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Geplaatst: 13-06-2018 07:58:18 Reageren met citaat
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BEIJING John Stones England Jersey , Sept. 16 (Xinhua) -- Beijing on Saturday closed its largest small commodities market.


The Tianyi wholesale and retail market had been in operation for nearly 25 years and under pressure from e-commerce in recent years.


It had two outlets, with one near Di'anmen being closed in late 2015. The Fuchengmen market with a floor area of more than 40,000 square meters has now also been closed.


The two once had more than 3,000 vendors, offering 130,000 products.


Li Yunwei, an official with Xicheng district, home to the market, said authorities will attract high-end businesses Joe Hart England Jersey , including tech and financial firms, to fill the building.


Over the past few years, authorities in Beijing have closed wholesale markets and small polluting firms in a bid to upgrade economy, control the population and reduce pollution.


In the first eight months of the year, Beijing dismantled 25 markets, closed another 41, and shut down or relocated more than 3,100 low-end businesses.


China-US Ping-Pang diplomacy commemorated at headquarters of UN


Aftermath of typhoon Doksuri in central Vietnam


Highlights of Longines Equestrian Showjumping Grand Prix in Tianjin


Variety of activities of popularization of science held across China


Special snacks displayed during 14th China-ASEAN Expo


Scenery of paddy fields in Baicheng, NE China's Jilin


China Focus: World's oldest panda dies aged 37


Scenery of terraced fields at Wuyishan in SE China's Fujian

How about a little bet between us? Let s see if you know Jamie Vardy England Jersey , or otherwise can guess, what object played an essential role in the building of all four items in this short list:

your computer s Hard drive
your grandfather s wrist watch
Roman Emperor Caligula s Floating Palace
San Francisco s International Airport

A little difficult, isn t it? Most likely, it s the third item that threw you off, isn t it? Don t feel discouraged, though: we haven t been able to reply, either, when we heard the same question, accompanied by a little smirk James Milner England Jersey , during a conversation with our friends at TreErre. It must be said, though, that they were cheating: because the answer is the very object that Treerre deals in, that is, ball bearings.

Ball bearings really are one of those items for which it s tough to decide on a specific inventor, because, more or less like is the case for the wheel, it wasn t actually created at a specific point in time, but it was developed by successive improvements. Perhaps for this very reason Jack Wilshere England Jersey , we find traces of bearings in the carriages of Vandals and Goths, who lived as nomads in the North of Europe mor than two thousand years ago, and mounted systems of roller bearings on their carriages wheels. Romans themselves, as we saw, knew the principle behind bearings, and implemented it, for example, on Caligula s Floating Palac, one of the famous Nemi ships. And if the Middle Ages Jack Butland England Jersey , as in many other cases, saw this technologu, and its knowledge, vanish from application, it is in the Renaissance that we find famous Leonardo da Vinci (and how could it be any different, actually) once again deducing the funding principles of bearings and applying them to some of his projects.

The technology which is needed to mass produce a truly efficient ball bearing, though, isn t trivial at all. La tecnologia necessaria a produrre in serie un cuscinetto a sfera davvero efficace, tuttavia Harry Kane England Jersey , non ? banale. The smoothing of the metal spheres, and the required precision in assembly, proved a practically insurmountable obstacle to mass production for several centuries after the times of our Leonardo, actually until August 3rd 1869, when Jules Suriray, a bicycle mechanic from Paris, was granted a patent for a tue ball bearing system. It can be nice to note an immediate triumph: Suriray mounted the newly patented bearings on the bicycle which, three months later, Moore mounted to win the Paris Rouen Gary Cahill England Jersey , the first bicycle race in history. And it was finally in Sweden, forty years later, that Sven Wingquist, aged thirty, founder of SKF, the largest manufacturer of Ball Bearings in the world, patented the self aligning ball bearing which we still use today.

But that s enough history. Before we say bye, perhaps you d like to know something more about the real practical applications of this object which is so ancient and so modern at the same time. Are you still curious about how ball bearings could ever be linked to the construction of San Francisco s International Airport?

Well, the answer is quite particular indeed. As you probably know Fraser Forster England Jersey , the entire area where the city of San Francisco lies is at high seismic risk. For this reason, the entire airport was built to rest on 267 columns, whcih sustain its weight: and each of this column, in turn, rests, inside a concrete cell, on a large, five foot diameter ball bearing. Should there be an earthquake, this system allows the airport to ignore ground movements of up to twenty inches Eric Dier England Jersey , as the bearings insulate the columns from the tremors. Once danger is past, gravity itself realigns each column on its base.
One thing s for sure, ball bearings have come a long way since that Paris Rouen race in 1869...

Author's Resource Box

For ten years, Treerre has been dealing in the best that the market can offer in Ball Bearings, and designing applications for all the most complex and delicate cases. Meet them at http:www.treerresrl.it.

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