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Desenvolvimento de uma centrífuga de alta rotação eletronicamente monitorada para pesquisa em biologia espacial

机译:开发用于空间生物学研究的电子监控高速离心机

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摘要

This work presents the development of an centrifuge prototype for experiments with vegetables. Its main features are the high mechanical performance and instruments. In more details are presented the specification, implementation, validation and performance assessment through a case study. Its high speed and stability generates a vector component of centrifugal force, simulating conditions of hypergravity up to 15 times greater than the acceleration force on Earth. Plants subjected to the force have their metabolism modified. The system allows the study and monitoring of those growth patterns, showing how the samples are influenced by that stimulus induced on plants. The developed device has three levels of trays connected to a central axis, allowing the placement of 36 samples of containers simultaneously. Systems for remote monitoring of temperature, humidity and acceleration were developed and installed, ensuring uniformity of data. The transmission of these data was performed by radiofrequency. In addition, two independent systems of recording and transmission of images through VHF waves were created to determine the exact time of the plant growth stages (such as onset time of seeds and cotyledons formation). Once these components have been installed in the upper tray of the centrifuge, and were subjected to rotational movement, its power supply was provided through an external electrical source. In order to ensure the transmission of electric current between the static and dynamic part, it was employed a rotating two-pole connector. It was also developed a plate voltage regulator to deliver the correct voltage to each component. Finally, it was performed some performance tests and a comparative case study.
机译:这项工作介绍了用于蔬菜实验的离心机原型的开发。它的主要特征是高机械性能和仪器。通过案例研究更详细地介绍了规范,实施,验证和性能评估。它的高速度和稳定性产生了离心力的矢量分量,可模拟超重力条件,该条件比地球上的加速度大15倍。受力的植物的新陈代谢发生了变化。该系统可以研究和监测那些生长模式,显示出样品是如何受到植物诱导的刺激的影响。开发的设备具有连接到中心轴的三层托盘,可以同时放置36个样品容器。开发并安装了用于温度,湿度和加速度的远程监控系统,以确保数据的一致性。这些数据的传输是通过射频进行的。另外,创建了两个独立的通过VHF波记录和传输图像的系统,以确定植物生长阶段的确切时间(例如种子的开始时间和子叶的形成)。将这些组件安装到离心机的上托盘中并进行旋转运动后,即可通过外部电源为其供电。为了确保电流在静态和动态部分之间的传输,它采用了旋转的两极连接器。还开发了一种板式稳压器,以向每个组件提供正确的电压。最后,它进行了一些性能测试和一个比较案例研究。

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  • 作者单位
  • 年度 2012
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  • 原文格式 PDF
  • 正文语种 Português
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