Rozprawy doktorskie na temat „Micro deposits”
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Sprawdź 38 najlepszych rozpraw doktorskich naukowych na temat „Micro deposits”.
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Young, Thomas. "Dépôts micro structurés pour la réalisation de capteurs d’activité hydrolytique". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN062.
Pełny tekst źródłaPhytase, an enzyme capable of sequential hydrolysis of phytic acid to lower phosphorylated inositols and phosphate, has been increasingly added to animal diets to optimize phosphorus uptake by monogastric animals and to reduce its presence in faeces and soils. In this respect, the ability to measure its activity is obviously of primary interest. However, to date there are very few methods available to easily measure phytase activity in industry. The main reasons are that current techniques are time consuming, not suitable for complex feed samples and use hazardous reagents.In this thesis project, we proposed to develop an innovative enzymatic sensor dedicated to the detection of phytase activities in complex samples using a label-free approach thanks to Zymoptiq's technology. Phytic acid, the substrate of phytase, possesses numerous negative charges that can interact with positively charged polymers such as chitosan to form complexes. This phenomenon is well known and documented in the literature and is the cornerstone of our sensor. Our sensor is based on the degradation of micro deposits-based on a network structure of enzyme-insensitive chitosan chains cross-linked with phytic acid- when incubated in the presence of phytase activity (FTU/mL).However, to ensure the stability of the micro deposit, a systematic study was carried out to better control and understand all the underlying phenomena related to the complexes assembly. This also allows us to tailor our sensor's sensitivity. Through intermediate versions, we have demonstrated the ability to measure the activity of both a pure phytase sample of 100 FTU/mL and a simulated complex feed sample with activities as low as 20 mFTU/mL. Finally, after characterizing the hydrolysis mechanism of phytic acid complexed with chitosan by phytase, this study has enabled us to propose an innovative, safe and time-saving method of measurement
Barron, Lance W. "High-reflectance, sputter-deposited aluminum alloy thin films for micro-electro-mechanical systems /". Online version of thesis, 2005. http://hdl.handle.net/1850/5195.
Pełny tekst źródłaPerry, Richard. "Towards environmentally friendly electrodeposition : using citrate based electrolytes to deposit nickel and nickel-iron". Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/16184.
Pełny tekst źródłaJaber, Wassim. "Phonon heat conduction probed by means of an electro-thermal method involving deposited micro and nanowires". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI109/document.
Pełny tekst źródłaLe contexte de ce doctorat est la réduction des tailles impliquées dans le développement des matériaux et le confinement de la chaleur dans les dispositifs modernes, qui sont connus pour conduire à l'apparition de points chauds. L'objectif est d'étudier la conduction de la chaleur à partir de fils chauffés par Joule à l'échelle nanométrique et à l'échelle nanométrique, reposant sur des matériaux à couches planes. Une attention particulière est accordée à l'analyse de la dissipation thermique des phonons en partant de la conduction de Fourier bien connue et en entrant dans le régime balistique. Le manuscrit commence par un résumé des principaux effets observés sur la conductivité thermique effective dans les matériaux à l'échelle nanométrique, en particulier à la lumière des valeurs des voies libres moyennes des phonons et du nombre de Knudsen associé. Ensuite, les avantages et les inconvénients des différentes techniques de mesure sont discutés. L'analyse de la configuration expérimentale nécessite des études numériques 2D basées sur la méthode des éléments finis et des éléments finis de la conduction de chaleur par diffusion à partir d'une source finie dans un milieu. Limitations du 3! méthode en raison de la longueur du fil, de la géométrie du substrat et des couches minces d'oxyde sont mises en évidence. La configuration électro-thermique développée et la procédure utilisée pour déposer les dispositifs sur les échantillons sont ensuite détaillées. Un ensemble de matériaux bien connus avec un chemin libre moyen allant de quelques nanomètres à des centaines de nanomètres est caractérisé par des microfils. Les propriétés de conduction thermique des matériaux multicouches sont étudiées. La dissipation thermique des sources finies sur les substrats de silicium est ensuite mesurée en fonction de la température. Le libre parcours moyen est connu pour devenir important lorsque la température diminue. En conséquence, cette configuration fournit des indices pour comprendre la conduction de la chaleur à partir de sources balistiques. Le comportement observé est très différent de celui prédit par la loi de Fourier et montre une forte réduction de la dissipation. On trouve que les résultats sont comparables à des mesures antérieures impliquant des crêtes. Ils sont analysés avec différents niveaux d'approximations de prédictions en utilisant l'équation de transport de Boltzmann. Les résultats obtenus peuvent être utiles dans de nombreux domaines, en particulier pour les conceptions électroniques et thermoélectriques
Lawson, Thomas Ryan. "Micro-Raman spectroscopy and dry turning evaluations of nanostructured diamond films deposited on tungsten-carbide lathe inserts". Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008m/lawson.pdf.
