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Dissertations / Theses on the topic 'Ultrafond'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 January 2023

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1

Zontsika, Nöel Alain. "Modélisation multiéchelle du couplage élasto-plasticité-endommagement par décohésion en grandes déformations." Thesis, Paris 13, 2014. http://www.theses.fr/2014PA132024/document.

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Depuis quelques décennies, l’élaboration et l’étude des propriétés physiques et mécaniques des microstructures UFG et NC se sont fortement développées. L’intérêt croissant suscité par ces matériaux provient des comportements nouveaux qu’ils présentent et qui ouvrent des perspectives prometteuses d’applications dans divers domaines des sciences et d’ingénieries. Des secteurs d’activité à forte valeur ajoutée et aux enjeux économiques importants tels que la microélectronique, les télécommunications, l’aéronautique, l’énergie et l’armement s’y intéressent. En mécanique, l’intérêt porté à ces micr

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Paiva, Otávio Augusto. "Resíduo Industrial de vidro moído em argamassa de cimento Portland." Universidade Federal do Amazonas, 2009. http://tede.ufam.edu.br/handle/tede/3480.

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Made available in DSpace on 2015-04-22T22:08:50Z (GMT). No. of bitstreams: 1 DISSERTACAO_OTAVIO AUGUSTO PAIVA.pdf: 8701931 bytes, checksum: fa7ddfc8f71e05d7fe06a55c98faefc8 (MD5) Previous issue date: 2009-08-07<br>Fundação de Amparo à Pesquisa do Estado do Amazonas<br>The experimental program of the present project was developed in order to evaluate the residue performance of ground plain glasses in cement based paste and mortar. Different conditions of grounding were used to generate a material with particles of the same order of magnitude of the cement particles. The ground glass residue

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3

Rochat, Nadège. "Analyse énactive de l'activité en trail et ultra-trail : une approche multi-sourcing." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR037/document.

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L’objectif de cette thèse était d’analyser l’activité en trail et ultra-trail en s’inscrivant dans le paradigme de l’énaction (Varela et al., 1993). Un observatoire multi-sourcing composé de discussions de forum, de récits de courses postés sur les blogs, d’entretiens énactifs et de données en troisième personne caractérisant les accélérations verticales du traileur et de son système de portage a été construit pour mener nos analyses. Les résultats des analyses des discussions de forums ont montré que les traileurs partagent des préoccupations relatives à l’entraînement et l

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4

Liu, Qiaoling. "Ultrafine particle generation and measurement." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3971.

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Ultrafine particles (UFPs) with diameters smaller than 100 nm are omnipresent in ambient air. They are important sources for fine particles produced through the agglomeration and/or vapor condensation. With their unique properties, UFPs have also been manufactured for industrial applications. But, from the toxicological and health perspective, ultrafine particles with high surface-to-volume ratios often have high bio-availability and toxicity. Many recent epidemiologic studies have evidence UFPs are highly relevant to human health and disease. In order to better investigate UFPs, better instru

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5

Nilsson, Daniel, and Dennis Lundgren. "Betongens hållfasthetsutveckling vid användning av olika ersättare för portlandklinker : En laborativ studie." Thesis, KTH, Byggteknik och design, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101677.

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Tillverkning av portlandklinker står för ungefär fem procent av världens totala koldioxidutsläpp. Det finns därför ett allmänt intresse att minska användandet av portlandklinker. Klinkern kan antingen ersättas av andra cementerande material, eller så kan nya cementsnåla recept utformas. I den här rapporten har två cement med inmald flygaska respektive slagg från Cementa AB undersökts. För att undersöka klinkerersättnings-materialens potential har tester för tryckhållfasthet, uttorkningskrympning, bindetid, värmeutveckling och arbetbarhet utförts. Resultaten visar att skillnaderna mellan försök

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6

SANTOS, Juliano Barbosa dos. "Aplicação de modelos cinético e energético para análise da fragmentação ultrafina de partículas de calcário e quartzo em moinho planetário de bolas." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/19486.

