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Wyszukujesz frazę "sitarek, A." wg kryterium: Wszystkie pola


Wyświetlanie 1-9 z 9
Tytuł:
57Fe Mössbauer study of stilpnomelane and associated chlorite from Polish granite pegmatites
Autorzy:
Malczewski, D.
Popiel, E.
Sitarek, A.
Powiązania:
https://bibliotekanauki.pl/articles/147222.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
stilpnomelane
chlorite
Mössbauer spectroscopy
Opis:
This paper reports the results of 57Fe Mössbauer study of stilpnomelane K0.6Fe6(Si8Al)(O,OH)27 .2H2O from Żółkiewka (Lower Silesia, Poland). Stilpnomelane in paragenesis with chlorite, tourmaline, claevelandite and zeolites has been found in granite pegmatites in quarries at Żółkiewka. The samples of naturally weathered stilpnomelane and chlorite from the same fragment of rock were also studied. The Mössbauer spectrum of an untreated sample could be fitted to two Fe2+ doublets and two Fe3+ doublets. The Fe2+ doublets have similar isomer shifts, but they distinctly differ in values of quadrupole splittings. Ferric iron, octahedrally coordinated occurs in three different environments represented by two doublets. The first of them, assigned to combined M1 + M2 positions and the second one assigned to M3 site with parameters IS = 0.36 mm/s and QS = 2.07 mm/s is visible in the spectra up to 880°C. This doublet is characteristic of stilpnomelane and can be regarded as a "fingerprint" of this mineral. After heating at 200°C, the relative content of Fe2+, ÓFe2+/ÓFe, decreases to 0.22 what means a 50% decrease in comparison to the initial value observed in the untreated sample. At about 1000°C, complete breakdown of the stilpnomelane structure takes place and the Mössbauer spectrum consists of two sextets and two ferric doublets. Abnormally high content of Fe2+ in naturally weathered stilpnomelane (0.70) comparing to the untreated sample of stilpnomelane (0.45) indicates that the sample had to be subjected to hydrothermal processes operating locally. Almost the same contents of divalent iron and hyperfine parameters of Fe2+ and Fe3+ doublets in weathered stilpnomelane and associated chlorite suggest that the process of chlorite transformation into stilpnomelane seems to be very probable.
Źródło:
Nukleonika; 2004, 49,suppl.3; 43-48
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Effective Microorganisms Technology as a lake restoration tool - a case study of Muchawka Reservoir
Autorzy:
Sitarek, M.
Napiórkowska-Krzebietke, A.
Mazur, R.
Czarnecki, B.
Pyka, J. P.
Stawecki, K.
Olech, M.
Sołtysiak, S.
Kapusta, A.
Powiązania:
https://bibliotekanauki.pl/articles/961397.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
This paper presents the effects of an application of Effective Microorganisms (EM) technology in line with the method developed by Sitarek, thus evaluating its effectiveness as a tool in the biological restoration of a water body. In 2012-2013, EM was applied in Muchawka Reservoir situated in the town of Siedlce (eastern Poland). Analyses of water parameters and bottom sediments were carried out in 2011, before the EM technology was implemented and again in 2013-2015 after the EM application was completed. In spring 2011, the average total nitrogen (TN) content at the surface was 3.1 mg dm-3 while the total mineral nitrogen content equalled 0.893 mg dm-3. After the EM application was completed, in the summer of 2013, the TN content was on average 2.5 mg dm-3. The content of nitrates and nitrites in the summer of 2013 reached 1.20 mg dm-3 at the most. Lower levels of such forms of nitrogen were observed in 2013 and also in subsequent years at the bathing beach (site 1) and the hostel (site 3) than at the inflow (site 4). Likewise, the highest content of phosphates was recorded at the inflow site (4), being four -fold lower at the other sites (1, 3). The average content of TP before the EM technology was applied was 0.205 mg dm-3, whereas after the application of effective microorganisms it fell down to 0.189 mg dm-3 (2013-2015). Only slight changes of TSITP indicated that waters in Muchawka Reservoir were eutrophic. After EM was applied twice, no streaks, cyanobacterial scums or pollution at the bathing sites were visible. The bacteriological evaluation of the water samples was carried out by the County Branch of the State Sanitary Inspectorate in Siedlce. The bacteriological water quality was described as “excellent”. These findings suggest that the method developed by Sitarek, combined with probiotic preparations, could be a useful tool in the restoration of water bodies, but the conclusion requires further detailed verification.
Źródło:
Journal of Elementology; 2017, 22, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Effective Microorganisms Technology as a lake restoration tool - a case study of Muchawka Reservoir
Autorzy:
Sitarek, M.
