Relevant bibliographies by topics / Fibre quartz

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Fibre quartz'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Fibre quartz"

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Anzivino, G., Yu Chumarovsky, A. Contin, M. Danilov, G. Dellacasa, R. DeSalvo, V. Gavrilov, et al. "Quartz fibre calorimetry — Monte Carlo simulation." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 357, no. 2-3 (April 1995): 380–85. http://dx.doi.org/10.1016/0168-9002(94)01704-2.

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Anzivino, G., Yu Chamorovskii, A. Contin, M. Danilov, G. Dellacasa, R. DeSalvo, V. Gavrilov, et al. "Recent developments in quartz fibre calorimetry." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 357, no. 2-3 (April 1995): 369–79. http://dx.doi.org/10.1016/0168-9002(94)01705-0.

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Ruotsalainen, Marjo, Maija-Riitta Hirvonen, Kirsi Luoto, and Kai M. Savolainen. "Production of reactive oxygen species by man-made vitreous fibres in human polymorphonuclear leukocytes." Human & Experimental Toxicology 18, no. 6 (June 1999): 354–62. http://dx.doi.org/10.1191/096032799678840228.

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Human polymorphonuclear leukocytes (PMNL) or erythrocytes, isolated from human blood, were exposed to graded doses of asbestos (chrysotile), quartz, or man-made vitreous fibres (MMVF), i.e. refractory ceramic fibres (RCF), glasswool, or rockwool fibres. None of the MMVF affected either the viability of PMNL, as measured by trypan blue exclusion test, or induced haemolysis, whereas the positive controls, quartz and chrysotile, dose-dependently induced haemolysis in PMNL. MMVF did not increase the release of lactate dehydrogenase (LDH) from the PMNL, whereas the positive controls, chrysotile and quartz, induced a marked and dose-dependent release of LDH. When PMNL were exposed to MMVF, some of the fibre types slightly increased the levels of free intracellular calcium ([Ca2+]i)withinthecellsina manner similar to that induced by chrysotile or quartz. All MMVF induced a dose-dependent production of reactive oxygen species (ROS) in PMNL, with RCF-induced production of ROS being the most marked. Production of ROS by MMVF seemed to depend on the availability of extracellular calcium because it could be attenuated with aCa2+ channel blocker, verapamil, or a Ca2+ chelating agent, EGTA. Production of ROS may be a common pathway through which PMNL respond to MMVF-induced cell activation, but alterations of levels of free intracellular Ca2+ do not seem to be an absolute prerequisite for this effect. Fibre length seemed not to be an important factor in affecting the ability of MMVF to induce ROS production in PMNL. However, the balance between different elements in the fibre seemed importantly to affect the biological activity of a fibre.
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Tammela, S., P. Kiiveri, and P. Pöyhönen. "Modal field transforming quartz single-mode fibre." Electronics Letters 24, no. 8 (1988): 500. http://dx.doi.org/10.1049/el:19880340.

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Vlassov, S., O. Scheler, M. Plaado, R. Lõhmus, A. Kurg, K. Saal, and I. Kink. "Integrated carbon nanotube fibre–quartz tuning fork biosensor." Proceedings of the Estonian Academy of Sciences 61, no. 1 (2012): 48. http://dx.doi.org/10.3176/proc.2012.1.06.

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Sharmila, S., and P. Chandrasekaran. "Performance evaluation of high performance concrete beams under cyclic loading." International Journal of Engineering & Technology 7, no. 1.1 (December 21, 2017): 71. http://dx.doi.org/10.14419/ijet.v7i1.1.8926.

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High performance concrete essentially consists of the same ingredients as in conventional concrete but the proportions are designed to provide the strength and durability which are needed for the structural and environmental requirements of the structure. Fiber-reinforced concrete is a concrete containing ingredients of conventional concrete and fibres which increases its structural integrity. Fibers act as crack arrester which are primarily due to plastic shrinkage and drying shrinkage. They also reduce the permeability of concrete. The main aim of the present experimental investigation is to combine different fibres namely crimped stainless steel fibre and Aramid fibre to produce HFRC and thus to evaluate its mechanical performance. In Addition Micro silica and Quartz powder is added to obtain high performance. Based on I.S. Code method of mix design, proportion of different ingredients was obtained to get M60 grade concrete. Samples were prepared by varying the volume fraction of Steelfibre and aramid fibre from 0 to 1.5%. Three specimens of Cubes, Cylinders, and Prisms for each volume fraction of fibers are casted. Mechanical properties of each concrete composite were studied. The structural parameters such as load carrying capacity, ductility characteristics and energy absorption capacity of HPHFRC beams were assessed.
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Annamaneni, Krishna Kiran, Bhumika Vallabhbhai Dobariya, and Krasnikovs Andrejs. "CONCRETE, REINFORCED BY CARBON FIBRE COMPOSITE STRUCTURE, LOAD BEARING CAPACITY DURING CRACKING." ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 2 (June 17, 2021): 232–37. http://dx.doi.org/10.17770/etr2021vol2.6655.

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Different authors conducted studies on fiber reinforced concretes (FRC) with carbon fibres of different lengths and some results showed that concrete mix with homogeneously distributed short fibres in their volume have good strength and ultra-strain compared to normal plain concrete mix. However, this study is focused more on 3-dimensional (3D) carbon fibre reinforced plastic (epoxy) CFRP composite thin rods frame used as a reinforcement in concrete which shows good increase in loadbearing and ductility. Were investigated concrete mixes with superplasticizer, nano-silica, quartz sand, fine natural sand and gravels. Diagonal cross bracing carbon fibre epoxy frames were used as a reinforcement giving better ductility results. Proposed study approach is to show that the reinforced concrete with provided materials have an increased performance in terms of ductility, sustainability, and load bearing in cracked statement. Total, four groups of concrete and each group with three beams were casted and tested in this experiment, three groups with three different shapes of carbon frames and three beams without frames to compare the mechanical properties after 28 days. Failure mechanisms in any particular case were analysed.
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Eichler, H. J., J. Kunde, and B. Liu. "Quartz fibre phase conjugators with high fidelity and reflectivity." Optics Communications 139, no. 4-6 (July 1997): 327–34. http://dx.doi.org/10.1016/s0030-4018(97)00135-1.

