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Automatic Programming of Cellular Automata and Artificial Neural Networks Guided by Philosophy
(2019)arXivMany computer models such as cellular automata have been developed and successfully applied. However, in some cases these models might be restrictive on the possible solutions or their solution is difficult to interpret. To overcome this problem, we outline an approach, the so-called allagmatic method, that automatically creates and programs models with as little limitations as possible but still maintaining human interpretability. We ...Working Paper -
Integrated management of Swiss cropland is not sufficient to preserve its soil carbon pool in the long-term
(2018)Biogeosciences DiscussionsCroplands are involved in the exchange of carbon dioxide (CO2) between the atmosphere and the biosphere. Furthermore, soil carbon (C) stocks play an important role in soil fertility. It is thus of great interest to know whether intensively managed croplands act as a net source or sink of atmospheric CO2 and if soil C stocks are preserved over long timescales. The FluxNet site CH-Oe2 in Oensingen, Switzerland, has been operational since ...Working Paper -
Investigating Climate Change and Reproduction: Experimental Tools from Evolutionary Biology
(2012)Working Paper -
Different processes shape prokaryotic and picoeukaryotic assemblages in the sunlit ocean microbiome
(2018)bioRxivThe smallest members of the sunlit-ocean microbiome (prokaryotes and picoeukaryotes) participate in a plethora of ecosystem functions with planetary-scale effects. Understanding the processes determining the spatial turnover of this assemblage can help us better comprehend the links between microbiome species composition and ecosystem function. Ecological theory predicts that selection, dispersal and drift are main drivers of species ...Working Paper -
Gland Segmentation in Colon Histology Images: The GlaS Challenge Contest
(2016)arXivColorectal adenocarcinoma originating in intestinal glandular structures is the most common form of colon cancer. In clinical practice, the morphology of intestinal glands, including architectural appearance and glandular formation, is used by pathologists to inform prognosis and plan the treatment of individual patients. However, achieving good inter-observer as well as intra-observer reproducibility of cancer grading is still a major ...Working Paper -
Factors controlling coccolithophore biogeography in the Southern Ocean
(2018)Biogeosciences DiscussionsThe biogeography of Southern Ocean phytoplankton controls not only the local biogeochemistry, but also the export of macronutrients to lower latitudes and depth. Of particular relevance is the interaction between coccolithophores and diatoms, with the former being prevalent along the "Great Calcite Belt" (40–60°S), while diatoms tend to dominate the regions south of 60°S. To address the factors controlling coccolithophore distribution and ...Working Paper -
The full greenhouse gases budget of Africa: Synthesis, uncertainties and vulnerabilities
(2013)Biogeosciences DiscussionsThis paper, developed under the framework of the RECCAP initiative, aims at providingimproved estimates of the carbon and GHG (CO2, CH4and N2O) balance of continentalAfrica. The various components and processes of the African carbon and GHG bud-get were considered, and new and available data derived by different methodologies (based on inventories, ecosystem fluxes, models, and atmospheric inversions) wereintegrated. The related uncertainties ...Working Paper -
Free Surface Water Flows – Modeling, Simulation and Control
(2017)Upstream and downstream channels are the key subsystems for the design of level/ flow control loops in run-of-river hydropower plants. Their dynamic response is notoriously complex, exhibiting low frequency resonance with weak damping, travelling waves, both sub- and supercritical flow, hydraulic jumps, etc. Part one of this report provides mathematical models derived from the basic physical conservation laws of mass and momentum (Reynolds ...Report -
Short-term variations of three rock glaciers and their relationship with meteorological conditions
(2015)Earth Surface Dynamics DiscussionsIn recent years, strong variations in the speed of rock glaciers have been detected,raising questions about their stability in a changed climate. In this study, we present continuous time series over three years of surface velocities of six GPS stations located on three rock glaciers in Switzerland. Intra-annual velocity variations are analyzed in relation to local meteorological factors, such as precipitation, snow(melt), as well as air ...Working Paper -
Time varying parameter models for catchments with land use change: the importance of model structure
(2017)Hydrology and Earth System Sciences DiscussionsRapid population and economic growth in South-East-Asia has been accompanied by extensive land use change with consequent impacts on catchment hydrology. Modelling methodologies capable of handling changing land use conditions are therefore becoming ever more important, and are receiving increasing attention from hydrologists. A recently developed Data Assimilation based framework that allows model parameters to vary through time in ...Working Paper