Journal articles: 'Holey fibres'

1

Monro, T. M., Y. D. West, D. W. Hewak, N. G. R. Broderick, and D. J. Richardson. "Chalcogenide holey fibres." Electronics Letters 36, no. 24 (2000): 1998. http://dx.doi.org/10.1049/el:20001394.

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Monro, T. M., D. J. Richardson, and P. J. Bennett. "Developing holey fibres for evanescent field devices." Electronics Letters 35, no. 14 (1999): 1188. http://dx.doi.org/10.1049/el:19990780.

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Faccio, D., A. Busacca, W. Belardi, V. Pruneri, P. G. Kazansky, T. M. Monro, D. J. Richardson, B. Grappe, M. Cooper, and C. N. Pannell. "Demonstration of thermal poling in holey fibres." Electronics Letters 37, no. 2 (2001): 107. http://dx.doi.org/10.1049/el:20010089.

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Monro, Tanya M., and David J. Richardson. "Holey optical fibres: Fundamental properties and device applications." Comptes Rendus Physique 4, no. 1 (January 2003): 175–86. http://dx.doi.org/10.1016/s1631-0705(03)00004-5.

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Wen-Wen, Ma, Li Shu-Guang, Yin Guo-Bing, Fu Bo, and Zhang Lei. "Study on pulse compression in tapered holey fibres." Chinese Physics B 19, no. 10 (October 2010): 104208. http://dx.doi.org/10.1088/1674-1056/19/10/104208.

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Kiang, K. M., K. Frampton, T. M. Monro, R. Moore, J. Tucknott, D. W. Hewak, D. J. Richardson, and H. N. Rutt. "Extruded singlemode non-silica glass holey optical fibres." Electronics Letters 38, no. 12 (2002): 546. http://dx.doi.org/10.1049/el:20020421.

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Bekker, E. V., T. M. Benson, P. Sewell, and L. A. Melnikov. "Modal Analysis of Holey Fibres with Convex and Non-Convex Polygon-Shaped Holes." Optical and Quantum Electronics 36, no. 8 (June 2004): 733–44. http://dx.doi.org/10.1023/b:oqel.0000039615.83853.52.

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Dritsas, I., T. Sun, and K. T. V. Grattan. "Stochastic optimization of conventional and holey double-clad fibres." Journal of Optics A: Pure and Applied Optics 9, no. 4 (March 26, 2007): 405–21. http://dx.doi.org/10.1088/1464-4258/9/4/016.

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Ghosh, R., A. Kumar, and J. P. Meunier. "Waveguiding properties of holey fibres and effective-V model." Electronics Letters 35, no. 21 (1999): 1873. http://dx.doi.org/10.1049/el:19991244.

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Arrospide, Eneko, Iñaki Bikandi, Igor Larrañaga, Xabier Cearsolo, Joseba Zubia, and Gaizka Durana. "Harnessing Deep-Hole Drilling to Fabricate Air-Structured Polymer Optical Fibres." Polymers 11, no. 11 (October 24, 2019): 1739. http://dx.doi.org/10.3390/polym11111739.

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The performance of a precisely controlled drilling technique is critical in the fabrication process of microstructured polymer optical fibres. For the creation of a holey preform, adequate drilling bits with large length-to-diameter ratios provide the ability of machining preforms with complex structures and large lengths in a relatively short time. In this work, we analysed different drilling bits and techniques that can be employed for the creation of such preforms, and key parameters characterising the quality of the drilled holes, such as surface rugosity, diameter deviation, coaxiality and cylindricity were measured. For this purpose, based on theoretical simulations, four rings of air holes arranged in a hexagonal pattern were drilled in the preforms with different drill bits, and the experimental results for the above mentioned parameters have been presented. Additionally, optical power distribution of the fabricated microstructured polymer optical fibres was theoretically calculated and experimentally measured.

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LOVE John, LOVE John. "Simple qualitative explanations for light guidance in index-guiding fibres, holey fibres, photonic band-gap fibres and nanowires." Chinese Journal of Optics and Applied Optics 7, no. 3 (2014): 499–508. http://dx.doi.org/10.3788/co.20140703.0499.

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Le Person, J., F. Smektala, T. Chartier, L. Brilland, T. Jouan, J. Troles, and D. Bosc. "Light guidance in new chalcogenide holey fibres from GeGaSbS glass." Materials Research Bulletin 41, no. 7 (July 2006): 1303–9. http://dx.doi.org/10.1016/j.materresbull.2006.01.007.

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Martynkien, T., G. Statkiewicz, M. Szpulak, J. Olszewski, G. Golojuch, W. Urbanczyk, J. Wojcik, et al. "Measurements of polarimetric sensitivity to temperature in birefringent holey fibres." Measurement Science and Technology 18, no. 10 (September 12, 2007): 3055–60. http://dx.doi.org/10.1088/0957-0233/18/10/s02.

