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Nonreciprocal transmission in composite structure with Weyl semimetal defect layer Z. Naturforschung A (IF 1.8) Pub Date : 2024-03-14 Xin Chen, Guanxia Yu, Haodong Wang
A two-unit symmetrical composite structure with the WSMs defect layer was designed. The energy band and transmission properties are studied based on the transfer matrix theory. Due to the WSMs with the property of time-reversal breaking, the nonreciprocal Tamm states for forward and backward incidence are excited in the interface of the symmetrical composite structure. The numerical results show that
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Effect of zinc doping on structural, bonding nature and magnetic properties of co-precipitated magnesium–nickel ferrites Z. Naturforschung A (IF 1.8) Pub Date : 2024-03-06 Kannan Balakrishnan Yelai, Muthaian Charles Robert, Abinaya Nandagopal
This paper describes the electronic structure, bonding nature and magnetic properties of Mg0.5Ni0.5−x Zn x Fe2O4 (x = 0.1, 0.2, 0.3, 0.4) nano-spinel ferrite samples synthesized by the co-precipitation method. Spinel structure with Fd 3 ̄ $\bar{3}$ m space group is confirmed by XRD analysis with trace amounts of hematite. The results of XRD and FTIR confirm the formation of spinel structure. The estimated
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Calibration-free approaches for quantitative analysis of a brass sample Z. Naturforschung A (IF 1.8) Pub Date : 2024-03-06 Vikas Gupta, Abhishekh Kumar Rai, Tejmani Kumar, Akash Kumar Tarai, Manoj Kumar Gundawar, A. K. Rai
Calibration-free laser-induced breakdown spectroscopy (CF-LIBS) is successfully employed to determine the chemical composition of brass samples using the LIBS technique. The sample is irradiated with a Q-switched Nd: YAG laser with a pulse width of 5 ns to generate laser-induced plasma (LIP) on the sample surface. The time evolution spectra were recorded from the surface of the brass sample only with
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Analysis of microstrip low pass filter at terahertz frequency range in finite difference time domain method for radar applications Z. Naturforschung A (IF 1.8) Pub Date : 2024-03-06 K. S. Lavanya, N. Vijayalakshmi, S. Preethi
Terahertz Technology is a promising newer technology for various applications in wireless and radar communication namely tracking and detecting radar targets. The challenging aspect of radar transmitters in the target detection process is spurious harmonic signals that affect the communication path between radar transceivers. The spurious signal can be neglected by a strong filtering method. Filtering
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Robust inverse scattering analysis of discrete high-order nonlinear Schrödinger equation Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-24 Xue-Wei Yan, Yong Chen, Xin Wu
In this study, we present the rigorous theory of the robust inverse scattering method for the discrete high-order nonlinear Schrödinger (HNLS) equation with a nonzero boundary condition (NZBC). Using the direct scattering problem, we deduce the analyticity, symmetries, and asymptotic behaviors of the Jost solutions and scattering matrix. We also formulate the inverse scattering problem using the matrix
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Novel compound multistable stochastic resonance weak signal detection Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-23 Shangbin Jiao, Qiongjie Xue, Na Li, Rui Gao, Gang Lv, Yi Wang, Yvjun Li
The research on stochastic resonance (SR) which is used to extract weak signals from noisy backgrounds is of great theoretical significance and promising application. To address the shortcomings of the classical tristable SR model, this article proposes a novel compound multistable stochastic resonance (NCMSR) model by combining the Woods–Saxon (WS) and tristable models. The influence of the parameters
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Atom-bond-connectivity (ABC) indices of graphene sheets, zigzag single walled carbon nanotubes and single walled carbon nanotori Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-21 Soukat Ghosh, Uday Maji, Swapnadeep Mondal, Bholanath Mandal
Atom-bond-connectivity (ABC) indices are obtained in analytical forms for graphene sheets, zigzag single walled carbon nanotubes (SWCNTs), and single walled carbon nanotori in terms of number of rings (r) that measures the length and the number of hexagons in between two rings (h) that dictates the width of the concerned systems. The procedures followed for ABC index have been used to obtain the expressions
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Two curvature sensors based on no-core–seven-core fiber interference Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-19 Yifan Ran, Siyao Niu, Shishi Xu, Wenlin Feng, Pengming Cheng
Using the no-core fiber (NCF)–seven-core fiber (SCF) interference structure, two curvature sensors of Michelson interference type and Mach–Zehnder interference (MZI) type are proposed, respectively. The curvature sensor based on Michelson interference shows wavelength-modulation characteristics, the sensitivity is about −22.76 nm/m−1 with a linearity of 0.9823, the temperature sensitivity is only 0
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The effects of viscosity on the structure of shock waves in a van der Waals gas Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-19 Raj Kumar Anand, Sewa Singh
The structure of viscous shock-front has been investigated in a van der Waals gas between the boundary conditions for x = −ε and x = +ε considering the flow of a gas to be viscous and one-dimensional. The exact solutions for the flow parameters, fluid velocity, pressure, temperature, and change-in-entropy in the shock transition region have been found in view of the equation of state for van der Waals
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Investigation of 90,92Zr(n,γ)91,93Zr in the s-process nucleosynthesis Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-19 Abdul Kabir, Zain Ul Abideen, Jameel-Un Nabi, Dawar Khan
The neutron capture rates and Maxwellian-averaged cross-sections (MACS) for 90Zr(n,γ)91Zr and 92Zr(n,γ)93Zr processes have been computed within the framework of Talys v1.96. The effects of phenomenological nuclear level density (NLD) parameters and the gamma strength functions (GSFs) on Maxwellian-averaged cross-sections and neutron capture rates are examined both quantitatively and qualitatively.
