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Dissertations / Theses on the topic 'Tungsten bit'

Author: Grafiati

Published: 4 June 2025

Last updated: 8 July 2025

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1

Holmberg, Anders. "Wear and degradation of rock drill buttons with alternative binder phase in granite and sandstone." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-312141.

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In this thesis, drill bit buttons with cobalt, nickel and iron binders in different compositions have been tested against granite and sandstone and the wear and friction have been measured. Furthermore, the wear and degradation of the buttons have been categorized. Buttons with cobalt binder were tested against granite and sandstone and buttons with alternative binders (Ni, Fe, Co) were tested against granite. Cobalt buttons were used as a reference and the wear and friction of the alternative binders was compared to the reference. The amount of worn rock was also measured. Furthermore, post treated drill bit buttons with a composition of Fe-Ni-Co were compared to buttons with the same composition that had not been post treated The results show that buttons with an alternative composition of Fe-Co-Ni and Fe- Ni wears less than the cobalt reference. The post treatment process does not decrease the wear of the drill bit but lowers the deviation from the mean wear. The amount of worn rock does not differ between the samples except for between the post treated and not post treated buttons with a composition of Fe-Ni-Co. The post treated buttons produces more rock debris than the not post treated. No apparent difference could be seen on the surface of the tested buttons after the test. However, composition specific cracks could be found underneath the surface of the samples. EDS-analysis showed signals of oxygen inside of all of the investigated cracks. For some compositions at depths of 20 micrometers. The curves of friction shows similar appearance but the values of the coefficient of friction differs. No apparent correlation was found between the wear and friction of the samples. Furthermore, no apparent correlation was found between the hardness and the wear of the buttons.

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2

Marou, Alzouma Ousseini. "Durabilité tribologique de matériaux pour insert de dents de tunnelier." Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0042.

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La fréquence des opérations de maintenance lors de l’excavation du sol par les tunneliers est problématique pour les entreprises de travaux publics. Ces opérations de maintenance engendrent des temps morts onéreux et nécessitent l'intervention d'opérateurs dans des conditions de travail hyperbares. Une des raisons aux nombreuses interventions humaines pour la maintenance est l’endommagement des outils racleurs du sol excavé (dents) qui sont placés sur la tête du tunnelier. Ces outils sont sujets à l’usure compte tenu de l’abrasivité des différents milieux qu’ils rencontrent. Le but de cette thèse est de contribuer à augmenter d’au moins 20% la durée de vie des matériaux constitutifs de ces outils, afin de réduire les différentes opérations de maintenance qui exposent les opérateurs à des risques importants. Pour atteindre cet objectif, les investigations menées dans ce travail ont porté sur plusieurs axes. Dans un premier temps, une expertise est menée pour identifier les modes d’endommagement prédominants sur les inserts à base de carbure de tungstène placés sur les dents ; ensuite, de nouveaux matériaux avec des propriétés mécaniques et des microstructures optimisées, développés dans le cadre du projet européen NeTTUN, sont caractérisés sur des bancs d’essais représentatifs. Ces essais ont permis de bien comprendre les mécanismes d’usure des nouveaux matériaux à base de carbure de tungstène. Les résultats de ce travail peuvent ensuite donner lieu à de nouvelles orientations en matière de choix de matériaux pour renforcer les dents de tunnelier<br>The frequency of maintenance operations during the excavation of the ground by the tunnel boring machines (TBM) is problematic for civil engineering companies. These maintenance operations provoke expensive timeouts and they bring in excavation operators in risky hyperbaric work conditions. One of the reasons which leads to the numerous human interventions for the maintenance is the damage of drag bits located on the cutting wheel of the TBM. These drag bits undergo wear due to the abrasiveness of the various media they meet. The purpose of this thesis is to contribute to increase by 20 % at least the lifetime of the materials of the dag bits, in order to reduce the various maintenance operations which expose the operators to important risks. To achieve this goal, the investigations led in this work concerned several axes. At first, an expertise is led to identify the wear modes prevailing on the carbide inserts located on the drag bits; then, new materials with enhanced mechanical properties and optimized microstructures, developed in the framework of the European project NeTTUN, are characterized on representative lab testing devices. These tests allowed us to understand well the wear mechanisms of the newly developed grades of tungsten carbides. The results of this work can lead to new strategies for the selection of materials to reinforce the drag bits

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3

Корнута, В. А. "Удосконалення конструкції шарошок та озброєння бурових доліт з урахуванням їх напруженого стану". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2011. http://elar.nung.edu.ua/handle/123456789/1939.