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Hillman, C. W. J., W. S. Brocklesby, T. M. Monro, W. Belardi, and D. J. Richardson. "Structural and optical characterisation of holey fibres using scanning probe microscopy." Electronics Letters 37, no. 21 (2001): 1283. http://dx.doi.org/10.1049/el:20010874.

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Buchak, Peter, Darren G. Crowdy, Yvonne M. Stokes, and Heike Ebendorff-Heidepriem. "Elliptical pore regularisation of the inverse problem for microstructured optical fibre fabrication." Journal of Fluid Mechanics 778 (July 30, 2015): 5–38. http://dx.doi.org/10.1017/jfm.2015.337.

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A mathematical model is presented describing the deformation, under the combined effects of surface tension and draw tension, of an array of channels in the drawing of a broad class of slender viscous fibres. The process is relevant to the fabrication of microstructured optical fibres, also known as MOFs or holey fibres, where the pattern of channels in the fibre plays a crucial role in guiding light along it. Our model makes use of two asymptotic approximations, that the fibre is slender and that the cross-section of the fibre is a circular disc with well-separated elliptical channels that are not too close to the outer boundary. The latter assumption allows us to make use of a suitably generalised ‘elliptical pore model (EPM)’ introduced previously by one of the authors (Crowdy, J. Fluid Mech., vol. 501, 2004, pp. 251–277) to quantify the axial variation of the geometry during a steady-state draw. The accuracy of the elliptical pore model as an approximation is tested by comparison with full numerical simulations. Our model provides a fast and accurate reduction of the full free-boundary problem to a coupled system of nonlinear ordinary differential equations. More significantly, it also allows a regularisation of an important ill-posed inverse problem in MOF fabrication: how to find the initial preform geometry and the experimental parameters required to draw MOFs with desired cross-plane geometries.

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Fuochi, M., J. R. Hayes, K. Furusawa, W. Belardi, J. C. Baggett, T. M. Monro, and D. J. Richardson. "Polarization mode dispersion reduction in spun large mode area silica holey fibres." Optics Express 12, no. 9 (2004): 1972. http://dx.doi.org/10.1364/opex.12.001972.

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Ke, Jie, Yolanda Sánchez-Vicente, Geoffrey R. Akien, Alexander A. Novitskiy, Gurbuz Comak, Victor N. Bagratashvili, Michael W. George, and Martyn Poliakoff. "Detecting phase transitions in supercritical mixtures: an enabling tool for greener chemical reactions." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 466, no. 2122 (July 28, 2010): 2799–818. http://dx.doi.org/10.1098/rspa.2010.0267.

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Detecting phase transitions in high-pressure CO 2 and supercritical fluids was first attempted in the nineteenth century. By contrast, Green Chemistry, the design and implementation of cleaner methods of manufacturing and processing chemicals, is barely 20 years old. Now, the use of CO 2 as an environmentally more acceptable replacement for traditional solvents for greener chemical reactions is creating the need for new, more rapid methods for elucidating high-pressure phase behaviour. This paper describes the advantages and limitations of a number of approaches, developed in Nottingham, to meet this need, including acoustic measurements, shear-mode quartz sensors, the fibre-optic reflectometer, the use of holey fibres, attenuated total reflectance infrared spectroscopy and pressure drop measurements.

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Fedotov, Andrei B., Aleksei M. Zheltikov, A. P. Tarasevitch, Mikhail V. Alfimov, Anatoliy A. Ivanov, Leonid A. Golovan', Pavel K. Kashkarov, et al. "Controlled light localisation and nonlinear-optical interactions of short laser pulses in holey fibres." Quantum Electronics 31, no. 5 (May 31, 2001): 387–90. http://dx.doi.org/10.1070/qe2001v031n05abeh001960.

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19

Hlubina, P., D. Ciprian, and R. Chlebus. "Group index dispersion of holey fibres measured by a white-light spectral interferometric technique." Optics Communications 281, no. 15-16 (August 2008): 4008–13. http://dx.doi.org/10.1016/j.optcom.2008.04.015.

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Shu-Guang, Li, Hou Lan-Tian, Ji Yu-Ling, and Zhou Gui-Yao. "Supercontinuum Generation in Holey Microstructure Fibres with Random Cladding Distribution by Femtosecond Laser Pulses." Chinese Physics Letters 20, no. 8 (July 30, 2003): 1300–1302. http://dx.doi.org/10.1088/0256-307x/20/8/334.

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21

Kim, Jeong I. "Design and Electromagnetic Analysis of Microstructured Holey Optical Fibres with Stepwise Random-Air-Hole Distributions in Concentric Cladding Layers." International Journal of Engineering Research and Technology 13, no. 10 (October 31, 2020): 3067. http://dx.doi.org/10.37624/ijert/13.10.2020.3067-3071.

