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Study of the growth,reproductive biology and abundance for invasive shrimps Palaemon elegans Rathke from Garmat ali river Basrah,Southern Iraq

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Journal of Coastal Life Medicine 2016年第7期4卷 536-540页

作者： Khaled Khasaf al-Khafaji imad hadi al qarooni Murtatha Youssef al Abbad Nada Moffed Abd al-Lateef Marine Biology Department Marine Science CentreUniversity of BasrahBasrahIraq Biology Department Education College for Pure SciencesUniversity of BasrahBasrahIraq

Objective:To describe the growth,reproductive biology and abundance of the population of invasive shrimps Palaemon elegans(***)in one of the branches of Garmat ali river at Basrah,Southern ***:Monthly samples of the prawn *** were collected with a bottom hand net(40 cm,0.5 mm mesh)hauled over a distance of 10 m.A simple random sampling was conducted monthly between December 2012 and November ***:Seasonal changes were observed in the composition of the population of the species during the study year with the highest abundance in 2013 and the lowest abundance for the males was reported in January and for the females occurred in *** showed a significant correlation with the abundance of shrimps at the sampling *** largest female measured 67.90 mm while the corresponding value for males was 61.31 *** proportion of ovigerous adults rose during spring season to peak on about July and ovigerous prawns were taken in all months of the *** sex ratio indicated a preponderance of females over males in all months in the study *** females produced around 36-1324 eggs and the incubation period lasted for 11-14 days at 17-29°***:The results of the present study indicate that this species has a wide distribution range,high density,and great reproduction *** study reveals the lack of researches on this species in environments of Shatt al-Arab river and its ***,*** has most likely formed a permanent population in all the brackish waters in Basrah area.

关键词： Palaemon elegans Reproductive biology Density Population structure Sex ratio Fecundity

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Extracting Parameters of OFET Before and After Threshold Voltage Using Genetic algorithms

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International Journal of Automation and computing 2016年第4期13卷 382-391页

作者： imad Benacer Zohir Dibi Advanced Electronics Laboratory Department of Electronics University of Batna Avenue Chahid Boukhlouf Mohamed E1 Hadi Batna 05000 Algeria

This paper presents a compact analytical model for the organic field-effect transistors （OFETs）, which describes two main aspects, the first one is related to the behavior in above threshold regime, while the other corresponds to the below threshold regime. The total drain current in the OFET device is calculated as the sum of two components, with the inclusion of a smooth transition function in order to take into account both regions using a single expression. A genetic algorithm based approach （GA） is investigated as a parameter extraction tool in the case of the compact OFET model to find the parameters＇ values from experimental data such as： mobility enhancement factor % threshold voltage VTh, subthreshold swing S, channel length modulation A, and knee region sharpness m. The comparison of the developed current model with the experimental data shows a good agreement in terms of the transfer and the output characteristics. Therefore, the GA based approach can be considered as a competitive candidate compared to the direct method.

关键词： Organic field effect transistor (OFET) compact model parameter extraction genetic algorithm (GA) threshold regime.

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