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NSYSU
1.
Wu, Kun-Shain.
Fabrication and Application of Capillary Optical Fiber and Microstructure Fiber.
Degree: Master, Electro-Optical Engineering, 2011, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0825111-145305 
► v Abstract This study was developed using fiber drawing tower to fabricate various types of capillary fiber and microstructured fiber. For example, different diameter sizes,…
(more)
▼ v
Abstract
This study was developed using
fiber drawing tower to fabricate
various types of capillary
fiber and microstructured
fiber. For example,
different diameter sizes, different thickness, different internal diameter
ratio of the capillary
fiber and capillary tube, single ring and double
ring hexagonal arrangement of the air-holes microstructured
fiber.
Trying different ways to create complex structures preform, we
use the stack - drawing - cutting way, is now able to produce only
simple pressure can be achieved by the complex structure of the
preform, compared to drilling way, we can effectively reduce the
production costs of 80%. Now successfully produced a single ring and
double ring hexagonal air holes arranged in preform which has been
drawn into standard
fiber. Depending on the optical properties, we can
use quartz tube with a row of self-developed method to produce most
of the complex structure of the preform. However, each
fiber is still
not very uniform about the pores, which we need to improve in the
manufacturing process of
fiber drawing. Produce more diverse system
and much homogeneous microstructured
fiber as the goal. Application is to use the self-fabricated capillary tube, after
processing, the production target into a low-loss device, then inject
different materials within the devices, and do the different optical
measurements for our devices.
Advisors/Committee Members: Wood-Hi Cheng (chair), Jau- Sheng Wang (committee member), Chin-Ping Yu (chair).
Subjects/Keywords: preform; fiber; microstructured fiber; capillary optical fiber
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APA (6th Edition):
Wu, K. (2011). Fabrication and Application of Capillary Optical Fiber and Microstructure Fiber. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0825111-145305
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wu, Kun-Shain. “Fabrication and Application of Capillary Optical Fiber and Microstructure Fiber.” 2011. Thesis, NSYSU. Accessed April 16, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0825111-145305.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wu, Kun-Shain. “Fabrication and Application of Capillary Optical Fiber and Microstructure Fiber.” 2011. Web. 16 Apr 2021.
Vancouver:
Wu K. Fabrication and Application of Capillary Optical Fiber and Microstructure Fiber. [Internet] [Thesis]. NSYSU; 2011. [cited 2021 Apr 16].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0825111-145305.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wu K. Fabrication and Application of Capillary Optical Fiber and Microstructure Fiber. [Thesis]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0825111-145305
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Shaik, Khadar Vali.
Impact testing of advanced ceramic composites using
experimental and F E analysis.
Degree: 2010, Jawaharlal Nehru Technological University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/2680
► The increasing use of advanced Ceramic Composites in Aircrafts, Automobiles, Missile Systems and Space Structures has been well documented and continuously receiving the wide attention…
(more)
▼ The increasing use of advanced Ceramic Composites
in Aircrafts, Automobiles, Missile Systems and Space Structures has
been well documented and continuously receiving the wide attention
of industry. The structural engineer needs to be familiar with the
property of the composite material structures. The behavior of
ceramic composite material under impact load plays a pivotal role
in designing such structures. An impact test is a test for
determining the energy absorbed in fracturing a test piece at high
velocity. The impact resistance of a part is, in many applications,
a critical measure of service life. In the current work, an attempt
is made to present the dynamic behavior of the advanced ceramic
composite material, i.e., 3 Dimensional Carbon-Silicon Carbide (3D
C-SiC) under the impact, tensile and flexure loads and the
mechanical properties, viz., Impact Strength, Tensile Strength and
Flexural Strength are determined. In 3Dimensional Geometric
Modeling, the spatial orientation of the yarn is explained and the
geometric parameters are estimated. 3D C-SiC composite specimens
with a fiber volume fraction of 40% are prepared by Liquid Silicon
Infiltration (LSI) process to 3 conduct the required experiments
for evaluating the mechanical properties. The experimental results
of impact, tensile, flexure and shear strengths recorded during the
tests are 26.82 kJ/m2, 70.2 MPa, 230.3 MPa and 30.5 MPa
respectively. Computer simulations by using ANSYS 11.0 software
gave very consistent results with a variation of approximately 1-4
% which can be considered as an acceptable range.
Abstract includes, Reference
p.110-122
Subjects/Keywords: Woven fiber; 3D Carbon fiber
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APA (6th Edition):
Shaik, K. V. (2010). Impact testing of advanced ceramic composites using
experimental and F E analysis. (Thesis). Jawaharlal Nehru Technological University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/2680
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shaik, Khadar Vali. “Impact testing of advanced ceramic composites using
experimental and F E analysis.” 2010. Thesis, Jawaharlal Nehru Technological University. Accessed April 16, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/2680.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shaik, Khadar Vali. “Impact testing of advanced ceramic composites using
experimental and F E analysis.” 2010. Web. 16 Apr 2021.
Vancouver:
Shaik KV. Impact testing of advanced ceramic composites using
experimental and F E analysis. [Internet] [Thesis]. Jawaharlal Nehru Technological University; 2010. [cited 2021 Apr 16].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/2680.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shaik KV. Impact testing of advanced ceramic composites using
experimental and F E analysis. [Thesis]. Jawaharlal Nehru Technological University; 2010. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/2680
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Clemson University
3.
Hawkins, Thomas Wade.
The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers.
Degree: PhD, School of Materials Science and Engineering, 2020, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/2585
► This research studies and yields new understandings into the materials science and engineering of advanced multicomponent glass systems, which is critical for next generation…
(more)
▼ This research studies and yields new understandings into the materials science and engineering of advanced multicomponent glass systems, which is critical for next generation
fiber lasers operating at high output powers. This begins with the study and development of Yb-doped glasses in the Al2O3-P2O5-SiO2 (APS) ternary system, fabricated using modified chemical vapor deposition (MCVD), that, despite being highly doped, possess an average refractive index matched to that of silica (SiO2). The highly doped active core material was subsequently processed through a multiple stack-and-draw process to realize a single
fiber with high doping, compositionally-tailored index, and scalability for
fiber lasers. Based on the knowledge gained in this first focal area, further strategic compositional tailoring to influence the glass’ photoelastic and thermo-optic coefficient, was performed in order to understand and realize significant decreases in Brillouin and thermal-Rayleigh scattering, which instigate parasitic stimulated Brillouin scattering (SBS) and transverse mode instabilities (TMI) in high power
fiber lasers. In addition to understanding the composition / structure / properties of these glasses, a double-clad
fiber laser will be fabricated, scaled to over 1 kW of output laser power, and studied in order to relate the materials science and engineering of multiple glass systems and fibers designs to laser performance and properties.
Advisors/Committee Members: Liang Dong, John Ballato, Peter Dragic, Stephen Foulger, Phil Brown.
Subjects/Keywords: fiber laser; MCVD; optical fiber
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APA (6th Edition):
Hawkins, T. W. (2020). The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2585
Chicago Manual of Style (16th Edition):
Hawkins, Thomas Wade. “The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers.” 2020. Doctoral Dissertation, Clemson University. Accessed April 16, 2021.
https://tigerprints.clemson.edu/all_dissertations/2585.
MLA Handbook (7th Edition):
Hawkins, Thomas Wade. “The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers.” 2020. Web. 16 Apr 2021.
Vancouver:
Hawkins TW. The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers. [Internet] [Doctoral dissertation]. Clemson University; 2020. [cited 2021 Apr 16].
Available from: https://tigerprints.clemson.edu/all_dissertations/2585.
Council of Science Editors:
Hawkins TW. The Materials Science and Engineering of Advanced YB-Doped Glasses and Fibers for High-Power Lasers. [Doctoral Dissertation]. Clemson University; 2020. Available from: https://tigerprints.clemson.edu/all_dissertations/2585
NSYSU
4.
Hu, Jie-fang.
Fabry-Pérot Fiber Interferometers Based on Polymer Microlenses structure on A Fiber Tip.
Degree: Master, Electro-Optical Engineering, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705114-161825
► In this dissertation we proposed a Fabry-Pérot fiber interferometer based on a polymer microlens structure on the endface of a single-mode fiber. We can simply…
(more)
▼ In this dissertation we proposed a Fabry-Pérot
fiber interferometer based on a polymer microlens structure on the endface of a single-mode
fiber. We can simply attach a fixed mass of polymer at the
fiber end to form a microlens structure due to the surface tension effect. As the light wave propagates to the interfaces of SMF/polymer and polymer/air, we can obtain two reflective light beams with different optical paths to form the reflective interference spectrum. Besides, as the curvature of radius of the microlens structure increases, the average spacing of the interference fringe becomes larger in the same wavelength range.
We have demonstrated the sensing applications of the microlens-based Fabry-Pérot
fiber interferometers for temperature, surrounding refractive index, and pressure. The temperature sensitivity between 25â to 65â is 634pm/â for the 126.14μm microlens-based
fiber interferometer. As we increase the surrounding refractive index from 1.33 to 1.4071, the 78.82μm microlens-based
fiber interferometer shows a 6.38dB peak intensity difference, and the refractive index sensitivity is -82.26dB/RIU. In addition, the measured pressure sensitivity for the 75μm microlens-based
fiber interferometer is 89pm/psi. We have also compressed the microlens structure by a movable object and found that the average spacing of the interference fringe becomes larger. As a result, our fabricated microlens-based Fabry-Pérot
fiber interferometers can be utilized as useful sensors.
Advisors/Committee Members: Jui-Yang Feng (chair), Hung-wen Chang (chair), Chin-Ping Yu (committee member), Hidenori Taga (chair).
Subjects/Keywords: Fiber Interferometers
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APA (6th Edition):
Hu, J. (2014). Fabry-Pérot Fiber Interferometers Based on Polymer Microlenses structure on A Fiber Tip. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705114-161825
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hu, Jie-fang. “Fabry-Pérot Fiber Interferometers Based on Polymer Microlenses structure on A Fiber Tip.” 2014. Thesis, NSYSU. Accessed April 16, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705114-161825.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hu, Jie-fang. “Fabry-Pérot Fiber Interferometers Based on Polymer Microlenses structure on A Fiber Tip.” 2014. Web. 16 Apr 2021.
Vancouver:
Hu J. Fabry-Pérot Fiber Interferometers Based on Polymer Microlenses structure on A Fiber Tip. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Apr 16].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705114-161825.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hu J. Fabry-Pérot Fiber Interferometers Based on Polymer Microlenses structure on A Fiber Tip. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705114-161825
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
5.
Booysen, André.
Veseloptiese koppelaars : vervaardiging en sensortoepassings.
Degree: 2014, University of Johannesburg
URL: http://hdl.handle.net/10210/10079
► M.Ing.
This thesis covers the theory and development of fused, biconically tapered, fibre-optic couplers and their application in sensors. The optical coupling between fibres is…
(more)
▼ M.Ing.
