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Wyszukujesz frazę "Chmielewski, M.K." wg kryterium: Autor


Tytuł:
Uncovering the effects of COVID-19 on in-hospital cardiac arrest – a living systematic review and meta-analysis
Autorzy:
Bielski, K.
Pruc, M.
Rafique, Z.
Peacock, F.W.
Chmielewski, J.
Panasiuk, L.
Szarpak, L.
Bragazzi, N.L.
Chojnowska-Ćwiąkała, I.
Powiązania:
https://bibliotekanauki.pl/articles/28763041.pdf
Data publikacji:
2023
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2023, 30, 3; 498-504
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress at work as a health risk factor from the opinion of professionally active nurses
Stres w pracy jako czynnik zagrożenia zdrowia w opinii pielęgniarek i pielęgniarzy aktywnych zawodowo
Autorzy:
Dziewisz-Markowska, E.
Chmielewski, J.P.
Czerwiec, M.
Fiks, J.
Markowski, K.
Nowak-Starz, G.
Powiązania:
https://bibliotekanauki.pl/articles/2048064.pdf
Data publikacji:
2021
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
occupational stress
nurses
work
Opis:
Background. Medical workers, especially nurses, are susceptible to numerous stressful situations, due to the great demands which are a result of the specifics of working with an ill person. The aim of the study was to identify stress factors in nursing work, without taking into account the place of employment (i.e., wards). Material and methods. The study group was made up of a sample of 102 nurses, 15 male and 87 female. The diagnostic poll method and the interview technique were used, and a designed questionnaire was used as the research tool. During statistical analysis, a non-parametric χ2 test was used (p<0.05). Additionally, the strength of the examined relationships was determined (rp). Results. Work was the main source of stress (44.1%) for the participants. Of the nurses, 39.2% often felt stressed at work, whereas emotional tension was present in 25.5% of the participants constantly. Nearly half felt burdened by everyday tasks at work, while talking about the problem (55.9%) and physical activity (37.3%), including walks (19.6%), were the most frequently used forms of fighting stress. Significant relationships were found between the level of stress and the marital status and place of residence of the participants. Conclusions. Some nurses assessed the stress that accompanied them at work as being high and over half of them felt it was an average level of stress. Stress was the most often mentioned detriment-to-health factor in the opinions of the participants.
Źródło:
Health Problems of Civilization; 2021, 15, 3; 196-201
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of nanostructured bulk cobalt triantimonide doped with tellurium and indium prepared by pulsed plasma in liquid method
Autorzy:
Zybała, R.
Schmidt, M.
Kaszyca, K.
Chmielewski, M.
Kruszewski, M. J.
Jasiński, M.
Rajska, M.
Ciupiński, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/200831.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermoelectric materials
nanostructured materials
skutterudite
energy harvesting
spark plasma sintering
Opis:
One of the ways to decrease thermal conductivity is nano structurization. Cobalt triantimonide (CoSb3) samples with added indium or tellurium were prepared by the direct fusion technique from high purity elements. Ingots were pulverized and re-compacted to form electrodes. Then, the pulsed plasma in liquid (PPL) method was applied. All materials were consolidated using rapid spark plasma sintering (SPS). For the analysis, methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) with a laser flash apparatus (LFA) were used. For density measurement, the Archimedes’ method was used. Electrical conductivity was measured using a standard four-wire method. The Seebeck coefficient was calculated to form measured Seebeck voltage in the sample placed in a temperature gradient. The preparation method allowed for obtaining CoSb3 nanomaterial with significantly lower thermal conductivity (10 Wm–1K–1 for pure CoSb3 and 3 Wm–1K–1 for the nanostructured sample in room temperature (RT)). The size of crystallites (from SEM observations) in the powders prepared was about 20 nm, joined into larger agglomerates. The Seebeck coefficient, α, was about –200μVK–1 in the case of both dopants, In and Te, in microsized material and about −400 μK−1 for the nanomaterial at RT. For pure CoSb3 , α was about 150 μVK−1 and it stood at −50 μVK−1 for nanomaterial at RT. In bulk nanomaterial samples, due to a decrease in electrical conductivity and inversion of the Seebeck coefficient, there was no increase in ZT values and the ZT for the nanosized material was below 0.02 in the measured temperature range, while for microsized In-doped sample it reached maximum ZT = 0.7 in (600K).
