Made available in DSpace on 2016-04-28T14:16:40Z (GMT). No. of bitstreams: 1 Alcides Ferreira Goes.pdf: 8273987 bytes, checksum: 0e3e99568082e4f5bc12b36ba488610b (MD5) Previous issue date: 2009-05-21 / Secretaria da Educação do Estado de São Paulo / Between the end of the century XVIII and the first half of the century XIX, a lot of modifications were in process in relation to the graphic arts. The search for improvements in printing images involved the own equipment, the form of fixation of the types to compose the matrix, the innovations in the distribution of the ink, new fittings between the matrix and the inking system, the mechanization of the printing press by the force of the vapor, and also alterations in the preparation of appropriate impression inks to that group of changes. Thus, in this work, we analyze recipes to make inks and their relationships with the processes and the changes involved in this art, starting the analysis of a manual of impression inks published in the first half of the century XIX - On the Preparation of Printing Ink: both Black and Coloured (1832), written by William Savage (1771-1844). We will approach the subject of the ink starting from the context in that the manual was published, evidencing practices of production on printing inks and the old knowledge registered in text. A group of factors will be presented to promote a better understanding of the influence of the ink in the impression process and your interface with the equipment, with the matrix and your distribution system of the printing press, trying to interpret in the work the secrets of the ingredients used in the revenues of an ink and mainly the way that the author treats on that subject / Entre o final do século XVIII e a primeira metade do século XIX, muitas modificações estavam em processo em relação às artes gráficas. As buscas por melhorias nos sistemas que geravam imagens a partir de uma impressora envolviam o próprio equipamento, as matrizes usadas no sistema de impressão, a forma de fixação dos tipos para compor a matriz, as inovações na distribuição da tinta, novos ajustes entre a matriz e o sistema de entintamento, a mecanização da impressora pelo uso da movimentação baseada na força do vapor, e também alterações no preparo de tintas de impressão adequadas a esse conjunto de mudanças. Assim, neste trabalho, analisaremos receitas de tintas e a sua relação com os processos e as mudanças envolvidas na época, tendo como ponto de partida a análise de um manual de tintas de impressão publicado na primeira metade do século XIX On the Preparation of Printing Ink: both Black and Coloured (1832), escrito por William Savage (1771-1844). Abordaremos a questão da tinta a partir do contexto em que o manual foi publicado, evidenciando as práticas de produção de tintas de impressão e os conhecimentos antigos registrados em texto. Um conjunto de fatores será apresentado para promover um melhor entendimento da influência da tinta no processo de impressão e a sua interface com o equipamento, com a matriz e o seu sistema de distribuição pela impressora, procurando interpretar na obra os segredos dos ingredientes usados nas receitas de uma tinta e principalmente a maneira que o autor trata sobre esse assunto

The thesis deals with the difficulties concerning alcohol use and misuse among Coloured farm workers within the heart of the wine industry in South Africa. The current extent of alcohol use and misuse in the rural areas of the Western Cape Province is commonly referred to as the legacy of the dop system. The dop system was a legislative practice whereas farm workers were provided with small portions of cheap wine throughout the workday. The practice was racially targeted towards Coloureds and thus contributed to the creation of a dependent labour force and extensive alcohol-related difficulties among Coloured farm workers. The dop system was formally abolished in 1961 but the practice proceeded into the 1990s. Alcohol related difficulties do however tend to continue without signs of change. The main purpose of the study is to investigate how current difficulties of alcohol use and misuse affect children’s life outcome and educational opportunities. It has also been important to investigate various aspects of living and working conditions in the farm villages that may be linked to alcohol issues. Another aim is to determine contributing factors to the continuance of alcohol use and misuse despite the abolition of the dop system. The work has been conducted according to the method of oral history theories in order to provide a bottom up approach, thus allowing the perspectives and the stories of the farm workers themselves to come forth. Coloured farm workers in the region are largely affected by socio-economic concerns and uncertainty in regards of labour. Inexpensive and readily available alcohol in illegal liquor outlets, so-called shebeens, is a driving force to the consumption of alcohol. Farm workers are partly isolated upon the farm villages and commonly have limited opportunities of unionizing. This makes it crucial to let the farm workers and their families express how alcohol difficulties are manifested in and affecting their daily lives.

