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Wyświetlanie 1-15 z 67
Tytuł:
Abrasive-wear Resistance of Austenitic Cast Iron
Autorzy:
Medyński, D.
Janus, A.
Powiązania:
https://bibliotekanauki.pl/articles/380382.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
abrasive wear
austenitic cast iron
heat treatment
nickel equivalent
transformation of austenite
zużycie ścierne
żeliwo austenityczne
obróbka cieplna
nikiel
transformacja austenitu
Opis:
A research of wear resistance of an austenitic cast iron with higher resistance to abrasive-wear and maintained corrosion resistance characteristic for Ni-Resist cast iron is presented. For the examination, structure of raw castings was first formed by proper selection of chemical composition (to make machining possible). Next, a heat treatment was applied (annealing at 550 °C for 4 hours followed by air cooling) in order to increase abrasive-wear resistance. One of the factors deciding intensity of wear appeared to be the chilling degree of castings. However, with respect to unfavourable influence of chilling on machining properties, an important factor increasing abrasive-wear resistance is transformation of austenite to acicular ferrite as a result of annealing non-chilled castings. Heat treatment of non-chilled austenitic cast iron (EquNi > 16%) resulted in much higher abrasive-wear resistance in comparison to the alloy having pearlitic matrix at ambient temperature (EquNi 5.4÷6.8%).
Źródło:
Archives of Foundry Engineering; 2018, 18, 3; 43-48
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza efektywności gospodarowania przedsiębiorstw przemysłowych w Polsce
Analysis of economic efficiency of industrial enterprises in Poland
Autorzy:
Masternak-Janus, A.
Powiązania:
https://bibliotekanauki.pl/articles/399439.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
efektywność
Data Envelopment Analysis (DEA)województwa
przedsiębiorstwa
efficiency
Data Envelopment Analysis (DEA)
voivodships
enterprises
Opis:
Efektywność to stosunek uzyskanych efektów do poniesionych nakładów. Pomiar efektywności jest kwestią niezwykle ważną, ponieważ dostarcza informacji odnośnie skuteczności podejmowanych działań. Celem artykułu jest określenie efektywności technologicznej przedsiębiorstw przemysłowych w przekroju wojewódzkim z wykorzystaniem jednego z wariantów metody DEA – modelu CCR zorientowanego na nakłady. Wykonana analiza pozwoliła na utworzenie rankingu województw odnośnie sprawności przekształcania przez przemysł nakładów w efekty.
Efficiency is expressed as a ratio between the effects and expenditures. Measurement of efficiency is a very important matter because it provides information about effectiveness of undertaken actions. This article presents the use of one of versions of the DEA method – the input-oriented CCR model, to determine the technological effectiveness of industrial enterprises in Polish provinces. The analysis gives a possibility to create a ranking of regions concerning the efficiency of the transformation of expenditures in effects by industrial enterprises.
Źródło:
Ekonomia i Zarządzanie; 2013, 5, 4; 111-126
2080-9646
Pojawia się w:
Ekonomia i Zarządzanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Stress and Strain Fields in and around Inclusions of Various Shapes in a Cylindrical Specimen Loaded in Tension
Autorzy:
Neimitz, A.
Janus, U.
Powiązania:
https://bibliotekanauki.pl/articles/354166.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
void nucleation
inclusion fracture
critical
Opis:
A numerical analysis is performed of the stress field in and around inclusions of various shapes. Inclusions both stiffer and more compliant than the metal matrix are analysed. The critical stresses required for inclusion fracture are estimated after observation of cavities and inclusions by scanning electron microscopy. Real inclusions were observed after performing uniaxial loading to different amounts of overall strain. The material tested was Hardox-400 steel.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 569-576
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the effectiveness of sexed semen in a selected herd of dairy cows
Analiza efektywności wykorzystania nasienia seksowanego u krów mlecznych w wybranym stadzie
Autorzy:
Januś, E.
Sablik, P.
Święciło, A.
Powiązania:
https://bibliotekanauki.pl/articles/29433601.pdf
Data publikacji:
2022
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
animal breeding
dairy cow
artificial insemination
sexed semen
reproductive parameter
Źródło:
Acta Scientiarum Polonorum. Zootechnica; 2022, 21, 2; 9-18
1644-0714
Pojawia się w:
Acta Scientiarum Polonorum. Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of the dielectric barrier discharge for helium ash measurements in the divertor region
Autorzy:
Książek, I.
Brosławski, A.
Janus, H.
Pawelec, E.
