检索结果-南通市图书馆

Electronic Band Structure and Optical Parameters of Spinel SnMg_(2)O_(4) by Modified Becke–Johnson Potential

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第10期29卷 193-197页

作者： masood yousaf M.A.Saeed Ahmad Radzi Mat Isa Amiruddin Shaari H.A.Rahnamaye Aliabad Physics Department Faculty of ScienceUniversiti Teknologi MalaysiaSkudai-81310JohorMalaysia Department of Physics Hakim Sabzevari UniversityIran

The electronic band structure and optical parameters of SnMg_(2)O_(4) are investigated by the first-principles technique based on a new potential approximation known as modified Becke–Johnson(mBJ).The direct band gap values by LDA,GGA and EV-GGA are underestimated significantly as compared to mBJ-GGA,which generally provides the results comparable to the experimental ***,the present band gap value(4.85 eV)using mBJ-GGA is greatly enhanced to the previous value by EV-GGA(2.823 eV).The optical parametric quantities(dielectric constant,index of refraction,reflectivity,optical conductivity and absorption coefficient)relying on the band structure are presented and *** first critical point(optical absorption's edge)in SnMg_(2)O_(4) occurs at about 4.85 eV.A strong absorption region is observed,extending between 5.4 eV to 25.0 *** SnMg_(2)O_(4),static dielectric constantε1(0),static refractive index n(0),and the magnitude of the coefficient of reflectivity at zero frequency R(0)are 2.296,1.515 and 0.0419,*** optoelectronic properties indicate that this material can be successfully used in optical devices.

关键词： absorption reflectivity dielectric

Effect of layer sliding on the interfacial electronic properties of intercalated silicene/indium selenide van der Waals heterostructure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2022年第3期74卷 112-118页

作者： masood yousaf M W Younis Ahmed S Jbara M Junaid Iqbal Khan G Murtaza M A Saeed Department of Physics Division of Science and TechnologyUniversity of EducationLahore54770Pakistan Department of Chemistry University of Management and TechnologyC-IIJohar TownLahore54770Pakistan Mathematics Department College of Education for Pure ScienceAl-Muthanna UniversitySamawah66001Iraq Laboratory of Theoretical and Experimental Physics Department of PhysicsBahauddin Zakariya UniversityMultan60800Pakistan Materials Modelling Lab Department of PhysicsIslamia College PeshawarKPPakistan Department of Mathematics&Natural Sciences Prince Mohammad Bin Fahd UniversityP.O.Box 1664Alkhobar 31952Saudi Arabia

Methods capable of tuning the properties of van der Waals(vdW)layered materials in a controlled and reversible manner are highly *** electronic properties of two-dimensional vdW heterostructure consisting of silicene and indium selenide(InSe)have been calculated using density functional theory-based computational ***,in order to vary the aforementioned properties,silicene is slid over a InSe layer in the presence of Li *** intercalation of the heterostructure,the buckling parameter associated with the corrugation of silicene decreases from 0.44A to 0.36A,whereas the InSe structure remains *** energy scans reveal a significant increase in the sliding energy barrier for the case of intercalated heterostructure as compared with the unintercalated *** sliding of the silicene encounters the maximum energy barrier of 0.14 *** analysis shows the noteworthy differences between calculated in-plane and out-of-plane part of dielectric function.A variation of the planar average charge density difference,dipole charge transfer and dipole moment have been discussed to elucidate the usability spectrum of the *** employed approach based on intercalation and layer sliding can be effectively utilized for obtaining next-generation multifunctional devices.

关键词： vdW heterostructure intercalation tuning of properties layer sliding interfacial electronic properties

An Insight into the Structural, Electronic and Transport Characteristics of XIn_(2)S_(4) (X = Zn, Hg) Thiospinels using a Highly Accurate All-Electron FP-LAPW+Lo Method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第7期30卷 205-209页

作者： masood yousaf M.A.Saeed Ahmad Radzi Mat Isa H.A.Rahnamaye Aliabad M.R.Sahar Department of Physics Faculty of ScienceUniversiti Teknologi MalaysiaSkudai-81310JohorMalaysia Department of Physics Hakim Sabzevari UniversityIran

The highly accurate full-potential linearized augmented plane wave plus local orbital method is employed to calculate the structural,electronic and transport properties of HgIn_(2)S_(4) and ZnIn_(2)S_(4).For ZnIn_(2)S_(4),the calculated In–S bond length is in good agreement with the experimental *** moduli results suggest that ZnIn_(2)S_(4) can afford more compressional effects than HgIn_(2)S_(4).The present study confirms that both HgIn_(2)S_(4) and ZnIn_(2)S_(4) are indirect band gap materials with band gap values of 0.705 eV and 1.533 eV *** localized region existing in the most bottom valance band of both materials splits into states by 1 eV energy difference under the spin orbital coupling *** plots of charge density predict that chemical bonding in these compounds is a mixture of ionic and covalent *** mass results reveal that mobility of charge carriers in ZnIn_(2)S_(4) is greater than that in HgIn_(2)S_(4).

