Introductory programming courses entail students' high failure and dropout rates. In an effort to... more Introductory programming courses entail students' high failure and dropout rates. In an effort to tackle this problem, we carried out a qualitative study aiming to shed some light on the programming phase that is most challenging for students, in order to elicit the specific difficulties they experience while learning to program. In doing so, distinctive cognitive abilities, differentiating subjects in terms of the way they handle programming tasks, were detected. Such aptitudes are represented in three groups of students: those who learn easily, those who never seem to fully grasp what programming requires despite true effort, and those who experience a sudden insight, making them leap from a point were they had difficulties to another where they overcome them. By interviewing teachers and students, abstraction and sequencing elaboration were found to be the two core skills for programming. These results impelled us to consider the mental models' approach, concluding that there are very specific cognitive functions that are more favorable to learn programming and that are fostered by more adequate schemas of representing reality. Some conclusions involving Problem-based learning as a fit teaching methodology to overcome students' difficulties are also presented.
We combine searches by the CDF and D0 collaborations for a Higgs boson decaying to W+W-. The data... more We combine searches by the CDF and D0 collaborations for a Higgs boson decaying to W+W-. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb-1 of p-pbar collisions at sqrt{s}=1.96 TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard-model Higgs boson in the mass range 162-166 GeV at the 95% C.L.
We combine results from searches by the CDF and D0 collaborations for a standard model Higgs boso... more We combine results from searches by the CDF and D0 collaborations for a standard model Higgs boson (H) in the process gg->H->W+W- in p=pbar collisions at the Fermilab Tevatron Collider at sqrt{s}=1.96 TeV. With 4.8 fb-1 of integrated luminosity analyzed at CDF and 5.4 fb-1 at D0, the 95% Confidence Level upper limit on \sigma(gg->H) x B(H->W+W-) is 1.75 pb at m_H=120 GeV, 0.38 pb at m_H=165 GeV, and 0.83 pb at m_H=200 GeV. Assuming the presence of a fourth sequential generation of fermions with large masses, we exclude at the 95% Confidence Level a standard-model-like Higgs boson with a mass between 131 and 204 GeV.
As técnicas de geoprocessamento, em especial o Sensoriamento Remoto, tornaram-se corriqueiras no ... more As técnicas de geoprocessamento, em especial o Sensoriamento Remoto, tornaram-se corriqueiras no dia a dia dos profissionais que trabalham com planejamento em Unidades de Produção, principalmente aqueles que necessitam tomar decisões rápidas e precisas. Neste sentido, é importante que o técnico tenha conhecimentos mínimos necessários para poder optar por um determinado produto proveniente de um sensor, de maneira a elaborar diferentes mapas temáticos, como por exemplo o de Uso da Terra. O principal fator a ser levado em consideração é, sem dúvida, a relação custo/benefício, o que demanda, no mínimo, conhecimentos sobre as resoluções Temporal, Radiométrica, Espectral e principalmente a resolução Espacial dos diferentes sensores encontrados atualmente no mercado. Para tanto, é necessário conceituar-se as diferentes resoluções: Resolução Temporal -É a periodicidade com que um sensor obtém uma imagem de um determinado alvo; Resolução Radiométrica -É a capacidade do sensor de discriminar diferentes intensidades de sinal em que o dado se encontra registrado. Ex: 8 bits: 2 8 :256 níveis; Resolução Espectral -Consiste na capacidade de registro de dados de um sensor, dentro da região do espectro eletromagnético, sendo maior a resolução espectral quanto maior o número de bandas espectrais que o sensor é capaz de coletar; Resolução Espacial -Consiste na capacidade de um sensor em detectar os objetos a partir de determinado tamanho natural.
Introductory programming courses entail students' high failure and dropout rates. In an effort to... more Introductory programming courses entail students' high failure and dropout rates. In an effort to tackle this problem, we carried out a qualitative study aiming to shed some light on the programming phase that is most challenging for students, in order to elicit the specific difficulties they experience while learning to program. In doing so, distinctive cognitive abilities, differentiating subjects in terms of the way they handle programming tasks, were detected. Such aptitudes are represented in three groups of students: those who learn easily, those who never seem to fully grasp what programming requires despite true effort, and those who experience a sudden insight, making them leap from a point were they had difficulties to another where they overcome them. By interviewing teachers and students, abstraction and sequencing elaboration were found to be the two core skills for programming. These results impelled us to consider the mental models' approach, concluding that there are very specific cognitive functions that are more favorable to learn programming and that are fostered by more adequate schemas of representing reality. Some conclusions involving Problem-based learning as a fit teaching methodology to overcome students' difficulties are also presented.
We combine searches by the CDF and D0 collaborations for a Higgs boson decaying to W+W-. The data... more We combine searches by the CDF and D0 collaborations for a Higgs boson decaying to W+W-. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb-1 of p-pbar collisions at sqrt{s}=1.96 TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard-model Higgs boson in the mass range 162-166 GeV at the 95% C.L.
We combine results from searches by the CDF and D0 collaborations for a standard model Higgs boso... more We combine results from searches by the CDF and D0 collaborations for a standard model Higgs boson (H) in the process gg->H->W+W- in p=pbar collisions at the Fermilab Tevatron Collider at sqrt{s}=1.96 TeV. With 4.8 fb-1 of integrated luminosity analyzed at CDF and 5.4 fb-1 at D0, the 95% Confidence Level upper limit on \sigma(gg->H) x B(H->W+W-) is 1.75 pb at m_H=120 GeV, 0.38 pb at m_H=165 GeV, and 0.83 pb at m_H=200 GeV. Assuming the presence of a fourth sequential generation of fermions with large masses, we exclude at the 95% Confidence Level a standard-model-like Higgs boson with a mass between 131 and 204 GeV.
As técnicas de geoprocessamento, em especial o Sensoriamento Remoto, tornaram-se corriqueiras no ... more As técnicas de geoprocessamento, em especial o Sensoriamento Remoto, tornaram-se corriqueiras no dia a dia dos profissionais que trabalham com planejamento em Unidades de Produção, principalmente aqueles que necessitam tomar decisões rápidas e precisas. Neste sentido, é importante que o técnico tenha conhecimentos mínimos necessários para poder optar por um determinado produto proveniente de um sensor, de maneira a elaborar diferentes mapas temáticos, como por exemplo o de Uso da Terra. O principal fator a ser levado em consideração é, sem dúvida, a relação custo/benefício, o que demanda, no mínimo, conhecimentos sobre as resoluções Temporal, Radiométrica, Espectral e principalmente a resolução Espacial dos diferentes sensores encontrados atualmente no mercado. Para tanto, é necessário conceituar-se as diferentes resoluções: Resolução Temporal -É a periodicidade com que um sensor obtém uma imagem de um determinado alvo; Resolução Radiométrica -É a capacidade do sensor de discriminar diferentes intensidades de sinal em que o dado se encontra registrado. Ex: 8 bits: 2 8 :256 níveis; Resolução Espectral -Consiste na capacidade de registro de dados de um sensor, dentro da região do espectro eletromagnético, sendo maior a resolução espectral quanto maior o número de bandas espectrais que o sensor é capaz de coletar; Resolução Espacial -Consiste na capacidade de um sensor em detectar os objetos a partir de determinado tamanho natural.
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