Thèses sur le sujet « Characterization of surfaces »
Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres
Consultez les 50 meilleures thèses pour votre recherche sur le sujet « Characterization of surfaces ».
À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.
Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.
Parcourez les thèses sur diverses disciplines et organisez correctement votre bibliographie.
Borgh, Annika. « Biomimetic surfaces : Preparation, characterization and application ». Doctoral thesis, Linköpings universitet, Sensorvetenskap och Molekylfysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8492.
Texte intégralThis thesis describes the preparation, characterization and application of a few biomimetic surfaces. Biomimetics is a modern development of the ancient Greek concept of mimesis, i.e. man-made imitation of nature. The emphasis has been on the preparation and characterization of two types of model systems with properties inspired by nature with future applications in bioanalysis, biosensors and antifreeze materials. One type of model system involves phosphorylated surfaces; the other consists of surfaces mimicking antifreeze (glyco)proteins. The surfaces were made by chemisorbing organosulfur substances to a gold surface into monomolecular layers, so called self-assembled monolayers (SAMs). The physicochemical properties of the SAMs were thoroughly characterized with null ellipsometry, contact angle goniometry, x-ray photoelectron spectroscopy and infrared spectroscopy prior to application. The work on antifreeze surfaces was inspired by the structural properties of antifreeze (glyco)proteins, which can be found in polar fish. Two model systems were developed and studied with respect to ice nucleation of condensed water layers. One was designed to mimic the active domain of antifreeze glycoproteins (AFGP) and the other mimicked type I antifreeze proteins (AFP I). Subsequent ice nucleation studies showed a significant difference between the AFGP model and a (OH/CH3) reference system displaying identical wetting properties, whereas the AFP I model was indistinguishable from the reference system. The model systems with phosphorylated surfaces were inspired from phosphorylations and biomineralization. Two systems were developed, short- and long-chained amino acid analogues, with and without a phosphate group. A novel approach with protected groups before attachment to gold were developed for the long-chained analogues. The protective groups could be removed successfully after assembly. The long-chained SAMs were evaluated with electrochemical methods and significantly higher capacitance values were observed for the phosphorylated SAMs compared to the non-phosphorylated.
Hakim, Ali. « Characterization of Hard Metal Surfaces after Various Surface Process Treatments ». Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12433.
Texte intégralThe aim of this thesis is to investigate how material surfaces are affected by various surface treatments and how this relates to the adhesion of the coating. The materials that were studied were WC-Co and Cermets and the surface treatments used were polishing, grinding with coarser and finer abrasive grains, and finally wet blasting and dry blasting. Focus was on deformations and residual stresses in the surface, surface roughness and cracks. The test methods used for examining the samples included surface roughness measurements, residual stress measurements, adhesion tests using Rockwell indentation and SEM images of the surface and the cross section.
The results concluded that polishing gives very good adhesion. Additionally, the adhesion for ground surfaces was good for WC-Co but very poor for Cermets. Furthermore, it was observed that finer abrasive grains did not result in better adhesion. In fact, the coarser grains gave slightly better results. Finally, it was concluded that wet blasting has a clear advantage over dry blasting and results in much better adhesion, especially for the Cermets. The results for the WC-Co were a bit inconsistent and so further research is required.
Burton, Zachary Travis. « Surface characterization, adhesion, and friction properties of hydrophobic leaf surfaces and nanopatterned polymers for superhydrophobic surfaces ». Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1160489659.
Texte intégralAndrews, Marilyn Mockus 1958. « Characterization of the surface acidity of passivated iron particles by flow microcalorimetry ». Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276614.
Texte intégralMalagon, Nieto Camilo. « 3D characterization of acidized fracture surfaces ». Texas A&M University, 2003. http://hdl.handle.net/1969.1/5771.
Texte intégralDe, Zorzi Chiara <1976>. « Physico-chemical Characterization of Glass Surfaces : New Surface-related Analytical Approaches ». Master's Degree Thesis, Università Ca' Foscari Venezia, 2021. http://hdl.handle.net/10579/20493.
Texte intégralYang, Hongta. « Fundamentals, preparation, and characterization of superhydrophobic wood fiber products ». Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24796.
Texte intégralCommittee Chair: Yulin Deng; Committee Member: Jeffery S. Hsieh; Committee Member: Sujit Banerjee; Committee Member: Zhong Lin Wang.
Borgh, Annika. « Biomimetic surfaces : preparation, characterization and application / ». Linköping : Department of Physics, Chemistry and Biology, Linköping University, 2006. http://www.bibl.liu.se/liupubl/disp/disp2007/tek1069s.pdf.
