Mazouz F, Belkacem S, Harbouche Y, Ouchen S, Abdessemed R. Fuzzy control of a wind system based on the DFIG. International Conference on Artificial Intelligence in Renewable Energetic Systems (IC-AIRES), Tipaza, Algeria, October 22-24International Conference on Artificial Intelligence in Renewable Energetic Systems (IC-AIRES), Tipaza, Algeria, October 22-24. 2017.
Mazouz F, Belkacem S, Ouchen S, Harbouche Y, Abdessemed R. Fuzzy control of a wind system based on the DFIG. International Conference in Artificial Intelligence in Renewable Energetic Systems. 2017 :173-181.
In this paper, the problem of time series prediction is studied. A Bayesian procedure based on Gaussian Process (GP) model combined with Linear Discriminate Analysis (LDA) as dimensionality reduction method is proposed. To evaluate the proposed approach, its performance is assessed using three scenarios: long window (latest 50 variables), short window (latest 5 variables) and persistence. To evaluate the performance of the proposed forecast model, the results of the different scenarios are compared to that of Extreme Learning Machines (ELM). Based on measured irradiance data from Tamanrasset, Algeria, the present results describe the performance of the combination of LDA with GP for forecasting hourly global solar irradiance.
Acacia karroo Hayne is the most important woody invader of grassland in South Africa, and is one of the fastest-growing acacias, and produces high density wood. This study aims to compare the germinative behaviour of A. karroo seeds collected from two ecotypes geographically and climatically different (Coastal and Steppic area) in salt stress. The seeds were exposed to saline stress conditions by increasing concentrations of sodium chloride (NaCl) varying from 0 to 50, 100, 150, 200, 250, 300, 400 and 600 mM. Germination was estimated by the daily rates and the final germinated seed rate during a period of 21 days in Petri dishes at 25˚C (5 replicates of 20 seeds). The emergence of seedlings was appreciated by their overall length. The results revealed the existence of a significant variation (p < 0.001) between the two seed
sources. Indeed, those collected from an arid ecotype were most tolerant at higher sodium chloride concentrations. The response to salinity stress varied in time with NaCl concentration and seeds origin which could be attributed to intraspecific variations resulting from the natural selection of the same species.
Under 400 mM of NaCl, 20% of germination was obtained from the coastal seeds against 66% from the steppic seeds. The repeated measures analysis of variance also revealed a significant effect of factors “Concentrations of NaCl, ecotypes, time of germination and their correlation” on the kinetics of germination.
A lot of forest species are abandoned because of difficulty with seed germination and establishment. A study was carried out to investigate the effects of wet scarification on seed germination of Acacia karroo and Gleditsia triacanthos, by considering germination percentage (GP), mean germination time (MGT) and germination rate index (GRI). Pre-sowing treatments included immersion in concentrated sulphuric acid for 30, 60 and 90 minutes, and immersion in hot water (100°C) for 5, 10 and 15 minutes. Soaking in distilled water (control) did not stimulate germination in either of the species. Treatments significantly (P < 0.001) affected GP, MGT and GRI in both species. Increasing the duration of soaking in sulphuric acid (from 30 to 90 minutes) improved the germination for G. triacanthos to 96%. High germination (99%) was attained for A. karroo seeds after soaking in sulphuric acid for 30 minutes.