Дисертації з теми "Copper free"
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Mahale, Vishal Tulshiram. "Development of copper-free NAO brake-pads." Thesis, IIT Delhi, 2019. http://eprint.iitd.ac.in:80//handle/2074/8058.
Повний текст джерелаGeorge, Faith Olajumoke. "Chromium-free conversion coating of aluminium-copper alloys." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/chromiumfree-conversion-coating-of-aluminiumcopper-alloys(5176c8af-02af-44a8-a47f-44b5a0c2585c).html.
Повний текст джерелаLee, Lin. "Contribution to Development of Copper Free Automotive Brake Pad." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/theses/1244.
Повний текст джерелаSaysell, Colin G. "Reactivity of the copper containing enzyme galactose oxidase." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307890.
Повний текст джерелаLandeen, Lee Kevin 1965. "Inactivation of Legionella pneumophila by copper-silver ions and free chlorine." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276997.
Повний текст джерелаChiou, Ipeng 1957. "Inactivation of Listeria monocytogenes by copper, silver ions and free chlorine." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/277992.
Повний текст джерелаStarnes, Hazel Louise. "The role of copper in the free radical depolymerisation of hyaluronic acid." Thesis, University of Salford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308285.
Повний текст джерелаBaga, Ayad Naji Omar. "Reactions of some copper complexes with hydrogen peroxide and radiation-produced free radicals." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328136.
Повний текст джерелаAnson, Scott J. "Analysis of lead free tin-silver-copper and tin-lead solder wetting reactions." Diss., Online access via UMI:, 2007.
Знайти повний текст джерелаFreiholtz, Oliver. "Corrosion behaviour of new lead-free brass alloys in aqueous copper (II) chloride." Thesis, KTH, Kemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299780.
Повний текст джерелаDue to new regulations for the use of brass in contact with drinking water, new lead-free brass alloys have been developed. It is therefore of great interest to investigate their corrosion properties in terms of dezincification resistance. An accelerated standard test, SS-EN ISO 6509-1:2014 is used to determine the dezincification resistance of brass alloys. However, as this standard test was developed for leaded brass alloys, it has not yet been established whether this method also is suitable to assess the dezincification resistance of lead-free brass alloys. This master thesis study aimed to expand this knowledge gap by investigating how the dezincification properties of three different brass alloys, two newly developed lead-free alloys and one lead-containing alloy, were affected by changing the parameters of the standard test. The results were compared with their behaviour in tap water to determine the reliability of the ISO test. Most of the obtained results of the lead-free brass alloys were in accordance with the results obtained for the leaded brass alloy. It could therefore be concluded that the standard test can be used to assess the dezincification resistance of brass alloys and also reflect their ranking at tap water conditions.
Fabre, Indira. "Experimental and theoretical mechanistic studies of transition-metal free and copper-catalyzed reactions." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE033/document.
Повний текст джерелаIn this thesis, synthetic methodology development and mechanistic studies are presented. A complementary approach, using both experiments and theoretical outcomes from DFT, is used. Three reactions were studied. The first reaction is the transition-metal free alpha-arylation of enolizable ketones. It proceeds using DMF and tBuOK. The mechanistic study reveals the formation of an electron-rich species by deprotonation of the solvent. The second reaction studied is the copper-catalyzed N-arylation of pyrazoles with arenediazonium salts generated in situ. A benchmark is performed to evaluate the best DFT methodology. A double catalytic cycle is proposed, involving copper and acetic acid. The last reaction studied is the copper-catalyzed stereoselective access to trisubstituted fluorinated alkenyl thioethers. The development of the methodology is presented. Then a mechanistic study reveals a radical mechanism that can be generalized to other substrates
Wang, Dong. "Making dimers of light-harvesting complexes from purple bacteria using copper–free click chemistry." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0062/document.
Повний текст джерелаThe light harvesting apparatus of photosynthetic bacteria absorb the energy from sunlight and transfer the energy with high efficiency to the reaction center, where it is captured for use by the cell. We know little about the details of energy transfer between different light-harvesting complexes. In this thesis I isolated several different types of light-harvesting complex from various stains of purple bacteria. 3D models were built, based on homology modeling, and possible dimer structures were examined. The cross linking sites in these protein shown the possiblity of forming biologically relevant dimer structures. I have developed a protocol to make dimers, from highly oligomeric light harvesting proteins. The protocol developed contains three main steps: first reaction of lysines in the complex at a very low degrees of reaction and purifying the labelled protein. Then coupling the reactive groups of dibenzylcyclootyne (DBCO) or of azide separately to the different complexes. Finally, the copper free strain promoted azide-alkyne cycloaddition reaction occurred to synthesize the dimer
Alawadhi, Meshal Y. "Microstructural evolution and mechanical properties of oxygen-free copper processed by severe plastic deformation." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/415750/.