Texte intégralKristensen, Emma. « Characterization of Surfaces Designed for Biomedical Applications ». Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Universitetsbiblioteket [distributör], 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6827.
Texte intégralJohnson, Max LeGrand Jr. « Characterization of geotechnical surfaces via stylus profilometry ». Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20705.
Texte intégralPerino, Mauro. « Characterization of plasmonic surfaces for sensing applications ». Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424012.
Texte intégralDurante il mio periodo di dottorato in Scienza e Tecnologia dell’Informazione l’attività di ricerca principale è stata focalizzata sulla caratterizzazione, simulativa e sperimentale, dei plasmoni di superficie. I plasmoni di superficie sono onde elettromagnetiche evanescenti che si propagano all’interfaccia tra un mezzo metallico ed un mezzo dielettrico. Il loro vettore d’onda è più elevato rispetto a quello della luce nel mezzo dielettrico. Per poter quindi generare l’eccitazione si devono utilizzare particolari tecniche di accoppiamento. I due metodi più diffusi sono l’accoppiamento Kretschmann e l’accoppiamento tramite reticolo. Una volta raggiunte le condizioni di accoppiamento dei plasmoni di superficie, si realizza il fenomeno della risonanza plasmonica, la quale si manifesta attraverso brusche variazioni nelle componenti della luce riflessa o trasmessa dalla superficie. Tipicamente si può registrare un minimo della riflettanza in funzione dell’angolo di incidenza della luce sulla superficie. Esistono, tuttavia, anche altre modalità per registrare e misurare queste risonanze, come ad esempio monitorando intensità, polarizzazione o fase della luce trasmessa e riflessa dalla superficie, in funzione della sua lunghezza d’onda o dei sui angoli di incidenza. Le variazioni chimico/fisiche che avvengono all’interfaccia metallo/dielettrico, modificando la costante di accoppiamento plasmonica, cambiano le condizioni di risonanza. Nel caso in cui le variazioni all’interfaccia siano dovute ad un processo di riconoscimento molecolare è possibile rilevare le molecole d’interesse valutando i cambiamenti della risonanza plasmonica, fornendo così l’opportunità per l’implementazione di sensori specifici. L’attività di dottorato è stata focalizzata innanzitutto sullo studio teorico del comportamento della risonanza plasmonica, utilizzando varie tecniche di simulazione numerica: il metodo RCWA (Rigorous Coupled Wave Analysis), Il metodo di Chandezon ed il metodo agli elementi finiti, implementato tramite Comsol v3.5. Ho poi affrontato lo studio, tramite simulazioni, delle risonanze di superficie in configurazione Kretschmann, sia per interfacce metallo/dielettrico piane sia per interfacce nano-strutturate. Considerando una configurazione conica, ho simulato le risonanze di superficie per nano-strutture reticolari e per nano-strutture bi-dimensionali periodiche. Inoltre ho analizzato il legame tra le modalità di accoppiamento grating e Kretschmann. Tramite queste simulazioni mi è stato possibile valutare e studiare la sensibilità delle varie risonanze plasmoniche alla variazione di indice di rifrazione, quando essa avviene all’interfaccia metallo/dielettrico. È stato così possibile identificare un nuovo parametro per descrivere la risonanza plasmonica e la sua sensibilità, ossia l’angolo azimutale, definito come l’angolo tra il vettore del grating ed il piano di scattering della luce. Considerando questo particolare angolo, la sensibilità del sensore può essere controllata con un’opportuna regolazione degli altri parametri coinvolti nell’eccitazione plasmonica, consentendole di raggiungere valori molto elevati. Successivamente, grazie all’utilizzo di due banchi, uno per la configurazione Kretschmann ed uno per la misura di reticoli nano-strutturati in configurazione conica, ho realizzato delle campagne di misure sperimentali. E’ stato così possibile confrontare i risultati sperimentali con le simulazioni numeriche per le seguenti condizioni: • Interfaccia piana, configurazione Kretschmann • reticolo nano-strutturato, configurazione Kretschmann • reticolo nano-strutturato, configurazione conica L’attività sperimentale si è particolarmente focalizzata sul reticolo nano-strutturato, sia per l’innovativa modalità di caratterizzazione delle sue risonanze plasmoniche (valutazione del segnale trasmesso in funzione dell’angolo di incidenza e dell’angolo azimutale), sia per l’elevata sensibilità ottenuta valutando la variazione dell’angolo azimutale. La caratterizzazione è stata effettuata sia per il reticolo esposto all’aria che per il reticolo immerso in un liquido (tipicamente acqua). Per poter verificare il comportamento della sensibilità azimutale ho variato l’indice di rifrazione del liquido in contatto con la superficie utilizzando soluzioni miste di acqua e glicerolo. Inoltre, tramite tecniche di funzionalizzazione della superficie, ovvero applicando delle molecole thiolate che vengono adsorbite sulla parte metallica dell’interfaccia, mi è stato possibile variare le costanti di accoppiamento plasmonico, in modo da verificare la capacità del dispositivo di rilevare l’avvenuta creazione di uno strato molecolare sulla superficie. Inoltre ho positivamente verificato la capacità di immobilizzare uno strato di anticorpi sulla superficie plasmonica. Tutte le misure sperimentali che ho svolto in questa tesi sono state effettuate su sensori con superfici piane o nano-strutturate prodotte dallo spin-off universitario Next Step Engineering, con il quale ho collaborato durante il percorso di ricerca.