Abstract not available / Thesis (M.A.-Music)-University of Natal, 2000

Power system generators are interconnected in a distributed network to allow sharing of power. If one of the generators cannot meet the power demand, spare power is diverted from neighbouring generators. However, this approach also allows for propagation of electric disturbances. An oscillation arising from a disturbance at a given generator site will affect the normal operation of neighbouring generators and might cause them to fail. Hours of production time will be lost in the time it takes to restart the power plant. If the disturbance is detected early, appropriate control measures can be applied to ensure system stability. The aim of this study is to improve existing algorithms that estimate the oscillation parameters from acquired generator data to detect potentially dangerous power system disturbances. When disturbances occur in power systems (due to load changes or faults), damped oscillations (or &quotmodes") are created. Modes which are heavily damped die out quickly and pose no threat to system stability. Lightly damped modes, by contrast, die out slowly and are more problematic. Of more concern still are &quotnegatively damped" modes which grow exponentially with time and can ultimately cause the power system to fail. Widespread blackouts are then possible. To avert power system failures it is necessary to monitor the damping of the oscillating modes. This thesis proposes a number of damping estimation algorithms for this task. If the damping is found to be very small or even negative, then additional damping needs to be introduced via appropriate control strategies. This thesis presents a number of new algorithms for estimating the damping of modal oscillations in power systems. The first of these algorithms uses multiple orthogonal sliding windows along with least-squares techniques to estimate the modal damping. This algorithm produces results which are superior to those of earlier sliding window algorithms (that use only one pair of sliding windows to estimate the damping). The second algorithm uses a different modification of the standard sliding window damping estimation algorithm - the algorithm exploits the fact that the Signal to Noise Ratio (SNR) within the Fourier transform of practical power system signals is typically constant across a wide frequency range. Accordingly, damping estimates are obtained at a range of frequencies and then averaged. The third algorithm applied to power system analysis is based on optimal estimation theory. It is computationally efficient and gives optimal accuracy, at least for modes which are well separated in frequency.

An experiment was conducted using forty-one Bonsmara steers (age ± 7 months) to determine the effect of zilpaterol hydrochloride (ZH) on the growth performance and carcass characteristics. The trial was structured using a completely randomized design with two treatments, control and ZH group. The steers were fed ZH for 28 consecutive days at the end of the finishing period and ZH was withdrawn from the diet 2 days prior to slaughter of the animals. The steers were placed in individual pens and weighed fortnightly throughout the 4 months trial. Zilpaterol hydrochloride (ZH) was included in the diet at a rate of 8.3 mg/kg of DM. Feeding of ZH increased (P< 0.05) body weight (BW) gain and ADG (1.102 vs. 1.444) and tended to increase (P = 0.067) feed efficiency (F:G) during the last month of the finishing period. There were no significant differences (P> 0.05) in daily dry matter intakes (DMI). For the control group, high treatment weight gains were significantly associated with high initial weight (r = 0.424, P = 0.049) and also high pre-treatment body weight (r = 0.678, P= 0.001). Treatment weight gain increased as the initial and pre-treatment weight gain increased in the control group. For the steers that were fed ZH, there was no significant correlation between the treatment body weight gain with initial weight (r = 0.097, P = 0.694) and also pre- treatment live weight (r = 0.393, P = 0.096). Supplementation of ZH significantly increased (P < 0.0001) the dressing percentage (56.4% vs. 58.4%) and had no significant (P>0.05) effect on the carcass weight. The outcome of the study suggest that supplementation of ZH in the diet during the last month of the finishing period enhances growth performance and shows the repartitioning capacity of the feed additive as a beta- agonist. / Agriculture and  Animal Health / M. Sc. (Agriculture (Animal Science)

