The irreducible unitary representations of the extended Poincare group in (1+1) dimensions

We prove that the extended Poincare group in (1+1) dimensions is non-nilpotent solvable exponential, and therefore that it belongs to type I. We determine its first and second cohomology groups in order to work out a classification of the two-dimensional relativistic elementary systems. Moreover, all irreducible unitary representations of the extended Poincare group are constructed by the orbit method. The most physically interesting class of irreducible representations corresponds to the anomaly-free relativistic particle in (1+1) dimensions, which cannot be fully quantized. However, we show that the corresponding coadjoint orbit of the extended Poincare group determines a covariant maximal polynomial quantization by unbounded operators, which is enough to ensure that the associated quantum dynamical problem can be consistently solved, thus providing a physical interpretation for this particular class of representations.Comment: 12 pages, Revtex 4, letter paper; Revised version of paper published in J. Math. Phys. 45, 1156 (2004

Levantamento de solos do município de Olho D'água do casado - Alagoas.

bitstream/item/73315/1/13983.pdfContém um mapa color.; escala 1:100.000

Bilateral peripheral facial palsy and mastoid infiltration as symptoms of relapsed acute myeloid leukemia

AbstractBackgroundAlthough Bell's palsy (BP) is the most common cause of peripheral facial palsy (PFP), other etiologies merit investigation.Case reportA 60-year-old female patient presented with recurrent bilateral PFP. Although the patient had a history of acute myeloid leukemia (AML), she had initially been diagnosed with BP-related PFP and had been treated accordingly. When the PFP recurred, additional diagnostic tests were performed. The resulting immunohistochemical profile included CD3 positivity in a few reactive T lymphocytes; positivity for myeloperoxidase in atypical cells; and focal positivity for CD34 and proto-oncogene c-kit proteins in neoplastic cells, thus confirming the suspicion of mastoid infiltration caused by relapsed AML.ConclusionIn patients with neoplastic disease, a finding of PFP calls for extensive investigation in order to rule out the involvement of the temporal bone

Mapa de solos do município de Olho D'água do Casado, AL.

bitstream/item/73313/1/Solos-Olho-dagua.pd

Hidden new physics in meson decays

A model-independent analysis of a non-standard pseudoscalar contribution to leptonic meson decays ($\pi$,$K$,$D$,$D_s$ and $B$) is presented. As also seen from similar analyses in the literature, we find that two distinct regions in the parameter space arise, a region where the standard model contribution is predominant and a region where the new physics terms cancel precisely. So far, the latter has been regarded as a fine-tuning and for this reason it was neglected from the very beginning. This paper argues that this cancellation appears naturally in a class of models, most notably those that realize the Glashow-Weinberg-Paschos mechanism for avoiding flavor-changing neutral currents, in particular in the lepton sector. Thus, such a region that allows for larger Yukawa couplings ($10^{-4}\lesssim (G_\eta^{P}/G_F)U^{-1}m_l^{-1} \lesssim 10^{-3}$ MeV$^{-1}$) cannot be readily ruled out solely by the meson leptonic decays and is degenerated with the Standard Model prediction in these decays

Influence of sowing times and plant populations on the agronomic performance of maize hybrids.

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Soil microbial biomass and organic matter fractions during transition from conventional to organic farming systems.

The aim of this study was to investigate the response of soil microbial biomass and organic matter fractions during the transition from conventional to organic farming in a tropical soil. Soil samples were collected from three different plots planted with Malpighia glaba: conventional plot with 10 years (CON); transitional plot with 2 years under organic farming system (TRA); organic plot with 5 years under organic farming system (ORG). A plot under native vegetation (NV) was used as a reference. Soil microbial biomass C (MBC) and N (MBN), soil organic carbon (SOC) and total N (TN), soil organic matter fractioning and microbial indices were evaluated in soil samples collected at 0-5, 5-10, 10-20 and 20-40 cm depth. SOC and fulvic acids frac- tion contents were higher in the ORG system at 0-5 cm and 5-10 cm depths. Soil MBC was highest in the ORG, in all depths, than in others plots. Soil MBN was similar between ORG, TRA and NV in the surface layer. The lowest values for soil MBC and MBN were observed in CON plot. Soil microbial biomass increased gradually from conventional to organic farming, leading to consistent and distinct differences from the conventional control by the end of the second year