Sarkar, N. « Synthesis and characterization of functionalized polyolefin surfaces ». Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1997. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3356.
Texte intégralZhang, Jinhong. « Surface Forces between Silica Surfaces in CnTACl Solutions and Surface Free Energy Characterization of Talc ». Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29997.
Texte intégralPh. D.
Nygren, Patrik. « De Novo Design and Characterization of Surface Binding Peptides - Steps toward Functional Surfaces ». Licentiate thesis, Linköping University, Linköping University, Sensor Science and Molecular Physics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8992.
Texte intégralThe ability to create surfaces with well-defined chemical properties is a major research field. One possibility to do this is to design peptides that bind with a specific secondary structure to silica nanoparticles. The peptides discussed in this thesis are constructed to be random coil in solution, but are “forced” to become helical when adsorbed to the particles. The positively charged side-chains on the peptides strongly disfavor an ordered structure in solution due to electrostatic repulsion. When the peptides are introduced to the particles these charges will strongly favor the structure because of ion pair bonding between the peptide and the negatively charged nanoparticles. The peptide-nanoparticle system has been thoroughly investigated by systematic variations of the side-chains. In order to determine which factors that contributes to the induced structure, several peptides with different amino acid sequences have been synthesized. Factors that have been investigated include 1) the positive charge density, 2) distribution of positive charges, 3) negative charge density, 4) increasing hydrophobicity, 5) peptide length, and 6) by incorporating amino acids with different helix propensities. Moreover, pH dependence and the effect of different nanoparticle curvature have also been investigated. It will also be shown that the system can be modified to incorporate a catalytic site that is only active when the helix is formed. This research will increase our understanding of peptide-surface interactions and might be of importance for both nanotechnology and medicine.
Kalil, Richard Charles Jr. « Evaluation of Frictional Characteristics of Precision Machined Surfaces ». Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5000.
Texte intégralMutti, Paolo. « Surface acoustic waves for semiconductor characterization ». Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357598.
Texte intégralSorenson, Elizabeth S. « Cache characterization and performance studies using locality surfaces / ». Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd950.pdf.
Texte intégralJordan, Stephanie Louise. « The characterization and reactivity of calcium hydroxide surfaces ». Thesis, Brunel University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296213.
Texte intégralAkhtar, Moeen. « Characterization of industrial foulants and designing antifouling surfaces ». Thesis, KTH, Tillämpad fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301965.
Texte intégralVid industriella processer (livsmedel, petrokemisk etc.) används ofta olika tekniker för separation med hjälp av gravitation. Sådana separationsprocesser drabbas ofta av oönskade beläggningar och påväxt på processutrustningens aktiva ytor så som t.ex. i en separator eller en dekanter, vilket orsakar problem med processen eller produktkvaliteten. För att återställa driftseffektivitet krävs särskilda rengöringssteg med både vatten och kemikalier vilket gör processen dyrare och mindre miljövänlig. Förutom drifttid och processvätskans sammansättning finns det flera faktorer såsom ytbeskaffenhet, ytjämnhet, materialtyp, ytladdning m.m. som påverkar mängden oönskade beläggningar på ytor. Föroreningarna på ytor kan tillväxa med olika mekanismer. Målet med detta forskningsarbete är att studera interaktionen mellan olika former av påväxt och ytan på rostfritt stål och senare utforma metoder för att förhindra bildandet av sådana oönskade beläggningar. Det är en stor utmaning att studera olika typer av påväxt för alla typer av flöden och industrier. I studien undersöktes organisk påväxt inom mejeri- och bryggeriindustrin genom att använda syntetiserade mjölk- och ölprodukter i laboratorieskala, för kvantitativa och statistiska undersökningar av dessa egenskaper. Flera olika experimentella metoder användes (FTIR, viktförändring, ytjämnhet, ytenergi). Det bekräftades att tillväxten på ytorna var olinjärt oavsett tid och lösningens koncentration. Bildandet och tillväxt av oönskade beläggningar kan minskas med hjälp av mera hydrofila ytor eller genom att minska ytans ojämnhet. Steriska hinder, elektrostatisk laddning och vattenbarriär eller hydratiseringsskal kan användas för att modifiera ytan och därmed fördröja bildandet av oönskade beläggningar. För att förhindra påväxt belades ytan med PMMA (organisk) och volframoxid (oorganisk). PMMA deponerades genom en doppbeläggningsteknik med användning av (6%, 10% och 12%) PMMA-lösning och volframoxidbeläggningen utfördes med ett elektrokemiskt tvåelektrodssystem med olika spänningar (3,5V och 4,5V) och tider (5min, 10min och 20min). Ytbeläggningarna karakteriserades genom att använda olika tekniker och deras förmåga att förhindra snabb påväxt studerades i modellösningar av mjölk och öl.
