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Search Results: 1 - 10 of 33 matches for " Biscaro "
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Co-Authorship and Bibliographic Coupling Network Effects on Citations
Claudio Biscaro, Carlo Giupponi
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0099502
Abstract: This paper analyzes the effects of the co-authorship and bibliographic coupling networks on the citations received by scientific articles. It expands prior research that limited its focus on the position of co-authors and incorporates the effects of the use of knowledge sources within articles: references. By creating a network on the basis of shared references, we propose a way to understand whether an article bridges among extant strands of literature and infer the size of its research community and its embeddedness. Thus, we map onto the article – our unit of analysis – the metrics of authors' position in the co-authorship network and of the use of knowledge on which the scientific article is grounded. Specifically, we adopt centrality measures – degree, betweenneess, and closeness centrality – in the co-authorship network and degree, betweenness centrality and clustering coefficient in the bibliographic coupling and show their influence on the citations received in first two years after the year of publication. Findings show that authors' degree positively impacts citations. Also closeness centrality has a positive effect manifested only when the giant component is relevant. Author's betweenness centrality has instead a negative effect that persists until the giant component - largest component of the network in which all nodes can be linked by a path - is relevant. Moreover, articles that draw on fragmented strands of literature tend to be cited more, whereas the size of the scientific research community and the embeddedness of the article in a cohesive cluster of literature have no effect.
Molecules and dust in Cas A: I - Synthesis in the supernova phase and processing by the reverse shock in the clumpy remnant
Chiara Biscaro,Isabelle Cherchneff
Physics , 2014, DOI: 10.1051/0004-6361/201322932
Abstract: Aims: We study the chemistry of the Type IIb supernova ejecta that led to the Cas A supernova remnant to assess the chemical type and quantity of dust that forms and evolves in the remnant phase. We later model a dense oxygen-rich ejecta knot that is crossed by the reverse shock in Cas A to study the evolution of the clump gas phase and the possibility to reform dust clusters in the post-reverse shock gas. Methods: A chemical network including all processes efficient at high gas temperatures and densities is considered. The formation of key bimolecular species (CO, SiO) and dust clusters is described. Stiff, coupled, ordinary, differential equations are solved for the conditions pertaining to both the SN ejecta and the post-reverse shock gas. Results: We find that the ejecta of Type IIb SNe are unable to form large amounts of molecules and dust clusters as opposed to their Type II-P counterparts because of their diffuse ejecta. The gas density needs to be increased by several orders of magnitude to allow the formation of dust clusters. We show that the chemical composition of the dust clusters changes drastically and gains in chemical complexity with increasing gas density. Hence, the ejecta of the Cas A supernova progenitor must have been in the form of dense clumps to account for the dust chemical composition and masses inferred from infrared observations of Cas A. We show that the ejecta molecules in a clump that is processed by the reverse shock reform in the post-reverse shock gas with lower abundances than those of the initial ejecta clump, except SiO. These molecules include CO, SiS and O2. Dust clusters are destroyed by the reverse shock and do not reform in the post-reverse shock gas, even for the highest gas density. These results indicate that the synthesis of dust grains from the gas phase in the dense knots of Cas A and in other supernova remnants is unlikely.
Molecules and dust in Cassiopeia A: II - Dust sputtering and diagnosis for dust survival in supernova remnants
Chiara Biscaro,Isabelle Cherchneff
Physics , 2015,
Abstract: We study the dust evolution in the supernova remnant Cassiopeia A. We follow the processing of dust grains formed in the Type II-b supernova by modelling the sputtering of grains located in dense ejecta clumps crossed by the reverse shock. Further sputtering in the inter-clump medium once the clumps are disrupted by the reverse shock is investigated. The dust evolution in the dense ejecta clumps of Type II-P supernovae and their remnants is also studied. We study oxygen-rich clumps that describe the ejecta oxygen core, and carbon-rich clumps that correspond to the outermost carbon-rich ejecta zone. We consider the dust components formed in the supernova, several reverse shock velocities and inter-clump gas temperatures, and derive dust grain size distributions and masses as a function of time. We find that non-thermal sputtering in clumps is important and accounts for reducing the grain population by ~ 40% to 80% in mass, depending on the clump gas over-density and the grain type and size. A Type II-b SN forms small grains that are sputtered within clumps and in the inter-clump medium. For Cas A, silicate grains do not survive thermal sputtering in the inter-clump medium. Our derived masses of currently processed silicate, alumina and carbon grains in Cas A agree well with values derived from observations. Grains in Type II-P are better survive the remnant phase. For dense ejecta clumps, dust survival efficiencies range between 42% and 98% in mass. For the SN1987A model, the derived surviving dust mass is in the range ~ 0.06-0.14 Msolar. This type of dense SNe may then be efficient dust providers to galaxies. Specifically, silicate grains over 0.1 micron and other grains over 0,05 micron survive thermal sputtering in the remnant. Therefore, pre-solar grains of SN origin possibly form in the dense ejecta clumps of Type II-P supernovae.
