Subjects -> PHYSICS (Total: 857 journals)
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    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (53 journals)
    - OPTICS (92 journals)
    - PHYSICS (625 journals)
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PHYSICS (625 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 741 Journals sorted alphabetically
Acta Acustica     Open Access   (Followers: 4)
Acta Mechanica     Hybrid Journal   (Followers: 22)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Advanced Composite Materials     Hybrid Journal   (Followers: 75)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 72)
Advanced Materials     Hybrid Journal   (Followers: 261)
Advanced Quantum Technologies     Hybrid Journal   (Followers: 3)
Advanced Science Focus     Free   (Followers: 6)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 2)
Advanced Studies in Theoretical Physics     Open Access   (Followers: 5)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advances in Clinical Radiology     Full-text available via subscription   (Followers: 4)
Advances in Condensed Matter Physics     Open Access   (Followers: 5)
Advances in Geophysics     Full-text available via subscription   (Followers: 7)
Advances in High Energy Physics     Open Access   (Followers: 23)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 4)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 33)
Advances in Natural Sciences : Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in OptoElectronics     Open Access   (Followers: 7)
Advances In Physics     Hybrid Journal   (Followers: 29)
Advances in Physics : X     Open Access   (Followers: 4)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Remote Sensing     Open Access   (Followers: 59)
Aggregate     Open Access   (Followers: 2)
AIP Advances     Open Access   (Followers: 7)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 2)
American Journal of Condensed Matter Physics     Open Access   (Followers: 7)
American Journal of Signal Processing     Open Access   (Followers: 14)
Anales (Asociación Física Argentina)     Open Access  
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 9)
Annalen der Physik     Hybrid Journal   (Followers: 5)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 21)
Annales Henri Poincaré     Hybrid Journal   (Followers: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 6)
Annals of Physics     Hybrid Journal   (Followers: 7)
Annals of West University of Timisoara - Physics     Open Access   (Followers: 1)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 12)
Annual Review of Condensed Matter Physics     Full-text available via subscription   (Followers: 3)
Annual Review of Materials Research     Full-text available via subscription   (Followers: 8)
APL Materials     Open Access   (Followers: 12)
Applied Composite Materials     Hybrid Journal   (Followers: 54)
Applied Mathematics and Physics     Open Access   (Followers: 2)
Applied Physics A     Hybrid Journal   (Followers: 15)
Applied Physics Frontier     Open Access   (Followers: 2)
Applied Physics Letters     Hybrid Journal   (Followers: 45)
Applied Physics Research     Open Access   (Followers: 5)
Applied Physics Reviews     Hybrid Journal   (Followers: 11)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 4)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 4)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 2)
Asia Pacific Physics Newsletter     Hybrid Journal   (Followers: 1)
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
ASTRA Proceedings     Open Access   (Followers: 3)
Astronomy & Geophysics     Hybrid Journal   (Followers: 50)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 39)
Atoms     Open Access   (Followers: 1)
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 15)
Axioms     Open Access   (Followers: 1)
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 1)
Biomaterials     Hybrid Journal   (Followers: 55)
Biomedical Imaging and Intervention Journal     Open Access   (Followers: 5)
Biophysical Reviews     Hybrid Journal   (Followers: 2)
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 5)
BJR|Open     Open Access  
Boson Journal of Modern Physics     Open Access   (Followers: 9)
Brazilian Journal of Physics     Hybrid Journal  
Bulletin of Materials Science     Open Access   (Followers: 44)
Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics     Open Access  
Bulletin of the Atomic Scientists     Hybrid Journal   (Followers: 7)
Bulletin of the Lebedev Physics Institute     Hybrid Journal  
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal   (Followers: 1)
Caderno Brasileiro de Ensino de Física     Open Access  
Canadian Journal of Physics     Hybrid Journal   (Followers: 11)
Cell Reports Physical Science     Open Access  
Cells     Open Access   (Followers: 2)
CERN courier. International journal of high energy physics     Free   (Followers: 8)
Chemical Physics Impact     Full-text available via subscription  
ChemPhysMater     Full-text available via subscription  
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Chinese Journal of Physics     Hybrid Journal   (Followers: 1)
Ciencia     Open Access  
Clinical Spectroscopy     Open Access   (Followers: 1)
Cogent Physics     Open Access  
Colloid Journal     Hybrid Journal   (Followers: 3)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Communications Materials     Open Access  
Communications Physics     Open Access  
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 185)
Composites Part B : Engineering     Hybrid Journal   (Followers: 229)
Composites Part C : Open Access     Open Access   (Followers: 2)
Computational Astrophysics and Cosmology     Open Access   (Followers: 7)
Computational Condensed Matter     Open Access   (Followers: 1)