Повний текст джерелаLee, Poh Wah. "DESIGN AND OPTIMIZATION OF LOW-Cu AND Cu-FREE AUTOMOTIVE BRAKE FRICTION MATERIALS." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/dissertations/724.
Повний текст джерелаNoren, Martin. "Electroless Copper Plating to Achieve Solderless Connections." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86533.
Повний текст джерелаKostova, Vesela. "Shiga toxin targeted strategy for chemotherapy and cancer immunotherapy application using copper-free « Click » chemistry." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCB144.
Повний текст джерелаRecently targeted therapies appeared as attractive alternatives to classical antitumoral treatments. The approach, developed on the concept of targeting drug to cancer cells, aims to spear normal tissues and decrease the side effects. This doctoral dissertation focuses on developing new anticancer targeted treatments in the field of chemotherapy and cancer immunotherapy by exploiting an original targeting moiety, the B subunit of Shiga toxin (STxB). Its specific properties, such as, recognition with its receptor Gb3 overexpressed in cancer cells or in antigen-presenting cells, its unconventional intracellular trafficking, guided the choice of this protein as targeting carrier. This project is based in the use of copper-free Huisgen [3+2] cycloaddition as a coupling method, which led to successful preparation of various conjugates for their respective applications. The concept was first validated by STxB-biotin conjugate. The high yield of the reaction and the compatibility between the targeting carrier and the chemical ligation promoted the design of conjugates for chemotherapy and immunotherapy. Two therapeutical optimizations of previously developed strategy in STxB drug targeting delivery were investigated: synthesis of multivalent drug-conjugates and synthesis of conjugates containing a highly potent anticancer agent. Both approaches exploited three anticancer agents: SN38, Doxorubicin and Monomethyl auristatin F. The disulfide spacer, combined with various self-immolative systems, insured drug release. Two cytotoxic conjugates STxB–doxorubicin (STxB-Doxo) and STxB-monomethyl auristatin F (STxB-MMAF) were obtained in very high yield and demonstrated strong tumor inhibition activity in the nanomolar range on Gb3-positive cells. Based on the results the STxB-MMAF conjugate was investigated on a mouse model. The project aimed also to develop STxB bioconjugates for vaccine applications. Previous studies used B subunit as a targeting carrier coupled to an antigenic protein in order to induce a more potent immune response against cancer. The conjugates were prepared using a commercial linker, requiring modifying the antigen at first place, or by oxime ligation, where slightly acidic conditions promoted the coupling. Thus, the work presented herein proposed an alternative ligation via copper-free click chemistry especially for more sensitive antigenic proteins. Various types of conjugates were synthesised and investigated for their immune stimulation properties. The STxB targeting strategy was also applied to the development of a new vaccine based on coupling the targeting carrier to alpha-GalCer, one of the most potent immune stimulating agents known. The work focused on the synthesis of functionalised alpha-Galcer with an azide handle
Wang, Huifeng. "Molecular Mass Dependent Mechanical Properties of Metal-free Click Hydrogels." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1427901118.
Повний текст джерелаPatel, Rakesh P. "Mechanisms of haemoglobin or copper ion promoted lipid peroxidation : implications for the oxidative modification of low density lipoprotein." Thesis, University of Essex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337178.
Повний текст джерелаZhanbotin, A. Zh, A. S. Yessenbekov, M. M. Saifulin, and V. V. Saiko. "Field Emission from an Array of Free-standing Copper Nanowires Grown in PET Ion-track Membranes." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35319.
Повний текст джерелаLiggett, Jennifer. "Microelectrode Investigation of Iron and Copper Surfaces Exposed to Free Chlorine Under Relevant Drinking Water Chemistries." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439562284.
Повний текст джерелаKanungo, Biraja Prasad. "Variation of free volume with deformation and relaxation for copper- and zirconium based bulk metallic glasses." Connect to this title online, 2004. http://www.ohiolink.edu/etd/view.cgi?osu1092922080.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xiii, 115 p. ; also includes graphics (some col.). Includes bibliographical references (leaves 104-113). Available online via OhioLINK's ETD Center.
Nalagatla, Dinesh Reddy. "INFLUENCE OF SURFACE ROUGHNESS OF COPPER SUBSTRATE ON WETTING BEHAVIOR OF MOLTEN SOLDER ALLOYS." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/488.
Повний текст джерелаKim, Yeong Ho. "Chromium-free consumable for welding stainless steel corrosion perspective /." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133285376.
