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Entropic measures of an atom confined in modified Hulthen potential Results Phys. (IF 4.019) Pub Date : 2021-01-06 Kirtee Kumar; Vinod Prasad
Various information theoretic measures, complexities and their inequalities are studied for hydrogen atom under modified Hulthen potential which is a combination of Hulthen potential and inverse square potential. In addition, spherical confinement is also considered. Few of these results are compared with the results are available in the literature. In particular the Shannon entropy for free and confined
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Deep subwavelength graphene-dielectric hybrid plasmonic waveguide for compact photonic integration Results Phys. (IF 4.019) Pub Date : 2021-01-15 Xueqing He; Tigang Ning; Li Pei; Jingjing Zheng; Jing Li; Jianshuai Wang
In this paper, we propose a novel graphene-dielectric hybrid plasmonic waveguide (GDHPW). The fundamental hybrid mode characteristics guided by the GDHPW are numerically investigated. The results show ultra-small mode area (~10−4λ2) and long propagation length (tens of micrometers) can be simultaneously realized by tuning the key geometric structure parameters and the chemical potential of graphene
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Long-term photovoltaic performance of thin-film solar cells with diffractive microlens arrays on glass substrates Results Phys. (IF 4.019) Pub Date : 2021-01-16 Ping Li; Xiaochu Liu; Qiaoxuan Cheng; Zhongwei Liang
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Corrections of order O(Ee2∕mN2), caused by weak magnetism and proton recoil, to the neutron lifetime and correlation coefficients of the neutron beta decay Results Phys. (IF 4.019) Pub Date : 2021-01-01 A.N. Ivanov; R. Höllwieser; N.I. Troitskaya; M. Wellenzohn; Ya.A. Berdnikov
We calculate the contributions of weak magnetism and proton recoil of order O(Ee2∕mN2)∼10−5, i.e. to next-to-next-to-leading order in the large nucleon mass expansion, to the neutron lifetime and correlation coefficients of the neutron beta decay, where Ee and mN are the electron energy and the nucleon mass, respectively. We analyze the electron-energy and angular distribution for the neutron beta
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Dynamics of fractional order COVID-19 model with a case study of Saudi Arabia Results Phys. (IF 4.019) Pub Date : 2021-01-02 Yu-Ming Chu; Aatif Ali; Muhammad Altaf Khan; Saeed Islam; Saif Ullah
The novel coronavirus disease or COVID-19 is still posing an alarming situation around the globe. The whole world is facing the second wave of this novel pandemic. Recently, the researchers are focused to study the complex dynamics and possible control of this global infection. Mathematical modeling is a useful tool and gains much interest in this regard. In this paper, a fractional-order transmission
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Nonlinear Dynamics of a Bose-Einstein condensate excited by a vortex ring phase imprinting Results Phys. (IF 4.019) Pub Date : 2021-01-20 Wen-Kai Bai; Jian-Chong Xing; Tao Yang; Wen-Li Yang; Wu-Ming Liu
We study the nonlinear dynamics of a three-dimensional Bose-Einstein condensate (BEC) excited by a vortex ring phase imprinting. We identify independent, integrated, and stationary modes of the center-of-mass oscillation of the condensate with respect to the vortex ring movement. We show that the oscillation amplitude of the center-of-mass of the condensate depends strongly on the initial radius of
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Exact solutions of the stochastic new coupled Konno-Oono equation Results Phys. (IF 4.019) Pub Date : 2021-01-20 W.W. Mohammed; N. Iqbal; A. Ali; M. El-Morshedy
In this paper we consider the stochastic Konno-Oono equation, which is forced by multiplicative noise. In order to find exact solutions of stochastic nonlinear Konno-Oono equations, generalized G′G-expansion method are implemented. Different forms of traveling wave solutions such as complex hyperbolic function and complex trigonometric function have emerged with various parameters. The results obtained
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Energy conditions and entropy density of the universe Results Phys. (IF 4.019) Pub Date : 2021-01-15 Wen-Fei Liu; Jing Niu; Juan Li; Tong-Jie Zhang
In the standard Friedmann-Lemaître-Robertson-Walker (FLRW) cosmological model, the energy conditions provides model-independent bounds on the behavior of the distance modulus. However, this method can not provide us the detailed information about the violation between the energy conditions and the observation. In this paper, we present an extended analysis of the energy conditions based upon the entropy
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Laser micromachining of steel and copper using femtosecond laser pulses in GHz burst mode Results Phys. (IF 4.019) Pub Date : 2021-01-19 Ona Balachninaitė; Viktorija Tamulienė; Laurynas Eičas; Virgilijus Vaičaitis