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 125-134
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion and thermal shock resistance of metal (Cu, Al) matrix composites reinforced by SiC particles
Autorzy:
Strojny-Nędza, A.
Egizabal, P.
Pietrzak, K.
Zieliński, R.
Kaszyca, K.
Piątkowska, A.
Chmielewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/200646.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal-matrix composites
silicon carbide
wear resistance
corrosion
thermal shocks
Opis:
This paper presents the results of studies concerning the production and characterization of Al-SiC/W and Cu-SiC/W composite materials with a 30% volume fraction of reinforcing phase particles as well as the influence of corrosion and thermal shocks on the properties of selected metal matrix composites. Spark plasma sintering method (SPS) was applied for the purpose of producing these materials. In order to avoid the decomposition of SiC surface, SiC powder was coated with a thin tungsten layer using plasma vapour deposition (PVD) method. The obtained results were analysed by the effect of the corrosion and thermal shocks on materials density, hardness, bending strength, tribological and thermal properties. Qualitative X-ray analysis and observation of microstructure of sample surfaces after corrosion tests and thermal shocks were also conducted. The use of PVD technique allows us to obtain an evenly distributed layer of titanium with a constant thickness of 1.5 µm. It was found that adverse environmental conditions and increased temperature result in a change in the material behaviour in wear tests.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1227-1236
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of ceramic type reinforcement on structure and properties of Cu-Al2O3 composites
Autorzy:
Strojny-Nędza, A.
Pietrzak, K.
Gładki, A.
Nosewicz, S.
Jarząbek, D. M.
Chmielewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/201851.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal matrix composites
spark plasma sintering
thermal conductivity
interfacial strength
przewodność cieplna
kompozyty metaliczne
iskrowe spiekanie plazmowe
Opis:
The purpose of this paper is to elaborate on mechanical alloying conditions for a composite powder consisting of copper and brittle aluminium oxides. Detailed analysis of the Cu-Al2O3 powder mixture structure obtained in the mechanical alloying process allows for the study of the homogenization phenomena and for obtaining grains (in composite form) with a high degree of uniformity. The Cu-5vol.%Al2O3 composites were obtained by means of the spark plasma sintering technique. The results presented herein were studied and discussed in terms of the impact of using a different form of aluminium oxide powder and a different shape of copper powder on composite properties. Research methodology included microstructure analysis as well as its relation to the strength of Cu-Al2O3 interfaces. It transpires from the results presented below that the application of electrocorundum as a reinforcement phase in composites decreases porosity in the ceramic phase, thus improving thermal properties and interfacial strength.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 553-560
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Material Coating on the Heat Transfer in a Layered Cu-SiC-Cu Systems
Autorzy:
Strojny-Nędza, A.
Pietrzak, K.
Teodorczyk, M.
Basista, M.
Węglewski, W.
Chmielewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/350957.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper matrix composites
silicon carbide
interface
thermal conductivity
modelling
Opis:
This paper describes the process of obtaining Cu-SiC-Cu systems by way of spark plasma sintering. A monocrystalline form of silicon carbide (6H-SiC type) was applied in the experiment. Additionally, silicon carbide samples were covered with a layer of tungsten and molybdenum using chemical vapour deposition (CVD) technique. Microstructural examinations and thermal properties measurements were performed. A special attention was put to the metal-ceramic interface. During annealing at a high temperature, copper reacts with silicon carbide. To prevent the decomposition of silicon carbide two types of coating (tungsten and molybdenum) were applied. The effect of covering SiC with the aforementioned elements on the composite’s thermal conductivity was analyzed. Results were compared with the numerical modelling of heat transfer in Cu-SiC-Cu systems. Certain possible reasons behind differences in measurements and modelling results were discussed.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1311-1314
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of Interface Properties in Copper-Silicon Carbide Composites
Autorzy:
Chmielewski, M.
