Electronic structures
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In this research, in an attempt to make use of the kaolin resources in Vietnam, we present a synthetic process of zeolite A via hydrothermal from kaolinite, together with the modification process of zeolite A using different metallic cations. The characteristics of the prepared zeolite LTAs such as chemical composition and crystalline structure, as well as their catalytic activity in the methanation reaction of carbon dioxide (CO2) to methane (CH4) were extensively investigated.
8p dianmotminh02 03-05-2024 5 1 Download
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CuO nanoparticles were synthesized by alcohol-assisted hydrothermal method at various pH values, using sodium hydroxide as a precursor for pH control. The chemical composition, morphological and structural properties of the obtained CuO nanoparticles were investigated by the Raman and energy-dispersive X-ray spectroscopies, the field-emission scanning electron microscopy, and the X-ray diffraction.
12p dianmotminh02 03-05-2024 2 1 Download
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This global minimum structure has the shape of a tetragonal bipyramid having two Sc atoms at two tops of pyramids binding with one edge of Ge-Ge. The ground electronic state of the global minimum isomer is the 2B2 state in the C2v symmetry. The most stable isomer of Sc2Ge6 − has been used to study the CO adsorption. The calculated results indicate that the Sc2Ge6 − cluster has a good interaction with the CO molecule. The adsorption positions are around the Sc atom with two stable models include adsorbing the C atom and adsorbing both the C and O atoms of the CO molecule.
7p dianmotminh02 03-05-2024 3 1 Download
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Nano-hydroxyapatite/starch composite was synthesized using in situ precipitation. Starch concentration effect on the structure of composite was examined. Characterization of the obtained samples, The X-ray diffraction and Fourier transform infrared spectroscopy demonstrated the purity of the formed nano-HA in the starch matrix. Morphology studies of the samples, checked by field emission scanning electron microscope and transmission electron microscope, show the effects of starch on the size, shape, and morphology of hydroxyapatite nanoparticles.
6p dianmotminh02 03-05-2024 6 1 Download
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This article presents computational insights into the geometric and electronic structures of NbSi4 −/0 clusters using density functional theory and the CASSCF/CASPT2 method. The anionic and neutral ground states are identified as the 1A′ and 2A′ states, respectively, within a trigonal bipyramidal isomer where the Nb atom occupies the equatorial position. The adiabatic detachment energy for the transition from the anionic ground state 1A′ to the neutral ground state 2A′ is estimated to be 2.30 eV.
8p dianmotminh02 03-05-2024 5 2 Download
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The geometric structure, stability, dissociation channel and magnetism of AgnCo clusters (n = 1–12) have been studied using density functional theory. The results show that the Co atom tends to choose the highest coordination position.
7p videadpool 05-05-2023 5 3 Download
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The objectives of this research work are: Study the clay intercalation by organic dye and develop a process to produce nanoclay-dye pigment with better stability and good performance; Conduct structural characterization to verify the level of intercalation and stability of clay-dye pigment by using X-Ray diffraction (XRD) and Transmission Electron Microscopy (TEM); Investigate the thermal stability of clay dye pigment using Thermo Gravimetric Analysis (TGA) to reveal the effect of dye intercalation into the clay on improving thermal stability of organic dye; Compound the clay- pigment with ...
141p runthenight07 01-03-2023 3 3 Download
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This thesis presents the following contributions. First, it is identified that disturbance estimation based networks utilised for compensation possess the same polynomial architectures as signal conditioning anti-windup and their equivalents. Next, an appropriate strategy is identified to integrate disturbance compensation for finite-controlset optimisation schemes via the constraint set rather than the cost function to maintain a simple and elegant problem structure.
208p runordie3 06-07-2022 9 2 Download
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This study pointed out that growing an intercrop and retaining its residues as in situ mulch between the cotton rows can improve soil condition by increasing soil microstructure, water stable aggregation and infiltration rate, and reducing run-off and soil loss.