Pełny tekst źródłaTripp, Marie K. "Atomic layer deposited thin films for micro- and nano-electromechanical systems with applications in short-wavelength adaptive optics". Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3165821.
Pełny tekst źródłaSteinhauer, Tim [Verfasser]. "On the Micro- and Ultrafiltration of Dairy Fluids - Molecular Mechanisms of Membrane Fouling and Elucidation of Deposit Layer Structures / Tim Steinhauer". München : Verlag Dr. Hut, 2016. http://d-nb.info/1113335769/34.
Pełny tekst źródłaBarbosa, Leo. "EXAMINATION OF MICRO-SCALE SULFIDE DISTRIBUTION FOR THE GOLD MINERALIZATION IN THE LAPPBERGET DEPOSIT, GARPENBERG MINE, SWEDEN: TOWARDS A GEOMETALLURGICAL APPROACH". Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87022.
Pełny tekst źródłaBarbakadze, Nato. "Micro-, nanomechanical measurements on insect and plant cuticles". Stuttgart Max-Planck-Inst. für Metallforschung, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=979181348.
Pełny tekst źródłaMcWilliam, Lyn. "Combined hydrogen diesel combustion : an experimental investigation into the effects of hydrogen addition on the exhaust gas emissions, particulate matter size distribution and chemical composition". Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/3611.
Pełny tekst źródłaBacha, Kenza. "Interaction entre les carburants diesel et biodiesel et les composants du système d'injection diesel". Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH4471.
Pełny tekst źródłaDiesel injection system must withstand more severe operating conditions (pressure, temperature), and be compatible with the evolution of diesel fuel, such as the introduction of Fatty Acid Methyl Esters (FAME) and use of different additives, which may affect the durability of the vehicle, following the formation of deposits. The objective of this work is to understand the mechanisms of deposit formation from fuel oxidation and determine the major parameters involved in deposit-substrate interactions (surface condition, materials, geometry, temperature...). Two studies were discussed. The first study focuses on the liquid phase accelerated oxidation of Diesel fuel, FAME and mixtures (Diesel / FAME) using PetroOxy device, the oxidation kinetic was determined for the different fuels and characterization of oxidation products was carried out using the (FTIR-ATR, ATG / DTG and GC / MS). The second study was dedicated to the reproduction of deposit on different substrates (aluminum, stainless steel, PEEK, aluminum coating on gold, silcoklean coating on stainless steel) using the Micro Coking device, and characterization of the deposit obtained in each case using (FTIR-ATR, ATG / DTG, XPS and FEG). The results of this work permit to determine the impact of FAME nature and FAME concentration on fuel oxidation stability; an hypothesis was proposed to explain deposit formation
Osika, Oleg. "Stability of micro-grids and inverter-dominated grids with high share of decentralised sources". Kassel : Kassel Univ. Press, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=982006888.
Pełny tekst źródłaGuiral, Vega Juan Sebastian. "Textural and Mineralogical Characterization of Li-pegmatite Deposit: Using Microanalytical and Image Analysis to Link Micro and Macro Properties of Spodumene in Drill Cores. : Keliber Lithium Project, Finland". Thesis, Luleå tekniska universitet, Mineralteknik och metallurgi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70422.
Pełny tekst źródłaThesis Presentation.
Textural and Mineralogical Characterization of Li-pegmatite Deposit: Using Microanalytical and Image Analysis to Link Micro and Macro Properties of Spodumene in Drill Cores. Keliber Lithium Project, Finland.
SITBON, STEPHANE. "Etude de films minces de nitrure de silicium deposes a basse temperature par plasma multipolaire micro-onde. Application aux structures si/si#3n#4 et inp/si#3n#4". Paris 7, 1996. http://www.theses.fr/1996PA077136.
Pełny tekst źródłaThieme, Michael, Christa Blank, de Oliveira Aline Pereira, Hartmut Worch, Ralf Frenzel, Susanne Höhne, Frank Simon, Lewis Hilton G. Pryce i Aleksandr J. White. "Superhydrophobic Aluminum Surfaces: Preparation Routes, Properties and Artificial Weathering Impact". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-107085.
