Study of AC losses in medium-sized high temperature superconducting coils

The study of AC losses in superconducting pancake coils is of utmost importance for the development of superconducting devices. Due to different technical difficulties this study is usually performed considering one of two approaches: considering superconducting coils of few turns and studying AC losses in a large frequency range vs. superconducting coils with a large number of turns but measuring AC losses only in low frequencies. In this work, a study of AC losses in 128 turn superconducting coils is performed, considering frequencies ranging from 50 Hz till 1152 Hz and currents ranging from zero till the critical current of the coils. Moreover, the study of AC losses considering two different simultaneous harmonic components is also performed and results are compared to the behaviour presented by the coils when operating in a single frequency regime. Different electrical methods are used to verify the total amount of AC losses in the coil and a simple calorimetric method is presented, in order to measure AC losses in a multi-harmonic context. Different analytical and numerical methods are implemented and/or used, to design the superconducting coils and to compute the total amount of AC losses in the superconducting system and a comparison is performed to verify the advantages and drawbacks of each method.

Caracterização e avaliação produtiva de uma população nativa de pimenta longa (Piper hispidinervum C.DC) no Seringal Cachoeira, AC, Brasil

A busca de alternativas econômicas ao extrativismo tradicional na Amazônia é importante e a exploração de populações naturais de plantas da família Piperaceae, abundantes no Acre, pode se constituir em uma atividade rentável. O objetivo deste trabalho foi determinar algumas características demográficas, ecológicas e produtivas da espécie pimenta longa (Piper hispidinervum C.DC) e avaliar a possibilidade de seu manejo para a produção de óleo essencial com alto teor de safrol. O estudo foi desenvolvido no Projeto de Assentamento Extrativista Chico Mendes, em Xapuri, AC, em uma área de capoeira com aproximadamente dez anos, onde a pimenta longa era dominante. A população foi avaliada por meio de amostragem aleatória simples, com intensidade de 12%, tendo como unidades amostrais parcelas de 10 χ 10 m. Constatou-se uma densidade média de 15 indivíduos/100 m2, variando de zero a 71 indivíduos. Esta população apresentou uma média de 92% de teor de safrol no óleo essencial, com CV de 2,38%. O rendimento médio de óleo da biomassa seca, foi de 3,5%, com CV de 28,57%. A produção de óleo foi estimada em 12,11 kg/ha, com um corte por ano, que representa apenas 15,1% da produtividade obtida em áreas de cultivo. Portanto, a viabilidade da exploração dessas populações depende do desenvolvimento de técnicas que permitam aumentar a densidade de indivíduos. Ademais, na escolha de populações para o manejo, deve-se considerar características como: tamanho, densidade e idade da população.

Updating of the hierarchical rock mass rating (HRMR) system and a new subsystem developed for weathered granite formations

The RMR system is still very much applied in rock mechanics engineering context. It is based on the evaluation of six weights to obtain a final rating. To obtain the final rating a considerable amount of information is needed concerning the rock mass which can be difficult to obtain in some projects or project stages at least with accuracy. In 2007 an alternative classification scheme based on the RMR, the Hierarchical Rock Mass Rating (HRMR) was presented. The main feature of this system was the adaptation to the level of knowledge existent about the rock mass to obtain the classification of the rock mass since it followed a decision tree approach. However, the HRMR was only valid for hard rock granites with low fracturing degrees. In this work, the database was enlarged with approximately 40% more cases considering other types of granite rock masses including weathered granites and based on this increased database the system was updated. Granite formations existent in the north of Portugal including Porto city are predominantly granites. Some years ago a light rail infrastructure was built in the city of Porto and surrounding municipalities whi h involved considerable challenges due to the high heterogeneity levels of the granite formations and the difficulties involved in their geomechanical characterization. In this work it is intended to provide also a contribution to improve the characterization of these formations with special emphasis to the weathered horizons. A specific subsystem applicable to the weathered formations was developed. The results of the validation of these systems are presented and show acceptable performances in identifying the correct class using less information than with the RMR system.

A new empirical system for rock slope stability analysis in exploitation stage

An empirical system was developed to obtain a quality index for rock slopes in road infrastructures, named Slope Quality Index (SQI), and it was applied to a set of real slopes.The SQI is supported in nine factors affecting slope stability that contemplate the evaluation of different parameters. Consequently, each factor is classified by the degree of importance and influence by assigned weights. These weights were established through a statistical analysis of replies to a survey that was distributed to several experienced professionals in the field. The proposed SQI varies between1 and 5, corresponding to slopes in very good and very bad condition state, respectively. Besides the advantage linked to a quantitative and qualitative evaluation of slopes, theSQI also allows identifying the most critical factors on the slope stability, which is a fundamental issue for an efficient management of the slope network in the road infrastructure, namely in the planning of conservation and maintenance operations.

