Papers by Nguyen Trung Nam FX18000
E3S Web of Conferences, 2021
Currently, the research on the application of bamboo wood plastic fibers to 3D printing technolog... more Currently, the research on the application of bamboo wood plastic fibers to 3D printing technology in Vietnam is limited. Almost all studies mainly focus on the application of natural polymers (wood, rubber, coir..) but ignore a rich natural polymer source, popular in Vietnam: bamboo. In addition, the quality of wood plastic fibers applied in 3D printing technology has not responded to the requirements of consumers. The durability of 3D printed parts that is based on wood plastic fibers is not high. Surface gloss of parts after implementation is still rough. During the 3D printing process of wood plastic fibers material, the nozzle is still always clogged due to the blockage of wood pulp. Therefore, the study of technology and equipment for the fabrication of bamboo wood fibers and research on the effect of technological parameters on the finished bamboo-wood-plastic fiber properties is necessary and should be urgently carried out. The paper proposes a new approach to structure modu...
Meeting Abstracts of the Physical Society of Japan (Nihon Butsuri Gakkai koen gaiyoshu), 2009
Sixteen sesquiterpenoids (<b>1 </b>–<b> 16</b>), including two new compou... more Sixteen sesquiterpenoids (<b>1 </b>–<b> 16</b>), including two new compounds namely saussucostusosides A and B (<b>1</b> and <b>2</b>), were isolated from the roots of <i>Saussurea costus</i> by various chromatographic separations. Their structures were elucidated by 1 D and 2 D NMR and HR-QTOF-MS experiments. Among isolated compounds, costunlide (<b>6</b>), 3<i>β</i>-[4-hydroxymethacryloyloxy]-8<i>α</i>-hydroxycostunolide (<b>10</b>) and 11<i>β</i>,13-dihydrozaluzanin C (<b>16</b>) exhibited potent inhibitory effects on LPS-induced NO production in RAW264.7 cells with IC<sub>50</sub> values of 7.08 ± 0.34, 2.40 ± 0.06 and 5.55 ± 0.24 µM, respectively.
E3S Web of Conferences, 2021
Nowadays Single Point Incremental Forming (SPIF) is really a new technology of forming metal shee... more Nowadays Single Point Incremental Forming (SPIF) is really a new technology of forming metal sheet after its formation and long development in about five decades. Although it was invented in, 1967 by Leszak, an American inventor, but the applications of the innovative technology have just been popular from 1990 because of the advance of controlling technology. This technology is especially adapted to small batch, unique or single productions. In almost all cases, the workpiece material sheets are metal such as aluminum alloys, bronze, mild steel, stainless steel and even Titanium with lot of researches, papers and thesis... Nonmetal sheets are rarely applied in this technology because of rare application. Nowadays, on the rise of the development of composite materials such as, PVC, thermoplastic resins... that have been a lot of applications on living life and technology. In this paper, we dedicate all of our work in the examination some parameters of forming that influence on the d...
RSC Advances, 2020
The development of Mg–5Al–4Sn–xSr alloys with α-grain reduction, refined precipitates and pitting... more The development of Mg–5Al–4Sn–xSr alloys with α-grain reduction, refined precipitates and pitting corrosion resistance by die casting.
RSC Advances, 2020
The vascular endothelial growth factor 165 (VEGF165) is a quintessential biomarker in cancers.
TAP CHI SINH HOC, 2020
A total of 257 Decapterus maruadsi individuals of collected from Thuan An estuary in Phu Vang Dis... more A total of 257 Decapterus maruadsi individuals of collected from Thuan An estuary in Phu Vang District, Thua Thien Hue Province were analyzed. Results showed that the fork length ranged from 90 mm to 215 mm (160.2 mm on average) and mainly in the 140–180 mm range (86.8 %). Of three age groups (0+ to 2+), the fished stock belongfrom is primarily to the 1+ age group (63.8%) and 0+ age group (28.8%). Of five stomach fullness levels (0 to 4), the second and fourth degree made up significantly proportions, being 29.6% and 31.5%, respectively. For the five fat levels (0 to 4), the fourth degree made up 86.0%. The females to males ratio was 1.00 : 1.42. von Bertalanffy’s growth model followed the equation: Lt = 203.77 × (1–e-0.3747(t+3.0272)).
