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Bacteria will find explosives

14.11.2019

Mines hidden underground are a serious danger to both the military and civilians. Tens of thousands of people die from them every year. If the explosive does not work, decomposing it causes great harm to the environment.

The American defense research agency DARPA decided to solve the problem of finding mines in the soil. It was it that launched the program to create GM bacteria. Raytheon Corporation has taken on this challenge. In addition, microbiologists from the Worcester Polytechnic Institute are also involved in the project.

Scientists plan to create bacteria that will react to explosives with fluorescence. Raytheon announces the development of two strains. One will target greater depths with low oxygen content. The goal of the other is to complement it and respond to the signal. The latter will signal to people about the discovery of explosives.

Alison Taggart, one of the directors of the program, said that scientists are now working on the issue of "reprogramming" microorganisms into explosive detectors.

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Insect robots with ion-powered engines 01.02.2019

Nature has many interesting inventions that a person is not ashamed to copy and use in everyday life. Millions of years of evolution have created a miracle of everything that surrounds us. A person is trying to bring some of this experience into the world of robotic technology, for example, considering it valuable for creating flying insect robots. As a consequence, dragonfly robots or bee robots appear. However, the difficulty of scaling the flywheels and, as a result, the decrease in controllability makes it necessary to look for other non-natural sources of lift for miniature aircraft.

Scientists from the University of California at Berkeley have proposed using ion propulsion for insect-scale robots. The principle of operation of such ion engines is that positively charged ions (mainly nitrogen) rush from electrodes under a very high voltage to a lattice with an opposite charge. Along the way, the ions involve in the process neutral molecules from the air, which fly through the lattice and create thrust. Such engines are silent and capable of lifting a certain useful weight, but, unfortunately, require significant energy reserves.

A flying prototype of an ion-powered platform was created in the laboratory of the university. The dimensions of the sides of the robot are 2 cm and the weight of the structure is 30 mg. Another 36 mg weighs the power controller of the emitting electrodes. The voltage on the electrodes reaches 2000 V, although the current strength is only 3,5 mA. 7 wires are connected to the experimental platform, through which power and control are carried out. The principle of control is simple - one of the four arrays of electrodes is turned off in the required sequence, after which the tilt and movement in the desired direction occurs.

In the future, scientists plan to improve the platform to complete autonomy of control, with the exception of power. In the foreseeable future, none of them are waiting for the appearance of sufficiently powerful, capacious and miniature autonomous power supplies to be placed directly on the platform. But control can be given to the robot, for which it is planned to create a special controller and equip the robot with optical and other sensors.

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