Pełny tekst źródłaVorberg, Stefan. "Entwicklung von Platinbasis-Superlegierungen Untersuchungen im Mikro- und Nanometerbereich sowie die Ermittlung mechanischer Kennwerte". Berlin Köster, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2857214&prov=M&dok_var=1&dok_ext=htm.
Pełny tekst źródłaMurugavel, P. "Thin Films And Sub-Micron Powders Of Complex Metal Oxides Prepared By Nebulized Spray Pyrolysis And Brillouin Scattering Investigations Of Phase Transitions In Solids". Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/217.
Pełny tekst źródłaThieme, Michael, Christa Blank, de Oliveira Aline Pereira, Hartmut Worch, Ralf Frenzel, Susanne Höhne, Frank Simon, Lewis Hilton G. Pryce i Aleksandr J. White. "Superhydrophobic Aluminum Surfaces: Preparation Routes, Properties and Artificial Weathering Impact". Technische Universität Dresden, 2009. https://tud.qucosa.de/id/qucosa%3A26716.
Pełny tekst źródłaMurugavel, P. "Thin Films And Sub-Micron Powders Of Complex Metal Oxides Prepared By Nebulized Spray Pyrolysis And Brillouin Scattering Investigations Of Phase Transitions In Solids". Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/217.
Pełny tekst źródłaMayer, Miriam. "Vielfalt und Konsonanz in der Berichterstattung über Ereignisse und Akteure eine Inhaltsanalyse von Fernsehnachrichten und Tageszeitungen auf der Mikro-Ebene". Berlin Pro-Business-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=3066777&prov=M&dok_var=1&dok_ext=htm.
Pełny tekst źródłaWochnowski, Jörn. "Chemische Zersetzung zur Funktionalisierung von Oberflächen in Makro-, Meso-, Mikro- und Nanosystemen sowie Untersuchungen zu den katalytischen und optischen Eigenschaften der dargestellten Oberflächen /". Norderstedt : Books on Demand GmbH, 2008. http://deposit.d-nb.de/cgi-bin/dokserv?id=3076528&prov=M&dok_var=1&dok_ext=htm.
Pełny tekst źródłaYang, Jen-hung, i 楊仁泓. "Analysis of the local electric-field strength in the fabrication of micro-deposits by intermittent micro anode guided electroplating". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/93932052935280198528.
Pełny tekst źródła國立中央大學
機械工程研究所
97
Micrometer metallic pillars were fabricated by the intermittent micro-anode guided electroplating (MAGE) process in order to study (1) the localization of the pillar bottom, (2) the surface morphology of the pillars and (3) the cross-sectional structure along the axis of the micro pillars. The results and contributions of these studies were summarized as follows. (1). Two modes (i.e., one-step and multi-step) of the MAGE process were employed to explore the localization of localized electrochemical deposition (LECD). Circular area around the pillar bottom on the substrate was measured and its diameter was estimated to define the localization of the micro pillars. A tiny hillock was fabricated in one-step MAGE process. The diameter (i.e., localization) of the circle around the pillar bottom increases with increasing the electric biases between the micro anode and the substrate. In the multi-step MAGE process, the diameter of the circle increases with increasing the pillar height and levels off at a critical localization (Dc). The magnitude of the critical localization was found to be a function of electric bias and the initial gap between the micro anode and the pillar top deposited previously. The less the electric bias and the initial gap in multi-step MAGE, the diameter of the circular area around the pillar bottom is smaller. A model of micro-electroplating is proposed based on an electric strength ratio (i.e., Ecore/Ep) between the conical core strength (Ecore) to the conical periphery strength (Ep) and the electric voltage responsible for the critical localization. The strength ratio can be used as a criterion to predict whether a localization diameter increases or not. (2). Micrometer copper features fabricated by intermittent MAGE revealed different structures depending upon the experimental conditions. A hollow micro tube was developed at 4.0 V with an initial distance of 2μm/step. With decreasing the voltage from 4.0 to 3.2 V but increasing the initial distance from 2 to 25μm/step, a dense copper column with a smooth surface was formed instead of a rough-surfaced tube. The dense column was based on a substrate where revealed a larger area of circle around the column compared to that for the hollow tube. Finite element analysis is useful to establish a model for illustrating different morphologies of the micro features attained from MAGE process. According to this model, the structure is determined by the ratio (i.e., Ee/Et) of field strength at the periphery (Ee) to that in the center (Et) of the location. Hollow tubes were fabricated at a ratio higher than 1.5; dense pillars were attained at a ratio less than 1.0. (3). The internal structure of the micro feature was illustrated by examining the cross-sectional morphology along its axis. Fixing an initial inter-electrode distance of 2μm/step, the intermittent-MAGE conducted at 3.2 to 3.6V led to a micro structure with rough surface and porous internal. With increasing the voltage from 3.6 to 3.8V, a micro tube with rough surface was fabricated. Up to 4.0V, an imperfect micro tube with highly rough surface was formed. The mechanism of LECD under different conditions is illustrated by a sequence of models proposed.
