Number of found documents: 379
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Modifikace materiálů pro optiku, elektroniku a spintroniku iontovým svazkem – iontová implantace pomocí urychlovačů nebo laserem indukovaného plazmatu
Macková, Anna
2016 - Czech
Ion beam modification offers a broad field of the creating the new functional materials and nano-structures for optics, electronics, spintronics and other material branches. Using ions produced by ion accelerators or implanters\nmeans the usage of the monoenergetic beams for precise doped layer, nano-particles or cluster creation by varying the ion implantation specie versus matrix combination together with the implantation energy, ion flux etc. Recently\nappears the multienergetic ion implantation which is realized by using of the intense laser shot generating plasma from the specially designed targets, where the ions are accelerated and can be then implanted into the various\nmaterials. This contribution will present an overview and comparison of different ion beam modification techniques, plasma ion implantation will be also mentioned. Keywords: modification; materials; ion implantation Available at various institutes of the ASCR
Modifikace materiálů pro optiku, elektroniku a spintroniku iontovým svazkem – iontová implantace pomocí urychlovačů nebo laserem indukovaného plazmatu

Ion beam modification offers a broad field of the creating the new functional materials and nano-structures for optics, electronics, spintronics and other material branches. Using ions produced by ion ...

Macková, Anna
Ústav jaderné fyziky, 2016

Calibration and Exact Characterization of Aerosol Deposit colected by SDI Impactor
Havránek, Vladimír
2016 - English
Ion beam analytical methods as PIXE (Particle induced X-ray emission), PIGE (Particle induced gamma-ray emission) and RBS (Rutherford backscattering spectrometry) are frequently used for elemental analysis of different types of atmospheric aerosol samples in a form of aerosol deposits on thin plastic filters or foils (Alfassi and Peisach, 1991, Johansson and Campbell, 1988). An ideal sample for analysis is thin homogeneous aerosol deposit with known deposit area. However in practice such samples are rare. They are often thick (more than limit for thin target approximation i.e. larger then few hundred micrograms per square centimetres), of irregular shape and unknown deposit area. In such conditions all obtained elemental mass results should be corrected for apparent deposit thickness, deposit homogeneity and effective deposit area. Keywords: atmospheric aerosols; PIXE; RBS; calibration; elemental concentration Available at various institutes of the ASCR
Calibration and Exact Characterization of Aerosol Deposit colected by SDI Impactor

Ion beam analytical methods as PIXE (Particle induced X-ray emission), PIGE (Particle induced gamma-ray emission) and RBS (Rutherford backscattering spectrometry) are frequently used for elemental ...

Havránek, Vladimír
Ústav jaderné fyziky, 2016

Vliv kryogenního mletí na homogenitu jódu v NIST SRM1548a Typical Diet
Kameník, Jan; Kučera, Jan
2016 - Czech
The reference material NIST SRM 1548a Typical Diet has a certified iodine mass fraction of 0.759±0.103 mg kg-1. The expanded uncertainty is rather large (relative value 13.6 %), thus the material does not provide strict requirements for quality control results. Milling of NIST SRM 1548a at the temperature of liquid nitrogen yielded free-flowing material. Iodine mass fraction in the original and cryo-ground materials was determined by epithermal neutron activation analysis (ENAA) and radiochemical neutron activation analysis (RNAA). The average and standard deviation from both methods was 0.73±0.03 mg kg-1 (20 values). The determined mass fraction was in a close agreement with the certified value of NIST SRM 1548a, thus iodine total content was not influenced by the milling procedure. In comparison to iodine mass fraction determined in the original NIST SRM 1548a 0.72±0.07 mg kg-1 (average ± standard deviation, 14 values), the standard deviation for cryo-ground material was considerably lower. The prepared quality control material sets up more stringent requirements on the validation and quality control procedures of the measurement of iodine mass fraction in such a composite food matrices. We believe that the iodine random inhomogeneity in the original NIST SRM 1548a is due to insufficient mixing of some iodine-rich component in the complex food matrices. Milling at the temperature of liquid nitrogen offers an effective option for production of future reference materials of this kind. Keywords: SRM1548a Typical Diet; epithermal neutron activation analysis; radiochemical neutron activation analysis Available at various institutes of the ASCR
Vliv kryogenního mletí na homogenitu jódu v NIST SRM1548a Typical Diet

The reference material NIST SRM 1548a Typical Diet has a certified iodine mass fraction of 0.759±0.103 mg kg-1. The expanded uncertainty is rather large (relative value 13.6 %), thus the material does ...

