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Search Results: 1 - 10 of 198 matches for " MATIJA ZORN "
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STATISTICAL LANDSLIDE SUSCEPTIBILITY MODELING ON A NATIONAL SCALE: THE EXAMPLE OF SLOVENIA
BLA? KOMAC,MATIJA ZORN
Revue Roumaine de Géographie , 2009,
Abstract: Zur Zeit, gibt es ungef hr 6,600 aufgezeichnete Erdrutschungen (ungef. 0,4 pro km2) in Slowenien, aber man nimmt an dass es rund 10,000 aktive Erdrutschungen (ungef. 0,5 pro km2) gebe. Allerdings, kaum ein Viertel dieser Erdrutschungen stellen eine Gefahr für die Infrastruktur und Geb ude dar. Erdrutschungen sind natürliche Prozesse die schwer aufzuhalten sind. Daher, geeignete Anpassung ist oft der gr te begrenzende Faktor für st dtische und wirtschaftliche Entwicklung. Im Durchschnitt, betragen die Sch den, die mit natürlichen Katastrophen in Slowenien zusammenh ngen, j hrlich zwei oder drei Prozente des slowenischen BIP, aber sie k nnen im Falle von individuellen gro en natürlichen Ph nomenen viel h her sein. Wohlüberlegte Sicherheitsma nahmen würden h chstwahrscheinlich die Kosten der Wiederstabilisierung senken, aber es gibt noch keine gemeinsame Strategie und Regelungen um diese Ereignisse anzugehen. Naturgefahrenkarten stellen einen der wichtigsten Schritte gegen eine effektive Strategie dar, die Erdrutschungen sowie andere Massenbewegungen zu kontrollieren. Daher, haben wir drei Rutschungsgefahrenkarten für das Gebiet der Republik Slowenien angefertigt mit der Hilfe eines deterministischen Modells und zweier statistischer Modelle. Ein paar Vergleiche von Methoden und deren Ergebnissen werden in der Arbeit besprochen.
Rockwall retreat on badlands in Slovene Istria
Matija Zorn,Matja? Miko?
Geologija , 2008,
Abstract: Steep bare rocky slopes that are badlands at the same time, are a morphogenetic particularity of the flyschpart of the Istrian Peninsula. On them, microrelief forms are of a short life cycle, since erosion processes are fast. On the basis of measurements of sediment production in flysch rocks on fourerosion plots in the Rokava watershed situated south of the village of Marezige, we show in this paper how fast these processes are. The annual sedimentproduction in flysch rocks is on average around 80kg/m2, which means that the slope retreat rate is about 35 mm/year.Further more, weekly measurements of sediment production in flysch rockf or the period of 15 months(from February 2005 till April 2006) are shown, as well as weekly and seasonal averages. Linear statistical correlations between sediment production in flysch rocks and weather conditions are also presented.
Soil erosion in Slovene Istria
Matija Zorn,Matja? Miko?
Geologija , 2009,
Abstract: From the end of nineties of the 20th century, intense hydrologic and geomorphologic research is taking place in the Slovene Istria. As a part of this research also studies on soil erosion were undertaken in the period from 2005 to 2008. The field measurements were under taken onclosed 1m2 large erosion plots under three different land uses (on bare soils in an olive grove, on an overgrown meadow, in a forest), placed south of the Marezige village in the Rokava River basin.We show weekly measurements of surface erosion (interrill erosion) for the period of 13 months (the end of March 2005 – the end of April 2006), as well as monthly and seasonal averages together with selected linear statistical correlations between soil erosion and weather parameters.From May 2005 to April 2006 the interrill erosion on bare soils in an olive grove with an inclination of 5.5° amounted to 9013 g/m2 (90 t/ha) that corresponds to surface lowering rate of 8.5 mm/yr; on an overgrown meadow with an inclination of 9.4° it amounted to 168 g/m2 (1,68 t/ha) that corresponds to surface lowering rate of 0.16 mm//yr; and in a forest with an inclination of 7.8° it amounted to 391 g/m2 (3,91 t/ha) and in a forest with an inclination of 21.4° it amounted to 415 g/m2 (4,15 t/ha), respectively, that corresponds to surface lowering rate of 0.4 mm/yr.
