The connectivity and tortuosity of fluid-filled pore networks in the water air phases strongly influence mass transport porous media. Moisture conditions (water content distribution) alter water- or air-filled networks. In this study, using a sand column with variable saturated conditions, were analyzed X-ray computed tomography (CT). Water parameters, including hydraulic conductivity, gas diff...

Abstract. The active fraction of soil organic carbon is an important component health and often quickly assessed as the pulse CO2 released by re-wetting dried soils in short-term (24–72 h) assays. However, can lose (C) they dry and, if samples vary moisture content at sampling, differential C loss during pre-assay dry-down period may complicate assay's interpretations. We examined impact a long...

Diffusion MRI (DMRI) comprises a growing list of methods, and with that the need for a reliable and robust MRI phantom with which one can calibrate and validate them. In this study we developed a novel anisotropic diffusion MRI phantom and demonstrated its applicability by producing fractional anisotropy (FA) maps derived from DTI and average pore diameter maps using double Pulsed Field Gradien...

The interior pore of open-cell aluminium foams filled with bronze is a new method preparing composite. voids were fabricated by in situ thermal decomposition space-holder powder metallurgical sintering process. Cu3Sn phase content observed to increase through transformation at the expense Cu6Sn5 and aluminium-matrix during isothermal aging. effect porosity on interface microstructure between fi...

We carried out spectral-induced polarization (SIP) measurements on a set of dried seafloor massive sulfide samples and compared the results with those obtained same fully saturated NaCl solution. find that conductivity polarizability are generally high for both samples, i.e., exhibiting phase shifts in order 100 s mrad imaginary conductivities up to 1 S/m. Depending particular sample, polarizab...

Abundant geological, seismological and experimental evidence of the heterogeneous structure of natural faults motivates the theoretical and computational study of the mechanical behavior of heterogeneous frictional interfaces. Fault zones are composed of a mixture of materials with contrasting strength, which may affect the spatial variability of seismic coupling, the location of high-frequency...

We consider the following experiment. A container is filled with a suspension consisting of particles immersed in an incompressible liquid. An opening is made on the container wall and the suspension flows through the opening. We develop a mathematical model to compute the expected volume of suspension extracted before particles clog the opening. Our studies are relevant to the understanding of...

proving the validity of the present numerical approach. The results were also compared to the FEM simulations made by White et al. The ion current rectification in the pore of 10 μm length and half-cone angle of 12°, filled with 1 mM KCl solution was simulated. In this case the rectification ratio r(E) 35 is 1.39, while White et al report 1.38. The tiny difference in the obtained result is prob...

The potassium channel from Streptomyces lividans is an integral membrane protein with sequence similarity to all known K+ channels, particularly in the pore region. X-ray analysis with data to 3.2 angstroms reveals that four identical subunits create an inverted teepee, or cone, cradling the selectivity filter of the pore in its outer end. The narrow selectivity filter is only 12 angstroms long...

Many molecular glass forming liquids show a shift of the glass transition Tg to lower temperatures when the liquid is confined into mesoporous host matrices. Two contrary explanations for this effect are given in literature: First, confinement induced acceleration of the dynamics of the molecules leads to an effective downshift of Tg increasing with decreasing pore size. Second, due to thermal ...