Gusviputri, Arwinda, i 楊慎威. "Electrochemical ELISA for Estradiol Based on Chitosan Deposited Micro-platinum Probes". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/2s53ca.
Pełny tekst źródła國立臺灣科技大學
化學工程系
103
A convenient method for fabricating a sensitive indirect sandwich type electrochemical ELISA for the detection of estradiol using a chitosan electrodeposited platinum (Pt) wire microelectrode was proposed. In this assay, anti-17β estradiol produced in goat was used as the capture antibody which was immobilized on the chitosan coated Pt wire microelectrode, anti-17β estradiol 6 antibody produced in mouse was used as the detection antibody, and goat anti-mouse IgG conjugated with alkaline phosphatase (AP) was used as the secondary antibody. 4-Aminophenyl phosphate (4-APP) was chosen as the AP substrate and the oxidation potential of the electroactive AP product, 4-amino phenyl (4-AP), on the Pt electrode was determined to be +0.14 V (vs. Ag/AgCl). The electrochemical ELISA was detected by constant potential amperometry at +0.14 V in the Tris buffer (pH 9.0). The sensitivity (limit of detection) of this assay was 0.27 pg/mL with a wide detection range from 0.27 pg/mL up to 100 ng/mL. The assay specificity evaluated by testing the cross-reactivity of the assay against progesterone and 17α-ethynylestradiol was found to be 0.033% and 3.35%, respectively. The calibration curve of this assay tested in serum was also established. In this study, a sensitive, inexpensive, disposable, and easy to be fabricated electrochemical ELISA for estradiol was demonstrated.
Rao, K. Yellareswara. "Sputter Deposited Thin Film Cathodes from Powder Target for Micro Battery Applications". Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3825.
Pełny tekst źródłaRao, K. Yellareswara. "Sputter Deposited Thin Film Cathodes from Powder Target for Micro Battery Applications". Thesis, 2015. http://etd.iisc.ernet.in/2005/3825.
Pełny tekst źródłaOu, chang-ying, i 歐長穎. "Electroless Nickel Deposited of Micro-Arc-Oxidized Magnesium Alloy and its Corrosion Behaviors". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/73737829571147697748.
Pełny tekst źródła國防大學理工學院
化學工程碩士班
102
Magnesium alloys was developed as a structural material due to it has some excellent properties such as low density, high strength, casting-ability and workability. Therefore, it has high development potential in the industry applications. However, magnesium alloys are sensitive to corrosion and severely limit their application. Many surface treatment techniques have been developed to protect the magnesium alloys such as chemical treatment, oxidation, organic coatings, conversion coating, anodizing or metal coating. In this study, the micro-arc oxidation layer of magnesium alloy has been as the substrate and the catalyst was spread on the surface which make surface has a catalytic activity, and then the process was combined with the aqueous phase prepared with electroless nickel-phosphorus alloy coating. In this paper, SEM was used to observe the surface morphology and cross-section of coatings, the chemical composition of coatings was analyzed by EPMA, the corrosion resistance of coatings was examined by polarization curves and salt spray test, respectively. First, we analyzed the causes that why the corrosion resistance of micro-arc magnesium alloy after electroless nickel will drop down. The result reveals that the micro-arc magnesium alloy in the electroless nickel plating bath will produce a displacement reaction and erode the micro-arc magnesium alloy micro-arc layer and lead to the protective layer of micro-arc decline during electroless nickel processes. In addition, the hydrogen ions caused by the oxidation and reduction reaction between hypophosphite and nickel ions during electroless nickel process also decrease the corrosion resistance of the micro-arc magnesium alloy layer. Moreover, the chemical reaction rate within initial metal interface how to affect the corrosion resistance of the micro-arc magnesium alloy after electroless nickel process also be studied. The results presents that the rapid initial reaction rate will result in producing more hydrogen ion during electroless nickel process and lead to corrode micro arc layer seriously. The protection of micro-arc magnesium alloy layer will be decreased due to the corrosion of micro arc layer during electroless nickel process. Finally, via comparing various microstructure of micro-arc magnesium alloy, we found that the less defects within micro arc layer the better corrosion resistance of micro arc layer during electroless nickel process and after 24 hours of salt spray testing the surface of micro arc layer only generated few corrosion points.
