The purpose of the article is to identify patterns of change in the properties of biocompatible coatings during modernization of its structure by changing the morphology and crystallinity of the starting powder particles of hydroxyapatite (HA) for agglomeration and subsequent grinding. Material and methods. We investigated the morphology, degree of crystallinity and internal tension in HA powder with a particle size of 40-90 microns in the initial state and after the agglomeration process and structure piasmasprayed HA coatings application methods ray analysis (XRF and XRD) on DRON-3, infrared spectroscopy (FT-IR spectrometer Nicolet 6700), optical (MIM-8) and atomic force microscopy (SMM-2000), the laser microprobe (Spectrum 2000). Results: It was shown that change in particle morphology HA agglomerated and subsequently grinding increases the uniformity of the porous structure, its crystallinity, reduce internal stresses developing surface morphology of the coating and its nanostructuring. Conclusion. It is recommended for the improvement of characteristics of the porous structure (uniformity, strength, adhesion), and the surface morphology of implant to use agglomerating starting powders and their subsequent grinding.
Melnikova I.P., Lyasnikova A.V., Lyasnikov V.N. Particle morphology of hydroxyapatite and its influence on the properties of biocomposite plasma coatings // Saratov Journal of Medical Scientific Research, Vol. 9, Issue 3, 2013, pp. 441-445

The paper is devoted to improvement of technique of designing of bearing structure of track machines bodies. The review and analysis of state-of-the-art of the mathematical programming theory and the optimal designing are done. The numerical optimization procedure for bearing structures of track machines bodies is proposed. The approbation of the proposed procedure is taken on the number of problems of structural optimization. The number of the mathematical aspects of implementation of the proposed procedure are investigated, particularly the algorithm convergence and the sensitivity analysis of initial designs. The deflected mode of the bearing structure of body of the ballast leveling machine SPZ-5/UA was investigated analytically (FEM study) and experimentally (trial running inspection on durability). The necessity of implementation of optimization of bearing structures of bodies is substantiated. The rational design of bearing structure of track machine SPZ-5/UA was obtained with the numerical optimization procedure proposed in the paper. The deflected mode of the rational bearing structure of body was investigated.