Job satisfaction among control room operators of electrical systems

Shift workers from control centers of electrical systems are a group that has received little attention in Brazil. This study aimed to compare workers' job satisfaction at five control centers of a Brazilian company electrical system, and according to their job titles. Method: The Organization Satisfaction Index (OSI) questionnaire to assess job satisfaction was used. ANOVA was used to compare OSI means, according to job title and control center. The results showed that there is no difference in job satisfaction among job titles, but a significant difference was found according to the control center. A single organizational culture cannot be applied to several branches. It is required to implement actions that would result in job satisfaction improvements among workers of all studied control rooms centers. The high level of education of operators working in all centers might have contributed to the similar values of perceived satisfaction among distinct job titles.

GEOMETRIC RELATIONS BETWEEN SPACES OF NUCLEAR OPERATORS AND SPACES OF COMPACT OPERATORS

We extend and provide a vector-valued version of some results of C. Samuel about the geometric relations between the spaces of nuclear operators N(E, F) and spaces of compact operators K(E, F), where E and F are Banach spaces C(K) of all continuous functions defined on the countable compact metric spaces K equipped with the supremum norm. First we continue Samuel's work by proving that N(C(K-1), C(K-2)) contains no subspace isomorphic to K(C(K-3), C(K-4)) whenever K-1, K-2, K-3 and K-4 are arbitrary infinite countable compact metric spaces. Then we show that it is relatively consistent with ZFC that the above result and the main results of Samuel can be extended to C(K-1, X), C(K-2,Y), C(K-3, X) and C(K-4, Y) spaces, where K-1, K-2, K-3 and K-4 are arbitrary infinite totally ordered compact spaces; X comprises certain Banach spaces such that X* are isomorphic to subspaces of l(1); and Y comprises arbitrary subspaces of l(p), with 1 < p < infinity. Our results cover the cases of some non-classical Banach spaces X constructed by Alspach, by Alspach and Benyamini, by Benyamini and Lindenstrauss, by Bourgain and Delbaen and also by Argyros and Haydon.

Genetic analyses of smoking initiation, persistence, quantity, and age-at-onset of regular cigarette use in Brazilian families: the Baependi Heart Study

Background: The purpose of this study was to estimate the genetic influences on the initiation of cigarette smoking, the persistence, quantity and age-at-onset of regular cigarette use in Brazilian families. Methods: The data set consisted of 1,694 individuals enrolled in the Baependi Heart Study. The heritability and the heterogeneity in genetic and environmental variance components by gender were estimated from variance components approaches, using the SOLAR (Sequential Oligogenic Linkage Analysis Routines) computer package. The mixed-effects Cox model was used for the genetic analysis of the age-at onset of regular cigarette use. Results: The heritability estimates were high (> 50%) for smoking initiation and were intermediate, ranging from 23.4 to 31.9%, for smoking persistence and quantity. Significant evidence for heterogeneity in variance components by gender was observed for smoking initiation and age-at-onset of regular cigarette use. Genetic factors play an important role in the interindividual variation of these phenotypes in females, while in males there is a predominant environmental component, which could be explained by greater social influences in the initiation of tobacco use. Conclusions: Significant heritabilities were observed in smoking phenotypes for both males and females from the Brazilian population. These data add to the literature and are concordant with the notion of significant biological determination in smoking behavior. Samples from the Baependi Heart Study may be valuable for the mapping of genetic loci that modulate this complex biological trait.

Risk factors for computer visual syndrome (CVS) among operators of two call centers in Sao Paulo, Brazil

The aims of this study were to investigate work conditions, to estimate the prevalence and to describe risk factors associated with Computer Vision Syndrome among two call centers' operators in Sao Paulo (n = 476). The methods include a quantitative cross-sectional observational study and an ergonomic work analysis, using work observation, interviews and questionnaires. The case definition was the presence of one or more specific ocular symptoms answered as always, often or sometimes. The multiple logistic regression model, were created using the stepwise forward likelihood method and remained the variables with levels below 5% (p < 0.05). The operators were mainly female and young (from 15 to 24 years old). The call center was opened 24 hours and the operators weekly hours were 36 hours with break time from 21 to 35 minutes per day. The symptoms reported were eye fatigue (73.9%), "weight" in the eyes (68.2%), "burning" eyes (54.6%), tearing (43.9%) and weakening of vision (43.5%). The prevalence of Computer Vision Syndrome was 54.6%. Associations verified were: being female (OR 2.6, 95% CI 1.6 to 4.1), lack of recognition at work (OR 1.4, 95% CI 1.1 to 1.8), organization of work in call center (OR 1.4, 95% CI 1.1 to 1.7) and high demand at work (OR 1.1, 95% CI 1.0 to 1.3). The organization and psychosocial factors at work should be included in prevention programs of visual syndrome among call centers' operators.