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Дисертацію присвячено вирішенню науково-прикладного завдання підвищення надійності озброєння бурових шарошкових доліт шляхом удосконалення конструкції закріплення вставних твердосплавних зубців в корпусі шарошки за результатами моделювання напруженого стану з'єднання з натягом. Розглянуто відомі уявлення про роботу з’єднань з натягом. На підставі аналізу результатів досліджень роботи з’єднань з натягом у машинобудуванні та їх порівняння з інформацією про роботу з’єднань “зубець-шарошка” запропоновано нову конструкцію з'єднання “зубець-шарошка”, отримано патент. Набула подальшого розвитку аналітична модель напружено-деформованого стану з’єднання з натягом співвісних багатокомпонентних циліндрів із суцільним внутрішнім циліндром - змінено крайові умови моделі. Поставлено та вирішено задачу оптимізації дво- та трикомпонентного з’єднання з натягом за критерієм максимуму несучої здатності щодо осьової сили. Удосконалено метод оцінки впливу способів складання та геометричних параметрів елементів конструкції з’єднання з натягом “зубець-шарошка” з наближеною до реальної геометрією на напружено-деформований стан деталей з’єднання за допомогою використання числового методу розрахунку параметрів моделі. Розроблено методику інженерного проектування оптимізованих конструкцій.

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4

Carmichael, Adrian John. "Synthesis of cationic bis(cyclopentadienyl)tungsten(IV) complexes." Thesis, University of Warwick, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245955.

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5

Dryden, Neil H. "Chemistry of bis(alkyl) nitrosyl and related complexes of molybdenum and tungsten." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30694.

