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Van Vang Le,Anh Tuan Hoang,Xuan Duong Pham,Van Viet Pham 국제이네비해양경제학회 2018 International Journal of e-Navigation and Maritime Vol.9 No.1
In recent years, much interest has been devoted to bio-fuels because of their beneficial effects on environment, agriculture and economic development. Raw vegetable oil – a kind of bio-fuels, still exits many downsides, is potential renewable fuel replaced for ever-exhausted fossil fuel. In this report, vegetable oil which is available in the South of Vietnam such as raw coconut oil is studied by heating up different temperature with the aim at decreasing its high viscosity and density and meeting the fuel requirements. The experiments are conducted on heated coconut oil (HCO) and fossil diesel oil (DO) using an 80hp of small marine diesel engine. The results of engine performance as using DO and HCO included engine power (Ne), specific fuel consumption (SFC), thermal efficiency (TE), emission characteristics such as carbon monoxide (CO), unburned hydrocarbon (HC), smoke, nitrogen oxides (NOx) at internal feature are measured. The experiment results show higher SFC, CO, HC and smoke emissions, and lower TE, and NOx emissions for HCO with respect to DO. In addition, this study also reveals that, 1000C of HCO is said to be the most suitable heating temperature as getting the engine performance equals to DO.
New Dibenzocyclooctadiene Lignan from Kadsura induta and Their Cytotoxic Activities
Pham, Thi Hong Minh,Do, Tien Lam,Nguyen, Quyet Tien,Nguyen, Ngoc Tuan,Vu, Phuong Nhung,Nong, Van Hai,Phan, Van Kiem,Nguyen, Xuan Nhiem,Chau, Van Minh,Park, SeonJu,Kim, Seung Hyun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
Dinh Van Tuan,Dang Thi Thuy Ngan,Dao Vu Phuong Thao,Nguyen Thi Nguyet,Nguyen Thi Thuy,Nguyen Phuong Thuy,Vu Van Thu,Vuong-Pham Hung,Phuong Dinh Tam 한국물리학회 2022 Current Applied Physics Vol.43 No.-
A facile hydrothermal route was used to synthesize silver nanoparticle (AgNP)-decorated microflower molybdenum disulfide (MoS2-MF) for bio-electrochemical platform fabrication to detect nonenzymatic glucose concentration. The morphologies of the materials were studied by scanning electron microscopy, and their structural characteristics were analyzed by X-ray diffractometry and energy-dispersive X-ray spectroscopy. The electrochemical characteristics of the AgNPs/MoS2-MF/PtE biosensor were studied by cyclic voltammetry. The obtained data indicated that the developed nonenzymatic glucose sensor has a large linear response between 1.0 and 15.0 mM, a limit of detection of as low as 1.0 mM, and a sensitivity of 46.5 μA nM-1 cm-2. The biosensor also displayed outstanding selectivity, stability, reproducibility, and repeatability. Additionally, the AgNPs/MoS2-MF/ PtE biosensor was utilized to detect glucose concentration in real sample and showed practical application potential for glucose detection.
Effect of nanostructured MoS2 morphology on the glucose sensing of electrochemical biosensors
Dinh Van Tuan,Dang Thi Thuy Ngan,Nguyen Thi Thuy,Hoang Lan,Nguyen Thi Nguyet,Vu Van Thu,Vuong-Pham Hung,Phuong Dinh Tam 한국물리학회 2020 Current Applied Physics Vol.20 No.9
In this study, the effects of the morphological characteristics of MoS2 nanomaterials on the glucose sensing of electrochemical biosensors were explored. Nanostructured MoS2 materials, including nanoparticles (NPs), nanoflowers (NFs), and nanoplatelets (NPLs), were prepared via a simple hydrothermal method. The structure and morphological characteristics of MoS2 nanomaterials were examined through X-ray diffraction, field emission scanning electron microscopy, and Raman spectroscopy. Electrochemical properties were analyzed through cyclic voltammetry. Results showed that the obtained sensitivity was 64, 68.7, and 77.6 μAmM 1 cm 2 for MoS2 NP-, MoS2 NF-, and MoS2 NPL-based biosensors, respectively. The limit of detection (LOD) of all MoS2-based glucose biosensors was 0.081 mM. In addition, the pH, temperature, glucose oxidase (GOx) concentration, reproducibility, specificity, and stability of glucose biosensors with different MoS2 morphologies were also investigated and indicated the oxidation current response of the MoS2 NPL-based glucose biosensor was higher than that of MoS2 NF- and NP-based biosensors.
