• Fabricating microsphere lasers by protein dehydration: A fast fabrication method and excellent lasing propertiesFabricating microsphere lasers by protein dehydration: A fast fabrication method and excellent lasing properties

    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 hi...

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  • Evaluation of thick target PIXE analysis in the 5SDH-2 pelletron accelerator facility at VNU University of ScienceEvaluation of thick target PIXE analysis in the 5SDH-2 pelletron accelerator facility at VNU University of Science

    This paper presents the evaluation of the Thick Target Particle Induced X-rays Emission (TTPIXE) technique using standard samples. The element-dependent standardization factor, H, as a function of X-ray energies is calibrated using standard sample NIST-611 and validated with two standard samples: IAEA-Soil7 and NIES-Pepperbush. The obtained resu...

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  • Breakdown characteristics of composite insulation for high temperature superconducting cableBreakdown characteristics of composite insulation for high temperature superconducting cable

    Polypropylene laminated paper (PPLP) and Kraft paper have been studied as multi-layer insulation for high temperature superconducting cable. The experiment was conducted with AC and impulse voltages. Short-term and long-term breakdown of insulation samples were investigated. The experimental results show that the breakdown voltage becomes smalle...

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  • A simulation study of the amorphous germania structure up to 70 GPaA simulation study of the amorphous germania structure up to 70 GPa

    This work presents the effect of pressure on the local microstructure of amorphous Germania (GeO2). The Molecular Dynamics simulation was performed on systems at 900 K and high pressure up to 70 GPa. The structural properties have been analyzed through the pair correlation function, coordination number distribution, and structure factors. The st...

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  • Enhanced photocatalytic activity using near visible light of ZnO nanorods by doping with Mn²+ ionsEnhanced photocatalytic activity using near visible light of ZnO nanorods by doping with Mn²+ ions

    ZnO is a promising photocatalyst for photocatalytic oxidation of organic compounds under the influence of sunlight that provides clean energy and decomposes sustainable organic pollutants substances. ZnO is found to have non-toxic properties, long-term stability, high carrier mobility, low cost and biocompatibility. However, some disadvantages o...

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  • Effective couplings between two photons and axion in the 3-3-1 modelEffective couplings between two photons and axion in the 3-3-1 model

    The one-loop contribution axion-photon-photon coupling is presented in the framework of the 3-3-1 model, in which the loop diagrams are finite. The decay of axion into two photons is demonstrated. This study shows that it is easy to fulfill dark matter candidate conditions for the axion in the model.

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  • Ag-decorated TiO₂ nanofibers for surface-enhanced raman scatteringAg-decorated TiO₂ nanofibers for surface-enhanced raman scattering

    In this report, SERS substrates based on Ag-decorated TiO2 nanofibers electrospun on a glass substrate (Ag/TiO2/glass) were successfully prepared using electrospinning and photodeposition methods. XRD pattern demonstrated that the crystalline structure of TiO2 nanofibers (TiO2 NFs) consisted of both anatase and rutile phase. SEM images show that...

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  • Dynamic analysis of eccentrically stiffened sandwich thick plates with auxetic honeycomb core and GPL-RC face layers under blast loadingDynamic analysis of eccentrically stiffened sandwich thick plates with auxetic honeycomb core and GPL-RC face layers under blast loading

    This study analyses eccentrically stiffened sandwich thick plates with the core layer made of negative poisson material. The analytical method based on the first order shear deformation theory (FSDT) is applied to analyse dynamic response and vibration of the plates. The numerical results of the study have been compared with other studies to eva...

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  • CTAB-assisted synthesis and characterization of FePd nanoparticlesCTAB-assisted synthesis and characterization of FePd nanoparticles

    In this study, Fe50Pd50 nanoparticles with small size of around 5-9 nm were prepared by sonoelectrodeposition in the presence of cetyltrimethylammonium bromide (CTAB) surfactant. The as-prepared nanoparticles were annealed at 550oC for a series of times from 1 h to 6 h. After annealing, a transformation from a disordered face-centered-cubic stru...

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  • Nghiên cứu tính axit và khả năng trung hòa axit của các ion trong thành phần hóa học nước mưaNghiên cứu tính axit và khả năng trung hòa axit của các ion trong thành phần hóa học nước mưa

    Tính axit trong nước mưa được kiểm soát bởi sự hiện diện chủ yếu của H2SO4, HNO3 kết hợp với khả năng trung hòa các cation trong nước mưa. Độ pH là giá trị quan trọng trong đánh giá axit trong nước mưa. Nghiên cứu sử dụng chuỗi số liệu quan trắc chất lượng nước mưa từ năm 2005-2018 ở Việt Nam. Nghiên cứu cho thấy, phân bố pH trung bình tại 23 tr...

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