Wurzeln und Wasser – Gesunde Pflanzen in der Schwammstadt: Bericht über die VIII. Urbane Pflanzen Konferenz „Wie funktioniert Stadtgrün besser?“, 25. September 2023, Universität Göttingen

Ein Weg, Städte an den Klimawandel anzupassen, ist die Umsetzung des Prinzips der „Schwammstadt“. Überflutungen durch Starkregen und Trockenheit durch Hitzeperioden soll durch phytotechnische und naturbasierte Maßnahmen entgegengewirkt werden. Die Stadt soll die Fähigkeit bekommen, große Mengen an plötzlich auftretendem Wasser aufzusaugen, dieses Wasser zu speichern und es dann durch Verdunstung und gezielte Bewässerung wieder abzugeben. Doch wie reagieren Pflanzen, wenn ihre Wurzeln überstaut werden? Wie lange darf ein solcher Zustand währen? Wie sollte die Kontaktzone zwischen Wurzelraum und gespeichertem Wasser gestaltet werden? Fördert man durch die Schwammstadt bodenbürtige Schaderreger der Wurzeln? Wie wirken sich Schadstofffrachten im Wasser auf die Pflanzengesundheit aus? Müssen wir besondere Pflanzen auswählen, die an den Wechsel von einem Zuviel zu einem Zuwenig an Wasser angepasst sind? Diesen Fragen ging die Tagung in Vorträgen und gemeinsamem Austausch nach

An in-flight plasma diagnostic package for spacecraft with electric propulsion

The plasma diagnostics presented in this article target the plasma surrounding a spacecraft that is created by the electric thruster and its surface modifying effects. The diagnostic package includes a retarding potential analyzer, a plane Langmuir probe, and an erosion sensor. The paper describes the instrument as well as suitable test environments for mimicking the effects expected in space and shows test results. The system is to fly for the first time on the Heinrich Hertz satellite, which is scheduled to be launched in 2023. The spacecraft will be equipped with a pair of Highly Efficient Multistage Plasma Thrusters (HEMPT) and a pair of Hall thrusters for redundancy

Sample return of interstellar matter (SARIM)

The scientific community has expressed strong interest to re-fly Stardust-like missions with improved instrumentation. We propose a new mission concept, SARIM, that collects interstellar and interplanetary dust particles and returns them to Earth. SARIM is optimised for the collection and discrimination of interstellar dust grains. Improved active dust collectors on-board allow us to perform in-situ determination of individual dust impacts and their impact location. This will provide important constraints for subsequent laboratory analysis. The SARIM spacecraft will be placed at the L2 libration point of the Sun–Earth system, outside the Earth’s debris belts and inside the solar-wind charging environment. SARIM is three-axes stabilised and collects interstellar grains between July and October when the relative encounter speeds with interstellar dust grains are lowest (4 to 20 km/s). During a 3-year dust collection period several hundred interstellar and several thousand interplanetary grains will be collected by a total sensitive area of 1 m2. At the end of the collection phase seven collector modules are stored and sealed in a MIRKA-type sample return capsule. SARIM will return the capsule containing the stardust to Earth to allow for an extraction and investigation of interstellar samples by latest laboratory technologies

From the garden to the table: so much grows in a small space! : Report on the VII. Urban Plant Conference, Julius Kühn Institute, Braunschweig, 28-29. October 2021

Die Selbstversorgung mit Gemüse, Obst und Kräutern erfreut sich zunehmender Beliebtheit. Haus– und Kleingärten, Balkone, Straßenzüge und Parks werden zum Experimentierraum für neue Wege der Pflanzenerzeugung und Pflanzenwahl. Ein wichtiger Aspekt bei der Entwicklung urbaner Landwirtschaft ist, die Menge, die in der Stadt von nicht-professionellen Gärtnern produziert wird, im Hinblick auf den Nahrungsbedarf der Stadt einzuschätzen zu lernen. In diesem Kontext wurde die VII. Urbane Pflanzen Conference (UPC) durchgeführt. Dieser Frage widmeten sich die Teilnehmer in Vorträgen, Workshops und Gartenbesichtigungen.The self-sufficiency with vegetables, fruits and herbs is enjoying increasing popularity. House and allotment gardens, balconies, streets and parks become space for experimentation for new ways of producing and choosing plants. An important aspect of the development of urban agriculture is to learn to estimate the amount that is produced in the city by non-professional gardeners in terms of the city’s food needs. The VII Urban Plants Conference (UPC) was held in this context. The participants addressed this question in lectures, workshops and garden tours

ISOPOLY-THIOANIONS AND HETEROPOLY-THIOANIONS - CRYSTAL AND MOLECULAR-STRUCTURES OF (PPH4)2[(WS4)WS(WS4)], CS2[(WS4)WO(WS4)H2O].2H2O AND (ASPH4)2[(WS4)NI(WS4)]

Müller A, Bögge H, Krickemeyer E, HENKEL G, KREBS B. ISOPOLY-THIOANIONS AND HETEROPOLY-THIOANIONS - CRYSTAL AND MOLECULAR-STRUCTURES OF (PPH4)2[(WS4)WS(WS4)], CS2[(WS4)WO(WS4)H2O].2H2O AND (ASPH4)2[(WS4)NI(WS4)]. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES. 1982;37(8):1014-1019

Development of a handheld sensor system for the online measurement of hydrogen peroxide in aseptic filling systems

A handheld sensor system for the online measurement of hydrogen peroxide (H2O2) in aseptic sterilisation processes has been developed. It is based on a calorimetric-type gas sensor that consists of a differential set-up of two temperature sensors, of which one is catalytically activated and the second one is passivated and used as reference. The sensor principle relies in detecting a rise in temperature on the active sensor due to the exothermic reaction of H2O2 on the catalytic surface. To characterise the sensor system towards H2O2 sensitivity and other influencing factors, measurements have been carried out both at an experimental set-up and a manufacturer's sterilisation machine. Physical sensor characterisation was done by means of the optical microscopy