Relevant bibliographies by topics / Fibers – Analysis

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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 'Fibers – Analysis'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Fibers – Analysis"

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Angel, Allen, and Kathryn A. Jakes. "Preparation And elemental analysis of ancient fibers." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 410–11. http://dx.doi.org/10.1017/s0424820100126846.

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Fabrics recovered from archaeological sites often are so badly degraded that fiber identification based on physical morphology is difficult. Although diagenetic changes may be viewed as destructive to factors necessary for the discernment of fiber information, changes occurring during any stage of a fiber's lifetime leave a record within the fiber's chemical and physical structure. These alterations may offer valuable clues to understanding the conditions of the fiber's growth, fiber preparation and fabric processing technology and conditions of burial or long term storage (1).Energy dispersive spectrometry has been reported to be suitable for determination of mordant treatment on historic fibers (2,3) and has been used to characterize metal wrapping of combination yarns (4,5). In this study, a technique is developed which provides fractured cross sections of fibers for x-ray analysis and elemental mapping. In addition, backscattered electron imaging (BSI) and energy dispersive x-ray microanalysis (EDS) are utilized to correlate elements to their distribution in fibers.
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Mcguigan, Michael R. M., William J. Kraemer, Michael R. Deschenes, Scott E. Gordon, Takashi Kitaura, Timothy P. Scheett, Matthew J. Sharman, and Robert S. Staron. "Statistical Analysis of Fiber Area in Human Skeletal Muscle." Canadian Journal of Applied Physiology 27, no. 4 (August 1, 2002): 415–22. http://dx.doi.org/10.1139/h02-022.

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Previous research has indicated that 50 fiber measurements per individual for type I and II fibers would be sufficient to characterize the fiber areas. This study replicated the work of McCall et al. (1998) using the three major fiber types (I, IIA, and IIB) and sampling larger populations of fibers. Random blocks of fibers were also examined to investigate how well they correlated with the overall mean average fiber area. Using random blocks of 50 fibers provided an accurate reflection of the type IIB fibers (r = 0.96-0.98) but not for the type I (r = 0.85-0.94) or IIA fibers (r = 0.80-0.91). Type I fibers were consistently reflected by a random block of 150 fibers (r = 0.95-0.98) while type IIA fibers required random blocks of 200 fibers (r = 0.94-0.98), which appeared to provide an accurate reflection of the cross-sectional area. These results indicate that for a needle biopsy different numbers of fibers are needed depending on the fiber type to accurately characterize the mean fiber population. Key words: fiber type, sample size, cross-sectional area, biopsy
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Zhou, Rong, and Ming Xia Yang. "Research on Mechanical Properties of Several New Regenerated Cellulose Fibers." Advanced Materials Research 332-334 (September 2011): 489–95. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.489.

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Regenerated cellulose fiber is the most widely-used and most variety of cellulose fiber. Five categories and ten kinds of fibers such as lyocell fiber, modal fiber, bamboo pulp fiber, sheng-bast fiber, Outlast viscose fiber were chosen as the research object. The strength property and elasticity of fibers in dry and wet state were tested and analysis. The comprehensive performances of fabrics were studied and mechanical properties of the fibers were listed in the order from good to bad by grey clustering analysis. The results show lyocell G100 and lyocell LF have better comprehensive mechanical properties ,while other new regenerated cellulose fibers’ comprehensive mechanical properties are general. Among these fibers modal fiber’s comprehensive mechanical properties are slightly better than sheng-bast fibers’ and bamboo pulp fibers’. Modal fiber, sheng-bast fiber and Bamboo pulp fiber have no significantly poor single parameter and all of them have better comprehensive mechanical properties than various viscose fibers. Outlast viscose in which has been added phase change materials sensitive to temperature by Microcapsule techniques fundamentally keeps similar comprehensive mechanical properties with other regenerated cellulose fibers,but its properties decline slightly .
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Cho, Liling, and David L. Wetzel. "Polarized microbeam FT-IR analysis of single fibers." Proceedings, annual meeting, Electron Microscopy Society of America 54 (August 11, 1996): 206–7. http://dx.doi.org/10.1017/s0424820100163496.

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Polarized infrared microscopy has been used for forensic purposes to differentiate among polymer fibers. Dichroism can be used to compare and discriminate between different polyester fibers, including those composed of polyethylene terephthalate that are frequently encountered during criminal casework. In the fiber manufacturering process, fibers are drawn to develop molecular orientation and crystallinity. Macromolecular chains are oriented with respect to the long axis of the fiber. It is desirable to determine the relationship between the molecular orientation and stretching properties. This is particularly useful on a single fiber basis. Polarized spectroscopic differences observed from a single fiber are proposed to reveal the extent of molecular orientation within that single fiber. In the work presented, we compared the dichroic ratio between unstretched and stretched polyester fibers, and the transition point between the two forms of the same fiber. These techniques were applied to different polyester fibers. A fiber stretching device was fabricated for use on the instrument (IRμs, Spectra-Tech) stage. Tension was applied with a micrometer screw until a “neck” was produced in the stretched fiber. Spectra were obtained from an area of 24×48 μm. A wire-grid polarizer was used between the source and the sample.
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Liu, Ling Yun, Chuan Qi Xu, Yu Qing Liu, and W. Pajeshwatt. "Preparetion and Quantitative Analysis of Programmable Polyester Fiber." Materials Science Forum 1001 (July 2020): 202–6. http://dx.doi.org/10.4028/www.scientific.net/msf.1001.202.