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The reactions of (ɳ⁵-C₅R₅)M(NO)(CO)₂ (R = H, Me; M = Mo, W) with PCl₅ result in the formation of the corresponding (ɳ⁵-C₅R₅)M(NO)(Cl)₂ products in high isolated yields (85-95%). These products have been fully characterized by conventional analytical and spectroscopic techniques including an X-ray crystallographic study of [ɳ⁵-C₅Me₅)Mo(NO)(Cl)₂]₂. Alkylation of the (ɳ⁵-C₅R₅)W(NO)(Cl)₂ compounds with Grignard reagents results in the formation of the corresponding complexes, (ɳ⁵-C₅R₅)W(NO)(R')₂ (R = H, Me; R' = CH₂CM₃, CH₂CM₂Ph: R = Me; R' = p-C₆H₄Me, Ph). An electrochemical study of (ɳ⁵-C₅H₅)W(NO)(CH₂CMe₃)₂, (ɳ⁵-C₅H₅)W(NO)(CH₂CMe₂Ph)₂, and (ɳ⁵-C₅Me₅)W(NO)(p-C₆H₄Me)₂ shows 2 successive, chemically reversible, one electron reductions in THF for each complex. The complexes (ɳ⁵-C₅R₅)W(NO)(R')₂ (R = H; R' = CH₂CMe₃, CH₂CMe₂Ph: R = Me; R' = CH₂CMe₂Ph,p-C₆H₄Me) react with 1 atm of CO resulting in the formation of the singly inserted products (ɳ⁵-C₅R₅)W(NO){C(O)R'}(R') in good yields, presumably via initial CO coordination. These acyl complexes have been completely characterized by conventional techniques. The IR and NMR spectroscopic properties of these complexes are indicative of an ɳ²-acyl coordination mode for all of the acylalkyl and acylaryl products. Under 6 atm of CO the (ɳ⁵-C₅H₅)W(NO)(R')₂ (R' = CH₂CMe₃, CH₂CM₂Ph) complexes are doubly carbonylated to form the corresponding (ɳ⁵-C₅H₅)W(NO){C(O)R'}₂ products. Furthermore, (ɳ⁵-C₅Me₅)W(NO){C(O)p-C₆H₄Me}(p-C₆H₄Me) reacts to form (ɳ⁵-C₅Me₅)W(NO)(CO){C(O)p-C₆H₄Me}(p-C₆H₄Me) under 6 atm of CO, but there is no evidence for the formation of a bis(acyl) product. A preliminary X-ray crystallographic investigation of (ɳ⁵-C₅H₅)W(NO){C(O)CH₂CMe₂Ph}₂ reveals the presence of one ɳ²-acyl ligand and one ɳ¹acyl ligand. The ¹H and ¹³C{¹H} NMR spectra of the (ɳ⁵-C₅H₅)W(NO){C(O)R'}₂ compounds exhibit signals for only one type of acyl ligand, indicating that the complexes are stereochemically non-rigid in solution through a process which averages the signals for the ɳ¹and ɳ³- acyl ligands. The bis(benzyl) complexes, (ɳ⁵-C₅R₅)M(NO)(CH₂Ar)₂ (R = H, Me; M = Mo, W; Ar = Ph, p-Tol), react with HCl to form (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ar)(Cl) complexes. These complexes have been reacted with Grignard reagents, R'MgCl, to form the corresponding (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ar)(R') (R' = CH₂SiMe₃, CH₂CMe₃, p-Tol) products. The benzyl ligand in all of these complexes is coordinated in an ɳ²-fashion, similar to that seen in the solid-state molecular structures of the bis(benzyl) precursors. The coordination mode of the benzyl ligands has been confirmed by solid-state molecular structure determinations of the representative examples (ɳ⁵-C₅Me₅)Mo(NO)(CH₂Ph)(Cl) and (ɳ⁵-C₅Me₅)Mo(NO)(CH₂Ph)(CH₂SiMe₃). The ¹H and ¹³C{¹H} NMR spectroscopic data for all of the complexes are discussed, with focus on the diagnostic characteristics for the ɳ²-benzyl ligand. A possible qualitative interpretation for the symmetric ɳ²-bonding mode in these complexes is presented. The (ɳ⁵-C₅Me₅)M(NO)( ɳ²-CH₂Ph)(Cl) (M = Mo, W) complexes react with AgBF₄ in CH₃CN to form electrophilic complexes of the type [(ɳ⁵-C₅Me₅)M(NO)( ɳ²-CH₂Ph)(NCCH₃)]BF₄. The solid-state molecular structures of these complexes are discussed and contrasted with those found for the neutral ɳ²-benzyl complexes. The reaction of racemic AgO₂CCH(Et)(Ph) with the (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ph)(Cl) (R = H, Me; M = Mo, W: R = H; M = Mo) compounds forms the corresponding diastereomeric (ɳ⁵-C₅R₅)M(NO)( ɳ¹-CH₂Ph)(O₂CCH(Et)(Ph)) products. The ɳ¹ coordination of the benzyl ligand and bidentate coordination of the carboxylate ligand are established by the IR, ¹H, and ¹³C{¹H} NMR spectroscopic data for these products. A mixture of two diasteromeric products is demonstrated by the ¹H and ¹³C{¹H} NMR spectroscopic data and initial attempts to separate these diastereomers by crystallization are described.<br>Science, Faculty of<br>Chemistry, Department of<br>Graduate

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6

洪昆權 and Kunquan Hong. "Synthesis of one-dimensional tungsten oxide nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B39558551.

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7

Hu, Rong, and 胡蓉. "Synthesis and characterization of tungsten oxide nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41508774.

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8

Whalley, Alexandra L. "The synthesis and characterisation of bis(cyclopentadienyl) molybdenum and tungsten dithiolene complexes." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324486.

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9

Yiu, Wing-ching James, and 姚穎貞. "Synthesis of one-dimensional tungsten oxide nano-structures by thermalevaporation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B32047770.

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10

Hartmaier, Alexander. "Modeling of crack-tip plasticity in Tungsten single crystals." [S.l. : s.n.], 2000. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9444852.

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11

Bui, Phuong Phuc Nam. "Catalytic Hydrodeoxygenation of Bio-Oil Model Compounds (Ethanol, 2-Methyltetrahydrofuran) over Supported Transition Metal Phosphides." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/52641.

