Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds

Karolczyk J., Mozia S., Morawski A. W., Przepiórski J.

Polish Journal of Chemical Technology

2012

Vol. 14, nr 4

95-99

Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO3 or Mg(OH)2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly influenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confirmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confirmed to be an useful method to evaluate concentration of humic acid in water.

The assessment of bell casting producibility based on computer simulation of pouring and solidification

Nadolski M., Zyska A., Konopka Z., Łągiewka M., Karolczyk J.

Archives of Foundry Engineering

2011

Vol. 11, iss. 3 spec.

141--144

The work estimates the possibility of modification of the traditional production method of bell castings taking into account calculations performed by NovaFlow&Solid simulation program. Changes are evaluated with regard to the arrangement of the shrinkage defects in castings, which are of influence on the acoustic and mechanical properties of castings.

Optical calibration of the picosecond time scale and correlated background elimination in fluorescence dynamic measurements by time-correlated photon counting.

Dobek K., Karolczyk J., Komar D., Kubicki J., Szymański M., Wróżowa T.

Optica Applicata

1998

Vol. 28, nr 3

201-207

A simple, feasible and precise method of calibration of the time scale of a TCSPC laser spectrometer is devised, based in the insertion of an optical delay into one of the start/top channels. The delay can vary from a fews ps to about 1 ns depending on the geometry and refractive index of the medium used, and can be determined with an accuracy better than 1%. A procedure is proposed for eliminating the time-correlated background appearing mainly due to Raman scattering and trace impurities in solvents, which is a serious impediment in TCSPC measurements an analysis of excited state decay in the picosecond time scale. The problem of the correlated background elimination is particulary important for sample of the excited state decay time of single picoseconds, which usually show very weak liminescence.