National Repository of Grey Literature 31 records found  previous11 - 20nextend  jump to record: Search took 0.01 seconds. 
On Usage of Size Segregated Particle Number Concentration to Guess The Origin of PM2.5 at the Rural Background Site Košetice.
Schwarz, Jaroslav ; Cusack, Michael ; Karban, Jindřich ; Chalupníčková, E. ; Havránek, Vladimír ; Smolík, Jiří ; Ždímal, Vladimír
Rural background studies serve mainly to assess the long-range transport influence and long-term trends. However, it is difficult to find a place with no influence of local sources. This is also the case of Košetice observatory having three small settlements within two km from the observatory. Therefore we attempted to analyze if the influence of these or other nearby sources can be seen in our data on PM2.5 chemical composition. Besides other possibilities like specific ratios of various gaseous compounds we concentrated on using size resolved number concentration data because of their dynamics that leads in general into particle growth until they reach accumulation mode. Several similar studies (e.g. Cusack et al. 2013) were performed during recent years.
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Chemical Composition of PM2.5 at Rural Backround Site Košetice
Schwarz, Jaroslav ; Havránek, Vladimír
PM2.5 generally represents fine fraction of atmospheric aerosol. Fine particles may remain in the atmosphere for days or even weeks and therefore they may be transported over long distances. Moreover, they may increase the background levels of atmospheric aerosol mass far from their origin. They have important adverse health effects and in the same time, they influence climate due to their direct and indirect effects on Earth radiative balance. To know the origin of PM2.5 aerosol, its chemical composition can serve as the diary of contacts with aerosol sources and transformations. Therefore it is necessary to study PM2.5 chemical composition if the fine aerosol sources should be revealed. A rural background site study can serve as a basis enabling to determine the real influence of larger sources like cities or an industry.
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Vlastnosti a zdroje předměstského pozaďového atmosférického aerosolu v Praze
Schwarz, Jaroslav ; Havránek, Vladimír ; Maenhaut, W. ; Chi, X. ; Ždímal, Vladimír ; Hovorka, J. ; Smolík, Jiří
A comprehensive aerosol characterization was perfprmed for a 15-month period at Suchdol, a suburb in the NW of Prague. PM, mass concentrations, mass and number size distributions, PM10 chemical composition and the main factors influencing the PM10 concentrations were determined. The regional air pollution during low mixing periods was found to be the most important factor influencing the local levels of air pollution.
Preparation a characterization of the new set of IAEA reference aerosols for the interlaboratory tests comparison by the methods INAA, PIXE and RBS
Kučera, Jan ; Havránek, Vladimír ; Krausová, Ivana
Preparation a characterization of the new set of IAEA reference aerosols for the interlaboratory tests comparison by the methods INAA, PIXE and RBS.
Capabilities of the PIXE, PIGE and RBS techniques in the studies of moldavites
Havránek, Vladimír ; Mizera, Jiří ; Řanda, Zdeněk
Analytical capabilities of the PIXE, PIGE and RBS ion beam analytical techniques run in a simultaneous mode have been studied on several samples of moldavites. Combining the methods allowed determination of more than 20 major and trace elements. Determination of F and Li by PIGE is of a particular importance, as information about their content in moldavites and other tektites is mostly missing.
Number and Mass Size Distribution Measurement Next to Traffic Source (Jizni spojka)
Schwarz, Jaroslav ; Ždímal, Vladimír ; Matějková, Daniela ; Ondráček, Jakub ; Džumbová, Lucie ; Havránek, Vladimír ; Smolík, Jiří ; Bízek, V.
Number and mass size distribution pilot measurement was done next to large traffic source. Chemical analysis of impactor samples was done.
Vlastnosti vrstev na elektroerodovaném povrchu implantátů
Peřina, Vratislav ; Havránek, Vladimír ; Starý, V. ; Bačáková, Lucie ; Zemek, Josef ; Jirka, Ivan ; Jehlička, J. ; Vorlíček, Vladimír ; Fencl, J.
Plasma sprayed and in oil electroeroded implant surfaces were studied by various surface analytical techniques including cell adhesion.
Epitaxial rectrystalization of the Ni/MgO(001)interface
Vacík, Jiří ; Naramoto, H. ; Yamamoto, S. ; Narumi, K. ; Havránek, Vladimír
Process of recrystallization of the epitaxially grown Ni layer deposited on the MgO(001) single crystal is studied. Thin Ni layer prepared by the vapor deposition of Ni on the MgO substrate kept were annealed between 500 and 1000 0C and systematically analyzed by Rutherford backscattering, X-ray diffraction and atomic force microscopy. Dramatic change in evolution of the crystalline quality was observed during the thermal treatment. The strain and defect density gradually decreased and at the temperature 1000 0C the strain-free Ni/MgO(001) interface was obtained.
RT growth of the micrometer-size C60 crystals in the Ni-C60 nano-composite
Vacík, Jiří ; Naramoto, H. ; Yamanoto, S. ; Narumi, K. ; Havránek, Vladimír
Growth of the multiply twinned C60 particles arisen from the Ni+C60 mixture at RT after lengthy time of development is reported. 10-micrometer large C60 particles grow as facetted crystals with polyhedral shapes stacking in complex superstructures. Mechanism of the particle formation is based on structure transformation of the layer highly stressed due to the co-deposition of the immiscible Ni and C60 components.

National Repository of Grey Literature : 31 records found   previous11 - 20nextend  jump to record:
See also: similar author names
1 Havránek, Vojtěch
2 Havránek, Václav
3 Havránek, Vít
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