Subjects -> PHYSICS (Total: 857 journals)
    - ELECTRICITY AND MAGNETISM (10 journals)
    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (53 journals)
    - OPTICS (92 journals)
    - PHYSICS (625 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (30 journals)

PHYSICS (625 journals)            First | 1 2 3 4     

Showing 601 - 741 of 741 Journals sorted alphabetically
Tectonics     Full-text available via subscription   (Followers: 15)
The European Physical Journal H     Hybrid Journal   (Followers: 2)
The European Physical Journal Plus     Open Access   (Followers: 1)
The Physics Teacher     Full-text available via subscription   (Followers: 360)
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 22)
Theoretical and Mathematical Physics     Hybrid Journal   (Followers: 8)
Thermal Science and Engineering Progress     Open Access   (Followers: 6)
Transport Phenomena in Nano and Micro Scales     Open Access  
Tribologie und Schmierungstechnik     Full-text available via subscription  
Tribology International     Hybrid Journal   (Followers: 47)
Tribology Letters     Hybrid Journal   (Followers: 9)
Turkish Journal of Physics     Open Access  
Ultrasonics     Hybrid Journal   (Followers: 9)
Ultrasonics Sonochemistry     Hybrid Journal   (Followers: 2)
Ultrasound in Medicine & Biology     Hybrid Journal   (Followers: 10)
Universal Journal of Physics and Application     Open Access  
Unnes Physics Education Journal     Open Access   (Followers: 1)
Vibration     Open Access   (Followers: 30)
Virtual Journal of Quantum Information     Hybrid Journal   (Followers: 3)
Water Waves     Hybrid Journal  
Western Journal of Communication     Hybrid Journal   (Followers: 5)
Women & Performance: a journal of feminist theory     Hybrid Journal   (Followers: 15)
World Journal of Condensed Matter Physics     Open Access   (Followers: 2)
Zeitschrift für angewandte Mathematik und Physik     Hybrid Journal   (Followers: 2)
Фізика і хімія твердого тіла     Open Access  

  First | 1 2 3 4     

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The European Physical Journal Plus
Journal Prestige (SJR): 0.49
Citation Impact (citeScore): 2
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2190-5444
Published by Springer-Verlag Homepage  [2468 journals]
  • Group delayed phase switching of Gaussian light pulses via a thermal
           atomic medium

    • Abstract: Abstract We show group delayed phase switching of a Gaussian pulse transmitting through a thermal four-level atomic medium using relative phase of the cyclically driven one microwave and two optical fields. The present scheme explains that in the presence of the atom’s dephasing reservoir, a plane-polarized probe light through the medium exhibits double electromagnetically induced transparency (EIT). Upon tuning the relative phase of the coupling fields, the double EIT converts into two asymmetric mirror inversion-like single EIT phenomenon. In parallel, we develop an input–output theory for probing Gaussian pulse through the thermal medium with a nonlinear dispersion to generate group delay (advancement) and switching of the group delay (advancement) using the relative phase of the driving fields. For collinear driving fields, the transmission of the pulses through the medium appears irrespective of the wave-vector mismatch and Doppler broadening effect. Consequently, the group delay and the group delay phase switching perform without measurable pulse distortion.
      PubDate: 2024-02-26
       
  • Scattering of impure mode and self-trapping phenomenon in a 1D quantum
           diatomic Klein–Gordon chain containing a mass defect

    • Abstract: Abstract We analyze the impurity effects on the existence of localized structures, modulational instability (MI) and energy localization in a 1D quantum diatomic Klein–Gordon chain containing a mass defect. We have found that the impurities significantly affect the vibrational properties of crystals by modifying the distribution of normal mode frequencies. The MI investigation shows that, on the one hand, the mass defect around its critical value can dramatically influence the instability areas and the growth rate; on the other hand, the system exhibits an intrinsic asymmetry property that influences the localization and propagation of the impure mode. The conditions of stability of the impure mode are presented and a scattering phenomenon is observed when the impure mode is unstable. This phonons scattering phenomenon can be controlled either by the mass impurity \(\Delta m_1\) , by the coupling term c and by the pure mass \(m_2\) . The accuracy of the analytical analysis has been performed by the numerical simulations and an excellent agreement has been observed. Furthermore, we have found through the energy localization that the impure mode can develop a local accumulation of energy known as self-trapping phenomenon.
      PubDate: 2024-02-26
       