Napiórkowska-Krzebietke, A.
Mazur, R.
Czarnecki, B.
Pyka, J.P.
Stawecki, K.
Olech, M.
Sołtysiak, S.
Kapusta, A.
Powiązania:
https://bibliotekanauki.pl/articles/1190178.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
restoration
eutrophication
remediation
EM
nutrients
Opis:
This paper presents the effects of an application of Effective Microorganisms (EM) technology in line with the method developed by Sitarek, thus evaluating its effectiveness as a tool in the biological restoration of a water body. In 2012-2013, EM was applied in Muchawka Reservoir situated in the town of Siedlce (eastern Poland). Analyses of water parameters and bottom sediments were carried out in 2011, before the EM technology was implemented and again in 2013-2015 after the EM application was completed. In spring 2011, the average total nitrogen (TN) content at the surface was 3.1 mg dm-3 while the total mineral nitrogen content equalled 0.893 mg dm-3. After the EM application was completed, in the summer of 2013, the TN content was on average 2.5 mg dm-3. The content of nitrates and nitrites in the summer of 2013 reached 1.20 mg dm-3 at the most. Lower levels of such forms of nitrogen were observed in 2013 and also in subsequent years at the bathing beach (site 1) and the hostel (site 3) than at the inflow (site 4). Likewise, the highest content of phosphates was recorded at the inflow site (4), being four -fold lower at the other sites (1, 3). The average content of TP before the EM technology was applied was 0.205 mg dm-3, whereas after the application of effective microorganisms it fell down to 0.189 mg dm-3 (2013-2015). Only slight changes of TSITP indicated that waters in Muchawka Reservoir were eutrophic. After EM was applied twice, no streaks, cyanobacterial scums or pollution at the bathing sites were visible. The bacteriological evaluation of the water samples was carried out by the County Branch of the State Sanitary Inspectorate in Siedlce. The bacteriological water quality was described as “excellent”. These findings suggest that the method developed by Sitarek, combined with probiotic preparations, could be a useful tool in the restoration of water bodies, but the conclusion requires further detailed verification.
Źródło:
Journal of Elementology; 2017, 22, 2; 529-543
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interface and Surface Subsignals in Photoreflectance Spectra for GaAs/SI-GaAs Structures
Autorzy:
Jezierski, K.
Sitarek, P.
Misiewicz, J.
Panek, M.
Ściana, B.
Korbutowicz, R.
Tłaczała, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933782.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
71.35.+z
Opis:
Photoreflectance spectra were measured at room temperature for energies in the vicinity of the E$\text{}_{0}$ critical point for p-type as well as n-type doped GaAs/SI-GaAs structures. Depending on the doping concentration the existence of two photoreflectance subsignals was observed; the first one arises from the surface space charge region while the second one from the interface region. The decomposition of photoreflectance spectrum into surface and interface subsignals was based on the photoreflectance measurements carried out for different wavelengths of the laser pump beam.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 751-754
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light-Induced Modification of 3D Photonic Band Structure Detected by Means of PhotoreflectionD
Autorzy:
Kapitonov, A. M.
Kachan, S. M.
Ponyavina, A. N.
Gaponenko, S. V.
Bogomolov, V. N.
Prokofiev, A. V.
Sitarek, P.
Misiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1995551.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
42.70.Gi
Opis:
Porous synthetic opal possessing a three-dimensional photonic band structure of semimetallic type was impregnated with polycrystalline CdS. The photonic stop band in (111) direction was examined by means of photoreflection technique. Under cw laser excitation of semiconductor inclusions the reflectance of the system changes indicating a modification of photonic band structure. A possible mechanism is discussed. Numerical simulations within the framework of quasicrystalline approximation are given.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 335-342
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of EU Law on a National Competition Authoritys Leniency Programme – the Case of Poland
Autorzy:
Sitarek, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/530320.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
competition law
leniency, antitrust damages actions
access to evidence
procedural autonomy
efficiency
public enforcement
private enforcement
Opis:
This paper is devoted to the impact of EU law on national leniency programmes, especially the Polish one. It analyses the jurisprudence of the Court of Justice in Pfleiderer, Donau Chemie and Schenker and identifies three specific areas of potential EU influence on national leniency programmes. The impact of EU law on the rules of access to leniency documents is analysed in detail on the basis of both EU and Polish law and taking into account the Draft Directive on Antitrust Damages Actions. The paper covers also the extent to which the principle of effectiveness of EU law limits the procedural autonomy of Member States in regard to their leniency programmes. This analysis covers both “negative conditions”, that is, elements of national leniency programmes which are incompatible with EU law, and “positive conditions”, in order words, those elements of domestic leniency programmes which are seen as necessary for securing their effectiveness.
