Có 20+ tài liệu thuộc chủ đề "Mathematics – Physics"
tailieu.vn Xem trực tuyến Tải xuống
We derived the analytical expressions of the EXAFS DWF and Debye frequency as functions of temperature. Numerical calculations were performed for Fe 1-y Al y alloys with various Al concentration (y and 0.50) in which Fe-Al alloys still maintained B2 structure.. Our calculations show that DWFs of Fe 1-y Al y alloys increase robustly when temperature and/or Al concentration in...
tailieu.vn Xem trực tuyến Tải xuống
Abstract: This paper studies the effects of the sintering temperature on crystal structure, critical temperature (T c ) and excess conductivity of Bi-Pb-Sr-Ca-Cu-O (BPSCCO) system. The crystal structure of the samples was investigated through X-ray diffraction measurements (XRD) and scanning electron microscopy (SEM). Superconductivity of the samples was analyzed by the temperature-dependent resistivity measurement. The experimental results showed the existence...
tailieu.vn Xem trực tuyến Tải xuống
Highly Selective Separation of CO 2 and H 2 by MIL-88A Metal Organic Framework. The pre-combustion CO 2 capture relates to the separation of CO 2 from H 2 in the syngas mixture.. In the current work, MIL-88A (Fe, V, Ti, Sc) were studied for the first time by using the grand canonical Monte Carlo simulations for the CO 2...
tailieu.vn Xem trực tuyến Tải xuống
Influences of ZnO Nanorod Arrays on Photocatalytic Activity of n-ZnO Nanorods/p-Si Heterostructure. In this work, n-ZnO nanorods/p-Si heterostructures were successfully fabricated by a hydrothermal method at different baking temperatures. The n-ZnO nanorods/p-Si heterostructures show good photocatalytic ability at high baking temperature. The concentration of Rhodamine B can be decreased up to 97% after 150 min treated by the n-ZnO nanorods/p-Si...
tailieu.vn Xem trực tuyến Tải xuống
Integrated Teaching Competency Framework for General Education Program: Suggestions and Recommendations. for Natural Science Teachers. Abstract: This article investigated the general structure of teaching competencies and integrated teaching competencies of natural science teachers in high school education, the actual situation of integrated teaching in Vietnam and some other countries in the world, and the designing of assessment templates to recognize...
tailieu.vn Xem trực tuyến Tải xuống
A Model for Successful Professional Learning Communities to Meet the Requirement of Vietnam Education Reform. This research introduces the policy of Professional Learning Communities to the teachers and it’s a practice at school. This paper shows a model to implement policies regarding the professional development of teachers at school. The results show that the school runs a good model of...
tailieu.vn Xem trực tuyến Tải xuống
Synthesis and Waterproofness Improvement of K 3 AlF 6 :Mn 4+. Phosphor for Warm White Light-emitting Diodes. Abstract: In this study, we synthesized K 3 AlF 6 :Mn 4+ phosphor by co-precipitation method and investigated its crystal structure and photoluminescence properties . By surface modification of K 3 AlF 6 :Mn 4+ using K 3 AlF 6 , the moisture...
tailieu.vn Xem trực tuyến Tải xuống
Electrochromic Properties of PANI/TiO 2 Nanocomposite Films Prepared by Electropolymerization. Abstract: PANI/nc-TiO 2 /ITO composite films were prepared by electrochemical method where the monomer aniline was polymerized onto nano-porous TiO 2 /ITO films (PANI/nc-TiO 2 /ITO). The PANI/nc-TiO 2 heterojunctions were formed in the composite films due to the insertion of PANI in nano-porous TiO 2 particles. The response times...
tailieu.vn Xem trực tuyến Tải xuống
phosphor could be attributed to the 2 E→ 4 A 2 electron transition of Cr 3+ ions. The AlPO 4 :0.3%Cr 3+. The color coordinates of the purple LED prototype imply that AlPO 4 :Cr 3+ phosphors are promosing to be used as deep red phosphor powder for horticulture LED lighting.. Email address: [email protected] https//doi.org vnumap.4617. In addition, it is...
