Estimation of parameters of motion of a moving sound source by digital processing of a set of Doppler-shifted underwater acoustic signals

A method is proposed for estimating the parameters of motion of a moving sound source on the basis of digital processing of Doppler-shifted underwater acoustic signals received by a set of hydrophones. A two-step approximation algorithm is used. An example of implementing the method of estimating the parameters of motion is presented for a two-hydrophone receiving system. Errors in estimating the parameters by means of the proposed method are considered.     

Elimination of Diurnal,Annual, and Solar Variations in the Matrix Observations of the URAGAN Muon Hodoscope

Physics of Atomic Nuclei - A method for elimination of periodical diurnal, annual, and 27-day and 11-year solar variations in the matrix observations of the URAGAN muon hodoscope was developed. The...     

Filtering of Trends with Forbush Effects of Time Series of Observations Performed by Cosmic-Ray Monitoring Systems

A method for filtering trends with Forbush effects of the time series of observations performed by cosmic-ray monitoring systems is proposed. A filtering algorithm based on sliding local models and weighted averaging is developed. A mathematical technique for optimizing the filter parameters is implemented. The results of observations from a neutron monitor are used as an example to test the developed filtering algorithm and estimate its efficiency.     

Yang-Mills-Higgs soliton dynamics in 2+1 dimensions

Dimensional reduction of the self-dual Yang-Mills equation in 2+2 dimensions produces an integrable Yang-Mills-Higgs-Bogomolnyi equation in 2+1 dimensions. For theSU(1,1) gauge group, a t'Hooft-like ansatz is used to construct a monopole-like solution and an N-soliton-type solution, which describes both the static deformed monopoles and the exotic monopole dynamics including a transmutation. How the monopole solution results from the twistor formalism is shown. Multimonopole solutions are commented on. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 117, No. 3, pp. 339–350, December, 1998.     

Effect of longitudinal aberration in an ion-optical system on the properties of a focused beam

Novosibirsk. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, No. 3, pp. 3–13, May – June 1994.     

Beam stability investigation for a free electron lithographic laser based on an energy-recovery linac

According to leading producers of microelectronic devices, lithography based on free electron lasers (FEL) could become the main technology for the mass production of elements with a scale up to 5 nm in the near future. One of the main hindrances in this path is the absence of working FEL with the required parameters. A feasibility study devoted to the production of such an FEL based on a superconducting energyrecovery linac (ERL) has been carried out at the Budker Institute of Nuclear Physics (BINP). The ERL average current is limited by longitudinal and transverse instabilities, caused by the interaction of an electron beam with the fields induced by it in the superconducting cavities. The estimations of the threshold currents and parameters of the ERL required for the operation of FEL are obtained.