Log in

Relevant bibliographies by topics / Polymeric masters / Dissertations / Theses

Dissertations / Theses on the topic 'Polymeric masters'

To see the other types of publications on this topic, follow the link: Polymeric masters.

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 36 dissertations / theses for your research on the topic 'Polymeric masters.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Bozkurt, Emrah Tanoğlu Metin. "Mechanical and thermal properties of non-crimp glass fiber reinforced composites with silicate nanoparticule modified epoxy matrix/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/makinamuh/T000517.pdf.

Full text

Abstract:

Thesis (Master)--İzmir Institute of Technology, İzmir, 2006
Keywords: polymer composites, Nanoparticles, glass fiber, mechanical properties, thermal properties. Includes bibliographical references (leaves 75-79).

APA, Harvard, Vancouver, ISO, and other styles

2

Metin, Dildare Tıhmınlıoğlu Funda. "Interfacial enhancement of polypropylene-zeolite composites/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000132.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Işık, Kıvanç Tanoğlu Metin. "Layered silicate/polypropylene nanocomposites/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/makinamuh/T000532.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Gemili, Seyhun Altınkaya Sacide Alsoy. "Preparation And Characterization of Antimicrobial Polymeric Films For Food Packaging Applications/." [s.l.]: [s.n.], 2007. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000651.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Dağtepe, Pınar Elmacı Nuran. "A computational study on the structure of allene polymers by using quantum chemical methods/." [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/kimya/T000348.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Ocak, Yılmaz Sofuoğlu Aysun. "Protection of the marble monument surfaces by using biodegradaple polymers/." [s.l.]: [s.n.], 2007. http://library.iyte.edu.tr/tezlerengelli/master/cevremuh/T000625.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Gültekin, Naz Tıhmınlıoğlu Funda. "Preparation And Characterization of Hydroxyopatite And Polymer Composite Biomaterials/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/biyoteknoloji/T000148.rar.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Karal, Kazım Tanoğlu Metin. "Tribological Behaviour of Polymer Nanocomposities Containing Tungsten Based Nanoparticles/." [s.l.]: [s.n.], 2007. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000664.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Seyhan, Abdullah Tuğrul Tanoğlu Metin. "Processing and characterization of polymer based composites with superior impact resistance/." [s.l.]: [s.n.], 2003. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000304.rar.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Topçuoğlu, Özge Alsoy Altınkaya Sacide. "Sorption and transport of water vapour in Acrylic Paints/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000498.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Eser, Hülya Tıhmınlıoğlu Funda. "Diffusion And Equilibrium Measurements In Polymer-Solvent Systems By Inverse Gas Chromatography Method/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimya/T000451.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Julian, Michael Robert. "Material characterization of viscoelastic polymeric molding compounds." Connect to resource, 1994. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1137616726.

Full text

Abstract:

Thesis (M.S.)--Ohio State University, 1994.
Advisors: Vernal H. Kenner and Carl H. Popelar, Dept. of Engineering Mechanics. Includes bibliographical references (leaf 106). Available online via OhioLINK's ETD Center

APA, Harvard, Vancouver, ISO, and other styles

13

Demir, Hasan Ülkü Semra. "Synergistic effect of natural zeolites on flame retardant additives/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000514.rar.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Özgarip, Yarkın Bayraktar Oğuz. "Application of Silk Fibroin In Controlled-Release of Theophylline/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000433.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Rahner, Nils. "Inorganic polymers (geopolymers) as potential bioactive materials : a thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Master of Science in Chemistry /." ResearchArchive@Victoria e-thesis, 2009. http://researcharchive.vuw.ac.nz/handle/10063/952.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Kalajian, Jill Michelle. "Towards a Single-Mode Dispensed Polymer Optical Waveguide." [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000211.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Abbas, Ibtisam. "Optimization of the optical properties of electrostrictive polyurethane for a smart lens thesis submitted in partial fulfilment of the degree of Master of Engineering, Auckland University of Technology, February 2005." Full thesis. Abstract, 2005. http://puka2.aut.ac.nz/ait/theses/AbbasI.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Nilsson, Markus, and Tom Carlén. "Quality Assessment of Thin Polymer Components using NonDestructive Testing : Degree Project for Master of Science in Mechanical Engineering with emphasis on Applied Mechanics." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18365.