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Traveling wavefronts in an anomalous diffusion predator–prey model Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-14 Asmaa H. Abobakr, Hussien S. Hussien, Mahmoud B. A. Mansour, Hillal M. Elshehabey
In this paper, we study traveling wavefronts in an anomalous diffusion predator–prey model with the modified Leslie–Gower and Holling-type II schemes. We perform a traveling wave analysis to show that the model has heteroclinic trajectories connecting two steady state solutions of the resulting system of fractional partial differential equations and corresponding to traveling wavefronts. This also
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Enhancing charge transport and photoluminescence characteristics via transition metals doping in ITO thin films Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-08 Ghazi Aman Nowsherwan, Muhammad Ahmad, Rub Nawaz Bhuttee, Maryam Tahir, Muhammad Azhar, Sabah Haider, Nadia Anwar, Muhammad Bilal, Sabeen Ameen, Syed Sajjad Hussain, Saira Riaz, Shahzad Naseem
This study presents the synthesis and characterization of pristine and transition metal (Co, Fe, and Zr)-doped indium tin oxide (ITO) thin films fabricated via RF magnetron sputtering. The effect of transition metal doping on ITO thin films properties was comprehensively examined using numerous spectroscopic and microscopic methods such as XRD, FTIR, and SEM coupled with EDX, UV–visible and PL spectroscopy
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Investigations on the EPR parameters and local structures for the substitutional Ti3+ and W5+ centers in stishovite Z. Naturforschung A (IF 1.8) Pub Date : 2024-02-08 Fu Chen, Zifa Zhou, Jin Zhang, Cuidi Feng
Local structures and electron paramagnetic resonance (EPR) parameters (g factors g x , g y , and g z ) for the substitutional Ti3+ and W5+ centers in stishovite are theoretically investigated by using the high-order perturbation formulas of these parameters for a d1 ion in rhombically compressed octahedra. In the calculation formulas, the related molecular orbital coefficients are obtained from the
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Concept of introverted space: is multidimensional, extroverted space an illusion? Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-31 Ingo Steinbach
The quantum-phase-field concept of matter is revisited with special emphasis on the introverted view of space. Extroverted space surrounds physical objects, while introverted space lies in between physical objects. Space between objects leads to a network structure of matter: a network in which one-dimensional spaces connect individual particles.
