an efficient synthesis of trialkyl (e)-3-(3-oxo-2-3,4-dihydro-2-(1h)-quinoxalinylidene)-prop-1-ene-1,2,3-tricarboxylate derivatives via a simple three-component reaction between benzene-1,2-diamines with dialkyl acetylenedicarboxylates in the presence of k2co3-peg catalytic system at 100 oc was reported. the desired products were obtained in excellent yields (88-92%). various benzene-1,2-diamin...

Recently, nanoparticle (NP) synthesis has evolved into a green nanotechnology field, requiring more methods for the eco-synthesis of nanoparticles due to high costs other chemical–physical methods.

This paper summarises work on ‘xenophones’ (foreign sounds) carried out at Telia Research. The inclusion of “foreign” sounds in Swedish is described, as well as their implications on speech recognition and speech synthesis. Results from two earlier studies are summarised and described: the nature of the expansion of what is normally regarded as the Swedish phone set, and the nature of some poss...

Life could not exist without motion induced by a variety of molecular motors. The construction of artificial motors by chemical synthesis, which can power motions that lead to macroscopic detectable effects in a system, is a major endeavor in contemporary science. To move toward this goal, a host-guest system, composed of a nematic liquid crystal film doped with a chiral light-driven molecular ...

A flexible analysis—synthesis system with signal dependent features is described and used to realize some desired voice characteristics insynthesized speech. The intelligibility of synthetic speech appears to depend on the ability to reproduce dynamic sounds such as stops, whereas the quality of voice is mainly determined by the true reproduction of voiced segments. We describe our work in conv...

The considerable development of science and technology in the XXth century has put many new tools at the disposal of the musican -intellectual tools as well as material tools. Sounds and images as well can now be synthesized. The process of synthesis is completely unprecedented : visual and auditory signals can be calculated altogether. This brings considerable changes not only to the generatio...

Text-to-speech systems convert text into speech. Synthesized speech without prosody sounds unnatural and monotonous. In order to sound natural, prosodic elements have to be implemented. The generation of prosodic elements directly from text is a rather demanding task. Our final goals are building a complete prosodic model for Croatian and implementing it into our TTS system. In this work, we pr...

Coarticulation in speech production is a phenomenon in which the articulator movements for a given speech sound vary systematically with the surrounding sounds and their associated movements. Although these variations may appear to be centrally planned, without explicit models of the speech articulators, the kinematic patterns which are attributable to central control cannot be distinguished fr...

Synthetic photochemistry carried out in classic batch reactors has, for over half a century, proved to be a powerful but under-utilised technique in general organic synthesis. Recent developments in flow photochemistry have the potential to allow this technique to be applied in a more mainstream setting. This review highlights the use of flow reactors in organic photochemistry, allowing a compa...

Remarkable site-specificity in the resonant attachment of low energy electrons (LEEs) to molecular targets is proposed as an efficient method for inducing chemical reactivity on specific sites of molecules. The Coulomb interaction between the attached electron and the most polarizable molecular electrons localized on the attached site is the reason for site-specific chemical reactivity. The Cou...