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001-es BibID:	BIBFORM008875
Első szerző:	Erdélyi Zoltán (fizikus)
Cím:	On the determination of the equilibrium surface segregation isotherms form kinetic measurements / Z. Erdélyi, A. Taranovskyy, D. L. Beke
Dátum:	2009
ISSN:	1606-5131
Megjegyzések:	Thirty years ago, Lagues and Domange [1] studying dissolution and segregation kinetics, introduced the s urface local equilibrium hypothesis. This hypothesis is based on the idea that the kinetics (diffusion) is faster in the near surface region (selvedge) than in the bulk and thus it can be assumed that the atoms just below the selvedge can be in equilibrium with the atoms of the deposit. In this contribution, based on our recent work [2], using three dimensional kinetic Monte Carlo (KMC) and one dimensional kinetic mean filed (KMF) models, we show that the local equilibrium can be violated even in simple cases when complex surface phenomena (defects, relaxation, size effects, etc.) are not taken into account. Furthermore we illustrate that, even if the above hypothesis is obeyed, the determination of the surface segregation isotherms from kinetics can lead to uncertain result because of the restricted validity of Fick's first equation on the nanoscale.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Reviews on Advanced Materials Science . - 21 : 1 (2009), p. 6-17. -
További szerzők:	Taranovskyy, Andriy Beke Dezső László (1945-) (fizikus)
Internet cím:	elektronikus változat
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001-es BibID:	BIBFORM119493
035-os BibID:	(cikkazonosító)2400118
Első szerző:	Farkas Vajk
Cím:	"Inverted" Cyclic(Alkyl)(Amino)Carbene (CAAC) Ruthenium Complex Catalyzed Isomerization Metathesis (ISOMET) of Long Chain Olefins to Propylene at Low Ethylene Pressure / Vajk Farkas, Dániel Csókás, Ádám Erdélyi, Gábor Turczel, Attila Bényei, Tibor Nagy, Sándor Kéki, Imre Pápai, Róbert Tuba
Dátum:	2024
ISSN:	2198-3844
Megjegyzések:	Isomerization Metathesis (ISOMET) reaction is an emerging tool for "open loop" chemical recycling of polyethylene to propylene. Novel, latent N-Alkyl substituted Cyclic(Alkyl)(Amino)Carbene (CAAC)-ruthenium catalysts (5a-Ru, 3b-Ru - 6c-Ru) are developed rendering "inverted" chemical structure while showing enhanced ISOMET activity in combination with (RuHCl)(CO)(PPh3)3 (RuH) double bond isomerization co-catalyst. Systematic investigations reveal that the steric hindrance of the substituents on nitrogen and carbon atom adjacent to carbene moiety in the CAAC ligand have significantly improved the catalytic activity and robustness. In contrast to the NHC-Ru and CAAC-Ru catalyst systems known so far, these systems show higher isomerization metathesis (ISOMET) activity (TON: 7400) on the model compound 1-octadecene at as low as 3.0 bar optimized pressure, using technical grade (3.0) ethylene. The propylene content formed in the gas phase can reach up to 20% by volume.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk inverted CAAC ISOMET metathesis propylene ruthenium
Megjelenés:	Advanced Science. - 11: -(2024), p.1-9. -
További szerzők:	Csókás Dániel Erdélyi Ádám Turczel Gábor Bényei Attila (1962-) (vegyész) Nagy Tibor (1988-) (vegyész) Kéki Sándor (1964-) (polimer kémikus) Pápai Imre Tuba Róbert
Pályázati támogatás:	GINOP-2.3.3-15-2016-00004 GINOP TKP2021-NKTA-34 Egyéb 2021-1.2.4-TÉT-2021-00021 Egyéb
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001-es BibID:	BIBFORM048176
Első szerző:	Tóth Csaba Albert (geográfus)
Cím:	Wind and sheet erosion investigations in sample areas in the Nyírség / Tóth Csaba Albert, Négyesi Gábor, Lóki József, Szabó Gergely, Buró Botond
Dátum:	2013
ISSN:	2347-4130
Megjegyzések:	We carried out wind erosion measurements in the field on three sample areas in Nyírség region, and in wind tunnel. During examinations we measured the erosion and accumulation of soil and studied the process, spatial and time pattern of wind and sheet erosion in areas in various geomorphological settings cultivated intensely with different topsoil conditions and with different commercial plant cultures. The surface changes measured in the field measurements verified the fact, that the rate of surface transformation is bigger on bare plough-land, than surfaces are covered by vegetation. The mechanical composition of soils played important role: where soil crust was forming out on the surface, the amount of eroded material was smaller. Erodibility data obtained from wind-tunnel measurements are in accordance with those measured in the field surveys, i.e. the 2-2.5 cm of material loss measured in laboratory were supported by the field measurements. In wetter periods linear and areal erosion of flowing precipitation water had major role in shaping sand surfaces. The performed sheet erosion studies yielded more-or-less similar material loss values, i.e. 0.5-1 cm of material is denuded annually on average from the cultivated wind-blown sand surfaces.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban wind erosion Nyírség sheet erosion
Megjelenés:	Advanced Research in Engineering Science. - 1 : 1 (2013), p. 2-8. -
További szerzők:	Négyesi Gábor (1980-) (geográfus) Lóki József (1946-) (geográfus) Szabó Gergely (1975-) (geográfus) Buró Botond (1986-) (geográfus)
Pályázati támogatás:	OTKA K 83560 OTKA TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM048178
Első szerző:	Túri Zoltán (geográfus)
Cím:	Spatiotemporal analysis of the hydrological factors in the subcatchment of the river Tisza, Ne Hungary / Túri Zoltán, Négyesi Gábor, Türk Gábor, Lóki József, Balázs Boglárka, Szabó Szilárd
Dátum:	2013
ISSN:	2347-4130
Megjegyzések:	Research on spatial and temporal changes of hydrological elements of the environment is an important issue of most emerging tasks due to the possible trends of the climate change. In this study we investigated a catchment (Canal Lónyay-főcsatorna) whichwas situated on the northeastern part of Hungary, in the Nyírségmezoregion. We examined some characteristic features of the hydrological elements (precipitation, surface and ground water). To achieve our aims, data measured in hydro-meteorological stations and groundwater gauging wells between 1950-2005, as well as data measured in water-gauges between 1980-2005 were used. We analysed the datasetwith statistical and GIS methods and we illustrated the results on maps and diagrams. About 540-650 mm precipitation was measured on the watershed of Lónyay canal. The effect of the relief was identified in the regional distribution of precipitation. According to the minimum precipitation map, the driest region was the southwestern part of the Lónyay-watershed area. This fact was the consequence of the relative location of the area in a basin (Carpathian Basin with the surrounding mountains). According to our observations the anthropogenic effects presumably does not exceed the influences of natural processes. The connection between gauging wells far from each other indicates regional scale changes on the watershed area.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban Hungary Canal Lónyay-főcsatorna Water Framework Directive precipitation freshwater groundwater hydrometeorology Doktori iskola
Megjelenés:	Advanced Research in Engineering Science. - 1 : 2 (2013), p. 43-51. -
További szerzők:	Négyesi Gábor (1980-) (geográfus) Türk Gábor (1987-) (biológia környezettan tanár) Lóki József (1946-) (geográfus) Balázs Boglárka (1985-) (geográfus) Szabó Szilárd (1974-) (geográfus)
Pályázati támogatás:	OTKA K 83560 OTKA TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP TÁMOP-4.2.2/B-10/1-2010-0024 TÁMOP Földtudományok Doktori Iskola
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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