Introduction: Ideologies of Youth

In a number of countries in Africa, such as Uganda and Kenya, national publics have been discussing whether citizens of age 50 or even 60 should be regarded as ‘youth’. Under the current dispensation of donor funding, relief programmes and international aid, these discussions have made the ‘youth’ the major beneficiary of what these policies offer and imply. There is a general feeling, however, that these policies should target all age groups in their youth-oriented programmes. If the donorideology prescribes youthfulness for societal and developmental relevance, it will then dictate practice. This is just one example of what this special issue will address in an attempt to explore what we see as an emerging development in Africa and beyond: the rise of youth as an ideology. Whereas Africa has witnessed the rise of a fast-growing study of youth as a phenomenon and as a concept, the aspect of youth as ideology has, so far, not been elaborated on

An effective singular oscillator for Duffin-Kemmer-Petiau particles with a nonminimal vector coupling: a two-fold degeneracy

Scalar and vector bosons in the background of one-dimensional nonminimal vector linear plus inversely linear potentials are explored in a unified way in the context of the Duffin-Kemmer-Petiau theory. The problem is mapped into a Sturm-Liouville problem with an effective singular oscillator. With boundary conditions emerging from the problem, exact bound-state solutions in the spin-0 sector are found in closed form and it is shown that the spectrum exhibits degeneracy. It is shown that, depending on the potential parameters, there may or may not exist bound-state solutions in the spin-1 sector.Comment: 1 figure. arXiv admin note: substantial text overlap with arXiv:1009.159

Calagem e parcelamento da adubação fosfatada em porta-enxertos de seringueira.

bitstream/item/57409/1/Belem-BP6.pd

Off-shell N=2 tensor supermultiplets

A multiplet calculus is presented for an arbitrary number n of N=2 tensor supermultiplets. For rigid supersymmetry the known couplings are reproduced. In the superconformal case the target spaces parametrized by the scalar fields are cones over (3n-1)-dimensional spaces encoded in homogeneous SU(2) invariant potentials, subject to certain constraints. The coupling to conformal supergravity enables the derivation of a large class of supergravity Lagrangians with vector and tensor multiplets and hypermultiplets. Dualizing the tensor fields into scalars leads to hypermultiplets with hyperkahler or quaternion-Kahler target spaces with at least n abelian isometries. It is demonstrated how to use the calculus for the construction of Lagrangians containing higher-derivative couplings of tensor multiplets. For the application of the c-map between vector and tensor supermultiplets to Lagrangians with higher-order derivatives, an off-shell version of this map is proposed. Various other implications of the results are discussed. As an example an elegant derivation of the classification of 4-dimensional quaternion-Kahler manifolds with two commuting isometries is given.Comment: 36 page

Application of qualitative risk assessment to prioritize hazards in pork products in Brazil.

SafePork 2017