PAPER Snurr et al. Structure–property relationships of porous materials for carbon dioxide separation and capture There is an urgent need to identify porous materials that can efficiently separate CO 2 from mixtures of gases, such as the exhaust of fossil-fuel-based power plants and from impure sources of CH 4 (e.g., natural gas and landfill gas). Recently, researchers have investigated collect...

Ca(2+) entry through CRAC channels causes fast Ca(2+)-dependent inactivation (CDI). Previous mutagenesis studies have implicated Orai1 residues W76 and Y80 in CDI through their role in binding calmodulin (CaM), in agreement with the crystal structure of Ca(2+)-CaM bound to an Orai1 N-terminal peptide. However, a subsequent Drosophila melanogaster Orai crystal structure raises concerns about thi...

Several contrasting uses of the terms macro(large) and micro(small) pore can be identified in soil science literature. In some cases macropores are (i) considered to be pores > 15 (Marshall, 1959) or 100 /im in diam (Bouma et al., 1977) or (ii) implied to be even larger when described in terms of wormholes (Ehlers, 1975), root channels (Aubertin, 1971). and shrinkage cracks (Lewis, 1977). The s...

In this work, the transport equations of ionic species in concrete are studied. First, at porescale considered, which then averaged over a representative elementary volume. The so obtained macroscopic scale thoroughly examined and each term is interpreted. Furthermore, it shown that tortuosity-connectivity does not slow average speed down. volume compared with an equivalent pore. Lastly, compar...

Several hundred taste buds develop and mature in the trench walls of the rat's vallate papilla during the first 3 months after birth. The objective of this investigation of taste bud development was to determine: (i) whether the vallate papilla has local growth zones where new taste buds form, (ii) whether new taste buds arise by the division of mature taste buds, (iii) how many days are requir...

The enrichment of coalbed methane (CBM) and the outburst of gas in a coal mine are closely related to the nanopore structure of coal. The evolutionary characteristics of 12 coal nanopore structures under different natural deformational mechanisms (brittle and ductile deformation) are studied using a scanning electron microscope (SEM) and low-temperature nitrogen adsorption. The results indicate...

Jute fiber/polyethylene biocomposites were prepared using a hot press molding technique. The effects of maleic anhydride, clay, and silica on the physical, mechanical, and thermal properties of jute fiber-reinforced polyethylene (PE) biocomposites with different fiber loadings (5, 10, 15, and 20 wt.%) were investigated. The biocomposites were characterized by Fourier transform infrared spectros...

Pore difference characteristics and adsorption/desorption experiments of primary coal with different degrees were explored to study the pore structure gas desorption. The results show that volume increases increase in degree metamorphism. In metamorphism, distribution micropores, small pores, medium-sized pores (by volume) is WY < PM CY. large visible was > According law metamorphic coals, aver...

Dissolution of a trapped non-aqueous phase liquid (NAPL) in soils and aquifers is a matter of great interest for the remediation of contaminated geological structures. In this work, the Volume Averaging Method is used to upscale the ``active dispersion'' phenomenon, taking into account both dispersion and dissolution of the NAPL. The method provides a macroscopic equation involving a dispersion...

The activated carbon was prepared from fast precarbonization of reed lignin in the fluidized-bed followed by K2CO3 activation. The impregnation ratio was = 1:1 in this research. The effect of activation temperature upon the BET specific surface area and specific pore volume of the carbon was closely investigated. Increasing activation temperature led to an opening and widening of the porous str...