Non-conventional rule of making a periodically varying differentpole magnetic field in low-power alternating current electrical machines with using ring coils in multiphase armature winding

The paper presents methods of making a periodically varying different-pole magnetic field in low-power electrical machines. Authors consider classical designs of electrical machines and machines with ring windings in armature, structural features and calculated parameters of magnetic circuit for these machines

Status of the FLUTE RF System Upgrade

FLUTE (Ferninfrarot Linac- Und Test-Experiment) is a compact versatile linac-based accelerator test facility at KIT. Its main goal is to serve as a platform for a variety of accelerator studies and to generate strong ultra-short THz pulses for photon science. It will also serve as an injector for a Very Large Acceptance compact Storage Ring (VLA-cSR), which will be realized at KIT in the framework of the compact STorage Ring for Accelerator Research and Technology (cSTART) project. To achieve acceleration of electrons in the RF photoinjector and LINAC (from FLUTE) with high stability, it is necessary to provide stable RF power. For this goal, an upgrade of the existing RF system design has been proposed and is currently being implemented. This contribution will report on the updated RF system design and the commissioning status of the new RF system components

The SBP2 protein central to selenoprotein synthesis contacts the human ribosome at expansion segment 7L of the 28S rRNA.

SBP2 is a pivotal protein component in selenoprotein synthesis. It binds the SECIS stem-loop in the 3' UTR of selenoprotein mRNA and interacts with both the specialized translation elongation factor and the ribosome at the 60S subunit. In this work, our goal was to identify the binding partners of SBP2 on the ribosome. Cross-linking experiments with bifunctional reagents demonstrated that the SBP2-binding site on the human ribosome is mainly formed by the 28S rRNA. Direct hydroxyl radical probing of the entire 28S rRNA revealed that SBP2 bound to 80S ribosomes or 60S subunits protects helix ES7L-E in expansion segment 7 of the 28S rRNA. Diepoxybutane cross-linking confirmed the interaction of SBP2 with helix ES7L-E. Additionally, binding of SBP2 to the ribosome led to increased reactivity toward chemical probes of a few bases in ES7L-E and in the universally conserved helix H89, indicative of conformational changes in the 28S rRNA in response to SBP2 binding. This study revealed for the first time that SBP2 makes direct contacts with a discrete region of the human 28S rRNA

Calculation of inductances of stator’s windings in induction motor with ring windings by «ANSYS» and «ANSYS Maxwell»

In the paper algorithm for inductances calculation of stator windings in an induction motor with ring windings by «ANSYS» and «ANSYS Maxwell» is considered. The work presents the order of setting of the parameters required for the calculation in the model. In the course of the work, the basic expressions used by the programs for deriving matrices of inductances are determined, the results are analyzed, and recommendations are given to the user for carrying out such calculations.В статье рассматривается алгоритм расчета индуктивностей обмоток статора в асинхронном двигателе с кольцевыми обмотками с помощью прикладных программных пакетов «ANSYS» и «ANSYS Maxwell». В работе указывается порядок задания параметров в модели, необходимых для расчета. В ходе работы определяются основные выражения, используемые программами для вывода матриц индуктивностей, анализируются полученные результаты

Loss calculation of induction motor with ring windings by “ANSYS Maxwell”

The paper presents calculation methods for determining different loss type in electrical machine by “ANSYS Maxwell”. Authors give detailed instruction to the user for finding these parameters and describe the types of losses that are put into the program by the developers

A novel insight into the mechanism of mammalian selenoprotein synthesis

IThe amino acid selenocysteine is encoded by UGA, usually a stop codon, thus requiring a specialized machinery to enable its incorporation into selenoproteins. The machinery comprises the tRNASec, a 3′-UTR mRNA stemloop termed SElenoCysteine Insertion Sequence (SECIS), which is mandatory for recoding UGA as a Sec codon, the SECIS Binding Protein 2 (SBP2), and other proteins. Little is known about the molecular mechanism and, in particular, when, where, and how the SECIS and SBP2 contact the ribosome. Previous work by others used the isolated SECIS RNA to address this question. Here, we developed a novel approach using instead engineered minimal selenoprotein mRNAs containing SECIS elements derivatized with photoreactive groups. By cross-linking experiments in rabbit reticulocyte lysate, new information could be gained about the SBP2 and SECIS contacts with components of the translation machinery at various translation steps. In particular, we found that SBP2 was bound only to the SECIS in 48S pre-initiation and 80S pretranslocation complexes. In the complex where the Sec-tRNASec was accommodated to the A site but transpeptidation was blocked, SBP2 bound the ribosome and possibly the SECIS element as well, and the SECIS had flexible contacts with the 60S ribosomal subunit involving several ribosomal proteins. Altogether, our findings led to broadening our understanding about the unique mechanism of selenocysteine incorporation in mammals

The influence of the dislocation distribution heterogeneity degree on the formation of a non-misoriented dislocation cell substructures in f.c.c. metals

Dislocation loops emitted by Frank-Reed source during crossing dislocations of the non-coplanar slip systems are accumulates jogs on the own dislocation line, resulting in the deceleration of the segments of dislocation loops with high jog density. As a result, bending around of the slowed segments the formation of dynamic dipoles in the shear zone occurs. In the present paper we consider formation mechanism of non-misoriented dislocation cell substructure during plastic deformation of f.c.c. metals and conclude that the increase in the degree heterogeneity of dislocation distribution leads to an increase in the jog density and reduce the mean value of arm dynamic dipoles

Studing of the damper winding influence on the synchronous machine work in asymmetrical modes in «ANSYS Maxwell»

В статье рассматривается влияние демпферной обмотки на работу синхронного генератора в режиме однофазного короткого замыкания. В симметричных режимах поле якоря вращается синхронно с ротором и не наводит токи в данной обмотке. Однако при переходных процессах вращение поля якоря становится несинхронным, что приводит к протеканию токов в стержнях демпферной обмотки. Переходные процессы приводят к раскачиванию синхронной машины. Демпферная обмотка необходима для устранения электромеханических колебаний. Программа «ANSYS Maxwell» позволяет смоделировать такие режимы и оценить влияние данной обмотки на процессы в машине.The article is considered the damper winding impact on the synchronous generator work in a single-phase short circuit mode. In symmetrical modes the armature field rotates synchronously with the rotor, it doesn’t induce currents in the damper. However in transient mode field rotation becomes non-synchronous, due to currents flow in the bars of the damper winding. Transient modes lead to rocking of the synchronous machine. Damper winding is needed to eliminate electromechanical oscillations. The «ANSYS Maxwell» program allows to model such regimes and to estimate the impact of the damper on the processes in the machine

The using and analysis of the ANSYS software application at the course design of synchronous motors by students of "Power and electrical engineering" direction, "Elechtromechanics" profile, "Bachelor" qualification

В статье приведены результаты расчета синхронного двигателя классической конструкции в пакете ANSYS. Приведены рисунки построенной и разбитой на конечные элементы модели синхронной машины и распределения магнитного поля по различным участкам магнитной цепи электрической машины. Также дана оценка целесообразности изучения данного пакета при обучении студентов квалификации «Бакалавр» по направлению «Электромеханика».Classical design synchronous motor calculation results obtained using ANSYS package are presented in the paper. Pictures of the set and meshed model and magnetic flux distribution along various magnetic circuit areas are shown. ANSYS package studying expediency appraisal for electromechanical bachelor course is also provided