Nasrolah Astan; davood mohamadzamani; mohamad ghoamiparshokuhi; Ebrahim Ebrahimi
Abstract
The use of renewable energy is very important in meeting current and future needs. Vibrations are a good source of energy, especially through piezoelectric nanogenerators. Light, soft and flexible piezoelectric materials such as PVDF can be used to supply part of the electrical energy required by drones. ...
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The use of renewable energy is very important in meeting current and future needs. Vibrations are a good source of energy, especially through piezoelectric nanogenerators. Light, soft and flexible piezoelectric materials such as PVDF can be used to supply part of the electrical energy required by drones. This study was conducted to investigate the possibility of using PVDF / Zno-RGO piezoelectric polymer polymer nanofibers in supplying the required energy of different UAV components. In this study, first, polymer nanofibers were constructed through electrospinning process and then piezoelectric nanogenerator was constructed. Finally, the amount of electrical energy produced and its usability in multi-axis drones were evaluated. A plan was proposed to install a piezoelectric nanogenerator on the arm of a multi-axis drone. The highest output voltage in one of the samples of nanogenerators was 560 mV and in the larger sample was 1870 mV in laboratory conditions and at a frequency of 23 Hz for 5 minutes. The results of this study showed that by using piezoelectric nanogenerators, it is possible to supply part of the electrical energy used by drones and it can be upgraded.
hooshang ardikhani; mohamad ghoamiparshokuhi; davood mohamadzamani; mohammad ghahdarijani
Abstract
Given the vastness of the country's border area and the climatic diversity of the crop and garden various regions, it is an undeniable necessity to achieve a suitable cultivation pattern that can maximize the utilization of factors and institutions of production, especially the water-limiting factor. ...
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Given the vastness of the country's border area and the climatic diversity of the crop and garden various regions, it is an undeniable necessity to achieve a suitable cultivation pattern that can maximize the utilization of factors and institutions of production, especially the water-limiting factor. The main question in this study is that considering the current situation in horticulture in Qazvin province, what parameters emphasize the optimal conditions for determining the cultivation pattern and allocating inputs in different orchards. For this purpose, in this study, first, the relevant technical, environmental, social and economic indices and criteria that have been presented in various research sources were examined. Then, using multi-criteria decision making methods, a composite index of the mentioned indices was presented. In this study, a simple two-step random sampling method was used. In this research, in order to present a suitable pattern for cultivating horticultural products from the ideal planning method using Lingo 17 software was used. According to the results of the model, in the case of phosphate and potash fertilizers, the consumption reduction was observed to be 9.5% (above the ideal level), but in the case of nitrogen fertilizer, the consumption was reduced by 8%. In the case of the three ideals of reducing the consumption of herbicides, insecticides and fungicides, excessive success was observed, i.e. a decrease in consumption of 4.5, 5.7 and 8 percent, respectively. Due to the abundance of water resources in this area, in the case of 12 ideals related to water reduction, too much success was observed, i.e. a one percent decrease in water consumption per month. The results show that the application of ideal planning method in optimizing goals and allocation for each product provides more logical results than single-objective models.
