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Han, N.,Park, Y. J.,Han, M.,Ryu, B. D.,Ko, K. B.,Chandramohan, S.,Choi, C. J.,Cuong, T. V.,Hong, C. H. Elsevier Science B.V., Amsterdam. 2014 Materials letters Vol.123 No.-
dramatic reduction in threading dislocation density and stress-relaxation was simultaneously achieved in GaN epilayer using a silica nanosphere embedded structure on V-groove patterned sapphire substrate by metal-organic chemical vapor deposition. By depositing silica nanospheres at two different instances during a growth process, a two-step growth that included selective area growth and lateral overgrowth was initiated. This approach led to GaN template of high crystal quality, which was confirmed from x-ray diffraction rocking curve and micro-Raman measurements and further corroborated by transmission electron microscopy. GaN light-emitting diode fabricated by this strategy showed a significant enhancement in the light output power. (C) 2014 Elsevier B.V. All rights reserved.
Effect of copper oxide on the resistive switching responses of graphene oxide film
Yoo, D.H.,Cuong, T.V.,Hahn, S.H. Elsevier 2014 CURRENT APPLIED PHYSICS Vol.14 No.9
The role of CuO films in meliorating resistive switching behavior of graphene oxide (GO) in CuO/GO/CuO memory structure was investigated. An increase in the set voltage from 1.3 to 3.0 V and a step-like switching current was clearly observed when the GO film was sandwiched between two CuO layers. It is attributed to the fact that the set voltage of GO is lower than that of CuO and accumulated charge carriers located at the interface of GO and CuO can pass through CuO abruptly at set voltage of 3.0 V. Our results suggested that designed sandwich structure of materials with different set voltage enables to amend resistive switching response characteristics.
T. V. Cuong,C. S. Park,홍창희,서은경,H. K. Cho,J. Y. Park 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
In order to investigate the effect of Ga source on nitrogen incorporation, GaAsN and Ga(In)AsN/GaAs quantum wells were grown by metalorganic chemical vapor deposition (MOCVD) using triethylgallium (TEG) and trimethylgallium (TMG) as a Ga source. Nitrogen composition increases with decreasing growth temperature and increasing dimethylhydrazine (DMHy) molar flow rate. Also, use of TEG shows better incorporation of nitrogen, compared to use of TMG. This result can be explained by calculating and comparing a relative distribution coefficient of As over N (C value). Moreover, it can be seen that use of TEG improves the crystal quality of the GaAsN/GaAs quantum well.
Deformation of a compound droplet in a wavy constricted channel
Hung V. Vu,Truong V. Vu,Binh D. Pham,Hoe D. Nguyen,Vinh T. Nguyen,Hoa T. Phan,Cuong T. Nguyen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.1
Controlling and adjusting the size and shape of compound droplets is of increasing interest in manufacturing applications using microfluidic channels of complicated geometry. Using numerical simulation in the evolution of computer science with the ability to expand the scope of research and optimize costs is a current research trend. We here provide a numerical simulation analysis of the dynamics of a compound droplet travelling in a circular and sinusoidal-wave tube. The simulations were performed with variations of the Reynolds number, capillary number, droplet size, and channel geometry. It follows that the capillary number strongly impacts the dynamics of the droplet, and the alternation of breakup and finite deformation modes. The deformation increases and the droplet is stretched along the centerline of the channel as the Reynolds number increases. Increasing the length of the wavy region makes the droplet more deformed and enhance its breakup. Regime diagrams based on some of these parameters are also plotted.
Khanh, P.N.,Duc, H.V.,Huong, T.T.,Son, N.T.,Ha, V.T.,Van, D.T.,Tai, B.H.,Kim, J.E.,Jo, A.R.,Kim, Y.H.,Cuong, N.M. Elsevier 2016 Fitoterapia Vol.109 No.-
<P>Phytochemical analysis of the leaves and stems of Callistemon citrinus (Curtis) Skeels led to the isolation of two new alkylphloroglucinols, gallomyrtucommulone E and F (1 and 2), along with four other known alkylphloroglucinol derivatives, gallomyrtucommulone A (3), endoperoxide G3 (4), myrtucommulone B (5), callistenone B (6) and five known triterpenoids, induding betulinic acid (7), 3 beta-acetylmorolic acid (8), 3 beta-hydroxy-urs-11-en-13(28)olide (9), diospyrolide (10) and ursolic acid (11). The structures of the natural compounds were determined from the spectroscopic evidences including 1D-/2D-NMR and HR-MS spectrometry. All the isolated compounds were assessed for the effects on the sEH inhibitory activity. The acylphloroglucinols myrtucommulone B (5)/callistenone B (6) (in mixture), and two triterpenoids, ursolic acid (11) and 3 beta-hydroxy-urs-11-en-13(28)-olide (9) displayed strong inhibition of sEH activity, with IC50 values of 0.7, 112 and 24.8 mu M, respectively. (C) 2015 Elsevier B.V. All rights reserved.</P>
T. S. Kim,C- H. Hong,C. S. Park,E-K. Suh,H. J. Lee,J. Y. Park,T. V. Cuong 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.51
The photocurrent and the photoluminescence were studied for the In0:2Ga0:8As0:98N0:02/GaAs strained multi-quantum-wells (MQWs) structure grown by using metalorganic chemical vapor deposition. The structural properties of the InGaAsN/GaAs strained MQWs were investigated using high-resolution X-ray diraction (HRXRD). For In0:2Ga0:8As0:98N0:02/GaAs strained MQWs, the peaks observed in the photocurrent and the photoluminescence spectra were preliminarily assigned to electron-heavy hole (e1-hh) and electron-light hole (e1-lh) fundamental excitionic transitions. Two additional transitions related to the MQWs region were observed in the photocurrent spectra other then transitions involving the ground state.
Numerical study of the indentation formation of a compound droplet in a constriction
Hoe D. Nguyen,Truong V. Vu,Phan H. Nguyen,Binh D. Pham,Nang X. Ho,Cuong T. Nguyen,Vinh T. Nguyen 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4
A compound droplet deforming in a constricted tube widely appears in drug delivery and microfluidic devices. In such a constriction, an indentation can present at the trailing surface of the droplet. However, this aspect has not been fully investigated and understood so far. This study focuses on the effects of some dimensionless parameters on the negative curvature, i.e., indentation, at the trailing surface of a compound droplet moving through a constricted tube. The presence of the constriction at the middle of the tube length enhances the droplet indentation. Numerical results were obtained for the capillary number Ca (varied in range of 0.1 - 1.0), the inner-to-outer droplet radius ratio R 21 (varied in range of 0.2 - 0.9), the droplet-to-tube radius ratio R 10 (varied in range of 0.2 - 0.9), the inner-to-outer interfacial tension coefficient ratio σ 21 (varied in range of 0.1 - 6.4), and the normalized depth of the constriction d/R (varied in range of 0.0 - 0.8). The results reveal that the most influencing factor is Ca, increasing its value leads to the increment of the maximum indentation at the trailing surface of the inner and outer droplets. The indentation is also increased with increasing the value of R 10and d/R. In contrast, increasing R 21 results in a decrease in the indentation at the trailing surface of the outer droplet. When increasing σ 21 , the indentation at the trailing surface of the inner one is quickly suppressed, while the outer droplet is minorly affected. We also point out the patterns of the trailing surface of the inner and outer droplets and their transitions from one to the other patterns in the diagrams based on these parameters.