Evidence of random magnetic anisotropy in ferrihydrite nanoparticles based on analysis of statistical distributions

We show that the magnetic anisotropy energy of antiferromagnetic ferrihydrite depends on the square root of the nanoparticles volume, using a method based on the analysis of statistical distributions. The size distribution was obtained by transmission electron microscopy, and the anisotropy energy distributions were obtained from ac magnetic susceptibility and magnetic relaxation. The square root dependence corresponds to random local anisotropy, whose average is given by its variance, and can be understood in terms of the recently proposed single phase homogeneous structure of ferrihydrite.Comment: 6 pages, 2 figure

Intenções reprodutivas de mulheres que vivenciam regime de alta fecundidade em um grande centro urbano

This quantitative and population-based study aimed to identify reproductive intentions of women with five or more children living in Curitiba, Paraná. 441 women were interviewed in their homes between the years 2006 to 2008. Frequencies were calculated, as well as Student's t test and Spearman coefficient for some variables. To analyse the open questions it was used content analysis and worked out tables with categories , their frequencies and percentages. The study revealed that for 51% of women the ideal number of children would have been two children; 10% had the number of children they wanted. In 113 cases (40.4%) the husbands would rather have a larger number of children than women. Difficulties were identified in the definition and achievement of desired fertility, besides failures in reproductive health care and social and gender inequalities. Health managers should monitor the differentials in fertility rates in order to pursue social justice and ensure human rights, as well as sexual and reproductive rights in Brazil.Neste estudo quantitativo e de base populacional objetivou-se identificar as intenções reprodutivas de mulheres com cinco ou mais filhos, residentes em Curitiba, Paraná. Foram entrevistadas 441 mulheres em seus domicílios entre os anos de 2006 a 2008. Calcularam-se frequências, e o teste t de Student e o coeficiente de Spearman para algumas variáveis. Para análise das perguntas abertas utilizou-se a análise de conteúdo e se elaboraram tabelas com as categorias e as respectivas frequências. O estudo revelou que para 51% das mulheres o número ideal de filhos seria dois; 10% tiveram o número de filhos que desejavam. Em 113 casos (40,4%) o marido preferia ter um número maior de filhos do que as mulheres. Identificaram-se dificuldades na definição e na conquista da fecundidade desejada, falhas na assistência à saúde reprodutiva e desigualdades sociais e de gênero. O monitoramento pelos gestores de saúde dos diferenciais de fecundidade é necessário para o alcance da justiça social e a garantia dos direitos humanos, sexuais e reprodutivos, no Brasil.Universidade Tuiuti do Paraná Programa de Mestrado e Doutorado em Distúrbios da ComunicaçãoUniversidade de São PauloUNIFESP Departamento de Medicina PreventivaUniversidade Federal de Minas Gerais Escola de Enfermagem Departamento Materno Infantil e Saúde PúblicaUniversidade de São Paulo Faculdade de Saúde Pública Departamento de Saúde Materno-infantilUNIFESP, Depto. de Medicina PreventivaSciEL

Boletim and Arquivos: scientific communication until the creation of the Revista de Saúde Pública

ABSTRACT Based on historical references of scientific communication, we analyzed the issues of the Boletim do Instituto de Higiene de São Paulo and of the Arquivos da Faculdade de Higiene e Saúde Pública da Universidade de São Paulo. Published respectively from 1919 to 1946 and from 1947 to 1966, they totaled 120 issues. In their 48 years of publication, their goal was to disseminate the scientific production of the institution and to legitimize the theoretical debate of the field, in addition to supporting the public health intervention models, written by leading researchers of the institution and by contributors and managers in the field of public health. Both the Boletim and the Arquivos were recognized as scientific communication of national reference, and have laid the foundations for the creation of the Revista de Saúde Pública, in 1967