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    Wyświetlanie 1-7 z 7
    Tytuł:
    SEM and EDS studies of porous coatings enriched in calcium and zinc obtained by PEO with ramp voltage
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Powiązania:
    https://bibliotekanauki.pl/articles/1178366.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CP Titanium Grade 2
    Micro Arc Oxidation (MAO)
    Plasma Electrolytic Oxidation (PEO)
    calcium nitrate Ca(NO3)2∙4H2O
    linear polarization
    ramp voltage
    zinc nitrate Zn(NO3)2∙6H2O
    Opis:
    In this work, the SEM and EDS results of porous and enriched in calcium or zinc coatings, which were obtained during 3-minute treatments using Plasma Electrolytic Oxidation (Micro Arc Oxidation) processes on CP Titanium Grade 2 at ramp potentials (linear polarization) from 0 up to 650 VDC in electrolytes containing 500 g Ca(NO3)2∙4H2O and/or 500 g Zn(NO3)2∙6H2O in 1 L H3PO4, are presented. It was found that obtained coatings have pores with different shapes and diameters. The Ca/P and Zn/P ratios by atomic concentration are the same and equal to 0.2, what may suggest hydroxyapatite-like structure (M,Ti)x(PO4)y, where M = {Ca, Zn}.
    Źródło:
    World Scientific News; 2017, 77, 2; 242-255
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterisation of porous, calcium enriched coatings formed on Titanium via Plasma Electrolytic Oxidation
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Powiązania:
    https://bibliotekanauki.pl/articles/1179160.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    85% orthophosphoric acid H3PO4
    CP Titanium Grade 2
    Micro Arc Oxidation (MAO)
    Plasma Electrolytic Oxidation (PEO)
    calcium nitrate tetrahydrate Ca(NO3)2∙4H2O
    Opis:
    The SEM and EDS study results of porous and calcium enriched coatings obtained via Plasma Electrolytic Oxidation (Micro Arc Oxidation) on the Commercial Purity Titanium Grade 2 samples, at three potentials 450 VDC, 550 VDC, 650 VDC in electrolytes containing 500 g Ca(NO3)2∙4H2O in 1000 mL H3PO4, are presented in the paper. In the same electrolyte three Titanium samples, one after other, were treated, with the PEO processing time equaling 3 minutes after each immersion. Based on SEM and EDS results, it was possible to state that all obtained coatings are porous and their calcium-to-phosphorus (Ca/P) ratio decreases with decreasing PEO voltage. In addition, it was found out that electrolyte aging results in decreasing Ca/P ratio, too.
    Źródło:
    World Scientific News; 2017, 83; 29-44
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porous PEO coatings on titanium, obtained under DC regime, enriched in magnesium, calcium, zinc, and copper
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Dudek, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1156239.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    plasma electrolytic oxidation (peo)
    micro arc oxidation (mao)
    cp titanium grade 2
    calcium nitrate ca(no3)2•4h2o
    magnesium nitrate mg(no3)2∙6h2o
    zinc nitrate zn(no3)2∙6h2o
    copper nitrate cu(no3)2∙3h2o
    Opis:
    In the present paper, the analysis of SEM and EDS results of porous and enriched in calcium, magnesium, zinc, copper and phosphorus coatings, obtained during 3-minute treatments performed by Plasma Electrolytic Oxidation (PEO)/Micro Arc Oxidation (MAO) processes on CP Titanium Grade 2, is presented. The PEO process was carried out at DC potentials of 500 VDC, 575 VDC, and 650 VDC in electrolytes containing 125 g Ca(NO3)2•4H2O, and 125 g Mg(NO3)2∙6H2O, and 125 g Zn(NO3)2∙6H2O, and 125 g Cu(NO3)2∙3H2O in 1 L H3PO4. It was found that obtained coatings have pores with different shapes and diameters and/or size/dimentions. The Ca/P, Mg/P, Zn/P, Cu/P, and M/P ratios (M=Ca+Mg+Zn+Cu) were equal to 0.074, 0.046, 0.056, 0.042, and 0.218, respectively. The highest value of each of these ratios was recorded for 650 VDC. It may be concluded that the obtained PEO coatings structures most likely are similar to hydroxyapatite-like structures, in which the Ca2+ may be replaced with Zn2+, Mg2+, Cu2+.
    Źródło:
    World Scientific News; 2018, 94, 2; 99-114
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SEM and EDS analysis of enriched in phosphorus and copper coatings fabricated by AC-PEO treatment
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Dudek, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1178082.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CP Titanium Grade 2
    Micro Arc Oxidation (MAO)
    Plasma Electrolytic Oxidation (PEO)
    copper nitrate Cu(NO3)2∙3H2O
    Opis:
    In the present paper, SEM and EDS studies of coatings obtained on CP Titanium Grade 2 under sinusoidal alternating voltage (AC) with frequency 50 Hz in Plasma Electrolytic Oxidation (PEO) process at voltages of 200 Vpp, 250 Vpp and 300 Vpp during 3-minute treatments, are displayed. Based on SEM micrographs it may be stated that the porous surfaces, which are needed for biomedical and catalysis application, are obtained only for samples fabricated at 200 Vpp. It was found out that thickest and most morphologically developed surfaces were obtained at 200 Vpp, too. The surfaces obtained at 250 Vpp and 300 Vpp are cracked and had low concentration of copper, i.e. 0.9 at% and 1.1 at%, respectively, while that one obtained at 200 Vpp was porous and had 8.6 at% copper.
