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Dissertations / Theses on the topic 'Copper Spinel'

Author: Grafiati

Published: 12 October 2024

Last updated: 31 July 2025

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1

Abdelli, Hanen. "Ρrοductiοn phοtοcatalytique de l’hydrοgène à partir de l’acide fοrmique sοus lumière visible : phοtοcatalyseurs à base d’οxyde de cuivre et de fer". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC210.

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Le développement technologique visant à construire une société utilisant l'hydrogène comme moyen d'énergie, avec une faible charge environnementale et un rendement élevé, est nécessaire de toute urgence. Toutefois, l'hydrogène étant inflammable, les problèmes de sécurité liés à son stockage et à son transport limitent son utilisation en tant que combustible. L’utilisation des transporteurs organiques liquides d'hydrogène (TOLHs, ou LOHCs pour Liquid Organic Hydrogen Carriers) présente une alternative très prometteuse. Ils permettent de stocker et de transporter efficacement l'hydrogène avec un

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2

Nzaba, Sarre Kadia Myra. "Lithium manganese oxide modified with copper-gold nanocomposite cladding- a potential novel cathode material for spinel type lithium-ion batteries." University of the Western Cape, 2014. http://hdl.handle.net/11394/4444.

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>Magister Scientiae - MSc<br>Spinel lithium manganese oxide (LiMn2O4), for its low cost, easy preparation and nontoxicity, is regarded as a promising cathode material for lithium-ion batteries. However, a key problem prohibiting it from large scale commercialization is its severe capacity fading during cycling. The improvement of electrochemical cycling stability is greatly attributed to the suppression of Jahn-Teller distortion (Robertson et al., 1997) at the surface of the spinel LiMn2O4 particles. These side reactions result in Mn2+ dissolution mainly at the surface of the cathode during cy

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3

Dörfelt, Christoph [Verfasser], Klaus [Akademischer Betreuer] Köhler, Moniek [Gutachter] Tromp, Klaus [Gutachter] Köhler, and Kai-Olaf [Gutachter] Hinrichsen. "Synthesis, Reaction and Deactivation Mechanisms of Copper Aluminate Spinel Hydrogenation Catalysts / Christoph Dörfelt ; Gutachter: Moniek Tromp, Klaus Köhler, Kai-Olaf Hinrichsen ; Betreuer: Klaus Köhler." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1210643995/34.

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4

Chauvin, Camille. "Caracterisation d'oxydes de zinc et de catalyseurs de synthese du methanol cu-znal::(2)o::(4) : etude par spectroscopie infrarouge des sites d'adsorption et des mecanismes reactionnels." Caen, 1987. http://www.theses.fr/1987CAEN2017.

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5

Jones, Page. "Enzymatic and proteomic analysis of spinal cord in a G93A ALS mouse model." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008r/jonesp.pdf.

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6

Chen, Meng-Hsien. "Investigation of copper and cadmium in the food chain of three-spined stickleback populations, Gasterosteus aculeatus L., in the River Wandle, UK." Thesis, King's College London (University of London), 1992. https://kclpure.kcl.ac.uk/portal/en/theses/investigation-of-copper-and-cadmium-in-the-food-chain-of-threespined-stickleback-populations-gasterosteus-aculeatus-l-in-the-river-wandle-uk(2efa8185-45e3-46f8-ba3d-84a434eb0f7b).html.

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7

Chapman, Kimberly K., Michael J. Benton, Ralph O. Brinkhurst, and Phillip R. Scheuerman. "Use of the Aquatic Oligochaetes Lumbriculus Variegatus and Tubifex Tubifex for Assessing the Toxicity of Copper and Cadmium in Spiked-Sediment Toxicity Bioassay." Digital Commons @ East Tennessee State University, 1999. https://dc.etsu.edu/etsu-works/2881.

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A sediment toxicity test using the freshwater oligochaetes Lumbriculus variegatus and Tubifex tubifex was performed. We evaluated acute and chronic toxicity affects of copper and cadmium on reproduction in both species and the bioaccumulation of both metals by L. variegatus using artificial sediment. L. variegatus bioconcentrated copper 22‐fold and cadmium 16‐fold after a 14‐day exposure to spiked artificial sediments with 0.02% organic content. The EC50 for T. tubifex varied depending upon endpoint from 2.7 to 2.8 mg/L for cadmium and from 8.4 to 8.9 mg/L for copper. The EC50 for L. variegatu

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8

Кухарук, Юрій Ігорович, та Yuriy Kukharuk. "Моделювання динамічних характеристик шпиндельного вузла спеціального токарно-копіювального багаторізцевого напівавтомата з ЧПК". Master's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2018. http://elartu.tntu.edu.ua/handle/lib/27293.

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Роботу виконано на кафедрі конструювання верстатів, інструментів та машин Тернопільського національного технічного університету імені Івана Пулюя Міністерства освіти і науки України<br>В дипломній роботі здійснено розрахунок та конструювання основних виконавчих вузлів спеціального токарно-копіювального напівавтомата, моделювання динамічних характеристик шпиндельного вузла.<br>In the thesis the calculation and design of the main executive units of a special turning-copier semiautomatic lathe, modeling of dynamic characteristics of the spindle node is carried out.<br>Вступ; Перший розділ "загаль

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9

Pereira, Hugo Borges. "Avaliação de aditivos para remoção catalítica de SOx em unidades de fcc." Universidade do Estado do Rio de Janeiro, 2007. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7257.

