (DFT) level. Low-lying isomers of these clusters have been globally searched by using a homemade genetic algorithm coupled with DFT calculations. The ground-state structures of all these Ge cluster anions have been identified by comparing the experimental and simulated photoelectron spectra (PES). In the studied size range of <i>n</i> = 4–30, the Ge clusters follow a simple growth pattern. From Ge<sub>4</sub><sup>−</sup> to Ge<sub>9</sub><sup>−</sup>, a nine-atom tricapped trigonal prism (TTP) is stepwisely formed. The resulting TTP unit is then capped with the remaining excess atoms in the size range of <i>n</i> = 10–17. Ge<sub>18</sub><sup>−</sup> to Ge<sub>30</sub><sup>−</sup> result from two TTP units by incorporation of additional adatoms into the waist. The vertical detachment energy (VDE) curve for Ge<sub><i>n</i></sub><sup>−</sup> displays a general increasing trend, while the HOMO–LUMO gap results are in an opposite trend. The average binding energies increase as the size increases, indicating that it is conducive to the formation of large clusters. It is found that sizes <i>n</i> = 7, 10, 13, 15 are the magic numbers.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"138 8","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42459986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 2

Hybrid relativistic and modified Toda lattice-type system: equivalent form, N-fold Darboux transformation and analytic solutions 混合相对论和修正Toda晶格型系统：等价形式、N次Darboux变换和解析解

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-23 DOI: 10.1140/epjp/s13360-023-04331-4

Yuan Shen, Bo Tian, Dan-Yu Yang, Tian-Yu Zhou

引用次数: 1

Coherent control of double-ring perfect optical vortex via hyper-Raman scattering in a Landau-quantized graphene 朗道量子化石墨烯中超拉曼散射对双环完美光学涡旋的相干控制

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-23 DOI: 10.1140/epjp/s13360-023-04389-0

Xu Deng, Tao Shui, Tong Zhang, Yi Song, Wen-Xing Yang

引用次数: 0

A new parametrization for bulk viscosity cosmology as extension of the (Lambda )CDM model 作为∧documentclass[12pt]｛minimum｝ usepackage｛amsmath｝ userpackage｛wasysym｝ use package｛amsfonts｝ user package｛amssymb｝ usapackage｛amsbsy｝usepackage{mathrsfs｝ upgradeek｝ setlength｛doddsidemargin｝｛-69pt｝ begin｛document｝的扩展的体粘度宇宙学的一个新参数化

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-23 DOI: 10.1140/epjp/s13360-023-04367-6

Gabriel Gómez, Guillermo Palma, Esteban González, Ángel Rincón, Norman Cruz

{"title":"A new parametrization for bulk viscosity cosmology as extension of the (Lambda )CDM model","authors":"Gabriel Gómez, Guillermo Palma, Esteban González, Ángel Rincón, Norman Cruz","doi":"10.1140/epjp/s13360-023-04367-6","DOIUrl":"10.1140/epjp/s13360-023-04367-6","url":null,"abstract":"<div><p>Bulk viscosity in cold dark matter is an appealing feature that introduces distinctive phenomenological effects in the cosmological setting as compared to the <span>(Lambda )</span>CDM model. Under this view, we propose a general parametrization of the bulk viscosity of the form <span>(xi sim H^{1-2s} rho _{m}^{s})</span>, Some advantages of this novel parametrization are: first, it allows to write the resulting equations of cosmological evolution in the form of an autonomous system for any value of <i>s</i>, so a general treatment of the fixed points and stability can be done, and second, the bulk viscosity effect is consistently handled so that it naturally turns off when matter density vanishes. As a main result we find, based on detailed dynamical system analysis, one-parameter family of de Sitter-like asymptotic solutions with non-vanishing bulk viscosity coefficient during different cosmological periods. Numerical computations are performed jointly along with analytical phase space analysis in order to assess more quantitatively the bulk viscosity effect on the cosmological background evolution. Finally, as a first contact with observation we derive constraints on the free parameters of some bulk viscosity models with specific <i>s</i>-exponents from Supernovae Ia and observations of the Hubble parameter, by performing a Bayesian statistical analysis thought the Markov Chain Monte Carlo method.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"138 8","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46027963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Combining SR-FTIR, SR-LEXRF and PIXE microscopies for residue analysis on Palaeolithic stone artefacts 结合SR-FTIR, SR-LEXRF和PIXE显微镜对旧石器时代石器制品进行残留分析

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-23 DOI: 10.1140/epjp/s13360-023-04320-7

C. Dominici, C. Stani, V. Bonanni, M. Rossini, I. Božičević Mihalić, G. Provatas, S. Fazinić, F. Boschin, A. Gianoncelli, L. Vaccari