Computational Materials Science     Hybrid Journal   (Followers: 26)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 5)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computer Physics Communications     Hybrid Journal   (Followers: 9)
Condensed Matter     Open Access   (Followers: 2)
Contemporary Physics     Hybrid Journal   (Followers: 26)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
Cryogenics     Hybrid Journal   (Followers: 62)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 117)
Diagnostic and Interventional Imaging     Full-text available via subscription  
Diamond and Related Materials     Hybrid Journal   (Followers: 10)
Discrete and Continuous Models and Applied Computational Science     Open Access  
Doklady Physics     Hybrid Journal   (Followers: 1)
e-Boletim da Física     Open Access  
East European Journal of Physics     Open Access   (Followers: 1)
Edufisika : Jurnal Pendidikan Fisika     Open Access  
EDUSAINS     Open Access  
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 26)
EJNMMI Physics     Open Access  
Emergent Scientist     Open Access  
Engineering Failure Analysis     Hybrid Journal   (Followers: 68)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 24)
Environmental Fluid Mechanics     Hybrid Journal   (Followers: 11)
EPJ Quantum Technology     Open Access   (Followers: 2)
EPJ Techniques and Instrumentation     Open Access  
EPJ Web of Conferences     Open Access   (Followers: 1)
EUREKA : Physics and Engineering     Open Access  
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 19)
European Physical Journal C     Hybrid Journal   (Followers: 2)
Europhysics News     Open Access  
Experimental and Computational Multiphase Flow     Hybrid Journal  
Experimental Mechanics     Hybrid Journal   (Followers: 21)
Experimental Techniques     Hybrid Journal   (Followers: 51)
Exploration Geophysics     Hybrid Journal   (Followers: 4)
Few-Body Systems     Hybrid Journal   (Followers: 2)
Fire and Materials     Hybrid Journal   (Followers: 5)
FirePhysChem     Open Access  
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 2)
Fluctuation and Noise Letters     Hybrid Journal  
Fluid Dynamics     Hybrid Journal   (Followers: 27)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Nanotechnology     Open Access   (Followers: 1)
Frontiers in Physics     Open Access   (Followers: 6)
Frontiers of Materials Science     Hybrid Journal   (Followers: 6)
Frontiers of Physics     Hybrid Journal   (Followers: 2)
Fusion Engineering and Design     Hybrid Journal   (Followers: 6)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 35)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 4)
Geophysical Research Letters     Full-text available via subscription   (Followers: 168)
Giant     Open Access   (Followers: 1)
Glass Physics and Chemistry     Hybrid Journal  
Granular Matter     Hybrid Journal  
Graphs and Combinatorics     Hybrid Journal   (Followers: 4)
Gravitation and Cosmology     Hybrid Journal   (Followers: 7)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 11)
High Energy Density Physics     Hybrid Journal   (Followers: 3)
High Pressure Research: An International Journal     Hybrid Journal   (Followers: 3)
Himalayan Physics     Open Access   (Followers: 6)
IEEE Embedded Systems Letters     Hybrid Journal   (Followers: 60)
IEEE Journal of Quantum Electronics     Hybrid Journal   (Followers: 19)
IEEE Journal on Multiscale and Multiphysics Computational Techniques     Hybrid Journal  
IEEE Magnetics Letters     Hybrid Journal   (Followers: 7)
IEEE Nanotechnology Magazine     Hybrid Journal   (Followers: 45)
IEEE Reviews in Biomedical Engineering     Hybrid Journal   (Followers: 19)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 98)
IEEE Solid-State Circuits Magazine     Hybrid Journal   (Followers: 11)
IEEE Transactions on Autonomous Mental Development     Hybrid Journal   (Followers: 8)
IEEE Transactions on Biomedical Engineering     Hybrid Journal   (Followers: 35)
IEEE Transactions on Broadcasting     Hybrid Journal   (Followers: 11)
IEEE Transactions on Geoscience and Remote Sensing     Hybrid Journal   (Followers: 178)
IEEE Transactions on Haptics     Hybrid Journal   (Followers: 4)
IEEE Transactions on Industrial Electronics     Hybrid Journal   (Followers: 85)
IEEE Transactions on Industry Applications     Hybrid Journal   (Followers: 57)
IEEE Transactions on Learning Technologies     Full-text available via subscription   (Followers: 12)
IEEE Transactions on Quantum Engineering     Open Access   (Followers: 3)
IEEE Transactions on Services Computing     Hybrid Journal   (Followers: 5)
IEEE Transactions on Software Engineering     Hybrid Journal   (Followers: 84)
IEEE Women in Engineering Magazine     Hybrid Journal   (Followers: 12)
IEEE/OSA Journal of Optical Communications and Networking     Hybrid Journal   (Followers: 19)
IET Optoelectronics     Open Access   (Followers: 3)
Il Colle di Galileo     Open Access  
Image Analysis & Stereology     Open Access   (Followers: 1)
Imaging Science Journal     Hybrid Journal   (Followers: 3)
ImmunoInformatics     Open Access   (Followers: 1)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 3)
Indian Journal of Physics     Hybrid Journal   (Followers: 18)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 36)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 49)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal   (Followers: 1)
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal   (Followers: 11)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 12)
Intermetallics     Hybrid Journal   (Followers: 21)
International Applied Mechanics     Hybrid Journal   (Followers: 5)
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 5)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 13)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 5)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 38)

