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Tran Dang Thanh,Dinh Chi Linh,Le Viet Bau,Thi Anh Ho,Tien Van Manh,The-Long Phan,Seong-Cho Yu IEEE 2015 IEEE transactions on magnetics Vol.51 No.1
<P>Four samples of La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>Mn<SUB>0.92</SUB>Co<SUB>0.08</SUB>O<SUB>3</SUB> (LSMCO) with different crystallite sizes were prepared by the combination of solid-state reaction and mechanical milling methods. Based on isothermal magnetization data, M(H), temperature dependences of magnetic entropy change, ΔS<SUB>m</SUB>T, of the samples under a magnetic field change of 10 kOe were calculated. The maximum values of magnetic entropy change (|ΔS<SUB>max</SUB>|) at room temperature are in the range of 0.9-1.4 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP>, corresponding to ferromagnetic (FM)-paramagnetic phase transition. In addition, M<SUP>2</SUP> versus H/M curves at temperatures around TC prove the samples exhibiting a second-order magnetic phase transition. The critical exponents β, γ, and δ were determined using the modified Arrott plot method and critical isotherm analysis. Here, these exponent values are located in between those expected for the mean-field theory and 3-D Heisenberg model. It means the coexistence of short-range and long-range FM interactions in LSMCO nanoparticles.</P>
Dielectric resonance effect with negative permittivity in a La1.5Sr0.5NiO4+δ ceramic
Tran Dang Thanh,Nguyen Van Dang,Le Van Hong,The-Long Phan,Seong-Cho Yu 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.10
A polycrystalline sample of La1.5Sr0.5NiO4+δ was prepared by using a solid-state reaction. Xraydiffraction proved the sample to be a single phase with a tetragonal structure (space group:I4/mmm). By using an iodometric titration method to determine the non-stoichiometric oxygenconcentration (δ) in La1.5Sr0.5NiO4+δ, we found δ = −0.017, which corresponds to a doping level ofnh = x + 2δ = 0.466. Also, a strong increase of the magnetization in theM(T) curve at temperaturesbelow the spin-ordering temperature (TSO 100 K) was observed. The M(H) curves show verysmall magnetic moments, which proves the weak ferromagnetic nature of La1.5Sr0.5NiO4+δ. Thedependences of the dielectric constant on the frequency and the temperature, "(!, T) = "0(!, T) +i"00(!, T), was investigated in the frequency range of 1 − 13 MHz. At temperatures around roomtemperature, the maximum of the real part ("0) was higher than 105. Particularly, an abnormaldependence of the permittivity on frequency was observed. Depending on temperature, a dielectricresonance was observed at about 500 kHz or 8 MHz. Interestingly, we observed the dielectricresonanceeffect with a negative permittivity. Such a feature is very similar to that observed inleft-handed materials. The fitting of the experimental data for the dielectric constant at frequenciesaround the resonance frequency to the equations associated with an equivalent RLC series circuitproves that La1.5Sr0.5NiO4+δ belongs to the class of multiferroic materials.
Application of ANFIS to the design of elliptical CFST columns
Ngoc-Long Tran,Trong-Cuong Vo,Duy-Duan Nguyen,Van-Quang Nguyen,Huy-Khanh Dang,Viet-Linh Tran Techno-Press 2023 Advances in computational design Vol.8 No.2
Elliptical concrete-filled steel tubular (CFST) column is widely used in modern structures for both aesthetical appeal and structural performance benefits. The ultimate axial load is a critical factor for designing the elliptical CFST short columns. However, there are complications of geometric and material interactions, which make a difficulty in determining a simple model for predicting the ultimate axial load of elliptical CFST short columns. This study aims to propose an efficient adaptive neuro-fuzzy inference system (ANFIS) model for predicting the ultimate axial load of elliptical CFST short columns. In the proposed method, the ANFIS model is used to establish a relationship between the ultimate axial load and geometric and material properties of elliptical CFST short columns. Accordingly, a total of 188 experimental and simulation datasets of elliptical CFST short columns are used to develop the ANFIS models. The performance of the proposed ANFIS model is compared with that of existing design formulas. The results show that the proposed ANFIS model is more accurate than existing empirical and theoretical formulas. Finally, an explicit formula and a Graphical User Interface (GUI) tool are developed to apply the proposed ANFIS model for practical use.
