QUALIDADE DO VINHO PRODUZIDO NO MUNICÍPIO DE COLOMBO NA SAFRA 2000

O presente trabalho é uma das etapas do Projeto de Extensão No 248/PROEC - MELHORIA DA QUALIDADE DO VINHO PRODUZIDO NO MUNICÍPIO DE COLOMBO. Após o trabalho emcampo, com visitas às diversas vinícolas para acompanhamento do proceso de produção, foram realizadas análises físico-químicas das diferentes amostras de vinhos, cujos resultados foram comparados com os padrões fixados pelo Ministério da Agricultura, procurando relacionar características impróprias com problemas nos procedimentos adotados durante a fase de produção. Abstract The aims of this study were to investigate and characterize the flaws occuring during the production of wine in the surroundings vines of Colombo, Paraná, Brazil. Analysis of the physical-chemical properties of different samples obtained from the final wine batches was performed and the results compared to standards stablished by the Brazilian Agriculture Ministry, and the results discussed (Projeto No 248/PROEC MELHORIA DA QUALIDADE DO VINHO PRODUZIDO NO MUNICÍPIO DE COLOMBO

Spanning forests and the q-state Potts model in the limit q \to 0

We study the q-state Potts model with nearest-neighbor coupling v=e^{\beta J}-1 in the limit q,v \to 0 with the ratio w = v/q held fixed. Combinatorially, this limit gives rise to the generating polynomial of spanning forests; physically, it provides information about the Potts-model phase diagram in the neighborhood of (q,v) = (0,0). We have studied this model on the square and triangular lattices, using a transfer-matrix approach at both real and complex values of w. For both lattices, we have computed the symbolic transfer matrices for cylindrical strips of widths 2 \le L \le 10, as well as the limiting curves of partition-function zeros in the complex w-plane. For real w, we find two distinct phases separated by a transition point w=w_0, where w_0 = -1/4 (resp. w_0 = -0.1753 \pm 0.0002) for the square (resp. triangular) lattice. For w > w_0 we find a non-critical disordered phase, while for w < w_0 our results are compatible with a massless Berker-Kadanoff phase with conformal charge c = -2 and leading thermal scaling dimension x_{T,1} = 2 (marginal operator). At w = w_0 we find a "first-order critical point": the first derivative of the free energy is discontinuous at w_0, while the correlation length diverges as w \downarrow w_0 (and is infinite at w = w_0). The critical behavior at w = w_0 seems to be the same for both lattices and it differs from that of the Berker-Kadanoff phase: our results suggest that the conformal charge is c = -1, the leading thermal scaling dimension is x_{T,1} = 0, and the critical exponents are \nu = 1/d = 1/2 and \alpha = 1.Comment: 131 pages (LaTeX2e). Includes tex file, three sty files, and 65 Postscript figures. Also included are Mathematica files forests_sq_2-9P.m and forests_tri_2-9P.m. Final journal versio