Kameník, Jan; Kučera, Jan
Ústav jaderné fyziky, 2016

Study of fully automated analyzing system for the study of low-dose radiation effects on cellular radiobiology
Nagasaki, Y.; Matuo, Y.; Pachnerová Brabcová, Kateřina; Yasuda, N.
2016 - English
Study of fully automated analyzing system for the study of low-dose radiation effects on cellular radiobiology (poster) Keywords: storage facility; dosimetry; irradiation Available at various institutes of the ASCR
Study of fully automated analyzing system for the study of low-dose radiation effects on cellular radiobiology

Study of fully automated analyzing system for the study of low-dose radiation effects on cellular radiobiology (poster)

Nagasaki, Y.; Matuo, Y.; Pachnerová Brabcová, Kateřina; Yasuda, N.
Ústav jaderné fyziky, 2016

IMPEDANCE MEASUREMENT OF GAS SENSORS WITH NICKEL(II)-AND COPPER(II)-OXIDE ACTIVE LAYERS
Horák, Pavel; Khun, J.; Vrňata, M.; Bejšovec, Václav; Lavrentiev, Vasyl; Vacík, Jiří
2015 - English
Thin layers (90 nm) of nickel(II)- and copper(II)- oxide were deposited onto ceramic sensor substrates equipped with interdigital electrodes for signal reading. The deposition was carried out in two or three steps: (i) sputtering by means of Ar ion beam from pure (99.99%) metal targets, (ii) following thermal oxidation (400 degrees C for 5 h) in air, (iii) in some cases - sputtering of Pd catalyst to the surface. Then the impedance response of produced sensors (NiO, NiO+Pd, CuO, CuO+Pd) to 1000 ppm of hydrogen and 1000 ppm of methanol vapor was measured. Impedance measurements were performed in the frequency range from 40 Hz to 100 MHz. The obtained data were depicted in Nyquist representation (i.e. imaginary vs. real part of complex impedance). These diagrams have a character of one complete and one incomplete semicircle, each of them corresponding to a parallel RC-element. It was proved, that both NiO and CuO behave like p-type semiconductors; the sensor impedance increases on exposure to reducing gases. The best sensitivity was achieved on NiO+Pd sensor - during detection of hydrogen (1000 ppm) the real part of complex impedance measured at 40 Hz increased from 120 to 350 Omega. Keywords: gas sensors; impedance measurement; nickel(II) oxide and copper(II) oxide Available at various institutes of the ASCR
IMPEDANCE MEASUREMENT OF GAS SENSORS WITH NICKEL(II)-AND COPPER(II)-OXIDE ACTIVE LAYERS

Thin layers (90 nm) of nickel(II)- and copper(II)- oxide were deposited onto ceramic sensor substrates equipped with interdigital electrodes for signal reading. The deposition was carried out in two ...

Horák, Pavel; Khun, J.; Vrňata, M.; Bejšovec, Václav; Lavrentiev, Vasyl; Vacík, Jiří
Ústav jaderné fyziky, 2015

RESPONSE OF SURFACE MORPHOLOGY IN COBALT-FULLERENE MIXTURE FILMS UPON VARIATION OF THE METAL CONTENT
Lavrentiev, Vasyl; Lavrentieva, Inna; Vacík, Jiří
2015 - English
The morphology and roughness of the films show great change around some critical composition x(c) of the mixture film (x(c) approximate to 3). The films with lower Co content (x < 3) is rather smooth and the roughness is rather low. However, if x >= 3, the roughness of the CoxC60 films dramatically increases and sharp protrusions appear on the surface that reflects an important phase transformation in the film structure. The obtained AFM results define the concentration interval of the Co solubility in solid C-60 (x < 3), which was found to be narrower than that evaluated from spectroscopic experiments (see the text). This interval suggests a formation of the Co1C60 and Co2C60 fullerides in the CoxC60 mixtures where the Co atoms occupy the tetrahedral holes in the fullerene lattice. The dramatic change of the surface morphology at x >= 3 reflects the pronounced Co clustering which likely occurs due to numerical filling the octahedral pores. Formation of the protrusions on the surface of the supersaturated CoxC60 mixture films (x > 3) is a consequence of the compressive stress arising in the film due to the Co clustering. Keywords: Fullerene; Cobalt; mixture; roughness; surface; phase transformation Available at various institutes of the ASCR
RESPONSE OF SURFACE MORPHOLOGY IN COBALT-FULLERENE MIXTURE FILMS UPON VARIATION OF THE METAL CONTENT

The morphology and roughness of the films show great change around some critical composition x(c) of the mixture film (x(c) approximate to 3). The films with lower Co content (x ...

Lavrentiev, Vasyl; Lavrentieva, Inna; Vacík, Jiří
Ústav jaderné fyziky, 2015

Residual Stress Distribution Measurement by Neutron Diffraction of the Single Pass Fillet Steel Welds
Mráz, Ľ.; Karlsson, L.; Vrána, Miroslav; Mikula, Pavol
2014 - English
In this contribution the results of residual strain/stress measurements performed on several single pass fillet steel welds which were carried out at different welding conditions, namely, with different filler materials are presented. Keywords: residual stress; neutron diffraction; steel welds; fonetika; oceli Available at various institutes of the ASCR
Residual Stress Distribution Measurement by Neutron Diffraction of the Single Pass Fillet Steel Welds

In this contribution the results of residual strain/stress measurements performed on several single pass fillet steel welds which were carried out at different welding conditions, namely, with ...

