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Influences of growth temperature and solution concentration on hydrothermal preparation of ZnO nanorod
Abstract. ZnO nanorod structures were grown on glass substrates using a hydrothermal method. Influences of growth temperature and hydrothermal solution concentration on ZnO nanorod structures were investigated. The results indicate that diameter and length of the ZnO nanorod increase with an increasing of growth temperature and hydrothermal sol...
6 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 265 | Lượt tải: 0
Enhanced photocatalytic efficiency of TiO2 with doped Ni-immobilized on silica gel
Abstract. Ni-doped TiO2, immobile on silica gel (Ti1−xNixO2/SiO2), was synthesized using the sol-gel method. The XRD patterns show that the TiO2 particles on SiO2 have an anatase crystalline structure with a particle size of around 7 nm in diameter. The results of absorption spectra indicate that the band gap of the anatase TiO2 powder was 3.3 ...
6 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 287 | Lượt tải: 0
Adsorption of methylene blue from aqueous solutions using activated carbon derived from coffee husks
Abstract. The adsorption of methylene blue (MB) onto activated carbon (AC) derived from coffee husk using zinc chloride activation at 600 oC was studied. The effects of various parameters such as contact time, initial MB concentration and temperature were investigated. The adsorption kinetics of pseudo first-order and pseudo second-order were u...
12 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 338 | Lượt tải: 0
Preparation and optical properties of LaSr2AlO5 doped with Ce and Eu
Abstract. A new host phosphors of LaSr2AlO5 doped with Ce and Eu was synthesized using a solid-state reaction method and the synthesis conditions were investigated. The samples were characterized by X-ray diffraction, scanning electron microscopy, photoluminescent (PL) and photoluminescent excitation (PLE) spectra. LaSr2AlO5:Ce shows a yellow e...
5 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 272 | Lượt tải: 0
Thermodynamic properties of molecular cryocrystals of nitrogen type with fcc and HCP structures in harmonic approximation
Abstract. On the basis of results obtained in the previous paper, by combining the statistical moment method and the self-consistent field method, the thermodynamic quantities for molecular cryocrystals of nitrogen type such as solid α-N2, α-CO, CO2 and N2O with face-centered cubic (FCC) structure and solid β-N2 with hexagonal close packed (HCP...
8 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 298 | Lượt tải: 0
Effect of transition metal ion substitution on structure and optical properties of ZnWO4 material
Abstract. In this presentation, we investigate the effects of transition metal (Fe, Co, Ni) substitution on structure and optical properties of ZnWO4 nanopowder prepared using the hydrothermal method. The prepared powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman scattering and optical absorption s...
8 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 252 | Lượt tải: 0
Structure of polyaza-heterocycles obtained from reaction of two (3-methylfuroxan-4-yl)phenylhydrazines with formaldehyde
Abstract. 2-Methoxy-5-(3-methylfuroxan-4-yl)phenylhydrazine (Hy1) and 4,5- methylendioxy-2-(3-methylfuroxan-4-yl)phenylhidrazine (Hy2) were introduced in the reaction with paraformaldehyde in the presence of acetic acid as catalyst to afford two new polyaza-heterocyclic compounds: 2,5-bis[2-methoxy-5-(3-methylfuroxan-4-yl) phenylamino]-1,2,4,5-...
8 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 235 | Lượt tải: 0
Thermodynamic properties of a ternary interstitial alloy with BCC structure: Dependence on temperature, concentration of substitution atoms and concentration of interstitial atoms
Abstract. The analytic expressions of the thermodynamic quantities such as mean nearest neighbor distance, free energy, free isothermal and adiabatic compressibilities, free isothermal and adiabatic elastic moduli, thermal expansion coefficient, the heat capacities at constant volume and at constant pressure and entropy of a ternary interstitial...
10 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 277 | Lượt tải: 0
Modeling the dynamic mechanisms of HIV infection and the effectiveness of drug treatment
Abstract. HIV treatment is much more difficult and complicated than other virus disease treatments because of the unclear HIV starting moment and due to the up and down behavior of the body resistance system. In this work we created a simple dynamic model for HIV infection with three parameters: the concentration of HIV virus, the concentration ...
7 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 250 | Lượt tải: 0
Higgs boson production in γµ− collision in the randall-sundrum model
1. Introduction The LHC discovery of a 126 GeV Higgs boson [1, 2] confirms the great success of the SM in describing electroweak phenomena, but with SM there are still many unanswered issues [3]. One is the question of hierarchy that arises from the quadratic divergence of the Higgs mass, suggesting the presence of some underlying physics in th...
9 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 330 | Lượt tải: 0