Geomorphology and spatial planning
Matija Zorn,Bla? Komac
Urbani Izziv , 2006,
Abstract: Applicability of geomorphological knowledge for prevention against some natural disasters, also known as geomorphological disasters, is presented. Some home and foreign experience of applicability of this knowledge are introduced. It is known that the ratio between means put into sanitation of, for example, landslides and savings with prevention measures, are from 1:10 to 1:2.000. The use of geomorpholgical knowledge and corresponding cartographic works in Slovene spatial planning legislation is defined, but it is not carried out consistently. We recommend municipalities and spatial planners that they should also take in account geomorphic processes and characteristic of the relief.
Geomorfologija in prostorsko planiranje
Matija Zorn,Bla? Komac
Urbani Izziv , 2006,
Abstract: V lanku predstavljamo uporabnost geomorfolo kega znanja za preventivo pred nekaterimi naravnimi nesre ami, ki jih imenujemo tudi geomorfolo ke nesre e. Opisujemo doma e in tuje izku nje pri aplikaciji tovrstnega geomorfolo kega znanja. Znano je, da razmerje med sredstvi, vlo enimi v sanacijo zemeljskih plazov, in prihranki zaradi preventive ponekod zna a od 1:10 do celo 1:2000. Uporaba geomorfolo kega znanja in ustreznih kartografskih podlag pri prostorskem planiranju je v Sloveniji sicer opredeljena v zakonodaji, a se ne izvaja dosledno. Naro nikom (ob inam) in izvajalcem (izdelovalcem planov) v prispevku predlagamo, da pri na rtovanju razvoja prostora bolj upo tevajo geomorfne procese in zna ilnosti reliefa.
Merjenje malih alpskih ledenikov: primeri iz Slovenije in Avstrije ; Measurements of small alpine glaciers: examples from Slovenia and Austria
Mihaela Triglav ?ekada,Matija Zorn,Viktor Kaufmann,Gerhard Karl Lieb
Geodetski Vestnik , 2012,
Abstract: In the last century and a half, average summer temperatures have slowly been rising worldwide. The most observable consequence of this is the change in glacier sizes. For monitoring glacier area and volume, various measuring techniques exist—from measurements with a measuring tape and geodetic measurements to remote sensing and photogrammetry. A comparison of different measuring techniques on twoSlovenian glaciers (the Triglav and Skuta glaciers) and two Austrian glaciers (the Gossnitzkees and Hornkees glaciers) is made. A long-term glacial retreat trend is presented for the Gossnitzkees, Hornkees, and Triglav glaciers because these glaciers can be monitoredthroughout the entire twentieth century by means of archival data. Despite their different sizes, the annual trend of glacial retreat was approximately the same in the period between 1929 and 2006 ; V zadnjem stoletju in pol se globalne povpre ne letne temperature stalno dvigajo. Ena od vidnih posledic tega je spreminjanje velikosti ledenikov. Za spremljanje povr inskih in prostorninskih sprememb ledenikov obstajajo tevilne metode, od meritev z merskim trakom, klasi nih geodetskih izmer do daljinskega zaznavanja in fotogrametrije. Uporaba nekaterih je predstavljena na dveh slovenskih (Triglavski ledenik, Ledenik pod Skuto) in dveh avstrijskih ledenikih (Gossnitzkees in Hornkees). Predstavljen je tudi dolgoro en trend zmanj evanja ledenikov Gossnitzkees, Hornkees in Triglavskega ledenika, ki ga na podlagi razli nih arhivskih podatkov lahkospremljamo e od za etka 20. stoletja. eprav so obravnavani ledeniki razli no veliki, izkazujejo primerljiv letni trend zmanj evanja v obdobju med letoma 1929 in 2006.
à la recherche du 1 % : que nous apprennent les travaux d’Atkinson, Piketty et Saez sur la concentration des hauts revenus ?
