Comet Machholz (C/2004 Q2): morphological structures in the inner coma and rotation parameters     

Federico Manzini  Raoul Behrend  Lorenzo Comolli  Virginio Oldani  Cristiano B. Cosmovici  Roberto Crippa  Cesare Guaita  Gottfried Schwarz  Josep Coloma 《Astrophysics and Space Science》2012,337(2):531-542

Extensive observations of comet C/2004 Q2 (Machholz) were carried out between August 2004 and May 2005. The images obtained were used to investigate the comet’s inner coma features at resolutions between 350 and 1500 km/pixel.  相似文献   

Investigation of current and future potential distribution of <Emphasis Type="Italic">Astragalus gossypinus</Emphasis> in Central Iran using species distribution modelling     

Mostafa Tarkesh  Gottfried Jetschke 《Arabian Journal of Geosciences》2016,9(1):80

The potential impact of climate change on Astragalus gossypinus in Central Iran based on grid map 2.5 arc min was analyzed. A stratified sampling was applied through a geographic information system to pick up 587 sample sites (prevalence 0.39). For each sampling site, the presence or absence of given species together with environmental variables was recorded. Two novel statistical techniques, logistic regression tree (LRT) and nonparametric multiplicative regression (NPMR), were used to examine environmental variables related to the current species distribution. Using these models, maps of current potential distribution and potential distribution for a climatic change scenario (2CO₂) were generated. Both statistical techniques produced strong and useful models, but NPMR identified a much smaller subset of relevant predictor variables. The model demonstrated that the occurrence of A. gossypinus is highly probable when the precipitation of the wettest month is between 30 and 50 mm and the mean temperature of the wettest quarter is between ?2 and +4 °C, but much lower outside this range. Under double-CO₂ climatic scenario, predicting a moister and slightly warmer climate in Central Iran, A. gossypinus is expected to move north-eastwards with a decreasing area of distribution.  相似文献   

Earthquake early warning for transport lines     

Désirée Hilbring  Tanja Titzschkau  Alfons Buchmann  Gottfried Bonn  Friedemann Wenzel  Eberhard Hohnecker 《Natural Hazards》2014,70(3):1795-1825

This paper analyzes the potential of earthquake early-warning systems for transport lines. The interdisciplinary work focuses on rapidly producing an alert map during an ongoing earthquake as well as providing a damage map immediately after the strong-motion phase that visualizes potential damages to the railway infrastructure. In order to meet these application requirements, a service-oriented architecture based on geospatial standards is specified. This ensures the portability of the system architecture to different geographic regions as well as a potential transfer to other natural disasters and infrastructure systems. The first part of the paper describes the standard-based services of the system architecture together with design principles that are useful for the realization of early-warning systems. In the second part of the paper, an online demonstrator for the exemplary test area in the federal state of Baden-Württemberg, Germany, is presented. The system architecture of the demonstrator includes an earthquake early-warning methodology based on artificial neural networks and an infrastructure-specific damage assessment. The third part of the paper analyzes the potential of implementing low-cost sensors in the track, which would provide a dense network directly at the railway infrastructure.  相似文献   

Correction to: The probabilistic seismic hazard assessment of Germany—version 2016, considering the range of epistemic uncertainties and aleatory variability     

Gottfried Grünthal  Dietrich Stromeyer  Christian Bosse  Fabrice Cotton  Dino Bindi 《Bulletin of Earthquake Engineering》2018,16(10):4397-4398

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