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22

Hlubina, P., M. Kadulová, and P. Mergo. "Chromatic dispersion measurement of holey fibres using a supercontinuum source and a dispersion balanced interferometer." Optics and Lasers in Engineering 51, no. 4 (April 2013): 421–25. http://dx.doi.org/10.1016/j.optlaseng.2012.11.011.

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23

Labonté, Laurent, Dominique Pagnoux, Philippe Roy, Faouzi Bahloul, and Mourad Zghal. "Numerical and experimental analysis of the birefringence of large air fraction slightly unsymmetrical holey fibres." Optics Communications 262, no. 2 (June 2006): 180–87. http://dx.doi.org/10.1016/j.optcom.2005.12.068.

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Kim, Jeong I. "Investigation of cladding effects on optical guidance of microstructured holey fibres based on FDM and FDTD methods." Journal of Modern Optics 56, no. 9 (May 20, 2009): 1091–95. http://dx.doi.org/10.1080/09500340902944053.

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25

Karny, Maciej. "The Influence of the Fastener Hole Preparation Method on the Fastener Pull-Through Process in a Carbon Composite." Transactions on Aerospace Research 2017, no. 1 (March 1, 2017): 45–53. http://dx.doi.org/10.2478/tar-2017-0005.

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Abstract This article studies the pull-through resistance of a titanium carbon fibre-epoxy resin laminate fastener. Coupons with fastener holes made with different methods were compared – drilled, milled on a CNC plotter and special fibre application during laminate production. The tests were conducted according to the ASTM D7332 test standard. The studies showed that the fastener hole preparation method impacts the laminate’s resistance to fastener pull-through. Coupons with holes made with standard (drilling and milling) methods showed fastener pull-through resistance higher, on average, by 6.5% than in coupons with holes placed during plate production. Fastener work to rupture was also higher for coupons with milled and drilled holes. Microscopic observations in UV-light, using a fluorescent penetrant, showed differences in failure mechanisms between individual coupons, especially the lack of fibres in the 0° direction, in immediate vicinity to a hole prepared during laminate application.

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Pereszlai, Csongor, and Norbert Geier. "Comparative analysis of wobble milling, helical milling and conventional drilling of CFRPs." International Journal of Advanced Manufacturing Technology 106, no. 9-10 (January 10, 2020): 3913–30. http://dx.doi.org/10.1007/s00170-019-04842-4.

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AbstractDue to its excellent specific mechanical properties, carbon fibre-reinforced polymer (CFRP) composite is a widely used structural material in the aerospace industry. However, this material is difficult to cut, mainly due to its inhomogeneity and anisotropic features and because of the strong wear effects of its carbon fibres. In the scope of aerospace industrial uses of this material, thousands of holes have to be machined for purposes of assembly. Nevertheless, conventional drilling technology – even if special drilling tools are used – is only moderately able to manufacture good quality holes. Wobble milling is a novel advanced hole-making technology, which has been developed to minimize machining-induced geometrical defects like delamination or uncut fibres. The main objective of the present paper is to compare wobble milling, helical milling and conventional drilling technologies concerning unidirectional CFRPs. In addition, the kinematics of wobble milling technology is discussed in detail. In the scope of this paper, numerous machining experiments were conducted in unidirectional CFRPs: herein the impact of the type of cutting tool and of process parameters on the quality of machined holes are analysed and discussed (diameter of holes, circularity error and characteristics of uncut fibres). During these investigations, experimental data were evaluated with the help of digital image processing (DIP) and with the help of analysis of variance (ANOVA) techniques. Experimental results show that the amount of uncut fibres can significantly be minimized through the application of wobble milling technology.

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Schwinn, Julian, Eric Breitbarth, Thomas Beumler, and Guillermo Requena. "Blunt Notch Strength of AA2024 3-3/2-0.4 Fibre Metal Laminate Under Biaxial Tensile Loading." Metals 9, no. 4 (April 5, 2019): 413. http://dx.doi.org/10.3390/met9040413.

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Fibre metal laminates are utilized in lightweight structures, such as aircraft fuselages, as fibre metal laminates provide outstanding fatigue and damage tolerance capabilities, together with a reduced weight compared to monolithic metallic structures. One critical feature of fuselage structures is their strength reduction that owes to riveting, i.e., a state-of-the-art joining technique in aircrafts. In the present work, the blunt notch strength of fibre-laminate panels with rivet holes is investigated under service-relevant biaxial loading conditions. To this purpose, cruciform specimens with a five-hole pattern were produced. These specimens were tested under various biaxiality ratios and fibre orientations. All tests were supported by three-dimensional digital image correlation to obtain the deformation field in the gauge area. Moreover, the displacement fields obtained during deformation were used in an elasto-plastic finite element model as boundary conditions to determine the maximum strains in the vicinity of the blunt notch holes and thus extend the application of the experimental results. The asymmetric strain fields obtained by digital image correlation reveal the interaction of the fibres with the blunt notch holes. Finally, it is shown that the biaxial loading conditions do not significantly influence the blunt notch strength.