        1 2 3 4 | Last

Similar Journals
Journal Cover
Indian Journal of Physics
Journal Prestige (SJR): 0.308
Citation Impact (citeScore): 1
Number of Followers: 18  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0973-1458 - ISSN (Online) 0974-9845
Published by Springer-Verlag Homepage  [2469 journals]
  • Twist measurement based on dual-wavelength ratio for helical long-period
           grating

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      Abstract: Abstract Twist measurement based on the transmission of fixed wavelength of a helical long-period fiber grating is studied. The single-mode fiber is spiraled by a welding machine. There are two resonance dips near 1473 nm and 1517 nm, with the pitch length around 782 μm. The experimental results show that the transmission near 1473 nm decreases along with contra-direction twist and increases along with co-direction twist. In contrast, the transmission near 1517 nm decreases along with co-direction twist and increases along with contra-direction twist. The relationships between the twist and the resonance wavelength, the twist and the transmission of resonance dips, the twist and the transmission of fixed wavelengths are studied, respectively. They all show linear relationship with the twist, and the slopes are about 100 nm·mm/rad, 36 dB·mm/rad, and 46 dB·mm/rad, respectively. The dual-wavelength ratio is studied, and the ratio also shows linear relationship with the twist. The twist sensitivity of I1463.3 nm/I1526.5 nm is about 0.79 each 0.01 rad/mm. This has great potential application in twist sensors.
      PubDate: 2022-07-01
       
  • Propagation of cosh-Gaussian beams in uniaxial crystals orthogonal to the
           optical axis

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      Abstract: Abstract This article presents propagation of cosh-Gaussian beam in uniaxial crystal orthogonal to optical axis. Huygens-Fresnel integral is evaluated in order to find received field. Our results show that beam size increases when refractive index ratio of crystal gets low. On the other hand, intensity distribution becomes off-axis with the change in first cosh argument. Beam evolves into vanishing cosine like distribution lying on y-axis if second cosh argument increases. Although, higher intensities can be seen at close distance for cosh-Gaussian beam with higher arguments, this intensity quickly brings down at longer distances. In light of these, we expect that these results will be used in beam shaping and optical tracking applications.
      PubDate: 2022-07-01
       