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Submitted by Rafael Santana (rafael.silvasantana@ufpe.br) on 2017-07-10T18:48:53Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Dissertação completa.pdf: 8076647 bytes, checksum: 5dc16e9ca5f10026afed3fda08fda16b (MD5)<br>Made available in DSpace on 2017-07-10T18:48:53Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Dissertação completa.pdf: 8076647 bytes, checksum: 5dc16e9ca5f10026afed3fda08fda16b (MD5) Previous issue date: 2016-05-12<br>Minerais industriais em faixas ultrafinas (< 10 μm) tê

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7

Washbourne, Martyn Edward. "Bus user exposure to ultrafine particles." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509496.

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8

Hama, Sarkawt Muhammad Lateef. "Ultrafine particles in the urban environment." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42396.

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Ultrafine particles (UFP) are the smallest constituents of atmospheric particulate matter (PM). Until now, their potential adverse effects on human health are of great concern because of their specific properties and acting mechanisms. The work in this thesis focuses on the measurement of UFP and their effect and contribution to air quality in Leicester, UK and a set of cities in North West (NW) Europe. The thesis explores novel work around new particle formation (NPF) events and their association with Lung Deposited Surface Area (LDSA) in an urban environment. A final focus of this thesis was

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9

Freeland, Chad Lee. "Low Temperature Drying of Ultrafine Coal." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/76750.

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A new dewatering technology, called low temperature drying, has been developed to remove water from ultrafine (minus 325 mesh) coal particles. The process subjects partially dewatered solids to intense mechanical shearing in the presence of unsaturated air. Theoretical analysis of the thermodynamic properties of water indicates residual surface moisture should spontaneously evaporate under these conditions. This is contingent on the large surface area of these fine particles being adequately exposed to an unsaturated stream of air. To demonstrate this process, three dispersion methods were sel

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10

Pugsley, Victoria Antonietta. "The erosion of ultrafine WC-Co." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/19805.

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A series of four ultrafine WC-Co alloys of varying cobalt contents has been sintered from powder produced through the spray conversion process. The materials have been characterised and subjected to slurry erosion and cavitation erosion. A further twelve WC-Co alloys of varying grain sizes and cobalt contents have been produced through conventional processes and subjected to the same tests in order to provide data for comparison. The erosion resistance of all the grades tested was found to increase with decreasing grain size, both under cavitation erosion and slurry erosion conditions. Further

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11

Pougis, Arnaud. "Affinement de microstructures de métaux par des déformations plastiques extrêmes." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0332/document.

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Depuis plusieurs années, les procédés à grandes déformations plastiques (SPD) sont développés pour affiner la microstructure de métaux afin d’obtenir des tailles de grains submicroniques. Cet affinement confère au matériau des propriétés améliorées (ex : limite élastique). Durant ces procédés, la géométrie globale du matériau reste inchangée. C’est pourquoi les procédés sont spécifiques pour une géométrie donnée. Dans cet objectif, un procédé récemment inventé au sein du LEM3, nommé HPTT - High Pressure Tube Twisting – permet de nanostructurer des échantillons tubulaires. Un tube est confiné p

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12

Vogt, Carsten. "Ultrafine particles in concrete : Influence of ultrafine particles on concrete properties and application to concrete mix design." Doctoral thesis, KTH, Betongbyggnad, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12161.

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13

Calcagnotto, Marion [Verfasser]. "Ultrafine grained dual-phase steels / Marion Calcagnotto." Aachen : Shaker, 2011. http://d-nb.info/1075437237/34.

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14

Tao, Runzhi. "Preparation and Characterization of Ultrafine Si3N4 Powder." Doctoral thesis, Universite Libre de Bruxelles, 1996. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212344.

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15

Sangem, Vishnu Charan. "Low carbon ultrafine grained dual phase steels." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42328.

