In this study the exposure of mining vehicle operators, on an opencast goldmine in Tanzania, to certain hazards specific to their occupation was assessed. The aim was to quantify these levels of exposure in order to estimate the risk of health effects but also to report levels of these hazards that exist on mining vehicles. Three different hazards with different physiological effects were assessed and it included exposure to whole-body vibration, A-weighted noise and low frequency noise. In each case correctly calibrated instrumentation was used and internationally accepted methods were followed. It was found that mining vehicles commonly exposed operators to levels of whole-body vibration within and above the ISO Health Guidance Caution Zone (HGCZ) and above the ropean action level, which indicates the need for intervention and control. These levels are a cause for concern and will likely lead to health effects. Noise that damages human hearing (A-weighted noise) was present in high levels on mining vehicles, in each case being higher than the permissible exposure limit of 85 dB(A). Thus operators of mining vehicles are exposed to noise levels that will damage their hearing in time. A potential hazard in the occupational world, low frequency noise, was also included in the assessment. Literature indicates that low frequency noise is capable of causing many human health effects and thus levels on mining vehicles were reported in order to give an indication of what levels may be expected in this department of mining. It was found that much of the sound energy measured on vehicles was located in the low frequency range. In the lowest frequency band measured, Leq levels of more than 100 dB(Z) were commonly found. Controls should be implemented as far as is reasonably practicable to ensure that operators are not exposed above recommended or permissible levels for each hazard. These controls can include good maintenance of vehicles and roads to reduce whole-body vibration, sound proofing of vehicle cabs along with hearing protection devices to protect hearing and further research regarding the exposure and health effects caused by low frequency noise. Following literature indicating the physiological effects of low frequency noise exposure and also the presence thereof in different occupations, it is concluded that A-weighted noise measurements alone can not be used when quantifying the risk involved in a given acoustical environment. / Thesis (M.Sc. (Occupational Hygiene))--North-West University, Potchefstroom Campus, 2009

In this study the exposure of mining vehicle operators, on an opencast goldmine in Tanzania, to certain hazards specific to their occupation was assessed. The aim was to quantify these levels of exposure in order to estimate the risk of health effects but also to report levels of these hazards that exist on mining vehicles. Three different hazards with different physiological effects were assessed and it included exposure to whole-body vibration, A-weighted noise and low frequency noise. In each case correctly calibrated instrumentation was used and internationally accepted methods were followed. It was found that mining vehicles commonly exposed operators to levels of whole-body vibration within and above the ISO Health Guidance Caution Zone (HGCZ) and above the ropean action level, which indicates the need for intervention and control. These levels are a cause for concern and will likely lead to health effects. Noise that damages human hearing (A-weighted noise) was present in high levels on mining vehicles, in each case being higher than the permissible exposure limit of 85 dB(A). Thus operators of mining vehicles are exposed to noise levels that will damage their hearing in time. A potential hazard in the occupational world, low frequency noise, was also included in the assessment. Literature indicates that low frequency noise is capable of causing many human health effects and thus levels on mining vehicles were reported in order to give an indication of what levels may be expected in this department of mining. It was found that much of the sound energy measured on vehicles was located in the low frequency range. In the lowest frequency band measured, Leq levels of more than 100 dB(Z) were commonly found. Controls should be implemented as far as is reasonably practicable to ensure that operators are not exposed above recommended or permissible levels for each hazard. These controls can include good maintenance of vehicles and roads to reduce whole-body vibration, sound proofing of vehicle cabs along with hearing protection devices to protect hearing and further research regarding the exposure and health effects caused by low frequency noise. Following literature indicating the physiological effects of low frequency noise exposure and also the presence thereof in different occupations, it is concluded that A-weighted noise measurements alone can not be used when quantifying the risk involved in a given acoustical environment. / Thesis (M.Sc. (Occupational Hygiene))--North-West University, Potchefstroom Campus, 2009

This thesis deals with the distribution of noise in the computer case and radiation into the neighborhood. Influence of geometrical shape and size of the computer case on radiated noise from the computer was investigated as well as effect of placement of the fan. Reducing noise by using sound absorbing material into computer case and result of the suitable position of the computer in the working environment were also tested. Simulation of the noise diffusion and effectivity of anti-noise equipment was executed in Ansys FEM program.