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Unveiling the luminescence property of Pr-incorporated barium cerate perovskites for white LED applications Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-29 Jasira Seere Valappil, Veena Vannadil Puthiyaveetil, Shilpa Cherlan Kottianmadathil, Huda Thasneem Abdul Majeed, Nissamudeen Kavukuzhi Meerasahib
The various structural and conductive attributes of barium cerate, BaCeO3 position it as a highly promising matrix for energy storage purposes. The current study illustrates that barium cerate can be effectively tailored by introducing trivalent praseodymium ions, thereby enhancing its optical properties as well. In this work, single-phased orthorhombic crystalline powders of barium cerate incorporated
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Quantum-mechanical treatment of two particles in a potential box Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-22 Gottfried Mann
In classical physics, there is a basic principle, namely “A particle cannot be located at the position of another one on the same time.” Which consequences can be derived if this principle is transferred into quantum physics? For doing that, two distinguishable particles are considered to be trapped in a potential box by means of the Schrödinger equation. In result, the particles can necessarily be
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Evaluation of weak discontinuity in rotating medium with magnetic field, characteristic shock and weak discontinuity interaction Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-18 Gorakh Nath, Prakash Upadhyay
In this article we investigated the characteristic shock and weak discontinuity wave in a rotating medium of perfect gas in the case of one-dimensional (1-D) adiabatic motion under an axial magnetic field governed by the system of PDEs (partial differential equations). We have obtained some classes of analytical solutions of the system of PDEs that demonstrates the time-space dependency. With change
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Quadruple Beltrami field structures in electron–positron multi-ion plasma Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-11 Farhat Saleem, Muhammad Iqbal, Usman Shazad
A quadruple Beltrami (QB) equilibrium state for a four-component plasma that consists of inertial electrons, positrons, lighter positive (H +) ions and heavier negative ions O 2 − $\left({\mathrm{O}}_{2}^{-}\right)$ is derived and investigated. The QB relaxed state is a linear superposition of four distinct single Beltrami fields and provides the possibility of the formation of four self-organized
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Bifurcation and stability analysis of atherosclerosis disease model characterizing the anti-oxidative activity of HDL during short- and long-time evolution Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-08 Asish Adak, Debasmita Mukherjee, Praveen Kumar Gupta
In this article, a partial differential equation (PDE) model for atherosclerosis disease is presented that analyzes the anti-oxidative activity of high-density lipoprotein (HDL) during the reverse cholesterol transport (RCT) process. The model thoroughly investigates the complex interplay between oxidized low-density lipoprotein (ox-LDL) and high-density lipoprotein in the context of atherosclerosis
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New expressions for the Aharonov–Bohm phase and consequences for the fundamentals of quantum mechanics Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-08 Alexander Kholmetskii, Tolga Yarman, Oleg Missevitch
We focus on new expressions for the Aharonov–Bohm (AB) phase proposed recently by C. Marletto and V. Vedral (Phys. Rev. Lett. 125, 040401 (2020)) and by our team (A. L. Kholmetskii et al., Ann. Phys., 434, 168627 (2021)). We emphasize the mismatch between the standard expression for the electric component of the AB phase and the expression by Marletto and Vedral for this component, which, as we show
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Magnetoacoustics and magnetic quantization of Fermi states in relativistic plasmas Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-08 Ahsan Iqbal, Abdur Rasheed, Areeb Fatima, Sumera Perveen, Bilal Ramzan, Muhammad Jamil
Dispersive characteristics of electromagnetic sound waves with frequencies less than the electron and ion gyro-frequencies are studied herein analytically and numerically at astrophysical scales. Magnetic quantization of Fermi states is concerned with the degenerate relativistic electrons fluid treated by quantum hydrodynamic model (QHD). The quantum features are included from Landau quantized Fermi
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Three-to-one internal resonances of stepped nanobeam of nonlinearity Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-05 Mustafa Oguz Nalbant, Süleyman Murat Bağdatli, Ayla Tekin
In this study, vibrations of stepped nanobeams were investigated according to Eringen’s nonlocal elasticity theory. Multi-time scale method, which is one of the perturbation methods, has been applied to solve dimensionless state equations. The solution is considered in two steps. First-order terms obtained from the perturbation expansion formed the linear problem in the first step. In the second step
