MAPEAMENTO GEOMORFOLÓGICO DO MUNICÍPIO DE CAMPO LARGO DO PIAUÍ, PIAUÍ.

O artigo tem como objetivo mapear e classificar as unidades de relevo do município de Campo Largo, PI, localizado na microrregião do Baixo Parnaíba. Para o estudo foram utilizadas imagens óticas do Landsat OLI 8, folhas topográficas e modelo digital de elevação SRTM-TOPODATA. Identificando sete unidades: os terraços e planícies fluviolacustres, os depósitos coluviais e lacustres, os agrupamentos de mesas, as mesas, os tabuleiros, os vales associados às mesas e os vales associados aos tabuleiros

Entanglement between Demand and Supply in Markets with Bandwagon Goods

Whenever customers' choices (e.g. to buy or not a given good) depend on others choices (cases coined 'positive externalities' or 'bandwagon effect' in the economic literature), the demand may be multiply valued: for a same posted price, there is either a small number of buyers, or a large one -- in which case one says that the customers coordinate. This leads to a dilemma for the seller: should he sell at a high price, targeting a small number of buyers, or at low price targeting a large number of buyers? In this paper we show that the interaction between demand and supply is even more complex than expected, leading to what we call the curse of coordination: the pricing strategy for the seller which aimed at maximizing his profit corresponds to posting a price which, not only assumes that the customers will coordinate, but also lies very near the critical price value at which such high demand no more exists. This is obtained by the detailed mathematical analysis of a particular model formally related to the Random Field Ising Model and to a model introduced in social sciences by T C Schelling in the 70's.Comment: Updated version, accepted for publication, Journal of Statistical Physics, online Dec 201

Genetic characterization of cassava (Manihot esculenta) landraces in Brazil assessed with simple sequence repeats

Based on nine microsatellite loci, the aim of this study was to appraise the genetic diversity of 42 cassava (Manihot esculenta) landraces from selected regions in Brazil, and examine how this variety is distributed according to origin in several municipalities in the states of Minas Gerais, São Paulo, Mato Grosso do Sul, Amazonas and Mato Grosso. High diversity values were found among the five above-mentioned regions, with 3.3 alleles per locus on an average, a high percentage of polymorphic loci varying from 88.8% to 100%, an average of 0.265 for observed heterozygosity and 0.570 for gene diversity. Most genetic diversity was concentrated within the regions themselves (HS = 0.52). Cluster analysis and principal component based scatter plotting showed greater similarity among landraces from São Paulo, Mato Grosso do Sul and Amazonas, whereas those from Minas Gerais were clustered into a sub-group within this group. The plants from Mato Grosso, mostly collected in the municipality of General Carneiro, provided the highest differentiation. The migration of human populations is one among the possible reasons for this closer resemblance or greater disparity among plants from the various regions

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time, and attempts to address it require a clear understanding of how ecological communities respond to environmental change across time and space. While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes, vast areas of the tropics remain understudied. In the American tropics, Amazonia stands out as the world's most diverse rainforest and the primary source of Neotropical biodiversity, but it remains among the least known forests in America and is often underrepresented in biodiversity databases. To worsen this situation, human-induced modifications may eliminate pieces of the Amazon's biodiversity puzzle before we can use them to understand how ecological communities are responding. To increase generalization and applicability of biodiversity knowledge, it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple organism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region's vulnerability to environmental change. 15%–18% of the most neglected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lost

Rute E Alberto Resolveram Ser Turistas: Literary Reading For Children During The Vargas Period [rute E Alberto Resolveram Ser Turistas A Leitura Litera´ria Para Crianc¸as No Peri´odo Vargas]