Nicolas Zorn
Interventions économiques , 2012,
Abstract: Les inégalités de revenu se font croissantes dans la plupart des pays avancés et la richesse se concentre davantage au sommet de la pyramide sociale. Les deux principaux courants de pensée, l’école institutionnaliste et l’école du marché, peinent à expliquer pourquoi la hausse des inégalités de revenus se concentre principalement dans le centile le plus fortuné. Partant de ce constat, un nouveau courant de pensée s’est plut t concentré, à l’instigation entre autres d’Atkinson, Piketty et Saez, sur les statistiques fiscales des très hauts revenus, fortement sous-estimés dans les enquêtes par sondage. Cet article présente une synthèse critique de leurs hypothèses, de leur méthodologie et de leurs résultats. Income inequalities are increasing in most advanced countries and most of the wealth has become concentrated at the top of the social pyramid. Institutionalist and market-based theories, the two main schools of thought on the subject, struggle to explain why the rise in income inequality is mainly concentrated in the most fortunate percentile. Based on this observation, Atkinson, Piketty and Saez have opened a new field of study specifically on top incomes (severely underestimated in surveys), based on tax statistics. This article presents a critical overview of their assumptions, their methodology and results.
Contribution to the Knowledge of the Ore Clasts from the Novo okno Orebody in the Bor Copper Deposit
Matija Drovenik
Geologija , 1992,
Abstract: In the Bor copper deposit, Eastern Serbia, the metasomatic and stockwork orebodies are situated in the hydrohermally altered Upper Cretaceous andésitesand their pyroclasts. Along the southern border of the altered zone occurs in thefresh Upper Cretaceous andesitic pyroclasts the l e n t i c u l a r orebody Novo oknowhich includes beside various andesitic clasts also ore clasts ejected by thesynchronous volcanic eruption. In t h e central p a r t of the orebody the ore clastsinclude p r e d o m i n a n t l y pyrite, r h o m b i c chalcocite a n d covellite. The c e n t r a l p a r t iss u r r o u n d e d by t h e ore i n which t h e ore clasts show very often concentric i n t e r n als t r u c t u r e . They contain in a d d i t i o n to pyrite p a r t i c u l a r l y bornite, as well aschalcopyrite, a n d at g r e a t e r d i s t a n c e s only chalcopyrite. The a u t h o r considers t h att h e concentric internal s t r u c t u r e of t h e mentioned clasts originated during the diagenesis, and t h a t b o t h b o r n i t e a n d c h a l c o p y r i t e are of diagenetic origin.
Chronology and Sources of Lunar Impact Bombardment
Matija ?uk
Physics , 2011, DOI: 10.1016/j.icarus.2011.11.031
Abstract: The Moon has suffered intense impact bombardment ending at 3.9 Gyr ago, and this bombardment probably affected all of the inner Solar System. Basin magnetization signatures and lunar crater size-distributions indicate that the last episode of bombardment at about 3.85 Gyr ago was less extensive than previously thought. We explore the contribution of the primordial Mars-crosser population to early lunar bombardment. We find that Mars-crosser population initially decays with a 80-Myr half-life, with the long tail of survivors clustering on temporarily non-Mars-crossing orbits between 1.8 and 2 AU. These survivors decay with half-life of about 600 Myr and are progenitors of the extant Hungaria asteroid group in the same region. We estimate the primordial Mars-crosser population contained about 0.01-0.02 Earth masses. Such initial population is consistent with no lunar basins forming after 3.8 Gya and the amount of mass in the Hungaria group. As they survive longer and in greater numbers than other primordial populations, Mars-crossers are the best candidate for forming the majority of lunar craters and basins, including most of the Nectarian system. However, this remnant population cannot produce Imbrium and Orientale basins, which formed too late and are too large to be part of a smooth bombardment. We propose that the Imbrian basins and craters formed in a discrete event, consistent with the basin magnetization signatures and crater size-distributions. This late "impactor shower" would be triggered by a collisional disruption of a Vesta-sized body from this primordial Mars-crossing population (Wetherill, 1975) that was still comparable to the present-day asteroid belt a 3.9 Gya. This tidal disruption lead to a short-lived spike in bombardment by non-chondritic impactors with a non-asteroidal size-frequency distribution, in agreement with available evidence. [abridged]
Non-random overshoots of Lévy processes
Matija Vidmar
Mathematics , 2013,
Abstract: The class of Levy processes for which overshoots are almost surely constant quantities is precisely characterized.
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