VNU Journal of Science: Mathematics - Physics

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Development of Laser Beam Diffraction Technique for Determination of Thermal Expansion Coefficient of Polymeric Thin Films
Nguyen Nang Dinh, Nguyen Van Thuan, Tran Vinh Son, Tran Quang Trung, Tran Thi Thao
Laser beam diffraction by a patterned surface has been investigated theoretically and experimentally for the determination of the thermal expansion coefficient (a) of polymeric materials. By tracking the deviation of the first order diffraction mode from surface-patterned polymers, expansion coefficients in a range 10-7 to 10-4 K-1 can be measured by temperature changes less than 100 oC. A set-up ...... hiện toàn bộ
Research and Fabrication of an Antenna Based on Meta-materials with Negative Refractive Index
Abstract: For fast developing materials science, the communication technology also introduces new applications especially in the field of application of new materials and devices. Meta-materials with repeating structures that exhibit the negative refractive index, negative dielectric constant, and negative magnetic permeability promise many benefits in the wireless communication using a new class ...... hiện toàn bộ
Electronic structure of Eu-doped CaO by density functional theory
Abstract: We report the ab initio calculation of electronic structure of Eu-doped CaO. The obtained results appeared in a very good agreement with experimental data and predicted the existence of a ferromagnetic state for one doped compound. The light doping could induce the electron trapping property and the heavy doping the half-metallic ferromagnetic state.Keywords. CaO; DFT; electronic structu...... hiện toàn bộ
Magnetic memory effect in FePd nanoparticles prepared by sonoelectrochemistry
Abstract: Magnetic memory effect was newly observed in hard magnetic FePd nanoparticles prepared by sonoelectrochemistry. The applied magnetic field was changed in defined protocols during the magnetic relaxation process and the magnetic memory effect occurs when the field changes are larger than the critical field change of around 25 Oe. This magnetic memory effect can be explained by the magneti...... hiện toàn bộ
Nonlinear Vibration of Porous Funcationally Graded Cylindrical Panel Using Reddy’s High Order Shear Deformation
Nguyen Dinh Duc
The nonlinear dynamic response and vibration of porous functionally graded cylindrical panel (PFGCP) subjected to the thermal load, mechanical load and resting on elastic foundations are determined by an analytical approach as the Reddy’s third order shear deformation theory, Ahry’s function… The study results for dynamic response of PFGCP present the effect of geometrical ratio, elastic foundatio...... hiện toàn bộ
First-principles Studies of CO2 and NH3 Gas Molecules Adsorbed on Graphene Nanoribbons
Abstract: We present first-principles studies of CO2 and NH3 adsorbed on graphene nanoribbons (GNRs). The electronic and transport properties are calculated based on density functional theory combined with non-equilibrium Green's function method. Absorption energy, density of states, electron density deformation, charge transfer, current-voltage characteristics, and transmission spectra were analy...... hiện toàn bộ
Synthesis and optical properties of ZnAl2O4/Al2O3:Cr3+ composite materials
Trinh Thi Loan
Zinc aluminate - alumina (ZnAl2O4/Al2O3) systems doped with Cr3+ different concentrations were synthesized by sol-gel method. The samples were characterized by X-ray diffraction (XRD), photoluminescence (PL) and photoluminescence excitation (PLE) spectra. The results showed that Cr3+ dopant concentration had a significant effect on the lattice constants of ZnAl2O4/Al2O3 composite and their lumines...... hiện toàn bộ
quantum theory of the absorption of a weak eletromagnetic wav e by the free carriers intwo dimensional electron system
Abstract
Image and video compression for wireless networks
Abstract
Effect of BaSnO3 Nanoparticle Inclusion on Critical Current Density of GdBa2Cu3O7- Thin Films
Abstract: Effect of BaSnO3 (BSO) nanoparticle inclusion on the critical current density of GdBa2Cu3O7-x (GdBCO) thin films was investigated. BSO nanoparticles were prepared on a thin GdBCO seed layer of < 50 nm thick by using pulsed laser deposition (PLD) technique. The GdBCO superconducting layers were deposited on top of the BSO nanoparticles to produce films with the entire thickness of appr...... hiện toàn bộ
Tổng số: 761   
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