This study presents a combined pneumatic seed-metering device (SMD) that could not only fill, carry, and meter seeds, but also switch quickly between seed-metering and seed-cleaning modes, and clean seeds thoroughly and rapidly. The seed-filling, seed-carrying, and seed-metering modes of the SMD were analyzed based on a theoretical kinematic model. Furthermore, a three-factor, three-level ortho...

This paper described the design and implementation of a prototype transmitter and a prototype demodulator/decoder for space-time coded SOQPSK-TG for aeronautical telemetry. The design exercise showed that the space-time coding concept can be reduced to hardware. The laboratory bit error rate tests showed that the performance of the prototype demodulator in a 2-transmit/1-receive antenna configu...

background: ritalin is an amphetamine that possible to abuse, especially among college students. this study performed with aim to determine the attitudes, subjective norms, prototype, willingness and behavioral intentions regarding ritalin abuse among college students. methods: this cross-sectional study was conducted among 264 college students of isfahan university of medical sciences, during ...

In this chapter, a prototype small photothermal deflection apparatus was constructed on a laboratory bench. Not including excitation laser, data collection computer, and gas pumps, the apparatus fits on a bench space with a footprint of about 10 cm x 10 cm. This is a prototype apparatus that will be miniaturized in future assemblies. The apparatus was tested relative to the conventional laborat...