Investigations on the ablation of steel and copper with femtosecond laser pulses using single pulses and bursts of infinite sequence of pulses with 1 GHz intraburst repetition rate are presented in this paper. The ablation efficiency is compared to the case of single femtosecond laser pulses. Based on the literature a model of the ablation process is presented explaining the behavior of a pulse burst
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A new method of carrier density measurement using photocurrent maps of a 2D material Schottky diode Results Phys. (IF 4.019) Pub Date : 2021-01-19 Il-Ho Ahn; Jongtae Ahn; Do Kyung Hwang; Deuk Young Kim
A simple method for obtaining the charge carrier density of two-dimensional (2D) materials is proposed herein. A formula is suggested for the extraction of the 2D charge carrier density using the horizontal depletion width, which is visually represented by photocurrent mapping methods. An example of this method is demonstrated using a MoS2 Schottky diode. The results suggest that this method can be
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Pressure dependence of structural, elastic, electronic, thermodynamic, and optical properties of van der Waals-type NaSn2P2 pnictide superconductor: insights from DFT study Results Phys. (IF 4.019) Pub Date : 2021-01-19 F. Parvin; S.H. Naqib
NaSn2P2 is a recently discovered superconducting system belonging to a particular class of materials with van der Waals (vdW) structure. There is enormous interest in vdW compounds because of their intriguing electrical, optical, chemical, thermal, and superconducting state properties. We have studied the pressure dependent structural, thermo-physical, electronic band structure, and superconducting
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Optimization of the coherence properties of diamond samples with an intermediate concentration of NV centers Results Phys. (IF 4.019) Pub Date : 2021-01-19 O.R. Rubinas; V.V. Soshenko; S.V. Bolshedvorskii; A.I. Zeleneev; A.S. Galkin; S.A. Tarelkin; S.Y. Troschiev; V.V. Vorobyov; V.N. Sorokin; A.A. Sukhanov; V.G. Vins; A.N. Smolyaninov; A.V. Akimov
The sensitivity of the nitrogen-vacancy (NV) color centers in diamond-based magnetometers strongly depends on the number of NV centers involved in the measurement. Unfortunately, an increasing concentration of NV centers leads to a decrease in their dephasing and coherence times if the nitrogen content exceeds a certain threshold level (approximately 1017cm-3 or 0.6 ppm). Here, we demonstrate that
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Structural, Electronic, Mechanical, and Dynamical Properties of Scandium Carbide Results Phys. (IF 4.019) Pub Date : 2021-01-08 Mohammed S. Abu-Jafar; Vincent Leonhardi; Raed Jaradat; Ahmad A. Mousa; Samah Al-Qaisi; Nada T. Mahmoud; Ahmed Bassalat; R. Khenata; A. Bouhemadou
We report results of first-principles calculations for the structural, mechanical, dynamical and electronic properties of Scandium Carbide (ScC) compound, using a Full-Potential Linearized-Augmented Plane Wave (FP-LAPW) method based on density functional theory, within the generalized gradient approximation (GGA).The computed ground states properties; lattice constants, bulk modulus and the pressure
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Transient flow of micropolar dusty hybrid nanofluid loaded with Fe3O4-Ag nanoparticles through a porous stretching sheet Results Phys. (IF 4.019) Pub Date : 2021-01-02 Hossam A. Nabwey; A. Mahdy
A Comprehensive investigation is conducted on transient magnetohydrodynamics boundary layer flow of non-Newtonian micropolar hybrid nanofluid (Fe3O4-Ag) immersed with conducting micrometer homogeneously sized dust nanoparticles within a stretching sheet adjacent to prescribed surface temperature (PST) and prescribed heat flux (PHF) cases is presented. The mathematical model is formulated then the convenient
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A hollow exponential ultrasonic horn for aluminum melt degassing under power ultrasound and rotating flow field Results Phys. (IF 4.019) Pub Date : 2021-01-14 Ao Wang; Guili Gao; Dayong Li; Decai Lu; Ming Wang; Dequan Shi; Zhenyu Xu
To meet the need of aluminum melt degassing, a hollow exponential ultrasonic horn was proposed. The numerical analysis showed that the amplification factor and shape factor of the horn will increase with the increasing central hole diameter. When the hole diameter is less than 20 mm, they increase slowly while rapidly once the hole diameter excessed 35 mm. The modal analysis and experiments indicated
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Thermosolutal natural convection across an inclined square enclosure partially filled with a porous medium Results Phys. (IF 4.019) Pub Date : 2021-01-08 Noureddine Hadidi; Redha Rebhi; Rachid Bennacer; Younes Menni; Houari Ameur; Giulio Lorenzini; Khaled A. Gepreel; Hijaz Ahmad