Pietrzak, K.
Strojny-Nędza, A.
Jarząbek, D.
Nosewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/351487.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper matrix composites
silicon carbide
interface
thermal conductivity
adhesion
Opis:
This paper analyses the technological aspects of the interface formation in the copper-silicon carbide composite and its effect on the material’s microstructure and properties. Cu-SiC composites with two different volume content of ceramic reinforcement were fabricated by hot pressing (HP) and spark plasma sintering (SPS) technique. In order to protect SiC surface from its decomposition, the powder was coated with a thin tungsten layer using plasma vapour deposition (PVD) method. Microstructural analyses provided by scanning electron microscopy revealed the significant differences at metal-ceramic interface. Adhesion force and fracture strength of the interface between SiC particles and copper matrix were measured. Thermal conductivity of composites was determined using laser flash method. The obtained results are discussed with reference to changes in the area of metal-ceramic boundary.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1315-1318
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantification of biodiversity related to the active protection of grassland habitats in the Eastern Lublin region of Poland based on the activity of soil enzymes
Autorzy:
Bielinska, E.J.
Futa, B.
Chmielewski, S.
Patkowski, K.
Gruszecki, T.M.
Powiązania:
https://bibliotekanauki.pl/articles/905442.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:
This study focused on the impact of extensive sheep grazing on soil enzymatic activity in the grassland habitats of the Eastern Lublin region of Poland, situated within the ecological Natura 2000 network of: Kąty (PLH060010), Stawska Góra (PLH060018), and Zachodniowołyńska Dolina Bugu (PLH060035). This study involved soils under sheep grazing and soils in uncultivated areas (wasteland). Two-year study was conducted in 2 periods of each year: spring (before the start of sheep grazing) and autumn (after grazing). Beneficial effects were found for extensive grazing by sheep on soil enzymatic activity within each tested habitat. It is worth underlining that a clear stimulation of enzyme activity was detected already in the first year of observation. In the second year, the enzyme activity in the soils of habitats under sheep grazing was approximately 1.5 times higher than in the soils without grazing. The observed higher activity of the tested enzymes in soils under sheep grazing indicated the usefulness of studies on the enzymatic activity of soils as a sensitive indicator of soil response, such as observed here with the applied active system of biodiversity protection in the valuable natural grassland habitats of Natura 2000.
Źródło:
Polish Journal of Soil Science; 2017, 50, 1
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Antimony Telluride for Thermoelectric and Optoelectronic Applications
Autorzy:
Zybała, R.
Mars, K.
Mikuła, A.
Bogusławski, J.
Soboń, G.
Sotor, J.
Schmidt, M.
Kaszyca, K.
Chmielewski, M.
Ciupiński, L.
Pietrzak, K.
