- Article
Authors: Gôlman, LI (1976) - Những quan điểm của F-Ăng-ghen đối với quá trình nhận thức lịch sử và đối với các đặc điêm của khoa học lịch sử đều cho thấy rằng người chỉ đạo vĩ đại của nền khoa học lịch sử Mác-xit là F. Ăng-ghen đã có một sự chú ý, đặc biêt đối với những vấn đề phương pháp luận và Người đã góp phần cống hiến to lớn vào việc nghiên cứu khoa học những vấn đề đó.
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- Article
Authors: Gôlman, L.I. (1976) - Quan điểm của chủ nghĩa Mác-Lenin, phép biện chứng là công cụ lô-gic chủ yếu của nhận thức lịch sử. Không nên hạn chế những phương tiện loogic của viêc nghiên cứu chỉ ở những cái bắt nguồn từ những quy luật cơ bản của phép biện chứng và không nên loại bỏ tất cả những thủ pháp nghiên cứu khác, trong đó có thủ pháp logic hình thức. Bản thân tính chất phức tạp của quá trình lịch sử, sự khác nhau muôn màu muôn vẻ của các biểu hiện của các quy luật biện chứng, không cho phép vận dụng của một cách tầm thường phương pháp khoa học mà đòi hỏi phải có một quan điểm toàn diện đối với việc nghiên cứu các hiện tượng lịch sử, phải sử dụng rộng rãi kho công cụ nghiên cứu hỗ trợ.
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- Journal Article
Authors: Nguyen, Van Toan; Pham, Van Nhat; Ta, Van Duong (2021) - 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 highly interesting due to its
simplicity and fast processing time. 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 ...
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- Journal Article
Authors: Pham, Thi Hong; Dang, Huu Tung; Nguyen, Hai Anh; et.al (2021) - Ultrathin silicon nitride SiNx membrane suspended on a silicon wafer is a popular twodimensional platform in MEMS applications. The unsupported membrane has a low thermal
conductivity, is electrically insulated, and very robust against mechanical impact. Remarkably thin,
it is difficult to fabricate and manipulate. Recently equipped with a dual chamber system for plasma
enhanced chemical vapor deposition (PECVD) and reactive ion etching, we calibrate it to deposit
silicon nitride Si3N4, silicon dioxide SiO2, and to dry etch these materials. Based on the superb
quality of Si3N4, we perform a through-wafer etch that creates suspended Si3N4 membranes. The
recipe is reliable and rep...
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- Journal Article
Authors: Pham, Thi Hong; Dang, Huu Tung; Nguyen, Hai Anh; Dang, Tuan Linh; Nguyen, Thi Thu Thao; Dinh, Thuy Hien; Nguyen, Minh Hieu; Nguyen, Minh Hue (2021) - Ultrathin silicon nitride SiNx membrane suspended on a silicon wafer is a popular twodimensional platform in MEMS applications. The unsupported membrane has a low thermal
conductivity, is electrically insulated, and very robust against mechanical impact. Remarkably thin,
it is difficult to fabricate and manipulate. Recently equipped with a dual chamber system for plasma
enhanced chemical vapor deposition (PECVD) and reactive ion etching, we calibrate it to deposit
silicon nitride Si3N4, silicon dioxide SiO2, and to dry etch these materials. Based on the superb
quality of Si3N4, we perform a through-wafer etch that creates suspended Si3N4 membranes. The
recipe is reliable and rep...
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- Thesis
Authors: Nghiêm, Xuân Đức; Advisor: Nguyen, Thi An Hang; Tran, Dinh Trinh (2022) - So far, there have been several studies on nanocomposites for CIP treatment. Nevertheless, these nanocomposites either use UV irradiation or lack of the ability to be recovered by magnetic forces (Chen et al., 2019; Costa et al., 2021; Malakootian et al., 2019; Tamaddon et al., 2020). Hence, the present research aims at filling the above research gaps by developing a lab-scale advanced photocatalytic system for effective CIP degradation from aqueous solutions, which is characterized by (1) simultaneous formation of both effective reactive oxygen species (HO• and O2 - •), (2) reduction in recombination rate of photogenerated holes (h+ ) and electrons (e- ) during AOP, (3) effective per...
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- Article
Authors: Shashanka, R.; Esgin, Halil; Yilmaz, Volkan Murat; Caglar, Yasemin (2020) - In the present study, we report on the synthesis of ZnO nanoparticles using Tilia Tomentosa (Ihlamur) leaves extract followed by calcination at 400 C for 15 min. The prepared ZnO nanoparticles were characterized by XRD and SEM to study the phase and microstructure, respectively. The XRD analysis showed the absence of impurity peaks and the SEM image confirmed the spherical nature of the prepared
ZnO nanoparticles with an average particle size of 80 nm. UV-Visible spectroscopy was used to study the optical properties, and the bandgap was calculated to be 3.55 eV. This large bandgap is attributed to the property of the semiconductor, which can be explored for solar cell applications. ...
