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Two new species of Camellia (Theaceae) from Vietnam
Lieu Thi Nguyen,Ninh Tran,Uematsu CHIYOMI,Katayama HIRONORI,Dung Van Luong,Son Thanh Hoang,Ky Danh NGUYEN,Hung Viet NGUYEN,Toan Canh THAI 한국식물분류학회 2018 식물 분류학회지 Vol.48 No.2
Two new species of Camellia (Theaceae) are described from Vietnam: Camellia vuquangensis Luong, Tran & L. T. Nguyen and Camellia hatinhensis Luong, Tran & L. T. Nguyen. The new taxa were col- lected from Vu Quang National Park in the center of Vietnam. The new finds are morphologically dissimilar to all known Camellia species. Recent Camellia discoveries have increased the number of species recorded in Viet- nam from 50 to 75, making Vietnam a center of diversity and a crucial area for more research into the diversity and distributions of Camellia.
[ICACE2022] Model identification of two double-acting pistons pump
Danh Khoa Nguyen,Cong Toai Truong,Van Tu Duong,Huy Hung Nguyen,Tan Tien Nguyen 한국마린엔지니어링학회 2023 한국마린엔지니어링학회지 Vol.47 No.2
The Covid-19 pandemic has had a comprehensive and far-reaching impact on various fields, especially in the medical aspect. Additionally, many variants of this coronavirus have appeared due to mutation, each of which has distinguished influences. During the Covid-19 pandemic, medical equipment, especially ventilators, has seen a severe shortage. Thus, many studies of ventilators machine have been carried out around the world. And according to these studies, airflow control is one of the critical issues of ventilator machine research that saves human life. Understanding the above problem, it is necessary to conduct system modeling and obtain a model which has high linearity so that the parameters of the ventilation can be controlled to achieve better accuracy. This paper presents the model identification of a two double-acting piston pump system using experimental data. First order plus dead time method is applied to achieve the identification model. The data used for identification and validation are collected by conducting several practical tests on the two double-acting pistons pump system. The discussion on the identified model and future works are also included in this paper.
Le, Thi Thao Nguyen,Ly, Nguyen Hoang,Nguyen, Thanh Danh,Nguyen, Thi Ha,Kim, Moon-Kyung,Zoh, Kyung-Duk,Joo, Sang-Woo Elsevier 2018 Colloids and surfaces. A, Physicochemical and engi Vol.551 No.-
<P><B>Abstract</B></P> <P>For this report, we compared interfacial spectroscopic tools to monitor in situ Fenton reactions of organic dyes on ascorbic acid-reduced gold nanostars (AuNSs). Ultraviolet-visible (UV–vis) absorption and Raman spectroscopic tools were introduced to check the hydroxyl radical destruction of ethyl violet (EV), which contains a triarylmethane group. AuNSs with sharp edges, tips, and corners were used as efficient surface-enhanced resonance Raman scattering (SERRS) substrates for in situ Fenton reaction monitoring. The SERRS intensity of the EV showed a first-order decay curve with a reaction rate constant value of 0.0263 min<SUP>−1</SUP>, while the decolorization yielded second-order kinetic behavior with a constant value of 0.00430 L/mol min. In addition to the destruction of the organic dyes, the increased number of ferric (III) ions, as a result of the Fenton reactions, was detected via 4-aminobenzo-15-crown-5 (4AB15C5) conjugated with 4-mercaptobenzoic acid (4MBA). We found that the SERRS bands at ∼1500 cm<SUP>−1</SUP> of 4AB15C5 on AuNSs increased after treatment with H<SUB>2</SUB>O<SUB>2</SUB> and FeSO<SUB>4</SUB>. Real industrial textile wastewater samples were then tested to determine whether this Raman method could be applied to detect increases in ferric ions. Our spectroscopic data used SERRS peaks via Fenton reaction results to calculate an estimated ∼65% destruction of the organic dyes.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Microwave Power Transmission Using a Sequential Phase Ring Transmitting Antenna
Danh Manh Nguyen(응웬단만),Chulhun Seo(서철헌) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
This paper presents a sequential transmitting antenna (Tx) for microwave power transmission (MPT) system. The design concept consists of an array of four patch element fed by a sequential phase rotation (SPR) ring with a compact size and LHCP maximum gain of 11.98 dBi at 5.8 GHz. To verify the system charging ability while on the move, alternate rotation and displacement coordinate case are performed.