European Physical Journal-applied Physics最新文献_第6页

The activation energy U(T,B) in high temperature superconductor 高温超导体的活化能U(T,B)

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-11-01 DOI: 10.1051/epjap/2020200223

A. Labrag, M. Bghour, Ahmed Abou El Hassan, Habiba El Hamidi, A. Taoufik, Said Laasri

{"title":"The activation energy U(T,B) in high temperature superconductor","authors":"A. Labrag, M. Bghour, Ahmed Abou El Hassan, Habiba El Hamidi, A. Taoufik, Said Laasri","doi":"10.1051/epjap/2020200223","DOIUrl":"https://doi.org/10.1051/epjap/2020200223","url":null,"abstract":"It is reported in this paper on the thermally assisted flux flow in epitaxial YBa2 Cu3 O7-δ deposited by Laser ablation method on the SrTiO3 substrate. The resistivity measurements ρ (T , B ) of the sample under various values of the magnetic field up to 14T in directions B ∥ab-plane and B ∥c -axis with a dc weak transport current density were investigated in order to determine the activation energy and then understand the vortex dynamic phenomena and therefore deduce the vortex phase diagram of this material. The apparent activation energy U 0 (B ) calculated using an Arrhenius relation. The measured results of the resistivity were then adjusted to the modified thermally assisted flux flow model in order to account for the temperature-field dependence of the activation energy U (T , B ). The obtained values from the thermally assisted activation energy, exhibit a behavior similar to the one showed with the Arrhenius model, albeit larger than the apparent activation energy with ∼1.5 order on magnitude for both cases of the magnetic field directions. The vortex glass model was also used to obtain the vortex-glass transition temperature from the linear fitting of [d ln ρ /dT ] −1 plots. In the course of this work thanks to the resistivity measurements the upper critical magnetic field H c 2 (T ), the irreversibility line H irr (T ) and the crossover field H CrossOver (T ) were located. These three parameters allowed us to establish a phase diagram of the studied material where limits of each vortex phase are sketched in order to optimize its applicability as a practical high temperature superconductor used for diverse purposes.","PeriodicalId":12228,"journal":{"name":"European Physical Journal-applied Physics","volume":"40 1","pages":"20601"},"PeriodicalIF":1.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79875371","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: 5

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation 用于产生太赫兹辐射的热电偶阵列复合左/右传输线

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-11-01 DOI: 10.1051/epjap/2020200208

Behrokh Beiranvand, A. Sobolev, A. V. Kudryashov

{"title":"Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation","authors":"Behrokh Beiranvand, A. Sobolev, A. V. Kudryashov","doi":"10.1051/epjap/2020200208","DOIUrl":"https://doi.org/10.1051/epjap/2020200208","url":null,"abstract":"We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.","PeriodicalId":12228,"journal":{"name":"European Physical Journal-applied Physics","volume":"1 1","pages":"20502"},"PeriodicalIF":1.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82401513","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: 2

Modification of optical properties of PC-PBT/Cr2O3 and PC-PBT/CdS nanocomposites by gamma irradiation γ辐照对PC-PBT/Cr2O3和PC-PBT/CdS纳米复合材料光学性能的影响

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-11-01 DOI: 10.1051/epjap/2020200201

K. Benthami, M. Barakat, S. Nouh

{"title":"Modification of optical properties of PC-PBT/Cr2O3 and PC-PBT/CdS nanocomposites by gamma irradiation","authors":"K. Benthami, M. Barakat, S. Nouh","doi":"10.1051/epjap/2020200201","DOIUrl":"https://doi.org/10.1051/epjap/2020200201","url":null,"abstract":"Nanocomposite (NCP) films of polycarbonate-polybutylene terephthalate (PC-PBT) blend as a host material to Cr2 O3 and CdS nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Samples from the PC-PBT/Cr2 O3 and PC-PBT/CdS NCPs were irradiated using different doses (20–110 kGy) of γ radiation. The induced modifications in the optical properties of the γ irradiated NCPs have been studied as a function of γ dose using UV Vis spectroscopy and CIE color difference method. Optical dielectric loss and Tauc's model were used to estimate the optical band gaps of the NCP films and to identify the types of electronic transition. The value of optical band gap energy of PC-PBT/Cr2 O3 NCP was reduced from 3.23 to 3.06 upon γ irradiation up to 110 kGy, while it decreased from 4.26 to 4.14 eV for PC-PBT/CdS NCP, indicating the growth of disordered phase in both NCPs. This was accompanied by a rise in the refractive index for both the PC-PBT/Cr2 O3 and PC-PBT/CdS NCP films, leading to an enhancement in their isotropic nature. The Cr2 O3 NPs were found to be more effective in changing the band gap energy and refractive index due to the presence of excess oxygen atoms that help with the oxygen atoms of the carbonyl group in increasing the chance of covalent bonds formation between the NPs and the PC-PBT blend. Moreover, the color intensity, ΔE has been computed; results show that both the two synthesized NCPs have a response to color alteration by γ irradiation, but the PC-PBT/Cr2 O3 has a more response since the values of ΔE achieved a significant color difference >5 which is an acceptable match in commercial reproduction on printing presses. According to the resulting enhancement in the optical characteristics of the developed NCPs, they can be a suitable candidate as activate materials in optoelectronic devices, or shielding sheets for solar cells.","PeriodicalId":12228,"journal":{"name":"European Physical Journal-applied Physics","volume":"3 1","pages":"20402"},"PeriodicalIF":1.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90202065","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: 7

Modelling of composite materials energy by fiber bundle model 基于纤维束模型的复合材料能量建模

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-10-01 DOI: 10.1051/epjap/2020200179