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At present, the anti-counterfeiting fibers are mainly monochromatic fluorescent fibers, dual-band fluorescent fibers, and multicolor segment dyed fibers. However, anti-counterfeiting fibers using only these several anti-counterfeiting methods are increasingly unable to meet the needs of anti-counterfeiting technology for high efficiency, greenness, and security. This paper studies the method of setting passwords using multi-bit sequence programming in the spinning process, and enables passwords to be effectively stored throughout the fiber production and sales chain. Because nanoscale metal inorganic salts and metal oxide powders have good dispersion, they can be well and uniformly dispersed in the spinning solution. In addition, metal elements can be relatively stable in the spinning process, providing the possibility of traceability of programmable passwords. Setting a password in this method can effectively improve the anti-counterfeiting performance of the fiber without affecting the basic properties of the fiber, and will help to develop new technology for tracking and identifying anti-counterfeit fibers.
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Cai, Yiyun, Abdelfattah Mohamed Seyam, and Yong K. Kim. "Formation of Fiberwebs from Staple Fibers with Controlled Fiber Orientation Using Electrostatic Forces: Theoretical Analysis." Journal of Engineered Fibers and Fabrics 2, no. 2 (June 2007): 155892500700200. http://dx.doi.org/10.1177/155892500700200202.

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Current web formation technologies used by the nonwovens industry do not provide positive control over fiber orientation and it is difficult to generate lightweight webs from staple fibers with these processes. The aim of this research is to develop new methods of fiberweb formation using electrostatic force, where orientation and orientation distribution of staple fibers are positively controlled. We carried out theoretical analysis and constructed computer models for this approach. Our analysis considered the effects of geometric configurations of fiber feeding and web formation zone, electrostatic and airflow field parameters, and the fiber's initial conditions at the feeding zone on fiber orientation. The theoretical analyses and computer modeling of the electrostatic web forming process provide better insights into this method and serve as a powerful tool for engineering development. Numerical results were obtained and presented for a range of processing variables.
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Bluemke, David A., Bridget Carragher, Barbara Gabriel, Michael J. Potel, and Robert Josephs. "Structural analysis of sickle hemoglobin fibers." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 742–43. http://dx.doi.org/10.1017/s042482010012802x.

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We have used helical reconstruction and electron density modeling techniques in our analysis of the structure of sickle hemoglobin (HbS) fibers. The formation of HbS fibers in red blood cells under conditions of deoxygenation is responsible for the clinical manifestations of sickle cell disease. Fibers have a helical pitch of about 2700 Å and an average diameter of about 210 Å. The subunit of structure in fibers consists of two half-staggered strands of HbS molecules termed double strands. Double strands in fibers are oriented such that the axis of the constituent double strands is nearly parallel to the particle axis, as indicated by the optical diffraction pattern of these particles.The pitch of fibers varies from particle to particle, as well as within a single fiber, and this presents special problems in the structural analysis. We have measured the distances corresponding to 180° of rotation in 245 fibers.
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Tungol, Mary W., Edward G. Bartick, and Akbar Montaser. "Forensic Analysis of Acrylic Copolymer Fibers by Infrared Microscopy." Applied Spectroscopy 47, no. 10 (October 1993): 1655–58. http://dx.doi.org/10.1366/0003702934334552.

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Ratios of absorbance peak areas ( AC=O/ AC=N) of carbonyl and nitrile groups were obtained for single acrylic fibers by IR microscopy. The precision of the comonomer ratios was evaluated for potential application in forensic fiber examinations. Precise (RSDs less than 0.4%) results for repetitive analyses of one location on a fiber were obtained. Precision was reduced when the cited ratio was measured at adjacent locations along the length of a single fiber. A further deterioration in precision was observed when different fiber specimens of the same type were analyzed. Analysis of different acrylic fiber specimens of the same type yielded RSDs which ranged from 2 to 6%. Fibers with diameters which ranged from 13 to 43 µm were examined. Precision was decreased for fibers with smaller diameters. Preliminary results indicate that acrylic fibers can differ by manufacturer as indicated by AC=O/ AC=N.
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Hanamori, T., K. Hirota, and N. Ishiko. "Receptive fields and gustatory responsiveness of frog glossopharyngeal nerve. A single fiber analysis." Journal of General Physiology 95, no. 6 (June 1, 1990): 1159–82. http://dx.doi.org/10.1085/jgp.95.6.1159.

