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    Wyświetlanie 1-22 z 22
    Tytuł:
    Development of Hydrophobic Surgical Forceps using Powder Injection Molding and Surface Treatment
    Autorzy:
    Park, D. Y.
    Park, B. R.
    Gal, C. W.
    Lin, D.
    Han, J. S.
    Jeong, M.-S.
    Bollina, R.
    Hwang, W.
    Park, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/352093.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder injection molding
    hydrophobic
    debinding
    sintering
    surface treatment
    Opis:
    Hydrophobic surgical forceps of end-effectors for laparoscopic operations or minimally invasive surgery were developed through powder injection molding (PIM) and surface treatment. Processing conditions for mixing, debinding, and sintering were investigated to produce defect-free components. An optimum solid loading was determined by torque rheometry experiments. The optimized processing conditions for debinding and sintering were designed through the measurement of weight loss and shrinkage behavior by thermogravimetric analysis and dilatometry experiments. After producing the surgical forceps based on the optimized processing conditions via PIM, surface treatment was carried out to generate the hydrophobic structure on the surface.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 473-480
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time and Temperature Dependent Damage Characteristics of 5083 Al Alloy under Cavitation-Corrosion Condition
    Autorzy:
    Lee, S.
    Han, M.
    Jeong, J.
    Kim, M.
    Kim, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398766.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.55.dp
    82.45.Bb
    Opis:
    Continuous efforts to construct high-speed and lightweight ship have been made to reduce cost against growing oil prices. In this context, aluminum has received attention as an alternative material for steel, for small and medium-sized ships. In an effort to extend service life of aluminum, various researches have been attempting to improve the corrosion resistance and anti-corrosion characteristics by applying heat treatment and alloying. The material, however, has a high probability of being attacked by corrosion and erosion, caused by high ship speed in severe marine environments. Cavitation damage is dependent on several important factors, such as shape of objects, surface roughness, rotation speed, fluid pressure and velocity. Vapor pressure, density and surface tension of fluid are also taken into account. In this study, an electrochemical cavitation erosion-corrosion experiment was conducted as a function of solution temperature and applied amplitude for 5083-O aluminum alloy used commercially as a hull material for a small sized ship. The result of the experiment revealed that the damage was accelerated due to synergistic effect of corrosion and erosion as the solution temperature was elevated, and that the weight loss showed a steady increase with increasing time of cavitation.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 747-752
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    A Systematic Procedure for Modeling Usability Based on Product Design Variables: A Case Study in Audiovisual Consumer Electronic Products
    Autorzy:
    Kim, K.-J.
    Han, S. H.
    Yun, M. H.
    Kwahk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/90811.pdf
    Data publikacji:
    2002
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    usability evaluation
    human interface elements
    consumer electronic products
    produkty przemysłowe
    ocena zgodności wyrobów
    ocena użyteczności
    produkty elektroniczne
    Opis:
    A systematic modeling approach to describing, prescribing, and predicting usability of a product has been presented. Given the evaluation results of the usability dimension (UD) and the measurement of the product’s design variables, referred to as the human interface elements (HIEs), the approach enables one to systematically assess the relationship between the UD and HIEs. The assessed relationship is called a usability model. Once built, such a usability model can relate, in a quantitative manner, the HIEs directly to the UDs, and thus can serve as an effective aid to designers by evaluating and predicting the usability of an existing or hypothetical product. A usability model for elegance of audiovisual consumer electronic products has been demonstrated.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2002, 8, 3; 387-406
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Development of Ship Watch Keeping Supporting Aids
    Autorzy:
    Im, N.
    Kim, E. K.
    Han, S. H.
    Jeong, J. S.
    Lee, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/117602.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Ship Watchkeeping
    Deck Officers
    Navigation Visual Supporting System
    Intelligent Technology
    Dangerous Floating Objects
    Binocular Telescope
    laser distance measuring unit
    Sea Trial Test
    Opis:
    This study deals with the development of ship watch keeping supporting aids that will be useful for ship deck officers in recognizing navigational harmful obstacles such as sea marks and small floating objects on the sea. The developed watch keeping supporting aids is made up of four components; a composite video sensor to produce video signal, a laser distance measuring part, a Pan/Tilt part and a central control part. The system was installed in a ship in order to verify its performance of the recognition ability on the sea. The comparison was made between the recognition ability of the system and that of watch keeping deck officers’. The image from the watch keeping supporting system was found to be more recognizable than that of a binocular telescope within a 5 km distance. The newly suggested system is expected to be used to recognize small dangerous floating objects more easily when navigation deck officers have a duty of watch keeping for navigation especially near harbor area.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 501-506
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology Change Of Si Deposit In Molten Salt Electrorefining
    Zmiana morfologii osadu Si podczas elektrorafinacji w stopionych solach
    Autorzy:
    Ryu, H. Y.
    Kwon, S. C.
    Han, M. H.
