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Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>
The development of robotics continues to open up new prospects for us in the field of automation and control of various objects. Recently, Finnish scientists presented an innovative approach to controlling humanoid robots using air currents. This method promises to revolutionize the way objects are manipulated and open new horizons in the field of robotics. The idea of controlling objects using air currents is not new, but until recently, implementing such concepts remained a challenge. Finnish researchers have developed an innovative method that allows robots to manipulate objects using special air jets as "air fingers". The air flow control algorithm, developed by a team of specialists, is based on a thorough study of the movement of objects in the air flow. The air jet control system, carried out using special motors, allows you to direct objects without resorting to physical ... >>
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Nanoscale FM radio station
02.12.2013
A group of physicists and engineers from the United States and the Republic of Korea has created a nanoscale device for frequency modulation of signals with a frequency of about 100 MHz. This corresponds to the FM band. It was possible to achieve a sharp reduction in the dimensions of the device by replacing the quartz crystal with a graphene sheet.
The authors of the new development point out that quartz resonators traditionally used to generate signals with a frequency of about 100 MHz take up a lot of space and it is basically impossible to reduce their size. The principle of operation of a quartz oscillator is based on the mechanical oscillations of a crystal, and the frequency of such oscillations depends on the size: if the crystal is made smaller, its frequency will increase above the desired value.
The new device uses a graphene sheet about a micrometer in size. It is the basis of the oscillatory system, which provides the generation of a signal of a given (carrier) frequency. Under the action of another, modulating, signal (for example, sound), the frequency of the carrier oscillations changes in proportion to the applied voltage, and due to this, a signal is transmitted at a frequency much higher than the original one. The scientists demonstrated the operability of the circuit at room temperature, and also showed the possibility of modulating a graphene oscillatory circuit with an audio frequency signal.
Currently, graphene is attracting the attention of many research groups around the world. In early November, for example, engineers from the Gwangju University of Technology in Korea unveiled a graphene-based ionistor that is almost as good as lithium-ion batteries. The main obstacle to the widespread introduction of a new material is the lack of a proven technology for obtaining it in a sufficiently pure form.
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