we investigate the temperature-dependences of the Brillouin frequency shift in three different kind of single-mode fibers using a heterodyne method for sensing temperature. Positive dependences coefficients of 0.77, 0.56 and 1.45MHz/0C are demonstrated for 25 km long single-mode fiber, 10 km long non-zero dispersion shifted fiber and 100 m photonic crystal fiber, respectively. The results indic...

Foi na tarde de quarta-feira, no bairro das Rendeiras, Caruaru, Pernambuco, que seu Adelmo nos convidou para conhecer os seus sonhos. Eram sonhos ele construiu o neto, mas também poderiam ser meus e seus. Apesar não conseguir mudar a realidade do mundo como desejava, tenta transformar redor segurando potinho tinta com muita disposição. Como sucateiro, recolhe restos dos outras pessoas cria novo...

a type of novel hypercross-linked fiber adsorbent was obtained by sulfonation and cross-linking reaction of polypropylene fiber grafted styrene-divinylbenzene. the aim of the fiber sulfonation and cross-linking method was to prepare rigid three dimensional networks in the entire fiber and change the ion exchange capacity of fiber. the hypercross-linked fiber adsorbent possesses a principally di...

This paper deals with the effect of fiber aspect ratio of steel fibers on shear strength of steel fiber reinforced concrete deep beams loaded with shear span to depth ratio less than two using the artificial neural network technique. The network model predicts reasonably good results when compared with the equation proposed by previous researchers. The parametric study invol...

This work presents ZnO nanorods coated multimode optical fiber sensing behavior in response to ethanol solution. The sensor operates based on modulation of light intensity which arises from manipulation of light interaction with the ambient environment in sensing region. For this purpose, two steps are experimentally applied here; etching and then coating fiber with ZnO nanorods to provide stro...

Observa-se a grande quantia de adolescentes que participam das atividades da igreja evangélica com regularidade. Muitos são introduzidos à rotina desde o seu nascimento, passando por escola bíblica dominical, férias, juniores e na sequência grupo jovens. pais não medem esforços para levar seus filhos às programações, pois desejam sinceramente os mesmos sigam bom caminho. A questão é muitos acab...

ozone modification method and air-oxidation were used for the surface treatment of polyacrylonitrile(pan)-based carbon fiber. the surface characteristics of carbon fibers were characterized by x-ray photoelectron spectroscopy (xps). the interfacial properties of carbon fiber reinforced polyamide 6 (cf/pa6) composites were investigated by means of the single fiber pull-out tests. as a result, it...