Annals of West University of Timisoara Physics最新文献_第2页

Bias-Correction of Diffuse Solar Irradiance Modeled Through Parametric Models 通过参数模型模拟的漫射太阳辐照度的偏差校正

Annals of West University of Timisoara Physics Pub Date : 2022-09-19 DOI: 10.2478/awutp-2022-0007

Robert Blaga

引用次数: 0

Elaboration and Characterization of the Mechanical Properties and Moisture Buffer Value of a Composite Based on Lime and Date Palm Petiole Fibre 酸橙-枣叶柄纤维复合材料力学性能及湿缓冲性能的研究

Annals of West University of Timisoara Physics Pub Date : 2022-08-23 DOI: 10.2478/awutp-2022-0005

A. Gharbi, A. Zeddouri, A. Gherfi, Kamal Bouchemaa

{"title":"Elaboration and Characterization of the Mechanical Properties and Moisture Buffer Value of a Composite Based on Lime and Date Palm Petiole Fibre","authors":"A. Gharbi, A. Zeddouri, A. Gherfi, Kamal Bouchemaa","doi":"10.2478/awutp-2022-0005","DOIUrl":"https://doi.org/10.2478/awutp-2022-0005","url":null,"abstract":"Abstract This study concerns a new ecological material, bio-sourced and with reduced environmental impact. The material in question is a composite made from date palm fibers and lime. For the development of this material, we were inspired by the techniques used for the manufacture of hemp concrete. The latter is widely used especially in France for the thermal insulation of buildings. The idea is to design an insulation material from the natural resources of the southern Algerian region. The material made is a lightweight concrete that could provide both thermal and acoustic insulation. By its porous morphology, it also has the ability to absorb water vapor when it is in an environment with high relative humidity and to release the vapor if the environment is dry. It could therefore play the role of a water regulator. Experimental investigations revealed interesting mechanical and hydrous properties. Measurements of the moisture buffer value (MBV) reveal that according to the current standard, the material is classified between good and excellent. As regards the mechanical strength, the material produced has an acceptable compressive strength.","PeriodicalId":31012,"journal":{"name":"Annals of West University of Timisoara Physics","volume":"1 1","pages":"68 - 81"},"PeriodicalIF":0.0,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74965546","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

Elastic Constants of Tetragonal Cu2ZnSnS4 Semiconductor: AB-Initio Calculation 方形Cu2ZnSnS4半导体的弹性常数:AB-Initio计算

Annals of West University of Timisoara Physics Pub Date : 2022-06-19 DOI: 10.2478/awutp-2022-0004

L. Boutahar, A. Benamrani, Z. Er, N. Bioud, Z. Rouabah

{"title":"Elastic Constants of Tetragonal Cu2ZnSnS4 Semiconductor: AB-Initio Calculation","authors":"L. Boutahar, A. Benamrani, Z. Er, N. Bioud, Z. Rouabah","doi":"10.2478/awutp-2022-0004","DOIUrl":"https://doi.org/10.2478/awutp-2022-0004","url":null,"abstract":"Abstract In this work, an ab-initio calculation is used to investigate the elastic constants and some other mechanical and thermal parameters of tetragonal Cu2ZnSnS4 (CZTS) quaternary semiconducting bulk material in Kesterite (KS) and Stannite (ST) phases. The Quantum Espresso code within the Ultra Soft pseudo potentials (USPP) and the local density approximation (LDA) approach were used in the calculation. Firstly,, studies are started with the prediction of the elastic stiffness constants Cij and the normal and shear anisotropy factors. Then some other mechanical moduli, especially the isotropic bulk modulus B, the shear modulus G, the Young modulus E, the Poisson’s ratio ν, and the Pugh’s criteria (G/B) are delivered. The analysis of the mechanical stability criteria at equilibrium shows that our elastic stiffness constants Cij of CZTS material obey all the stability conditions. Additionally, some other parameters of the CZTS semiconductor, especially: the Vickers hardness HV, the sound velocity, the Debye temperature θD and the melting temperature Tm were also calculated. The obtained values of the elastic constants Cij and other mechanical and thermal parameters agree well with experimental and other theoretical results of the literature. The Debye temperature θD of the KS phase was found at around 332.7 K, and that of the stannite phase was found equal to 329.1 K, respectively.","PeriodicalId":31012,"journal":{"name":"Annals of West University of Timisoara Physics","volume":"2 1","pages":"55 - 67"},"PeriodicalIF":0.0,"publicationDate":"2022-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78231474","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: 3