Повний текст джерелаSaadalla-Nazhat, R. A. S. "Reactions of radiation-produced free radicals with copper-amino acid complexes and related compounds in aqueous solution." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378870.
Повний текст джерелаGupta, Shweta. "The Constitutive Behavior of Copper at High Strain Rate as Determined by the Free Expansion Ring Test." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366200117.
Повний текст джерелаMonahan, Bradley Michael. "Synthesis and Characterization of Phase-pure Copper Zinc Tin Sulfide (Cu2ZnSnS4) Nanoparticles." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1404732007.
Повний текст джерелаDubey, Brajesh Kumar. "Comparison of environmental impacts of wood treated with chromated copper arsenate (CCA)and three different arsenic-free preservatives." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013092.
Повний текст джерелаSauvé, Sébastien. "Copper and aluminum free ion activity in soil solutions = L'activité inonique du cuivre et de l'aluminium dans des solutions de sols." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23295.
Повний текст джерелаThe second method is a simple determination of free Cu$ sp{2+}$ in soils using a cupric ion-selective electrode. Free copper has been demonstrated to be the toxicity controlling component in aquatic studies and this study was undertaken to measure free copper activity in soils. The possible interference due to ionic strength variations or the presence of aluminum in the soil solution was checked and found to be negligible. The free activity of copper (pCu$ sp{2+}$) measured in a variety of pristine and contaminated soils varied between 6.33 to 12.20 pCu$ sp{2+}$ units. Total soil copper content and acidity were shown to strongly increase copper solubility and free Cu$ sp{2+}$ activity in the soil solution extracts. (Abstract shortened by UMI.)
De, Castro Eloisa M. "Tuning and parameter optimization of a digital integral controller for uniform droplet spray applications using lead-free tin-copper solder." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54543.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 21).
The advent of legislation restricting the use of lead in electronics requires innovation and refinement in processes for creating lead-free solder spheres for wafer bumping and other surface mount technology. Operation improvements were made upon a uniform droplet spray apparatus, and its digital integral controller was tuned for application to lead-free solder. Parameters determined included a range of initial controller command frequencies that would produce a stable image given a desired droplet diameter, and the value of the controller gain. The frequency range was determined by measuring the diameters of droplets attained at certain frequencies. The controller gain was optimized by measuring the time it took for the controller to reach its steady state at different gain values. It was determined that initial command frequency should be within ±150 Hz of that corresponding to the target diameter and an integral gain of 0.1 dB is the optimal gain for the tin-copper lead-free solder alloy, performing at par with the system specifications when in use with lead-bearing solder.
by Eloisa M. de Castro.
S.B.
Scarazzato, Tatiana. "Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-12032018-145732/.
Повний текст джерелаOs dois banhos de cobre comerciais mais comuns são o banho ácido à base de sulfato e o banho alcalino à base de cianeto. Os banhos alcalinos são usados principalmente para recobrir peças com geometria complexa e para evitar a deposição por deslocamento galvânico quando se deposita um metal em um substrato menos nobre. Por causa da toxicidade dos compostos cianídricos, banhos alternativos vêm sendo desenvolvidos usando diferentes agentes complexantes. O ponto de partida do presente estudo é um banho toque isento de cianeto para deposição de cobre em substratos de Zamak, desenvolvido pelo Instituto de Pesquisas Tecnológicas / Brasil. A substituição de matérias-primas como o cianeto deve ser economicamente vantajosa e tecnicamente viável. Desta forma, este estudo pretendeu propor uma alternativa para o tratamento de resíduos líquidos do banho mencionado, visando à recuperação simultânea da água e das matérias-primas em um sistema fechado. Foi estudado o processo de separação por membranas de eletrodiálise, usando um sistema em escala laboratorial operando com uma solução sintética que simulava as águas de lavagem do banho à base de HEDP. A viabilidade da técnica foi avaliada por meio da análise de parâmetros operacionais, como a extração dos íons, a taxa de dessalinização, o percentual de concentração, a eficiência de corrente calculada para cada espécie iônica e o consumo médio de energia. Devido ao HEDP ser um agente quelante, o transporte de quelatos Cu(II)-HEDP através de membranas aniônicas foi avaliado por meio de métodos eletroquímicos. Curvas cronopotenciométricas e curvas corrente-potencial foram construídas para diferentes soluções sintéticas que continham os mesmos compostos que o banho original. A relação entre a presença de quelatos nas soluções e os grupos fixos de troca iônica pôde ser estabelecida. Por fim, testes de deposição foram realizados usando eletrólitos contendo os compostos reciclados e as características dos depósitos foram analisadas. Os resultados mostraram que o sistema de eletrodiálise usando membranas aniônicas contendo grupos de troca fortemente básicos pôde produzir soluções tratadas e um concentrado contendo os íons do banho. O concentrado pôde ser adicionado ao banho original para compensar eventuais perdas por arraste sem afetar a qualidade dos depósitos. Assim, a aplicação da eletrodiálise se mostrou uma alternativa viável para a recuperação de água e de insumos da solução avaliada, reduzindo a geração de efluentes e economizando recursos naturais.