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Seyam, Ahmed Maher, Samir Shihada, and Rita Nemes. "Effects of polypropylene fibers on ultra high performance concrete at elevated temperature." Concrete Structures 21 (2020): 11–16. http://dx.doi.org/10.32970/cs.2020.1.2.

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This paper presents an experimental study to evaluate the influence of polypropylene on fire resistance of ultra-high performance concrete (UHPC). Concrete mixtures are prepared by using different percentages of polypropylene fibres 0%, 0.75% and 1.5%, by volume. Samples are heated to 250 or 500 °C, for exposures 2.5 or 5 hours, and tested after cooling for compressive strength and flexural tensile strength. The research includes the use of mineral admixture of a recognized, polypropylene fibre, quartz sand, superplasticizers and without using any type of aggregates other than the quartz sand. The effect on subjected samples to elevated temperature up to 250 ºC and 500 ºC for durations 2.5 hours and 5 hours was studied for each mix and comparing the results of compressive strength and tensile strength among the mixes. Results obtained, showed that adding 0.75% of polypropylenes fibres only to a concrete mixture, improved the fire resistance of the concrete by 27% and 72% when the samples exposed to 250 ºC and 500 ºC for 2.5 hours respectively, compared with concrete mixes without fibres. In addition, the residual strength was improved by 39% and 14% when the samples exposed to 250 ºC and 500 ºC for 5 hours, respectively.
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Vearncombe, J. R. "Structure of veins in a gold–pyrite deposit in banded iron formation, Amalia greenstone belt, South Africa." Geological Magazine 123, no. 6 (November 1986): 601–9. http://dx.doi.org/10.1017/s0016756800024110.

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AbstractFibrous quartz veins in deformed banded iron formation of the Amalia greenstone belt, southwestern Transvaal, are spatially related to gold–pyrite mineralization in both wallrock and vein inclusions. Poles to quartz vein orientations show a general parallelism with mineral elongation and fold plunges of the principal deformation in the wallrock. Quartz vein fibres show a consistent anticlockwise rotation, late components being subparallel to the elongation lineation, suggesting veining was probably synchronous with the principal deformation. Antitaxial fibrous veins, which dominate the mineralized banded iron formation, formed by the process of crack–seal which channelled mineralizing fluids along the vein walls, increasing the potential for fluid–wallrock interaction. Gold mineralization in quartz veins occurs in wall-parallel slivers of banded iron formation which have been plucked off the vein wall during antitaxial fibre growth. Mineralization can be explained by a process of fluid–wallrock interaction with sulphidation and gold precipitation.
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Dissertations / Theses on the topic "Fibre quartz"

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Kamenopoulou, Vassiliki. "Proprietes dosimetriques des fibres textiles : application a la dosimetrie par resonance paramagnetique electronique d'un accident d'irradiation gamma." Toulouse 3, 1987. http://www.theses.fr/1987TOU30172.

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Tison, Guillaume. "Étude, réalisation et applications d’une chaîne amplificatrice laser compacte pour l’allumage de turbomoteurs." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14779/document.

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Ce travail porte sur l’étude et la réalisation d’une cellule d’allumage laser pour turbomoteurs. Une étude bibliographique nous a permis d’identifier les caractéristiques nécessaires : des impulsions nanosecondes d’au moins 10mJ. La spécificité de l’application impose de nombreuses contraintes qui ont influencé le choix d’une architecture avec deux étages amplificateurs : un amplificateur fibré suivi d’un amplificateur à base de fibre cristalline. Nous avons développé un code permettant de simuler l’amplification d’une impulsion nanoseconde dans ces milieux et ainsi déterminé les caractéristiques techniquesoptimales de chaque étage amplificateur. Ces résultats ont permis la réalisation d’une chaîne d’allumage et sa caractérisation. Une étude particulière del’amplificateur fibré a permis de maîtriser l’apparition d’effets non-linéaires limitants. Finalement, nous démontrons le potentiel de notre solution laserpar plusieurs campagnes d’allumage sur différents bancs moteurs
This work deals with the design and the construction of a laser ignitionsystem for turbine engines. A review of the dedicated literature allowed us toidentify the required characteristics : nanosecond pulses with at least 10 mJ ofenergy. Our specific application imposes numerous constraints which directlyinfluenced our choice of two amplifier stages : a fiber amplifier followed by acrystalline-fiber based amplifier. We developped a simulation describing theamplification of nanosecond pulses through these two medias and thus de-termined the optimal technical characteristics of each amplifier stage. Theseresults lead to the realization of an laser ignition system that we completelycharacterised. A specific study of the fiber amplifier allowed us to understandand control the appearance of non-linear limiting phenomena. Eventually, wedemonstrate the capabilities of our solution by several laser-ignition field stu-dies
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Ayan, Ahmet Sedat. "The CMS forward calorimeter prototype design studies and omega(c)0 search at E781 experiment at FermiLab." Diss., University of Iowa, 2004. http://ir.uiowa.edu/etd/116.

