Communications in physics

Xem 1-20 trên 633 kết quả Communications in physics
  • Part 1 book “Teaching and learning in physical therapy – From classroom to clinic” has contents: Filters - individual factors that influence us as teachers and learners; reflection and questions - developing self- awareness and critical thinking for continuous improvement in practice, communication and conflict negotiation - facilitating collaboration and empowering patients, family members, and peers,… and other contents.

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  • Communications in Physics,

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  • Communications in Physics

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  • This study investigated the learning impact of online scafolding in sustaining a community of inquiry in Physics instruction. The students’ a-priori e-learning activities in online discussion were used in leveraging the learning behaviors of the students. Online learning segments were included in the process of developing classroom tasks vis-à-vis with the course intended learning outcomes.

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  • In this article, the micro-particle sieving capability of optical tweezers arrays in Germanium modulated by ultrasonic waves is presented. The sieving processes are controlled by changing of initial phase or intensity and frequency of ultrasonic waves. The simulation results show that the optical tweezers arrays will act as the dynamical one, which can sieve the dielectric micro-particles in 3D space in the embedding fluid.

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  • The process of e+e − → µ +µ − in models, namely Randall - Sundrum, Supersymmetric and Unparticle physics are studied in details. We calculate the cross-section for γ, Z, U, h, φ, h0, H0, A0 exchange when the e+, e −, µ +, µ − beams are polarized and unpolarized. The results show that the cross-section strongly depends on the exchange particles contributions and polarization of the initial and final beams.

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  • In this paper, the formulation of theories extended by an additional Abelian gauge symmetry in the superfield formalism is presented. By rotating in the space of the gauge fields, the gauge kinetic mixing term can be eliminated, and the relevant charge and coupling are shifted in comparison with the original quantities. We demonstrate, for example, the effect of the gauge kinetic mixing term in the case of the U(1) extension of the minimal supersymmetric standard model.

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  • We study how the trapping time of an electron in a circular graphene quantum dot depends on the electron’s angular momentum and on the parameters of the external Gaussian potential used to induce the dot. The trapping times are calculated through a numerical determination of the quasi-bound states of electron from the two-dimensional Dirac-Weyl equation. It is shown that on increasing the angular momentum, not only the trapping time decreases but also the trend of how the trapping time depends on the effective radius of the dot changes.

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  • Noise is unavoidable in practice and its presence makes quantum protocols imperfect. In this paper we consider a way to cope with typical types of noise in joint remote preparation of an arbitrary 2-qubit state. The idea is to use nonmaximally (in stead of maximally) entangled states as the initial quantum channel.

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  • The results showed that the threshold intensity of OB in Λ-type system is much less than the other ones and the threshold intensity of OB in V-type system is the largest one. The analytical result is convenient to choose excitation configuration for experimental observations and related applications in photonic devices.

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  • In this paper we present the Einstein equation extended in six-dimensions (6D) from the formalism of codimension-2 brane, which is created by a 4-brane and 4-anti brane moving in the warped 6D bulk space-time. The system of equations of motion for the dynamical codimension2 brane has been derived to describe the cosmological evolution on the probe branes. Some cosmological consequences are investigated.

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  • The results are in good agreement with experiments showing that E22K amyloid self-aggregates faster than the WT form. Detailed information of tmE22K trimer structure and kinetics probably yield the understanding of AD mechanism.

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  • In this paper we review our works in the field of nonlinear optics in waveguide arrays (WAs) and photonic nanowires. We first focus on the new equation governing light propagation in optical fibers with sub-wavelength cores which simultaneously takes into account (i) the vector nature of the electromagnetic modes inside fibers, (ii) the strong dispersion of the nonlinearity inside the spectral body of the pulse, (iii) and the full variations of the vector mode profiles with frequency.

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  • We study the Higgs-radion mixing and photon collisions. We consider the radion production in high energy photon collisions to search for the radion in the Randall-Sundrum model. Numerical evaluation gives observable cross-section in the future colliders.

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  • The sign of the chirality per unit energy of a HE or EH mode is the same as or opposite to, respectively, the sign of the phase circulation direction. When the fiber radius is large enough, the field in a quasicircularly polarized hybrid mode can be superchiral outside the fiber. In particular, outside a fiber with a radius of 600 nm, the fields in the quasicircularly polarized HE11, HE21, and HE31 modes are superchiral.

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  • The following strategy is used to reconstruct the strange hyperon Ω. In the LHCb experiment, the hadrons p, π and K are identified by the RICH detector with PT threshold > 100 MeV. Only Lambda particles (from channel Λ → p + π) with PT > 500 MeV are chosen to combine with kaon daughter particle in order to reconstruct a strange hyperon Ω. The reconstructed particles are accepted as Ω candidates in the case it satisfies several criteria such as its invariance mass must be located within the window mass ±50 MeV/c2 around the nominal value.

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  • The obtained results were compared with the corresponding values for cement of different countries. The calculated Raeq values of Lao PDR samples are lower than the limit of 370 Bq kg−1 set for building materials. The mean indoor absorbed dose rate is slightly lower than the population-weighted average of 84 nGy h−1 while the corresponding effective dose was 79% less than the dose of 1 mSv y−1 . The results obtained in this study show no significant radiological hazards arising from using Lao PDR cement for construction of houses.

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  • In this work we present the yield ratios of the 179m,gW isomeric pair produced in the photonuclear reactions natW(γ,xn)179m,gW with bremsstrahlung end-point energies of 50-, 55-, 60-, and 65-MeV. The measurements were carried out by the induced activity method in combination with direct γ-ray spectrometry. The measured activities were corrected for overlapping γ-ray peaks, self-absorption of low energy γ-rays and true coincidence-summing effects. The present results are measured for the first time with bremsstrahlung end-point energies beyond the giant dipole resonance region.

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  • The calculations are based on the linearized Boltzmann equation (BE) and the relaxation time approximation, assuming the scattering by acoustic phonons to be quasi-elastic. We consider three physically distinct temperature ranges with respect to phonon scattering: the Bloch-Gruneisen ¨ (BG), equipartition (EP), and inelastic regimes.

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  • We show that if the outermost waveguide of the binary waveguide array hosts the intense component of the truncated Dirac soliton, then Dirac soliton will be repeatedly bent towards the binary waveguide array edge. In the contrast, if the outermost waveguide of the binary waveguide array hosts the weak component of the truncated Dirac soliton, then Dirac soliton will be pushed away from the binary waveguide array edge. To the best of our knowledge, these unique features have not been found in any other systems.

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