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    Tytuł:
    The Outline of Selected Marital Satisfaction Factors in the Intercultural Couples based on the Westerner and non-Westerner relationships
    Autorzy:
    Skowroński, Dariusz P.
    Othman, Atifa Bte
    Siang, Daniel Tan Wen
    Han, Gabriel Lum Wei
    Yang, Jeremy Wong Jia
    Waszyńska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/430830.pdf
    Data publikacji:
    2014-09-01
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    marital satisfaction
    intercultural marriages
    socio-cultural factors
    Opis:
    The paper investigates the various factors from a socio-cultural perspective that have a bearing on the intercultural couple’s marital satisfaction in Westerner and non-Westerner relationships, and how cultural differences may potentially amplify the difficulties, which non-intercultural couples themselves are already likely to face. These factors include acculturation, language and communication, attitudes toward marriage, individual traits and behaviours, support of the family, societal views, gender roles, managing of the household finances and child rearing. Certain theories are also highlighted in an attempt to explain why these cultural differences have such a profound effect on the marital satisfaction of intercultural couples.
    Źródło:
    Polish Psychological Bulletin; 2014, 45, 3; 346-356
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Interaction of Water with Glycine: A Combined Inelastic Neutron Scattering and Raman Spectra Studies
    Autorzy:
    Zhang, P.
    Zhang, Y.
    Han, S.
    Yan, Q.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044762.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.20.Ng
    87.64.Je
    25.40.Fq
    82.30.Rs
    Opis:
    The vibrational dynamics of water around glycine was investigated by using Raman spectroscopy and inelastic neutron scattering. Experiments of deuterated glycine versus deuterium were performed as comparison. The study shows that for glycine, the exchange of proton-deuteron on the active NH$\text{}_{3}^{+}$ side was easy, whereas there was hardly exchange on the CH$\text{}_{2}$ side. Comparing different proportion of glycine vs. water molecules we obtained that the presence of water hardly changes the main features of glycine illustrating its hydrophobic character. The intralayer hydrogen bonds of glycine crystal are difficult to be replaced due to its stronger bond than water.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 399-404
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of topology and vortex structure in turbine cascades with tip clearance under different incidence angles
    Badania topologii i struktury wirów palisady turbiny z luzem wierzchołkowym przy różnych kątach natarcia
    Autorzy:
    Yan, P. G.
    Qiang, X. Q.
    Teng, J. F.
    Han, W. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/279519.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    turbine cascade
    tip clearance
    topological rules
    experimental study
    Opis:
    Three sets of conventional straight, positive curved and negative curved turbine cascades with tip clearance were tested with experimental measurement. The impact of incidence angles and blade bending on the tip leakage was studied under larger clearance (0.036 of span). An ink trace visualization of the wall flow and topology theory was adopted and thus the topological structures of the blade surface, the upper and lower end wall were analyzed in this paper. It was found that, compared with the same cascade under the zero incidence angle, the saddle points all move to the upstream, the scope of the separation expands along the flow and span direction, and the separation line of the upper and lower passage vortex climb to the middle span of the blade when the flow incidence angle increased from zero to 20º. Under the condition of zero and 20º incidence angle, the positive curved blade will eliminate the upper passage vortex. The numbers of singular points are reduced and the interaction loss between the passage vortex and the leakage vortex is greatly reduced too. On the other hand, it also strengthens the blocking effect of the end wall cross flow on the leakage flow, thereby reduces the relative leakage flow rate.