This thesis covers the theory and development of fused, biconically tapered, fibre-optic couplers and their application in sensors. The optical coupling between fibres is described by means of the coupled-mode theory in the case of a weakly guiding coupler. Firstly, simplified expressions for the guided modes in an optical fibre are derived. This is followed by the derivation of the coupled-mode equations for a perturbed waveguide. The coupled-mode equations are then used, together with the expressions for the guided modes, to determine the coupling coefficient for a weakly guiding coupler. In the case where the coupler is not weakly guiding, a model based on a rectangular dielectric waveguide is presented. A process for the manufacture of fibre-optic couplers, based on the fusion and elongation technique, was developed. This process is described and special attention is paid to the influence which different process parameters has on the properties of the couplers. During the development, the coupling theory was utilized to optimize the process. Results obtained with couplers manufactured by this process, are presented. A specific application of couplers, namely a new type of fibre-optic coupler sensor, was developed. The operation of the sensor relies on the change of the coupling ratio with an axially applied mechanical strain. Analog signal processing of the two outputs yields a signal which is directly proportional to the strain and which is independent of fluctuations of the light source power. The sensor was investigated experimentally by manufacturing temperature and elongation sensors which work on this principle. The operation and features of these sensors are presented, together with very promising experimental results.
Subjects/Keywords: Fiber optics
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APA (6th Edition):
Booysen, A. (2014). Veseloptiese koppelaars : vervaardiging en sensortoepassings. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/10079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Booysen, André. “Veseloptiese koppelaars : vervaardiging en sensortoepassings.” 2014. Thesis, University of Johannesburg. Accessed April 16, 2021.
http://hdl.handle.net/10210/10079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Booysen, André. “Veseloptiese koppelaars : vervaardiging en sensortoepassings.” 2014. Web. 16 Apr 2021.
Vancouver:
Booysen A. Veseloptiese koppelaars : vervaardiging en sensortoepassings. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10210/10079.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Booysen A. Veseloptiese koppelaars : vervaardiging en sensortoepassings. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/10079
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Wake Forest University
6.
LI, WEI.
Single Fibrin Fiber Mechanical Properties and Lysis.
Degree: 2015, Wake Forest University
URL: http://hdl.handle.net/10339/57266
► Fibrinogen, one of the most abundant proteins in blood plasma, plays a central role in hemostasis and thrombotic disease. In the final step of the…
(more)
▼ Fibrinogen, one of the most abundant proteins in blood plasma, plays a central role in hemostasis and thrombotic disease. In the final step of the coagulation cascade, thrombin proteolytically converts fibrinogen to fibrin, which then forms a mesh of fibrin fibers. This mesh is the major structural component of a blood clot. Over the last few years the mechanical properties of fibrin fibers, such as their modulus, elasticity and extensibility, have been determined using samples formed from purified fibrinogen. In my work, presented in this dissertation, I initiated study on the more complex and more physiologically relevant fibrin fibers formed from plasma samples, in an effort to find relationships between single fibrin fiber mechanical properties and disease states.
Subjects/Keywords: fibrin fiber
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APA (6th Edition):
LI, W. (2015). Single Fibrin Fiber Mechanical Properties and Lysis. (Thesis). Wake Forest University. Retrieved from http://hdl.handle.net/10339/57266
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
LI, WEI. “Single Fibrin Fiber Mechanical Properties and Lysis.” 2015. Thesis, Wake Forest University. Accessed April 16, 2021.
http://hdl.handle.net/10339/57266.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
LI, WEI. “Single Fibrin Fiber Mechanical Properties and Lysis.” 2015. Web. 16 Apr 2021.
Vancouver:
LI W. Single Fibrin Fiber Mechanical Properties and Lysis. [Internet] [Thesis]. Wake Forest University; 2015. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10339/57266.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
LI W. Single Fibrin Fiber Mechanical Properties and Lysis. [Thesis]. Wake Forest University; 2015. Available from: http://hdl.handle.net/10339/57266
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Nelson Mandela Metropolitan University
7.
Dlamini, Phumla Patience.
Data transport over optical fibre for ska using advanced modulation flexible spectrum technology.
Degree: 2020, Nelson Mandela Metropolitan University
URL: http://hdl.handle.net/10948/50666
► Flexible Spectrum Dense Wavelength Division Multiplexed (DWDM) optical fibre networks are next-generation technology for handling extremely high data rates of the kind produced by MeerKAT…
(more)
▼ Flexible Spectrum Dense Wavelength Division Multiplexed (DWDM) optical fibre networks are next-generation technology for handling extremely high data rates of the kind produced by MeerKAT and SKA.We optimise the flexible spectrum for real-time dynamic channel wavelength assignment, to ensure optimum network performance. We needed to identify and develop novel hardware and dynamic algorithms for these networks to function optimally to perform critical tasks. Such tasks include wavelength assignment, signal routing, network restoration and network protection. The antennas of the Square Kilometre Array (SKA) network connect to the correlator and data processor in a simple point-to-point fixed configuration. The connection of the astronomer users to the data processor, however, requires a more complex network architecture. This is because the network has users scattered around South Africa, Africa and the whole world. This calls for upgrade of the classical fixed wavelength spectrum grids, to flexible spectrum grid that has improved capacity, reliable, simple and cost-effectiveness through sharing of network infrastructure. The exponential growth of data traffic in current optical communication networks requires higher capacity for the bandwidth demands at a reduced cost per bit. All-optical signal processing is a promising technique to improve network resource utilisation and resolve wavelength contention associated with the flexible spectrum. Flexible Spectrum Dense Wavelength Division Multiplexed (DWDM) optical fibre networks are next-generation technology for handling extremely high data rates of the kind produced by MeerKAT and SKA. Each DWDM channel is capable of 10 Gbps transmission rate, which is sliceable into finer flexible grid 12.5 GHz granularity to offer the network elastic spectrum and channel spacing capable of signal routing and wavelength switching for the scalability of aggregate bandwidth. The variable-sized portions of the flexible spectrum assignment to end users at different speeds depend on bandwidth demand, allowing efficient utilisation of the spectrum resources. The entire bandwidth of dynamic optical connections must be contiguously allocated. However, there is an introduction of spectrum fragmentation due to spectrum contiguity related to the optical channels having different width. Thus large traffic demands are likely to experience blocking regardless of available bandwidth. To minimise the congestion and cost-effectively obtain high performance, the optical network must be reconfigurable, achievable by adding wavelength as an extra degree of freedom for effectiveness. This can introduce colourless, directionless and contentionless reconfigurability to route individual wavelengths from fibre to fibre across multiple nodes to avoid wavelength blocking/collisions, increasing the flexibility and capacity of a network. For these networks to function optimally, novel hardware and dynamic algorithms identification and development is a critical task. Such tasks include wavelength assignment,…
Subjects/Keywords: Fiber optics
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APA (6th Edition):
Dlamini, P. P. (2020). Data transport over optical fibre for ska using advanced modulation flexible spectrum technology. (Thesis). Nelson Mandela Metropolitan University. Retrieved from http://hdl.handle.net/10948/50666
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dlamini, Phumla Patience. “Data transport over optical fibre for ska using advanced modulation flexible spectrum technology.” 2020. Thesis, Nelson Mandela Metropolitan University. Accessed April 16, 2021.
http://hdl.handle.net/10948/50666.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dlamini, Phumla Patience. “Data transport over optical fibre for ska using advanced modulation flexible spectrum technology.” 2020. Web. 16 Apr 2021.
Vancouver:
Dlamini PP. Data transport over optical fibre for ska using advanced modulation flexible spectrum technology. [Internet] [Thesis]. Nelson Mandela Metropolitan University; 2020. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10948/50666.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dlamini PP. Data transport over optical fibre for ska using advanced modulation flexible spectrum technology. [Thesis]. Nelson Mandela Metropolitan University; 2020. Available from: http://hdl.handle.net/10948/50666
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universitat Politècnica de València
8.
Zamorano Cantó, Manuel.
INVESTIGACIÓN CON FIBRA RECICLADA DE NEUMÁTICO (F.R.N.) PARA APLICACIONES ACÚSTICAS.
Degree: 2016, Universitat Politècnica de València
URL: http://hdl.handle.net/10251/61972
► [EN] ABSTRACT The behaviour of different types of textile fibres, obtained from extraction and separation methods in the recycling processes of ELT (End of life…
(more)
▼ [EN] ABSTRACT
The behaviour of different types of textile fibres, obtained from extraction and separation methods in the recycling processes of ELT (End of life tyres) (from now on "fluff"), as acoustic absorbent material has been studied in this research work.
This work is a starting point for the study of the use of this type of materials in architectural acoustics applications.
Experimental design was used to study the relevance of the forming conditions: pressure, time and temperature variables. The adjustment of the manufacturing variables: different temperature range, curing time, fluff mass variation, and compaction factor were studied in order to investigate the relation of these parameters to the acoustic intrinsic properties: porosity, tortuosity and air flow permeability. The objective was to achieve the best conditions in the production of panels with the best sound absorbent qualities within the widest frequencies rank.
The production process was carried out by using an octahedral mould, made up of the enclosed body covered by a piston-like lid with downward-upward trajectory. Inside the mould a specific mass of fibres was homogeneously displayed, and then it was placed in a press with heated plates, using the piston to compress the fibres until the established level of pressure. Panels were obtained by applying the precise heating energy in order to reach the required temperature for each particular sample and remaining in these conditions during the fixed time.; [ES] RESUMEN
En este trabajo estudiamos el comportamiento como absorbentes acústicos de diferentes clases de fibras textiles, provenientes de métodos de extracción y separación en el reciclado de neumáticos fuera de uso, en adelante (fluff).
El trabajo es un punto de partida en el estudio de este tipo de materiales para su uso en aplicaciones de acústica arquitectónica.
Mediante diseño de experimentos, se estudia la influencia de las condiciones de conformación: presión, tiempo, temperatura, masa de fluff. Aplicando unas variables en los parámetros de conformado, variación de temperatura, variación de tiempo de exposición, variación de la masa de fluff, y variación del factor de conformación a fin de estudiar la relación de estos parámetros y las propiedades intrínsecas acústicas: porosidad, tortuosidad, permeabilidad al flujo de aire. Consiguiendo las condiciones más optimas, para la posterior conformación de un panel que obtenga las mejores cualidades absorbentes del sonido, en el mayor rango de frecuencias.
El proceso de conformado, se ha llevado a cabo mediante un molde ortoédrico, compuesto por el seno, cubierto por una tapadera tipo pistón descendente en el cual, se han dispuesto homogéneamente una determinada masa de fibras, el molde ha sido situado en una prensa con platos calefactores. Comprimiendo las fibras mediante el descenso del pistón hasta el nivel establecido, aplicándoles energía calorífica, hasta obtener la temperatura indicada en cada muestra, permaneciendo en estas condiciones durante un tiempo determinado.; [CAT]…
Advisors/Committee Members: Crespo Amorós, José Enrique (advisor), Nadal Gisbert, Antonio Vicente (advisor), Segura Alcaraz, Jorge Gabriel (advisor).
