Pojava Istarske obalne protustruje u 2000. godini, u kojoj su opažene i sluzave nakupine

The Istrian Coastal Countercurrent (ICCC) appeared in March (7 cm/s), August and September (4 cm/s) 2000, and a mucilage event occurred during late June-early July. Remarkably, previous investigations indicated that recurrent occurrences of intense ICCC coincided with mucilage and/or anoxia events in the region. In fact, already during late winter, when a sea heat gain was relatively intense, a significant transversal transport of freshened waters of Po origin occurred. Lower salinity and warmer water pool, which might be the core of an anticyclonic gyre in the northeastern Adriatic, was present also during spring and summer. This indicates the establishment of a pronounced closed circulation system in the area.Istarska obalna protustruja (IOPS) pojavila se u ožujku (7 cm/s), kolovozu i rujnu (4 cm/s) 2000. godine, a pojava sluzavih nakupina opažena je tijekom kasnog lipnja i početkom srpnja. Prema ranijim istraživanjima, povremene pojave IOPS podudarale su se s pojavom sluzavih nakupina i/ili anoksije u ovom području. Već tijekom kasne zime, kada je more iz atmosfere primalo razmjerno veliku količinu topline, opažen je značajan transverzalan prijenos zaslađenih voda porijeklom iz Poa. Bazen zaslađene i toplije vode, koji bi mogao biti središte anticiklonalnog vrtloga u istočnom dijelu sjevernog Jadrana, bio je prisutan i tijekom proljeća i ljeta. To ukazuje na postojanje zatvorenog sustava cirkulacije u promatranom području

Annealing of gold nanostructures sputtered on polytetrafluoroethylene

Gold nanolayers sputtered on polytetrafluoroethylene (PTFE) surface and their changes induced by post-deposition annealing at 100°C to 300°C are studied. Changes in surface morphology and roughness are examined by atomic force microscopy, electrical sheet resistance by two point technique, zeta potential by electrokinetic analysis and chemical composition by X-ray photoelectron spectroscopy (XPS) in dependence on the gold layer thickness. Transition from discontinuous to continuous gold coverage takes place at the layer thicknesses 10 to 15 nm and this threshold remains practically unchanged after the annealing at the temperatures below 200°C. The annealing at 300°C, however, leads to significant rearrangement of the gold layer and the transition threshold increases to 70 nm. Significant carbon contamination and the presence of oxidized structures on gold-coated samples are observed in XPS spectra. Gold coating leads to a decrease in the sample surface roughness. Annealing at 300°C of pristine PTFE and gold-coated PTFE results in significant increase of the sample surface roughness