Satisfa??o de idosos com os aparelhos de amplifica??o sonora individual nos primeiros seis meses de uso
Laperuta, Erika Biscaro;Fiorini, Ana Claudia;
Jornal da Sociedade Brasileira de Fonoaudiologia , 2012, DOI: 10.1590/S2179-64912012000400005
Abstract: purpose: to analyze the hearing aid satisfaction after one, three and six months of use. methods: longitudinal study with 22 elderly individuals who participated in a selection and adaptation process for sound amplification devices in a high complexity health service. the study was carried out at the institution on the day of hearing aid fitting and on the follow-up appointments after one, three and six months of fitting. the data is part of the application of the satisfaction with amplification in daily life (sadl) questionnaire. in order to assess the consistency of the items composing the positive effects category of the sadl survey after one, three and six months of hearing aid use, the cronbach's coefficient alpha was used. results: there were improvements to the sadl scores in the period between the first use of the hearing aid and the following six months. cronbach's coefficient alpha was calculated excluding questions 9 and 10, simultaneously. the coefficient values were 0.75 after a month, 0.69 after three months, and 0.81 after six months. questions 9 (do you feel more confident when you use hearing aids?) and 10 (the sounds that you hear with your hearing aids are normal?) created inconsistency in the assessment after one and three months of amplification use. conclusion: the results obtained with the sadl indicate a high level of satisfaction. the averages for positive effects, negative effects, and global score were different after one, three and six months of hearing aid use.
Uso racional de medicamentos: relato de experiência no ensino médico da Unesc, Criciúma/SC
Franceschet-de-Sousa, Iane;Biscaro, Andressa;Biscaro, Fernanda;Fernandes, Marcelo Soares;
Revista Brasileira de Educa??o Médica , 2010, DOI: 10.1590/S0100-55022010000300014
Abstract: the current study aimed to disseminate the logic of rational use of medicines and its application in medical practice among medical students at unesc, santa catarina state, brazil. the study's model was the training course on rational use of medicines promoted by the world health organization (who), using the problem-based teaching-learning method, a strategy adopted by the unesc school of medicine in general. with support and funding from the office of the dean for research and the office of the dean for extension and community action (unesc), the project was developed along two lines: first, training undergraduate medical students in the logic of rational use of medicines; second, develop educational activities in the community, in neighborhoods near the university, on themes related to rational use of medicines. thirty-five students were trained, and community interventions were conducted with a total of 689 community members. the medical students involved in this project began to view prescriptions more rationally and gained a notion of the importance of prioritizing a list of essential drugs, for treatment supported by the best available evidence.
Impact of irrigation on yield and energy balance of the production of oil and cake of two sunflower varieties
Jordan, Rodrigo A.;Gomes, Eder P.;Biscaro, Guilherme A.;
Engenharia Agrícola , 2012, DOI: 10.1590/S0100-69162012000600006
Abstract: the energy balance for the production of sunflower oil and cake was carried out during the agricultural and industrial stage phase, where it was considered a cold extraction by hydraulic pressing, with the plant location in a rural area with a radius of 30km range. data on productivity was used in two varieties of sunflower (helio 358 and aguará 04) grown in different seasons (2007/2008, 2008/2009), under different irrigation levels. data showed that irrigation resulted in an increase in productivity of both varieties, and the best response was observed for aguará 04 variety. moreover, the increased intensity of irrigation negatively affected the energy balance, reducing the ratio between energy produced and energy used in the production chain. the most significant inputs in the energy intake were fertilizer followed by diesel oil, when irrigation was not used for. when the irrigation technique was used, the most significant inputs, in order of representativeness, were: energy, fertilizer and equipment.
Cor, betacaroteno e colesterol em gema de ovos obtidos de poedeiras que receberam diferentes dietas
Biscaro, Luciana Marino e;Canniatti-Brazaca, Solange Guidolin;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000600014
Abstract: egg is a nutritional complete food, and content significant quantity of nutrients. for the consumers, the food quality is related with validity date of product and with sensorial characteristics, like yolk color and hull. few studies were done in brazil about utilization of colorfull agents and theirs effects in yolk color and chemical quality of egg compounds. the objective of this research was related different feeds with the color, beta-carotene and cholesterol amount of egg yolk. eggs were caught of laying hens that received 4 feed types. the color measure was done by minolta colorimeter, beta-carotene separated by column and spectrophotometer and cholesterol separated with chloroform and measured by colorimetric method. the results showed that there is not a relation between the color an increase of beta-carotene amount in the yolks, but feed altered the yolk color. cholesterol amount was different (p<0,05) between treatments 1 and 3. the different feeds of laying hens altered color, but it did not relate with beta-carotene. the cholesterol in the yolk altered too.
