Search results for: J. Winiarski

Items from 1 to 20 out of 75 results

article

Evolution of Physical Properties of RE₃Ni₅Al₁₉ Family (RE = Y, Nd, Sm, Gd, Tb, Dy, Ho, and Er)

Zuzanna Ryżyńska, Madalynn Marshall, Weiwei Xie, Tomasz Klimczuk, more

Crystal Research and Technology > 58 > 2 > n/a - n/a

Single crystals of RE₃Ni₅Al₁₉ series (RE = Y, Nd, Sm, Gd, Tb, Dy, Ho, and Er) are grown using the Al self‐flux method. The crystal structure is examined by both single crystal and powder X‐ray diffraction. Physical properties are studied for the first time for RE₃Ni₅Al₁₉ (RE = Y, Nd, Gd, Tb, Dy, Ho, and Er) by means of magnetic susceptibility, electrical resistivity, and heat capacity measurements...

article

Ln₂(SeO₃)₂(SO₄)(H₂O)₂ (Ln=Sm, Dy, Yb): A Mixed‐Ligand Pathway to New Lanthanide(III) Multifunctional Materials Featuring Nonlinear Optical and Magnetic Anisotropy Properties

Ebube E. Oyeka, Michał J. Winiarski, Hanna Świątek, Wyatt Balliew, more

Angewandte Chemie International Edition > 61 > 48 > n/a - n/a

Bottom‐up assembly of optically nonlinear and magnetically anisotropic lanthanide materials involving precisely placed spin carriers and optimized metal‐ligand coordination offers a potential route to developing electronic architectures for coherent radiation generation and spin‐based technologies, but the chemical design historically has been extremely hard to achieve. To address this, we developed...

article

Ln₂(SeO₃)₂(SO₄)(H₂O)₂ (Ln=Sm, Dy, Yb): A Mixed‐Ligand Pathway to New Lanthanide(III) Multifunctional Materials Featuring Nonlinear Optical and Magnetic Anisotropy Properties

Ebube E. Oyeka, Michał J. Winiarski, Hanna Świątek, Wyatt Balliew, more

Angewandte Chemie > 134 > 48 > n/a - n/a

article

Multiscale resistant kernel surfaces derived from inferred gene flow: An application with vernal pool breeding salamanders

Kristopher J. Winiarski, William E. Peterman, Andrew R. Whiteley, Kevin McGarigal

Molecular Ecology Resources > 20 > 1 > 97 - 113

The importance of assessing spatial data at multiple scales when modelling species–environment relationships has been highlighted by several empirical studies. However, no landscape genetics studies have optimized landscape resistance surfaces by evaluating relevant spatial predictors at multiple spatial scales. Here, we model multiscale/layer landscape resistance surfaces to estimate resistance to...

article

A comparison of popular approaches to optimize landscape resistance surfaces

William E. Peterman, Kristopher J. Winiarski, Chloe E. Moore, Carolina da Silva Carvalho, more

Landscape Ecology > 2019 > 34 > 9 > 2197-2208

Context Landscape resistance surfaces are often used to address questions related to movement, dispersal, or population connectivity. However, modeling landscape resistance is complicated by the selection of the most appropriate analytical approach and the assignment of resistance values to landscape features. Objectives We compare three common approaches used in landscape genetics to assign resistance...

article

Effect of Silver Addition to LaFeO₃ Perovskite on the Activity of Monolithic La_1−xAg_xFeO₃ Perovskite Catalysts in Methane Hexane Oxidation

B. Kucharczyk, K. Adamska, W. Tylus, W. Miśta, more

Catalysis Letters > 2019 > 149 > 7 > 1919-1933

La_1−xAg_xFeO₃ (x = 0.05–0.25) perovskites deposited on a honeycomb-shaped monolithic metallic support were used as catalysts for the total oxidation of hydrocarbons. Monolithic catalysts were prepared by washcoating honeycomb substrates with lanthanum-stabilized γ-Al₂O₃, on which La_1−xAg_xFeO₃ was deposited. Catalysts with La_1−xAg_xFeO₃ perovskites show higher activity for methane oxidation at x ≥ 0...