  • Size-dependent melting phenomena in silver metal nanoclusters using
           molecular dynamics simulations

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      Abstract: Abstract Metallic nanoclusters have attracted significant amount of attention because of their unique physical, catalytic, thermal and electronic properties as well as their tremendous potential for technological applications. In this study, we have investigated melting phenomena of silver metal nanoclusters (AgN) with N = 108 up to 4000 atoms using molecular dynamics simulations with the modified embedded atomic method potential parameters. The variation of the internal energies, mean square displacements, diffusion coefficients, radial distribution functions and specific heats of the nanoclusters are examined as a function of temperature. Characterization of the physical state and determination of melting profile for each nanocluster has been achieved. It is observed that the melting point temperatures of the nanoclusters decreased dramatically with the decrease in cluster size. This size dependency observation of the melting point temperature is consistent with the existing experimental as well as theoretical studies on metal nanoclusters. This study demonstrates the two-state model of phase transition. To validate the potential used, the melting point temperature of bulk silver has also been calculated using the same potential parameters and the result is fairly close to the actual value.
      PubDate: 2022-07-01
       
  • Structural, mechanical, dielectric, thermal, and nonlinear optical
           properties of zinc-doped ninhydrin single crystals

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      Abstract: Abstract In this study, slow evaporation method was used to develop various 0.4 (Z4N), 0.6 (Z6N), and 0.8 (Z8N) mole% of zinc nitrate-doped ninhydrin single crystals. The structural, mechanical, dielectric, thermal, and nonlinear optical properties of Z4N, Z6N, and Z8N single crystals were investigated. The crystal structures of the pure ninhydrin and the zinc-doped Z4N, Z6N, and Z8N single crystals were monoclinic with the P21 space group. The coefficients of work-hardening values were 4.85 (Z4N), 4.83 (Z6N), and 4.59 (Z8N). The decomposition temperatures of grown single crystal were approximately 261.04 °C. It was noted from photoluminescence studies that the emission intensity of the peaks slightly increased with the increase in zinc content. The dielectric behaviors of the prepared crystals were studied, and activation energy of the AC conduction was found to be 0.05–0.1 eV. The coefficient of second harmonic generation was ~ 1.3 times greater than that of potassium dihydrogen orthophosphate crystal.
      PubDate: 2022-07-01
       
  • Study of contribution of doubly excited 3d10 configurations in excitation
           energies and SXR transition data of Fe-like ions

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      Abstract: Abstract We present calculations of excitation energies, emitted photon wavelengths during the transition from upper level to lower level, transitions rates and other transition parameters for lowest 200 fine structure levels of Fe-like Xe, Cs and Ba ions by using multi-configuration Dirac–Fock (MCDF) technique. The significant contribution of the relativistic and quantum electrodynamic effects (QED) in addition to Breit corrections in energies of levels is observed and reported in this work. The calculated energies from both flexible atomic code (FAC) and General Purpose Atomic Structure Package (GRASP) are compared with the critically evaluated experimental NIST and other recent reported experimental and theoretical results. The computed data validate the experimentally available data. We have estimated the wavelengths of all soft X-ray (SXR) from the ground state in Fe-like isoelectronic sequence. Furthermore, sufficient new radiative data of Fe-like ions, which have not been published up to our knowledge, have been reported in present paper. Due to high abundance of iron (Z = 26) in cosmic environments, the present study can be beneficial in the field of modeling of fusion and astrophysical plasmas devices such as tokamaks, laser spectroscopy, electron beam ion trap (EBIT) cell biology and microscopic imaging.
      PubDate: 2022-07-01
       
