Gas diffusion

Part 1 of ebook "Soil physics with Python: Transport in the soil–plant–atmosphere system" provides readers with contents including: Chapter 1 - Introduction; Chapter 2 - Basic physical properties of soil; Chapter 3 - Soil gas phase and gas diffusion; Chapter 4 - Soil temperature and heat flow; Chapter 5 - Soil liquid phase and soil–water interactions; Chapter 6 - Steady-state water flow and hydraulic conductivity; Chapter 7 - Variation in soil properties; Chapter 8 - Transient water flow;...

211p daonhiennhien 03-07-2024 1 1   Download

Ebook "Gas transport in solid oxide fuel cells" provides a comprehensive overview of contemporary research and emerging measurement technologies associated with gas transport in solid oxide fuel cells. Within these pages, an introduction to the concept of gas diffusion in solid oxide fuel cells is presented. This book also discusses the history and underlying fundamental mechanisms of gas diffusion in solid oxide fuel cells, general theoretical mathematical models for gas diffusion, and traditional and advanced techniques for gas diffusivity measurement.

87p tudohanhtau1006 29-03-2024 6 1   Download

Ebook "Terrestrial biosphere-atmosphere fluxes" provide the tools to understand and quantitatively analyse fluxes of energy, organic compounds such as terpenes, and trace gases including carbon dioxide, water vapour and methane. It first introduces the fundamental principles affecting the supply and demand for trace gas exchange at the leaf and soil scales: thermodynamics, diffusion, turbulence and physiology.

519p duongthandue0501 28-02-2024 6 1   Download

Part 2 book "Physics project lab" includes content: Sound from gas bubbles in a liquid, shape and path of air bubbles in a liquid, ink diffusion in water, refractive index gradients, light scattering by surface ripples, diffraction of light by ultrasonic waves in liquids, the circular hydraulic jump, vortex physics, plastic bottle oscillator, salt water oscillator,... and otehr contents

158p muasambanhan02 18-12-2023 12 3   Download

This study will investigate the effects of VGs and bleeding air on the performance of dump diffusers without the need to change its length and overall size. The study will use a 3D model to discuss the aerodynamic efficiency of the diffuser and propose an optimal solution for the diffuser.

8p vijeff 30-11-2023 7 3   Download

Ebook "Smoke, dust, and haze: Fundamentals of aerosol dynamics" covers the effects of turbulence on coagulation and gas-to-particle conversion and also discusses the formation of primary particles by the collision-coalescence mechanism. The chapter on the atmospheric aerosol has been completely rewritten within the aerosol dynamics framework. Its basic approach and topicality make Smoke, Dust, and Haze: Fundamentals of Aerosol Dynamics, 2/e, an essential guide for both students and researchers.

431p loivantrinh 29-10-2023 6 3   Download

CeO2-SnO2 nanocomposite, a sensing material, was successfully synthesized by a hydrothermal method. The structural, optical and morphological properties of as-prepared CeO2-SnO2 nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy and field emission scanning electron microscopy (FESEM).

6p viberbers 09-08-2023 6 3   Download

Heat and mass transfer flow along a vertical plate under the combined buoyancy force of thermal and species diffusion in the presence of a magnetic field is investigated. This paper examines the effect of variable viscosity with heat and mass transfer over a vertical layer on the magnetic field intensity.

11p vidudley 20-02-2023 5 2   Download

"A first-principles study of propanol adsorption on Monolayer Molybdenum Diselenide (MoSe2)" investigate the adsorption mechanism of propanol gas on the surface of monolayer MoSe2 by the quantum simulation method. The images of the potential energy surfaces for configuration of adsorbate on MoSe2 surface were investigated using the Computational DFT-based Nanoscope tool to explore the most stable configurations and diffusion possibilities.

10p lieuyeuyeu18 23-12-2022 7 3   Download

Helium is relevant in determining nuclear fuel behaviour. It affects the performance of nuclear fuel both in reactor and in storage conditions. Helium becomes important in reactor conditions when high burnups are targeted or MOX fuel is used, whereas for storage conditions it can represent a threat to the fuel rods integrity.