S. Boufass, A. Hader, M. Tanasehte, H. Sbiaai, I. Achik, Y. Boughaleb

引用次数: 6

Structural, thermal and dielectric properties of Pb(Mg1/3Nb2/3)1‑x TixO3 ceramics at morphotropic phase boundary Pb(Mg1/3Nb2/3)1‑x TixO3陶瓷在致晶相界面上的结构、热性能和介电性能

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-10-01 DOI: 10.1051/epjap/2020200171

A. Alaoui-Belghiti, Y. Tabbai, M. Rkhis, S. Laasri, H. Lifi, A. Laghzizil, K. Strzałkowski, A. Hajjaji

引用次数: 6

Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite MCl (M = Na, K)加入对橄榄石显微组织和电导率的影响

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-10-01 DOI: 10.1051/epjap/2020200161

Saloua El Asri, H. Ahamdane, L. Hajji, M. Hadri, Moulay Ahmed El Idrissi Raghni, M. Mansori

{"title":"Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite","authors":"Saloua El Asri, H. Ahamdane, L. Hajji, M. Hadri, Moulay Ahmed El Idrissi Raghni, M. Mansori","doi":"10.1051/epjap/2020200161","DOIUrl":"https://doi.org/10.1051/epjap/2020200161","url":null,"abstract":"Forsterite single phase powder Mg2 SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2 SiO4 . The formation of forsterite started at 680–740 °C and at 630–700 °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.","PeriodicalId":12228,"journal":{"name":"European Physical Journal-applied Physics","volume":"8 1","pages":"10901"},"PeriodicalIF":1.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81373352","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: 2

Modeling the dynamic behavior of laminated steels using a Fourier-based approach 用基于傅里叶的方法模拟层合钢的动态行为

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-10-01 DOI: 10.1051/epjap/2020200020

R. Zeinali, D. Krop, E. Lomonova

{"title":"Modeling the dynamic behavior of laminated steels using a Fourier-based approach","authors":"R. Zeinali, D. Krop, E. Lomonova","doi":"10.1051/epjap/2020200020","DOIUrl":"https://doi.org/10.1051/epjap/2020200020","url":null,"abstract":"A new magneto-dynamic model is proposed to approximate the dynamic hysteresis effect in laminated steels considering the static hysteresis, eddy-current field, and excess field. An accurate congruency-based hysteresis model is used to predict the static hysteresis field. The eddy-current is determined from the 1D diffusion equation and the well-known Bertotti empirical equation is utilized to model the excess-field effect. The dynamic lamination model obtained from coupling three field components is solved using a Fourier-based approach. In this approach, the flux density across the lamination thickness is approximated by a cosine-based Fourier series. The coefficients of the Fourier series are determined by solving a system of nonlinear equations through an iterative procedure. Owing to the employed congruency-based static hysteresis model, the proposed magneto-dynamic model offers high accuracy for arbitrary magnetization regimes. To validate the model accuracy, the model results are compared with sinusoidal and multi-harmonic measurements. The comparison shows that the proposed model predicts the dynamic hysteresis phenomenon in laminated steels with a relative energy error of less than 7%.","PeriodicalId":12228,"journal":{"name":"European Physical Journal-applied Physics","volume":"11 1","pages":"10905"},"PeriodicalIF":1.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89477024","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: 2

The temperature dependence of the work function of oxide electrodes in fluorescent lamps 荧光灯中氧化物电极功函数的温度依赖性

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-10-01 DOI: 10.1051/epjap/2020190363

R. Langer, R. Tidecks

引用次数: 0

Experimental investigation of nanoparticles distribution mechanisms and deposition patterns during nanofluid droplet evaporation 纳米液滴蒸发过程中纳米颗粒分布机理及沉积模式的实验研究

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-10-01 DOI: 10.1051/epjap/2020200168

B. Liu, Wang Shengwei, Lin Chai, G. E. Achkar, Aiqiang Chen, P. Theodorakis

引用次数: 4

On the target surface temperature during dc magnetron sputtering 直流磁控溅射过程中靶表面温度的变化

IF 1 4区物理与天体物理

European Physical Journal-applied Physics Pub Date : 2020-10-01 DOI: 10.1051/epjap/2020200098

L. Shaginyan, V. Shaginyan, A. Kuzmichev, M. Mironov

{"title":"On the target surface temperature during dc magnetron sputtering","authors":"L. Shaginyan, V. Shaginyan, A. Kuzmichev, M. Mironov","doi":"10.1051/epjap/2020200098","DOIUrl":"https://doi.org/10.1051/epjap/2020200098","url":null,"abstract":"New simple method for target surface temperature (TST) measurements is successfully developed and described in detail. Along with temperature measurements we measured also the emissivity of each of targets by the method specially developed for this aim. The measurements demonstrate that the surface temperature of the targets prepared from Cu, Mo, Nb discs may substantially (up to ∼300 °C) exceed the temperature of the volume of the target. The definition of a “target surface temperature” is given. It is supposed that the thickness of the surface layer that appears on a target subjected to the ion bombardment is equal or close to the penetration depth of ions bombarding the target. The physical model explaining the formation of the surface layer is suggested. The main idea of the model is that the Ar ions bombarding the target may effectively transfer their kinetic energy mostly to the ionic subsystem rather than to the electron subsystem of a target. Due to very low mobility of metal ions within the layer the thermal conductivity of the layer is substantially lower compared to the rest target volume. As a result the temperature of the layer is higher than that of the rest part of the target.","PeriodicalId":12228,"journal":{"name":"European Physical Journal-applied Physics","volume":"2 1","pages":"10801"},"PeriodicalIF":1.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78575901","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: 3