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Red luminescence properties of Na5Y(WO4)4 doped with Eu3+ and alkali metal ions Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-03 Chenyuan Yuan, Guoying Feng, Qiangshen Chen
Na5Y(WO4)4: 6 % Eu3+, 6 % R+ (R = Li, Na, K) phosphors were synthesized using a high-temperature solid-state reaction method. Through a series of characterization methods, the crystal structure, morphology, composition, and luminescence properties of the sample are obtained. At the same time, the properties of Na5Y(WO4)4: Eu3+ phosphor added with alkali metal ions such as Li+, Na+, K+ were also studied
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Extended calculations of energy levels and transition rates for Yb LVII Z. Naturforschung A (IF 1.8) Pub Date : 2024-01-03 Feng Hu, Yan Sun, Maofei Mei, Yufei Lu, Miao Wu, Zhi Feng Yin
Extended energy levels and transition data for the Yb LVII are calculated with the GRASP2018 package, which is based on the multiconfiguration Dirac–Hartree–Fock and relativistic configuration methods. Complete and consistent data sets of energy levels, transition rates and lifetimes for electric-dipole (E1), electric-quadrupole (E2), magnetic-dipole (M1), and magnetic-quadrupole (M2) transitions among
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The absorbing boundary conditions of Newtonian fluid flowing across a semi-infinite plate with different velocities and pressures Z. Naturforschung A (IF 1.8) Pub Date : 2023-12-21 Lin Liu, Jiajia Li, Jingyu Yang, Jihong Wang, Yu Wang, Siyu Chen, Libo Feng, Chiyu Xie, Jing Zhu
The Newtonian fluid flowing across a semi-infinite plate with variable velocity and pressure is considered in this work. The dimensionless governing equation is obtained by introducing the dimensionless quantities. For infinite region, the artificial boundary approach by using the Laplace transform is applied to gain the absorbing boundary condition (ABC) in a finite region which we call the inner
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Effect of wiggler magnetic field on wakefield excitation and electron energy gain in laser wakefield acceleration Z. Naturforschung A (IF 1.8) Pub Date : 2023-12-20 Vivek Sharma, Sandeep Kumar, Niti Kant, Vishal Thakur
Laser wakefield acceleration is a frequently utilised research methodology for enhancing the energy levels of lighter charged particles, specifically electrons, to relativistic magnitudes. In this investigation, we utilised a linear polarised Gaussian-like laser pulse that propagated along the z-axis through cold collisionless underdense plasma in weakly nonlinear regime. An external planer magnetic
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Environmentally friendly reduction of graphene oxide using the plant extract of novel Chromolaena odorata and evaluation of adsorption capacity on methylene blue dye Z. Naturforschung A (IF 1.8) Pub Date : 2023-12-20 Parvathi Edayillam, Dilraj Nidooli, Arjun Ganesh, Akshaya Chalil Veettil, Deepak Nangarath Kannoth
Chromolaena odorata is an extremely allelopathic and commonly available herb that conquers neighbouring vegetation, and research is being conducted to utilize it for a wide diversity of applications. In the current study, methylene blue dye (MB) is decomposed by exploring the suitability of novel C. odorata for achieving reduced graphene oxide (RGO) through a simplistic green synthesis method. C. odorata
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Optoelectronics and thermoelectric performances in CuX (X = F, Cl, Br, and I) Z. Naturforschung A (IF 1.8) Pub Date : 2023-12-18 Torkia Ghellab, Zoulikha Charifi, Hakim Baaziz, Nadjia Latelli
The current study focused on examining the structural, mechanical, and optoelectronic properties of CuF, CuCl, CuBr, and CuI by the utilisation of the FP-LAPW method. The calculations reveal that GGA is a better fit than LDA for evaluating structural characteristics, including lattice parameters and bulk modulus. The examination of the band structure reveals that CuF exhibits metallic behaviour, whilst
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Uncovering flow dynamic behaviors underlying oil–gas–water three phase flow using multivariate synchrosqueezing transform Z. Naturforschung A (IF 1.8) Pub Date : 2023-12-04 Lei OuYang, Weikai Ren, Ningde Jin
Oil-gas-water three-phase flow is distinguished by its intricate flow pattern. The analysis of experimental observations to reveal the oil-gas-water three phase flow’s dynamic behavior remains a challenging task. In this paper, firstly, a simulation investigation to compare the multivariate pseudo-winger distribution (MPWD) and multivariate synchrosqueezing transform (MSST) is presented. The cross
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An approach without partial wave expansion to calculate scattering of spin-0 and spin- 1 2 $\frac{1}{2}$ particles in high energy regions and those governed by long range interactions Z. Naturforschung A (IF 1.8) Pub Date : 2023-12-04 Imam Fachruddin, Agus Salam