The present study is a numerical inspection of the natural convection with double diffusion in a tilted square cavity filled with a vertical bi-layered composed porous and an adjacent fluid. Isotropic and homogeneous porous layer is considered in this case study. The porous layer is saturated by an aqueous solution with a Prandtl number Pr = 7. The horizontal walls are considered impermeable and adiabatic
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On Fractional Order Model of Tumor Dynamics with Drug interventions under Nonlocal Fractional Derivative Results Phys. (IF 4.019) Pub Date : 2021-01-06 Muhammad Arfan; Kamal Shah; Aman Ullah; Meshal Shutaywi; Poom Kumam; Zahir Shah
In our research article, the mathematical model of fractional non-linear cancer dynamical system with the interaction of tumor cells, immune, and drugs reaction systems is taken in ABC derivative sense of fractional order. Qualitative results including existence and uniqueness has been analyzed by applying some theorems of fixed point theory. The approximate results for the considered system are obtained
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Chaos control and analysis of fractional order neural network under electromagnetic radiation Results Phys. (IF 4.019) Pub Date : 2021-01-02 F.M. Allehiany; Emad E. Mahmoud; Lone Seth Jahanzaib; Pushali Trikha; Hammad Alotaibi
In the manuscript, fractional order neural network under electromagnetic radiation is introduced and its dynamics studied using Lyapunov exponents, stagnation points, symmetry, bifurcation diagrams etc. The dynamics for variable fractional order between 0.8 to 1 is also observed. The neural network model shows high sensitivity to external stimuli. The neural functioning shows improvement when exposed
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Research on the effects of bismuth borate glass system on nuclear radiation shielding parameters Results Phys. (IF 4.019) Pub Date : 2021-01-17 M. Kamislioglu
There has been an increasing number of research and development activities focusing on the use of different glass systems for their nuclear radiation shielding features. In this study a simulation study has been carried out at a wide photon energy region in order to investigate the radiation protection feature of bismuth borate glasses. This study has been conducted to evaluate the proficiency level
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Prediction Modelling of COVID using Machine Learning methods from B-Cell dataset Results Phys. (IF 4.019) Pub Date : 2021-01-17 Nikita Jain; Srishti Jhunthra; Harshit Garg; Vedika Gupta; Senthilkumar Mohan; Ali Ahmadian; Soheil Salahshour; Massimiliano Ferrara
Coronavirus is a pandemic that has become a concern for the whole world. This disease has stepped out to its greatest extent and is expanding day by day. Coronavirus, termed as a worldwide disease, has caused more than 8 lakh deaths worldwide. The foremost cause of the spread of coronavirus is SARS-CoV and SARS-CoV-2, which are part of the coronavirus family. Thus, predicting the patients suffering
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Nanosensor based on Fano Resonance in a Metal-Insulator-Metal Waveguide Structure Coupled with a Half-ring Results Phys. (IF 4.019) Pub Date : 2021-01-16 Haoran Shi; Shubin Yan; Xiaoyu Yang; Hao Su; Xiushan Wu; Ertian Hua
Herein, an ultra compact plasmonics-based refractive index nanosensor is designed consisting of a metal-insulator-metal (MIM) waveguide with a silver-bar and a triangle stub, coupled with a half-ring resonator which can excite Fano resonance. The finite element method (FEM) is used to analyze the transmission spectra of the proposed design. The transmission spectra showed that there were typical Fano
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Near zero thermal expansion in metal matrix composites based on intermediate valence systems: Al/SmB6 Results Phys. (IF 4.019) Pub Date : 2021-01-16 D.A. Serebrennikov; A.A. Bykov; A.L. Trigub; N.A. Kolyshkin; A.L. Freydman; A.V. Aborkin; A.O. Tovpinets; E.S. Clementyev; A.Yu. Goikhman
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Raspberry structures in microgel–silica nanoparticle composite systems Results Phys. (IF 4.019) Pub Date : 2021-01-13 O. Holderer; S. Maccarrone; S. Pasini; M.-S. Appavou; A. Gelissen
Composite materials consisting of responsive microgels together with additional nanoparticles might provide new and “smart” functionality, e.g. uptake and release of nanoparticles, or special mechanical or rheological properties of a solution. Here, composites consisting of PNIPAM microgels and silica nanoparticles have been investigated by CryoTEM and neutron scattering techniques. The formation of