VNU Journal of Science: Policy and Management Studies, 2019
Traditional economic development often faces the trade-off between economic growth and environmen... more Traditional economic development often faces the trade-off between economic growth and environmental quality. That is because of the linear approach, which relies on resource exploitation to make products, consumption and then dispose, resulting in natural resource degradation and waste increase. Circular economy is a change approach, towards restoration and regeneration, thereby reducing the dependence on natural resources and limiting emission, while not underestimating economic development. This paper conducts an in-depth analysis of the difference between the linear economy and circular economy. Moreover, it discusses the necessity of the transition from the linear economy to circular economy, which has recently become a trend in many countries around the world.
Natural Product Communications, 2010
A new lignan dimer, bilariciresinol (1), was isolated from the leaves of Mallotus philippensis, a... more A new lignan dimer, bilariciresinol (1), was isolated from the leaves of Mallotus philippensis, along with platanoside (2), isovitexin (3), dihydromyricetin (4), bergenin (5), 4 -O-galloylbergenin (6), and pachysandiol A (7). Their structures were elucidated by spectroscopic experiments including 1D and 2D NMR and FTICR-MS.
Natural Product Communications, 2014
Six secondary metabolites, including two novel iridoids, longifolides A (1) and B (2), were isola... more Six secondary metabolites, including two novel iridoids, longifolides A (1) and B (2), were isolated by various chromatographic methods from a methanol extract of branches and leaves of Morinda longifolia Craib. The structures of the compounds were determined on the basis of NMR spectroscopic (1H and 13C NMR, HSQC, HMBC, 1H-1H COSY, NOESY) and FTICR-MS data, as well as by comparison of them with literature values.
Natural Product Communications, 2014
Sea cucumbers have been used as a dietary delicacy and important ingredient in Asian traditional ... more Sea cucumbers have been used as a dietary delicacy and important ingredient in Asian traditional medicine and functional foods over many centuries. Using combined chromatographic methods, six triterpene saponins (1-6), including a new compound, stichloroside F (1), were isolated from a methanol extract of the sea cucumber Stichopus chloronotus Brandt. Their structures were determined on the basis of spectroscopic (1H and 13C NMR, HSQC, HMBC, 1H-1H COSY, ROESY) and FTICR-MS data and by comparison with literature values.
Natural Product Communications, 2013
Two new butenolide and pentenolide derivatives, dysideolides A-B, were isolated from the marine s... more Two new butenolide and pentenolide derivatives, dysideolides A-B, were isolated from the marine sponge Dysidea cinerea. Their structures were determined by the combination of spectroscopic and chemical methods, including 1D- and 2D-NMR spectroscopy, and CD spectra, as well as by comparing with the NMR data reported in the literature.
Natural Product Communications, 2009
From the methanol extract of Dracaena cambodiana roots two unusual 22S-spirostane steroids (1β,3β... more From the methanol extract of Dracaena cambodiana roots two unusual 22S-spirostane steroids (1β,3β,14α,20R,22S,25R)-spirost-5-ene-1,3, 14-triol (1) and (1β,3β,14α,15α,20R,22S,25R)-spirost-5-ene-tetrol (2) have been isolated, together with a known 22R-spirostane compound, namogenin B (3). Their structures were elucidated by spectroscopic and spectrometric methods, including HRMS and extensive 1D and 2D NMR spectroscopy. Compound 1 showed significant antimicrobial activity against Pseudomonas aeruginosa, Staphylococcus aureus and Fusarium oxysporum, with MIC values of 45.0, 25.0 and 50.0 μg/mL, respectively.
