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Dissertations / Theses on the topic 'Characterization of impurities'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Kienkas, Liene. "Effect of Biofuel Impurities on the Diesel Oxidation Catalyst." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212558.

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Scania provides sustainable transport systems powered by bioethanol, biogas, biodiesel along with hybrid and conventional solutions. Today Scania offers the largest variety of engines operating on alternative fuels in the market. The number of the alternative fuel operated vehicles sold in 2016 increased by 40 % [1]. Nevertheless, one of the alternative fuels – biodiesel - is a source of inorganic contaminants. These impurities can detrimentally affect the diesel truck after-treatment system that is responsible for harmful emission abatement. As a consequence, better understanding of the alter

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2

Morishige, Ashley E. (Ashley Elizabeth). "Metal impurities in n-type crystalline silicon for photovoltaics : simulation, synchrotron-based characterization, and mitigation." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104131.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 193-211).<br>Crystalline silicon is the dominant technology in the rapidly-growing photovoltaics (PV) industry, but significant cost reduction is still required before widespread grid parity is achieved. One-quarter of the cost of a PV module is

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3

De, Lama Valderrama Noelia Milagros. "Development of new mass spectrometry methods for the characterization of protein impurities in therapeutic antibodies." Electronic Thesis or Diss., Strasbourg, 2025. http://www.theses.fr/2025STRAF008.

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Les protéines de cellule hôte (HCPs) sont des impuretés indésirables dans la production d’anticorps monoclonaux (mAbs), pouvant compromettre la sécurité, l’efficacité et la stabilité des traitements. Bien que l’ELISA soit couramment utilisée, elle présente des limites de couverture. Cette thèse explore des méthodes complémentaires basées sur la spectrométrie de masse. Une approche d’immuno-capture permet de détecter les HCPs non immune-réactifs, tandis que des workflows LC-MS/MS avancés avec des peptide standards offrent une quantification plus précise. Ces stratégies visent à améliorer le con

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4

PAOLETTI, Melissa. "Lewis acids in the preparation of the heterocyclic compounds: synthesis and characterization of the impurities of API." Doctoral thesis, Università degli Studi di Camerino, 2008. http://hdl.handle.net/11581/401761.

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The work reported on this thesis is the result of a collaboration between the University of Camerino and the Pfizer of Ascoli Piceno. This collaboration includes, but was not limited to, the confirmation of molecular structure of reference standards. The Reference Standard's Group supports manufacturing by certifying standards which are then used in the analysis and evaluation of a new lot of an active pharmaceutical drug. Due to the potential significant impact to manufacturing, in many cases a full study is needed to confirm the structure of the standards. Another interesting scientific aspe

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5

Yehya, Alissar. "Contribution to the experimental and numerical characterization of phase-change materials : consideration of convection, supercooling, and soluble impurities." Thesis, Artois, 2015. http://www.theses.fr/2015ARTO0207/document.

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Au cours des deux dernières décennies, le contexte économique a changé de manière significative en raison de la hausse des prix de l'énergie. Le bâtiment étant devenu le principal secteur consommateur d'énergie, la réduction de celle-ci est devenue un objectif économique, sociétal et environnemental. Ce sujet mobilise de nombreux travaux de recherche. Les Matériaux à Changement de Phase (MCP) représentent une solution innovante qui pourrait contribuer à améliorer la performance énergétique des bâtiments. Ils sont principalement utilisés pour la régulation de température, et leur forte capacité

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6

Ouaddah, Hadjer. "Study of crystalline defects issued from silicon solidification : effect of impurities and correlation between crystallography, physicochemical and electrical properties." Electronic Thesis or Diss., Aix-Marseille, 2021. http://theses.univ-amu.fr.lama.univ-amu.fr/211214_OUADDAH_370ltw379yep573fxydon897z_TH.pdf.

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Une approche expérimentale incluant plusieurs techniques a été utilisée pour caractériser les défauts structuraux issus de la solidification, par imagerie X in situ, et par des techniques complémentaires ex situ pour caractériser la structure de grains, la qualité cristalline et la déformation. La composition et la ségrégation des impuretés ont été corrélées avec la caractérisation des défauts et les propriétés électriques. Les analyses montrent l'influence significative des impuretés légères et métalliques sur la solidification du silicium et sur les propriétés électriques. En présence d'impu

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7

Nakashima, Gabriela Tami. "Use of sugarcane trash for solid biofuel production: physicochemical characterization and influence of storage time." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8955.

