Relevant bibliographies by topics / Pearling

Academic literature on the topic 'Pearling'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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Journal articles on the topic "Pearling"

Rafik, Sifeddine, Mohamed Rahmani, Juan Pablo Rodriguez, Said Andam, Amine Ezzariai, Mohamed El Gharous, Salwa Karboune, Redouane Choukr-Allah, and Abdelaziz Hirich. "How Does Mechanical Pearling Affect Quinoa Nutrients and Saponin Contents?" Plants 10, no. 6 (June 3, 2021): 1133. http://dx.doi.org/10.3390/plants10061133.

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Agriculture is facing many challenges, such as climate change, drought, and salinity, which call for urgent interventions for fast adaptation and crop diversification. The introduction of high-value and stress tolerant crops such as quinoa would be a judicious solution to overcome constraints related to abiotic stress and to increase land productivity and farmers’ incomes. The implementation of quinoa in Morocco has not been supported by a full valorization program to control the quality of quinoa seeds. The novelty of this work is to assess the pearling operation as an efficient method of saponins removal as well as the determination of total residual saponins. This study aimed to evaluate the effects of several pearling durations on nutrient and saponin content of quinoa seeds of three tested varieties (Puno, Titicaca, and ICBA-Q5). Five pearling durations were tested (0, 2, 4, 6, 7, and 8 min) using a locally manufactured pearling machine. The results indicated that a pearling duration of two minutes was enough to reduce total saponin content from 0.49% to 0.09% for Puno variety, from 0.37% to 0.07% for Titicaca variety, and from 0.57% to 0.1% for ICBA-Q5 variety. Our results showed that pearling slightly reduced protein, total fat, and moisture contents for all varieties except for Puno, where total fat content slightly increased with the pearling. Puno variety had the highest seed content in terms of protein and total fat; the ICBA-Q5 variety had the lowest. Titicaca had the highest bran content in terms of protein and total fat, ICBA-Q5 had the highest bran content in terms of ash and the lowest bran content in terms of protein and total fat, and Puno had the lowest bran content in terms of ash. Pearling had no significant effect on macronutrient contents in the processed seed, but it resulted in a very highly significant difference for most of them in the bran except for Mg and S. Regarding seed content in terms of micro-nutrients, statistical analysis showed significant differences between varieties in terms of Zn, Cu, and Mn contents, but no significant difference was recorded for Fe or B. Pearling had no significant effect on seed micronutrient contents. Therefore, to retain maximum nutritional content in the quinoa and maintain quinoa integrity, it is necessary to limit the pearling duration of quinoa to two minutes, which is enough to reduce saponin content below the Codex Standard threshold (0.12%).

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Sots, S., I. Kustov, and Y. Kuzmenko. "SOME FEATURES OF BARLEY AND OATS PROCESSING." Grain Products and Mixed Fodder’s 19, no. 3 (November 14, 2019): 34–40. http://dx.doi.org/10.15673/gpmf.v19i3.1510.

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It is proved the high effectiveness of using naked oats varieties Salomon and Samuel and hull-less barley variety Achilles as raw material for production new groats products with high biological value. Researched modes of pearling, water heat treatment and its impact on yield of pearled and flaked groats. The technological scheme of processing hull less barley and naked oats for producing groats, flakes, mixtures of groats and flakes were developed. Technology includes grain cleaning stage, grain water heat treatment, pearling, sorting of pearling products, pearled groat water heat treatment, mixing, flaking, drying, and control of end products. Studied hull-less barley characterized by high protein content 14,615,8 % and β-glucans – 6,8-7,4 %, has same to conventional dehulled grain mass fraction of lipids 2,1-3,8 % and starch – 57,6-60,5 %, low ash content 2,3-2,7%. Naked oats grain traditionally characterized by high mass fraction of lipids – 6,0-6,3 %,high mass fraction of protein - 14,9-15,4% and βglucans - 6,4-6,9% close to conventional dehulled grain mass fraction of starch – 59,3-61,6 % and ash – 2,1-2,3 %. It was found that the technologically expedient moisture content of hull-less barley and naked oats before pearling is 12-13 %. In the pearling the grain with this humidity depending on the duration of pearling yield of groat estimated to range between 6796 %. Increasing moisture content of grain before pearling to 14.0% does not significantly change the limits of yield values, and pearling grain with low moisture content of 10.5% leads to excessive grinding and formation of a significant amount of by-products and waste in the form of fine particles and husking bran.Technologically expedient moisture content of naked oats pearled groat before steaming stage are 15 % and the vapor pressure in steamer of 0.10 MPa. For the pearled barley groat most appropriate moisture content of before steaming is 20 % and the vapor pressure in steamer of 0.10 MPa.Steaming in this mode allows to obtain flaked groats with yield at 84 to 93%