CHEN, CHI-AN, i 陳麒安. "Nickel-phosphorus alloys deposited on magnesium alloy micro-arc oxidation layer using different catalysts". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/70561224320343144235.
Pełny tekst źródła國防大學理工學院
化學工程碩士班
105
Magnesium-lithium alloy(LZ91) is currently the lightest of practical metal, its advantages are light (similar to plastic), higher strength, specific rigidity and better heat dissipation. Magnesium alloy is extremely to corrosion which seriously affecting its application in real life. In this study, Micro - arc oxidation of wet - type method was used to prepare a oxide film on magnesium alloy which improves corrosion resistance. The surface of the magnesium-lithium alloy treated by micro-arc oxidation was not beautiful. In corrosive environment, the outside layer is prone to failure. In order to solve this problem, the outer layer of oxide film to seal, which can prevent corrosion factor invasion. The oxide layer is without any activity, which needs to soak in catalytic active solution, therefore nickel ions can be catalyzed and evenly coated on the micro-arc oxidation of magnesium alloy to enhance the corrosion resistance and aesthetics. First discussion different voltage on corrosion resistance of micro-arc oxidation layer. After finding the best operating conditions, and then explore the characteristics of different catalysts and the effect of coating on the best conditions of micro - arc oxidation. Finally, the micro-arc magnesium oxide alloy with different catalyst was coated with nickel-phosphorus layer by electroless plating, and observe the corrosion resistance. In the experiment, the surface morphology and cross-sectional were observed by scanning electron microscopy(SEM). Electrochemical test linear polarization curve and salt spray to detect the corrosion resistance. The size of the catalyst particles is analyzed by a light scattering instrument. Catalyst stability is analyzed by stability analysis instrument. Contact angle analysis instrument analyzes the affinity between the catalyst and the micro-arc oxidation layer. The experimental results show that: the flat and dense oxide layer was prepared at a Bipolar pulses voltage of 400 V, which corrosion resistance is better. In the corrosion resistance test, the electrochemical test obtained corrosion current of 1.4 × 10-7 A / cm2, salt spray test can be passed 48 hours. Next, with different catalyst on the best micro-arc oxidation layer. The results show that the pH value of the 7 N type catalyst has a better performance. Its effective particle size is the smallest, the stability is better. The affinity with the micro-arc oxide layer is best and the corrosion resistance to the micro-arc oxide layer is less affected. Subsequent to electroless nickel-phosphorus layer, which can pass salt spray 24 hours . It is the best process conditions.
Chen, Ming-Shan, i 陳明山. "The drilling performance and hole quality of multilayer diamond-like carbon deposited on micro-drill". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98817249896773949509.
Pełny tekst źródła建國科技大學
自動化工程系暨機電光系統研究所
101
The study is to research the drilling performance of a-C:H:Zr coatings prepared by sputtering graphite ,zirconium targets ,CH4 and C2H2 used unbalanced magnetron sputtering system. The stusy contains three stages .The objective is study the influence of Zr target current on the drilling properties of coatings in the first stage. It change the interlayer was from one multilayer to four multilayer in the second stage. Base on the second stage, results the coating hardness is low. In order to improve the hardness, the coating have been designed a multilayer structure. It contain both hard and soft layer in the multilayer coating in the third stage. The drilling performance of the coated micro-drills is evaluated by conducting high-speed through-hole drilling tests using printed circuit board (PCB) specimens. The service life of the coated micro-drills is assessed utilizing three different criteria, namely the nail head ratio, surface roughness of the drilled hole, and diameter of drilled hole, respectively. The result display that the S3 coating process the test drilling performance and the highest drilling life time. It can improve the life time of drilling above 6000 holes drilled.
Heng, Ying Cho, i 卓亨穎. "Mechanisms and ellipsometry studies of micro-crystalline silicon film deposited by ion-assisted RF sputtering". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/30816667292172060456.