Dolan, Jeffrey Alan. « Characterization of Laser Modified Surfaces for Wood Adhesion ». Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/64352.
Texte intégralMaster of Science
Wang, Xueyuan. « Control and Characterization of Textured, Hydrophobic Ionomer Surfaces ». University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1341290657.
Texte intégralSorenson, Elizabeth Schreiner. « Cache Characterization and Performance Studies Using Locality Surfaces ». BYU ScholarsArchive, 2005. https://scholarsarchive.byu.edu/etd/603.
Texte intégralKortikar, Sarang Narayan. « FABRICATION AND CHARACTERIZATION OF DETERMINISTIC MICROASPERITIES ON THRUST SURFACES ». UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/334.
Texte intégralvan, Rensburg Wilma. « Characterization of natural antimicrobial peptides adsorbed to different matrices ». Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97929.
Texte intégralENGLISH ABSTRACT: Biofouling is the attachment and biofilm formation that leads to negative repercussions such as persistent post-harvest infections, infections obtained from medical implants and continual surface contamination of food processing plants. Much of the problem lies with the resistance that develops against conventional treatments due to the formation of mature biofilms. Thus the focus has shifted from the removal of biofilms to the prevention of initial attachment of organisms. This entails the use of antimicrobial surfaces that either have an inherent antimicrobial activity, e.g. certain metals, or surfaces that are modified by the attachment of antimicrobial agents. The attachment of antimicrobial agents can either be through covalent bonding or adsorption, depending on the intended use of the surface as well as the mode of action of the antimicrobial agent. Antimicrobial peptides (AMPs) are ubiquitous in nature, tend to have a broad spectrum of activity, are very stable and have been shown to maintain activity when covalently bound to solid surfaces. Tyrocidines (Trcs), antimicrobial peptides produced by Bacillus aneurinolyticus, are cyclodecapeptides with a broad spectrum of activity against Grampositive bacteria, fungi, yeasts and the human malaria parasite, Plasmodium falciparum. The aim of this study was to determine the antimicrobial activity of surfaces treated with a tyrocidine extract, under which conditions the activity remained stable and to look into possible applications of these peptide-treated surfaces. The study focussed on different solid surfaces namely mixed cellulose, polyvinylidene fluoride, polycarbonate, cellulose acetate, cellulose (paper)(CL) and high density cellulose packing material (HDC), as a pilot study to assess the antimicrobial activity of Trc and gramicidin S (GS) treated solid surfaces. Peptide desorption and subsequent analysis by mass spectrometry was used to confirm the presence and integrity of the Trcs adsorbed. Scanning electron microscopy was utilised to show that the adsorbed peptides did not affect the structural integrity of the treated filters. However, it was shown that the adsorbed peptides changed the hydrophobic/hydrophilic character by means of a wettability assay. A cell viability assay and erythrocyte assay were developed from existing methodologies to determine the biological activity of the AMP-functionalised polymeric material. Seven of the AMP treated solid surfaces showed antimicrobial activity when challenged with >105 Micrococcus luteus cells/cm2. Although the polycarbonate filter lost antimicrobial activity at the high cell concentrations, it was shown to have potent antimicrobial activity at lower cell concentrations. Complete inhibition of M. luteus growth was observed for both the gramicidin S and tyrocidine extract treated high density cellulose and cellulose filters. Stability tests showed that the tyrocidines remained adsorbed to cellulose filters and biologically active when exposed multiple water washes, water washes at different temperatures (25°C - 100°C) and pH changes (pH 1-12). The antimicrobial activity was only affected after exposure to the water wash of pH 13 which is possible due to susceptibility of the CL filters to high pH solvents. A preliminary study on the effect of Trcs treated CL filters on the sterilization, germination and effect on tomato seedlings was conducted. It was found that Trcs had no effect on the germination and did not fully sterilise the seeds or environment against fungi. However, it was observed that 5 μg/mL Trcs treated filters promoted root length opposed to the toxic effect seen with filters treated with higher Trc concentrations. It is hypothesised that Trcs prefer to bind to hydrophilic surfaces exposing the hydrophobic residues and the cationic residue of the peptide to interact with the bacterial membrane to elicit its antimicrobial response. The exposed residues contain some of the hydrophobic residues and the cationic Orn9/Lys9, which are crucial to the antimicrobial activity of the peptides. Hydrophobic interaction is particularly important for the haemolytic activity which is currently the only viable method of detection of the adsorbed Trcs. Trcs also have a preference for adsorption onto cellulose and cellulose analogues which points to possible application in protective food wrapping and wood surface protection. Trcs maintains its antimicrobial activity regardless of adsorption to solid surfaces. It can therefore be concluded that Trcs treated solid surfaces hold great potential in preventing the initial bacterial colonization and subsequent biofilm formation. Antimicrobial peptide enriched solid surfaces can thus be developed and tailored to a specific application such as filters, catheters and packaging materials.
