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Dissertations / Theses on the topic 'Pearling'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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1

com, dbearham@hotmail, and Douglas Bearham. "Identification and characterisation of two haplosporidian parasites of oysters in north Western Australia." Murdoch University, 2008. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20081114.120135.

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A cryptic haplosporidian parasite was detected infecting rock oysters from the Montebello Islands in north-western Australia using a PCR targeting the parasites small ribosomal subunit gene. The PCR products were cloned and sequenced along with the remaining sections of the parasites SSU rRNA gene. Phylogenetic analysis of the sequence generated indicated a Minchinia species (Haplosporidia). The SSU sequence generated was used to develop two in situ hybridisation assays to visualise the parasite in H/E sections as well as a PCR assay to detect the parasite. The molecular assays were asses

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2

Mayo, Lisa Cheree. "Mathematical modelling of the impaction and spreading of spray droplets on leaves." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/91389/1/Lisa%20Cheree_Mayo_Thesis.pdf.

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This thesis concerns the development of mathematical models to describe the interactions that occur between spray droplets and leaves. Models are presented that not only provide a contribution to mathematical knowledge in the field of fluid dynamics, but are also of utility within the agrichemical industry. The thesis is presented in two parts. First, thin film models are implemented with efficient numerical schemes in order to simulate droplets on virtual leaf surfaces. Then the interception event is considered, whereby energy balance techniques are employed to instantaneously predict whet

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3

Tian, Falin. "Interaction between Nanoparticles and Aggregates of Amphiphile Molecules." Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL1002.

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Ayant une structure particulière avec une tête hydrophile et une queue hydrophobe, des molécules amphiphile ont de nombreuses applications importantes, comme par exemple, la fabrication des détergents, la protection et la fonctionnalisation de surfaces, etc. Des agrégats de diverses formes, micelles, véhicules, membranes etc., peuvent se former à partir des amphiphiles. La complexité de ces agrégats moléculaires rend l’étude théorique de ce type de systèmes extrêmement difficile. Jusqu’à présent, notre connaissance sur l’interaction entre des nanoparticules et des agrégats des amphiphiles rest

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4

Keiser, Armelle. "Dynamiques sur des surfaces texturées et imprégnées." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS601.

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En s’appuyant sur des expériences canoniques revisitées, cette thèse caractérise la dynamique de gouttes, de bulles, et de films minces sur des surfaces biomimétiques texturées et imprégnées d’huile. En contact avec des liquides aqueux, ces surfaces présentent quatre phases distinctes (les textures solides, l’huile, le liquide déposé et l’air) donnant naissance à une multitude d’interfaces dont le rôle est prédominant dans les dynamiques observées. La friction visqueuse s’opposant au dévalement d’une goutte est caractérisée en fonction du rapport des viscosités de la goutte et de l’huile. Les

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5

Pandit, Ashwin Suresh. "Theory of the pearlite transformation in steels." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609797.

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6

Riehm, Derek J. "Kinetics of the pearlite to austenite reversion transformation." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29739.

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The pearlite-to-austenite reversion transformation kinetics under isothermal and continuous heating conditions in a eutectoid plain-carbon steel have been measured, using a dilatometric technique on a Gleeble 1500 Thermomechanical Simulator. The isothermal data was characterized in terms of the transformation start time at temperature for the onset of the P→ γ transformation, and in terms of the Avrami parameters n and b. Under the assumption that the P→ γ transformation was additive, the Scheil equation was applied to the measured isothermal transformation start data to predict the onset of

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7

Das, Bakshi Subhankar. "Wear of fine pearlite, nanostructured bainite and martensite." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/262770.

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Abrasion is a form of wear prominent particularly in the agricultural, mining, mineral and transportation industries. The cost of abrasive wear to the national economy is estimated to be about 1% of the gross national product, and it can compromise the safety and reliability of engineering components. The mechanism of wear is complex and dependent on all the materials involved in the process, environmental conditions and many subtle factors such as the shape of the abrading particles. Many abrasion-resistant steels are based on a quenched and tempered martensitic microstructure, because the ha

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8

Mojtaba, Mansouri Arani. "Static strain aging in low carbon ferrite-pearlite steel : forward and reverse loading." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55894.