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- Article
Authors: D.T. Huong Giang; N.H. Duc; G. Agnus; T. Maroutian; P. Lecoeur (2016) - String based MEMS devices recently attract world technology development thanks to their advantages
over cantilever ones. Approaching to this direction, the paper reports on the micro-fabrication and
characterization of free-standing doubly clamped piezoelectric beams based on heterostructures of Pd/
FeNi/Pd/PZT/LSMO/STO/Si. The displacement of strings is investigated in both static and dynamic mode.
The static response exhibits a bending displacement as large as 1.2 am, whereas the dynamic response
shows a strong resonance with a high quality factor of around 35 depending on the resonant mode at
atmospheric pressure. These findings are comparable with those observed in large dim...
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- Thesis
Authors: Hoang, Quang Hung; Advisor: Pham, Van Hoi (2005) - Chapter 1: Microsphere Cavity. Chapter 2: Tapered optical fiber coupling. Chapter 3: Microsphere laser based on Er-doped silica glass
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- Thesis
Authors: Đỗ, Danh Quang; Advisor: Tran, Thi Viet Ha (2023) - The objectives of this research are as follows: Fabrication of superhydrophobic surface on the LS base; Optimization of superhydrophobic surface fabrication parameters on LS base; Characterization of fabricated LS surface using SEM, EDX, FTIR, XRD, and WCA techniques; Evaluation of applicability of fabricated LS in environmental treatment (e.g., oil water separator); Evaluation of reusability and durability of fabricated LS (e.g., pH, abrasion, compression).
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- Theses
Authors: Vũ Minh Thông; Advisor: Pham, Tien Thanh ; Nguyen, Hoang Luong (2019) - The Metal – Insulator – Metal (MIM) nanocups structure on glass substrate
and in water were fabricated by chemical method and sputtering, studied by
transmittance properties. The morphology of the sample was studied by Scanning
Electron Microscope, and transmittance properties were studies by UV-Vis-NIR, and
simulated by Finite Difference Time Domain (FDTD) method. The result showed
that MIM nanocups have surface plasmon resonance (SPR) and localize surface
plasmon resonance (LSPR) phenomena, that depend on size of Polystyrene (PS) and
thickness of metal and insulator layers. The purpose of this thesis is: Deposit monolayer PS nanoparticles on glass substrate ; Fabrication MIM ...
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- Thesis
Authors: Nguyen, Thi Khanh Van; Advisor: Ta, Dinh Canh (2011) - Tổng quan lý thuyết về pin mặt trời truyền thống và đặc biệt là về pin mặt trời sử dụng chất màu. Giới thiệu về vật liệu bán dẫn ZnO và một số nghiên cứu đã có về cấu trúc vùng năng lượng và tính chất quang. Trình bày các phương pháp kĩ thuật được sử dụng để chế tạo và khảo sát tính chất, hình thái học, cấu trúc của màng nano ZnO. Phân tích và khảo sát các kết quả thu được từ các phép đo phổ nhiễu xạ tia X (XRD), ảnh hiển vi điện tử truyền qua (SEM), phổ hấp thụ và truyền qua (UV-vis) và phổ huỳnh quang. Từ đó rút ra khẳng định về việc chế tạo thành công màng nano ZnO. Cuối cùng là phần kết luận và tài liệu tham khảo.
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- Conference Paper
Authors: Ngo, Van Cong (2018) - Landslide is one of the severe natural disasters that cause great losses in lives and property. Therefore, efforts in research, warning, and prevention of landslides have been made at different scales. One of the conditions that triggered landslides is the sudden rise of the rainfall. This paper focuses on building a low-cost rain gauge, which consists of an electrode sensor and a microcontroller board. Alert threshold is determined based on statistical methods in several years to give a timely warning. The system has been successfully built and tested in real experiment.
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- Journal Article
Authors: Nguyen, My Thi Ngoc; Tran, Ha Le Bao (2021) - The acellular adipose matrix (AAM) represents a promising source of biomaterial for applications in soft tissue regeneration. In this study, we aimed to prepare an injectable AAM to serve as a ready-to-use allograft. A fabrication procedure including harvesting, delipidating, and decellularizing was established. Accordingly, we proposed a mechanical disruption during delipidation and a final homogenization to produce the AAM powder in an injectable form. Our results demonstrated that mechanical disruption would enhance the efficiency of fat removal from the tissue and would significantly shorten the delipidation duration. A decellularization strategy composed of Tris–HCl and Sodium Do...