Structural, Electronic, Elastic, Mechanical, Optical and Thermoelectric Properties of the Chalcogenide Double Perovskites A2GaNbS6 (A = Ca, Sr and Ba): Insights From Density Functional Theory Calculations 硫系双钙钛矿A2GaNbS6 (A = Ca, Sr和Ba)的结构、电子、弹性、机械、光学和热电性质:来自密度泛函理论计算的见解

Annals of West University of Timisoara Physics Pub Date : 2022-05-28 DOI: 10.2478/awutp-2022-0003

H. Bendjilali, A. Chahed, H. Rozale, M. Bousahla, Y. A. Khachai

{"title":"Structural, Electronic, Elastic, Mechanical, Optical and Thermoelectric Properties of the Chalcogenide Double Perovskites A2GaNbS6 (A = Ca, Sr and Ba): Insights From Density Functional Theory Calculations","authors":"H. Bendjilali, A. Chahed, H. Rozale, M. Bousahla, Y. A. Khachai","doi":"10.2478/awutp-2022-0003","DOIUrl":"https://doi.org/10.2478/awutp-2022-0003","url":null,"abstract":"Abstract Recently, the lead-free double perovskite compounds have been evinced to be promising candidate for thermoelectric and optoelectronic technologies. In this paper; we have probed a theoretical works on the different physical properties: Structural, electronic, elastic, optical and thermoelectrical properties of the chalcogenide double perovskites A2GaNbS6 (A=Ca, Sr and Ba) within the instructions of density functional theory. The calculations have incorporated using the full potential linearized augmented plane waves (FP-LAPW) method within gradient generalized approximation (GGA) and the modified Becke-Johnson potential (mBJ) to describe the exchange-correlation potential as embodied in the WIEN2K code. The computed structural results show that the non-magnetic structure state is energetically the most stable structure in the cubic Fm3̄m (225) configuration, also the elastic and mechanical properties indicate that A2GaNbS6 (A=Ca, Sr and Ba) have a ductile nature. According to the electronic plots the three compounds have a semiconducting behavior with indirect (pseudo-direct) band gap of 1.21, 1.28 and 1.32 eV. Important optical responses of studied chalcogenide double perovskites are found in the visible and ultraviolet energy ranges. Finally, the thermoelectric effectiveness of the three compounds have been probed by computing parameters like Seebeck coefficient, electrical conductivity, thermal conductivity and figure of merit with semi-classical Boltzmann theory and constant relaxation time approximation as implemented in BoltzTrap code, the obtained results show that the chalcogenide double perovskites could be a good candidate for thermoelectric applications.","PeriodicalId":31012,"journal":{"name":"Annals of West University of Timisoara Physics","volume":"16 1","pages":"37 - 54"},"PeriodicalIF":0.0,"publicationDate":"2022-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87336942","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: 3

Theoretical Prediction of Mechanical Properties of BxAl1−xSb Ternary Semiconducting Alloys BxAl1−xSb三元半导体合金力学性能的理论预测

Annals of West University of Timisoara Physics Pub Date : 2022-04-27 DOI: 10.2478/awutp-2022-0002