5p thebadguys 15-01-2022 11 0 Download
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Lecture Electronic commerce - Chapter 18: Social Networks and Industry Disruptors in the Web 2.0 Environment learning objectives: Understand the Web 2.0 revolution, social and business networks and industry and market disruptors. Describe Google and the search engine industry, the impact on advertisement, and the industry competition. Understand the concept, structure, types and issues of virtual communities. Understand the social and business networks and describe MySpace, Flicker, Facebook, CyWorld, and other amazing sites
55p caphesuadathemtac 09-11-2021 33 4 Download
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Lecture Electronic commerce - Chapter 2: E-Marketplaces: Structures, Mechanisms, Economics, and Impacts learning objectives: Define e-marketplaces and list their components. List the major types of e-marketplaces and describe their features. Describe the various types of EC intermediaries and their roles. Describe electronic catalogs, shopping carts, and search engines. Describe the major types of auctions and list their characteristics.
53p caphesuadathemtac 09-11-2021 10 3 Download
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In this thesis, we research and fabricate AgNDs, AgNFs, AuNFs structures on silicon by chemical deposition and electrochemical deposition method for the main purpose of using as SERS substrate. To this target, we have studied the morphology, structure and some properties of the nanostructures produced.
26p extraenglish 24-05-2021 25 3 Download
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In this thesis, we research and fabricate AgNDs, AgNFs, AuNFs structures on silicon by chemical deposition and electrochemical deposition method for the main purpose of using as SERS substrate. To this target, we have studied the morphology, structure and some properties of the nanostructures produced.
26p capheviahe27 23-02-2021 32 4 Download
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The purposes of research "Electronic transport in semiconductor nanostructure based on polar material AlGaN/GaN and Penta-Graphene nanoribbon" studying on electronic transport phenomena in semiconductor nano structures such as AlGaN/GaN and penta-graphene nanoribbon.
37p capheviahe27 23-02-2021 22 4 Download
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In this work, chitosan with an amorphous structure and high surface area (increased 30 times higher than that of initial chitosan) was obtained from the decrystallization of chitosan using a reprecipitation method of chitosan from solution. The chitosan was characterized using X-ray diffraction, Scanning Electron Microscopy (SEM) and Brunauer-Emmet-Teller (BET).
6p tamynhan9 02-12-2020 6 2 Download
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Undoped and Sn-doped ZnO films are deposited on glass substrates using a sol-gel spin coating technique with a doping concentration varying from 0% to 3 mol. The effects of Sn doping concentration on surface morphology, structural and optical properties of the ZnO films are investigated using scanning electron microscopy, an X-ray diffractometer and a UV-Vis-NIR system.
6p tamynhan9 02-12-2020 9 3 Download
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In this study, the authors will show that a semimetal-insulator phase transition may take place in the GaSb/InAs heterostructures due to the exciton pairing between the electrons and holes in the system. In the heterostructure, the top of the valence band of the InAs layer is higher than the bottom of the conduction band of the GaSb layer.
8p tamynhan9 02-12-2020 10 2 Download
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In order to understand the photocatalytic mechanisms of N-doped TiO2 with different doping positions of N, this research performed ab-initio calculations based on density functional theory (DFT) without and with Hubbard U correction, concentrate on the electronic structure of the materials.
8p tamynhan9 02-12-2020 21 1 Download
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In this research, first principle calculations based on Time-Dependent Density Functional Theory (TDDFT) have been used to study the geometry structures, the binding energies and electronic properties of (TiO2)n clusters with n = 1/10. All possible structures of TiO2 clusters have been built, optimized and studied.
7p tamynhan9 02-12-2020 11 2 Download
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An examination of the first-row-transition-metal-doped boron clusters, B14M (M = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, and Cu) in the neutral state, is carried out using DFT quantum chemical calculations. The lowest-energy equilibrium structures of the clusters considered are identified at the TPSSh/ 6- 311+G(d) level. The structural patterns of doped species evolve from exohedrally capped quasi-planar structure B14 to endohedrally doped double-ring tubular when M is from Sc to Cu.
7p nguaconbaynhay9 03-12-2020 12 1 Download