Having as general scope the study of children's literature and reading during the period of Getu´lio Vargas, this article studies the work done by the Children's Literature National Committee (CNLI) and its understanding of this kind of reading. The analysis shows how much the perspective of those intellectuals was determined by the tensions between the playful and the pedagogical. After that, the paper discusses the pedagogical innovation proposed by the movement called Escola Nova and its affinities with the concept of literary reading proposed by the Committee. Finally, the text analyses the book Rute e Alberto resolveram ser turistas (1938), by Ceci´lia Meireles. We observed that, in this eminently pedagogical book, the author evidenced her links with the values promoted by Escola Nova and tried to use some literary devices, such as character creation, setting, dialogues, and narratives, but was unable to solve the complex dynamics of teaching and playfulness. The result is a work which, in comparison with other works by Meireles, is below her literary achievements.1957329347Rio de Janeiro, CPDOC/FGV. CG g 36.04.29. Pastas 1, 2, 3, 4de Azevedo, F., (2010) Manifesto dos pioneiros da Educac¸ão Nova (1932) e dos educadores (1959), , Recife: Fundac¸ão Joaquim Nabuco, Ed. MassanganaBakhtin, (1994) Este´tica da criac¸ão verbal., , São Paulo: Martins FontesDebus, E.S.D., (2004) Monteiro Lobato e o leitor, esse conhecido., , Floriano´polis: Editora da UFSCGoldstein, N.S., Ceci´lia Meireles, autora de livros voltados aos pequenos leitores. (2010) Revista Linha D'a´gua, (23), pp. 47-57. , http://www.revistas.usp.br/linhadagua/article/view/62339/65143, São Paulo: Universidade de São Paulo, FFLCH, Edic¸ão Especial de 30 anos. Disponi´vel em:. Acesso em: 9 jun. 2011Gomes, A.C., As aventuras de Tibicuera: literatura infantil, histo´ria do Brasil e poli´tica cultural na Era Vargas. (2003) Revista da USP, São Paulo: USP, (59), pp. 116-133. , set./novLamego, V., (1996) A farpa na lira: Ceci´lia Meireles na Revoluc¸ão de, 30. , Rio de Janeiro: RecordLoˆbo, Y., (2010) Ceci´lia Meireles, , Recife: Fundac¸ão Joaquim Nabuco, Ed. MassanganaMeireles, C., (1938) Rute e Alberto resolveram ser turistas., , Porto Alegre: Livraria do GloboMeireles, C., (1944) Leituras infantis., , Rio de Janeiro: Imprensa NacionalMeireles, C., (1984) Problemas de literatura infantil., 3. , ed. Rio de Janeiro: Nova FronteiraMeireles, C., (1993) Poesia completa, 4. , ed. Rio de Janeiro: Nova AguilarNeves, M.S., Por mares nunca dantes navegados: Ceci´lia Meireles e a literatura infantil (2011), http://www.historiaecultura.pro.br/modernosdescobrimentos/desc/meireles/pormares.htm#fn1, s/d. Disponi´vel em: Acesso em: 9 junPimenta, J., Leitura e encantamento: a biblioteca infantil do Pavilhão Mourisco (2001) Neves, Margarida de SouzaLoˆbo, Yolanda LimaMignot, Ana Chrystina Venancio. Ceci´lia Meireles: a poe´tica da educac¸ão., , Rio de Janeiro: PUC-RioLoyolaTeixeira, A., (1934) Educac¸ão progressiva: para a aventura da reconstruc¸ão da educac¸ão., , São Paulo: Editora NacionalVidal, D.G., Da sonhadora para o arquiteto: Ceci´lia Meireles escreve a Fernando de Azevedo. (2001) Neves, Margarida de SouzaLoˆbo, Yolanda LimaMignot, Ana Chrystina Venancio. Ceci´lia Meireles: a poe´tica da educac¸ão, , Rio de Janeiro: PUC-RioLoyolaZilberman, R., Em busca da crianc¸a leitora. (2001) Neves, Margarida de SouzaLoˆbo, Yolanda LimaMignot, Ana Chrystina Venancio. Ceci´lia Meireles: a poe´tica da educac¸ão, , Rio de Janeiro: PUC-RioLoyol