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Koklu, Ugur, Sezer Morkavuk, Carol Featherston, Malik Haddad, David Sanders, Muhammad Aamir, Danil Yu Pimenov, and Khaled Giasin. "The effect of cryogenic machining of S2 glass fibre composite on the hole form and dimensional tolerances." International Journal of Advanced Manufacturing Technology 115, no. 1-2 (May 3, 2021): 125–40. http://dx.doi.org/10.1007/s00170-021-07150-y.

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AbstractS2 glass fibre reinforced epoxy composites are widely used in aeronautical applications owing to their excellent strength to weight ratio. Drilling glass fibres can be cumbersome due to their abrasive nature and poor thermal conductivity. Moreover, the use of conventional coolants is not desirable due to contamination and additional costs for cleaning the machine part. An alternative is to use environmentally friendly coolants such as liquid nitrogen (LN2) which have been previously employed in machining metals and composites. The current study investigates the effect of drilling S2 glass fibre composite in a bath of LN2. The study aims to evaluate the effect of spindle speed, feed rate and the presence of cryogenic cooling on the form and dimensional tolerances of the hole (hole size, circularity, cylindricity and perpendicularity). Design of experiments and analysis of variance (ANOVA) were used to determine the contribution of the input parameters on the analysed hole quality metrics. Results indicated that drilling S2 glass fibre in a cryogenic bath increased hole size significantly beyond the nominal hole diameter. The hole circularity and cylindricity were reduced compared to holes drilled under dry condition under all cutting parameters due to enhanced thermal stability during the drilling process. The current study aims to provide the scientific and industrial communities with the necessary knowledge on whether cryogenic bath cooling strategy provides better hole quality output compared to dry drilling and other cryogenic cooling strategies which were previously reported in the open literature.

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Soussan, L., M. Alquier, C. Guigui, S. Alfenore, S. Mathe, and C. Cabassud. "Characterization of the inline virus removal performances in hollow fibre modules by a new tracer electrochemically detected." Water Supply 13, no. 2 (March 1, 2013): 507–14. http://dx.doi.org/10.2166/ws.2013.054.

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In a previous work, an innovative and patented method was presented, that is based on a new virus surrogate. This surrogate is an enzyme-labelled MS2 phage that is directly detectable and quantifiable by amperometry thanks to its induced enzymatic activity. In this work, this method was used to characterize the dynamics of virus removal in micromodules as a function of the membrane defect size and the transmembrane pressure (TMP). Experiments were performed at lab scale with an integer module and with modules made with the same fibres with calibrated holes (50, 100, 150 μm) made in one of the module fibres with the laser method. Results showed first that the new method allowed diagnosing a 50 μm hole on the fibre of a micromodule. It was also demonstrated that, whatever the applied TMP, removal performances are all the more better that the defect size is smaller. Moreover, whatever the hole size, a TMP step rise from 1 to 1.5 bar during tracer filtration led to no significant change in the observed removal but improved the intrinsic removal performances.

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Pickrell, Gary R., Evgenya S. Smirnova, Stanton L. De Haven, and Robert S. Rogowski. "Hybrid Ordered Hole-Random Hole Optical Fibers." Advances in Science and Technology 45 (October 2006): 2598–607. http://dx.doi.org/10.4028/www.scientific.net/ast.45.2598.

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Photonic band gap (PBG) fibers have generated significant interest over the last decade due to the unique set of properties these fibers exhibit. In general, these fibers have been made by drawing a series of glass tubes (which are stacked in an ordered array) into a fiber. These fibers consist of an ordered arrangement of holes or tubes in a glass matrix. In this invited paper we describe a novel type of fiber, called HORHOFs (hybrid ordered random hole optical fibers). In these fibers, the refractive index of the ordered-hole region is controlled by incorporation of very small tubes of glass produced in-situ during the fiber drawing process. The result is a region of controllable glass density inside the “ordered hole”. This allows tailoring of the refractive index of the hole region and of the matrix glass around the holes. Description of the process to produce these new types of fibers, micrographs of some of the fibers produced, some potential applications, and the results of some computer modeling to predict the properties of these fibers, are presented.

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Vadodaria, Ketankumar, and George K. Stylios. "Ultrafine Web Formation from Bee’s Sweet Treasure." Advanced Materials Research 622-623 (December 2012): 1784–88. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.1784.

