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The paper presents experiments on developing new materials with preset properties for the footwear area, particularly for customized footwear. Research focused on analyzing a rubber plate formulation for heel tops commonly used in footwear manufacturing, varying the amount of filler and expanding agent in different proportions to obtain physico-mechanical properties appropriate for use. In this paper, the purpose of research was developing customized footwear by reducing the Fy mediolateral component of the ground reaction force when the foot touches the ground during walking. Developing customized footwear taking into account ground reaction force aims to improve walking or static position. In order to fulfill its role, footwear must reduce the Fy mediolateral component of the ground reaction force. Lately, reducing ground reaction force has been a major concern in footwear design and manufacturing. Ground reaction is measured using AMTI’s AccuGait System force plate. Keywords: cured rubber, customized footwear, ground reaction, force platform

The aim of this paper is the study of the influence of some solvents on the electronic absorbtion spectra of B12 vitamin by using the cell model of pure liquid proposed by Takehiro Abe. The radius of the first and second solvatation sphere, the number of particles from the first two solvatation sphere were calculated and then it was estimated the potential interaction by dispersion forces between the spectrally active molecule (vitamin B12) and the solvent molecules which surrounded it. The linear dependence between a and b Abe coefficients permits to estimate the polarizability and the dipole moment of the spectrally active molecule (B12 vitamin) in the first excited state. Some electrical parameters were calculated after Langevin dynamics applied to investigate system. Keywords: Vitamin B12, electronic absorbtion spectra, polarizability in the electronic state, Langevin dynamics, total energy