Pełny tekst źródła輔仁大學
物理學系碩士班
101
According to the studies of microcrystalline silicon film deposited by plasma enhance chemical vapor deposition (PECVD), the three kinds of the film’s formation mechanisms are selective etching, surface diffusion, and chemical annealing. In this study, we discussed the formation of microcrystalline silicon films deposited by physical vapor deposition (PVD) of RF sputtering with the above three mechanisms. The silicon films fabricated at various deposition conditions were evaluated by optical spectrometer and ellipseometer to analyze the optical properties and to support the film’s formation mechanisms we postulated. From the investigations of XRD, the distance between Si target and substrate, and the deposition rate, the selective etching was not the main factor of micro-crystallization of silicon film. However, the chemical annealing may be the first reason and the surface diffusion be the secondary reason as evaluating optical properties of the silicon films fabricated with ion-assisted deposition and with heating from filament of end Hall ion source in RF sputtering. The energy from ion bombardment inputted into and enhanced the formation of the microcrystalline silicon film. Finally, the microcrystalline film fabricated by ion-assisted RF sputtering deposition in the total pressure of 1.75×10-2 Torr, at the partial hydrogen pressure of 40%, had the best crystalline structure. This result also supports the mechanism of crystallization our postulated.
Lin, Jian-Liang, i 林建良. "Diamond deposited from CH-COand CH-COgas systems using micro-ware plasma CVD". Thesis, 1991. http://ndltd.ncl.edu.tw/handle/53292811250759370559.
Pełny tekst źródłaBankoti, A. K. S. "Synergistic study on electrochemically deposited thin film with a spectrum from micro to nano range structures". Thesis, 2009. http://ethesis.nitrkl.ac.in/1462/1/Anil_Thesis_Final.pdf.
Pełny tekst źródłaWang, Yin-Jie, i 王胤傑. "Design and Fabrication of Screen Printed Thick Film and Stacked Aerosol Deposited Multilayer Piezoelectric Micro Energy Harvester". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/01648165897830033223.
Pełny tekst źródła國立臺灣大學
工程科學及海洋工程學研究所
103
The concept of “Internet of Things” has become a hot topic in recent years, and the need for sensing devices has risen substantially. Due to the advancement of VLSI technology, the power consumption of micro-scale smart devices has gradually reduced to tens of microwatts. As such, the ability to produce this level of energy in large quantity has become an important task. Traditional use of power cord to supply energy or the usage of battery has proven to be quite inconvenient, for the placement of the devices may be hard to reach, and the lifetime of such power sources are often unreliable. A method that utilizes the environment to provide a self-powered electrical energy will be beneficial. Solar power can be used as a general resource, but in many cases the devices are installed in enclosed areas where lighting is insufficient. Therefore, vibrational energy sources has become a primary target for energy extraction. In order to create a piezoelectric energy harvester that is suitable to provide energy for further applications, a screen-printing technique to create thick film is discussed in chapter three of this paper. The technique is used to deposit high quality piezoelectric film in a short amount of time. In chapter four, the structure and design of the piezoelectric harvester is discussed, to improve the overall output of the harvester. Experimental results indicate that the PZT piezoelectric thick film has avoided the oxidation and vaporization of lead from the material when a sintering process has been done. The high temperature sintering process can preserve a better piezoelectric characteristic. Additionally, Aerosol deposition method is used to fabricate a multilayer micro energy harvester. By poling each layer’s dipole in parallel form, and connecting each layer in parallel to measure the performance, we can obtain the optimal load to be 15kΩ, and the optimal output power to be 80.14μW when the device is operating at its resonant frequency of 121.5Hz and under 1g acceleration. In comparison to a single-layer structured device, the output load resistance has been lowered to almost 10 times, and the output current at the optimal load has increase to about three times.
Wu, Han-Hua, i 吳函樺. "Micro-Raman spectroscopy and Transmission Electron Microscopy investigation of YBCO thin films deposited by RF-magnetron sputtering". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/82293177786854807521.
Pełny tekst źródła國立中興大學
物理學系所
101
In this work, YBCO films were deposited by RF magnetron sputtering on (100) strontium titanate substrate. X-ray diffactometry, Raman spectroscopy and field emission transmission electron microscopy were used to investigate the lattice structure of the YBCO films. The superconducting critical temperature varied significantly with the temperature of the substrate. Raman spectroscopy revealed that the lattice structure at low substrate temperature was visibly orientated a-axis. The a-axis orientation and lattice defects in the microscopic structure were observed. And the area of the a-axis orientation was small and disordered. Raman spectroscopy revealed that the a-axis orientation became weak as the substrate temperature increased. And the area that exhibited that orientation increased in the microscopic structure. Finally, no a-axis orientation was observed at a substrate temperature of 730 ℃. The orientations of YBCO films were clearly and easily observed by Raman spectroscopy. A suitable area can be to patterned to increase the success rate of Josephson junctions and Superconducting Quantum Interference Devices.