Natural Product Communications, 2009
Phytochemical study of the methanol extract of Mallotus anisopodus led to the isolation of two ne... more Phytochemical study of the methanol extract of Mallotus anisopodus led to the isolation of two new megastigmane sulphonoglucosides, namely anisoposides A (1) and B (2), along with junipetrioloside A (3), bergenin (4), α-tocopherol, and N1-methyl-2-pyridone-5-carboxamide. Their structures were deduced by spectroscopic and spectrometric methods including 1D-, 2D-NMR, ESIMS, and HRESIMS.
Chemical & pharmaceutical bulletin, Jan 21, 2018
Seven anthraquinones including two new compounds namely capillasterquinones A and B (1 and 2) and... more Seven anthraquinones including two new compounds namely capillasterquinones A and B (1 and 2) and one new butenolide namely capillasterolide (8) were isolated and structurally elucidated from the crinoid Capillaster multiradiatus. The inhibitory effect of compounds 1-8 on lipopolysaccharide (LPS)-induced nitric oxide (NO) production as well as inhibition of 1 on expressions of iNOS and COX-2 proteins in RAW264.7 cells were also evaluated. As the obtained results, capillasterquinone A (1) showed strong NO production inhibitory activity with an IC of 5.89 ± 0.11 µM. In addition, compound 1 reduced the LPS-induced inducible nitric oxide synthase (iNOS) and cyclooxygenase 2 (COX-2) expressions in a dose-dependent manner.
Taiwanese Journal of Mathematics, 2006
This paper deals with the classical distance function to closed sets and its extension to the cas... more This paper deals with the classical distance function to closed sets and its extension to the case of set-valued mappings. It has been well recognized that the distance functions play a crucial role in many aspects of variational analysis, optimization, and their applications. One of the most remarkable properties of even the classical distance function is its intrinsic nonsmoothness, which requires the usage of generalized differential constructions for its study and applications. In this paper we present new results in theser directions using mostly the generalized differential constructions introduced earlier by the first author, as well as their recent modifications. We pay the main attention to studying subgradients of the distance functions in out-of-set points, which is essentially more involved in comparison with the inset case. Most of the results obtained are new in both finite-dimensional and infinite-dimensional settings; some of them of provide essential improvements of known results even for convex sets.
Vietnam Social Sciences, 2002
The Thai Journal of Veterinary Medicine, Dec 15, 2014
The present study was to investigate the effects of low intensity laser therapy (LILT) on the hea... more The present study was to investigate the effects of low intensity laser therapy (LILT) on the healing of rabbit tibial defects. Circular defects were perforated at the medial site of tibial crests on both hind legs of 18 male New Zealand White rabbits. The defects were randomly allocated into 3 groups (n=12): 1) defects irradiated with LILT, at 4 J/cm 2 (LS4); 2) defects irradiated with LILT, at 20 J/cm 2 (LS20), and 3) defects receiving sham treatment (control group). Irradiation began 24 h after surgery, and repeated every 48 h, with a total of 8 sessions. In the 3 rd and 6 th weeks after surgery, the rabbits were euthanized, and the healing of defects was assessed by cone beam computed tomography, qualitative and quantitative histological techniques. Results showed that the 2 dosages of LILT similarly and significantly enhanced bone healing by increasing the bone area fraction in the 3 rd week and the density of newly formed bone tissues in the 6 th week after surgery. In conclusion, our findings support the hypothesis that LILT could improve the healing of the rabbit tibial defects via increased bone formation. The equal positive effects of the 2 settings suggest that the lower dosage of LILT may be more preferable and practical than the higher one in bio-stimulation of healing of bone fractures/defects.
Nmec 2012 Proceedings of the First International Workshop on Nano Materials For Energy Conversion and Fuel Cell, 2012
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Papers by Nguyen Trung Nam FX18000