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THE ROCK ART OF THE SERRA DA CAPIVARA

What I am doing with my life I am a business woman. Things I like about myself I am Independent most of the time, responsable, Strong and have a good sense of humor.


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My favourite outdoor activities are I love nature so anything related to it. My favourite indoor activities are A nice dinner at home, a good movie and a book. These topics are interesting for me Write something here. I might look for you if Write something here. You like each other! Add a photo. Figure 4 contains the dose response curves for the tooth enamel obtained by both laboratories. Each point represents the results of three measurements, and error bars are the standard deviation. The experimental data points were fitted by using the equation Ikeya :.

The equivalent dose D e was obtained by fitting the data with the Origin 8. This dose results from exposure of the sample to the environmental radiation in the past and is related to age. The data show that D e values obtained for the enamel and the shell in both laboratories agree well, attesting to the precision of the methodology. Ikeya et al. The concentrations of radioisotopes in the shell, dentine, and enamel are below the detection limits of the Neutron Activation Analysis technique, which are 0.

Table III lists the results for the components of dose rates and ages. In both cases, the internal dose rate is negligible because the concentration of radioisotopes in the samples is low. However, when this is not the case, the internal dose rate depends on the way in which the radioactive elements are incorporated by the sample. Some theoretical models for uranium uptake have been developed and implemented in a computational algorithm; for example, Early uptake, which provides the minimum age of the sample, and Linear Uptake LU Ikeya , which considers that uranium is absorbed at a constant rate.

The Recent Uptake RU model provides de maximum age and assumes that the uranium present in the tissues has been incorporated recently Blackwell and Schwarcz Fortunately, in the present case the age and isotope concentrations are such that these more sophisticated models are not necessary. Regarding the external dose rate, Figures 1 b and 1c show that the tooth was not connected to the mandible but it was loose in sediment. The same was true for the shell, and there was a cm layer of soil around them.

Therefore, there is no need to correct the dose rates due to the sediment. Another point to discuss is that both materials are close to the bone that may accumulate uranium, leading to increased dose rate. Although we did not assess the contents of radioisotopes in bone, the good agreement between the ages obtained by C and ESR for the shell leads to the conclusion that this variation in dose rate should lie within the precision of our measurements and go unnoticed. Furthermore, the concentration of radioisotopes in the shells, enamel, and dentin fall below the level of detection, so a similar pattern should emerge in bones.

These variations suggest that the bodies were placed on the sandstone block engraved with unrecognizable artwork at different times. DNA analyses are currently being performed to establish a hypothetical membership of family groups.

More recently, dating of feline coprolites near a skeleton from this site Sianto et al. The age found in this work agrees with findings in this region reported in other studies. The acidity of the soil precluded several attempts at C dating of the fossil bones found at this site and in the region around the site due to degradation of the organic part of the sample.

Dating of the shell is a good indicator of the age of the skeleton because this shell was in the same stratum, and its position indicated that it was associated with the burial.


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Therefore, ESR dating of the human tooth and the shell proved to be a very convenient and useful method. ESR dating is an environmental mediated dating technique and is prone to many interfering factors. However, in some cases it is the only possible way to date a fossil because there is not enough carbon available or the fossil is out of the range for C dating. Hydroxyapatite tooth and Calcite shell differ in terms of the spectral characteristics and sensitivity to radiation. The D e results found by both laboratories are similar, which adds reliability to the results. Therefore, this inter-comparison study is relevant and shows that the dating results obtained by the two laboratories and the radiocarbon technique are in good agreement.

The results of this study shall encourage the use of this technique to date other samples where the fossilization process does not allow the use of the C dating method. The authors thank Dr. Thermoluminescence Dating. London: Academic Press, p. The northernmost record of Catagonus stenocephalus Lund in Reinhardt, Mammalia, Cetartiodactyla and its palaeoenvironmental and palaeobiogeographical significance.

J South Am Earth Sci Health Phys 98 2 : ESR isochron dating for teeth: A brief demonstration in solving the external dose calculation problem. Appl Radiat Isot 44 : Ancient TL 17 2 : Quat Geochronol 6 5 : Quaternary Res 77 3 : Quat Int A BBC investigation has found that fake social media accounts and blogs were used to back the candidacy of Dilma Rousseff in Brazil during the election campaign. Rouseff won the election and was later re-elected before being impeached on corruption charges. She and her party deny any knowledge of the fakes. He looked like an ordinary guy.

Armando Santiago Jr was - apparently - 56 years old, married, and lived in Pocos de Caldas, a small city in south-east Brazil. On the social network Orkut - the most popular in Brazil at the time - Armando described himself as "a Brazilian citizen outraged by the criminal actions of the opposition in the election campaign. His influential blog was called "Seja Dita Verdade" "Let the truth be said" and its stated mission was to transmit "transparent news".

And Armando was not the only fake. During the election campaign, one company ran a network of false social media accounts in an attempt to boost the PT and Rousseff, according to whistleblowers inside the operation.

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BBC Brazil interviewed three of the four people running the Armando blog. They say they were recruited by a political marketing firm based in Sao Paulo to carry out the work. They say their job was to feed the blog with posts denouncing alleged rumours about Rousseff, as well as posts attacking her main opponent, Jose Serra, the PSDB candidate.

The blog also created false news stories which were spread by the team using other fake or "sock puppet" social media profiles - at least of them on Twitter. Although now, eight years later, the Twitter profiles are inactive, BBC Brasil has found that more than 80 of them still exist in other words, they haven't been suspended or banned.

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They include users like "Juliana Miranda", who wrote everyday tweets about her psychology course "Freud is one of my passions" and others in support of the PT "we want Dilma! Profile pictures were copied or stolen - in the case of "Juliana", from a Finnish blogger. The tactics were replicated in later elections. Last year, BBC Brasil revealed that fake profiles and misinformation were used in Brazil during the election , when a Rio-based company paid about 40 employees spread across Brazil to create and feed thousands of fake profiles, which were sold as a service to politicians. It's extremely difficult to gauge what impact, if any, the fake accounts had on the election, which was won by Rousseff.

She won re-election four years later before being impeached on corruption charges in Brazil's current president is Michel Temer, who was once her vice-president.