Subjects/Keywords: : ¿ground tyre rubber and fiber ¿;
" crum rubber and fiber¿;
¿fiber¿;
¿recycled fiber¿;
¿fluff¿;
¿impedance tube fiber¿;
¿absortion coefficient and fiber¿.
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APA (6th Edition):
Zamorano Cantó, M. (2016). INVESTIGACIÓN CON FIBRA RECICLADA DE NEUMÁTICO (F.R.N.) PARA APLICACIONES ACÚSTICAS.
(Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/61972
Chicago Manual of Style (16th Edition):
Zamorano Cantó, Manuel. “INVESTIGACIÓN CON FIBRA RECICLADA DE NEUMÁTICO (F.R.N.) PARA APLICACIONES ACÚSTICAS.
” 2016. Doctoral Dissertation, Universitat Politècnica de València. Accessed April 16, 2021.
http://hdl.handle.net/10251/61972.
MLA Handbook (7th Edition):
Zamorano Cantó, Manuel. “INVESTIGACIÓN CON FIBRA RECICLADA DE NEUMÁTICO (F.R.N.) PARA APLICACIONES ACÚSTICAS.
” 2016. Web. 16 Apr 2021.
Vancouver:
Zamorano Cantó M. INVESTIGACIÓN CON FIBRA RECICLADA DE NEUMÁTICO (F.R.N.) PARA APLICACIONES ACÚSTICAS.
[Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2016. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10251/61972.
Council of Science Editors:
Zamorano Cantó M. INVESTIGACIÓN CON FIBRA RECICLADA DE NEUMÁTICO (F.R.N.) PARA APLICACIONES ACÚSTICAS.
[Doctoral Dissertation]. Universitat Politècnica de València; 2016. Available from: http://hdl.handle.net/10251/61972
Mississippi State University
9.
Scott, Dylan Andrew.
Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete.
Degree: MS, Mechanical Engineering, 2017, Mississippi State University
URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/
;
► By adding annealed plain carbon steel fibers and stainless steel fibers into Ultra-High Performance Concrete (UHPC), we have increased UHPCs toughness through optimized thermal processing…
(more)
▼ By adding annealed plain carbon steel fibers and stainless steel fibers into Ultra-High Performance Concrete (UHPC), we have increased UHPCs toughness through optimized thermal processing and alloy selection of steel
fiber reinforcements. Currently, steel
fiber reinforcements used in UHPCs are extremely brittle and have limited energy dissipation mainly through debonding due to matrix crumbling with some pullout. Implementing optimized heat treatments and selecting proper alternative alloys can drastically improve the post-yield carrying capacity of UHPCs for static and dynamic applications through plastic deformations, phase transformations, and
fiber pullout. By using a phase transformable stainless steel, the ultimate flexural strength increased from 32.0 MPa to 42.5 MPa (33%) and decreased the post-impact or residual projectile velocity measurements an average of 31.5 m/s for 2.54 cm and 5.08 cm thick dynamic impact panels.
Advisors/Committee Members: Dr. Mark F. Horstemeyer (chair), Dr. Robert D. Moser (committee member), Dr. Isaac Howard (committee member), Dr. Youssef Hammi (committee member).
Subjects/Keywords: UHPC; steel fiber reinforcement; fiber reinforced concrete
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APA (6th Edition):
Scott, D. A. (2017). Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;
Chicago Manual of Style (16th Edition):
Scott, Dylan Andrew. “Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete.” 2017. Masters Thesis, Mississippi State University. Accessed April 16, 2021.
http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;.
MLA Handbook (7th Edition):
Scott, Dylan Andrew. “Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete.” 2017. Web. 16 Apr 2021.
Vancouver:
Scott DA. Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete. [Internet] [Masters thesis]. Mississippi State University; 2017. [cited 2021 Apr 16].
Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;.
Council of Science Editors:
Scott DA. Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete. [Masters Thesis]. Mississippi State University; 2017. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;
Cornell University
10.
Cheng, Ji.
Experimental Studies On Single-Mode And Intermodal Nonlinear Optics In Higher-Order-Mode Fiber.
Degree: PhD, Biophysics, 2012, Cornell University
URL: http://hdl.handle.net/1813/31433
► The higher-order-mode (HOM) fiber has recently received great attention due to its special optical properties. The most significant one is its capability of propagating different…
(more)
▼ The higher-order-mode (HOM)
fiber has recently received great attention due to its special optical properties. The most significant one is its capability of propagating different modes, which is now being utilized to increase data transmission capacity in telecommunication through mode-division multiplexing. Furthermore, the LP02 mode of the
fiber can be designed to provide dispersion characteristics dramatically different from conventional step-index single-mode fibers (SMFs), such as anomalous dispersion below 1300 nm. This feature has also been widely utilized in a number of applications, including dispersion compensation, high energy pulsedelivery, and nonlinear wavelength conversion. In all the existing applications of the HOM fibers, however, coupling between different guided modes is not desirable, and thus avoided. In order to minimize mode coupling induced by waveguide perturbation, HOM fibers are designed such that the modes have very different effective refractive indices (neff) at the wavelengths of operation. Consequently, optical effects involve multiple modes, especially multimode nonlinear effects, in the HOM
fiber have rarely been explored. This work focuses on the nonlinear wavelength conversion effects in HOM fibers, including soliton self-frequency shift (SSFS), Cerenkov radiation, and four- wave mixing (FWM), in both single-mode and multimode schemes. We experimentally demonstrate four nonlinear effects with HOM fibers: 1) SSFS below 800 nm and efficient Cerenkov radiation in the vicinity of 850 nm; 2) high-energy soliton generation at 1080 nm; 3) Intermodal FWM in an all-
fiber laser system; 4) Intermodal Cerenkov radiation. In addition, we have developed a convenient dispersion measurement technique specifically tailored for HOM
fiber. The results of these experimental demonstrations may lead to potential applications in both biomedical imaging and telecommunication.
Advisors/Committee Members: Xu, Chunhui (chair), Zipfel, Warren R. (committee member), Lipson, Michal (committee member).
Subjects/Keywords: Nonlinear Fiber Optics; Higher-order-mode Fiber
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APA (6th Edition):
Cheng, J. (2012). Experimental Studies On Single-Mode And Intermodal Nonlinear Optics In Higher-Order-Mode Fiber. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/31433
Chicago Manual of Style (16th Edition):
Cheng, Ji. “Experimental Studies On Single-Mode And Intermodal Nonlinear Optics In Higher-Order-Mode Fiber.” 2012. Doctoral Dissertation, Cornell University. Accessed April 16, 2021.
http://hdl.handle.net/1813/31433.
MLA Handbook (7th Edition):
Cheng, Ji. “Experimental Studies On Single-Mode And Intermodal Nonlinear Optics In Higher-Order-Mode Fiber.” 2012. Web. 16 Apr 2021.
Vancouver:
Cheng J. Experimental Studies On Single-Mode And Intermodal Nonlinear Optics In Higher-Order-Mode Fiber. [Internet] [Doctoral dissertation]. Cornell University; 2012. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1813/31433.
Council of Science Editors:
Cheng J. Experimental Studies On Single-Mode And Intermodal Nonlinear Optics In Higher-Order-Mode Fiber. [Doctoral Dissertation]. Cornell University; 2012. Available from: http://hdl.handle.net/1813/31433
Texas A&M University
11.
Hosseinali, Farzad.
Surface Attributes and Multiscale Frictional Properties of Cotton (Gossypium Hirsutum L.) Fibers.
Degree: PhD, Biological and Agricultural Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/173290
► Frictional properties of fiber assemblies from different cotton varieties were investigated using a sliding friction tester. Results indicated that frictional characteristics of cotton fibers varied…
(more)
▼ Frictional properties of
fiber assemblies from different cotton varieties were investigated using a sliding friction tester. Results indicated that frictional characteristics of cotton fibers varied significantly among varieties. A significant, negative correlation between friction coefficient (μ) and
fiber yellowness and a strong positive correlation between μ and short-
fiber content were observed. Multilinear regression analysis showed that
fiber friction is a complex phenomenon that depends on
fiber dimensional, mechanical, and surface properties. In addition, a
fiber simulation model was developed to explain the partial relationships between the
fiber dimensional properties and its frictional characteristics. The model shows that, for assemblies of fibers with the same mass and equal average mean length, the true contact area increases with decreasing
fiber maturity and fineness.
In the second phase of this research, surface of cotton fibers from two different samples—with statistically distinct macroscale frictional properties—were further characterized at the nanoscale using various atomic force microscope (AFM) operation modes. A cotton
fiber surface is naturally coated with a few hundred nanometer-thick layer of lipids, fatty acids, alcohols, and pectins, collectively called the cotton cuticular wax. Surface topography and friction images of the fibers were obtained with conventional contact mode AFM. The nanomechanical property images—such as adhesion and deformation—were obtained in force tapping mode. The results indicate that fibers with higher macroscale friction were also associated with higher nanoscale friction, adhesion, and deformation. The differences in nanoscale friction, adhesion, and deformation signals is attributed to
fiber surface hydrophobicity and stiffness, which in turn may depend on the waxy layer thickness, fatty acids hydrocarbon chain length, and film viscosity.
Advisors/Committee Members: Thomasson, John A (advisor), Batteas, James D (committee member), Hequet, Eric F (committee member), Fernando, Sandun (committee member).
Subjects/Keywords: Cotton fiber; Friction; Fiber Modeling; Nanofriction
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APA (6th Edition):
Hosseinali, F. (2018). Surface Attributes and Multiscale Frictional Properties of Cotton (Gossypium Hirsutum L.) Fibers. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173290
Chicago Manual of Style (16th Edition):
Hosseinali, Farzad. “Surface Attributes and Multiscale Frictional Properties of Cotton (Gossypium Hirsutum L.) Fibers.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 16, 2021.
http://hdl.handle.net/1969.1/173290.
MLA Handbook (7th Edition):
Hosseinali, Farzad. “Surface Attributes and Multiscale Frictional Properties of Cotton (Gossypium Hirsutum L.) Fibers.” 2018. Web. 16 Apr 2021.
Vancouver:
Hosseinali F. Surface Attributes and Multiscale Frictional Properties of Cotton (Gossypium Hirsutum L.) Fibers. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1969.1/173290.
Council of Science Editors:
Hosseinali F. Surface Attributes and Multiscale Frictional Properties of Cotton (Gossypium Hirsutum L.) Fibers. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173290
University of Johannesburg
12.
Kritzinger, Ronnie.
Manufacturing of azimuthally symmetric long-period fibre gratings using a CO2 laser.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/6675
► M.Ing.
The development of fibre optic technology as we know it today, has taken a giant leap forward since the introduction of Internet technology and…
(more)
▼ M.Ing.
