Solidarität in Bewegung(en)

Alle reden von Solidarität. Was macht Solidarität aus, wenn sie über die konkrete Hilfestellung in Alltagssituationen hinausweisen soll - hin zu einer universalen, in Kämpfen erfahrene und gelebte Wirklichkeit? Erinnern als solidarische Praxis: Mit dem Bezug auf vergangene Erfahrungen wird ein solidarisches Rüstzeug für heutige Kämpfe entwickelt. Solidarität als kollektive Bearbeitung von sozialen Ungleichheiten stärkt eine spezifische klassenbewusste Solidarität nach innen, zwischen den Marginalisierten. Solidarität schließt ein, Beziehungen zwischen Subjekten herzustellen, die sich gar nicht persönlich kennen, die zeitlich oder räumlich voneinander getrennt sind.Everyone is talking about solidarity. But what is solidarity if it is to go beyond tangible assistance in everyday situations - towards universal solidarity as something one learns and experiences in daily struggles and concrete reality? Remembrance as a solidarity practice: The reference to past experiences allows us to develop an armor of solidarity for current struggles. Solidarity in the sense of collectively addressing social inequalities strengthens a specific class-conscious solidarity between marginalized people. Solidarity also involves establishing relationships between subjects who do not know each other personally, who are separated in time or space

Temperature and differential emission measure evolution of a limb flare on 13 January 2015

Context. Spatially unresolved observations show that the cooling phase in solar flares can be much longer than theoretical models predict. It has not yet been determined whether this is also the case for different subregions within the flare structure. Aims. We aim to investigate whether or not the cooling times, which are observed separately in coronal loops and the supra-arcade fan (SAF), are in accordance with the existing cooling models, and whether the temperature and emission measure of supra-arcade downflows (SADs) are different from their surroundings. Methods. We analysed the M5.6 limb flare on 13 January 2015 using SDO/AIA observations. We applied a differential emission measure (DEM) reconstruction code to derive spatially resolved temperature and emission measure maps, and used the output to investigate the thermal evolution of coronal loops, the SAF, and the SADs. Results. In the event of 13 January 2015, the observed cooling times of the loop arcade and the SAF are significantly longer than predicted by the Cargill model, even with suppressed plasma heat conduction. The observed SADs show different temperature characteristics, and in all cases a lower density than their surroundings. Conclusions. In the limb flare event studied here, continuous heating likely occurs in both loops and SAF during the gradual flare phase and leads to an extended cooling phase

Observatories of the Solar Corona and Active Regions (OSCAR)

Coronal Mass Ejections (CMEs) and Corotating Interaction Regions (CIRs) are major sources of magnetic storms on Earth and are therefore considered to be the most dangerous space weather events. The Observatories of Solar Corona and Active Regions (OSCAR) mission is designed to identify the 3D structure of coronal loops and to study the trigger mechanisms of CMEs in solar Active Regions (ARs) as well as their evolution and propagation processes in the inner heliosphere. It also aims to provide monitoring and forecasting of geo- effective CMEs and CIRs. OSCAR would contribute to significant advancements in the field of solar physics, improvements of the current CME prediction models, and provide data for reliable space weather forecasting. These objectives are achieved by utilising two spacecraft with identical instrumentation, located at a heliocentric orbital distance of 1 AU from the Sun. The spacecraft will be separated by an angle of 68° to provide optimum stereoscopic view of the solar corona. We study the feasibility of such a mission and propose a preliminary design for OSCAR

Ueber einige Anwendungsweisen des faradischen Stromes in der Gynäkologie 2 )

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ZeroCopy: Techniques, Benefits and Pitfalls

Abstract: We discuss various approaches intended to improve the data processing performance in OS kernels/drivers commonly described as ZeroCopy techniques. The main principle of ZeroCopy is to avoid completely or at least minimize unnecessary data copy operations by the CPU while processing I/O data in kernel drivers such as networking stacks and disk storage drivers. Modern CPU and memory architectures provide many interesting features to implement such techniques efficiently, however their advantages are often overestimated. The complexity of the memory architecture as well as necessary data processing in networking protocols may impose many problems and sometimes nullify the advantages of a promising ZeroCopy technique. We will try to take a closer look at various existing and proposed implementation and analyze their weak points. This paper will mostly concentrate on the modern UNIX-like operating systems such as Solaris and Linux with an emphasis on ZeroCopy performance and implementation issues in networking stacks.