1,642 research outputs found

    Informatização do acervo da coleção entomológica da Embrapa Amazônia Oriental - CPATU.

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    A Coleção Entomológica da Embrapa Amazônia Oriental (CPATU) possui um acervo de aproximadamente 40 mil espécimes, distribuídos em varias ordens e famílias, porém menos de 10% está identificado em nível de espécie. Esse acervo representa material de pesquisa para estudantes, professores e pesquisadores, além de facilitar o atendimento de produtores que procuram a Embrapa para diagnosticar pragas e outros insetos presentes em suas lavouras. A organização do acervo em formato digital é fundamental para gerar e adaptar e/ou transferir informações para esses diversos grupos. Foram criadas planilhas com informações dos insetos preservados, assim como etiquetas com um número único para sua identificação. O banco de dados foi iniciado com a inclusão de insetos polinizadores e visitantes florais de fruteiras e espécies madeireiras, e com o tempo foram adicionados outros insetos de importância econômica. A digitalização do acervo tornará possível e fácil o acesso às informações e é o primeiro passo para a organização da informação da Coleção Entomológica

    High-performance 16-way Ku-band radial power combiner based on the TE01-circular waveguide mode

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    This work presents a 16-way Ku-band radial power combiner for high power and high frequency applications, using the very low loss TE01 circular waveguide mode. The accomplished design shows an excellent performance: the experimental prototype has a return loss better than 30 dB, with a balance for the amplitudes of ( 0.15 dB) and ( 2.5 ) for the phases, in a 16.7% fractional bandwidth (2 GHz centered at 12 GHz). For obtaining these outstanding specifications, required, for instance, in highfrequency amplification or on plasma systems, a rigorous step-by-step procedure is presented. First, a high-purity mode transducer has been designed, from the TE10 mode in the rectangular waveguide to the TE01 mode in the circularwaveguide, with very high attenuation (>50 dB) for the other propagating and evanescent modes in the circularwaveguide. This transducer has been manufactured and measured in a back-to-back configuration, validating the design process. Second, an E-plane 16-way radial power divider has been designed, where the power is coupled from the 16 non-reduced-height radial standardwaveguides into the TE01 circularwaveguide mode, improving the insertion loss response and removing the usual tapered transformers of previous designs limiting the power handling. Finally, both the transducer and the divider have been assembled to make the final radial combiner. The prototype has been carefully manufactured, showing very good agreement between the measurements and the full-wave simulationsThe authors would like to thank INMEPRE S.A., the diligence in the manufacturing process. This work was supported by the Spanish government under Grant (ADDMATE) No. TEC2016-76070-C3-1/2-R (AEI/FEDER/UE) and the program of Comunidad de Madrid S2013/ICE-3000 (SPADERADARCM

    A bibliometric review of the recent literature in ornithology

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    The number of papers published in zoology between 1978 and 1998 were 1308244, according to the Zoological Records (BIOSIS ®) and 15% of them reported studies on birds. Although the class Insecta had the largest number of papers in that period, more papers were published about mammals and birds than insects in proportion to the number of species in each taxonomic group. We found that the topics of the ornithological literature with more papers published were reproduction and breeding biology, population dynamics and biological conservation and wildlife management. The topics in ornithology with the largest increases in the number of papers were population dynamics (86%), physiology and biochemistry (79%) and predation (79%). The topics with the largest decreases were catalogues, checklists and atlases (-36%) and breeding biology (-21%). For other topics such as migration, habitat selection, behavior or parasites, diseases and disorders, the number of papers published annually between 1978 and 1998 did not change significantly. We also found that the number of authors per paper in ornithology has increased from 1.03 in 1900 to 2.19 in 1998. In addition to these results, this review shows the exciting possibilities that libraries, personal computers and bibliographic databases will offer to ornithologists.This study was funded by DGCYT project PB95-0102-CO2-01 of Ministerio de Educación y Ciencia (MEC, Spain).Peer reviewe

