Search results for: J. Piekoszewski

Items from 1 to 20 out of 78 results

article

Diagnozowanie uszkodzeń łożysk tocznych z wykorzystaniem wybranych klasyfikatorów

J. Piekoszewski

Autobusy : technika, eksploatacja, systemy transportowe > 2018 > R. 19, nr 12 > 597--601

Niewielkie uszkodzenie łożysk tocznych może prowadzić do poważnej awarii urządzenia. Zatem, bardzo ważnym jest wykrycie takich defektów na ich początkowym etapie powstawania aby zapobiec dalszym uszkodzeniom. W pracy przedstawiono kilka wybranych teoretycznych narzędzi z obszaru sztucznej inteligencji zastosowanych do rozwiązania problemu diagnozowania uszkodzeń łożysk tocznych. Rozważanymi narzędziami...

article

Analiza porównawcza wybranych klasyfikatorów w diagnozowaniu uszkodzeń przekładni zębatych

J. Piekoszewski

Autobusy : technika, eksploatacja, systemy transportowe > 2017 > R. 18, nr 12 > 1233--1236, CD

Niewielkie uszkodzenie przekładni zębatej może prowadzić do poważnej awarii urządzenia. Zatem, bardzo ważnym jest wykrycie takich defektów na ich początkowym etapie powstawania aby zapobiec dalszym uszkodzeniom. Praca przedstawia kilka wybranych teoretycznych narzędzi z obszaru sztucznej inteligencji zastosowanych do rozwiązania problemu diagnozowania uszkodzeń przekładni zębatych. Rozważanymi narzędziami...

chapter

Ion Implanted Nanolayers in Alloys and Ceramic Coatings for Improved Resistance to High-Temperature Corrosion

Z. Werner, W. Szymczyk, J. Piekoszewski

NATO Science Series II: Mathematics, Physics and Chemistry > Nanostructured Thin Films and Nanodispersion Strengthened Coatings > Film Characterization and Control of Structure and Properties > 193-202

Ion implantation effects on resistance of alloys and ceramic coatings to the high-temperature corrosion have been reviewed. The most significant results on implantation of reactive elements (Y, La, Ce and other rare earth elements) into alloys and aluminum, boron, silicon, tantalum, and titanium into ceramic coatings have been cited. Ion implantation affects not only the oxide growth rate, but also...

chapter

Ion Implanted Nanolayers in Alloys and Ceramic Coatings for Improved Resistance to High-Temperature Corrosion

Z. Werner, W. Szymczyk, J. Piekoszewski

article

Optymalizacja lokalizacji centrów dystrybucyjnych z wykorzystaniem wielokryterialnego algorytmu genetycznego ɛ-NSGA-II

F. Rudziński, A. Głuszek, J. Piekoszewski

Logistyka > 2014 > nr 6 > 9223--9231

Praca przedstawia zastosowanie genetycznego algorytmu optymalizacji wielokryterialnej ɛ-NSGA-II (ang. Epsilon-Dominance Non-Dominated Sorted Genetic Algorithm) do rozwiązywania problemu rozmieszczenia centrów dystrybucyjnych w sieci dystrybucyjnej (logistycznej). Zastosowana technika optymalizacji umożliwia uzyskanie zestawu tzw. rozwiązań Pareto-optymalnych, reprezentujących różny poziom kompromisu...

article

Application of nuclear techniques for characterization of materials surfaces : own investigations examples

B. Sartowska, J. Piekoszewski, L. Waliś, W. Starosta, more

Nukleonika > 2012 > Vol. 57, No. 4 > 521-528

Different methods and techniques for material characterization are often used as a standard procedure for the determination of material properties. Nuclear techniques provide new and more detailed information about the investigated materials. The main goal of the carried out experiments was to improve surface properties including wear, corrosion and high temperature oxidation resistance. Modification...

article

High - temperature oxidation resistance in yttrium implanted stainless steel

M. Barlak, J. Piekoszewski, Z. Werner, B. Sartowska, more

Nukleonika > 2012 > Vol. 57, No. 4 > 473-476

Austenitic AISI 304, 316L and ferritic 430 stainless steels were implanted with yttrium to fluences ranging between 1 x 1015 and 5 x 1017 ions/cm2. The samples were subjected to oxidation in air at a temperature of 1000 centigrade for a period of 100 h and next examined by stereoscopic optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX) and Rutherford...

article

Wettability of carbon and silicon carbide ceramics induced by their surface alloying with Zr and Cu elements using high intensity pulsed plasma beams

M. Barlak, J. Piekoszewski, B. Sartowska, L. Waliś, more

Nukleonika > 2012 > Vol. 57, No. 4 > 477-483

Joining of metals with ceramics is very difficult, because properties of these materials are very different. One of the methods of improving mechanical strength of the obtained joints is the introduction of an additional interlayer to the joining area. This paper presents the Zr and Cu-rich layers in C and SiC substrates obtained using the high intensity pulsed plasma beams method. The results of...