{"title":"Combining SR-FTIR, SR-LEXRF and PIXE microscopies for residue analysis on Palaeolithic stone artefacts","authors":"C. Dominici, C. Stani, V. Bonanni, M. Rossini, I. Božičević Mihalić, G. Provatas, S. Fazinić, F. Boschin, A. Gianoncelli, L. Vaccari","doi":"10.1140/epjp/s13360-023-04320-7","DOIUrl":"10.1140/epjp/s13360-023-04320-7","url":null,"abstract":"<div><p>Residue analysis in the field of Palaeolithic studies represents a powerful source of information, as well as a challenging operation of deduction, based on the interpretation of what remains of organic and inorganic compounds that testify to the ancient use of lithic artefacts. The disposal of reliable methods for residue characterisation is thus essential in the approach to this discipline, along with the collection of comprehensive, high-quality data. In this paper, the development of a new analytical protocol is presented through the chemical characterisation of red residues coming from three lithic artefacts retrieved from the Upper Palaeolithic stratigraphic sequence of Grotta Paglicci (Apulia, Italy). The morphological description of each residue was followed by the application of an advanced set of complementary techniques (namely Synchrotron Radiation Fourier-Transform InfraRed microscopy, Synchrotron Radiation Low-Energy X-ray Fluorescence and Particle Induced X-ray Emission) to obtain the molecular and elemental composition. The results provided by this pilot study allowed the identification of various organic and inorganic fractions within the samples, proving the reliability and high sensitivity of our newly designed protocol in dealing with ancient residues.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"138 8","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43684742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Novel prediction of fluid forces on obstacle in a periodic flow regime using hybrid FEM-ANN simulations 基于混合有限元-神经网络模拟的周期流态中对障碍物的流体力预测

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-23 DOI: 10.1140/epjp/s13360-023-04225-5

Rashid Mahmood, Afraz Hussain Majeed, Hasan Shahzad, Ilyas Khan

{"title":"Novel prediction of fluid forces on obstacle in a periodic flow regime using hybrid FEM-ANN simulations","authors":"Rashid Mahmood, Afraz Hussain Majeed, Hasan Shahzad, Ilyas Khan","doi":"10.1140/epjp/s13360-023-04225-5","DOIUrl":"10.1140/epjp/s13360-023-04225-5","url":null,"abstract":"<div><p>A lot of computational resources are required for time-dependent CFD simulations for the accurate prediction of the quantities of interest. To circumvent such difficulties, an artificial neural network (ANN) has been coupled with CFD simulations. Training and validation datasets have been generated by CFD and then are fed through ANN with optimal number of neurons and inner layers. A well-known benchmark problem for incompressible flows, namely, the flow around cylinder has been considered for the hybrid CFD network. The mathematical formulations are based on nonstationary Navier–Stokes equations incorporating the viscosity through power-law fluid constitutive model. The underlying ANN model consists of 3 input layers, 2 output layers, and 10 hidden layers. The network has been trained through one of the most efficient backpropagation algorithms, namely, Levenberg–Marquardt (<i>LM</i>) algorithm that provides second-order training speed. The obtained finite element results for drag and lift coefficients have been validated with the ANN predicted values through statistical measures represented by mean square error (MSE) and the coefficient of determination (<i>R</i>). For all cases, we have obtained a higher predictivity for drag coefficient <span>(C_{D})</span> and lift coefficient <span>(C_{L})</span> as MSE values approached zero and <i>R</i> values found to be close to unity. The agreement between the CFD results and the data predicted from ANN determined via the correlations is within less than ± 5% errors. It is concluded that ANNs may help to reduce the computing time and other resources required for time-dependent simulations.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"138 8","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46029076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1

Entropy analysis of natural convection Jeffrey fluid flow through a vertical channel with an inclined magnetic field effect under Navier-slip conditions navier -滑移条件下自然对流Jeffrey流体在倾斜磁场作用下垂直通道内流动的熵分析

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-23 DOI: 10.1140/epjp/s13360-023-04357-8

K. Kaladhar, Ravi Mahla

引用次数: 0

Bioconvection in Eyring–Powell fluid with composite features of variable viscosity and motile microorganism density 具有变粘度和移动微生物密度复合特征的Eyring-Powell流体中的生物对流

IF 3.4 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2023-08-23 DOI: 10.1140/epjp/s13360-023-04361-y

Mojeed T. Akolade, John O. Olabode, Yusuf O. Tijani, Tayyaba Akhtar

{"title":"Bioconvection in Eyring–Powell fluid with composite features of variable viscosity and motile microorganism density","authors":"Mojeed T. Akolade, John O. Olabode, Yusuf O. Tijani, Tayyaba Akhtar","doi":"10.1140/epjp/s13360-023-04361-y","DOIUrl":"10.1140/epjp/s13360-023-04361-y","url":null,"abstract":"<div><p>The yield stress in non-Newtonian fluids is intriguing. Their behaviours and properties transform under different conditions, such as pressure, temperature, concentration, and motile density. Consider a fascinating biological system where temperature differences ignite microorganism activity and production rates, explaining the need for refrigeration and similar processes. As such, the current model breaks free from constant assumptions about fluid properties and mathematically predicts changes in thermal conductivity and mass diffusivity, while viscosity and motile variation are modelled as a composite function of microorganism density and fluid temperature. The bio-convection phenomenon arises when microorganisms self-propel the Eyring–Powell fluid past a three-dimensional Riga plate, driven by stretching velocity. It is an intriguing interplay. To gain deeper insights into the flow model parameters, the weighted residual method (Galerkin approach) is employed to solve the model systems while the findings are presented through tables and graphs. Improving the temperature- and microorganism-dependent variable viscosity significantly decreases the fluid velocities and motile density movement but enhances the temperature and fluid concentration. Conversely, the response of temperature- and microorganism-dependent variable motile density variation energizes the flow momentum and decreases the fluid concentration considerably. For the variable viscosity parameter, <span>(xi _1 in [0,0.5])</span>, the skin drag force and local motile number increase by 22.6% and 5.98%, respectively. Additionally, 100% increment in variable motile density number downsized the skin friction by 289.36% while the local motile density appreciates by 18.90%. In general, the results obtained here are found to be applicable in biophysics, environmental science, and engineering systems.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"138 8","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47099526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1