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Chaïeb, Sahraoui, and Sergio Rica. "Spontaneous curvature-induced pearling instability." Physical Review E 58, no. 6 (December 1, 1998): 7733–37. http://dx.doi.org/10.1103/physreve.58.7733.

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Sots, S., I. Kustov, Y. Kuzmenko, and O. Vereshchynskyi. "FEATURES OF PROCESSING OATS INTO GROATS PRODUCTS." Grain Products and Mixed Fodder’s 19, no. 4 (February 3, 2020): 30–36. http://dx.doi.org/10.15673/gpmf.v19i4.1587.

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In the given article the existing technologies of hulled oats grain processing into groats products were analyzed. The possibilities of using new breeding varieties of oats to improve existing technologies were analyzed. Advantages using naked oat varieties for the production of groats and flakes were considered. Results of research influence intensity of pearling and water heat treatment on yield of pearled groats and its quality indicators were shown. The high efficiency of use naked oats for the production of pearled groats with regulated quality indicators was determined. It was found that the technologically expedient moisture content of naked oats before pearling is 12-12.5 %. In the pearling the grain with this humidity depending on the duration of pearling yield of groat estimated to range between 78 94 %. Use as raw materials naked oats increase yield of pearled groats at 1.4-1.6 times in compared to processing of conventional varieties. Modes of preparation of pearled groats for flaking was investigated, feature their influence on the yield and qualities of flaked groats were determined. Analyses of the physical properties of the obtained flaked products were conducted. It was found that the technologically expedient moisture content of pearled naked oats groats before steaming is 17-17.5 %. After steaming groats with this moisture yield of flaked groat estimated to range between 84,3 93,6 %. The main stages of processing naked oats into groats products were determined. The technological scheme of processing naked oats for producing groats and flakes were developed. The technological scheme of processing hull-less barley and naked oats for producing groats, flakes, mixtures of groats and flakes were developed. Technology includes grain cleaning stage, grain water heat treatment, pearling, sorting of pearling products, pearled groat water heat treatment, mixing, flaking, drying, and control of end products.

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Sławińska, Martyna, Michał Sobjanek, Joanna Dawicka, Joanna Kłudkowska, and Roman Nowicki. "Penile changes due to genital pearling (fang muk)." Dermatology Review 1 (2017): 64–65. http://dx.doi.org/10.5114/dr.2017.66224.

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Vella, Marco, Alberto Abrate, Stefania Zerbo, Antonietta Lanzarone, Carlo Pavone, and Alchiede Simonato. "Spontaneous extrusion of male genital pearling." Urology Case Reports 38 (September 2021): 101728. http://dx.doi.org/10.1016/j.eucr.2021.101728.

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Morse, Robyn. "Pearling and the Language of Freedom." Journal of Global Slavery 7, no. 3 (October 6, 2022): 317–46. http://dx.doi.org/10.1163/2405836x-00703003.

