The Physics of Liquid Para-Hydrogen

Macroscopic systems of hydrogen molecules exhibit a rich thermodynamic phase behavior. Due to the simplicity of the molecular constituents a detailed exploration of the thermal properties of these boson systems at low temperatures is of fundamental interest. Here,we report theoretical and experimental results on various spatial correlation functions and corresponding distributions in momentum space of liquid para-hydrogen close to the triple point. They characterize the structure of the correlated liquid and provide information on quantum effects present in this Bose fluid. Numerical calculations employ Correlated Density-Matrix(CDM)theory and Path-Integral Monte-Carlo(PIMC)simulations. A comparison of these theoretical results demonstrates the accuracy of CDM theory. This algorithm therefore permits a fast and efficient quantitative analysis of the normal phase of liquid para-hydrogen.We compare and discuss the theoretical results with available experimental data.Comment: 14 pages, 7 figure

Femtosecond laser preparation of resin embedded samples for correlative microscopy workflows in life sciences

Correlative multimodal imaging is a useful approach to investigate complex structural relations in life sciences across multiple scales. For these experiments, sample preparation workflows that are compatible with multiple imaging techniques must be established. In one such implementation, a fluorescently labeled region of interest in a biological soft tissue sample can be imaged with light microscopy before staining the specimen with heavy metals, enabling follow-up higher resolution structural imaging at the targeted location, bringing context where it is required. Alternatively, or in addition to fluorescence imaging, other microscopy methods, such as synchrotron x-ray computed tomography with propagation-based phase contrast or serial blockface scanning electron microscopy, might also be applied. When combining imaging techniques across scales, it is common that a volumetric region of interest (ROI) needs to be carved from the total sample volume before high resolution imaging with a subsequent technique can be performed. In these situations, the overall success of the correlative workflow depends on the precise targeting of the ROI and the trimming of the sample down to a suitable dimension and geometry for downstream imaging. Here, we showcase the utility of a femtosecond laser (fs laser) device to prepare microscopic samples (1) of an optimized geometry for synchrotron x-ray tomography as well as (2) for volume electron microscopy applications and compatible with correlative multimodal imaging workflows that link both imaging modalities

Erste Befunde aus dem Projekt "MATH+ as a Research Object": Karriereziele, -wissen und -handeln, Nachwuchsförderung und Rekrutierung

Dies sind erste Ergebnisse aus dem Projekt "MATH+ as a research object", das Teil des Clusters MATH+ der Exzellenzstrategie von Bund und Ländern zur Stärkung universitärer Spitzenforschung ist.1 In dem Projekt werden die Reproduktionsmechanismen von Geschlechterasymmetrien in der Mathematik sowie das ungleichheitsreduzierende Potenzial karriere- und gleichstellungsunterstützender Maßnahmen untersucht. Das Projekt selbst ist als Teil der Gleichstellungs- und Diversity-Maßnahmen des Clusters konzipiert. Von daher hat es neben einer wissenschaftlichen Perspektive zugleich eine anwendungsorientierte Komponente, nämlich dem Cluster Informationen zu liefern, um empirisch fundiert die Weiterentwicklung dieser Maßnahmen sowie die Verringerung von Geschlechterungleichheiten voranzubringen. Vor diesem Hintergrund haben wir den detaillierten Analysen eine ausführlichere Zusammenfassung vorangestellt, die einen verständlichen und fokussierten Zugang auch für nicht-sozialwissenschaftliche Leser:innnen bieten soll