Made available in DSpace on 2016-04-26T18:16:03Z (GMT). No. of bitstreams: 1 Beatriz de Araujo Britto.pdf: 515141 bytes, checksum: 41630fb51e967b104dfaca949b5894cb (MD5) Previous issue date: 2007-03-28 / Analyze the relation between media´s discourse and the action of the theatral group Ói Nóis Aqui Traveiz, from Porto Alegre. The media which tries to territorialize the Ói Nóis´s practice throught the use of clichés and words of order, orders and commands which enforce an order; and the actions´s group as a minor mode, movement of deterritorialization where the sense becomes production, to go beyond representation´s idea. The anaysis was based on philosophy of difference, more precisely the Deleuze and Guattari´s work, A Thousand Plateaus, with concepts such as becoming, ritornelo, body without organs, rhizoma. The work trying also to detect some procedures of Ói Nóis´s theatrical language as means to produce new subjectivisations´s forms. The creation´s act and the art as a becoming space, which breaks the fixed significations and the values established by the majority / O foco desta tese é o estudo da relação dos discursos da mídia com a ação do grupo teatral Ói nóis Aqui Traveiz, de Porto Alegre. Em nossa abordagem a mídia será considerada aqui por suas estratégias de biopoder poder sobre a vida , em contraposição à ação de alteridade, de desterritorialização em que o sentido torna-se produção para além da idéia de representação a biopotência. É do contrachoque entre estes dois territórios, o fixo e o móvel, que brechas podem surgir, potencializando os pontos de resistência do grupo presentes também nas redes de poder. Mais especificamente, a tese analisa a relação do grupo com a mídia jornalística; como se processa a reação da imprensa em relação à linguagem do grupo e à intervenção em diversas manifestações culturais e políticas da cidade, aspectos sócio-culturais e políticos que influem na recepção da mídia em relação à atuação do grupo dentro da comunidade . Para pensar este contraponto a tese se vale da filosofia da diferença, mais precisamente da obra de Gilles Deleuze e Félix Guattari quando estes expõem a fórmula do devir e sua concatenação, sobretudo, com a idéia de ritornelo e corpo sem órgãos, tal qual apresentada em Mil Platôs. Para dar concretude à dinâmica dos conceitos implicados, a tese traz a análise da natureza dos diferentes discursos na relação cenamídia. Busca também detectar alguns dos principais procedimentos da prática cênica do grupo e seu histórico, investigando também até que ponto tais procedimentos podem potencializar uma estratégia de biopotência através da linha de fuga dos processos de subjetivação. Partimos do princípio de que a ação do grupo pode se tornar uma possibilidade de fuga das potências de controle (Estado, Comunicação, TV), uma estratégia de resistência a essas potências, à homogeneização do pensamento, na medida em que busque liberar os automatismos da percepção e os hábitos perceptivos já cristalizados. O ato de criação e a arte serão vistos como espaço do devir, que rompe com os significados pré-fixados, os códigos e valores estabelecidos pela razão do aparelho de Estado, devir-minoritário como desvio padrão dominante, processo pelo qual o grupo se subtrai à maioria. Outras referências importantes para a tese são a obra de Michel Foucault, no que tange à relação entre discurso, dispositivos de normalização e estruturas de poder, bem como a subversão destas mesmas estruturas como prática de resistência às estratégias de biopoder. A noção de metafísica da linguagem como signos de forças, da obra de Artaud. Por fim, também serão referências as obras de Peter Pál Pelbart referentes ao contraponto biopoder-biopotência

