Refine
Has Fulltext
- no (1537) (remove)
Year of publication
- 2012 (1537) (remove)
Document Type
- Article (1120)
- Doctoral Thesis (187)
- Monograph/Edited Volume (83)
- Conference Proceeding (52)
- Review (51)
- Preprint (22)
- Other (14)
- Part of a Book (5)
- Habilitation Thesis (1)
- Part of Periodical (1)
Keywords
- Conformational analysis (6)
- climate change (6)
- Holocene (5)
- ISM: supernova remnants (5)
- Microsatellites (5)
- gamma rays: galaxies (5)
- Embodied cognition (4)
- Eye movements (4)
- NMR spectroscopy (4)
- Photosynthesis (4)
Institute
- Institut für Biochemie und Biologie (238)
- Institut für Physik und Astronomie (198)
- Institut für Chemie (177)
- Institut für Geowissenschaften (160)
- Institut für Romanistik (83)
- Department Psychologie (82)
- Wirtschaftswissenschaften (73)
- Institut für Ernährungswissenschaft (59)
- Department Erziehungswissenschaft (47)
- Department Linguistik (38)
Spam has posed a serious problem for users of email since its infancy. Today, automated strategies are required to deal with the massive amount of spam traffic. IPv4 networks offer a variety of solutions to reduce spam, but IPv6 networks' large address space and use of temporary addresses - both of which are particularly vulnerable to spam attacks - makes dealing with spam and the use of automated approaches much more difficult. IPv6 thus poses a unique security issue for ISPs because it's more difficult for them to differentiate between good IP addresses and those that are known to originate spam messages.
Design thinking research
(2012)
Based on newly available data of both, the structural setting and thermal properties, we compare 3D thermal models for the area of Brandenburg, located in the Northeast German Basin, to assess the sensitivity of our model results. The structural complexity of the basin fill is given by the configuration of the Zechstein salt with salt diapirs and salt pillows. This special configuration is very relevant for the thermal calculations because salt has a distinctly higher thermal conductivity than other sediments. We calculate the temperature using a FEMethod to solve the steady state heat conduction equation in 3D. Based on this approach, we evaluate the sensitivity of the steady-state conductive thermal field with respect to different lithospheric configurations and to the assigned thermal properties. We compare three different thermal models: (a) a crustal-scale model including a homogeneous crust, (b) a new lithosphere-scale model including a differentiated crust and (c) a crustal-scale model with a stepwise variation of measured thermal properties. The comparison with measured temperatures from different structural locations of the basin shows a good fit to the temperature predictions for the first two models, whereas the third model is distinctly colder. This indicates that effective thermal conductivities may be different from values determined by measurements on rock samples. The results suggest that conduction is the main heat transport mechanism in the Brandenburg area.