Full text

Abstract:

Polymer components are used in many different applications, including in industries where critical applications put high requirements regarding quality assessment. Such applications might include medical or food where the presence of discontinuities might induce bacterial growth or other unpleasantries, thus certain manufacturers must be able to maintain a zero-tolerance towards damaged components. This leads to the need for efficient testing methods of nondestructive nature capable of testing large quantities of components in a production line environment. The authors have been tasked by Acoustic Agree AB and Trelleborg AB, a world-leading producer of polymer engineered solutions, to find a nondestructive testing method capable of detecting discontinuities in thin polymer components in a production line environment. Implementation in production line environments puts requirements on test cycle time and a goal is to complete a test cycle within 3-4 seconds. Due to restrictions regarding available equipment and expertise, the focus has been put on applying nonlinear acoustic methods for nondestructive testing instead of more conventional methods. These methods utilize the nonlinear distortion of acoustic waves which causes certain characteristics to appear, such as the generation of Higher Harmonics (HH), frequency modulation (NWMS), resonance frequency shift (NRUS), and amplitude recovery (IDAR). Visual testing was used to discern visibly damaged samples from seemingly undamaged ones. The only methods which showed the possibility of discerning damaged thin polymer components were NRUS and IDAR. Only the latter has the capability to maintain the prescribed test cycle time. Nonlinear acoustic methods seem to be capable of detecting discontinuities in thin polymer components within the given time frame. More work is required to properly investigate the performance of NWMS and IDAR. The configuration used in this work was mainly focused on IDAR, resulting in specific calibration for NWMS was neglected. The sample population was also too low to collect sufficient data to ensure statistical certainty regarding the performance for either method.
Polymerkomponenter används i många olika tillämpningar, i synnerhet i industrier där kritiska tillämpningar ställer höga krav på kvalitetsbedömning. Sådana tillämpningar kan finnas inom medicinska- eller livsmedelsindustrier där förekomsten av diskontinuiteter kan inducera bakterietillväxt eller andra obehagliga egenskaper, därför måste vissa tillverkare upprätta nolltolerans mot skadade komponenter. Detta leder till behovet av effektiva provningsmetoder av oförstörande natur som kan utvärdera stora mängder komponenter i en produktionslinjemiljö. Författarna har fått uppdrag av Acoustic Agree AB och Trelleborg AB, en världsledande producent av polymertekniska lösningar, för att finna en oförstörande provningsmetod som kan detektera diskontinuiteter i tunna polymerkomponenter i en produktionslinjemiljö. Implementering i produktionslinjemiljöer ställer krav på testcykeltid och ett mål är att kunna slutföra en testcykel inom 3-4 sekunder. Begränsningen av tillgänglig utrustning och expertis har lett till att författarna har fokuserat på att tillämpa olinjära akustiska metoder för oförstörande provning istället för mer konventionella metoder. Dessa metoder utnyttjar olinjär distortion av akustiska vågor vilket medför att vissa egenskaper uppträder, såsom generering av övertoner (HH), frekvensmodulering (NWMS), resonansfrekvensskift (NRUS) och amplitudåtergång (IDAR). Visuell provning användes för att skildra synligt skadade prover från till synes oskadade. De enda metoder som visade möjligheten att urskilja skadade tunna polymerkomponenter var NRUS och IDAR. Endast den sistnämnda har förmågan att utföra provning inom den föreskrivna provcykeltiden. Olinjära akustiska metoder verkar kunna detektera diskontinuiteter i tunna polymerkomponenter inom den givna tidsramen. Mer arbete krävs för att korrekt utvärdera prestandan av NWMS och IDAR. Konfigurationen som användes i detta arbete var huvudsakligen inriktad på IDAR, vilket resulterade i att specifik kalibrering för NWMS ej utförts. Provpopulationen var även för låg för att kunna samla in tillräckligt med data för att uppnå statistisk säkerhet angående metodernas prestanda.

APA, Harvard, Vancouver, ISO, and other styles

19

O'Connor, Sean James. "Synthesis and thermal treatment of lithium- and magnesium-containing geopolymers : a thesis submitted to the Victoria University of Wellington in partial fulfilment of the requirements for the degree of Master of Science in Chemistry /." ResearchArchive@Victoria e-thesis, 2009. http://hdl.handle.net/10063/1236.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Манас, Кызы А., and Kyzy A. Manas. "Термодинамика взаимодействия полиакриламида с полиакриловой и полиметакриловой кислотами : магистерская диссертация." Master's thesis, б. и, 2020. http://hdl.handle.net/10995/94638.

Full text

Abstract:

