The paper considers the class of Hamiltonian systems with two degrees of freedom.Based on the classical normal form, according OPTIONS_HIDDEN_PRODUCT to the rules of Born-Jordan and Weyl-MacCoy, its quantum analogs are constructed for which the eigenvalue problem is solved and approximate formulas for the energy spectrum are found.For particular va
The article discusses a new model of the origins of choral singing in the context of human evolutionary history.Hominid interaction with predators is seen as a crucial force in the evolution Hard Tops of human morphology and behaviour.Group singing and dancing, with body painting and the use of masks, are perceived as critical elements of the strat
The literature dealing with the electrochemical corrosion of copper and possibility of its prevention using inhibitors is examined.Inorganic compounds are investigated as well, but organic compounds and their derivatives in Media Chests much greater numbers.Researches are directed to influence of compounds structure, concentration, method of applic
Calculating the value of wood in forests has always been a job full of challenges for the appraiser, especially if in that case the condition is not to cut down trees.As one of the possibilities, the method of "model" cutting can be used, which is practically the only one that allows assessment value without cutting trees.It consists in estimating