    An, Y. S.
    Lee, J. S.
    Lee, J. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/354346.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    molten salt
    silicon
    morphology
    electrorefining
    current density
    sól stopiona
    krzem
    morfologia
    elektrorafinacja
    gęstość prądu
    Opis:
    The effects of processing parameters on the morphology change in a Si deposit recovered by means of molten salt electrorefining are evaluated using electrochemical techniques such as cyclic voltammetry and chronopotentiometry at 800°C. It was found that concentration of K2SiF6 and current density were important parameters in determining deposit size. Higher concentrations of K2SiF6 were effective in coarsening the silicon deposit and decreasing the cell potential. Silicon nanofiber was recovered at 5 wt% of K2SiF6 whereas dense particles were prepared at 30 and 50 wt% of K2SiF6. The morphology of the Si deposit was determined by the concentration of Si in the electrolyte which is related to the formation of crystal and growth of Si. The formation mechanism of the Si deposit was interpreted by using high resolution TEM as well as electrochemical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1491-1497
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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:
    Prediction of the height of overburden fractured zone in deep coal mining: case study
    Prognozowanie wysokości strefy spękań w warstwach nadkładu w podziemnych kopalniach węgla: studium przypadku
    Autorzy:
    Han, Y.
    Cheng, J.
    Huang, Q.
    Zou, D. H. S.
    Zhou, J.
    Huang, S.
    Long, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/218745.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wysokość strefy spękań w warstwie nadkładu
    symulacje numeryczne
    układ ortogonalny
    pomiary in-situ
    the hei ght of overburden fractured zone
    numerical simulation
    orthogonal design
    in-situ test
    Opis:
    In the process of coal extraction, a fractured zone is developed in the overburden above the goaf. If the fractured zone is connected with an aquifer, then water inrush may occur. Hence, research and analysis of the height of overburden fractured zone (HOFZ) are of considerable significance. This study focuses on the HOFZ determination in deep coal mining. First, general deformation failure characteristics of overburden were discussed. Second, a new method, numerical simulation by orthogonal design(NSOD), have been proposed to determinate the HOFZ in deep coal mining. Third, the validity of NSOD is verified in the practical application, compared with empiric al formula in Chinese Regulations and in-situ test. These three methods were applied to determine the HOFZ of working face No. 111303 in No. 5 coal mine. The pre dicted HOFZ of NSOD is found to be similar to the result of the in-situ test (8.9% relative error), whereas the HOFZ calculated by the empirical formula has extremely large error (25.7% relative error). Results show that the NSOD can reliably predict the HOFZ in deep coal mining and reduce time and expenses required for in-situ test.
    W trakcie prowadzenia wydobycia węgla w warstwie skalnej leżącej ponad zrobami powstaje strefa spękań. Jeśli nieciągłości te związane są z formacjami wodonośnymi, może nastąpić nagły wypływ wód do kopalni. Stąd też waga problemu i konieczność badania wysokości strefy spękań w warstwach nadkładu zalegających nad wyrobiskiem. W pracy tej główny nacisk położono na określenie wysokości strefy spękań warstwy nadkładu zalegającej ponad wyrobiskiem w kopalni podziemnej. W pierwszej części pracy przedstawiono główne charakterystyki powstawania deformacji i pęknięć w warstwach nadkładu. Następnie zaproponowano nową metodę symulacji numerycznych w układzie ortogonalnym i jej wykorzystanie do określania wysokości strefy spękań w warstwach nadkładu w kopalni podziemnej. Następnie powyższą metodę zweryfikowano w praktycznym zastosowaniu, jako poziomy odniesienia wykorzystano odpowiednie wzory empiryczne określone w przepisach obowiązujących w Chinach oraz wyniki pomiarów in-situ. Powyższe trzy metody zastosowane zostały do określenia wysokości strefy spękań w warstwach nadkładu przy prowadzeniu ściany 111303 w kopalni węgla nr 5. Wyniki obliczeń wysokości strefy spękań uzyskane w oparciu o zaproponowaną nową metodę w dużym stopniu pokrywały się z wynikami pomiarów in-situ (błąd względny 8.9%); podczas gdy obliczenia wysokości strefy spękań w oparciu o odpowiednie wzory empiryczne obarczone były dużym błędem (błąd względny 25.7%). Uzyskane wyniki wskazują wiarygodność obliczeń w oparciu o zaproponowaną metodę, co pozwoli na ograniczenie czasu i kosztów związanych z wykonywaniem pomiarów in-situ.
    Źródło:
    Archives of Mining Sciences; 2018, 63, 3; 617-631
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Traditional Chinese herb, Astragalus: possible for treatment and prevention of COVID-19?
    Autorzy:
    Law, S.
    Lo, C.
    Han, J.
    Leung, A.W.
