Search results for "SAIL"

Global Sensitivity Analysis of Leaf-Canopy-Atmosphere RTMs: Implications for Biophysical Variables Retrieval from Top-of-Atmosphere Radiance Data.

2019

Knowledge of key variables driving the top of the atmosphere (TOA) radiance over a vegetated surface is an important step to derive biophysical variables from TOA radiance data, e.g., as observed by an optical satellite. Coupled leaf-canopy-atmosphere Radiative Transfer Models (RTMs) allow linking vegetation variables directly to the at-sensor TOA radiance measured. Global Sensitivity Analysis (GSA) of RTMs enables the computation of the total contribution of each input variable to the output variance. We determined the impacts of the leaf-canopy-atmosphere variables into TOA radiance using the GSA to gain insights into retrievable variables. The leaf and canopy RTM PROSAIL was coupled with…

Multitemporal and multiresolution leaf area index retrieval for operational local rice crop monitoring

2016

Abstract This paper presents an operational chain for high-resolution leaf area index (LAI) retrieval from multiresolution satellite data specifically developed for Mediterranean rice areas. The proposed methodology is based on the inversion of the PROSAIL radiative transfer model through the state-of-the-art nonlinear Gaussian process regression (GPR) method. Landsat and SPOT5 data were used for multitemporal LAI retrievals at high-resolution. LAI estimates were validated using time series of in situ LAI measurements collected during the rice season in Spain and Italy. Ground LAI data were collected with smartphones using PocketLAI, a specific phone application for LAI estimation. Temporal…

Sistema di supporto per vela alare semi-rigida

2013

La presente invenzione si riferisce ad un sistema di supporto per vela alare, in particolare per una vela alare semi-rigida a geometria variabile per uso nautico.

Quantifying the Robustness of Vegetation Indices through Global Sensitivity Analysis of Homogeneous and Forest Leaf-Canopy Radiative Transfer Models

2019

Vegetation indices (VIs) are widely used in optical remote sensing to estimate biophysical variables of vegetated surfaces. With the advent of spectroscopy technology, spectral bands can be combined in numerous ways to extract the desired information. This resulted in a plethora of proposed indices, designed for a diversity of applications and research purposes. However, it is not always clear whether they are sensitive to the variable of interest while at the same time, responding insensitive to confounding factors. Hence, to be able to quantify the robustness of VIs, a systematic evaluation is needed, thereby introducing a widest possible variety of biochemical and structural heterogeneit…

Numerical methods in the design process of a sailing yacht

2014

Défenseurs du roi : la garde de la cour de Versailles et sa réception à la cour de Dresde-Varsovie à la fin du xviie et dans la première moitié du XV…

2021

According to contemporary historiography, the earliest guard units formed in the fifteenth century, at the same time as mercenary armies. Similar units were created throughout Europe, on the French model. Once the French court was transferred to Versailles, it developed a grandiose ceremonial protocol, which shaped the final form of the royal guard. The latter’s tasks were primarily related to the protection of the king and the court, public buildings and important assemblies, as well as royal property and production centres, but also to the distribution of royal mail and broad official functions. In wartime, however, the guard served as elite military units, joining field troops. The model…

Reversing the Trend: a Psychosocial Intervention on Young Immigrants in Sicily

2018

Intervention projects based on providing support for immigrants can offer a number of benefits with regard to the social inclusion of young immigrants. Therefore, the actions suggested in this proposal may not only create a network between institutions and the private sector capable of supporting the intervention of a host country, but may also help to reduce the risk of crime as well as advocating a sense of otherness and integration. The approach to the project, a psychosocial intervention carried out on four young Africans who reached Sicily after crossing the Sicilian Channel on a dilapidated boat, has chiefly been to provide the four individuals with the chance to revisit their origina…

DACRON© 360 WOVEN: EXPERIMENTAL CHARACTERIZATION AND COMPUTATIONAL ASPECTS

2010

In this paper a first experimental study on Dacron© 360 woven constitutive behavior is presented. This woven is widely adopted in sail manufacturing, it is obtained by weaving polyethylene terephthalate (PET) yarn and it shows some peculiar features due to its own manufacturing process. The experimental tests, in terms of tensile tests and cyclic tests, clearly show the orthotropy features of the material, its high strength and deformability. The examination with optical microscope of the tested specimen allows to evidence the interaction between warp and weft yarns. The obtained results represent a first step for the definition of a correct computational approach to such materials.

Parametric Hull Design with Rational Bézier Curves and Estimation of Performances

2021

In this paper, a tool able to support the sailing yacht designer during the early stage of the design process has been developed. Cubic Rational Bézier curves have been selected to describe the main curves defining the hull of a sailing yacht. The adopted approach is based upon the definition of a set of parameters, say the length of waterline, the beam of the waterline, canoe body draft and some dimensionless coefficients according to the traditional way of the yacht designer. Some geometrical constraints imposed on the curves (e.g., continuity, endpoint angles, curvature) have been conceived aimed to avoid unreasonable shapes. These curves can be imported into any commercial Computer Aide…

Sailing dinghy hydrodynamic resistance by experimental and numerical assessments

2020

Abstract Hull forms of high-performance sailing dinghies are very interesting for yacht designers. After a long period in which the attention has been focused on one-design boats, in recent years a few exciting restricted classes such as International Moth, International 14′, 18’ Skiff and Class A catamaran become recognized in several countries and led to interesting advances in high-performance yacht design. “1001VELAcup R3” class is two people racing dinghy designed according to a box rule with limitation on LOA and Bmax and total sail area. The boats must be designed and built by students of European Universities and race yearly in Italy. This paper focuses on two best-ranked boats “LED…