article

Modes of the use of high intensity plasma beams for ceramic surface modification

M. Barlak, J. Piekoszewski, Z. Werner, B. Sartowska, more

Surface & Coatings Technology > 2011 > 206 > 5 > 916-919

Wetting properties of ceramic materials may be enhanced by treating them with high-intensity plasma pulses carrying a substantial fraction of metallic ions. Rod Plasma Injectors (RPI), developed originally for fusion studies, may generate such plasma pulses containing the working gas used for discharge initiation and the metal ions eroded from the discharge electrodes. We examined the plasma pulse...

article

Improvement of high temperature oxidation resistance of AISI 316L stainless steel by incorporation of Ce–La elements using intense pulsed plasma beams

J. Piekoszewski, B. Sartowska, M. Barlak, P. Konarski, more

Surface & Coatings Technology > 2011 > 206 > 5 > 854-858

It is well documented that adding some active elements (such as Y, Ce, La, Er, others) to austenitic stainless steels helps to improve their high temperature oxidation resistance. In the present work we report preliminary results of incorporation of Ce and La into austenitic stainless steel AISI 316L using a new approach based on high intensity pulsed plasma beams. The characteristic feature of this...

article

Structure and Composition of Scales Formed on AISI 316 L Steel Alloyed with Ce/La Using High Intensity Plasma Pulses after Oxidation in 1000°C

B. Sartowska, J. Piekoszewski, L. Waliś, M. Barlak, more

Acta Physica Polonica A > 2011 > 120 > 1 > 83-86

It is well documented that the high oxygen affinity elements such as Y, Ce, La, Er and other rare earth elements added to steel in small amounts can improve their high temperature oxidation resistance. Rare earth elements can be either alloyed during the steel making process or introduced through surface treatment techniques. Improvement of high temperature oxidation resistance of AISI 316 L steel...

article

Implanted manganese redistribution in Si after He+ irradiation and hydrogen pulse plasma treatment

Z. Werner, C. Pochrybniak, M. Barlak, J. Piekoszewski, more

Nukleonika > 2011 > Vol. 56, No. 1 > 5-8

Si-Mn alloy with a Mn content of a few percent is potentially a candidate for room temperature (RT) dilute magnetic semiconductor (DMS). However, the present methods of material manufacture suffer from problems with poor Mn solubility and thermodynamical limitations. We study a non-equilibrium method in which silicon is first implanted with 160 keV manganese ions to a dose of 1 × 1016 ions/cm2 and...

article

Superconductivity of MgB_2 Layers Prepared on Silicon Substrate by Implantation of Magnesium Ions into Boron Substrate

Z. Trybuła, W. Kempiński, Sz. Łoś, K. Kaszyńska, more

Acta Physica Polonica A > 2010 > 118 > 2 > 323-325

The results of investigation of the MgB_2 layers prepared on silicon substrate by implantation of Mg ions into boron substrate are presented. After implantation the annealing processes were carried out at temperatures 673 K, 773 K, and 873 K in a furnace in an atmosphere of flowing Ar-4%H_2 gas mixture. The samples were characterized by: four-probe electric conductivity measurements and magnetically...

article

Surface morphology of unalloyed steels remelted with intense plasma pulses

B. SARTOWSKA, J. PIEKOSZEWSKI, L. WALIŚ, M. BARLAK

Journal of Microscopy > 237 > 3 > 370 - 373

The set of unalloyed steels with various carbon concentrations were irradiated with intense plasma pulses with following process parameters: energy density 5 J cm⁻², pulse duration 2 μs, argon or nitrogen atmosphere. The energy density of each pulse was high enough to melt the surface layer of material. The cooling rate was estimated for 10⁸ K s⁻¹ using the modelling method which takes into account...

article

Superconductivity of Mg–B layers prepared by a multi-energy implantation of boron into magnesium and magnesium into boron bulk substrates followed by the furnace and pulsed plasma annealing

J. Piekoszewski, W. Kempiński, M. Barlak, Z. Werner, more

Surface & Coatings Technology > 2009 > 203 > 17-18 > 2694-2699

B ions into Mg and Mg ions into B substrates were implanted in triple mode, i.e. each sample was sequentially implanted at three different energies starting from the highest one (80–150 keV range) to the lowest one (40–70 keV range). The energies and fluencies in each particular batch were simulated to yield a possibly large region in which the Mg:B ratio corresponds to stoichiometric MgB ₂ ...

article

Stoichiometric MgB2 layers produced by multi-energy implantation of boron into magnesium

Z. Werner, W. Szymczyk, J. Piekoszewski, M.P. Seah, more

Surface & Coatings Technology > 2009 > 203 > 17-18 > 2712-2716

Ion implantation manufacture of superconducting magnesium diboride films of the MgB ₂ stoichiometry (B:Mg=2:1 composition) by boron implantation in Mg wafers requires a precise knowledge of the implantation process properties, in particular of the partial sputtering yields of Mg atoms by B ions. To verify these yields experimentally we deposited thin Mg films on glassy carbon platelets and...

