European Journal of Applied Physiology 
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This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.Computational fluid dynamics modeling of gas-solid fluidized bed reactor: Influence of numerical and operating parameters
AbstractIn this paper, the most influential parameters (numerical and operating parameters) affecting the performance of fluidized bed reactors are studied. The investigated parameters are constitutive and numerical parameters, minimum fluidization velocity, operating pressure, temperature, gas distributor, and particle size distribution (PSD). Furthermore, the recent methods for solving population balance equations coupled with computational fluid dynamic (CFD-PBM) are discussed. The direct quadrature method of moments (DQMOM) was found to be the most efficient method for CFD-PBM coupled simulations. It must be pointed ou...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Stabilizing the unstructured Volume-of-Fluid method for capillary flows in microstructures using artificial viscosity
AbstractParasitic currents still pose a significant challenge for the investigation of two-phase flow in Lab-on-Chip (LoC) applications with Volume-of-Fluid (VoF) simulations. To counter the impact of such spurious velocity fields in the vicinity of the fluid interface, this work presents an implementation of an artificial interface viscosity model in OpenFOAM. The model is introduced as an additional damping term in the momentum conservation equation. It is implemented as an fvOption, allowing for its simple application to existing VoF solvers. Validation is performed with hydrodynamic and wetting cases, in which constant...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Experimental and LBM simulation study on the effect of bubble merging on saturated pool boiling in pure water
AbstractThe foaming characteristic of surfactant solution is rarely discussed in surfactant enhancing pool boiling heat transfer and the critical heat flux (CHF). In the present work, saturated pool boiling experiment using transparent heating plate of indium tin oxide (ITO) coating and lattice Boltzmann method (LBM) simulation are conducted to get further insights into the effect of bubble merging on the wettability characteristics and CHF. With a high-speed camera, the gas –liquid phase and nucleate site distribution at the heating surface are recorded. The improved Shan–Chen model is applied in LBM simulation to inv...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Field and laboratory experimental studies on hard-rock tunnel excavation based on disc cutter coupled with high-pressure waterjet
This study provides a useful reference for the design and construction of high-pressure water-jet-assisted cutterheads for breaking road headers. (Source: European Journal of Applied Physiology)
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete under freeze –thaw cycling
This study empirically investigated the influence of freeze –thaw cycling on the dynamic splitting tensile properties of steel fiber reinforced concrete (SFRC). Brazilian disc splitting tests were conducted using four loading rates (0.002, 0.02, 0.2, and 2 mm/s) on specimens with four steel fiber contents (0%, 0.6%, 1.2%, and 1.8%) subjected to 0 and 50 fr eeze–thaw cycles. The dynamic splitting tensile damage characteristics were evaluated using acoustic emission (AE) parameter analysis and Fourier transform spectral analysis. The results quantified using the freeze–thaw damage factor defined in this paper indicate ...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Experimental study on the stratum applicability and mechanisms of bubble-slurry for earth pressure balance shields
In this study, an anionic surfactant was used to foam in bentonite slurry to form bubble –slurry to maximize the synergy between bubbles and slurry. The slump, volume stability, and permeability test of bubble–slurry-conditioned sand was conducted to examine the conditioning effect, and the stratum applicability of bubble–slurry was determined from the perspective of permeability. It was found that the conditioning effect of bubble–slurry in coarse gravel soil was excellent and could expand the applicability of EPB shields. The main stabilization mechanism of bubble–slurry is that bentonite particles provide a sp...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Compressive strength prediction and optimization design of sustainable concrete based on squirrel search algorithm-extreme gradient boosting technique
AbstractConcrete is the most commonly used construction material. However, its production leads to high carbon dioxide (CO2) emissions and energy consumption. Therefore, developing waste-substitutable concrete components is necessary. Improving the sustainability and greenness of concrete is the focus of this research. In this regard, 899 data points were collected from existing studies where cement, slag, fly ash, superplasticizer, coarse aggregate, and fine aggregate were considered potential influential factors. The complex relationship between influential factors and concrete compressive strength makes the prediction a...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Influence of freeze –thaw damage gradient on stress–strain relationship of stressed concrete
AbstractFreeze –thaw damage gradients lead to non-uniform degradation of concrete mechanical properties at different depths. A study was conducted on the stress–strain relationship of stressed concrete with focus on the freeze–thaw damage gradient. The effects of relative freeze–thaw depths, number of free ze–thaw cycles (FTCs) and stress ratios on the stress–strain curves of concrete were analyzed. The test results demonstrated that freeze–thaw damage was more severe in the surface layers of concrete than in the deeper layers. The relative peak stress and strain of concrete degraded bilinearly with increasin...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Microdamage study of granite under thermomechanical coupling based on the particle flow code