AFRIKAANSE OPSOMMING: Biovervuiling is die aanhegting en vorming van biofilms met negatiewe gevolge soos aanhoudende na-oes infeksies, infeksies op mediese inplantings en voortdurende oppervlak besoedeling van voedselverwerkings fabrieke. Die probleem lê grotendeels by die weerstand wat ontwikkel word teen konvensionele behandelings as gevolg van die vorming van volwasse biofilms. Die fokus het gevolglik verskuif vanaf die verwydering van biofilms na die voorkoming van aanvanklike aanhegting van organismes aan oppervlaktes. Dit behels die gebruik van antimikrobiese oppervlaktes wat of 'n inherente antimikrobiese aktiwiteit het, bv. sekere metale óf oppervlaktes wat aangepas is deur die aanhegting van antimikrobiese middels. Die aanhegting van antimikrobiese agente kan of deur kovalente binding óf adsorpsie plaasvind, afhangende van die beoogde gebruik van die oppervlak, sowel as die metode van werking van die antimikrobiese agent. Antimikrobiese peptiede (AMPe) is alomteenwoordig in die natuur, is geneig om 'n breë spektrum van aktiwiteit te hê, is baie stabiel en het getoon dat aktiwiteit in stand gehou word wanneer dit kovalent gebind word op soliede oppervlaktes. Tirosidiene (Trcs), antimikrobiese peptiede wat deur Bacillus aneurinolyticus geproduseer word, is siklodekapeptiede met 'n breë spektrum van aktiwiteit teen Gram-positiewe bakterieë, swamme, giste en die menslike malaria parasiet Plasmodium falciparum. Die doel van hierdie studie was om die antimikrobiese aktiwiteit te bepaal van oppervlaktes wat met 'n tirosidien ekstrak behandel is, te bepaal onder watter omstandighede die aktiwiteit stabiel bly en om te soek na moontlike toepassings van hierdie peptied-behandelde oppervlaktes. Die studie het gefokus op verskillende soliede oppervlaktes naamlik gemengde sellulose, polyvinylidene fluoried, polikarbonaat, sellulose asetaat, sellulose (papier)(CL) en 'n hoë digtheid sellulose verpakkings materiaal (HDC), as 'n loodsstudie om die antimikrobiese aktiwiteit van die Trcs en gramisidien S (GS) behandelde soliede oppervlaktes te ondersoek. Peptied-desorpsie en daaropvolgende ontleding deur massaspektroskopie is gebruik om die teenwoordigheid en integriteit van die geadsorbeerde Trcs te bevestig. Skandering elektronmikroskopie is gebruik om aan te toon dat die geadsorbeerde peptiede geen invloed op die strukturele integriteit van die behandelde filters het nie. Daar is egter getoon dat die geadsorbeerde peptiede die hidrofobiese / hidrofiliese karakter verander. „n Lewensvatbaarheid selgebaseerde toets en eritrosiet toets is ontwikkel uit bestaande metodes om die biologiese aktiwiteit van die AMP-gefunktionaliseerde polimeriese materiaal te bepaal. Sewe van die AMP behandel soliede oppervlaktes het antimikrobiese aktiwiteit getoon wanneer dit met > 105 Micrococcus luteus selle/cm2 gedaag is. Hoewel die polikarbonaat filter antimikrobiese aktiwiteit met hoë sel konsentrasies verloor het, is dit getoon dat dit wel uitgeproke antimikrobiese aktiwiteit het teen laer konsentrasies selle. Volledige inhibisie van M. luteus groei is waargeneem vir beide die hoë digtheid sellulose en sellulose filters wat met GS en tirosidien ekstrak behandel is. Stabiliteit toetse het getoon dat die tirosidiene geadsorbeer en biologies aktief op sellulose filters bly nadat dit blootgestel is aan verskeie water was-stappe, waterwasse by verskillende temperature (25 °C -100 °C) en pH veranderinge (pH 1-12). Die antimikrobiese aktiwiteit was net beïnvloed ná blootstelling aan die water met 'n pH 13, wat moontlik is te danke aan die vatbaarheid van die CL filters by hoë pH oplosmiddels is. 