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- Thesis
Authors: Nguyen, Thi Hong Nhung; Advisor: Tran, Thi Viet Ha (2021) - Two simple techniques are hydrothermal and dip-coating was applied with low
temperature and easy to performance. These methods have remarkable advantages and
are the optimal choice for developing superhydrophobic materials without consuming
energy or requiring high technical equipment.
The set of optimal conditions has been found. Reaction temperature of the first
layer of TiO2 is 120oC for 3 hours consecutively with solution pH in the range of 4 5,
this process needs to be repeated at least three times before coating the second layer with
FTDS in immersed temperature is 60oC for 3 hours.
TiO2-FDTS@cotton fabric achieved superhydrophobic state with WCA = 152.9o
1
o
and ...
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- Article
Authors: Ameer, Jimna Mohamed; Venkatesan, Ramesh Babu; Damodaran, Vinod; V, Nishad K.; Arumugam, Sabareeswaran; Asari, Anil Kumar Pallickaveedu Rajan; Kasoju, Naresh (2020) - Tissue engineering is emerging as a modern medicine fascination towards the establishment of human tissue banks; yet, these approaches typically involve cultures of only one type of cell and, therefore, do not recapitulate the native tissue physiology in toto. Co-culture models, comprised of different cell types, can potentially create the next level of complexity. However, conventional approaches involving multiple cell types and cell culture inserts do have limitations. To this end, here we demonstrate a novel cell culture insert that allows the use of any custom-made scaffold, free-flow of fluids/gases, dual cell seeding on either sides of the insert, easy stacking of multiple inse...
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- Journal Article
Authors: Sandhyarani, A.; Kokila, M.K.; Darshan, G.P.; Nagabhushana, H.; Daruka, Prasad B. (2021) - In the present paper, various fluxes assisted Eu3+ doped SrTiO3 nanophosphors were prepared via a solution combustion route. Among all fluxes, NH4F was found to be an appropriate one, which can reduce the forming temperature, improve morphology and enhance the luminescence intensity by two-fold to that of without added flux. Hence, NH4F assisted with SrTiO3:Eu3+ nanophosphor was utilized to fabricate a handy, ink-free photoluminescent writable chalk; which writes information on many complex surfaces at any time and any place. The written original information cannot be visualized upon normal light illumination; but, it was readable under UV 254 nm light. The ink-free nanophosphor-polym...
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- Journal Article
Authors: Quang-Duy Dao (2021) - This article presents optical property, crystal structure, and photovoltaic performance
of perovskite solar cell (PSC) in n-i-p structure using simple single-step solution method with antisolvent drip. The fabricated PSC exhibited a relatively high photovoltaic performance with the best
power conversion efficiency of 15.8% under forward bias scan. The relatively high photovoltaic
performance was probably resulted from the high crystallization, the high absorption coefficient,
and the crack-like void-free on the surface of the perovskite absorbers.
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- Article
Authors: Manikandan, V.; Singh, Monika; Yadav, B.C.; Denardin, Juliano C. (2018) - A Li-CuFe2O4thinfilm has a well-defined nanocrystalline structure with a crystallite size of ~17 nm. The TEM and SEM images of the Li-CuFe2O4thinfilm show a polyhedron shape of nanoparticles with uneven sizes, resulting in a significant change in its gas sensing characteristics such as sensitivity and sensor response. An optical analysis shows that the Li-CuFe2O4thinfilm has a semiconducting nature, and the band gap of the thinfilm is determined to be 1.15 eV. The gas sensor analysis demonstrates repeatability of the sensing behavior of the Li-CuFe2O4 thin film and this ensures a reliable and efficient gas sensor at room temperature.
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- Article
Authors: Dao, Quang-Duy (2020) - We demonstrate an efficient bulk heterojunction (BHJ) organic solar cell (OSCs) utilizing a soluble phthalocyanine derivative, 1,4,8,11,15,18,22,25-octahexylphthalocyanine (C6PcH2), and a fullerene derivative, 1-(3-methoxy-carbonyl)-propyl-1-1-phenyl-(6,6)C71 and roles of processing additive solvent on improvement of the BHJ OSCs. By adding processing additive solvent, filling factor and short-circuit current density are improved to 0.57 and 8.6 mA/cm2, respectively. As a result, the power conversion efficiency of 3.6% is achieved. Otherwise, the effects of processing additive solvent are demonstrated by taking the absorption and photoluminescence spectra of C6PcH2 and composite thin ...
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