Periodic averaging theorems for various types of equations

We prove a periodic averaging theorem for generalized ordinary differential equations and show that averaging theorems for ordinary differential equations with impulses and for dynamic equations on time scales follow easily from this general theorem. We also present a periodic averaging theorem for a large class of retarded equations.

Remarks on the classification of a pair of commuting semilinear operators

Gelfand and Ponomarev [I.M. Gelfand, V.A. Ponomarev, Remarks on the classification of a pair of commuting linear transformations in a finite dimensional vector space, Funct. Anal. Appl. 3 (1969) 325-326] proved that the problem of classifying pairs of commuting linear operators contains the problem of classifying k-tuples of linear operators for any k. We prove an analogous statement for semilinear operators. (C) 2011 Elsevier Inc. All rights reserved.

Schrodinger and Dirac operators with the Aharonov-Bohm and magnetic-solenoid fields

We construct all self-adjoint Schrodinger and Dirac operators (Hamiltonians) with both the pure Aharonov-Bohm (AB) field and the so-called magnetic-solenoid field (a collinear superposition of the AB field and a constant magnetic field). We perform a spectral analysis for these operators, which includes finding spectra and spectral decompositions, or inversion formulae. In constructing the Hamiltonians and performing their spectral analysis, we follow, respectively, the von Neumann theory of self-adjoint extensions of symmetric operators and the Krein method of guiding functionals.

Regular and moderate exercise before experimental sepsis reduces the risk of lung and distal organ injury

de Araujo CC, Silva JD, Samary CS, Guimaraes IH, Marques PS, Oliveira GP, do Carmo LGRR, Goldenberg RC, Bakker-Abreu I, Diaz BL, Rocha NN, Capelozzi VL, Pelosi P, Rocco PRM. Regular and moderate exercise before experimental sepsis reduces the risk of lung and distal organ injury. J Appl Physiol 112: 1206-1214, 2012. First published January 19, 2012; doi:10.1152/japplphysiol.01061.2011.-Physical activity modulates inflammation and immune response in both normal and pathologic conditions. We investigated whether regular and moderate exercise before the induction of experimental sepsis reduces the risk of lung and distal organ injury and survival. One hundred twenty-four BALB/c mice were randomly assigned to two groups: sedentary (S) and trained (T). Animals in T group ran on a motorized treadmill, at moderate intensity, 5% grade, 30 min/day, 3 times a week for 8 wk. Cardiac adaptation to exercise was evaluated using echocardiography. Systolic volume and left ventricular mass were increased in T compared with S group. Both T and S groups were further randomized either to sepsis induced by cecal ligation and puncture surgery (CLP) or sham operation (control). After 24 h, lung mechanics and histology, the degree of cell apoptosis in lung, heart, kidney, liver, and small intestine villi, and interleukin (IL)-6, KC (IL-8 murine functional homolog), IL-1 beta, IL-10, and number of cells in bronchoalveolar lavage (BALF) and peritoneal lavage (PLF) fluids as well as plasma were measured. In CLP, T compared with S groups showed: 1) improvement in survival; 2) reduced lung static elastance, alveolar collapse, collagen and elastic fiber content, number of neutrophils in BALF, PLF, and plasma, as well as lung and distal organ cell apoptosis; and 3) increased IL-10 in BALF and plasma, with reduced IL-6, KC, and IL-1 beta in PLF. In conclusion, regular and moderate exercise before the induction of sepsis reduced the risk of lung and distal organ damage, thus increasing survival.

Cosmological measure with volume averaging and the vacuum energy problem

In this paper, we give a possible solution to the cosmological constant problem. It is shown that the traditional approach, based on volume weighting of probabilities, leads to an incoherent conclusion: the probability that a randomly chosen observer measures Lambda = 0 is exactly equal to 1. Using an alternative, volume averaging measure, instead of volume weighting can explain why the cosmological constant is non-zero.