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Abstract As international anti-slavery pressure on the British increased in the early twentieth century, officials in the Persian Gulf began to manumit a growing number of enslaved persons. Enslaved pearl divers needed to physically approach the British in order to start their manumission application. In this process, their memories and history would be typically condensed into a one-page document. I argue that not just imperial archival methods influenced these statements, but the memory of British imperial experience with slavery influenced the ways in which they approached, understood, and targeted slavery in the Indian Ocean and the Persian Gulf. The manufactured English-language applications in the archive corresponded with British conceptions of slavery, but the interpretations of slavery placed on Persian Gulf communities didn’t conform to local understandings of the institution. I demonstrate the process of translation, in which local realities of enslavement were transformed into British understandings of freedom.

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Boedec, G., M. Jaeger, and M. Leonetti. "Pearling instability of a cylindrical vesicle." Journal of Fluid Mechanics 743 (March 4, 2014): 262–79. http://dx.doi.org/10.1017/jfm.2014.34.

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AbstractA cylindrical vesicle under tension can undergo a pearling instability, characterized by the growth of a sinusoidal perturbation which evolves towards a collection of quasi-spherical bulbs connected by thin tethers, like pearls on a necklace. This is reminiscent of the well-known Rayleigh–Plateau instability, where surface tension drives the amplification of sinusoidal perturbations of a cylinder of fluid. We calculate the growth rate of perturbations for a cylindrical vesicle under tension, considering the effect of both inner and outer fluids, with different viscosities. We show that this situation differs strongly from the classical Rayleigh–Plateau case in the sense that, first, the tension must be above a critical value for the instability to develop and, second, even in the strong tension limit, the surface preservation constraint imposed by the presence of the membrane leads to a different asymptotic behaviour. The results differ from previous studies on pearling due to the consideration of variations of tension, which are shown to enhance the pearling instability growth rate, and lower the wavenumber of the fastest growing mode.

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Naseeb, Haifa Tawfeeq, Jongoh Lee, and Heejae Choi. "Elevating Cultural Preservation Projects into Urban Regeneration: A Case Study of Bahrain’s Pearling Trail." Sustainability 13, no. 12 (June 10, 2021): 6629. http://dx.doi.org/10.3390/su13126629.

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The island of Muharraq in the Kingdom of Bahrain was previously in a state of socioeconomic disrepair and neglect, until the nine years-long “Pearling Trail” project revived the area. Historically, Muharraq’s importance inheres in it being the main trade center of the Middle East since the Mesopotamian period, especially as the source of the finest pearls in the world. However, the discovery of oil that led to the rapid urbanization of the region and Japan perfecting the production of cultured pearls had meant that Muharraq dwindled out of cultural significance. Due to the residents’ dissatisfaction and nostalgia for the island’s past glory, along with the government’s new policies towards cultural preservation, the “Pearling Trail” Project commenced in 2012. The Ministry of Culture of Bahrain repaired, renovated and preserved an area of 3.5 km, transforming it into an eco-museum with a thriving business and cultural community. The transformation of the island elevated the city into a trendy local attraction, hosting local and global cultural festivals and events, owing to the “Pearling Trail’s” Urban Regeneration Project’s success. By studying the “Pearling Trail” three success factors are identified: Project expansion beyond UNESCO preservation requirements, focus on sustainability and continuous use, and improved access to culture and cultural opportunities. Identifying these factors could allow for future preservation projects in Bahrain or elsewhere to be upgraded for urban regeneration or revitalization.

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Yu, Yan, and Steve Granick. "Pearling of Lipid Vesicles Induced by Nanoparticles." Journal of the American Chemical Society 131, no. 40 (October 14, 2009): 14158–59. http://dx.doi.org/10.1021/ja905900h.

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Dissertations / Theses on the topic "Pearling"

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 assessed for specificity and sensitivity and were then used to compare the parasite to previous haplosporidian parasite infections of pearl oysters. Both assays produced positive results from the infected pearl oysters but not from other closely related haplosporidian species. An SEM and TEM electron microscopy analysis was performed on spores from both parasite species. The spores of the pearl oyster parasite had two spore wall filaments wound around the spore originating for a posterior thickening while the spores of the rock oyster parasite were covered in microtubule-like structures. These data suggests pearl oysters where co-infected with both the Haplosporidium sp. and the Minchinia sp. detected in rock oysters. No evidence of a posterior thickening could be found on the spores of the rock oyster parasite. Attempts to detect the parasite at the previous geographic sites of its detection in pearl oysters resulted in detection of the Minchinia species in tropical oysters in the Kimberley region of Western Australia by in-situ hybridisation.

