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Light signals of stars

14.01.2009

One method for detecting planets around distant stars is to observe the star to see if its light is periodically weakened. Temporary darkening may indicate the passage between the star and the Earth of a large planet.

French astronomer Luc Arnold suggests that other civilizations can signal their presence by creating a huge shield in space, from time to time obscuring the central star of their system from an outside observer.

The shield should not be round, but rectangular or triangular, so that the obscuration it creates can be distinguished from the passage of the planet. If the "damper" is made not solid, but trellis, the light of the star will flash, transmitting signals - for example, a natural series of numbers.

According to the calculations of the author of the idea, a highly developed civilization could intercept an asteroid made of iron, melt it by heating it with lasers up to 1500 degrees Celsius, and form a thin screen with a diameter of more than 10 thousand kilometers. Earth civilization will reach such power in a hundred or two hundred years.

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Thanks to the wide spread of a number of technologies, such as radio, television, cellular communications, Wi-Fi and Bluetooth, the entire space around us is literally permeated with radio waves. These radio signals provide the operation of one type of electronic devices, being interference for other types of devices. Because of this, the stability of wireless connections may suffer, the data transfer rate may decrease, and in some especially tragic cases, an electronic device may completely interrupt its operation due to strong interference.

To prevent the influence of electromagnetic interference on critical components of electronic equipment, engineers have long used the method of shielding protection. This method consists in the use of metallic, in most cases copper foil, which reflects unwanted radio signals in the opposite direction. This method works quite well, but the use of additional materials often adds a lot of unwanted weight and bulk to the electronic device.

In search of a new protective material, scientists from Drexel University stumbled upon titanium carbonitride, which belongs to a class of conditionally two-dimensional materials called MXene. Previously, materials of this class have already been used in the creation of conductive compositions, battery electrodes that provide fast charging, high-performance sprayed antennas, etc.

In this case, scientists have found that titanium carbonitride sheets, which are thinner than a human hair, block electromagnetic signals three to five times better than copper foil. At the same time, if the copper foil reflects signals, then the titanium carbonitride coating effectively absorbs them, reducing the average level of electromagnetic noise in the adjacent region of space.

Due to its high EMI absorbency and thinness, MXene film can be used to create individual screens for each component individually. This will also avoid unwanted mutual influence between components located in close proximity on the printed circuit board of the electronic device, which should positively affect the stability of the device, its reliability and efficiency in terms of the amount of energy it consumes.

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