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The combination of static strain aging and plastic strain reversal is important to understand for both the forming of components and also analysis of in service performance, for example, in the case of fabrication of pipeline, motor shafts or structural components in buildings and ships. Static strain aging phenomenon has been experimentally studied for the cases of forward and reverse re-straining after aging on a low carbon steel (0.16 wt% C) with a ferrite-pearlite microstructure. Torsion tests on hollow tubular samples were used for the mechanical tests. The shear strain on the surface of

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9

Erkami, Ali Akbar. "The studies of high strain deformation in carbon steels containing differing amounts of pearlite." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303427.

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10

John, Pearlie Marie. "A qualitative assessment of the insulation systems of medium voltage induction motors / Pearlie Marie John." Thesis, North-West University, 2007. http://hdl.handle.net/10394/1358.

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The aim of this study is to qualitatively assess the insulation system's condition of medium voltage induction motors. In essence this aim of the research was to analyse and classify the data. The initial step was to understand the data. The literature review gives the background of the insulation system and the different tests done and its interpretations. The research methodology used has been explained along with description of the data. The aging of the insulation is a wide and complex topic, thus in this research the electrical aspects of the insulation were looked into and explained in d

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11

Garnham, John Ernest. "The wear of bainitic and pearlitic steels." Thesis, University of Leicester, 1995. http://hdl.handle.net/2381/9148.

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The rolling-sliding dry-wear behaviour of a series of bainitic steels and a standard pearlitic rail steel have been compared over a range of contact stress and creepage conditions applicable to the British Rail network. A rolling-sliding wear machine has been constructed - LEROS - which allows very high contact stresses to be combined with high creepages under well controlled conditions. Materials were tested on LEROS and on an Amsler machine. Limited vibration analyses were carried out on both machines and compared with the frequencies of disc surface periodic undulations. No direct linkage w

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12

Kinap, Paulo Eduardo Barros. "Tratamentos térmicos para obtenção de cementita esferoidizada em ferro fundido nodular." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-11072017-145654/.

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O objetivo do presente trabalho, consistiu na obtenção de ferro fundidos nodulares, a serem utilizados na fabricação de eixos, com as seguintes características mecânicas após os tratamentos térmicos adequados: limites de resistência à tração e escoamento mínimos de 700 N/mm2 e 450 N/mm2 respectivamente, alongamento mínimo de 5% e dureza entre 235 à 285 HB. A microestrutura mais adequada à obtenção das características mecânicas desejadas deveria consistir de cementita esferoidizada numa matriz ferrítica, a ser obtida com o tratamento de recozimento ou revenimento de microestruturas previamente

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13

Gießmann, Adam Andreas [Verfasser], Ingo [Akademischer Betreuer] Steinbach, and Werner [Akademischer Betreuer] Theisen. "The influence of stress enhanced diffusion on the growth of pearlite in eutectoid plain carbon steel / Adam Andreas Gießmann. Gutachter: Ingo Steinbach ; Werner Theisen." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1082425877/34.

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14

Dyčka, Martin. "Optimalizace technologie perlitizace masivních vývalků." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319561.

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This thesis deals with heat treatment of pearlitic steel beams with using of induction heating. The aim of this heat treatment is to improve mechanical properties of steel beams. In theoretical part are described pearlitic steels and theory of induction heating. In experimental part of this thesis analysis of current state of technology with its results was made. Numerical model describing current state of technology was assembled. Then this model was used to recommend adjustments in current technology of heat treatment, which leads to enlargement of heat treated depth. Experiments with adjust

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15

Liu, Ning. "Microstructure and mechanical properties of cold drawn steel wires." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2012. https://ro.ecu.edu.au/theses/512.

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Cold drawn eutectoid steel wires have been widely used for a variety of applications, such as suspension bridges, steel cords for automobile tires, and springs. Much research has been done to increase their mechanical strength. With advances in modern production technology, both the drawing speed and the quality of drawn steels have been enhanced. After a careful literature survey, it is obvious that some issues are still controversial. As Y.S. Yang, J.G. Bae and C.G. Park mentioned, the lamellar spacing, thickness and volume fraction of cementites have all reached the nanometer regime, and th

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16

Moreno, Marc. "Mécanismes métallurgiques et leurs interactions au recuit d’aciers ferrito-perlitiques laminés : caractérisation et modélisation." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0068.

