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Mexico and central america

Tula, the capital city of the Toltecs, was violently destroyed in the middle of this century. Although it has not been completely excavated the indications are that it was a large city with all the principal features of Toltec art and architecture.

A new Indian civilization appears to have been in an active growth phase at this time in Aztlan

Aztlan is the source of the word "Aztec" and means "people of heron place".
. No one is sure of the precise location of Aztlan, although Professor Sigberto Jimenez Morena suggests that it was an island village on the San Pedro River delta, some 450 miles northwest of present Mexico City, now called Mexcallitan. This has been called the Venice of Mexico because in rainy seasons the streets flood and the people move about by canoe. The adjacent Mangrove swamps have thousands of herons, including at least 15 different species. The Aztec legends say that their small tribe moved from Aztlan into the area of Tula, once the capital of the great Toltec Empire, and there they picked up what they could of the Toltec civilization from its descendants. Toynbee (Ref. 220 ) calls this nascent Aztec Society the "Mexic" and in this 12th century it consisted of various small states, with Chichimec people forming petty kingdoms along the Valley of Mexico. One site was Tenayuca. (Ref. 138 , 220 , 146 , 88 )

South america

The greatest activity of the 12th century in South America continued to be in the region of northern Peru and what is now Ecuador. By mid-century the Chimus, in their great kingdom of Chimor, had revived the old Moche Kingdom, in a political and geographic sense. They were great builders and extended the old Moche irrigation and road systems. Their black pottery, however, was in contrast to the vigorous polychromatic Mochica pieces. Gold was apparently plentiful and was used chiefly in the pure state, although sometimes alloyed with silver or copper. Fantastic, intricate and delicate golden objects of the Chimu were found in 1937 in the area of Lambayeque, Peru, near the Ecuador border. The population of the nation may have been 250,000 and Chan Chan, the capital, covered 3 1/2 square miles. Ca jamarquilla and Pachacamac were additional large cities, each larger than Rome or Alexandria.

Five or six hundred miles south of the Chimu the Chincha Basin was also being rejuvenated on a large scale, with cultivated land extending over about 12 miles on the formerly sterile sea coast terraces. Some 37,000 acres of land of the Canete Basin were now utilized and this was accomplished by construction of lateral canals 24 to 36 miles long. The Ica and Nazca basins remained quiet. (Ref. 62 )

According to Inca myth it was in this century that Manco Capac and his sister-wife, Mana Ocllo, left the Island of the Sun in Lake Titicaca and went forth as son and daughter of the Sun God, Inti, to found the Inca Empire, "The Kingdom of Gold". (Ref. 10 )

The Diaguites remained in the Argentine Andes and, although dating in inconclusive, sometime in this approximate time-frame they practiced an advanced metallurgy, using copper ore pulverized on stone mortars and mixed with zinc, gold and silver. This was then melted in hearths, using the wind as bellows, and finally poured into molds. Gold was beaten into very thin sheets and used to decorate masks and jewelry by the reverse hammering technique. (Ref. 62 )

Forward to America: A.D. 1201 to 1300

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Some 300 farms had been established in Greenland by this century. (Ref. 301 )

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
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Kyle
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Adin
why?
Adin
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biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
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what does nano mean?
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nano basically means 10^(-9). nanometer is a unit to measure length.
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characteristics of micro business
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for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
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Source:  OpenStax, A comprehensive outline of world history. OpenStax CNX. Nov 30, 2009 Download for free at http://cnx.org/content/col10595/1.3
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