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Phuc Nguyen Thien,Giang Nguyen Thi Huong,An Vu Nguyen Thien Truong,Nam Nguyen Thanh Hoai,Anh Ly Duc,Nguyen Huynh Cam,An Hoang,Phong Mai Thanh,Hieu Nguyen Huu 한국탄소학회 2023 Carbon Letters Vol.33 No.2
In this study, graphene oxide (GO) was synthesized by the improved Hummers’ method. The degree of oxidation from graphite (Gi) to GO was determined through interlayer spacing calculated from X–ray diffraction. Besides, the effect of KMnO4:Gi ratios (X1), H2SO4 volume (X2), oxidation temperature (X3), oxidation time of stage 1 (X4), and oxidation time of stage 2 (X5) was screened by the Plackett–Burman model. The simultaneous impact of three factors that influenced the degree of oxidation (X1, X2, and X3) was studied by the Box–Behnken experimental model of response surface methodology to achieve suitable conditions for the GO synthesis process. The characterization of GO product was investigated via the modern analytical methods: X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, UV–Vis spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. In addition, the study was also carried out on a pilot scale for orientation in industrial application with the yield of 14 g/batch.
Trong Luan NGUYEN,Nguyen Anh Ngu PHAM,Thi Kim Nhung NGUYEN,Ngoc Khai Vy NGUYEN,Hoang Thang NGO,Tran Thien Ly PHAM 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.2
At present, environmental problems are gradually becoming quite serious because of the expansion of the business scale of companies, factories, and enterprises, and that is also the reason for the global pollution of the world. Green entrepreneurship is playing an increasingly crucial role in influencing people’s intentions, behaviors, and attitudes toward environmental protection through sustainable development. The purpose of this research was to examine the factors affecting university students’ green entrepreneurship levels in Vietnam. To do this, we performed a scientific research survey with 773 students from reputable universities in Vietnam, 337 of whom are male and 436 of whom are female. To assess the reliability and correlation between observed and total variables, this study employs scale testing methods such as Cronbach alpha, EFA, CFA, and SEM. After evaluating the influencing elements, the findings reveal that the Subjective norm factor and the Risk-aversion component are two distinct aspects that influence university students’ green entrepreneurship intentions in Vietnam and of which, the greatest influence is Risk Aversion. Furthermore, the findings revealed that the level of interest in green entrepreneurship is mostly seen by students with university education between the ages of 18–25.
Nguyen, Dan Thien,Nguyen, Cao Cuong,Kim, Jong-Seon,Kim, Je Young,Song, Seung-Wan American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.21
<P>We present the first report on carbon fiber-interwoven amorphous nano-SiO<SUB><I>x</I></SUB>/graphene prepared by a simple and facile room temperature synthesis of amorphous SiO<SUB><I>x</I></SUB> nanoparticles using silica, followed by their homogeneous dispersion with graphene nanosheets and carbon fibers in room temperature aqueous solution. Transmission and scanning electron microscopic imaging reveal that amorphous SiO<SUB><I>x</I></SUB> primary nanoparticles are 20–30 nm in diameter and carbon fibers are interwoven throughout the secondary particles of 200–300 nm, connecting SiO<SUB><I>x</I></SUB> nanoparticles and graphene nanosheets. Carbon fiber-interwoven nano-SiO<SUB>0.37</SUB>/graphene electrode exhibits impressive cycling performance and rate-capability up to 5C when evaluated as a rechargeable lithium battery anode, delivering discharge capacities of 1579–1263 mAhg<SUP>–1</SUP> at the C/5 rate with capacity retention of 80% and Coulombic efficiencies of 99% over 50 cycles, and nearly sustained microstructure. The cycling performance is attributed to synergetic effects of amorphous nano-SiO<SUB><I>x</I></SUB>, strain-tolerant robust microstructure with maintained particle connectivity and enhanced electrical conductivity.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-21/am4034763/production/images/medium/am-2013-034763_0010.gif'></P>
Nguyen, Thien Truong Giang,Wanapat, Metha,Phesatcha, Kampanat,Kang, Sungchhang Asian Australasian Association of Animal Productio 2017 Animal Bioscience Vol.30 No.2
Objective: Leucaena leucocephala (Leucaena) is a perennial tropical legume that can be directly grazed or harvested and offered to ruminants as hay, silage, or fresh. However, Leucaena contain phenolic compounds, which are considered anti-nutritional factors as these may reduce intake, digestibility and thus animal performance. Therefore, the objective of this experiment was to determine effects of Leucaena silage (LS) feeding levels on rumen microbial populations, N-balance and microbial protein synthesis in dairy steers. Methods: Four, rumen fistulated dairy steers with initial weight of $167{\pm}12kg$ were randomly assigned to receive dietary treatments according to a $4{\times}4$ Latin square design. Treatments were as followings: T1 = untreated rice straw (RS; Control), T2 = 70% RS+30% LS, T3 = 40% RS+60% LS, and T4 = 100% LS. Dairy steers were fed rice straw and LS ad libitum and supplemented with concentrate at 0.2% of body weight/d. Results: Results revealed that the rumen microbial population, especially cellulolytic, proteolytic bacteria and fungal zoospores were enhanced in steers that received 60% of LS (p<0.05), whereas the amylolytic bacteria population was not affected by treatments (p>0.05). Protozoal population was linearly decreased with increasing level of LS (p<0.05). Moreover, N-balance and microbial protein synthesis were enhanced by LS feeding (p<0.05) and were the highest in 60% LS group. Conclusion: Based on this study, it could be concluded that replacement of RS with 60% LS significantly improved microbial population and microbial protein synthesis in diary steers.
