We make ski wax. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
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We make ski wax. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

Melt 300 g of bituminous resin in a metal can, add 200 g of beef fat and 50 g of beeswax. Taking the vessel off the heat, add two large tablespoons of turpentine. Mix the mixture thoroughly and pour into cardboard boxes.

Lubricate warm skis with hardened ointment and then rub with a large cork.

Author: Shkurko D.I.

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Sensory networks made from spystones 03.11.2013

Lockheed Martin has demonstrated a new SPAN (Self-Powered Ad-hoc Network) surveillance technology. This is a hidden wireless autonomous sensor network that can provide long-term surveillance of the area. The network modules are parallelepipeds that fit in the palm of your hand, they are equipped with a radio antenna and, depending on the need, sensors: acoustic, magnetic, seismic, optical or others. The modules are so small that they can fit in a stone: an artificial piece of rock, a floor inside. From a distance of several steps, such a stone cannot be distinguished from natural, which makes it difficult to detect this tracking device.

A small sensor module equipped with wireless communication can be hidden in artificial stone, building wall and other objects and natural hiding places

The SPAN network is a self-organizing network of sensors that monitor a specific area of the surface. When one sensor-stone detects, for example, a vibration produced by an enemy tank, it sends a signal through a network of other sensor stones to an unmanned aerial vehicle, which immediately directs the lenses of a video camera and thermal imager, radar or other devices to the area where the threat was noticed. Thus, an immediate response to a threat is achieved, in addition, the need for UAVs and operators monitoring multiple monitors is reduced. The SPAN network uses algorithms to reduce false positives and operates autonomously without the need for maintenance and continuous management.

"Seeding" certain areas of the theater of operations, according to representatives of Lockheed Martin, will require minimal costs. At the same time, "smart" stones will be able to work autonomously for many years, thanks to power from solar panels and perfect energy-efficient technologies. In addition, the very fact of the existence and use of sensor stones is a powerful psychological factor affecting the enemy. Today, UAVs are an example of such a demoralizing factor that reduces the ability to resist.

Networked stones can be used not only by the military, but also, for example, when protecting pipelines, nuclear power plants and other critical infrastructure facilities.

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