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Electromagnetic solids with irreversible process of local mass displacement

Kondrat V., Hrytsyna O.

Archives of Mechanics

2011

Vol. 63, nr 3

255-255

The non-local model of electromagnetothermomechanics for polarized nonferromagnetic solids is proposed. It takes into account the process of local mass displacement due to structural changes of a physically small element of a body. An approach which takes into account possible irreversibility of the local mass displacement is also proposed. On this basis, we have obtained the rheological constitutive relations for the vectors of the mass displacement and for the polarization. The proposed model allows to study the surface charge kinetics and the formation of near-surface inhomogeneities of the stress-strained state as well as the electric polarization, surface tension and disjoining pressure.

On electromechanical phenomena in thin dielectric films

Chaplya Y., Kondrat S., Hrystyna O., Kondrat V.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2009

Vol. 13, No 1-2

145-154

A model of electro-magneto-thermo-mechanics for electroconducting polarized nonferromagnetic medium is proposed which takes into account the local mass displacement in addition to the local electric charge displacement. The corresponding key set of equations is written. Using the isothermal approximation, the model is applied to describe the interface inhomogeneity of a stressed state, the polarization and coupled electric charge in thin dielectric films. An anomalous dependence of the electric capacity on the thickness of a thin dielectric film, observed experimentally by Mead, is also studied and is shown to be well captured by the present approach.

Wettability versus hydrophilicity

Grodzka J., Pomianowski A.

Physicochemical Problems of Mineral Processing

2006

Vol. 40

5-18

Basing on recent works we discuss the issue relating wetting and hydrophilicity pointing out the topics enabling a fast progress in this area. Wetting is a phenomenon that is still the subject of intensive studies, both pure and applied. However, precise definitions of its molecular basis are still lacking and the static and dynamic macroscopic parameters should also be defined. An important role seems to be played by profound investigation on relaxation times of the primary elemental steps of the joined chemical and mechanical processes.

Opierając się na najnowszych pracach oryginalnych i przeglądowych, omówiliśmy podstawowe zagadnienia hydrofilowości i zwilżalności. Wskazaliśmy problemy, których rozwiązanie umożliwi szybkie postępy w tej dziedzinie. Zwilżalność należy do zjawisk o dużym znaczeniu, zarówno poznawczym, jak i praktycznym. Potrzebne jest sprecyzowanie definicji stosowanych pojęć i skali ich wartości. Należy dokładnie określić skalę zmian struktury wody, zarówno w pobliżu rozpuszczonych w niej cząsteczek, jak też w nanometrycznych oraz mikroskopowych obszarach granic międzyfazowych.