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Receptive fields and responsiveness of single fibers of the glossopharyngeal (IXth) nerve were investigated using electrical, gustatory (NaCl, quinine HCl, acetic acid, water, sucrose, and CaCl2), thermal, and mechanical stimulation of the single fungiform papillae distributed on the dorsal tongue surface in frogs. 172 single fibers were isolated. 58% of these fibers (99/172) were responsive to at least one of the gustatory stimuli (taste fibers), and the remaining 42% (73/172) were responsive only to touch (touch fibers). The number of papillae innervated by a single fiber (receptive field) was between 1 and 17 for taste fibers and between 1 and 10 for touch fibers. The mean receptive field of taste fibers (X = 6.6, n = 99) was significantly larger than that of touch fibers (X = 3.6, n = 73) (two-tailed t test, P less than 0.001). In experiments with natural stimulation of single fungiform papillae, it was found that every branch of a single fiber has a similar responsiveness. Taste fibers were classified into 14 types (Type N, Q, A, NA, NCa, NCaA, NCaW, NCaAW, NCaWS, NQ, NQA, NQAS, NQWarm, Multiple) on the basis of their responses to gustatory and thermal stimuli. The time course of the response in taste fibers was found to be characteristic of their types. For example, the fibers belonging to Type NQA showed phasic responses, those in Type NCa showed tonic responses, etc. These results indicate that there are several groups of fibers in the frog IXth nerve and that every branch of an individual fiber has a similar responsiveness to the parent fiber.
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Zhang, Haiwei, Peiwen Hao, Yuan Pang, and Aaron D. Mwanza. "Design Method and Cost-Benefit Analysis of Hybrid Fiber Used in Asphalt Concrete." Advances in Materials Science and Engineering 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/8014704.

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Fiber, as an additive, can improve the performance of asphalt concrete and be widely studied, but only a few works have been done for hybrid fiber. This paper presents a new and convenient method to design hybrid fiber and verifies hybrid fiber’s superiority in asphalt pavement engineering. Firstly, this paper expounds the design method used as its applied example with the hybrid fiber composed of lignin, polyester, and polypropylene fibers. In this method, a direct shear device (DSD) is used to measure the shear damage energy density (SDED) of hybrid fiber modified asphalts, and range and variance statistical analysis are applied to determine the composition proportion of hybrid fiber. Then, the engineering property of hybrid fiber reinforced asphalt concrete (AC-13) is investigated. Finally, a cost-benefit model is developed to analyze the advantage of hybrid fiber compared to single fibers. The results show that the design method employed in this paper can offer a beneficial reference. A combination of 1.8% of lignin fiber and 2.4% of polyester fiber plus 3.0% polypropylene fiber presented the best reinforcement of the hybrid fiber. The cost-benefit model verifies that the hybrid fiber can bring about comprehensive pavement performance and good economy.
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Dissertations / Theses on the topic "Fibers – Analysis"

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Paye, Corey. "An Analysis of W-fibers and W-type Fiber Polarizers." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32474.

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Optical fibers provide the means for transmitting large amounts of data from one place to another and are used in high precision sensors. It is important to have a good understanding of the fundamental properties of these devices to continue to improve their applications. A specially type of optical fiber known as a W-fiber has some desirable properties and unique characteristics not found in matched-cladding fibers. A properly designed W- fiber supports a fundamental mode with a finite cutoff wavelength. At discrete wavelengths longer than cutoff, the fundamental mode experiences large amounts of loss. The mechanism for loss can be described in terms of interaction between the fiberâ ¢s supermodes and the lossy interface at the fiberâ ¢s surface. Experiments and computer simulations support this model of W-fibers. The property of a finite cutoff wavelength can be used to develop various fiber devices. Under consideration here is the fiber polarizer. The fiber polarizer produces an output that is linearly polarized along one of the fiberâ ¢s principal axes. Some of the polarizer properties can be understood from the study of W-fibers.
Master of Science
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Greaves, James David. "Numerical analysis of the outside vapor deposition process." Ohio : Ohio University, 1990. http://www.ohiolink.edu/etd/view.cgi?ohiou1183491109.

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Kim, Jeong I. "Analysis and Applications of Microstructure and Holey Optical Fibers." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/29089.

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Microstructure and photonic crystal fibers with periodic as well as random refractive-index distributions are investigated. Two cases corresponding to fibers with one-dimensional (1D) radial index distributions and two-dimensional (2D) transverse index distributions are considered. For 1D geometries with an arbitrary number of cladding layers, exact analytical solutions of guided modes are obtained using a matrix approach. In this part, for random index distributions, the average transmission properties are calculated and the influence of glass/air ratio on these properties is assessed. Important transmission properties of the fundamental mode, including normalized propagation constant, chromatic dispersion, field distributions, and effective area, are evaluated. For 2D geometries, the numerical techniques, FDTD (Finite-Difference Time-Domain) method and FDM (Finite Difference Method), are utilized. First, structures with periodic index distributions are examined. The investigation is then extended to microstructure optical fibers with random index distributions. Design of 2D microstructure fibers with random air-hole distributions is undertaken with the aim of achieving single-mode guiding property and small effective area. The former is a unique feature of the holey fiber with periodic air-hole arrangement and the latter is a suitable property for nonlinear fiber devices. Measurements of holey fibers with random air-hole distributions constitute an important experimental task of this research. Using a section of a holey fiber fabricated in the draw tower facility at Virginia Tech, measurements of transmission spectra and fiber attenuation are performed. Also, test results for far-field pattern measurements are presented. Another objective of this dissertation is to explore new applications for holey fibers with random or periodic hole distributions. In the course of measuring the holey fibers, it was noticed that robust temperature-insensitive pressure sensors can be made with these fibers. This offers an opportunity for new low-cost and reliable pressure fiber-optic sensors. Incorporating gratings into holey fibers in conjunction with the possibility of dynamic tuning offers desirable characteristics with potential applications in communications and sensing. Injecting gases or liquids in holey fibers with gratings changes their transmission characteristics. These changes may be exploited in designing tunable optical filters for communication applications or making gas/liquid sensor devices.
Ph. D.
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Ruys, David Julian Materials Science &amp Engineering Faculty of Science UNSW. "The influence of bast fibre structure on the mechanical properties of natural fibre composites." Awarded by:University of New South Wales. Materials Science & Engineering, 2007. http://handle.unsw.edu.au/1959.4/40688.