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The objective of this project is to investigate hydrodeoxygenation (HDO), a crucial step in the treatment of bio-oil, on transition metal phosphide catalysts. The study focuses on reactions of simple oxygenated compounds present in bio-oil -- ethanol and 2-methyltetrahydrofuran (2-MTHF). The findings from this project provide fundamental knowledge towards the hydrodeoxygenation of more complex bio-oil compounds. Ultimately, the knowledge contributes to the design of optimum catalysts for upgrading bio-oil. A series of transition metal phosphides was prepared and tested; however, the focus was on Ni2P/SiO2. Characterization techniques such as X-ray diffraction (XRD), temperature-programmed reduction and desorption (TPR and TPD), X-ray photoelectron spectroscopy (XPS), and chemisorption were used. In situ Fourier transform infrared (FTIR) spectroscopy was employed to monitor the surface of Ni2P during various experiments such as: CO and pyridine adsorption and transient state of ethanol and 2-MTHF reactions. The use of these techniques allowed for a better understanding of the role of the catalyst during deoxygenation.<br>Ph. D.

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12

Saleem, Swilem. "Electrical conductivity measurements of strongly coupled tungsten, titanium and silver plasmas." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96361262X.

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13

Fortune, Kevin Martin. "Nitrogen donor complexes of molybdenum and tungsten and new routes to BIS-1,2 & TRIS-1,2,3 substituted ferrocenes." Thesis, Bangor University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409440.

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14

Arumugam, Nachiappan. "New ternary alkali oxides and quaternary alkali oxy-nitrides of molybdenum and tungsten." [S.l. : s.n.], 2005. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB12103661.

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15

Schmitt, Rainer. "P-H-functionalized phosphenium tungsten complexes exchange reactions at the phosphorus and cycloadditions with heteroallenes /." Doctoral thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979464242.

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16

Niessen, Holger. "Structural aspects of molybdenum transhydroxylase from Pelobacter acidigallici and tungsten acetylene hydratase from Pelobacter acetylenicus." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97135684X.

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17

Ercan, Bayram. "Substitution Kinetics Of The Pentacarbonylbis(trimethylsilyl)ethynetungsten(0) With Triphenylbismuthine." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/12604980/index.pdf.

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The reaction between pentacarbonylbis(trimethylsilyl)ethynetungsten(0), W(CO)5(&amp<br>#951<br>2-btmse), and triphenylbismuthine, Bi&Oslash<br>3, yields pentacarbonyltriphenylbismuthinetungsten(0), W(CO)5(Bi&Oslash<br>3), as the sole product. The kinetics of the substitution of btmse by Bi&Oslash<br>3 was studied by means of quantitative FT-IR Spectroscopy. The starting complex was prepared photochemically from hexacarbonyltungsten, W(CO)6, in the presence of excess btmse in n-hexane and identified by FT-IR and NMR Spectroscopies. The substitution reactions were performed in cyclohexane solutions at different concentrations of both leaving and entering ligand to observe the dependence of observed rate constant, kobs, on the concentration of entering and leaving ligands and also, at different temperatures to evaluate the activation enthalpy (&amp<br>#8710<br>H&amp<br>#8800<br>) and the activation entropy (&amp<br>#8710<br>S&amp<br>#8800<br>). The IR extinction coefficients for CO stretching were determined for both the starting complex W(CO)5(&amp<br>#951<br>2-btmse), and the product W(CO)5(Bi&Oslash<br>3). Quantitative IR Spectroscopy does not show any significant reduction in the total amount of substance (material balance). Formation of W(CO)6 (in small amount) was attributed to the decomposition of the product, W(CO)5Bi&Oslash<br>3. From the evaluation of kinetic data, a mechanism was proposed in which the rate determining step is the cleavage of btmse ligand from the starting complex, W(CO)5(&amp<br>#951<br>2-btmse) and the formation of solvated complex, W(CO)5(solvent). Thus, the reaction is essentially dissociative. The large positive value of activation entropy (&amp<br>#8710<br>S&amp<br>#8800<br>) and large value of activation enthalpy (&amp<br>#8710<br>H&amp<br>#8800<br>) are indicative of a dissociative mechanism.