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The soliton solutions and evolution of the (2+1)-dimensional dissipative long wave equation Results Phys. (IF 4.019) Pub Date : 2021-01-02 Juan Yang; Qingjiang Feng
With the help of Mathematica symbolic calculation software, the new soliton solutions of the (2 + 1)-dimensional dissipative long wave equation were obtained by utilizing the exp(-Φ(ξ)) expansion method and the variable separation method, which include the linear soliton solution, periodic lump solution, ring soliton solution, and solitoff soliton solution. The elastic collision, soliton fission, and
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Collective decay induce quantum phase transition in a well-controlled hybrid quantum system Results Phys. (IF 4.019) Pub Date : 2021-01-13 Dong-Yan Lü; Guang-Hui Wang; Yuan Zhou; Li Xu; Yong-Jin Hu; Wei-You Zeng; Qing-Lan Wang
Manipulation of the quantum phase transition (QPT) of the general Lipkin-Meshkov-Glick (LMG) model is studied in a well-controlled hybrid quantum system, with respect to the Bose–Einstein condensate (BEC) magnetically coupled to a quantum cantilever. The collective decay treated as a traditional adverse factor, however, plays the key role in changing the systemic symmetry, and then evokes the additional
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New Optical Solutions of Conformable Fractional Perturbed Gerdjikov-Ivanov Equation in Mathematical Nonlinear Optics Results Phys. (IF 4.019) Pub Date : 2021-01-15 Aniqa Zulfiqar; Jamshad Ahmad
The current article explores the new optical solutions of the conformable fractional perturbed Gerdjikov-Ivanov (pGI) equation. The tanh method and the tanh-coth method have been applied for obtaining new solitary wave solutions. As a result, many previously known results of the conformable fractional pGI equation can be recovered by applying some appropriate choices of the arbitrary functions and
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Stochastic Modeling of Within Host Dynamics of HCV Model Under Therapy Results Phys. (IF 4.019) Pub Date : 2021-01-15 Qaisar Badshah; Kottakkaran Sooppy Nasar; Ghaus ur Rahman; Ravi P. Agarwal; Saeed Islam
A new mathematical model is formulated governing the dynamics of HCV infection. In order to study a more realistic situation, the death rates as well as contact ratio are perturbed via Gaussian white noise. Stochastic calculus is used to carry out related results. To see the efficiency of drug therapy, infected cells are divided into n different sub-compartments. Initially, it is shown that the solution
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Prediction of mechanical and radiation parameters of glasses with high Bi2O3 concentration Results Phys. (IF 4.019) Pub Date : 2021-01-14 El-Denglawey; Hesham M.H. Zakaly; K. Alshammari; Shams A.M. Issa; H.O. Tekin; Yasser B. Saddeek
This study aims to perform multidirectional characterizations on nuclear shielding efficiencies on some bismuth-based glasses. Accordingly, the γattenuation coefficients for xBi2O3-(75-x)B2O3−25Li2O (x= 0, 10, 20, 30, 40, 50, 60 the 70 mol%) were widely evaluated using simulations and theoretical methods. Linear attenuation coefficient (LAC) of the glasses was obtained by the Monte Carlo general-purpose
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Forecasting of COVID-19 cases using Deep learning models: Is it reliable and practically significant? Results Phys. (IF 4.019) Pub Date : 2021-01-14 Jayanthi Devaraj; Rajvikram Madurai Elavarasan; Rishi Pugazhendhi; G.M. Shafiullah; Sumathi Ganesan; Ajay Kaarthic Jeysree; Irfan Ahmad Khan; Eklas Hossain
The ongoing outbreak of the COVID-19 pandemic prevails as an ultimatum to the global economic growth and henceforth, all of society since neither a curing drug nor a preventing vaccine is discovered. The spread of COVID-19 is increasing day by day, imposing human lives and economy at risk. Due to the increased enormity of the number of COVID-19 cases, the role of Artificial Intelligence (AI) is imperative
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Tailorable polygon-like beams generated by modified spiral petal-like zone plates Results Phys. (IF 4.019) Pub Date : 2021-01-08 Tian Xia; Shubo Cheng; Weixing Yu; Shaohua Tao
A modified spiral petal-like zone plate (MSPZP) is proposed to generate the polygon-like beam with the tailorable shape, size and topological charge. The size and shape of the polygon-like beam are adjustalbe by the frequency N and the exponent m, whose product represents the number of sides of the polygon. Moreover, the size of the polygon-like beam can be also tailorable by the original radius r0
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Study of (Ag and TiO2)/water nanoparticles shape effect on heat transfer and hybrid nanofluid flow toward stretching shrinking horizontal cylinder Results Phys. (IF 4.019) Pub Date : 2021-01-06 Umair Rashid; Haiyi Liang; Hijaz Ahmad; Muhammad Abbas; Azhar Iqbal; Y.S. Hamed