L'article concerne l'influence du droit de l‘Union européenne sur les programmes de clémence nationaux, en particulier le programme polonais. La jurisprudence de la Cour de justice de l’Union européenne est analysée, surtout les arrêts en Pfleiderer, Donau Chemie et Schenker. Les trois avenues de l'influence du droit européen sur le programme de clémence sont identifiés – les règles d'accès aux confessions des entreprises bénéficiaires de la clémence, qui sont analysées en détaille, les limitations des programmes nationaux de clémence à cause du principe d'effectivité et les obligations des autorités nationales de concurrence d’assurer l'effectivité des programmes de clémence
Źródło:
Yearbook of Antitrust and Regulatory Studies; 2014, 7(9); 185-216
1689-9024
2545-0115
Pojawia się w:
Yearbook of Antitrust and Regulatory Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Transitions between Confined and Unconfined States in p-Type Asymmetric GaAs/InGaAs/AlGaAs QW Structures
Autorzy:
Sitarek, P.
Ryczko, K.
Misiewicz, J.
Reuter, D.
Wieck, A.
Powiązania:
https://bibliotekanauki.pl/articles/1492827.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.50.Pz
78.66.Fd
78.67.De
Opis:
We present contactless surface photovoltage spectroscopy and photoreflectance studies of 10 nm wide, p-type doped asymmetric GaAs/InGaAs/AlGaAs quantum well structures. The MBE grown structures differ in spacer thickness between the quantum well and the reservoir of holes. The doping causes that quantum well is placed in electric field. The surface photovoltage spectroscopy measurements gave us detailed information about the optical transitions between confined states and between confined and unconfined states. The comparison of experimental and numerical analysis allows us to identify all features present in the surface photovoltage spectroscopy and photoreflectance spectra. It has been found that spacer layer thickness has significant influence on surface photovoltage spectroscopy spectra.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 849-851
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multichannel Optical System for the Quality Control of Digital Printing
Wielokanałowy optyczny system do kontroli jakości druku cyfrowego
Autorzy:
Galas, J.
Litwin, D.
Czyżewski, A.
Sitarek, S.
Kołacz, K.
Powiązania:
https://bibliotekanauki.pl/articles/232507.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
digital printing
material deformation control
optical measurement system
fibre optics
tekstylia
druk cyfrowy
barwienie
system pomiarowy optyczny
światłowody
Opis:
Economical efficiency and environmental protection are key elements of modern textile treatment, where chemical fluids are digitally assigned to designated places in a printinglike process. Except arbitrarily designed colour patterns, technology provides the ability to add individual functionalities not achievable in the classical approach i.e. dip dyeing based processes. The precise deposition of chemicals or bonding components like microelectronic chips on a material substrate is crucial in producing multilayered fabrics. This paper demonstrates an optical monitoring system which enables the precise control of the deposition of functional materials or components on fabric. The optical system consists of a set of Fibre Optic Image Bundles (FOIB) connected to a single CCD line camera which enables the correlation in space and time of images acquired from different parts of the area monitored. During the deposition process the system measures fabric surface deformation and detects motion instability, and then adjusts the printing parameters accordingly.
Czynniki ekonomiczne oraz ochrona środowiska odgrywają kluczową rolę w nowoczesnej technice barwienia materiałów tekstylnych, w której barwniki są nakładane w procesie przypominającym drukowanie. Poza dowolnie zaprojektowanym barwnym wzorem technologia ta pozwala na dodanie indywidualnych cech produktu, co nie jest możliwe do osiągnięcia klasycznymi metodami barwienia zanurzeniowego. Precyzyjne nakładanie na materiał barwników oraz specjalizowanych komponentów, jak na przykład, struktur elektronicznych decyduje o jakości produkcji. Artykuł przedstawia optyczny system monitorujący, który ułatwia dokładne, wielowarstwowe nakładanie na tekstylia barwników i funkcjonalnych materiałów. System optyczny jest złożony z wiązki obrazowodów dołączonych do pojedynczej liniowej kamery CCD, co pozwala na korelację w czasie i przestrzeni obrazów zbieranych z różnych obszarów kontrolnych. W trakcie nakładania warstw system mierzy deformacje powierzchni płótna oraz wykrywa zakłócenia w jego przesuwie, a następnie odpowiednio modyfikuje parametry druku.
