Fluid fibres in true 3D ferroelectric liquids

We demonstrate an exceptional ability of a high-polarisation 3D ferroelectric liquid to form freely-suspended fluid fibres at room temperature. Unlike fluid threads in modulated smectics and columnar phases, where translational order is a prerequisite for forming liquid fibres, recently discovered ferroelectric nematic forms fibres with solely orientational molecular order. Additional stabilisation mechanisms based on the polar nature of the mesophase are required for this. We propose a model for such a mechanism and show that these fibres demonstrate an exceptional non-linear optical response and exhibit electric field-driven instabilities

Beiträge zur Identifizierung der aktiven Zentren in Fe/ZSM-5-DeNOx-Katalysatoren

Die selektive katalytische Reduktion (SCR) von NO$_{x}$ stellt aufgrund ihrer Anwendbarkeit im O$_{2}$-reichen Milieu eine aussichtsreiche Variante zur Entstickung der Abgase von Diesel- und Magermixmotoren dar. Fe/ZSM-5-Katalysatoren haben sich hierfür als hochaktiv erwiesen. Darüber hinaus bietet dieses System auch eine aussichtsreiche Alternative zum etablierten V$_{2}$O$_{5}$/TiO$_{2}$-System, welches zur Entstickung industrieller Abgase mittels des SCR-Verfahrens zur Anwendung kommt. Die für die Aufklärung der Ursache der hohen Aktivität des Systems Fe/ZSM-5 essentielle Frage nach der Natur der aktiven Zentren wird jedoch kontrovers diskutiert. Aus diesem Grund wurden Fe/ZSM-5-Systeme auf verschiedene Weisen präpariert, um unterschiedliche Speziesverteilungen zu erzeugen. Die Aktivität dieser Systeme in der SCR mit NH$_{3}$ und i-C$_{4}$H$_{10}$ wurde daraufhin mit aus verschiedenen Charakterisierungsmethoden erhaltenen strukturellen Eigenschaften korreliert, um auf diese Weise Struktur-Wirkungs-Beziehungen abzuleiten

DeepGreen – Metadata Schema for the exchange of publications between publishers and open access repositories

In 2011, important priorities were set to realize green publications in the open access movement in Germany. With financial support from the German Research Foundation (DFG), libraries negotiated Alliance licenses with publishers that guarantee extensive open access rights. Authors of institutions, that have therewith access to licensed journals, can freely publish their articles immediately or after a short embargo period in a repository of their choice. However, authors hesitantly use these open access rights. Also libraries – as managers of institutional and subject based repositories and thus legitimated representatives for the authors – only rarely make use of these rights. The aim of DeepGreen is to make the majority of those publications available online. Together with publishers of the Alliance licenses, the project consortium wants to develop a nearly fully automated workflow that covers both the delivery of data, including the full texts, of the publishers, as well as the data transformation to the necessary import formats and the loading process into the repositories. An intermediate “publication router” will serve as a distribution platform. The DeepGreen metadata schema contains metadata properties describing a wide range of deliverable bibliographic metadata from the Alliance license publishers (most common standards are JATS and CrossRef XML) as well as its compliance with technical, quality and metadata standards of the repositories. The schema includes required metadata elements and optional properties providing additional information.The metadata schema is aligned to the OCLC repository best practices (“Best Practices for CONTENTdm and other OAI-PMH compliant repositories: creating sharable metadata”, URL: http://www.oclc.org/content/dam/support/wcdigitalcollectiongateway/MetadataBestPractices.pdf). The current version of the schema is subject to changes as the functional requirements and workflow practices are evolving during the project experiences and prototype production