Universitätspublikationen
11 search hits
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Measuring shear viscosity using correlations
(2007)
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Sean Gavin
Mohamed Abdel-Aziz
- Measurements of transverse momentum fluctuations can be used to determine the shear viscosity [1]. We use current data to estimate the viscosity-to-entropy ratio in the range from 0.08 to 0.3, and discuss how future measurements can reduce this uncertainty.
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Extraction of network topology from multi-electrode recordings: is there a small-world effect?
(2011)
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Felipe Gerhard
Gordon Pipa
Bruss Lima
Sergio Neuenschwander
Wulfram Gerstner
- The simultaneous recording of the activity of many neurons poses challenges for multivariate data analysis. Here, we propose a general scheme of reconstruction of the functional network from spike train recordings. Effective, causal interactions are estimated by fitting generalized linear models on the neural responses, incorporating effects of the neurons’ self-history, of input from other neurons in the recorded network and of modulation by an external stimulus. The coupling terms arising from synaptic input can be transformed by thresholding into a binary connectivity matrix which is directed. Each link between two neurons represents a causal influence from one neuron to the other, given the observation of all other neurons from the population. The resulting graph is analyzed with respect to small-world and scale-free properties using quantitative measures for directed networks. Such graph-theoretic analyses have been performed on many complex dynamic networks, including the connectivity structure between different brain areas. Only few studies have attempted to look at the structure of cortical neural networks on the level of individual neurons. Here, using multi-electrode recordings from the visual system of the awake monkey, we find that cortical networks lack scale-free behavior, but show a small, but significant small-world structure. Assuming a simple distance-dependent probabilistic wiring between neurons, we find that this connectivity structure can account for all of the networks’ observed small-world-ness. Moreover, for multi-electrode recordings the sampling of neurons is not uniform across the population. We show that the small-world-ness obtained by such a localized sub-sampling overestimates the strength of the true small-world structure of the network. This bias is likely to be present in all previous experiments based on multi-electrode recordings.
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"PULS." – a Blog-based Online-Magazine for Students of Medicine of the Goethe University Frankfurt
(2013)
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Bettina Wurche
Gertrud Klauer
Frank Nürnberger
- In the context of nationwide protests 2009 also students of the faculty of medicine/dentistry at Goethe-University in Frankfurt demanded more transparency and communication. To satisfy these demands, a web 2.0-tool offered an innovative solution: A blog-based online-magazine for students and other faculty-members.
The online-magazine „PULS.“ is realized with the share-ware blog-software (wordpress version 3.1.3) and is conceived and written by an online-journalist. „PULS.“ is available from https://newsmagazin.puls.med.uni-frankfurt.de/wp/.
The articles are generated from own investigations and from ideas of different groups of the faculty– deanship, students and lecturers. A user-analysis is conducted with the open-source software Piwik and considers the data security. Additionally, every year an anonymous online-user-survey (Survey Monkey) is conducted.
“PULS.” is continuously online since 14.02.2010 and has published 806 articles (state: 27.11.2012) and has about 2400 readers monthly. The content focuses on the needs of Frankfurt medical students. The close cooperation with different groups of the faculty - deanship, students and lecturers - furthermore guarantees themes relevant to the academic faculty. “PULS.” flanks complex projects and decisions with background-information and communicates them understandable.
The user-evaluation shows a growing number of readers and a high acceptance for the online-magazine, its themes and its style. The web 2.0-tool “Blog” and the web-specific language comply with media habits of the main target group, the students of the faculty medicine/dentistry.
Thus, “PULS.” has proven as a suitable and strategic instrument. It pushes towards a higher transparency, more communication and a stronger identification of the students with their faculty.
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75 Jahre Universität Frankfurt
(1989)
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Die Bestände der Judaica-Sammlung auf dem Weg ins Internet : zwei Digitalisierungsprojekte an der Stadt- und Universitätsbibliothek Frankfurt a. M.
(2000)
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Rachel Heuberger
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Institut für Kunstpädagogik
(2001)
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Christine Nowak
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Campus Westend
(2001)
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Christian [Red.] Preiser
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Lobende Reden, Bildungsideale und trommelnder Protest : offizielle Einweihung des Campus Westend
(2001)
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Claudia Baumgart
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Interessenvertreter und Problemlöser : ein Jahr Ombudsmann für Studierende
(2002)
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Christian Winter
Ann Wente
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Lagen des Rechts : eine Polemosophie zum Ausgang
(2006)
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Fabian Steinhauer
- Es gibt epistemologische Brüche vielleicht nicht so häufig, wie die Konjunktur all der Wenden bzw. Turns andeutet. Aber wenn es auch wenige sind: sie hinterlassen Sand am Meer. Wir hinterlassen vielleicht tiefe Eindrücke, aber dass sind eben nur Fußstapfen im Sand.
