Arbeitsplatz Ganztagsschule : Chancen für Lehrkräfte und Schulleitungen

Auch als Veröff. im Internet: https://fis.uni-bamberg.de/bitstream/uniba/257/1/Dokument_1.pd

N-Minieralisierung organischer Handelsdünger und ihr Effekt auf den Ertrag von Kopfsalat und Blumenkohl im Frühjahr

Die ersten Gemüsejungpflanzen werden im Schweizerischen Mittelland Ende Februar ins Freiland gesetzt. In den kalten Böden wird zu dieser Zeit nur wenig Stickstoff mineralisiert. Deshalb werden die Gemüsekulturen in der Regel mit organischen Handelsdüngern versorgt, die relativ leicht mineralisierbaren Stickstoff enthalten. Zurzeit sind in der Schweiz 22 stickstoffreiche Handelsdünger für den biologischen Landbau zugelassen (Wyss et al. 1998), die sich in ihrer Zusammensetzung und Aufbereitungsform (gemahlen, pelletiert) unterscheiden. In drei Feldversuchen prüften wir verschiedene organische Handelsdünger auf ihre N-Mineralisierungsgeschwindigkeit und den Ertrag von Kopfsalat und Blumenkohl. Des weiteren werden die Ergebnisse aus einem Laborbrutversuch diskutiert

Breeding apples with durable disease resistance

Apple cultivars with high fruit quality, good productivity and durable disease and pest resistance are highly required in ecological Fruit growing. In the past apple breeders mainly used single resistance genes giving good field resistance towards scab and mildew. They originate from wild species such as Malus floribunda 821, M. zumi and M. robusta. However, this type of resistance can be overcome by new pathogen races. Today the main emphasis is on the combination of functional different major resistance genes and the use of quantitative resistance to achieve durability. Molecular markers were developed which particularly permit the detection of major resistance genes. The combined presence of the target resistance genes in a seedling can be determined by marker-assisted selection (MAS). Currently similar markers for loci on the genome which determine quantitative resistance (QTL) are being developed. Benefits and limits of durable disease resistant variety in organic Fruit growing will be discussed

Determination of Lamb Wave Modes on Lithium-Ion Batteries Using Piezoelectric Transducers

This work presents a method to determine the type of Lamb mode (antisymmetric or symmetric) that propagates through a lithium-ion pouch cell. To determine the type of mode and the group velocity at a specific frequency, two- and three-transducer setups were created. For these setups, it is important that all transducers have the same polarization direction. Two transducers are affixed to the center of the cell at a distance of several centimeters from each other so that the group velocity can be determined. Using cross-correlation, the group velocity of the emerging mode can be calculated. The measurement setup and the processing method was first validated with experiments on acrylic glass and aluminum plates. The measurements were supported with FEM simulations and a numerically calculated model. The output voltages of the receiving piezo-elements obtained in the FEM simulation are in agreement with the underlying theories. The phase shift, which results from the output voltage of the piezo-elements mounted one above the other on different sides of the plate, shows the type of mode. The results of the experimental determination of the Lamb mode that propagates through a lithium-ion pouch cell were validated with a numerically calculated multi-layer model and therefore validate this novel experimental approach

Development and testing of the 3U+ CubeSat PCDU for SOURCE

SOURCE (Stuttgart Operated University CubeSat for Evaluation and Education) is a 3U+ re-search CubeSat that is being developed by students at the University of Stuttgart in coopera-tion with the Institute for Space Systems and the Small Satellite Student Society KSat e.V.. The objectives include technology demonstrations, atmospheric research and the investigation of satellite demise while also serving as an educational program. SOURCE was selected by ESA's "Fly your Satellite" program and is currently in Phase D. The electrical power supply system combines commercial off-the-shelf parts with self-devel-oped units to meet the requirements of the payloads. The solar array configuration and Power Conditioning and Distribution Unit (PCDU) are self-developed, while the battery is a commer-cial product. A total of 56 solar cells provides up to 32W under ideal conditions, which can be stored in a 75Wh space-qualified lithium-ion battery. To maximise the power output of the solar cells, maximum power point tracking is performed by the PCDU. This is controlled by a radiation hardened microcontroller. The PCDU provides regulated 3.3V, 5V and unregulated battery voltage to the subsystems with 32 switchable outputs, 27 of which are latch-up current protected. The microcontroller controls these individual output channels and the switching between the various CubeSat modes as commanded by the on-board computer. Additionally, every output channel power consumption is monitored for overcurrents. The PCDU functions as a watchdog by checking the health of the on-board computer, rebooting it in case of a failure. High priority commands can be sent directly to the PCDU from the ground via the communication system, bypassing the on-board computer. These can reset either the communication subsystem, the on-board computer or the entire satellite. Four hybrid inhibits, using a combination of mechanical switches and FETs are integrated in the PCDU, replacing the usual fully mechanical design. Three are used to deactivate the satellite in the deployer configuration and the fourth is a remove-before-flight inhibit. An engineering model was manufactured during phase C and is being tested functionally, en-vironmentally and for performance. This paper presents the detailed design of the PCDU, the acquired test results and outlines issues encountered during the test

Mediterranean Rivers in Global Perspective

Rivers in the Mediterranean have always been hotspots of social formation. From antiquity to the present, rivers were important sources of fresh water, transport routes and energy suppliers as well as spaces of interaction between sea, coast and hinterland. This volume takes up recent debates on the spatial turn and global history, which have fundamentally changed notions of the Mediterranean as a natural given and of larger areas as well-defined entities. After an introduction to the relevant research contexts, it offers a collection of articles on the conceptualization of river histories, the Mediterranean and its rivers, and river studies from around the globe

Comparison of the Low-Cost Sun Sensors of the SOURCE and EIVE CubeSats

Sun sensors are commonly used attitude determination equipment which measure a spacecraft’s attitude relative to the sun. Multiple types of low-cost sun sensors were developed for the SOURCE and EIVE CubeSats. The SOURCE sun sensors consist of single photodiodes which are placed in a one-sensor-per-face as well as a pyramid arrangement. EIVE employs digital vector sun sensors based on quad-pin photodiodes. The SOURCE sun sensors in the one-sensor-per-face arrangement archive an accuracy of \u3c10° while the pyramid arrangement accomplishes an accuracy of \u3c7.5° without and \u3c5° with calibration. EIVE’s vector sun sensors offer an raw accuracy of 3°±5°. Multiple calibration approaches are presented with the best results leading to an accuracy of 0.7±3°. A direct comparison between the SOURCE and EIVE sensor types and configurations can be drawn since the same test bench was used to measure all sensors. The objective of this paper is to present and compare the different sun sensor concepts and their results