This study reflects the behaviorof nanoparticles shape on (Ag-TiO2)/water hybrid nanofluid flow toward the horizontal permeable stretching shrinking cylinder. The effect of suction and injection parameters is also considered. Three different shapes (sphere, blade, and lamina) of Ag and TiO2 are used in this study. The boundarylayer equations of the problem are transformed to a setof non-linearODEs
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A comparative epidemiological stability analysis of predictor corrector type non-standard finite difference scheme for the transmissibility of measles Results Phys. (IF 4.019) Pub Date : 2021-01-01 Asma Farooqi; Riaz Ahmad; Hammad Alotaibi; Taher A. Nofal; Rashada Farooqi; Ilyas Khan
In this article, a predictor-corrector type non-standard finite difference scheme has been formulated to avoid unnatural chaos, and numerical instabilities depend on a long time step, lead to a better strategy for overcoming the transmission of infectious diseases. The construction, development, and analysis of our proposed numerical scheme is done for the SEIR epidemiological model regarding the transmission
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An analysis of a nonlinear susceptible-exposed-infected-quarantine-recovered pandemic model of a novel coronavirus with delay effect Results Phys. (IF 4.019) Pub Date : 2020-12-28 Ali Raza; Ali Ahmadian; Muhammad Rafiq; Soheil Salahshour; Massimiliano Ferrara
In the present study, a nonlinear delayed coronavirus pandemic model is investigated in the human population. For study, we find the equilibria of susceptible-exposed-infected-quarantine-recovered model with delay term. The stability of the model is investigated using well-posedness, Routh Hurwitz criterion, Volterra Lyapunov function, and Lasalle invariance principle. The effect of the reproduction
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Threshold conditions for global stability of disease free state of COVID-19 Results Phys. (IF 4.019) Pub Date : 2021-01-06 Muhammad Zamir; Kamal Shah; Fawad Nadeem; Mohd Yazid Bajuri; Ali Ahmadian; Soheil Salahshour; Massimiliano Ferrara
This article focus the elimination and control of the infection caused by COVID-19. Mathematical model of the disease is formulated. With help of sensitivity analysis of the reproduction number the most sensitive parameters regarding transmission of infection are found. Consequently strategies for the control of infection are proposed. Threshold condition for global stability of the disease free state
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Non-standard finite difference scheme and analysis of smoking model with reversion class Results Phys. (IF 4.019) Pub Date : 2021-01-06 Anwar Zeb; Abdullah Alzahrani
Smokers are at more risk to COVID-19 as the entertainment of smoking because their fingers are in touch with lips regularly during smoking that increases the probability of transmission of virus from hand to mouth. On other hand the smokers may have lung disease (or reduced lung capacity) which would greatly increase risk of serious illness especially COVID-19. For this esteem, in this research work
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The exact solutions for the (3+1)-dimensional Boiti-Leon-Manna-Pempinelli equation Results Phys. (IF 4.019) Pub Date : 2021-01-13 Xiaofang Duan; Junliang Lu
In the paper, we study the Boiti-Leon-Manna-Pempinelli equation with (3+1) dimension. By using the modified hyperbolic tangent function method, we obtain more new exact solutions for the (3+1)-dimensional Boiti-Leon-Manna-Pempinelli equation, which expand the solutions in previous literature. Those solutions have three forms determined according to the choice of parameters: trigonometric function form
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One-dimensional quantum droplets under space-periodic nonlinear management Results Phys. (IF 4.019) Pub Date : 2021-01-06 Junbo Chen; Jianhua Zeng
Quantum droplets have recently emerged as a novel liquid state of matter in a mixture of two-component ultracold Bose gases under the equilibrium condition between the competing attractive inter- and repulsive intraspecies forces. Quantum droplets represent a self-bound liquid state in purely nonlinear systems and as such there is not any management applied to their study up to now. We here introduce
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Natural surface oxidation consideration in first principles modeling of the X-ray absorption near edge fine structure of silicon Results Phys. (IF 4.019) Pub Date : 2020-12-26 S.I. Kurganskii; O.A. Dezhina; M.D. Manyakin; E.V. Parinova; D.A. Koyuda; S.Yu. Turishchev
First-principles calculations of the electronic structure of crystalline silicon and its dioxide were performed on the basis of the density functional theory. The full-potential linearized augmented plane waves method was used with the generalized gradient approximation for the exchange-correlation potential with Perdew, Burke and Ernzerhof functional. X-ray absorption near edge structure of silicon