Powiązania:
https://bibliotekanauki.pl/articles/352428.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antimony telluride
thermoelectric materials
thin films
PVD magnetron sputtering
topological insulator
Opis:
Antimony telluride (Sb2 Te3 ) is an intermetallic compound crystallizing in a hexagonal lattice with R-3m space group. It creates a c lose packed structure of an ABCABC type. As intrinsic semiconductor characterized by excellent electrical properties, Sb2 Te3 is widely used as a low-temperature thermoelectric material. At the same time, due to unusual properties (strictly connected with the structure), antimony telluride exhibits nonlinear optical properties, including saturable absorption. Nanostructurization, elemental doping and possibilities of synthesis Sb2 Te3 in various forms (polycrystalline, single crystal or thin film) are the most promising methods for improving thermoelectric properties of Sb2Te3.Applications of Sb2 Te3 in optical devices (e.g. nonlinear modulator, in particular saturable absorbers for ultrafast lasers) are also interesting. The antimony telluride in form of bulk polycrystals and layers for thermoelectric and optoelectronic applications respectively were used. For optical applications thin layers of the material were formed and studied. Synthesis and structural characterization of Sb2 Te3 were also presented here. The anisotropy (packed structure) and its influence on thermoelectric properties have been performed. Furthermore, preparation and characterization of Sb2 Te3 thin films for optical uses have been also made.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1067-1070
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Test stand and procedures for estimating parameters of microbolometer detector
Autorzy:
Krupiński, M.
Chmielewski, K.
Bareła, J.
Kastek, M.
Powiązania:
https://bibliotekanauki.pl/articles/114240.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
microbolometer parameters
non-uniformity correction
Opis:
In this paper we present a test stand and a procedures to test the functionality of a microbolometer detector. Presented test stand is integrated with temperature driver to stabilize the temperature of a black body and the detector. Digital board with implemented application allows for capturing raw data, correcting non-uniformity, testing noise, sensitivity and NETD (noise equivalent temperature difference). Integration with temperature driver allows for more accurate and repeatable measurements.
Źródło:
Measurement Automation Monitoring; 2017, 63, 2; 73-75
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal-ceramic functionally graded materials – manufacturing, characterization, application
Autorzy:
Chmielewski, M.
Pietrzak, K.
Powiązania:
https://bibliotekanauki.pl/articles/200350.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal material
ceramic material
functionally graded materials
manufacturing
characterization
application
tworzywa gradientowe
materiał metaliczny
materiał ceramiczny
produkcja
charakteryzacja
aplikacja
Opis:
Functionally graded materials (FGMs) belong to a new, continuously developing group of materials, finding application in various branches of industry. The idea of freely designing their construction profile, restricted only by the available manufacturing techniques, enables obtaining materials with composition and structure gradients having unprecedented properties. In this paper, selected results of works carried out by the authors and relating to the application of the developed metal-ceramic composites were presented in order to manufacture functionally graded materials for target purposes. Gradient structures with various construction profiles that can play different roles were produced on the basis on the following material pairs: Cr-Al2O3, NiAl-Al2O3 and Cu-AlN. Manufacturing conditions, microstructure characteristics and selected properties, crucial from the point of view of future applications, were presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 151-160
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obszary i zasoby perspektywiczne wystąpień rud metali i surowców chemicznych w Polsce na mapach w skali 1 : 200 000 wraz z ich oceną surowcową oraz ograniczeniami środowiskowymi i zagospodarowania przestrzennego
The prospective areas and resources of metal ores and chemical raw materials in Poland on the maps at a scale of 1 : 200,000 with their resource assessment in relation to environmental and spatial conflicts
Autorzy:
Mikulski, S. Z.
Oszczepalski, S.
Czapowski, G.
Gąsiewicz, A.
Sadłowska, K.
Markowiak, M.
Sztromwasser, E.
Bukowski, K.
Giełżecka-Mądry, D.
Strzelska-Smakowska, B.
Paulo, A.
Michniewicz, M.
Radwanek-Bąk, B.
Chmielewski, A.
Mądry, S.
Kuć, P.
Sikorska-Maykowska, M.
Koźma, J.
Bliźniuk, A.
Piotrowska, M.
Kostrz-Sikora, P.