Scattering of spin-0 and spin- 1 2 $\frac{1}{2}$ particles is formulated in momentum space based on basis states being not expanded in partial waves. No sequential calculations with increasing angular momentum are performed to reach physical convergence, which depends on the scattering energy and the interaction range. Both nonrelativistic and relativistic cases are described. We put forward for consideration
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Single-step synthesis of ZnO nanoparticles using a phytosynthesis route and its characterization Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-30 Ankita Nandi, Himanshu Sachin Giram, Vishnu Pratap Patel, Ritam Mehera, Satadruta Das, Deokrishna Kumar Choudhary, Abdur Rahman, Dipanjan Saha, Paramesh Chandra, Man Singh, Naznin Ara Begum, Swapan Kumar Mandal, Chandan Kumar Jana, Nilanjana Das
Green synthesis of nanoparticles (NPs) is superior to conventional physical and chemical methods and increasingly becoming the preferred mode of synthesis nowadays. We report a method for phytosynthesis of ZnO NPs and their characterization for plausible diverse applications. ZnO NPs was synthesized using an extract of the leaves of Tagetes erecta L. (marigold), with optimum synthesis at a ratio of
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Porosity effects on the dynamic response of arbitrary restrained FG nanobeam based on the MCST Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-27 Büşra Uzun, Mustafa Özgür Yaylı
In this study, two different general eigenvalue problems for nanobeams made of functionally graded material with pores in their sections according to Rayleigh beam theory using modified couple stress theory are established. Fourier sine series and Stokes transformation are used for the solution. First, the partial differential equation of motion of the problem is discretized into an ordinary differential
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Excitation of proton firehose instability in magnetospheric cold and hot proton plasma: a quasilinear approach Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-27 Muhammad Rashid, Muhammad Sarfraz, Muhammad Ahsan Shahzad, Muhammad Bilal, Aman ur-Rehman
Unstable states of different charged species in the solar wind and Earth’s magnetosphere are governed with the collective and collisional processes. For these dilute plasmas, the contribution of microinstabilities driven by the anisotropic particle distribution and heat flux becomes important in defining the stable/equilibrium states of electrons and ions/protons. The present paper highlights the key
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Magneto- and barocaloric properties of the ferro-antiferromagnetic sawtooth chain Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-27 Nico Reichert, Henrik Schlüter, Tjark Heitmann, Johannes Richter, Roman Rausch, Jürgen Schnack
Materials that are susceptible to pressure and external magnetic fields allow the combined use of both for caloric processes. Here we report investigations of the ferromagnetic-antiferromagnetic sawtooth chain that due to its critical behavior not only allows for both barocaloric as well as magnetocaloric processes but also features very large cooling rates in the vicinity of the quantum critical point
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Arbitrary maximally entangled quantum prisoner’s dilemma Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-24 Abd El-Hakeem E. H. Abd El-Naby, Heba A. Elrayes, Ahmed M. K. Tarabia, Ahmed S. Elgazzar
The maximally entangled (ME) Eisert–Wilkens–Lewenstein (EWL) quantization scheme efficiently solves the classical prisoner’s dilemma (PD). Despite the intensive research on the EWL scheme, little is known about the role of the arbiter in controlling the scheme properties. We redefine the EWL scheme by introducing an arbitrary phase shift into the ME initial state. Four basic initial states were analyzed
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Electrical and magnetic properties of MF/CuAl nanocomposites Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-24 Khaled Roumaih
This study investigated the effects of CuAl2O4 (CuAl) on four types of spinel ferrites: CoFe2O4 (CoF), NiFe2O4 (NiF), MgFe2O4 (MgF), and ZnFe2O4 (ZnF) with regards to their electrical characteristics and microscopic magnetic behavior. According to the Seebeck coefficient (φ), the nanocomposites have a mixture of positive and negative charge carriers, except for CoF/CuAl, which has a positive charge
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Multilayer designs comprising zirconium nitride and perovskites as a novel angular plasmonic biomedical sensor Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-17 Abdulkarem H. M. Almawgani, Walied Sabra, Ali Hajjiah, Hussein A. Elsayed, Ahmed Mehaney, Ghassan Ahmed Ali, Yahya Ali Abdelrahman Ali, Wael S. Mohamed, Ashour M. Ahmed
In this paper, a comparison between different configurations of surface plasmon resonance (SPR) biosensors has been theoretically conducted to improve the performance of the designed biosensor. The proposed biosensor configurations contain zirconium nitride (ZrN) as an alternative plasmonic material, which comprises different perovskite materials (KNbO3, LiTaO3, LiNbO3, SrTiO3, and BaTiO3) in the visible