  • Review of NORM occurrence and application of a tailored graded approach
           for the radiation protection in geothermal plants

    • Abstract: Abstract In the present paper, the general methodological approach developed to manage legislative requirements for NORM involving industries was fitted to the geothermal industrial sector, which is in the indicative list of the European Directive 2013/59/Euratom (EU-BSS). A review of the state of the art about the radiological characterization of NORM in geothermal plants have been performed with the aim to identify matrices and exposure scenarios of radiological concern. From the analysis of collected data, it results that radiological content of NORM residues generally depends on the characteristics of the geothermal fluid as well as on the type of the plants. In several plants, residues (both scales and filtering materials) show generally high activity concentrations, especially for Ra-226 and Ra-228 decay segments, exceeding Exemption Levels of the EU-BSS. Several tables have been presented as tools to support the stakeholders in the application of the legislative requirements regarding radiation protection in the geothermal sector.
      PubDate: 2024-02-26
       
  • Spatiotemporal patterns of the network composed of modified Chua’s
           circuits with distributed coupling

    • Abstract: Abstract To further investigate the formation mechanism of spatiotemporal patterns, a network which is composed of modified Chua’s circuits is constructed. The dynamics of the modified Chua’s circuit with appropriate parameters are presented via numerical computation and circuit simulation. The spatiotemporal patterns of the regular network and the network with distributed coupling are studied, respectively. Spiral wave can be induced in the network on the condition of initial values. The spread speed of the spiral wave in the regions with larger coupling intensity is faster than those regions with smaller coupling intensity, which could result in spiral waves in different regions having different shapes. Various interesting spatiotemporal patterns can be formed in the network under the influence of distributed coupling and initial conditions. In addition, the spatiotemporal patterns in the network with distributed coupling under external periodic excitation and noise perturbation are studied, respectively.
      PubDate: 2024-02-26
       
  • Doughnut effect with relativistic electrons and a Si crystal

    • Abstract: We present here the results of an experimental and theoretical study of the transmission of relativistic electrons through the  < \(100\) > axial channels of a Si crystal. The electron kinetic energy is 255 MeV and the crystal thickness 470 nm. The measurements were done for different tilt angles of the channel axis relative to the velocity vector of the incident electron beam. The calculations have been performed using the theory of crystal rainbows. The interaction of an incident electron and a crystal’s atom has been described by Molière’s approximation of the Thomas–Fermi interaction potential. We have used the continuum approximation, included the thermal vibrations of the crystal’s atoms, and disregarded the energy loss and the dispersion of the channeling angle of the electrons, caused by their collisions with the crystal’s atoms. The angular distributions of transmitted electrons have been generated by solving the electron equations of motion and using a computer simulation method. They have been analyzed via the corresponding rainbow patterns. The comparison of the obtained experimental and theoretical results for two values of the tilt angle has demonstrated that the doughnut effect in axial electron channeling is the rainbow effect with a tilted crystal. Graphic abstract
      PubDate: 2024-02-26
       
  • $$e^{+}e^{-}\rightarrow l^{+}l^{-}$$ scattering at finite temperature in
           the presence of a classical background magnetic field

    • Abstract: Abstract In this work the \(e^{+}e^{-}\rightarrow l^{+}l^{-}\) scattering process is investigated. The cross-section is calculated considering three different effects: temperature, external magnetic field and chemical potential. The effect due to an external field is inserted into the problem through a redefinition of the fermionic field operator. Effects due to temperature and chemical potential are introduced using the Thermo Field Dynamics formalism.
      PubDate: 2024-02-25
       
  • Spatiotemporal patterns in a network of locally and magnetically coupled
           VDPCL oscillators