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Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro<br>Os óxidos de enxofre (SOx) são um dos maiores poluentes atmosféricos e um dos precursores da chuva ácida. Um levantamento feito na Petrobrás mostrou que cerca de 17% dos SOx emitidos numa refinaria são oriundos do processo de FCC. Com o avanço dos controles ambientais, traduzido numa legislação mais restritiva, a técnica de incorporação de aditivos para remoção de SOx em UFCCs apresenta-se como a alternativa de menor custo frente outras tecnologias de abate das emissões de SOx. No presente trabalho, foram estudados aditivos constituí

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10

Residori, Sara. "FABRICATION AND CHARACTERIZATION OF 3D PRINTED METALLIC OR NON-METALLIC GRAPHENE COMPOSITES." Doctoral thesis, Università degli studi di Trento, 2022. https://hdl.handle.net/11572/355324.

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Nature develops several materials with remarkable functional properties composed of comparatively simple base substances. Biological materials are often composites, which optime the conformation to their function. On the other hand, synthetic materials are designed a priori, structuring them according to the performance to be achieved. 3D printing manufacturing is the most direct method for specific component production and earmarks the sample with material and geometry designed ad-hoc for a defined purpose, starting from a biomimetic approach to functional structures. The technique has the a

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11

Huang, Hong-Jhih, and 黃鴻志. "Growth and characterization of p-type spinel cobalt oxide and copper-cobalt oxide thin films." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4sf684.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>105<br>Cobalt oxide and copper-cobalt oxide thin films have been successfully deposited by reactive ion beam sputter deposition utilizing an anode layer ion source sputtering module. Samples were deposited at 150 and 300℃ at various oxygen flow rates on both Si and quartz substrates. Experimental results show that samples deposited at 150℃ are all amorphous, while both cobalt and copper-cobalt oxide deposited at 300℃ exhibit a spinel structure. Increasing oxygen partial flow rates results in deteriorated crystalline quality and reduced resistivity, while the introduc

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12

Sun, Zhihao. "Electrophoretically deposited copper manganese spinel protective coatings on metallic interconnects for prevention of Cr-poisoning in solid oxide fuel cells." Thesis, 2018. https://hdl.handle.net/2144/32593.

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Metallic interconnects in intermediate temperature solid oxide fuel cells (IT-SOFC) stacks form Cr2O3 scales on their surface. Such oxide scales can be further oxidized to Cr6+ containing gaseous species that migrate and deposit at the cathode triple phase boundaries, causing significant degradation in the performance of the SOFCs. This phenomenon is termed as ‘Cr-poisoning’. A solution to this problem is the application of coatings on the interconnects that act as a diffusion barrier to Cr migration. Two different Cu/Mn spinel compositions, Cu1.3Mn1.7O4 and CuMn1.8O4, were studied as coatin

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13

Wang, Ruofan. "Chromium poisoning of cathode in solid oxide fuel cells: mechanisms and mitigation strategies." Thesis, 2017. https://hdl.handle.net/2144/27046.

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Solid oxide fuel cells (SOFCs) have gained renewed interest due to their high energy-conversion efficiency, new discovery of fossil fuel sources, and low greenhouse gas emission. However, performance degradation during long-term operation is one of the greatest challenges to overcome for commercialization of SOFCs. At intermediate temperatures, chromium (Cr) vapor species that form over chromia-forming alloy interconnect, can transport and deposit in the cathode, and poison the cathode performance. Although extensive studies have been conducted on the Cr-poisoning phenomena, the mechanism of c

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14

Παπαβασιλείου, Ιωάννα. "Παραγωγή υδρογόνου μέσω αναμόρφωσης της μεθανόλης με οξειδικούς καταλύτες χαλκού". 2008. http://nemertes.lis.upatras.gr/jspui/handle/10889/1691.

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Σκοπός της παρούσας διδακτορικής διατριβής ήταν η ανάπτυξη ενός αποτελεσματικού καταλυτικού συστήματος με βάση το χαλκό, για την αναμόρφωση της μεθανόλης. Για το σκοπό αυτό εξετάστηκαν οι καταλυτικές ιδιότητες τριών συστημάτων βασιζόμενων σε καταλύτες χαλκού και παρασκευασμένων με τη μη συμβατική μέθοδο της καύσης: CuO-CeO2, τροποποιημένων καταλυτών CuO-CeO2 και Cu-Mn-O για την προαναφερθείσα διεργασία, καθώς και τα βέλτιστα δείγματα των καταλυτών CuO-CeO2 και Cu-Mn-O υποστηριγμένων σε μεταλλικούς αφρούς Al. Τα φυσικοχημικά χαρακτηριστικά των καταλυτών CuO-CeO2, βρέθηκαν να εξαρτώνται από τις

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15

DEMET, ATIF EMRE. "Biomass Valorization for the Production of Value-Added Chemicals and Bio-Fuels." Doctoral thesis, 2017. http://hdl.handle.net/11570/3107055.

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Due serie di catalizzatori a base di ossidi misti con composizione nominale M13-xM2xO4 sono stati sintetizzati con metalli non nobili, in cui M1=Co e M2=Fe o M1=Cu e M2=Mn, con il metodo della co-precipitazione. Ogni serie è composta da 5 catalizzatori con rapporti tra i cationi pari a M2/(M1+M2) 0.00, 0.33, 0.50, 0.67, 1.00. I catalizzatori sono stati caratterizzati attraverso tecniche XRD, EDX, fisisorbimento di N2, FT-IR, UV-VIS, TEM e TPR, e successivamente testati nelle reazioni di ossidazione del 5-idrossimetilfurfurale (HMF) derivante da biomasse a diversi intermedi ad elevato valore a

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16

Gupta, Shalabh. "Structural,magnetic and transport properties of some polar intermetallics (stannides and antimonides) and silver,copper based quaternary thio- spinels." Thesis, 2007. http://localhost:8080/iit/handle/2074/3655.

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