VNU Journal of Science: Mathematics - Physics

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Verification of hazard, race and deadlock in GAlS-circuit
VNU Journal of Science: Mathematics - Physics - Tập 26 Số 1 - 2010
Abstract
Nambu-goldstone Modes in Two Segregated Bose-einstein Condensates Limited by Two Hard Walls
VNU Journal of Science: Mathematics - Physics - Tập 39 Số 3 - 2023
Hoang Van Quyet
 The Nambu-Goldstone (NG) modes in the system of two segregated Bose-Einstein condensates (BECs) limited by two hard walls are studied by means of the Gross-Pitaevskii (GP) theory. Based on the double-parabola approximation (DPA) combining with the Bogoliubov-de Gennes (BdG) equations we found four NG modes that proves the failure of the Watanabe-Brauner counting rule and, furthermore, their ...... hiện toàn bộ
Characterized rings by pseudo - injective modules
VNU Journal of Science: Mathematics - Physics - Tập 24 Số 2 - 2008
Abstract
Metal – Organic Frameworks: State-of-the-art Material for Gas Capture and Storage
VNU Journal of Science: Mathematics - Physics - Tập 32 Số 1 - 2016
Abstract: The capture and storage of gases for the applications of energy, environment, and biomedicine are closely related to the major concerns of the modern world about energy crisis, air pollution and global warming, and human’s health. Many materials and techniques have been developed to tackle these widespread issues, in which metal-organic frameworks (MOFs) – a new class of porous materials...... hiện toàn bộ
Synthesis and Characterization of Ni2+-doped SnO2 Powders
VNU Journal of Science: Mathematics - Physics - Tập 35 Số 4 - 2019
Trinh Thi Loan
In this study, SnO2:Ni2+ powders with dopant contents ranging from 0.0 to 12 mol% were synthesized by sol-gel method. The samples were characterized by X-ray diffraction (XRD) Raman spectroscopy, energy-dispersive X-ray spectrometer (EDS) and photoluminescense (PL) spectra. The XRD analysis shows that the samples doped with low Ni- concentrations exhibited single SnO2crystalline phase, whereas the...... hiện toàn bộ
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
Control problem on timed place/transition nets
VNU Journal of Science: Mathematics - Physics - Tập 20 Số 4 - 2004
Abstract
Research and Fabrication of an Antenna Based on Meta-materials with Negative Refractive Index
VNU Journal of Science: Mathematics - Physics - Tập 32 Số 4 - 2016
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
Fabricating Microsphere Lasers by Protein Dehydration: A Fast Fabrication Method and Excellent Lasing Properties
VNU Journal of Science: Mathematics - Physics - Tập 37 Số 4 - 2021
Ta Van Duong
Microsphere biolasers have attracted a great deal of interest due to their potential in biosensing and cell-tracking. Various fabrication techniques have been explored for making microsphere biolasers, such as freeze-drying in a vacuum, standard oil in water dispersion procedure and protein dehydration in a solvent. The protein dehydration is highly interesting due to its simplicity and fast proce...... hiện toàn bộ
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
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