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 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
Scalar sector interactions in BDW model
VNU Journal of Science: Mathematics - Physics - - 2024
Tran Minh Hieu, Dinh Quang Sang
In the Bélanger-Delaunay-Westhoff model, vectorlike fermions and a new scalar sector charged under an extra Abelian gauge symmetry are introduced to explain the flavor observables, and the muon . In this paper, we focus our study to the scalar sector of this model and the relevant interactions. The interaction terms including the exotic Yukawa, the gauge interactions, and the scalar 3-point and 4-...... hiện toàn bộ
Properties of (x)CoFe2O4-(1-x)BiFeO3 multiferroic composites
VNU Journal of Science: Mathematics - Physics - Tập 27 Số 4 - 2011
Abstract:  The crystal structure and optical as well as electromagnetic properties of multiferroic (x)CoFe2O4-(1-x)BiFeO3 (x=0.0÷0.5) composites prepared by solid state reaction method have been systematically investigated. The XRD analysis indicated that both spinel CoFe2O4 (CFO) and perovskite BiFeO3 (BFO) phase simultaneously exist in the sintered composite. Absorption spectra showed the optica...... hiện toàn bộ
Stability of the elastoplastic thin round cylindrical shells subjected to torsional moment at two extremities
VNU Journal of Science: Mathematics - Physics - Tập 21 Số 3 - 2005
Abstract
Some Runge-Kutta Algorithms with Error Control and Variable Stepsizes for Solving a Class of Differential-Algebraic Equations
VNU Journal of Science: Mathematics - Physics - Tập 36 Số 4 - 2020
Phan Quang Tuyen
In this paper, we propose and discuss numerical algorithms for solving a class of nonlinear differential-algebraic equations (DAEs). These algorithms are based on half-explicit Runge-Kutta methods (HERK) that have been studied recently for solving strangeness-free DAEs. The main idea of this work is to use the half-explicit variants of some well-known embedded Runge-Kutta methods such as Runge-Kut...... hiện toàn bộ
Effect of halide anions on structure of 1-butanol monolayer/water interface probed by sum-frequency vibrational spectroscopy
VNU Journal of Science: Mathematics - Physics - Tập 33 Số 1 - 2017
In this report, we use a sum-frequency generation vibrational spectroscopy to measure SFG spectra from 1-Butanol monolayers on pure water and halide saline solution interfaces. These spectra indicate that halide anions have different effects on the structure of 1-Butanol monolayer/water interfaces. The obtained SFG spectra suggest that the I¯ anions mostly disturb the interfacial structure due to ...... hiện toàn bộ
Path integral quantization of self-interacting scalar íìeld with higher derivatives
VNU Journal of Science: Mathematics - Physics - Tập 23 Số 4 - 2007
Abstract:
Influence of the Finite Size Effect on Properties of a Weakly Interacting Bose G as in Improved Hatree-fock Approximation
VNU Journal of Science: Mathematics - Physics - Tập 34 Số 3 - 2018
Nguyen Van Thu
The finite size effect causes many interesting behaviors in properties of a weakly interacting Bose gas. These behaviors were considered in one-loop approximation of quantum field theory. In this paper the influence is investigated in improved Hatree-Fock approximation, which gives more accurate results.
Determination of the Optimum Values of the Natural Frequency of the Nanocomposite Multilayer Organic Solar Cell by using Basic Differential Evolution Optimization Algorithms
VNU Journal of Science: Mathematics - Physics - Tập 39 Số 1 - 2023
By the analytical approach, the equation of natural frequency of nanocomposite multilayer organic solar cell (NMOSC) is analyzed in this work. The NMOSC is composed of 6 layers: Al, LiF, P3HT: PCBM, PEDOT: PSS, ITO and Glass. By using the classical plate theory, the Hooke’s Law, the geometrical compatibility equation and the nonlinear equilibrium equations are proposed. These equations combined wi...... hiện toàn bộ
Tổng số: 761   
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