372,899 research outputs found
Thermocapillary Multidewetting of Thin Films
No full textThermocapillary dewetting of liquids and molten films has recently emerged as a viable alternative to conventional microprocessing methods. As this thermal gradient-induced mechanism is universal, it can be applied to any material. This work explores the sequential dewetting of materials with varying melting points, including polymers and metals, to create aligned morphologies. The variation in melting point allows for the dewetting of single layers at a time or mobility-limited simultaneous dewetting. As a result, a variety of multimaterial structures can be produced with built-in alignment, such as arrays of concentric circles, lines with periodic segmentation, or islands on holes. This approach employs photothermal methods to induce the necessary thermal gradient, manipulating several variables in order to influence the consequent structures. Adjusting laser power and light intensity allows for the control of temperature for selective dewetting of films; altering beam size and exposure time affects the extent of dewetting in terms of diameter size; overlap effects and simultaneous dewetting can result in complex architectures. This controlled writing of patterns also presents a technique to create both masks at low temperatures for conductive multilayers as well as templates for electrospray deposition.Peer reviewe
Exploring Emptiness: An Investigation of MA and MU in My Sonic Composition Practice
No full textThe commentary investigates Japanese aesthetics of space, silence and emptiness - ma and mu - that informed my compositional practice during the research period 2012 - 2015. The portfolio comprises text compositions and sound installations in which forms of micro events and sustained events are employed. Throughout, the emphasis is on my personal engagement with, and manifestation of emptiness that concerns a particular model of listening and perception.
Chapter 1 discusses six primary research areas: ma and mu, material, text, form, listening and perception. Firstly, I introduce ma and mu by examining noh culture and Zeami's teaching of senu hima (where there is no-action) in the context of my personal approaches to music. The following subjects are then used to contextualise my PhD practice by means of examples from various composers and visual artists. Here, these particular and enigmatic concepts are explored through Japanese art as well as Western contemporary works by Alvin Lucier, Eliane Radigue and those of the Wandelweiser collective.
Part 2 provides contextual commentaries on selected compositions from the portfolio that mostly articulate my aesthetics in relation to the topics covered in Chapter 1. koso koso addresses my methodologies to investigate the essence of senu hima, followed by treow that discusses my approach to materials and the importance of space. I move on to grade two and grade two extended in order to examine text scores, and then, look into Espèces d'espaces 03 and 04 as examples of musical forms that I employ.
Finally, listening and perception are investigated through the compositions gnome and con.de.structuring. Throughout, I describe how my works explore emptiness as a result of my particular emphasis on listening over composing
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Localized physical vapor deposition via focused laser spike dewetting of gold thin films for nanoscale patterning
No full textFocused laser spike (FLaSk) excitation has been demonstrated as a reliable technique for the patterning of micro-to-nanoscale features locally by thermocapillary shear of thin films. Recent work on polymer thin films has revealed that overlapping laser scans can leverage coupled thermal and fluid effects to create subwavelength patterns. Compared to polymeric films, metallic thin films possess both a lower melt viscosity and higher surface tension. Here we investigate overlapping effects in the dewetting of ~15 nm gold thin films on borosilicate and quartz glass substrates with a 532 nm continuous wave laser. During this process, FLaSk initiates capillary and thermocapillary dewetting simultaneously. Further, the low oxidation potential and high vapor pressure of gold lead to non-equilibrium vaporization during heating. Since the parameters of overlapping scans control the amount of material that is heated and to what temperature it is heated, selection of laser power, scanning distance, writing speed, and numerical aperture results in particles with different sizes and spacing deposited on the writing substrates or a positioned superstrate through a laser-induced localized physical vapor deposition (LILPVD) process. If the laser parameters are selected within a specific working range, uniform or periodic particle distributions can be repeatably deposited in this fashion, which can then be used as seeds for nanomaterial growth. In addition, if the substrate melts during FLaSk, the viscous forces of the liquid-on-liquid dewetting broadens the range of patterning conditions by resisting the motion of the gold leading to more uniform particles over a large range of parameters.Peer reviewe
Characterization of MERS-CoV-MA-Δ4b and MERS-CoV-MA-mNLS mutants.
No full text(A) Huh-7 cells were infected with MERS-CoV-MA, MERS-CoV-MA-Δ4b or MERS-CoV-MA-mNLS at a m.o.i. of 0.1 for 24 h and the localization of 4b (in green) was analyzed by confocal microscopy. (B) Subconfluent monolayers of Huh-7 were infected with wild-type (black), Δ4b (red) or mNLS (purple) at a m.o.i. of 0.1 or 0.001. Culture supernatants were collected at 24, 48, 72 and 96 h p.i. and titrated by plaque assay. The average of two independent experiments is represented. (C) Pro-inflammatory response induced in Huh-7 by the infection with WT, Δ4b or mNLS. RNA was collected at 24 h p.i and quantified by RT-qPCR. Error bars represent standard deviations of the mean (n = 3). Differences with WT group were analyzed by Student’s t test: *, p-value < 0.05; **, p-value < 0.01.</p
Investigation of low-frequency dependent characteristics of Al/Maleic Anhydride (MA)/p-Si Schottky barrier diode
No full textIn this study, low-frequency-dependent characteristics of Al/Maleic Anhydride (MA)/p-Si organic Schottky barrier diode have been investigated. Maleic Anhydride (MA) has been successfully coated on p type-Si substrate with 280 m thickness and 10 ohm. cm resistivity, by spin coating. The ohmic (back contact) and Schottky (circular dots) contacts can be fabricated by the thermal evaporation technique. The fabrication of the ohmic and Schottky contacts was performed in vacuum (2.7x10(-7) kPa). By using capacitance-voltage (C-V) and conductance- voltage (G-V) measurements, electrical properties including barrier height, Fermi level, the width of the depletion region, series resistance and interface states were investigated. The C-V and G-V characteristics confirm that interface state density and series resistance of the diode are important parameters that strongly influence the electrical parameters exhibited by the MPS structure
Innate immune response and autophagy flux in MERS-CoV-MA-WT and MERS-CoV-MA-Δ4b infected MRC-5 cells after the autophagy pathway was chemically inhibited.
No full textmRNA expression levels of genes related to autophagy pathway and pro-inflammatory response were quantified by RT-qPCR in MRC-5 cells either mock-infected or infected with MERS-CoV-MA-WT or MERS-CoV-MA-Δ4b at a m.o.i of 1 for 24 h p.i after the treatment (+ 3-MA) or not (- 3-MA) with 5mM 3-methyladenine for 16 h. Bars represent means and error bars represent standard deviations (n = 3). Mock, Mock-infected cells. Differences were analyzed by Student’s t test: *, p-value < 0.05; **, p-value < 0.01; ***, p-value < 0.001. Asterisks on the columns represent significant differences between mock-treated and cells.</p
ma-N2400 series coating process parameters.
No full textma-N2400 series coating process parameters.</p
stefanocoretta/ma-thesis-york: v1.0.0
No full text<p>Research compendium of <em>Vowel duration and aspiration effects in Icelandic</em> (University of York MA dissertation).</p>
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