Les travaux de cette thèse portent sur l'identification des systèmes et l'extraction de motifs à partir de données. Dans le cadre de l'identification des systèmes, nous nous intéressons plus précisément à l'identification des systèmes dynamiques hybrides et l'identification des systèmes dynamiques linéaires ayant une sortie binaire. Deux classes très populaires des systèmes hybrides sont les systèmes linéaires à commutations et les systèmes affines par morceaux. Nous faisons tout d'abord un état de l'art sur les méthodes d'identification de ces deux classes. Nous proposons ensuite un algorithme basé sur une méthode d'identification de type OBE "Outer Bounding Ellipsoid" pour l'identification en temps réel des systèmes à commutations soumis à un bruit borné. Nous présentons ensuite plusieurs extensions de l'algorithme soit pour l'identification des systèmes affines par morceaux, l'identification des systèmes à commutations décrits par un modèle du type erreur de sortie et l'identification des systèmes MIMO à commutations. Nous abordons ensuite le problème d'identification des systèmes linéaires ayant une sortie binaire en introduisant un point de vue original consiste à formuler le problème d'identification comme un problème de classification. Ceci permet de proposer deux algorithmes d'identification basés sur l'utilisation des SVMs. Le premier algorithme est dédié à l'identification des systèmes à temps discret et le deuxième algorithme est dédié à l'identification des systèmes à temps continu. Dans le cadre de l'extraction de motifs, nous présentons dans un premier temps un état de l'art sur les algorithmes d'extraction de motifs et sur les techniques de la classification non supervisée. Ensuite, nous proposons un algorithme d'extraction de motifs à partir des données basé sur des techniques de classification non supervisée. / In this thesis, we deal with the identification of systems and the extraction of patterns from data. In the context of system identification, we focus precisely on the identification of hybrid systems and the identification of linear systems using binary sensors. Two very popular classes of hybrid systems are switched linear systems and piecewise affine systems. First, we give an overview of the different approaches available in the literature for the identification of these two classes. Then, we propose a new real-time identification algorithm for switched linear systems, it's based on an Outer Bounding Ellipsoid (OBE) type algorithm suitable for system identification with bounded noise. We then present several extensions of the algorithm either for the identification of piecewise affine systems, the identification of switched linear systems described by an output error model and the identification of MIMO switched linear systems. After this, we address the problem of the identification of linear systems using binary sensors by introducing an original point of view. We formulate the identification problem as a classification problem. This formulation allows the use of supervised learning algorithms such as Support Vector Machines (SVMs) for the identification of discrete time systems and the identification of continuous-time systems using binary sensors. In the context of pattern extraction, we first present an overview of the different pattern extraction algorithms and clustering techniques available in the literature. Next, we propose an algorithm for extracting patterns from data based on clustering techniques.

Clouds are ubiquitous and ever-changing feature of the outdoors. They are an integral factor in Earth's weather systems. Component of water circulation in a nature and a strong indicator of weather patterns and changes. Clouds are important component of the visual simulation of any outdoor scene, but the complexity of cloud formation, dynamics, and light interaction makes cloud simulation and rendering difficult in real time. In an interactive flight simulation, users would like to fly in and around realistic, volumetric clouds. I Present, two main ways of representation cloud in computer graphic, where one way use for modelling Perlin noise and second one use for modelling fluid dynamic system.

The transformation of rural people and land to urban land and culture is a natural discourse and inevitable process. In the process, more than half of the current world population are living in urban centres. The number of urban centres and their population is rapidly increasing while the situation of integrated development of urban centres and rural areas such URELs for sustainable development have given less attention in agricultural based countries (ABCs). Multi-disciplinary (agriculture and agro-industries) integration, multi-spatial (urban centre and its hinterlands) linkages, multiscalar (micromeso and macro) levels, multi-actors and stakeholders involvement are the noteworthy innovations in the field of development studies. This study mainly focused on URELs for agribusiness and value chains under the development themes of governance and development as well as contemporary debates. Policies, institutional settings and practical implementation strategies of integrated and balanced development discourse of basic sectoral and urban-rural economic linkages (URELs) missed in ABCs such as Ethiopia‟s comprehensive development policy ADLI neglecting the rapidly growing urban centres. Owing to this, this study is designed to examine the challenges and problems, status and agribusiness and efficiencies of URELs for exploring theoretical empirical model for virtuous circle URELs. Methodologically, the study used sequential explanatory mixed methods research and cross-sectional survey design. The sequential approach was quantitative method, qualitative method and integrating the two findings on interpretation and discussion. The findings present truncated BPLs and FPLs of agriculture and agroindustries. It was was mainly due to poor and greater ranges of efficiency from TE, AE and EE for both agriculture and agro-industries, form of government as ethnic-federalism and regionalism, violation of the existing institutional frameworks, dejure-defacto discrminatin, government businesses, policy and institutional settings, lack of R&D, many paradoxical acts and poor resources mobilization and utilization. These problems and challenges are taken as potential opportunities for improvement and new lens of developing empirical model. The overall recommendation lies on creating enabling environment for virtuous circle URELs and integrated regional development using regional development approach, avoiding illegal interventions, import-export balance, proper resource mobilization and utilization. / Development Studies / D. Litt. et Phil. (Development Studies)