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Composite materials based on natural bast fibres offer potential commercial and environmental benefits due to the low cost, availiability, and biodegradability of the fibres. However, such benefits cannot be realised without a comprehensive evaluation of processing and properties. This thesis involved a comprehensive evaluation of composites based on two types of natural bast fibre (hemp and flax), and two types of matrix - synthetic (epoxy), and biodegradable (Novamont Mater-Si). The experimental work involved four strands: the effects of growing conditions and fibre processing on the properties of raw bast fibres; the optimisation of a pultrusion process for epoxy-matrix composites; development of a film stacking process for Mater-Bi composites, and a detailed evaluation of the mechanical properties of the composites themselves. Fibre bundles and individual fibre cells were investigated to characterise their structure, with particular focus on compressive kink defects. The kink bands were sectioned using a novel technique of focused ion beam milling, and kinking was found to induce delamination and voiding of the lamellar fibre structure. The defect concentration per unit length was assessed for conventionally-processed fibres and for hemp fibres from plants grown under controlled conditions to assess the effect of wind shear and stem flexure on fibre defect concentration. No effect was found for plant flexure, while industrially processed fibre was found to have increased defect concentration. The loading behaviour of both types of composite was seen to be initially linear with a yield point at 20 - 30 MPa and a transition to nonlinear deformation dominated by damage mechanisms as a result of fibre kinks. Epoxy composites possessed an inital modulus of 30 GPa with a 30 - 60% reduction in modulus after yield. Flax reinforcement was found to increase the modulus of Mater-Bi from 0.1 to 20 GPa and strength from 24 to 169 MPa. Fibre addition was also found to significantly embrittle the polymers.
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Shankaranarayanan, N. K. "Mode-mode interference in optical fibers: analysis and experiment." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45891.

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Interference between the modes of an optical fiber generates specific mode (intensity) patterns which get modulated by disturbances in the optical fiber system. Mode-mode interference has been analyzed from first principles and a model based on differential phase modulation presented. Mode-mode interference effects such as intensity modulation of the mode patterns are directly related to differential phase modulation between modes which arises due to the difference between the propagation constants of the constituent modes. Practical implementation of modal methods involves selective launching of modes and processing of the output pattern to demodulate the information.

Axial strain has been chosen as the modulating mechanism in experiments designed to quantify mode-mode interference effects. Quasi-statically varying strain as well as vibrational strain was used to study 'dc' and 'ac' mechanisms. Specific mode combinations have been excited and their radiation patterns identified. Mode pattern changes have been described. Experimental observations and results correlate very well with analysis.


Master of Science
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Apriyanto, Haris. "Study, analysis and experimental validation of fiber refractometers based on single-mode, multimode and photonic crystal fibers for refractive index measurements with application for the detection of methane." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0022.