Powiązania:
https://bibliotekanauki.pl/articles/2075530.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
obszary perspektywiczne
rudy metali
surowce chemiczne
ograniczenia środowiskowe
konflikt przestrzenny
mapy
Polska
prospective areas
metal ores
chemical raw materials
environmental constraints
spatial conflict
maps
Polska
Opis:
As part of the tasks performed by the Polish Geological Survey (Polish Geological Institute - National Research Institute), 260 prospective maps (MOP) at a scale of 1 : 200,000 have been developed in the period of 2013-2015. These maps were designed for metal ores (Cu-Ag, Zn-Pb, Mo-W, Ni, Sn, Au, Pt, Pd and Zn oxide ore - galmans) and chemical raw materials (rock and potash salts, gypsum, anhydrite and native sulphur), in relation to the assessment of raw materials resources and environmental restrictions and land use planning. The total surface of prospective teritories projected onto the surface area is ~15.25 thousand km2 for metal ores and ca. 52.5 thousand km2 for chemical raw materials. The estimated resources of predicted ore deposits (prognostic and prospective) are approx. 42.2 million Mg of Cu and 75 thousands Mg of Ag (12 prospective areas), ca. 20 million Mg of Zn-Pb ores (in 4 prospective areas), 32 million Mg of Ni ores of weathering type (10 prospective areas), from 9.4 to 21.5 Mg of Au encountered by orogenic vein and metasomatic deposits (7 prospective areas), and ca. 22 million Mg of Sn ores. The estimated prognostic and prospective resources of chemical raw materials (at a depth of not more than 2000 m) are: ca. 4.059 trillion Mg of rock salt (68 prospective areas) and ca. 3638.1 million Mg of potash (12 prospective areas), as well as ca. 575.6 billion Mg of gypsum and anhydrite, and 202 million Mg of native sulphur (prognostic resources). In the assessment of environmental conflicts and land use planning, 125 information data sheets developed environmental conditions for prospective areas (with the exception of rock salts, which are discussed in the regional aspect). Development of the designated prospective areas may be important in the future to ensure the availability of raw material safety, not only for Poland, but also for the European Union, thus contributing positively to economic growth and prosperity of local communities.
Źródło:
Przegląd Geologiczny; 2016, 64, 9; 657--670
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sheep and horse grazing in a large-scale protection area and its positive impact on chemical and biological soil Properties
Autorzy:
Futa, B.
Patkowski, K.
Bielinska, E.J.
Gruszecki, T.M.
Pluta, M.
Kulik, M.
Chmielewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/905462.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Opis:
This paper looks into the impact of free grazing by sheep and horses on the chemical and biological properties of soils in the partial protection zone of the Roztocze National Park. The study sampled three different types of pastureland in the area: pastures for sheep, horses and for combined grazing by sheep and horses. Compared to an ungrazed reference pasture, free grazing significantly stimulated the activity of enzymes which catalyze the transformation of organic matter (dehydrogenases, phosphatases and ureases) and it also positively influenced other chemical properties of the soils. Among the soils under free-grazing management, the pasture grazed to horses underwent the most advantageous changes in terms of the eco-chemical status of the soil.
Źródło:
Polish Journal of Soil Science; 2016, 49, 2
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ochrona pracy w zakładach leczniczych dla zwierząt w aspekcie bezpieczeństwa i higieny pracy
Occupational safety in animal clinics in the context of safety and health protection
Autorzy:
Chmielewski, J.
Galinska, E.M.
Anusz, K.
Nagas, T.
Trela, M.
Zagorski, J.
Powiązania:
https://bibliotekanauki.pl/articles/861067.pdf
Data publikacji:
2015
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Źródło:
Życie Weterynaryjne; 2015, 90, 07
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ochrona zdrowia kobiet zatrudnionych w zawodzie lekarza weterynarii
Health protection of women working as veterinary practitioners
Autorzy:
Chmielewski, J.
Wojciechowska, M.
Dutkiewicz, E.
Anusz, K.
Galinska, E.M.
Jackowska, N.
Wroblewska, P.
Zagorski, J.
Powiązania:
https://bibliotekanauki.pl/articles/862275.pdf
Data publikacji:
2015
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Źródło:
Życie Weterynaryjne; 2015, 90, 10
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł

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