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Les aciers Dual Phase (DP) ferrito-martensitiques sont largement utilisés sous la forme de tôles minces dans la construction automobile en raison de leur excellent compromis résistance/ductilité et donc pour leur potentiel d’allègement. Ils sont élaborés par coulée continue, laminage à chaud et à froid suivis d’un recuit continu. Durant l’étape de chauffage et de maintien de ce recuit, la microstructure ferrito-perlitique déformée issue des étapes de laminage se transforme en microstructure ferrito-austénitique recristallisée. L’expérience montre que les cinétiques de recristallisation et de t

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17

Agudelo, Juan Ignacio Pereira. "Analysis of the microstructure transformation (wel formation) in pearlitic steel used in relevant engineering wear systems." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-04092018-131559/.

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In this thesis, the behavior of pearlitic steel was characterized under controlled wear conditions in the laboratory and service conditions in two ore mining stages, comminution and transportation. The thesis consists in three experimental chapters, divided according to the tribosystems analyzed. On all the chapters Electro Microscopy techniques for the microstructural analysis were employed. Scanning Electron Microscopy (SEM), Focused Ion Beam (FIB-SEM), Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM) were used. The first experimental chapter shows the anal

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18

Chaves, Ana Paula Gonçalves. "Rodas ferroviárias: análise, microestrutura e propostas de melhoria." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-02032017-144335/.

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A pesquisa relativa ao transporte ferroviário no Brasil tem se intensificado nos últimos anos visando principalmente a melhoria no desempenho do par rodatrilho. Isso se deve à demanda de se transportar cada vez mais carga por eixo com a finalidade de reduzir o custo de transporte. Através de mudanças na microestrutura do material ou de mudanças na composição das ligas utilizadas na fabricação pode se aumentar a resistência do par roda-trilho. Neste trabalho foi analisada a influência de diferentes microestruturas (puramente perlíticas e perlíticas-bainíticas), obtidas por meio de tratamento té

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19

Green, Colin S. "Case studies of effective assimilation programs in selected churches." Theological Research Exchange Network (TREN), 2008. http://www.tren.com/search.cfm?p001-1241.

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20

Caruso, Matteo. "Thermomechanical processing of eutectoid steels: strategies to improve the microstructure of the hot rolled strips." Doctoral thesis, Universite Libre de Bruxelles, 2013. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209371.

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Eutectoid steel strips are designed for the production of parts for intensive use such as clutches, seat slides, and springs as they exhibit<p>excellent strength levels and wear resistance. These properties arise from the unique morphology of lamellar pearlite which can be considered<p>as a self-laminated nanoscale composite. However, a spheroidization annealing step is nowadays necessary to improve the cold forming properties before further cold rolling steps.<p>This thesis is aimed at improving the tensile ductility of the hot rolled products of eutectoid composition in order to eliminate th

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21

Pan, L. (Longxiu). "Two methods for processing an ultrafine ferritic grain size in steels and the thermal stability of the structure." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:951427489X.

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Abstract In this thesis, methods to process ultrafine ferritic (UFF) structures in steels, i.e. grain sizes below about 3 μm have been investigated. It is shown here, in accordance with the results in the literature, that a steel with a UFF grain size can be obtained by two methods, more or less convenient to mass production: deformation-induced ferrite transformation from fine-grained austenite (the DIF route) and the static recrystallization of various heavily cold-worked initial microstructures (the SRF/SRM route). In the present work, the influencing factors in the processing of UFF stru

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22

Fager, Fredrick, and Serg Chanouian. "Nuclear Waste Canister : Evaluating the mechanical properties of cassette steel after casting." Thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209803.

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Företaget Svensk Kärnbränslehantering AB (SKB) håller på att utveckla en slutförvaringskapsel som kommer innehålla avfall från den svenska kärnkraften. Det är dock fortfarande en process under utveckling och därför undersöks olika typer av metoder och kapselmaterial för att kunna tillverka en hållbar och säker kapsel. Kapseln består av ett hölje av kopparrör med svetsad botten och lock och en insats med stållock. Insatsen är en cylindrisk konstruktion av segjärn och innehåller en svetsad stålkassett för att skapa utrymmen till det använda kärnbränslet. Insatsen innehåller bland annat stålrör

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23

Mäkinen, Katri. "Optimisation of local material parameters : Optimising local material parameters in ductile cast iron cylinder head casting." Thesis, Jönköping University, JTH, Material och tillverkning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54500.

