EXPERIMENTAL STUDY OF THE BEHAVIOUR OF SMALL WIND TURBINE DURING THE STARTING PERIOD

This research shows that the design of wind turbine blade for the best production of energy produces a turbine with a problem of start-up. The study focused on ways to improve the process of the small wind turbine start-up at the low wind speed with the stability of the pitch blade angle, and study the behavior of the turbine during the stage of angular acceleration after the start-up until the turbine reaches the speed of rotation that enable it to produce the energy.

Higher Harmonics and its effect on the stability of the Induction Machine’s work

This paper presents an important idea about the higher harmonics (both temporal and spatial) and the reason of their appearance and negative effects they cause on the electrical power consumers. Generated rotating torques from upper harmonics is then calculated, and their effect on the mechanical characteristics of the induction motor, and how to mitigate this effect depending on motor design. Higher harmonics produce additional electrical and magnetic losses in induction motors which increase the motor’s heat and decrease its energy yield and power coefficient. This research shows how to decrease these losses to improve the mechanical characteristics of the induction motor and enhance the performance.

Studying the cation distribution in the Co0.6Zn0.4 –ferrite using ESR

The ESR signal of the Co0.6Zn0.4Fe2O4 ferrite system was recorded at room temperature. The experimental magnetic moment value was estimated by means of integrated intensity of ESR signal and its maximum position. It has been used some theoretical relations were used to estimate the values of magnetic moment of the studied ferrite. The cation distributions between tetrahedral and octahedral sites were established from the values of magnetic moment.In addition, the lifetimeof energy level was determined.

Height and Feature Parameters Study of thermally evaporated ZnS thin films By AFM

AFM has been used to get microscopic information of the surface structure and to plot topographies representing the surface relief. AFM technique can be used to visualize the surface relief, specify the growth of thin films, and determine Height parameters.

General Formulation of the Definition Relations wth the Elastic Curve’s Unknowns for Beams

Through the last centuries Scientists and Researchers have created analytic and geographic multi-methods and formulas for the definition of elastic curve’s unknowns of beams. We have seen that most of these methods had matched in their end formulas, while they only differed by the analytic basis for the differentiating of these formulas, that their introductions depended on different physic expressions and mathematic relations. This scientific work contains a concise preview for the definition relations and methods of elastic Curve’s unknowns of beams available, so that the expression about these in an easy and collective expression with agreement of the depended analytic method by the Researcher. That can avail of the academic job on the first hand, and it helps the structural analyzer choose the proper and easier device for his structural analysis for the definition of elastic Curve’s unknowns of studied structural system.