article

Wettability improvement of carbon ceramic materials by mono and multi energy plasma pulses

M. Barlak, J. Piekoszewski, Z. Werner, J. Stanislawski, more

Surface & Coatings Technology > 2009 > 203 > 17-18 > 2536-2540

Joining of carbon type ceramics with other materials presents an important challenge, especially in view of ITER technology. The crucial problem in joining is wettability of such ceramics with copper. In our previous works we succeeded in improving wettability using two-steps procedure, i.e.: pre-treatment of the ceramics surface with Ti ions implantation and/or deposition of metallic Ti using high...

article

Chemical effects in Zr- and Co-implanted sapphire

Z. Werner, M. Pisarek, M. Barlak, R. Ratajczak, more

Vacuum > 2009 > 83 > Supplement 1 > S57-S60

Sapphire samples were implanted with Zr and Co ions to a fluence of 5×10 ¹⁷ ions/cm ² in MEVVA implanter operated at 65kV. XPS and RBS spectra were studied in the course of annealing within the temperature range of 200–1400°C. It is concluded that Zr diffuses to the surface and forms ZrO ₂ precipitates, whereas Co migrates to the bulk and forms CoAl ₂ O ₄ spinel...

article

The Evolution of Superconducting Phase MgB_x

Sz. Łoś, W. Kempiński, L. Piekara-Sady, B. Andrzejewski, more

Acta Physica Polonica A > 2008 > 114 > 1 > 179-184

Thin layers of MgB_x were studied in order to define evolution of superconducting phase after Mg ions implantation into boron substrate. Three fluencies of energies 140, 80, and 40 keV were used to establish proper stoichiometry to synthesize homogeneous MgB_2 film. Additionally, the annealing processes were carried out at temperatures 400, 500, and 600°C in a furnace in an atmosphere of flowing Ar-4%H_2...

article

Magnetically Modulated Microwave Absorption Study of Superconducting MgB₂ Regions

L. Piekara-Sady, W. Jurga, W. Kempiński, Sz. Łoś, more

Applied Magnetic Resonance > 2008 > 34 > 1-2 > 157-162

. Experiments on thin MgB₂ films synthesized by ion implantation followed by hydrogen-plasma pulse treatment or annealing the sample at a given temperature in a furnace were undertaken. Superconducting properties were examined by magnetically modulated microwave absorption (MMMA) measurements. MMMA was measured as a function of temperature and external magnetic field in differently prepared MgB₂ samples...

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INFONA - science communication portal

Search results for: J. Piekoszewski

Diagnozowanie uszkodzeń łożysk tocznych z wykorzystaniem wybranych klasyfikatorów

Analiza porównawcza wybranych klasyfikatorów w diagnozowaniu uszkodzeń przekładni zębatych

Ion Implanted Nanolayers in Alloys and Ceramic Coatings for Improved Resistance to High-Temperature Corrosion

Ion Implanted Nanolayers in Alloys and Ceramic Coatings for Improved Resistance to High-Temperature Corrosion

Optymalizacja lokalizacji centrów dystrybucyjnych z wykorzystaniem wielokryterialnego algorytmu genetycznego ɛ-NSGA-II

Application of nuclear techniques for characterization of materials surfaces : own investigations examples

High - temperature oxidation resistance in yttrium implanted stainless steel

Wettability of carbon and silicon carbide ceramics induced by their surface alloying with Zr and Cu elements using high intensity pulsed plasma beams

Modes of the use of high intensity plasma beams for ceramic surface modification

Improvement of high temperature oxidation resistance of AISI 316L stainless steel by incorporation of Ce–La elements using intense pulsed plasma beams

Structure and Composition of Scales Formed on AISI 316 L Steel Alloyed with Ce/La Using High Intensity Plasma Pulses after Oxidation in 1000°C

Implanted manganese redistribution in Si after He+ irradiation and hydrogen pulse plasma treatment

Superconductivity of MgB_2 Layers Prepared on Silicon Substrate by Implantation of Magnesium Ions into Boron Substrate

Surface morphology of unalloyed steels remelted with intense plasma pulses

Superconductivity of Mg–B layers prepared by a multi-energy implantation of boron into magnesium and magnesium into boron bulk substrates followed by the furnace and pulsed plasma annealing

Stoichiometric MgB2 layers produced by multi-energy implantation of boron into magnesium

Wettability improvement of carbon ceramic materials by mono and multi energy plasma pulses

Chemical effects in Zr- and Co-implanted sapphire

The Evolution of Superconducting Phase MgB_x

Magnetically Modulated Microwave Absorption Study of Superconducting MgB₂ Regions

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