    • Abstract: Abstract Recent advancements in wireless magnetic induction technology have enabled applications in both wireless power and data transfer. This study investigates the spatiotemporal dynamics of a network of \({\varvec{N}}\ge 10\) magnetically coupled VDPCL oscillator (Van der Pol oscillator coupled to linear circuit). The focus is on exploring these dynamics based on magnetic coupling coefficients. Using statistical measures namely the strength of incoherence, the cross-correlation coefficient, and a classification algorithm described in the text, synchronized states within the network are categorized. Numerical simulations reveal diverse dynamics, including coherence, incoherence, chimera states, solitary states, and multicluster behaviors, influenced by initial conditions and magnetic coefficients. Also, specific dynamics such as solitary at the cluster state, clustered solitary state and water-like traveling cluster waves are obtained. These phenomena contribute to a richer understanding of the complex dynamics emerging in magnetically coupled oscillator networks. To validate our findings, PSPICE-based circuit simulations are performed for \({\varvec{N}}=10\) oscillators aligning well with the predictions of mathematical models. This study not only sheds light on the diverse dynamics achievable in magnetically coupled oscillator networks but also holds implications for advancing wireless technologies. The systematic classification and validation through PSPICE simulations contribute to the robustness of our findings and their applicability in practical scenarios.
      PubDate: 2024-02-25
       
  • Machine learning the deuteron: new architectures and uncertainty
           quantification

    • Abstract: Abstract We solve the ground state of the deuteron using a variational neural network ansatz for the wavefunction in momentum space. This ansatz provides a flexible representation of both the S and the D states, with relative errors in the energy which are within fractions of a per cent of a full diagonalisation benchmark. We extend the previous work on this area in two directions. First, we study new architectures by adding more layers to the network and by exploring different connections between the states. Second, we provide a better estimate of the numerical uncertainty by taking into account the final oscillations at the end of the minimisation process. Overall, we find that the best performing architecture is the simple one-layer, state-connected network. Two-layer networks show indications of overfitting, in regions that are not probed by the fixed momentum basis where calculations are performed. In all cases, the errors associated to the model oscillations around the real minimum are larger than the stochastic initilization uncertainties.
      PubDate: 2024-02-25
       
  • Reproducing countless hidden attractors in a memristive system based on
           offset boosting

    • Abstract: Abstract Offset control has attracted great research in recent years, and the introduction of special offset functions can produce homogenous multistability; however, the uncountably many attractors caused by offset boosting have not been focused. In this work, a 4D memristive chaotic model with uncountably many hidden attractors is designed. More interestingly, two-dimensional offset boosting can be achieved by a constant that simply switches the two variables of the offset by combining different initial values with the offset parameter. The offset parameters of variables are hidden when offset parameters cancel each other out; variable boosting can also be achieved only by varying initial conditions, which present a special regime of homogenous multistability with uncountably many continuously distributed attractors. This system provides the first example with uncountably many hidden attractors without any periodic function involved. Finally, the proposed memristive circuit with chaotic behavior is implemented through printed circuit board; circuit implementation agrees well with the numerical explorations and theoretical analysis.
      PubDate: 2024-02-24
       
  • Various amplitude chimeras in locally coupled limit-cycle oscillators:
           impact of coupled system size

    • Abstract: Abstract We investigate chimera states in two networks of locally coupled identical paradigmatic limit-cycle oscillators, which are the van der Pol oscillator and the Rayleigh oscillator. The interplay between local dynamics, local coupling, size of the system, and specially prepared initial conditions allows the two ring-networks to generate a lot of amplitude chimera states; a basic amplitude chimera state being a self-organized state made up of spatially separated domains of synchronous oscillations with a large amplitude and asynchronous oscillations with disparate smaller amplitudes and drifting centers of mass. Apart from this classical amplitude chimera state, we report the occurrence of damped amplitude chimera and stable amplitude chimera states that were found previously, and two novel stable amplitude chimera states, namely, traveling amplitude chimera and snaking amplitude chimera states. The traveling amplitude chimera state, that emerges in coupled systems with relatively large size, involves a strongly localized incoherent region that moves slowly and uniformly along the ring-network. As for the snaking amplitude chimera state, that seldom occurs, its incoherent region(s) snakes (snake, respectively) regularly around a fixed position (fixed positions, respectively). Furthermore, while examining the features of the chimera states with respect to the size of the coupled systems, we find that the lifetime of transient amplitude chimera patterns increases with the size of the coupled system. A result that is contrary to previous findings.
      PubDate: 2024-02-24
       