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Ultrafine grained (UFG) (i.e. grain size of the order 1 µm) dual phase (DP) steels have been investigated using a thermo-mechanical process designed to obtain fine ferrite-carbide aggregates prior to intercritical annealing. The effects of carbon content, alloying additions, initial starting structures and processing parameters like heating and cooling rate on the mechanical properties have been quantified. Experimental work was conducted on two plain low carbon steels (0.06 and 0.12 wt pct C) and two low carbon (0.06 wt pct) micro-alloyed steels, one with Mo (0.15 wt pct) and the other with N

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16

Wells, S. "Preparation and properties of ultrafine magnetic particles." Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237506.

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17

Gao, Si. "Yield Point Phenomena in Ultrafine Grained Materials." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215534.

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18

Feng, Michael Yuan. "Ultrafine aerosol deposition in planar channel flow." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/40562.

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19

Hung, Isaac, and Isaac Hung. "Ultrafine Bubble-Enhanced Ozonation For Water Treatment." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/621853.

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Ultrafine bubbles, often referred to as nanobubbles, have been used in various applications from environmental remediation to medicine. Even though the technology to generate ultrafine bubbles has been around for many years, the full potential of its applications has not been completely studied. This project seeks to study the use of ultrafine bubble technology for water treatment in combination with ozone gas. A factorial design experiment was chosen to test the effects of ultrafine bubbles on the concentration of an indicator organism, E. coli, in water as well as their effects on ozone gas

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20

Hoey, Justin Michael. "Aerosol-Based Ultrafine Material Deposition for Microelectronics." Diss., North Dakota State University, 2012. https://hdl.handle.net/10365/26826.

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Aerosol-based direct-write refers to the additive process of printing CAD/CAM features from an apparatus which creates a liquid or solid aerosol beam. Direct-write technologies are poised to become useful tools in the microelectronics industry for rapid prototyping of components such as interconnects, sensors and thin film transistors (TFTs), with new applications for aerosol direct-write being rapidly conceived. This research aims to review direct-write technologies, with an emphasis on aerosol based systems. The different currently available state-of-the-art systems such as Aerosol Jet? CAB-

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Joutsensaari, Jorma. "Aerosol synthesis of nanostructured, ultrafine fullerene particles /." Espoo [Finland] : Technical Research Centre of Finland, 1999. http://www.vtt.fi/inf/pdf/publications/1999/P400.pdf.

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22

Glagolenko, Stanislav Yurievich. "Single-ultrafine-particle mass spectrometer development and application." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1083.

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A single-ultrafine-particle mass spectrometer was constructed and deployed for size-resolved ultrafine aerosol composition measurements during the winter of 2002-2003 in College Station, Texas. Three separate experiments were held between December and March with six week intervals. Almost 128,000 mass spectra, corresponding to particles with aerodynamic diameters between 35 and 300 nm, were collected and classified. Fifteen statistically significant classes were identified and are discussed in this paper. Nitrate, potassium, carbon, and silicon/silicon oxide were the most frequently observed i

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Yu, Zhimin. "Flocculation, hydrophobic agglomeration and filtration of ultrafine coal." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/NQ39010.pdf.

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24

Tian, Yingtao. "Electrodeposition of indium bumps for ultrafine pitch interconnections." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7122.

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Microelectronics integration continuously follows the trend of miniaturisation for which the technologies enabling fine pitch interconnection are in high demand. The recent advancement in the assembly of Hybrid Pixel Detectors, a high resolution detecting and imaging device, is an example of where novel materials and processes can be applied for ultra-fine pitch interconnections. For this application, indium is often used for the fine pitch bump bonding process due to its unique properties that make it especially suitable, in particular in a cryogenic environment where some types of detector h

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25

Moal, Steven. "Photoassociation à 2 photons de l'hélium métastable ultrafroid." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2006. http://tel.archives-ouvertes.fr/tel-00840000.

