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  • Author or Editor: Cs. Németh x
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215 type specimens of 38 Sorbus taxa (15 holotypes, 23 lectotypes and 177 other types) described by Sándor Jávorka, Ádám Boros and Zoltán Kárpáti from the Carpathian Basin and the Carpathians have been examined. Types are designated here, and 15 names validly published.

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Two new species of the genus Sorbus are described from Hungary, illustrations and their distributions are presented. Both belong to nothosubgenus Tormaria (Sorbus latifolia group), putative hybridogenous apomictic species originated from a cross between a member of S. aria group and S. torminalis and occur sympatrically in dolomite slopes of the Bakony Mts (NW Hungary). One of them S. barabitsii is a stenoendemic species to the hill Malom-hegy above villages Márkó and Bánd where it grows in mixed forests of scree rocky slopes (Primulo veris-Tilietum) and in mixed karstic forests (Fago-Ornetum) of the north-facing slopes accompanied by other Sorbus species, such us S. aria, S. danubialis, S. graeca, S. pannonica, S. torminalis, as well as the local endemism S. veszpremensis. Population of the other species S. polgariana occurs in the valley Burok-völgy nearby town Várpalota (Királyszállás), where the majority of the individuals grow in mixed karstic forests (Fago-Ornetum), rocky beech forests (Daphno laureolae-Fagetum) and in the margin of closed thermophilous oak woodlands (Vicio sparsiflorae-Quercetum pubescentis) as well. This species grows sympatrically with Sorbus aria, S. danubialis, S. graeca, S. pannonica, S. redliana and S. torminalis.

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Abstract  

A method for the preconcenration of strontium on loaded and unloaded polyurethane foams is described. Parameters affecting the extraction of metal ion, such as pH, reagent concentration and background medium have been investigated. The method can be applied to preconcentrate strontium from aqueous samples.

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Abstract  

Coals mined in some regions of the Transdanubian Middle Mountains in Hungary have elevated concentrations of natural radionuclides as238U,226Ra, etc. Therefore, coal slags and ashes used for insulation of the school buildings may lead to high dose contributions on the students. In the city of Tatabánya one school was found where the external dose rates in the classrooms were of 500–900 nGy/h. In spite of the high external dose rates, the radon concentrations measured were small usually less than 100 Bq/m3.

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Abstract  

A significant dose contribution on the population could be derived from coal slags used as isolation material. Extremely high natural activities are measured in the coal slag, derived from the region of the settlement Ajka, Hungary. In some buildings monitored, the elevated -doses were nearly 5–10 times higher than the world average ones. The annual average indoor radon concentrations from the slag exceeded 400 Bq/m3 and in some cases up to 1200 Bq/m3. Due to the elevated exposure and the radon concentrations in the dwellings the annual dose was estimated to 8–24 mSv/y more than 5–10 times of the world average one.

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Abstract  

Slags, derived from coal mined in the neighbourhood of the town Tatabánya in Hungary, have been used as filling and insulating material for buildings of houses, block of flats, schools and kindergartens. The slag samples come from here have elevated concentrations of 226Ra, (range of 850–2400 Bq·kg–1). Therefore, the external gamma dose rates at 1 m height were about four times higher than the world average. It has been found, based on the modelling, that the dose rate could be decreased with 70–80% using an appropriate thickness of concrete or barite-concrete layers.

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Summary  

Due to the rocky neighborhood, consisting of mostly granite with high radium content, an elevated radon concentration was found in a territory of Gifu prefecture situated in the middle of Japan. Radon concentrations in water were measured and were found to be considerably high. Since indoor radon and radon progeny concentrations might be relatively high, their concentrations were also analyzed. Besides the radon and radon progeny, thoron and thoron progeny concentrations were also investigated. Dose estimations for radon and thoron in indoor air are discussed.

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Abstract  

A frequently used method in determining the radium concentration of water is the radon emanation method. When radon gas is transferred to the Lucas-cell usually CaCl2 is used to remove the water traces. When we measured the background of the system using ultra clear distilled water the results were astonishing. The detailed investigation has shown that the unwanted radon originated from the CaCl2, contained about 1000 Bq/kg of 226Ra. Depending on the time interval between two measurement, the radon deriving from the CaCl2 disturbed the measurements.

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Abstract  

222Rn and 226Ra concentration of 18 frequently visited and regularly used, consumed spring waters on the Balaton Uplands have been measured by radon emanation method and alpha-spectrometry. 222Rn concentration varied between 1.5-55 Bq/l while 226Ra concentration between -601 mBq/l. The expected dose, between 14.1-119 mSv/y, has been assessed from the value of concentration supposing a daily consumption of 1 liter.

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Treatment with various concentrations (0, 5, 15 and 20%) of PEG was used to simulate water stress, followed by inoculation with Drechslera tritici-repentis (DTR) at two different points of time (6 and 72 h after the PEG treatment) in two DTR resistant (M-3 and Mv Magvas) and two sensitive (Bezostaya 1 and Glenlea) wheat varieties. The reduction in biomass production due to the PEG treatments was more pronounced in the shoots than in the roots. While in the case of Bezostaya 1 5% PEG reduced the level of infection, 20% PEG treatment lowered the tolerance level of M-3. DTR infection may be more efficient in inducing antioxidative defence systems than water stress. However, there was no direct correlation between the activity of the individual antioxidant enzymes and the drought or DTR tolerance of wheat plants.

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