Powiązania:
https://bibliotekanauki.pl/articles/148807.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dielectric barrier discharge (DBD)
low pressure discharge
fusion plasma
Opis:
Controlled fusion based on the magnetic confinement of the plasma is one of the main aims of the Eurofusion programme. In the fusion device, the hydrogen isotopes, in nuclear reactions, will produce helium nuclei. The products, as the ash, will be removed from the plasma in the region of the so-called divertor. Controlling the helium to hydrogen ratio in this ‘exhaust gas’ will provide information about the efficiency of the fusion process as well as of the efficiency of the helium removal system. One of the methods to perform this task is to study the properties of the discharge conducted in such exhaust gas. In this paper, the applicability of the dielectric barrier discharge (DBD) is studied. This preliminary experiment shows a great potential in applicability of this kind of discharge. The optical as well as pulse-height spectra were studied, both revealing very promising properties. In the optical spectrum, one can observe well separated hydrogen and helium spectral lines, with intensities of the same order of magnitude. Moreover, in the registered spectral region, the molecular spectra are negligible. The pulse-height spectra reveal very distinct shape in helium and hydrogen. Checking of this spectrum could provide parallel (redundant) information about the partial pressure of helium in the magnetic confinement fusion (MCF) device exhaust gas.
Źródło:
Nukleonika; 2016, 61, 2; 99-102
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Dot-Ring Nanostructure to Control Electrical Transport in the Coulomb Blockade Regime
Autorzy:
Janus-Zygmunt, I.
Kędzierska, B.
Gorczyca-Goraj, A.
Kurpas, M.
Maśka, M.
Zipper, E.
Powiązania:
https://bibliotekanauki.pl/articles/1376091.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.Hk
73.21.La
73.22.-f
Opis:
Transport properties of a two-dimensional nanostructure composed of a quantum dot surrounded by a quantum ring (dot-ring nanostructure), are discussed. This complex system is a highly controllable object. Conduction through dot-ring nanostructure depends crucially on the coupling strength of its states to the electrodes, which is related to the spatial distribution of the electron's wave functions in dot-ring nanostructure. This distribution can be strongly modified, e.g., by the electrical gating so that the ground and excited states move between the inner dot and the outer ring. In this paper we show that this property can be used to control single-electron DC current through dot-ring nanostructure in the Coulomb blockade regime so that it can be used as a single electron transistor.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1171-1173
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania powierzchni panewki stawu biodrowego po dziesięciu latach kontaktu z organizmem
Investigations of a hip joint surface after 10 years of use in vivo
Autorzy:
Cieślik, M.
Mlekodaj, K.
Janus, A. M.
Łojewski, T.
Engvall, K.
Kotarba, A.
Powiązania:
https://bibliotekanauki.pl/articles/286000.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
staw biodrowy
implanty
powierzchnia implantu
hip joint surface
implants
in vivo
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 54-56
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon modified TiO2 photocatalysts for water purification
Autorzy:
Morawski, A.W.
Janus, M.
Tryba, B.
Toyoda, M.
Tsumura, T.
Inagaki, M.
Powiązania:
https://bibliotekanauki.pl/articles/779326.pdf
Data publikacji:
2009
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
TiO2/AC
TiO2 dopowany węglem
TiO2 pokryty węglem
fotokataliza
carbon-doped TiO2
carbon-coated TiO2
photocatalysis
Opis:
Carbon can form different structures with TiO2: carbon-doped TiO2, carbon coated TiO2 and composites of TiO2 and carbon. The presence of carbon layer on the surface of TiO2 as well as the presence of porous carbon in the composites with TiO2 can increase the concentration of organic pollutants on the surface of TiO2, facilitating the contact of the reactive species with the organic molecules. Carbon-doped TiO2 can extend the absorption of the light to the visible region by the narrowing of the band gap and makes the photocatalysts active under visible light irradiation. TiO2 loaded carbon can also work as a photocatalyst, on which the molecules are adsorbed in the pores of carbon and then they undergo the photocatalytic decomposition with UV irradiation. Enhanced photocatalytic activity for the destruction of some organic compounds in water was noticed on the carbon coated TiO2 and TiO2 loaded activated carbon, mostly because of the adsorptive role of carbon. However, in carbon-doped TiO2, the role of carbon is somewhat different, the replacement of carbon atom with Ti or oxygen and formation of oxygen vacancies are responsible for extending its photocatalytic activity towards the visible range.
Źródło:
Polish Journal of Chemical Technology; 2009, 11, 2; 46-50
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of albumin secondary structure after palmitic acid binding : FT-IR spectroscopic study
Autorzy:
Oleszko, A
Hartwich, J.