Summaries in Afrikaans and English / Die Bruinvrou in die onderwys het 'n besondere rol om te vertolk veral in die !ewe van die volwassewordende kind asook in die hele skoolopset. Die doel van hierdie ondersoek was om hierdie rol te bepaal. Tersaaklike gegewens is verkry deur middel van Iiteratuurstudie, die outobiografiese teks, onderhoude asook vraelyste. Deur die inligting bekom, is vasgestel dat die omstandighede waaronder 'n groot gedcelte van die Bruinonderwyseresse werk, nie altyd gunstig is nie. Baie Bruinlccrclcrs woon in sosio-ekonomiese agtergeblewe gebiede waar misdaad en bendebcdrywighedc aan die orde van die dag is. Waardestelsels, leefstyl van die subkultuur, onvoldoende materiele versorging en gebrekkige opvoeding veroorsaak steuringe in die leerders se ingesteldheid teenoor die skool. Haar vrouwees laat die onderwyseres baie empatie toon in haar opvoedingskommunikasie met die leerder. Sy poog om toereikend na sy behoeftes om te sicn. As medcganger help sy die leerder om elke mylpaal wat hy bereik, te beskou as die begin van 'n ander. Deur haar meelewendheid word veral die milieugestremde Bruinkind se menswaardigheid erken. Baie bruinleerders het aangedui dat onderwyseresse rolmodelle vir hulle is. Sommige onderwyseresse word verplig om jarelank dieselfde graad te onderrig. Aangesien hulle so 'n betekenisvolle rol in die volwassewording van die kind speel, is dit nodig dat hulle ervaring opdoen van die verskillende grade in die skool. Die vrou is baie veelsydig en het moontlikhede wat tocreikcnd aangewend kan word in al die fasette van die skoolopset. Sy kan '11 baie belangrike bydrae lewer in die organisasie en administrasie van die skool as sy die geleentheid gebied word. Haar ingesteldheid op die menslike en die belangrikheid van gesonde verhoudinge asook haar hoe pligsbesef dui daarop dat die onderwyseres by magte is om 'n uitstekende onderwysleier te wees. Nieteenstaande die feit dat onderwyseresse volgens statistieke oorverteenwoordig is in die onderwys, is hulle onderverteenwoordig in bestuursposte. Alhoewel die Grondwet van die Republiek van Suid Afrika 1996, gebaseer is op die beginsels van gelykheid en menswaardigheid, is seksisme en diskriminasie op grond van geslag nog steeds ernstige struikelblokke vir die onderwyseres op haar weg na beter vooruitsigte in die onderwys. Aanbevelings vir praktykverbetering asook verdere navorsing is gemaak. / The Coloured woman in education has a particular role to play, especially in the life of the child growing towards adulthood as well as in the school in general. The aim of this investigation is to determine that role. Relevant information had been obtained by means of literary sources, autobiographical texts, interviews and questionnaires. Having obtained this information, it was established that the circumstances in which a large proportion of Coloured female educators work, are not always favourable. Many coloured learners live in socio-economic disadvantaged areas where crime and gangsterism prevail. Value systems, lifestyles of the subculture, inadequate material care and a serious lack of education are causing disruptions of learners' inclination towards the school. Being a woman enables the female educator to show considerable empathy in her pedagogic communication with the learners. She endeavours to sufficiently provide in their needs. As pedagogic accompanist she assists the learner to see every milestone that he/she achieves as the basis for another. Her involvement brings about an acknowledgement of the human dignity of the milieu-deprived Coloured child. Many coloured learners have indicated that their female educators are their role models. Some female educators are compelled to teach the same grade for years. Their significant role merits experience of teaching the various grades at school. Women are very versatile and have potential which can be utilized adequately in all the facets of the school situation. They can make very important contributions towards the organisation and administration of the school as a whole, given the opportunity. Their focus on human nature and the importance of sound relationships as well as their high sense of duty are indicative of the ability female educators have to become excellent leaders in education. They are nevertheless under-represented in educational management positions. Although the Constitution of the Republic of South Africa, 1996, is based on the principles of equality and human dignity, sexism is still a stumbling block in the path of female educators. Recommendations for an improvement m educational practice as well as further research were made. / Educational Studies / D. Ed. (Filosofie van die Opvoeding)

This study is about the identity of Coloured Pentecostals living in Retreat, Western Cape. It concerns the effects which social change has upon boundary markers and worldview. It uses Robert Schreiter's semiotic approach to culture. Schreiter says that social change along with boundary markers and worldview are the basis for changing identities. This study applies Schreiter's approach to a case study to see if it will work. The study considers the traditional Coloured Pentecostal Culture's identity represented by the older generation of Pentecostals in Retreat. It then considers some responses to those traditional boundary markers and worldview given primarily by the younger generation of Pentecostals. It then suggests some possible solutions to the problems which have been identified as the reasons for the changing cultural and religious identity of the Coloured Pentecostal Culture . / Christian Spirituality, Church History and Missiology / M.Th. (Missiology)