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LAZIC, DRAGOSLAV. "Etude et mise au point d'un nouveau principe de calorimetre employant des fibres optiques en quartz." Université Louis Pasteur (Strasbourg) (1971-2008), 1993. http://www.theses.fr/1993STR13133.

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La future generation des experiences en ions lourds de haute energie et les collisionneurs hadroniques a haute energie (rhic, lhc, ssc) demandent des calorimetries tres rapides et resistants aux radiations. Dans cette these, l'etude des fondements d'une nouvelle technique de calorimetre est presentee. Notre approche est de detecter la lumiere cherenkov produite par des particules de gerbes traversant des fibres optiques en quartz noyees dans un absorbeur en plomb. Ce choix a ete motive par la rapidite de l'effet cherenkov et la bonne tenue du quartz aux radiations. Deux prototypes ont ete construits et testes et leur comportement compare avec les resultats de simulation. Les resultats les plus importants sont: 1) une bonne tenue aux radiations jusqu'a (au moins) 3 grad; 2) une reponse tres rapide (la duree totale des impulsions est inferieure a 10 ns); 3) une bonne resolution en energie est possible avec un choix judicieux de la densite des fibres; 4) la dimension transversale de la gerbe hadronique effective est tres petite (moins d'un cm), ce qui donne une tres haute resolution spatiale du calorimetre. La possibilite d'utilisation de cette technique pour les calorimetres tres en avant dans les experiences aupres des collisionneurs est demontree et les possibilites d'amelioration de la technique ont ete discutees
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Menezes, Murilo de Sousa. "Protocolo de tratamento de superficie de pino de fibra de quartzo com H2O2." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289703.

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Orientador: Luis Roberto Marcondes Martins
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo deste estudo foi avaliar a resistência de união entre pinos de fibra de quartzo e resina de preenchimento, preliminarmente em função do uso do silano isoladamente e silano associado ao adesivo. Em seguida, em função do condicionamento de superfície do pino com peróxido de hidrogênio (H2O2), variando a concentração (24 e 50%) e o tempo de aplicação (1, 5 e 10 min). Propôs-se também, avaliar qualitativamente, por meio de Microscopia Eletrônica de Varredura (MEV), a morfologia de superfície dos pinos tratados com H2O2 em diferentes protocolos de aplicação, comparativamente ao pino sem nenhum tratamento de superfície. Para avaliar a resistência de união 80 pinos de fibra de quartzo (AESTHETI-PLUS, Bisco) foram divididos, aleatoriamente, em oito grupos (n=10): inicialmente, foram testados (G1) tratado apenas com silano e (G2) tratado com silano e adesivo, para definição do grupo controle. Os grupos experimentais (G3) tratado com H2O2 a 24% por 1 min; (G4), H2O2 a 24% por 5 min; (G5), H2O2 a 24% por 10 min; (G6), H2O2 a 50% por 1min; (G7), H2O2 a 50% por 5 min e (G8), H2O2 a 50% por 10 min. Em seguida, todos os grupos experimentais receberam aplicação de uma camada de silano (PORCELAIN PRIMER, Bisco) e outra de adesivo (ALL BOND 2, Bisco). Em seguida as restaurações em resina composta (CORE-FLO, Bisco) foram simuladas utilizando moldes de silicones. Após 24h de armazenagem em água a 37ºC, as amostras foram submetidas a cortes seriados, perpendiculares ao longo eixo do pino, obtendo amostras com dimensões de aproximadamente 1x1mm, com formato de palito e constituída por resina/pino/resina. As amostras foram submetidas ao ensaio mecânico de microtração à velocidade de 0,5 mm/min até o rompimento dos espécimes. Para análise em MEV, 14 pinos foram divididos em sete grupos (n=2): G1 (controle) sem tratamento nenhum; e os outros seis grupos receberam o mesmo tratamento de superfície com H2O2 correspondente as amostras do ensaio de microtração, entretanto, sem aplicação de silano e adesivo. Os dados de resistência de união apresentaram distribuição normal e homogênea e foram submetidos ao teste t-Student para comparar o grupo G1 ao G2. Os resultados mostraram que G2 apresentou valor de resistência de união significantemente superior ao G1, sendo então considerado como controle para posterior comparação aos grupos experimentais. Em seguida, para comparar entre si os grupos tratados com H2O2, foi aplicada análise de variância fatorial ANOVA (3x2). Foi também realizado Post Hoc Tests Dunnett, para comparação do grupo controle (G2) aos grupos experimentais (tratados com H2O2) em análise de fator único. Os resultados demonstraram que os grupos experimentais apresentaram valores de resistência de união semelhantes entre si e superiores ao controle (G2). As imagens de MEV demonstraram que o tratamento de superfície com H2O2 remove parcialmente a resina epóxica dos pinos expondo as fibras de quartzo. Conclui-se que o H2O2 altera a morfologia de superfície dos pinos de fibra de vidro e aumenta a resistência de união entre o pino e resina de preenchimento.
Abstract: Coupling of fiber posts to composites is hampered by absence of chemical union between epoxy-based resins. This study analyzed the effect of surface treatments of glass fiber posts on bond strength to resin cores. A total of 94 fiber posts (AESTHETI-PLUS, Bisco) were randomly divided into eight groups, according to the surface pre-treatments performed (n=10): (G1), silanization; (G2), silanization and adhesive. Six experimental groups: (G3) 24% hydrogen peroxide (H2O2) for 1 min; (G4), 24% H2O2 for 5 min; (G5), 24%H2O2 for 10 min; (G6), 50% H2O2 for 1min; (G7), 50% H2O2 for 5 min and (G8), 50% H2O2 for 10 min. This was followed by silanization (PORCELAIN PRIMER, Bisco) of the exposed quartz fiber to enhanced their chemical bonding to core composite and application of bonding agent (ALL BOND 2, Bisco). Two posts of each experimental group and two posts without the treatment were investigating the morphologic aspect surface post. The composite resin (CORE-FLO, Bisco) was used for the core build-up in ten remaining posts of each group. The samples were cut so as to obtain microtensile sticks that were loaded in tension at cross-heat speed of 0,5mm/min until failure. Data were statistically analyzed. SEM examination showed pretreatment with H2O2 modifying the fiber post surface. The post-core strengths achieved in G2 were significantly higher, that G1. The experimental groups G3, G4, G5, G6, G7 and G8 were similar and significantly higher, that G2. In conclusion the adhesive and silane enhanced the interfacial strength between them and core material. The hydrogen peroxide modified the surface morphology of fiber post and also significantly enhanced the interfacial strength between them and core material.
Doutorado
Dentística
Doutor em Clínica Odontológica
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Basa, Stéphane. "Recherche des gluinos et des squarks dans le cadre du modèle supersymétrique minimal au LHC : étude des performances d'un prototype de calorimètre électromagnétique plomb/fibres scintillantes." Aix-Marseille 2, 1994. http://www.theses.fr/1994AIX22026.