关键词： effect. orbital charge

Optoelectronic Properties of Pure and Co Doped Indium Oxide by Hubbard and modified Becke–Johnson Exchange Potentials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第12期30卷 107-111页

作者： H.A.Rahnamaye Aliabad M.Bazrafshan H.Vaezi masood yousaf Junaid Munir M.A.Saeed Department of Physics Hakim Sabzevari UniversitySabzevarIran Department of Physics Khayyam Institute of Higher EducationMashhadIran Department of Physics Universiti Teknologi MalaysiaSkudai 81310JohorMalaysia

Structural and optoelectronic properties of pure and Co doped In2O3 are studied by employing the full-potential linearized augmented plane wave method,which is known to produce highly accurate *** principles calculations are performed with ordinary generalized gradient approximation(GGA)along with new Hubbard and modified Becke-Johnson exchange(mBJ)potential *** band gap results are obtained for In2O3 with GGA+U and *** the case of mBJ,the band gap values are 3.5 eV and 3.4 eV for rhombohedral and cubic phases,which are in close agreement with the experimental *** of In by Co 25%alters the energy gap and a spin splitting effect is observed in these *** the spin-up state,it remains semiconductor,whereas for the spin-down state it shows semimetallic *** value of static refractive index n(0)is 1.74 for the cubic phase,while in rhombohedral phase the values of n(0)are 1.77 and 1.74 along xx and zz optical axes,*** calculated optical properties conform anisotropy in the rhombohedral phase and these materials can be potential candidates for the optoelectronics applications.

关键词： behavior Hubbard cubic

An Improved Study of Electronic Band Structure and Optical Parameters of X-Phosphides (X=B, Al, Ga, In) by Modified Becke-Johnson Potential

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2012年第11期58卷 777-784页

作者： masood yousaf M.A. Saeed R. Ahmed M.M. Alsardia Ahmad Radzi Mat Isa A. Shaari Physics Department Faculty of ScienceUniversiti Teknologi MalaysiaUTM Skudai81310 JohorMalaysia

We report the electronic band structure and optical parameters of X-Phosphides （X=B, AI, Ga, In） by first-principles technique based on a new approximation known as modified Becke-Johnson （roB J）. This potential is considered more accurate in elaborating excited states properties of insulators and semiconductors as compared to LDA and GGA. The present calculated band gaps values of BP, AlP, GaP, and InP are 1.867 eV, 2.268 eV, 2.090 eV, and 1.377 eV respectively, which are in close agreement to the experimental results. The band gap values trend in this study is as： E9 （mBJ-GGA/LDA）〉 E9 （GGA）〉 Eg （LDA）. Optical parametric quantities （dielectric constant, refractive index, reflectivity and optical conductivity） which based on the band structure are aiso presented and discussed. BP, AlP, GaP, and InP have strong absorption in between the energy range 4-9 eV, 4-7 ev, 3-7 eV, and 2-7 eV respectively. Static dielectric constant, static refractive index and coefficient of reflectivity at zero frequency, within mBJ-GGA, are also calculated. BP, AIP, GaP, and InP show significant optical conductivity in the range 5.2-10 eV, 4.3-8 eV, 3.5- 7.2 eV, and 3.2-8 eV respectively. The present study endorses that the said compounds can be used in opto-electronic applications, for different energy ranges.

关键词： DFT FP-LAPW + lo mBJ-GGA optical properties electronic structure

Effect of Zn doping on electronic structure and optical properties zincblende GaN(A DFT+U insight)

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2021年第3期73卷 139-147页

作者： Muhammad Junaid Iqbal Khan Zarfishan Kanwal masood yousaf Hamid Ullah Javed Ahmad Abid Latif Yong-Han Shin Ata Ur Rahman Khalid Laboratory of Theoretical and Experimental Physics Department of PhysicsBahauddin Zakariya UniversityMultan(60800)Pakistan Department of Civil Engineering Faculty of Engineering and TechnologyBahauddin Zakariya UniversityMultan60800Pakistan Department of Physics Division of Science and TechnologyUniversity of EducationTownshipLahore54770Pakistan Multiscale Materials Modelling Laboratory Department of PhysicsUniversity of UlsanUlsan44610Republic of Korea

