Search results

1

Spatially resolved measurement of hydroxyl (OH) radical concentration in a microwave plasma jet by planar laser-induced fluorescence

100%

Voráč J., Hnilica J., Kudrle V., Dvořák P.

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issue 1

EN

The spatially resolved concentration of OH radicals in the effluent of a microwave (MW) surfatron plasma jet was measured by planar laser-induced fluorescence. Two cases were compared – constant MW power and MW power modulated by 80 Hz. In both cases the maximal concentration was at the tip of the visible discharge, but for constant MW power the OH was spread over a larger volume. The maximum concentration in both cases was on the order of 1022 m-3.

2

Stability of colloidal systems - a review of the stability measurements methods

100%

Matusiak J., Grządka E.

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

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2017

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vol. 72

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issue 1

EN

The stability of colloidal systems is very important in numerous already existing and new formulations. In most cases if such systems are not characterized by an appropriate stability they can not find any useful applications. The opposite process to the stabilization is the flocculation. Generally, it is undesirable. However, in a few cases the flocculation is very useful, for example in the wastewater treatment. That is why the methods used to determine stabilizing-flocculating properties of the colloidal systems are of significant importance.The paper describes types of stability and flocculation as well as the factors influencing those processes, e.g. the addition of polymers or surfactants. The methods presented in this paper are UV-VIS spectrophotometry, turbidimetry, zeta potential and density measurements.

3

Synthesis and Characterization of a Novel Aminoketooxime Ligand and Enzymatic Efficiencies of Its Metal Complexes

100%

Gorgulu G., Cicek M., Dede B.

Acta Physica Polonica A

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2018

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vol. 133

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issue 2

244-249

EN

A novel aminoketooxime ligand and its mononuclear Cu(II) and Mn(II) complexes were synthesized. The structures of the synthesized compounds were illuminated by elemental analysis, inductively coupled plasma optical emission spectrometry, the Fourier transform infrared, ¹H- and ¹³C-NMR, UV-Vis, magnetic susceptibility and conductivity measurements. According to the characterization studies ligand to metal ratio was found to be 2:1 with strong binding affinity of the ligand to the metal ions. In addition, complexes have been tested for their catecholase and phenoxazinone synthase-like activities. Kinetic studies were also carried out yielding V_{max}, k_{cat} and K_{M} values of both complexes for catecholase and phenoxazinone synthase-like activities. Both complexes efficiently catalyzed the reactions of the enzymes they mimicked.

4

Spectroscopic Properties and Quantum Chemical Calculations of Novel Diimine Molecules and their Mononuclear Cu(II) Complexes

86%

Dede B., Gorgulu G.

Acta Physica Polonica A

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2018

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vol. 133

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issue 2

256-262

EN

Two novel Schiff base ligands, 2,2'-((pentane-2,4-diylidene)bis(azanylylidene))bis(4-chlorophenol) and 2,2'-((pentane-2,4-diylidene)bis(azanylylidene))bis(4-methylphenol) were prepared by condensation reaction of acetylacetone with 2-amino-4-chlorophenol and 2-amino-4-methylphenol, respectively. Mononuclear Cu(II) complex of each ligand was also synthesized. These compounds were characterized by elemental analyses, inductively coupled plasma optical emission spectrometry, the Fourier transform infrared spectra, UV-Vis, molar conductivity, and magnetic susceptibility measurements. The ligands have been further characterized by ¹H- and ¹³C-NMR. The results suggest that the metal complexes of the ligands have a metal:ligand ratio of 1:1 and the Cu(II) ions are coordinated by the phenolic oxygen atoms and imine nitrogen atoms of the ligands. Moreover, the quantum chemical calculations of the compounds have been performed using the density functional theory. It has been found that the calculated spectroscopic values are in a good agreement with experimental data.

5

Zagadkowe znalezisko z elipsy spadku meteorytu Łowicz

86%

Kozłowski S.

Acta Societatis Metheoriticae Polonorum

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2023

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vol. 14

93-99

EN

The paper presents the circumstances of finding and analyses of an unusual 35 g piece of iron-like meteor-wrong collected in the strewnfield of the Łowicz meteorite (mesosiderite). While both the outer appearance of the specimen and its internal etched section closely resemble that of meteorites, as it includes pseudo-figures and pseudo-Neumann lines, the X-ray fluorescence (XRF) and scanning electron microscope (SEM) spectroscopy shows no signs of the nickel content in the iron-dominated alloy. This rules out the possibility of this specimen having outer space origin.