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Au cours de cette these, differents problemes lies a la preparation des experiences aupres du lhc ont ete abordes. La premiere analyse a permis d'etudier un large eventail des performances d'un prototype de calorimetre electromagnetique plomb/fibres scintillantes. Les resultats ont ete conformes a nos esperances. La seconde analyse a ete dediee a a recherche des gluinos et des squarks prevus par le modele supersymetrique minimal. On a pu montrer que le bruit de fond multijets dans le canal energie manquante plus jets etait negligeable. Par ailleurs, en demandant deux leptons de meme signe on a pu montrer que des gluinos d'une masse au plus egale a 1. 3 tev etaient detectables. Finalement, une methode pour determiner la relation entre les masses des gluinos et des squarks a ete proposee
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Vedadi, A. "Etude et applications des amplificateurs paramétriques à fibre optique." Phd thesis, Université de Franche-Comté, 2008. http://tel.archives-ouvertes.fr/tel-00544865.

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Depuis l'avènement en Perse, il y a 2500 ans, du service postal, la capacité à transmettre un maximum d'information sur une longue distance et en un minimum de temps s'avère être une des quêtes de l'Homme. Aujourd'hui, les moyens de télécommunications modernes font parti de notre quotidien et nous permettent de partager quasi-instantanément de la voix, de l'image ou du texte avec un interlocuteur situé à des milliers de kilomètres. Le cadre général dans lequel s'insère ce manuscrit de thèse est celui de l'étude de la couche physique des télécommunications, mais de façon plus précise, celui de la recherche d'outils de traitement tout-optique de l'information destinés particulièrement aux futurs systèmes de transmission à à très haut débit. En effet, de nombreuses recherches ces dernières années ont montré la variété d'applications possibles à partir de l'amplification paramétrique, une nouvelle technique d'amplification sur fibre optique offrant une très grande bande passante. Nous présentons dans ce manuscrit une étude théorique des amplificateurs paramétriques utilisant deux lasers de pompe. Nous analyserons également le bruit et la distorsion des signaux de télécommunications apporté par la modulation de phase des pompes, requise pour supprimer la rétro-diffusion Brillouin stimulée dans toute fibre optique. Nous donnerons la démonstration théorique que deux ondes pompes modulées en opposition de phase annulent toute distorsion des signaux. Nous présenterons également une mise en oeuvre expérimentale d'un amplificateur paramétrique optique, intégrant un nouveau modulateur de phase double réalisé en partenariat avec la société Photline Technologies. Celui-ci nous a permis de démontrer une qualité d'amplification optique ainsi qu'une conversion de longueur d'onde quasi-transparente. La troisième partie présente ce qui constitue, à notre connaissance, la première mesure distribuée du gain paramétrique le long de la fibre optique servant de milieu amplificateur. Ces travaux ont été réalisés en collaboration avec l'Ecole Fédérale Polytechnique de Lausanne (EPFL), en Suisse. Ils sont basés sur l'analyse Brillouin dans le domaine temporel. La quatrième et dernière partie de ce manuscrit relate une étude théorique et numérique d'une boucle à réplication d'impulsion laser intégrant un amplificateur paramétrique. Ces travaux ont été réalisés dans le cadre d'un contrat avec le Commissariat à l'Energie Atomique (CEA). L'originalité de cette étude réside dans l'exploitation des amplificateurs paramétriques dans la fenêtre de longueurs d'ondes autour de 1 μm en utilisant des fibres à cristal photonique.
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Lima, Júnior Ubirajara Marques. "Fibras da semente do açaizeiro (Euterpe Oleracea Mart.): avaliação quanto ao uso como reforço de compósitos fibrocimentícios." Pontifícia Universidade Católica do Rio Grande do Sul, 2007. http://hdl.handle.net/10923/3384.

