Klímaadaptációs és kockázatértékelési kézikönyv a Duna makrorégióra

In this paper we find the maximal order of an automorphism of a trigonal Riemann surface of genus g, g5. We find that this order is smaller for generic than for cyclic trigonal Riemann surfaces, showing that generic trigonal surfaces have “less symmetry” than cyclic trigonal surfaces. Finally we prove that the maximal order is attained for infinitely many genera in both the cyclic and the generic case.Original Publication:Antonio F. Costa and Milagros Izquierdo, Maximal order of automorphisms of trigonal Riemann surfaces, 2010, Journal of Algebra, (323), 1, 27-31.http://dx.doi.org/10.1016/j.jalgebra.2009.09.041Copyright: Elsevier Science B.V., Amsterdamhttp://www.elsevier.com

Assessing drought and drought-related wildfire risk in Kanjiza, Serbia: the SEERISK methodology

Climate changes alter the frequency and magnitude of a range of physical processes that often have negative consequences on life and property. Decision makers, local authorities and other end users are in need of tools and methodologies for assessing the risk of natural hazards in order to be able to design strategies for reducing it. The SEERISK project is an EU project that aims at the harmonization of risk assessment methodologies in southeast Europe. For this reason, a common risk assessment methodology has been developed and was applied in six case study areas. One of them is Kanjiza municipality in Serbia. Major environmental concerns in Kanjiza municipality include the occurrence of drought and drought-related wildfires. Between 2001 and 2012, 12 drought periods were registered, and between 2007 and 2012, 210 wildfire incidents were recorded. The direct and indirect estimated damage of these events exceeded 200 million Euros. Apart from the monetary loss related to these incidents, there were one victim and one injured person related to a wildfire event in this period. This study demonstrates an application of the SEERISK methodology for drought and drought-related wildfire risk assessment. The results show that more than 80 % of the area under study belongs to the very high and high-risk categories. The SEERISK methodology and its application provide a useful tool for wildfire risk assessment. Given the high priority on protecting human life, crops and environment, the methodology we present here could have wide application across Serbia as well as in other countries facing similar hazards.szabadon elérhet

Potential of using ground-based high-power Lasers to decelerate the evolution of Space Debris in LEO

High-power lasers offer a unique potential for debris collision avoidance and orbit lowering for removal purposes within the debris mitigation scenario. Photon pressure and surface ablation are explored as suitable mechanisms to remotely apply the required velocity increment to debris targets. The appropriate regime of laser intensity and fluence, respectively, is discussed in terms of technical maturity and laser safety. Laser power beaming from ground to space is analysed considering atmospheric constraints like aerosol attenuation, cloud cover and turbulence including possibilities and limitations of technical counter-measures. Operational risks comprise uncertainties in momentum transfer as well as thermo-mechanical side effects highlighting the necessity of target reconnaissance. Moreover, making space debris touchable from ground might raise concerns of third parties regarding their own space assets not to be tackled by high-power lasers. Hence, the need for global governance of this approach for space debris mitigation is reflected

Conceptual Study on Laser Networks for Near‐Term Collision Avoidance for Space Debris in the Low Earth Orbit

Due to the increasing amount of space debris, several laser‐based concepts for orbit modification have been proposed in the recent years. Since the sparse availability of pulsed lasers with high energy (> 10 kJ) seems to render laser‐ablative debris nudging for collision avoidance into a solution only for the long run, alternative options which can be realized earlier are mandatory to counter the rapidly increasing number of space debris in low Earth orbit. In this regard, high‐power CW lasers (> 10 kW) have been proposed in the past for debris nudging by photon pressure. With momentum coupling being 3 – 4 orders of magnitude lower than in the case of laser ablation, this might appear as a poor alternative at first glance, but the opposite is the case when a greater number of laser stations are combined forming an international network for laser tracking and momentum transfer (LTMT). From this viewpoint, we report on our findings on photon momentum transfer to space debris from our work performed under the conceptual study LARAMOTIONS (SSA P3‐SST‐XV) funded by the European Space Agency (ESA) in the framework of ESA’s Space Situational Awareness Program. Commercial availability of high power CW lasers allows for the setup of a network of relatively cost‐efficient laser stations in the next decade. Such an LTMT network would serve for both momentum transfer to space debris as well as for high precision laser tracking as a prerequisite for conjunction alert assessment and high‐power laser beam pointing. Depending on the network size, geographical distribution of stations, orbit parameters and remaining time to conjunction, multi‐pass irradiation enhances the efficiency of photon momentum coupling by 1 – 2 orders of magnitude and has the potential to eventually yield a promisingly significant reduction of the collision rate in low Earth orbit

ChangingRISKS: Research challenges for the assessment and communication on possible effects of global changes on landslide risks

1 Pag.The project work is focused on two mountain study areas located in France (Barcelonnette Basin, South East France) and in Austria (district Waidhoffen/Ybbs, Lower Austria).These research areas, characterized by a variety of environmental, economical and social settings, are severely affected by landslides, and have experienced significant landuse modifications and human interferences over the last century. Preliminary results on the influence of changing landuse conditions and changing climate are presented through the application of a process-based modeling chain able to simulate transient groundwater hydrology and slope instability from observed and simulated climate data sets.Peer reviewe

Numerische Simulation einer Biomassebrennkammer mit FLUENT

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Hermann J. Pottmeyer, Der Glaube vor dent Anspruch der Wissenschaft. Die Konstitution über den katholischen Glauben « Dei Filius » des 1. Vatikanischen Konzils und die unveröffentlichten theologischen Voten der vorbereitenden Kommission, 1968

Promper W. Hermann J. Pottmeyer, Der Glaube vor dent Anspruch der Wissenschaft. Die Konstitution über den katholischen Glauben « Dei Filius » des 1. Vatikanischen Konzils und die unveröffentlichten theologischen Voten der vorbereitenden Kommission, 1968. In: Revue théologique de Louvain, 2ᵉ année, fasc. 1, 1971. p. 109