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Tailoring of optical band gap in carbon-doped TiO2 nanofibers Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-17 Javeria Arshad, Muqarrab Ahmed, Nadia Anwar, Shaheen Irfan, Nazia Iram, Ghazi Aman Nowsherwan, Rabia Khalid, Bushra Anwar, Fouzia Anwar
The study intended to enhance the visible light activity of titanium dioxide (TiO2) by doping it with carbon, thereby reducing its effective band gap. Carbon-doped TiO2 nanofibers were synthesized using a simple electrospinning process. The prepared samples were then characterized to investigate their properties. X-ray diffraction (XRD) analysis confirmed the presence of the rutile phase of TiO2 in
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Nonlinear vibration of microbeams subjected to a uniform magnetic field and rested on nonlinear elastic foundation Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-13 Süleyman Murat Bağdatlı, Necla Togun, Burak Emre Yapanmış, Şevki Akkoca
This study investigates the nonlinear vibration motions of the Euler–Bernoulli microbeam on a nonlinear elastic foundation in a uniform magnetic field based on Modified Couple Stress Theory (MCST). The effect of size, foundation, and magnetic field on the nonlinear vibration motion of microbeam has been examined. The governing equations related to the nonlinear vibration motions of the microbeam are
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Polar-plane flow in porous annular ducts with accelerated rotating walls. A region of stagnation inside the fluid Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-09 Serge Benjamin Mbam Mbam, Maurice Lamara, Noé Richard Makon, Elisabeth Ngo Nyobe, Elkana Pemha
The steady laminar flow of an incompressible Newtonian fluid in a porous annular duct with accelerated rotating walls is investigated. The flow is located in the polar plane and is driven by suction and injection at the walls. As required by conservation of mass with zero axial velocity, the fluid is injected into one of the cylinders, which becomes the upstream cylinder, and suctioned into the other
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Green creation of CoFe2O4 nanosorbent for superior toxic Cd ions elimination Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-08 Laila S. Alqarni
A mesoporous cobalt ferrite nanostructure was prepared by a green chemistry approach using Pimpinella anisum extract for Cd (II) ions elimination from an aqueous medium. The metal ions adsorption was explored under varying operating conditions, comprising of the pH, initial adsorbate concentration, and contact time. The synthesized sorbent was characterized by various techniques where the XRD data
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Photocatalytic decomposition of Congo red dye by black paste@TiO2 as an efficient recyclable photocatalyst Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-03 Monira Galal Ghoniem, Mohamed Ali Ben Aissa, Fatima A. Adam, Walid M. Daoush, Mohamed Khairy
Manufacturing active and economical catalysts and using them in water treatment is one of the most important challenges facing researchers. Spent batteries signify a source of harmful materials when discarded without suitable treatment. In this work, a black paste as one of the main components of spent battery doped with different ratios of TiO2 nanocomposites (0, 1, 3, 7, and 10 %) were manufactured
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Bargmann transform and statistical properties for nonlinear coherent states of the isotonic oscillator Z. Naturforschung A (IF 1.8) Pub Date : 2023-11-01 Ghayth Ouirdani, Othmane El Moize
We construct a new class of nonlinear coherent states for the isotonic oscillator by replacing the factorial of the coefficients z n / n ! ${z}^{n}/\sqrt{n!}$ of the canonical coherent states by the factorial x n γ ! = x 1 γ . x 2 γ … x n γ ${x}_{n}^{\gamma }!={x}_{1}^{\gamma }.{x}_{2}^{\gamma }\dots {x}_{n}^{\gamma }$ with x 0 γ = 0 ${x}_{0}^{\gamma }=0$ , where x n γ ${x}_{n}^{\gamma }$ is a sequence
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Relativistic Ŝ-matrix formulation in one dimension for particles of spin-s (s = 0, 1/2) Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-30 Nahla Bourouis, Kamel Khounfais, Meheiddine Bouatrous
In quantum scattering theory, the time evolution of a physical system can be described as a series of unitary transformations. The operator of this transformation will be denoted S ̂ $\hat{\boldsymbol{S}}$ ; the corresponding matrix is the Ŝ-matrix (scattering matrix). This last object contains all the information on the broadcast process associated with the operator S ̂ $\hat{\boldsymbol{S}}$ The
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Nonlinear optical response of Li n ClK (n = 1–6) superalkali clusters Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-30 Şükrü Şentürk, Yavuz Ekincioğlu, Ümit Doğan
The geometrical structures, stabilities, electronic properties and nonlinear optical response of the halogen doped bimetallic Li n ClK (n = 1–6) clusters were studied within the density functional theory. Based on the dissociation energy, second order energy difference and GH-L (HOMO-LUMO gap), the Li n ClK (n = 2, 4, 6) clusters are more stable. According to their ionization energies, the clusters