    W pracy zaprezentowano wyniki pomiarów eksperymentalnych trzech zestawów konwencjonalnych palisad turbin o prostym, dodatnio i ujemnie zakrzywionym profilu. Zbadano wpływ kąta natarcia oraz efekt zginania łopatek na straty wskutek upływu przy luzie wierzchołkowym sięgającym 3.6% rozpiętości łopatek. Do analizy zastosowano wizualizację śladów pozostawianych barwnikiem oraz teorię topologii, tj. struktur topologicznych reprezentujących powierzchnię łopatki oraz górnej i dolnej ściany krańcowej. Zaobserwowano, że w porównaniu do analogicznej palisady o zerowym kącie natarcia wszystkie punkty siodłowe przesuwają się w gorę przepływu, a obszar oderwania strugi rozszerza się wzdłuż promienia łopatki. Jednocześnie granica oderwania górnego i dolnego wiru przemieszcza się ku środkowi łopatki, gdy kąt natarcia narasta od zera do 20◦. Przy tych granicznych wartościach kąta natarcia łopatki o dodatniej krzywiźnie profilu eliminują górny wir podczas przejścia. Ponadto okazało się, że liczba punktów osobliwych zmniejszyła się podobnie, jak osłabiła się interakcja pomiędzy wirami przejścia i wirami upływu. Stwierdzono, że wzmacnia to efekt blokowania upływu poprzecznym przepływem na krańcowej ścianie łopatki, co ostatecznie redukuje straty indukowane upływem.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 363-373
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remediation of polluted waters and wastewater by radiation processing
    Autorzy:
    Sampa, M. H. O.
    Takács, E.
    Gehringer, P.
    Rela, P. R.
    Ramirez, T.
    Amro, H.
    Trojanowicz, M.
    Botelho, M. L.
    Han, B.
    Solpan, D.
    Cooper, W. J.
    Emmi, S. S.
    Wojnárovits, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/147644.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam
    wastewater treatment
    pesticides
    dyes
    degradation
    radiation technology
    Opis:
    Application of radiation processing for drinking water, wastewater, and groundwater treatment is a cost effective process which may insure adequate availability of that resource worldwide. This paper summarizes the results of a Coordinated Research Project (organized by the IAEA) with participants from 10 countries with the purpose of describing the degradation mechanism of organic impurities, and establishing optimal treatment conditions. Decoloration, disinfection, microbiological and toxicological experiments are also mentioned. These experiments led to pilot plants and also to a large scale industrial realization of radiation technology.
    Źródło:
    Nukleonika; 2007, 52, 4; 137-144
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of Thermal Conductivity Through Complex Microstructure by Dispersion of Carbon Nanofiber in p-Type Bi0.5Sb1.5Te3 Alloys
    Autorzy:
    Sharief, P.
    Madavali, B.
    Sohn, Y.
    Han, J. H.
    Song, G.
    Hong, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049341.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bismuth telluride
    carbon nano fiber
    grain size
    Thermal conductivity
    ZT
    Opis:
    The influence of nano dispersion on the thermoelectric properties of Bi2Te3 was actively investigating to wide-spread thermoelectric applications. Herein this report, we have systematically controlled the microstructure of Bi0.5Sb1.5Te3 (BST) alloys through the incorporation of carbon nanofiber (CNF), and studied their effect on thermoelectric properties, and mechanical properties. The BST/x-CNF (x-0, 0.05, 0.1, 0.2 wt.%) composites powder was fabricated using high energy ball milling, and subsequently consolidated the powder using spark plasma sintering. The identification of CNF in bulk composites was analyzed in Raman spectroscopy and corresponding CNF peaks were recognized. The BST matrix grain size was greatly reduced with CNF dispersion and consistently decreased along CNF percentage. The electrical conductivity was reduced and Seebeck coefficient varied in small-scale by embedding CNF. The thermal conductivity was progressively diminished, obtained lattice thermal conductivity was lowest compared to bare sample due to induced phonon scattering at interfaces of secondary phases as well as highly dense fine grain boundaries. The peak ZT of 0.95 achieved for 0.1 wt.% dispersed BST/CNF composites. The Vickers hardness value of 101.8 Hv was obtained for the BST/CNF composites.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 803-808
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osteology of the Late Cretaceous alvarezsauroid Linhenykus monodactylus from China and comments on alvarezsauroid biogeography
    Autorzy:
    Xu, X.
    Upchurch, P.
    Ma, Q.
    Pittman, M.
    Choiniere, J.
    Sullivan, C.
    Hone, D.W.E.
    Tan, Q.
    Tan, L.
    Xiao, D.