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The present work investigates for the first time the possibility of using vegetable fibers originated from the açaí pulp extraction, fruit of Euterpe oleracea, as an alternative material for the construction sector. This study comprised studies related to the determination of fiber properties such as morphology and physicochemical properties, to composites manufacturing by different fiber rates in Portland cement matrixes, besides the evaluation of properties of the final material, such as physical properties (specific gravity, apparent porosity and water absorption) and mechanical tests (compressive, flexural and split strength tests) evaluating the better fiber rate in the specimens produced. The cement based composite reinforced with açaí fiber did not present a significant decrease on compressive strength. Besides, these fibers increased the tensile strength (approximately 13% in average) the fibrocement materials produced with this reinforcement. The proposed reinforcement presented a good performance regarding adhesion to the matrix and consequently post-crack behavior inherent to fibrocement, strengthening the region near the fracture. Composite materials reinforced with non-treated açaí fiber presents good mechanical properties. In all, the açaí fibers, which may be obtained at near zero cost, showed the potential to be used in cement matrixes as a reinforcement providing an adequate mechanical performance and reducing the cost of the final product. Besides, the use of these fibers may be beneficial to families responsible for their extraction and preliminary treatment, and therefore social and economical aspects are also involved if new applications are found for the açaí fibers.
O presente trabalho investiga pela primeira vez a possibilidade de utilização de fibras vegetais oriundas do subproduto da extração da polpa de açaí, fruto da estirpe Euterpe oleracea, como material alternativo para o setor de construção civil. O estudo envolveu aspectos relacionados à determinação de propriedades da fibra tais como morfologia e propriedades físico-químicas, à produção de corpos-de-prova com diferentes teores de fibra, além de ensaios físicos (massa específica, porosidade aparente e absorção de água) e mecânicos (ensaios de compressão axial, de tração na flexão e de tração por compressão diametral) para avaliação de desempenho do material final, bem como a proporção mais adequada de fibra em relação ao cimento Portland dentre os traços ensaiados. Os compósitos cimentícios reforçados com fibras de açaí não apresentaram perda significativa de resistência à compressão. Além disso, as fibras incrementaram de forma satisfatória a resistência à tração (aproximadamente 13% em média) de fibrocimentos produzidos com este reforço. O reforço proposto apresentou um bom desempenho de adesão com a matriz e conseqüente comportamento pós-fissura inerente aos fibrocimentos, reforçando a região adjacente à fratura. Compósitos reforçados com fibra de açaí in natura apresentaram boas propriedades mecânicas. Portanto, as fibras de açaí, material disponibilizado a custo zero, são passíveis de aplicação como reforço de matrizes cimentícias, proporcionando um bom desempenho mecânico e reduzindo o custo do produto final, devido ao valor das fibras incorrer somente no seu beneficiamento, que pode ser manual e inserido em contexto social.
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Silva, Junior Fabio Vieira da. "Remoção de hidrocarbonetos policíclicos aromáticos por substratos sólidos estudos com amberlite XAD-2, polietileno, poliuretano, sílica e fibra de quartzo." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/10559.

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Polycyclic aromatic hydrocarbons (PAHs) are a class of compounds characterized by having two or more condensed aromatic rings. These substances, as well as their nitrated and oxygenated derivatives, can be found widely spread as constituents of complex mixtures in the environment. A variety of PHAs, in many cases showing similar structures, can be found in the environment. The United States Environmental Protection Agency (U.S. EPA) has listed 16 PAHs based on their toxicological profiles, as priority pollutants. In the present study, the performance of the solid substrates Amberlite XAD-2, polyethylene, high-density polyurethane foam, silica gel and quartz fiber were investigated as alternative to XAD-2 to remove HPAs from solutions. The investigation of the adsorption of naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene and chrysene was conducted in aqueous solutions by batch experiments, considering the initial concentrations of substrates and PHAs, time, temperature and influence of cosolvency. Spectrophotometry and liquid chromatography with UV detection were used to assess the removal yield. The results showed that the yields of PAH strongly dependent on the substrate as well as the PHA. The PAHs were most quickly and almost totally (except chrysene and anthracene) removed by polyurethane foam. High density polyethylene behaves similarly to XAD-2. Among the investigated PHAs, chrysene showed a different behavior, since the best adsorbents for this compound were as silica gel and quartz fiber. Thus the personal samplers for PHAs must be prepared as a mix of adsorbents instead of having a unique composition.
Hidrocarbonetos policíclicos aromáticos (HPAs) fazem parte de uma classe de compostos caracterizados por terem dois ou mais anéis aromáticos condensados. Estas substâncias, assim como seus derivados nitrados e oxigenados, podem ser encontradas difundidas como componentes de misturas complexas no ambiente. Uma variedade de HPAs, que em muitos casos, mostram estruturas semelhantes, pode ser encontrada no meio ambiente. A Agência de Proteção Ambiental dos Estados Unidos (U.S EPA) listou 16 HPAs com base em seus perfis toxicológicos, como poluentes prioritários. No presente estudo, o desempenho do substrato de Amberlite XAD-2, polietileno de alta densidade, espuma de poliuretano, sílica gel e fibra de quartzo foram investigados como alternativa ao XAD-2 para remover HPAs a partir de soluções. O estudo da adsorção do naftaleno, acenaftileno, acenafteno, fluoreno, fenantreno, antraceno e criseno foi realizado em soluções aquosas através de experimentos em batelada, avaliando a influência das concentrações iniciais dos HPAs e substratos, tempo, temperatura e efeito do co-solvente. Espectrofotometria e cromatografia líquida com detecção por UV foram utilizados para avaliar o rendimento de remoção. Os resultados mostraram que os rendimentos são fortemente dependentes do substrato, bem como dos HPAs. Os HPAs foram mais rapidamente e quase totalmente removidos por espuma de poliuretano (exceto criseno e antraceno). O polietileno de alta densidade apresenta um comportamento semelhante ao de XAD-2. Entre os HPAs investigados, criseno apresentou um comportamento diferente, uma vez que os melhores adsorventes para este composto foram à sílica gel e a fibra de quartzo. Assim, os amostradores pessoais para HPAs devem ser preparados como uma mistura de adsorventes em vez de ter uma composição única.
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Soares, Leandro Passos. "Influência de diferentes métodos de condicionamento superficial em pinos pré-fabricados resinosos fibro-reforçados em vidro e quartzo na resistência adesiva a compósito de polimerização dual: teste de push-out." Universidade do Estado do Rio de Janeiro, 2012. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3504.

