Orientation in the steppe. Tourist tips

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Orientation in the steppe. Tourist tips

Tourist tips

In cloudy weather, when it is impossible to determine the position of the sun and stars in the sky, orientation in the steppe very difficult. For short-term maintenance of the direction of movement, you can orient yourself relative to the direction of the wind.

Determining the cardinal points is possible by the orientation of the leaves of wild lettuce.

In winter and spring, in ravines, hollows, pits, the snow thaws faster on the north side, because direct rays of the sun do not fall on the southern edges of the depressions.

Orientation is possible along the traces of human activity, in particular, according to places of worship. As well as traces of flocks of sheep and caravan routes. Traces of cars should not be especially trusted, because. the lack of roads and traffic police encourages drivers to ride in any direction on business and without business, and the trail you choose can lead you nowhere.

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High-speed remote radar-metal detector 09.04.2013

An engineer from the University of Michigan, Kamal Sarabandi, proposed using a radar emitting polarized radio waves to search for weapons on the body of potential criminals. The operation of the Sarabandi radar is based on the fact that radio emission changes its polarization when reflected from metal objects. By measuring the degree of change in polarization, it can be determined whether a person is carrying a weapon or not.

Like a classic police radar, the device irradiates a moving object (in this case, the person being examined), and then records the signal reflected by it. First, as in the case of cars, the device determines the speed of a person due to the Doppler effect, which helps to separate his signal from the signals of other objects. The data obtained is then subjected to more complex computer processing designed to distinguish the reflection of radio emission from the torso and other parts of the body. Sarabandi developed the method of such processing during experiments with dummies in a special isolated chamber.

After computer processing of the signal, the device gives the degree of change in polarization, which makes it possible to judge the presence of metal objects on the human body. Scanning one "suspect" takes no more than a second, while a person can be at a distance of several hundred meters from the device.

According to the author of the invention, it was originally intended for the military. However, after reports of shootings at the American Sandy Hook School, Sarabandi came to the conclusion that such a radar could also help track the carrying of weapons in crowded places. In this case, it is not necessary to pass through the frames of metal detectors, the installation of which is not always convenient.

Another way to remotely search for weapons on the body is to use the so-called T-beams, electromagnetic waves in the terahertz range. In this range, most textile fabrics are transparent, allowing you to see weapons hidden under clothing.

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