Gąsior-Głogowska, M.
Olsztyńska-Janus, S.
Powiązania:
https://bibliotekanauki.pl/articles/307332.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
kwas palmitynowy
albumina
spektrometria FTIR
palmitic acid
albumin
Fourier transform infrared spectroscopy
protein secondary structure
Opis:
Purpose: Albumin is an universal transport protein. Plasma pool of free fatty acids arising from triglyceride hydrolysis, critical in energy metabolism and etiology of metabolic disorders is transported by albumin. According to various studies albumin has from seven to nine binding sites with diverse affinity to long chain fatty acids. X-ray diffraction crystallography measurements have provided data only for pure human serum albumin or albumin with fully saturated binding sites. These results have shown that amount of -helices is higher after fatty acids binding. Molecular mechanics simulations suggest that binding of fatty acids in two high-affinity sites leads to major conformational changes in albumin structure. The aim of this research was to investigate albumin secondary structure upon gradually increasing fatty acids to protein mole ratio. Methods: Fourier transform infrared spectroscopy was applied to study changes of bovine serum albumin (as an analogue of human serum albumin) -helical structures after binding palmitic acid in a range of 0–20 palmitic acid: albumin molar ratios representing pure protein, partial, full saturation and excess binding sites capacity. Results: Amount of -helices was increasing along with the amount of palmitic acid: bovine serum albumin molar ratio and reached maximum value around 2 mol/mol. Conclusions: Our studies confirmed molecular mechanics simulations and crystallographic studies. Palmitic acid binding in two high-affinity sites leads to major structural changes, filling another sites only slightly influenced bovine serum albumin secondary structure. The systematic study of fatty acids and albumin interactions, using an experimental model mimicking metabolic disorders, may results in new tools for personalized nanopharmacotherapy.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 1; 59-64
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of markers of cell proliferation in canine mast cell tumours according to current classifications
Autorzy:
Kandefer-Gola, M.
Madej, J.A.
Dzimira, S.
Nowak, M.
Janus, I.
Ciaputa, R.
Powiązania:
https://bibliotekanauki.pl/articles/30254.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The study aimed at immunohistochemical analysis of various markers of cell proliferation and comparison of the results with canine mast cell tumours grading systems according to the Patnaik and Kiupel. Tissue sections were stained using classical technique with haematoxylin and eosin, and immunohistochemical studies were performed with Ki-67, PCNA and MCM-3 antibodies. Additionally the mitotic index was assessed. Statistical analysis including rank correlation Spearman's and ANOVA Friedman analysis was performed. The significance was set at p<0.05. Expression of all examined antigens was detected. The results obtained allow concluding that there is a strong relationship between all the cell markers. However, due to the very strong response and positive reaction in the majority of tumours PCNA is not recommended as a prognostic indicator. Ki-67 and MCM-3 can be successfully used in the evaluation of canine mast cell tumours.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consider reactive separations
Autorzy:
Kołodziej, A.
Jaroszyński, M.
Janus, B.
Kleszcz, T.
Powiązania:
https://bibliotekanauki.pl/articles/347029.pdf
Data publikacji:
2010
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
reactive distillation
structure catalytic packing
esterification
etherification
Opis:
Reactive separation (RS) is the combination of a chemical (catalytic) reaction and a separation technique. For reactive distillation (RD), the reaction is combined with distillation. Rapid development of RS is the result of growing environmental demands and increasing energy costs. Several processes are performed using RD, such as esterification, etherification (fuel antiknocks), and hydrodesulphurisation. Other RS techniques also develop rapidly. However, the success has not come without some serious problems. The heterogeneous proton catalysts still do not meet the requirements of many processes. The column internals with a built-in catalyst are rather sparse and expensive and their characteristics are not studied well enough. Therefore intensive studies are still being performed. This study presents a brief summary of the processes realisable with the usage of reactive distillation, catalysts, and column internals. Some interesting research results and application examples are also quoted.
Źródło:
Ars Separatoria Acta; 2009-2010, 7; 11-20
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilatometric Research of High-quality Nodular Cast Iron
Autorzy:
Medyński, D.
Janus, A.
