O uso de mapas conceituais para avaliar a mudança conceitual de alunos do ensino médio sobre o tema corrente elétrica: um estudo de caso

Os objetivos deste trabalho foram elaborar uma seqüência de ensino sobre o tema corrente elétrica e usar mapas conceituais (MCs) para avaliar a mudança de complexidade do aspecto cognitivo de quatro alunos do ensino médio de uma escola pública estadual, que participaram do programa de Pré-Iniciação Científica (PIC) da Pró-Reitoria de Pesquisa da Universidade de São Paulo. Durante cinco meses, os estudantes realizaram atividades na universidade, como pesquisas do tema em fontes bibliográficas, elaboraram seminários sobre a temática, tiveram quinze aulas teóricas e cinco experimentais sobre eletricidade. A análise dos resultados revelou que os alunos, após as seqüências de ensino, foram capazes de construir proposições significativas baseadas nos conceitos abordados nas aulas e pelos mapas foi possível verificar uma mudança significativa dos alunos em relação ao tema corrente elétrica.The purposes of this work were to elaborate a teaching sequence on the theme “electric currents” and employ concept maps (CMs) to assess the variation in cognitive complexity of four students from a secondary public school, who participated in the Pre-Undergraduate Research Program (PIC – Pré-Iniciação Científica) of the University of São Paulo Research Pro-Rectory. For the period of five months, these students took part in activities conducted at the college facilities, such as bibliographical research, elaboration of seminars on the theme and they also attended fifteen theoretical lectures and five experimental classes on electricity. Analysis of the results revealed that, following the teaching sequence, the students were able to formulate meaningful propositions based on the concepts approached in class and through the maps; it was possible to verify a significant improvement in the students’ knowledge of the theme “electric current”

Catalog of Isolated Galaxies Selected from the 2MASS Survey

We search for isolated galaxies based on the automatic identification of isolated sources from the Two Micron All-Sky Survey (2MASS) followed by a visual inspection of their surroundings. We use the modified Karachentseva criterion to compile a catalog of 3227 isolated galaxies (2MIG), which contains 6% of 2MASS Extended Sources Catalog (or 2MASX) sources brighter than Ks = 12 mag with angular diameters a_K > 30 arcsec. The catalog covers the entire sky and has an effective depth of z = 0.02. The 2493 very isolated objects of the catalog, which we include into the 2MVIG catalog, can be used as a reference sample to investigate the effects of the environment on the structure and evolution of galaxies located in regions with extremely low density of matter.Comment: 19 pages, 13 figure

Orchestration of Network Services Across Multiple Operators: The 5G Exchange Prototype

Future 5G networks will rely on the coordinated allocation of compute, storage, and networking resources in order to meet the functional requirements of 5G services as well as guaranteeing efficient usage of the network infrastructure. However, the 5G service provisioning paradigm will also require a unified infrastructure service market that integrates multiple operators and technologies. The 5G Exchange (5GEx) project, building heavily on the Software-Defined Network (SDN) and the Network Function Virtualization (NFV) functionalities, tries to overcome this market and technology fragmentation by designing, implementing, and testing a multi-domain orchestrator (MdO) prototype for fast and automated Network Service (NS) provisioning over multiple-technologies and spanning across multiple operators. This paper presents a first implementation of the 5GEx MdO prototype obtained by extending existing open source software tools at the disposal of the 5GEx partners. The main functions of the 5GEx MdO prototype are showcased by demonstrating how it is possible to create and deploy NSs in the context of a Slice as a Service (SlaaS) use-case, based on a multi-operator scenario. The 5GEx MdO prototype performance is experimentally evaluated running validation tests within the 5GEx sandbox. The overall time required for the NS deployment has been evaluated considering NSs deployed across two operators

Chemical weed control in areas of no-till cassava

O objetivo do trabalho foi avaliar a seletividade para a cultura da mandioca e o comportamento de vários herbicidas, aplicados em pré e pós-emergência, no controle das plantas daninhas Avena sativa, Bidens pilosa, Commelina benghalensis, Raphanus sativus e Sida rhombifolia. O experimento foi conduzido em área de plantio direto, em Araruna, noroeste do Paraná. Embora alguns herbicidas avaliados tenham se destacado em relação ao controle de uma ou mais das espécies de plantas daninhas e outros tenham demonstrado seletividade para a mandioca, os melhores resultados foram obtidos, considerando- se tanto a seletividade quanto a eficácia, com as misturas arnetryne+clornazone (1,50+1,00 kg/ha) e arnetryne+diuron (0,62+0,96 kg/ha), ambas aplicadas em pós-emergência das plantas daninhas e quando a mandioca encontrava-se com 5 a 10% de brotações emergidas. The aim of this work was to evaluate the selectivity of some pre and postemergence herbicides on cassava, as well as their efficiency to control the weeds Avena sativa, Bidens pilosa, Commelina benghalensis, Raphanus sativus and Sida rhombifolia. The field trial was carried out in no-till areas, in Araruna, northwestern Paraná State. Although some herbicides provided outstanding results either in relation to weed control or crop selectivity, when both aspects were taken into consideration, the best results were achieved with arnetryne-i-clornazone (1.50+ 1.00 kg/ha) and ametryne--diuron (0.62+0.96 kg/ha), both applied postemergence of weeds, when 5 to 10% of cassava sprouts had already emerged from the soil

Desempenho de Ovinos Pantaneiros oriundos da fazenda Nhumirim- Embrapa Pantanal, Corumbá- MS.

Evinci 2022

Pelagens e suas variedades em cavalos pantaneiros da Embrapa Pantanal.

O estudo dessas informações, que ajudam a compreender como e quando ocorre o fluxo de pescadores, pode contribuir para a gestão da pesca amadora na bacia, bem como para o planejamento das atividades pelos empresários do setor turístico pesqueiro