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Unnaturally sounding speech prevents the listeners from recognizing the message of the signal. In this paper we demonstrate how a precise initial phase approximation can improve the naturalness of artificially generated speech. Using the Harmonic plus Noise Model provided by Stylianou as a framework for a Hungarian speech synthesis, the exact initial phase extension of the system can be easily performed. The proposed method turns out to be more effective in preserving the sound characteristics and quality than the original one.

Hungarian speech synthesis using a phase exact ..

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as a framework for a Hungarian speech synthesis, the exact initial phase extension of the ..

The pioneering Brust's synthesis [] of thiol-derivatized gold nanoparticles in a two-phase liquid-liquid system allowed obtaining stable self-assembled monolayers. Thiol surfactant imparted stability to nanoparticles without coagulation or loss of solubility, even after several months of storage in air at room temperature. The size, shape, surface functionality, and solubility of the nanoparticles could also be tailored. Since the formation of gold nanoparticles is thermodynamically favorable, the gold/solution interfacial energy is lowered by the chemisorption of a thiol monolayer onto the surface of the gold nanoparticles [, ].

Gold nanoparticles stabilized with benzylthiol have been synthesized by means of the modified Brust's two-phase procedure [], with Au/S ratios 0.75:1 (sample A1), 1.5:1 (sample A2), 6:1 (sample A3), 15:1 (sample A4).

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Scheme 1. Reaction scheme of the modified two-phase synthesis, based on the Brust's procedure, to obtain benzylthiol-capped gold nanoparticles (synthesis i, sample A).

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Stable gold nanoparticles stabilized by different mono and bi-functional arenethiols, namely, benzylthiol and 1,4-benzenedimethanethiol, have been prepared by using a modified Brust's two-phase synthesis. The size, shape, and crystalline structure of the gold nanoparticles have been determined by high-resolution electron microscopy and full-pattern X-ray powder diffraction analyses. Nanocrystals diameters have been tuned in the range 2 ÷ 9 nm by a proper variation of Au/S molar ratio. The chemical composition of gold nanoparticles and their interaction with thiols have been investigated by X-ray photoelectron spectroscopy. In particular, the formation of networks has been observed with interconnected gold nanoparticles containing 1,4-benzenedimethanethiol as ligand.

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AB - Unnaturally sounding speech prevents the listeners from recognizing the message of the signal. In this paper we demonstrate how a precise initial phase approximation can improve the naturalness of artificially generated speech. Using the Harmonic plus Noise Model provided by Stylianou as a framework for a Hungarian speech synthesis, the exact initial phase extension of the system can be easily performed. The proposed method turns out to be more effective in preserving the sound characteristics and quality than the original one.

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The synthesis of gold nanoparticles passivated by BDMT was performed using the Au/S ratio 0.75:1, sample B. HAuCl4·3H2O (tetrachloroauric acid, 0.175 g, 0.44 mmol) was dissolved in 15 ml of H2O and added to a solution of BDMT (0.999 g, 0.58 mmol) in 40 ml of CH2Cl2. The aqueous phase was transferred into CH2Cl2 upon addition of 0.800 g of TOAB, and the mixture was subjected to vigorous stirring. The gold was reduced upon addition of 11.15 ml of a 0.4 M aqueous solution of NaBH4, added over a period of 1 min to the vigorously stirring solution. The solution was left stirring for a further 3 h. The solvent was then removed in vacuum, the product was dried in a desiccator overnight and recovered without any further purification because a film over Celite was formed that could not be removed with CH2Cl2. The reaction scheme leading to the 1,4-benzenedimethanethiol-capped gold nanoparticles is shown in Scheme 2 (Figure , sample B; here only two nanoclusters linked by one bi-functional thiol molecule are shown).

Research Themes: - University of Manchester

The modified two-phase synthesis procedure, reported in Scheme 1 (Figure ), was applied to produce benzylthiol-protected gold nanoparticles. As a comparison, the same thiol was used in a one-phase reaction scheme (synthesis ii), in analogy to what reported in the literature for similar compounds []. In general a better performance of the reaction, in term of quality of nanoparticles products, was observed with the two-phase reaction (synthesis i) and different Au/S molar ratios were tested in order to achieve a fine tuning of the nanoparticles sizes. As it can be observed, when the Au/S molar ratio increases, the mean diameter of the nanoparticles increases.

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The benzylthiol-capped gold nanoparticle diameter versus the Au/S molar ratio ( r ) as prepared by the one-phase synthesis (open circles) and the modified two-phase synthesis (filled squares).

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The average diameter of the dodecanethiol (DdT, filled triangles) and benzylthiol (BzT, open circles) functionalized gold nanoparticles versus the Au/S molar ratio ( r ) by using the one-phase synthesis.

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N2 - Unnaturally sounding speech prevents the listeners from recognizing the message of the signal. In this paper we demonstrate how a precise initial phase approximation can improve the naturalness of artificially generated speech. Using the Harmonic plus Noise Model provided by Stylianou as a framework for a Hungarian speech synthesis, the exact initial phase extension of the system can be easily performed. The proposed method turns out to be more effective in preserving the sound characteristics and quality than the original one.

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