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La mesure de l'indice de réfraction a été étudiée depuis qu'Ernest Abbé aie initialement conçu un réfractomètre en 1869, appelé le réfractomètre d'Abbé. Depuis lors, de nombreux réfractomètres ont été développés tels que le réfractomètre à prisme optique ainsi que le réfractomètre à fibre optique, en raison de leurs applications étendues pour la détection de divers paramètres physiques, biologiques et chimiques. Récemment, un grand nombre de chercheurs ont mis au point des réfractomètres basés sur des fibres optiques, exploitant des mécanismes tels que la résonance des plasmons de surface (SPR), les interférences multimodes, les fibres à réseaux de Bragg (FBG), les fibres à réseaux à longues périodes (LPG), les fibres optiques coniques et la fibre multimode à gaine dénudée. Les capteurs fibrés sont avantageux grâce à leur immunité contre les interférences électromagnétiques, passivité électrique au niveau de la sonde de détection et potentiel de mesure in situ à long terme. Cette thèse concerne le développement de modèles complets fonctionnels et précis pour les réfractomètres à fibres optiques basés sur la modulation d'intensité optique, en particulier la réfractométrie à fibre multimode à gaine dénudée ainsi que les systèmes hybrides associant fibres monomode et multimode, et un réfractomètre hybride tout fibré utilisant des fibres à cristaux photoniques. L'objectif clé de ce travail est de caractériser les performances de ces réfractomètres à fibres optiques basés sur la modulation d'intensité en termes de réponse en puissance, de sensibilité, de résolution et de dynamique de mesure. Les résultats de simulation qui sont corroborés expérimentalement démontrent que la très grande sensibilité obtenue dans la zone II (c'est-à-dire le régime de détection typiquement utilisé pour mesurer l'indice du milieu supérieur à l'indice de gaine mais inférieur ou égal à l'indice du coeur) pour tous les trois réfractomètres. Cependant, la sensibilité dans la Zone (c’est-à-dire le régime de détection pour lequel l’indice du milieu à mesurer est supérieur à celui du coeur) est très faible. Ainsi, un refractomètre fibré hybride monomode-multimode est utilisé pour améliorer la sensibilité dans la Zone III. D'autre part, la sensibilité pour la zone I (c'est-à-dire le régime de détection pour mesurer l’indice du milieu inférieur à l'indice de la gaine) a été améliorée en augmentant l'absorption des ondes évanescentes à l'aide du réfractomètre hybride tout fibré à base de fibres à cristaux photoniques à coeur solide. En termes d'application réelle du réfractomètre à fibre pour la détection biochimique, une preuve de concept pour un capteur du gaz méthane a été démontrée en utilisant les supramolécules de cryptophane-A qui permettent de piéger les molécules du méthane. Le cryptophane-A incorporé dans un film hôte à base de styrène acrylonitrile (SAN) est appliqué sur la zone dénudée du capteur comme une région fonctionnalisée. L'indice de réfraction de cette couche sensible augmente proportionnellement avec l'augmentation de la concentration du méthane, ce qui induit une variation de la puissance optique transmise dans le capteur fibré
Refractive index measurement has been studied since Ernest Abbé initially designed a refractometer in 1869, which is named the Abbé refractometer. Since then, numerous types of refractometers have been developed by employing either the optical prism-based refractometer or the optical fiber-based refractometer, due to their wide-ranging applications such as for sensingvarious physical, biological and chemical parameters. Recently, a large number of researchers have been developing refractometers based on optical fibers, exploiting mechanisms such as surface plasmon resonance (SPR), multimode interference, fiber Bragg gratings (FBG), long period gratings (LPG), tapered optical fibers, and striped-cladding multimode fibers (MMF), for their advantages in immunity against electromagnetic interference, electrical passivity at the sensing probe, and capability to long term in-situ measurement. This thesis concerns the development of comprehensively functional and accurate models for optical fiber refractometers based on optical intensity modulation, in particular for stripped-cladding MMF refractometry as well as hybrid systems involving a combination of single-mode-multimode fiber refractometery and the all-fiber hybrid refractometer using photonic crystal fibers. A key objective of this work is to characterize the performance of these intensity-based optical fiber refractometers in terms of their power response, sensitivity, resolution, and dynamic range. The simulation results which are corroborated experimentally demonstrate very high sensitivity being obtained in Zone II (i.e. the sensing regime typically employed for measuring a sensing medium index higher than the cladding index but less than or equal to the core index) for all three types of refractometers. However, the sensitivity in Zone III (i.e. the sensing regime for which the sensing medium index is higher than the core index) is very low. A hybrid single-mode fiber - multimode fiber configuration is used to improve the sensitivity in Zone III. On other hand, the sensitivity for Zone I (i.e. the sensing regime typically employed for measuring a sensing medium index lower than the cladding index) has been improved by increasing evanescent wave absorption using the all-fiber hybrid refractometer based on solid-core photonic crystal fibers. As a further potential of the fiber refractometer for applications in biochemical sensing, the proof-of-concept for a methane gas sensor has been demonstrated using supramolecular cryptophane-A which enables to trap the methane molecules. Cryptophane-A incorporated into a functionalized film of StyreneAcrylonitrile (SAN) host is applied to a de-cladded region of the sensor as the sensitive region. The refractive index of this functionalized layer increases proportionally with increasing methane concentration, subsequently inducing variations in the transmitted optical power along the fiber sensor
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Forsberg, Frans. "Gas Analysis using Hollow-Core Optical Fibers." Thesis, KTH, Tillämpad fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231924.

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Jain, Vibhor. "Analysis of structural development during superdrawing of poly(ethylene terephthalate) fibers." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28185.

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Thesis (M. S.)--Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Wang, Youjiang; Committee Co-Chair: Jacob, K.I.; Committee Member: Aneja, A.P.; Committee Member: Garmestani, Hamid; Committee Member: Thio, Yonathan S.; Committee Member: Yao, Donggang
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Kleinhans, Henrik. "Evaluation of the Carbonization of Thermo-Stabilized Lignin Fibers into Carbon Fibers." Thesis, Linköpings universitet, Kemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-120519.

