MOLYBDENUM DOPED CARBON AEROGELS WITH CATALYTIC POTENTIAL

Mo-doped carbon aerogels were obtained in the polycondensation reaction of aqueous resorcinol and formaldehyde by adding Mo-salt at two different stages of the synthesis: i) to the initial sol; ii) by incipient wetting impregnation of the supercritically dried polymer gel. Molybdenum added during the polymerization yielded a more compact gel structure with practically no mesoporosity. With post-impregnation, by contrast, mesopores of diameter 3-15 nm were generated. Carbonization appreciably enhanced the microporous character of both samples, but in the mesopore range their pore size distribution was conserved. The Mocontent of the samples was also different: Mo was lost during the solvent exchange before the supercritical drying (i.e., the Mo failed to bind chemically to the polymer matrix). The residual Mo congregated into 25-60 nm bulk clusters of α-Mo2C. In the other carbon aerogel, finely dispersed α-Mo2C and η-Mo3C2 crystals formed, of size 8-20 nm. On the surface of both carbons the Mo formed oxides. In the model test reaction (acetic acid hydroconversion) the catalytic activity of both carbon aerogels was enhanced by molybdenum. The more open pore structure, higher concentration and finer Mo distribution, as well as its chemical form, may all be responsible for the greater conversion and higher value products obtained with the post-impregnated sample

Kutatási jelentés a magyarországi kommunális szennyvíztisztító telepek energiahatékonysági vizsgálatának módszertani megalapozásához

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Abstracts from the 20th International Symposium on Signal Transduction at the Blood-Brain Barriers

https://deepblue.lib.umich.edu/bitstream/2027.42/138963/1/12987_2017_Article_71.pd

Az N-acetilcisztein hemodinamikai hatása és ischaemiás prekondicionálás máj ischaemia-reperfúzió modellen

Tanulmányunk célja volt megvizsgálni, hogy az ismételt ischaemiás prekondicionálás, illetve az N-acetilcisztein-terápia befolyásolják-e kedvező hemodinamikai hatásuk révén az ischaemiás-reperfúziós sérülést kutyamájban. Módszer: A kontrollcsoport (n=10) 60 perc májischaemián esett át, majd ezt követően 180 perc reperfúzióban részesült. Az N-acetilcisztein-csoport (n=5) intravénásan 150 mg kg–1 N-acetilciszteint kapott az ischaemia megkezdése előtt. A prekondicionált csoportba tartozó kísérleti állatok (n=5) ischaemiás prekondicionálásban részesültek (10 perc ischaemiás periódus után 10 perc reperfúzió, ismételve háromszor) a portalis triász lefogása előtt. Eredmények: Tizennyolc kísérleti állat élte túl a vizsgálati időszakot. Az N-acetilcisztein-csoportba tartozó kísérleti állatok közül egy kutya elhalt inotrop kezelésre nem reagáló keringési elégtelenség következében. A szívindex és az intrathoracicus vér volumenindexe szignifikánsan magasabb volt a prekondicionált csoportban a kontrollcsoporthoz viszonyítva, végig a vizsgálati periódus során. Következtetések: A kapott adatok arra engednek következtetni, hogy az ismételt ischaemiás prekondicionálás javíthat a hemodinamikai paramétereken, mindamellett az N-acetilcisztein-kezeléssel kapcsolatban nem tudtunk szignifikáns különbséget kimutatni. | The aim of the study was to investigate whether repeated ischemic preconditioning or N-acetylcystein (NAC) prevents ischemic-reperfusion injury as determined by having favourable hemodynamic effects during reperfusion in canine livers. Methods: The control group ( n = 10) underwent 60 minutes of hepatic ischemia followed by 180 minutes reperfusion. In the NAC group ( n = 5) 150 mg kg –1 of NAC was administered intravenously before inducing ischemia. In the preconditioned group ( n = 5) animals received ischemic preconditioning (10 minutes of ischemia followed by 10 minutes of reperfusion repeated three times) before clamping the portal triad. Results: 18 dogs survived the study period. One dog in the NAC group died due to circulatory failure unresponsive to inotropic drugs. The cardiac index and the intrathoracic blood volume index were significantly higher in the preconditioning group compared to the controls throughout the study period. Conclusions: Repeated ischemic preconditioning might improve hemodynamic parameters, whereas we were unable to find any significant differences between the groups regarding N-acetylcystein

Nuclear matter effects on J/ψ production in asymmetric Cu+Au collisions at √sN N =200 GeV.

We report on J/ψ production from asymmetric Cu+Au heavy-ion collisions at √sN N =200 GeV at the Relativistic Heavy Ion Collider at both forward (Cu-going direction) and backward (Au-going direction) rapidities. The nuclear modification of J/ψ yields in Cu+Au collisions in the Au-going direction is found to be comparable to that in Au+Au collisions when plotted as a function of the number of participating nucleons. In the Cu-going direction, J/ψ production shows a stronger suppression. This difference is comparable in magnitude and has the same sign as the difference expected from shadowing effects due to stronger low-x gluon suppression in the larger Au nucleus. The relative suppression is opposite to that expected from hot nuclear matter dissociation, since a higher energy density is expected in the Au-going direction