article

Wpływ dodatku palladu do perowskitu LaFeO3 na aktywność katalityczną w utlenianiu węglowodorów

B. Kucharczyk, B. Szczygieł, J. Winiarski, P. Kokot vel Kokocińska

Przemysł Chemiczny > 2018 > T. 97, nr 10 > 1684--1688

Perowskity La1-xPdxFeO3 (x = 0-0,25) wytworzono przez wysokotemperaturową kalcynację (750°C) mieszaniny azotanów lantanu, żelaza i palladu. Przedstawiono charakterystykę katalizatorów zawierających różne ilości Pd (powierzchnia właściwa BET, XRD, SEM). Otrzymane perowskity zastosowano jako warstwę aktywną katalizatorów monolitycznych do utleniania metanu i n-heksanu. Częściowe zastąpienie La w perowskicie...

article

Elektroosadzanie powłok chromowych z przyjaznych środowisku rozpuszczalników eutektycznych na bazie Cr(III) jako alternatywa dla klasycznego chromowania Cr(VI)

J. Winiarski, A. Kozak, B. Szczygieł

Przemysł Chemiczny > 2018 > T. 97, nr 8 > 1340--1343

Przedstawiono wyniki badań wstępnych procesu elektrochemicznego wydzielania powłok chromowych w rozpuszczalniku eutektycznym utworzonym z chlorku choliny i chlorku chromu( III) z dodatkiem 5-20% mas. wody. Wykazano, że powłoki chromowe można otrzymać w zakresie temp. 25-65°C dopiero wówczas, gdy zawartość dodatkowo wprowadzonej do kąpieli wody wynosi 20% mas. Poniżej tego stężenia szybkość chromowania...

article

Electrodeposition of nickel coatings in choline chloride: ethylene glycol deep eutectic solvent

J. Winiarski, B. Cieślikowska, B. Szczygieł

Ochrona przed Korozją > 2018 > nr 4 > 93--95

The electrodeposition and morphology of nickel coatings deposited potentiostatically in (2-hydroxyethyl)trimethylammonium chloride : ethylene glycol (1:2 molar ratio) eutectic solvent on copper substrate were investigated. In the presence of 1 mol dm⁻³NiCl2·6H2O the reduction of nickel at 25 °C takes place at potentials more negative than −0.4 V vs. Ag quasi-reference electrode. It was found that...

article

The properties of zinc coatings electrodeposited on S235JR steel in choline chloride / urea deep eutectic solvent containing ZnCl2

J. Winiarski, P. Brożyńska

Ochrona przed Korozją > 2018 > nr 4 > 83--85

The morphology, topography and corrosion resistance of zinc coatings deposited galvanostatically in choline chloride / urea (1:2 molar ratio) eutectic mixture were investigated. It was discovered that in this solvent containing 0.3 mol dm⁻³ZnCl2, the reduction of zinc starts below −1.1 V vs. Ag wire quasi-reference electrode. The morphology and structure of the deposits are strongly affected by the...

article

Projekty pomocowe jako przejaw działalności projektowej w NATO

J. Winiarski

Nowoczesne Systemy Zarządzania > 2018 > T. 13, nr 1 > 97--108

Celem artykułu jest przedstawienie problematyki związanej ze sposobem realizacji projektów pomocowych w NATO. Specyfika tych projektów wynika z ich wielonarodowego charakteru oraz zorientowania na cele niekomercyjne, służące zapewnieniu bezpieczeństwa i stabilizacji po konflikcie. Dokonano ogólnej charakterystyki działań projektowych podejmowanych przez NATO, zwracając szczególną uwagę na projekty...