    Han, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/20629.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    osteology
    Cretaceous
    Late Cretaceous
    alvarezsauroid
    Linhenykus monodactylus
    China
    biogeography
    Dinosauria
    Theropoda
    Parvicursorinae
    Treefitte
    dispersal
    vicariance
    sympatry
    Wulansuhai Formation
    Inner Mongolia
    Opis:
    The alvarezsauroid theropod Linhenykus monodactylus from the Upper Cretaceous of Inner Mongolia, China is the first knownmonodactyl non−avian dinosaur, providing important information on the complex patterns of manual evolution seen in alvarezsauroids. Herewe provide a detailed description of the osteology of this taxon. Linhenykus shows a number of fea− tures that are transitional between parvicursorine and non−parvicursorine alvarezsauroids, but detailed comparisons also re− veal that some characters had a more complex distribution. We also use event−based tree−fitting to perform a quantitative analysis of alvarezsauroid biogeography incorporating several recently discovered taxa. The results suggest that there is no statistical support for previous biogeographic hypotheses that favour pure vicariance or pure dispersal scenarios as explana− tions for the distributions of alvarezsauroids across SouthAmerica, NorthAmerica andAsia. Instead, statistically significant biogeographic reconstructions suggest a dominant role for sympatric (or “within area”) events, combined with a mix of vicariance, dispersal and regional extinction. At present the alvarezsauroid data set is too small to completely resolve the biogeographic history of this group: future studies will need to create larger data sets that encompass additional clades.
    Źródło:
    Acta Palaeontologica Polonica; 2013, 58, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of compressor rotor blade clocking effects on aerodynamic loading of the stator vane
    Analiza numeryczna wpływu wzajemnego ustawienia łopat sprężarki na obciążenie aerodynamiczne kierownicy
    Autorzy:
    Yan, P. G.
    Qiang, X. Q.
    Du, Z. H.
    Han, W. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/280439.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    compressor
    unsteady low
    clocking effect
    flow exciting force
    Opis:
    The unsteady flow fields of a three-stage axial compressor are simulated. The 3D N-S equations are solved by using the frequency domain transformed method based on the harmonic function. The main efforts are focused on the effects of the second stage rotor blade clocking configuration on aerodynamic loading of the stator vanes. The unsteady aerodynamic loadings of each blade row are analyzed in time and frequency domains. The results point out that the aerodynamic loading of the middle stage stator vane is significantly affected as the rotor blades changing with different clocking configuration. At CLK0 configuration, the middle stage stator vane is affected by the aerodynamic force whose direction is sometimes reverse with the regular force. At CLK2 configuration, the aerodynamic force of the stator vane is always positive and the fluctuation amplitude is smaller than those of other configurations. Meanwhile, the response of stator vane S2 to one blade passing frequency (BPF) is minimum comparing to others.
    Praca zawiera wyniki symulacji numerycznej nieustalonego pola przepływu w trójstopniowej sprężarce osiowej. Trójwymiarowe równania Naviera-Stokesa rozwiązano metodą transformacji w dziedzinie częstości opartej na funkcji harmonicznej. Główny wysiłek włożono w badania wpływu konfiguracji łopat kierownicy i wirnika drugiego stopnia sprężarki na obciążenie aerodynamiczne kierownicy. Obciążenie to o charakterze nieustalonym przeanalizowano dla każdego rzędu łopatek w dziedzinie czasu i częstości. Wyniki wykazały, że obciążenie aerodynamiczne kierownicy środkowego stopnia sprężarki znacząco zależy od wzajemnego ustawienia łopat wirnika i kierownicy. Dla konfiguracji oznaczonej CLK0 kierownica podlega obciążeniu siłą, której zwrot bywa przeciwny do kierunku typowego w przypadkach regularnych. Natomiast konfiguracją CLK2 generuje zawsze dodatnią wartość siły aerodynamicznej, której fluktuacje amplitudy są jednocześnie mniejsze niż w innych konfiguracjach. Ponadto stwierdzono, że wrażliwość aerodynamiczna łopaty kierownicy S2 na częstotliwość łopatkową (BPF) jest minimalna w stosunku do innych konfiguracji.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2012, 50, 2; 423-440
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multivariate statistical analysis of water quality and phytoplankton characteristics in Daya Bay, China, from 1999 to 2002
    Autorzy:
    Wang, Y.S.
