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Aluminum The Material of choice
Aluminum: Aluminium is a
soft and lightweight metal with a dull silver-gray appearance. Aluminium
is about one-third as dense as steel or copper is malleable
ductile, and easily machined and cast; and has excellent corrosion resistance and
durability due to the protective oxide layer. It is also nonmagnetic
and nonsparking and is the second most malleable metal (most being gold) and the
sixth most ductile.Whether measured in terms of quantity or value, the use of
aluminium exceeds that of any other metal except iron and it is important
in virtually all segments of the world economy.Aluminium alloys form vital
components of aircrafts and rockets as a result of their high strength
to weight ratio. Aluminium was selected as the
material to be used for the apex of the Washinton Monument, at a time when
one ounce cost twice the daily wages of a labourer.
Aluminium was, when it was first discovered, extremely difficult to separate
from the rocks it was part of. Since the whole of Earth's aluminium was bound up
in the form of compounds, it was the most difficult metal on earth to get,
despite the fact that it is one of the planet's most common. The reason is that
aluminium is oxidized very rapidly and that its oxide is an extremely stable
compound that, unlike rust on steel, does not flake off. The very reason for
which aluminium is used in many applications is why it is so hard to
produce.Recovery of this metal from scrap (via recycling) has become an important
component of the aluminium industry. Recycling involves simply melting the
metal, which is far less expensive than creating it from ore. Refining aluminium
requires enormous amounts of electricity; recycling it requires only 5% of the
energy to produce it. A common practice since the early 1900's, aluminium
recycling is not new. It was, however, a low-profile activity until the
late 1960's when the exploding popularity of aluminium beverage
can finally placed recycling into the public consciousness.
Electric power represents about 20 to 40% of the cost of producing aluminium,
depending on the location of the aluminium smelter. Smelters tend to be located
where electric power is plentiful and inexpensive, China is currently
(2004) the top world producer of aluminium.
After peaking in
popularity in the lavish homes of the 1920s then nearly disappearing from new
construction during the whimsical vinyl-sided cottage era, Wrought
Aluminum is making a phenomenal come back over wrought iron, now that Aluminum is cheaper to
produce and the new techniques available to make it
look like wrought iron with the benefit of maintenance free .
Designers and builders attribute the resurging demand to current
trends in architecture featuring Mediterranean, Southwestern, and French country
style homes. Also credited are improved production methods that render the metal
applications more durable
The topic of gating is increasing. The blur between the public space
and the private realm of the homeowners' association and its management is
surfacing. However, land developers are very aware that gating is assumed to
favor increased property values, and the town officials are aware of the
associated increases in the town's property tax base.
There are more than seven million households (about 6 percent of the
national total) behind fences or walls, according to the Census Bureau's 2001
American Housing Survey. The Census Bureau estimated the percentage of people
living in gated communities had shot up by 11 percent in the West. The homes
behind the walls, the survey revealed, were "upscale," and "mostly white
developments."
Built in the early 1930s, the first gated communities in Los Angeles
were upper-scale developments in Rolling Hills and Bradbury. Now, gated
communities represent almost 50 percent of the market in the desert resort areas
near Palm Springs.
"As real-estate commodities, they are tailored to fit
to specific prospective buyers. Gated communities are located within every kind
of middle class and upper-class neighborhoods, and are now available for every
market segment continuing to increase.
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