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 83 for “"Lattice Structure"”.
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Adaptive noise cancellation using multichannel lattice structure.
… vector generated from the multichannel adaptive lattice predictor. This multichannel adaptive noise cancellation procedure involves the NLMS adaptive algorithm. The performance of the new technique using different types of transmission channels, different types of reference inputs and different …
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A lattice structure on code metrics and beyond f-vectors of matroids
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
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The importance of crystal lattice structure of cellulose in the production and action of cellulase
… were taken to determine the effects of crystal structure on the induction and action of "cellulase.” The study was also aimed to obtain evidence from these experiments which may be helpful in elucidating the mechanism of the degradation of crystalline cellulose. The results of various …
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Investigation of a heirarchical collagen scaffold/3D printed lattice structure designed for use in total knee replacements
… (FDM) 3D printed poly ether ketone ketone (PEKK) lattice structure formed the load bearing component of the construct. This contained a lyophilised collagen scaffold filling the lattice voids, to encourage osseointegration. To understand the effects of printing parameters on the structure and …
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1D-to-3D transition of photon heat conduction in polyethylene using molecular dynamics simulations
… polyethylene, we examine the underlying phonon (lattice wave) transport using molecular dynamics simulations. We first show that the thermal conductivity of individual polyethylene chains is high, and can actually diverge (approach infinity) in some cases. We then discuss how the high thermal …
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Stiffness matrices of carbon nanotube structures
… done to determine the stiffness matrices of the lattice structure of graphene, the planar building block of carbon nanotubes. Through continuum linear elastic analysis and a displacement-based finite element method, the global in-plane stiffness matrix for an arbitrary carbon atom of the lattice …
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Improving the solubility and dissolution of poorly soluble drugs by salt formation and the consequent effect on mechanical properties
… improve solubility due to a very stable crystal lattice structure. The parent drugs were very difficult to compress due to orientation effects and lamination. Compacts were prepared of each parent drug and salt and their modulus of elasticity values were measured using a three-point bend (Young’s …
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High Performance Applications on Reconfigurable Clusters
… FIR filter. This filter is used in two of its structures: the direct-form and the lattice structure. The thesis describes several configurations that can be created with the different components available and reports the testing results of these configurations.
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Induction by a Hilbert hypercube representation
… added the various advantages of its orthogonal lattice structure as against less structured nets. We discuss the case for such a fundamental and low level empirical learning tool and the assumptions behind the machine are clearly outlined. Our theory of an orthogonal lattice structure the …
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Improvement of the axial buckling capability of elliptical cylindrical shells
… This approach is applied to a cylindrical lattice structure where it is assumed that the ribs are dense enough to be able to describe the lattice structure by means of an equivalent homogenized material. The orthotropic properties of the homogenized material are varied by varying the …
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Visualization of the Vortex Lattice Dynamics in Superfluid Helium
We study the lattice structure and dynamics of the quantized vortices in superfluid helium-4 using a new rotating experiment. This setup includes control of the entire apparatus from the rotating frame, installation of a new EMCCD camera that allows for imaging of nanoscale tracer particles, and …
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Structure and reactivity of diol host-guest compounds
The crystal structures of trans-9, 10-dihydroxy-9, 10-diphenyl-9, 10- dihydroanthracene with various guest molecules have been determined by X-ray diffraction. The guests were 2-butanone, 4-vinylpyridine, 4-methylpyridine and 2-methylpyridine. The host to guest ratios were determined by …
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Scanning tunneling microscopy investigations of transition metal dichalcogenide 1t-tantalum disulfide and zigzag-shape graphene nanoribbons in ultra-high vacuum
… measurements provide preliminary results on lattice structure of possibly monolayer or few- layer 1T-TaS2 under room temperature. Exploration of existence of charge density waves (CDWs) in monolayer 1T-TaS2 is in progress. Past work on surface modification of another TMDC material, MoS2, …
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Ion assisted magnetron sputtering of tantalum thin film deposition and characterization
… [alpha]-phase with a body centered cubic (bcc) lattice structure and a metastable [beta]-phase with a tetragonal lattice structure. The tough and ductile [alpha]-phase Ta is desired in most industrial applications, such as diffusion barrier layers in integrated circuits, metallic corrosion …
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Filtering techniques for mitigating microwave oven interference on 802.11b wireless local area networks
… Adaptive Notch Filter (ANF) which implements a lattice structure and has a time-varying notch frequency parameter that converges to and tracks the frequency of the interference in the received signal. The three filters are shown to produce improvements in the bit error rate (BER) and frame error …
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Structure Design and Luminescence Control of Eu⁺²-doped Orthorhombic Phosphors for Solid-State Lighting Applications
… sites, rather than the K sites, of the host structure. (2) A new solid-solution phosphor with a formula of K2(SrxBa2-x)(PO4)2: Eu2+ (x = 0-2) was synthesized. The optimized phosphor K2Sr1.25Ba0.75(PO4)2: Eu2+ demonstrates an extra-narrow blue emission (425 nm, FWHM =37.3 nm), enhanced quantum …
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Analysis of slurry composition for the direct ink writing of mayenite electride for use in thermionic cathodes
… a calcium aluminate ceramic with a cage-like lattice structure that traps in electrons, has been identified as a low-work function ceramic that could be used for these thermionic cathodes. This thesis explores an additive manufacturing (AM) process for mayenite electride components, including …
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Design, Analysis, and Application of Architected Ferroelectric Lattice Materials
… are determined by their inherent crystalline structure. This restriction limits the tunability of their piezoelectric properties. In the present work, ferroelectric lattice materials capable of a wide range of rationally designed piezoelectric coefficients are achieved through lattice …
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Isogeometric Design, Analysis and Optimisation of Lattice-Skin Structures
… techniques enable novel designs using lattice structures in mechanical parts, lightweight materials, biomaterials and so forth. Lattice-skin structures are a class of structures that couple thin-shells with lattices, which potentially combine the advantages of the thin-shell and the …
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Charged-defect transport induced stress in mixed ionic-electronic conducting ceramic membranes
… strain and distortion within the crystal lattice structure associated with changes in the local stoichiometry of the crystal lattice. This research is generally concerned with strontium-doped lanthanum cobaltites and ferrites (LSCF). The material is a mixed ionic and electronic conductor, …
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