Phase-shifted Andreev levels in an altermagnet Josephson junction

We compute the effect of a d-wave magnetization (altermagnetism) on the spectrum of bound states (Andreev levels) in a junction between two s-wave superconductors (gap $\Delta_0$, phase difference $\phi$). Compared to a nonmagnetic junction, the $\phi$-dependence of the spectrum is shifted by an offset $\pm\delta\phi$, dependent on the spin direction, so that the Andreev levels become spin-polarized. In a planar junction, oriented along the crystalline axis of $d_{xy}$-wave symmetry, the excitation energies are determined by the normal-state transmission probability $T$ according to $E=\Delta_0\sqrt{1-T\sin^2\tfrac{1}{2}(\phi\pm\delta\phi)}$. We calculate the corresponding Josephson energy and supercurrent, recovering the 0-$\pi$ transition of related studies.Comment: 7 pages, 8 figure

Bloch oscillations in the magnetoconductance of twisted bilayer graphene

We identify a mapping between two-dimensional (2D) electron transport in a minimally twisted graphene bilayer and a one-dimensional (1D) quantum walk, where one spatial dimension plays the role of time. In this mapping, a magnetic field B perpendicular to the bilayer maps onto an electric field. Bloch oscillations due to the periodic motion in a 1D Bloch band can then be observed in purely DC transport as magnetoconductance oscillations with periodicity set by the Bloch frequency.Theoretical Physic

Rechnerunterstützte analytische Ermittlung der Kapazität von Eisenbahnnetzen

Scientific studies of railway facilities are hardly conceivable today without electronic data processing. With modern technical aids the quality and performance characteristics can be precisely determined for railroad lines, stations and route nodes. This publication deals with a concept for a new analytical software system and takes into account the newest scientific achievements and the current state of computing techniques. The presented concept is based on the Queuing theory of operations research and used for the quantification of scheduled waiting time and dispatching delays within the railway network. Network is partitioned into investigation areas section route nodes and total route nodes. The corresponding software system ANKE (abbreviation for Analytic Network Capacity Determination) is used as a standard infrastructure investigation tool by the German Railways

Rechnerunterstützte analytische Ermittlung der Kapazität von Eisenbahnnetzen

Scientific studies of railway facilities are hardly conceivable today without electronic data processing. With modern technical aids the quality and performance characteristics can be precisely determined for railroad lines, stations and route nodes. This publication deals with a concept for a new analytical software system and takes into account the newest scientific achievements and the current state of computing techniques. The presented concept is based on the Queuing theory of operations research and used for the quantification of scheduled waiting time and dispatching delays within the railway network. Network is partitioned into investigation areas section route nodes and total route nodes. The corresponding software system ANKE (abbreviation for Analytic Network Capacity Determination) is used as a standard infrastructure investigation tool by the German Railways

Rechnerunterstuetzte analytische Ermittlung der Kapazitaet von Eisenbahnnetzen

Available from TIB Hannover: RA 2508(59) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

NATURAL INNOVATIONS – FOR QUALITY OF LYCEUM EDUCATION

The analysis of experience of the use of natural technologies harmonizing the functional systems of organism of students is Given. The results of the use of innovative grounds are shown: «In-separate education and educating», «Gender model of realization of EDU. Standard», «Integrative methods of educating and education». As a result of innovative activity improved quality train of schoolchildren with the different level of capabilities on condition of maintenance of their physical and psychical health

Breathing mode in open-orbit magnetotransport: A magnetic lens with a quantum mechanical focal length

We consider the propagation of electrons in a lattice with an anisotropic dispersion in the x-y plane (lattice constant a), such that it supports open orbits along the x axis in an out-of-plane magnetic field B. We show that a point source excites a "breathing mode,"a state that periodically spreads out and refocuses after having propagated over a distance ?=(eaB/h)-1 in the x direction. Unlike known magnetic focusing effects, governed by the classical cyclotron radius, this is an intrinsically quantum mechanical effect with a focal length. </p

Proportional counters aged anode wire recovering using an 80%CF4 + 20%CO2 gas mixture

A technique to recover a gas proportional counter having an aged anode wire using a glow discharge in an 80%CF4 + 20%CO2 gas mixture has been developed and tested. Studies of aging effects were carried out under sustained irradiation by an intense 90Sr -source of the straw proportional counters operated with a 60%Ar + 30%CO2 + 10%CF4 gas mixture. Special attention was paid to the aging mechanism of the anode wires. Our experience showed that using a given gas mixture the swelling of the anode wires is a typical mode of aging that leads to degradation of the gas gain. The proposed method of recovery provided a complete restoration of the gas gain and the signal amplitude in the damaged zone of the wire. SEM/XEM analysis confirmed successful cleaning WOx deposits from the wire surface. The application of this method to recover the aged gaseous detectors in real experimental conditions is discussed