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 60 for “"whitening"”.
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Concurrent Whitening and Orthodontic Treatment
The aim was to evaluate whether a whitening system, when used during the final stages of orthodontics, would yield results comparable to whitening alone. Patients were assigned to either the control (n=20) or experimental (n=26) groups. At T1, patients were given a ten day supply of Trèswhiteâ„¢ …
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A CMA-FRESH Whitening Filter for Blind Interference Rejection
… a frequency-shift (FRESH) filter which acts as a whitening filter, canceling the interference by exploiting its cyclostationarity. It learns the cyclostationary characteristics of the interferer blindly, through a property restoration algorithm which aims to drive the spectrum to white noise. The …
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The fate of fluorescent whitening agents in the aquatic environment
The commercial use of fluorescent whitening agents (FWA' s) in products such as soaps and detergents has resulted in the presence of these compounds in domestic waste waters.<br/><br/>A model compound (A) (a possible initial degradation product of a stilbene-s-triazine type FWA) was synthesised and …
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Caracterização do efeito whitening em polifluoreto de vinilideno (PVDF) por ensaio ultrassônico
… of these opaque regions is known as stress whitening. This study was intended to characterize qualitatively and quantitatively the whitening effect of polyvinylidene fluoride (PVDF) samples using the ultrasound test. Therefore, the techniques which used were the measurements of sonic …
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Efeito do envelhecimento e da geração de “whitening” no comportamento mecânico do PVDF
… acting as sealing layer. One effect named whitening can appear in the material, being characterized by the formation of whitened regions and is associated with cavitation process (growth of microvoids). This work has the objective of studying the effect of PVDF aging in petroleum during 30, …
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Biologically inspired feature extraction for rotation and scale tolerant pattern analysis
… network response is steerable. The decorrelating/whitening characteristics of networks with lateral inhibition are used in order to develop space invariant pre-whitening kernels specialized for specific category of input signals. These filters have extremely small memory footprint and are …
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Rate and time dependent behavior of structural adhesives
… Further it is shown that a rate dependent stress-whitening (crazing) phenomenon occurs prior to the maximum stress. A region of elastic behavior, a rate and time dependent region, and a region of perfectly plastic flow are identified in the stress-strain behavior. Information regarding variations …
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Validation of statistical methods used in task fMRI studies
… correction, registration to common space, pre-whitening, hemodynamic response function modelling and multiple comparison correction. As most of these methods were introduced when fMRI was in its infancy, and were initially validated only for small datasets, it is questionable whether the …
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Reflection seismic data acquisition and processing for enhanced interpretation of high resolution objectives
… filtering associated with the array response. Whitening of the signal bandwidth was accomplished using Vibroseis whitening (VSW) and stretched automatic gain control (SAGC). A zero-phase wavelet-shaping filter was used to optimize the waveform length allowing a thinner depositional sequence to …
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Blind separation of noisy multivariate data using second-order statistics
… experiments. To reduce sensitivities in the pre-whitening step of these algorithms, a heuristic is proposed by this thesis for whitening the data set; it is shown to improve separation performance. Additionally the application of blind source separation techniques to remote sensing data is …
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Capillary Force in High Aspect-Ratio Micropillar Arrays
… of the clustered micropillar arrays as ultrathin whitening layers mimicking the structural whitening mechanism found in some insects in nature. Finally, we have theoretically studied the capillary force induced imbibition of a liquid droplet on a model rough surface consisting of micropillar …
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Deciphering pH Effects on the Peptide-guided Nucleation and Growth of Hydroxyapatite and Peptide-Ion Interactions for Dentin Hypersensitivity Treatment
… of a market introductory remineralizing tooth whitening dental product in the form of a lozenge as a delivery mechanism for remineralization in the oral cavity. This work was only limited to a constant saliva temperature and pH. Saliva pH is variable and dynamic and can alter hydroxyapatite …
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Models and methods for computationally efficient analysis of large spatial and spatio-temporal data
… removing orthonormal transformation named "pre-whitening" is described. This transformation is based on a singular value decomposition and results in the removal of spatial structure from the data. Circulant embedding technique further simplifies the calculation of eigenvalues and eigenvectors …
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Influence of a bleaching agent on stained direct composite resins
… tooth bleaching has over 90% success rates in whitening discoloured teeth and this may be an alternative treatment modality for discoloured composite resins. Aim: The aim of this study was to determine whether tooth bleaching agents alter the colour of stained direct composite resins. Material …
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Dissecting NAMPT Signaling Pathways in Beige Adipocyte Development, Impairment and Maintenance
… display substantial plasticity and undergo “whitening” during aging, overnutrition, and thermoneutrality. The NAD(^+) biosynthetic enzyme nicotinamide phosphoribosyltransferase (NAMPT) regulates cellular stress responses and immune–metabolic crosstalk, yet its roles in thermogenic adipocyte …
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Influence of low frequencies on seismic impedance inversion
… different smoother types and correcting the whitening error of deconvolution operator using color operator. At the end, the maximum correlation results between acoustic impedance inversion and well impedance demonstrate using color operator can increase the maximum correlation by around 20 …
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Signal detection in fractional Gaussian noise and an RKHS approach to robust detection and estimation
… interval (0,T) is given. Infinite-interval whitening filters for fractional Brownian motion are also developed. Application of these results to the signal detection problem yields necessary and sufficient conditions for a deterministic or stochastic signal to produce a nonsingular shift when …
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Improving performance for adaptive filtering with voice applications
… components: a modeling filter and a noise whitening filter. The proposed method performs better than the conventional LMS and RLS algorithms both in convergence speed and misadjustment factor. The performance of the adaptive filter when updated using LMS is observed. The improvement factor …
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X-ray periodicities in sources observed by the RXTE ASM
… the Fast Fourier Transform on the ASM data and whitening the resulting power density spectrum using a local averaging technique. A power threshold was set to determine the statistical significance of a peak in the power density spectrum. The search verified the orbital frequencies of four known …
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