R. Mezouar, N. Bioud, H. Rekab-Djabri, N. Beloufa, Z. Rouabah

{"title":"Theoretical Prediction of Mechanical Properties of BxAl1−xSb Ternary Semiconducting Alloys","authors":"R. Mezouar, N. Bioud, H. Rekab-Djabri, N. Beloufa, Z. Rouabah","doi":"10.2478/awutp-2022-0002","DOIUrl":"https://doi.org/10.2478/awutp-2022-0002","url":null,"abstract":"Abstract The present work aims to predict the elastic constants and other significant properties of ordered BxAl1-xSb (0 ≤ x ≤ 1) ternary semiconducting alloys. We report the initial results of the elastic stiffness constants, the bulk modulus, the aggregate shear modulus, the Cauchy ratio, the aggregate Young’s modulus, the Born ratio, the isotropy factor, the fracture toughness and the longitudinal, transverse and average sound velocities. The Debye temperature and the melting point were also predicted using two different empirical expressions. Except the Cauchy ratio, which decreases with enhancing boron content x, all other physical quantities of BxAl1-xSb alloys increase gradually and monotonically with increasing of boron concentration x in the range 0-1. Our obtained data for BSb and AlSb binary semiconducting compounds are discussed and analyzed in comparison with experimental and other theoretical values of the literature. Generally, our data for BSb and AlSb are in good agreement with other results reported previously in literature. Indeed, our obtained value (335.82 K) of the Debye temperature for AlSb compound overestimates the result (328.6 K) reported by Salehi et al. by around 2.03%, while that (1520 K) of the melting point for BSb overestimates the result (1500 K) reported recently by Bioud et al. by around 1.34%. Furthermore, to the best of our knowledge, no theoretical or experimental data were reported in the literature on the elastic constants and other properties for BxAl1-xSb alloys to compare with them.","PeriodicalId":31012,"journal":{"name":"Annals of West University of Timisoara Physics","volume":"33 1","pages":"22 - 36"},"PeriodicalIF":0.0,"publicationDate":"2022-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87964052","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: 1

A Comparative Study of Un-Doped ZnO and in Doping ZnO Thin Films with Various Concentrations, Subjected to Appropriate UHV Treatment and Characterized by Sensitive Spectroscopy Techniques XPS, AES, Reels and PL 未掺杂ZnO与掺杂不同浓度ZnO薄膜的比较研究，经过适当的UHV处理，并通过XPS, AES, Reels和PL等敏感光谱技术进行了表征

Annals of West University of Timisoara Physics Pub Date : 2022-03-12 DOI: 10.2478/awutp-2022-0001

K. B. Bensassi, Edhawya Hameurlaine, M. Guezzoul, M. Bouslama, Abdallah Ouerdane, A. Belaidi, Amira Derri, M. Bedrouni, A. Baizid, M. Abdelkrim, B. Kharoubi

{"title":"A Comparative Study of Un-Doped ZnO and in Doping ZnO Thin Films with Various Concentrations, Subjected to Appropriate UHV Treatment and Characterized by Sensitive Spectroscopy Techniques XPS, AES, Reels and PL","authors":"K. B. Bensassi, Edhawya Hameurlaine, M. Guezzoul, M. Bouslama, Abdallah Ouerdane, A. Belaidi, Amira Derri, M. Bedrouni, A. Baizid, M. Abdelkrim, B. Kharoubi","doi":"10.2478/awutp-2022-0001","DOIUrl":"https://doi.org/10.2478/awutp-2022-0001","url":null,"abstract":"Abstract In this study, we use complementary and sensitive experimental techniques XPS (X-rays Photoelectron Spectroscopy), AES (Auger Electron Spectroscopy, REELS (Reflection Electron Energy-Loss Spectroscopy) and PL (photoluminescence) to investigate and compare the chemical, structure, electronic and optical properties of Un-doped ZnO (UZO) and Indium-doped ZnO (IZO) (4% In; 6% In) thin films. Spray method is used for the growth of these thin films on Si substrate. A treatment process UHV (Ultra-High -Vacuum: Ar+ sputtering followed by checked successive heating until 650°C) is performed. XPS and AES results allow to confirm the clean state of samples and the incorporation of indium into the ZnO matrix to form chemical species of (In-O-Zn) type. The recorded REELS spectra at different primary energies and the PL measurements justify that the UHV treatment plays an important role to improve the physical structure of IZO (6% In).","PeriodicalId":31012,"journal":{"name":"Annals of West University of Timisoara Physics","volume":"12 11 1","pages":"1 - 21"},"PeriodicalIF":0.0,"publicationDate":"2022-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87691190","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: 1