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Au voisinage de la condensation de Bose-Einstein, les propriétés collisionelles d'un gaz dilué d'hélium métastable He* dans l'état 23S1 sont gouvernées par les collisions auto-ionisantes de type Penning, et par la longueur de diffusion en onde s, notée "a". Nous avons mesuré "a" par photoassociation à deux photons formant une molécule contenant deux atomes métastables He* dans l'état le moins lié du potentiel d'interaction entre deux atomes métastables polarisés de spin. La mesure de l'énergie de liaison de cette molécule par résonance noire atomes-molécules permet d'en déduire la longueur de

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26

Carnerero, Quintero Cristina. "Dynamics of ultrafine particles and tropospheric ozone episodes." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672660.

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Atmospheric aerosol particles, particularly ultrafine particles (UFPs; particles with less than 100 nm in diameter), and tropospheric ozone (O3) are atmospheric pollutants highly influenced by photochemical reactions, i.e., processes initiated by the absorption of solar radiation. High concentrations of ambient UFPs and O3 have important adverse effects on human health and impact on climate. Areas with high insolation and atmospheric dynamics favoring the accumulation of pollutants by vertical recirculation of air masses, such as the Western Mediterranean and other regions of Southern Europe,

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27

Keyser, Paul Martin. "Continuous column flotation of ultrafine coal using microbubbles." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/90973.

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A flotation column has been developed Incorporating the use of fine air bubbles (less than 100 microns) to remove ash-forming minerals from micronized coal. The microbubble generator used In this work has been characterized and found to yield a very narrow size distribution. Microbubble column flotation tests have been conducted to study a series of operating variables such as time, bubble size, feed rate, feed point, feed percent solids, column height, bubble number concentration, make-up water addition and countercurrent wash water addition. The results show that i) fine air bubbles are Inhe

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Buys, Irmtraud Erna. "A liberation study on ultrafine South African coals." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/17704.

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Bibliography: pages 146-150.<br>South African coal mines generate large quantities of fines as a result of the increased use of mechanised mining methods. Generally, these fines are discarded. They do however contain relatively large proportions of high grade material, which provides a considerable incentive for their beneficiation. The increasing demand for low-ash and superlow- ash coals is an added price incentive for fines beneficiation. As coal is a highly heterogeneous substance, it is necessary, in order to optimize beneficiation processes, to have a good understanding of its liberation

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Sacks, Natasha. "The fracture toughness of ultrafine WC-Co Alloys." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/20181.

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Bibliography: pages 147-152.<br>This thesis examines the fracture toughness behaviour of a series of cemented carbides having carbide grain sizes between 0.35f.Lm and 4f.Lm, cobalt contents ranging from 6 to 15wt%, and vanadium carbide contents from 0 to 0.8wt%. A series of twenty-four ultrafine WC-Co alloys were sintered from powders produced through three different production routes, namely, the spray conversion process and two variations of the conventional powder production methods. A further twelve WC-Co alloys with three different carbide grain size distributions were produced through co

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30

Zhang, Ke. "Ambient and plume processing of atmospheric ultrafine particles /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.

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31

Kejík, Pavel. "Low-Cost Filtration Barriers for Ultrafine Particles Separation." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401605.

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V mnoha oborech jsou stále využívána anorganická filtrační media založená na materiálech, jejichž výroba využívá primární suroviny. Jejich výroba je tedy energeticky náročná a v důsledku nákladná a neohleduplná k životnímu prostředí. Cílem této práce je ověřit možnost využití alkalicky aktivovaných materiálů na bázi sekundárních surovin, především vysokopecních strusek (BFS) a popílků z uhelných elektráren (FA), pro výrobu porézních médií schopných v budoucnosti nahradit keramické a jiné anorganické filtry. Výzkum je rozvinut skrze experimentální design založený na výpočetním schématu samostat

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Thomas, Stephen Bradley. "Characterisation of ambient fine and ultrafine atmospheric aerosols." Thesis, Queensland University of Technology, 2001.

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Clifford, Sam. "Spatio-temporal modelling of ultrafine particle number concentration." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/63528/4/Samuel_Clifford_Thesis.pdf.