tailieu.vn Xem trực tuyến Tải xuống
Facile Hydrothermal Method for Fabrication of Seedless ZnO Nanorod/GO Composite on PCB. Abstract: Herein we report on a simple method to grow ZnO nanorod/Graphene oxide (GO) array without the initial seed layer on a printed circuit board (PCB) as the substrate based on Galvanic effect. It is shown that the as-prepared ZnO nanorod was grown well-vertically on the substrate. Furthermore,...
tailieu.vn Xem trực tuyến Tải xuống
Dependence of Hydrothermal Time. on Structural Characteristics and Photocatalytic Properties of SnO 2 Nanoparticles. Abstract: In this work, SnO 2 nanoparticles were prepared by hydrothermal method using SnCl 4 .5H 2 O and NaOH at 180 °C for different hydrothermal times. The effect of hydrothermal time on the crystal structure, morphology, chemical bonding, and photocatalytic properties of SnO 2. Structural...
tailieu.vn Xem trực tuyến Tải xuống
Steady State Calculations of the PWR MOX/UO 2 Core with the Monte Carlo Code MCNP6. Abstract: This paper presents the steady-state analysis results of the OECD/NEA and U.S. NRC PWR MOX/UO 2 (MOX: Mixed Oxide) Core Transient Benchmark with the modern MCNP6 Monte Carlo code based on the ENDF/B-VII.1 evaluated nuclear data library. The purpose of the paper was to...
tailieu.vn Xem trực tuyến Tải xuống
Fabricating Microsphere Lasers by Protein Dehydration: A Fast Fabrication Method and Excellent Lasing Properties. In this work, we demonstrate the fabrication of microsphere biolasers using protein dehydration in decanol and demonstrate that the fabrication process can speed up if the solvent is heated. When the solvent is heated to 60 °C, the fabrication time is reduced to half compared with...
tailieu.vn Xem trực tuyến Tải xuống
Evaluation of Thick Target PIXE Analysis in the 5SDH-2 Pelletron Accelerator Facility at VNU University of Science. Abstract: 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...
tailieu.vn Xem trực tuyến Tải xuống
Breakdown Characteristics of Composite Insulation for High Temperature Superconducting Cable. Abstract: Polypropylene laminated paper (PPLP) and Kraft paper have been studied as multi-layer insulation for high temperature superconducting cable. The experimental results show that the breakdown voltage becomes smaller in the order of PPLP, PPLP/Kraft and Kraft, but the lifetime index increases with the presence of Kraft layer in the...
tailieu.vn Xem trực tuyến Tải xuống
A Simulation Study of the Amorphous Germania Structure up to 70 GPa. 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. Correlation between the peaks in the plot of structure factor and the topology...
tailieu.vn Xem trực tuyến Tải xuống
Introduction of Mn ions into ZnO NRs could enhance the photocatalytic activity owing to the increase in the defect sites that effectively suppressed the recombination of free electrons and holes [16-18]. However, there were few reports on visible light photocatalyst activity of Mn-doped ZnO NRs developed on substrates. The different concentrations of Mn doped into ZnO NRs were measured from...
tailieu.vn Xem trực tuyến Tải xuống
Effective Couplings between Two Photons and Axion in the 3-3-1 Model. Abstract: 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. This study shows that it is easy to fulfill dark matter candidate conditions for the axion in the model.. The axion is a CP-odd scalar field which...
tailieu.vn Xem trực tuyến Tải xuống
Abstract: This work studies the linear, the third-order nonlinear, and the total optical absorption coefficients (OACs) and the refractive index changes (RICs) caused by both intra- and inter-band transitions in the WSe 2 monolayer. The expression for the OACs and RICs in the presence of a magnetic field as well as the Zeeman and electric fields are found by using...
tailieu.vn Xem trực tuyến Tải xuống
Synthesis and Characterization of Hierarchical CeO 2 Spherical Nanoparticles for Photocatalytic Degradation. Abstract: In this study, hierarchical CeO 2 spherical nanoparticles were fabricated by the polyol method using Ceri (III) acetate hydroxide, sodium hydroxide, and triethylene glycol as precursors.. one of the most important compounds of rare earth elemental materials, is attracting a lot of research interest because of its...