The integrable quantum group invariant A_{2n-1}^(2) and D_{n+1}^(2) open spin chains

A family of A_{2n}^(2) integrable open spin chains with U_q(C_n) symmetry was recently identified in arXiv:1702.01482. We identify here in a similar way a family of A_{2n-1}^(2) integrable open spin chains with U_q(D_n) symmetry, and two families of D_{n+1}^(2) integrable open spin chains with U_q(B_n) symmetry. We discuss the consequences of these symmetries for the degeneracies and multiplicities of the spectrum. We propose Bethe ansatz solutions for two of these models, whose completeness we check numerically for small values of n and chain length N. We find formulas for the Dynkin labels in terms of the numbers of Bethe roots of each type, which are useful for determining the corresponding degeneracies. In an appendix, we briefly consider D_{n+1}^(2) chains with other integrable boundary conditions, which do not have quantum group symmetry.Comment: 47 pages; v2: two references added and minor change

Defects in the supersymmetric mKdV hierarchy via Backlund transformations

The integrability of the ${\cal N}=1$ supersymmetric modified Korteweg de-Vries (smKdV) hierarchy in the presence of defects is investigated through the construction of its super B\"acklund transformation. The construction of such transformation is performed by using essentially two methods: the B\"acklund-defect matrix approach and the superfield approach. Firstly, we employ the defect matrix associated to the hierarchy which turns out to be the same for the supersymmetric sinh-Gordon (sshG) model. The method is general for all flows and as an example we derive explicitly the B\"acklund equations in components for the first few flows of the hierarchy, namely $t_3$ and $t_5$. Secondly, the supersymmetric extension of the B\"acklund transformation in the superspace formalism is constructed for those flows. Finally, this super B\"acklund transformation is employed to introduce type I defects for the supersymmetric mKdV hierarchy. Further integrability aspects by considering modified conserved quantities are derived from the defect matrix.Comment: 40 pages. Some comments and references added. Version accepted for publication in JHE

Viabilidade econômica da produção de cordeiros mantidos em dois tipos de pastagem com suplementação.

bitstream/item/136436/1/42-Janaina-Viabilidade.pd

Sorgo-sacarino ensilado como alternativa para alimentação de ruminantes.

bitstream/item/211964/1/COT-255.pd

Caracterização das principais modalidades de sistemas integrados de produção agropecuária na Região Centro-Sul de Mato Grosso do Sul.

Metodologia do trabalho; Municípios avaliados; Número de propriedades por município; Caracterização dos produtores; Local de residência; Posse e uso da terra; tipo de solo; Perfil tecnológico dos produtores; Atividade pioneira na propriedade; Rotação sistemática de culturas nas áreas agrícolas; Modalidades de sistemas integrados; Modalidades de condução da atividade de integração; Tempo de adoção dos sistemas integrados; Dificuldades encontradas na implantação dos sistemas integrados; Decisões futuras; Assistência técnica; Produtividade das culturas e da pecuária; Sistema produtivo bovino; Pastagem utilizada nos sistemas integrados; Suplementação alimentar.bitstream/item/120672/1/DOC2014125-1.pd