The development of fibre optic technology as we know it today, has taken a giant leap forward since the introduction of Internet technology and other telecommunication devices. More recently, the need exists to retrieve and send huge amounts of data fast and efficiently by using fibre optic cable in computer networks, without the need of expensive equipment. Due to the large amounts of data (like video and audio) that has to be sent and received across a computer network at large distances, this dissertation is primarily concerned with the design and manufacturing of low-loss uniform long period fibre gratings for the realization of future optical add/drop multiplexers. An azimuthally symmetric manufacturing method is implemented using several optical components and devices. Several electronic devices are connected to a Mannesmann Rexroth ECODRIVE03 drive controller unit, and a computer control program was written in VISUAL BASIC 6.0 to control these devices during the manufacturing of these unique LPGs. A number of theories and numerical methods such as the coupled-mode theory and the transfer matrix method are applied in the analysis, modelling, and simulation of short/long-period fibre gratings. Simulation results were obtained in MATLAB 6.5 and the code was written in such a way that the end user could simulate any short/long-period grating and obtain the necessary results such as the transmission spectra, time delay and dispersion for uniform fibre gratings. These simulations obtained were a good indication on how the experimental results should look after manufacturing the unique symmetric LPGs.
Subjects/Keywords: Optical communications; Optical fiber detectors; Fiber optics
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APA (6th Edition):
Kritzinger, R. (2012). Manufacturing of azimuthally symmetric long-period fibre gratings using a CO2 laser. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/6675
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kritzinger, Ronnie. “Manufacturing of azimuthally symmetric long-period fibre gratings using a CO2 laser.” 2012. Thesis, University of Johannesburg. Accessed April 16, 2021.
http://hdl.handle.net/10210/6675.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kritzinger, Ronnie. “Manufacturing of azimuthally symmetric long-period fibre gratings using a CO2 laser.” 2012. Web. 16 Apr 2021.
Vancouver:
Kritzinger R. Manufacturing of azimuthally symmetric long-period fibre gratings using a CO2 laser. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10210/6675.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kritzinger R. Manufacturing of azimuthally symmetric long-period fibre gratings using a CO2 laser. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/6675
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
13.
Chtcherbakov, Anatoli Aleksandrovich.
Reflective interferometric fibre optic sensors.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/5707
► D.Ing.
This work comprises a study of reflective interferometric fibre optic sensors. The use of Bragg gratings, multilayer quarter-wave stacks, and rugate mirrors for fibre…
(more)
▼ D.Ing.
This work comprises a study of reflective interferometric fibre optic sensors. The use of Bragg gratings, multilayer quarter-wave stacks, and rugate mirrors for fibre optic sensing applications is discussed in this work. Rugate mirrors are presented in more detail since they form an important part of the research. The control system for an electron cyclotron resonance plasma enhanced chemical vapour deposition reactor was developed for the growth of inhomogeneous dielectric filters. The system is intended to control the growth of films of the required refractive index profile for optical applications on different substrates including fibre ends. The system also includes an automatic microwave tuner. Rugate mirrors deposited directly on optical fibre were used in a dual cavity Fabry- Perot interferometric strain sensor. It was found by computer simulation that reflectances of 40% for the two outer mirrors and 68% for the centre mirror allow the interferometer to have maximum fringe amplitude. The sensor was evaluated experimentally as a strain gauge. The maximum strain applied to the sample was about 0.12% and the corresponding phase change was about 800 radians. The discrepancy between the readings of this sensor and those of a resistive strain gauge, applied to the same structure, did not exceed 5%. Two novel fibre optic sensors were developed during this work: a merged Sagnac- Michelson interferometric sensor for distributed disturbance detection, and a disturbance location sensor using modified Sagnac and Mach-Zehnder interferometers. Both are intended for distributed impact location along the fibre. The magnitude of impact can also be measured with these sensors. The merged Sagnac-Michelson interferometric sensor uses two light sources and a frequency selective mirror to separate the Michelson and Sagnac signals. Birefringence in the fibre was used to bias the Sagnac interferometer to have a sine response. Computer simulations yielded the optimal biasing conditions: the state of linear polarisation of the input light should be rotated by r/4 with respect to the horizontal axis; birefringence in the Sagnac loop must provide retardation of ff/2 with the optical axes rotated by K/4 with respect to the horizontal axis. We verified the sensor concept experimentally. The discrepancy between measured and actual locations of disturbances applied to the fibre did not exceed 2.5 m for a 200 m long sensing loop. The sensor using the modified Sagnac and Mach-Zehnder interferometers makes use of phase modulation and synchronous detection to obtain the sine-biased Sagnac signal. A modified Sagnac interferometer configuration that incorporates an additional coupler and a mirror, allows separation of the Sagnac and Mach-Zehnder signals. Operation of the new configuration was verified experimentally in the system with a sensing fibre of 100 m long. The discrepancy between measured and actual locations of disturbances applied to the fibre did not exceed 2 m.
Subjects/Keywords: Fiber optics.; Interferometers.; Optical fiber detectors.
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Export
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Manager
APA (6th Edition):
Chtcherbakov, A. A. (2012). Reflective interferometric fibre optic sensors. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/5707
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chtcherbakov, Anatoli Aleksandrovich. “Reflective interferometric fibre optic sensors.” 2012. Thesis, University of Johannesburg. Accessed April 16, 2021.
http://hdl.handle.net/10210/5707.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chtcherbakov, Anatoli Aleksandrovich. “Reflective interferometric fibre optic sensors.” 2012. Web. 16 Apr 2021.
Vancouver:
Chtcherbakov AA. Reflective interferometric fibre optic sensors. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10210/5707.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chtcherbakov AA. Reflective interferometric fibre optic sensors. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/5707
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
14.
Zhang, Yiwei.
Interferometric Distributed Fiber Optic Sensing.
Degree: 2014, University of Toronto
URL: http://hdl.handle.net/1807/67973
► This thesis studies single-arm frequency-shifted interferometry (SA-FSI), a simple, compact, practical and versatile fiber optic sensing technique which has many advantages over conventional techniques. We…
(more)
▼ This thesis studies single-arm frequency-shifted interferometry (SA-FSI), a simple, compact, practical and versatile fiber optic sensing technique which has many advantages over conventional techniques. We further developed the theory of SA-FSI, and successfully demonstrate that SA-FSI can achieve long distance and high sensitivity sensing multiplexing.In this thesis work, we also build a model of the working principle of a distributed vibration sensing system developed by QPS Photronics Inc., and explore its sensing features. Three different types of reflective terminations (a QPS VibroFibre sensor, a flat end fiber, and a loop mirror) have been used in our experiments. Experimental results for these three reflective terminations are consistent with simulation results based on our model.
M.A.S.
Advisors/Committee Members: Qian, Li, Electrical and Computer Engineering.
Subjects/Keywords: Fiber optics; Fiber optic sensing; Multiplexing; 0544
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APA (6th Edition):
Zhang, Y. (2014). Interferometric Distributed Fiber Optic Sensing. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/67973
Chicago Manual of Style (16th Edition):
Zhang, Yiwei. “Interferometric Distributed Fiber Optic Sensing.” 2014. Masters Thesis, University of Toronto. Accessed April 16, 2021.
http://hdl.handle.net/1807/67973.
MLA Handbook (7th Edition):
Zhang, Yiwei. “Interferometric Distributed Fiber Optic Sensing.” 2014. Web. 16 Apr 2021.
Vancouver:
Zhang Y. Interferometric Distributed Fiber Optic Sensing. [Internet] [Masters thesis]. University of Toronto; 2014. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1807/67973.
Council of Science Editors:
Zhang Y. Interferometric Distributed Fiber Optic Sensing. [Masters Thesis]. University of Toronto; 2014. Available from: http://hdl.handle.net/1807/67973
University of Arizona
15.
Song, Jiawei.
Nd-doped Fiber Lasers and Fiber Amplifiers at 9xx nm
.
Degree: 2016, University of Arizona
URL: http://hdl.handle.net/10150/620827
► The lasers operating in the wavelength range of 900 - 1000 nm have caused intense attention because they are in great demands for: 1. Highpower…
(more)
▼ The lasers operating in the wavelength range of 900 - 1000 nm have caused intense attention because they are in great demands for: 1. Highpower blue and deep UV laser generation 2. High power single-mode pump laser source 3. Light detection and Lidar , etc. And now, there are actually many different types of lasers can generate laser in this wavelength range. For example, Nd and Yb doped
fiber laser, Nd and Yb doped glass and crystal lasers, OPO and SHG laser, etc. Among all this options, we decided to study the Nd-doped
fiber laser for their outstanding advantages: 1. As
fiber laser, it possess all the advantages of any
fiber lasers have, such as: high power scalability, excellent beam quality, high spectral and intensity stability, super compactness, robustness and reliability. 2. Comparing to other rare-earth-ion, the Nd
3+ ions have a more broad emission wavelength range from 900-950 nm. My goals for doing this thesis research are:1.Experimentally and theoretically investigate Nd-doped
fiber lasers and amplifiers at 9xx nm. 2. Develop 9xx nm single frequency
fiber lasers and amplifiers. 3.Obtain directions for developing high power single-frequency Nd-doped
fiber laser sources at 9xx nm. To achieve these goals, 1. Nd-doped
fiber lasers at 934 nm were investigated. 2. Core-pumped and cladding-pumped Nd-doped
fiber amplifiers are also investigated. 3. The simulation of the Nd-doped
fiber amplifiers have been done.
Advisors/Committee Members: Zhu, Xiushan (advisor), Peyghambarian, Nasser (advisor), Liang, Rongguang (committeemember).
Subjects/Keywords: Fiber Laser;
Optical Sciences;
Fiber Amplifier
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APA (6th Edition):
Song, J. (2016). Nd-doped Fiber Lasers and Fiber Amplifiers at 9xx nm
. (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/620827
Chicago Manual of Style (16th Edition):
Song, Jiawei. “Nd-doped Fiber Lasers and Fiber Amplifiers at 9xx nm
.” 2016. Masters Thesis, University of Arizona. Accessed April 16, 2021.
http://hdl.handle.net/10150/620827.
MLA Handbook (7th Edition):
Song, Jiawei. “Nd-doped Fiber Lasers and Fiber Amplifiers at 9xx nm
.” 2016. Web. 16 Apr 2021.
Vancouver:
Song J. Nd-doped Fiber Lasers and Fiber Amplifiers at 9xx nm
. [Internet] [Masters thesis]. University of Arizona; 2016. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10150/620827.
Council of Science Editors:
Song J. Nd-doped Fiber Lasers and Fiber Amplifiers at 9xx nm
. [Masters Thesis]. University of Arizona; 2016. Available from: http://hdl.handle.net/10150/620827
Virginia Tech
16.
Yu, Li.
Multi-Material Fiber Fabrication and Applications in Distributed Sensing.