Made available in DSpace on 2016-06-02T19:05:53Z (GMT). No. of bitstreams: 1 3978.pdf: 2293519 bytes, checksum: bebf48e9b57957fa077811d04a5d672e (MD5) Previous issue date: 2010-06-29 / Financiadora de Estudos e Projetos / A Flexible Manufacturing System is a production system where more than one event can occur simultaneously in parallel, asynchronously or concurrently. These are designed to meet the needs of the market, demand for improved product quality, lower costs and shorter delivery times. Due to the complexity and flexibility of these systems, conflicts can occur when more than one process requests the same resource, such as machines or AGVs, or when a product can be produced in more than one production routing. Thus, a conflict resolution policy is needed in this type of environment. This study uses Fuzzy Coloured Petri Nets for modeling a manufacturing system. The manufacturing system is modeled considering the resources, buffers, production routings, AGV routes and identifying conflict points. The conflict resolution is performed considering both information on the shop floor and production management. Fuzzy rules are constructed to prioritize conflicting processes and a fuzzy rule-based system is modeled on Fuzzy Coloured Petri Nets in the same network as the manufacturing system, making the model of the system independent of other systems of support for the resolution of conflicts. In this work we considered the conflicts that can occur when loading and unloading station and the input and output buffer. According to the source of conflict, a rule base is shaped to assign priorities to processes. From this model it is possible to make the control system and ensure that identified conflicts are resolved. / Um Sistema Flexível de Manufatura é um sistema de produção onde mais de um evento pode ocorrer ao mesmo tempo de forma paralela, assíncrona ou de forma concorrente. Estes foram projetados para atender às necessidades do mercado, que demanda por melhor qualidade dos produtos, redução de custos e prazos de entrega menores. Devido à complexidade e à flexibilidade destes sistemas, conflitos podem ocorrer quando mais de um processo requisita o mesmo recurso, como máquinas ou AGVs, ou quando um produto pode ser produzido em roteiros distintos. Assim, uma política de solução de conflito é necessária neste tipo de ambiente. Este trabalho usa Redes de Petri Coloridas Fuzzy para modelar um sistema de manufatura. O sistema de manufatura é modelado considerando os recursos, buffers, roteiros de produção, rotas dos AGV e identificando os pontos de conflitos. A resolução dos conflitos é realizada considerando tanto informações do chão de fábrica quanto da gestão da produção. Regras fuzzy são construídas para atribuir prioridades aos processos conflitantes e um sistema baseado em regras fuzzy é modelado em Redes de Petri Coloridas Fuzzy na mesma rede do sistema de manufatura, tornado o modelo do sistema independente de outros sistemas de apoio para a solução dos conflitos. Neste trabalho foram considerados os conflitos que podem ocorrer na estação de carga e descarga e nos buffer de entrada e saída. De acordo com o ponto de conflito, uma base de regras é modelada para atribuir prioridades aos processos. A partir desta modelagem é possível realizar o controle do sistema e garantir que os conflitos identificados sejam resolvidos.

CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior / This work presents a method to generate games with multilevel and multiple users using Hierarchical Coloured Petri Nets. The design of a multiuser game containing multiple navigation environments (multilevel) is made from the model of a Hierarchical Coloured Petri Net, in which are specified all of the rules, properties and structures of the game. The created model for the game can be formally analysed, verifying the existence of deadlocks and invalid paths, for example, and others possible conception problems, that can be done with the tools available on CPN Tools. To validate this method, a tool has been developed, called CPN Games, which allows fast and dynamic development of simple conception games only using Hierarchical Coloured Petri Nets. The XML codes of the designed models in CPN Tools are interpreted by CPN Games following a set of predefined rules to instantiate different games, without additional programing. It is demonstrated the mechanisms of the design, analysis and validation of the models and finally it is presented several examples of games developed by this tool. / Este trabalho apresenta um mÃtodo para geraÃÃo de jogos multinÃveis e com mÃltiplos usuÃrios por meio de modelagem em Redes de Petri Coloridas HierÃrquicas. A concepÃÃo de um jogo multiusuÃrio, contendo mÃltiplos ambientes de navegaÃÃo (multinÃveis), à feita a partir da criaÃÃo de um modelo hierÃrquico em Rede de Petri Colorida, no qual se especificam todas as regras, propriedades e estruturas do jogo. O modelo criado para o jogo pode ser analisado formalmente, verificando-se, por exemplo, a existÃncia de bloqueios e de transiÃÃes mortas (caminhos invÃlidos), entre outros possÃveis problemas de concepÃÃo, o que pode ser feito com a utilizaÃÃo de ferramentas disponÃveis no CPN Tools. Para validar esse mÃtodo, foi concebida uma ferramenta, denominada CPN Games, que permite o desenvolvimento rÃpido e dinÃmico de jogos de concepÃÃo simples exclusivamente por Rede de Petri Colorida HierÃrquica. Os cÃdigos em XML de modelos constituÃdos com o CPN Tools sÃo interpretadas pelo CPN Games seguindo um conjunto de regras prà estabelecidas para instanciar diferentes jogos, sem a necessidade de programaÃÃo adicional. SÃo demonstrados os mecanismos de criaÃÃo, anÃlise e validaÃÃo dos modelos e diferentes exemplos de jogos construÃdos com a ferramenta.