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Thermo-stabilized lignin fibers from pH-fractionated softwood kraft lignin were carbonized to various temperatures during thermomechanical analysis (TMA) under static and increasing load and different rates of heating. The aim was to optimize the carbonization process to obtain suitable carbon fiber material with good mechanical strength potential (high tensile strength and high E-modulus). The carbon fibers were therefore mainly evaluated of mechanical strength in Dia-Stron uniaxial tensile testing. In addition, chemical composition, in terms of functional groups, and elemental (atomic) composition was studied in Fourier transform infrared spectroscopy (FTIR) and in energy-dispersive X-ray spectroscopy (EDS), respectively. The structure of carbon fibers was imaged in scanning electron microscope (SEM) and light microscopy. Thermogravimetrical analysis was performed on thermo-stabilized lignin fibers to evaluate the loss of mass and to calculate the stress-changes and diameter-changes that occur during carbonization. The TMA-analysis of the deformation showed, for thermo-stabilized lignin fibers, a characteristic behavior of contraction during carbonization. Carbonization temperatures above 1000°C seemed most efficient in terms of E-modulus and tensile strength whereas rate of heating did not matter considerably. The E-modulus for the fibers was improved significantly by slowly increasing the load during the carbonization. The tensile strength remained however unchanged. The FTIR-analysis indicated that many functional groups, mainly oxygen containing, dissociate from the lignin polymers during carbonization. The EDS supported this by showing that the oxygen content decreased. Accordingly, the relative carbon content increased passively to around 90% at 1000°C. Aromatic structures in the carbon fibers are thought to contribute to the mechanical strength and are likely formed during the carbonization. However, the FTIR result showed no evident signs that aromatic structures had been formed, possible due to some difficulties with the KBr-method. In the SEM and light microscopy imaging one could observe that porous formations on the surface of the fibers increased as the temperature increased in the carbonization. These formations may have affected the mechanical strength of the carbon fibers, mainly tensile strength. The carbonization process was optimized in the sense that any heating rate can be used. No restriction in production speed exists. The carbonization should be run to at least 1000°C to achieve maximum mechanical strength, both in E-modulus and tensile strength. To improve the E-modulus further, a slowly increasing load can be applied to the lignin fibers during carbonization. The earlier the force is applied, to counteract the lignin fiber contraction that occurs (namely around 300°C), the better. However, in terms of mechanical performance, the lignin carbon fibers are still far from practical use in the industry.
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Barake, Taha Mohamed. "A Generalized Analysis of Multiple-Clad Fibers with Arbitrary Step-Indx Profiles and Applications." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/9575.

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A generalized analysis of multiple-clad cylindrical dielectric structures with step-index profiles is presented. This analysis yields unified expressions for fields, dispersion equation and cutoff conditions for weakly guiding optical fibers with step-index but otherwise arbitrary profiles. The formulation focuses on triple-clad fibers, but can accommodate single and double-clad fibers as special limiting cases. Using the generalized solutions, transmission properties of several types of specialty fibers for broadband applications, including dispersion-shifted, dispersion-flattened, and dispersion compensating fibers, are studied. Improved designs for dispersion-shifted and dispersion compensating fibers are achieved. Fiber parameters and material compositions for the improved designs are provided. The proposed design for the dispersion-shifted fiber yields zero second-order as well as third-order dispersion at the 1.55 micrometer wavelength. The dispersion compensating fiber proposed here provides a large negative dispersion of about -400 ps/nm.km at the 1.55 micrometer wavelength for the fundamental mode. Numerical results for dispersion characteristics, cutoff wavelengths, and radial field distributions are provided.
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Books on the topic "Fibers – Analysis"

1

Hair and fibers. Armonk, N.Y: M.E. Sharpe, 2008.

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Barker, A. F. Analysis of woven fabrics. Chandigarh, India: Abhishek Publications, 2007.

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Forensic evidence: Hairs and fibers. New York: Crabtree Pub. Company, 2008.

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Curiger, Peter. Glassfibre reinforced concrete: Practical design and structural analysis. Düsseldorf: Beton-Verl., 1995.

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Hoelstad, Torsten. Fibre length by electronic image analysis. København: Danmarks geologiske undersøgelse, 1993.

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Cho, Liling. Single fiber analysis by FT-IR microspectroscopy. [Manhattan, Kan.]: [s.n.], 1997.

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Turner, Shirley. Airborne Asbestos Analysis. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1995.

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Yi, Kwi-bok. Kungnip Chungang Tosŏgwan sojang charyo yŏndaebyŏl sŏmyu punsŏkchip: Fiber analysis collections. Sŏul T'ŭkpyŏlsi: Kungnip Chungang Tosŏgwan, 2009.

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Kozlov, G. V. Synergetics and fractal analysis of polymer composites filled with short fibers. Hauppauge, NY: Nova Science Publishers, 2009.

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Kozlov, G. V. Synergetics and fractal analysis of polymer composites filled with short fibers. Hauppauge, NY: Nova Science Publishers, 2009.

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Book chapters on the topic "Fibers – Analysis"

1

Selvendran, R. R., A. V. F. V. Verne, and R. M. Faulks. "Methods for Analysis of Dietary Fibre." In Plant Fibers, 234–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83349-6_13.

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Reid, J. S. G. "Analysis of Carbohydrates Conferring Hardness on Seeds." In Plant Fibers, 295–312. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83349-6_16.

