Refine
Year of publication
- 2011 (189) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (71)
- INB - Institut für Nano- und Biotechnologien (35)
- Fachbereich Elektrotechnik und Informationstechnik (31)
- IfB - Institut für Bioengineering (29)
- Fachbereich Chemie und Biotechnologie (22)
- Fachbereich Luft- und Raumfahrttechnik (16)
- Fachbereich Energietechnik (15)
- Fachbereich Maschinenbau und Mechatronik (12)
- Solar-Institut Jülich (11)
- Fachbereich Bauingenieurwesen (5)
Language
- English (189) (remove)
Document Type
- Article (130)
- Conference Proceeding (44)
- Part of a Book (8)
- Conference: Meeting Abstract (3)
- Book (2)
- Doctoral Thesis (2)
Keywords
- Pflanzenphysiologie (2)
- Pflanzenscanner (2)
- plant scanner (2)
- Aktionskunst (1)
- Anastomose (1)
- Anastomosis (1)
- Biomechanics (1)
- Biomechanik (1)
- Bioreaktor (1)
- Blutzellenlagerung (1)
We investigate interaction networks that we derive from multivariate time series with methods frequently employed in diverse scientific fields such as biology, quantitative finance, physics, earth and climate sciences, and the neurosciences. Mimicking experimental situations, we generate time series with finite length and varying frequency content but from independent stochastic processes. Using the correlation coefficient and the maximum cross-correlation, we estimate interdependencies between these time series. With clustering coefficient and average shortest path length, we observe unweighted interaction networks, derived via thresholding the values of interdependence, to possess non-trivial topologies as compared to Erdös-Rényi networks, which would indicate small-world characteristics. These topologies reflect the mostly unavoidable finiteness of the data, which limits the reliability of typically used estimators of signal interdependence. We propose random networks that are tailored to the way interaction networks are derived from empirical data. Through an exemplary investigation of multichannel electroencephalographic recordings of epileptic seizures – known for their complex spatial and temporal dynamics – we show that such random networks help to distinguish network properties of interdependence structures related to seizure dynamics from those spuriously induced by the applied methods of analysis.
Bio-feedstocks
(2011)
Lignocellulosic biorefinery: Process integration of hydrolysis and fermentation (SSF process)
(2011)
The aim of the present work is the process integration and the optimization of the enzymatic hydrolysis of wood and the following fermentation of the products to ethanol. The substrate is a fiber fraction obtained by organosolv pre-treatment of beech wood. For the ethanol production, a co-fermentation by two different yeasts (Saccharomyces cerevisiae and Pachysolen tannophilus) was carried out to convert glucose as well as xylose. Two approaches has been followed: 1. A two step process, in which the hydrolysis of the fiber fraction and the fermentation to product are separated from each other. 2. A process, in which the hydrolysis and the fermentation are carried out in one single process step as simultaneous saccharification and fermentation (SSF). Following the first approach, a yield of about 0.15 g ethanol per gram substrate can be reached. Based on the SSF, one process step can be saved, and additionally, the gained yield can be raised up to 0.3 g ethanol per gram substrate.