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The impact of ellipsoidal particle shape on pebble breakage in gravel
(2012)International Journal of Rock Mechanics and Mining SciencesWe have studied the influence of particle shape and consequently loading configuration on the breakage load of fluvial pebbles. Unfortunately, physical strength tests on pebbles, i.e., point-load tests, can only be conducted under one specific stable loading configuration. Therefore, the physical uniaxial strength tests performed in this study were extended by a two-dimensional finite-element stress analysis, which is capable of investigating ...Journal Article -
Associated vascular lesions in patients with spontaneous coronary artery dissection
(2012)Swiss Medical WeeklyAIM: To identify vascular abnormalities in patients presenting with spontaneous coronary artery dissection (SCAD). METHODS: We performed a whole-body MR angiography and a duplex sonography of the renal and carotid arteries in 12 patients (9 women, 3 men) with SCAD to identify vascular abnormalities. RESULTS: MR angiography revealed abnormalities of the renal arteries in 3/12 patients (25%). All 3 patients were women, 2 presented ...Journal Article -
Nitrogen use and the effects of nitrogen taxation under consideration of production and price risks
(2012)Agricultural SystemsProduction and price risks affect optimal nitrogen use as well as the effects of nitrogen taxation if farmers’ risk aversion is taken into account. We apply a bio-economic model to investigate the influence of risk aversion on nitrogen use in Swiss maize production. Income risks for farmers are expected to increase in the future, for instance, due to higher price variability caused by market liberalization or by higher yield variability ...Journal Article -
Modeling the sensitivity of agricultural water use to price variability and climate change - An application to Swiss maize production
(2012)Agricultural Water ManagementWe analyze the sensitivity of crop management under current and future climate scenarios to changes in economic boundary conditions. In particular, we focus on the effects of changing price risks. We combine a bio-economic modeling approach and a crop growth model CropSyst with an economic model that represents the decision making process of a risk-averse farmer. We apply the models to irrigated maize production in Switzerland. To analyze ...Journal Article