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Mort, A. J., P. Komalavilas, G. L. Rorrer, and D. T. A. Lamport. "Anhydrous Hydrogen Fluoride and Cell-Wall Analysis." In Plant Fibers, 37–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83349-6_3.

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Swords, K. M. M., and L. A. Staehelin. "Analysis of Extensin Structure in Plant Cell Walls." In Plant Fibers, 219–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83349-6_12.

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Sternberg, L. Da Silveira Lobo. "Oxygen and Hydrogen Isotope Measurements in Plant Cellulose Analysis." In Plant Fibers, 89–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83349-6_5.

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Azuma, Jun-Ichi. "Analysis of Lignin-Carbohydrate Complexes of Plant Cell Walls." In Plant Fibers, 100–126. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83349-6_6.

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Fry, S. C. "Analysis of Cross-Links in the Growing Cell Walls of Higher Plants." In Plant Fibers, 12–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83349-6_2.

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Budiansky, Bernard, and John C. Amazigo. "Notch Strength of Ceramic Composites: Long Fibers, Stochastics, Short Fibers." In IUTAM Symposium on Nonlinear Analysis of Fracture, 333–42. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5642-4_31.

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Bingener, Jürgen, and Hubert Flenner. "On the Fibers of Analytic Mappings." In Complex Analysis and Geometry, 45–101. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4757-9771-8_2.

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Tashiro, Kohji. "Progress in Structure Analysis Techniques of Fibers." In High-Performance and Specialty Fibers, 21–47. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55203-1_2.

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Conference papers on the topic "Fibers – Analysis"

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Guo, Zheying, and Raffaella De Vita. "Microstructural Constitutive Equation for Sprain Analysis." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67709.

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A new constitutive equation is presented to describe the damage evolution process in parallel fibered collagenous tissues such as ligaments and tendons. The model is formulated by accounting for the fibrous structure of the tissues. The tissue’s stress is defined as the average of the collagen fiber’s stresses. The fibers are assumed to be undulated and straighten out at different stretches that are defined by a Weibull probability density function. After becoming straight each fiber is assumed to be linear elastic. Its waviness is defined by a Weibull distribution. Tissue’s damage is assumed to occur at the fiber level and is defined as a reduction in the fiber’s stiffness. The proposed model is validated by using experimental data published in the biomechanics literature by Provenzano et al. [1].
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Kozaitis, Samuel P., Harold G. Andrews II, and Wesley E. Foor. "Optical image analysis using fractal techniques." In Fibers '92, edited by Andrew R. Pirich and Paul Sierak. SPIE, 1993. http://dx.doi.org/10.1117/12.141707.

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Sun, Xiaohan. "Unified analysis of ellipsoid-shaped optical fibers." In Fibers '92, edited by Paul M. Kopera. SPIE, 1993. http://dx.doi.org/10.1117/12.141197.

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Mlynarczuk, Mariusz. "Directional fibers analysis." In Lasers, Optics, and Vision for Productivity in Manufacturing I, edited by Panayotis A. Kammenos and Bertram Nickolay. SPIE, 1996. http://dx.doi.org/10.1117/12.248575.

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Ripa, Cameron, Andrew Latulippe, Hongwei Sun, Stephen Fossey, and Christopher Drew. "Curvature Change Analysis of SMART Fibers Used for Temperature Adaptive Insulation." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11620.

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Abstract A new method of characterizing the curvature change in thermally adaptive fibers is introduced in this paper. Based on the same principle as bi-metallic strips commonly found in thermostats, multi-component polymer fibers can be created to change their geometrical form in response to a temperature change. This works by creating fibers from two or more materials that have a mismatched Coefficient of Thermal Expansion (CTE). A temperature change leads to a change in curvature of these fibers. When fibers interact in an insulation batting structure, a temperature change leads to a thickness change in the insulation. While these fibers have visually been observed to function, there was no method to quantitatively characterize their curvature performance. This paper introduces a method that can be used to quantify fiber performance by tracking change in curvature over a specific temperature range. This is accomplished by suspending fibers on the surface of a liquid bath and changing the bath temperature. Digital images of the fiber are taken at different temperatures and analyzed using software to determine the radius of curvature. Absolute change in curvature was found to be as high as 0.5% per degree °C from 20 to −20°C for certain samples. A trend was also noted between higher initial curvature and lower overall performance. Digital image correlation was further used to investigate the time-dependence relationship of fiber curvature. Future experiments can be performed with this setup to characterize and compare curvature change performance of different fibers accurately.
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Hussain, Mozammil. "Incomplete Fibers Affect Disc Biomechanics Higher Than the Fibers With Laxity: A Finite Element Model Analysis." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53914.