  • Reheating constraints on modified quadratic chaotic inflation

    • Abstract: Abstract The reheating era of inflationary universe can be parameterized by various parameters like reheating temperature \(T_{\text {re}}\) , reheating duration \(N_{\text {re}}\) and average equation of state parameter \({\overline{\omega }}_{\text {re}}\) , which can be constrained by observationally feasible values of scalar power spectral amplitude \(A_{\text {s}}\) and spectral index \(n_{\text {s}}\) . In this work, by considering the quadratic chaotic inflationary potential with logarithmic correction in mass, we examine the reheating era in order to place some limits on model’s parameter space. By investigating the reheating epoch using Planck 2018+BK18+BAO data, we show that even a small correction can make the quadratic chaotic model consistent with latest cosmological observations. We also find that the study of reheating era helps to put much tighter constraints on model and effectively improves accuracy of model.
      PubDate: 2024-02-24
       
  • Background studies for the HOLMES experiment

    • Abstract: Abstract Determining the mass of neutrinos is one of the most compelling topics in particle physics. HOLMES, an experiment for a direct measurement of the neutrino mass, is addressing this subject through a calorimetric approach, exploiting arrays of Low-Temperature Transition-Edge Sensor Detectors (TESs) loaded with \(^{163}\) Ho. The experiment has entered its first phase in 2023, implanting approximately 1 Bq per pixel in an array of 64 detectors. In this work, I present the measurement made before this stage, in order to determine the expected background arising from natural radioactivity and cosmic rays. The significance of this background depends on the activity per pixel, which has yet to be defined based on the result of the first phase.
      PubDate: 2024-02-24
       
  • Synthesis and characterization of NaYF4:Pr3+@NaYF4:Eu3+ core@shell
           nanoparticles as down-conversion material for organic solar cells
           application

    • Abstract: Here, a transparent luminescent down-conversion material (DCM) of NaYF4:Pr3+@NaYF4:Eu3+ core@shell nanoparticles has been used for OSCs application. The core@shell nanoparticles were prepared via a chemical sol–gel process. In OSCs, the prepared DCM is coated at backside of indium-doped tin oxide glass substrate, and the final device is called optimized device; whereas, the uncoated device is defined as control device. The power conversion efficiency of optimized device improved from 7.95 to 8.45%, as a result of the DCM re-emitting ultraviolet light in the visible range. Most importantly, the control device had inadequate stability under UV-B light, and within 90 min, efficiency has decreased by 38%. However, optimized device shows significantly superior performance by maintaining 84% of its initial PCE even after 90 min. It has been suggested that the NaYF4:Pr3+@NaYF4:Eu3+ DCM minimizes the ultraviolet deterioration while also improving the PCE of OSCs. Graphical abstract
      PubDate: 2024-02-23
       
  • Exploring the rich solution landscape of the generalized Kawahara
           equation: insights from analytical techniques

