Comment on ``Casimir force in compact non-commutative extra dimensions and radius stabilization''

We call attention to a series of mistakes in a paper by S. Nam [JHEP 10 (2000) 044, hep-th/0008083].Comment: 6 pages, LaTeX, uses JHEP.cl

Ludicidade na educação ambiental : contribuição na percepção crítica de problemas socioambientais

O presente artigo é parte de uma pesquisa de mestrado em Ensino de Ciências, com enfoque na Educação Ambiental Crítica, em parceria com a Fundação Jardim Zoológico de Brasília (FJZB). A pesquisa, de intervenção pedagógica, idealizou uma metodologia lúdica em formato de gincana, intitulada Gincana Ambiental, que foi aplicada numa escola pública na capital do Brasil. Foram construídas provas-desafios com objetivos específicos de modo a preparar criticamente o aluno sobre contexto socioambiental do córrego Guará. O resultado demonstrou que, por meio da gincana, os alunos compreenderam os problemas e entrelaçamentos que afetam o córrego, analisaram suas causas e indicaram soluções de modo a mitigarem os problemas. Dessa forma, a ludicidade se apresentou como importante contributo metodológico para práticas de Educação Ambiental

A criação de um recurso didático e a aplicação das taxonomias de Bloom como avaliação da aprendizagem: Relatos de sala de aula

Anais do 3° Encontro Nacional de Jogos e Atividades Lúdicas no Ensino de Química, Física e Biologia (Jalequim - Level III) - Núcleo de Desenvolvimento de Pesquisas em Ensino de Química/Ciências da UNILA (NuDDEQ)A utilização dos jogos e atividades lúdicas torna - se cada vez mais presente no contexto escolar e em pesquisas acadêmicas . e ntretanto , há poucas discussões sobre a utilização de ferramentas que auxiliam na análise geral do jogo . a ssim , além deste trabalho propor um jogo a ser utilizado no ensino de q uímica , faz uso das taxonomias de b loom como método de avaliação dos conteúdos acadêmicos que são inerentes da atividade

Reducing Cognitive Load of Unmanned Aerial Vehicle Soldier-Operators: A Novel Weapon-UAV Control Design

poster abstractDuring armed conflict, unexpected events are routinely encountered owing to the lack of battlefield information. This condition is heightened when fireteams (3-4-soldiers) on patrol are dependent on information-communication from unmanned-aerial-vehicle (UAV) operators, miles away within a safe zone. In this scenario, communications from operators to the fireteam is time consuming, i.e., fireteams must remain unengaged and waiting for central-control information. Consequences from this battlefield configuration include potential time loss from possible evasive action and communication breakdown through compromised telecommunications. This all adds to soldier anxiety and cognitive load. Research suggests that incongruity between fireteam expectations and battlefield conditions erode the interpretation of events, leading to further degradation of effective decision-making during armed conflict or reconnaissance. In response to this problem we investigated how to improve soldier reconnaissance activities through a novel Situational-Aware UAV-Riflei System (SURS)—an integrated technology that gives the fireteam soldier-user autonomous control of the UAV with no constriction to accessing the firearm controls. Six participants, with varying degrees of experience with flying or using UAV interface controls were recruited for this study. A usability test comparing SURS with standard UAV controls focused on time-on-task and error-rate, as well as ease-of-use. Using the baseline results of the standard control interface from the UAV manufacturer, was it possible to demonstrate a significant improvement using SURS to execute complex UAV maneuver-agility tasks? The SURS system achieved positive usability results in performance and control capabilities. A comparative analysis of task speed and errors indicated a faster learning curve for the embedded SURS control interface, with a decrease in error by 30%. Besides performance benefits, an observed change in user-awareness levels (without performance loss), represents an optimum battlefield alternative for embedded controls. For our technology design we used a blue-orange Nurf-Gun in the place of a real Army regulation rifle

A Formação Inicial e Continuada dos Professores de Química: Uma Análise do Quadro Docente de Barreiras – Bahia

This paper analyzes the initial and continued formation the teaching staff of chemistry in High School of the public network of Barreiras-BA, for to know the yours main training needs. By questionnaires applied in the twelve state schools was possible to get necessary information for to trace the profile these professionals of basic education. The data analysis showed the training needs these professors and that they are related, mainly, to absence of didactic and pedagogical formation in their initial formation and also the deficiency of specific knowledge generated by an inadequate formation for the teaching function in the chemistry teaching. The results show yet that more than half these professors do not have graduation degree complete and they are not permanent teaching staff, showing the need of professionals in this area. Discussions about continued formation show that most chemistry professors do not has interest to make improvement and/or specialization for chemistry teaching, factor that favors the devaluation of the teacher in the society and shows to simple vision about chemistry teaching. DOI: http://dx.doi.org/10.17807/orbital.v1i1.71

ANÁLISE EM MALHA FECHADA DO CONTROLADOR GENERALIZED PREDICTIVE CONTROL (GPC)

RESUMO O presente trabalho tem o objetivo de apresentar uma análise em malha fechada do controlador Generalized Predictive Control (GPC). Esta análise visa observar, com detalhes, as características deste tipo de controlador. Os detalhes apresentados são de extrema importância na análise de estabilidade robusta. Alguns resultados de simulação são apresentados. PALAVRAS-CHAVE: Controle preditivo, sistemas em malha fechada. CLOSED-LOOP ANALYSIS OF GENERALIZED PREDICTIVE CONTROL (GPC) ABSTRACT This paper presents a closed loop analysys of Generalized Predictive Control GPC. This analysis observes, in details, the features of this kind of predictive controller The details showed are very important in robust stability analysis. Simulation results are shown. KEY-WORDS: Predictive control, closed-loop systems