HCMUS - Danh sách bài trích tạp chí (The List of Article) (398)
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In – depth information about the characteristics and potential use of post-gasification residues is the key to unlock the sustainability potential of biomass gasification. This study aimed to explicate the physico-chemical properties of residues after the gasification of macadamia nut shell using a commercial gasifier. The results revealed an important amount of carbon content remained in the residues, marking the low conversion efficiency of the process. The obtained residues were deemed unsuitable for use as adsorbents due to low surface areas with non-porous structures. However, the surface of the residues contained multiple carboxyl and hydroxyl functional groups. Also, a remarkab... |
The present paper develops a new failure analysis method under plane strain conditions considering a generalized linear yield criterion. The yield criterion and the stress equilibrium equations constitute a hyperbolic system of equations. It is shown that two auxiliary variables satisfy the equation of telegraphy. Simple analytical relationships connect these variables and the radii of curvature of the characteristic curves. The calculated radii of curvature allow the corresponding characteristic net to be constructed. Then, the stress field is determined using another set of analytical relationships. Thus, a numerical procedure is only necessary for solving the equation of telegraphy... |
MS-RCPSP is a combinatorial optimization problem with many practical applications, this problem has been proven to belong to the NP-hard class, the approach to solving this problem is to use algorithms to find an approximate solution. In this paper, we adopted a new adaptive nonlinear weight update strategy based on fitness value and new neighborhood topology for Particle Swarm Optimization algorithm, thereby helping to prevent PSO from falling into local extremes. The new algorithm is called AdaL-PSO. A numerical analysis is carried out using iMOPSE benchmark dataset and is compared with some other early algorithms. The results presented suggest the prospect of our proposed algorithm... |
In this work, the electrochemical behavior of carbon steel, brass, bronze and aluminum alloys in the presence of various important organic acids (sebacic acid (SbA), terephthalic (TPA), 2-ethylhexanoic (E2C6A), and octanoic (C8A)) and the effect that these have on the growth and protectiveness of the alloys have been investigated. The results show that the presence of organic acids in the coolant increases the protective effect of the system by forming a film on the surface of the alloys. The EIS impedance results demonstrate the formation of active and passive protective layers on the surface of the alloys. The results of surveying 04 types of organic acids for the protection of diff... |
isulfate intercalated graphites with different particle sizes were prepared by a chemically oxidative method using natural flaky graphites as raw materials. The morphology and structure of the expandable graphites were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction patterns, and scanning electron microscope. The effect of the particle size on the expanded volume was also investigated. Expandable graphite with +100 mesh particle size (EG100) showed the highest expanded volume of 225 mL/g. Moreover, a combination of expandable graphite, red phosphorus (RP), and melamine cyanurate (MC) into a polypropylene (PP) matrix exhibited a synergistic flame retardant effec... |
Collagen is a natural protein present in the animal and human body. It is in natural fibrous and can be found in the connective tissue and flesh of mammals, approximately 25 - 35 wt.% of total human protein. Collagen is abundant in fibrous tissues such as bones, cartilage, tendons, blood vessels, ligaments, skin, cornea, aortic disc, and intestines. Fish collagen is currently being studied as a new biological substitute for collagen from animals. It is extracted from by-products (scales, skins, bones, etc.) by biochemical or biological methods is safe, has high adsorption, high compatible. The factors influencing on the extraction process include temperature, time, concentration of in... |
