Uma estratégia interativa para a expansão de expressões de busca utilizando vocabulário controlado.

Neste trabalho apresenta-se a evolução do sistema de busca da Agência de Informação Embrapa, a partir de uma estratégia interativa de expansão de expressões de busca. Embora a Agência prime pela oferta de informação altamente qualificada, seus usuários não utilizam todo esse potencial, por desconhecer seus detalhes. A estratégia proposta permite que o usuário especifique sua expressão de busca e o sistema sugira formas de expandi-la, deixando a escolha final para o usuário. Os experimentos realizados foram baseados em possibilidades automaticamente geradas e medidos de forma objetiva, considerando-se a precisão e a cobertura das buscas realizadas. Como esperado, os experimentos mostram que o uso de uma melhor qualificação das expressões permite obter resultados mais precisos e que a evolução da ferramenta atingiu seu objetivo.bitstream/item/56769/1/BolPesq30.pd

Expansão de busca utilizando vocabulário controlado.

O objetivo dessa proposta é expandir as expressões de busca especificadas pelo usuário, de modo a abrir o leque de resultados, melhorando especialmente a cobertura destes, conferindo uma maior precisão nos resultados das buscas

Sporadic Medullary Thyroid Carcinoma: Clinical Data From A University Hospital

INTRODUCTION: Medullary thyroid carcinoma may occur in a sporadic (s-medullary thyroid carcinoma, 75%) or in a multiple endocrine neoplasia type 2 form (MEN2, 25%). These clinical forms differ in many ways, as s-medullary thyroid carcinoma cases are RET-negative in the germline and are typically diagnosed later than medullary thyroid carcinoma in MEN2 patients. In this study, a set of cases with s-medullary thyroid carcinoma are documented and explored. PURPOSE: To document the phenotypes observed in s-medullary thyroid carcinoma cases from a university group and to attempt to improve earlier diagnosis of s-medullary thyroid carcinoma. Some procedures for diagnostics are also recommended. METHOD: Patients (n=26) with apparent s-medullary thyroid carcinoma were studied. Their clinical data were reviewed and peripheral blood was collected and screened for RET germline mutations. RESULTS: The average age at diagnosis was 43.9 years (± 10.82 SD) and did not differ between males and females. Calcitonin levels were increased in all cases. Three patients presented values that were 100-fold greater than the normal upper limit. Most (61.54%) had values that were 20-fold below this limit. Carcinoembryonic antigen levels were high in 70.6% of cases. There was no significant association between age at diagnosis, basal calcitonin levels or time of disease onset with thyroid tumor size (0.6-15 cm). Routine thyroid cytology yielded disappointing diagnostic accuracy (46.7%) in this set of cases. After total thyroidectomy associated with extensive cervical lymph node resection, calcitonin values remained lower than 5 pg/mL for at least 12 months in eight of the cases (30.8%). Immunocyto- and histochemistry for calcitonin were positive in all analyzed cases. None of the 26 cases presented germline mutations in the classical hotspots of the RET proto-oncogene. CONCLUSION: Our cases were identified late. The basal calcitonin measurements and immunostaining for calcitonin were highly useful for diagnosing s-medullary thyroid carcinoma. The rate of complete patient recovery was low, and none of the parameters analyzed were useful predictors of the thyroid tumor size. Our findings support previous recommendations for routine serum calcitonin evaluation and immunostaining analysis involving single thyroid nodules

Dissipative collisions in 16^{16}O + 27^{27}Al at Elab_{lab}=116 MeV

The inclusive energy distributions of fragments (3$\leq$Z$\leq$7) emitted in the reaction $^{16}$O + $^{27}$Al at $E_{lab} =$116 MeV have been measured in the angular range $\theta_{lab}$= 15$^\circ$ - 115$^\circ$. A non-linear optimisation procedure using multiple Gaussian distribution functions has been proposed to extract the fusion-fission and deep inelastic components of the fragment emission from the experimental data. The angular distributions of the fragments, thus obtained, from the deep inelastic component are found to fall off faster than those from the fusion-fission component, indicating shorter life times of the emitting di-nuclear systems. The life times of the intermediate di-nuclear configurations have been estimated using a diffractive Regge-pole model. The life times thus extracted ($\sim 1 - 5\times 10^{-22}$ Sec.) are found to decrease with the increase in the fragment charge. Optimum Q-values are also found to increase with increasing charge transfer i.e. with the decrease in fragment charge.Comment: 9 pages, 4 figures, 1 tabl

Physalis pruinosa var. argentina J.M. Toledo & Barboza

Sierra de Los Llanos, falda este: Alrededores del Dique de OltapublishedVersio

Enabling fast power integrity transient analysis through parameterized small-signal macromodels

In this paper, we present an automated strategy for extracting behavioral small-signal macromodels of biased nonlinear circuit blocks. We discuss in detail the case study of a Low DropOut (LDO) voltage regulator, which is an essential part of the power distribution network in electronic systems. We derive a compact yet accurate surrogate model of the LDO, which enables fast transient power integrity simulations, including all parasitics due to the specific layout of the LDO realization. The model is parameterized through its DC input voltage and its output current and is thus available as a SPICE netlist. Numerical experiments show that a speedup up to 700X is achieved when replacing the extracted post-layout netlist with the surrogate model, with practically no loss in accuracy

Physalis pruinosa L. var. argentina J.M.Toledo & Barboza

Cerca de Taco Ralo, viniendo desde La CochaFil: Hunziker, A. T. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentin

Physalis pruinosa var. argentina J. M. Toledo & Barboza

Camino entre Gonzalo y La Higuera, viniendo desde Hualinchay, unos 3 km antes de La HigueraFil: Hunziker, A. T. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Multidisciplinario de Biología Vegetal; Argentin