An Investigation of a Method for the Analysis of Smokes According to Particle Size

An electrical precipitation method for the analysis of smokes according to particle size has been investigated. A thin stream of smoke particles moving under laminar conditions in a wind tunnel of rectangular cross section is electrically charged in a small region. The charged particles are then precipitated by the uniform field existing between the charged upper plate and the grounded lower plate of the wind tunnel as a long track along the lower plate. The size-frequency distributions of the particles precipitated at various points on the lower plate were determined from measurements on enlargements of electron-microscope photographs of samples of the smoke precipitated at various points. The agreement between theory and experiment is fair, but the range of sizes of the particles precipitated at a given point is rather large

A responsabilidade civil de pais separados por ato ilícito de filho menor

TCC(graduação) - Universidade Federal de Santa Catarina. Centro de Ciências Jurídicas. Direito.A presente monografia tem por objetivo investigar o problema da responsabilidade civil de pais separados por ato ilícito cometido por filho menor. Pretende-se averiguar a quem deve ser atribuída a responsabilidade civil nas situações envolvendo pais separados, analisando-se os institutos do poder familiar e da guarda, pesquisando-se a jurisprudência e interpretando-se a lei

The Structure of Cerium at the Temperature of Liquid Air

In a dilatometric investigation of metallic cerium Trombe and Foex observed under certain conditions a transition at 109°K which was accompanied by a 10 percent volume decrease and a decrease in magnetic susceptibility. Professor Linus Pauling suggested to us in 1946 that this transition is caused by the promotion of 4f electron to a bond-forming orbital, and that the dense phase be studied by x-ray diffraction. This investigation described below was completed in 1948. Lawson and Tang have recently produced the transition at 15,000 atmospheres; they found there essentially the same structure which we found at the temperature of liquid air

Bioturbation in a Declining Oxygen Environment, in situ Observations from Wormcam

Bioturbation, the displacement and mixing of sediment particles by fauna or flora, facilitates life supporting processes by increasing the quality of marine sediments. In the marine environment bioturbation is primarily mediated by infaunal organisms, which are susceptible to perturbations in their surrounding environment due to their sedentary life history traits. Of particular concern is hypoxia, dissolved oxygen (DO) concentrations ≤2.8 mg l−1, a prevalent and persistent problem that affects both pelagic and benthic fauna. A benthic observing system (Wormcam) consisting of a buoy, telemetering electronics, sediment profile camera, and water quality datasonde was developed and deployed in the Rappahannock River, VA, USA, in an area known to experience seasonal hypoxia from early spring to late fall. Wormcam transmitted a time series of in situ images and water quality data, to a website via wireless internet modem, for 5 months spanning normoxic and hypoxic periods. Hypoxia was found to significantly reduce bioturbation through reductions in burrow lengths, burrow production, and burrowing depth. Although infaunal activity was greatly reduced during hypoxic and near anoxic conditions, some individuals remained active. Low concentrations of DO in the water column limited bioturbation by infaunal burrowers and likely reduced redox cycling between aerobic and anaerobic states. This study emphasizes the importance of in situ observations for understanding how components of an ecosystem respond to hypoxia

Mapping the Relationship Among Political Ideology, CSR Mindset, and CSR Strategy: A Contingency Perspective Applied to Chinese Managers

The literature on antecedents of corporate social responsibility (CSR) strategies of firms has been predominately content driven. Informed by the managerial sense-making process perspective, we develop a contingency theoretical framework explaining how political ideology of managers affects the choice of CSR strategy for their firms through their CSR mindset. We also explain to what extent the outcome of this process is shaped by the firm’s internal institutional arrangements and external factors impacting on the firm. We develop and test several hypotheses using data collected from 129 Chinese managers. The results show that managers with a stronger socialist ideology are likely to develop a mindset favouring CSR, which induces the adoption of a proactive CSR strategy. The CSR mindset mediates the link between socialist ideology and CSR strategy. The strength of the relationship between the CSR mindset and the choice of CSR strategy is moderated by customer response to CSR, industry competition, the role of government, and CSR-related managerial incentives

Algoritmo adaptativo de detecção de faltas de alta impedância em redes de distribuição usando as transformadas de Park e wavelet

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2017.Este trabalho aborda a detecção de faltas de alta impedância em redes elétricas de distribuição. Propõe-se um método de detecção através de sinais de tensão, provenientes do equipamento de proteção do sistema elétrico, que utiliza a transformada de Park para agregação dos sinais das três fases em apenas um sinal (tensão de eixo direto) e posterior análise de transitório com a transformada wavelet. A partir deste ponto, o sinal em destaque é avaliado por um algoritmo adaptativo, o qual é responsável por determinar se há ou não a ocorrência de falta de alta impedância, diferenciando principalmente de transitórios envolvendo aspectos de qualidade de energia elétrica. Os sinais de correntes, provenientes do equipamento de proteção, também estão presentes no algoritmo para definir se a falta de alta impedância ocorreu no respectivo trecho de proteção em análise. Os resultados obtidos com a metodologia proposta indicam a correta detecção de falta de alta impedância e a capacidade de diferenciar dos demais transitórios devido principalmente às características intrínsecas do arco elétrico.Abstract : This work focuses on the detection of high impedance faults in electrical distribution networks. A method of detection is proposed through voltage signals from the protective device, that uses the Park transform to aggregate the signals of the three phases in only one signal (direct-axis voltage) and subsequent transient analysis with the wavelet transform. From this point, the signal is evaluated by an adaptive algorithm that is responsible for determining whether there is or not the occurrence of high impedance fault, differing mainly from transients involving aspects of electric power quality. The current signals from the protective equipment are also present in the algorithm to determine if the high impedance fault occurred in the respective protection section under analysis. The results obtained with the proposed methodology indicate the correct detection of high impedance fault and the capacity to differentiate from the other transients due mainly to the intrinsic characteristics of the electric arc