С помощью объемного варианта сорбционного метода изучена сорбция воды пленками ПАА, ПАК, ПМАК и смесями ПАА-ПАК, ПАА-ПМАК разного состава. Измерены теплоты смешения образцов с водой с использованием микрокалориметра типа Тиана-Кальве. Рассчитаны разности химических потенциалов воды ∆µ1, полимеров и смесей ∆µ2, энергии Гиббса смешения полимеров с водой ∆gm. Определены энергии Гиббса, энтальпии и энтропии смешения компонентов в полимерных композициях. Показано, что сорбционная способность систем ПАА-ПАК, ПАА-ПМАК определяется их структурой и сродством к воде. ПАК ведет себя как плотноупакованный полимер, имеющий высокое сродство к воде, а сорбция воды ПМАК свидетельствует о менее плотной упаковке цепей и меньшему сродству к воде. Сорбция воды смесями немонотонно изменяется с составом композиции. Установлено, что смешение всех систем с водой сопровождается уменьшением энергий Гиббса (Δgm < 0), величина ∂2g/∂ω22 > 0, что указывает на образование термодинамически устойчивых систем. Чем б льше сорбционная способность полимера или смеси, тем более отрицательны величины Δgm. Обнаружено, что растворение в воде всех изученных систем сопровождается экзотермическим тепловым эффектом. Отклонения энтальпий смесей от аддитивности положительны для всех систем кроме смеси ПАА-ПМАК с ωПАА < 0,2, что свидетельствует о хорошем взаимодействии полимеров друг с другом. Установлено, что энергии Гиббса смешения ПАА с ПАК и ПМАК полученные двумя методами: с помощью расчета по энергиям Гиббса растворения систем и с помощью уравнения Флори-Хаггинса, хорошо коррелируют друг с другом. Показано, что что смешение ПАА с ПАК сопровождается экзотермическим тепловым эффектом во всей области составов и уменьшением энергии Гиббса вплоть до содержания 90% ПАА. При этом ∆gx и ∆hx близки по величине, и энтропийный вклад в совместимость компонентов T∆sx очень невелик. Таким образом, термодинамическая совместимость ПАА с ПАК обусловлена, главным образом, энергетическим взаимодействием компонентов. Обнаружено, что смеси ПАА-ПМАК образуются с отрицательной энергией Гиббса смешения (∆gx<0) и знакопеременной энтальпией смешения: при содержании ПАА менее 20% ∆hx > 0,а при содержании более 20% – ∆hx<0. Энтропия смешения положительна во всей области составов.
Using the volumetric version of the sorption method, water sorption was studied with PAM, PAA, PMAA films and PAM-PAA, PAM-PMAA mixtures of various compositions. The heats of mixing samples with water were measured using a Tiana-Calve type microcalorimeter. The differences between the chemical potentials of water ∆µ1, polymers and mixtures ∆µ2, Gibbs energy of mixing polymers with water ∆gm are calculated. The Gibbs energies, enthalpy, and entropy of mixing of the components in polymer compositions are determined. It was shown that the sorption ability of PAM-PAA, PAM-PMAK systems is determined by their structure and affinity for water. PAA behaves as a close-packed polymer with a high affinity for water, and the sorption of PMAA water indicates a less dense packing of chains and a lower affinity for water. Sorption of water mixtures non-monotonously changes with the composition. It was found that the mixing of all systems with water is accompanied by a decrease in Gibbs energies (Δgm <0), the value ∂2g/∂ω22> 0, which indicates the formation of thermodynamically stable systems. The greater the sorption capacity of the polymer or mixture, the more negative the Δgm values. It was found that dissolution of all the studied systems in water is accompanied by an exothermic thermal effect. Deviations of the enthalpies of the mixtures from additivity are positive for all systems except the PAM-PMAA mixture with ωPAM <0.2, which indicates a good interaction of the polymers with each other. It was established that the Gibbs energies of mixing PAM with PAA and PMAA were obtained by two methods: using the Gibbs energies of dissolution of systems and using the Flory-Huggins equation, they correlate well with each other. It was shown that the mixing of PAM with PAA is accompanied by an exothermic thermal effect in the entire composition range and a decrease in Gibbs energy up to the content of 90% PAM. Moreover, ∆gx and ∆hx are close in magnitude, and the entropy contribution to the compatibility of the components of T∆sx is very small. Thus, the thermodynamic compatibility of PAM with PAA is mainly due to the energy interaction of the components. It was found that PAM-PMAA mixtures are formed with a negative Gibbs mixing energy (∆gx <0) and an alternating mixing enthalpy: with a PAM content of less than 20%, ∆hx> 0, and with a content of more than 20%, ∆hx <0. The entropy of mixing is positive throughout the composition field.

APA, Harvard, Vancouver, ISO, and other styles

21

Meles, Aaron Robert. "Development of a Predictive Model for Bulk-Flow Through A Porous Polymer Membrane Tube." UNF Digital Commons, 2012. http://digitalcommons.unf.edu/etd/406.

