VNU Journal of Science: Mathematics - Physics

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Electrical Properties of Nb-Doped TiO2 Thin Films Deposited by Co-sputtering Process
VNU Journal of Science: Mathematics - Physics - Tập 33 Số 3 - 2017
Ngoc Lam Huong Hoang
Nb-doped Ti thin films were fabricated by co-sputtering of TiO2 doped 6 at% by Nb2O5 and Nb targets. The anatase polycrystalline thin films were obtained by post-annealing at 350oC in vacuum atmosphere. The electrical properties of the films were determined by the Hall method using standard clove-leaf geometry. When the Nb concentration increased, the number of electron increased from 4×1018 ...... hiện toàn bộ
Preparation and characterization of nanocomposite Ti02/Sn02 films
VNU Journal of Science: Mathematics - Physics - Tập 24 Số 1 - 2008
Abstract
Preparation of CuO Nanorods by Thermal Oxidation in Ozone Ambient
VNU Journal of Science: Mathematics - Physics - Tập 38 Số 2 - 2022
Tuyen Nguyen Viet
CuO nanorods were prepared by thermal oxidation method in ozone ambient. The effect of annealing temprature in the range from 400 to 600 oC on morphology and structure of nanorods was studied thouroughly by scanning electron microscopy (SEM) and X-ray diffraction, combining with energy dispersive spectroscopy (EDS) and Raman spectroscopy. The results showed that annealing temprature strongly affec...... hiện toàn bộ
Calculation of Lindemann's melting Temperature and' Eutectic Point of bcc Binary Alloys
VNU Journal of Science: Mathematics - Physics - Tập 26 Số 3 - 2010
Abstract
Buckling analysis of eccentrically stiffened functionally graded circular cylindrical thin shells under mechanical load
VNU Journal of Science: Mathematics - Physics - Tập 29 Số 2 - 2013
Abstract: An analytical approach is presented to investigate the linear buckling of eccentrically stiffened functionally graded thin circular cylindrical shells subjected to axial compression, external pressure and tosional load. Based on the classical thin shell theory and the smeared stiffeners technique, the governing equations of buckling of eccentrically stiffened functionally graded circular...... hiện toàn bộ
Energy transfer studies of Dy3+ ions doped K2GdF5 crystal
VNU Journal of Science: Mathematics - Physics - Tập 28 Số 2 - 2012
Abstract. Dy3+ -doped K2GdF5 single crystals were synthesized under hydrothermal condition. The UV excitation spectra and lifetimes of K2GdF5:Dy3+ were measured at room temperature. The excitation spectra have shown charge transfer state (CTS) of Dy3+ and energy transfer from Gd3+ to Dy3+ ions in K2GdF5:Dy3+ crystal. The decay curve of the K2GdF5 sample doped with 5.0 mol % Dy3+ ions is a non – ex...... hiện toàn bộ
Structural and Physical Properies of Y- doped BiFeO3 Material Prepared by Sol-gel Method
VNU Journal of Science: Mathematics - Physics - Tập 29 Số 3 - 2013
Abstract: Y - doped BiFeO3 materials were prepared by a sol – gel method. X-ray diffraction (XRD) meansurement has been carried out to characterize crystal structure and to detect the impurities existing in these materials. The results showed that both lattice constants a and c of the unit cell of BiFeO3 substance become smaller as the Y3+ content is increased. The effect of introducing Y3+ was to...... hiện toàn bộ
Characteristics of parametric amplification of low frequency regions
VNU Journal of Science: Mathematics - Physics - Tập 20 Số 3AP - 2017
Thanh Thi Ha Mai
Abstracts
High-frequency Collective Ionic Dynamics in Liquid Metals
VNU Journal of Science: Mathematics - Physics - Tập 38 Số 4 - 2022
Tran Thi Nhan, Le Tuan
Abstract: The coexistence of the transverse and fast sounds of liquid metals in the terahertz range near the melting point is explained. These sound modes are phonon polaritons arisen from the interaction between the transverse collective ionic oscillations, known as phonons, and the electromagnetic wave radiated by the ions in vibration at high enough frequencies, for instance, in liquid Zn, Cu, ...... hiện toàn bộ
Dynamics and mechanism diffusion in silica liquid: Insight from simulation
VNU Journal of Science: Mathematics - Physics - Tập 28 Số 1 - 2012
Abstract. In this paper, we numerically study the diffusion mechanism at atomic level in silica liquid via molecular dynamics simulation. The model consisting of 1998 particles and using the BKS potential has been constructed at the temperature from 2600 to 4500 K. Furthermore, we track the evolution of network units with x=4, 5 and 6 over different time. The simulation shows that the diffusivity ...... hiện toàn bộ
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