To investigate factors influencing nucleation of air clathrate hydrates in polar ice sheets, we have performed high-resolution mapping of the distributions of soluble impurities, air bubbles and airhydrate crystals versus depth in the Dome Fuji Antarctic ice. Significant correlation observed between the concentrations of air inclusions and impurities in ice along with frequent occurrence of imp...

Within the nonlinear micropolar elasticity we discuss effective dynamic (kinetic) properties of elastic networks with rigid joints. The model a hyperelastic continuum is based on two constitutive relations, i.e. static and kinetic ones. They introduce strain energy density density, respectively. Here consider three-dimensional network made three families fibers connected through massive So are ...

A new treatment concept for drinking water production from surface water has been investigated on a pilot scale. The treatment concept consists of fluidized ion exchange (FIEX), ultrafiltration (UF), nanofiltration (NF), and granular activated carbon filtration (GAC). The FIEX process removed calcium and other divalent cations; the UF membrane removed particles and micro-organisms; and the NF m...

in the present work, a modified correlation is presented for the second virial coefficients of both polar and nonpolar fluids based on the corresponding states principle. the second virial coefficients of gaseous polar and non-polar compounds were calculated and compared with experimental data and with other correlations. comparisons with the existing correlations show that the present work is ...

Liquid salty micro-channels (brine) between growing ice platelets in sea ice are an important habitat for CO2-binding microalgaea with great impact on polar ecosystems. The structure formation of ice platelets is microscopically described and a phase field model is developed. The pattern formation during solidification of the two-dimensional interstitial liquid is considered by two coupled orde...

The paper focuses on the numerical analysis of the effect of texturial anisotropy on shear localization in cohesionless granular materials. For simulation of the mechanical behavior of a granular material during a monotonous deformation path, a hypoplastic constitutive model was used. To take into account a characteristic length of micro-structure, the constitutive model was extended by micro-p...

This project takes its cue from field experiments, mostly from the Arctic Summer Cloud Ocean Study (ASCOS), which was a summer expedition on the Swedish icebreaker Oden during the summer of 2008 as part of the International Polar Year, and a new expedition scheduled for the summer of 2014, also on the icebreaker Oden: the Arctic Cloud in Summer (or ACSE) experiment, which is a part of a larger ...

The behaviour of dry and cohesionless sand body in a cyclic interface shear box test under a constant normal stiffness (CNS) condition is numerically studied. Do this end finite element calculations are carried out using a micro-polar hypoplastic model, where the mean grain diameter of the sand material is used as a characteristic length of the micro-structure. The constitutive equations for th...