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Bees’ treasure “honey” is widely used in food, healthcare and cosmetic sectors. Manuka honey (MH) is a special honey derived by honey bees from the manuka tree. MH exhibits unique antibacterial activity called unique manuka factor (UMF). Honey is consumed mostly as liquid or dry powder. In the present study, MH was electrospun into fibre by blending it with polyethylene oxide (PEO). New ultrafine fibrous morphology of MH will widen its potential field of application and method of end use. The Manuka honey and PEO (MHPEO) blended electrospun fibre mats were observed under SEM to study fibre morphology. The effects of various solution parameters like MH/PEO ratio, viscosity, conductivity, surface tension etc. on MHPEO electrospun fibre morphology are also established. Effect of process parameters like feed rate, needle to collector distance (NTCD), applied voltage (app. volt.) etc. on 15% MHPEO (15MHPEO) fibre morphology are also determined. SEM observation revealed that smooth and unmerged fibres were obtained from PEO solution. More merged and thicker MHPEO fibres were obtained with increase in MH content as well as feed rate and decrease in app volt as well as NTCD. Electrospun mats were analysed using FTIR and DSC. FTIR curves showed characteristic peaks related to both PEO and MH in 15MHPEO mat. DSC curves showed shift of melting point towards lower temperature with increase in MH proportion. UV-vis spectra of PEO and MHPEO solutions were also studied.

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CHAKRAVARTHY, SRINATH S., and WILSON K. S. CHIU. "Boundary integral method for the evolution of slender viscous fibres containing holes in the cross-section." Journal of Fluid Mechanics 621 (February 12, 2009): 155–82. http://dx.doi.org/10.1017/s0022112008004783.

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We consider the evolution of slender viscous fibres with cross-section containing holes with application to fabrication of microstructured optical fibres. The fibre evolution is driven by either prescribing velocity or a force at the ends of the fibre, and the free surfaces evolve under the influence of surface tension, internal pressurization, inertia and gravity. We use the fact that ratio of the typical fibre radius to the typical fibre length is small to perform an asymptotic analysis of the full three-dimensional Navier–Stokes equations similar to earlier work on non-axisymmetric (but simply connected) fibres. A numerical solution to the multiply connected steady-state drawing problem is formulated based on the solution the Sherman–Lauricella equation. The effects of different drawing and material parameters like surface tension, gravity, inertia and internal pressurization on the drawing are examined, and extension of the method to non-isothermal evolution is presented.

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Zheltikov, Aleksei M. "Holey fibers." Physics-Uspekhi 43, no. 11 (November 30, 2000): 1125–36. http://dx.doi.org/10.1070/pu2000v043n11abeh000839.

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Zheltikov, Aleksei M. "Holey fibers." Uspekhi Fizicheskih Nauk 170, no. 11 (2000): 1203. http://dx.doi.org/10.3367/ufnr.0170.200011c.1203.

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Canning, John. "Properties of Specialist Fibres and Bragg Gratings for Optical Fiber Sensors." Journal of Sensors 2009 (2009): 1–17. http://dx.doi.org/10.1155/2009/871580.

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The advent of optical fibres based on air holes running along their entirety opens up new directions in addressing various properties relevant to sensing, including the temperature/strain challenge of optical fibre sensors. This paper looks at the measurement challenges associated with temperature and strain, examines the potentially unique functionality structured fibre designs with and without gratings open up, and briefly describes some current research directions within conventional fibre and grating technologies.

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Zhao, Chenwei, Zecan Tu, and Junkui Mao. "Investigation of the Film-Cooling Performance of 2.5D Braided Ceramic Matrix Composite Plates with Preformed Hole." Aerospace 8, no. 4 (April 19, 2021): 116. http://dx.doi.org/10.3390/aerospace8040116.

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The film-cooling performance of a 2.5D braided ceramic matrix composite (CMC) plate with preformed holes was numerically studied. Four numerical models containing braided structures were established: one model with film-cooling holes preformed through fiber extrusion deformation (EP-Hole), one model with film-cooling holes directly woven through fibers (WP-Hole), and two models with directly drilled holes (DP-Hole1,2). Besides, the influence of the ratio between the equivalent thermal conductivities on the axial and radial directions of fiber Kr was investigated. The results show that the preformed holes have better performance in controlling the thermal gradient with the increase of Kr. The maximum thermal gradient around the DP-Hole is significantly higher than that of the WP-Hole and EP-Hole, and the maximum relative variation reaches 123.3%. With Kr increasing from 3.32 to 13.05, the overall cooling effectiveness on the hot-side wall decreases for all models, by about 10%. Compared with the traditional drill method, the new preformed film-cooling hole studied in this paper can reduce the temperature and the thermal gradient in the region around the holes.