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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 whether an impacting droplet will bounce, splash, or adhere to a leaf.

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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 reste encore incomplète. A l’aide de certaines méthodes de simulations moléculaire et une approche théorique, nous avons entrepris une série d’études pour mieux comprendre les questions fondamentales suivantes :1. Comment la présence de nanoparticules, notamment la courbure de ses surfaces, affecte l’agrégation de molécules amphiphile ?2. Comment une bicouche de lipide, une forme d’agrégat particulier des amphiphile, peut induire l’assemblage auto-organisé de nanoparticules hydrophobes ?3. Est-ce que la présence des nanoparticules peut provoquer des transitions morphologiques d’un nanotube membranaire ?
Amphiphile molecules, endowed with a particular structure containing a hydrophilic head and a hydrophobic tail, have many important applications, e.g., fabrication of detergents, surface coating or surface functionalization, etc. Molecular aggregates of various forms, micelles, vehicle, membranes, etc. can be formed from amphiphile molecules. The complexity of these molecular aggregates involving a large number of atoms make the theoretical study of these system very challenging. Up to now, our understanding of the interaction between nanoparticles and aggregates of amphiphiles remains quite incomplete. Using a variety of molecular simulation methods and some theoretical approaches (Helfrich theory and perturbation theory), we have studied the following issues in the present thesis: 1. How the presence of nanoparticles, especially due to their highly curved surfaces, affects the aggregation of the amphiphiles? 2. How a lipid bilayer, a particular amphiphile aggregate, induces the self-assembly of hydrophobic nanoparticles.3. How the morphology transition of a membrane nanotube can be induced by nanoparticles?

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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 résultats obtenus mettent en lumière le rôle essentiel du ménisque d’huile entourant le pied de la goutte. Par la suite, deux expériences mettant en jeu une ligne de contact en reculée sont étudiées. La première correspond au démouillage d’un film mince, la deuxième à l’instabilité de perlage. Dans ces deux cas, le comportement qualitatif correspond à celui reporté dans la littérature sur des surfaces solides. Cependant, une étude plus approfondie révèle que la présence de l’huile affecte significativement la dynamique. Les écoulements dans l’eau et dans l’huile doivent alors être pris en compte simultanément. Ces travaux mettent ainsi en lumière l’originalité de ces surfaces, partiellement solides et partiellement liquides
This thesis aims at characterizing drops, bubbles and thin films dynamics on biomimetic textured surfaces, impregnated with oil (known as LIS in the literature). When an aqueous liquid is deposited on such surfaces, the four phases at stake (oil, air, textures and deposited liquid) generate multiple interfaces, playing a crucial role in the various dynamics observed. The viscous friction opposing the motion of a drop on an inclined LIS at low capillary numbers is studied as a function of the oil/drop viscosity ratio. The results revealed the crucial role of the microscopic oil meniscus surrounding the foot of the drop. Then, two experiments focusing on the dynamics of a receding contact lines are studied: the dewetting of a thin aqueous film and the pearling instability. In both cases, the qualitative behavior is similar to the one reported in the literature on conventional solid surfaces. However, a deeper study reveals that the presence of oil changes quantitatively the dynamics. The flow in both the aqueous and the oil phases must then be taken into account simultaneously. The results obtained in this work highlight the originality of those surfaces, and shed new light on the very peculiar role of the oil meniscus surrounding the contact lines