Full text

Abstract:

While extensive mathematical and numerical work has been done in terms of modeling the mainstream flow in a tube with porous walls, very little has been done experimentally to confirm these various solutions, and what has been done has focused on large sintered metal tubes used in nuclear power applications. Furthermore, these solutions are quite mathematically complex and arduous to implement. In this work, the mainstream flow through a porous polymer membrane tube is examined and a method for calculating the through-membrane flow rate and axial pressure drop is presented. Two membrane tubes are tested experimentally, and a simple set of modeling equations that are physically intuitive are presented which fit the data. A characterization test is described which can be used to determine the permeability coefficient, kD, for a membrane sample, which can in turn be used to calculate the through-membrane flow rate and axial pressure drop. The models are then evaluated by performing flow-through experiments and measuring the pressures and flows within the membrane. For both membranes tested, the permeability coefficient is determined to be kD = 5.9394 × 10−14 m2 . For the tube diameters (2 mm and 8 mm) and flow rates (100-500 sccm) tested, it is shown that for dimensionless tube lengths bL = L/(dReD) ≥ 0.3, a model that assumes fully developed flow through the entire tube accurately describes the through-membrane flow rate data. The fully-developed model consistently under-predicts the experimental data for axial pressure drop, therefore it is assumed that the discrepancy is due to an additional pressure loss from the developing region. This loss is determined empirically using the data. The model’s validity is examined and compared to that of other authors for the range of flow rates tested.

APA, Harvard, Vancouver, ISO, and other styles

22

Marashdeh, Wajeeh. "Relaxation Behavior and Electrical Properties of Polyimide/Graphene Nanocomposite." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1595850361812632.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Graeff, Matthew Kent. "The Repair of Laterally Damaged Concrete Bridge Girders Using Carbon Fiber Reinforcing Polymers (CFRP)." UNF Digital Commons, 2012. http://digitalcommons.unf.edu/etd/592.

Full text

Abstract:

In recent years the use of carbon fiber reinforcing polymers (CFRP) to repair damaged structural components has become more accepted and practiced. However, the current reference for designing FRP systems to repair and strengthen reinforced concrete (RC) and prestressed concrete (PSC) girders has limitations. Similarly, very few resources address solutions for the debonding problem associated with CFRP laminates or the use of CFRP laminates to repair structural members with pre-existing damage. The included experimental program consists of testing both RC and PSC girders with simulated lateral damage and CFRP repairs. A total of 34 RC beams were statically tested under a 4-point loading until failure and had cross-section dimensions of 5” x 10” (14cm x 25.4cm), were 8’ long (2.44m), and were reinforced with either #3 or #4 mild steel rebar. 13 PSC girders having cross-section dimensions representing a half-scaled AASHTO type II shape, were 20’ long (6.1m), and were prestressed with five 7/16” (11.1mm) diameter low-lax 7-wire strands. Ten of the PSC girders were statically loaded until failure under a 4-point testing setup, but 3 PSC girders were dynamically tested under fatigue loading using a 3-point arrangement. Different configurations of CFRP laminates, number and spacing of CFRP transverse U-wraps, and amount of longitudinal CFRP layers are studied. The results present the flexural behavior of all specimen including load-deflection characteristics, strain characteristics, and modes of failure. Ultimately, results are used to recommend important considerations, needed criteria, and proper design procedures for a safe and optimized CFRP repair configuration.

APA, Harvard, Vancouver, ISO, and other styles

24

Faceto, Angelo Danilo. "Simulação da dinâmica do estado excitado em semicondutores orgânicos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-16072012-135847/.

Full text

Abstract:

