s. a. fazelzadeh

Ascorbic Acid (AsA) is a water-soluble antioxidant that makes plants resistant to environmental stresses by neutralizing free radicals. However, it is unknown to what extent this antioxidant may help Improve Irrigation Water Use Efficiency (IWUE) and reduce the adverse effects of water deficit on mung bean growth and yield. In an attempt to clarify whether exogenous application of this antioxidant could alleviate the adverse effects of water deficit on mung bean plants, two seasons (2019 and 2020) of field experiments were conducted using twelve combinations of three AsA levels (distilled water as a control and 10 and 20 mM of AsA) and four irrigation water amounts (25, 50, 75, and 100% of the plant water requirement). Based on the results, the maximum IWUE was obtained with W50AsA20 in the two seasons. The beneficial effect of AsA application on IWUE was determined under water stress conditions (W50). High water deficit (W50) plus applying 20 mM ascorbic acid, i.e. W(50)AsA(20) treatment, improved seed yield about 43.7% as in the two seasons compared to high water deficit without ascorbic acid, i.e. W(50)AsA(0). In 2019 and 2020, water saving in W(50)AsA(20) compared to the control, was equal to 50% (2,550 and 2,500 m3 ha-1, respectively). In W(50)AsA(20) treatment, the increase of seed yield ranged between 79-107% in both seasons. Thus, the results reveal the potency of AsA to save water under low water supply and increase yield in mung bean fields.

The purpose of this paper is to simulate the vibrations caused by the aerodynamic force of the wind blowing. Disturbances of air currents over the cable cause the oscillations of the cable with certain amplitude. In this paper, the Dryden turbulence model is used to model wind-induced aerodynamic force. The equations of motion of the cable connected to the electromagnetic damper is obtained by using the Hamilton principle and then they are discretized to a set of linear ordinary differential equations by adopting the Galerkin method. In the following, the transfer functions of the first vibration mode of the cable are obtained and the bode diagrams for these transfer functions are plotted using MATLAB software. Then the effects of random gust parameters, such as length scale, turbulence intensity and wind speed on the frequency response of the cable are investigated. The results show that increasing length scale and wind speed decrease the resonant frequency of the system.