In nuclear reactors cooled by liquid metals, ultrasound is the only type of field that allows obtaining images of the reactor cores and diagnostics of the integrity of the fuel assemblies. The article discusses the fe...In nuclear reactors cooled by liquid metals, ultrasound is the only type of field that allows obtaining images of the reactor cores and diagnostics of the integrity of the fuel assemblies. The article discusses the features of the practical realization of ultrasonic imaging systems based on phased arrays and offers an alternative solution of imaging on the basis of the acoustic lenses of refractive and diffraction types. Using lenses eliminates many of the technical and technological problems associated with the development of multi-element phased arrays. It is shown that lens systems allow using traditional methods of transformation of acoustic fields into the visible images by 2D piezo matrix and a more promising way of acoustooptical transformation based on coherent optical interferometry.展开更多
It is shown that the estimation of nonlinear distortions in the various circuits based on the measurement of the ratio of the dispersion and correlation functions does not depend on the level of additive noise acting ...It is shown that the estimation of nonlinear distortions in the various circuits based on the measurement of the ratio of the dispersion and correlation functions does not depend on the level of additive noise acting on the input (or output) of nonlinear circuit. The proposed theoretical method is confirmed by experimental measurements.展开更多
A multidimensional interpretation of the emission spectrum of a hydrogen atom for the circular orbits of its electron is given. It is shown that the discreteness of the radiation frequencies and the angular momentum o...A multidimensional interpretation of the emission spectrum of a hydrogen atom for the circular orbits of its electron is given. It is shown that the discreteness of the radiation frequencies and the angular momentum of an electron for quasi-Bohr orbits are due to the periodicity of the motion, both in the projection to the observed three-dimensional space, permitting motion by inertia, and on additional space. The fine structure constant is represented as a simple function of the ratio of the radii of the orbits in the complementary and observed subspaces of the total space. The balance of forces acting on an electron in the corresponding subspaces allows one to find the electron Hamiltonian in orbits, the work of exit of the electron from an atom, and the emission spectrum of the atom.展开更多
基金This work was supported by grants fromthe National Natural Science Foundation of China(No.30470564,30670695)an international joint grantfromthe NSFC+1 种基金the Russian Foundation of Basic Research(NSFC:No.30611120056RFBR:No.05-04-39008)
文摘In nuclear reactors cooled by liquid metals, ultrasound is the only type of field that allows obtaining images of the reactor cores and diagnostics of the integrity of the fuel assemblies. The article discusses the features of the practical realization of ultrasonic imaging systems based on phased arrays and offers an alternative solution of imaging on the basis of the acoustic lenses of refractive and diffraction types. Using lenses eliminates many of the technical and technological problems associated with the development of multi-element phased arrays. It is shown that lens systems allow using traditional methods of transformation of acoustic fields into the visible images by 2D piezo matrix and a more promising way of acoustooptical transformation based on coherent optical interferometry.
文摘It is shown that the estimation of nonlinear distortions in the various circuits based on the measurement of the ratio of the dispersion and correlation functions does not depend on the level of additive noise acting on the input (or output) of nonlinear circuit. The proposed theoretical method is confirmed by experimental measurements.
文摘A multidimensional interpretation of the emission spectrum of a hydrogen atom for the circular orbits of its electron is given. It is shown that the discreteness of the radiation frequencies and the angular momentum of an electron for quasi-Bohr orbits are due to the periodicity of the motion, both in the projection to the observed three-dimensional space, permitting motion by inertia, and on additional space. The fine structure constant is represented as a simple function of the ratio of the radii of the orbits in the complementary and observed subspaces of the total space. The balance of forces acting on an electron in the corresponding subspaces allows one to find the electron Hamiltonian in orbits, the work of exit of the electron from an atom, and the emission spectrum of the atom.
