Search results for "ASTER"
showing 10 items of 2223 documents
Magmatic gas percolation through the old lava dome of El Misti volcano
2017
International audience; The proximity of the major city of Arequipa to El Misti has focused attention on the hazards posed by the active volcano. Since its last major eruption in the fifteenth century, El Misti has experienced a series of modest phreatic eruptions and fluctuating fumarolic activity. Here, we present the first measurements of the compositions of gas emitted from the lava dome in the summit crater. The gas composition is found to be fairly dry with a H2O/SO2 molar ratio of 32 ± 3, a CO2/SO2 molar ratio of 2.7 ± 0.2, a H2S/SO2 molar ratio of 0.23 ± 0.02 and a H2/SO2 molar ratio of 0.012 ± 0.002. This magmatic gas signature with minimal evidence of hydrothermal or wall rock int…
Pasaules Veselības organizācijas darbība Ebolas vīrusa epidēmijas laikā: novēršanas pasākumu un krīzes vadības izvērtējums
2018
Maģistra darba tēma ir Pasaules Veselības organizācijas darbība Ebolas vīrusa epidēmijas laikā: novēršanas pasākumu un krīzes vadības izvērtējums. Pētījuma mērķis ir: analizējot Ebolas vīrusa epidēmijas krīzi, identificēt PVO darbības trūkumus un gūtās mācības. Maģistra darba izpētes jautājums ir: Kādas PVO darbības trūkumus un gūtās mācības var konstatēt Ebolas vīrusa epidēmijas krīzes laikā. Maģistra darbā izmantota starptautiskā katastrofu pārvaldības teorija, kas ieskicē galvenos krīzes vadības elementus. Darba empīriskajā daļā ir analizēta PVO darbība Ebolas vīrusa epidēmijas laikā 2014.gadā, tiek apskatīti PVO vairāki aspekti un to pilnveidošanas nepieciešamība, kā arī dalībvalstu ies…
Distribution patterns of particulate trace metals in the water column and nepheloid layer of the Gulf of Riga.
2004
The dynamics (fate) of trace metals in suspended particulate matter within the Gulf of Riga has not yet been adequately addressed in the scientific literature. Therefore, during a two year period (2001-2002) samples of suspended particulate matter and surface sediments for trace metal analysis were collected in the Gulf of Riga and the Daugava river, and these data were combined with background information from the national marine monitoring program in Latvia. This paper presents a descriptive study of solid phase trace metals (aluminium, iron, cadmium, chromium, copper, manganese, nickel, lead and zinc) dynamics and their spatial distribution within the Gulf of Riga based on Principal Comp…
Towards bioarrays of cellular-like compartments for monitoring few molecular binding events
2016
The aim of this work is to artificially reproduce scalable cellular-like compartments on a chip, thus realizing specialized small volume systems to study the behaviour of interacting biomolecules by few binding events. In particular, we show an unprecedented solution-based protein-binding assay based on arrays of oil-confined water droplets containing protein targets, labelled ligands and other compounds.
Chemical composition of the essential oil of Phagnalon saxatile (L.) Cass. (Asteraceae) growing wild in Southern Italy
2005
Abstract The essential oil from aerial parts of Phagnalon saxatile (L.) Cass. (Asteraceae) was obtained by hydrodistillation. The oil content was 0.15% (v/w), on a dry weight basis. The oil composition was analyzed by GC and GC/MS. Altogether 66 compounds were identified accounting for 93.2% of the oil. Sesquiterpenes represent the 23.9% of the oil. In the oil were also present fatty acids (21.8%) and waxes (19.3%). The oil shows no antibacterial activity.
Experimental introgression to evaluate the impact of sex specific traits onDrosophila melanogasterincipient speciation
2019
ABSTRACTSex specific traits are involved in speciation but it is difficult to determine whether their variation initiates or reinforces sexual isolation. In some insects, speciation depends of the rapid change of expression in desaturase genes coding for sex pheromones. Two closely related desaturase genes are involved inDrosophila melanogasterpheromonal communication:desat1affects both the production and the reception of sex pheromones whiledesat2is involved in their production in flies of Zimbabwe populations. There is a strong asymmetric sexual isolation between Zimbabwe populations and all other “Cosmopolitan” populations: Zimbabwe females rarely copulate with Cosmopolitan males whereas…
Dzieje Kościoła katolickiego w powiecie wieluńskim (1918–1939)
2021
Zakończenie I wojny światowej stało się początkiem nowego okresu w dziejach nie tylko narodów, ale także społeczności Kościoła katolickiego w wymiarze regionalnym. Wówczas rozpoczęła się jego nieskrępowana działalność, która była ukierunkowana na odbudowę duszpasterstwa i szeroko rozumianą pracę społeczną. W tym okresie w niezmienionych granicach powiatu wieluńskiego znajdowały się cztery dekanaty (bolesławiecki, praszkowski, wieluński i wieruszowski) oraz trzy parafie z dekanatu brzeźnickiego. W 1918 r. łącznie na tym terytorium znajdowało się 39 parafii. Rozwój demograficzny i religijny spowodował powstanie w okresie międzywojennym kolejnych 13 placówek duszpasterskich. Pod względem admin…
Competitive selection in mono-, di- and tri-genotype cultures of Drosophila melanogaster
2009
Viability and larva-to-adult development of three strains of Drosophila melanogaster (one wild strain and two eye mutant strains: cardinal and sepia) were studied under three different situations: A. Monocultures of wild, cardinal and sepia respectively. B. Dicultures with the combinations wild/cardinal, wild/sepia and cardinal/sepia respectively. Seven points of different genetical composition were chosen for each of the three systems. C. Tricultures with wild/cardinal/sepia. Seventy composition points were chosen. The points arranged in a three dimensional diagram with the axes wild, cardinal and sepia, make up an equilateral triangle hyperplane. An analysis of optimal density and intrins…
Flying Laser Spot Thermography technique for the NDE of Fibre Metal Laminates disbonds
2017
Abstract The present work investigates the features of an active Infrared-NDT Thermography technique derived from a Flying Laser Spot set-up for the analysis of interlaminar disbonds in layered structures in general and Fibre Metal Laminates in particular. The presented technique uses a laser-spot heat source, which moves at a constant speed, raster scanning the object surface. Interlaminar defects parallel to the surfaces act as barriers towards through-the-thickness heat diffusion. This produces some modifications over the surface thermal field which are well identified in the Standard Deviation calculated over a Reference Area following the heat source. The mechanisms leading to such def…
Zero-range model of traffic flow.
2005
A multi--cluster model of traffic flow is studied, in which the motion of cars is described by a stochastic master equation. Assuming that the escape rate from a cluster depends only on the cluster size, the dynamics of the model is directly mapped to the mathematically well-studied zero-range process. Knowledge of the asymptotic behaviour of the transition rates for large clusters allows us to apply an established criterion for phase separation in one-dimensional driven systems. The distribution over cluster sizes in our zero-range model is given by a one--step master equation in one dimension. It provides an approximate mean--field dynamics, which, however, leads to the exact stationary s…