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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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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 the transformation on continuous heating, and the isothermal phase transformation kinetics were used to predict the continuous heating kinetics. It was found that the kinetic model significantly underpredicted the transformation start time during continuous heating. This was attributed to the large experimental error inherent in the estimation of the isothermal transformation start time, t[formula omitted]. The model's continuous heating kinetic predictions were excellent at low heating rates, but it tended to overpredict the kinetics at higher heating rates. The problem was traced to an observed difference between the measured temperature and the programmed temperature during the high heating rate tests. When the model was modified to incorporate the actual temperature profile, its prediction of the kinetics was considerably improved. Thus the austenite reversion transformation was concluded to be experimentally additive. An average Avrami n value of 2.2 suggested that austenite was nucleating on pearlite colony corners and edges. This conclusion was verified with optical and scanning electron microscopy. Previously published data, which indicated that the pearlite-to-austenite transformation is isokinetic, was found to be based on questionable assumptions. Metallographic information suggests, however, that the nucleation sites are saturated early in the reaction. Furthermore, the isothermal austenite formation data generated in this work was found to meet the effective site saturation criterion for additivity, implying that the austenitization process would be expected to be additive. The effect of starting microstructure was evaluated by performing isothermal and continuous heating tests on two different pearlitic microstructures. It was found that, in agreement with published results, the transformation rate varied in inverse proportion with the pearlite spacing and colony size.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate

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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 hardness of the steel should intuitively matter in determining the wear rate. Nevertheless, the relationship between the rate of material loss and steel hardness is unlikely to be monotonic. The purpose of the work presented in this thesis was primarily to study the abrasive wear behavior of a nanostructured bainitic steel that has been successful in structural applications, is capable of mass production, and can achieve hardness levels comparable to martensitic steels without compromising ductility, toughness and fatigue resistance. A variety of wear mechanisms have been studied, in each case with a detailed characterisation of the damage, the structural evolution and a panoply of theoretical approaches. In the case of three-body abrasion, it is found that huge variations in hardness, achieved by changing the structure from pearlite, nanostructured bainite to martensite by heat treatment, do not lead to significant differences in the wear rate. This is because the wear mechanisms change, for example from severe sub-surface deformation leading to sticking in the case of pearlite, to brittle detachment of material in the martensitic state. The nanostructured bainite, on the other hand, undergoes reaustenitisation at the surface that leads to the formation of a fine martensitic layer with consequent surface hardening, in contrast to the pearlite and martensite, both of which soften at the contact surfaces. It is the presence of stable austenite in the nanostructured bainite that causes this difference, because austenitisation becomes easier to achieve. This hypothesis has been further tested by eliminating the austenite from the nanostructured bainite. The experiments confirm that a reaustenitised layer no longer forms during three-body abrasion. The softening observed on martensitic samples also disappears when similar tests are done on tempered martensite, indicating the effect of the localised heat generated during dry abrasion on untempered martensite. In contrast to three-body abrasion using silica where the weight loss is insensitive to hardness, the nanostructured bainite outperforms most commercial alloys of equivalent hardness, and sometime even harder materials, during dry rolling/sliding wear. The mechanisms involved have been rationalised in terms of structural damage mechanisms, the development of beneficial residual stresses, and detailed changes in crystallite size and dislocation character as a function of rolling. It has, in general, been possible to rationalise the observed variations in different types of wear tests and micro- or nanostructures, and it is believed that the work will be of use in designing commercially important products.

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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 the sample was measured with the digital image correlation. The influence of the amount of pre-strain, aging time and temperature, and the strain path reversals on the stress-strain response after aging has been measured experimentally. A maximum increase of 46 MPa was obtained in the yield stress of the samples re-strained after full aging in the same direction as the initial straining. This maximum increase in yield stress as well as the rate of increment in yield strength during aging was almost independent of the amount of pre-strain and the increase in the flow stress occurred without a significant variation in the work hardening behavior. Further, it was shown that a yield point phenomenon was absent if the direction of re-straining after aging was reversed and the increase in the flow stress level after aging was proportional to the amount of pre-strain and increased with extended aging time. In this case, the absence of a sharp yield point after prolonged aging time led to the speculation that the activation of dislocations sources, rather than unpinning of locked dislocations in re-straining after aging was the controlling mechanisms although proof of this requires further investigation. Although it is difficult to unambiguously identify all of the underlying physical mechanisms, nevertheless, a comprehensive set of experimental results has been measured which can be used by the design engineer when considering cases where static strain ageing and strain path reversals are relevant for a ferrite-pearlite steel with 0.16 wt% carbon.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate

