Number of found documents: 375
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Speech processing
Vích, Robert
2009 - English
Proceedings of the Workshop on Speech Processing is a periodic publication collecting the contributions presented at the Czech-German Workshop organized every year in September in Prague This proceedings volume includes 22 papers by 45 authors. Papers are devoted to phonetics and prosody, construction of dialogs, speech analysis, synthesis and enhancement, speaker and speech recognition and voice conversion. Keywords: speech analysis; Speech synthesis Available at various institutes of the ASCR
Speech processing

Proceedings of the Workshop on Speech Processing is a periodic publication collecting the contributions presented at the Czech-German Workshop organized every year in September in Prague This ...

Vích, Robert
Ústav fotoniky a elektroniky, 2009

Films of Metal Nanoparticles Deposited on Semiconductors by Electrophoresis: Technology and Characterization
Žďánský, Karel; Zavadil, Jiří; Kacerovský, Pavel; Kostka, František; Lorinčík, Jan; Černohorský, O.; Fojtík, A.; Müller, M.; Kostejn, M.
2009 - English
Layers of nanoparticles in micelle enclosures were deposited on InP substrates by electrophoresis from isooctane colloid solutions containing Pd or Ag nanoparticles. The layers were investigated by SIMS, low-temperature photoluminescence spectroscopy and topography, absorption spectroscopy, Raman spectroscopy and sensitivity to hydrogen. Photoluminescence of InP was enhanced by the layers of Pd or Ag nanoparticles. Schottky barriers made on the n-type InP with layers containing Pd nanoparticles showed significant sensitivity to hydrogen in contrast to those containing Ag nanoparticles. Keywords: semiconductor devices; nanostructures; sensors Available at various institutes of the ASCR
Films of Metal Nanoparticles Deposited on Semiconductors by Electrophoresis: Technology and Characterization

Layers of nanoparticles in micelle enclosures were deposited on InP substrates by electrophoresis from isooctane colloid solutions containing Pd or Ag nanoparticles. The layers were investigated by ...

Žďánský, Karel; Zavadil, Jiří; Kacerovský, Pavel; Kostka, František; Lorinčík, Jan; Černohorský, O.; Fojtík, A.; Müller, M.; Kostejn, M.
Ústav fotoniky a elektroniky, 2009

GROWTH OF InP CRYSTALS WITH RARE-EARTH ELEMENTS
Yatskiv, Roman; Grym, Jan; Žďánský, Karel; Pekárek, Ladislav; Zavadil, Jiří
2009 - English
We report on the influence of rare earth (RE) elements (Pr, Er, and Dy) addition during vertical Bridgman low pressure synthesis on the properties of InP crystals. The temperature dependent Hall measurement and low temperature photoluminescence (PL) spectroscopy were employed to study the changes in electrical and optical properties of the crystals. The observed changes are attributed to the gettering effect of REs caused by the high affinity of REs towards shallow impurities in InP. Keywords: Rare-earth elements; Crystals growth; InP Available at various institutes of the ASCR
GROWTH OF InP CRYSTALS WITH RARE-EARTH ELEMENTS

We report on the influence of rare earth (RE) elements (Pr, Er, and Dy) addition during vertical Bridgman low pressure synthesis on the properties of InP crystals. The temperature dependent Hall ...

Yatskiv, Roman; Grym, Jan; Žďánský, Karel; Pekárek, Ladislav; Zavadil, Jiří
Ústav fotoniky a elektroniky, 2009

Control system of the Heat Flux furnace
Kostka, František; Zelinka, Jiří; Kostka, Petr; Houška, Zdeněk; Zavadil, Jiří; Starý, Robert; Krechler, Jindřich; Žďánský, Karel
2008 - English
A control system for a two-crucible furnace for DTA has been designed and realized. Samples of heavy metal oxide glasses have been analysed by the system. Keywords: control systems; Furnace; Differential thermal analysis Available at various institutes of the ASCR
Control system of the Heat Flux furnace

A control system for a two-crucible furnace for DTA has been designed and realized. Samples of heavy metal oxide glasses have been analysed by the system.

Kostka, František; Zelinka, Jiří; Kostka, Petr; Houška, Zdeněk; Zavadil, Jiří; Starý, Robert; Krechler, Jindřich; Žďánský, Karel
Ústav fotoniky a elektroniky, 2008

LPE Growth of III-V Semiconductors from rare-earth Treated Melts
Grym, Jan; Procházková, Olga; Zavadil, Jiří; Žďánský, Karel
2008 - English
We focus on the characterization of InP and InGaAsP layers prepared by liquid phase epitaxy with rare-earth admixtures. We applied photoluminescence spectroscopy (PL), capacitance-voltage measurements, and secondary ion mass spectroscopy in order to explain: (i) the gettering effect and conductivity crossover of InP layers for Pr treated samples, (ii) narrowing of the PL and elecroluminescent spectra of the active InGaAsP region of a double-heterostructure LED. Keywords: semiconductor technology; rare earth elements; III-V semiconductors Available at various institutes of the ASCR
LPE Growth of III-V Semiconductors from rare-earth Treated Melts

We focus on the characterization of InP and InGaAsP layers prepared by liquid phase epitaxy with rare-earth admixtures. We applied photoluminescence spectroscopy (PL), capacitance-voltage ...