Jin, Zhe. "Low-loss coupling to sub-micron thick deposited film rib and nanowire waveguides by vertical tapering". Master's thesis, 2012. http://hdl.handle.net/1885/151722.
Pełny tekst źródłaPan, Chin-Chang, i 潘錦昌. "Micro/Nano Mechanical, Material Properties and Tribological Performance of a-C:H(N) Thin Films Deposited by Low-Temperature Ion Beam Process". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/g3us7g.
Pełny tekst źródła國立成功大學
機械工程學系碩博士班
90
The adhesion effects to the load-depth curves of nano-indentation test and the theoretical relation of micro/nano hardness are researched in this study. The effect of nitrogen containing and film thickness to the a-C:H and a-H(N) diamond like carbon film structures and micro/nano mechanical and tribological properties is involved, too. The hardness and Young’s modulus are measured by nano-indentation performed by NanoTest, and the capillary attraction and van der Wall force calculated in order to assess the adhesion effect of different nitrogen containing and film thickness. In the residual stresses of films, the profile data are measured before and after coating by 3-D profilemeter and the radius of curvature are calculated by regression; therefore the residual stress can be obtained by the radius of curvature before and after coating according to the stress theory and the effect of the residual stress can be discussed. In measuring tribological properties, we scanned and scratched sample surfaces by Scanning Probe Microscope and NanoTest with different speeds and loads. In examining samples, we measured composition and bonding by ESCA and Raman spectrum, and measured the optical properties by Ellipsometer. According to the experimental results, the adhesion effects to the load-depth curves are significant as the indentation depth is lower than 50 nm, and the effect gets larger as depth decreases. And we found that the very thin (about 50 nm) diamond like carbon film has large hardness and Young’s modulus and excellent anti-wear property and surface roughness. There are two characters in this study: (1) considering the capillary attraction and van der Wall force under nano-scale and observing the fact that the hardness without considering adhesion effect is much larger; (2) Obtaining hardness by the energy method and considering the effects of elastic work due to elastic recovery and adhesion work due to adhesive forces.
Fisher, Louise. "Hydrothermal processes at the Osborne Fe-Oxide-Cu-Au deposit, N.W. Queensland: integration of multiple micro-analytical data sets to trace ore fluid sources". Thesis, 2007. https://researchonline.jcu.edu.au/4782/1/01front.pdf.
Pełny tekst źródłaMorais, Bruno Daniel Pinto. "Characterization of the micro and nanostructure of biocide nanocomposites based in transparent titanium dioxide nanocoatings deposited on polymeric foils for food packaging applications". Master's thesis, 2015. http://hdl.handle.net/1822/35015.
Pełny tekst źródłaPackaging provides containment and protects food products during distribution and storage from external and internal unfavorable conditions, such as water vapor, microorganisms, gases and odors. Nowadays consumers’ demands require the development functional packaging systems with enhanced quality and self-life such as active food packaging which directly interacts with the food product through a mechanism triggered by intrinsic and/or extrinsic factors. Due to the rise in deaths and hospitalizations related with food poisoning and foodborne diseases, much effort has been made to design efficient antimicrobial active packaging systems. Many antimicrobial agents are available, including both organic and inorganic. One of these potential agents is titanium dioxide (TiO2). Since the discovery of the photocatalytic potential of TiO2, there has been an increase in research and products that take advantage of this process for depollution and disinfection applications and, more recently, antimicrobial food packaging. Its strong photocatalytic yield is the result of the high oxidizing power under UV-light. Other attractive properties include high chemical stability, non-toxic to both human and the environment, and high availability and low cost. Despite its limitations, such charge recombination rate and need of an UV-light source, which decrease the overall effectiveness of photocatalytic, intensive research is turning TiO2 into one of the most effective antimicrobial agents in food packaging applications. With this in mind, TiO2 thin films were deposited on PET/PLA using pulsed DC magnetron sputtering technique, at room temperature. The films were characterized for their morphology (SEM), crystalline structure (XRD), optical properties and thickness (UV-vis-NIR spectrophotometry and FTIR), and wettability (dynamic contact angle). The photocatalytic activity was evaluated by photodegradation of rhodamine B under UV irradiation. The films produced were predominantly amorphous and showed no sign of photocatalytic activity due the lack of crystallinity structure thus being incapable of producing an antimicrobial response. However, some samples showed potential for crystalline growth, evidenced by broad protuberances in 2θ regions associated with anatase and rutile phases. All depositions in PLA exceeded the Tg, which lead to a complete dismissal of this polymer, while a few depositions in PET managed to keep the temperature below the polymer’s Tg, avoiding deformation and loss of mechanical viability of the polymer.