Degree: PhD, Electrical Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/99380
► Distributed sensing has been an attractive alternative to the traditional single-point sensing technology when measurement at multiple locations is required. Traditional distributed sensing methods based…
(more)
▼ Distributed sensing has been an attractive alternative to the traditional single-point sensing technology when measurement at multiple locations is required. Traditional distributed sensing methods based on silica optical
fiber and electric coaxial cables have some limitations for specific applications, such as in smart textiles and wearable sensors. By adopting the
fiber thermal drawing technique, we have designed and fabricated multi-material electrode-embedded polymer fibers with distributed sensing capabilities. Polymers sensitive to temperature and pressure have been incorporated into the
fiber structure, and thin metal electrodes placed inside
fiber by convergence drawing have enabled detection of local impedance change with electrical reflectometry. We have demonstrated that these fibers can detect temperature and pressure change with high spatial resolution. We have also explored the possibility of using polymer optical
fiber in a Raman scattering based distributed temperature sensing system. Stokes and Anti-Stokes signals of a PMMA
fiber illuminated by a 532 nm pulsed laser was recorded, and the ratio was used to indicate local temperature change. We have also developed a unique way to fabricate porous polymer by thermal drawing polymer materials with controlled water content in the polymer. The porous fibers were loaded with a fluorescent dye, and its release in tissue phantoms and murine tumors was observed. The work has broadened the scope of multi-material, multi-functional
fiber and may shed light on the development of novel smart textile devices.
Advisors/Committee Members: Wang, Anbo (committeechair), Zhu, Yizheng (committee member), Jia, Xiaoting (committee member), Pickrell, Gary R. (committee member), Lester, Luke F. (committee member).
Subjects/Keywords: Distributed sensor; multi-material fiber; porous fiber
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APA (6th Edition):
Yu, L. (2019). Multi-Material Fiber Fabrication and Applications in Distributed Sensing. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/99380
Chicago Manual of Style (16th Edition):
Yu, Li. “Multi-Material Fiber Fabrication and Applications in Distributed Sensing.” 2019. Doctoral Dissertation, Virginia Tech. Accessed April 16, 2021.
http://hdl.handle.net/10919/99380.
MLA Handbook (7th Edition):
Yu, Li. “Multi-Material Fiber Fabrication and Applications in Distributed Sensing.” 2019. Web. 16 Apr 2021.
Vancouver:
Yu L. Multi-Material Fiber Fabrication and Applications in Distributed Sensing. [Internet] [Doctoral dissertation]. Virginia Tech; 2019. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10919/99380.
Council of Science Editors:
Yu L. Multi-Material Fiber Fabrication and Applications in Distributed Sensing. [Doctoral Dissertation]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/99380
University of Texas – Austin
17.
Appaiah, Kumar.
Signal processing and incoherent-MIMO for multimode optical fibers.
Degree: PhD, Electrical and Computer Engineering, 2013, University of Texas – Austin
URL: http://hdl.handle.net/2152/25113
► Multimode fibers (MMF) are generally used in short and medium haul optical networks owing to the availability of low cost devices and inexpensive packaging solutions.…
(more)
▼ Multimode fibers (MMF) are generally used in short and medium haul optical networks owing to the availability of low cost devices and inexpensive packaging solutions. However, the performance of conventional multimode fibers is limited primarily by the presence of high modal dispersion owing to large core diameters. While electronic dispersion compensation methods improve the bandwidth-distance product of MMFs, they do not utilize the fundamental diversity present in the different modes of the multimode
fiber. This thesis draws from developments in wireless communication theory and signal processing to motivate the use of multiple-input multiple-output (MIMO) and signal processing techniques in MMF links. MIMO techniques that utilize the diversity of modes present in the
fiber increase data rates and link reliability. Theoretical models for propagation effects in MMF systems are used to analyze and design the geometry of laser and detector arrays for MIMO-MMF links, and study how the design of these arrays impacts link performance. These models are also used to develop and evaluate low-complexity algorithms that efficiently utilize dense detector arrays, with "greedy subset selection" based on submodular optimization. Experimental evaluation of 1 × 1, 2 × 2, 3 × 3 and 4 × 4 MIMO systems have been conducted over various MMF media, including 100 m - 3 km silica MMF with externally modulated distributed feedback lasers and directly modulated vertical cavity surface emitting lasers (VCSELs), as well as with Fabry Perot lasers over 10 m - 100 m plastic MMF. The use of off-the-shelf components as well as the role of axial offset coupling in enhancing modal diversity has been experimentally quantified. The experimental techniques discussed in this thesis have enabled an increase of over 25× in the bandwidth-distance product of the MMF link, when compared to currently deployed MMF systems, such as 10GBASE-SR.
Advisors/Committee Members: Vishwanath, Sriram (advisor), Bank, Seth Robert (advisor).
Subjects/Keywords: Fiber optics; Multimode fiber; Modulation; Communication; Multiplexing
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APA (6th Edition):
Appaiah, K. (2013). Signal processing and incoherent-MIMO for multimode optical fibers. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/25113
Chicago Manual of Style (16th Edition):
Appaiah, Kumar. “Signal processing and incoherent-MIMO for multimode optical fibers.” 2013. Doctoral Dissertation, University of Texas – Austin. Accessed April 16, 2021.
http://hdl.handle.net/2152/25113.
MLA Handbook (7th Edition):
Appaiah, Kumar. “Signal processing and incoherent-MIMO for multimode optical fibers.” 2013. Web. 16 Apr 2021.
Vancouver:
Appaiah K. Signal processing and incoherent-MIMO for multimode optical fibers. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2013. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/2152/25113.
Council of Science Editors:
Appaiah K. Signal processing and incoherent-MIMO for multimode optical fibers. [Doctoral Dissertation]. University of Texas – Austin; 2013. Available from: http://hdl.handle.net/2152/25113
NSYSU
18.
Shin, Chun-Sheng.
Fiber Laser Sensor using PCF-based Mach-Zehnder Interferometer Formed by Misalinged Splicing.
Degree: Master, Electro-Optical Engineering, 2015, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0623115-001116
► Optical sensors based on fiber interferometers have been investigated extensively due to their significant advantages of compact size, low cost and immunity to electromagnetic interference.…
(more)
▼ Optical sensors based on
fiber interferometers have been investigated extensively due to their significant advantages of compact size, low cost and immunity to electromagnetic interference. However, their accuracy is poor due to the broad 3-dB bandwidth and low extinction ratio of the interference spectrum. In this dissertation, we fabricate a
fiber Mach-Zehnder interferometer (MZI) by splicing a photonic crystal
fiber (PCF) with SMFs with an offset. Due to the misalignment of the two fibers, the input light from the SMF will induce the core mode and cladding mode of the PCF with different propagation velocities. These two modes are coupled back to the other SMF to form the interference spectrum due to the accumulated phase difference. We then place the PCF-based MZI into an erbium-doped
fiber ring laser to form the
fiber laser sensor. Compared with the spectrum of the PCF-based MZI, the lasing peak of the
fiber laser sensor has high signal to noise ratio (40dB) and narrow 3-dB bandwidth (<1nm), which can enhance the sensing accuracy.
We have demonstrated the sensing properties of our PCF-based MZI
fiber laser sensor for temperature, bending curvature and surrounding refractive index. The temperature sensitivity of the PCF-based MZI
fiber laser sensor is about 5pm/oC between 30 °C to 150 °C. As we increase the bending curvature from 0.6925m-1 to 3.096m-1, it is observed that the lasing wavelength is exponentially increased. In addition, the measured refractive-index sensitivity is about 52.35nm/RIU as the surrounding refractive index is varied from 1.3388 to 1.3638. As a result, our proposed PCF-based MZI
fiber laser sensors can be utilized as useful sensors which have high signal to noise ratio and narrow 3-dB bandwidth to enhance the sensing accuracy.
Advisors/Committee Members: Yung-Jr Hung (chair), Chin-Ping Yu (committee member), Jui-Yang Feng (chair), Hung-wen Chang (chair).
Subjects/Keywords: fiber laser sensor; fiber laser; fiber sensor; Photonic crystal fiber; Mach-Zehnder interferometer
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APA (6th Edition):
Shin, C. (2015). Fiber Laser Sensor using PCF-based Mach-Zehnder Interferometer Formed by Misalinged Splicing. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0623115-001116
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shin, Chun-Sheng. “Fiber Laser Sensor using PCF-based Mach-Zehnder Interferometer Formed by Misalinged Splicing.” 2015. Thesis, NSYSU. Accessed April 16, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0623115-001116.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shin, Chun-Sheng. “Fiber Laser Sensor using PCF-based Mach-Zehnder Interferometer Formed by Misalinged Splicing.” 2015. Web. 16 Apr 2021.
Vancouver:
Shin C. Fiber Laser Sensor using PCF-based Mach-Zehnder Interferometer Formed by Misalinged Splicing. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Apr 16].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0623115-001116.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shin C. Fiber Laser Sensor using PCF-based Mach-Zehnder Interferometer Formed by Misalinged Splicing. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0623115-001116
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
19.
Sabeel ahmed K.
Investigations on mechanical Performance characteristics
of Jute glass fiber hybrid composites;.
Degree: Investigations on mechanical Performance
characteristics of Jute glass fiber hybrid composites, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/26492
► Fiber reinforced composites have emerged as a major class of newlinestructural material in many weight critical components in aerospace newlineautomotive and other industrial sectors due…
(more)
▼ Fiber reinforced composites have emerged as a major
class of newlinestructural material in many weight critical
components in aerospace newlineautomotive and other industrial
sectors due to their advantages like high newlinestrength to weight
ratio high stiffness to weight ratio good wear and newlinecorrosion
resistance high temperature resistance etc Despite several
newlineadvantages they have certain drawbacks which include high
cost abrasive newlinenature high energy consumption during
processing non biodegradability newlinenon renewability scarcity
etc These drawbacks limit the use of conventional newlinefiber
composites mainly for aerospace and military applications where
high newlinecost of the fiber is not of high importanc newline
newline newline
appendix p197-205, reference
p206-217.
Advisors/Committee Members: Vijayarangan S.
Subjects/Keywords: Jute glass fiber
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Manager
APA (6th Edition):
K, S. a. (2014). Investigations on mechanical Performance characteristics
of Jute glass fiber hybrid composites;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/26492
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
K, Sabeel ahmed. “Investigations on mechanical Performance characteristics
of Jute glass fiber hybrid composites;.” 2014. Thesis, Anna University. Accessed April 16, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/26492.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
K, Sabeel ahmed. “Investigations on mechanical Performance characteristics
of Jute glass fiber hybrid composites;.” 2014. Web. 16 Apr 2021.
Vancouver:
K Sa. Investigations on mechanical Performance characteristics
of Jute glass fiber hybrid composites;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Apr 16].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26492.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
K Sa. Investigations on mechanical Performance characteristics
of Jute glass fiber hybrid composites;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26492
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
20.
Liu, Yun Hua.
Molecular Basis of Quantitative Genetics Revealed by Cloning and Analysis of 474 Genes Controlling Fiber Length in Cotton.