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Submitted by Milena Rubi (milenarubi@ufscar.br) on 2017-08-09T12:48:03Z No. of bitstreams: 1 NAKASHIMA_Gabriela_2016.pdf: 18948386 bytes, checksum: c4adf2165784091a5371108a8c2bd529 (MD5)<br>Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2017-08-09T12:48:12Z (GMT) No. of bitstreams: 1 NAKASHIMA_Gabriela_2016.pdf: 18948386 bytes, checksum: c4adf2165784091a5371108a8c2bd529 (MD5)<br>Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2017-08-09T12:48:18Z (GMT) No. of bitstreams: 1 NAKASHIMA_Gabriela_2016.pdf: 18948386 bytes, checksum: c4adf2165784

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8

Hu, Shengjun. "Production and Characterization of Bio-based Polyols and Polyurethanes from Biodiesel-derived Crude Glycerol and Lignocellulosic Biomass." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1374051355.

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9

Bykov, Igor. "Experimental studies of materials migration in magnetic confinement fusion devices : Novel methods for measurement of macro particle migration, transport of atomic impurities and characterization of exposed surfaces." Doctoral thesis, KTH, Fusionsplasmafysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145045.

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During several decades of research and development in the field of Magnetically Confined Fusion (MCF) the preferred selection of materials for Plasma Facing Components (PFC) has changed repeatedly. Without doubt, endurance of the first wall will decide research availability and lifespan of the first International Thermonuclear Research Reactor (ITER). Materials erosion, redeposition and mixing in the reactor are the critical processes responsible for modification of materials properties under plasma impact. This thesis presents several diagnostic techniques and their applications for studies o

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10

Riberi-Béridot, Thècle. "In situ characterization by X-ray synchrotron imaging of the solidification of silicon for the photovoltaic applications : control of the grain structure and interaction with the defects and the impurities." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0412/document.

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Au cours de cette thèse, nous avons étudié in situ la solidification du silicium à l’aide de l'imagerie X-synchrotron. Les deux techniques utilisées lors de la solidification sont la radiographie et la diffraction de Bragg, elles permettent de caractériser: la dynamique des mécanismes de croissance, la cinétique de croissance, la nucléation et la compétition de grains, la déformation du réseau cristallin et les champs de contraintes liés aux dislocations. Ces observations sont combinées avec des caractérisations ex situ pour étudier l'orientation cristallographique, les déformations du réseau

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11

Riberi-Béridot, Thècle. "In situ characterization by X-ray synchrotron imaging of the solidification of silicon for the photovoltaic applications : control of the grain structure and interaction with the defects and the impurities." Electronic Thesis or Diss., Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0412.

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Au cours de cette thèse, nous avons étudié in situ la solidification du silicium à l’aide de l'imagerie X-synchrotron. Les deux techniques utilisées lors de la solidification sont la radiographie et la diffraction de Bragg, elles permettent de caractériser: la dynamique des mécanismes de croissance, la cinétique de croissance, la nucléation et la compétition de grains, la déformation du réseau cristallin et les champs de contraintes liés aux dislocations. Ces observations sont combinées avec des caractérisations ex situ pour étudier l'orientation cristallographique, les déformations du réseau

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12

Cardoso, Hugo Ananias Inacio 1987. "Síntese, caracterização e cinética de formação do pó de [alfa]-fosfato tricálcico de elevada pureza : Synthesis, characterization and reaction kinetics of high purity [alpha]-tricalcium phosphate." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265904.

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Orientador: Cecilia Amelia de Carvalho Zavaglia<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-24T20:34:28Z (GMT). No. of bitstreams: 1 Cardoso_HugoAnaniasInacio_D.pdf: 8008219 bytes, checksum: ac8d13454298a5718b0e0051a87eb944 (MD5) Previous issue date: 2014<br>Resumo: O fosfato tricálcico (TCP) é um dos fosfatos de cálcio mais importantes dentre os utilizados como biomateriais devido à sua biocompatibilidade, bioatividade, biorreabsorbilidade e osteocondutividade. A fase ? (?-TCP) se destaca, principalmente, d

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13

Gehrke, Hans-Gregor [Verfasser], Hans [Akademischer Betreuer] Hofsäss, Christian [Akademischer Betreuer] Jooß, et al. "Electrical characterization of conductive ion tracks in tetrahedral amorphous carbon with copper impurities / Hans-Gregor Gehrke. Gutachter: Hans Hofsäss ; Christian Jooß ; Jörn Große-knetter ; Hans-ulrich Krebs ; Markus Münzenberg ; Michael Seibt. Betreuer: Hans Hofsäss." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2014. http://d-nb.info/1046446479/34.