Scarazzato, Tatiana. "Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/98502.
Повний текст джерелаThe two most common commercial copper baths are the acid sulfate copper bath and the alkaline cyanide copper bath. Alkaline copper baths are mostly used to coat parts with complex geometry and to avoid galvanic deposition when depositing a metal on a less noble substrate. Because of the toxicity of cyanide compounds, alternative baths have been developed using different complexing agents. The starting point of the present study is a cyanide free strike bath developed for copper plating on Zamak substrates developed by the Institute for Technological Research of the State of São Paulo/ Brazil. The replacement of a raw material such as cyanide must be economically advantageous and technically feasible. Therefore, this study intended to propose an alternative to the treatment of liquid wastes from the mentioned bath, aiming at simultaneous water reclamation and chemicals recovery in a closed system. The electrodialysis membrane separation process was studied, using a laboratory-scale system operating with a synthetic solution simulating the rinsing waters from the HEDP-based bath. The feasibility of the technique was evaluated by analyzing operational parameters such as ion extraction, demineralization rate, concentration rate, current efficiency for each anionic specie and average energy consumption. Because HEDP is a chelating agent, the transport of Cu(II) HEDP chelates through anion exchange membranes was also evaluated by means of electrochemical methods. Chronopotentiometric and current-voltage curves were constructed for different model solutions containing the same compounds as the original bath. A relation between the presence of chelates in the solutions and the fixed ion exchange group could be established. Lastly, deposition tests were performed using electrolytes containing the recycled inputs and the characteristics of the coatings were analyzed. The results showed that an electrodialysis stack using strongly basic anion exchange membranes was suitable to produce treated solutions and a concentrate containing the ions from the bath. The concentrate could be added to the copper bath to compensate eventual drag-out losses without affecting the quality of the coatings. Thus, the application of electrodialysis was shown to be a feasible alternative for recovering water and inputs from the evaluated solution, reducing the wastewater generation and saving natural resources.
Els dos banys de coure més utilitzats comercialment són el bany àcid a base de sulfat i el bany alcalí a base de cianur. Els banys alcalins són utilitzats principalment per a produir recobriments en peces amb geometria complexa i per a evitar la deposició galvànica quan es deposita un metall en un substrat menys noble. A causa de la toxicitat dels compostos de cianur, s'han desenrotllat banys alternatius usant diferents agents complexants. El punt de partida de la present investigació és un bany primari sense cianurs per a deposició de coure en substrats de Zamak desenrotllat en l'Institut d'Investigacions Tecnològiques de l'Estat de Sao Paulo / Brasil. La substitució de matèries primeres com el cianur ha de ser econòmicament avantatjosa i tècnicament viable. D'aquesta manera, la investigació presentada va pretendre proposar una alternativa per al tractament de residus líquids del bany ja mencionat amb la finalitat de recuperar de manera simultània l'aigua i les matèries primeres en un sistema tancat. S'ha estudiat el procés de separació per membranes d'intercanvi iònic, electrodiàlisi, usant un sistema en escala de laboratori i una dissolució sintètica que simulava les aigües residuals del bany a base d'HEDP. S'ha avaluat la viabilitat del sistema per mitjà de l'anàlisi dels paràmetres d'operació, com l'extracció d'ions, la taxa de desmineralització, el percentatge de concentració, l'eficiència de la intensitat calculada per a cada espècie i el consum mitjà d'energia. Pel fet que l'àcid HEDP és un agent quelant, s'ha avaluat el transport dels quelats Cu (II)-HEDP a través de membranes d'intercanvi d'anions per mitjà de mètodes electroquímics. S'han construït corbes cronopotenciomètriques i corbes intensitat-potencial per a diferents dissolucions sintètiques que contenien els mateixos compostos que el bany original. S'ha establit la relació entre la presència dels quelats en les dissolucions i els grups fixos d'intercanvi d'anions. Finalment, s'han realitzat les proves de deposició usant electròlits contenint els compostos reciclats i s'han avaluat les característiques dels depòsits obtinguts. Els resultats van indicar que el sistema d'electrodiàlisi usant membranes d'intercanvi d'anions amb grups d'intercanvi de base forta ha pogut produir dissolucions tractades i un concentrat que conté els ions del bany. S'ha pogut afegir el concentrat al bany original per a compensar eventuals perdudes de l'arrossegament sense afectar la qualitat dels depòsits. Per tant, l'aplicació de l'electrodiàlisi va demostrar ser una alternativa viable per a la recuperació de l'aigua i de les matèries primeres de la dissolució avaluada, reduint la generació de residus líquids i estalviant els recursos naturals.