Źródło:
Fibres & Textiles in Eastern Europe; 2016, 3 (117); 95-102
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Safety Testing (Acute Systemic Toxicity in Mice) of Two Materials Prepared from Polypropylene-Polyester (Codubix S) or Acrylate Resin (Mendec Cranio) Used for the Manufacturing of a Calvaria Prosthesis
Porównawcze badanie bezpieczeństwa (ostra toksyczność ogólnoustrojowa u myszy) dwóch materiałów przygotowanych z dzianiny/plecionki polipropylenowo-poliestrowej (Codubix S) oraz żywicy akrylowej (Mendec Cranio) wykorzystywanych do produkcji protez
Autorzy:
Sujka, Witold
Latańska, Ilona
Stępnik, Maciej
Sitarek, Krystyna
Kasprzak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/234064.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
cranial implant
cranioplasty
acute toxicity
chemical analysis
polypropylene-polyester
acrylate resin
implant czaszki
plastyka czaszki
ostra toksyczność
analiza chemiczna
polipropylen-poliester
żywica akrylowa
Opis:
The aim of the study was a comparison of the acute toxicity of two popular prostheses used in the reconstruction of the bones of the skull. For the tests, the following materials were used: a polypropylene-polyester knitted Codubix S cranial bone prosthesis, made by TRICOMED SA, and polymethyl methacrylate Mednec Cranio resin. The tests were carried out in accordance with the following standards – PN-EN ISO 10993-11:2009 Biological evaluation of medical devices - Part 11: Tests for systemic toxicity, and PN-EN ISO 10993-12:2012 Biological evaluation of medical devices – Part 12: Sample preparation and reference materials. During the evaluation, adult male and female Balb/c mice were used. The animals were injected intravenously using extracts of both materials in 0.9% NaCl and intraperitoneally with the same extracts in sesame oil. The tests lasted 7 days, during which the health of the animals and their behavior were assessed. Both in the control and test groups, there was no mortality of the animals, and the health and behaviour of mice were unchanged when compared with the normal. After 7 days the internal organs of the chest and abdominal cavity of the animals were subjected to macroscopic pathomorphological examination, during which no changes indicating the toxic action of Codubix S and Mednec Cranio resin were found. Before the acute systemic toxicity tests, the chemical purity of both implants was assessed. The chemical purity of a product is one of the factors determining its biological properties. A product which is characterised by a higher degree of chemical purity contains fewer substances which may have a negative impact on biological reactions. Both prostheses meet the requirements of purity for medical devices.
Celem badania było porównanie toksyczności ostrej dwóch popularnych protez stosowanych w konstrukcji kości czaszki. Do badań użyto następujących materiałów: dzianiny polipropylenowo-poliestrowej Codubix S firmy TRICOMEX SA. I polimetakrylanu metylu Mednec Cranio. Badania przeprowadzono zgodnie z następującymi normami PN-EN ISO 10993-11: 2009 Biologiczna ocena wyrobów medycznych. Część 11: Badania toksyczności systemowej i PN-EN ISO 10993-12: 2012 Biologiczna ocena wyrobów medycznych Część 12: Przygotowanie próbek i materiały referencyjne. Podczas oceny wykorzystano dorosłe samce i samice myszy Balb /c. Zwierzętom wstrzyknięto: dożylnie stosując ekstrakty obu materiałów w 0,9% NaCl i dootrzewnowo z tymi samymi ekstraktami w oleju sezamowym. Testy trwały 7 dni, podczas których oceniano zdrowie zwierząt i ich zachowanie. Zarówno w grupach kontrolnych, jak i testowych nie stwierdzono śmiertelności zwierząt, zdrowie i zachowanie myszy pozostały nie zmienione w porównaniu ze zwykłymi. Po 7 dniach narządy wewnętrzne klatki piersiowej i jamy brzuszne j zwierząt poddano makroskopowemu badaniu patomorfologicznemu, podczas którego nie stwierdzono zmian wskazujących na toksyczne działanie żywicy Codubix S i Mednec Cranio. Przed badaniami ostrej toksyczności ogólnoustrojowej oceniano czystość chemiczną obu implantów. Chemiczna czystość produktu jest jednym z czynników określających jego właściwości biologiczne. Produkt, który charakteryzuje się wyższym stopniem czystości chemicznej, zawiera mniej substancji, które mogą mieć negatywny wpływ na reakcje biologiczne. Obie protezy spełniają wymagania czystości dla wyrobów medycznych.
Źródło:
Fibres & Textiles in Eastern Europe; 2019, 5 (137); 82-88
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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