Grym, Jan; Procházková, Olga; Zavadil, Jiří; Žďánský, Karel
Ústav fotoniky a elektroniky, 2008

Measurement of electrical and mechanical oscillations of yeast cells membrane in acoustic frequency range
Jelínek, František; Pokorný, Jiří; Vaniš, Jan; Hašek, Jiří; Šimša, Jan
2008 - English
The paper describes the measurement of electric activity of yeast cells at frequencies around 1 kHz and of mechanical vibrations of cell membrane. Synchronized and non-synchronized tubulin mutants of yeast cells were measured. The paper includes a description of the laboratory equipment with a platinum wire point sensor and a spectrum analyzer. Obtained results are in good agreement with AFM findings. Keywords: Cellular Biophysics; Electromagnetic Fields Available at various institutes of the ASCR
Measurement of electrical and mechanical oscillations of yeast cells membrane in acoustic frequency range

The paper describes the measurement of electric activity of yeast cells at frequencies around 1 kHz and of mechanical vibrations of cell membrane. Synchronized and non-synchronized tubulin mutants of ...

Jelínek, František; Pokorný, Jiří; Vaniš, Jan; Hašek, Jiří; Šimša, Jan
Ústav fotoniky a elektroniky, 2008

Introduction to confocal microscopy, 3D imaging with Leica SPE
Pala, Jan; Krist, P.; Sendrowski, P.
2008 - English
The article deals with the contemporary state of art of confocal microscopy. Článek pojednává o současném stavu konfokální mikroskopie. Keywords: microscopy; diffraction; laser beams Available at various institutes of the ASCR
Introduction to confocal microscopy, 3D imaging with Leica SPE

The article deals with the contemporary state of art of confocal microscopy.


Článek pojednává o současném stavu konfokální mikroskopie.

Pala, Jan; Krist, P.; Sendrowski, P.
Ústav fotoniky a elektroniky, 2008

Growth of InP crystals for radiation detectors and other application
Pekárek, Ladislav; Yatskiv, Roman
2008 - English
Bulk InP single crystals were grown by Czochralski method. Various dopants were added to the melt to obtain single crystals suitable for radiation detectors and other application. The intentionally doped of InP crystals were characterized by measurements of resistivity and Hall coefficient. Prototype detectors were prepared and evaluated by spectral detection of alpha particles and x-rays. Keywords: crystal growth; radiation detector; InP Available at various institutes of the ASCR
Growth of InP crystals for radiation detectors and other application

Bulk InP single crystals were grown by Czochralski method. Various dopants were added to the melt to obtain single crystals suitable for radiation detectors and other application. The intentionally ...

Pekárek, Ladislav; Yatskiv, Roman
Ústav fotoniky a elektroniky, 2008

Proceedings of Advances in Widefield and Confocal Fluorescence Microscopy
Pala, Jan
2008 - English
Workshop in Ljubljana was focused on major aspects of contemporary widefield and confocal fluorescence microscopy. It covered topics from basic technical background of high-end optical microscopy to the most sophisticated applications. Workshop v Ljubljani byl zaměřen na hlavní oblasti současné nekonfokální a konfokální fluorescenční mikroskopie. Přednášky začínaly od základního technického pozadí pokročilé optické mikroskopie až po nejsložitější aplikace. Keywords: optical microscopy; fluorescence; laser beams Available at various institutes of the ASCR
Proceedings of Advances in Widefield and Confocal Fluorescence Microscopy

Workshop in Ljubljana was focused on major aspects of contemporary widefield and confocal fluorescence microscopy. It covered topics from basic technical background of high-end optical microscopy to ...

Pala, Jan
Ústav fotoniky a elektroniky, 2008

Application of speech recognition and rhyme tests for assessement of Czech speech processing systems
Vích, Robert; Nouza, Jan
2008 - English
Speech intelligibility is the most important parameter of speech quality. In the contribution a new objective intelligibility assessment of speech processing algorithms, e.g., speech coding, synthesis, enhancement, conversion, is proposed. It is based on automatic speech recognition of rhyme tests. The idea is illustrated by comparison with listening evaluation of Czech rhyme tests and is applied for intelligibility assessment of Czech text-to-speech system and voice conversion. Srozumitelnost řeči je nejdůležitější ukazatel kvality řeči. V příspěvku je popsán návrh nového objektivního hodnocení srozumitelnosti algoritmů pro zpracování řeči, např. kódování, syntézy, zvýrazňování a konverse řeči. Je založen na automatickém rozpoznávání rýmových testů. Myšlenka je ilustrována porovnáním s poslechovým hodnocením českých rýmových testů a je použita na hodnocení srozumitelnosti českého systému pro převod textu na řeč a pro konversi hlasu. Keywords: speech processing; speech synthesis; speech recognition Available at various institutes of the ASCR
Application of speech recognition and rhyme tests for assessement of Czech speech processing systems

Speech intelligibility is the most important parameter of speech quality. In the contribution a new objective intelligibility assessment of speech processing algorithms, e.g., speech coding, ...

Vích, Robert; Nouza, Jan
Ústav fotoniky a elektroniky, 2008

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