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Delta-shock for the Chaplygin gas Euler equations with source terms Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-27 Shiwei Li
This article discusses the Riemann problem for the Chaplygin gas Euler equations that include the presence of two source terms. By means of variable substitution, two kinds of non-self-similar Riemann solutions involving delta-shock are constructed explicitly. For the delta-shock, the generalized Rankine–Hugoniot relations and the over-compressive entropy condition are clarified. Moreover, the position
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Zirconia nanoparticles unveiled: multifaceted insights into structural, mechanical, and optical properties Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-25 Iqra Abbas, Nadia Anwar, Muqarrab Ahmed, Muhammad Naeem, Ghazi Aman Nowsherwan, Shaheen Irfan, Rabia Khalid, Nazia Iram, Bushra Anwar, Muhammad Ahmad
This work reports the sol–gel synthesis of zirconia (ZrO2) nanoparticles (NPs) in which the effect of varying molarities of zirconium oxychloride salt (such as 0.025 M, 0.050 M, 0.075 M, 0.100 M, and 0.125 M) has been investigated on the structural, mechanical, and optical characteristics by maintaining a basic pH at 9. All experimental conditions were conducted using basic media, with XRD, SEM, hardness
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Artificial intelligence approach to analyze SIMS profiles of 11B, 31P and 75As in n- and p-type silicon substrates: experimental investigation Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-19 Walid Filali, Mohamed Boubaaya, Elyes Garoudja, Fouaz Lekoui, Ibrahime Abdellaoui, Rachid Amrani, Slimane Oussalah, Nouredine Sengouga
In this work, we report an effective approach based on an artificial intelligence technique to investigate the secondary ions mass spectroscopy (SIMS) profiles of boron, phosphorus and arsenic ions. Those dopant ions were implanted into n- and p-type (100) Silicon substrate using the ion implantation technique with energy of 100 and 180 keV. Annealing treatment was conducted at various temperatures
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Eco-conscious nanofluids: exploring heat transfer performance with graphitic carbon nitride nanoparticles Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-18 Vijayakumar Gokul, Mohanachandran Nair Sindhu Swapna, Sankaranarayana Iyer Sankararaman
The work explores the heat transfer capabilities of semiconducting graphitic carbon nitride (g-C3N4) nanofluids. Also, it presents a sustainable and eco-friendly method for synthesizing g-C3N4 nanoparticles using commercially available rice flour as a natural carbon precursor through hydrothermal treatment. The synthesized sample subjected to various characterizations, including analysis of their structure
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Nambu Jona-Lasinio model of relativistic superconductivity Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-18 Stanley A. Bruce
We propose a Nambu Jona-Lasinio (NJL) effective model of relativistic superconductivity. In this framework, we discuss possible electromagnetic (EM) behaviors of (specifically) type-II superconductivity in line with the nonrelativistic Ginzburg–Landau (GL) theory. We comment on possible solitonic solutions of this model. Our investigation could be of relevance to describe type-II proton superconductivity
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Kelvin–Helmholtz instability in magnetically quantized dense plasmas Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-16 Abdur Rasheed, Asif Nazir, Areeb Fatima, Bilal Ramzan, Zubia Kiran, Muhammad Jamil
This study deals with the instability of shear waves, also known as Kelvin–Helmholtz instability, propagating with a complex frequency ”ω” in magnetically quantized dense gyro-viscous plasmas. The instability arises from the transverse spatial shear of the streaming velocity, which evolves from the DC electric and magnetic fields. In dense plasmas, quantum effects contribute through magnetically quantized
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The effect of dust streaming on arbitrary amplitude solitary waves in superthermal polarized space dusty plasma Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-12 Syeda Neelam Naeem, Anisa Qamar, Ata-ur Rahman, Wedad Albalawi
The impact of dust streaming and polarization force on dust acoustic solitary waves (DASWs) is examined in a non-magnetized dusty plasma made up of negatively charged dust, superthermal ions, and Maxwellian electrons. In the linear limit, the dispersion relation is derived and numerically analyzed. In order to explore the characteristics of arbitrary amplitude DASWs, a Sagdeev potential technique is
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Why does momentum depend on inertia? Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-12 Fulvio Melia
