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A safe and inexpensive way to launch small satellites

21.07.2019

The search for low cost solutions to propel CubeSats is one of the most important components of the rapidly growing commercial satellite launch industry. The small size and relatively low cost have made CubeSats a popular choice for commercial launches in recent years.

The first CubeSat was launched in 1999. Since then, over 1000 have been sent into space. The rapid development and application of nanosatellite technology has greatly increased the complexity of the mission - sparking interest in reliable, low power and highly specific pulsed micropulse systems.

Purdue University researchers have created a novel micropulsation system for nanosatellite applications using a pulsed, liquid-fed plasma engine. It uses liquid propellant for a plasma accelerator with a pulsed Lorentz force and an extended life ignition system driven by nanosecond long pulses.

"Our innovations help address current challenges with CubeSat micropulsation systems, including short lifespan, contamination risks and economic challenges," said Alexei Shashurin, assistant professor of aeronautics and astronautics at Purdue Technical College. "Our system is capable of operating reliably throughout the mission, and The liquid fuels we use do not pose the pollution risk to subsystems that we see with current options."

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Signal transmission through human tissue 13.04.2020

A team of developers from Finland has demonstrated the operation of a method of signal transmission to implants placed inside biological tissue that is safe for living organisms. The signal cannot be intercepted, blocked or changed from a long distance.

Professor Marcos Katz of the University of Oulu has led research for many years to find alternative ways to communicate. In 2017, together with colleagues, the scientist developed a hybrid communication channel that can smoothly switch between the transmission modes of radio waves and waves in visible light using VLC (Visible Light Communication) technology. The channel operation mode depended on its state and transmitted information.

When testing, the radiation wavelength was increased from a few millimeters to several centimeters and found a good connection even for deeply located implants. The external signal source was located at a distance of several meters from the "body".

The first results - 10 kilobits per second - did not please scientists too much. Then she increased the number of receivers / signal sources, conjured over modulation schemes and received a multiple increase in the transmission rate.

The technology of transmitting a signal using infrared radiation is useful not only in communication applications. The VLC can be used to control, for example, pacemakers and defibrillators. At the same time, radio interference or someone's malicious intent will not be able to cause the failure of this vital equipment.

It is with the use of technology in the medical field that the future research of the Finnish team is connected. The developers hope to contribute to the development of methods for diagnosing and treating diseases, as well as controlling devices implanted in the human body. It remains only to better understand the biological tissue as a conducting medium for infrared radiation.

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