VNU Journal of Science: Mathematics - Physics

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The electric, magnetic and magnetocaloric properties of perovskite
VNU Journal of Science: Mathematics - Physics - Tập 20 Số 3AP - 2017
Tho Duc Nguyen
Abstracts
Optical Properties of Anatase and Rutile TiO2:Cr3+ Powders
VNU Journal of Science: Mathematics - Physics - Tập 30 Số 2 - 2014
Abstract: Anatase TiO2 powders doped with 0.5, 1.0, 4.0 and 10 mol% Cr3+ have been prepared by hydrothermal method. The Cr3+ concentration and annealing effects on crystalline structure, absorption and photoluminescent spectra of the synthesized samples have been investigated. The band gap energy of anatase and rutile TiO2:Cr3+ powders with different dopant contents has been determined. Urbach ene... hiện toàn bộ
Electrochemical quartz crystal microbalance study of electrodeposition of copper-selenium thin films
VNU Journal of Science: Mathematics - Physics - Tập 29 Số 2 - 2013
Abstract: The deposition of Copper-Selenium thin films was studied by using a combination of Cyclic Voltammetry (CV) and Electrochemical Quartz Crystal Microbalance (EQCM). The values of the equivalent atomic mass (M/z) grown at the gold EQCM sensor during electrodeposition at varying potentials and constant potentials were analyzed to understand the mechanism of the growing process. The compositi... hiện toàn bộ
Analysis of Linear Elastic Fracture Mechanics for Cracked Functionally Graded Composite Plate by Enhanced Local Enriched Consecutive-interpolation Elements
VNU Journal of Science: Mathematics - Physics - Tập 37 Số 1 - 2021
Nguyen Dinh Duc
This paper reports the application of consecutive-interpolation procedure into four-node quadrilateral elements for analysis of two-dimensional cracked solids made of functionally graded composite plate. Compared to standard finite element method, the recent developed consecutive-interpolation has been shown to possess many desirable features, such as higher accuracy and smooth nodal gradients it ... hiện toàn bộ
Predict optical properties of Dy3+ ions doped double potassium gadolinium fluoride crystal from absorption spectra
VNU Journal of Science: Mathematics - Physics - Tập 28 Số 2 - 2012
Abstract. Double potassium gadolinium fluoride crystal doped with 5.0 mol % of Dy3+ ions (K2GdF5:Dy3+) was synthesized under hydrothermal condition. The absorption, luminescence spectra and lifetime of K2GdF5:Dy3+ sample were measured at room temperature. Judd – Ofelt (JO) theory is used to study the spectral properties and to calculate the radiative transition probabilities. The prediced branchin... hiện toàn bộ
Calculation of melting temperature applied to fcc alloys
VNU Journal of Science: Mathematics - Physics - Tập 20 Số 3AP - 2017
Dung Trung Tran
Abstracts
Streaming Potential in Unconsolidated Samples Saturated with Monovalent Electrolytes
VNU Journal of Science: Mathematics - Physics - Tập 34 Số 1 - 2018
Luong Duy Thanh
The streaming potential coefficient of liquid-rock systems is theoretically a very complicated function depending on many parameters including temperature, fluid concentration, fluid pH, as well as rock parameters such as porosity, grain size, pore size, and formation factor etc. At a given porous media, the most influencing parameter is the fluid conductivity or electrolyte concentration. Therefo... hiện toàn bộ
Heoretical approach to singl e - mode operation of bistable fabry - perot laser containing saturable absorber
VNU Journal of Science: Mathematics - Physics - Tập 18 Số 1 - 2002
Abstract
Epitaxial-like Growth of Solution-processed PbZr0.4Ti0.6O3 Thin Film on Single-crystal Nb-doped SrTiO3 Substrate
VNU Journal of Science: Mathematics - Physics - Tập 33 Số 4 - 2017
Trinh Bui Nguyen Quoc
PbZr0.4Ti0.6O3 (PZT) thin films have been conventionally fabricated on traditional silicon substrates with a platinum bottom electrode; however, as a consequence of unit cell mismatch, the films are difficult to form as an epitaxial-like growth. Hence, PZT films deposited on single-crystal niobium doped SrTiO3(111) substrates (Nb:STO) are promising to solve this issue thanks to the similar perovsk... hiện toàn bộ
Arbitrary Power Splitting Couplers Based on 5x5 Multimode Interference Structures for VLSI Photonic Integrated Circuits
VNU Journal of Science: Mathematics - Physics - Tập 27 Số 3 - 2011
Abstract. Chip level optical links based on VLSI photonic integrated circuits have been proposed to replace metal electrical data paths in cases where high frequencies make electrical traces impractical. This is especially relevant to high-speed clock signals as silicon CMOS circuit technology is scaled higher in speed to the GHz range and beyond. In this paper, new structures of optical couplers ... hiện toàn bộ
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