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Particle dynamics around quintessential Reissner-Nordström black hole Results Phys. (IF 4.019) Pub Date : 2020-12-31 Israr Ali Khan; Amir Sultan Khan; Saeed Islam; Shah Qasim Jan; Kottakkaran Sooppy Nisar; Muhammad Uzair Shah
In this article, we study the dynamics of neutral as well as charged particle in the presence of magnetic field around Reissner-Nordström black hole surrounded by quintessence by taking into account Noether symmetries and conservation laws in the corresponding spacetime. Using these conservation laws, we explore the effect of angular momentum, quintessence parameter, and magnetic field graphically
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Identification of dominant risk factor involved in spread of COVID-19 using hesitant fuzzy MCDM methodology Results Phys. (IF 4.019) Pub Date : 2021-01-07 Neha Ghorui; Arijit Ghosh; Sankar Prasad Mondal; Mohd Yazid Bajuri; Ali Ahmadian; Soheil Salahshour; Massimiliano Ferrara
The outburst of the pandemic Coronavirus disease since December 2019, has severely impacted the health and economy worldwide. The epidemic is spreading fast through various means, as the virus is very infectious. Medical science is exploring a vaccine, only symptomatic treatment is possible at the moment. To contain the virus, it is required to categorize the risk factors and rank those in terms of
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Construction of multi-wave complexiton solutions of the Kadomtsev-Petviashvili equation via two efficient analyzing techniques Results Phys. (IF 4.019) Pub Date : 2021-01-02 Abdullahi Yusuf; Tukur Abdulkadir Sulaiman; E.M. Khalil; Mustafa Bayram; Hijaz Ahmad
This study aims to investigate the (2 + 1)-dimensional Kadomtsev-Petviashvili equation via the three-waves method through the Hirota bilinear form and the Kudryashov’s method. Multi-waves solutions and exponential function solutions are successfully extracted. To share more light to the physical features of the reported results, the interaction phenomenon of these obtained solutions are demonstrated
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The Electronic and Optical Properties of Au decorated(104) dolomite surface: A first principles calculations Results Phys. (IF 4.019) Pub Date : 2021-01-11 Jianrong Wang; Weibin Zhang; Qingfeng Wu; Shufang Gao; Yuanyuan Jin; Yi Xiao; Yan Chen
The electronic and optical properties before and after Au decoration on (10_1_14) surface of dolomite were investigated based on first principles calculations. The electronic structure analysis indicates that the band gap decreases from 4.25 eV (pristine) to 0.81 eV(1 Au decorated case), and the work functions increase from 2.41 eV to 3.53 eV. The density of states analysis revealed that the band gap
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Arbitrary amplitude dust-acoustic waves in Jupiter atmosphere Results Phys. (IF 4.019) Pub Date : 2020-12-31 Haifa A. Al-Yousef; B.M. Alotaibi; R.E. Tolba; W.M. Moslem
Arbitrary amplitude dust-acoustic solitary waves in a dusty plasma in Jupiter atmosphere are expected to occur for distance greater than 15RJ, where RJ is the distance from the center of the Jupiter (RJ = 71398 km). We used the generalized hydrodynamic model for positive dust grains, Maxwellian electrons and ions those interact with solar wind protons and electrons. The energy-balance-like equation
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Dust-ion-acoustic shock waves in the presence of dust charge fluctuation in non-Maxwellian plasmas with Kappa-distributed electrons Results Phys. (IF 4.019) Pub Date : 2020-12-31 M. Kamran; Fazal Sattar; Majid Khan; R. Khan; M. Ikram
A three-component plasma composed of nonthermal Kappa-distributed electrons, mobile ions, stationary and dust-fluctuating (spherical) dust particles is considered. By employing reductive perturbation method in a weakly nonlinear limit, the Burger’s equation has been derived and the basic properties of dust ion acoustic shock waves are analyzed. It is observed that for increasing ion–electron temperature
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On the analysis of number of deaths due to Covid −19 outbreak data using a new class of distributions Results Phys. (IF 4.019) Pub Date : 2020-12-29 Tabassum Naz Sindhu; Anum Shafiq; Qasem M. Al-Mdallal
In this article, we develop a generator to suggest a generalization of the Gumbel type-II model known as generalized log-exponential transformation of Gumbel Type-II (GLET-GTII), which extends a more flexible model for modeling life data. Owing to basic transformation containing an extra parameter, every existing lifetime model can be made more flexible with suggested development. Some specific statistical
