The effect of finite electron temperature on the excitation of eigenmodes of a plasma loaded cylindrical waveguide is investigated. In the analysis, a nonlinear wave equation is derived using the linearized fluid equations along with Maxwell’s equations. The general result obtained for the annular plasma column is then reduced to be used for the case in which the plasma column fills the entire waveguide as well as for a partially filled configuration. Dispersion relations for electromagnetic and electrostatic modes are solved numerically to study the effect of electron thermal velocity on the characteristics of azimuthally symmetrical eigenmodes. The numerical studies show that the thermal motion of electrons shifts the frequencies of the perturbed transverse magnetic waveguide and those of cyclotron plasma modes toward higher values.

In spite of the importance of increasing water shortages in most pomegranate production regions, there is not sufficient information about the water requirement and crop coefficients (K c ) of pomegranate trees under various conditions (e.g., plant cultivar and age and irrigation system). The aim of this study was to measure evapotranspiration during three growing seasons (2013, 2015, and 2016) and to determine K c of young and mature pomegranate (Punica granatum L.) trees under drip irrigation in Iran. The soil water balance approach was applied to determine crop evapotranspiration (ET c ) using soil water content measured during the growing seasons. The ratio of measured ET c to reference evapotranspiration calculated according to the Penman-Monteith equation provided the K c values. According to the findings, from bud burst to peak season, daily K c values for young pomegranate trees ranged from 0.18 to 0.70, 0.22 to 0.89, and 0.23 to 0.95 in 2013, 2015, and 2016, respectively. For mature pomegranate trees, these values varied between 0.26 to 1.15, 0.21 to 1.25, and 0.30 to 1.08 in 2013, 2015, and 2016, respectively. From bud burst to peak season, the total ET c for young pomegranate trees was 711, 905, and 934 mm and for mature pome-

No abstract