Electrically Assisted Bake Hardening of Complex Phase Ultra-High Strength Steels
Nguyen Trung Thien,홍성태,김문조,한흥남,양대호,이현우,이규영 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.2
In the present study, the feasibility of electrically assisted (EA) bake hardening for a complex phase (CP) ultra-high strength steel (UHSS) is experimentally investigated. In EA bake hardening, a specimen is rapidly heated to a target temperature by resistance heating in 0.25 sec and is cooled in air to room temperature without being held at the elevated temperature. Even with the extremely short process time, the EA bake hardening effectively induced hardening effects on the given UHSS, which are comparable to those of conventional bake hardening with holding time of 25 min. The result of the present study suggests that the EA bake hardening may be used as a cost-effective alternative to a conventional bake hardening process by significantly reducing the process time and the required energy.
Nguyen, Thien Binh,Jang, Bongsoo De Gruyter 2017 Fractional calculus & applied analysis Vol.20 No.2
<P><B>Abstract</B></P><P>An accurate and efficient new class of predictor-corrector schemes are proposed for solving nonlinear differential equations of fractional order. By introducing a new prediction method which is explicit and of the same accuracy order as that of the correction stage, the new schemes achieve a uniform accuracy order regardless of the values of fractional order<I>α</I>. In cases of 0 <<I>α</I>≤ 1, the new schemes significantly improve the numerical accuracy comparing with other predictor-corrector methods whose accuracy depends on a. Furthermore, by computing the memory term just once for both the prediction and correction stages, the new schemes reduce the computational cost of the so-called memory effect, which make numerical schemes for fractional differential equations expensive in general. Both 2nd-order scheme with linear interpolation and the high-order 3rd-order one with quadratic interpolation are developed and show their advantages over other comparing schemes via various numerical tests.</P>
Cytotoxic Activity of Parthenin, a Sesquiterpene Isolated from a Crinum ensifolium
Nguyen Minh Khoi,Nguyen Tien Dat,나민균,Phuong Thien Thuong,민병선,배기환 한국생약학회 2011 Natural Product Sciences Vol.17 No.2
Phytochemical study on the ethanol extract of a Crinum species by bioassay-guided fractionation resulted in the isolation of an active principle, which was determined as parthenin (1) on the basis of physicochemical and spectroscopic analyses. This is the first report on the existence of a sesquiterpenoid from Crinum ensifolium. Compound 1 was found to show strong cytotoxic activity against some cancer cell lines and strongly inhibit NF-kB activity with the IC50 value of 1.82 mM.
Magnesium stannide as a high-capacity anode for magnesium-ion batteries
Nguyen, Dan-Thien,Song, Seung-Wan Elsevier 2017 Journal of Power Sources Vol.368 No.-
<P><B>Abstract</B></P> <P>Driven by the limited global resources of lithium, magnesium metal batteries are considered as potential energy storage systems. The battery chemistry of magnesium metal anode, however, limits the selection of electrolytes, cathode materials and working temperature, making the realization of magnesium metal batteries complicated. Herein, we report the development of a new magnesium-insertion anode, magnesium stannide (Mg<SUB>2</SUB>Sn), and demonstrate reversible electrochemical Mg<SUP>2+</SUP>-extraction and insertion of Mg<SUB>2</SUB>Sn anode at 0.2 V <I>versus</I> Mg, delivering discharge capacity of 270 mAhg<SUP>−1</SUP> in a half-cell with the electrolyte of PhMgCl/THF and enabling of room temperature magnesium-ion batteries with Mg<SUB>2</SUB>Sn anode combined with Mg-free oxide cathode and conventional-type electrolyte of Mg(TFSI)<SUB>2</SUB>/diglyme. The combination of Mg<SUB>2</SUB>Sn anode with various cathodes and electrolytes holds great promise for enabling room temperature magnesium-ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mg<SUB>2</SUB>Sn, a high-capacity anode material showing Mg<SUP>2+</SUP>-insertion and extraction at 0.2 V. </LI> <LI> Synthesis of microsized bulk Mg<SUB>2</SUB>Sn anode material using a simple ball-milling. </LI> <LI> Stable cycling performance of coin half-cell, delivering discharge capacity 270 mAhg<SUP>-1</SUP>. </LI> <LI> Studies of interfacial reaction behavior of half-cell Mg<SUB>2</SUB>Sn anode by XPS analysis. </LI> <LI> Initial cyclability of RT Mg-ion battery, Mg<SUB>2</SUB>Sn//V<SUB>2</SUB>O<SUB>5</SUB>, in conventional electrolyte. </LI> </UL> </P>