Das Münzkabinett der Staatlichen Museen zu Berlin (Preußischer Kulturbesitz) in den Jahren 2021 und 2022

Jahresbericht 2021-2022 des Berliner MünzkabinettsAnnual report 2021-2022 of the Berlin Münzkabinet

Das Münzkabinett der Staatlichen Museen zu Berlin im Jahr 2023

Jahresbericht 2023 des Berliner Münzkabinetts2023 Report of the Berlin Münzkabinet

Priene, Türkei. Die Fundmünzen von Priene. Die Arbeiten in den Jahren 2015 bis 2017

The coin finds of Priene form one of the most important groups of numismatic material of western Asia Minor. The site of ancient Priene, which was never affected by medieval or modern settlement, provides a wealth of information on Hellenistic urbanism. At the end of the 19th century excavations unearthed over 6.100 coins which were later transferred to the Berlin Münzkabinett. Together with the coin finds from the Athenian agora those of Priene include the highest number of published pre-imperial objects. Since 1998 new archaeological field work provides additional insights and has currently added more than 1.500 new coin finds. In 2005 the Münzkabinett reinitiated its early 20th century research projects on the coin finds of Priene. The following survey contextualizes work and results of a two-year DAI post-doc scholarship (2015–2017). The most important feature of this recent period of research is the creation of an open access publication and data-base of the coin finds of Priene at ww2.smb.museum/mk_priene

Energie- und Ressourceneffizienz an der Hochschule Reutlingen: Verwaltung, Bibliothek, Rechenzentrum, Betriebswirtschaft, Chemie, Wirtschaftsingenieurwesen

In der heutigen Zeit ist es wichtig mit den Ressourcen sparsam umzugehen. Deshalb wird in dieser Projektarbeit im Fach Industrial Ecology die Ressourcen- und Energieeffizienz der Hochschule Reutlingen untersucht. Mit dem Aufzeigen der Potentiale in diesem Bereich können Kosten eingespart und die Umweltbelastung der Hochschule verringert werden. Im Rahmen dieser Projektarbeit wird eine Erstanalyse durchgeführt. Hierzu werden der Stromverbrauch, der Wärmeverbrauch, der Wasserverbrauch sowie erste Ansätze zur Einsparung der Ressourcen untersucht. Aus Gründen der begrenzten Zeit und der Komplexität des Themas wird nach dem Pareto-Prinzip (20/80 Regel) vorgegangen. Es soll ein Gesamtüberblick über die Ressourcennutzung geschaffen und Ansatzpunkte für spätere Projektarbeiten ermittelt werden. Die Bewertung der Wirtschaftlichkeit dieser Potentiale ist aus zeitlichen Gründen kein Bestandteil dieser Projektarbeit. Diese Arbeit soll als Ausgangspunkt für eine detaillierte Wirtschaftlichkeitsanalyse zukünftiger Projektarbeiten dienen

Generation of x-ray radiation in a storage ring by a superconductive cold-bore invacuum undulator

The first beam measurements with a cold-bore superconducting in-vacuum undulator in a storage ring are reported. Undulators are x-ray generators in light sources. The physical limitations of these devices limit the intensity and the brilliance of the x-ray beam. At present the undulators are made from permanent magnets. It was shown in earlier papers that at low electron beam intensities superconductive wires in the vacuum beam pipe can overcome the limitations inherent to permanent magnet undulators. It was argued that the use of these novel devices in light sources with high beam currents may be limited by the extreme anomalous skin effect regime in Cu at 4.2 K, which has so far undergone very little investigation, and the power deposited by the infrared part of the synchrotron radiation. The purpose of this paper is to present measurements of these effects at the synchrotron light source ANKA with stored currents up to 200 mA

Removing subordinate species in a biodiversity experiment to mimic observational field studies

Background: Positive effects of plant species richness on community biomass in biodiversity experiments are often stronger than those from observational field studies. This may be because experiments are initiated with randomly assembled species compositions whereas field communities have experienced filtering. Methods: We compared aboveground biomass production of randomly assembled communities of 2–16 species (controls) with experimentally filtered communities from which subordinate species were removed, resulting in removal communities of 1–8 species. Results: Removal communities had (1) 12.6% higher biomass than control communities from which they were derived, that is, with double species richness and (2) 32.0% higher biomass than control communities of equal richness. These differences were maintained along the richness gradient. The increased productivity of removal communities was paralleled by increased species evenness and complementarity. Conclusions: Result (1) indicates that subordinate species can reduce community biomass production, suggesting a possible explanation for why the most diverse field communities sometimes do not have the highest productivity. Result (2) suggests that if a community of S species has been derived by filtering from a pool of 2S randomly chosen species it is more productive than a community derived from a pool of S randomly chosen species without filtering

Relationships between ecosystem functions vary among years and plots and are driven by plant species richness

Ecosystem management aims at providing many ecosystem services simultaneously. Such ecosystem service multifunctionality can be limited by tradeoffs and increased by synergies among the underlying ecosystem functions (EF), which need to be understood to develop targeted management. Previous studies found differences in the correlation between EFs. We hypothesised that correlations between EFs are variable even under the controlled conditions of a field experiment and that seasonal and annual variation, plant species richness, and plot identity (identity effects of plots, such as the presence and proportion of functional groups) are drivers of these correlations. We used data on 31 EFs related to plants, consumers, and physical soil properties that were measured over 5 to 19 years, up to three times per year, in a temperate grassland experiment with 80 different plots, constituting six sown plant species richness levels (1, 2, 4, 8, 16, 60 species). We found that correlations between pairs of EFs were variable, and correlations between two particular EFs could range from weak to strong or negative to positive correlations among the repeated measurements. To determine the drivers of pairwise EF correlations, the covariance between EFs was partitioned into contributions from species richness, plot identity, and time (including years and seasons). We found that most of the covariance for synergies was explained by species richness (26.5%), whereas for tradeoffs, most covariance was explained by plot identity (29.5%). Additionally, some EF pairs were more affected by differences among years and seasons, showing a higher temporal variation. Therefore, correlations between two EFs from single measurements are insufficient to draw conclusions on tradeoffs and synergies. Consequently, pairs of EFs need to be measured repeatedly under different conditions to describe their relationships with more certainty and be able to derive recommendations for the management of grasslands