306,693 research outputs found
Um Olhar Atento à Paisagem: Entrevista com Dora Shellard Corrêa
No full textInterview with Dora Shellard Corrêa, adjunct professor in the History course at the State University of Londrina, has been building a work of unavoidable reference when the subject is the historical analysis of landscapes. Since his doctoral thesis, published in a book entitled Paisagens sobrepostas: Índios, posseiros e fazendeiros nas matas de Itapeva (1923-1930), landscape has been her privileged research topic.
Entrevista com Dora Shellard Corrêa, professora adjunta do curso de História da Universidade Estadual de Londrina (UEL), que vê a construção de uma obra de referência incontroversa quando o assunto é análise histórica de paisagens. Desde sua tese de doutorado, publicada no livro sob o título Paisagens sobrepostas: Índios, posseiros e fazendeiros nas matas de Itapeva (1923-1930), a paisagem tem sido seu objeto privilegiado de pesquisa. Entrevista realizada com Dora Shellard Corrêa, professora adjunta do curso de História da Universidade Estadual de Londrina (UEL), que vê a construção de uma obra de referência incontroversa quando o assunto é análise histórica de paisagens. Desde sua tese de doutorado, publicada em livro sob o título Paisagens sobrepostas: Índios, posseiros e fazendeiros nas matas de Itapeva (1923-1930), a paisagem tem sido seu objeto privilegiado de pesquisa.
The relationship between thin-layer chromatographic behaviour and the stereochemistry of some heteroyohimbine alkaloids
No full textAbstract
ANUMBER of thin-layer chromatography systems have been used to distinguish and identify some indole and oxindole alkaloids isolated from various species of the genus Mitragyna (Shellard & Phillipson, 1964). It has been suggested moreover that a relationship exists between the stereochemistry of these alkaloids and their behaviour on thin-layer chromatograms (Phillipson & Shellard, 1966). Two new heteroyohimbine alkaloids, mitrajavine and hirsutine, have recently been isolated from Mitragyna species (Shellard, Beckett, Tantivatana, Phillipson & Lee, 1966) and their behaviour on thin-layers has been compared with some related alkaloids of known stereochemistry. Based on this, certain suggestions have been made about the stereochemistry of these two new alkaloids.</jats:p
Cent cinquante ans de pharmacognosie en Angleterre : E. J. Shellard, A history of british pharmacognosy 1842-1980
No full textDelaveau Pierre. Cent cinquante ans de pharmacognosie en Angleterre : E. J. Shellard, A history of british pharmacognosy 1842-1980. In: Revue d'histoire de la pharmacie, 72ᵉ année, n°263, 1984. pp. 444-445
Cent cinquante ans de pharmacognosie en Angleterre : E. J. Shellard, A history of british pharmacognosy 1842-1980
No full textDelaveau Pierre. Cent cinquante ans de pharmacognosie en Angleterre : E. J. Shellard, A history of british pharmacognosy 1842-1980. In: Revue d'histoire de la pharmacie, 72ᵉ année, n°263, 1984. pp. 444-445
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mecanismo de redução de emissões por desmatamento e degradação florestal em países em desenvolvimento (REDD) e sua aplicação no caso brasileiro.