Mráz, Ľ.; Karlsson, L.; Vrána, Miroslav; Mikula, Pavol
Ústav jaderné fyziky, 2014

Determination of reference values of element contents in certified reference material SWCNT-1 by INAA a PGAA
Kučera, Jan; Sturgeon, R. E.; Grinberg, P.; Oflaz, R.; Paul, R. L.; Bennett, J. W.; De Nadai Fernandes, E. A.; Kubešová, Marie; Bacchi, M. A.; Stopic, A. J.
2014 - Czech
Instrumental neutron activation analysis with both relative and k-0 standardization was used in four experienced laboratories to determine element mass fractions in single-wall carbon nanotube certified reference material (CRM) SWCNT-1. Results obtained were evaluated using the NIST “Type B On Bias” approach and yielded consensus values in agreement with NRCC certified values for Fe, Co, Ni and Mo and provided mass fraction values for thirteen additional elements, namely Na, Mg, Al, K, Ca, Ti, V, Cr, Mn, Br, La, W and Au. In addition, prompt gamma neutron activation analysis was employed to determine mass fractions of H, B, Co, Ni, and Mo. Results of this work provide a basis for the establishment of reference values of element mass fractions in CRM SWCNT-1, thus expanding its usability for more accurate characterization and benchmarking of similar nanotechnology materials. Keywords: carbon nanotubes; neutron activation analysis Available at various institutes of the ASCR
Determination of reference values of element contents in certified reference material SWCNT-1 by INAA a PGAA

Instrumental neutron activation analysis with both relative and k-0 standardization was used in four experienced laboratories to determine element mass fractions in single-wall carbon nanotube ...

Kučera, Jan; Sturgeon, R. E.; Grinberg, P.; Oflaz, R.; Paul, R. L.; Bennett, J. W.; De Nadai Fernandes, E. A.; Kubešová, Marie; Bacchi, M. A.; Stopic, A. J.
Ústav jaderné fyziky, 2014

A comparative study of the total mercury determination in highly contaminated soils by AAS and RNAA methods
Sysalová, J.; Kučera, Jan; Zvěřina, O.
2014 - English
Výsledky srovnávací studie stanovení celkové rtuti ve vysoce kontaminovaných půdách do obsahu 25 mg/kg byly získány dvěma nezávislými metodami: metodou AAS s použitím jednoúčelového spektrometru AMA-254 s přímým dávkováním 10-25 mg pevných vzorků a metodou neutronové aktivační analýzy s radiochemickou separací (RNAA) s navážkami 150 mg vzorků. Vzorky půd byly upravovány sítováním a kryogenním mletím. Kontrola kvality výsledků byla provedena analýzami certifikovaných referenčních materiálů NIST SRM 2711 Montana Soil a NIST SRM 2711a Montana Soil II. Pro vyšší obsahy rtuti nad 25 mg/kg, byly vzorky ředěny mořským pískem v poměru 1:10 a homogenizovány před dávkováním do AMA-254. Proces ředění vzorků v pevném stavu byl ověřen analýzou říčního sedimentu ERM-CC580. Výsledky analýz celkových obsahů rtuti v kontaminovaných půdách získané nezávislými metodami AAS a RNAA vykazují velmi dobrou shodu pro oba uvedené postupy. Keywords: mercury; RNAA; Advanced Mercury Analyser Available at various institutes of the ASCR
A comparative study of the total mercury determination in highly contaminated soils by AAS and RNAA methods

Výsledky srovnávací studie stanovení celkové rtuti ve vysoce kontaminovaných půdách do obsahu 25 mg/kg byly získány dvěma nezávislými metodami: metodou AAS s použitím jednoúčelového spektrometru ...

Sysalová, J.; Kučera, Jan; Zvěřina, O.
Ústav jaderné fyziky, 2014

Zpráva o kalibraci přístroje TriCarb 3180 pro měření karbonátových forem 14C v exponovaných roztocích sorbentu
Světlík, Ivo; Tomášková, Lenka; Megisová, Natália; Wágnerová, Markéta; Ryska, František
2013 - Czech
Keywords: LSC; radiocarbon; releases from nuclear power plants; stack air Available at various institutes of the ASCR
Zpráva o kalibraci přístroje TriCarb 3180 pro měření karbonátových forem 14C v exponovaných roztocích sorbentu

Světlík, Ivo; Tomášková, Lenka; Megisová, Natália; Wágnerová, Markéta; Ryska, František
Ústav jaderné fyziky, 2013

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