On Landauer--B\"uttiker formalism from a quantum quench

We study transport in the free fermionic one-dimensional systems subjected to arbitrary local potentials. The bias needed for the transport is modeled by the initial highly non-equilibrium distribution where only half of the system is populated. Additionally to that, the local potential is also suddenly changed when the transport starts. For such a quench protocol we compute the Full Counting Statistics (FCS) of the number of particles in the initially empty part. In the thermo\-dynamic limit, the FCS can be expressed via the Fredholm determinant with the kernel depending on the scattering data and Jost solutions of the pre-quench and the post-quench potentials. We discuss the large-time asymptotic behavior of the obtained determinant and observe that if two or more bound states are present in the spectrum of the post-quench potential the information about the initial state manifests itself in the persistent oscillations of the FCS. On the contrary, when there are no bound states the asymptotic behavior of the FCS is determined solely by the scattering data of the post-quench potential, which for the current (the first moment) is given by the Landauer--B\"uttiker formalism. The information about the initial state can be observed only in the transient dynamics

Effective free-fermionic form factors and the XY spin chain

We introduce effective form factors for one-dimensional lattice fermions with arbitrary phase shifts. We study tau functions defined as series of these form factors. On the one hand we perform the exact summation and present tau functions as Fredholm determinants in the thermodynamic limit. On the other hand simple expressions of form factors allow us to present the corresponding series as integrals of elementary functions. Using this approach we re-derive the asymptotics of static correlation functions of the XY quantum chain at finite temperature

Large Broadening of the Superconducting Transition by Fluctuations in a 3D Metal at High Magnetic Fields: The MgB2_{2} case

It is shown that the transition to the low temperature superconducting state in a 3D metal at high magnetic field is smeared dramatically by thermal fluctuation of the superconducting order parameter. The resulting superconducting-to-normal crossover occurs in a vortex liquid state which is extended well below the mean-field $H_{c2}$. Application to MgB$_{2}$ yields good quantitative agreement with recently reported data of dHvA oscillation in the superconducting state

Dissipative dynamics of vortex arrays in anisotropic traps

We discuss the dissipative dynamics of vortex arrays in trapped Bose-condensed gases and analyze the lifetime of the vortices as a function of trap anisotropy and the temperature. In particular, we distinguish the two regimes of the dissipative dynamics, depending on the relative strength of the mutual friction between the vortices and the thermal component, and the friction of the thermal particles on the trap anisotropy. We study the effects of heating of the thermal cloud by the escaping vortices on the dynamics of the system.Comment: RevTeX, 8 pages, 3 eps figure

Robot-assisted laparoscopic radical prostatectomy using «da Vinci®» system

This study reveals the data about performed radical prostatectomy using the robot system da Vinci®. Advantages of using this system in comparison with traditional operations are grounded. From 2008 in the urology clinic of the Ural State Medical Academy, the regional clinical hospital №1 22 robot-assisted radical prostatectomy have been made. Using the robot system da Vinci® provides the short term of medical treatment and hospital stay, early working rehabilitation and reducing postoperative complications. 3D-visualization of the surgical field provides better orientation in limited space and raises the quality of complicated operative measures along with fewer efforts of medical staff.В работе представлены данные о выполненных радикальных простатэктомиях с использованием роботизированной системы da Vinci®. Обоснованы преимущества использования данной методики в сравнении с традиционной операцией. В клинике урологии УГМА при ГУЗ «С0КБ№1» с 2008г. выполнено 22 робот-ассистированных радикальных простатэктомий. Использование роботизированной системы da Vinci® способствует сокращению пребывания больных в стационаре, ранней трудовой реабилитации и снижению послеоперационных осложнений. Трехмерная визуализация операционного поля способствует лучшей ориентации в ограниченном пространстве, более качественному выполнению сложных оперативных вмешательств при меньших физических затратах операционной бригады

State Capitalism in Russia: A Review Article (Part 1)

The article reviews current scholarship and debates on state capitalism as well as studies of this phenomenon in Russia.Aim. This article aims to review current scholarly debates on state intervention in the Russian economy and identify key positions in this field.Tasks. In the first part of the article, we reveal the history of the concept of ‘state capitalism’ and review debates on the ‘new state capitalism’, its developmentalist, political, social and other interpretations.Methods. This article compares scholars’ positions and identifies divisions in the field.Results. In the first part of the article, we demonstrate that the concept of ‘state capitalism’ has been discussed in the Marxist tradition since the late 19th century. However, the crisis of 2008-2009 marked the renewal of mainstream interest in this phenomenon. There are several interpretations of state capitalism. Industrial policy view treats state capitalism as a way of stimulating economic growth and technological development. Social policy view considers it to be an instrument of solving social problems, such as unemployment and high prices on certain goods and services. Political view envisions state capitalism as a vehicle for rent-seeking and patronage. Geopolitical view treats it as an instrument of foreign policy and the defense of national sovereignty. State capitalism is also seen as a vehicle for financialization and globalization. State capitalism is studied both on the microlevel of specific industries, regions and projects, and on the macrolevel of the national economies.Conclusion. Current debates on state capitalism comprise a dynamic, multidisciplinary research field. Within this field, the Russian case should be investigated in the comparative perspective

State Capitalism in Russia: A Review Article (Part 2)

The article reviews current scholarship and debates on state capitalism as well as studies of this phenomenon in Russia.Aim. This article aims to review current scholarly debates on state intervention in the Russian economy and identify key positions in this field.Tasks. In the second part of the article, we review the existing research on state capitalism in Russia.Methods. This article compares scholars’ positions and identifies divisions in the field.Results. In the second part of the article, we show that, since the early 2000s, Russia was widely seen as a paradigmatic case of the state’s return to interventionist policies. We demonstrate that the first wave of studies in the 2000s, with a few exceptions, considered state capitalism in Russia to be an instrument of patronage and rent-seeking. However, subsequent research questioned this claim. State capitalism in Russia was now seen as an instrument of solving social problems, particularly in monotowns, a geopolitical tool and a way of defending national sovereignty, as well as a vehicle for financialization.Conclusion. Multiple empirical studies of state capitalism in Russia published in the 2010s demonstrate its complexity and versatility. However, the results of empirical research are yet to be systematized and the Russian political economy still lacks a macro analysis that would consider all of its structural and institutional dimensions