Number of found documents: 623
Published from to

Applications of porous III-V semiconductors in heteroepitaxial growth and in preparation of nanocomposite structures
Nohavica, Dušan; Grym, Jan; Gladkov, Petar; Hulicius, Eduard; Pangrác, Jiří
2011 - English
We investigate the concept of epitaxial growth on porous substrates Both crystalographically oriented and current line oriented pore networks in InP and GaAs were created by electrochemical dissolution. Heat treatment of InP pores at 650 ºC and GaAs pores at 700-850ºC converted them into microcavities. The capability of improved structural quality homo- and hetero-epitaxially overgrown films is demonstrated on InAs and GaInAs layers with a different composition grown on porous GaAs substrates Keywords: porous semiconductors; heterotransitions; electrochemical etching of metals Available at various institutes of the ASCR
Applications of porous III-V semiconductors in heteroepitaxial growth and in preparation of nanocomposite structures

We investigate the concept of epitaxial growth on porous substrates Both crystalographically oriented and current line oriented pore networks in InP and GaAs were created by electrochemical ...

Nohavica, Dušan; Grym, Jan; Gladkov, Petar; Hulicius, Eduard; Pangrác, Jiří
Ústav fotoniky a elektroniky, 2011

Přenos přesného času pomocí družicových systémů
Pánek, Petr
2010 - Czech
Článek se zabývá využitím družicových navigačních systémů pro přenos přesného času. Popisuje jevy, které tento přenos času ovlivňují a uvádí příklady výsledků měření. The paper deals with the use of the satellite navigation systems for a precise time transfer. Effects affecting the time transfer are described and examples of measurement results are presented. Keywords: time measurement; satellite navigation; měření času Available at various institutes of the ASCR
Přenos přesného času pomocí družicových systémů

Článek se zabývá využitím družicových navigačních systémů pro přenos přesného času. Popisuje jevy, které tento přenos času ovlivňují a uvádí příklady výsledků měření....

Pánek, Petr
Ústav fotoniky a elektroniky, 2010

Analysis of spectral changes in speech affected by orthodontic appliances
Přibil, Jiří; Přibilová, Anna
2010 - English
This paper is focused at investigation of influence of the upper removable plate and the lower fixed orthodontic brackets and their combination on spectral properties of produced speech. Spectral changes were analyzed and evaluated by spectrograms and mean Welch’s periodograms. From obtained results follows that the removable orthodontic appliance mainly affects spectrograms of speech, and these changes are most significant in voiced parts of spectrograms – corresponding to vowels, voiced consonants etc. Keywords: Signal processing; Speech analysis; zpracování signálů Available at various institutes of the ASCR
Analysis of spectral changes in speech affected by orthodontic appliances

This paper is focused at investigation of influence of the upper removable plate and the lower fixed orthodontic brackets and their combination on spectral properties of produced speech. Spectral ...

Přibil, Jiří; Přibilová, Anna
Ústav fotoniky a elektroniky, 2010

GLOTTAL SIGNAL MODIFICATION FOR EMOTIONAL SPEECH SYNTHESIS
Vondra, Martin; Vích, Robert
2010 - English
In the contribution speech decomposition into the source and vocal tract components is described. It is based on separation of the signal into the minimum- and maximum-phase speech components. Further the modification of the source speech component by changing the glottal model parameters is applied in order to achieve emotional speech by change of the neutral speech style Keywords: analysis of speech; speech synthesis; syntéza řeči Available at various institutes of the ASCR
GLOTTAL SIGNAL MODIFICATION FOR EMOTIONAL SPEECH SYNTHESIS

In the contribution speech decomposition into the source and vocal tract components is described. It is based on separation of the signal into the minimum- and maximum-phase speech components. Further ...

Vondra, Martin; Vích, Robert
Ústav fotoniky a elektroniky, 2010

PD NANOLAYERS FOR HYDROGEN SENSORS
Yatskiv, Roman; Žďánský, Karel; Grym, Jan; Piksová, K.
2010 - English
We presented study nanoparticle layers created by electrophoretic deposition. A possibility of using Pd nanolayers for the formation of Schottky barriers with a large Schottky barrier height (SBH) value on n-type tin doped InP is proposed together with its potential application in high-sensitive hydrogen sensors. Keywords: Nanoparticles; Schottky barriers; Hydrogen sensor Available at various institutes of the ASCR
PD NANOLAYERS FOR HYDROGEN SENSORS

We presented study nanoparticle layers created by electrophoretic deposition. A possibility of using Pd nanolayers for the formation of Schottky barriers with a large Schottky barrier height (SBH) ...