As embalagens providenciam contenção e protegem os alimentos durante a sua distribuição e armazenamento de condições externas e internas desfavoráveis como o vapor de água, microorganismos, gases e odores. Hoje em dia, as exigências dos consumidores requerem o desenvolvimento de sistemas funcionais para embalagens com qualidade e “tempo de prateleira” melhorados como, por exemplo, as embalagens activas que interagem directamente com o produto alimentar através de mecanismos activados por fatores intrínsecos e/ou extrínsecos. Devido ao crescente aumento de mortes e hospitalizações relacionadas com intoxicação alimentares e doenças transmitidas por alimentos, muito esforço tem sido dado ao design de embalagens alimentares com sistemas antimicrobianos eficientes. Muitos agentes antimicrobianos estão disponíveis, tanto orgânicos como inorgânicos. Um destes é o dióxido de titânio (TiO2). Desde a descoberta do seu potencial fotocatalítico, tem havido um aumento na investigação e produtos que se aproveitam desta característica, incluíndo aplicações na descontaminação e desinfecção e, mais recentemente, aplicações antimicrobianas nos alimentos. O seu forte potencial fotocatalítico é derivado de um elevado poder oxidativo, quando exposto a luz UV. Outras características incluem estabilidade química, não toxicidade para os humanos e o ambiente, disponibilidade e baixo custo. Apesar das suas limitações, como a taxa de recombinação de cargas e necessidade de um fon te e luz UV, que diminuí a eficiência do processo fotocatalítico, investigação está a tornar o TiO2 num dos principais agentes antimicrobianos de embalagens alimentares. Com isto em mente, filmes de TiO2 foram depositados em PET/PLA utilizando pulverização catódica por magnetrão pulsado. Os nanocompósitos produzidos foram caracterizados quanto à sua morfologia (SEM), estrutura cristalina (XRD), propriedades ópticas e espessura (espectrofotometria UV-vis-NIR e FTIR) e molhabilidade (ângulo de Contacto). A actividade fotocatalítica foi avalição por fotodegradação do corante rodamina B sob luz UV. Os filmes produzidos são predominantemente amorfos e não apresentam actividade fotocatalítica devido à ausência de uma estrutura cristalina, portanto são incapazes de produzir uma resposta antimicrobiana. Alguuns filmes apresentam potencial para crescimento cristalino devido à presença de proturberâncias em regiões associadas à fase anatase e rutile do TiO2 As temperaturas atingidas nas deposições ultrapassam a Tg do PLA mas no caso das deposições em PET, algumas deposições conseguem manter-se abaixo do mesmo.
Yang, Yun-Kai, i 楊雲凱. "Theoretical Analysis of Adhesion Energy and Micro/Nano Tribological Performance of a-C:H(N) Thin Films Deposited by Low-Temperature Ion Beam Process". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/w7qppu.
Pełny tekst źródła國立成功大學
機械工程學系碩博士班
90
The adhesion energies and critical loads of a-C:H and a-C:H(N) diamond like carbon films coated by ion beam deposition by scratch tests are researched in this study. The effect of nitrogen containing and film thickness to the adhesion energies is involved, too. In the theoretic analysis, the stress and strain distribution of sample under critical load causing film to strip off from substrate are derived from the uniform pressure in spherical shell. By simulating the stress and strain of substrate under scratch test and the continuality of strain between film and substrate, we derived the elastic storage energy of film and calculated the adhesion energy between film and substrate. In experimental parts, the critical loads are measured from scratch test under different scanning speeds and loading rates performed by the NanoTest and the Surface Response Method is used to analyze the measured critical load data. Furthermore, the adhesion energies are modified by the indentation tests. The residual stresses of films are calculated by the surface profiles measured before and after coating by 3-D profilemeter. In examining samples, we measured composition and bonding by Chemical analyzer and Raman spectrum, and measured surface by Atomic Force Microscope. In researching anti-wear properties, we calculated the wear volumes of scratches under different speeds and loads by NanoTest. According to the experimental results, the critical loads are higher as more nitrogen containing; however, the critical load of the film of 66 percent nitrogen containing is very low because of much graphitizing. Under the condition of the same film thickness and nitrogen containing, the higher critical load indicates the smaller residual stress and larger adhesion energy.