9762 papers found
This study addresses preliminary results about the seasonal wind variability, especially during the winter season, in South Italy. Wind climate for the coastal waters off South Italy was estimated based on images of the Advanced Synthetic Aperture Radar (ASAR) onboard the ENVISAT satellite during the period from March 2002 to April 2012.
A parallel study, between wind profiles until 300m measured in experimental sites at Tyrrhenian Sea and at Black Sea we realize in order to investigate how the variation of wind flow influences meteorological parameter on coastal sites. The data set available made possible a key study of the influence of different wind regimes in the two sites. In particular it was possible to select days with different wind regime: one with well-developed breeze regime, one with not well developed breeze regime and the last one with uncompleted sea breeze. The stability classification in the three days was...
In this work we define a methodology within the context of the Calabria Region, in the port of Crotone, and we define for it a model for the integrated management of energy from renewable energy sources, such as solar and wind. Satellite data can provide information to determine solar and wind energy production potential cheaper than usual observational activity to identify and assess suitable areas. Here, we present a case study for both energy resources assessment from satellite in harbours.
In this paper the authors describe the structure of a wireless sensor node designed to measure height variations in coastal sand dunes. The paper focuses on the project and development of a sensing device able to measure the changes of height of sand dunes, based on an array of photoresistors (LDRs), designed to withstand the critical atmospheric conditions of coastal environments. Together with the sensing device, also a power control logic has been studied and developed, to reduce the power consumption leading to an ideal life time of the node of around two years. The sensor node is also...
The effective protection of the coastal ecosystem requires a detailed knowledge of the morphological evolution of the coastal environment. Several probabilistic models have been developed in the last decades to implement a reliable statistical forecasting of coastline dynamics. In this work, the non-linear Evolutionary Polynomial Regression (EPR) model has been used for the first time to evaluate the short-term dynamics of the shoreline from a set of measured shoreline positions in previous years. A comparison of the mean known shoreline positions with those predicted by the model, together...
Water pollution is a serious problem affecting rivers, seas, oceans and natural water resources. Pollution can be caused by human activities or as undesired consequence of an incident or natural disaster. The prediction of the propagation direction of contamination could support the decontamination activities in order to be more effective. By considering the disastrous effects on fauna and flora, attention is paid on oily contaminants, such as petroleum and oils, in sea and ocean. Such contaminants can be even not-visible at naked eye. In this paper, the authors describe a revised model to...
Traceable dynamic pressure measurement is the primary problem faced by dynamic pressure metrology. Various traceable dynamic pressure measurement methods are described and analyzed, which include inertia force, hydrostatic pressure, shock wave theory, laser-piston, refractive index, spectroscopy and so on. Based on the characteristics of various methods and the practices of dynamic pressure calibration researches in CIMM, they are grouped into three categories, which are macro definition of pressure, fluid state equation and fluid physical properties. The latter two are related to the...
This report describes the results of a pneumatic pressure standards key comparison among nine SIM National Metrology Institutes in order to determine their degree of equivalence in the pressure range from 10 kPa to 120 kPa in gauge mode. The pilot laboratory was the Centro Nacional de Metrología (CENAM, Mexico). All participating institutes used pneumatic pressure balances as their pressure standard. The transfer standard was a complete system including a pressure balance with a free-deformational piston- cylinder assembly and a set of masses. Eleven participants completed their...
This report describes the results of a pneumatic pressure standards key comparison among eleven SIM National Metrology Institutes in order to determine their degree of equivalence in the pressure range from 0.6 MPa to 7 MPa in gauge mode. The pilot laboratory was the Centro Nacional de Metrología (CENAM, Mexico). All participating institutes used pneumatic pressure balances as their pressure standard. The transfer standard was a complete system including a pressure balance with a free-deformational piston- cylinder assembly and a set of masses. Eleven participants completed their...
Fluke Calibration is accredited for gas flow measurements in the range of 0.1 sccm to 6000 slm in nitrogen and air. Traceability is maintained directly through a gravimetric flow standard but only recently from 1 to 10 sccm. The traceability of flow in the range of 0.1 to 1 sccm is based on extrapolation of the use of laminar flow elements below 1 sccm. This part of the range has never been completely verified through interlaboratory comparisons, proficiency testing or other means of measurement assurance. In an internal document from DH Instruments in the early 1990s it was suggested that a...