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The constantly tightening emission regulations demand the engines to be moreefficient, to get more power out of smaller engines. Higher engine loads andcomponent temperatures are causing more stresses to engine components. Therefore,a company that produces engines wanted to study if it would be possible to increasethe capabilities of the components by optimising the used material. In this final project work, a cylinder head will be studied. The cylinder heads for theengines are made of ductile cast iron. The limits of that material are near safety limits,and therefore a better material is need

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24

Kuprin, Corinna. "Verformungsverfestigung bei zyklisch inkrementeller Torsion von Reineisen und dem Stahl 42CrMo4N." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-103890.

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Die Arbeit widmet sich dem Fließverhalten von Stählen bei zyklisch inkrementeller Torsion. Dazu werden vergleichend Reineisen und der ferritisch-perlitische Stahl 42CrMo4N bei unterschiedlichen Verformungspfaden betrachtet. Vor allem in zyklischen Torsionsversuchen mit bleibendem Verformungsinkrement je Zyklus werden Fließkurvenverläufe und Verformungsverfestigung analysiert. Die Ergebnisse belegen den Einfluss des lamellaren Zementit auf das Fließverhalten des Stahls 42CrMo4N, während die Eigenschaften des Reineisens von der entstehenden Versetzungszellstruktur bestimmt werden. Die Richtungsa

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25

Suyitno, Budhi-Muliawan. "Etude du comportement en fatigue d'aciers à dispersoïdes." Poitiers, 1988. http://www.theses.fr/1988POIT2342.

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Etude experimentale sur un acier micro-allie dans deux etats microstructuraux bainitique et ferrito-perlitique, soumis a des essais d'endurance, de fatigue oligocyclique et de fissuration. Comparaison avec les resultats obtenus sur un acier conventionnel dans un etat trempe-revenu. Influence de l'environnement (air, vide, azote et traces de vapeur d'eau) et de la frequence d'essai. Discussion du role fragilisant de la vapeur d'eau. Proposition d'un modele de propagation sous environnement actif

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26

Xiong, Xiao Chuan. "Élaboration et genèse des microstructures dans les "aciers" fer-azote." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL079N/document.

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L’industrie automobile cherche constamment à augmenter la part des pièces fabriquées à partir de tôles minces en aciers plus résistants et à plus bas coût. Le parallèle entre les diagrammes de phases Fe-N et Fe-C montre qu’il est possible de développer des aciers similaires dans le système Fe-N. Les objectifs de cette étude étaient l’élaboration des aciers binaires Fe-N et le développement des structures équivalentes à celles dans les aciers au carbone. Les approches envisagées s’articulent autour de : Elaboration : la nitruration gazeuse en phase austénitique suivie de traitements d’homogénéi

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27

Pappas, Adlreburg Nickolas. "To Make Iron of Iron : A Comprehensive Analytical Study of Spade Shaped Iron Bars." Thesis, Stockholms universitet, Arkeologiska forskningslaboratoriet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145694.

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This thesis aims to provide adequate analytical information on the spade shaped iron bars of Norrland and central Sweden. While their significance has been thoroughly debated for decades, analytical research on them has been confined to cases of single artefacts or theoretical interpretations of their value, meaning and origin. In this study a comprehensive approach is taken into consideration. Based on X-Ray fluorescence (XRF), scanning electron microscopy (SEM) and metallographical analysis this thesis seeks to facilitate new interpretations on quality, production centres and usage based on

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28

Humiski, Lisa. "Effects of pearling level and genotype on physical grain characteristics, composition, and technological and sensory properties of selected western Canadian barley varieties." 2011. http://hdl.handle.net/1993/4500.

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Limited information exists regarding the effects of light pearling on the properties of physical grain characteristics, composition, and technological and sensory properties of selected varieties of Western Canadian barley especially hulless barley genotypes with modified starch characteristics. Nine barley genotypes with different hull (hulled and hulless) and starch characteristics (normal, waxy, and high amylose (HA)) were pearled to three differing levels. Scanning electron micrographs showed that the pericarp, testa, aleurone, and subaleurone layers were completely removed in heavily pear

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29

Caines, Megan. "The experiences of two caregiver populations : an application of Pearlin's stress process framework." Thesis, 2008. http://hdl.handle.net/1828/2581.

