The study of the reproduction of the Glossy Ibis （Plegadisfalcinellus） in Tunisia was undertaken from 2008 to 2010. Until the discovery of nesting in 2008, this species had only been considered as wintering in Tunis...The study of the reproduction of the Glossy Ibis （Plegadisfalcinellus） in Tunisia was undertaken from 2008 to 2010. Until the discovery of nesting in 2008, this species had only been considered as wintering in Tunisia. The Tunisian breeding population resides in the Lebna Dam in the north east of the country where it forms a mixed nesting colony with other species of the family Ardeidae （（Bubulcus ibis （Bi）： 388 pairs, Ardeola ralloides （Ar）： 17 pairs, Egretta garzetta （Eg）： 27 pairs）, （Bi： 300 pairs, At： 25 pairs, Eg： 40 pairs） and （Bi： 400 pairs, Ar： 30 pairs, Eg： 10 pairs） recorded in 2008, 2009 and 2010 respectively）. All nests were constructed on Acacia horrida. Laying began in early May. The average clutch size over the three years of the study was 3.44 ± 0.73 eggs （N = 29 nests）. Hatching success was 83 % （2.86 ± 1.18 eggs hatched/nest） and 2.65 ± 1.17 hatchlings/nest survived until the age of 10 to 12 days. Egg mortality was 17% during the incubation phase and chick mortality was 7.2%. No interannual variation was detected in these parameters.展开更多
In this work, the authors propose the study of a wind speed variable based on the DFAM （double fed asynchronous machine）. The model of the turbine is drawn from the classical equations describing the operation of a ...In this work, the authors propose the study of a wind speed variable based on the DFAM （double fed asynchronous machine）. The model of the turbine is drawn from the classical equations describing the operation of a variable wind speed. The torque generated by the turbine is applied to the DFAM directly connected on the network side and the stator via a bidirectional converter side rotor. This configuration allows velocity variations of ±30% around the synchronous speed and the converter is then sized to one third of the rated power of the machine. The DFAM is controlled by a control vector ensuring operation of the wind turbine power coefficient maximum.展开更多
文摘The study of the reproduction of the Glossy Ibis （Plegadisfalcinellus） in Tunisia was undertaken from 2008 to 2010. Until the discovery of nesting in 2008, this species had only been considered as wintering in Tunisia. The Tunisian breeding population resides in the Lebna Dam in the north east of the country where it forms a mixed nesting colony with other species of the family Ardeidae （（Bubulcus ibis （Bi）： 388 pairs, Ardeola ralloides （Ar）： 17 pairs, Egretta garzetta （Eg）： 27 pairs）, （Bi： 300 pairs, At： 25 pairs, Eg： 40 pairs） and （Bi： 400 pairs, Ar： 30 pairs, Eg： 10 pairs） recorded in 2008, 2009 and 2010 respectively）. All nests were constructed on Acacia horrida. Laying began in early May. The average clutch size over the three years of the study was 3.44 ± 0.73 eggs （N = 29 nests）. Hatching success was 83 % （2.86 ± 1.18 eggs hatched/nest） and 2.65 ± 1.17 hatchlings/nest survived until the age of 10 to 12 days. Egg mortality was 17% during the incubation phase and chick mortality was 7.2%. No interannual variation was detected in these parameters.
文摘In this work, the authors propose the study of a wind speed variable based on the DFAM （double fed asynchronous machine）. The model of the turbine is drawn from the classical equations describing the operation of a variable wind speed. The torque generated by the turbine is applied to the DFAM directly connected on the network side and the stator via a bidirectional converter side rotor. This configuration allows velocity variations of ±30% around the synchronous speed and the converter is then sized to one third of the rated power of the machine. The DFAM is controlled by a control vector ensuring operation of the wind turbine power coefficient maximum.
