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 27 for “"reduced dimensionality"”.
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Magnetic ordering in systems of reduced dimensionality
The magnetic behaviour of thin films of (111) FCC structures and (0001) corundum structured materials were studied by the mean field analysis and some Monte Carlo simulation. These models were conditioned on a mapping from first principles calculations to the Ising model. The effect of the …
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Quantum-size effects in the electronic structure of novel self-organized systems with reduced dimensionality
… of photoemission. Further, nanosystems of lower dimensionality have been studied. Stepped surfaces W(331) and W(551) were used as one-dimensional model systems and as templates for self-organization of Au nanoclusters. Photon energy dependent photoemission revealed a surface resonance which was …
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Building a Nonparametric Model After Dimension Reduction
… dimensions needed. We study four tests of dimensionality: a chi-square test, a Wald-type test on eigenvalues, a modified Wald-type test, and a matrix rank test. These tests are motivated from different aspects of the problem and have their own strength and weakness. We discuss and compare …
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A Study of Dimensionality Reduction Techniques and its Analysis on Climate Data
Dimensionality reduction is a significant problem across a wide variety of domains such as pattern recognition, data compression, image segmentation and clustering. Different methods exploit different features in the data to reduce dimensionality. Principle component Analysis is one such method …
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PROBING BAND MAGNETISM IN DIFFERENT DIMENSIONS: ENERGY, SPIN AND TIME-RESOLVED STUDIES
… and spin properties of systems with decreasing dimensionality. This programme has been conducted by exploiting state-of-the-art infrastructures to generate visible, UV and EUV ultrashort pulses (tabletop lasers and HHG at NFFA-SPRINT laboratory) and soft X-ray synchrotron light (at Elettra, …
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Bayesian Multidimensional Scaling Model for Ordinal Preference Data
… dissimilarity preference data matrix within a reduced dimensionality. This depiction would aim to enable interpretation of the preference structure underlying the data and potential demand for each product. Model simulations were created both from sampling the normal distribution, as well as …
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Comparative Analysis of Machine Learning Algorithms on Activity Recognition from Wearable Sensors’ MHEALTH dataset Supported with a Comprehensive Process and Development of an Analysis Tool
… Beside using original MHEALTH data as input, reduced dimensionality subsets and reduced features subsets were also analysed. The comparison is made on overall accuracies, class-wise sensitivity and specificity of each algorithm, class-wise detection rate and detection prevalence in comparison …
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Własności antybiotyku (ciprofloksacyny) uwięzionego w nanotubach węglowych. Właściwości antybakteryjne układu
… the strong influence of surface forces and the reduced dimensionality of the system, the behavior of the system is different from the macroscopic scale. Ciprofloxacin adsorbed in carbon nanotubes has a longer-term effect, and the decreased bacterial adhesion leads to an increase in antibacterial …
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Algorithmic enhancements to polynomial matrix factorisations
… to convert the sequential form of SMD to a novel reduced dimensionality and partially parallelisable divide-and-conquer architecture. The resulting algorithms are shown to converge an order of magnitude faster than existing methods for large spatial dimensions, and are well-suited to application …
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Variable selection for wind turbine condition monitoring and fault detection system
… of variable selection algorithm, such that the dimensionality of the monitoring data can be reduced, while useful information in relation to the later fault diagnosis and prognosis is preserved. The research started with a background and review of the current status of CMS in wind energy. Then, …
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Comparative Analysis of Machine Learning Algorithms on Activity Recognition from Wearable Sensors’ MHEALTH dataset Supported with a Comprehensive Process and Development of an Analysis Tool
… Beside using original MHEALTH data as input, reduced dimensionality subsets and reduced features subsets were also analysed. The comparison is made on overall accuracies, class-wise sensitivity and specificity of each algorithm, class-wise detection rate and detection prevalence in comparison …
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Terrain characterization for site selection and preparation
… predicted with greater accuracy by reducing the dimensionality of a hyperspectral dataset to resemble a standard multispectral dataset. The ET model produced better estimations of SMC when trained with the reduced dimensionality (RD) input set and concatenated multispectral (CM) set – obtaining …
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Electrostatic effects of inhomogeneous strain in monolayer transition metal dichalcogenides
… thick, exhibiting novel properties due to their reduced dimensionality. Strain engineering can be used to modify optical and electronic properties, and highly inhomogeneous strain distributions in two-dimensional materials can be easily realized, allowing for their properties to be tuned on the …
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Graph-Based Acoustic Clustering and Classification
… showing how its output can construct a novel reduced-dimensionality representation of the data. Based on this, we propose a semi-supervised extension of the method. Finally, we evaluate the effectiveness of our methodology on problems of classifying vehicles based on roadside microphone …
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Pyrochlore spin ice Dy2Ti2O7: Investigating a platform for magnetic monopolar quasiparticles
… by similar methods to demonstrate the impact of reduced dimensionality on a three-dimensional magnetically ordered state. Finally, an experimental probe of the monopolar quasiparticle behavior using SQUID magnetometry has been created."
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Temporal characterization of patient state with applications to prediction of tachycardia in anesthesia via induction of inhaled desflurane
… novel way to consider patient state by utilizing reduced dimensionality and by estimating noise. It then explores an application, namely prediction of tachycardia, which often occurs at the onset of induction of inhaled desflurane. One unexpected initial finding was that all 46 patients exhibited …
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Transmission Electron Microscopy Of Structural Disorder In Two-Dimensional Materials
… systems down to the single-atom level. The reduced dimensionality of these systems provides a two-fold opportunity: first, 2D materials serve as model systems for exploring direct correlations between the structure and properties of individual atomic features. Second, these studies enable …
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Single-crystal metal oxides and supported metal nanoclusters as model catalyst sytems
… by final-state effects that arise from the reduced dimensionality of the smallest clusters (one or two Au layers). A similar morphology for Au deposited on ZnO(10-10) has been previously observed; however, we find that the Au-ZnO interaction instead results in positively charged clusters. Cu …
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Thermodynamic and neutron scattering study of the spin- 1/2 kagome antiferromagnet ZnCu₃(OH)₆Cl₂ : a quantum spin liquid system
… where quantum fluctuations are enhanced due to reduced dimensionality and strong frustration. The realization of a quantum spin liquid in two-dimensions would represent a new state of matter. It is believed that spin liquid physics plays a role in the phenomenon of high-Tc superconductivity, and …
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High-pressure studies of atomically-thin van der Waals materials
… due the emergent properties associated to their reduced dimensionality and tunability. To glean insight into the physics of these atomically-thin van der Waals materials, their properties have been extensively studied by tuning of external parameters such as temperature, electrostatic doping, …
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