2,496 research outputs found

    Rumo às boas práticas.

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    Subclinical hypothyroidism and conception in a woman with primary infertility

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    Hypothyroidism is the most common endocrinological problem affecting women who present with ovulatory dysfunction resulting in infertility.It’s milder form, subclinical hypothyroidism (SH) characterized by mildly elevated thyroid stimulating hormone levels and normal free thyroxine levels, may also contribute to disturbed reproductive function. We report a case highlighting the beneficial effects of levothyroxine replacement therapy in women with subclinical hypothyroidsm presenting with infertility

    Effect of vanadium and carbon content on the sinterability of water atomised high speed steel powders

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    This paper presents the results of an investigation into the sintering behaviour of three vanadium enriched variants of T42 high-speed steel. Powders were prepared by water atomization with vanadium and carbon contents of 6-8 wt% and 2.2 -2.7 wt%, respectively. These were annealed, die pressed and sintered in vacuum. All three alloys were sintered to full density giving "as-sintered" microstructures comprising globular MC carbides dispersed in a martensitic matrix. Optimum sintering temperatures were in the range 1240-1250 degrees C with lower optimum temperatures associated with higher carbon levels. Sintering characteristics are correlated with phase diagrams calculated using ThermoCalc (TM) software and TCFe2000 database. The implications for the design of sinterable vanadium containing high-speed steels are discussed

    Levantamento da infestação de plantas daninhas associada a uma pastagem cultivada de baixa produtividade no nordeste paraense.

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    A região do trópico úmido amazônico ocupa 350 milhões de hectares, constituindo a maior área de fronteira agrícola do planeta. A pecuária como exploração do uso da terra é a principal forma de ocupação e de desmatamento na região, apesar da baixa produtividade e das conseqüências ambientais. O declínio da produtividade da pastagem está associado, entre outras, ao manejo inadequado e à elevada infestação de plantas daninhas herbáceas e arbustivas, anuais ou perenes, geralmente denominadas ?juquira? na região. Se essas plantas não forem controladas adequadamente, podem levar à degradação da pastagem, resultando na completa perda de produtividade e no posterior abandono da área. Com o objetivo de identificar as plantas daninhas mais importantes que ocorrem em área de pastagem de baixa produtividade no município de Terra Alta, PA (0º 58? S e 47º 52? W. Gr.), foi efetuado um levantamento florístico em 0,33 ha de área cultivada com capim-quicuio-da-amazônia (Brachiaria humidicola). Foram registrados 4.700 indivíduos, distribuídos em 17 famílias botânicas, representadas por 36 espécies vegetais. Destacaram-se as famílias Poaceae, Rubiaceae, Fabaceae, Asteraceae e Solanaceae, sendo encontrado em cada uma delas cinco, cinco, quatro, três e três espécies, respectivamente. As plantas daninhas consideradas de maior importância na comunidade vegetal foram: Borreria verticillata, Hyptis atrorubens, Rolandra argentea, Desmodium canum, Panicum pilosum, Davilla rugosa, Imperata brasiliensis, Paspalum maritimum, Vernonia scorpioides e Vismia guianens

    Plantas daninhas de várzea do rio Guamá, estuário Amazônico.

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    No período de 1974 a 1994, foram realizados levantamentos botânicos e florísticos complementares para identificação de plantas daninhas, na área de várzea do rio Guamá, onde registraram-se 61 famílias, representadas por 245 especies. As famílias Poaceae, Cyperaceae, Papilionaceae, Euphorbiaceae, Mimosaceae e Asteraceae, destacaram-se como as mais importantes com 34, 23, 20, 11, 10 e 9 especies, respectivamente. O estudo reuniu informações que irão subsidiar as pesquisas de manejo e controle integrado de plantas daninhas em área de várzea, quando utilizadas em explorações agropecuárias intensivas.bitstream/item/48870/1/Boletim-Pesquisa-186-CPATU.pd

    Emergence of classicality in small number entangled systems

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    We show the transition from a fully quantized interaction to a semiclassical one in entangled small number quantum systems using the quantum trajectories approach. In particular, we simulate the microwave Ramsey zones used in Rydberg atom interferometry, filling in the gap between the strongly entangling Jaynes Cummings evolution and the semiclassical rotation of the atomic internal states. We also correlate the information flowing with leaking photons to the entanglement generation between cavity field and flying atom and detail the roles played by the strong dissipation and the external driving force in preserving atomic coherence through the interaction.Comment: 4 pages, 6 figure

    Equilibrium and Disorder-induced behavior in Quantum Light-Matter Systems

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    We analyze equilibrium properties of coupled-doped cavities described by the Jaynes-Cummings- Hubbard Hamiltonian. In particular, we characterize the entanglement of the system in relation to the insulating-superfluid phase transition. We point out the existence of a crossover inside the superfluid phase of the system when the excitations change from polaritonic to purely photonic. Using an ensemble statistical approach for small systems and stochastic-mean-field theory for large systems we analyze static disorder of the characteristic parameters of the system and explore the ground state induced statistics. We report on a variety of glassy phases deriving from the hybrid statistics of the system. On-site strong disorder induces insulating behavior through two different mechanisms. For disorder in the light-matter detuning, low energy cavities dominate the statistics allowing the excitations to localize and bunch in such cavities. In the case of disorder in the light- matter coupling, sites with strong coupling between light and matter become very significant, which enhances the Mott-like insulating behavior. Inter-site (hopping) disorder induces fluidity and the dominant sites are strongly coupled to each other.Comment: about 10 pages, 12 figure
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