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This paper presents a new method developed to significantly reduce the necessary time for the ageing tests for different types of photovoltaic cells. Two ageing factors have been applied to the photovoltaic cells: the concentrated light and the temperature. The maximum power of the photovoltaic cells was monitored during the ageing process. The electrical dc and ac parameters of the photovoltaic cells were measured and analyzed at 1 sun irradiance, before and after the test stress. During the test, two photovoltaic cells are kept at maximum power point and the other two are kept at open circuit voltage point. The method is validated through the results obtained for the monocrystalline silicon solar cell.

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In this paper is presented an architecture for a flexible mini robot for a multiagent robotic system. In a multiagent system the value of an individual agent is negligible since the goal of the system is essential. Thus, the agents (robots) need to be small, low cost and cooperative. RoboSmith are designed based on these conditions. The proposed architecture divide a robot into functional modules such as locomotion, control, sensors, communication, and actuation. Any mobile robot can be constructed by combining these functional modules for a specific application. An embedded software with dynamic task uploading and multi-tasking abilities is developed in order to create better interface between robots and the command center and among the robots. The dynamic task uploading allows the robots change their behaviors in runtime. The flexibility of the robots is given by facts that the robots can work in multiagent system, as master-slave, or hybrid mode, can be equipped with different modules and possibly be used in other applications such as mobile sensor networks remote sensing, and plant monitoring

Meeting basic psychological needs could be difficult to maintain in current pandemic times, mainly due to preventive measures involving social distancing or full quarantine, which seem to play a very important role in well-being. The theory of basic psychological needs is a sub-theory of human motivation theory known as the theory of self-determination. This theory argues that meeting the needs of autonomy, relatedness and competence is crucial for motivation, optimal development, efficient functioning and health. Several research, examining the effects of basic psychological needs on well-being, concluded that changes in meeting the three needs had a significant effect on well-being. Because perceived stress plays a vital role in daily life, several coping strategies have been shown to effectively manage stress and reduce its negative consequences. In this study, coping mechanisms refer to both cognitive and behavioral efforts to alleviate or overcome stressful situations, especially when an automatic response is not readily available. The present study aims to examine a predictive model of competence need satisfaction based on adaptive coping mechanisms: active coping and positive reframing, on a convenience sampling of 403 Romanian respondents. Results show that 3% of the variance in competence need satisfaction is explained by active coping and positive reframing. In this work, we have used Fuzzy logic modelling on our psychological data to deal with the imprecision and vagueness inherent in input data and build a more reliable model for estimating psychological variables relations. Implications and conclusions are discussed.