    Lou, Z.P.
    Sun, C.C.
    Wu, M.L.
    Han, S.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/48049.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    South China Sea
    water quality
    China
    phytoplankton
    Daya Bay
    multivariate statistical analysis
    Opis:
    This study analyzed seasonal physicochemical and phytoplankton data collected at 12 marine monitoring stations in Daya Bay from 1999 to 2002. Cluster analysis based on water quality and phytoplankton parameters measured at the 12 stations could be grouped into three clusters: cluster I – stations S1,S2 , S7 and S11 in the southern part and the north-eastern part of Daya Bay; cluster II – stations S5, S6,S9 ,S1 0 and S12 in the central and north-eastern parts of Daya Bay; cluster III – stations S3,S 4 and S8 in the cage culture areas in the south-western part of Daya Bay and in the north-western part of the Bay near Aotou harbor. Bivariate correlations between phytoplankton density and the major physical and nutrient factors were calculated for all stations. Factor analysis shows that there were high positive loadings of pH,T IN and the ratio of TIN to PO4-P in the three clusters, which indicates that all the stations in the three clusters were primarily grouped according to their respective nutrient conditions.
    Źródło:
    Oceanologia; 2006, 48, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interaction between mineral particles during ascharite flotation process and direct force measurement using AFM
    Autorzy:
    Li, Z.
    Han, Y.
    Li, Y.
    Gao, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/110122.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ascharite
    serpentine
    quartz
    interaction
    AFM
    DLVO
    Opis:
    Interaction between mineral particles during ascharite flotation was investigated by flotation, zeta potential, Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, atomic force microscope (AFM) and SEM-EDS tests. Flotation results showed that the ascharite recovery decreased significantly in the presence of serpentine. In order to improve the ascharite recovery, negative charged quartz was used to limit the detrimental effect of serpentine on ascharite flotation in this research. The effect of quartz on improving ascharite recovery was attributed to the particle surface interactions. The DLVO theory was applied to study the particles interaction in the aqueous solution. The fitting curves showed that serpentine could attach to the surface of quartz easily, and quartz would be well dispersed with ascharite. Therefore, quartz can improve the ascharite flotation performance effectively by interaction between particles. Zeta potential tests showed the opposite charges on the surfaces of mineral particles, which was the basic reason leading to particles interaction. The force measurement results of AFM indicated that the attraction force existed between serpentine and ascharite, as well as serpentine and quartz, but the force between quartz and ascharite was repulsive. The DLVO theory was in a good agreement with the results of AFM. Eventually, particles coating were observed by SEM-EDS, which supported the results of DLVO theory and AFM measurements. During the flotation process, addition of quartz would lead to attachment of serpentine to the quartz surface, so the adverse effect of serpentine on decreasing floatability of ascharite was weakened.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1161-1174
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global well-posedness and scattering for the focusing nonlinear Schrödinger equation in the nonradial case
    Autorzy:
    Han, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/254861.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    critical energy
    focusing Schrodinger equation
    global well-posedness
    scattering
    Opis:
    The energy-critical, focusing nonlinear Schrödinger equation in the nonradial case reads as follows: [formula]. Under a suitable assumption on the maximal strong solution, using a compactness argument and a virial identity, we establish the global well-posedness and scattering in the nonradial case, which gives a positive answer to one open problem proposed by Kenig and Merle [Invent. Math. 166 (2006), 645-675].
    Źródło:
    Opuscula Mathematica; 2012, 32, 3; 487-504
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatty Acid Composition and Anticancer Activity of Neutral and Polar Lipids of Pacific Oyster (Crassostrea gigas) Cultured in Khanh Hoa Coast in Vietnam
    Autorzy:
    Nguyen, Minh V.
    Kakooza, Derrick
    Do, Thi Hong Tuoi
    Tran, Anh P.
    Nguyen, Han T.