  • Holographic dark energy cosmology with a new coupling function

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      Abstract: Abstract An interacting holographic dark energy model is investigated by using the recent observations of supernovae, cosmic microwave background radiation, baryonic acoustic oscillations and observed Hubble parameters. In this work, we exchanged the coupling parameter ξ from constant into a varying function of redshift following the parameterization introduced by Chevallier, Polarski and Linder. The best-fit values of the various parameters determined through chi-square function minimization technique show that non-zero values of the coupling parameter are possible, and the equation of state parameter for dark energy less than -1 is also possible. Then, our model explains properly the transition of deceleration phase of the universe to the acceleration. Besides, our model seems to resolve the cosmic coincidence problem.
      PubDate: 2022-07-01
       
  • Ionic conductivities and dielectric analysis of (C6H20N3)BiI6·H2O
           compound

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      Abstract: Abstract Thermogravimetric analysis, differential scanning calorimetry analysis and complex impedance spectroscopic data have been carried out on (C6H20N3)BiI6.H2O compound. The results show that this compound exhibits a phase transition at 325 K which was characterized by differential scanning calorimetry spectroscopy and dielectric measurements. The dielectric analysis has been studied by using impedance spectroscopy measurements over a wide range of temperatures and frequencies, 290–350 K and 100 Hz–1 MHz, respectively. The Z′ and Z″ vs. frequency plots are well-fitted to an equivalent electrical circuit consisting of a parallel combination of a bulk resistance Rp (polarization resistance) and constant phase elements CPE (capacity of the fractal interface). The frequency-dependent AC conductivity is well analyzed by Jonscher’s universal power law: σ(ω,T) = σdc(T) + A(T)ωs(T). This suggested hoping conduction due to three theoretical models. The latter can be attributed to the quantum mechanical tunneling model in region I and correlated barrier hopping in region II. The temperature dependence and dielectric relaxation of the DC conductivity satisfied the Arrhenius law. Furthermore, the modulus plots have been characterized by full width at half height or in terms of a non-experiential decay function φ(t) = exp(− t/τ)β. The values of the activation energies obtained from the electrical conductivity and electric modulus are near, which suggests that the transport is probably due to the ion hopping mechanisms.
      PubDate: 2022-07-01
       
  • Prediction of intensity of moderate and intense geomagnetic storms using
           artificial neural network during two complete solar cycles 23 and 24

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      Abstract: Abstract This work aims to predict moderate, intense, and super geomagnetic storms during the two recent solar cycles 23 and 24 encompassing the period 1996–2018 using an artificial neural network (ANN). Optimization of the neural network includes a choice of activation function, training function, learning function, hidden layers, hidden neurons, learning rate, and momentum constant. The results obtained by the present study show the ability of the ANN model to produce an accurate estimate of the probability appearance of moderate and intense storms of about 88.9%.
      PubDate: 2022-07-01
       
  • Mechanical stability, half-metallic, and thermoelectric properties of
           LuCoTiSi, LuCoTiGe and LuCoTiSn: a DFT study

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      Abstract: Abstract The quaternary Heusler LuCoTiSi, LuCoTiGe, and LuCoTiSn compounds' physical properties have been investigated using the GGA approximation based on the density functional theory. These compounds are stable in the ferromagnetic phase and semi-stable in the non-magnetic phase. Elastic studies show that these compounds are quite stable and belong to the category of ductile materials. Phonon calculations also show that these two combinations are quite stable, and the phonon levels in the band structure are all in the positive region. The LuCoTiSi, LuCoTiGe, and LuCoTiSn compounds are half-metallic with 100% spin polarization with 2.0µB 3.0 µB, and 2.0µB, respectively. The maximum value of their Seebeck (S) coefficient occurred at 130 K. The figure of merit (ZT) coefficient of these compounds at 100 K equals one and decreased to room temperature with a gentle slope, indicating their thermoelectric efficiency at low and room temperatures. All compounds have accessible regions that referred to their thermodynamic stability. The LuCoTiGe case has a more extensive accessible region than other cases of the thermodynamic phase diagram.
      PubDate: 2022-07-01
       
  • A new method for determining the bandgap in semiconductors in presence of
           external action taking into account lattice vibrations

