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Yen, Nguyen Hai,Thanh, Pham Thi,Koledov, Victor V.,Kamantsev, Alexander P.,Mashirov, Alexey V.,Thanh, Tran Dang,Hau, Kieu Xuan,Yu, Seong Cho,Dan, Nguyen Huy IEEE 2018 IEEE transactions on magnetics Vol.54 No.6
<P>In this paper, we investigated the influence of annealing conditions on magnetic properties, magnetocaloric effect, and critical parameters of Ni<SUB>50</SUB>Mn<SUB>50−<I>x</I></SUB>Sn<SUB><I>x</I></SUB> ( <TEX>$x = 13$</TEX>, 13.5, and 14) alloy ribbons prepared by using the melt-spinning method. The ribbons were annealed at 1123 K for various times. A martensitic–austenitic (M–A) structural phase transformation was observed on both the as-quenched and annealed samples. Temperature of the M–A phase transition ( <TEX>$T_{M-A}$</TEX>) of the ribbons can be regulated in room temperature region by changing the annealing time. Maximum positive and negative magnetic entropy changes, <TEX>$\vert \Delta S_{m}\vert _{\mathrm {max}}$</TEX>, larger than 3 and 1 <TEX>$\text {J}\cdot \text {kg}^{-1}\cdot \text {K}^{-1}$</TEX>, respectively, were achieved on the Ni<SUB>50</SUB>Mn<SUB>37</SUB>Sn<SUB>13</SUB> sample after annealing for 0.5 h. Critical parameters were determined to elucidate magnetic orders in the alloy. The obtained parameters are very close to those of the mean field theory of long-range ferromagnetic orders.</P>
Huy G. Nguyen,Khanh B. Lieu,Thao P. Ho-Le,Lan T. Ho-Pham,Tuan V. Nguyen 대한골다공증학회 2021 Osteoporosis and Sarcopenia Vol.7 No.1
Objectives: Calcaneal quantitative ultrasound measurement (QUS) has been considered an alternative to dual-energy X-ray absorptiometry (DXA) based bone mineral density (BMD) for assessing bone health. This study sought to examine the utility of QUS as an osteoporosis screening tool by evaluating the correlation between QUS and DXA. Methods: The study was a part of the Vietnam Osteoporosis Study that involved 1270 women and 773 men aged 18 years and older. BMD at the femoral neck, total hip and lumbar spine was measured using DXA. Osteoporosis was diagnosed based on the femoral neck T-score using World Health Organization criteria. Broadband ultrasound attenuation (BUA) at the calcaneus was measured by QUS. The concordance between BUA and BMD was analyzed by the linear regression model. Results: In all individuals, BUA modestly correlated with femoral neck BMD (r ¼ 0.35; P < 0.0001) and lumbar spine BMD (r ¼ 0.34; P < 0.0001) in both men and women. In individuals aged 50 years and older, approximately 16% (n ¼ 92/575) of women and 3.2% (n ¼ 10/314) of men were diagnosed to have osteoporosis. Only 0.9% (n ¼ 5/575) women and 1.0% (n ¼ 3/314) men were classified as “Low BUA”. The kappa coefficient of concordance between BMD and BUA classification was 0.09 (95% CI, 0.04 to 0.15) for women and 0.12 (95% CI, 0.03 to 0.22) for men. Conclusions: In this population-based study, QUS BUA modestly correlated with DXA BMD, suggesting that BUA is not a reliable method for screening of osteoporosis
Lan P. T. Huynh,Huy A. Nguyen,Huy Q. Nguyen,Loc K. H. Phan,Thanh T. Tran 한국정밀공학회 2019 한국정밀공학회지 Vol.36 No.8
This study investigated the effects of process parameters on mechanical properties of fabricated parts of the Polylactic acid (PLA) materials using fused deposition modeling (FDM) in 3D printing Technology. First, Taguchi method in the design of experiment (DOE) approach was applied to generate a design matrix of three process parameters namely; printing speed, extrusion temperature and layer thickness. A L9 array with 9 specimens was used for fabrication under various process parameters by the Builder 3D printer. Tensile test was implemented and recorded in accordance with ASTM D368 standard. Achieved data were analyzed using the Minitab software to show the effect of each process parameter on mechanical properties. Secondly, a regression model was developed to predict the trend of response in case of change in setting of parameters and estimating the optimal set of process parameters which creates the strongest FDM parts. The achieved optimum parameters were used to validate the fabricated samples for tensile testing. According to the results, the best mechanical strength of fabricated parts was achieved with printing speed of 48 mm/s, extrusion temperature of 220 degree of celsius (C) and the layer thickness of 0.15 mm. Also, the extrusion temperature was the most influencing factor on ultimate tensile stress.
Van-Anh Nguyen,Huy L. Nguyen,Dzung T. Nguyen,Quan P. Do,Lam D. Tran 한국물리학회 2017 Current Applied Physics Vol.17 No.11
In this paper, an electrosynthesized bilayer film of polypyrrole nanowire and poly(1,5- diaminonaphthalene) on a disposable screen-printing carbon ink electrode is presented. The inner polypyrrole nanowire layer had a large surface-to-volume ratio and high conductivity in the neutral medium, whereas the outer layer of poly(1,5diaminonaphthalene) had functional amino groups on the polymer chains. The combination of polypyrrole nanowire and poly(1,5diaminonaphthalene) showed a promising material for electrochemical biosensing. Here we reported an electrochemical immunosensor based on this approach for the purpose of detecting breast cancer biomarkers. The bilayer could enhance the surface coverage of antibody anti-CA 15-3 and consequently improve the sensitivity and stability of the immunosensors. The magnetic beads were used as carriers of labeled antibody anti-CA15-3 and HRP (horseradish peroxidase) in order to achieve an amplification of the signal. Under optimized conditions, the linear range of the immunoassay was 0.05e20 U mL1 with a detection limit of 0.02 U mL1 CA 15-3 antigen.
Low Cost Motor Drive Technologies for ASEAN Electric Scooter
V. Tran Tuan,S. Kreuawan,P. Somsiri,P. Nguyen Huy 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.4
This work investigates two different motor drive technologies, switched reluctance motor (SRM) and induction motor (IM). They are designed optimally to meet the desired performances for electric scooters. The comparison of both motors is described in terms of performances and material cost. With the similar constraint, induction motor performs slightly better than switched reluctance motor. But this must be traded-off with higher weight and cost. Both drive systems are, however, suitable for electric scooter application. Finally, the range simulations are conducted on a European urban driving cycle, ECE15 driving cycle and a more realistic cycle, Bangkok driving cycle. The escooter ranges are varied from 36 to 109 km depending on driving cycle, motor technology and number of passengers.