101 research outputs found

    Intra-regional and long-range ragweed pollen transport over southern Hungary

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    ÖsszefoglalĂĄs - A tanulmĂĄny cĂ©lja, hogy a hossztĂș tĂĄvĂș parlagfƱ pollen szĂĄllĂ­tĂĄs szerepĂ©t elemezze Szeged fölött, DĂ©lmagyarorszĂĄg tĂ©rsĂ©gĂ©ben a napi pollenkoncentrĂĄciĂłk 15 Ă©ves (1989-2003) adatbĂĄzisa alapjĂĄn.. A szĂĄllĂ­tott Ă©s a helyi eredetƱ parlagfƱ pollen szemeket oly mĂłdon vĂĄlasztottuk szĂ©t, hogy a helyi parlagfƱ virĂĄgzĂĄsa elƑtt mĂ©rt parlagfƱ koncentrĂĄciĂłkat nem helyi eredetƱnek tekintettĂŒk. Ezt követƑen elemeztĂŒk egyrĂ©szt a helyi parlagfƱ virĂĄgzĂĄ- sa elƑtti idƑszak hĂĄrom legnagyobb pollenterhelĂ©sƱ napjĂĄnak, mĂĄsrĂ©szt a vizsgĂĄlt idƑszak hĂĄrom legnagyobb ĂĄtlagos pollenterhelĂ©sƱ napjĂĄnak hĂĄrom- Ă©s hĂ©tnapos, idƑben visszafelĂ© szĂĄmĂ­tott (backward), trajektĂłriĂĄit. A fenti kivĂĄlasztott napokra alkalmaztuk a HYSPLIT-modellt azon cĂ©lbĂłl, hogy kiszĂĄmĂ­tsuk a parlagfƱpollen szemek trajektĂłriĂĄit, s meghatĂĄrozzuk azok forrĂĄsterĂŒleteit. A kapott trajektĂłriĂĄk azt mutatjĂĄk, hogy amikor nincs helyi pollenszĂłrĂĄs DĂ©lmagyarorszĂĄg tĂ©rsĂ©gĂ©ben, akkor a RhƑne-völgyĂ©bƑl (FranciaorszĂĄg), Észak-OlaszorszĂĄgbĂłl Ă©s HorvĂĄtorszĂĄgbĂłl Ă©rkezhet parlagfƱ pollen DĂ©lmagyarorszĂĄg fölĂ©. MĂĄsrĂ©szrƑl, a hĂĄrom legsĂșlyosabb ĂĄtlagos pollenterhelĂ©sƱ nap mindegyikĂ©nek a trajektĂłriĂĄi ĂĄthaladnak a Duna-Tisza köze fölött, ami parlagfƱvel Ă©s pollenjĂ©vel az egyik leginkĂĄbb fertƑzött terĂŒletnek szĂĄmĂ­t MagyarorszĂĄgon. KövetkezĂ©skĂ©pp, a legsĂșlyosabb pollenterhelĂ©sƱ napokon a szĂĄllĂ­tott pollen tovĂĄbb emelheti DĂ©lmagyarorszĂĄg fölött a levegƑ pollenkoncentrĂĄciĂłjĂĄt. Summary - The aim of the study was to analyse the role of long-range transport of ragweed pollen over Szeged City, Southern Hungary on the basis of the daily pollen levels for the 15-year period between 1989-2003. Transported and local pollen grains were separated; ragweed pollen levels measured before the blooming of local ragweed were considered to be of transported origin. Then, 3-day and 7-day backward trajectories belonging partly to the three days having the highest pollen levels before the blooming period of ragweed and partly belonging to the three days having the highest average peak concentrations in the period were examined. For the days selected above, the HYSPL1T model was applied in order to calculate trajectories of airborne ragweed pollen grains, as well as to detect their source areas. The resulting trajectories show that when there is no release of ragweed pollen grains in Szeged and its surroundings, then ragweed pollen may come over the Szeged region from the Rhönevalley (Southern France), Northern Italy and Croatia. On the other hand, each of the trajectories, belonging to the three days having in average the three highest pollen levels during the 15-year period examined (1989-2003), passes through the region between the rivers Danube and Tisza, considered to be one of the areas most polluted with ragweed pollen in Hungary. Hence, transported pollen on the most heavily polluted days can further raise the airborne ragweed pollen concentrations over Southern Hungary

    Vehicle Dynamic Simulation Possibilities Using AVL Cruise M

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    In most cases, when creating vehicle dynamics simulations, we need software that can speed up model creation and simulation. There are many programs on the market for this purpose, but they have different knowledge and user interfaces. We present in this article briefly introduces the use of one of the market's leading vehicle simulation software, the AVL Cruise M
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