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      Abstract: Abstract This article proposes a new method of calculating conductivity in semiconductors, taking into account lattice oscillations and thermal smears under the influence of temperature and magnetic fields. It is shown that the dependence of the effective electron mass on energy and temperature affects the temperature dependence of the bandgap in a strong magnetic field. With the help of numerical experiments and using experimental results, graphs of the temperature dependence of the bandgap in the absence and the presence of a magnetic field were obtained. The theoretical results are compared with experimental results. It is shown that to explain the dependence of the bandgap, it is necessary to take into account the contribution of thermal broadening of energy levels. It was found that the total change in the bandgap is determined by both the interaction of electrons with lattice vibrations and the thermal broadening of energy levels in the allowed bands.
      PubDate: 2022-07-01
       
  • Noether symmetry and its inverse for dynamical systems with two kinds of
           nonstandard Lagrangians via quasi-coordinates

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      Abstract: Abstract In this paper, the Noether symmetries and their inverse theorems for dynamical systems with two kinds of nonstandard Lagrangians via quasi-coordinates, namely exponential and power-law Lagrangians, are presented and discussed. For each case, the corresponding Hamilton principle for the nonstandard Lagrangian dynamical systems via quasi-coordinates is given, and the differential equations of motion are established. Based upon the invariance of the Hamilton action for the nonstandard Lagrangian dynamical systems via quasi-coordinates under the group of infinitesimal transformations, the definitions and criteria of the Noether symmetric and quasi-symmetric transformations are given and derived. The Noether theorem and its inverse theorem via quasi-coordinates are established, which reveal the relationship between the Noether symmetry and conserved quantity for the exponential and power-law Lagrangian dynamical systems via quasi-coordinates. Three examples are given to illustrate the applications of the results.
      PubDate: 2022-07-01
       
  • L-citrulline (LC) doped zinc tris-thiourea sulfate (ZTS) single crystals
           for photonic applications

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      Abstract: Abstract The slow evaporation solution technique (SEST) is one of the best methods to grow the crystals. Hence, pure and L-citrulline (LC) doped (1 mol%, 3 mol% and 5 mol%) zinc tris-thiourea sulfate (ZTS) crystals were grown by the SEST method at room temperature and investigated the influence of dopant on optical, thermal, mechanical and electrical properties of ZTS crystal. The peak shift in the PXRD spectrum, slight changes in the structural parameters affirmed by SXRD infers the incorporation of dopant into the ZTS. No appreciable differences in the FTIR spectra for pure and LC doped ZTS crystals were observed as well as no secondary vibrational bands were observed for the doped crystal imply the presence of a small amount of LC as an additive in the ZTS material. The optical study demonstrated that the transmittance window of ZTS remains the same, but the energy gap is increased upon induction of LC dopant. Further, the addition of LC enhanced the hardness number, whereas the thermal stability decreased slightly. The nature of dielectric constant, dielectric loss and AC conductivity of the grown crystals was studied as a function of frequency; significant improvements in the parameters were observed for the doped crystals. The second-harmonic efficiency of ZTS was also improved with a dopant.
      PubDate: 2022-07-01
       
  • The network structure and self-diffusion in Al2O3 and Al2O3·2SiO2 system:
           insight from data mining of molecular dynamics data

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      Abstract: Abstract Molecular dynamics (MD) simulation of Al2O3 and Al2O3·2SiO2 at amorphous and liquid states was applied to investigate structural characteristics. The results showed that the first peak of Al-Al pair radial distribution function (PRDF) in Al2O3.2SiO2 (AS2) splits into two peaks at r1 = 2.74 Å (pre-peak) and r2 = 3.16 Å (main peak). This does not appear in AS2 at liquid state as well as in Al2O3 at both states. The origin of the first peak splitting that relates to the existence of number of edge-sharing (ES) bonds is explained in this work. We found that most of the Al and Si atoms are four-coordinated by oxygen atoms in Al2O3 and AS2 at both states to form SiO4 and AlO4 tetrahedra units. Structure of AS2 also exists a significant fraction of AlO3 units and a small one of AlO5 units. Meanwhile, there are a significant fraction of AlO5 units and a small one of AlO3 units in structure of Al2O3. The links between two adjacent SiOx units and between AlOx and SiOx units (x = 3–5) in AS2 at 600 K and 3500 K are mainly corner-sharing (CS) and edge-sharing (ES) bonds. The AlOx units link to each other by CS bonds in Al2O3; meanwhile, the ones link to each other by both CS and ES bonds in AS2. The diffusivity in AS2 liquid is much slower than the one in Al2O3 liquid. The self-diffusion coefficient of individual atomic species is also calculated and discussed in detail.
      PubDate: 2022-07-01
       