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14

Pertermann, Eric. "Schnelle Dioden mit tiefen Donatoren aus Selen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-219603.

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Die Anforderungen an schnelle Dioden sind sehr hoch für große Spannungen und große Ströme. Die Beeinflussung des Bauelementverhaltens durch das Design des Dotierprofils mit einem tiefen mehrstufigen Feldstopp aus Selen bildet einen zentralen Punkt der Dissertation. Mit physikalischen Messverfahren werden die in der Literatur nur unzureichend untersuchten Eigenschaften von Selen in Silizium erfasst und als Basis für Bauelementsimulationen verwendet. Für die Untersuchung der Störstelleneigenschaften kommt die klassische aufwändige DLTS zum Einsatz. Des Weiteren werden für diese Untersuchungen di

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15

Pertermann, Eric. "Schnelle Dioden mit tiefen Donatoren aus Selen." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2016. https://monarch.qucosa.de/id/qucosa%3A20643.

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Die Anforderungen an schnelle Dioden sind sehr hoch für große Spannungen und große Ströme. Die Beeinflussung des Bauelementverhaltens durch das Design des Dotierprofils mit einem tiefen mehrstufigen Feldstopp aus Selen bildet einen zentralen Punkt der Dissertation. Mit physikalischen Messverfahren werden die in der Literatur nur unzureichend untersuchten Eigenschaften von Selen in Silizium erfasst und als Basis für Bauelementsimulationen verwendet. Für die Untersuchung der Störstelleneigenschaften kommt die klassische aufwändige DLTS zum Einsatz. Des Weiteren werden für diese Untersuchungen di

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16

Jwo, Shyh-Shyan, and 卓世賢. "Characterization of Sesamol and It's Related Impurities." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/3nmzb5.

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碩士<br>朝陽科技大學<br>應用化學系碩士班<br>91<br>This research is focused on the study of Sesamol, which is the main chemical intermediate used in the manufacture of the antidepressant drug called Paroxetine. The main objectives of this study are: 1) The identification of Sesamol’s impurities, including their physical and chemical properties. That information would be helpful for the drug manufacturer to reduce the production cost. 2) Comparison of the impurities analysis results using two different analysis methods (Gas chromatography and High Performance Liquid Chromatography) and select the one which ca

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17

Gehrke, Hans-Gregor. "Electrical characterization of conductive ion tracks in tetrahedral amorphous carbon with copper impurities." Doctoral thesis, 2013. http://hdl.handle.net/11858/00-1735-0000-0022-5DF0-A.

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Die Bestrahlung von tetraedrisch amorphen Kohlenstoff (ta-C) mit schnellen schweren Ionen führt zur Bildung von mikroskopischen elektrisch leitfähigen Ionenspuren mit Durchmessern um 10 nm. Dieses Phänomen ist auf das sp² zu sp³ Hybridisierungsverhältnis des amorphen Kohlenstoffes zurückzuführen. Das einschlagende Ion deponiert eine große Menge Energie innerhalb des Spurvolumens, so dass eine Materialtransformation hin zu höheren sp² Hybridisierung stattfindet. Hierdurch wird die elektrische Leitfähigkeit der Ionenspur stark erhöht. Dieser Effekt kann durch die Zugabe von Verunreinigungen wi

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18

Shiu, Je-Jang, and 許哲彰. "Preparation and characterization of LiFePO4 cathode materials with impurities of Fe2P and Li3PO4." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/92729936914562099193.

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碩士<br>大同大學<br>材料工程學系(所)<br>98<br>In this study, a solution method was used to prepare stoichiometric olivine structured LiFePO4 at various heat treatment temperatures and LiFe1-xPO4 (0≤ x ≤ 0.09) cathode materials. The crystalline structures, compositions, carbon contents, and morphology of the synthesized samples were investigated with XRD, ICP-OES, PSA, EA, and SEM. The electrochemical properties of synthesized samples were analyzed by capacity retention and cyclic voltammetric studies. From the results of XRD, Fe2P was found in samples heat-treated at temperatures higher than 800oC. However

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