Biologische und biomechanische Grundlagen der arthroskopischen Rotatorenmanschettenrekonstruktion

Zusammenfassung: Eine erfolgreiche arthroskopische Rotatorenmanschettenrekonstruktion im Langzeitverlauf ist nicht nur von der rein technischen Wiederherstellung der Kontinuität des Muskel-Sehnen-Knochen-Komplexes, sondern auch von vielen weiteren Faktoren abhängig. Neben einer korrekten und schonenden Operationstechnik spielen u.a. biologische Faktoren wie die Muskel- und Sehnenqualität der Rotatorenmanschette sowie die Knochenqualität der Reinsertionszone für das Outcome eine wesentliche Rolle. In diesem Zusammenhang sind insbesondere die fettige Infiltration, Atrophie und Retraktion der rupturierten Rotatorenmanschette, die Sehnendegeneration sowie Osteopenie der Reinsertionszone an den Tuberkula zu berücksichtigen. Des Weiteren müssen grundlegende biomechanische Prinzipien bei der Nahttechnik und Fadenankerplatzierung beachtet werden, um ein technisch bedingtes Versagen der Refixation zu vermeide

Effects of Several Bioinspired Methods on the Stability of Coevolutionary Complexification

We study conditions for sustained growth of complexity in an abstract model of parasitic coevolution. Previous research has found that complexification is hard to achieve if the evolution of the symbiont population is constrained by the hosts but the evolution of the hosts is unconstrained, or, more generally, if the task difficulty is much higher for the symbionts than for the hosts. Here we study whether three bio inspired methods known from previous research on achieving stability in coevolution (balancing, niching, and reduced resistance) can restore complexification in such situations. We find that reduced resistance, and to a lesser degree niching, are successful if applied together with truncation selection, but not if applied together with fitness proportional selection

Surface charging of thick porous water ice layers relevant for ion sputtering experiments

We use a laboratory facility to study the sputtering properties of centimeter-thick porous water ice subjected to the bombardment of ions and electrons to better understand the formation of exospheres of the icy moons of Jupiter. Our ice samples are as similar as possible to the expected moon surfaces but surface charging of the samples during ion irradiation may distort the experimental results. We therefore monitor the time scales for charging and dis- charging of the samples when subjected to a beam of ions. These experiments allow us to derive an electric conductivity of deep porous ice layers. The results imply that electron irradiation and sputtering play a non-negligible role for certain plasma conditions at the icy moons of Jupiter. The observed ion sputtering yields from our ice samples are similar to previous experiments where compact ice films were sputtered off a micro-balance.Comment: arXiv admin note: text overlap with arXiv:1509.0400

Representation Class and Geometrical Invariants of Quantum States under Local Unitary Transformations

We investigate the equivalence of bipartite quantum mixed states under local unitary transformations by introducing representation classes from a geometrical approach. It is shown that two bipartite mixed states are equivalent under local unitary transformations if and only if they have the same representation class. Detailed examples are given on calculating representation classes.Comment: 11 page

Controlling front-end electronics boards using commercial solutions

LHCb is a dedicated B-physics experiment under construction at CERN's large hadron collider (LHC) accelerator. This paper will describe the novel approach LHCb is taking toward controlling and monitoring of electronics boards. Instead of using the bus in a crate to exercise control over the boards, we use credit-card sized personal computers (CCPCs) connected via Ethernet to cheap control PCs. The CCPCs will provide a simple parallel, I2C, and JTAG buses toward the electronics board. Each board will be equipped with a CCPC and, hence, will be completely independently controlled. The advantages of this scheme versus the traditional bus-based scheme will be described. Also, the integration of the controls of the electronics boards into a commercial supervisory control and data acquisition (SCADA) system will be shown. (5 refs)