Summary of thesis in materials science

The research in this thesis follows two directions: The first, using high performance computing currently available, we studied atomic and molecular emissions in astrophysical environment. The radiative transfer model was applied to explain the characteristics of the recombination line masers Hnα in the envelope of the star MWC 349A.

27p beloveinhouse01 15-08-2021 20 4   Download

Target of thesis: To develop a method that can simplify the determination of the thermodynamic parameters and XAFS spectra which base on the second-order cumulant only. In particular, this method can be applied for both theoretical calculations and experimental measurements in the XAFS method.

27p extraenglish 24-05-2021 34 5   Download

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.

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The research objectives of the thesis: Improve the usability and quality of LED-based lighting products. Develop a new generation of high-efficiency LED lights, evenly distributed, eliminating light pollution, and replacing existing LEDs.

27p extraenglish 24-05-2021 20 5   Download

The objectives of the thesis: Research, fabricate Er3+-doped silica glass microspheres with different sizes by arc discharge method; building an experimental system to investigate WGM mode laser emission spectrum in the optical communication wavelength region ~ 1550 nm of some fabricated microspheres.

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Research objectives of the thesis: Clarification influence of the elements Na, Sr and Ba substituting for La/Ca and crystal size on the magnetic properties, phase transition and magnetocaloric effects of La0,7Ca0,3MnO3 materials. Found the materials for significant mmagnetocaloric parameters have potential for applications in magnetic refrigeration.Determine the effect of replacing Sr/Ba for Ca in La0,7Ca0,3MnO3 and Co substituting for Mn in La0,7Sr0,3MnO3 on their critical behavior as well as the ferromagnetic interactions order.

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The goal of the thesis: The thesis examined the effect of different nanostructured morphologies in conductive polymer films (PPy, PANi) on NH3 gas sensitivity. The thesis fabricated the nanostructured hybrid films between metal oxide (NiO) and conductive polymer (PPy) successfully and examined the NH3 gas sensitivity properties of the NiO / PPy hybrid film.

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Successful synthesis of GdPO4:Tb3+ nanorods and Gd2O3:Eu3+ nanospheres; coating GdPO4:Tb3+ nanorods and Gd2O3:Eu3+ nanospheres with a silica shell, functionalizing with NH2 functional group, conjugating with anti-venom and anti-CEA antibodies for further biomedical applications.

27p capheviahe27 23-02-2021 31 6   Download

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 35 4   Download

The objectives of the thesis: Research, fabricate Er3+-doped silica glass microspheres with different sizes by arc discharge method; building an experimental system to investigate WGM mode laser emission spectrum in the optical communication wavelength region ~ 1550 nm of some fabricated microspheres.

28p capheviahe27 23-02-2021 22 3   Download

The research objectives of the thesis: Improve the usability and quality of LED-based lighting products; develop a new generation of high-efficiency LED lights, evenly distributed, eliminating light pollution, and replacing existing LEDs.

27p capheviahe27 23-02-2021 30 3   Download

Objectives of the study: To find out about orientational CNTs and graphene material - the formation, methods of synthesis, properties and applications; optimization of technological conditions to produce high quality oriented CNT and graphene materials using the thermal CVD method.

28p capheviahe27 23-02-2021 17 3   Download

The objectives of the thesis is: Determination of the concentration of the Naturally Occurring Radioactive Materials (NORM) in some building materials commonly used in Lao PDR such as cement, sand, etc. by gamma spectrometers using NaI(Tl) and HPGe detectors.

27p larachdumlanat129 20-01-2021 52 3   Download

The layout of the thesis: In addition to the introduction, conclusion, list of symbols and abbreviations, list of tables, list of images and drawings, list of published works related to the thesis. Project, appendices and references.

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In Vietnam, currently the study of fuel cells is almost neglected and there is very little fundamental research on this issue. The research on fuel cells of our country is at innitial stage, mainly researching catalytic material in the laboratory and almost has not research in the technology of manufacturing fuel cell (stack).

28p larachdumlanat129 20-01-2021 25 5   Download

Preparing of zirconia/silane combined films on steel subtrate for organic coatings to replace phosphate and chromate pretreatment; proposing the mechanism of film formation process and assessing characteristics of morphology, composition, electrochemical properties and bonding of the zirconia/silane film.

27p larachdumlanat129 20-01-2021 39 4   Download

Preparing of zirconia/silane combined films on steel subtrate for organic coatings to replace phosphate and chromate pretreatment. Proposing the mechanism of film formation process and assessing characteristics of morphology, composition, electrochemical properties and bonding of the zirconia/silane film.

27p trinhthamhodang7 31-08-2020 22 3   Download

Study on modification/functionalization of conductive polymers using nanostructured materials (CNTs, Fe3O4 nanoparticles and Graphene) to develop the electrochemical biosensor and apply this biosensor in biomedical and environmental analysis.

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Study on fabrication proton exchange membrane fuel cell (PEMFC). Characteristics and selection of the optimal catalyst material and composition for the catalyst layer in membrane electrodes assembly (MEA) and to evaluate influence of manufacturing technological parameters on MEA properties and from that basis master core technology to develop MEA manufacturing process.

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To develop a method that can simplify the determination of the thermodynamic parameters and XAFS spectra which base on the second-order cumulant only. In particular, this method can be applied for both theoretical calculations and experimental measurements in the XAFS method.

27p trinhthamhodang7 27-08-2020 36 3   Download