Neste trabalho, o método de Monte Carlo e a resolução da Equação Mestra foram utilizados para simular o processo de difusão espectral da excitação em um sistema polimérico emissor de luz. A metodologia utilizada incorpora a relaxação energética intramolecular, a migração de energia incoerente entre segmentos conjugados e o processo final radiativo (luminescência). O principal objetivo é comparar os resultados da simulação e de experimentos envolvendo medidas de absorção, de excitação óptica e de luminescência realizadas no IFSC ao longo dos últimos anos ou provenientes da literatura especializada. Além disso, a simulação pretende elucidar a natureza dos processos fotofísicos em semicondutores orgânicos e testar a validade de teorias analíticas existentes, o que é essencial para a aplicação dessa classe de materiais como dispositivos no futuro. Especial atenção é dada na análise do comportamento temporal da difusão espectral em sistemas homogêneos em que o acoplamento dipolar na transferência de energia é realizado entre uma matriz de segmentos conjugados distribuídas aleatoriamente. A temperatura foi incorporada ao modelo. A comparação dos resultados da simulação com os resultados experimentais permitiu comprovar a validade do modelo proposto, do programa utilizado e entender melhor características de parâmetros não conhecidos em polímeros conjugados, como a influência da forma da distribuição energética dos estados eletrônicos e a distribuição e da temperatura no processo de migração do éxciton. Foi possível reproduzir com sucesso os espectros de luminescência e de absorção em polímeros conjugados descritos na literatura. Além disso, a simulação permitiu explicar resultados relacionados a sistemas poliméricos homogêneos anisotrópicos como polímeros estirados por uma tensão mecânica e materiais não homogêneos híbridos contendo polímero conjugado emissor de luz e nanopartículas. A maior contribuição foi o entendimento do efeito da temperatura nas propriedades de emissão como deslocamento espectral e alargamento homogêneo. Efeitos anômalos, como o deslocamento da emissão com a temperatura e o alcance da difusão com o tempo, foram explicados em termos da termalização do estado excitado e frustração da migração. Por fim, foi possível estudar os processos fotofísicos envolvidos em heteroestruturas orgânicas contendo gradiente energético que permitem o controle da migração direcional do éxciton e suas propriedades de emissão a partir dos processos de transferência de energia tipo Förster (dipolo-dipolo). O controle sobre os processos fotofísicos do polímero luminescente foi realizado através da alteração tanto da orientação como do tamanho de conjugação do material de polimérico.
In the present work, the Monte Carlo method and the direct numerical integration of the Master Equation were employed to simulate the excitation spectral diffusion process in light emitting polymeric systems. The methodology employed a competition among the internal intra-molecular relaxation, the inter-molecular incoherent energy transfer via Förster mechanism and the final process that may be a radiative emission or a non radiative relaxation through a suppression center. This works main objective is to compare the simulation results with the experiments of absorption, optical excitation and luminescence carried out in our group, throughout the last years or from the specialized literature. Moreover, the simulation intends to elucidate the nature of the photophysical processes in organic semiconductors and to test the validity of existing theories, what is essential for the application of this class of materials to devices in the future. Special attention is given to the analysis of the time dependence and the effect of temperature in homogenous systems, where the energy transfer and spectral diffusion were carried out through a matrix of randomly distributed conjugated segments coupled by dipole interaction. The comparison of the simulation results with the experimental ones allowed to prove the validity of the model, the computational program and to better understand characteristic of parameters for conjugated polymers which are still studied. Different energy distributions of electronic states, molecular position and orientation are used in order to simulate molecular configurations obtained by various sample preparation methodologies. With the simulation, it was possible to reproduce with success the experimental luminescence and absorption spectra in polymers conjugated described in literature. Besides, the simulation allowed to explain the exciton migration and properties related to temperature, such as the red shift and broadening of the spectral lines of conjugated polymer emission. The non exponential characteristics of the emissions time resolved intensity curves have been reproduced. The simulation was used to understand effects of temperature on the spectral diffusion as well. Anomalies related to spectral shift emission spectra with temperature and the mean diffusion length with time were explained with the thermalization and frustration of the migration at sufficiently low temperatures and at long relaxation times. Finally, it was possible to study the photophysical processes present in organic heterostructures having energy gradient, as well as the control of the properties of emission via changing the Förster type energy transfer processes between emitting polymers. The control over the photophysical process of the luminescent polymer was accomplished by changing both orientation and mean conjugation length of the polymer material.

APA, Harvard, Vancouver, ISO, and other styles

25

Alteri, Nicholas James. "Flexural Behavior of Laterally Damaged Full-Scale Bridge Girders Through the Use of Carbon Fiber Reinforced Polymers (CFRP)." UNF Digital Commons, 2012. http://digitalcommons.unf.edu/etd/412.

Full text

Abstract:

ABSTRACT The repair and strengthening of concrete bridge members with CFRP has become increasingly popular over recent years. However, significant research is still needed in order to develop more robust guidelines and specifications. The research project aims to assist with improving design prosedures for damaged concrete members with the use of CFRP. This document summarizes the analysis and testing of full-scale 40’ foot long prestressed concrete (PSC) bridge girders exposed to simulated impact damage and repaired with carbon fiber reinforced polymers (CFRP) materials. A total of five AASHTO type II bridge girders fabricated in the 1960’s were taken from an existing bridge, and tested at the Florida Department of Transportation FDOT structures lab in Tallahassee, Florida. The test specimens were tested under static loading to failure under 4-point bending. Different CFRP configurations were applied to each of the girders. Each of the test girders performed very well as each of them held a higher capacity than the control girder. The repaired girders 5, 6 and 7 surpassed the control girder’s capacity by 10.88%, 15.9% and 11.39%. These results indicate that repairing laterally damaged prestressed concrete bridge girders with CFRP is an effective way to restore the girders flexural capacity.

APA, Harvard, Vancouver, ISO, and other styles

26

Maxwell, Taylor Patrick. "Passive Gas-Liquid Separation Using Hydrophobic Porous Polymer Membranes: A Study on the Effect of Operating Pressure on Membrane Area Requirement." UNF Digital Commons, 2012. http://digitalcommons.unf.edu/etd/351.