Powiązania:
https://bibliotekanauki.pl/articles/380654.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy cast iron
austenitic cast iron
dilatometric research
martensitic transformation
nickel equivalent
żeliwo stopowe
żeliwo austenityczne
badania dylatometryczne
przemiana martenzytyczna
ekwiwalent niklowy
Opis:
In the research, relationships between matrix structure and hardness of high-quality Ni-Mn-Cu cast iron containing nodular graphite and nickel equivalent value were determined. Nickel equivalent values were dependent on chemical composition and differences between them resulted mostly from nickel concentration in individual alloys. Chemical compositions of the alloys were selected to obtain, in raw condition, austenitic and austenitic-martensitic cast iron. Next, stability of matrix of raw castings was determined by dilatometric tests. The results made it possible to determine influence of nickel equivalent on martensite transformation start and finish temperatures.
Źródło:
Archives of Foundry Engineering; 2018, 18, 2; 163-168
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dye decomposition on P25 with enhanced adsorptivity
Autorzy:
Janus, M.
Wawrzyniak, B.
Tryba, B.
Morawski, A.W.
Powiązania:
https://bibliotekanauki.pl/articles/779704.pdf
Data publikacji:
2008
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
fotokatalizator
N-domieszkowanie
dwutlenek tytanu
barwnik azowy
visible-light active photocatalyst
N-doped
titanium dioxide
azo dye
Opis:
The preparation method and the activity of the TiO2-P25/N doped photocatalyst based on commercial titanium dioxide (TiO2 AeroxideŽ P-25 Degussa, Germany) are presented. For the TiO2-P25/N preparation TiO2-P25 and gaseous ammonia were kept in a pressure reactor (10 bars) for 4 hours at the temperature of 200°C. This modification process changed the chemical structure of the TiO2 surface. The formation of NH4+ groups was confirmed by the FTIR measurements. Two bands in the range of ca. 1430 - 1440 cm-1 attributed to bending vibrations of NH4+ could be observed on the FTIR spectra of the catalysts modified with ammonia and the band attributed to the hydroxyl groups at 3300 - 3500 cm-1, which were not reduced after N-doping. The photocatalytic activity of the photocatalysts was checked through the decomposition of two dyes under visible light irradiation. The modified TiO2 thus prepared samples were more active than TiO2-P25 for the decomposition of dyes under visible light irradiation.
Źródło:
Polish Journal of Chemical Technology; 2008, 10, 2; 11-16
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of alloying elements on solidification of primary austenite in Ni-Mn-Cu cast iron
Autorzy:
Janus, A.
Kurzawa, A.
Powiązania:
https://bibliotekanauki.pl/articles/382123.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
primary austenite
solidification process
austenitic cast iron
Ni-Mn-Cu cast iron
austenit pierwotny
proces krzepnięcia
żeliwo austenityczne
żeliwo Ni-Mn-Cu
Opis:
Within the research, determined were direction and intensity of alloying elements influence on solidification way (directional or volumetric) of primary austenite dendrites in hypoeutectic austenitic cast iron Ni-Mn-Cu. 50 cast shafts dia. 20 mm were analysed. Chemical composition of the alloy was as follows: 1.7 to 3.3 % C, 1.4 to 3.1 % Si, 2.8 to 9.9 % Ni, 0.4 to 7.7 % Mn, 0 to 4.6 % Cu, 0.14 to 0.16 % P and 0.03 to 0.04 % S. The discriminant analysis revealed that carbon influences solidification of primary austenite dendrites most intensively. It clearly increases the tendency to volumetric solidification. Influence of the other elements is much weaker. This means that the solidification way of primary austenite dendrites in hypoeutectic austenitic cast iron Ni-Mn-Cu does not differ from that in an unalloyed cast iron.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 93-96
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Annealing on Nature of Corrosion Damages of Medium-nickel Austenitic Cast Iron
Autorzy:
Medyński, D.
Janus, A.
Chęcmanowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/383057.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat treatment
austenitic cast iron
corrosion resistance
stability of austenite
obróbka cieplna
żeliwo austenityczne
odporność na korozję
Opis:
Within the presented research, effect of annealing on nature of corrosion damages of medium-nickel austenitic nodular cast iron castings, containing 5.5% to 10.3% Ni, was determined. Concentration of nickel, lower than in the Ni-Resist cast iron, was compensated with additions of other austenite-stabilising elements (manganese and copper). In consequence, raw castings with austenitic matrix structure and gravimetrically measured corrosion resistance increasing along with nickel equivalent value EquNi were obtained. Annealing of raw castings, aimed at obtaining nearly equilibrium structures, led to partial austenite-to-martensite transformation in the alloys with EquNi value of ca. 16%. However, corrosion resistance of the annealed alloys did not decrease in comparison to raw castings. Annealing of castings with EquNi value above 18% did not cause any structural changes, but resulted in higher corrosion resistance demonstrated by smaller depth of corrosion pits.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 85-90
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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