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Ancient teeth from Peru hint that now-extinct monkeys crossed the Atlantic from Africa（图）
Ancient teeth Peru now-extinct monkeys crossed Atlantic Africa
2020/4/17
Four fossilized monkey teeth discovered deep in the Peruvian Amazon provide new evidence that more than one group of ancient primates journeyed across the Atlantic Ocean from Africa, according to work...
Damage Assessment of Historic Earthen Sites after the 2007 Earthquake in Peru
Damage Assessment Earthen Architecture Earthquake Seismic Damage
2011/12/21
The Pisco earthquake of August 15, 2007 resulted in 519 deaths and 1366 injured, with a total of 650,000 people affected and 80,000 dwellings damaged. Preliminary reports indicated that significant ea...
Opals: characterization, nomenclature definition and proposal of a new varieties classification following the discovery of new materials in Peru
nomenclature definition new materials Peru varieties classification
2011/11/8
This work has been carried out on a vast amount of samples (more than 500). In this summary I will concentrate on some of the analytical methods used on the characterization of 25 out of the Andean co...
Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru
opal optical absorption nanostructure Raman palygorskite TEM
2011/11/11
Translucent pink opals from Mexico (states of Mapimi and Michoacan) and Peru (Acari area, near Arequipa) are opal-
CT, containing from 10 to 40 % palygorskite, as demonstrated by XRD, infrared absorp...