Chien Minh Tran,Ngoc Thi‑Thanh Nguyen,Minh Hieu Ho,Vinh Khanh Doan,Khanh Loan Ly,Nhi Ngoc‑Thao Dang,Nam Minh‑Phuong Tran,Hoai Thi‑Thu Nguyen,Long Phuoc Truong,Thai Minh Do,Quyen Ngoc Tran,Hien Quoc Ng 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
In this study, we proposed a straightforward electrospun polycaprolactone (PCL) loaded with silver nanoparticles (SNPs)membrane fabrication process, in which SNPs were directly synthesized from silver nitrate (AgNO3) in PCL–acetone mixtureby gamma irradiation. The insolubility of AgNO3in PCL solution was solved using an auxiliary dimethyl sulfoxide solvent. As a physical approach, gamma rays readily converted silver ions into SNPs without the addition of harmful reductionagents, which reduced the cytotoxicity of the synthesized material. By avoiding some processes such as purification, solventremoval, or redispersion of SNPs, this method was more time-saving compared to other related studies. SNPs formation wasconfirmed by both UV–Visible spectrum (UV–Vis) and X-ray diffraction analysis. Scanning electron microscopy (SEM)revealed that the addition of SNPs significantly reduced the fiber diameter of PCL–Ag membranes compared to that of rawPCL. Uniform spherical-shaped SNPs incorporated in PCL fibers were observed under transmission electron microscopy(TEM). The tensile test showed that the electrospun PCL–Ag membranes exhibited good mechanical characteristics. Moistureeasily penetrated the porous microstructure of PCL–Ag, facilitating wound humidity regulation. Inductively coupledplasma-mass spectroscopy (ICP-MS) was employed to study the release profiles of SNPs at different time intervals. Overall,the PCL–Ag 500 ppm sample exerted excellent antibacterial activity against Pseudomonas aeruginosa and Staphylococcusaureus strains and low in vitro cytotoxicity.
Magnetic Properties and Magnetocaloric Effect at Room Temperature of Ni50−xAgxMn37Sn13 Alloys
Tran Dang Thanh,Nguyen Thi Mai,Nguyen Huy Dan,The-Long Phan,유성초 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.10
In this work, we present a detailed study of the magnetic properties and the magnetocaloric effectat room temperature of Ni50−xAgxMn37Sn13 alloys with x = 1, 2, and 4, which were prepared byusing an arc-melting method. Experimental results reveal that a partial replacement of Ag for Nileads to a decrease in the anti-FM phase in the alloys. In addition, the martensitic-austenitic phasetransition shifts towards lower temperature and is broaded. The Curie temperature (TAC ) for theaustenitic phase also shifts toward to lower temperature, but not by much. The Curie temperaturewas found to be 308, 305, and 298 K for x = 1, 2, and 4, respectively. The magnetic entropychange (Sm) of the samples was calculated by using isothermal magnetization data. Under anapplied magnetic field change of 10 kOe, the maximum value of Sm (|Smax|) was achieved ataround room temperature and did not change much (0.8 J·kg−1·K−1) with increasing Ag-dopingconcentration. Particularly, the M2 vs. H/M curves prove that all the samples exhibited a secondordermagnetic phase transition. Based on Landau’s phase-transition theory and careful analyses ofthe magnetic data around the TAC , we have determined the critical parameters ,, , and TC. Theresults show that the values are located between those expected for the 3D-Heisenberg model (= 0.365) and mean-field theory ( = 0.5). Such a result proves the coexistence of short-range andlong-range ferromagnetic interactions in Ni50−xAgxMn37Sn13 alloys. The nature of the changes inthe critical parameters and the |Smax| is thoroughly discussed by means of structural analyses.
Energy-Aware Real-Time Routing for Large-Scale Industrial Internet of Things
Long, Nguyen Bach,Tran-Dang, Hoa,Kim, Dong-Seong IEEE 2018 IEEE Internet of things journal Vol.5 No.3
<P>This paper proposes a routing scheme that enhances energy consumption and end-to-end delay for large-scale Industrial Internet of Things (IIoT) systems based on IEEE 802.15.4a MAC. In the current IIoT, a larger-scale and complex deployment has been a noticeable obstacle for minimizing power consumption and routing on real-time. Thus, the proposed algorithm is targeted at large-scale systems where data are aggregated through different clusters on their way to the sink. Moreover, a hierarchical system framework is employed to promote scalability of IIoT elements. By estimating the residual energy and hop counts for each path, the data can be forwarded to the destination through the optimal path. Simulation results show that the scheme can reduce the energy consumption and end-to-end delay effectively.</P>