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Zhang, Zejun, Yasuhide Tsuji, and Masashi Eguchi. "Design of Polarization Splitter With Single-Polarized Elliptical-Hole Core Circular-Hole Holey Fibers." IEEE Photonics Technology Letters 26, no. 6 (March 2014): 541–43. http://dx.doi.org/10.1109/lpt.2013.2296592.

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Zejun Zhang, Yasuhide Tsuji, and Masashi Eguchi. "Study on Crosstalk-Free Polarization Splitter With Elliptical-Hole Core Circular-Hole Holey Fibers." Journal of Lightwave Technology 32, no. 23 (December 1, 2014): 4558–64. http://dx.doi.org/10.1109/jlt.2014.2361143.

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Cho, Jeong-Rae, Sung Yong Park, Keunhee Cho, Sung Tae Kim, and Byung-Suk Kim. "Pull-out test and discrete spring model of fibre-reinforced polymer perfobond rib shear connector." Canadian Journal of Civil Engineering 39, no. 12 (December 2012): 1311–20. http://dx.doi.org/10.1139/cjce-2011-0573.

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In this study, a series of pull-out tests on fibre-reinforced polymer (FRP) perfobond rib shear connectors were conducted to investigate their shear behavior. The test specimens were designed to examine only the effects of the resistance by rib holes. The test variables were the size and number of rib holes. In the tests, the resistance by concrete dowel action was practically linearly proportional to the area of the rib hole. However, the resistance appeared to be nonlinearly proportional to the number of rib holes with a slight loss for a larger number of the rib holes, due to the sequential failure of the rib holes. The constitutive equation of the discrete spring model representing the concrete dowel including post-failure frictional effects, adopting the diameter of the rib hole as parameter, was derived through regression analysis of the load – relative displacement curve obtained for specimens with a single rib hole. The proposed discrete spring model resulted in good correlation with the experimental results for specimens with a larger number of rib holes. It is expected that the derived constitutive equation would be useful for the analysis and design of structures using FRP perfobond rib shear connectors.

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Pal, Parama, and Wayne H. Knox. "End-sealing short dispersion micromanaged tapered holey fibers by hole-collapsing." Optics Express 15, no. 21 (2007): 13531. http://dx.doi.org/10.1364/oe.15.013531.

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Kumar, Dhiraj, and Kalyan Kumar Singh. "Effect of nanofiller on fibre laser drilling quality of carbon fibre reinforced polymer composite laminates." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 233, no. 4 (November 19, 2018): 857–70. http://dx.doi.org/10.1177/0954408918812253.

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Laser machining of carbon fibre reinforced polymer composites is a challenging task due to a significant difference between physical and thermal properties of the constituent materials, i.e. polymer matrix and carbon fibres. This results in extended heat-affected zone (HAZ), taper kerf and poor surface finishing. This paper focuses on an investigation, attempting to minimise the divergence in the decomposition temperature of carbon fibres and epoxy resin by adding multi-walled carbon nanotubes in polymer matrix as a secondary reinforcement. High thermal conductivity of multi-walled carbon nanotubes increases the thermal diffusivity of polymer matrix, which in turn reduces the matrix recession. In addition, laser power and scan speed was also considered as an input parameter and their influence on output responses such as HAZ, taper angle and surface roughness has been studied. To analyse the effect of multi-walled carbon nanotubes on the resultant thermal damage, an innovative technique, i.e. scanning acoustic microscopy was used. This technique provides a ply-by-ply damage analysis. C-scans of the top and bottom surface of the machined holes in the composite were also carried out. Further, micrographs of the holes were taken to analyse the quality of the holes using field-emission scanning electron microscope. The obtained results indicated that HAZ, taper angle and surface roughness of holes decreased by ∼30%, ∼47% and ∼43%, respectively, with 1.5 wt% multi-walled carbon nanotubes doped carbon fibre reinforced polymer laminates, when compared with the results obtained from experiments with neat carbon fibre reinforced polymer composite laminates.

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Eguchi, Masashi, and Yasuhide Tsuji. "Bending loss of elliptical-hole core circular-hole holey fibers bent in arbitrary bending directions." Applied Optics 49, no. 32 (November 2, 2010): 6207. http://dx.doi.org/10.1364/ao.49.006207.

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Kutin, A. A., and M. V. Turkin. "Advanced Fiber Laser Perforation Technology for Thermoplastic Pre-Preg Material." Key Engineering Materials 496 (December 2011): 36–43. http://dx.doi.org/10.4028/www.scientific.net/kem.496.36.