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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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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 detail. The data and the limitations of this study are also discussed. Data mining processes were used to gain insight into the data and the condition of the insulation system. The different stages of data mining are explained. The different stages are: identifying the problem, &tC1 understanding, data preparation and data analysis. An analysis was done using self-organizing maps, which is an unsupervised neural network technique. Hierarchical and K-mean clustering techniques were used to classify the data. The results of the different techniques were compared to an expert's assessment. The study is was an attempt to understand the condition of the insulation system and to classify the data according to its condition. A comparison was done between the different techniques used. The data was divided into four groups based on the voltage rating and class of insulation used in the motors. Good classification was obtained for three out of the four groups of data. In conclusion, the patterns in the different features of the data due to ageing were observed. The data was qualitatively assessed and classified into groups according to the deterioration of the insulation system using the classification techniques. Finally the results correlated well with the expert's assessment. In essence, the goals set for the research were achieved.
Thesis (M.Ing. (Electrical and Electronic Engineering))--North-West University, Potchefstroom Campus, 2007.

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Books on the topic "Pearling"

Pearling in the Arabian Gulf: A Kuwaiti memoir. London: LCAS, London Centre of Arab Studies, 2000.

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Harmer, Wendy. Pearlie and sapphire. North Sydney, N.S.W: Random House Australia, 2007.

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Very, very Pearlie. Milsons Point, N.S.W: Random House Australia, 2005.

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Bond, Michelle. Pearlie kings and queens. [Derby]: Derbyshire College of Higher Education, 1986.

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Haile, Bartee. Pearland, Texas: A centennial celebration. Virginia Beach, Va: Donning Co., 1994.

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Ferguson, Rosalie B. The history of Pearland, Texas. Pearland, Tex. (2602 Green Tee, Pearland 77581): R.B. Ferguson, 1993.

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Kropp, Diane Tofte. Old Settler's Cemetery, Pearland, Texas. [Pearland, Tex: D.T. Kropp, 1986.

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Harmer, Wendy. Pearlie and great aunt Garnet. Milsons Point, N.S.W: Random House Australia, 2007.

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Harmer, Wendy. Pearlie and great aunt Garnet. Milsons Point, N.S.W: Random House Australia, 2007.

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C.D. & A.R. Day, ed. Mahina: Things are not always what they seem. Queensland, Australia: C.D. & A.R. Day, 2013.

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Book chapters on the topic "Pearling"

Motisi, Marco, Filippo Casarin, Gionata Rizzi, Franco Pianon, Alessandro Zamara, and Lucia Gomez-Robles. "The Bahrain Pearling Path: Urban Planning, Structural Investigation and Design of the Strengthening Interventions." In RILEM Bookseries, 1830–38. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-99441-3_196.

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Gooch, Jan W. "Pearlite." In Encyclopedic Dictionary of Polymers, 521. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8499.

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Bhadeshia, Harshad K. D. H. "Pearlite." In Theory of Transformations in Steels, 497–518. Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003056782-12.

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Ostroff, Samuel. "Can the Oyster Speak? Pearling Empires and the Marine Environments of South India and Sri Lanka, c. 1600–1900." In Animal Trade Histories in the Indian Ocean World, 65–98. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42595-1_3.

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Durand-Charre, Madeleine. "The pearlite transformation." In Microstructure of Steels and Cast Irons, 195–208. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08729-9_10.

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Cahn, J. W., and W. C. Hagel. "Theory of the Pearlite Reaction." In The Selected Works of John W. Cahn, 127–31. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788295.ch17.

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Cahn, J. W., and W. C. Hagel. "Theory of the Pearlite Reaction." In The Selected Works of John W. Cahn, 133–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788295.ch18.