    • Abstract: Abstract The primary objective of this investigation revolves around scrutinizing the generalized Kawahara equation, a consequential nonlinear evolution equation prevalent in diverse physical domains such as shallow water waves, ion-acoustic waves within plasmas, and nonlinear acoustics. This equation manifests intricate dynamical attributes, notably featuring the emergence of solitary waves, shock waves, and chaotic solutions. In our pursuit to elucidate the nuanced behavior inherent in the generalized Kawahara equation, we deploy two robust analytical methodologies: the Khater II method and the variational iteration method. These methodologies offer adept and precise avenues for approximating solutions to nonlinear partial differential equations. Through our analytical scrutiny, a diverse spectrum of solutions comes to light, encompassing solitary wave solutions, periodic solutions, and chaotic solutions. Our exploration delves into the impact wielded by diverse parameters on solution behaviors, thereby furnishing invaluable insights into the foundational physical mechanisms at play. The findings derived from our inquiry contribute significantly to comprehending the intricate dynamics of the generalized Kawahara equation, concurrently establishing connections with other nonlinear evolution equations. This study augments the existing reservoir of knowledge concerning nonlinear wave phenomena and sets the stage for further investigations into the convoluted behaviors exhibited by these intricate systems.
      PubDate: 2024-02-23
       
  • Nearly vacuum static equations on K-contact manifolds and its applications
           in spacetimes

    • Abstract: Abstract In the present paper, we study nearly vacuum static equations on K-contact manifolds. Also, we investigate nearly vacuum static equations on \(\eta \) -Einstein K-contact manifolds and construct an example to verify the deduced results. Moreover, we apply nearly vacuum static equations on super quasi-Einstein spacetimes.
      PubDate: 2024-02-23
       
  • The intricate path of energy conservation in quantum mechanics: exploring
           coherent population return and laser–matter interaction

    • Abstract: Abstract This manuscript explores how a seemingly straightforward inquiry, emerging from the widely accepted semiclassical description of laser–matter interaction, concretely from a well-known adiabatic technique as coherent population return (CPR), can pose a challenge to our comprehension of a fundamental principle in Physics such as energy conservation. Throughout our investigation to resolve this apparent paradox, we have delved into fundamental concepts, thereby deepening our understanding of the aspects inherent to the formalism of Quantum Mechanics. We emphasize that the significance of attaining a conclusive answer extends beyond the answer itself, encompassing the illuminating journey undertaken to reach it. Consequently, our work holds educational value as it aims to foster a deeper understanding of the phenomenon by elucidating the process employed. This approach not only aids students in grasping the subject matter but also enhances our own understanding of laser–matter interaction and the counterintuitive phenomena that continuously defied our understanding of Quantum Mechanics.
      PubDate: 2024-02-21
       
  • Comment on “photons can tell ‘contradictory’ answer about where they
           have been”

    • Abstract: Abstract Yuan and Feng (Eur. Phys. J. Plus 138:70, 2023) recently proposed a modification of the nested Mach–Zehnder interferometer experiment performed by Danan et al. (Phys. Rev. Lett. 111:240402, 2013) and argued that photons give “contradictory” answers about where they have been, when traces are locally imprinted on them in different ways. They concluded that their results are comprehensible from what they call the “three-path interference viewpoint,” but difficult to explain from the “discontinuous trajectory” viewpoint advocated by Danan et al. We argue that the weak trace approach (the basis of the “discontinuous trajectory” viewpoint) provides a consistent explanation of the Yuan–Feng experiment. The contradictory messages of the photons are just another example of photons lying about where they have been when the experimental method of Danan et al. is applied in an inappropriate setup.
      PubDate: 2024-02-21
       
  • Hubbard interaction induced non-symmetric spin and pseudo-spin
           entanglement at different valleys of graphene

    • Abstract: Abstract Spin-pseudo-spin intra-particle entanglement of a graphene sheet in the presence of Rashba and Hubbard interactions has been investigated. Hubbard interaction is given by the mean-field approach where we have employed the realistic value of the Hubbard interaction strength of graphene, which has been provided by theoretical computations previously performed in this field. Results show that the Hubbard interaction with its realistic strength removes spin and pseudo-spin entanglement at one of the valleys, whereas this significantly enhances the spin and pseudospin entanglement at the other valley. Accordingly, spin and pseudospin entanglement appears to be non-symmetric between these two valleys.
      PubDate: 2024-02-20
       
  • Cosmic expansion beyond $$\Lambda$$ CDM: investigating power-law and
           logarithmic corrections

