Damage of bearings caused by electrical discharge currents at large drives derived from latest field research results

Bearing currents are not all the same. Under certain circumstances and special use cases classic bearing insulations are not sufficient anymore to prevent bearing currents due to the operation of frequency converters. Additional corrective measures have to be implemented to reduce the source of bearing currents the common mode current. The usage of nanocrystalline tape wound cores shows high effectiveness. As part of a big field study with more than 50 large drive trains in the primary industry, the damaging mechanics of bearing currents are examined under real conditions. Of exceptional high interest is the influence of disturbances which can hardly be simulated in the laboratory. Additional to the shielded motor cable parallel installed functional potential equalization cables applied multiple times have almost no effect in regard to reducing the bearing current. With an optimal installed functional potential equalization system more than 95 percent of the common mode current can flow back through the motor cable shield to the converter. The disturbance impact in the field can influence the voltage over the bearing that breakthroughs are favored but also reduced

Charakterisierung von Mückenbrutplätzen im Roßlauer Oberluch

Das Roßlauer Oberluch bietet mit seinen Feuchtflächen ideale Lebensräume für eine artenreiche Fauna und Flora. Auch Stechmücken finden hier gute Reproduktionsbedingungen. Auf Grund der prognostizierten Klimaerwärmung könnten sich diese Bedingungen sogar noch verbessern, denn starke Regenfälle, Überschwemmungen und hohe Temperaturen begünstigen die Fortpflanzung von Stechmücken. Neben den Faktoren, die die Entwicklung der Mücken fördern, wirken natürlich auch regulierende Mechanismen. Neben Fressfeinden spielen Nahrungskonkurrenten eine wichtige Rolle für den Bestand einer Art. Während die Fressfeinde bereits gut untersucht sind, ist über die Nahrungskonkurrenten der Mückenlarven bislang wenig bekannt. Mückenlarven filtrieren organische Partikel aus dem Wasser und beanspruchen demnach dieselben Nahrungsressourcen wie filtrierende Kleinkrebse, sodass Kleinkrebse ernstzunehmende Nahrungskonkurrenten für Mückenlarven sind. 2007 wurde im Rahmen komplexer Untersuchungen im Zusammenhang mit der Deichrückverlegung eine Studie zur Charakterisierung von Mückenbrutplätzen im Roßlauer Oberluch durchgeführt. Die Ergebnisse werden im Folgenden dargestellt

Methodische Auslegung und Erprobung von Fahrzeug-Crashstrukturen

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Seasonality in extra-pulmonary tuberculosis notifications in Germany 2004-2014- a time series analysis

Background Seasonality in tuberculosis (TB) has been found in different parts of the world, showing a peak in spring/summer and a trough in autumn/winter. The evidence is less clear which factors drive seasonality. It was our aim to identify and evaluate seasonality in the notifications of TB in Germany, additionally investigating the possible variance of seasonality by disease site, sex and age group. Methods We conducted an integer-valued time series analysis using national surveillance data. We analysed the reported monthly numbers of started treatments between 2004 and 2014 for all notified TB cases and stratified by disease site, sex and age group. Results We detected seasonality in the extra-pulmonary TB cases (N = 11,219), with peaks in late spring/summer and troughs in fall/winter. For all TB notifications together (N = 51,090) and for pulmonary TB only (N = 39,714) we did not find a distinct seasonality. Additional stratified analyses did not reveal any clear differences between age groups, the sexes, or between active and passive case finding. Conclusion We found seasonality in extra-pulmonary TB only, indicating that seasonality of disease onset might be specific to the disease site. This could point towards differences in disease progression between the different clinical disease manifestations. Sex appears not to be an important driver of seasonality, whereas the role of age remains unclear as this could not be sufficiently investigated.Peer Reviewe

Cross domain fusion for spatiotemporal applications: taking interdisciplinary, holistic research to the next level

Exploiting the power of collective use of complementing data sources for the discovery of new correlations and findings offers enormous additional value compared to the summed values of isolated analysis of the individual information sources. In this article, we will introduce the concept of “cross domain fusion” (CDF) as a machine learning and pattern mining driven and multi-disciplinary research approach for fusing data and knowledge from a variety of sources enabling the discovery of answers of the question to be examined from a more complete picture. The article will give a basic introduction in this emerging field and will highlight examples of basic CDF tasks in the field of marine science

Vorwort zum Sonderheft „Cross-Domain Fusion“

Daten für neue Erkenntnisse durch den Einsatz moderner Data Mining Techniken und Methoden des maschinellen Lernens zu nutzen, wird für immer mehr Disziplinen ein wichtiges – bereits für viele Anwendungen aus den Naturwissenschaften sogar bereits ein essentielles – Instrument der modernen Forschung