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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 49 for “"corrugation"”.
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An efficient computational framework for prediction of corrugation in twisted bilayer graphene
… distances in different stacking regions. The corrugation increases with decreasing twist angle in the TBG. Moreover, we also find that the AA region in the TBG shrinks and the AB region becomes larger at low twist angles (less than 1.5$^{\circ}$). Our framework is able to capture this …
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Tension-induced tunable corrugation in two-phase soft composites and its properties as a band gap structure
… the inclusion pattern, it is possible to induce corrugations normal to the direction of stretch. By stacking 1D composite fibers to form 2D membranes, these corrugations collectively lead to the formation of membrane channels with shapes and sizes tunable by the level of stretch and enable the …
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Statistical mechanical theory of equilibrium structure and miscibility of polymer nanocomposites: effects of polymer chemical heterogeneity and architecture, and nanoparticle surface corrugation and softness
… and enhanced miscibility. Optimal surface corrugation and/or particle softness allow monomer penetration resulting in favourable (entropic) mixing. However, high enough degree of corrugation/softness can also result in destabilization by excluding the polymer from its interior. Another …
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Mass transfer coefficients and effective area of packing
… with surface area from 125 to 500 m²/m³ and corrugation angle from 45 to 70 degree were tested to explore the effect of packing geometries on mass transfer. The effective area increases with packing surface area and liquid flow rate, and is independent of gas velocity. The packing corrugation …
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Glassy viscoelasticity of dense suspensions of soft colloids and structure & miscibility of soft filler polymer nanocomposites
… nanoparticle morphology associated with surface corrugation and fluctuation at one and two particle limit in polymer melts with/without interfacial cohesion. Our results provide a physical basis for the unexpected ability to disperse chemically matched crosslinked polystyrene in linear …
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Investigations of the Band Structure and Morphology of Nanostructured Surfaces
… which are used to image and characterize corrugation in SiO₂-supported and suspended exfoliated graphene at nanometer length scales. Diffraction line-shape analysis reveals quantitative differences in surface roughness on length scales below 20 nm which depend on film thickness and …
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Convection in Corrugated Slots
… secondary motion takes place in the absence of corrugation. Corrugations have a sinusoidal form characterized by the wave number a, the upper and lower amplitudes and the phase difference between the upper and lower corrugation systems. They create horizontal temperature gradients which lead to …
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Interactions between 0-Dimensional and 2-Dimensional Materials
… This susceptibility will introduce surface corrugation, chemical reactivity and electron-hole puddles to graphene, and finally will lead to different morphology of metal nanoparticles on graphene. Using classical nucleation theory, different diffusion constants of Au adatoms were reported on …
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Effects of Corrugations on Stiffness Properties of Composite Beams for Structural Applications
… be maximized by changing the geometry. By adding corrugations, the flexural stiffness is increased in one direction compared to the stiffness of a flat part with the same amount of material. Thus, stiffness increases without a change in weight. The primary goal of this research was to investigate …
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Heat Transfer Assessment of Aluminum Alloy Corrugated Naval Ship Deck Panels under VTOL Aircraft Thermal Loads
… the effects of variation in the geometry of the corrugation between specimen. Qualitative temperature distributions were also gathered on the impingement surface via thermal imaging. A quantitative assessment of the heat paths for transverse and vertical heat transfer was made based on a thermal …
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Mechanical Properties of Lightweight Sandwich Panels with Corrugated Plywood Core
… and existing analytical solutions. In single corrugation tests, 1-ply and 2-ply laminate models were found to match experiments well, while the sti ness and strength of 3-ply specimens were over-predicted. Numerical nite element (FE) predictions of sti ness and strength for shear along and …
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Thermal Interaction of Inert Additives in Energetic Materials
… rate enhancement in certain cases. Flame front corrugation that increases the reaction front area observed at micron to sub-millimeter scales was proposed previously to explain the phenomenon. However, a recent simulation study observed a significant temperature gradient within the inert …
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Aeroelastic optimization of thin flapping structure
… flow. Finally, we explored the effect of corrugation on the flapping plate and found that the fan employs the interesting mechanism of reversible buckling to simultaneously increase the velocity of the flow and reduce the load.
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Vertical dynamics of railway vehicle-track system
… and track, and the dynamic force due to rail corrugations are evaluated for high speed operation. The results of this study show that the impact load is maximum at the ties, and is strongly influenced by the axle load, vehicle speed, actual shape of the defect, and rail equivalent mass. …
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Effects of Bio-Composites in Corrugated Sandwich Panels Under Edgewise Compression Loading
… compression loading. To do this, optimum corrugation geometry was identified using theoretical analysis of the moment and bonding area of the shape. Control tests with carbon fiber and hemp were conducted. The bio-composite was integrated in both the core and the skin individually in …
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Surface Effects on Anchoring and Dynamical Interactions of Liquid Crystalline Films
… in which it is discovered that spicular corrugation on the surface induces a homeotropic alignment, whereas a grooved morphology promotes a planar and homogeneous alignment. In a cell whose surfaces are modified chemically by amorphous polyimide layer, the initial anchoring induced is …
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Nanostructure formation in thin polymer films
… of gyration of the polymers. The substrate corrugation causes a regular variation of the film thickness. We start with a homogeneous film, which is annealed above the glass transition temperature. During annealing the films are stable or form long polymer nanochannels, which lie in the …
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Scattering of aligned H₂ from Si(100)
… between changes to alignment originating from corrugation in the molecule-surface potential with the bond’s polar (θ) and azimuthal angle (φ) relative to the surface normal. The results of the experiment indicate substantial but not complete reduction in alignment of the scattered molecules. …
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The numerical and experimental investigation of gyro-multiplier configurations
… The introduction of an eight-fold azimuthal corrugation into the walls of a cylindrical cavity allows for the realisation of a single cavity gyro-multiplier arrangement, with generation of 2nd harmonic, TE2,2, and 4th harmonic, TE4,3, resonances, at frequencies of 37.5 GHz and 75 GHz, …
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Organic semiconductor lasers with two-dimensional distributed feedback
… with an appropriate onedimensional surface corrugation, edge- and surface-emitting lasers were fabricated. Excellent agreement is found between the performance of these 1D-DFB lasers and the predictions of a quantitative numerical modeling. Unless further precautions are taken these lasers …
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