Synthesis and characterization of PVP coated gadolinium oxide nanoparticles for imaging applications In this work, we present the synthesis and applications of Gd2O3@PVP nanoparticles as an efficient contrast agent for MRI and CT techniques. Gd2O3@PVP nanoparticles have been successfully synthesized by the polyol method using ethylene glycol and poly(vinylpyrrolidone) as solvent and surfactant, respectively. The structure, morphology and characteristic properties of the materials are thoroughly investigated by SEM, TEM, UV-Vis, XRD, FTIR and DLS measurements. As an important result, NPs synthetized under optimized conditions have a diameter in the range of 12 nm and exhibit a good contrast signal in magnetic resonance imaging and computed tomography at relatively low concentration ([... |
To solve this challenge, this paper proposes two different approaches to increase the flexibility of the fuzzy interrogation system. For the first and foremost approach, based on similarity measures and fuzzy logic, we develop three fuzzy query processing algorithms for single-condition and multi-condition cases such as FQSIMSC (Fuzzy Query Simulation Single Condition), FQSIMMC (Fuzzy Query Simulation Multiple Condition) based on the proposal of Y. Bashon [27] and FQSEM (Fuzzy Query SEM) based on the proposal of Z. M. Ma [28]. As for the second approach, we combine the fuzzy clustering algorithm EMC (Expectation Maximization Coefficient) and the query processing algorithm based on fuz... |
Tetracycline (TC) is a broad-spectrum antibiotic used in the treatment of several infectious diseases. The excessive use of tetracycline antibiotics, especially tetracyclines in livestock, has raised concerns about residues of tetracycline antibiotics in food that may affect consumers' health. It is necessary to develop a rapid test strip for detecting tetracycline antibiotic residues in food and animal feed. This paper presents the suitable conditions for the conjugation of tetracycline to BSA or KLH: molar ratio of TC:BSA/KLH was 25:1, formaldehyde concentration of 5 %, temperature of 4oC and reaction time of 4 hours. The KLH-TC conjugate was used to successfully raise polyclonal an... |
The article is devoted to the shape optimization of shell structures in Comsol Multiphysics using three gradient-based methods: IPOPT (Interior Point OPTimizer), SNOPT (Sparse Nonlinear OPTimizer) and MMA or GCMMA (the Method of Moving Asymptotes). Two types of complex shapes, such as right helicoid and developable helicoid are taken for the computational experiment. The task is to investigate the initial design and optimization process of two helicoids. To obtain a more accurate result and an interesting design solution, the calculation is carried out using three physics-controlled mesh sizes: extra coarse, fine and extra fine with varying values of special optimization settings, suc... |
Corrosion under insulation (CUI) is very common and severely occurs in chemical/oil and gas industries, however, it is difficult to detect this corrosion by non-destructive testing (NDT) techniques. Carbon steel resistant sensors were used to determine CUI in this research. The output voltage values of the sensor were measured over time and from which the corrosion loss in sensor’s thickness was calculated. Carbon steel samples were exposed to the sensors under the same conditions for the same periods, and the corrosion loss of the samples was determined by weight loss. The results show that when the sensors were corroded within 10-20 % the corrosion loss of carbon steel samples is eq... |
The changes in Subthreshold Swing (SS) were observed for changes in remanent polarization Pr and coercive field Ec, which determine the characteristics of the P-E hysteresis curve of ferroelectric in Ferroelectric FET (FeFET). A Metal-Ferroelectric-Metal-InsulatorSemiconductor (MFMIS) structure was used for the junctionless double gate structure. To obtain the SS value, the analytical SS model was used. The ranges of 15 ≤ Pr≤ 30 μC/cm2 and 0.8 ≤ Ec ≤ 1.5 MV/cm, which were reasonable in various experiments and did not generate unstable regions in the relationship of drain current and gate voltage, were considered. |
In this study, for the first time, L-asparaginase (ASNase) productive capacity of forty marine bacteria originating from Khanh Hoa sea of Viet Nam was screened and reported. Among those, twenty eight isolates were clarified for their extracellular ASNase activity based on their ability to form a pink zone around colonies on asparagine agar plates. As a result, four strains GB910, GB911, GB976 and GB982 showed high secreted extracellular ASNase activity, ranging from 8.64 to 13.22 IU/mg. Among these four most potential strains, GB911 exhibited better enzyme production capacity and was subjected to taxonomy identification. According to the 16S rRNA gene sequence on the GenBank database,... |