Scarazzato, T. (2017). Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/98502
TESIS
Peterson, Rebecca Anne 1973. "Characterization and optimization of ordering in thin films of 2,3,9,10,16,17,23,24-oktakis((2-benzyloxy)ethoxy)phthalocyaninato copper and its metal free analogue." Thesis, The University of Arizona, 1998. http://hdl.handle.net/10150/278681.
Повний текст джерелаPalimkar, S. S. "Novel synthetic methodologies: ionic liquid promoted friedlander heteroannulation and palladium-catalyzed copper/ligand/solvent free carbon-carbon coupling with heterocyclization reactions." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2007. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2604.
Повний текст джерелаGuddehalli, Parameswarappa Sharavathi. "Bifunctional cyclooctynes in copper-free click chemistry for applications in radionuclide chemistry nd 4-Alkylpyridine derivatives in intramolecular dearomatization and heterocycle synthesis." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/2710.
Повний текст джерелаMagni, M. "COPPER AND RUTHENIUM COMPLEXES IN SENSITIZED SOLAR CELLS AND OPTOELECTRONICS." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/333099.
Повний текст джерелаDelaney, Nathan. "Copper Capitalism: The Making of a Transatlantic Market in Metals, 1870-1930." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1526067114476348.
Повний текст джерелаFrança, Mírian Cotrim. "Cloreto de cobre como novo catalisador na esterificação de ácidos graxos." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-24062013-163216/.
Повний текст джерелаFor an economically feasible and efficient production of esters is necessary to use catalysts in the esterification and transesterification reactions, which are reversible. It is necessary to shift the reaction equilibrium in the desired direction. In this work we developed a novel reaction to produce methyl and ethyl esters of long chain fatty acids using copper chloride as catalysts. To establish optimal reaction conditions, we studied three different mass ratios of FFAs palm (or soybean) / methanol (or ethanol) / catalyst. Employing the best reaction conditions, methyl and ethyl mono-esters were produced from free fatty acid of the soybean oil deodorization distillate (DDOS) as well as the corresponding refined soybean and palm oil. The methyl and ethyl esters were characterized by gas chromatography coupled to mass spectrometry (GC / MS) and proton nuclear magnetic resonance (1H NMR). It was observed that reactions using copper chloride as catalyst are faster with free fatty acids than with neutrals refined oils. Among these, free fatty acids of unsaturated chain react faster than the saturated ones. Regarding the alcohol employed, it was observed that the reactions in ethanol are faster than those performed in methanol, due to higher of solubility of the catalyst and feedstock lipid in ethanol. The reaction with methanol, in turn occurs more slowly, due to partial solubility of the reactants in the solvent that results in, instantaneous phases separation. The scale up of reaction at 80 and 160 times for both, anhydrous and hydrated catalyst, was successfully performed showing the feasibility of this novel process use in industrial scale. Thus, the use of copper chloride as the catalyst in the reaction of long chain free fatty acids constitutes a simple and practical methodology, being a feasible option for the production of long chain monoalkyl esters under mild conditions compared to methods already established and also used in industrial scale.
Wu, Hao. "Catalytic Enantioselective Formations of C–B, C–C and C–Si Bonds by Organic Molecules or Transition-Metal Complexes." Thesis, Boston College, 2015. http://hdl.handle.net/2345/bc-ir:104759.
Повний текст джерелаCatalytic enantioselective reactions are of great importance in synthetic organic chemistry. Thus, development of efficient, selective and easily accessible catalyst for various bond formations is the main task in our laboratories. First, we have developed the first broadly applicable enantioselective boryl conjugate addition reactions to a variety of α,β-unsaturated carbonyls, promoted by a chiral Lewis basic N-heterocyclic carbene. The valuable β-boryl carbonyls were further used in complex molecule syntheses. The mechanism of these C–B bond formations was studied in details. We have also developed a practical method for enantioselective addition of an allene unit to aryl-, heteroaryl- and alkyl-substituted Boc-aldimines. These efficient C–C bond formations, catalyzed by an aminophenol-derived boron-based catalyst, were further utilized in succinct syntheses of anisomycin and epi-cytoxazone. Finally, chiral NHC–Cu complexes were employed for site-, diastereo- and enantioselective silyl conjugate additions to acyclic and cyclic dienones and dienoates. The precious enantiomerically enriched allylsilane obtained can be converted into a ketone-aldol type product, which is difficult to access through alternative methods
Thesis (PhD) — Boston College, 2015
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Ryberg, Per. "Concerted or Stepwise? : β-Elimination, Nucleophilic Substitution, Copper Catalysed Aziridination and Ruthenium Catalysed Transfer Hydrogenation Studied by Kinetic Isotope Effects and Linear Free-Energy Relationships". Doctoral thesis, Uppsala universitet, Avdelningen för organisk kemi, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-2008.