Investigation of the Temperature on the Thin Layers of Cobalt Oxide Produced by the Spray Pyrolysis Method Using a Solar Oven 利用太阳炉对喷雾热解法制备氧化钴薄层温度的研究

Annals of West University of Timisoara Physics Pub Date : 2021-12-01 DOI: 10.2478/awutp-2021-0012

A. Gharbi, S. Benramache, Lahcen Fella, Aziez Zedouri

{"title":"Investigation of the Temperature on the Thin Layers of Cobalt Oxide Produced by the Spray Pyrolysis Method Using a Solar Oven","authors":"A. Gharbi, S. Benramache, Lahcen Fella, Aziez Zedouri","doi":"10.2478/awutp-2021-0012","DOIUrl":"https://doi.org/10.2478/awutp-2021-0012","url":null,"abstract":"Abstract Thin films of cobalt oxide (Co3O4) were prepared on glass substrates by the spray pyrolysis method using a solar concentrator (oven) manufactured in our laboratory. We used different processing temperatures (300° C, 350° C and 400° C). The structural, optical and electrical properties of the different samples were analyzed by X-ray diffraction (XRD), UV-Visible spectroscopy and the Hall effect measurement system. X-ray diffraction observations revealed that cubic crystals are created in all films produced, and the film structure is that of a single phase created with preferential orientation along the (311) axis in films at low temperatures, and the axis (111) for high temperatures. The grain sizes of our products vary between (22.62nm and 66.19nm), depending on the processing temperature. The optical band gap of the crystals obtained was measured. The results of the optical forbidden bands of the crystals obtained, indicated two bands of the values for each element (Eg1 and Eg2). We observed that the values of the effective optical forbidden bands increase by 2.547eV and 3.0731eV with the increase in the production temperature., In addition the film produced experiences a decrease in the Urbach parameters which vary between 162.20meV and 360.81meV depending on the increase in production temperatures. Finally, the films produced have electrical conductivity values of (1.090 [(Ω.cm)−1] to 1.853 [(Ω.cm)−1] and electrical resistivity values of 1.431 (Ω.cm) at 1.853 (Ω.cm), depending on the variation in the production temperature.","PeriodicalId":31012,"journal":{"name":"Annals of West University of Timisoara Physics","volume":"28 1","pages":"163 - 176"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75214586","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

Retraction of: Hamada Khelifa, Djaafri Tayeb - Ferromagnetic half-metal for spintronic applications: Ab-initio calculation. - Annals of West University of Timisoara, Vol. 63, 2020, No. 1, pp. 14-25 (DOI: 10.2478/awutp-2021-0002). Hamada Khelifa, Djaafri Tayeb -自旋电子应用的铁磁半金属:从头计算。-蒂米什瓦拉西部大学年鉴，卷63,2020,No. 1, pp. 14-25 (DOI: 10.2478/awutp-2021-0002)。

Annals of West University of Timisoara Physics Pub Date : 2021-12-01 DOI: 10.2478/awutp-2021-0013

引用次数: 0

Spectral Characteristics of Solar Radiation in Timisoara, Romania 罗马尼亚蒂米什瓦拉太阳辐射的光谱特征

Annals of West University of Timisoara Physics Pub Date : 2021-12-01 DOI: 10.2478/awutp-2021-0011

Sergiu Hațegan, M. Paulescu

引用次数: 0

Scattering of Fermions by a Magnetic Dipole Field 磁偶极子场对费米子的散射

Annals of West University of Timisoara Physics Pub Date : 2021-11-20 DOI: 10.2478/awutp-2021-0010

Sergiu Hațegan, Cosmin Crucean

引用次数: 0