Full text

Abstract:

The use of hydrophobic porous polymer membranes to vent unwanted gas bubbles from liquid streams is becoming increasingly more common in portable applications such as direct methanol fuel cells (DMFCs) and micro-fluidic cooling of electronic circuits. In order for these portable systems to keep up with the ever increasing demand of the mobile user, it is essential that auxiliary components, like gas-liquid separators (GLS), continue to decrease in weight and size. While there has been significant progress made in the field of membrane-based gas-liquid separation, the ability to miniaturize such devices has not been thoroughly addressed in the available literature. Thus, it was the purpose of this work to shed light on the scope of GLS miniaturization by examining how the amount porous membrane required to completely separate gas bubbles from a liquid stream varies with operating pressure. Two membrane characterization experiments were also employed to determine the permeability, k, and liquid entry pressure (LEP) of the membrane, which provided satisfying results. These parameters were then implemented into a mathematical model for predicting the theoretical membrane area required for a specified two-phase flow, and the results were compared to experimental values. It was shown that the drastically different surface properties of the wetted materials within the GLS device, namely polytetrafluoroethylene (PTFE) and acrylic, caused the actual membrane area requirement to be higher than the theoretical predictions by a constant amount. By analyzing the individual effects of gas and liquid flow, it was also shown that the membrane area requirement increased significantly when the liquid velocity exceeded an amount necessary to cause the flow regime to transition from wedging/slug flow to wavy/semi-annular flow.

APA, Harvard, Vancouver, ISO, and other styles

27

Do, Tuyet-Trinh. "Thermal degradation of polyvinyl chloride blends / by Tuyet-Trinh Do." Thesis, Queensland University of Technology, 2000.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

28

Kelton, William. "A scalable method for the production of pH responsive polyamide microcapsules for drug delivery : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering in Chemical and Process Engineering, University of Canterbury /." 2008. http://hdl.handle.net/10092/1988.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Vella, P. C., S. S. Dimov, E. Brousseau, and Benjamin R. Whiteside. "A new process chain for producing bulk metallic glass replication masters with micro- and nano-scale features." 2014. http://hdl.handle.net/10454/9237.

Full text

Abstract:

Yes
A novel process chain for serial production of polymer-based devices incorporating both micro- and nano-scale features is proposed. The process chain is enabled by the use of Zr-based bulk metallic glasses (BMG) to achieve the necessary level of compatibility and complementarity between its component technologies. It integrates two different technologies, namely laser ablation and focused ion beam (FIB) milling for micro-structuring and sub-micron patterning, respectively, thus to fabricate inserts incorporating different length scale functional features. Two alternative laser sources, namely nano-second (NS) and pico-second (PS) lasers, were considered as potential candidates for the first step in this master-making process chain. The capabilities of the component technologies together with some issues associated with their integration were studied. To validate the replication performance of the produced masters, a Zr-based BMG insert was used to produce a small batch of micro-fluidic devices by micro-injection moulding. Furthermore, an experimental study was also carried out to determine whether it would be possible by NS laser ablation to structure the Zr-based BMG workpieces with a high surface integrity whilst retaining the BMG's non-crystalline morphology. Collectively, it was demonstrated that the proposed process chain could be a viable fabrication route for mass production of polymer devices incorporating different length scale features.

APA, Harvard, Vancouver, ISO, and other styles

30

Stanger, J. J. "Charge transfer mechanisms in electrospinning : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Science in Physics at the University of Canterbury /." 2008. http://hdl.handle.net/10092/1667.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Сулдина, Ж. И., and Z. I. Suldina. "Изучение вязкоупругих свойств растворов ацетата целлюлозы с нанодисперсным неорганическим наполнителем : магистерская диссертация." Master's thesis, 2018. http://hdl.handle.net/10995/66081.

Full text

Abstract:

The traditional method of modifying the properties of polymeric materials is their filling with mineral particles. The use of synthetic nano-sized fillers in comparison with coarse-dispersed natural ones is very promising due to the large specific surface of nanomaterials. The study of such compositions by rheometric methods makes it possible to assess the structural changes that occur when nanoparticles are introduced into the polymer solution. In this study, studies were carried out in the mode of harmonic oscillations with solutions of cellulose acetate DAC in DMSO in the concentration range of 5-20% by weight. polymer containing 3 and 5% of the mass. amorphous silica. The experiments were carried out on a Haake MARS rotary rheoscope with a working cone-plane unit in the voltage range of 0.1-100 Pa and frequencies of 0.1-100 Hz at temperatures of 298, 318 and 338 K. Measurements of the frequency dependences of the complex viscosity, elastic modulus and loss modulus were performed at a constant voltage of 10 Pa. It was found that the DAC solutions in DMSO are non-Newtonian fluids that exhibit elastic properties with a DAC content of more than 10% by weight. It is shown that the concentration of AC, at which the solution begins to show elastic properties, decreases with increasing concentration of aerosil. For the DAC-DMSO-Aerosil system, there is a temperature-concentration range in which the elastic modulus is greater than the loss modulus, that is, the introduction of aerosil leads to a significant change in the system behavior during deformation. According to the data obtained, the concentration dependences of the enthalpies of activation of the flow of DAC solutions in DMSO and DAC-DMSO-aerosil systems were calculated.
Традиционным методом модификации свойств полимерных материалов является их наполнение минеральными частицами. Применение синтетических наноразмерных наполнителей по сравнению с грубодисперсными природными является очень перспективным из-за большой удельной поверхности наноматериалов. Исследование таких композиций реометрическими методами дает возможность оценить структурные изменения, происходящие при введении наночастиц в раствор полимера. В данной работе исследования проводили в режиме гармонических колебаний с растворами ацетата целлюлозы ДАЦ в ДМСО в диапазоне концентраций 5-20% масс. полимера, содержащих 3 и 5 % масс. аморфного диоксида кремния. Опыты проводили на ротационном реоскопе Haake MARS с рабочим узлом типа конус-плоскость в диапазоне напряжений 0,1 -100 Па и частот 0.1-100 Гц при температурах 298, 318 и 338 К. Измерения частотных зависимостей комплексной вязкости, модуля упругости и модуля потерь проводили при постоянном напряжении 10 Па. Обнаружено, что растворы ДАЦ в ДМСО являются неньютоновскими жидкостями, проявляющими упругие свойства при содержании ДАЦ более 10%масс. Показано, что величина концентрации АЦ, при которой раствор начинает проявлять упругие свойства, уменьшается с увеличением концентрации аэросила. Для системы ДАЦ-ДМСО-аэросил существует температурно- концентрационный диапазон, в котором модуль упругости больше модуля потерь, то есть введение аэросила приводит к существенному изменению поведения системы при деформировании. По полученным данным рассчитаны концентрационные зависимости величин энтальпий активации течения растворов ДАЦ в ДМСО и систем ДАЦ-ДМСО-аэросил.