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This thesis developed semi-parametric regression models for estimating the spatio-temporal distribution of outdoor airborne ultrafine particle number concentration (PNC). The models developed incorporate multivariate penalised splines and random walks and autoregressive errors in order to estimate non-linear functions of space, time and other covariates. The models were applied to data from the "Ultrafine Particles from Traffic Emissions and Child" project in Brisbane, Australia, and to longitudinal measurements of air quality in Helsinki, Finland. The spline and random walk aspects of the

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Karamanoukian, Antranik. "Dispersion of cement-based grout with ultrasound and conventional laboratory dissolvers." Thesis, KTH, Byggvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-283530.

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In any underground facilities especially tunnels, it is essential to seal the area against water ingress and leakage of reserved materials. Grouting is a common method used to seal rocks around tunnels, successful grouting reduces the duration and cost of the construction, guarantees better working environment and higher safety, minimizes the maintenance and most important decreases the corresponding environmental hazards significantly. Achieving a sufficient grout spread is one of the prerequisites for a successful and efficient sealing, the penetration of a grout is defined as the length of

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Pokharel, Binod. "The removal of ultrafine nuclei in mountain wave clouds." Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=1798481611&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Nataf, Pierre. "ELECTRODYNAMIQUE QUANTIQUE DE CIRCUIT EN REGIME DE COUPLAGE ULTRAFORT." Phd thesis, Université Paris-Diderot - Paris VII, 2011. http://tel.archives-ouvertes.fr/tel-00761055.

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En Electrodynamique Quantique en Cavité (" Cavity QED "), l'interaction entre la transition atomique et le champ de la cavité est quantifiée par la fréquence de Rabi du vide. L'expression analogue " circuit QED " a été introduite pour certains circuits supraconducteurs contenant des Jonctions Josephson, parce qu'ils pouvaient se comporter comme des atomes artificiels couplés au mode bosonique du résonateur. Dans le régime où la fréquence de Rabi du vide est comparable à la fréquence de transition du système à deux niveaux, des transitions de phases quantiques superradiantes ont été prédites po

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Martin, Claire Louise. "Transportation of Urban Ultrafine Particles in Four Euorpean Cities." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511924.

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Jasevičius, Raimondas. "The Numerical Modelling of Normal Interaction of Ultrafine Particles." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20110224_161120-06365.

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Recently, powders of the size d (0.1 μm < d < 10 μm) have been referred to ultrafine particles. The particle shape considered is assumed to be a sphere of the diameter d. The handling of powders is of great importance for processing of pharmaceuticals, cement, chemicals and other products. Most of these technological processes involve powder compaction, storage, transportation, mixing, etc, therefore, understanding of the fundamentals of particles interaction behaviour is very essential in the design of machines and equipment as well as in powder technology, cleaning of environment and other a

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Dunford, Rosemary. "The effect of photoexcited ultrafine titanium dioxide on DNA." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389000.

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Viseur, Valérie. "Injectabilité des coulis de ciments ultrafins à ajouts minéraux." Toulouse 3, 1996. http://www.theses.fr/1996TOU30078.

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Le probleme pose est de formuler des coulis capables de penetrer correctement et durablement un reseau de fissures d'ouverture maximale 100 microns sous de faibles pressions d'injection. Nous proposons donc de realiser des coulis hydrauliques de ciments surfins. Leur durabilite sera d'autant meilleure que le rapport eau/liant sera faible, ce qui impliquera, pour qu'ils restent injectables, de realiser une fluidification optimale. L'injectabilite et la perennite des coulis pourront egalement etre ameliores par l'utilisation, en substitution du ciment, de differents ajouts microniques. Nous avon

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Nataf, Pierre. "Electrodynamique quantique de circuit en régime de couplage ultrafort." Paris 7, 2011. http://www.theses.fr/2011PA077223.