    Źródło:
    World Scientific News; 2018, 95; 246-259
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and SEM/EDS characterisation of porous coatings enriched in magnesium and copper obtained on titanium by PEO with ramp voltage
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Dudek, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1179226.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CP Titanium Grade 2
    Micro Arc Oxidation (MAO)
    Plasma Electrolytic Oxidation (PEO)
    calcium nitrate Mg(NO3)2∙6H2O
    linear polarization
    ramp voltage
    zinc nitrate Ca(NO3)2∙3H2O
    Opis:
    In the present paper, the SEM and EDS results of porous and enriched in calcium and/or zinc coatings, which were obtained during 3-minute treatments by Plasma Electrolytic Oxidation/ Micro Arc Oxidation processes on CP Titanium Grade 2 at ramp potentials (liner polarization) from 0 up to 650 VDC in electrolytes containing 500 g Mg(NO3)2∙6H2O and/or 500 g Cu(NO3)2∙3H2O in 1 L H3PO4, are reported. It was found that the obtained coatings, dependent on the PEO process conditions, have pores with different shapes and diameters. The Mg/P and Cu/P ratios by atomic concentration are the same and equal to 0.09±0.01 (by wt %) | 0.11±0.01 (by at%) and/or 0.40±0.08 (by wt %) | 0.19±0.04 (by at%), respectively. That may testify the hydroxyapatite-like structures of Mg-Ti-PO43– and/or Cu-Ti-PO43– have been identified to occur.
    Źródło:
    World Scientific News; 2017, 80; 29-42
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SEM and EDS studies of selected porous coatings obtained on titanium by Plasma Electrolytic Oxidation
    Autorzy:
    Rokosz, Krzysztof
    Hryniewicz, Tadeusz
    Pietrzak, Kornel
    Dudek, Łukasz
    Malorny, Winfried
    Powiązania:
    https://bibliotekanauki.pl/articles/1178480.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CP Titanium Grade 2
    Micro Arc Oxidation (MAO)
    Plasma Electrolytic Oxidation (PEO)
    calcium nitrate Ca(NO3)2∙4H2O
    copper nitrate Cu(NO3)2∙3H2O
    magnesium nitrate Mg(NO3)2∙6H2O
    Opis:
    In present work, SEM and EDS results of porous and enriched in calcium, copper, magnesium and phosphorus coatings, which were obtained during 3-minute treatments of Plasma Electrolytic Oxidation PEO (Micro Arc Oxidation MAO) processes on CP Titanium Grade 2 at two potentials, i.e. 500 VDC and 650 VDC, are presented. It was found that the voltage of that process influences the chemical composition of coatings shapes obtained on titanium in electrolytes containing calcium, copper and magnesium nitrates. The pores shapes of PEO coatings formed on titanium in electrolytes containing calcium, copper and magnesium nitrates are presented, too. In addition, it was also noted that with using of higher voltage (here 650 VDC) of PEO treatments, the higher Ca/P, Cu/P and Mg/P ratios were found than those after treatments at 500 VDC.
    Źródło:
    World Scientific News; 2017, 70, 2; 71-85
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is there a rationale for aggressive breast cancer liver metastases resections in Polish female patients? Analysis of overall survival following hepatic resection at a single centre in Poland
    Autorzy:
    Kobryń, Eliza
    Kobryń, Konrad
    Wróblewski, Tadeusz
    Kobryń, Krzysztof
    Pietrzak, Radosław
    Rykowski, Paweł
    Ziarkiewicz-Wróblewska, Bogna
    Lamparski, Krzysztof
    Zieniewicz, Krzysztof
    Patkowski, Waldemar
    Krawczyk, Marek
    Paluszkiewicz, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/991146.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    liver metastases
    breast cancer
    liver surgery
    Opis:
    Introduction. Breast cancer (BC) makes up nearly 26% of malignant tumours worldwide and is the leading cause of cancerrelated deaths in European women. With approximately 18,000 new cases of BC diagnosed in Polish women annually, breast cancer liver metastasis (BCLM) is respectively an increasing issue. Recent data found in literature indicates improved survival following liver resection with systemic therapy. Objective. The aim of study was to evaluate surgical treatment in patients with isolated BCLM. Materials and method. During 2009–2013, a retrospective study was undertaken and 30 cases analysed. From nearly 2,000 liver resections performed, 11 female patients at the mean age of 59.18 years with BCLM were qualified for surgery. Results. The median time between primary and secondary treatment was 3.5 years (1–7). One patient (9.1%) presented an extrahepatic lesion – bone metastasis. The left lobe, right lobe and both lobes of the liver were affected, respectively, in 3 (27.3%), 4 (36.4%) and 4 (36.4%) patients. 5 patients (45.5%) presented single hepatic lesion, in contrast to the maximum number of lesions which equalled 6 in the right lobe. Average hospitalisation period was 13.27 days and discharge on the 11.3 postoperative day. One-year survival was 72.7% (8 patients); therefore, three-year survival was 36.4% (4 patients). Conclusions. Oncological centres should assess BCLM patients more openly and qualify them for hepatic resection along with adjuvant systemic treatment in order to improve overall survival. This, however, needs to be studied in a multicentre randomized trial.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2016, 23, 4
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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