177,333 research outputs found
The evolution of extracellular hemoglobins of annelids, vestimentiferans, and pogonophorans.
No full textThe evolution of extracellular hemoglobins of annelids, vestimentiferans, and pogonophorans was investigated by applying cladistic and distance-based approaches to reconstruct the phylogenetic relationships of this group of respiratory pigments. We performed this study using the aligned sequences of globin and linker chains that are the constituents of these complex molecules. Three novel globin and two novel linker chains of Sabella spallanzanii described in an accompanying paper (Pallavicini, A., Negrisolo, E., Barbato, R., Dewilde, S., Ghiretti-Magaldi, A., Moens, L., and Lanfranchi, G. (2001) J. Biol. Chem. 276, 26384--26390) were also included. Our results allowed us to test previous hypotheses on the evolutionary pathways of these proteins and to formulate a new most parsimonious model of molecular evolution. According to this novel model, the genes coding for the polypeptides forming these composite molecules were already present in the common ancestor of annelids, vestimentiferans, and pogonophorans
Structural Performance-Based Design Optimisation of a Secondary Mirror for a Concentrated Solar Power (CSP) Plant
No full textConcentrated Solar Power (CSP) plants use mirrors to reflect and concentrate sunlight onto a receiver, to heat a fluid and store thermal energy, at high temperature and energy density, to produce dispatchable heat and/or electricity. The secondary mirror is a critical component in the optical system of certain Solar Power Tower plants (SPT), as it redirects the concentrated sunlight from the primary mirror onto the receiver, which can be arranged at ground level. In this study, we propose a design optimisation for the secondary mirror of a CSP plant. The design optimisation method consists of two steps. The first step involves the use of the finite element simulation software Abaqus 2022 to analyse the structural performance of the secondary mirror under thermal loads and wind. The second step consists of the use of simulation results to identify the combination of design parameters and best performances, with respect to both design constraints and structural safety. This is carried out by developing an algorithm that selects those configurations which satisfy the constraints by using safety coefficients. The proposed optimisation method is applied to the design of a potential configuration of a secondary mirror for the beam-down of the CSP Magaldi STEM® technology, although the methodology can be extended to other components of CSP plants, such as primary mirrors and receivers, to further enhance the structural performance of these systems
The Evolution of Extracellular Hemoglobins of Annelids, Vestimentiferans, and Pogonophorans.
No full textThe evolution of extracellular hemoglobins of annelids, vestimentiferans, and pogonophorans was investigated by applying cladistic and distance-based approaches to reconstruct the phylogenetic relationships of this group of respiratory pigments. We performed this study using the aligned sequences of globin and linker chains that are the constituents of these complex molecules. Three novel globin and two novel linker chains of Sabella spallanzanii described in an accompanying paper (Pallavicini, A., Negrisolo, E., Barbato, R., Dewilde, S., Ghiretti-Magaldi, A., Moens, L., and Lanfranchi, G. (2001) J. Biol. Chem. 276, 26384--26390) were also included. Our results allowed us to test previous hypotheses on the evolutionary pathways of these proteins and to formulate a new most parsimonious model of molecular evolution. According to this novel model, the genes coding for the polypeptides forming these composite molecules were already present in the common ancestor of annelids, vestimentiferans, and pogonophorans
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
INTEGRATED SYSTEM FOR RE-ACTIVATION AND RE-CIRCULATION OF LIGHT ASHES HAVING A HIGH CONTENT OF UNBURNT MATTER
No full textTHE PRESENT INVENTION RELATES TO A TREATMENT FOR REACTIVATING LIGHT ASHES, OBTAINED FROM THE COMBUSTION OF FOSSIL FUELS OR FROM THE CO-COMBUSTION THEREWITH CDR OR BIOMASSES INSIDE DUST PHASE BOILERS
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Nelson Rodrigues e sua cena: teatro da dupla tensão, cinema da síntese
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão. Programa de Pós-graduação em LiteraturaEsta tese busca uma leitura possível das razões do fracasso de grande parte das adaptações da dramaturgia de Nelson Rodrigues para o cinema. Sua primeira investida percorre o teatro rodrigueano, elaborando o conceito de dupla tensão como marca do autor. A primeira tensão, articulada ainda nos domínios temáticos, responderia pelo embate firmado entre o Brasil anterior à gripe-espanhola e os "novos tempos", dominados por uma modernidade produtora de tripla decadência, como pensa Eric Hobsbawm. A segunda tensão, insinuada nos domínios estéticos, promoveria certo afastamento do conceito de drama puro, segundo teoria de Peter Szondi, ao se deixar contaminar por gêneros diversos, posicionando-se entre o melodramático e o trágico. Neste contexto, Toda nudez será castigada, peça de 1965, seria o ponto mais alto desta trajetória. Tal conformação, perseguida em todo o teatro do autor, não parece ter encontrado eco nas releituras do cinema, quase todas reducionistas do universo tensional. A única experiência de exceção parece acontecer na versão de Arnaldo Jabor justamente para Toda nudez será castigada, filme de 1973 que transforma em ritmo próprio as tensões típicas da dramaturgia rodrigueana, movimento contrário às outras versões, que tentaram corrigi-las com sínteses nas mais variadas proposições
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