  • Stochastic multiresonance in a time-delayed insect outbreak model under
           

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      Abstract: Abstract In this paper, the stochastic resonance phenomenon in a time-delayed insect outbreak system driven by cross-correlated Gaussian white noises and multiplicative periodic signals is investigated. The signal-to-noise ratio (SNR) expression of the time-delayed insect outbreak system is acquired in accordance with the small delay approximation theory, the Novikov theorem and the steepest descent method. The results of numerical simulation on the SNR function of the system indicate that the stochastic multiresonance phenomenon appears on the corresponding SNR curve with the increases of the multiplicative noise intensity. However, a conventional stochastic resonance phenomenon is observed on the SNR curve under the influence of additive noise intensity, and resonance and suppression coexist, which indicates that multiplicative noise and additive noise have significantly different impacts on stochastic resonance as the SNR changes with different intensity of noise correlation. When the multiplicative noise intensity takes its value from different ranges, the effect of time delay on SNR differs entirely. When the intensity of noise correlaton is negative and positive, the noise correlation strength has completely opposite influences on the SNR curves.
      PubDate: 2022-07-01
       
  • Anomalous magnetic behaviour at nano-scale of Mn2+-substituted
           magnesio-ferrite synthesized by auto-combustion technique

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      Abstract: Abstract The nano-crystalline mixed ferrites with the generic formula MnxMg1 − xFe2O4 (x = 0.0–1.0, step: 0.2) were prepared by the citrate-gel auto-combustion technique. Motivated by anomalous magnetic behaviour of coarse-grained MnFe2O4, the main aim was to study the influence of Mn2+ substitution in MgFe2O4 on magnetic structure at nano-regime. The compositional stoichiometry of the final ferrite products was ascertained by EDAX mapping and particle size for each sample was determined by powder X-ray diffraction, TEM, small-angle X-ray and neutron scattering techniques. The lattice constant increases with Mn-content due to larger cation (Mn2+) substitution. The distribution of cations in the tetrahedral (A) and octahedral (B) interstitial sites of the spinel lattice is determined by X-ray diffraction and Mossbauer spectral intensity analysis. The Mossbauer spectra at room temperature exhibit two sextets due to A- and B-sites for compositions x = 0.0, 0.2 and 1.0 while spectra showed central paramagnetic doublet superimposed on magnetic sextets for the samples with x = 0.4, 0.6 and 0.8, ascribed to the presence of superparamagnetic clusters. Thermal variation of AC susceptibility showed hump near the Curie temperature due to the presence of superparamagnetic clusters as corroborated by Mossbauer signature. The observed saturation magnetic moment (at temperature 5 K and applied field 9 T) is found lower compared to Neel's moment for the compositions with x > 0.2 which is explained on the basis of the exchange disorder of Fe3+ ions in the B-sites in Mn-containing ferrites.
      PubDate: 2022-07-01
       
  • A first-principles study of the effect of doping and vacancy defects on
           the magnetic properties of ZnSnAs2:V

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      Abstract: Abstract Ab initio study of the electronic and magnetic properties of vanadium-doped and vacancy-defected chalcopyrite semiconductor ZnSnAs2 was carried out using density functional theory within the spin generalized gradient approximation with Hubbard-like correction (SGGA + U). Investigation of magnetic properties shows that adding a transition element contributes to the magnetization of ZnSnAs2. The total energy calculations for a number of supercells show that a ferromagnetic spin ordering is favorable when V replaces Zn. The ferromagnetic alignment in V-doped ZnSnAs2 systems behaves half-metallic state. The presence of a single Zn- or Sn- or As-vacancy affects the ferromagnetism and may even strengthen the magnetization of V-doped ZnSnAs2.
      PubDate: 2022-07-01
       