    • Abstract: Abstract The cosmic acceleration observed in the expansion of the Universe has sparked extensive research into the nature of dark energy, which is known to constitute approximately 70% of the Universe’s energy content. In this study, we explore two parametrizations of the Hubble parameter, namely power-law and logarithmic corrections, as alternatives to the standard \(\Lambda\) CDM model. Using observational data from Cosmic Chronometers (CC), Pantheon+, and the Baryonic Acoustic Oscillations (BAO) datasets, we investigate the dynamics of essential cosmological parameters, including the deceleration parameter, energy density, pressure, and equation of state (EoS) parameter. The Om(z) diagnostic test is employed to classify different dark energy models. Our cosmological models, with the power-law and logarithmic corrections, are found to provide a good fit to the recent observational data and efficiently describe the cosmic expansion scenario.
      PubDate: 2024-02-20
       
  • Modulation instability spectrum and rogue waves of the repulsive lattices

    • Abstract: Abstract In this work, the modulation instability and solitonic rogue waves are addressed in the repulsive lattice formed by identical particles with nearest neighbor couplings. We use the multiple scale method to derive the extended nonlinear Schrödinger equation with fourth-order dispersion and cubic–quintic nonlinearity. To calculate the modulation instability growth rate, a linear stability analysis is used. Thereafter, we have demonstrated that both fourth-order dispersion and quintic nonlinearity can change the amplitude of the plane wave and bandwidth of the modulation instability in normal and anomalous dispersion regimes. The dynamics of the solitonic rogue waves have been pointed out to show an increasing amplitude with the variation of the free amplitude parameter of the chain of magnets. Via the numerical simulation, the modulated wave patterns have been exhibited to manifest the development of the modulation instability spectrum in the lattice, and the long-time evolution of the continuous waves has brought new features to show an increasing amplitude of the trains of pulses under the variation of the interaction interatomic parameters. These parameters are revealed to be a suitable tool to manipulate nonlinear objects in nonlinear media where higher-order dispersion competes with nonlinearity.
      PubDate: 2024-02-19
       
 
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  Subjects -> PHYSICS (Total: 857 journals)
    - ELECTRICITY AND MAGNETISM (10 journals)
    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (53 journals)
    - OPTICS (92 journals)
    - PHYSICS (625 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (30 journals)

PHYSICS (625 journals)            First | 1 2 3 4     

Showing 601 - 741 of 741 Journals sorted alphabetically
Tectonics     Full-text available via subscription   (Followers: 15)
The European Physical Journal H     Hybrid Journal   (Followers: 2)
The European Physical Journal Plus     Open Access   (Followers: 1)
The Physics Teacher     Full-text available via subscription   (Followers: 360)
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 22)
Theoretical and Mathematical Physics     Hybrid Journal   (Followers: 8)
Thermal Science and Engineering Progress     Open Access   (Followers: 6)
Transport Phenomena in Nano and Micro Scales     Open Access  
Tribologie und Schmierungstechnik     Full-text available via subscription  
Tribology International     Hybrid Journal   (Followers: 47)
Tribology Letters     Hybrid Journal   (Followers: 9)
Turkish Journal of Physics     Open Access  
Ultrasonics     Hybrid Journal   (Followers: 9)
Ultrasonics Sonochemistry     Hybrid Journal   (Followers: 2)
Ultrasound in Medicine & Biology     Hybrid Journal   (Followers: 10)
Universal Journal of Physics and Application     Open Access  
Unnes Physics Education Journal     Open Access   (Followers: 1)
Vibration     Open Access   (Followers: 30)
Virtual Journal of Quantum Information     Hybrid Journal   (Followers: 3)
Water Waves     Hybrid Journal  
Western Journal of Communication     Hybrid Journal   (Followers: 5)
Women & Performance: a journal of feminist theory     Hybrid Journal   (Followers: 15)
World Journal of Condensed Matter Physics     Open Access   (Followers: 2)
Zeitschrift für angewandte Mathematik und Physik     Hybrid Journal   (Followers: 2)
Фізика і хімія твердого тіла     Open Access  

  First | 1 2 3 4     

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School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


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