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A study concerning the application of fiber laser to perforate thermoplastic pre-pregs is presented. An IPG fiber laser was used to drill arrays of holes in PEKK carbon-fiber composite pre-preg material. Perforated holes were of the order of 100μm. The effects of laser perforation process parameters including the number of pulses on the geometry of the resultant holes and the thermal damage to the matrix and fibres have been investigated. Dimensional analysis and experimental results have been used to construct the laser perforation process model. Keywords: Laser perforation; Fibre laser; Process modelling; Polymer matrix composites.

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Mikucioniene, Daiva, Lina Cepukone, Khalifah A. Salmeia, and Sabyasachi Gaan. "Comparative Analysis of Peat Fibre Properties and Peat Fibre-Based Knits Flammability." Autex Research Journal 19, no. 2 (June 1, 2019): 157–64. http://dx.doi.org/10.1515/aut-2018-0033.

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Abstract A very promising cellulose-based natural fibre that is suitable for use in the textile industry is peat fibre. This fibre is a by-product of peat excavation, purified by separating it from other components. In this study, the morphological, chemical and mechanical properties of peat fibres as well as flammability of peat-based knitted fabrics were analysed. The average diameter of the peat fibres is ~60 μm, but it varies in very wide ranges – 25–150 μm; however, the number of fibres with diameter more than 100 μm is very low. As the peat fibre contains a high amount of lignin, lignin amount in the mixed peat/cotton yarn is relatively high too. Lignin is responsible for enhanced flame retardancy; therefore, time to ignition of the peat knit is ~30% higher than that of the cotton knit. Consequently, peat fibre can be used in the knitted structure in order to significantly reduce its flammability. In order to increase the flame retardancy, the knits have been treated by flame retardant in various concentrations. It was found that around the burned hole on the peat knit, treated by very low concentration flame retardant, forms charred area and the knit stops to burn even if the flame source is not removed.

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Elbadry, Elsayed A., GA Abdalla, M. Aboraia, and EA Oraby. "Notch sensitivity of short and 2D plain woven glass fibres reinforced with different polymer matrix composites." Journal of Reinforced Plastics and Composites 36, no. 15 (April 7, 2017): 1092–98. http://dx.doi.org/10.1177/0731684417702529.

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This research article investigated the notch sensitivity of two different glass fibre architectures, namely short and 2D plain-woven glass fibres reinforced with unsaturated polyester and epoxy matrix composites fabricated by the hand lay-up technique. This was carried out through open hole tension tests at different ratios of the specimen hole diameter to the specimen with three different values (0.1, 0.2, 0.5) compared to the unnotched specimen. The notch sensitivity of these composites was evaluated using the residual tensile strength by the application of Whitney–Nuismer Mathematical Model. The results showed that by using polyester matrix, the notch sensitivity of composites reinforced with plain-woven glass fibre is higher than that of short glass fibre at different D/W ratios. On the other hand, on testing epoxy matrixes, the notch sensitivity of composites reinforced with plain-woven glass fibre is lower than that of short glass fibre at different D/W ratios.

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Nakajima, Kazuhide, Kotaro Saito, Yusuke Yamada, Kenji Kurokawa, Tomoya Shimizu, Chisato Fukai, and Takashi Matsui. "Holey fibers for low bend loss." Nanophotonics 2, no. 5-6 (December 16, 2013): 341–53. http://dx.doi.org/10.1515/nanoph-2013-0030.

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AbstractBending-loss insensitive fiber (BIF) has proved an essential medium for constructing the current fiber to the home (FTTH) network. By contrast, the progress that has been made on holey fiber (HF) technologies provides us with novel possibilities including non-telecom applications. In this paper, we review recent progress on hole-assisted type BIF. A simple design consideration is overviewed. We then describe some of the properties of HAF including its mechanical reliability. Finally, we introduce some applications of HAF including to high power transmission. We show that HAF with a low bending loss has the potential for use in various future optical technologies as well as in the optical communication network.

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Ahmad Sobri, Sharizal, David Whitehead, Mazlan Mohamed, Julie Juliewatty Mohamed, Mohd Hazim Mohamad Amini, Andi Hermawan, Mohd Sukhairi Mat Rasat, Azfi Zaidi Mohammad Sofi, Wan Omar Ali Saifuddin Wan Ismail, and Mohd Natashah Norizan. "Augmentation of the Delamination Factor in Drilling of Carbon Fibre-Reinforced Polymer Composites (CFRP)." Polymers 12, no. 11 (October 23, 2020): 2461. http://dx.doi.org/10.3390/polym12112461.

