considerable information exists in the literature showing that expansive layer silicates are not the only clay minerals present in vertisols. however, the presence of a very high clay content dominated by fine clay, regardless of the clay type, together with the wetting and drying cycle in the soil can also produce a high shrink-swell potential. we studied some vertisols with diverse parent mat...

A special version of Conditional Moment Closure – PCMC – is suggested for modeling reacting flows in porous media. The model involves conditioning on a special tracer scalar, which is introduced to characterize scalar transport in the gaseous phase. (i.e. for the flow in the interparticle space or in the pores). The model accounts for interparticle variations of species concentrations and emula...

The Lower Silurian black shale in the Southeast of Chongqing is great potential accumulation gas South China. In order to understand pore system these shales, mercury porosimetry, surface area study, mineralogy and image analyses by scanning electronic microscopy were performed. Four major types (interparticle pores, intraparticle organic-matter pores microfractures) classified under observatio...

Porosity in catalyst particles is essential because it enables reactants to reach the active sites and it enables products to leave the catalyst. The engineering of composite-particle catalysts through the tuning of pore-size distribution and connectivity is hampered by the inability to visualize structure and porosity at critical-length scales. Herein, it is shown that the combination of phase...

Membrane capacitive deionization (MCDI) is a technology for water desalination based on applying an electrical field between two oppositely placed porous electrodes. Ions are removed from the water flowing through a channel in between the electrodes and are stored inside the electrodes. Ion-exchange membranes are placed in front of the electrodes allowing for counterion transfer from the channe...

Effect of interparticle force on the hydrodynamics of gas-solid fluidized beds was investigated using the combined method of computational fluid dynamics and discrete element method (CFD-DEM). The cohesive force between particles was considered to follow the van der Waals equation form. The model was validated by experimental results from literature in terms of bed voidage distribution and Eule...

The influence of high-rank coal’s pore characteristics on the physical properties, gas-bearing and exploitation coal reservoirs is becoming more prominent. How to establish classification describe networks combining quantitative qualitative has emerged as a major problem, which may offer scientific foundation deepen understanding this issue. In research, structure fractal reservoir pores were d...

Lower Cambrian shale and lower Silurian are both typical of oil-prone kerogen siliceous composition, but different in thermal maturities. Porosity differences were determined marine shales between the two shales. Measurements utilized including organic geochemistry, XRD, scanning electron microscopy (SEM) N2 gas adsorption. Pore volume (PV) was approximately 1.5 times higher than that shale, po...

ÐTi±Si mixtures were subjected to high-strain-rate deformation at a pressure below the threshold for shock-wave initiation. Whereas the collapse of interparticle pores did not initiate reaction, regions of localized macro-deformation initiated reaction inside shear bands at suciently high strains (g010), and propagation of the reaction through the entire specimen at higher strains (g020±40). T...

Nanoporous silicon (NPSi) has received significant attention for its potential to contribute to a large number of applications, but has not yet been extensively implemented because of the inability of current state-of-the-art nanofabrication techniques to achieve sufficiently small pore size, high aspect ratio, and process scalability. In this work we describe the fabrication of NPSi via a modi...