Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 38 for “"Material surfaces"”.
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Modeling curvature-resisting material surfaces using isogeometric analysis
… surface flexural resistance. The extension of material surfaces to account for flexural resistance, i.e., the Steigmann–Ogden model, requires spatial derivatives of second order, posing significant challenges to standard discretization techniques. Hence, the effect of surface curvature …
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Specific and non-specific interactions on carbon material surfaces.
… both polar and non-polar fluid phases and surfaces of various carbon materials: Activated Carbon (AC), non-porous Carbon Black (CB) and Multiwall Carbon Nanotubes (MWCNTs)with different surface chemistry have been studied. These are currently of great interest as they govern the interfacial …
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First Principles Study Of Tribopolymerization On Conductive Material Surfaces
… to organic-molecule polymerization under contact surfaces frictions, is used to lubricate and to protect the surfaces of mechanical gears, it is considered as a major source of contamination to Micro-electro-mechanical system and Nano-electro-mechanical system (MEMS and NEMS) transistors. MEMS and …
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Theoretical foundations for finite-time transient stability and sensitivity analysis of power systems
… systems. The theory of normally hyperbolic surfaces allows us to characterize the rate of expansion and contraction of co-dimension one material surfaces in the phase space. The expansion and contraction rates of these material surfaces can be computed in finite time. We prove that the …
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Investigation of plasma potential enhancement in the scrape-off layer of ion cyclotron range of frequencies heated discharges on Alcator C-Mod
… enhanced sputtering of molybdenum plasma facing surfaces and increased levels of core impurity contents, which subsequently degrade the core plasma performance. RF sheath rectification on open magnetic field lines that intercept material surfaces is currently suspected of causing an enhancement …
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Evaluation of monolayer protected metal nanoparticle technology
… represent a new class of synthesized materials with unique functionality. Such monolayer protected metal nanoparticles are capable of resisting protein adsorption, and if utilized as a coating could have broad application in a wide range of industries from consumer products to maritime …
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The contribution of construction materials to the airborne radon concentrations in an underground facility
… concentrations within fiber crete and the native material from the U1a Complex at the Nevada Tests Site, Nye County, Nevada, were quantified and compared to each other. Gamma spectroscopy measurements resulted in an average 222Rn concentration to be 0.038 +/- 0.0011 and 0.014 +/- 0.001 Bq g-1 for …
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Numerical and Theoretical Developments for Coherent Structures
… The structures obtained from this theory are material surfaces that have an exceptional effect on the contents of a flow and are key for understanding transport. These structures organize the contents of a flow and lead to a qualitative description of the fate of material under the influence …
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Haptic holography : an early computational plastic
… a force feedback device to image free-standing material surfaces with programmatically prescribed behavior. We present three implementations, Touch, Lathe, and Poke, each named for the primitive functional affordance it offers. In Touch, we present static holographic images of simple geometry, …
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Nanomechnics of crystalline materials : experiments and computations
… the mechanisms of deformation in crystalline materials. Such insight can be used to exploit and avoid contact in actuator and sensor applications, to derive mechanical properties for engineering of materials, and to investigate the fundamental role of defects. Here, localized mechanical …
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Plasma flows in the Alcator C-Mod scrape-off layer
… layer (SOL) of tokamaks, at locations far from material surfaces. Ballooning-like transport asymmetries are thought to be a principal driver for the strong parallel flows, a hypothesis supported by the observation of steep high-field side pressure profiles in double-null discharges. Yet parallel …
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Detailed simulations of bubble-cluster dynamics
… be an important mechanism of damage to adjacent material surfaces in both engineering and biomedical applications. Because of their complexity, past theoretical studies have generally been restricted to significantly simplified models, such as homogenized continuum models based upon volume …
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Influence of Nozzle Pressure, Standoff Distance, and Reinforcing Steel Cage on Water Jetting of CIDH Pile Anomalies
<p>The effectiveness of removing anomalous material from cast-in-drilled-hole (CIDH) piles by water jetting was examined. The primary objectives of this research were to examine how reinforcing steel influences water jetting and to evaluate how jetting pressures and standoff distance from the …
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A laboratory simulation of adhesive wear of high speed reciprocating components in water powered mining equipment
… the metal on metal surface interactions of materials under consideration for application in water powered stoping equipment. The suitability of this test rig was investigated by implementing a test programme covering self-mated stainless steel and stainless steel-on-bronze couples. These …
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Electronic States near Surfaces - a) Analysis of calculation methods using semi-infinite boundary conditions; b) Sensitive detection using laser photoelectron spectroscopy
… emission for ultra-high vacuum cleaved surfaces of CdSe, excited by 4.5 and 5.9 eV Ti:sapphire laser pulses of 150 femtosecond duration are reported. One- and two-photon excitation processes are observed and analyzed in terms of features of the electronic structure. In order to …
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Experiments and Simulations of Autonomous Microscale Robotics
… to allow facile metal patterning on 2D material surfaces, with which I fabricated mobile electronic microparticles; (ii) Based on experimental observations of autoperforated micro-architectures, I designed and theoretically validated an electrical circuit which integrates real-time …
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Hybridization of PolyJet and Direct Write for the Direct Manufacture of Functional Electronics in Additively Manufactured Components
… conjunction with direct write (DW) of conductive materials, enables the direct manufacture of parts featuring embedded electronics, including interconnects and sensors. The scope of previous works in which DW and AM processes are combined has been limited to single material AM processes. The …
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Improved performance of the hPIC particle-in-cell code by incorporating a new non-uniform implicit mesh based on the PUMI infrastructure
… electrostatic sheaths forming in front of the material surfaces. The hPIC Particle In Cell code developed previously at UIUC has been modified to incorporate a new implicit, parameterized, non-uniform mesh using the Parallel Unstructured Mesh Infrastructure (PUMI) library developed at RPI to …
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Adsorption of Biomacromolecules onto Polysaccharide Surfaces
… sources for sustainable and biodegradable materials. Interfacial behavior, including adsorption and enzymatic degradation, of several plant cell wall polysaccharides and their derivatives were studied with a quartz crystal microbalance with dissipation monitoring (QCM-D), surface plasmon …
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Leukocyte Response to Elastin-Like Polypeptide Coatings
… to address this issue include the development of materials that support endothelialisation and protein modification to the material surfaces that reduce thrombosis. The extracellular matrix protein elastin has been found to be one of the least thrombogenic components of blood vessels, and its …
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