Refine
Year of publication
Document Type
- Article (11)
- Working Paper (7)
- Conference Proceeding (4)
- Report (1)
Has Fulltext
- yes (23)
Is part of the Bibliography
- no (23)
Keywords
- Alternate husbandry (1)
- COVID (1)
- Egartenwirtschaft (1)
- Q-factor (1)
- Upper Austria (1)
- accident (1)
- electromagnetic field (1)
- grassland communities (1)
- injury (1)
- land use history (1)
The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those processes, because they are shielded from the s-process flow and r-process β-decay chains. These nuclei are attributed to the p and rp process.
For all those processes, current research in nuclear astrophysics addresses the need for more precise reaction data involving radioactive isotopes. Depending on the particular reaction, direct or inverse kinematics, forward or time-reversed direction are investigated to determine or at least to constrain the desired reaction cross sections.
The Facility for Antiproton and Ion Research (FAIR) will offer unique, unprecedented opportunities to investigate many of the important reactions. The high yield of radioactive isotopes, even far away from the valley of stability, allows the investigation of isotopes involved in processes as exotic as the r or rp processes.
Children’s and adolescents’ lives drastically changed during COVID lockdowns worldwide. To compare accident- and injury-related admissions to pediatric intensive care units (PICU) during the first German COVID lockdown with previous years, we conducted a retrospective multicenter study among 37 PICUs (21.5% of German PICU capacities). A total of 1444 admissions after accidents or injuries during the first lockdown period and matched periods of 2017–2019 were reported and standardized morbidity ratios (SMR) were calculated. Total PICU admissions due to accidents/injuries declined from an average of 366 to 346 (SMR 0.95 (CI 0.85–1.05)). Admissions with trauma increased from 196 to 212 (1.07 (0.93–1.23). Traffic accidents and school/kindergarten accidents decreased (0.77 (0.57–1.02 and 0.26 (0.05–0.75)), whereas household and leisure accidents increased (1.33 (1.06–1.66) and 1.34 (1.06–1.67)). Less neurosurgeries and more visceral surgeries were performed (0.69 (0.38–1.16) and 2.09 (1.19–3.39)). Non-accidental non-suicidal injuries declined (0.73 (0.42–1.17)). Suicide attempts increased in adolescent boys (1.38 (0.51–3.02)), but decreased in adolescent girls (0.56 (0.32–0.79)). In summary, changed trauma mechanisms entailed different surgeries compared to previous years. We found no evidence for an increase in child abuse cases requiring intensive care. The increase in suicide attempts among boys demands investigation.
Aus den Hochlagen des oberösterreichischen Mühlviertels werden Vegetationsbestände von aktuell ausgebildeten Formen der Feldgraswirtschaft beschrieben. Die Vegetation von Feldgrasäckern sowie die Vegetationsdynamik im Verlaufe der „Alterung“ grünlandförmiger Feldgrasflächen werden dargestellt und Rückschlüsse auf verschiedene Intensitätsstufen der Wechselwirtschaft, wie sie anhand der Vegetationsbestände „lesbar“ werden, getätigt. Auf dem Weg der tabellarischen Darstellung wird die Vegetationsdynamik als zeitliche Reihe nachvollziehbar.
Anhand von Vegetationskartierungen bei zwei für die Region typischen Beispielbetrieben - einem intensiv wirtschaftenden Großbetrieb und einem kleinen bäuerlichen Nebenerwerbshof - werden die unterschiedlichen Bedeutungen der Wechselwirtschaft für die Betriebe skizziert. Der Vergleich liefert darüber hinaus Indizien für den allgemeinen Verlauf der Beschleunigung und Intensivierung der Wechselwirtschaft, der im Mühlviertel in den vergangenen Jahrzehnten vollzogen worden ist. In der traditionellen Wechselwirtschaft standen je nach standörtlichen Gegebenheiten und den jeweiligen Nutzungsabsichten 2-3 jährigen Ackernutzungen längere Grünlandperioden gegenüber, die sich über 7-8 Jahre erstreckten, die aber auch über längere Zeiträume ausgedehnt werden konnten. Demgegenüber führt eine Intensivierung der Nutzung im Zuge der Modernisierung und Intensivierung der Wirtschaftsweise in der jüngeren Vergangenheit zur Verkürzung der Grünlandphase, bis hin zu einer 2-4 Jahre andauernden Gras- oder Kleegrasnutzung. Folge ist bei den Wechselländern eine Verschiebung von wiesenartigen Beständen hin zu solchen, die von Ansaatgräsern und Acker-Unkräutern bestimmt werden und dem Poo-Rumicetum zuzuordnen sind.
A new method of measuring quality factors in cavities is presented. This method is well suited to measure quality factors in undamped cavities as well as in heavily damped cavities, and in addition this method provides a possibility of separating modes and measuring quality factors especially in cases of overlapping modes. Measurements have been carried out on HOM-damped cavities for the DESY/THD linear collider project. Results are presented.
Determination of field strength and quality factor of heavily HOM damped accelerator cavities
(1992)
Two methods of of measuring field strength in accelerator cavities, heavily damped with respect to higher order modes (HOM), are presented. From the results of the field measurements the coupling (damping) factor and thus the quality factor of the damped resonator can be derived. Measurements of a pillbox resonator with heavily damped TM110-mode (Q < 20) demonstrate the usefulness of the techniques presented, even in this extreme range.
Damping cells for the higher order modes are necessary for the S-band linear collider to minimize BBU (Beam-Break-Up). The construction of the damper cells has to take into account the different field geometries of the higher order modes. So two different types of dampers have been designed: a wall slotted an an iris slotted cell. In order to optimize the two types of damping cells with respect to damping strength, impedance matching between coupling system and waveguide dampers and between damping cell and undamped cells and the tuning system, damping cells of both types have been built and examinated.