An electromagnetic generator of focused shock waves with a coaxial radiator excited by the axial current

The device hereafter described forms focused acoustic pressure pulses excited by a pulsed magnetic field affecting a cylindrical shell. A specific feature of the instrument is its coaxial radiator connected to a capacitive storage through a pulse transformer with a single-turn secondary winding that is used to excite the acoustic pulse. Design versions of the coaxial radiator are considered and estimates for setting design parameters are presented along with the test results obtained on a prototype model. The device can be used in shock-wave medical apparatuses for fragmentation of nephroliths and gall-stones.     

Phase transitions in confined nanoparticles

Recently a great deal of attention in solid state physics was paid to studies of size effects on properties of materials.     

Finite-length scaling of turbo-like code ensembles on the binary erasure channel

A possibility of estimating the finite-length performance of sparse-graph code ensembles gives two opportunities: to compare different codes of the same length in a context very close to real, practical applications and to perform the parameter optimization for a given code length [2]. We need a finite-length approximation that is valid for any code ensemble. The scaling approach seems to be a tool, general enough to provide such an approximation. However, the analytical derivation of parameters of the scaling approximation has been successful only for LDPC codes [1]; despite several attempts [25], [20], no such result was proposed for other code ensembles. In this paper, we focus on the finite-length performance of turbo-like codes, by applying the scaling approach to this case. In particular, by assuming the transmission over the binary erasure channel, we conjecture the scaling law and derive its scaling parameter. As examples, we present the performance estimation for Repeat-Accumulate codes [11], parallel turbo codes [8] and TLDPC codes [5], in all cases matching well the numerical results.     

Phase transitions in confined nanoparticles

Recently a great deal of attention in solid state physics was paid to studies of size effects on properties of materials.……