APA, Harvard, Vancouver, ISO, and other styles

32

Мизёв, А. С., and A. S. Mizyov. "Фазовые переходы систем желатин – вода и агароза – вода в магнитном поле и вне поля : магистерская диссертация." Master's thesis, 2018. http://hdl.handle.net/10995/66162.

Full text

Abstract:

Phase transitions of the gelatin – water and agaroza - water systems have been studied using the cloud-point method. Phase diagrams of these systems are constructed at different values of pH of medium. It is shown that pH of medium influences on the melting temperature of gelatin and agaroza gels.
Методом точек помутнения изучены фазовые переходы в системах желатин – вода и агароза – вода. Построены фазовые диаграммы систем при разных pH среды в магнитном поле и вне поля. Установлено, что pH среды влияет на температуру плавления гелей желатина и агарозы.

APA, Harvard, Vancouver, ISO, and other styles

33

Жернов, И. В., and I. V. Zhernov. "Влияние магнитного поля на фазовые переходы и структуру растворов и расплавов гибкоцепных полимеров : магистерская диссертация." Master's thesis, 2016. http://hdl.handle.net/10995/48630.

Full text

Abstract:

Методами точек помутнения, поляризационной микроскопии и рентгеноструктурного анализа изучены фазовые переходы систем ПЭ – о-ксилол, ПЭ – н-гексан, ПЭ – хлороформ, ПЭ – о-дихлорбензол, ПЭГ – 1,4-диоксан и ПЭГ – толуол, а также структура выделенных их них полимерных образований в магнитном поле и в его отсутствие. Построены фазовые диаграммы систем. Установлено, что магнитное поле приводит к повышению температур кристаллизации растворов и расплавов ПЭ и ПЭГ. Обнаружено, что в растворах ПЭГ в магнитном поле образуются сферолиты существенно меньших размеров, чем в отсутствие магнитного поля. Определены степени кристалличности образцов ПЭ и ПЭГ, выделенных из растворов и расплавов. Показано, что магнитное поле увеличивает степень кристалличности ПЭГ, но не влияет на степень кристалличности ПЭ.
Phase transitions of the PE – xylol, PE – hexane, PE – chloroform, PE – dichlorobenzene, PEG – 1,4-dioxane and PEG – toluene systems, and also the structure of the polymers separated from these systems have been studied using the cloud-point method, polarizing microscopy and the X-ray diffraction under magnetic field and in its absence. Phase diagrams of these systems are constructed. It is shown that the magnetic field leads to the increase in polymer crystallization temperatures from solutions and melts. It is revealed that the sizes of spherulites formed in PEG solutions under magnetic field are significantly smaller, than that in the magnetic field absence. The crystallinity degree of the PE and PEG samples separated from solutions and melts was determined. It was shown that the magnetic field increases the crystallinity degree of PEG, but doesn't influence on the PE crystallinity degree.

APA, Harvard, Vancouver, ISO, and other styles

34

Baker, Suher. "The effect of adhesive polymer layers on the durability of the enamel-resin interface under flexural stress a thesis submitted in partial fulfillment ... for the degree of Master of Science in Pediatric Dentistry ... /." 2003. http://catalog.hathitrust.org/api/volumes/oclc/68962483.html.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Ковеза, Е. В., and E. V. Koveza. "Термодинамика взаимодействия полиоксомолибдатов с водорастворимыми неионогенными полимерами : магистерская диссертация." Master's thesis, 2019. http://hdl.handle.net/10995/78955.

