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Nguyen Thi Thuy,Phuong Dinh Tam,Mai Anh Tuan,Anh-Tuan Le,Le Thi Tam,Vu Van Thu,Nguyen Van Hieu,Nguyen Duc Chien 한국물리학회 2012 Current Applied Physics Vol.12 No.6
The present paper introduces a facile and cost-effective route for the direct dispersion of multi-walled carbon nanotubes (MWCNTs) in DNA solution. Their application in detecting Escherichia coli O157:H7using DNA biosensorwas demonstrated. The dispersion state of theMWCNTswas characterized via UVeVis spectroscopy, transmission electron microscopy, and field emission scanning electron microscopy. The interaction between DNA sequence and the MWCNTs was investigated using Raman spectroscopy and Fourier transform infrared spectroscopy. As-obtainedMWCNT solutionwas used in the preparation of DNA sensor. Results revealed that the developed DNA sensor can detect a DNA target as low as 1 nM in a buffer solution. The sensitivity of the DNA sensor reached approximately 0.19 nM/mV. The effect of dispersion parameters, including pH values, DNA concentration, ion strength, and sonication time, on sensor response was also studied. TheDNA sensor can respondwell to 120 min of sonication time, a pH value of 9, and 20 mM of DNA sequence concentration. The results of the present study showed a potential application of the DNA sensor in the detection of Escherichia coli O157:H7.
Nguyen, Thi Tam Anh,Nguyen, Duy Doai Korea Institute for ASEAN Studies 2021 Suvannabhumi Vol.13 No.1
The Ramayana is a very popular epic in Southeast Asia. It is the story of King Rama who must save his kidnapped wife, Sita. After Sita was abducted by the Demon King Ravana (Tosakanth) and taken to Lanka, Rama and his brother rescued her with the help of the monkey warriors, especially with the help of the Monkey King Hanuman. Along the way, the epic teaches Hindu life lessons. Today The Ramayana is told and retold through literature, theatre, orally, in movies, and is referenced in many other forms of popular culture. Nowadays, in Thailand, Ravana and Hanuman deconstruct the role of divine and become folk deities that also find their places in calendar art, advertising and stamps, etc. And in Vietnam, Ravana and Hanuman have become the two figures that can't be absent from Southern Vietnam Khmer ceremonies. In this article, our aim is to show how Ravana and Hanuman became symbols of popular culture (case studies in Thailand and Vietnam). The data provided in this article is drawn from field surveys with reliable reference resources.
( Nguyen Thi Tam Anh ),( Nguyen Duy Doai ) 부산외국어대학교 아세안연구원(구 부산외국어대학교 동남아지역원) 2021 Suvannabhumi Vol.13 No.1
The Ramayana is a very popular epic in Southeast Asia. It is the story of King Rama who must save his kidnapped wife, Sita. After Sita was abducted by the Demon King Ravana (Tosakanth) and taken to Lanka, Rama and his brother rescued her with the help of the monkey warriors, especially with the help of the Monkey King Hanuman. Along the way, the epic teaches Hindu life lessons. Today The Ramayana is told and retold through literature, theatre, orally, in movies, and is referenced in many other forms of popular culture. Nowadays, in Thailand, Ravana and Hanuman deconstruct the role of divine and become folk deities that also find their places in calendar art, advertising and stamps, etc. And in Vietnam, Ravana and Hanuman have become the two figures that can’t be absent from Southern Vietnam Khmer ceremonies. In this article, our aim is to show how Ravana and Hanuman became symbols of popular culture (case studies in Thailand and Vietnam). The data provided in this article is drawn from field surveys with reliable reference resources.
