Time transcendence, metadata and future utilization in 3D models of point clouds for heritage elements

Contributed to: Virtual Retrospect 2007 (Pessac, France, Nov 14-16, 2007)

Estimating reflectivity values from wind turbines for analyzing the potential impact on weather radar services

Locate full-text(opens in a new window)|View at Publisher| Export | Download | More... Atmospheric Measurement Techniques Volume 8, Issue 5, 27 May 2015, Pages 2183-2193 Estimating reflectivity values from wind turbines for analyzing the potential impact on weather radar services (Article) Angulo, I.a, Grande, O.a, Jenn, D.b, Guerra, D.a, De La Vega, D.a a University of the Basque Country (UPV/EHU), Bilbao, Spain b Naval Postgraduate School, Monterey, United States View references (28) Abstract The World Meteorological Organization (WMO) has repeatedly expressed concern over the increasing number of impact cases of wind turbine farms on weather radars. Current signal processing techniques to mitigate wind turbine clutter (WTC) are scarce, so the most practical approach to this issue is the assessment of the potential interference from a wind farm before it is installed. To do so, and in order to obtain a WTC reflectivity model, it is crucial to estimate the radar cross section (RCS) of the wind turbines to be built, which represents the power percentage of the radar signal that is backscattered to the radar receiver.

For the proposed model, a representative scenario has been chosen in which both the weather radar and the wind farm are placed on clear areas; i.e., wind turbines are supposed to be illuminated only by the lowest elevation angles of the radar beam.

This paper first characterizes the RCS of wind turbines in the weather radar frequency bands by means of computer simulations based on the physical optics theory and then proposes a simplified model to estimate wind turbine RCS values. This model is of great help in the evaluation of the potential impact of a certain wind farm on the weather radar operation.

Harreman-estilo berri bat enpresa familiarrekin

[EU]Lan honen helburua, ikuspuntu teoriko eta praktiko batetik ner group erakundea eta enpresa familiarra aztertzea da, erakunde honen enpresa familiarretan eta enpresa familiarrak ner groupen daukan eragina zein den ezagutzeko. Honetarako, harreman estilo berria aztertu ondoren, ner groupeko arduradunari elkarrizketa bat egin eta erakundeko bi enpresa familiar aukeratu ondoren, hauei ere elkarrizketak egin dizkiet biak hurbilagotik ezagutzeko, alderatzeko eta aztertzeko. Honela, enpresa familiarretan harreman estilo berria aplikagarria dela frogatu da baina enpresa familiar bakoitzak dituen baldintzak funtsezkoak izango dira estiloaren ezartzean. Era berean, enpresa familiarrentzat ner group erakundean barneratzea abantaila suposatzen diela aztertu da.