186,380 research outputs found
Gas discharges at radiofrequency as chemical reactors. I. The synthesis of HCN from Nitrogen and Methane at moderate pressures. Part 1
No full textDistribution and life strategy of the deep-sea crab Paromola cuvieri (Risso, 1816) (Brachyura, Homolidae) in the central Mediterranean Sea over twenty-five years over twenty-five years
No full textThe present study represents a new contribution to the knowledge on the distribution and life strategy of P. cuvieri in the central Mediterranean. During 71 experimental bottom trawl surveys carried out in the Northern Ionian Sea from October 1994 to July 2019 a total of 457 specimens was sampled from 91 to 1118 m in depth. The highest frequency of occurrence and density was observed in the 600–800 m depth range. The relationship between carapace length and depth was statistically significant showing a significant decrease in size with depth. The length-frequency distribution was unimodal for both sexes and there was a low number of small individuals. The most represented size classes for both sexes were between 50 and 130 mm Carapace Length (CL), with males significantly larger than females. The sex ratio by size showed an increase of males with increasing length. Of the sampled females, 50 were in ovigerous condition and 92 females were non ovigerous. P. cuvieri appears to have continuous reproduction throughout the year, with ovigerous females observed in all seasons, with the highest abundance in spring and winter and between 400 and 800 m of depth. The fecundity ranged between 138165 and 374453 eggs with a mean value of 217237 eggs. The eggs show a spherical shape and their mean size increased with maturity stage. Egg development appears to not be completely synchronous, and two patterns can be observed simultaneously. The relationships between CL/brood size and weight/brood size were highly sig- nificant. The relationships between width and hand-length of both chelae and Carapace Width (CW) for both sexes were highly significant. Time-series data showed a scanty abundance of P. cuvieri in the studied area with no trend over the period 1995–2019 with no significant trend over. Its preferential distribution on the middle slope was confirmed. Time-series data (1995-2019) showed a scanty abundance of P. cuvieri in the studied area with no signficant trend. Its preferential distribution on the middle slope was confirmed
Structural and optical investigation of plasma deposited silicon carbon alloys: Insights on Si-C bond configuration using spectroscopic ellipsometry
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Growth-Etching Competitive Mechanism Governing The Structure And Chemical Composition Of Plasma Deposited Silicon-Based Materials
No full textDEPOSITION RATE, ION-BOMBARDMENT AND GAP STATES DENSITY IN GLOW-DISCHARGE A-SI-H,F FILMS
No full textPhotoelectron spectroscopy study of amorphus silicon-carbon alloys deposited by plasma-enhanced chemical vapor deposition
No full textX-ray photoelectron spectroscopy (XPS) coupled with Fourier transform infrared (FTIR) and optical transmission spectroscopy (OTS) has been used for the characterization of silicon-carbon alloys (a-Si1-xCx:H, F) deposited via plasma, by varying the CH4 amount in SiF4-C-4-H-2 feeding mixture. XPS measurements have shown that carbon-rich a-Si1-xCx:H, F alloys include large amounts of fluorine (>11 at. %), which make the films susceptible to the air oxidation. In addition, the effect of the alloying partner carbon on the valence band (VB) and on the VB edge position of amorphous silicon is also described
Size evaluation of Delectopecten vitreus (Mollusca, Bivalvia) from Santa Maria di Leuca deep-water coral site (Ionian Sea).
No full textThe size of a Mediterranean population of the deep sea pectinid Delectopecten vitreus (Mollusca, Bivalvia) is discussed with respect to Atlantic counterparts. The Mediterranean specimens collected in the Ionian Sea at the Santa Maria di Leuca deep water coral site are characterized by a size smaller than Atlantic stocks
Plasma deposition of amorphous SiC:H,F alloys from SiF4-CH4-H-2 mixtures
No full textFluorinated and hydrogenated amorphous silicon-carbon alloys (n-SiC:H,F) are produced by glow discharge decomposition of SiF4-CH4-H-2 mixture. Small amount of CH4 in SiF4-H-2 mixture are enough to produce silicon carbon alloys having optical gap ranging between 1.8 and 2.6 eV. Materials, having 1.95 eV band gap and exhibiting optoelectronic properties typical of state of art a-SiC:H, are deposited under plasma modulation conditions
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