No (339)
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Calculation of the Electromagnetic Field Around Microtubule
Havelka, D.; Cifra, Michal
2009 - English
Microtubules are important structures in cytoskeleton which organizes the cell. Single microtubule is composed of electrically polar structures, tubulin heterodimers, which have strong electric dipole moment. Vibrations are expected to be generated in microtubules, thus tubulin heterodimers as electric dipoles are oscillating. This gives rise to electromagnetic field, which is detected around the cells. We calculate here the electromagnetic field of microtubules if they are excited at 1 GHz. This paper includes the work done in bachelor thesis of the first author.
Keywords:
bioelectric phenomena; microtubules; bioelectromagnetism
Available at various institutes of the ASCR
Calculation of the Electromagnetic Field Around Microtubule
Microtubules are important structures in cytoskeleton which organizes the cell. Single microtubule is composed of electrically polar structures, tubulin heterodimers, which have strong electric dipole ...
Respiratory and cardiovascular health effects of nanoparticles
Nohavica, Dušan
2009 - English
Numerous combustion related and natural sources generate airborne ultra fine particulate matter (<100 nm). Several epidemiological studies have found adverse respiratory and cardiovascular health effects in susceptible parts of the population to be associated with these particles. Published clinical studies with 10-50 μg/m3 ultra fine elemental carbon particles as surrogates for ambient particles did induce cardiovascular effects in healthy adults.
Keywords:
Nanotechnology; toxicity
Available at various institutes of the ASCR
Respiratory and cardiovascular health effects of nanoparticles
Numerous combustion related and natural sources generate airborne ultra fine particulate matter (...
Wide view of broadband in the CR
Kuchar, Anton
2009 - English
Situation in construction and operation of broadband acces networks in the Czech Republic is described from a broader perspective.
Keywords:
optical communication; Wireless communication; Cable television
Available at various institutes of the ASCR
Wide view of broadband in the CR
Situation in construction and operation of broadband acces networks in the Czech Republic is described from a broader perspective.
The role of small and medium CATV operators in providing e-services in the Czech Republic
Kuchar, Anton
2009 - English
As the demand for broadband e-services is increasing, there is a good chance for the cable TV operators to successfully compete with the traditional telecommunication operators in providing the services taking advantage of their broadband infrastructure. The paper reviews the Czech telecommunications arena focusing on the role of CATV operators and service providers in general and of the small and medium ones in particular.
Keywords:
Telecommunication networks; Optical communication; Cable television
Available at various institutes of the ASCR
The role of small and medium CATV operators in providing e-services in the Czech Republic
As the demand for broadband e-services is increasing, there is a good chance for the cable TV operators to successfully compete with the traditional telecommunication operators in providing the ...
The role of small and medium CATV operators in providing e-services in the Czech Republic
Kuchar, Anton; Klíma, P.
2009 - English
As the demand for broadband e-services is increasing, there is a good chance for the cable TV operators to successfully compete with the traditional telecommunication operators in providing the services taking advantage of their broadband infrastructure. The paper reviews the Czech telecommunications arena focusing on the role of CATV operators and service providers in general and of the small and medium ones in particular.
Keywords:
Telecommunication networks; Optical communication; Cable television
Available at various institutes of the ASCR
The role of small and medium CATV operators in providing e-services in the Czech Republic
As the demand for broadband e-services is increasing, there is a good chance for the cable TV operators to successfully compete with the traditional telecommunication operators in providing the ...
COMPARISON OF SPEECH VOCODERS BASED ON REAL AND COMPLEX CEPSTRAL COEFFICIENTS
Staněk, Jan; Vondra, Martin
2009 - English
New approach to speech analysis and synthesis using the complex cepstral coefficients was implemented in a form of a vocoder based on complex cepstral coefficients. To test the results of this new vocoder a comparison with results of an existing vocoder based on real cepstral coefficients were done. This paper describes the structure of both vocoders and the results of performed tests.
Keywords:
speech synthesis
Available at various institutes of the ASCR
COMPARISON OF SPEECH VOCODERS BASED ON REAL AND COMPLEX CEPSTRAL COEFFICIENTS
New approach to speech analysis and synthesis using the complex cepstral coefficients was implemented in a form of a vocoder based on complex cepstral coefficients. To test the results of this new ...
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 ...
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 ...
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 ...
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