Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"POF"”.
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Climatic stability of polymer optical fibers (POF)
… verschiedenen Herstellern bezogene, Multimode- POFs aus PMMA in sieben verschiedenen Klimaten zum Einsatz. Drei dieser fünf POFs werden genauer untersucht, um den Einfluss einzelner Parameter festzustellen und optische Langzeitstabilität aufgrund von Kurzzeittests vorherzusagen. Als erstes …
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Alimentação Fora de Casa: uma análise do consumo brasileiro com dados da POF 2008-2009
… fora do domicílio no Brasil utilizando dados da POF 2008/2009. Mais precisamente, foi estimado um sistema de equações dos gastos per capita para nove categorias de alimentação fora do domicílio considerando os aspectos amostrais da POF na estimação para o Brasil e para os domicílios …
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Optimising the plastic optical fibre evanescent field biofilm sensor
… large diameter multimode plastic optical fibre (POF) sensors using evanescent field modulation. The exposed polymethylmethacrylate (PMMA) core of the POF fibre forms the sensor interface that detects refractive index changes of a measurand acting as the cladding. When a liquid measurand is used, …
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Prevalence of Premature Ovarian Failure In Women With Tuberous Sclerosis
… the human condition premature ovarian failure (POF). POF is defined in women as the cessation of menses before the age of 40 and elevated levels of follicle stimulating hormone (FSH). The prevalence of POF is estimated to be 1%, affecting a substantial number of women in the general population. …
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HEMODYNAMICS STUDIES OF THE PREOVULATORY FOLLICLE AND CORPUS LUTEUM IN CATTLE
… and blood flow of the preovulatory follicle (POF) and corpus luteum (CL) with the subsequent systemic progesterone production, and the impact of those factors on fertility, would provide information to help maximize fertility in cattle reproduction. Three studies were conducted in this …
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Imunossensor optoeletrônico para detecção de contaminação de escherichia coli na água
… study and development of plastic optical fiber (POF) immunosensors for contaminated water identification in less than an hour. Based on the immune response, the POF is functionalized with an antibody to capture bacteria and identify Escherichia coli concentrations in water. The physical principle …
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Digital Signal Processing on FPGA for Short-Range Optical Communications Systems over Plastic Optical Fiber
… As part of this trend, plastic optical fiber (POF) systems have arisen as promising candidates for applications where traditional glass optical fibers (GOF) are unsuitable. POF systems feature a series of characteristics that make them very suitable for the market requirements. More in detail, …
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Búsqueda de mutaciones en el gen foxo4 en pacientes con falla ovárica prematura no-sindrómica
… gene associated with premature ovarian failure (POF) pathogenesis. This study sequenced the coding and exon-flanking regions of this gene in a panel of 116 POF patients and 143 controls of Tunisian origin. In both groups, the IVS2 + 41T > G sequence variant was identified. It is concluded that …
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Transmission capacity improvement for high speed multimode waveguide links using advanced optical launch and multilevel modulation schemes
… namely step-index plastic optical fibre (SI-POF). Both baseband and passband multilevel modulation schemes are investigated to provide over gigabit/s transmissions using LEDs. For the first time, fractionally-spaced equalisers are thoroughly examined in multilevel modulation systems for …
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Development of an approach to incorporate proportional hazard modelling into a risk-based inspection methodology for an optimal inspection policy
… two main components: the probability of failure (PoF) and the consequence of failure (CoF). As one of these risk drivers, a more accurate estimation of the PoF will contribute to a more accurate risk assessment. Current methods to estimate the probability of failure are either time-based or …
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Utility of inbreeding coefficient and sire as predictors for osteochondrosis risk in Standardbred horses
… and those with plantar osteochondral fragments (POF) of the fetlock (n = 167). Horses with both hock OCD and fetlock POF were excluded. Inbreeding coefficients were obtained from a publically available database. Logarithmic regression analyses were conducted for each condition, with inbreeding …
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The economics of vertical coordination in the organic wheat supply chain
… companies, selling through Producer-Owned Firms (POFs) and selling directly to processors. The theory predicts that producers gain from using a POF because of savings in transaction costs and higher prices. These theorized differences in transaction costs and price are due to increased sharing of …
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Geometrical Representation, Processing, and Coding of Visual Information
… model to show that the information rates of the POF are equivalent to the information rates of the scene around it.
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Plastic optical fibre couplers with wavelength division multiplexing capability for short-range peer-to-peer communication in networking and industrial applications
… adjustable, multi-output plastic optical fibre (POF) array couplers for wavelength-division multiplexed (WDM) transmission in the visible spectrum. The research focuses on three configurations—1×2, 1×4, and 1×8—and introduces a novel architecture that allows precise control of optical power …
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A multiresolution approach for tensor completion from coarse and partial observations
… provide 65.20% and 75.79% percentage of fitness (PoF) in tensor completion with only 5% fine granular observations, which is a 27.96% relative improvement over the best baseline. To evaluate the learned low-rank factors, we also design a tensor prediction task for daily and cumulative disease case …
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Modelling and simulation of light propagation in non-aged and aged step-index polymer optical fibres
Kunststofflichtwellenleiter (POFs) stellen ein verhältnismäßig neues Medium zur optische Datenkommunikation über kurzen Strecken dar. Während ihrer Einsatzdauer unterliegen POFs unterschiedlichen Arten von Umweltbeanspruchungen, hauptsächlich durch hohe Temperatur, hohe Feuchtigkeit und …
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Demanda por alimentos na Região Metropolitana de Porto Alegre : uma aplicação do Almost Ideal Demand System
… os dados da Pesquisa de Orçamentos Familiares (POF) na Região Metropolitana de Porto Alegre (RMPA), realizada pelo Centro de Estudos e Pesquisas Econômicas (IEPE) da Universidade Federal do Rio Grande do Sul (UFRGS), em 1995, para estimar um sistema de demanda por alimentos. Implementou-se o …
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Harmonização da classificação de leguminosas e desagregação de receitas na avaliação do consumo desses alimentos no Brasil
… da Pesquisa de Orçamento Familiar (INA/POF), tendo como base a classificação FAO/WHO GIFT. Para isso, as leguminosas consumidas no INA/POF foram identificadas, descritas e classificadas. As receitas contendo leguminosas foram desagregadas e todos esses dados foram novamente harmonizados. …
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High Speed Optical Links Using CAP Modulation and Novel Equalisation Techniques
… including OM4 based and plastic optical fibre (POF) based links. An 850 nm VCSEL based OM4 link using CAP-16 scheme is studied. For the first time, the CAP equaliser, is proposed to mitigate both crosstalk channel interference (CCI) and ISI in the link at the receiver side. Performance …
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Transmission Capacity Improvement for Single Photon Avalanche Diode-based Optical Communication Using PAM Modulation
… 15 cm transmission. Plastic optical fibre (POF) has great potential for use in short reach communication, especially for home and automotive networks. Therefore, currently, the comparison of high speed, low-cost, POF links with either a large area APD, or a large array of SPADs is of …
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