Etablierung des entomophagen Pilzes Metarhizium brunneum in Zwischenfrüchten zur Stärkung der Kartoffel entlang der Fruchtfolge.

Die Fähigkeit von Metarhizium brunneum (CB15) zur Besiedlung relevanter Pflanzen in der Kartoffelfruchtfolge wurde untersucht. Der Pilz war in der Lage, die Rhizosphäre aller untersuchten Pflanzen zu besiedeln und in einer Kartoffelsorte einen wachstumsfördernden Effekt zu induzieren

Mesoskopisches Simulationsmodell zur Kollektivfortschreibung

Vorgestellt wird ein am ZPR neu entwickeltes Simulationsmodell zur Fortschreibung von Bausparkollektiven, das Verträge mit ähnlichem Sparverhalten in Gruppen zusammenfaßt und auf Einzelkonten basiert. Zum einen wird erläutert, wie mit Hilfe von Clusteranalyse Prototypen bestimmt werden, die das Sparverhalten der Schichten angeben, zum anderen wird gezeigt, wie anschließend ein gegebener Bestand an Bausparverträgen mittels eines Minimum-Cost-Flow-Algorithmus den definierten Schichten zugeordnet wird. Das beschriebene Modell eignet sich sowohl für kurz- als auch für langfristige Simulationen

Model-based clustering with Hidden Markov Models and its application to financial times series data

We have developed a method to partition a set of data into clusters by use of Hidden Markov Models. Given a number of clusters, each of which is represented by one Hidden Markov Model, an iterative procedure finds the combination of cluster models and an assignment of data points to cluster models which maximizes the joint likelihood of the clustering. To reflect the non-Markovian nature of some aspects of the data we also extend classical Hidden Markov Models to employ a non-homogeneous Markov chain, where the non-homogeneity is dependent not on the time of the observation but rather on a quantity derived from previous observations. We present the method, a proof of convergence for the training procedure and an evaluation of the method on simulated time-series data as well as on large data sets of financial time-series from the Public Saving and Loan Banks in Germany

Microspheres as Surrogate Helminth Eggs: A Comparative Labscale Sedimentation Study for Tap- and Wastewater

Re-use of water containing helminth eggs during irrigation for agricultural purposes poses health risks, and likewise during research, due to the potential of spreading on contact. Therefore, polystyrene latex microspheres could be used as surrogates for chemical or biological species during colloidal transport. The aim here is to compare the settling velocities of microspheres having varied surface coatings—that is, proteins A, G and A/G; with that of real helminth eggs obtained from literature. The settling velocities of the microspheres were experimentally determined in tap- and wastewater, as well as theoretically in tap water; which was found to be within the range of mean values for those experimentally determined. There were no differences amongst the microspheres types used for settling in wastewater (i.e., A = 0.072 ± 0.02; G = 0.060 ± 0.03; A/G = 0.053 ± 0.01 mm/s). The same applied for settling in tap water (i.e., A = 0.068 ± 0.02; G = 0.047 ± 0.004; A/G = 0.095 ± 0.02 mm/s), except for microsphere G being different from microsphere A/G. All three types of microspheres settled at velocities lower than that of the wastewater particles (=0.118 ± 0.03). T-test analyses of settling velocities of microspheres in both tap- and wastewater, versus that from literature (i.e., Ascaris, Trichuris and Oesophagostomum), showed that microsphere A and A/G may surrogate for Ascaris in tap water, the same as A/G for Oesophagostomum. In wastewater however, both microspheres A and G are a good fit for Trichuris

Analyse großer Datenmengen und Clusteralgorithmen im Bausparwesen

Kollektivanalysen und darauf aufbauende Prognosen sind seit langem ein wichtiger Beitrag der Bausparmathematik zu Fragen der Liquiditätsplanung, der Produktpflege und der Produktentwicklung. Im Rahmen einer Kooperation zwischen den Landesbausparkassen und dem Zentrum für Paralleles Rechnen wurden daher Bausparmodelle entwickelt, die der Analyse des Verhaltens der Bausparer und der Vorhersage ihres zukünftigen Verhaltens dienen. Eine Weiterentwicklung dieser Modellansätze mit Hilfe der Clusteranalyse soll in diesem Beitrag vorgestellt werden

Microspheres as surrogate helminth eggs

Re-use of water containing helminth eggs during irrigation for agricultural purposes poses health risks, and likewise during research, due to the potential of spreading on contact. Therefore, polystyrene latex microspheres could be used as surrogates for chemical or biological species during colloidal transport. The aim here is to compare the settling velocities of microspheres having varied surface coatings - that is, proteins A, G and A/G; with that of real helminth eggs obtained from literature. The settling velocities of the microspheres were experimentally determined in tap- and wastewater, as well as theoretically in tap water; which was found to be within the range of mean values for those experimentally determined. There were no differences amongst the microspheres types used for settling in wastewater (i.e., A = 0.072 $\pm$ 0.02; G = 0.060 $\pm$ 0.03; A/G = 0.053 $\pm$ 0.01 mm/s). The same applied for settling in tap water (i.e., A = 0.068 $\pm$ 0.02; G = 0.047 $\pm$ 0.004; A/G = 0.095 $\pm$ 0.02 mm/s), except for microsphere G being different from microsphere A/G. All three types of microspheres settled at velocities lower than that of the wastewater particles (=0.118 $\pm$ 0.03). T-test analyses of settling velocities of microspheres in both tap- and wastewater, versus that from literature (i.e., $\it Ascaris$, $\it Trichuris$ and $\it Oesophagostomum$), showed that microsphere A and A/G may surrogate for $\it Ascaris$ in tap water, the same as A/G for $\it Oesophagostomum$. In wastewater however, both microspheres A and G are a good fit for $\it Trichuris$