The Belgian Coastal Zone (BCZ) in the Southern Bight of the North Sea is a highly dynamic and optically complex area. This is due to high non-algal particles (NAP) and coloured dissolved organic matter (CDOM) content which in spring adds together with undesirable blooms of the haptophyte Phaeocystis globosa. There is a need for improving the algorithms for chlorophyll a (chl a) retrieval in these highly turbid waters and for developing algorithms for species detection in order to attempt to create an early warning bloom system. This information will contribute to the knowledge of the extent and magnitude of the P. globosa bloom in Belgian waters. In this study, pure cultures of the main taxa present in the BCZ, diatoms and P. globosa, were combined with field measurements of light absorption of total particles, phytoplankton and dissolved material, pigment determination and phytoplankton counts to address the main objectives. Sampling was performed during 8 cruises covering winter, spring, summer and late summer, and along nearshore-offshore gradients from 2003 to 2006. <p>The area is characterised by a high spatio-temporal variability of IOPs due to the high dynamics of the area in terms of currents, salinity gradients and biological production. During spring the presence of P. globosa modulates the IOPs across all the area, the particle absorption is significantly higher than summer and there is no significant coast-offshore variability for phytoplankton and CDOM. <p>The design of chl a retrieval algorithms assumes negligible absorption of NAP and CDOM in the near infrared (NIR) and the use of a fixed value of specific phytoplankton absorption. It is shown that neglecting the NAP and CDOM absorption in the NIR will have a significant overestimation impact in retrieval of chl a. On the other hand, the specific phytoplankton absorption was found to be highly variable (0.015 „b 0.011 m2 mg chl a-1). Both results will affect directly the retrieved chl a. The spatial variability of CDOM was significant varying between 0.20-1.31 m-1 in the marine area and between 1.81-4.29 m-1 in the Scheldt estuary. CDOM was found to be related to salinity with conservative mixing within the Scheldt estuary and during some seasons in the BCZ, however deviations from conservative mixing suggest other inputs to the CDOM pool. Analyses of the spectral slope of the CDOM absorption curve revealed two main CDOM pools in the area, an allochthonous one delivered by the Scheldt estuary and an autochthonous one associated with the phytoplankton spring bloom decomposition. Algorithms for CDOM retrieval will be affected if the variability in the relation between CDOM and salinity is not taken into account. <p>The optical characterisation of diatoms and P. globosa from the BCZ in pure cultures revealed that the main differences in the phytoplankton absorption spectra were found at 467 and 500 nm corresponding to the absorption of the pigments chlorophyll c3 (chl c3) characteristic of P. globosa and fucoxanthin, respectively. Accordingly, both the absorption at 467 nm and the ratio 500/467 nm were successfully used to discriminate the two taxa in cultures and field samples. This latter indicator was not preserved in the reflectance signal due to degradation of the signal when passing from absorption to reflectance, and thus could not be used for algorithm development. The spectral feature at 467 nm was later used as the basis for the development of a flag-type algorithm to detect chl c3 using either absorption or water-leaving reflectance data. Also, the correlation between the algorithm¡¦s retrieved chl c3 and P. globosa cell number allowed the quantification of the bloom. The main findings of this thesis highlight the importance of the IOPs characterisation for the improvement and development of ocean colour retrieval algorithms in these highly complex waters.<p> / Doctorat en Sciences / info:eu-repo/semantics/nonPublished