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O objetivo deste estudo foi realizar uma avaliação tridimensional da rugosidade superficial em 3 tipos de pinos de fibra - DT LightPost, FRC Postec Plus e Transluma Post - submetidos a diferentes tratamentos de superfície e avaliar os efeitos dos pré-tratamentos na resistência adesiva a um compósito de presa dual Biscore. Os tratamentos de superfície foram: imersão em ácido hidrofluorídrico, jateamento com óxido de alumínio a 50m, imersão em peróxido de hidrogênio, jateamento com óxido de alumínio a 50m seguido de imersão em ácido hidrofluorídrico e jateamento com óxido de alumínio a 50m seguido de imersão em peróxido de hidrogênio. No experimento 1, 75 pinos foram divididos em 3 grupos (n = 25), de acordo com seu fabricante e subdivididos em cinco subgrupos. A rugosidade superficial foi medida usando um rugosímetro tridimensional e analisada com o software de análise 3D. Os valores de rugosidade foram obtidos antes e após diferentes tratamentos de superfície na área dos mesmos corpos-de-prova. Para o experimento 2, foram utilizados os mesmos corpos-de-prova, os mesmos grupos e subgrupos do experimento 1, tendo sido adicionado o subgrupo de controle (n=90) e a resistência adesiva a um compósito presa dual Biscore foi mensurada através de um teste push-out. A resistência adesiva foi medida em uma máquina universal de ensaios, com uma célula de carga tipo SLBL-5kN em uma velocidade de 0,5 mm / min. Os resultados do experimento 1 foram analisados através de um teste estatístico t-Student. Jateamento e jateamento seguido de imersão em ácido hidrofluorídrico produziram um aumento estatisticamente significante na rugosidade, contudo somente o tratamento por jateamento proporcionou um aumento significativo nos valores de rugosidade. Os resultados do experimento 2 foram obtidos através de um um teste t-unilateral de hipótese com variância desconhecida. Concluiu-se que o jateamento com óxido de alumínio a 50μm em uma distância de 30 mm a 2,5 bar de pressão por 5 segundos foi suficiente para modificar a topografia dos pinos de fibra de vidro e quartzo e que o jateamento com partículas de 50 μ alumina a distância de 30 mm a 2,5 bar de pressão por 5 segundos foi o único tratamento de superfície que aumentou a resistência adesiva do compósito Biscore aos pinos DT Light Post e Transluma Post. Os pinos FRC Postec Plus não demostraram um aumento estatisticamente significante na resistência adesiva em nenhum grupo.
The aim of this study was to perform a tridimensional surface roughness test evaluation of different surface treatments to 3 types of fiber posts - DT LightPost, FRC Postec Plus e Transluma Post - and evaluate the effects of the different pretreatments on the bond strength of a dual-cure resin core material Biscore. The different surface treatments were: immersion in hydrofluoric acid, sandblasting abrasion with 50 alumina particles, immersion in hydrogen peroxide, sandblasting abrasion with 50 alumina particles followed by immersion in hydrofluoric acid and sandblasting abrasion with 50 alumina particles followed by immersion in hydrogen peroxide. In the first experiment seventy five fiber posts were divided into 3 groups (n = 25), according to their manufacturer and subdivided into 5 subgroups. Surface roughness was measured using a tridimensional surface roughness test and analyzed with 3D analysis software. Surface roughness was obtained before and after the different surface treatments at the same post area. In the second experiment the same samples divided in groups and subgroups were used, but a control group (no treatment) was added (n = 90) and the bond strength to a composite resin core material Biscore was measured using a push-out design. The interfacial push-out bond strength was measured in a universal testing machine, with a load cell type SLBL-5kN at a crosshead speed of 0.5 mm/min. Results in experiment 1 were statistically analyzed using Students t-Test. Sandblasting and sandblasting followed by immersion in hydrofluoric acid produced a significant increase in roughness, but the sandblasting treatment was able to provide a significant roughness increase. Results in experiment 2 were statistically analysed using one-sided t-Test of Hypothesis with unknown variance. It was concluded that sandblasting airborne-particle abrasion with alumina 50 at a distance of 30 mm at 2.5 bars pressure for 5 seconds was sufficient to modify the surface topography of glass and quartz fiber posts and the sandblasting abrasion with 50 alumina particles at a distance of 30 mm at 2.5 bars pressure for 5 seconds was the only surface treatment in DT Light Post and Transluma Post that increased the bond strength to dual cure resin composite cores. FRC Postec Plus post did not shown an increase in bond strength in any group.
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Books on the topic "Fibre quartz"

1

Luz, Adão Benvindo da. Tecnologia do caulim: Ênfase na indústria de papel. Rio de Janeiro, RJ: CETEM, Ministério da Ciência e Tecnologia, 2000.

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Luz, Adão Benvindo da. Tecnologia do caulim: Ênfase na indústria de papel. Rio de Janeiro, RJ: CETEM, Ministério da Ciência e Tecnologia, 2000.

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Smedley, Julia, Finlay Dick, and Steven Sadhra. Chemical hazards. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199651627.003.0002.

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Chemical hazards: classification and labelling 42Chemical hazards, sampling and analysis methods 44Particles, fibres, fumes, and mistsCoal dust 49Cotton dust 50Flour dust 51Grain dust 52Wood dust 53Crystalline silica (quartz) 54Asbestos 55Machine-made mineral fibre 56Diesel engine exhaust emissions ...
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Rehabilitation after the Quartz Gulch Fire. [S.l: s.n., 2001.