The development of new materials,having exceptional properties in comparison to existing materials is highly required for bringing advancement in electronic and optoelectronic *** this fact,we investigated structural,electronic,and optical properties of zincblende GaN doped with selected Zn concentrations(6.25%,12.50%,and 18.70%),using the first-principle calculations based on density functional theory with GGA+*** conducted the entire study using the WIEN2K *** this study,we calculated various significant parametric quantities such as cohesive energies,formation energies,bulk moduli,and lattice constants along with the study of optical and electronic properties by substituting Ga atoms with Zn atoms in 1×2×2 *** structural stability is confirmed by studying the phonon dispersion curves which suggest that Zn:GaN material is stable against the 6.25%and 18.70%Zn concentrations while for 12.50%,it shows *** Hubbard values U=0,2,4,6 eV were added to GGA and the electronic properties were improved with the U=6 *** absorption was blue shifted while the refractive index and dielectric constant were increased with increasing the Zn *** properties are enhanced due to the prime contribution of cations(Zn)3ri *** optical and electronic properties are further discussed in detail in the entire study.

关键词： density functional theory(DFT) optoelectronics Ⅲ-Ⅴsemiconductors optical properties electronic properties structural properties

Machine Learning for QoS Optimization and Energy-Efficient in Routing Clustering Wireless Sensors

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 327-343页

作者： Rahma Gantassi Zaki masood Yonghoon Choi Department of Electrical Engineering Chonnam National University Gwangju61186Republic of Korea

Wireless sensor network(WSN)technologies have advanced significantly in recent *** in WSNs,machine learning algorithms are crucial in selecting cluster heads(CHs)based on various quality of service(QoS)*** paper proposes a new clustering routing protocol employing the Traveling Salesman Problem(TSP)to locate the optimal path traversed by the Mobile Data Collector(MDC),in terms of energy and QoS *** bemore specific,to minimize energy consumption in the CH election stage,we have developed the M-T protocol using the K-Means and the grid clustering *** addition,to improve the transmission phase of the Low Energy Adaptive Clustering-Grid-KMeans(LEACH-G-K)protocol,the MDC is employed as an intermediary between the CH and the sink to improve the wireless sensor network(WSN)*** results of the experiment demonstrate that the M-T protocol enhances various Low Energy Adaptive Clustering protocol(LEACH)improvements such as the LEACH-G-K,LEACH-C,Threshold sensitive Energy Efficient Sensor Networks(TEEN),MDC maximum residual energy leach protocol.

关键词： LEACH-G-K MDC TSP QoS K-Means

Data-Driven Probabilistic S for Batsman Performance Prediction in a Cricket Match

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第6期36卷 2865-2877页

作者： Fawad Nasim Muhammad Adnan yousaf Sohail masood Arfan Jaffar Muhammad Rashid Superior University Lahore54000Pakistan Intelligent Data Visual Computing Research(IDVCR) LahorePakistan National University of Technology Islamabad44000Pakistan

Batsmen are the backbone of any cricket team and their selection is very critical to the team’s success.A good batsman not only scores run but also provides stability to the team’s *** most important factor in selecting a batsman is their ability to score *** is a generally accepted notion that the future performance of a batsman can be predicted by observing and analyzing their past *** hypothesis is based on the fact that a player’s batting aver-age is generally considered to be a good indicator of their future *** proposed a data-driven probabilistic system for batsman performance prediction in the game of *** captures the dependencies between the runs scored by a batsman in consecutive *** system is evaluated using a dataset extracted from the Cricinfo *** system is based on a Hidden Markov model(HMM).HMM is used to generate the prediction model to foresee players’upcoming *** first-order Markov chain assumes that the probabil-ity of a batsman scoring runs in the next ball is only dependent on how many runs he scored in the current *** use a data-driven approach to learn the para-meters of the HMM from data.A probabilistic matrix is made that predicts what scores the batter can do on the upcoming *** results show that the system can accurately predict the runs scored by a batsman in a ball.

关键词： Probabilistic matrix hidden markov model batsman performance prediction

Stokes' First Problem for an MHD Burgers Fluid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2013年第1期59卷 99-104页

作者： masood Khan Department of Mathematics Quaid-i-Azam University

This work is related to the flow of a magnetohydrodynamic Burgers *** flow of an incompressible conducting Burgers fluid in the presence of a uniform transverse magnetic field over a plate that is moved suddenly is *** the application of the Laplace and Fourier sine transforms techniques,the exact analytical expressions for the velocity field and associated shear stress are determined in simple *** are written as a sum of steady-state and transient *** graphical results are plotted for different values of indispensable parameters and some interesting results are *** corresponding solutions for the hydrodynamic Burgers fluid appear as the limiting cases of the obtained solutions.

关键词： Stokes' first problem Burgers fluid Laplace and Fourier sine transforms exact solutions