Повний текст джерелаChen, Jianxian. "I. Chemoselective catalytic hydrogenation of Ã, ß-unsaturated aldehydes and ketones using soluble copper(I) hydrides, II. Free radical alkylation of titanium(III) allyl and propargyl complexes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0005/NQ39514.pdf.
Повний текст джерелаLopez, Gerald Gabriel. "The impact of interconnect process variations and size effects for gigascale integration." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31781.
Повний текст джерелаCommittee Chair: Jeffrey A. Davis; Committee Co-Chair: James D. Meindl; Committee Member: Azad J. Naeemi; Committee Member: Dennis W. Hess; Committee Member: George F. Riley; Committee Member: Linda S. Milor. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Sowards, Jeffrey William. "Development of a chromium-free consumable for joining stainless steel." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1237845645.
Повний текст джерелаKrantz-Frid, Madelene. "Ecotoxicological effects from three antifouling paints on the red macroalga Ceramium tenuicorne." Thesis, Södertörns högskola, Institutionen för livsvetenskaper, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-3070.
Повний текст джерелаZell, Joanna. "Glycolipid - and Lectin-Dependant Endocytosis studies by a chemical biology Approch." Thesis, Sorbonne Paris Cité, 2018. https://theses.md.univ-paris-diderot.fr/ZELL_Joanna_2_complete_20181116.pdf.
Повний текст джерелаCurrent biological techniques do not permit the functional reintroduction of long-chain glycosphingolipids (GSLs) into cells. We aim to develop molecular tools permitting cellular reconstitution of functional GSLs in a controlled manner, combining metabolic labelling of sphingolipids with copper-free click chemistry. Molecular tools are validated with the bacterial Shiga toxin, which gains entry to cells independently of the canonical intracellular clathrin machinery on binding to its GSL cell receptor, globotriaosylceramide (Gb3-Cer), through a recently described mechanism of endocytosis, termed GL-Lect (glycolipid-lectin). According to the GL-Lect hypothesis, cellular or pathogenic lectins drive the construction of endocytic pits by reorganising membrane lipids so as to favour the formation of narrow membrane curvature. The GSL reconstitution technique that is described here is applicable to the discovery of GSL binding partners in the study of GL-Lect mediated endocytosis
Moreno, Ruben Gregorio Moreno. "Estudos de lesão ao DNA promovida pela autoxidação de S(IV) na presença de complexos de Cu(III)/tetraglicina. Efeito sinérgico de Ni(II), Co(II) e Mn(II)." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-04062007-032229/.
Повний текст джерелаThe present work presents studies related to biomolecules damage (DNA and 2\'-deoxyguanosine) induced by Cu(III)/tetraglycine (Cu(III)/G4), oxysulfur radicals (SO3·-, SO4·-, SO5·-) and HSO5-, species generated during S(IV) autoxidation in the presence of Cu(II)/G4 or Cu(II) (absence of tetraglycine) and trace level of a second metal ion (Ni(II), Co(II) or Mn(II)). The formation of SO3·- and HO· radicals was detected by electronic paramagnetic resonance technique (EPR). Spectrophotometric and circular dichroism techniques were used to evaluate the Cu(III)/G4 formation in different experimental conditions, in the presence and the absence of S(IV), and the interaction of copper (II)/(III) complexes and DNA molecule. The effectiveness of Cu(III) formation depends on the acidity, S(IV) concentration, and buffers used. The damage on pUC 19 plasmid DNA was verified by agarose gel electrophoresis. The extent on the DNA damage was related to acidity, S(IV) concentration, incubation time and to the presence of a second metal ion. Using the high performance liquid chromatography technique (HPLC) it was possible to study the oxidation of 2\'-deoxyguanosine to 8-oxo-7,8-dihydro-2\'-deoxyguanosine in the presence of strong oxidants generated during the S(IV) autoxidation catalyzed by Cu(II)/G4. A comparative study of the effect of several metal ions showed the synergism of Cu(II) and traces of a second metal ion (Ni(II), Co(II) or Mn(II), as tetraglycine complexes or not).