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Hao, Wang, Liu Guoquan, and Xu Kuangdi. "Pearlite, Structure and Characteristic of." In The ECPH Encyclopedia of Mining and Metallurgy, 1. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0740-1_191-1.

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Ouellette, Pierre. "Please, Portland, Don’t Pearlize Joe’s Garage." In Social Culture and High-Tech Economic Development, 120–21. London: Palgrave Macmillan UK, 2006. http://dx.doi.org/10.1057/9780230597242_17.

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Zolotorevsky, Nikolay, D. M. Vasiliev, and Yuri Titovets. "X-Ray Study of Microstresses in Lamellar Pearlite." In Materials Science Forum, 1511–16. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-975-x.1511.

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Conference papers on the topic "Pearling"

TIREL, Christophe, Marie-Charlotte RENOULT, Christophe DUMOUCHEL, and Jean-Bernard BLAISOT. "Poster: Fractal pearling." In 72th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2019. http://dx.doi.org/10.1103/aps.dfd.2019.gfm.p0023.

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KOZULIC, Maxime, Mohsen MIRZAEI, Gilles GODARD, Denis LEBRUN, Olivier CRUMEYROLLE, and Marie-Charlotte RENOULT. "Video: 3D monitoring of a pearling instability." In 72th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2019. http://dx.doi.org/10.1103/aps.dfd.2019.gfm.v0034.

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"Pearling: Stroke Segmentation with Crusted Pearl Strings." In International Workshop on Image Mining. Theory and Applications. SciTePress - Science and and Technology Publications, 2008. http://dx.doi.org/10.5220/0002340801030112.

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Valchev, G. S., P. A. Djondjorov, V. M. Vassilev, and D. M. Dantchev. "Van der Waals interactions between planar substrate and tubular lipid membranes undergoing pearling instability." In APPLICATION OF MATHEMATICS IN TECHNICAL AND NATURAL SCIENCES: 9th International Conference for Promoting the Application of Mathematics in Technical and Natural Sciences - AMiTaNS’17. Author(s), 2017. http://dx.doi.org/10.1063/1.5007402.

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Thiebaux, Pascal, Gil Pinheiro, and Laurent Witz. "Quenottes (Pearlies) [mp4] (Luxembourg)." In SA '16: SIGGRAPH Asia 2016. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/2997500.2997541.

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Khan, Abida, and Mark Major. "From residential village to heritage marketplace: evaluation morphological transformation and their use consequences over time in the historic settlement of Al-Wakran, Qatar." In Post-Oil City Planning for Urban Green Deals Virtual Congress. ISOCARP, 2020. http://dx.doi.org/10.47472/brdx7943.

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Many people consider Al Wakrah to be a distinctive settlement for cultural heritage in the State of Qatar. Based on archaeological evidence, the area of Al Wakrah was perhaps the first urban center of Qatar. Originally a fishing and pearling village like the capital city of Doha, globalization and rapid urbanization also characterized the development of Al Wakrah over the last halfcentury, leading to a remarkable transformation in the morphology of the settlement. The paper studies this morphological transformation of Al Wakrah and the consequences for socioeconomic and functional use. In doing so, the paper offers some clarity about the identity and dynamics of Al Wakrah as a traditional heritage district today; specifically, Souq Al Wakrah. We explore this within the context of traditional marketplaces in general, and souqs in the Arab States of the Gulf Cooperation Council (GCC) region in particular. The study explores the symbiotic relationship between urban morphology, land use, and function in settlement form. The purpose is to develop a deeper understanding of urban changes and expansion on the use and experience of Souq Wakrah as a public place today. Researchers apply several representational techniques standard in morphological studies, including analysis of urban spatial networks using space syntax. The findings of the paper indicate the design and planning nature of Souq Wakrah as a contemporary heritage re-creation. It contrasts with more straightforward examples of historic preservation and restoration in other traditional marketplaces of Qatar itself and elsewhere in the world. This situation arose due to the nearcomplete demolition of most historic structures in Al Wakrah during the recent past, except for a few isolated examples. However, a few important ‘traces’ of Al Wakrah’s morphological history remain consistent over time, despite the dramatic transformations in the rest of the settlement over time. The paper concludes by discussing the potential implications for design and planning policy in the protection and preservation of historic resources in the State of Qatar. It argues for the critical importance of developing a clear understanding of the relationship between form, function, and the urban context of such places in future preservation projects.