Musculoskeletal reported symptoms among aircraft assembly workers: a multifactorial approach

The aim of this study was to evaluate factors associated with reported work-related musculoskeletal symptoms among aircraft assembly workers. Population consisted of 552 (491 men/61 women) workers who performed tasks related to the work of aircraft assembly. Participants completed a comprehensive questionnaire, including socio-demographic information, habits/lifestyles, working conditions, and work organization. Workers also answered the Nordic Musculoskeletal Questionnaire to obtain data on musculoskeletal symptoms. Multivariate logistic regression was performed to analyze factors associated with musculoskeletal reported symptoms. Results showed that body regions with the highest prevalence of reported musculoskeletal symptoms were similar when referred the past twelve months and the past seven days. Significant factors associated with musculoskeletal symptoms included variables related to conflicts at work, sleep problems, mental fatigue, and lack of time for personal care and recovery. Working time in the industry was associated only with reports for the last seven days and regular physical activity off-work seems to be a positive factor in preventing musculoskeletal symptoms for the past twelve months. The results highlight the multi-factorial nature of the problem. Actions to prevent musculoskeletal diseases at the aircraft assembly work should consider multiple interventions that would promote better recovery between work shifts.

Photoconduction action spectra of regio-regular poly(3-hexylthiopene):TiO2 diodes

The development of polymer-based photovoltaic devices brings the promise of low-cost and lightweight solar energy conversion systems. This technology requires new materials and device architectures with enhanced efficiency and lifetime, which depends on the understanding of charge-transport mechanisms. Organic films combined with electronegative nanoparticles may form systems with efficient dissociation of the photogenerated excitons, thus increasing the number of carriers to be collected by the electrodes. In this paper we investigate the steady-state photoconductive action spectra of devices formed by a bilayer of regio-regular poly(3-hexylthiophene) (RRP3HT) and TiO2 sandwiched between ITO and aluminum electrodes (ITO/TiO2:RRP3HT/Al). Photocurrents were measured for distinct bias voltages with illumination from either side of the device. Heterojunction structures were prepared by spin coating a RRP3HT film on an already deposited TiO2 layer on ITO. Symbatic and antibatic curves were obtained and a model for photocurrent action spectra was able to fit the symbatic responses. The quantum yield increased with the electric field, indicating that exciton dissociation is a field-assisted process as in an Onsager mechanism. Furthermore, the quantum yield was significantly higher when illumination was carried out through the ITO electrode onto which the TiO2 layer was deposited, as the highly electronegative TiO2 nanoparticles were efficient in exciton dissociation.

Inclusão de crianças com deficiência na escola regular numa região do município de São Paulo: conhecendo estratégias e ações

A inclusão de alunos com necessidades educacionais especiais no ensino regular depende da preparação da comunidade escolar para promover a participação de todos os alunos. Foi objetivo deste estudo conhecer, do ponto de vista do professor do ensino fundamental da rede pública municipal, as estratégias pedagógicas que utilizavam para a inclusão de crianças com deficiência na classe comum. Para isso foram realizadas entrevistas semiestruturadas individuais e, posteriormente, grupais com 11 professores de cinco escolas, um representante do Centro de Formação e Acompanhamento à Inclusão e um coordenador pedagógico. As entrevistas foram gravadas e transcritas. Após diversas leituras foi possível identificar como temáticas principais: sentidos e imaginários do professor sobre a deficiência, formação do professor para efetivação do processo de inclusão, bem como a utilização de estratégias pedagógicas diferenciadas e formação de rede de apoio na escola. Os entrevistados utilizavam estratégias gerais como aula expositiva, debates, e específicas como: avaliação dos alunos, adaptação do material, atividades em duplas, parceria com o professor da sala de apoio e acompanhamento à inclusão. Parte dos entrevistados trouxe uma visão com relação aos alunos com deficiência permeada de possibilidades, acreditando no potencial de aprendizagem dos mesmos, enquanto para outros, o discurso centrou-se, sobretudo, na impossibilidade da aprendizagem. Os docentes identificaram a necessidade de apoio institucional para seu trabalho, incluindo possibilidades de formação a partir das demandas cotidianas. Responder às necessidades levantadas é parte dos desafios para implementar a Educação Inclusiva na perspectiva da Educação para Todos, para a efetivação dos direitos de crianças com necessidades educacionais especiais.