Utiliza??o de modelos de programa??o n?o-linear para sistematiza??o de terras para irriga??o em áreas regulares
Saad, Jo?o Carlos Cury;Biscaro, Guilherme Augusto;
Ciência e Agrotecnologia , 2007, DOI: 10.1590/S1413-70542007000500045
Abstract: the present investigation aimed at the development of nonlinear programming models applicable to regularly shaped areas, intended to minimize the impact of soil manipulation. software gams was used for calculation and two models were compared to the method of generalized minimum squares, developed by scaloppi & willardson (1986). the evoluation parameter was the volume of soil manipulated. the study concluded that both nonlinear programming models developed during the present investigation have shown to be appropriate to practical use in regulary shaped areas. moreover, the models presented lower volume of soil manipulated when compared to the method of generalized minimum squares.
Observations of tropical rain with a polarimetric X-band radar: first results from the CHUVA campaign
M. Schneebeli,J. Sakuragi,T. Biscaro,C. F. Angelis
Atmospheric Measurement Techniques Discussions , 2012, DOI: 10.5194/amtd-5-1717-2012
Abstract: A polarimetric X-band radar has been deployed during one month (April 2011) for a field campaign in Fortaleza, Brazil, together with additional sensors like a Ka-band vertically pointing frequency modulated continuous wave (FMCW) radar and three laser disdrometers. The disdrometers as well as the FMCW radar are capable of measuring the rain drop size distributions (DSDs), hence making it possible to forward-model theoretical polarimetric X-band radar observables at the point where the instruments are located. This set-up allows to thoroughly test the accuracy of the X-band radar measurements as well as the algorithms that are used to correct the radar data for radome and rain attenuation. In the first campaign in Fortaleza it was found that radome attenuation dominantly affects the measurements. With an algorithm that is based on the self-consistency of the polarimetric observables, the radome induced reflectivity offset was estimated. Offset corrected measurements were then further corrected for rain attenuation with two different schemes. The performance of the post-processing steps is being analyzed by comparing the data with disdrometer-inferred polarimetric variables that were measured in a distance of 20 km to the radar.
Impact of irrigation on yield and energy balance of the production of oil and cake of two sunflower varieties Impacto da irriga o na produtividade e no balan o energético da produ o de óleo e torta de duas variedades de girassol
Rodrigo A. Jordan,Eder P. Gomes,Guilherme A. Biscaro
Engenharia Agrícola , 2012,
Abstract: The energy balance for the production of sunflower oil and cake was carried out during the agricultural and industrial stage phase, where it was considered a cold extraction by hydraulic pressing, with the plant location in a rural area with a radius of 30km range. Data on productivity was used in two varieties of sunflower (Helio 358 and Aguará 04) grown in different seasons (2007/2008, 2008/2009), under different irrigation levels. Data showed that irrigation resulted in an increase in productivity of both varieties, and the best response was observed for Aguará 04 variety. Moreover, the increased intensity of irrigation negatively affected the energy balance, reducing the ratio between energy produced and energy used in the production chain. The most significant inputs in the energy intake were fertilizer followed by diesel oil, when irrigation was not used for. When the irrigation technique was used, the most significant inputs, in order of representativeness, were: energy, fertilizer and equipment. Realizou-se o balan o energético para a produ o de óleo e torta de girassol na fase agrícola e na fase de extra o a frio por prensagem hidráulica, com a localiza o da usina em área rural, num raio de abrangência de 30km. Foram utilizados dados de produtividade de duas variedades de girassol (Helio 358 e Aguará 04) cultivadas em safras distintas (2007/2008, 2008/2009), submetidas a diferentes laminas de irriga o. Os dados mostraram que a irriga o propiciou aumento de produtividade das duas variedades, sendo que a melhor resposta foi observada para a variedade Aguará 04. Por outro lado, o aumento da intensidade de irriga o afetou negativamente o balan o energético, reduzindo a rela o entre energia extraída e energia utilizada na cadeia de produ o. Os insumos mais representativos nas entradas de energia foram os fertilizantes, seguidos pelo óleo diesel, quando n o se utilizou de irriga o. Quando utilizada a técnica de irriga o, os insumos mais significativos, em ordem de representatividade, foram: energia elétrica, fertilizantes e equipamentos.
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