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Mathematical analysis and design of the nonstandard computational method for an epidemic model of computer virus with delay Effect: Application of mathematical biology in computer science Results Phys. (IF 4.019) Pub Date : 2020-12-30 Ali Raza; Umbreen Fatima; Muhammad Rafiq; Nauman Ahmed; Ilyas Khan; Kottakkaran Sooppy Nisar; Zafar Iqbal
Mathematical modeling with nonlinear delay differential equations (DDES) impart a significant role in the different disciplines such as epidemiology, computer modeling, immunology, physiology, neural networks, social sciences, bio-medical engineering, and many more. In this manuscript, a nonlinear delayed model is investigated to study the dynamics of a virus in a computer network. Many important results
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Global dynamics for a discrete quarantine/isolation model Results Phys. (IF 4.019) Pub Date : 2021-01-02 Mohammad A. Safi; Bashir Al-Hdaibat; Mahmoud H. DarAssi; Muhammad Altaf Khan
We propose in the present paper a discrete mathematical model by obtaining it from a continuous time model. We present in brief the mathematical formulation of the model using Euler-backward differences. The discrete model is then analyzed and present its mathematical results. The fundamental results for the discrete mathematical model are explored. We present the stability of the fixed points for
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Explicit tight frames for simulating a new system of fractional nonlinear partial differential equation model of Alzheimer disease Results Phys. (IF 4.019) Pub Date : 2021-01-10 Mutaz Mohammad; Alexander Trounev
This paper is devoted to develop a new mathematical model for Alzheimer disease based on a system of fractional-order partial differential equations. The system of Alzheimer disease includes neurons, astrocytes, microglias and peripheral macrophages, as well as amyloid β aggregation and hyperphosphorylated tau proteins. We consider the Caputo fractional derivative definition to analyze the formulated
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Dengue Control Measures via Cytoplasmic Incompatibility and Modern Programming Tools Results Phys. (IF 4.019) Pub Date : 2021-01-10 Ayesha Sohail; Mehwish Iftikhar; Robia Arif; Hijaz Ahmad; Khaled A. Gepreel; Sahrish Iftikhar
The vector borne diseases share a high percentage of the annual deaths reported by the world health organization. Due to the involvement of multiple factors and resistance of the vector to the treatment strategies, it is highly desired to design a safe, efficient and harmless control strategy. A state of the art computational framework for the Wolbachia induced “genetic-control-strategy” has been documented
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Low threshold optical bistability based on coupled graphene Tamm states Results Phys. (IF 4.019) Pub Date : 2021-01-08 Yuexiang Wu; Xiaoji Zhao; Jiashun Hu; Hailin Xu
The optical bistability based on an asymmetric dielectric Bragg reflector (DBR)–graphene–DBR (ADGD) structure is investigated numerically in terahertz frequencies. The threshold of optical bistability can be significantly reduced due to the strong enhancement of localized light field for the coupling between the Tamm states on the two sides of graphene. The threshold value of ADGD is nearly an order
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Tunability of ac conductivity in manganese doped cobalt ferrite nanoparticles Results Phys. (IF 4.019) Pub Date : 2020-12-28 M.Z. Ahsan; M.A. Islam; F.A. Khan
This paper reports on the experimental findings of ac conductivity as determined from the measurement of conductance by using the Waynekerr 6500B impedance analyzer for the stoichiometric and non-stoichiometric manganese doped cobalt ferrite nanoparticles. In the dispersion of ac conductivity over the frequency band 100 Hz–1 MHz, two distinct conductive bands 100 Hz–1 kHz and 1 kHz–1 MHz for stoichiometric
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Magnetic properties of La0.55CaxSr0.45−xMnO3 perovskite manganite Results Phys. (IF 4.019) Pub Date : 2021-01-04 M.A.A. Bally; M.Z. Ahsan; M.A. Islam; F.A. Khan
Conventional solid-state reaction technique was used to prepare the studied samples La0.55CaxSr0.45−xMnO3 (x = 0.0, 0.1, 0.2). Their structural and magnetic properties have been investigated to find the effect of calcium doping on the D.C. and A.C. magnetic properties of the compounds. Room temperature XRD investigations confirm rhombohedral structure with space group R-3c for all the samples. Lattice
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Computational dynamics of predator-prey model with the power-law kernel Results Phys. (IF 4.019) Pub Date : 2021-01-08 Kolade M. Owolabi
