Abtract The Mg +2 accumulation on the exchange complex of soils to a very high saturation levels affect their chemical, physical and biological properties. Magnesium has some capacity to develop higher exchangeable sodium levels in clays and soil materials. Colombia has a large area of these soils, located mainly in the main rivers valleys and in the Caribbean Region. In the Cauca River Valley ...

Abstract On Mars, condensation is the major factor constraining vertical distribution of water vapor. Recent measurements and temperature profiles showed that can be strongly supersaturated at above level where clouds form during aphelion perihelion seasons. Since 2018, near‐infrared spectrometer (NIR) Atmospheric Chemistry Suite onboard Trace Gas Orbiter has measured H 2 O using solar occultat...

Improving our understanding of the relation between water content and seismic signatures unconsolidated superficial soils is an important objective in overall field hydrogeophysics. Current approaches to constrain vadose zone from data are based on computing ratio compressional shear wave velocities Vp/Vs. While this allows for detection pronounced changes saturation, such as groundwater table,...

This paper is concerned with the simultaneous flow of liquid water and gaseous reactants in mini-channels of a proton exchange membrane PEM) fuel cell. Envisaging the mini-channels as structured and ordered porous media, we develop a continuum model of two-phase channel ow based on two-phase Darcy’s law and the M2 formalism, which allow estimate of the parameters key to fuel cell operation such...

Populations of jellyfish are known to thrive in many low oxygen environments, however, the physiological mechanisms that permit these organisms to live in hypoxia remain unknown. The oxyregulatory abilities of four species of scyphomedusae were investigated, and it was found that Aurelia labiata, Phacellophora camtschatica, Cyanea capillata and Chrysaora quinquecirrha maintain steady oxygen con...

In this paper we present a new experimental setup combining laboratory high resolution computed micro-tomography (MCT) with a flow microcell specially designed to reproduce in-situ multiphase flow experiments and monitor the fluid distribution at the pore scale. The objective is to describe the fluid saturations and distribution at different steps of the capillary pressure cycle (drainage and i...

The heat-shock responses of barley (Hordeum vulgare L. cv Hi- malaya) aleurone layers incubated with or without gibberellic acid (GA3) were compared. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed that heat shock blocked the synthesis and secretion of secretory proteins from GA3-treated layers but not untreated layers. This suppression of secretory protein synthesis has been...

Introduction: With the advent of parallel transmit (PTx), there has been much interest in creating complex spatially localised excitations. The algorithms which calculate the requisite pulses [1,2] require an estimate of the B1 field produced by each coil, and also a map of the B0 (off resonance) field, since this distorts the excited magnetisation profiles. In fact spatially localized excitati...

The problem addressed in this article is image indexing and retrieval according to the color. Indeed we propose a classification based on the dominant color(s) of the images. The process consists in two steps: first, assigning a colorimetric profile to the image in HLS space (Hue, Lightness, Saturation) and then, handling the query for the retrieval. To achieve the first step, the definition of...