Analytical BPS Maxwell-Higgs vortices

We have established a prescription for the calculation of analytical vortex solutions in the context of generalized Maxwell-Higgs models whose overall dynamics is controlled by two positive functions of the scalar field. We have also determined a natural constraint between these functions and the Higgs potential allowing the existence of axially symmetric Bogomol'nyi-Prasad-Sommerfield (BPS) solutions possessing finite energy. Furthermore, when the generalizing functions are chosen suitably, the nonstandard BPS equations can be solved exactly. We have studied some examples, comparing them with the usual Abrikosov-Nielsen-Olesen (ANO) solution. The overall conclusion is that the analytical self-dual vortices are well-behaved in all relevant sectors, strongly supporting the generalized models they belong themselves. In particular, our results mimic well-known properties of the usual (numerical) configurations, as localized energy density, while contributing to the understanding of topological solitons and their description by means of analytical methods.Comment: 8 pages, 4 figure

Mudanças, mitos e incertezas da produção de feijão: 1985 a 2010.

O presente trabalho tem por objetivo apresentar análises de movimentos e quantidade ofertada por estado e safra, considerando apenas a produção do feijão comum.CONAFE

Calagem e adubação do algodoeiro no cerrado.

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Boas práticas para produção de mudas de goiabeiras isentas de nematóides.

A qualidade física e fitossanitária de mudas é fator fundamental ao sucesso do cultivo de plantas assim propagadas. No caso da goiabeira, mudas Isentas de nematóldes-de-galhas, principalmente Meoldogyne mayaguensls, constituem-se num dos requisitos de maior importância para o bom desenvolvimento de pomares, além de evitar a disseminação do nematólde a curtas e longas distâncias. As sugestões aqui apresentadas objetivam orientar a produção de mudas de goiabeira conforme os padrões de qualidade recomendados.bitstream/item/132820/1/ID-42057.pd

Does cultural background influence the dissemination and severity of the COVID-19 pandemic?

The COVID-19 pandemic has spread throughout the globe affecting countries worldwide. However, several differences have been observed in the number of daily new cases, the COVID-19 reproduction rate, and the severity of the disease in different countries. Previous studies have mostly highlighted government restriction policies to mitigate the pandemic effects as reasons for such differences. This study focuses on 101 countries and proposes that each country’s cultural background is also accountable for such differences. We considered the six Hofstede’s cultural dimensions (power distance, individualism, masculinity, uncertainty avoidance, long term orientation, and indulgence) and statistically analyzed their correlation with several COVID-19 impact metrics in comparison to several restriction policies. Our results support our claim that national culture influences both acceptance and subsequent adoption of restriction policies and the implementation by each government of those policies. We highlight that the attitudes towards and trust in political institutions, policies and governance is influenced by the cultural background, which is reflected in the pandemic numbers. As a main takeaway from this study, we conclude that data-driven models which aim at predicting the pandemic impact evolution at a global scale should also include variables that reflect the cultural background of each nation.info:eu-repo/semantics/publishedVersio