article

Rola koopetycji w klastrach logistycznych

J. Winiarski

Gospodarka Materiałowa i Logistyka > 2018 > nr 11 > 564--578, CD

Celem artykułu jest próba identyfikacji występowania koopetycji w klastrach logistycznych, oraz próba ukazania, koopetycji jako jednego z głównych czynników wpływających na wzrost konkurencyjności i osiągnięcie sukcesu przez klastry logistyczne. W artykule przybliżono zagadnienie koopetycji podmiotów gospodarczych oraz dokonano krótkiej prezentacji koncepcji, atrybutów i korzyści klasteringu. Poddano...

article

Synthesis and properties of HoT2Al20 (T = Ti, V, Cr) intermetallic cage compounds

Michał J. Winiarski, Tomasz Klimczuk

Intermetallics > 2017 > 85 > C > 103-109

Polycrystalline samples of HoT₂Al₂₀ (T = Ti, V, Cr) intermetallics were synthesized using a step-wise arc-melting technique. All three compounds adopt the CeCr₂Al₂₀-type crystal structure with Ho atoms positioned inside oversized icosahedral cages formed by Al atoms. The structure of HoV₂Al₂₀ compound is reported. The materials properties were studied by means of electrical resistivity, magnetic susceptibility,...

article

Evolution of corrosion resistance and passive film properties of Ni-Mo alloy coatings during exposure to 0.5M NaCl solution

A. Laszczyńska, W. Tylus, J. Winiarski, I. Szczygieł

Surface and Coatings Technology > 2017 > 317 > C > 26-37

The corrosion properties of Ni-Mo alloy coatings with different molybdenum content (11–32wt%) were investigated in the course of exposure to 0.5M NaCl solution. Polarization resistance and impedance measurements showed that after contact with corrosive media, the formation of passive film on the coating surface, determines the corrosion resistance of Ni-Mo alloys. XPS analysis revealed that, the passive...

article

Effect of irradiation intensity and initial pollutant concentration on gas phase photocatalytic activity of TiO2 nanotube arrays

Paweł Mazierski, Joanna Nadolna, Wojciech Lisowski, Michał J. Winiarski, more

Catalysis Today > 2017 > 284 > C > 19-26

Well-organized TiO₂ nanotube arrays were fabricated via one-step anodization process. The as-prepared TiO₂ nanotubes were characterized by X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS) and scanning electron microscopy (SEM). Photocatalytic activity of obtained photocatalyst was studied in reaction of toluene degradation in the gas...

article

Electrochemical impedance spectroscopy of Ni–Mo alloy coatings in 0.5 M NaCl solution

A. Laszczyńska, J. Winiarski, I. Szczygieł, B. Szczygieł

Ochrona przed Korozją > 2017 > nr 4 > 84--87

The corrosion resistance of Ni–Mo (11÷32 wt% Mo) alloy coatings during 72 h exposure in 0.5 mol·dm−3 solution of NaCl was investigated by means of EIS method. The highest corrosion resistance (charge transfer resistance >12 kΩ·cm²) among all investigated coatings was measured for Ni–Mo coatings with higher molybdenum content (21÷32 wt%). However, after 48-60 h of immersion, visible micro cracks...

article

Crystal structure and low-energy Einstein mode in ErV2Al20 intermetallic cage compound

Michał J. Winiarski, Tomasz Klimczuk

Journal of Solid State Chemistry > 2017 > 245 > C > 10-16

Single crystals of a new ternary aluminide ErV₂Al₂₀ were grown using a self-flux method. The crystal structure was determined by powder X-ray diffraction measurements and Rietveld refinement, and physical properties were studied by means of electrical resistivity, magnetic susceptibility and specific heat measurements. These measurements reveal that ErV₂Al₂₀ is a Curie-Weiss paramagnet down to 1.95K...

article

Polish clusters and European clusters – differences in the mechanisms of their creation and functioning

J. Winiarski

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki > 2017 > Nr 2 > 151--164

As the significance of clusters has been growing, it is important to focus on the issues related to the mechanisms of their creation and functioning. The purpose of the article is to present the specific character of Polish clusters by comparing them with European clusters on the basis of the literature study and the author’s own research.