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This study examines the experiences of dementia caregivers (DCs) and caregivers of older adults with non-dementia related mental illness (CMIs) through the application of Pearlin's stress process framework, which conceptualizes the caregiving experience as an interplay between various contextual factors, stressors, moderating resources, and outcomes variables. A total of seven caregivers (4 DCs, 3 CMIs) participated in this study. Participation involved a one-on-one semi-structured interview focused on tapping into the components of Pearlin's framework, following which participants completed t

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Pham, Tri T. "Mathematical modelling of the onset of transformation from austenite to pearlite under non-continuous cooling conditions." Thesis, 1993. http://hdl.handle.net/2429/2384.

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The temperature at which a new phase forms is an important parameter in the genesis of final microstructure. For diffusional transformation processes, prediction of this temperature on cooling, until now, relied upon empirical equations which are based on the cooling rate or degree of undercooling. To develop a method that is capable of predicting the onset of transformation in the steel, applicable to industrial processing conditions, a theoretical study has been conducted to critically examine the consequences and implications of the Scheil additivity rule in relation to the incubation of th

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31

Song, Yuan-Shung, та 宋元聖. "The study of a eutectoid reaction for the formation of κ-pearlite in a Mn-Al steel". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/dwp3xy.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>99<br>We have studied the phase transformations of a Mn-Al steel during low temperature aging processes. The heat treatment of the steel was solution treated at 1100℃ and followed by heating isothermally at temperatures from 850 to 500℃. The composition of the steel is Fe-14.5 Mn-6.4 Al-0.78 C (wt%). The constituent phases of the Mn-Al steel is single austenite at temperatures between 1100 and 825℃. At temperatures below 800℃, ferrite and ??carbide precipitate at the grain boundaries of the austenite matrix. Furthermore, at aging temperatures below 675℃, we found lam

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32

John, Pearlie Marie. "A qualitative assessment of the insulation systems of medium voltage induction motors / by Pearlie M. John." Thesis, 2007. http://hdl.handle.net/10394/1358.

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Lin, Chia-Chi, and 林家吉. "Effect of Pearlite Stabilization on Tensile Embrittlement and Thermal Shocking Failure of S.G. Cast Iron at Elevated Temperatures." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/04475442957392103674.

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碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>96<br>This study is intended to evaluate how feasible it is to suppress the intergranular embrittlement fracture behavior of spheroidal graphite (SG) cast iron with the formation of pearlite in the cast iron. Intermediate-temperature embrittlement and cyclic heating induced embrittlement are investigated in this study. In the latter case, the primary objective is to examine the effect of cyclic heating at the maximum temperature and the resultant microstructural change due to the instability of pearlite at high temperatures. Two types of SG cast iron have been

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34

Garrison, Christy C. "“Still Here”; The Enduring Legacies Of Dorothy Bolden, Ella Mae Wade Brayboy, And Pearlie Dove’s Community Leadership In Atlanta, 1964-2015." 2017. http://scholarworks.gsu.edu/history_diss/61.

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ABSTRACT This dissertation examines the enduring leadership of community activists Dorothy Bolden, Ella Mae Wade Brayboy, and Pearlie Dove from 1964 until 2015. Brayboy was one of the first African-American Deputy Voter Registrars in the state of Georgia, Bolden founded the National Domestic Workers Union and Dove was the first woman to head the department of education at Clark College. This dissertation inserts Dorothy Bolden, Ella Mae Wade Brayboy, and Pearlie Dove into the classic Civil Rights Movement narrative by framing their community advocacy as equal to the efforts of Atlanta’s more w

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Kuprin, Corinna. "Verformungsverfestigung bei zyklisch inkrementeller Torsion von Reineisen und dem Stahl 42CrMo4N." Doctoral thesis, 2012. https://monarch.qucosa.de/id/qucosa%3A19830.

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Die Arbeit widmet sich dem Fließverhalten von Stählen bei zyklisch inkrementeller Torsion. Dazu werden vergleichend Reineisen und der ferritisch-perlitische Stahl 42CrMo4N bei unterschiedlichen Verformungspfaden betrachtet. Vor allem in zyklischen Torsionsversuchen mit bleibendem Verformungsinkrement je Zyklus werden Fließkurvenverläufe und Verformungsverfestigung analysiert. Die Ergebnisse belegen den Einfluss des lamellaren Zementit auf das Fließverhalten des Stahls 42CrMo4N, während die Eigenschaften des Reineisens von der entstehenden Versetzungszellstruktur bestimmt werden. Die Richtungs

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