  • Alpha decay half-lives of actinides using different proximity potentials

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      Abstract: Abstract We have studied the alpha decay properties of actinides using seven different proximity potentials MP 77, MP 81, Bass 77, Prox 13, Ng80, DP00 and Prox 00. The values produced by the present work are compared with experiments. Decay chains of actinides are presented. The present work is useful in the study of decay modes of actinides.
      PubDate: 2022-07-01
       
  • Logarithmic wave-mechanical effects in polycrystalline metals: theory and
           experiment

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      Abstract: Abstract Schrödinger-type wave equations with logarithmic nonlinearity occur in hydrodynamic models of Korteweg-type materials with capillarity and surface tension, which can undergo liquid–solid or liquid–gas phase transitions. One of the predictions of the theory is a periodic pattern of density inhomogeneities occurring in the form of either bubbles (topological phase), or cells (non-topological phase). Such inhomogeneities are described by solitonic solutions of a logarithmic wave equation, gaussons and kinks, in the vicinity of the liquid–solid phase transition. During the solidification process, these inhomogeneities become centers of nucleation, thus shaping the polycrystalline structure of the metal grains. The theory predicts a Gaussian profile of material density inside such a cell, which should manifest in a Gaussian-like profile of microhardness inside a grain. We report experimental evidence of large-scale periodicity in the structure of grains in the ferrite steel S235/A570, copper C-Cu/C14200, austenite in steel X10CrNiTi18-10/AISI 321, and aluminum–magnesium alloy 5083/5056; and also Gaussian-like profiles of microhardness inside an averaged grain in these materials.
      PubDate: 2022-07-01
       
  • Effect of magnetic field on the viscous behaviour of iron particles
           suspended silicone additive based magnetorheological fluids

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      Abstract: Abstract The focal point of these research insights, the study and analysis of the dynamic behaviour of magnetorheological fluid with various composition ratios. The secondary objective of the research aims to reduce the sedimentation behaviour of the fluid. Magnetorheological Fluid (MRF) acts as fluid in absence of the magnetic field and its viscosity increases impressively with the influence of the magnetic field. In this research work, Silicon-based lubricant and carrier fluid with soft magnetic materials are utilized to fabricate the MR Fluid. Rheological properties, dynamic module studies and sedimentation ratio are subsequently studied for the synthesized fluid, to know about its behaviour and properties. Interpreted data show significant stability and efficiency of fluid reasoning the optimization in the ratio of the materials composition and incorporation of additives.
      PubDate: 2022-07-01
       
  • Reflection of waves at an initially stressed surface of a rotating
           thermodiffusive half space with fiber reinforcement

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      Abstract: Abstract The study is concerned with the reflection phenomenon in a rotating fiber-reinforced thermodiffusive half space with initial stress under the purview of Green-Lindsay theory of generalized thermoelasticity. Four basic waves namely qP (quasi-P), qMD (quasi-mass diffusion), qT (quasi-thermal) and qSV (quasi-SV) that travel with distinct speeds are found to be coupled due to the presence of reinforcement and rotation. With the application of boundary conditions, reflection coefficients and energy ratios for these reflected waves are presented in the closed form. With the help of MATLAB programming, different characteristics of waves like the phase velocity, reflection coefficient and energy ratio are computed numerically and plotted graphically against angle of incidence to evince the significance of rotation, initial stress, relaxation times, diffusion and reinforcement. The law of conservation of energy at the surface is also verified. Finally, it is shown that under certain conditions, previous results in the literature are special cases of our results. The study finds applications in composite engineering, geology, seismology, control system and acoustics, exploration of valuable materials beneath the earth’s surface.
      PubDate: 2022-07-01
       
 
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