'n Voorlopige studie is gedoen om die uitwerking van Trcs behandelde CL filters op die sterilisasie, ontkieming en tamatiesaailinge te bepaal. Daar is gevind dat Trcs geen effek op die ontkieming het nie, maar dat dit nie volledig die sade en omgewing steriliseer vir fungiese groei nie. Daar is egter waargeneem dat 5 μg/mL Trcs behandelde filters wortel lengte van die saailinge bevorder teenoor die giftige uitwerking soos waargeneem vir die filters wat met hoër konsentrasies Trcs behandel is. Dit word gepostuleer dat Trcs verkies om aan hidrofiliese oppervlaktes te bind wat die van die hidrofobiese aminosure en die kationiese residu van die peptied blootstel om aan die bakteriële membraan te bind om gevolglik antimikrobiese reaksie te ontlok. Die blootgestelde deel bevat sommige van die hidrofobiese residue en positiewe Orn9/Lys9 wat noodsaaklik vir die antimikrobiese aktiwiteit van die peptiede. Die hidrofobiese interaksies is veral belangrik vir die hemolitiese aktiwiteit wat tans die enigste bruikbare metode van opsporing van die geadsorbeerde Trcs is. Trcs het ook 'n tendens vir adsorpsie op sellulose en sellulose analoë wat dui op die moontlike toepassing in beskermende voedselverpakking en die beskerming van houtoppervlaktes. Trcs handhaaf hul antimikrobiese aktiwiteit, ongeag van adsorpsie aan soliede oppervlaktes. Dit kan dus afgelei word dat Trcs-behandelde soliede oppervlaktes die potensiaal het om die aanvanklike kolonisasie van bakterië te voorkom en die daaropvolgende biofilm vorming. Antimikrobiese peptied verrykde soliede oppervlaktes kan dus ontwikkel en aangepas word vir gebruik in spesifieke toepassing soos in filters, kateters en verpakkingsmateriaal.
Jiang, Guilin. « Characterization, Functionalization and Applications of Alkyl Monolayers on Silicon Surfaces ». BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1073.
Texte intégralRingwald, Steven. « Spectroscopic Characterization of Model Organic Pollutant Interactions with Mineral Oxide Surfaces ». Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/194460.
Texte intégralAllenspach, Rolf Allenspach Rolf Allenspach Rolf Allenspach Rolf. « Magnetic characterization at surfaces by spin polarized electron spectroscopies / ». [S.l.] : [s.n.], 1985. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7952.
Texte intégralSimpri, Emmanuel E. « Characterization of the robustness of superhydrophobic surfaces during condensation ». Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105671.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references (page 30).
Condensation is a process utilized by about 85% of power plants in their power generation cycles. Superhydrophobic surfaces can potentially improve the heat transfer due to condensation when compared to the untreated surfaces typically used in condensers. This can improve the efficiency of power plants by up to 3%. These surfaces are made by combining nanoscale roughness with chemical hydrophobicity, and can promote the mode of condensation that has the least resistance to heat transfer. However, it is unclear how long these surfaces will last under industrial conditions. This thesis is focused on testing the robustness of the surfaces in multiple experiments and analyzing the data gathered from these experiments, along with theorizing the mechanism behind any surface functionality deterioration that may be seen. Hydrophobic and superhydrophobic surface samples that have been prepared previously were subjected to water immersion and continuous condensation tests. For the water immersion tests, samples were submerged in water under neutral (pH = 7) and basic (pH = 10) conditions at room (~25°C) and elevated (~50°C) temperatures. The continuous condensations tests were run at a steam temperature of 27°C as well as 100°C. To understand the change in surface properties over the duration of the tests, the surface contact angle was chosen as the metric to be measured. The contact angles of water droplets on the samples were taken beforehand and throughout the tests using a micro-goniometer in order to quantify the change in surface functionality. The data gathered from these experiments were processed in Matlab to produce plots of the change in contact angle over the duration of each test. These plots showed significant contact angle decreases for the hydrophobic surfaces but little change in the contact angle for the superhydrophobic surfaces. This suggests that the addition of nanostructures on the surface, and thus the promotion of super- hydrophobicity, inhibits the surface functionality deterioration mechanism that is seen with the hydrophobic surfaces.
by Emmanuel E. Simpri.