Impacto da orientação para a prática regular de atividade física dois anos após o parto

OBJETIVOS: avaliar as modificações na prática de atividade física (AF) e as barreiras para adoção de um estilo de vida saudável em mulheres que receberam orientações nutricionais e de AF durante a gestação e no primeiro ano após o parto. MÉTODOS: estudo de coorte com 57 mulheres (Grupo Controle = 29 e Grupo Intervenção = 28), e idade média igual a 28 (±6) anos. As informações foram obtidas através de entrevistas em visita domiciliar (durante a intervenção) e inquérito telefônico (um ano após o término da intervenção), utilizou-se questionário de AF. Para análise das barreiras foi realizada uma entrevista semiestruturada com questões abertas, as quais foram codificadas e agrupadas para análise dos dados. Foram realizados testes de qui-quadrado, Mann-Whitney U e Friedman. RESULTADOS: aos seis meses, apenas 30% das mulheres do grupo Intervenção realizavam AF no lazer pelo menos 120 minutos por semana, contra 10% do grupo Controle, reduzindo para 18% e 4%, respectivamente, dois anos após o parto. As principais barreiras à prática de AF regular foram: falta de tempo (44%), cuidado com os filhos (37%), trabalho (21%), afazeres domésticos (21%) e comodismo (26%). CONCLUSÕES: futuros programas devem priorizar a aquisição de conhecimento, visando à adoção de um estilo de vida ativo no pós-parto, considerando as barreiras maternas.

Inclusão do portador de necessidades especiais no ensino regular: revisão da literatura

OBJETIVOS: Analisar criticamente a inclusão do portador de necessidades especiais no ensino regular brasileiro, considerando aspectos sociais e jurídicos, por meio de revisão de literatura. ESTRATÉGIA DE PESQUISA: A pesquisa bibliográfica foi conduzida em bases de dados de acesso público: LILACS, SciELO, Portal Cochrane e IUSDATA, sendo esta última da Biblioteca da Faculdade de Direito da Universidade de São Paulo, considerando todos os artigos publicados até o mês de dezembro de 2010. Como estratégia de busca foram utilizados os seguintes termos livres: educação inclusiva, educação especial, proposta inclusiva e portador de necessidades especiais. CRITÉRIOS DE SELEÇÃO: Durante a busca, foram avaliados e selecionados apenas os estudos cujo resumo ou corpo do artigo tivesse relação com o objetivo proposto. ANÁLISE DE DADOS : Os artigos potencialmente relevantes para a revisão foram apresentados em uma ficha protocolar contendo critérios de elegibilidade do estudo, métodos utilizados, características do grupo de artigos analisado, tipo de intervenção realizada e resultados obtidos no estudo. Os artigos classificados como opinião de especialistas, apesar de apresentarem baixo nível de evidência científica, foram incluídos no trabalho, pois são frequentemente encontrados na literatura sobre o assunto. RESULTADOS: Foram encontrados 1.399 artigos, e após leitura dos resumos foram selecionados 120 artigos potencialmente relevantes considerando-se o objetivo da pesquisa. Destes, 67 artigos foram citados em mais de uma base de dados, o que resultou em 53 artigos para serem lidos na íntegra. Após a leitura dos 53 artigos, foram excluídos 15 que não se enquadravam nos critérios de inclusão. Desta forma, 38 estudos foram incluídos e analisados. CONCLUSÃO: Após a análise crítica da literatura da área conclui-se que, até o momento, de maneira geral, a escola recebe, mas há muito a percorrer para incluir os alunos portadores de necessidades especiais, embora o país possua o escopo da inclusão. Assim, faz-se necessário o estabelecimento de diretrizes e ações políticas visando uma inclusão efetiva.

Sharp estimates for eigenvalues of integral operators generated by dot product kernels on the sphere

We obtain explicit formulas for the eigenvalues of integral operators generated by continuous dot product kernels defined on the sphere via the usual gamma function. Using them, we present both, a procedure to describe sharp bounds for the eigenvalues and their asymptotic behavior near 0. We illustrate our results with examples, among them the integral operator generated by a Gaussian kernel. Finally, we sketch complex versions of our results to cover the cases when the sphere sits in a Hermitian space.