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United States. Bureau of Land Management. Medford District, ed. Rehabilitation after the Quartz Gulch fire. [Medford, OR]: U.S. Dept. of the Interior, Bureau of Land Management, Medford District, 2001.

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Carroll, Sean M., and Thomas Lin. Alice and Bob Meet the Wall of Fire: The Biggest Ideas in Science from Quanta. MIT Press, 2018.

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Alice and Bob Meet the Wall of Fire: The Biggest Ideas in Science from Quanta. The MIT Press, 2018.

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Carroll, Sean M., and Thomas Lin. Alice and Bob Meet the Wall of Fire: The Biggest Ideas in Science from Quanta. MIT Press, 2018.

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Carroll, Sean M., Thomas Lin, and Thomas Linacre. Alice and Bob Meet the Wall of Fire: The Biggest Ideas in Science from Quanta. MIT Press, 2018.

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Willamette National Forest (Or.) and Oregon. Dept. of Forestry., eds. Coordinated public use restrictions: South Santiam, Quartz Creek and Hills Creek areas : a guide to understanding public use restrictions on private and national forest lands during fire season. [Oregon]: Willamette National Forest, 1993.

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Book chapters on the topic "Fibre quartz"

1

Visco, Anna Maria, L. Calabrese, Nino Campo, A. Bonavita, and Lorenzo Torrisi. "Pull-Out Strength Analysis of Quartz Fibre Posts in Dental Implants." In Advances in Science and Technology, 130–35. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-05-2.130.

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Gooch, Jan W. "Quartz Fiber." In Encyclopedic Dictionary of Polymers, 602. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9687.

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Passonneau, Janet V., and Oliver H. Lowry. "The Quartz Fiber Fishpole Balance." In Enzymatic Analysis, 337–51. Totowa, NJ: Humana Press, 1993. http://dx.doi.org/10.1007/978-1-60327-407-4_11.

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Sen, A., Biswanath Doloi, and B. Bhattacharyya. "Analysis of Fiber Laser Micro-drilling on Quartz." In Lecture Notes in Mechanical Engineering, 273–79. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1307-7_30.

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Adamis, Zoltán, Erzsébet Tátrai, Miklós Timár, and György Ungváry. "Significance of Surface Properties of Quartz and Quartz-Containing Mineral Dusts to the Pulmonary Toxicity." In Cellular and Molecular Effects of Mineral and Synthetic Dusts and Fibres, 381–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-79041-6_38.

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Suda, Masamichi, Toru Takahashi, Akio Hattori, Akihiko Goto, and Hiroyuki Hamada. "Analysis of Blowing in Quartz Glass Fire Process." In Advances in Ergonomics of Manufacturing: Managing the Enterprise of the Future, 47–58. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41697-7_5.

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Xiang, Yan, Weiwei Chen, Huanwu Cheng, Aiming Bu, and Yongfu Zhang. "Surface Plasma Modification and Coating Properties of Quartz Fiber." In Springer Proceedings in Physics, 77–84. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5947-7_9.

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Meng, Yang, Weiwei Chen, Huanwu Cheng, and Yuping Zhang. "Surface Modification of Quartz Fiber by Aqueous Plasma Electrolysis." In Advanced Functional Materials, 775–80. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_85.

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Suda, Masamichi, Toru Takahashi, Akio Hattori, Akihiko Goto, and Hiroyuki Hamada. "Educational Effect Using Expert Model in Fire Process of Quartz Glass." In Advances in Intelligent Systems and Computing, 105–12. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60018-5_11.

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Wang, Lei, Yu Dong Huang, and Li Liu. "High Temperature Mechanical Property of Al2O3 Coated Quartz-Fiber Reinforced Methyl Silicon Resin Composites." In Composite Materials V, 135–41. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-451-0.135.

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Conference papers on the topic "Fibre quartz"

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Mallalieu, Kim, Robert Youngquist, D. E. N. Davies, and G. F. Jones. "An Analysis Of The Photothermal Drive Of A Quartz Force Sensor." In Fibre Optics '85, edited by Lionel R. Baker. SPIE, 1985. http://dx.doi.org/10.1117/12.946244.

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Spooncer, Ron C., Barry E. Jones, and Rioji Ohba. "A Pulse Modulated Optical Fibre Quartz Temperature Sensor." In Hague International Symposium, edited by Anna M. Verga Scheggi. SPIE, 1987. http://dx.doi.org/10.1117/12.941097.

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Fujiwara, Eric, Egont A. Schenkel, Murilo F. M. Santos, and Carlos K. Suzuki. "Concentration measurements in silica and quartz nanofluids by optical fiber sensor." In International Conference on Optical Fibre Sensors (OFS24), edited by Hypolito J. Kalinowski, José Luís Fabris, and Wojtek J. Bock. SPIE, 2015. http://dx.doi.org/10.1117/12.2193188.

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Moceiki, Rimvydas, Asta Kičaitė, and Gintautas Skripkiūnas. "Effect of aggregate particle shape and granulometry on the workability and mechanical properties of glass reinforced concrete." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.002.