SQI – A quality assessment index for rock slopes

In this work, an empirical system was developed to obtain a quality index for rock slopes in road infrastructures, named Slope Quality Index (SQI), and it was applied to a set of real slopes. The SQI is supported in nine factors affecting slope stability that contemplate the evaluation of different parameters. Consequently, each factor is classified by degree of importance and influence by assigned weights. These weights were established through a statistical analysis of replies to a survey that was distributed to several experienced professionals in the field. The proposed SQI varies between 1 and 5, corresponding to slopes in very good and very bad condition state, respectively. Besides the advantage linked to a quantitative and qualitative evaluation of slopes, the SQI also allows identifying the most critical factors on the slope stability, which is a fundamental issue for an efficient management of the slope network in the road infrastructure, namely in the planning of conservation and maintenance operations.

Termos psicopatológicos em bandas e músicas de rock and roll

OBJETIVO: Investigar o uso de termos psicopatológicos nos nomes de bandas de rock and roll e em suas músicas. MÉTODO: Termos psicopatológicos do glossário do DSM-IV foram digitados em português e inglês na página do YouTube. Bandas e músicas de rock and roll foram identificadas. O mesmo procedimento foi realizado, a título de comparação, com o glossário de termos neurológicos da CID-10. RESULTADOS: Foram encontrados nomes de bandas ou músicas referentes a 62 termos psiquiátricos e a 24 termos neurológicos. Os termos psiquiátricos foram mais frequentes, apresentando diferença estatisticamente significativa. Foram encontradas 60 bandas de rock com nomes inspirados na psiquiatria e na neurologia. Dessas, 44 bandas usavam nomes psiquiátricos e 16 bandas usavam termos neurológicos. Bandas e músicas de rock usam mais nomes psiquiátricos que neurológicos. Predominaram nas músicas nomes relacionados ao uso de substâncias. Ao se compararem nomes de bandas e canções brasileiras e estrangeiras, não se encontrou diferença estatisticamente significativa. CONCLUSÃO: Bandas de rock and roll usam com maior frequência termos psicopatológicos em seus nomes e em suas músicas. Bandas brasileiras apresentam resultados semelhantes.

Nova genera ac species plantarum, quas in regno Chilensi Peruviano et in terra Amazonica :annis MDCCCXXVII ad MDCCCXXXII /legit Eduardus Poeppig et cum Stephano Endlicher descripsit iconibusque illustravit.

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Nova genera ac species plantarum, quas in regno Chilensi Peruviano et in terra Amazonica :annis MDCCCXXVII ad MDCCCXXXII /legit Eduardus Poeppig et cum Stephano Endlicher descripsit iconibusque illustravit.

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Nova genera ac species plantarum, quas in regno Chilensi Peruviano et in terra Amazonica :annis MDCCCXXVII ad MDCCCXXXII /legit Eduardus Poeppig et cum Stephano Endlicher descripsit iconibusque illustravit.

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Florae Austriacae, sive, Plantarum selectarum in Austriae archiducatu :sponte crescentium icones, ad vivum coloratae, et descriptionibus, ac synonymis illustratae /opera et sumptibus Nicolai Josephi Jacquin.

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Florae Austriacae, sive, Plantarum selectarum in Austriae archiducatu :sponte crescentium icones, ad vivum coloratae, et descriptionibus, ac synonymis illustratae /opera et sumptibus Nicolai Josephi Jacquin.

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Florae Austriacae, sive, Plantarum selectarum in Austriae archiducatu :sponte crescentium icones, ad vivum coloratae, et descriptionibus, ac synonymis illustratae /opera et sumptibus Nicolai Josephi Jacquin.

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Florae Austriacae, sive, Plantarum selectarum in Austriae archiducatu :sponte crescentium icones, ad vivum coloratae, et descriptionibus, ac synonymis illustratae /opera et sumptibus Nicolai Josephi Jacquin.

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Florae Austriacae, sive, Plantarum selectarum in Austriae archiducatu :sponte crescentium icones, ad vivum coloratae, et descriptionibus, ac synonymis illustratae /opera et sumptibus Nicolai Josephi Jacquin.

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Herbarium amboinense : plurimas conplectens arbores, frutices, herbas, plantas terrestres & aquaticas, quae in Amboina et adjacentibus reperiuntur insulis adcuratissime descriptas iuxta earum formas, cum diuersis denominationibus cultura, usu, ac virtutibus, quod & insuper exhibet varia insectorum animaliumque genera, plurima cum naturalibus eorum figuris depicta /

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