Ball wheelbarrow. Drawing, description

TOOLS AND MECHANISMS FOR AGRICULTURE
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Ball wheelbarrow. Drawing, description

Tools and mechanisms for agriculture

Directory / Tools and mechanisms for agriculture

The chores associated with the use of wheelbarrows are usually carried out with an eye on the weather. In the slush, after a bad weather, the wet heavy earth has to be covered with boards, otherwise the wheel will get stuck.

All these troubles can be avoided if you replace it with a ball of approximately the same diameter. It can be solid plastic or wood. With it, it is easier to control the wheelbarrow on turns.

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Rare earths from the ocean floor 12.09.2011

China, which provides 97% of the world's production of rare earth elements, has limited their export since 2010 to protect itself from competitors in the production of modern electronics. These metals are needed, for example, in the production of modern energy-saving lamps, mobile phones, computer displays.

In Japan and the US, a search has begun to replace neodymium in alloys for small but very powerful permanent magnets, which are widely used in electric vehicle engines. Looking for other options as well. According to Japanese geologists, who surveyed 78 areas of the Pacific Ocean floor under the guidance of Tokyo University Professor Yasuhiro Kato, in the bottom silt near the Hawaiian Islands and closer to the Antarctic, the concentrations of rare earth elements are approximately the same as in ores mined in China.

And, for example, dysprosium (it is also used in powerful magnets) in some places is twice as much. One square area with a side of 2,5 kilometers can provide all world demand for these metals for a year. True, the extraction of minerals from the ocean floor is still associated with environmental and economic problems.

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