Full text

Abstract:

The static equilibrium isothermal sorption of dioxane, ethyl acetate, and methanol vapors by POM polyoxometalates with the structure of buckyball (Mo132, Mo72Fe30) and torus (Mo138), and also polymer-salt compositions containing POM were studied. The changes in the chemical potentials of the components and the Gibbs energy of the interaction of POMs, polymers, and compositions with low molecular weight liquids are calculated. The Gibbs energies and entropies of interaction of the components of the POM – polymer systems are estimated. The stability of the POM structure before and after sorption was investigated by IR spectroscopy. It was established that all investigated POMs exhibit the highest sorption capacity for dioxane, the lowest for ethyl acetate. Mo132 exhibits maximum affinity for sorbates, Mo72Fe30 exhibits a minimum affinity, and Mo138 occupies an intermediate position. It was established that PVP and PVA adsorb methanol in significantly larger quantities compared with compositions containing POM. The same rule is observed for PVP-POM systems in the case of dioxane. PVA practically does not absorb dioxane, but the introduction of POM in films of polyvinyl alcohol leads to the appearance of the sorption ability of the film. For all compositions a decrease in the Gibbs energy of the interaction of components and an increase in entropy were found, which can be associated with loosening and partial destruction of the crystal structure of the POM when polymer chains are introduced into it. The structure of polyoxomolybdates was found to be stable in dioxane vapors, and is also preserved in polymer-salt compositions before and after sorption.
Изучена статическая равновесная изотермическая сорбция паров диоксана, этилацетата и метанола полиоксометаллатами ПОМ со структурой букибола (Mo132, Mo72Fe30) и тора (Mo138), а также полимерно-солевыми композициями, содержащими ПОМ. Рассчитаны изменения химических потенциалов компонентов и энергии Гиббса взаимодействия ПОМов, полимеров, композиций с низкомолекулярными жидкостями. Оценены энергии Гиббса и энтропии взаимодействия компонентов систем ПОМ – полимер. Методами ИК- спектроскопии исследована стабильность структуры ПОМ до и после сорбции. Установлено, что наибольшую сорбционную способность все исследованные ПОМ проявляют к диоксану, наименьшую – к этилацетату. Максимальное сродство к сорбатам проявляет Mo132, минимальное – Mo72Fe30, Mo138 занимает промежуточное положение. Установлено, что ПВП и ПВС сорбируют метанол в существенно больших количествах по сравнению с композициями, содержащие ПОМ. Такая же закономерность наблюдается для систем ПВП – ПОМ в случае диоксана. ПВС практически не поглощает диоксан, но введение ПОМ в пленки поливинилового спирта приводит к возникновению сорбционной способности пленки. Для всех композиций ПОМ -полимер обнаружено уменьшение энергии Гиббса взаимодействия компонентов и возрастание энтропии, которое может быть связно с разрыхлением и частичным разрушением кристаллической структуры ПОМ при внедрении в нее полимерных цепей. Обнаружено, что структура полиоксомолибдатов стабильна в парах диоксана, а также сохраняется в полимерно-солевых композициях до и после сорбции.

APA, Harvard, Vancouver, ISO, and other styles

36

Ворухайлов, И. С., and I. S. Vorukhailov. "Технология производства кузова вездехода, предназначенного для эксплуатации в условиях Крайнего Севера : магистерская диссертация." Master's thesis, 2018. http://hdl.handle.net/10995/60286.

Full text

Abstract:

В данной магистерской диссертации произведен обзор и анализ наземных транспортных средств, в частности колесных вездеходов на шинах сверхнизкого давления, получивших наиболее широкое распространение на территориях Крайнего Севера. Выявлены характерные особенности и условия эксплуатации автомобильного транспорта в арктической части РФ. На основании полученной информации разработана концепция вездехода на шинах сверхнизкого давления, наиболее адаптированного для использования в северных широтах. Исходя из предложенной конструкции, составлен технологический процесс изготовления и последующей сборки кузова данной колесной машины. Определены необходимые конструкционные материалы, используемые при производстве кузова вездехода.
In this master's dissertation, a survey and analysis of land vehicles, in particular wheeled all-terrain vehicles on ultra-low pressure tires, which have been most widely used in the Far North. The characteristic features and conditions of operation of motor transport in the Arctic part of the Russian Federation are revealed. Based on the information received, was developed the concept of an all-terrain vehicle on ultra-low pressure tires, most adapted for use in the northern latitudes. Proceeding from the proposed design, was compiled the technological process of manufacturing and subsequent assembly of the body of this wheeled vehicle. The necessary structural materials used in the manufacture of the body of an all-terrain vehicle are determined.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!