Suchergebnisse

The Gulf-Air incident that took place in 2000 in Manama, Bahrain supported the need for adopting innovative strategies to deal with the consequences of air disaster. Due to the nature of the incident, an ad-hoc team was formulated at the Cairo Airport and its major objective was to address the critical needs for the upkeep of the regular operations at the airport, as well as considering the cultural, religious and human needs of individuals, families and communities affected by the disaster. The ad-hoc emergency team was successful in applying immediate and flexible strategies that were effective in achieving the objectives of the emergency management plan. Contrary to the belief in the need to rely solely on the Command and Control Approach in disaster management, this study provides evidence of the effectiveness of emergency management strategies that are based on the Human Relations Approach.

Children who experience political violence and wars are vulnerable to different sorts of psychological reactions. Unfortunately, cultural constraints and the stigma attached to therapy may prevent these children from receiving needed treatment. This study presents a case of a child with PTSD where a single subject design was used to measure treatment outcomes. The design enabled the social worker to assess, monitor and measure the course of treatment. The advantages of applying the design in clinical intervention in other cultures are highlighted.

This paper presents an application of the genetic algorithm (GA) for optimizing controller gains of the Self-Excited Induction Generator (SEIG) driven by the Wind Energy Conversion Scheme (WECS). The proposed genetic algorithm is introduced to adapt the integral gains of the conventional controllers of the active and reactive control loop of the system under study, where GA calculates the optimum value for the gains of the variables based on the best dynamic performance and a domain search of the integral gains. The proposed genetic algorithm is used to regulate the terminal voltage or reactive power control, by adjusting the self excitation, and to control the mechanical input power or active power control by adapting the blade angle of WECS, in order to adjust the stator frequency. The GA is used for optimizing these gains, for an active and reactive power loop, by solving the related optimization problem. The simulation results show a better dynamic performance using the GA than using the conventional PI controller for active and reactive control.

Due to the changes that developing countries are currently facing, social work educators are forced to assess the curricula in order to help societies deal with new waves of social problems. This study explores a number of factors that contribute to the process of modernizing social work education in Egypt.

Abstract

Increasing ultraviolet (UV) radiation is causing oxidative stress that accounts for growth and yield losses in the present era of climate change. Plant hormones are useful tools for minimizing UV-induced oxidative stress in plants, but their putative roles in protecting tomato development under UVC remain unknown. Therefore, we investigated the underlying mechanism of pre-and post-kinetin (Kn) treatments on tomato plants under UVC stress. The best dose of Kn was screened in the preliminary experiments, and this dose was tested in further experiments. UVC significantly decreases growth traits, photosynthetic pigments, protein content, and primary metabolites (proteins, carbohydrates, amino acids) but increases oxidative stress biomarkers (lipid peroxidation, lipoxygenase activity, superoxide anion, hydroxyl radical, and hydrogen peroxide) and proline content. Treatment of pre-and post-kinetin spraying to tomato plants decreases UVC-induced oxidative stress by restoring the primary and secondary metabolites' (phenolic compounds, flavonoids, and anthocyanins) status and upregulating the antioxidant defense systems (non-enzymatic antioxidants as ascorbate, reduced glutathione, α-tocopherol as well as enzymatic antioxidants as superoxide dismutase, catalase, ascorbate peroxidase, glutathione peroxidase, glutathione-S-transferase, and phenylalanine ammonia-lyase). Thus, the application of Kn in optimum doses and through different modes can be used to alleviate UVC-induced negative impacts in tomato plants.
Graphical abstract