Thi Le Anh,Tan Man Minh,Tung Do Hoang,Tam Do Quang,Hoa Nguyen Minh 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.9
A first-principles calculation has investigated the structural, electronic, optical of the CdSe nanocrystal (NC) based on the generalized gradient approximation (GGA) method within the density functional theory. The geometric optimization of the unit cell is in good agreement with our experimental data. The band structure, density of states of the NC were analyzed. The results found that CdSe NC is a direct bandgap with an estimated 1.48 eV. We also report the results of dielectric functions and the refractive index (n) characterized. It is indicated that CdSe materials have excellent photoelectric properties potential applications in optoelectronic devices.
To Tam NGUYEN,Tuan LE-ANH,Thi Xuan Hoa NGUYEN 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.5
This research examines the effects of organizational learning and network involvement, as well as many contextual factors, on power generation businesses’ innovation capability and operational success in Vietnam. This research also aims to attest to the moderating roles of top management support and company age, and firm possession type in the power generation industry. This study applied the exploratory factor analysis (EFA) and PLS-SEM approach for data analysis. In this research, we have tested hypotheses with data collected from 132 top managers and other key personnel from power generation companies in Vietnam. The results also attest to the moderating role of top management support on the two relationships between organizational learning - innovation capability and network involvement - innovation capability. Another important finding is that the company age has a negative impact on operational performance but shows a positive moderating role in the relationship between innovation capability and operational performance. This study highlights the central roles of organizational learning and innovation capability in impacting the organizational performance of power generation companies. These companies play a key role in supporting the development of industries in practice. This research also emphasizes the moderating roles of top management support and company age and possession type in practice.
Tu Anh Do,Mang Tia,Thuan Huu Nguyen,Tuyet Thi Hoang,Tam Duc Tran 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.1
Three-dimensional finite element (FE) thermal and stress models were created to compute the temperature evolution, thermal stress and potential of cracking in a segmental concrete box girder segment during construction. User-defined subroutines were developed in the ANSYS program to activate the degree of hydration-dependent heat rate and material properties, and creep behavior in the thermal and stress calculations. The developed FE model was verified with experimental measurements of a concrete cube. Adiabatic temperature rise, together with compressive strength and splitting tensile strength for a high-strength concrete mix typically used in construction of box girders were tested and incorporated in the subroutines. The effect of casting time and placement season (summer and winter), initial concrete temperature change, and insulation on the risk of cracking in a cast-in-situ box girder segment at early ages was investigated using the proposed model. The results indicate that the temperature difference between the segment’s middle and the gate corner is very large leading to a high cracking risk. Use of an insulation material such as blankets along with casting concrete at the nighttime would significantly lessen the thermal tensile stress and thus could reduce cracking risk in the segment.
Long Nguyen-Ngoc,Tu Anh Do,Viet Hai Hoang,Tuyet Thi Hoang,Tam Duc Tran 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
Engineering infrastructure includes a large number of concrete structures. The main binder used in concrete is Portland cement, which reacts with water when mixing. During the chemical reaction (cement hydration) heat is released causing non-uniform temperature distribution and subsequent internal stresses that may crack the concrete. Therefore, accurate prediction of concrete temperature evolution in design and control of concrete temperature in construction are crucial tasks for engineers. This paper presents the development of a finite difference (FD) model for predicting thermal behavior of concrete structures during cement hydration. A formwork or insulation layer that covers the outer of the concrete was accounted for in the model. The temperature profiles calculated by the proposed model show close agreement with those measured from a concrete bridge footing and a concrete cube. The Particle Swarm Optimization (PSO) algorithm was adopted to compute an “equivalent convection coefficient” for the convection boundary condition in the simplified model for several common insulation materials. The results show that using the simplified model along with an equivalent convection coefficient can give a significant reduction in the computation time while the accuracy is still maintained. In addition, an equation for estimating an equivalent convection coefficient for a given insulation material was developed for design and practical purposes. The proposed method can be used in the design of concrete structures and control of concrete temperature to prevent early-age thermal cracking thus ensuring the expected durability and service life. From the obtained results, varying equivalent convection values are also recommended to be used for different insulation materials.