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Disc morphological disruptions — incomplete length and laxity in annular fibers — affect the behavior of the disc tissues in different ways. These changes in fibers alter the main function of the disc — inter-segmental load transfer along the spine — by affecting the surrounding extracellular disc tissue matrix. Tissues surrounding the altered fibers experience variations in stress distributions and the biomechanical reasoning behind variations in stress patterns may be multifactorial. While incomplete fibers are found in both healthy and aged discs with higher occurrences in the later ones [1], laxity in fibers is a progressive degenerative property [2]. How much the fiber incompleteness relative to the laxity in fibers contributes to the disc biomechanics remains to be clearly quantified?
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Buford, John F., J. Lloyd Rutledge, Richard A. Miner, and Patrick D. Krolak. "Supporting real-time analysis of multimedia communication sessions." In Fibers '92, edited by Jacek Maitan. SPIE, 1993. http://dx.doi.org/10.1117/12.139258.

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Paradisi, Alberto, Michele Goano, and Ivo Montrosset. "Multisection traveling-wave semiconductor laser amplifiers: analysis and optimization." In Fibers '92, edited by Leonid G. Kazovsky and Karen Liu. SPIE, 1992. http://dx.doi.org/10.1117/12.139306.

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He, Gang, and Marek T. Wlodarczyk. "High-temperature performance analysis of automotive combustion pressure sensor." In Fibers '92, edited by Luis Figueroa, Mototaka Kitazawa, Norris E. Lewis, Robert E. Steele, and Deepak Varshneya. SPIE, 1993. http://dx.doi.org/10.1117/12.141355.

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Bonello, Roberto, and Ivo Montrosset. "Static and dynamic analysis of multisection and multielectrode semiconductor lasers." In Fibers '92, edited by Leonid G. Kazovsky and Karen Liu. SPIE, 1992. http://dx.doi.org/10.1117/12.139305.

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Reports on the topic "Fibers – Analysis"

1

Klingsporn, P. E. Fabrication, measurement, and alignment uniformity analysis of linear arrays of optical fibers. Office of Scientific and Technical Information (OSTI), June 1997. http://dx.doi.org/10.2172/527565.

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Lewis, Randolph. X-ray Diffraction and Neutron Scattering Analysis of Natural and Synthetic Spider Silk Fibers. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1104739.

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Klingsporn, P. E. Hexagonal close-packed arrays of optical fibers for partitioning a laser beam into individual beamlets: Analysis and prototype fabrication. Office of Scientific and Technical Information (OSTI), July 1997. http://dx.doi.org/10.2172/650163.

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Jones, R. W., and J. F. McClelland. On-line Sensor System fro Monitoring the Cure of Coatings on Glass Optical Fibers. Phase II: Application of the Sensor System to On-line Molecular Analysis Needs in Other Industries of the Future. Office of Scientific and Technical Information (OSTI), September 2005. http://dx.doi.org/10.2172/882997.

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Briggs, Timothy, Shawn Allen English, and Stacy Michelle Nelson. Quasi-Static Indentation Analysis of Carbon-Fiber Laminates. Office of Scientific and Technical Information (OSTI), December 2015. http://dx.doi.org/10.2172/1234188.

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Das, Sujit, Joshua A. Warren, Devin West, and Susan M. Schexnayder. Global Carbon Fiber Composites. Supply Chain Competitiveness Analysis. Office of Scientific and Technical Information (OSTI), May 2016. http://dx.doi.org/10.2172/1254094.

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Das, Sujit, Josh Warren, Devin West, and Susan M. Schexnayder. Global Carbon Fiber Composites Supply Chain Competitiveness Analysis. Office of Scientific and Technical Information (OSTI), May 2016. http://dx.doi.org/10.2172/1260138.

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Das, Sujit, Josh Warren, Devin West, and Susan M. Schexnayder. Global Carbon Fiber Composites Supply Chain Competitiveness Analysis. Office of Scientific and Technical Information (OSTI), May 2016. http://dx.doi.org/10.2172/1333049.

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Iyer, Ananth V., Samuel Labi, Steven Dunlop, Thomas Brady Jr., and Eki Amijaya. Cost and Benefit Analysis of Installing Fiber Optics on INDOT Projects. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317131.

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The Indiana Department of Transportation (INDOT) is tasked with the stewardship of billions of dollars’ worth of public invested highway infrastructure. Not only does INDOT continually seek design and operational policies that foster cost effective project delivery and procurement, they also seek opportunities for revenue generation. Due to population growth and the increased demand for online connectivity and global information transmission, the fiber-optic cable industry has experienced rapid growth over the past few years. Information and communication technology (ICT) companies have long sought to achieve higher economic productivity by installing fiber-optic cables in the right of way (ROW) of access-controlled highways. Based on these developments, an experiment was conducted to measure the economic impact in Indiana. To determine this impact, a database was developed by compartmentalizing the analysis into (1) GDP per county per industry type, (2) the natural growth of GDP as a factor, and (3) the extent of contribution of broadband in the growth of GDP. A general formula was developed to incorporate the adjusted median income on both the industry and county levels, along with a broadband contribution factor. This formula was employed to determine policies that can produce optimum economic outcome by leveraging the Pareto method.
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Das, Sujit. Clean Energy Manufacturing Analysis Center. 2015 Research Highlights -- Carbon Fiber. Office of Scientific and Technical Information (OSTI), March 2016. http://dx.doi.org/10.2172/1254092.

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