    Tran, Ngoc Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/31341116.pdf
    Data publikacji:
    2024-05-24
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    anticancer activity
    fatty acid profile
    lipid fraction
    n3/n6 ratio
    thrombogenicity
    Opis:
    In this study, we investigated the fatty acid composition and anticancer activity of neutral and polar lipid fractions extracted from Crassostrea gigas oysters cultured in Nha Phu Lagoon, Khanh Hoa Coast, harvested during the five months of January, April, May, September, and November. Analysis revealed that saturated fatty acids (SFAs) were the most abundant fatty acids in the neutral lipid fraction, followed by monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs). Conversely, the polar lipid fraction exhibited a different order, with PUFAs being the most abundant, followed by MUFAs and SFAs. Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) were identified as the most prevalent polyunsaturated fatty acids, while oleic acid and palmitic acid were the predominant monounsaturated and saturated fatty acids, respectively. Notably, the combined content of EPA and DHA in the polar lipid fraction consistently exceeded 30% throughout all five months of analysis. Thrombogenicity index (TI) values ranged from 0.13 to 0.29 for the polar lipid fraction and from 0.6 to 1.1 for the neutral lipid fraction. Moreover, the polar lipid fraction exhibited significantly higher n3/n6 ratios compared to the neutral lipid fraction. The polar lipid fraction exhibited stronger inhibitory effects on the growth of the three cancer cell lines (HepG2, MDA-MB-231, and RD) compared to the neutral lipid fraction. The findings of the present study show that lipids extracted from C. gigas oysters cultured in Khanh Hoa Coast have a weak anticancer activity but may still aid in prevention and treatment of certain cancer types.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 169-176
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of calcination temperature on activation behaviors of coal-series kaolin by fluidized bed calcination
    Autorzy:
    Yuan, S.
    Han, Y.
    Li, Y.
    Gao, P.
    Yu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/109800.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coal-series kaolin
    fluidized bed calcination
    calcination temperature
    activation behaviors
    Opis:
    This paper is aimed at investigating activation behaviors for coal-series kaolin using fluidized bed calcination as a novel method. The properties of calcined products at different temperature by fluidized bed calcination were evaluated by determination of weight loss rate, whiteness, chemical oxygen demand (COD), aluminum dissolution degree. The thermal behaviors and reaction mechanism were characterized by thermo gravimetric-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), particle size distribution (PSD) and scanning electron microscopy (SEM). The results showed that calcination temperature was essential factor determining the properties and crystallinity of calcined products using fluidized bed calcination. Coal-series kaolin transformed into irregular and amorphous metakaolin with excellent properties as calcined at 600-900 °C, which attributed to the dehydroxylation of kaolinite and combustion of carbon/organic matter. Calcined kaolin eliminated activity ascribed to the recrystallization into mullite when calcination temperature was over 1000 °C. It was believed that fluidized bed calcination was an efficient thermal activation technology for coal-series kaolin and the calcination temperature should be controlled accurately.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 590-600
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the average maintenance time of CNC machine tools based on type II failure correlation
    Określenie średniego czasu konserwacji obrabiarek CNC w oparciu o korelację awarii typu II
    Autorzy:
    Shen, G.
    Zeng, W.
    Han, C.
    Liu, P.
    Zhang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/300892.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    obrabiarki CNC
    średni czas konserwacji
    korelacja awarii typu II
    DEMATE /ISM
    funkcja kopuły
    CNC machine tools
    Average maintenance time
    Type II failure correlation
    DEMATEL/ISM
    copula function
    Opis:
    An average maintenance time calculation method based on components failure correlation analysis is proposed to revise the traditional system maintenance time. This paper focus on complex system type II fault correlation, using the Decision-making trial and evaluation laboratory / Interpretative structural model method to divide the fault level of components. And the copula connection function is introduced to calculation of failure rate function of failure correlation components. In addition, the system maintenance time model is established by synthesizing the failure rate function of each unit of the system. Moreover, the average maintenance time under the minimum number of failures is determined. This method shows that the minimum average maintenance time of the proposed system is more reasonable than the traditional one and provides the basis for system and component reliability design.
