Mechanism underlying

The nonlinear dynamic buckling responses of functionally graded graphene platelet reinforced composite (FG-GPLRC) cylindrical and sinusoid panels with porous core are presented in this paper. The governing formulations are established by applying the nonlinear higher-order shear deformation theory (HSDT).

10p viengfa 28-10-2024 1 1   Download

The study was therefore conducted to gain more insights into EFL teaching practices at Vietnamese high schools under the influences of the NHSGE English tests. Two main aspects of EFL teaching, including “what and how teachers teach” in the centralized educational context of Vietnam would be explored.

20p viling 11-10-2024 0 0   Download

This study focuses mainly on the normal stresses that are caused by applied forces. As a case study, the present work aims at investigating the bi-dimensional contact mechanics of wavy cosinusoidal anisotropic finite planes. To achieve this objective, results on the displacement and stress component are first calculated with the help of the Lekhnitskii formalism.

9p vibecca 01-10-2024 1 1   Download

In this study, a numerical model was developed to simulate the mechanical behavior of an orthotropic steel bridge deck (OSBD) strengthened with UHPC under localized loads based on the five-point bending beam test configuration.

10p vibecca 01-10-2024 2 0   Download

The scope of this work is threefold: (i) to develop a new model within the framework of hydro-mechanical – damage coupling that can account for the coupling between microcrack (damage), water diffusion and shrinkage at stake for concrete secondary creep; (ii) to implement it in an existing hydro-damage lattice model; (iii) to validate the model with respect to the flexural creep of Fiber Reinforced Concrete (FRC) and Mortars under high sustained load level.

12p vibecca 01-10-2024 2 1   Download

The aim of this study was to investigate the photocatalytic activity improving of TiO2, Ag-TiO2 as photocatalysts which immobilized on perlite granules to degrade MB from synthetic wastewater under solar light irradiation. The photocatalytic mechanisms induced by solar light responsive Ag-TiO2/perlite composite was also proposed to demonstrate the photodegradation of MB cationic dye.

7p vikwong 29-09-2024 3 1   Download

Polyurethane (PU) thin films quickly degrade under the presence of oxygen, vapor, temperature, and ultraviolet irradiation. Thus, efforts have been dedicated to improving the properties of PU films. This study presents a simple synthesis route to prepare PU embedded with CeO2-SiO2 nanocomposites (CS NCs).

7p vikwong 29-09-2024 5 1   Download

In this paper, the continuous stiffness measurement (CSM) indentation is employed to investigate fatigue mechanical properties of structural steel under cyclic loading. For this purpose, several representative analytical approaches were introduced to estimate the basic mechanical properties including Young’s modulus and indentation hardness from the characteristics of the loading/unloading curves.

11p vifilm 24-09-2024 3 1   Download

A big question in the numerical approaches for the mechanical behavior of the textile-reinforced concrete (TRC) composite under tensile loading is how to model the cracking of the cementitious matrix. This paper presents numerical results of 3-D modeling of TRC composite in which the non-linear behavior model was used by considering the cracking for the cementitious matrix.

12p vifilm 24-09-2024 1 1   Download

Mechanical behaviour of bituminous mixtures is characterized by the great thermal sensitivity and the large viscous effects. This paper focuses on the linear viscoelastic (LVE) behaviour of bituminous mixtures that is considered for pavement design.

10p vifilm 24-09-2024 1 1   Download

In comparison with fiber-reinforced polymer (FRP) composite, the textile-reinforced concrete (TRC) presents stability in mechanical performance at elevated temperatures thanks to a thermal protection layer by the cementitious matrix. This paper presents the experimental characterization and analytical modeling for fire performance of carbon TRC under the thermomechanical regime at constant tensile force.

12p vifilm 24-09-2024 4 1   Download

Landslides are one of the most prevalent geological disasters in nature and rainfall infiltration is one of the key triggering factors of landslides. In this study, a laboratory flume model experiment was performed to investigate rainfall infiltration processes and failure mechanisms of sand slopes under artificial rainfall of 90 mm/h.

16p vifaye 20-09-2024 4 1   Download

Steel corrosion affects the failure mechanism of deteriorated reinforced concrete (RC) beams. Meanwhile, there is a lack of research on the shear behavior of corroded RC beams, particularly corroded steel fiber reinforced concrete (SFRC) beams. This paper investigates the shear behavior of corroded SFRC beams with a 1.5 shear span-to-depth ratio.

14p vifaye 20-09-2024 3 1   Download

In this study, we assessed the status of antibiotic resistance of H. pylori isolates to antimicrobial agents at Hospital of Hue University of Medicine and Pharmacy in Central Vietnam and identified the underlying molecular mechanisms related to tetracycline and amoxicillin resistance.

8p vifaye 20-09-2024 4 1   Download

This study aims to investigate the effectiveness of the green microwave technique in producing 1T/2H-MoS2 nanomaterials using polyol solvents. The paper presents a thorough analysis of the structural and property characteristics of the synthesized materials and elucidates the underlying chemical mechanism that governs the formation of hybrid-phase nanostructures. Additionally, the role of polyol solvents in the practical synthesis of nano MoS2 under microwave heating is evaluated and explained.

15p xuanphongdacy06 18-09-2024 1 1   Download

In this study, the evolution of the dislocation cell structure and variation of mechanical properties of structural steel under low-cycle fatigue were studied using the indentation experiment, optical microscope, and transmission electron microscope examinations.

13p viyoko 20-09-2024 6 1   Download

Unsaturated soil behaviors characterize the failure mechanisms of geotechnical infrastructures with transient seepage conditions. Therefore, an accurate estimate of the unsaturated groundwater flow is vital in improving hazard management and assessment. This study attempts to develop a numerical scheme for 2-D transient analysis under unsaturated conditions.

11p viyoko 20-09-2024 2 1   Download

This paper presents a theoretical study that describes the fiber bridging mechanism under tensile stress using a closed-form analytical function. This proposed analytical model allows estimating the stress at a crack opening where the fiber orientation is represented by a Gaussian-like periodic distribution function.

14p vifaye 20-09-2024 6 1   Download

The efficient synthesis of 12-substituted-3,4,4a,5,12,12a-hexahydrobenzo[b]acridine-1,6,11(2H)-triones starting from 2-amino-1,4-naphthoquinone, 1,3-cyclohexanedione, and different (hetero)aromatic aldehydes was developed. These reactions were carried out in acetic acid under microwave irradiation in the presence of p-toluenesulfonic acid as catalyst. The structure of the newly synthesized compounds were confirmed employing spectroscopic data as well as elemental analysis. The plausible mechanism of these three-component domino reactions was also described.

7p dianmotminh02 03-05-2024 4 1   Download

Structural and spatial patterns of tree species in forests are important indicators to explain which underlying mechanisms or processes regulating forest structure. In this article, techniques of spatial point pattern analysis were used to characterize structural and spatial patterns of two secondary rain forest stands in Cuc phuong National park, Vietnam.

9p vilarry 01-04-2024 8 2   Download