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En Electrodynamique Quantique en Cavité (QED), l'interaction entre la transition atomique et le champ de la cavité est quantifiée par la fréquence de Rabi du vide Ωo. L'expression analogue « circuit QED » a été introduite pour certains circuits supraconducteurs contenant des Jonctions Josephson, parce qu'ils pouvaient se comporter comme des atomes artificiels couplés au mode bosonique du résonateur. Dans le régime où Ωo est comparable à la fréquence de transition du système à deux niveaux, des transitions de phases quantiques superradiantes ont été prédites pour le fondamental du système, par

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Song, Rongjie. "Microstructure and mechanical properties of ultrafine grained C-Mn steels /." Aachen : Shaker, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014181308&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Azeez, Qaisar A. "Synthesis of ultrafine aluminum nitride powders in a flow reactor." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182779122.

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Maynard, Andrew David. "The collection and analytical electron microscopy of ultrafine aerosol particles." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281951.

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Li, Biao. "Hydrophobic-Hydrophilic Separation Process for the Recovery of Ultrafine Particles." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/103278.

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The demands for copper and rare earth elements (REEs) in the U.S. will keep rising due to their applications in green energy technologies. Meanwhile, copper production in the U.S. has been declining over the past five years due to the depletion of high-grade ore deposits. The situation for REEs is worse; there is no domestic supply chain of REEs in the U.S. since the demise of Molycorp, Inc. in 2016. Studies have shown that the rejected materials from copper and coal processing plants contain significant amounts of valuable metals. As such, this rejected material can be considered as potential

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Reiling, Vincent Gilbert. "The effects of ultrafine particles on powder cohesion and fluidization." Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056487089.

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Deb, Partha Sarathi. "Properties of Geopolymer Concrete Using Ultrafine Fly Ash and Nanosilica." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/75529.

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This study investigated the effects of ultrafine fly ash and nanosilica in geopolymers cured at room temperature. It was found that the optimum percentages of ultrafine fly ash and nanosilica with fly ash alone or that blended with 15% GGBFS or 10% OPC significantly improved strength and durability of geopolymers. The properties of geopolymer improved by enhancement of the hydrated phases and microstructure that reduced porosity.

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Garcia, de la Cruz Lucia. "Ultrafine grained nickel processed by powder metallurgy : microstructure, mechanical properties and thermal stability." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC224.

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La synthèse par métallurgie des poudres de nickel à grains ultrafins (UFG) a été effectuée, et l’effet de l’affinement de la microstructure sur le comportement mécanique et les propriétés physiques a été étudié. La possibilité de coupler le broyage et le frittage flash est étudiée avec des résultats prometteurs. Des échantillons de haute densité avec des tailles de grains d = 0.65 – 4 µm, caractérisés par une fraction élevée des joints de grains Σ3 et un faible niveau de contrainte ont été synthétisés. Les propriétés mécaniques des échantillons UFG montrent une bonne combinaison ductilité-rési

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Jain, Riddhika. "Processing of Low Rank Coal and Ultrafine Particle Processing by Hydrophobic-Hydrophilic Separation (HHS)." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51565.

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This thesis pertains to the processing of ultra-fine mineral particles and low rank coal using the hydrophobic--hydrophilic separation (HHS) method. Several explorative experimental tests have been carried out to study the effect of the various physical and chemical parameters on the HHS process. In this study, the HHS process has been employed to upgrade a chalcopyrite ore. A systematic experimental study on the effects of various physical and chemical parameters such as particle size, reagent dosage and reaction time on the separation efficiencies have been performed. For this, a copper rou

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Barrett, Terence. "Development and Characterization of Microfabricated Device for Real-Time Measurement of the Size and Number of Airborne Ultrafine Particles." ScholarWorks @ UVM, 2013. http://scholarworks.uvm.edu/graddis/17.

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Ultrafine particle emissions in motor-vehicle exhaust are associated with cardiopulmonary health impacts and increased mortality. The emission, evolution, and exposure-uptake of these particles, one hundred nanometers and smaller in diameter, are fundamentally quantified by the number concentration as a function of particle size. Ultrafine particle number distributions are widely varying and fast changing as they are strongly influenced by local environmental conditions and variation in vehicle operation and maintenance. Research and regulation to quantify and control such emissions rely on me

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