Degree: PhD, Plant Breeding, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153405
► Cotton (Gossypium spp.) is a leading textile crop in the world, generating an annual economic benefit of over hundred billion USD. However, few genes controlling…
(more)
▼ Cotton (Gossypium spp.) is a leading textile crop in the world, generating an annual economic benefit of over hundred billion USD. However, few genes controlling
fiber quality and yield traits have been cloned and characterized to date. In this study, a large number of genes controlling the upper half mean length (UHML) of fibers were cloned using a newly-developed high-throughput gene and QTL cloning system and subjected to systems analysis. Furthermore, the molecular basis and regulation mechanisms of UHML were investigated using the cloned
fiber length genes.
A total of 474 GFL (Gossypium
Fiber Length) genes were cloned. The effect of each GFL gene on UHML varied from 2.64% to 7.92%. Of 474 GFL genes, 88.6% decreased UHML when turned on or actively expressed in the developing fibers at the 10 days post-anthesis (10-dpa), whereas only 11.4% increased UHML. The GFL genes encode proteins and enzymes that are involved in a variety of biological processes and metabolic pathways. The 474 GFL genes interacted to form an interaction network in the 10-dpa fibers, which suggests that UHML is the consequence of interactions among the GFL genes. In addition, the evolution of
fiber length was examined between diploid and tetraploid cottons using the GFL genes. The results showed that the variation of the GFL gene networks, including the number of genes and number of gene x gene interactions, also plays an important role in the variation of
fiber length during polyploidization.
Therefore, this study has, for the first time worldwide, cloned a large number of genes controlling UHML and deciphered the underlying molecular basis and regulation mechanisms, thus providing novel resources and knowledge for development of new toolkits for enhanced cotton
fiber breeding. The UHML is determined not only by its controlling genes, GFLs, but also by their actions, action directions and interactions. Moreover, the results of this study have not only provided a first line of evidence that a quantitative trait is controlled by a large number of genes, but also added new molecular basis, thus forming the molecular mechanisms of quantitative genetics.
Advisors/Committee Members: Zhang, Hongbin (advisor), Smith, C. Wayne (advisor), Hague, Steve (committee member), Yuan, Joshua (committee member).
Subjects/Keywords: Cotton; Fiber; UHML
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APA (6th Edition):
Liu, Y. H. (2014). Molecular Basis of Quantitative Genetics Revealed by Cloning and Analysis of 474 Genes Controlling Fiber Length in Cotton. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153405
Chicago Manual of Style (16th Edition):
Liu, Yun Hua. “Molecular Basis of Quantitative Genetics Revealed by Cloning and Analysis of 474 Genes Controlling Fiber Length in Cotton.” 2014. Doctoral Dissertation, Texas A&M University. Accessed April 16, 2021.
http://hdl.handle.net/1969.1/153405.
MLA Handbook (7th Edition):
Liu, Yun Hua. “Molecular Basis of Quantitative Genetics Revealed by Cloning and Analysis of 474 Genes Controlling Fiber Length in Cotton.” 2014. Web. 16 Apr 2021.
Vancouver:
Liu YH. Molecular Basis of Quantitative Genetics Revealed by Cloning and Analysis of 474 Genes Controlling Fiber Length in Cotton. [Internet] [Doctoral dissertation]. Texas A&M University; 2014. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1969.1/153405.
Council of Science Editors:
Liu YH. Molecular Basis of Quantitative Genetics Revealed by Cloning and Analysis of 474 Genes Controlling Fiber Length in Cotton. [Doctoral Dissertation]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153405
Texas A&M University
21.
Ng, Eng Hwa.
Genetics of Cotton Fiber Elongation.
Degree: PhD, Plant Breeding, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/151034
► Fiber elongation (ability to stretch before breaking) is one of the key components in determining overall yarn quality. Elongation in U.S. upland cotton (G. hirsutum…
(more)
▼ Fiber elongation (ability to stretch before breaking) is one of the key components in determining overall yarn quality. Elongation in U.S. upland cotton (G. hirsutum L.) has remained largely neglected due to: absence of monetary incentives for growers to produce high elongation cotton; lack of research interests among breeders; and absence of a reliable
fiber testing system for elongation. This study was conducted to determine the genetics of cotton
fiber elongation via a diallel and generation means analysis (GMA). Findings from this study should lay the foundation for future breeding work in cotton
fiber elongation.
Of the seven distinctive upland parents used for the diallel study, general combining ability was far more prominent than specific combing ability for
fiber elongation. Cultivar PSC 355 and Dever experimental line were the two parents identified as good combiners for
fiber elongation in this study. The slight negative correlation between
fiber elongation and strength remained true. Highly significant negative correlation was observed between
fiber upper half mean length and elongation. Both Stelometer and HVI elongation measurements correlated well with values of 0.85 and 0.82 in 2010 and 2011, respectively. For the six families used in the GMA analysis, additive genetic control was prevalent over dominance effect. Based on the scaling test, no significant epistatic interaction was detected for
fiber elongation. As expected, additive variance constituted a much larger portion of total genetic variation in
fiber elongation than the dominance variance. On average, larger numbers of effective factor were identified in
fiber elongation than all other
fiber traits tested, suggesting that parents used in the GMA study are carrying different genetic materials/ loci for
fiber elongation. Considerable gains in
fiber elongation may be achieved by selectively crossing these materials in a pure-line breeding scheme while holding other important
fiber traits constant.
Advisors/Committee Members: Smith, C. Wayne (advisor), Raj, Yog (committee member), Cothren, J. Tom (committee member), Hague, Steve (committee member), Hequet, Eric (committee member).
Subjects/Keywords: Cotton; Fiber elongation
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APA (6th Edition):
Ng, E. H. (2013). Genetics of Cotton Fiber Elongation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151034
Chicago Manual of Style (16th Edition):
Ng, Eng Hwa. “Genetics of Cotton Fiber Elongation.” 2013. Doctoral Dissertation, Texas A&M University. Accessed April 16, 2021.
http://hdl.handle.net/1969.1/151034.
MLA Handbook (7th Edition):
Ng, Eng Hwa. “Genetics of Cotton Fiber Elongation.” 2013. Web. 16 Apr 2021.
Vancouver:
Ng EH. Genetics of Cotton Fiber Elongation. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1969.1/151034.
Council of Science Editors:
Ng EH. Genetics of Cotton Fiber Elongation. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151034
McMaster University
22.
Yang, Chenyu.
DESIGN AND ANALYSIS OF FREQUENCY MODULATED FIBER-OPTIC COMMUNICATION SYSTEM.
Degree: MASc, 2016, McMaster University
URL: http://hdl.handle.net/11375/20410
► Despite the fact that frequency modulation (FM) was firstly applied to radio signaling 80 years ago (1936, by Edwin Howard Armstrong), it has never been…
(more)
▼ Despite the fact that frequency modulation (FM) was firstly applied to radio signaling 80 years ago (1936, by Edwin Howard Armstrong), it has never been deployed in fiber-optic communication systems. In this thesis, a novel frequency modulated fiber-optic communication system with optical discriminator is proposed. The noise configuration and anti-dispersion property of the FM system are investigated through an analytical model that has been derived and validated with numerical simulations. The performance of the proposed FM system is compared with an amplitude modulated (AM) fiber-optic communication system, owing to the fact that the widely used modulation formats, intensity modulation and quadrature amplitude modulation (QAM), can be extracted as a model of the basic AM format. Depending on the property of the filter, two types of frequency discriminators are discussed: the leading edge filter (LEF) and the tail edge filter (TEF). Since the amplified spontaneous emission (ASE) noise is averagely distributed without any frequency dependence, the noise characteristics are not affected by the choice of the frequency discriminator. However, when it comes to the dispersion impairment, the difference between two frequency discriminators is dramatic because the distortion induced by dispersion strongly hinges on the operated frequency.
The results show that, with the presence of noise, the proposed FM scheme can lead to one or two orders of magnitude enhancement in the system’s output signal-to-noise ratio (SNR) as compared to that of the conventional AM scheme. Also, with the presence of dispersion, it is proved that the span of the FM system can reliably reach 110km with bit rate up to 10Gbit/s, surpassing the AM system with a maximum signal reach of 70km. A real application, with the presence of both noise and dispersion, demonstrates the overall superiority of the FM system’s performance over that of the AM system. The obtained results suggest a promising future for the FM technique in fiber-optic communication.
Thesis
Master of Applied Science (MASc)
Advisors/Committee Members: Li, Xun, Electrical and Computer Engineering.
Subjects/Keywords: Fiber-optic communication
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APA (6th Edition):
Yang, C. (2016). DESIGN AND ANALYSIS OF FREQUENCY MODULATED FIBER-OPTIC COMMUNICATION SYSTEM. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/20410
Chicago Manual of Style (16th Edition):
Yang, Chenyu. “DESIGN AND ANALYSIS OF FREQUENCY MODULATED FIBER-OPTIC COMMUNICATION SYSTEM.” 2016. Masters Thesis, McMaster University. Accessed April 16, 2021.
http://hdl.handle.net/11375/20410.
MLA Handbook (7th Edition):
Yang, Chenyu. “DESIGN AND ANALYSIS OF FREQUENCY MODULATED FIBER-OPTIC COMMUNICATION SYSTEM.” 2016. Web. 16 Apr 2021.
Vancouver:
Yang C. DESIGN AND ANALYSIS OF FREQUENCY MODULATED FIBER-OPTIC COMMUNICATION SYSTEM. [Internet] [Masters thesis]. McMaster University; 2016. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/11375/20410.
Council of Science Editors:
Yang C. DESIGN AND ANALYSIS OF FREQUENCY MODULATED FIBER-OPTIC COMMUNICATION SYSTEM. [Masters Thesis]. McMaster University; 2016. Available from: http://hdl.handle.net/11375/20410
University of Johannesburg
23.
Booysen, Andre.
Sensor applications of a reflective fibre optic ring interferometer.
Degree: 2014, University of Johannesburg
URL: http://hdl.handle.net/10210/9775
► D.Ing. (Electrical and Electronic Engineering)
The subject of this research work was the reflective fibre optic ring interferometer utilizing allow coherence length source. The interferometer…
(more)
▼ D.Ing. (Electrical and Electronic Engineering)
The subject of this research work was the reflective fibre optic ring interferometer utilizing allow coherence length source. The interferometer consists of an interrogating fibre connected to a fibre ring via an input/output splitting coupler, and a reflector. The fibre ring is formed between one input and one output leg of a fibre coupler. The reflector can be of any type, including a fibre loop mirror, Faraday rotator mirror, a silvered fibre end-face or multilayer dielectric mirror deposited on the fibre end face. A theoretical treatment was developed for the interferometer. It was shown that the interferometer had a reflectance vs nonreciprocal phase shift characteristic, similar to that of a Fabry-Perot interferometer. Upon phase modulation of the interferometer quadrature terms were obtained at harmonics of the modulation frequency. It was shown that by decreasing the finesse of the sensor a quadrature phase tracker could be employed. The dependence of the sensor's reflectance, finesse and sensitivity on various system parameters were simulated with the aid of the abovementioned theory. A high finesse interferometer was proposed. It utilizes a fibre doped amplifier which would increase the sensitivity above that of a Sagnac interferometer. Intermediate and low finesse versions of the reflective ring interferometer were applied as gyroscopes...