In this study, an improved temperature-dependent linear parallel bond model is introduced under the framework of a particle flow simulation. A series of numerical thermomechanical coupling tests are then conducted to calibrate the micro-parameters of the proposed model by considering the mechanical behavior of the rock under different thermomechanical loadings. Good agreement between the numerical results and experimental data are obtained, particularly in terms of the compression, tension, and elastic responses of granite. With this improved model, the thermodynamic response and underlying cracking behavior of a deep-buri...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Thermo-mechanical simulation of frost heave in saturated soils
AbstractRoads are exposed to various degradation mechanisms during their lifetime. The pavement deterioration caused by the surrounding environment is particularly severe in winter when the humidity and subfreezing temperatures prevail. Frost heave-induced damage is one of the winter-related pavement deterioration. It occurs when the porewater in the soil is exposed to freezing temperatures. The study of frost heave requires conducting a multiphysics analysis, considering the thermal, mechanical, and hydraulic fields. This paper presents the use of a coupled thermo-mechanical approach to simulate frost heave in saturated s...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Effects of time-varying liquid bridge forces on rheological properties, and resulting extrudability and constructability of three-dimensional printing mortar
This study proposes a particle-based method to simulate 3D printing mortar extrusion and construction as an overall planning tool for building design. First, a discrete element model with time-varying liquid bridge forces is developed to investigate the microscopic effects of these forces on global rheological properties. Next, a series of numerical simulations relevant to 3D printable mortar extrudability and constructability are carried out. The study demonstrates that the effects of time-varying liquid bridge forces on rheological properties and the resulting extrudability and constructability of 3D printing mortar are ...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Optimization of the mechanical performance and damage failure characteristics of laminated composites based on fiber orientation
In this study, the effect of fiber angle on the tensile load-bearing performance and damage failure characteristics of glass composite laminates was investigated experimentally, analytically, and numerically. The glass fabric in the laminate was perfectly aligned along the load direction (i.e., at 0 °), offset at angles of 30° and 45°, or mixed in different directions (i.e., 0°/30° or 0°/45°). The composite laminates were fabricated using vacuum-assisted resin molding. The influence of fiber orientation angle on the mechanical properties and stiffness degradation of the laminates was stu died via cyclic tensile stre...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Optimization design of anti-seismic engineering measures for intake tower based on non-dominated sorting genetic algorithm-II
AbstractHigh-rise intake towers in high-intensity seismic areas are prone to structural safety problems under vibration. Therefore, effective and low-cost anti-seismic engineering measures must be designed for protection. An intake tower in northwest China was considered the research object, and its natural vibration characteristics and dynamic response were first analyzed using the mode decomposition response spectrum method based on a three-dimensional finite element model. The non-dominated sorting genetic algorithm-II (NSGA-II) was adopted to optimize the anti-seismic scheme combination by comprehensively considering t...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Performance analysis of a novel medium temperature compressed air energy storage system based on inverter-driven compressor pressure regulation
AbstractIn compressed air energy storage systems, throttle valves that are used to stabilize the air storage equipment pressure can cause significant exergy losses, which can be effectively improved by adopting inverter-driven technology. In this paper, a novel scheme for a compressed air energy storage system is proposed to realize pressure regulation by adopting an inverter-driven compressor. The system proposed and a reference system are evaluated through exergy analysis, dynamic characteristics analysis, and various other assessments. A comprehensive performance analysis is conducted based on key parameters such as the...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
Analysis of substrate specificity of cytochrome P450 monooxygenases involved in trichothecene toxin biosynthesis
AbstractTrichothecenes are a structurally diverse family of toxic secondary metabolites produced by certain species of multiple fungal genera. All trichothecene analogs share a core 12,13-epoxytrichothec-9-ene (EPT) structure but differ in presence, absence and types of substituents attached to various positions of EPT. Formation of some of the structural diversity begins early in the biosynthetic pathway such that some producing species have few trichothecene biosynthetic intermediates in common. Cytochrome P450 monooxygenases (P450s) play critical roles in formation of trichothecene structural diversity. Within some spec...
Source: European Journal of Applied Physiology - January 17, 2024 Category: Physiology Source Type: research