In this study, we fabricated α-Fe2O3 materials via a facile hydrothermal route to use as the active material for the anode of an iron-based battery. The particle size of α-FeO3 was in a range of a few hundreds of nanometers to a few micrometers. The structural characteristics and particle size of the synthesized iron oxides were studied via X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical behavior of iron oxide electrode was investigated by cyclic voltammetry (CV). The distribution of iron species was observed by Energy dispersive X-ray spectroscopy (EDS) measurement. Carbon was used as an additive to improve the conductivity of α-Fe2O3/C composite ... |
Notably, four strains (Klebsiella variicola B1, Enterobacter cloacae B4, B6, and Enterobacter asburiae B11) exhibited high indole acetic acid (IAA) production, a plant growth hormone. Strains K. variicola B1 and E. cloacae B4 also displayed phytase and phosphatase activity, potentially enhancing plant nutrient availability. These IAA-producing strains were further evaluated for their ability to promote tomato plant growth. After 28 days of root inoculation, tomato plants exhibited a 19 - 22 % increase in growth compared to controls.. This study highlights the first isolation of endophytic bacteria from Vetiver grass in dioxin-contaminated soil and identifies potential bacterial candid... |
In this report, Ag nanoparticle-decorated cobalt carbonate hydroxide microflowers were synthesized using a simple hydrothermal approach without using surfactants, which were used as precursors to prepare Ag nanoparticle-decorated porous Co3O4 nanorods through an annealing process. The porous Co3O4 nanorods were composed of small primary nanoparticles with a size of ~ 10 nm, and their surface was decorated with uniform Ag nanoparticles (~ 10 nm). Sensors based on the porous Co3O4 nanorods decorated with Ag nanoparticles have higher sensitivity and selectivity to H2 gas than other reduced gases, as well as rapid response-recovery times. The enhanced H2 sensing properties of the sample m... |
The catalyst materials at the Ni doping ratios all have the monoclinic-scheelite BiVO4 structure as shown by the XRD and Raman methods. The photocatalytic ability of methyl blue (MB) on the Ni/BiVO4 catalyst was studied under visible light irradiation in order to contribute to reducing the current environmental pollution problem. The removal efficiency of MB varies with the doping ratio of Ni/BiVO4, reaching the highest decomposition efficiency of 84.77 % in the 5 % mol Ni sample, which is 30 % higher than that of the BiVO4 sample. The BiVO4 material modified with Ni giving a high photocatalytic efficiency of organic pigment decomposition under visible light indicates the potential im... |
In this study, the Al2O3-40TiO2 coating applied by APS was penetrated with aluminum phosphate (APP) by ultrasonic excitation method, and then, the effect of heat treatment after the sealing on corrosion protection of Al2O3- 40TiO2 ceramic coating was investigated. The results show that, after being impregnated with APP, the heat treatment at 800 oC assures the coating a lower porosity and better corrosion resistance than heat treatments at 400 and 600 oC. The existence of the durable crystalline phases Al(PO3)3 (Cubic), Al2P6O18 (Monoclinic), and AlPO4 (Orthorhombic) on the surface of the sample heat-treated at 800 oC has contributed to enhancing the corrosion resistance of the Al2O3-... |
XRD pattern of rutile TiO2 bulk and surface energy of possible terminated (110) planes were investigated using the DFT+U method. The (110) surface was demonstrated to be the most popular facet of rutile TiO2, which is in good agreement with the data of the JCPDS card No. 21-1276. The difference in surface energy among possible terminated (110) planes is attributed to the structure of the top and bottom atomic layers. We have found that the P5 plane is the most stable. It represents a structure of the (110) surface. The rutile TiO2 (110) surface has a calculated surface energy of 0.98 J/m2. The value compares well with previous publications. Besides, DFT calculations were also performe... |
In this case study, surveys at solar panel manufacturers, solar power plants, and rooftop solar systems were conducted. The collected information and data are then used to derive solar panels’ lifespan and estimate the amount of waste solar panels till 2050. It is estimated that the cumulative amount of waste solar panels generated in 2022 is about 148 thousand tonnes and is projected to increase to 1.7 million tonnes by 2050. Based on that, sound management solutions towards a circular economy have been proposed to properly manage waste solar panels in Viet Nam. |