No full textAborda as estratégias que vêm sendo delineadas para o setor florestal no âmbito do tratado internacional do clima ? em especial a questão da inserção da conservação florestal nas estratégias de mitigação ?, e como as soluções passíveis de ser adotadas poderão alterar cenários futuros da paisagem no Brasil
Les femmes et la recherche pharmaceutique en Grande-Bretagne : E. J. Shellard, Some early women research workers in british pharmacy 1886-1912
No full textLes femmes et la recherche pharmaceutique en Grande-Bretagne : E. J. Shellard, Some early women research workers in british pharmacy 1886-1912. In: Revue d'histoire de la pharmacie, 71ᵉ année, n°258, 1983. p. 250
General CMB and primordial bispectrum estimation: Mode expansion, map making, and measures of F_{NL}
No full textWe present a detailed implementation of two parallel bispectrum estimation methods which can be applied to general nonseparable primordial and cosmic microwave background (CMB) bispectra. The method exploits bispectrum mode decompositions on the tetrahedral domain of allowed wave number or multipole values, using both separable basis functions and related orthonormal modes. We provide concrete examples of such modes constructed from symmetrized tetrahedral polynomials, demonstrating the rapid convergence of expansions describing nonseparable bispectra. We use these modes to create rapid and robust pipelines for generating simulated CMB maps of high resolution (l>2000) given an arbitrary primordial power spectrum and bispectrum or an arbitrary late-time CMB angular power spectrum and bispectrum. By extracting coefficients for the same separable basis functions from an observational map, we are able to present an efficient fNL estimator for a given theoretical model with a nonseparable bispectrum. The estimator has two manifestations, comparing the theoretical and observed coefficients at either primordial or late times, thus encompassing a wider range of models, including secondary anisotropies and lensing as well as active models, such as cosmic strings. We provide examples and validation of both fNL estimation methods by direct comparison with simulations in a WMAP-realistic context. In addition, we demonstrate how the full primordial and CMB bispectrum can be extracted from observational maps using these mode expansions, irrespective of the theoretical model under study. We also propose a universal definition of the bispectrum parameter FNL, so that the integrated bispectrum on the observational domain can be more consistently compared between theoretical models. We obtain WMAP5 estimates of fNL for the equilateral model from both our primordial and late-time estimators which are consistent with each other, as well as results already published in the literature. These general bispectrum estimation methods should prove useful for non-Gaussianity analysis with the Planck satellite data, as well as in other contexts
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The instanton liquid and the axion
No full textThe ultimate goal of this thesis is to improve our understanding of the cosmology of axions. Axions couple to QCD
instantons and these non-perturbative effects are modeled within the framework of the interacting instanton liquid model (IILM). The thesis describes the significant advances made within the IILM in order to study the quark-gluon plasma in realistic parameter regimes. In particular, a determination of the temperature-dependent axion mass in the IILM lays the foundation for a critical reevaluation and update of present cosmological axion constraints.
We develop grand canonical Monte Carlo routines to study topological fluctuations in the quark-gluon plasma. The model is calibrated against the topological susceptibility at zero temperature, in the chiral regime of physical quark masses. A numerical framework to derive interactions among the pseudo-particles is developed that is in principle exact, and is used to cure a pathology in the presently available finite temperature interactions.
The IILM reduces field theory to a molecular dynamics description, and we show that, quite generically, the dynamics for non-trivial backgrounds in the presence of light quarks is reminiscent of a strongly associating fluid. To deal with the well-known difficulty in simulating ionic fluids, we develop advanced algorithms based on Biased Monte Carlo techniques.
We study the IILM at finite temperature in the quenched and unquenched sector, with due diligence to a consistent thermodynamic limit. Of particular interest is chiral symmetry breaking and the temperature dependence of the topological susceptibility, and we study in detail the effects of instanton--anti-instanton pairs. Our determination of the topological susceptibility provides, for the first time, a well-motivated axion mass for all temperatures.
The misalignment mechanism for axion production is studied in detail, solving the evolution equations exactly in a radiation dominated FRW universe with the full temperature dependence of the effective degrees of freedom taken into account. Improved constraints in the classic and anthropic axion window are derived. We generalise the latter to large angle fine-tuning by including in the isocurvature contribution to the cosmic microwave background radiation the full anharmonic axion potential effects. Finally, we reexamine bounds from axion string radiation in the thermal scenario to complete a comprehensive update of all cosmological axion constraints
Les femmes et la recherche pharmaceutique en Grande-Bretagne : E. J. Shellard, Some early women research workers in british pharmacy 1886-1912
No full textLes femmes et la recherche pharmaceutique en Grande-Bretagne : E. J. Shellard, Some early women research workers in british pharmacy 1886-1912. In: Revue d'histoire de la pharmacie, 71ᵉ année, n°258, 1983. p. 250
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