Search results for "backscatter"

showing 3 items of 123 documents

Distribution and spatial structure of pelagic fish schools in relation to the nature of the seabed in the Sicily Channel (Central Mediterranean).

2009

Hydroacoustic data collected during two echosurveys carried out in the Sicily Channel in 1998 and 2002 were analysed to investigate the distribution and spatial structure of small pelagic fish species in relation to the sedimentological nature of the sea bottom. The study was carried out on two contiguous areas (labelled ZONE 1 and ZONE 2) of the continental shelf off the southern coast of Sicily, characterised by different dominant texture, ‘sand’ for ZONE 1 and ‘clayey-silt’ for ZONE 2. Simultaneous information on small pelagic fish schools and the seabed was obtained using a quantitative echo-sounder (SIMRAD EK500) that measures echoes due to the scattering from both fish schools and the…

geographygeography.geographical_feature_categoryacoustic surveySicily ChannelEcologyContinental shelffish schoolFishingPelagic zoneseabedAquatic ScienceSubstrate (marine biology)Demersal zoneEcho soundingOceanographyacoustic surveys; bottom and fish backscattering; echo-sounder; fish school; seabed; Sicily Channel.bottom and fish backscatteringGranulometryecho-sounderEcology Evolution Behavior and SystematicsSeabedGeology
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Comparative study of initial stages of copper immersion deposition on bulk and porous silicon

2013

Initial stages of Cu immersion deposition in the presence of hydrofluoric acid on bulk and porous silicon were studied. Cu was found to deposit both on bulk and porous silicon as a layer of nanoparticles which grew according to the Volmer-Weber mechanism. It was revealed that at the initial stages of immersion deposition, Cu nanoparticles consisted of crystals with a maximum size of 10 nm and inherited the orientation of the original silicon substrate. Deposited Cu nanoparticles were found to be partially oxidized to Cu2O while CuO was not detected for all samples. In contrast to porous silicon, the crystal orientation of the original silicon substrate significantly affected the sizes, dens…

inorganic chemicalsMaterials scienceImmersion depositionSiliconNanochemistryNanoparticlechemistry.chemical_elementNanotechnologyPorous siliconcomplex mixtureschemistry.chemical_compoundHydrofluoric acidMaterials Science(all)Porous siliconnanotechnology nanotechnology and microengineering nanoscale science and technologyGeneral Materials ScienceNano ExpressNanocrystalline silicontechnology industry and agricultureCondensed Matter Physicsequipment and suppliesCopperstomatognathic diseasesElectron backscatter diffractionChemical engineeringchemistrycopper nanoparticles; electron backscatter diffraction; immersion deposition; nanotechnology nanotechnology and microengineering nanoscale science and technology; porous siliconCopper nanoparticlesElectron backscatter diffractionNanoscale Research Letters
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Intravascular Ultrasound-based Imaging Modalities for Tissue Characterisation

2014

Atherosclerosis is the leading cause of cardiovascular mortality and morbidity in the developed world. Intravascular ultrasound (IVUS) is a widely used imaging modality providing complementary diagnostic information to angiography regarding the vessel wall of the coronary arteries. IVUS has been used for assessment of ambiguous angiographic lesions, evaluation of new interventional devices and in atherosclerosis progression-regression trials. However, the standard gray-scale IVUS has limited value for the accurate identification of specific plaque components. This limitation has been partially over- come by introduction of new IVUS-based imaging methods such as: virtual histology IVUS, iMAP…

medicine.medical_specialtymedicine.diagnostic_testbusiness.industryTissue characterizationequipment and suppliesmedicine.disease_causeVulnerable plaqueImaging modalitiesCoronary arteriessurgical procedures operativemedicine.anatomical_structureAngiographyIntravascular ultrasoundcardiovascular systemmedicineCoronary Diagnosis & Imagingcardiovascular diseasesRadiologyCardiology and Cardiovascular MedicineIntegrated backscatterbusinessCardiovascular mortalityInterventional Cardiology Review
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