Subjects/Keywords: Optical fiber detector
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Manager
APA (6th Edition):
Booysen, A. (2014). Sensor applications of a reflective fibre optic ring interferometer. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/9775
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Booysen, Andre. “Sensor applications of a reflective fibre optic ring interferometer.” 2014. Thesis, University of Johannesburg. Accessed April 16, 2021.
http://hdl.handle.net/10210/9775.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Booysen, Andre. “Sensor applications of a reflective fibre optic ring interferometer.” 2014. Web. 16 Apr 2021.
Vancouver:
Booysen A. Sensor applications of a reflective fibre optic ring interferometer. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10210/9775.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Booysen A. Sensor applications of a reflective fibre optic ring interferometer. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/9775
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
24.
Mekuanint, Lemlem.
INVESTIGATION OF THE EFFECTS OF MACRO BENDING LOSS ON STEP INDEX SINGLE MODE FIBER
.
Degree: 2013, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/1329
► The objective of the thesis are to calculate power loss due to bending, to determine the spectral window at which ber can e ectively operates,…
(more)
▼ The objective of the thesis are to calculate power loss due to bending, to determine
the spectral window at which ber can e ectively operates, to predict bend loss for a
higher wavelength from the trend of shorter wavelengths and investigates the variation
constants of optical ber (MAC) factor,with respect to using Laser stage lighting, He-Ne
laser and Diode laser, with wavelengths in the visible and infra red region of an optical
spectrum.
In this thesis, a single mode ber (SMF) was bent to various bend radius with a spe-
cially designed, adjustable ber bending device and out put power was measured using
a lock in ampli er. Thus, studying the relationship between macro bending and atten-
uation would enable us to maximize the performance of an optical ber. As a whole in
my experimental investigation was made of the bending losses in step index single mode
ber wave guide with di erent parameters of the equivalent step pro le for bending radii
from 0.5cm to 10.05cm with steps of 0.5cm, with the attenuation coe cient range is 0.045
dB/m to 0.475 dB/m,0.065 dB/m to 0.48 dB/m and 0.10 dB/m to 0.61 dB/m for the
wavelengths 532nm, 633nm and 808nm respectively
As signal wavelength passes the cut o wavelength, attenuation decreases sharply due
to disappearance of higher order mode. At wavelengths longer than cut o wavelength,
attenuation increases with wavelength increases. Furthermore, attenuation is inversely
proportional to bending radius measured at transmission wavelengths increases.
This study shows that attenuation introduced by macro bending depends on wave-
length and bending radius. Based on these ndings, one can minimize the adverse impact
of macro bending. As a whole the results from the experiment have suggested that the
optical power loss due to bending at the visible spectrum is more apparent than loss due
to other e ects such as absorption and scattering.
Advisors/Committee Members: Prof.A.V.Gholap (advisor).
Subjects/Keywords: BENDING LOSS;
FIBER
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APA (6th Edition):
Mekuanint, L. (2013). INVESTIGATION OF THE EFFECTS OF MACRO BENDING LOSS ON STEP INDEX SINGLE MODE FIBER
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/1329
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mekuanint, Lemlem. “INVESTIGATION OF THE EFFECTS OF MACRO BENDING LOSS ON STEP INDEX SINGLE MODE FIBER
.” 2013. Thesis, Addis Ababa University. Accessed April 16, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/1329.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mekuanint, Lemlem. “INVESTIGATION OF THE EFFECTS OF MACRO BENDING LOSS ON STEP INDEX SINGLE MODE FIBER
.” 2013. Web. 16 Apr 2021.
Vancouver:
Mekuanint L. INVESTIGATION OF THE EFFECTS OF MACRO BENDING LOSS ON STEP INDEX SINGLE MODE FIBER
. [Internet] [Thesis]. Addis Ababa University; 2013. [cited 2021 Apr 16].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/1329.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mekuanint L. INVESTIGATION OF THE EFFECTS OF MACRO BENDING LOSS ON STEP INDEX SINGLE MODE FIBER
. [Thesis]. Addis Ababa University; 2013. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1329
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Ottawa
25.
Song, Jia.
Optical Frequency Domain Reflectometry: Sensing Range Extension and Enhanced Temperature Sensitivity
.
Degree: 2014, University of Ottawa
URL: http://hdl.handle.net/10393/31532
► Optical fiber sensors have attracted tremendous attention over last two decades and have been successfully employed in various sensing applications, including temperature, strain, current, and…
(more)
▼ Optical fiber sensors have attracted tremendous attention over last two decades and have been successfully employed in various sensing applications, including temperature, strain, current, and so on. Among all types of optical fiber sensors, optical frequency domain reflectometry (OFDR) has been widely studied for its merits of simple configurations, high spatial resolution and high sensing accuracy. However, current limitation on OFDR lies in the sensing range and sensing accuracy. The state of art performance of commercial OFDR provides ~70m sensing range as well as 0.1K temperature accuracy. This is not adequate for large building distributed health monitoring due to the limited sensing range. Besides, high temperature response is also on demand for high precision measurement. To resolve the above limitation, in this thesis two major subjects have been studied regarding improving the performance and applicability of OFDR: One aims at extending the sensing range of OFDR while the other one focuses on enhancing temperature sensitivity of OFDR.
Firstly, we proposed novel data resampling approach regarding tuning nonlinearities of laser source to extend the sensing range. Commercial OFDR employs auxiliary interferometer (AI) to trigger data acquisition, where the maximum sensing range is limited to a quarter of the optical path difference (OPD) of AI according to Nyquist Sampling theorem. By employing the data resampling algorithm, the sensing range is no longer restricted by OPD and can even reach laser coherent length since OFDR is based on coherent detection scheme. Three data resampling algorithms are individually discussed and a sensing range of ~300m (~4 times the sensing range of commercial OFDR) with 8cm spatial resolution is for the first time achieved.
Secondly, the temperature response of OFDR is enhanced and we successfully achieved high temperature accuracy distributed sensing. One advantage of high temperature response is to enhance the spatial resolution since less spatial points are required in performing cross-correlation, while the other advantage is to obtain high temperature accuracy measurement at the same spatial resolution compared to that of traditional OFDR. This is especially important for maintaining spatial resolution under long range OFDR sensing since the total wavelength tuning range is smaller than traditional OFDR. Commonly the temperature response of single mode fiber is contributed by both thermal expansion coefficient and thermal optic coefficient of the waveguide and can be enhanced by increasing either of those coefficients. Thermal expansion coefficient is related with material property and is a weighted value of both bare fiber and coating. By using a large thermal expansion coefficient acrylic plank as a “coating” on SMF, we achieved ~9 times temperature response (~95 pm/ ˚C) compared with SMF (~10 pm/ ˚C). Further experiment is demonstrated with small diameter taper on an acrylic plank “coating”, in which case both thermal expansion coefficient and thermal optic coefficient…
Subjects/Keywords: Fiber;
Optics;
Sensing
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APA (6th Edition):
Song, J. (2014). Optical Frequency Domain Reflectometry: Sensing Range Extension and Enhanced Temperature Sensitivity
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/31532
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Song, Jia. “Optical Frequency Domain Reflectometry: Sensing Range Extension and Enhanced Temperature Sensitivity
.” 2014. Thesis, University of Ottawa. Accessed April 16, 2021.
http://hdl.handle.net/10393/31532.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Song, Jia. “Optical Frequency Domain Reflectometry: Sensing Range Extension and Enhanced Temperature Sensitivity
.” 2014. Web. 16 Apr 2021.
Vancouver:
Song J. Optical Frequency Domain Reflectometry: Sensing Range Extension and Enhanced Temperature Sensitivity
. [Internet] [Thesis]. University of Ottawa; 2014. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10393/31532.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Song J. Optical Frequency Domain Reflectometry: Sensing Range Extension and Enhanced Temperature Sensitivity
. [Thesis]. University of Ottawa; 2014. Available from: http://hdl.handle.net/10393/31532
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Baylor University
26.
Chester, Patrick, 1991-.
A Study of chemical treatments and processing for banana fiber-reinforced LDPE composites.
Degree: M.S.M.E., Baylor University. School of Engineering., 2016, Baylor University
URL: http://hdl.handle.net/2104/9826
► Natural fiber-reinforced polymeric composites have been gaining popularity due to their low weight and high sustainability potential. Banana pseudo-stem fibers in particular present a unique…
(more)
▼ Natural
fiber-reinforced polymeric composites have been gaining popularity due to their low weight and high sustainability potential. Banana pseudo-stem fibers in particular present a unique opportunity for reinforcement since they are widely grown and are currently considered an agricultural waste product. However, poor bonding between the hydrophilic
fiber and a comparatively hydrophobic thermoplastic matrix, such as LDPE, have limited composite properties. This study looks at two known natural
fiber treatments designed to promote interfacial bonding, peroxide and permanganate treatment, and documents their effect on banana pseudo-stem fibers and a banana
fiber/LDPE injection molded composite. It was found that peroxide treatment enhances the strength of individual fibers but is thermally unstable. Permanganate treatment decreases the moisture absorption of the fibers and improves interfacial bonding but provides no advantage over untreated fibers in composite properties. This study also looks into special processing considerations for injection molding natural
fiber composite parts.
Advisors/Committee Members: Jordan, William Mark, 1950- (advisor).
Subjects/Keywords: Banana fiber. LDPE
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APA (6th Edition):
Chester, Patrick, 1. (2016). A Study of chemical treatments and processing for banana fiber-reinforced LDPE composites. (Masters Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/9826
Chicago Manual of Style (16th Edition):
Chester, Patrick, 1991-. “A Study of chemical treatments and processing for banana fiber-reinforced LDPE composites.” 2016. Masters Thesis, Baylor University. Accessed April 16, 2021.
http://hdl.handle.net/2104/9826.
MLA Handbook (7th Edition):
Chester, Patrick, 1991-. “A Study of chemical treatments and processing for banana fiber-reinforced LDPE composites.” 2016. Web. 16 Apr 2021.
Vancouver:
Chester, Patrick 1. A Study of chemical treatments and processing for banana fiber-reinforced LDPE composites. [Internet] [Masters thesis]. Baylor University; 2016. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/2104/9826.
Council of Science Editors:
Chester, Patrick 1. A Study of chemical treatments and processing for banana fiber-reinforced LDPE composites. [Masters Thesis]. Baylor University; 2016. Available from: http://hdl.handle.net/2104/9826
Delft University of Technology
27.
Van Rij, F. (author).
Improving a Fiber Optic Interferometer for the SAFARI Instrument.