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Modern alkali resistant glass fibers (ARG) modified with 17% ZrO2 are getting more popular as reinforcement of cementitious matrixes. Typical matrix compositions with quartz, Portland cement, 13 mm length ARG glass fibres and PCE superplasticizer can offer good workability, product quality and highly increased mechanical characteristics. In production of self compacting fibre reinforced premix highly siliceous fine sands with nearly round shape particles are usually preferred. This article investigates influence of particle shape for workability of glass fibre reinforced concrete when alternative fillers- crushed granite and regular sand are used. 12 compositions were made whith different quantities of fillers, changing quartz from 0% to 50% with alternative aggregates. Slump tests according to EN 1170-1 were made and showed major impact of particle shape characteristics on mix workability. When quantity of altrernative aggrates was increased, slump of fresh mix decreased and fibre- matrix segregation occurred. New workability factor W is offered and values calculated, to have numeric representation of workability. Alternative aggregates had no clear influence for flexural strenght, when beams 40×40×160 were tested. Compressive strength dropped by 25% when regular sand was used. Typical quartz matrix resulted in lower water absorbtion.
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ULYANOV, A. "TEST BEAM RESULTS OF THE CMS FORWARD QUARTZ FIBRE CALORIMETER." In Proceedings of the 9th Conference. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773678_0069.

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Tarasov, D. A., I. A. Ovchinnikova, G. I. Meschanov, V. N. Gordienko, and A. Y. Tsym. "Quartz-glass Optical Fibre Time to Fracture at Small Bending Radiuses." In 2020 Systems of Signals Generating and Processing in the Field of on Board Communications. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf48371.2020.9078607.

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Fu, Xinghu, Jing Wen, Fan Liu, Chuanqing Yang, Shunyang Zhang, Siwen Wang, Jiangpeng Zhang, Dong Wang, Guangwei Fu, and Weihong Bi. "A Curvature Sensor Based on Tapered Triple Cladding Quartz Specialty Fiber." In 2017 2nd International Conference for Fibre-optic and Photonic Sensors for Industrial and Safety Applications (OFSIS). IEEE, 2017. http://dx.doi.org/10.1109/ofsis.2017.14.

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Almeida, Francielly S., Gustavo T. Laureano, Leandro A. Freitas, and Sand L. Correa. "Desenvolvimento de uma Aplicação para Escritórios Inteligentes Usando a Plataforma FIWARE e o ambiente FIWARE-Lab@RNP." In Workshop do Testbed FIBRE. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/fibre.2021.15766.

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Este trabalho apresenta os resultados de um estudo comparativo envolvendo a FIWARE, uma plataforma de desenvolvimento de aplicações de Internet das Coisas (IoT), e o FIWARE-Lab@RNP, um laboratório virtual e remoto para prototipação e experimentação de aplicações IoT baseadas na plataforma FIWARE. O objetivo principal do FIWARE-Lab@RNP é facilitar a criação, configuração e gerenciamento de implantações FIWARE, disponibilizando instâncias da plataforma de forma transparente e sem a necessidade de conhecer especificidades dos principais componentes e serviços da plataforma. O estudo apresenta uma visão prática e tem como objetivo mensurar o quanto um ambiente, com as características apresentadas pelo FIWARE-Lab@RNP, diminui o esforço de desenvolvimento de aplicações IoT baseadas na plataforma FIWARE. Para atingir esse objetivo, desenvolvemos uma aplicação piloto de IoT, no contexto de Escritórios Inteligentes, diretamente na plataforma, como também através dos recursos providos pelo FIWARE-Lab@RNP.
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Suda, Masamichi, Peng Qiu, Toru Takahashi, Akio Hattori, Yuqiu Yang, Akihiko Goto, and Hiroyuki Hamada. "Process Analysis of Expert and Non-Expert Engineer in Quartz Glass." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38059.

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Quartz glass is a special glass material known as “King of Glass”. The silicon purity of the quartz glass is very high, therefore it is excellent in heat resistance, chemical resistance and optical transparency as compared to other glasses, such as borosilicate glass. At present, it is used in the production field of leading-edge. Now researches are carried out to develop it as key components of special manufacturing equipment, scientific instruments and analysis equipment that require high-precision, high purity, the high light transmittance. However, due to its high heat resistance, it is difficult to be processed into various shapes. As a result, manufactured quarts glass products, generally, might be different even in one batch. To respond to such products for precision instruments, it is preferable to select the heat molding process by flame called “fire-process” in many cases. “fire-process” is the process of forming a softening point of heated quartz glass material by a mixed combustion flame of hydrogen and oxygen. Therefore, a technique for forming a glass material softened by heating is required, and now it is done by human hand processing of engineers. While skilled human technique of long time experience is required in order to produce high precision and an efficient products. Therefore digitizing and analysis of the work of expert engineers with high level of hand skill is needed to increase the processing technology of the engineers less skilled and take advantage in the manufacture of high-precision products. In this study, the differences in the working process between engineers with different years of experience during the “fire-process” of quartz glass material were analyzed. Fire-process is of heating joint glass cylinders during rotating using a dedicated glass lathe machine. The working behaviors of three operators were recorded by videos during “fire-process”. And the thickness of jointed part of final products was measured by ultrasonic equipment to evaluate the quality of the jointed situation. It is found that these differences in the process of heating joint of glass cylinder have effects on the accuracy of finial production and the manufacturing efficiency.
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Wang, Qiang, Zhen Wang, Pietro Patimisco, Angelo Sampaolo, Vincenzo Spagnolo, and Wei Ren. "Fiber Laser Intracavity Quartz-Enhanced Photoacoustic Gas Sensor." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleo_at.2018.ath1o.7.

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Reports on the topic "Fibre quartz"

1

Onoprienko, Dmitry V. Precise Measurement of the Left-Right Asymmetry in Z{sup 0} Production by e{sup +}e{sup -} collisions. Electron beam polarization measurement with the Quartz Fiber Calorimeter. Office of Scientific and Technical Information (OSTI), August 2000. http://dx.doi.org/10.2172/784832.

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Volunteer fire fighter / rescue diver dies in training incident at a quarry - Pennsylvania. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, July 2006. http://dx.doi.org/10.26616/nioshfffacef200529.

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