7p vironald 15-12-2022 11 3   Download

Nitrogen-doped porous hard carbons are synthesized by hydrothermal carbonization method (HTC) using glucosamine as biosource and treated at different carbonization temperatures in nitrogen environment (500, 750, 1000°C). The electrochemical performances of hard carbons electrode materials for aqueous electrolyte sodium ion batteries are examined to observe the effect of two different voltage ranges (–0.8-0.0) V and (0.0-0.8) V in 1.0 M Na2SO4 aqueous electrolyte.

13p langthannam 29-12-2021 9 0   Download

Water management is one of the obstacles in the development and commercialization of proton exchange membrane fuel cells (PEMFCs). Sufficient humidification of the membrane directly affects the PEM fuel cell performance. Therefore, 2 different hydrophobic polymers, polydimethylsiloxane (PDMS) and (3-Aminopropyl) triethoxysilane (APTES), were tested at different percentages (5, 10, and 20 wt.%) in the catalyst layer. The solution was loaded onto the surface of a 25 BC gas diffusion layer (GDL) via the spraying method.

17p tudichquannguyet 29-11-2021 10 1   Download

Laggera tomentosa Sch. Bip. ex Oliv. et Hiern (Asteraceae), an endemic Ethiopian medicinal plant, is traditionally used to treat various ailments. Previously, the chemical constituents of the essential oil (EO) of its leaves and inflorescence were documented. However, no data about the chemical compositions of other parts of the EOs of the plant have been reported to date. Moreover, there are no previous biological activity reports on any parts of the EOs of this plant.

10p tudichquannguyet 29-11-2021 13 1   Download

The results showed that Pt particles, deposited by dc-magnetron gun, surround the large Co-clusters deposited by rf-magnetron gun. In addition, the increase of Co content led to an increase in the electrochemical active surface area (EASA) from 23.75 m2 /gPt to 47.54 m2 /gPt for pure Pt and Pt:Co (1:3), respectively, which corresponded the improvement of the utilization of Pt by a factor of 1.91.

17p tudichquannguyet 29-11-2021 9 1   Download

The paper has successfully built a 3D gas flow simulation model in a real diffuser fitted on an aviation gas turbine engine, based on Star CCM + software.

12p cothumenhmong11 05-05-2021 23 1   Download

Global standards require that spirometry should be performed by trained and experienced personnel, who would be able to assess the correct performance of tests by patients and assure good quality of the result.

8p vimichigan2711 26-03-2021 11 2   Download

Lung diffusing capacity for carbon monoxide (DLCO) gives an overall assessment of functional lung surface area for gas exchange and can be assessed using various methods. DLCO is an important factor in exercise intolerance in patients with chronic obstructive pulmonary disease (COPD).

9p vimaine2711 26-03-2021 14 2   Download

Aim of the study is to identify and characterize the bioactive compounds from methanol leaf extract of Enicostemma axillare responsible for the bactericidal activity. The in vitro antibacterial activity was determined by disc diffusion method against Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Enterococcus faecalis and Bacillus subtilis. Gas Chromatography-Mass Spectrometry (GC-MS) studies were carried out to identify the presence of bioactive compounds.

8p nguaconbaynhay8 13-10-2020 11 1   Download

When boron carbide is used as a neutron absorber in nuclear power plants, large quantities of helium are produced. To simulate the gas behaviour, helium implantations were carried out in boron carbide. The samples were then annealed up to 1500 °C in order to observe the influence of temperature and duration of annealing.

8p christabelhuynh 31-05-2020 9 1   Download

Blades and vanes for gas turbines, usually made of Ni-based superalloys, are exposed at very high temperature in severe oxidation and corrosion environments. Nowadays, thermal barrier coating systems (TBCs) have been applied to protect them against such severe working conditions. In this study, Pt and PtIr diffusion coatings on Ni based single crystal superalloys were fabricated by an electroplating method followed by an annealing heat treatment process. The microstructure and phase constitution of the coatings were studied by SEM/EDS and XRD methods.

10p chauchaungayxua2 07-01-2020 13 0   Download