S.B.
Pan, Sheng. « Molecular engineering and characterization of self-assembled biorecognition surfaces / ». Thesis, Connect to this title online ; UW restricted, 1999. http://hdl.handle.net/1773/9816.
Texte intégralCai, Mei 1967. « Spectroscopic characterization of alkylsilanes on metal and oxide surfaces ». Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282578.
Texte intégralMadaan, Nitesh. « Synthesis and Characterization of Complex Molecular Assemblies on Surfaces ». BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5748.
Texte intégralWalton, Ryan J. « Characterization of Road Surfaces Using High Resolution 3D Surface Scans to Develop Parameters for Predicting Tire-Surface Friction ». The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531432167496958.
Texte intégralViswanathan, Kalpana. « Synthesis and Characterization of Novel Polymers for Functional and Stimuli Responsive Silicon Surfaces ». Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27052.
Texte intégralPh. D.
GNANAPRAKASAM, PRADEEP. « CHARACTERIZATION OF SEED DEFECTS IN HIGHLY SPECULAR SMOOTH COATED SURFACES ». UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/318.
Texte intégralLambeth, Jacob Nelson. « Improved Methods for Gridding, Stochastic Modeling, and Compact Characterization of Terrain Surfaces ». Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19329.
Texte intégralTerrain measurements are not collected with uniform spacing, which is necessary for efficient data storage and simulation. Many techniques are developed to help effectively grid dense terrain point clouds in a curved regular grid (CRG) format, including center and random vehicle paths, sorted gridding methods, and software implementation. In addition, it is beneficial to characterize the terrain as a realization of an underlying stochastic process and to develop a mathematical model of that process. A method is developed to represent a continuous-state Markov chain as a collection of univariate distributions, to be applied to terrain road profiles. The resulting form is extremely customizable and significantly more compact than a discrete-state Markov chain, yet it still provides a viable alternative for stochastically modeling terrain. Many new simulation techniques take advantage of 3D gridded roads along with traditional 2D terrain profiles. A technique is developed to model and synthesize 3D terrain surfaces by applying a variety of 2D stochastic models to the topological components of terrain, which are also decomposed into frequency bandwidths and down-sampled. The quality of the synthetic surface is determined using many statistical tests, and the entire work is implemented into a powerful software suite. Engineers from many disciplines who work with terrain surfaces need to describe the overall physical characteristics compactly and consistently. A method is developed to characterize terrain surfaces with a few coefficients by performing a principal component analysis, via singular value decomposition (SVD), to the parameter sets that define a collection of surface models.
Master of Science
Díaz, Torres Raúl. « Synthesis, Characterization and Deposition on Surfaces of Curcuminoids-based Systems ». Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/663059.
Texte intégralLa nanociencia y la nanotecnología se han erigido como las áreas encargadas en diseñar y fabricar nuevos dispositivos cada vez más potentes y rápidos con el fin de satisfacer la creciente demanda tecnológica de nuestra sociedad. Una familia de moléculas muy prometedoras para ser aplicable en estos campos es la conocida como Curcuminoides (CCMoides) debido a su gran versatilidad. Esta tesis se centra en el diseño y síntesis de nuevos CCMoides para su posterior aplicación en diferentes campos de la nanociencia. Para ello, se han llevado a cabo distintas modificaciones en sus estructuras con el fin de conseguir propiedades interesantes. Los resultados obtenidos han sido agrupados en 5 secciones, cada uno de los cuales corresponde a un área de investigación diferente: (1) Magnetismo Molecular: La primera sección se centra en la búsqueda de sistemas que presenten propiedades de imán molecular. Para ello, se llevó a cabo un estudio magneto- estructural mediante la síntesis de varios compuestos de coordinación utilizando centros metálicos magnéticos (CoII y NiII) coordinados con el ligando CCMoide llamado 9Accm. (2) Electrónica Molecular: La segunda sección se centra en el estudio del transporte electrónico de un nuevo sistema CCMoide como parte activa de un sistema de tres terminales que actúa como transistor molecular de efecto campo. (3) Sensor Molecular: La tercera sección se centra en la inmovilización de CCMoides fluorescentes en superficies funcionalizadas que puedan actuar como sensores químicos de boro. Esta inmovilización se llevara a cabo en superficies de SiO2 mediante el uso de la técnica Microcontact printing. (4) Huésped-Anfitrión Molecular: La cuarta sección se centra en la fabricación de sistemas supramoleculares huésped-anfitrión. El primer estudio se centra en la utilización de ligandos CCMoide (huésped), que interaccionan con dos sistemas (ciclodextrina y cucurbiturilo) (anfitriones). Por otro lado, se realizó la síntesis de un nuevo CCMoide con el objetivo de que pudiese actuar como anfitrión mediante la formación de cajas moleculares. (5) Dador-Aceptor Molecular: La quinta sección se centra en el estudio de las propiedades aceptoras/dadoras de CCMoides para que puedan ser utilizados en la fabricación de celdas fotovoltaicas orgánicas (OPVs), llevándose a cabo la síntesis de dos familias de CCMoides con grupos aceptores y dadores.
