Multi-element Josephson structures for implementing broadband devices

It is proposed the solution of an urgent problem of developing broadband superconducting devices via implementation of multi-element Josephson structures with an expanded dynamic range (due to the increase in the number of cells) and required high linearity of the transfer function of magnetic signal into voltage (due to the use of specially designed Josephson cells with a highly linear voltage response). Active electrically small antenna prototypes based on the proposed multi-element structures are experimentally studied.     

Statistical reconstruction of mixed states of polarization qubits

The method of estimating the adequacy, completeness, and accuracy of quantum tomography protocols is generalized to the case of mixed states of polarization qubits. The efficiency of the method is illustrated based on mathematical modeling and experimental investigation of some practically important quantum tomography protocols.     

Spaces of Type S and Deformation Quantization

Theoretical and Mathematical Physics - We study the properties of the Gelfand-Shilov spaces $$S_{a_k}^{b_n}$$ in the context of deformation quantization. Our main result is a characterization of...     

Radiative strength functions in odd-A spherical nuclei

The radiative strength functions for the partial γ-transitions from neutron resonances to the ground and low-lying states of odd-A spherical nuclei are calculated within the quasiparticle-phonon nuclear model. The fragmentation of one-quasiparticle and quasiparticle-plus-phonon states is calculated. This allowed one to calculate γ-transitions between the one-quasi-particle components (valence transitions) and γ-transitions between the quasiparticle-plus-phonon and one-quasiparticle components of the wave functions. The energy dependence of the strength functions $\text{C}$(E1, η) and $\text{C}$(M1, η) is calculated near the neutron binding energy B_n for ⁵⁵Fe and ^{59, 61}Ni. The corresponding experimental data are described qualitatively. The contribution of the valence E1 transitions to the strength function is shown to be from 20% to 90%, and M1 transitions about 1%. The influence of the M1 giant resonance is important for M1 transition probabilities.     

Catalytic Conversion of Ethanol Into 1,3-Butadiene: Achievements and Prospects: A Review

Theoretical and Experimental Chemistry - The results of the studies of the processes of catalytic conversion of ethanol to 1,3-butadiene during the last decade are summarized. Modern ideas about...     

Formation of a plasma with the determining role of radiative processes in thin foils irradiated by a pulse of the PEARL subpetawatt laser

A superbright X-ray source with a radiation temperature of ~1.2 keV making it possible to create a solid-state plasma whose kinetics is determined by the radiative processes has been implemented under the impact of a 170-TW pulse of the PEARL femtosecond laser facility on an aluminum target with submicron thickness. The diagnostics of the created plasma is performed by X-ray spectral methods using spectral transitions in hollow multicharged ions.     

Multimode Relativistic String: Classical Solutions and Quantization

We find all independent classical solutions for the three-mode Nambu–Goto string. We investigate the geometry of the closed curves obtained. Canonical quantization is performed for a part of the solutions obtained. We consider the spectrum of the quantum states obtained. It is consistent with the experimental masses and quantum numbers of mesons corresponding to glueballs. The leading Regge trajectory of the obtained states is consistent with the available data on the Pomeron trajectory.Deceased     

Generalized Weyl correspondence and Moyal multiplier algebras

We show that the Weyl correspondence and the concept of a Moyal multiplier can be naturally extended to generalized function classes that are larger than the class of tempered distributions. This generalization is motivated by possible applications to noncommutative quantum field theory. We prove that under reasonable restrictions on the test function space E ? L², any operator in L² with a domain E and continuous in the topologies of E and L² has a Weyl symbol, which is defined as a generalized function on the Wigner-Moyal transform of the projective tensor square of E. We also give an exact characterization of the Weyl transforms of the Moyal multipliers for the Gel??fand-Shilov spaces S _?? ^?? .