article

The effect of pH of plating bath on electrodeposition and properties of protective ternary Zn–Fe–Mo alloy coatings

J. Winiarski, A. Leśniewicz, P. Pohl, B. Szczygieł

Surface and Coatings Technology > 2016 > 299 > C > 81-89

Ternary Zn–Fe–Mo alloy coatings electrodeposition in a sulphate bath with tri-sodium citrate in the pH range 4.8–6.0 was studied. The increase of the plating bath pH from 4.8 to 6.0 leads to the iron content increase from 1.5 up to 7.9wt% and it is accompanied by a significant decrease in the current efficiency from 76 to 51%. It was demonstrated that molybdenum co-deposition starts at pH>4.8,...

article

Electrodeposition and characterization of Ni–Mo–ZrO2 composite coatings

A. Laszczyńska, J. Winiarski, B. Szczygieł, I. Szczygieł

Applied Surface Science > 2016 > 369 > C > 224-231

Ni–Mo–ZrO₂ composite coatings were produced by electrodeposition technique from citrate electrolytes containing dispersed ZrO₂ nanopowder. The influence of deposition parameters i.e. concentration of molybdate and ZrO₂ nanoparticles in the electrolyte, bath pH and deposition current density on the composition and surface morphology of the coating has been investigated. The structure, microhardness...

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INFONA - science communication portal

Search results for: J. Winiarski

Evolution of Physical Properties of RE₃Ni₅Al₁₉ Family (RE = Y, Nd, Sm, Gd, Tb, Dy, Ho, and Er)

Ln₂(SeO₃)₂(SO₄)(H₂O)₂ (Ln=Sm, Dy, Yb): A Mixed‐Ligand Pathway to New Lanthanide(III) Multifunctional Materials Featuring Nonlinear Optical and Magnetic Anisotropy Properties

Ln₂(SeO₃)₂(SO₄)(H₂O)₂ (Ln=Sm, Dy, Yb): A Mixed‐Ligand Pathway to New Lanthanide(III) Multifunctional Materials Featuring Nonlinear Optical and Magnetic Anisotropy Properties

Multiscale resistant kernel surfaces derived from inferred gene flow: An application with vernal pool breeding salamanders

A comparison of popular approaches to optimize landscape resistance surfaces

Effect of Silver Addition to LaFeO₃ Perovskite on the Activity of Monolithic La_1−xAg_xFeO₃ Perovskite Catalysts in Methane Hexane Oxidation

Wpływ dodatku palladu do perowskitu LaFeO3 na aktywność katalityczną w utlenianiu węglowodorów

Elektroosadzanie powłok chromowych z przyjaznych środowisku rozpuszczalników eutektycznych na bazie Cr(III) jako alternatywa dla klasycznego chromowania Cr(VI)

Electrodeposition of nickel coatings in choline chloride: ethylene glycol deep eutectic solvent

The properties of zinc coatings electrodeposited on S235JR steel in choline chloride / urea deep eutectic solvent containing ZnCl2

Projekty pomocowe jako przejaw działalności projektowej w NATO

Rola koopetycji w klastrach logistycznych

Synthesis and properties of HoT2Al20 (T = Ti, V, Cr) intermetallic cage compounds

Evolution of corrosion resistance and passive film properties of Ni-Mo alloy coatings during exposure to 0.5M NaCl solution

Effect of irradiation intensity and initial pollutant concentration on gas phase photocatalytic activity of TiO2 nanotube arrays

Electrochemical impedance spectroscopy of Ni–Mo alloy coatings in 0.5 M NaCl solution

Crystal structure and low-energy Einstein mode in ErV2Al20 intermetallic cage compound

Polish clusters and European clusters – differences in the mechanisms of their creation and functioning

The effect of pH of plating bath on electrodeposition and properties of protective ternary Zn–Fe–Mo alloy coatings

Electrodeposition and characterization of Ni–Mo–ZrO2 composite coatings

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