Evolution system which contains fractional derivatives can give rise to useful mathematical model for describing some important real-life or physical scenarios. Here, we suggest some numerical techniques for solving fractional-in-time reaction-diffusion models in the sense of Caputo operator. The suggested schemes are formulated with difference scheme and Fourier-spectral algorithm. In the simulation
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New solitary wave solutions to the coupled Maccari’s system Results Phys. (IF 4.019) Pub Date : 2021-01-08 Javad Vahidi; Sayyed Masood Zekavatmand; Hadi Rezazadeh; Mustafa Inc; Mehmet Ali Akinlar; Yu-Ming Chu
The aim of this study is to find new exact solutions to the coupled Maccaris system by extended rational sine-cosine and rational sinh-cosh methods. By means of these methods, we found some fresh solitons of the above mentioned equation. The solutions are expressed in the form of new periodic ,dark ,bright and bright periodic solitons solutions . These methods are efficient, powerful, and they can
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A modified SEIR model to predict the COVID-19 outbreak in Spain and Italy: Simulating control scenarios and multi-scale epidemics Results Phys. (IF 4.019) Pub Date : 2020-12-25 Leonardo López; Xavier Rodó
After the spread of the SARS-CoV-2 epidemic out of China, evolution in the pandemic worldwide shows dramatic differences among countries. In Europe, the situation of Italy first and later Spain has generated great concen, and despite other countries show better prospects, large uncertainties yet remain on the future evolution and the efficacy of containment, mitigation, or attack strategies. This Manuscript
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Mathematical analysis of SIRD model of COVID-19 with Caputo fractional derivative based on real data Results Phys. (IF 4.019) Pub Date : 2020-12-29 Kottakkaran Sooppy Nisar; Shabir Ahmad; Aman Ullah; Kamal Shah; Hussam Alrabaiah; Muhammad Arfan
We discuss a fractional-order SIRD mathematical model of the COVID-19 disease in the sense of Caputo in this article. We compute the basic reproduction number through the next-generation matrix. We derive the stability results based on the basic reproduction number. We prove the results of the solution existence and uniqueness via fixed point theory. We utilize the fractional Adams–Bashforth method
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On the modeling of an eco-epidemiological model using a new fractional operator Results Phys. (IF 4.019) Pub Date : 2021-01-07 Behzad Ghanbari
Having advanced numerical techniques in solving fractional problems is always one of the apparent needs in increasing the use of these tools in real-world problems. The major part of the progress made in this area has been due to development of effective numerical methods and techniques. In this article, we study a new approach to analyze the dynamics of an eco-epidemiological through a nonlinear fractional
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Effect of transition-elements substitution on mechanical properties and electronic structures of B2-AlCu compounds Results Phys. (IF 4.019) Pub Date : 2020-12-23 Fenger Sun; Guowei Zhang; Heping Liu; Hong Xu; Yizheng Fu; Dongyang Li
The first-principles calculations have been performed to predict the effect of transition-elements substitution on mechanical properties and electronic structures of B2-AlCu compounds. The results show that Zn, Cd, La and Hg are preferred to replace Al atom, while other transition elements are preferred to replace Cu atom. Among the mechanically stable AlCu-TM compounds, the resistance of axial deformation
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On the physical nonlinear (n+1)-dimensional Schrödinger equation applications Results Phys. (IF 4.019) Pub Date : 2020-12-28 H.G. Abdelwahed; E.K. El-Shewy; Mahmoud A.E. Abdelrahman; A.F. Alsarhana
Physical exact nonlinear new solutions for the (n+1)-dimensional Schrödinger have been obtained using RB sub-ODE and He’s semi-inverse techniques. New structures as trigonometric, rational and exponential hyperbolic solitary forms confirmed many physical phenomena’s. We deduce several types of solutions that include bright optical and dark solitons, which are very important from a physical point of
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Investigation of exact soliton solutions in magneto-optic waveguides and its stability analysis Results Phys. (IF 4.019) Pub Date : 2021-01-04 Usman Younas; Jingli Ren
This paper deals the propagation of waves through magneto-optic waveguides which are modeled by the generalized vector nonlinear Schrodinger’s equation (NLSE). Two types of nonlinearities namely quadratic-cubic (QC) and dual-power laws are studied by implementing authentic mathematical technique called extended Fan-sub equation (EFSE) method. We secure the exact solutions in the forms of Jacobi’s elliptic
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