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Alraouf, Ali. "The value of less and small: transforming metropolitan Doha into connected, human and resilinet urban settlements." In 55th ISOCARP World Planning Congress, Beyond Metropolis, Jakarta-Bogor, Indonesia. ISOCARP, 2019. http://dx.doi.org/10.47472/imvt3881.

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Qatar is one of few Middle Eastern oil producing countries that realized the vitality of a needed swift transformation from resources to knowledge economy. Until a few decades ago, Qatar was dominated by nomadic people whose livelihood depended on fishing, pearling, camel breeding, and fishing ships building. However, the discovery of oil and gas has encouraged not only socio-economic change, but environmental change as well. The discussed account will cover the main strategies adopted by the country to create a distinctive model of development in the Middle East. The study also analyzes the shift over the past decade which reveals how Qatar views investments in knowledge-based urban development as essential vehicles to survive in a globalized and competitive world. More significantly, the study illustrates an interesting form of urban resilience in the face of major challenges which faced Qatar in the last decade including, winning the bid to host the FIFA World Cup 2022, the decline of oil prices and the air, sea and ground blockade imposed by its adjacent neighbors. The study sheds light on different urban planning strategies and policies adopted to shift the focus from creating a mega city with an image which resonate with typical global cities to a more sustainable, resilient, knowledge-based and decentralized urbanity. The model of Qatar is analyzed holistically in the paper to go form the strategic planning decisions all the way to case studies and best practice planning projects. The study demonstrates how Qatar has captured the world’s imagination by balancing global aspirations and local necessities in a sustainable and resilience context. This paper examines a framework for city and urban regions inspired by the theory of placemaking and its relevance to the boundaries of human urbanism. The paper sheds new light on the transformation of the city from a metropolitan exploiting the oil and gas revenues to a multi-centered model of urbanism. In doing so, the city adopted a number of significant strategies include the well distributed livable urban centers, transit-oriented development, introducing compacted urbanism and encouraging models of mixed use development. The paper concludes with a planning matrix which suggest that for Qatar, adopting such strategies and the deliberate move towards multi=centered urbanism is inevitable in the age of post globalizing world, the need for an urban human scale and the challenges of post Carbon paradigm.

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Shlyakhova, Galina V., Lev B. Zuev, and Anna V. Bochkareva. "Study of pearlite using atomic force microscopy." In PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083524.

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Gupta, Surendra Kumar, and Patricia Iglesias Victoria. "Atomic Force Microscopy of Annealed Plain Carbon Steels." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50972.

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Microstructure of annealed plain carbon steels is examined using optical microscopy. When the inter-lamellar spacing in pearlite is small, optical microscope at 1000X is unable to resolve the ferrite and cementite lamellae. In hyper-eutectoid steels, cementite in pearlite appears as darker phase whereas the pro-eutectoid cementite appears as a lighter phase. Atomic force microscopy (AFM) of etched steels is able to resolve ferrite and cementite lamellae in pearlite at similar magnifications. Both cementite in pearlite as well as pro-eutectoid cementite appear as raised areas (hills) in AFM images. Interlamellar spacing in pearlite increases with increasing hardenability of steel.

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Arreola-Villa, S., P. Garnica-González, M. López-Cornejo, O. Vázquez-Gómez, and H. Vergara-Hernández. "Pearlite Spheroidization and Its Relationship with Tensile Strength." In MS&T19. TMS, 2019. http://dx.doi.org/10.7449/2019mst/2019/mst_2019_631_637.

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