The book presents the basic concepts of the theory of transient circuitry necessary for the development of a new element base of supercomputers of various types. The theory of transition circuitry is distinguished by a new component concept of synthesis of nanostructures, in which the minimum component for synthesis of circuits is not a transistor, but a material and a transition (connection) between materials. The data of experimental 2D and 3D modeling of physical and electrical processes in silicon transition nanostructures with a minimum topological size of 10-20 nm and comparative analysis of 4 types of circuitry are given The book can be recommended to researchers, Graduate students and engineers , specializing in the development of an element base of supercomputers and alternative computing systems, Bachelors and Masters , students in the specialties "Nanotechnology and microsystem technology" , "Electronics and Nanoelectronics" , "Computing Systems, Complexes and networks".