Moderiert die soziale Kompetenz adoleszenter Schüler den Zusammenhang zwischen ihren schulischen Peer-Beziehungen und ihrer Motivation?

"In der vorliegenden Studie galt es, soziale Kompetenz als Moderator in der Beziehung von soziomotivationalen Schüler-Beziehungen und Motivation in einer großen Stichprobe von Schüler/-innen der 7. und 8. Klassen (N=1088; MAge=13.7) an Brandenburger Gymnasien und Oberschulen zu testen. Mittels latenter moderierter Strukturgleichungsanalyse (LMS) wurden mögliche Interaktionseffekte von sozialer Kompetenz und sozio-motivationalen Schüler-Beziehungen in Bezug auf die Motivation der Schüler/-innen getestet. Die Ergebnisse zeigen, dass soziale Kompetenz die Beziehung zwischen der wahrgenommenen Schüler-Schüler-Beziehung und extrinsischer Motivation sowie Ausdauer und Fleiß moderiert. Zusätzlich fungiert soziale Kompetenz als Moderator zwischen Peers als positiven Motivatoren und intrinsischer Motivation sowie Ausdauer und Fleiß. Zusammenfassend lässt sich festhalten, dass positiv wahrgenommene Peer-Beziehungen basierend auf sozialer Kompetenz einen effektiven Ansatzpunkt zur Prävention und Intervention hinsichtlich der sinkenden schulischen Motivation in der Adoleszenz darstellen." (Autorenreferat)"This study examines whether social competence moderates the association between students' sociomotivational peer relationships and their academic motivation. The research is based on a large sample, consisting of 7th and 8th grade students (N=1088; MAge=13.7) attending secondary schools in Brandenburg, Germany. Latent moderated structural equations (LMS) were used to estimate possible interaction effects of social competence and socio-motivational peer relationships on students' academic motivation. The results demonstrated that social competence moderates the association between students' perception of the student-student relationship and extrinsic motivation, as well as perseverance and effort. In addition, social competence functions as a moderator in the association between students' perception of peers as positive motivators and intrinsic motivation, as well as perseverance and effort. To summarize, positive peer relationships within the school environment that are based on social competence are able to prevent and intervene in adolescents' general tendency towards a decline in motivation." (author's abstract

Comparison of open versus endovascular surgical treatment of abdominal aortic aneurysm

Abdominal aortic aneurysm (AAA) is a common condition of increasing prevalence, particularly among older men. An AAA is defined as a permanent dilation of the abdominal aorta, with a diameter greater than 30 mm or a diameter greater than 50% of the aortic diameter at the level of the diaphragm. As the size of the aneurysm increases, so does the risk of rupture. Therefore, prophylactic repair with insertion of a prosthetic graft is offered. Since 1951 traditional open aneurysm repair (OAR) was reported and minimally invasive endovascular repair (EVAR) was first reported in 1986. Data from four randomized controlled trials (EVAR-1, DREAM, OVER, ACE) for abdominal aortic aneurysm, which enrolled almost 3000 patients, in a period from 1999 to 2008, were summarized. In addition, registry databases on the treatment of AAA of average 4000 patients per year, based from 2015 to 2018 of the German Institute for Vascular Medicine Healthcare Research of the German Society for Vascular Surgery and Vascular Medicine, were compared. The EVAR procedure for AAA showed a lower risk of perioperative mortality but was associated with a higher cardiovascular and aneurysm-related complication rate. In particular, patients aged 80 years or older benefited from EVAR since the 30-day mortality of patients receiving OAR was higher. In mid-term and long-term follow-up there were no differences in survival after endovascular and open aortic repair. Overall, it depends on the respective underlying disease and anatomy which of the two approaches is to be preferred. In conclusion, both treatment options can be considered as equal and can be offered to patients

Vascular response towards biodegradable sirolimus-eluting polymeric scaffolds in the porcine model

In this study, PLLA-based sirolimus-eluting polymer scaffolds and permanent bare-metal stents (316L) were implanted interventionally into both common carotid arteries (CCA) of 6 female pigs via the left common iliac artery (8F-sheath). The pigs were administered dual antiplatelet drugs peroral starting 3 days before the procedure until the end of the study. Stented CCA segments were explanted after 12 weeks, and processed for quantitative histomorphometry, and estimation of vascular inflammation and injury scores. SIR/polymer scaffolds showed a decreased residual lumen area and higher restenosis after 12 weeks (4.45 ± 2.23 mm² and 61.68 ± 22.39%) as compared to the 316L reference stent (16.53 ± 1.23 mm² and 6.65 ± 1.30%). After 12 weeks, inflammation score and vascular injury score were higher in the SIR/polymer group (1.90 ± 1.15 and 1.26 ± 0.87) compared to the 316L group (0.57 ± 0.37 and 0.83 ± 0.34)

Hydrogen generation by electrolysis and storage in salt caverns: Potentials, economics and Systems aspects with regard to the German energy transition

The Plan-DelyKaD project focused on an in-depth comparison of relevant electrolysis technologies, identified criteria for and selected most relevant salt cavern sites in Germany, studied business case potentials for applying hydrogen taken from storage to different end-users and engaged in identifying the future role of hydrogen from large scale storage in the German energy system. The focus of this paper is on the latter three topics above. The bottom-up investigation of most suitable salt cavern sites was used as input for a model-based analysis of microeconomic and macroeconomic aspects. The results identify dimensions and locations of possible hydrogen Storages mostly in Northern Germany with ample potential to support the integration of fluctuating renewable electricity into the German power system. The microeconomic analysis demonstrates that the most promising early business case for hydrogen energy from large scale storage is its application as a fuel for the mobility sector. From a System perspective the analysis reveals that an optimized implementation of hydrogen generation via electrolysis and storage in salt caverns will have a positive impact on the power system in terms of reduced curtailments of wind power plants and lower residual peak loads

Power-to-Hydrogen:Technical and Economic Assessment

Hydrogen generation by electrolysis is expected to play an important role as a crosslinking technology between power generation on one hand and transport and industry on the other hand. When produced by water electrolysis from renewable energies - such as solar or wind - hydrogen can directly replace fossil fuels in transport and industry, thereby helping in the integration of renewable energies in other energy sectors. The relevant technologies are either the mature alkaline water electrolysis or the newer proton exchange membrane (PEM) water electrolysis, which exhibits higher potentials for performance enhancement and cost reduction. In this presentation, the results of the study Plan-DelyKaD are presented, which is a collaborative and comprehensive effort of several institutes in Germany to evaluate the impact of power-to-hydrogen on the energy system and also discusses the possible business cases and their profitability for different uses. The study comprises a detailed analysis of the electrolysis technology with specific plant designs, the analysis of geological salt formations and the determination of specific locations for hydrogen storage in salt caverns in Germany, the investigation of business cases for different uses of hydrogen, and the impact on the whole energy system regarding the integration of renewable energies into the power sector. Due to the limited time of the presentation only the electrolysis plant design, techno-economical aspects and some important results from the energy system analysis will be discussed