6

A study of background emissions enhancements in nitrogen afterglows, due to addition of discharged O2, in connection with the reactions {N2 (A3Σu+, υ) + O(3P)}, {O2 (a1Δg) + N(4S)} and {O2 (a1Δg) + N2 (A3Σu+)}

86%

Kamaratos E.

Open Chemistry

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2005

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vol. 3

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issue 3

387-403

EN

Intensity enhancement due to the addition of discharged O2 is examined for background N2 (B Πg → A3Σu+) emissions in various flowing nitrogen afterglows. Possible implications are reported for the experimentally determined rate constants for the reactions {N2 (A3Σu+, υ) + O(3P)}, and {O2 (a1Δg) + N(4S)}, as a result of the present study. The present, as well as previously reported, N2 (B Πg → A3Σu+) emissions intensity enhancements suggest complementary conclusions. Previous differences in experimental results reported for the {O2 (a1Δg) + N(4S)} reaction [based on studies observing the decay of either O2 (a1Δg) molecules or N(4S) atoms alone] are reconciled by a unifying additional interpretation. This interpretation leads to a rate constant estimate for the energy transfer reaction, {O2 (a1Δg) + N(2(A3Σu+)}, deduced to account for the above N2 (B3Πg → A3Σu+) emissions intensity enhancements.

7

Cavitation erosion of electrostatic spray polyester coatings with different surface finish

86%

Szala M., Świetlicki A., Sofińska-Chmiel W., Szala M., Świetlicki A., Sofińska-Chmiel W.

Bulletin of the Polish Academy of Sciences: Technical Sciences

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2021

8

Synthesis, Characterization and DFT Calculations of 4-((2-Hydroxyethyl)imino)naphthalen-1(4H)-One and its Cu(II) Complex

86%

Gorgulu G., Dede B.

Acta Physica Polonica A

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2018

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vol. 133

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issue 2

239-243

EN

We have reported herein the synthesis of a novel quinone derivative ligand containing the Schiff base and its Cu(II) complex starting from 1,4-naphthoquinone. Synthesized compounds were characterized using the Fourier transform infrared, UV-Vis, elemental analysis, inductively coupled plasma optical emission spectrometry, molar conductivity, and magnetic susceptibility measurements. The free ligand was also characterized by ¹H- and ¹³C-NMR spectra. Elemental analyses, stoichiometric and spectroscopic data indicated that the metal:ligand ratio is 1:2 and octahedral structure is proposed for the metal complex of the Schiff base ligand. Computational quantum calculations were also performed using DFT/B3LYP level of theory with 6-311++G(d,p) basis set for the synthesized ligand. It was found that the experimental and theoretical spectroscopic data were consistent.

9

Investigation and modelling of rare-earth activated waveguide structures

86%

Woliński W., Malinowski M., Mossakowska-Wyszyńska A., Piramidowicz R., Szczepański P.

Bulletin of the Polish Academy of Sciences: Technical Sciences

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2005

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vol. 53

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issue 2

10

Measurements of Spectral Spatial Distribution of Scattering Materials for Rear Projection Screens used in Virtual Reality Systems

86%

Mazikowski A., Trojanowski M.

Metrology and Measurement Systems

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2013

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issue 3

11

A time-domain pulse amplitude and width discrimination method for photon counting

72%

del Mar Correa Maryam, Pérez F. R.

Metrology and Measurement Systems

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2018

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vol. 25

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issue 2

Refine search results

Spatially resolved measurement of hydroxyl (OH) radical concentration in a microwave plasma jet by planar laser-induced fluorescence

Stability of colloidal systems - a review of the stability measurements methods

Synthesis and Characterization of a Novel Aminoketooxime Ligand and Enzymatic Efficiencies of Its Metal Complexes

Spectroscopic Properties and Quantum Chemical Calculations of Novel Diimine Molecules and their Mononuclear Cu(II) Complexes

Zagadkowe znalezisko z elipsy spadku meteorytu Łowicz

A study of background emissions enhancements in nitrogen afterglows, due to addition of discharged O2, in connection with the reactions {N2 (A3Σu+, υ) + O(3P)}, {O2 (a1Δg) + N(4S)} and {O2 (a1Δg) + N2 (A3Σu+)}

Cavitation erosion of electrostatic spray polyester coatings with different surface finish

Synthesis, Characterization and DFT Calculations of 4-((2-Hydroxyethyl)imino)naphthalen-1(4H)-One and its Cu(II) Complex

Investigation and modelling of rare-earth activated waveguide structures

Measurements of Spectral Spatial Distribution of Scattering Materials for Rear Projection Screens used in Virtual Reality Systems

A time-domain pulse amplitude and width discrimination method for photon counting