The effect of a homogeneous temperature field on the frequencies of natural oscillations of a circular sandwich plate is investigated. The hypothesis of a broken line is used as a kinematic one: for identical high-strength thin load-bearing layers. the Kirchhoff hypothesis; for a light incompressible thicker filler. the Timoshenko hypothesis on the straightness and incompressibility o... http://megavitamines.shop/product-category/amino-acid/