Degree: 2012, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:66319c10-7744-4b14-8e76-3012075e81d7
Not available because of confidentiality
Precision and Microsystems Engineering
Mechanical, Maritime and Materials Engineering
Advisors/Committee Members: Spronck, J.W. (mentor).Subjects/Keywords: fiber optic; interferometer
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Van Rij, F. (. (2012). Improving a Fiber Optic Interferometer for the SAFARI Instrument. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:66319c10-7744-4b14-8e76-3012075e81d7
Chicago Manual of Style (16th Edition):
Van Rij, F (author). “Improving a Fiber Optic Interferometer for the SAFARI Instrument.” 2012. Masters Thesis, Delft University of Technology. Accessed April 16, 2021.
http://resolver.tudelft.nl/uuid:66319c10-7744-4b14-8e76-3012075e81d7.
MLA Handbook (7th Edition):
Van Rij, F (author). “Improving a Fiber Optic Interferometer for the SAFARI Instrument.” 2012. Web. 16 Apr 2021.
Vancouver:
Van Rij F(. Improving a Fiber Optic Interferometer for the SAFARI Instrument. [Internet] [Masters thesis]. Delft University of Technology; 2012. [cited 2021 Apr 16].
Available from: http://resolver.tudelft.nl/uuid:66319c10-7744-4b14-8e76-3012075e81d7.
Council of Science Editors:
Van Rij F(. Improving a Fiber Optic Interferometer for the SAFARI Instrument. [Masters Thesis]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:66319c10-7744-4b14-8e76-3012075e81d7
Victoria University of Wellington
28.
Swan, Shaun.
Measurements of Magnetic Fiber Dynamics in Magnetic Fields using Optical and Electrical Techniques.
Degree: 2019, Victoria University of Wellington
URL: http://hdl.handle.net/10063/8600
► The fabrication of piezoelectric ceramics (Piezoceramics) currently relies on a costly dice and fill process to create an array of aligned pillars. These pillars act…
(more)
▼ The fabrication of piezoelectric ceramics (Piezoceramics) currently relies on a costly dice and fill process to create an array of aligned pillars. These pillars act as waveguides, improving the performance of the piezoceramic wafers over the bulk piezoceramic alone. It is theorised the creation of aligned pores in the piezoceramic may exhibit the same waveguiding effect, removing the need for the dice and fill process.
A technique for creating these pores is in development at Callaghan Innovation, New Zealand, where nickel coated carbon fibers are added to the ceramic slurry, aligned with a magnetic field, and attracted to the bottom of a mold. The number of fibers and degree of alignment dictate the waveguiding effectiveness and hence the performance of the piezoceramic. Additionally the time taken for fibers to form an array in the bottom of the mold dictate the piezoceramics fabrication time. Thus it is crucial to be able to measure the alignment and magnetically assisted sedimentation of these fibers in-situ. However the ceramic slurry is opaque, hence the optical methods traditionally can not be implemented.
This thesis describes the development and implementation of an electrical technique using the anisotropic conductance of fibers, for measuring
fiber dynamics during the fabrication of piezoceramics. The results of this electrical technique are compared to both optical monitoring results in a transparent solution, and models for the motion of rigid cylinders in a fluid suspension.
The change in conductance corresponding to
fiber rotation was found to have a time constant corresponding to
fiber rotation which is a scalar multiple of that of transmission microscopy and the mathematical modeling. This is a product of the geometry of the electrode configurations used to measure conductance. Furthermore, for
fiber rotation, the
fiber concentration in the solution changes the effective fluid viscosity due to hydrodynamic turbulence created by the rotating fibers.
The conductance change corresponding to the magnetically assisted
fiber settling is in good accordance with both the optical observations and mathematical modeling for 50 mPas solutions, however for 30 mPas solutions the modeling underestimates the settling time by 20%. The maximum
fiber concentration to create a single layer of aligned fibers in the bottom of the mold was found to be 12 fibers=mm³. Exceeding this limit results in a secondary and tertiary layer of fibers forming directly below the
fiber suspension injection location.
Advisors/Committee Members: Gouws, Gideon.
Subjects/Keywords: Magnetic; Fiber; Dynamics
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APA (6th Edition):
Swan, S. (2019). Measurements of Magnetic Fiber Dynamics in Magnetic Fields using Optical and Electrical Techniques. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8600
Chicago Manual of Style (16th Edition):
Swan, Shaun. “Measurements of Magnetic Fiber Dynamics in Magnetic Fields using Optical and Electrical Techniques.” 2019. Masters Thesis, Victoria University of Wellington. Accessed April 16, 2021.
http://hdl.handle.net/10063/8600.
MLA Handbook (7th Edition):
Swan, Shaun. “Measurements of Magnetic Fiber Dynamics in Magnetic Fields using Optical and Electrical Techniques.” 2019. Web. 16 Apr 2021.
Vancouver:
Swan S. Measurements of Magnetic Fiber Dynamics in Magnetic Fields using Optical and Electrical Techniques. [Internet] [Masters thesis]. Victoria University of Wellington; 2019. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10063/8600.
Council of Science Editors:
Swan S. Measurements of Magnetic Fiber Dynamics in Magnetic Fields using Optical and Electrical Techniques. [Masters Thesis]. Victoria University of Wellington; 2019. Available from: http://hdl.handle.net/10063/8600
Brandeis University
29.
Hayashi, Lauren.
Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays.
Degree: 2020, Brandeis University
URL: http://hdl.handle.net/10192/37514
► Carbon fibers are an ideal material for constructing multi-channel extracellular recording arrays. We have been working to construct 16-channel carbon fiber electrodes to record the…
(more)
▼ Carbon fibers are an ideal material for constructing multi-channel extracellular recording arrays. We have been working to construct 16-channel carbon fiber electrodes to record the activity of cells in the ferret LGN. An impedance below 4 MΩ was used as the standard for success. At the start of the process, very few channels met this goal. We implemented new methods for constructing and testing electrodes, and our success rate was brought up to an average of 83% (13 out of 16 channels in 19 electrodes). The new methods include an updated jig design, an improved silver-printing procedure, and the addition of a gold electroplating step to treat the recording tips of the carbon fibers. The electrodes constructed with the revised methods have been used to record from ferret V1 cortex, and have shown recorded spike amplitudes ranging from -150 to -300 V. These results confirm the capability of our carbon fiber electrodes to record neural activity. Our construction methods provide a solid foundation that equips the lab to make future adjustments to meet the goal of producing electrodes with a higher density of carbon fibers and with the necessary robustness to record in deeper brain regions like the LGN.
Subjects/Keywords: Carbon Fiber Electrodes
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APA (6th Edition):
Hayashi, L. (2020). Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays. (Thesis). Brandeis University. Retrieved from http://hdl.handle.net/10192/37514
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hayashi, Lauren. “Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays.” 2020. Thesis, Brandeis University. Accessed April 16, 2021.
http://hdl.handle.net/10192/37514.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hayashi, Lauren. “Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays.” 2020. Web. 16 Apr 2021.
Vancouver:
Hayashi L. Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays. [Internet] [Thesis]. Brandeis University; 2020. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/10192/37514.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hayashi L. Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays. [Thesis]. Brandeis University; 2020. Available from: http://hdl.handle.net/10192/37514
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
30.
Koecher, Katie.
Effects of a novel fiber blend on human gut function.
Degree: PhD, Food Science, 2013, University of Minnesota
URL: http://hdl.handle.net/11299/175531
► Enteral nutrition (EN) or enteral tube feeding is an effective means of nutritional support for individuals who do not or cannot eat adequately. Patients restricted…
(more)
▼ Enteral nutrition (EN) or enteral tube feeding is an effective means of nutritional support for individuals who do not or cannot eat adequately. Patients restricted to EN frequently suffer from abnormal bowel function which affects their intestinal bacteria and impacts quality of life. Dietary fibers have a variety of physiological benefits; fibers that provide fecal bulk promote regular bowel movements while fermentable fibers are utilized by gut bacteria to produce short chain fatty acids (SCFA) and gas in the process. SCFAs positively influence gut health, gut transit time, and fecal moisture while gas may reduce the tolerance of fibers. Fortification of EN with a blend of fibers with various physicochemical properties more closely represents a normal diet, and may maximize physiological benefits. Moreover, using a blend of fibers with different rates of fermentation may minimize gas and bloating commonly associated with highly fermentable fibers. Batch in vitro systems allow fiber fermentation modeling without absorption and may help to estimate potential health benefits and gastrointestinal tolerance of fiber in vivo. Well controlled, blinded and randomized intervention human studies are the "gold standard" for human nutrition research. The primary aim of this project was to conduct a human clinical trial utilizing a fiber blend fortified EN product. The secondary aim was to relate the human study findings to the in vitro fermentation profiles of the fiber blend and its individual components. The objective of the human study was to compare the effects of a fiber blend fortified enteral formula (FB, 15 g/L), a fiber-free formula (FF) and habitual diet on bowel function, fecal bacteria and quality of life. The fiber blend consisted of a 50:50 insoluble:soluble ratio of fructo-oligosaccharides (FOS), inulin, gum acacia and outer pea hull fiber. In a randomized, double-blind, crossover design, 20 healthy subjects consumed both FF and FB for 14 days with a 4 week washout. Fecal samples were collected the last 5 days of each period and assessed for fecal output, whole gut transit time (WGTT), and major bacterial groups. Subject gastrointestinal quality of life index (GIQLI) and tolerance were also measured. On formula diets, 5-day fecal output decreased by more than 55% from habitual diet, but was 38% higher on FB than FF (p=0.0321). WGTT was approximately 1.5 times longer on formula diets than habitual diet (p<0.0004). Total bacteria declined from habitual diet on FF (p<0.004), but not on FB. Numbers of bifidobacteria and lactobacilli declined from habitual diet on both formula diets, but bifidobacteria was higher on FB compared to FF (p<0.0001). Bacteroides and clostridia numbers did not change between diets. GIQLI and incidence of gas symptoms did not differ between formulas. The objectives of the second project were to compare the in vitro fermentation profiles of FOS, inulin, gum acacia, and pea fiber alone or blended using a 24 h batch model and relate these finding to the human study…
Subjects/Keywords: bacteria; fiber; gut
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APA ·
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APA (6th Edition):
Koecher, K. (2013). Effects of a novel fiber blend on human gut function. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/175531
Chicago Manual of Style (16th Edition):
Koecher, Katie. “Effects of a novel fiber blend on human gut function.” 2013. Doctoral Dissertation, University of Minnesota. Accessed April 16, 2021.
http://hdl.handle.net/11299/175531.
MLA Handbook (7th Edition):
Koecher, Katie. “Effects of a novel fiber blend on human gut function.” 2013. Web. 16 Apr 2021.
Vancouver:
Koecher K. Effects of a novel fiber blend on human gut function. [Internet] [Doctoral dissertation]. University of Minnesota; 2013. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/11299/175531.
Council of Science Editors:
Koecher K. Effects of a novel fiber blend on human gut function. [Doctoral Dissertation]. University of Minnesota; 2013. Available from: http://hdl.handle.net/11299/175531
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Open Access Theses and Dissertations