    USING TIME SERIES TO STUDY EFFECT OF AIR TEMPERATURE ON BODY TEMPERATURE OF COWS IN PUERTO RICO

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    Body temperature is an important measure for monitoring the health status of cows. The objective of this study is to (1) determine if a cow’s body temperature is related to ambient temperature, relative humidity, and/or temperature humidity index (THI); (2) look for signs of heat stress. The data are collected at five minute intervals during the summer months (December through February) in Puerto Rico. Regression analysis and a succession of time series analyses are conducted in time domains. Nonparametric spectral estimation and cross-spectra analysis are also performed in the frequency domain. A search for indications of heat stress is performed by characterizing the relationship between body temperature and environmental factors. Detailed approaches of regression with autocorrelated errors and transfer function model in time domain are presented, along with the comparison between two models

    Dynamical component exchange in a model phase separating system: an NMR-based approach

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    Biomolecular phase separation plays a key role in the spatial organization of cellular activities. Dynamic formation and rapid component exchange between phase separated cellular bodies and their environment are crucial for their function. Here, we employ a well-established phase separating model system, namely, a triethylamine (TEA)–water mixture, and develop an NMR approach to detect the exchange of scaffolding TEA molecules between separate phases and determine the underlying exchange rate. We further demonstrate how the advantageous NMR properties of fluorine nuclei provide access to otherwise inaccessible exchange processes of a client molecule. The developed NMR-based approach allows quantitative monitoring of the effect of regulatory factors on component exchange and facilitates “exchange”-based screening and optimization of small molecules against druggable biomolecular targets located inside condensed phases

    Aesthetic perception of photovoltaic integration within new proposals for ecological architecture

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    Architecture has become an important field of research on the mitigation of climate change. The 4literature contains a number of environmental studies of buildings conducted using the Life Cycle 5Analysis method, while others have analysed improvements in the energy efficiency. Important advances have also been made by integrating renewable energies within the building envelope. In architecture, however, it must be remembered that the formal aspect is as important as the functional one, and therefore rating the aesthetic perception of these new technologies is very interesting for future innovation projects and their integration within society. This work focuses on the aesthetic impact resulting from the use of photovoltaic systems that can be integrated within the building envelope or installed upon its surface. A survey was conducted using the Self-Assessment Manikin (SAM) to evaluate the feelings that such systems arouse, through two classic dimensions of affect: hedonic valence (pleasant-unpleasant) and arousal (activation or emotional intensity). Overall, results (error range of 5%) show that all the prototypes were rated positively and with a medium level of arousal, but those that use integrated systems obtained higher values in both dimensions of affect. Respondents’ age was observed as an influential factor in these subjective evaluations

    Aesthetic impact of solar energy systems

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    The presence of solar energy systems has increased significantly in recent years both in rural areas –in the form of solar farms–, and in urban areas as part of building installations. This transformation of the landscape, in spite of the good social acceptance of solar energy, causes an aesthetic impact whose interest has been growing in literature in recent years. This study aimed to review prior literature in order to establish the objective factors, aesthetic perception and methods that are most relevant when assessing the aesthetic impact. As a result of the lack of consensus, a new qualitative theoretical framework is proposed that can serve as a basis for future research in the field of the integration of solar energy and its aesthetic impact. The framework comprises three sub-impacts: land use, solar system energy and glare. The results are discussed for future research and innovation in building photovoltaic integration and for SES site location and its environmental impact assessments

    EU-Funded Projects with Actual Implementation of Renewable Energies in Cities. Analysis of Their Concern for Aesthetic Impact

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    Social acceptance and aesthetic impact of renewable energy (RE) in cities are topics scarcely considered in the literature even though they have attracted growing interest. Innovative Europeanfunded projects, therefore, should start to consider these concepts. This paper provides an innovative review of European projects with the aim of identifying those with actual implementation of RE and energy storage systems in urban environments and their concern for aesthetic impact. The search considered the five most relevant programs related to RE and climate change mitigation, including almost 14,000 projects. Furthermore, a survey and some interviews allowed to collect data about the selected projects. 0.1% of reviewed projects aimed at the actual installation of RE on an urban scale. However, there is a recent growing trend. The most used RE was solar, especially photovoltaic, while the most common system for energy storage was lithium batteries. We can affirm that these European projects do not currently show any particular concern for the aesthetic impact they cause in cities, nor for the social perception assessment. It would be advisable to consider technologies as products and basic components of work and daily life, and not only as a means of intervention to promote RE
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