Yatskiv, Roman; Žďánský, Karel; Grym, Jan; Piksová, K.
Ústav fotoniky a elektroniky, 2010

IMPROVING UNIT CONCATENATIONS IN EXPERIMENTAL SPEECH SYNTHESIS BASED UPON COMPLEX CEPSTRUM IN THE CONCATENATION-BASED TTS SYSTEM EPOS
Staněk, Jan
2010 - English
During testing phase of a new speech analysis and synthesis methods based upon complex cepstrum and implemented in a TTS system Epos, we have discovered disturbing speech artifacts on the borders of the concatenated units. To eliminate these artifacts, we have chosen to practically implement and test usage of smoothing algorithms in the cepstral domain and observe its impact on the resulting synthesized speech. The results of our tests are presented in this paper. Keywords: analysis of speech; speech synthesis; syntéza řeči Available at various institutes of the ASCR
IMPROVING UNIT CONCATENATIONS IN EXPERIMENTAL SPEECH SYNTHESIS BASED UPON COMPLEX CEPSTRUM IN THE CONCATENATION-BASED TTS SYSTEM EPOS

During testing phase of a new speech analysis and synthesis methods based upon complex cepstrum and implemented in a TTS system Epos, we have discovered disturbing speech artifacts on the borders of ...

Staněk, Jan
Ústav fotoniky a elektroniky, 2010

Electromagnetic-based nano-resolution microscopies for biological research
Kučera, Ondřej; Cifra, Michal
2010 - English
Research of cell biology is principally related to progress in imaging under diffraction limit of visible light and to the functional imaging. This paper brings short review of experimental techniques including Photonic force microscopy, Scanning microwave microscopy and other relevant techniques. The possibility of employing these techniques for elucidation of endogenous biological electromagnetic activity is discussed Keywords: Cellular electromagnetic field; Microscopy Available at various institutes of the ASCR
Electromagnetic-based nano-resolution microscopies for biological research

Research of cell biology is principally related to progress in imaging under diffraction limit of visible light and to the functional imaging. This paper brings short review of experimental techniques ...

Kučera, Ondřej; Cifra, Michal
Ústav fotoniky a elektroniky, 2010

Notes to multistage Wiener filter in DS-CDMA detector
Šimša, Jan
2010 - English
The contribution follows report oriented towards design of Wiener filter in DS-CDMA detector of signals as a multistage structure. Such approach avoids evaluation of the inverse of a known autocorrelation matrix of a sampled response of the chip matched filter to a wide-sense stationary input signal. The contribution gives more detailed description of detector signal processing and its consequences. Keywords: CDMA; multiuser detector; interference; mobilní telefony; interference Available at various institutes of the ASCR
Notes to multistage Wiener filter in DS-CDMA detector

The contribution follows report oriented towards design of Wiener filter in DS-CDMA detector of signals as a multistage structure. Such approach avoids evaluation of the inverse of a known ...

Šimša, Jan
Ústav fotoniky a elektroniky, 2010

Surface plasmon resonance biosensors: present and future
Homola, Jiří
2010 - English
Optical biosensors based on the surface plasmon resonance (SPR) have become important tool for real-time study of biomolecular interactions and for detection of various analytes in fields such as food safety, medical diagnostics, or environmental monitoring. This paper reviews the present state of the art in the development of SPR sensor technology, discusses emerging trends, and presents selected results of research into SPR sensors at the Institute of Photonics and Electronics, Prague. Keywords: Surface plasmon resonance imaging; Biosensor; Protein detection; rezonance; povrch Available at various institutes of the ASCR
Surface plasmon resonance biosensors: present and future

Optical biosensors based on the surface plasmon resonance (SPR) have become important tool for real-time study of biomolecular interactions and for detection of various analytes in fields such as food ...

Homola, Jiří
Ústav fotoniky a elektroniky, 2010

Vláknové lasery
Peterka, Pavel
2010 - Czech
Vláknové lasery patří mezi nejpůsobivější úspěchy fotoniky posledních let. Poskytují hrubou sílu využitelnou pro řezání a sváření v průmyslu, ale lze je nalézt i v delikátních zařízeních vyvíjených pro dosud nejpřesnější měření frekvence a času. V příspěvku jsou uvedeny základní principy činnosti vláknových zesilovačů a laserů, některé jejich aplikace a vybrané výsledky výzkumu v tomto oboru v Ústavu fotoniky a elektroniky AV ČR, v.v.i. Fiber lasers are one of the most spectacular achievements of contemporary optoelectronics and photonics. Variety of fiber lasers were demonstrated ranging from mighty continuous-wave systems with multi-kilowatt output powers to elegant femtosecond-pulse sources for precise frequency and time measurements. In the contribution, we present basic principles and applications of these new sources of laser radiation and we present selected research results in this field in the Institute of Photonics and Electronics. Keywords: fiber laser; fiber amplifiers; optical fibers; lasery; měření frekvence Available at various institutes of the ASCR
Vláknové lasery

Vláknové lasery patří mezi nejpůsobivější úspěchy fotoniky posledních let. Poskytují hrubou sílu využitelnou pro řezání a sváření v průmyslu, ale lze je nalézt i v delikátních zařízeních vyvíjených ...

Peterka, Pavel
Ústav fotoniky a elektroniky, 2010

About project

NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web

Send your suggestions and comments to nusl@techlib.cz

Provider

http://www.techlib.cz

Facebook

Other bases