Baumgärtel, Thomas. « Binding and characterization of fluorescent nano-aggregates on structured surfaces ». Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-91552.
Texte intégralSozer, Zeynep Bade. « Two-Dimensional Characterization of Topographies of Geomaterial Particles and Surfaces ». Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6866.
Texte intégralCorrigan, Catherine. « Characterization of secondary minerals forming at fracture surfaces in aquitards ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/MQ28188.pdf.
Texte intégralGingrich, Sarah Elizabeth. « Atmospherically derived organic films on impervious surfaces, detection and characterization ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/MQ46010.pdf.
Texte intégralLee, Chi-Ying. « Characterization of DNA-functionalized surfaces for microarray and biosensor applications / ». Thesis, Connect to this title online ; UW restricted, 2006. http://hdl.handle.net/1773/9915.
Texte intégralGombotz, Wayne Richard. « Poly(ethylene oxide) surfaces : synthesis, characterization and biological interaction studies / ». Thesis, Connect to this title online ; UW restricted, 1988. http://hdl.handle.net/1773/8028.
Texte intégralSaid, Mohamed Moustafa Mohamed Ali. « Characterization of titanium surfaces with different treatment and aging processes ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B4979968X.
Texte intégralpublished_or_final_version
Dentistry
Master
Master of Philosophy
Casanova, Moreno Jannu Ricardo. « Spectroelectrochemical characterization of ultrathin organic films deposited on electrode surfaces ». Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/47073.
Texte intégralZhao, Guiping. « Fabrication and characterization of nanowire arrays on InP(100) surfaces ». Thesis, University of Newcastle Upon Tyne, 2007. http://hdl.handle.net/10443/964.
Texte intégralStavroulakis, Petros. « Fabrication and characterization of biomimetic antireflective surfaces with reduced glare ». Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/340370/.
Texte intégralBurtovyy, Oleksandr. « Synthesis and characterization of macromolecular layers grafted to polymer surfaces ». Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1239895637/.
Texte intégralAl-Doasari, Ahmad. « Spectral characterization of desert surfaces in Kuwait by satellite data ». Thesis, Boston University, 1994. https://hdl.handle.net/2144/35676.
Texte intégralThis study is a part of an environmental impact assessment of the Gulf War on the desert and the coastal zones of Kuwait. Due to the appearance of many new surface features, a study was necessary to characterize their spectral signatures as detected by Landsat Thematic Mapper (TM) data. A sophisticated image analysis was applied to the Landsat TM scene. An unsupervised classification technique produced a thematic map of the area. Data was collected on the ground at eighty sites in southeastern Kuwait. A radiometer (SE-590) was used to identify the spectral reflectance of desert surface features. A Global Positioning System (GPS) reading on each site was also recorded to register accurately the field observations on a specific pixel from over 72 million pixels in the lower right scene of Kuwait. Field data were collected on surface feature color, soil grain stze, vegetation types and density, and the amount of oil or soot contamination. Statistical correlation's and companson of Landsat and the SE-590 measurements in the visible and near-infrared bands describe the interaction between radiation and different desert surfaces. The oil lakes class was identified to have the lowest reflectance of all the classes. Brightness values gradually increase as less oil, soot or desert vegetation is found. The highest brightness value belongs to the class which represents active sand.
Myronycheva, Olena. « Characterization of Mould Fungi Growth on Scots Pine Sapwood Surfaces ». Licentiate thesis, Luleå tekniska universitet, Träteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-73793.
Texte intégralSager, Benay. « Stereolithography Characterization for Surface Finish Improvement : Inverse Design Methods for Process Planning ». Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-04092006-155545/.
Texte intégralDr. David W. Rosen, Committee Chair ; Dr. Farrokh Mistree, Committee Member ; Dr. W. Jack Lackey, Committee Member ; Dr. Cliff Henderson, Committee Member ; Dr. Ali Adibi, Committee Member.