Maza, Quiroga Ricardo José. "Nucleophilic boryl motifs and alpha-borylcarbanions: reactivity and trends." Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/673184.
Повний текст джерелаegioselectiva de Cu-B sobre C=C, seguida de una reacción intramolecular de adición de Cu-C sobre C=O. Los productos se han formado con diastereoselectividad y un análisis computacional ha identificado los puntos clave que determinan la quimio- y diastereoselectividad observada. En el Capítulo 3, es estudia la reactividad de los compuestos diborados con 1,3-dienos en un contexto libre de metales de transición. La única adición de Na2CO3 sobre bis(pinacolato)diboro, en MeOH, permite la 1,4-hidroboración de 1,3-dienos no cíclicos y cíclicos. La influencia electrónica del sustrato garantiza la hidroboración conjugada 1,4 versus la 1,2. Cálculos DFT muestran que la distribución de la carga en el anión alílico intermedio gobierna la selectividad en la reacción de 1,4-hidroboración, mientras que la configuración trans del dieno determina la preferencia por el producto alil-borilado E. En el capítulo 4, se estudia la química de los carbaniones alpha-borilados, ya que muestran una gran diversidad y permiten la formación de enlaces C-C eficientes. La deficiencia electrónica del centro borilado trisustituido es responsable de la estabilización del carbanión, facilitando su formación y modelando su reactividad. Se describen aspectos electrónicos de la estructura y tendencias reactivas de un conjunto amplio de alpha-boryl carbanions. Mediante estudios de DFT se ha determinado un mapa de tendencias sobre la reactividad nucleófila de los carbaniones alpha-borilados, variando la naturaleza del grupo borilo, el número de grupos borilo en el carbanión y la naturaleza del catión estabilizante. Este mapa de tendencias permite la selección del sintón apropiado, en función de la reactividad objeto de estudio.
In Chapter 2, copper (I) catalyzes the borylative cyclization of gamma-alkenyl aldehydes through chemo- and regioselective addition of Cu-B to C=C and concomitant intramolecular 1,2-addition of Cu-C on the C=O. The products are formed in an exclusive diastereoselective manner and computational analysis identify the key points for the chemo- and diastereoselectivity observed. In Chapter 3, we study the reactivity of diboron reagents with 1,3-dienes in a transition-metal-free context. The sole addition of Na2CO3 to bis(pinacolato)diboron, in MeOH, allows the 1,4-hydroboration of cyclic and noncyclic 1,3- dienes. The electronic influence on the substrate guarantees the conjugated 1,4-hydroboration versus 1,2-diboration. DFTcalculations show that the distribution of charge in the allylic anion intermediate governs the selectivity toward 1,4- hydroboration, while the favored trans configuration in diene reagents determines the preference for the E allyl boronate products. In Chapter 4, we studied the chemistry of alpha-boryl carbanions since they show a remarkable diversity, and enable efficient C-C bond formation. The electron-deficient, trivalent boron center stabilizes the carbanion facilitating its generation and tunning its reactivity. We describe the electronic structure and the reactivity trends of a large dataset of apha-boryl carbanions. We use DFT-parameters for capturing their electronic and steric properties, computational reactivity towards model substrates, and crystallographic analysis within the Cambridge Structural Dataset. This study maps the reactivity space by systematically varying the nature of the boryl moiety, the substituents of the carbanionic carbon, the number of alpha-boryl motifs, and the metal countercation. Furthermore, we can classify the alpha-boryl alkylidene metal precursors into three classes directly related to their reactivity. This trend map aids the selection of the appropriate reactive synthon depending on the sought reactivity.
Lanfranc, de Panthou Fabrice. "Chimie de coordination de radicaux libres nitroxydes : matériaux magnétiques incluant des ions de transition et des porteurs de spins organiques." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10121.
Повний текст джерелаБілянін, Роман Володимирович. "Тепловий контроль технічного стану індукційних установок для виробництва мідної катанки". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41338.