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Carbon fibre-reinforced polymer (CFRP) composite materials play an increasingly important role in modern manufacturing, and they are among the more prominent materials used in aircraft manufacturing today. However, CFRP is highly prone to delamination and other damage when drilled due to it being extremely strong with a good strength-to-weight ratio and high thermal conductivity. Because of this problem and CFRP’s growing importance in aircraft manufacture, research has focused on the entry and exit holes as indicators of damage occurrence during drilling of screws, rivets, and other types of holes. The inside of the hole was neglected in past research and a proper way to quantify the internal side of a hole by combining the entry and exit hole should be included. To fill this gap and improve the use of CFRP, this paper reports a novel technique to measure the holes by using the extension of the adjusted delamination factor (SFDSR) for drilling thick CFRP composites in order to establish the influence of machining input variables on key output measures, i.e., delamination and other damages. The experimental results showed a significant difference in interpretation of the damage during the analysis. Improvement was made by providing better perspectives of identifying hole defects.

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Chen, Bin, Xiang He Peng, and Jing Hong Fan. "Round-Hole-Fiber Distribution in Hydrophilidae Cuticle and Biomimetic Research." Key Engineering Materials 288-289 (June 2005): 433–36. http://dx.doi.org/10.4028/www.scientific.net/kem.288-289.433.

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Insect cuticle possesses excellent mechanical properties, such as strength, stiffness and fracture toughness, which are closely related to its elaborate microstructures optimized through centuries’ evolution. SEM observation on Hydrophilidae cuticle shows a kind of biocomposite consisting of chitin-fiber plies and protein matrix, and the chitin-fiber plies are composed of several special arrangements. The observation also shows that there are many holes in the cuticle and the fibers passing along the brims of the holes round the holes continuously. Making use of such microstructure, a kind of biomimetic composite laminate with round-hole-fiber distribution is fabricated with preformed-hole method. The ultimate strength of the composite laminate is investigated and compared with that of the composite laminate with a hole drilled. It shows that the ultimate strength of the former is distinctly higher than that of the latter.

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Fidan, Hafize, Dasha Mihaylova, Nadezhda Petkova, Tana Sapoundzhieva, Anton Slavov, and Lutsian Krastev. "Determination of chemical composition, antibacterial and antioxidant properties of products obtained from carob and honey locust." Turkish Journal of Biochemistry 44, no. 3 (October 16, 2018): 316–22. http://dx.doi.org/10.1515/tjb-2018-0113.

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Abstract Objective The objective of this study was to characterize flours and syrups, obtained from pods of carob (Ceratonia siliqua L.) and honey locust (Gleditsia triacanthos). Method Flours and syrups, produced by carob and honey locust were analyzed for moisture, ash, protein content, dietary fibers, minerals composition, total phenolic content, as well as antibacterial and antioxidant activity. Results and discussion Carob flour contained high amounts of protein (22.56%) and dietary fibres (28.17%), respectively. Dietary fibers in honey locust flour (33.12%) were higher than that of carob flour (28.17%). The total phenolic content of carob flour (4.53±0.08) was lower than this of honey locust (25.31±0.06) (mg gallic acid equivalent [GAE]/g dry weight). Gleditsia triacanthos flour showed higher antioxidant potential – from 127.52±2.43 to 540.28±2.47 μM TE/g dw. Carob syrup in an amount of 0.15 cm3 demonstrated pronounced antibacterial activity against Listeria monocytogenes, Escherichia coli, Salmonella enterica and Staphylococcus aureus, respectively. Conclusion The current study demonstrated that flour and syrup, obtained from carob (C. siliqua L.) and honey locust (G. triacanthos) pods presented products rich of protein and dietary fiber (both above 20%), good sources of antioxidants, especially poliphenolic compounds and minerals (Mg, Fe and Zn).

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Manna, Alakesh, and Vivek Narang. "An Experimental Investigation during Micro Machining of E-Glass-Fibre-Epoxy Composite on Developed Electrochemical Spark Machining Setup." International Journal of Manufacturing, Materials, and Mechanical Engineering 2, no. 2 (April 2012): 46–60. http://dx.doi.org/10.4018/ijmmme.2012040103.

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In the present research, specially designed square cross-section with centrally micro hole brass tool and different diameter round shape micro tools made of IS-3748 steel were used for micro electrochemical spark machining (ECSM) of electrically non conductive e-glass-fibre-epoxy composite. To analyze the influences of the various process parameters of ECSM setup, the specific numbers of experiments have been carried out on developed ECSM setup. The ECSM performance characteristics such as material removal rate, hole depth, and over-cut on hole radius during machining of e-glass-fibre-epoxy composite under varying process parametric conditions are reported in this paper. From the test results, it is found that at higher setting value of D.C. supply voltage, moderate setting value of electrolytic concentration and 180 mm gap between tool (cathode) and auxiliary electrode (anode) the material removal rate is higher. Utilizing the test results mathematical models for MRR and over-cut on hole radius have been developed to express the effect of ECSM process parameters. Different SEM photographs of the micro holes show the surface texture of the machined holes and shape of the generated special shape contour.

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Journal articles on the topic 'Holey fibres'

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