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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.
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 ...
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 ...
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.
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 ...
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 ...
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, ...
Ultra low frequency yeast cells electric activity
Cifra, Michal; Pokorný, Jiří; Jelínek, František; Hašek, Jiří; Šimša, Jan
2008 - English
This paper presents results from the measurement of the electrical activity cold sensitive beta-tubulin mutant tub2-401 of yeast cells in frequency region 0.4 - 1.6 kHz. 25 measurements of both synchronized and nonsynchronized cells show that the synchronized cells have higher electrical activity what corresponds to the findings of Pohl et al. Mechanical oscillations of electrically polar structures in cell may give rise to electric oscillations we measured.
Keywords:
bioelectric phenomena; cellular biophysics; biomembranes
Available at various institutes of the ASCR
Ultra low frequency yeast cells electric activity
This paper presents results from the measurement of the electrical activity cold sensitive beta-tubulin mutant tub2-401 of yeast cells in frequency region 0.4 - 1.6 kHz. 25 measurements of both ...
DS-CDMA signal blind MMSE detector adaptation
Šimša, Jan
2008 - English
The contribution is focused on multiusxer detection of code-division multiplexewd signals-directsequnce CDMA. A very efficient detection of an ińdividual signal within synchronous CDMA mitigating multiuser interference as well as addditive noise is MMSE multiuser detection.
Keywords:
multiuser detector; MMSE adaptive detector
Available at various institutes of the ASCR
DS-CDMA signal blind MMSE detector adaptation
The contribution is focused on multiusxer detection of code-division multiplexewd signals-directsequnce CDMA. A very efficient detection of an ińdividual signal within synchronous CDMA mitigating ...
Estimation of energy transfer parameters in thulium- and ytterbium-doped silica fibers
Peterka, Pavel; Blanc, W.; Dussardier, B.; Monnom, G.; Simpson, D. A.; Baxter, G.
2008 - English
We present an estimation of the energy transfer coefficients by comparison of the measured emission of three TYDF samples with numerical simulations of the respective emission. The energy transfer coefficients were found higher than those reported in Tm/Yb-doped fluoride based crystals. With possible improvement of excited level lifetime of thulium by high alumina codoping, it makes Tm/Yb co-doped silica fibers promising for applications in fiber lasers and amplifiers.
Keywords:
fiber lasers; thulium; fluorescence lifetime
Available at various institutes of the ASCR
Estimation of energy transfer parameters in thulium- and ytterbium-doped silica fibers
We present an estimation of the energy transfer coefficients by comparison of the measured emission of three TYDF samples with numerical simulations of the respective emission. The energy transfer ...
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