Повний текст джерелаThe thesis for a Candidate of Engineering Sciences degree by specialty 05.11.13 – devices and methods of control and determination of composition of substances. – National technical university "Kharkov polytechnic institute", Kharkiv, 2019. The thesis solves the important scientific task to improve methods of control of the technical condition of induction installations for the production of high-quality copper rod using the mathematical modeling of electrothermal processes in copper melt and multi-layer thermal insulation, with taking into account its degradation and temperature distribution on the installation surface, which is essential for the development of cable industry. A new method of non-destructive control of the technical condition of induction installations for the production of copper rod for power cables of energy value is developed, in which in addition to measuring the reactive and active resistances of the inductor and the reduction of the water temperature in the cooling system, the degree of degradation of multilayer thermal insulation is additionally determined by comparing the calculated distribution of the current temperature in the volume of melt and insulation on a three-dimensional mathematical model of the installation with practical measurement of temperature in local areas (in the work they were 72) of the surface of the furnace casing. This makes it possible to more accurately predict the furnace's profile and to detect the modes of its operation in a timely manner close to the emergency. A new technical solution for improving the multilayer thermoinsulation of induction installations has been developed in order to reduce their energy consumption and increase the resource. It consists in applying instead of the third thermal insulation layer of light-weight brick of three layers: monolithic refractory concrete, lightweight brick and refractory paper, with the preservation of the overall thickness of the insulation. The implementa-tion of the developed lining structure improvement at PJSC " YUZHCABLE WORKS" in the UPCAST US20X-10 induction installation for copper rod in the cable industry in Ukraine has yielded positive results in a 20°C decrease in the temperature of the furnace casing, a reduction of 5-15% of the specific cost Electricity for 1 ton of production and improvement of quality of copper rod, by reducing the percentage of foreign impurities and ensuring copper content in it 99,99%.
Білянін, Роман Володимирович. "Тепловий контроль технічного стану індукційних установок для виробництва мідної катанки". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41340.
Повний текст джерелаThe thesis for a Candidate of Engineering Sciences degree by specialty 05.11.13 – devices and methods of control and determination of composition of substances. – National technical university "Kharkov polytechnic institute", Kharkiv, 2019. The thesis solves the important scientific task to improve methods of control of the technical condition of induction installations for the production of high-quality copper rod using the mathematical modeling of electrothermal processes in copper melt and multi-layer thermal insulation, with taking into account its degradation and temperature distribution on the installation surface, which is essential for the development of cable industry. A new method of non-destructive control of the technical condition of induction installations for the production of copper rod for power cables of energy value is developed, in which in addition to measuring the reactive and active resistances of the inductor and the reduction of the water temperature in the cooling system, the degree of degradation of multilayer thermal insulation is additionally determined by comparing the calculated distribution of the current temperature in the volume of melt and insulation on a three-dimensional mathematical model of the installation with practical measurement of temperature in local areas (in the work they were 72) of the surface of the furnace casing. This makes it possible to more accurately predict the furnace's profile and to detect the modes of its operation in a timely manner close to the emergency. A new technical solution for improving the multilayer thermoinsulation of induction installations has been developed in order to reduce their energy consumption and increase the resource. It consists in applying instead of the third thermal insulation layer of light-weight brick of three layers: monolithic refractory concrete, lightweight brick and refractory paper, with the preservation of the overall thickness of the insulation. The implementa-tion of the developed lining structure improvement at PJSC " YUZHCABLE WORKS" in the UPCAST US20X-10 induction installation for copper rod in the cable industry in Ukraine has yielded positive results in a 20°C decrease in the temperature of the furnace casing, a reduction of 5-15% of the specific cost Electricity for 1 ton of production and improvement of quality of copper rod, by reducing the percentage of foreign impurities and ensuring copper content in it 99,99%.
Geszke-Moritz, Malgorzata. "Synthesis of stable and non-cadmium containing quantum dots conjugated with folic acid for imaging of cancer cells." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL066N/document.
Повний текст джерелаSemiconductor QDs are tiny light-emitting crystals, and are emerging as a new class of fluorescent labels for medicine and biology. The aim of this work was to develop a new class of non-toxic QDs probes with essential attributes such as water dispersibility, photostability, biocompatibility, high luminescence and possible excitation with low-energy visible light, using simple processing method. Such nanoprobes could be used for bio-imaging of cancer cells. In the performed studies, I focused on ZnS and ZnSe QDs as they are cadmium-free and might be excited biphotonically.The synthesis protocols of ZnS and ZnSe QDs doped with two ions such as Mn or Cu and stabilized by 3-mercaptopropionic acid or 1-thioglycerol were established, followed by NCs characterization (diameter, surface charge, photophysical properties, …) using analytical techniques such as spectrophotometry UV-vis, fluorimetry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), dynamic light scattering (DLS), infra-red analysis (FT-IR), thin layer chromatography (TLC) and electron paramagnetic resonance (EPR). The cytotoxicity of synthesized bare and conjugated NPs was evaluated on cancer cell lines using MTT, XTT and ferrous oxidation-xylenol orange assay.Finally, chosen well fluorescent and weakly toxic types of as-prepared and characterized QDs were used for bio-imaging of cancer cells. In these experiments, FA-functionalized NCs were excited biphotonically. The performed experiments showed the potential of QDs as cancer cells fluorescent markers and that they accumulate around the cell nuclei