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18

Yu, Yan [Verfasser], та Peter [Akademischer Betreuer] Burger. "Synthetic, Structural, Spectroscopic and Electrochemical Studies of Dinuclear bis μ-Oxo-Bridged Molybdenum(IV) and Tungsten(IV) Half-Sandwich Complexes / Yan Yu. Betreuer: Peter Burger". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2014. http://d-nb.info/1052996701/34.

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19

Abt, Dietmar. "Tungsten-acetylene hydratase from Pelobacter acetylenicus and molybdenum-transhydroxylase from Pelobacter acidigallici two novel molybdopterin and iron-sulfur containing enzymes /." [S.l. : s.n.], 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9683814.

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20

Dey, Kalpana Rani. "Synthesis and characterisation of alkali metal tungsten bronzes, LixWO3 and MxM'yW1-yO3 (M'=Li, Na, Cs and M'=Nb, Mo) systems." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974134120.

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21

Hsu, Shih-Yu, and 許時毓. "Structure, Properties and Fluxional Behavior of bis(alkene) Complexes of Tungsten." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/64101804418591102847.

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22

Xu, Shi-Yu, and 許時毓. "Structure, Properties and Fluxional Behavior of bis(alkene) Complexes of Tungsten." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/68724180217450008033.

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23

"SYNTHESIS AND CHARACTERIZATION OF CARBONYL - TUNGSTEN(0) COMPLEXES OF [N,N'-BIS(FERROCENYLMETHYLENE)ETHYLENEDIAMINE]." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606101/index.pdf.

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24

Chen, Yen-Chun, and 陳彥君. "A Proposed Mechanism of WS2 Formation by Atomic Layer Deposition Using Bis(tert-butylimino)bis(dimethylamino)tungsten and H2S." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/wvdprk.

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25

Morton, Laurel Anne. "Tungsten alkyl alkylidyne and bis(alkylidene) complexes their unusual inter-conversion and reactions with phosphines, dioxygen and water /." 2005. http://etd.utk.edu/2005/MortonLaurel.pdf.

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Thesis (Ph. D.)--University of Tennessee, Knoxville, 2005.<br>Title from title page screen (September 6, 2005). Thesis advisor: Ziling (Ben) Xue. Document formatted into pages (xxiii, 182 p. : ill. (some col.)). Vita. Includes bibliographical references (p. 135-145).

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26

Zhang, Qingwei. "New synthetic pathways to mono- and bis-dithiolene compounds of molybdenum and tungsten related to the active sites of the molybdopterin containing oxidases." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-AC98-D.

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27

Zhang, Qingwei [Verfasser]. "New synthetic pathways to mono- and bis-dithiolene compounds of molybdenum and tungsten related to the active sites of the molybdopterin containing oxidases / vorgelegt von Qingwei Zhang." 2007. http://d-nb.info/986869821/34.

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28

Benaboud, R. "Etude thermodynamique et élaboration de dépôts métalliques (W-N-C, Ti-N-C) par PEALD (Plasma Enhanced Atomic Layer Deposition) pour la réalisation d'électrodes de capacités Métal/Isolant/Métal dans les circuits intégrés." Phd thesis, 2009. http://tel.archives-ouvertes.fr/tel-00441093.

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Les capacités MIM (Métal/Isolant/Métal), au coeur de cette étude, sont des composants intégrés entre les niveaux d'interconnections. Le développement de nouvelle architecture en trois dimensions impose de déposer les films ultraminces constituant la capacité MIM de manière très conforme. Ce qui conduit à utiliser un nouveau procédé de dépôt : la méthode ALD assistée par plasma ou PEALD. De plus l'augmentation des performances électriques des MIM passe par une maîtrise des propriétés des électrodes et des interfaces créées entre le diélectrique et les électrodes métalliques. Les matériaux développés dans cette étude sont Ti- N-C and W-N- C, déposés par PEALD à partir de précurseurs organométalliques TDMAT et BTBMW. Une étude sur les propriétés physico-chimiques et électriques des films est effectuée ainsi que l'intégration de ces films dans les capacités MIM.

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