( Luan Pham Van ),( Tien Nguyen Dinh ),( Ha Le Ngoc ),( Son Mai Hong ),( Bieu Bui Quang ),( Tuan Nguyen Van ) 대한결핵 및 호흡기학회 2021 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.129 No.-
Objective Stereotactic Body Radiation Therapy (SBRT) was indicated for early-stage non-small cell lung cancer (NSCLC) patients inoperable. The purpose of the study was evaluated the result of SBRT in stage I NSCLC patients (T1-2aN0M0) with peripheral tumors. Methods Prospective, follow-up 23 patients with stage T1-2aN0M0 NSCLC with peripheral tumor, who were received SBRT, followup and evaluated from January, 2015 to January, 2020. The primary endpoints were Objective Response Rate (ORR), Disease Control Rate (DCR), Progression Free Survival (PFS), the second endpoints were Overall Survival (OS) and Toxicity. Results The average age was 65.13 years-old, the mean of diameter was 3.31cm, the mean of SUVmax value was 7.77. The stage of the tumor is mostly T2a (60,9%). The median of follow-up was 26 months, ORR was 91.3%, DCR was 95.7%. The median PFS was 26 months, median OS was 58 months, the ratio of OS in 1 year, 2 years, 3 years, 4 years, 5 years were 95.7%, 65.2%, 39.1%, 26.1% and 17.4%, respectively. The common of adverse events was pneumonitis due to SBRT at 9 patients, but mainly was grade 1, no patients have pneumonitis grade 4 and 5. No clinically significant changes in pulmonary function following SBRT for earlystage NSCLC. Conclusion SBRT was a good option for patients with stage I NSCLC, there was no significant difference in survival between patients who refused surgery and those who have medical inoperable and this is a safe treatment for patients.
Chemical components from the leaves of Ardisia insularis and their cytotoxic activity
Nguyen Thi Hong Van,김승현,Trinh Anh Vien,Phan Van Kiem,Chau Van Minh,Nguyen Xuan Nhiem,Pham Quoc Long,Luu Tuan Anh,김난영,박선주 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.11
One new oleanane triterpene glycoside, ardinsuloside(1), and twelve known compounds, demethoxybergenin(2), norbergenin (3), bergenin (4), 4-O-galloylbergenin(5), quercitrin (6), myricitrin (7), myricetin 3-O-(300-O-galloyl)-a-L-rhamnopyranoside (8), desmanthine-2 (9), epicatechin3-O-galloyl ester (10), 30-methoxyepicatechin 3-Ogalloylester (11), gallic acid (12), and methyl galloate (13)were isolated from the leaves of Ardisia insularis. Theirstructures were established on the basis of spectral and chemicalevidence, which were in agreement with those reportedin literature. The cytotoxic activities of these compounds wereevaluated on three cancer cell lines namely A-549 (humanlung cancer), HT-29 (Human colon adenocarcinoma), andOVCAR (human ovarian carcinoma). The results revealedthat compound 1 inhibited A-549, HT-29, and OVCAR celllines with IC50 values of 8.5 ± 1.2, 16.4 ± 3.1, and13.6 ± 2.4 lM, respectively. The remaining compoundshowed weak cytotoxic activity. This result indicated thatcompound 1 could be useful in the treatment of cancer disease.
Hai Le Xuan,Quoc-Dong Hoang,Soon Geul Lee,Dat Pham Xuan,Hoang Tran Viet,Minh Pham Van,Hung Pham Van,Hung Pham Viet,PHAM DUC TUAN,Duc Anh Nguyen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
Ballbots, which have been studied for over ten years, are under-actuated mobile robots that operate using the inverted pendulum paradigm. Controlling a ballbot poses a number of challenges, including maintaining the stable upright posture from the ground in all directions and making sure it follows the desired trajectory. External factors such as a minor change in contact surface properties or fabrication errors can affect the system's stabilization and transfer capabilities. In this study, an adaptive hierarchical sliding mode control algorithm based on an artificial neural network is developed to make the ballbot robust to external factors. The use of the proposed controller ensures system stability despite uncertainties including friction, accidental centrifugal forces and gravity that occur when the ballbot follows the reference trajectory. The system stability is guaranteed on the basis of Lyapunov theory. Control efficiency and robot stability under system uncertainties are demonstrated by numerical simulation.
Pham Van-Su,Le Minh-Tuan,Mai Linh,Yoon Gi-Wan The Korea Institute of Information and Commucation 2006 Journal of information and communication convergen Vol.4 No.2
This work presents a low complexity maximum-likelihood decoder for signal detection in VBLAST-STBC system, which employs non-square O-STBC code rate 3/4. Stacking received symbols from different symbol duration and applying QR decomposition result in the special format of upper triangular matrix R so that the proposed decoder is able to provide not only ML-like BER performance but also very low computational load. The low computational load and ML-like BER performance properties of the proposed decoder are verified by computer simulations.