Momentum is characterized in terms of inertial mass for particles moving at less than the speed of light, but entirely in terms of their energy for those lacking inertia. Does this difference suggest a physically distinct origin of momentum in the two cases and, if so, what is actually being conserved in interactions involving both types of particle? In this paper, we consider a recently proposed gravitational
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Unveiling transport properties in rare-earth-substituted nanostructured bismuth telluride for thermoelectric application Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-09 Muhammad Waqas, Abdul Shakoor, Muhammad Nadeem, Ghazi Aman Nowsherwan, Ahmar Ali, Muhammad Fasih Aamir, Shahbaz Younas Bhatti, Ahmed Bilal, Anis Ur Rehman
Thermoelectrics is an emerging technology in the field of renewable energy sources, and the exploration of doped materials has opened up new avenues for enhancing their performance. La-doped thermoelectric materials with the composition Bi2−x La x Te3 (x = 0.0, 0.1, 0.2, 0.3, 0.4) were synthesized using the WOWS sol–gel method and sintered at 500 °C for 5 h. X-ray diffraction analysis confirmed a rhombohedral
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The transmittance properties of the one-dimensional gyroidal superconductor photonic crystals Z. Naturforschung A (IF 1.8) Pub Date : 2023-10-07 Hussein A. Elsayed, Chandra Sekhar Mishra, Abdulkarem H. M. Almawgani, Yahya Ali Abdelrahman Ali, Ahmed Mehaney
In this study, the transfer matrix method is used to analyze the optical properties of a layered structure, {Air(SrTiO3/BSCCO)20Substrate}, consisting of air, SrTiO3, BSCCO (bismuth strontium calcium copper oxide) bilayers, and a substrate. This paper aims to investigate the transmittance spectra of two proposed one-dimensional (1D) structures, including a conventional superconductor photonic crystal
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Synthesis, structure, and luminescence properties of double perovskites Ba2.9Sr0.1WO6: Eu3+ red emitting phosphor Z. Naturforschung A (IF 1.8) Pub Date : 2023-09-28 Arif Ullah, Jinghao Zhuang, Zheng Liu, Xiaozhan Yang, Wenlin Feng
In this work, the phosphors of Eu3+ ions doped Ba2.9Sr0.1WO6 were successfully synthesized by the high-temperature solid-state method. The luminescence properties, including the emission and excitation spectra, fluorescent lifetimes, and CIE chromaticity coordinates were characterized. The crystal structure and composite of the samples were investigated by XRD (X-ray diffraction), and HRTEM (high-resolution
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Low-temperature small-angle electron-electron scattering rate in Fermi metals Z. Naturforschung A (IF 1.8) Pub Date : 2023-09-25 Andrew Das Arulsamy
Low-temperature elementary conductivity formula in Fermi metals is reviewed starting from Ohm’s law. This provides the background needed to understand why and how the equations exploited are complicated due to effective mass effect and complex scattering rate even in the presence of small-angle electron-electron scattering at low temperatures. Using the mathematical conditions and physical arguments
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On the limitations of the complex wave velocity for the heterogeneous swirling flows Z. Naturforschung A (IF 1.8) Pub Date : 2023-09-25 Prakash Shanmugam
The hydrodynamic instability of variable density swirling flows under gravity between two infinite coaxial cylinders is investigated for axisymmetric disturbances. It is shown that the complex wave velocity of any arbitrary unstable axisymmetric mode must lie within the semi-elliptical region whose minor axis depends on the density stratification parameter J(r). The stabilizing effect of density stratification
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Theoretical investigation on the elastic and mechanical properties of high-entropy alloys with partial replacement of Sc in Hf0.25Ti0.25Zr0.25Sc0.25−x Al x (x ≤ 15 %) Z. Naturforschung A (IF 1.8) Pub Date : 2023-09-14 Ajit Kumar Maddheshiya, Shakti Pratap Singh, Devraj Singh, Phool Singh Yadav, Raja Ram Yadav, Thakur Prasad Yadav
The theoretical assessment of mechanical and elastic properties is used to analyze the distinctive properties of high entropy alloys (HEAs) at room temperature. Using Lennard–Jones potential model, the second order elastic constants (SOECs) and third order elastic constants (TOECs) have been determined for the HEAs Hf0.25Ti0.25Zr0.25Sc0.25−x Al x (x ≤ 15 %) in their hexagonal close-packed (hcp) phases
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Similarity solutions for cylindrical shock wave in a self-gravitating and rotating gas under the influence of monochromatic radiation and azimuthal or axial magnetic field by using Lie invariance method Z. Naturforschung A (IF 1.8) Pub Date : 2023-09-12 Vidit K. Vats, Dheerendra B. Singh, Danish Amin
The group invariance technique is used to investigate the similarity solution of one-dimensional, unsteady motion of cylindrically symmetric shock waves propagating in a rotating, axisymmetric perfect gas permeated with an azimuthal or axial magnetic field, under the effect of monochromatic radiation, with or without self-gravitational effects. The density is considered to be varying with radiation