    W artykule zaproponowano metodę obliczania średniego czasu konserwacji, opartą na analizie korelacji uszkodzeń elementów składowych systemu. Metoda ta ma na celu rewizję tradycyjnego czasu konserwacji systemu. Głównym tematem pracy jest korelacja awarii typu II występujących w systemach złożonych. Elementy systemu podzielono ze względu na poziom uszkodzenia przy użyciu metody DEMATEL w połączeniu z interpretacyjnym modelowaniem strukturalnym. Funkcję intensywności skorelowanych uszkodzeń elementów systemu obliczono za pomocą funkcji łączącej (kopuły). Dodatkowo, opracowano model czasu konserwacji systemu poprzez syntezę funkcji intensywności uszkodzeń każdej jednostki systemu. Ponadto, określono średni czas konserwacji dla minimalnej liczby uszkodzeń. Metoda ta pokazuje, że minimalny średni czas konserwacji proponowanego systemu jest korzystniejszy niż tradycyjnie przyjęty i stanowi podstawę do projektowania niezawodności systemu i jego składowych.
    Źródło:
    Eksploatacja i Niezawodność; 2017, 19, 4; 604-614
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An innovative methodology for recycling iron from magnetic preconcentrate of an iron ore tailing
    Autorzy:
    Yu, J.
    Han, Y.
    Gao, P.
    Li, Y.
    Yuan, S.
    Li, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/110888.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    magnetic preconcentrate
    iron ore tailing
    iron recycling
    fluidized magnetization roasting
    magnetic separation
    Opis:
    Iron ore tailing is a kind of hazardous solid waste produced by iron and steel industry. In order to separate and recycle iron from the magnetic preconcentrate of an iron ore tailing, an innovative technological route of fluidized magnetization roasting followed by low-intensity magnetic separation was proposed in this paper. The effects of roasting temperature, dosages of reducing gas CO and fluidizing gas N2 on recovery rate of iron were carried out and optimized. The results showed that the hematite was almost reduced to magnetite by a gas mixture of 4 m3/h CO and 1 m3/h N2 at roasting temperature of 540 °C. Under the optimized conditions, a magnetic concentrate assaying 61.4 wt% Fe with a recovery rate of 81.8% was obtained from the magnetic preconcentrate of an iron ore tailing. The iron chemical phase, X-ray diffraction (XRD), and optical metallographic microscope analyses revealed that siderite was converted to magnetite successfully after roasting, and some coarse magnetite-hematite interlocking particles were formed due to insufficient reaction time, which could also be recovered by magnetic separation after liberating from gangue minerals.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 668-676
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An improved resonant thermal converter based on micro-bridge resonator
    Autorzy:
    Dong, L.
    Han, J.
    Zhang, P.
    Zhao, Z.
    Cheng, B.
    Han, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/220878.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric transfer difference
    micro-bridge resonator
    thermal converter
    bifilar heater
    Opis:
    This paper presents the design, fabrication and testing of an improved thin-film thermal converter based on an electro-thermally excited and piezo-resistively detected micro-bridge resonator. The resonant thermal converter comprises a bifilar heater and an opposing micro-bridge resonator. When the micro-bridge resonator absorbs the radiant heat from the heater, its axial strain changes, then its resonant frequency follows. Therefore the alternating voltage or current can be transferred to the equivalent DC quantity. A non-contact temperature sensing mechanism eliminates heat loss from thermopiles and reduces coupling capacitance between the temperature sensor and the heater compared with traditional thin-film thermal converters based on thermopiles. In addition, the quasi-digital output of the resonant thin-film thermal converter eliminates such problems as intensity fluctuations associated with analogue signals output by traditional thin-film thermal converters. Using the fast-reversed DC (FRDC) method, the thermoelectric transfer difference, which determines the frequency-independent part of the ac-dc transfer difference, is evaluated to be as low as 1.1 · 10-6. It indicates that the non-contact temperature sensing mechanism is a feasible method to develop a high-performance thermal converter.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 4; 715-725
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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