    Xu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049190.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    Astragalus
    herb
    Chinese herb
    treatment
    blood circulation
    prevention
    COVID-19
    antiinflammatory activity
    traganek
    tradycyjna chińska roślina lecznicza
    leczenie
    zapobieganie
    Opis:
    Astragalus is a traditional herb which has been used in China for a long time. It regulates blood circulation (vital energy), invigorates body fluid circulation, protects the flow of blood to fight against the attack of pathogens, and strengthens “blood deficiencies” according to Bencao Congxin. Astragalus was approved by the Food and Drug Administration in 2009 as a dietary supplement for upper respiratory infections, allergic rhinitis (hay fever), asthma, chronic fatigue syndrome, and chronic kidney disease. Thirty journals published in the past ten years were reviewed by using library search engines such as SCI/SCIE, PubMed, and Scopus. In this mini-review, we focus on the anti-inflammatory of Astragalus features, discuss the background of Astragalus and its function in various diseases from water-extracted Astragalus membranaceus, Astragalus saponins, and Astragalus polysaccharides. Based on the traditional Chinese medicine theory, Astragalus is a potential candidate to treat and prevent COVID-19.
    Źródło:
    Herba Polonica; 2020, 66, 4; 79-84
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flexible Software Design for Korean WA-DGNSS Reference Station
    Autorzy:
    Choi, W.S.
    Chhattan, S.S.
    Kye, J.E.
    Han, W.Y.
    Yun, H.
    Kee, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116770.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    Flexible Software Design
    Wide area Reference Station (WRS)
    Opis:
    In this paper, we describe the software design results of WA‐DGNSS reference station that will be constructed in Korea in the near future. Software design of the WRS (Wide area Reference Station) is carried out by applying object oriented software methodology in order to provide flexibilities: easy of model change (namely ionospheric delay model etc) and system addition (Galileo, GLONASS in addition to GPS etc). Software design results include the use case diagrams for the functions to be executed, the architecture diagram showing components and their relationships, the activity diagrams of behaviors and models among them, and class diagrams describing the attribute and operation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 75-78
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    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:
    LMPP Effects on Morphology, Crystallization, Thermal and Mechanical Properties of iPP/LMPP Blend Fibres
    Wpływ polipropylenu o małej masie cząsteczkowej (LMPP) na morfologię, krystalizację, właściwości termiczne i mechaniczne włókien mieszanych iPP/LMPP.
    Autorzy:
    Hussain, M.
    Zhu, F.
    Yu, B.
    Han, J.
    Memon, H.
    Yasin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/232887.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    polypropylene
    iPP/LMPP blends
    morphology
    crystallinity
    low molecular low modulus polypropylene
    polipropylen
    mieszanki iPP-LMPP
    morfologia
    krystaliczność
    niski poziom cząsteczkowy
    polipropylen o niskim module sprężystości
    Opis:
    The thermal properties and morphological characterisation of isotactic polypropylene (iPP) homopolymer and its blends with low molecular low modulus polypropylene (LMPP) were studied. Firstly blends were prepared with variant LMPP contents, and their properties were characterised using SEM, DSC, XRD, and DMA. Later the mechanical properties of iPP/LMPP blend fibres were investigated. SEM results showed that the iPP/LMPP blends produced smoother surfaces when the LMPP content was increased, as well as the miscibility. All the Tg values with different LMPP percentages were in-between pure iPP and LMPP. The XRD results indicated the LMPP percentage decreased along with the degree of crystallinity of the iPP/LMPP blends (5% to 15%), which increased and then decreased as compared to pure iPP. The elongation at break increased when the LMPP content increased, with the maximum elongation at break of the LMPP 25% blend reaching 12.95%, which showed great stretch-ability, whereas the elastic modulus of iPP/LMPP blends decreased.
    W pracy badano właściwości termiczne i morfologię homopolimeru izotaktycznego polipropylenu (iPP) i jego mieszanek z polipropylenem o małej masie cząsteczkowej (LMPP). Zastosowano następujące proporcje mieszania iPP/LMPP (wt/wt): 95/5, 90/10, 85/15, 80/20 i 75/25, zdefiniowano je odpowiedni: 5%, 10%, 15 %, 20% i 25%. Właściwości włokien mieszanych iPP/LMPP porównano do właściwości czystego PP i LMPP. Włókna mieszane zbadano za pomocą SEM, DSC, XRD i DMA. Następnie zbadano mechaniczne właściwości włókien iPP/LMPP. Wyniki SEM wykazały, że wraz ze zwiększeniem zawartości LMPP powierzchnia włókien charakteryzowała się większą gładkością. Wszystkie wartości Tg włókien mieszanych były pośrednie pomiędzy czystym iPP i LMPP. Stwierdzono, że wydłużenie przy zerwaniu zwiększyło się wraz ze wzrostem zawartości LMPP, przy maksymalnym wydłużeniu przy zerwaniu 12,95%, dla włókien z zawartością 25% LMPP, co wskazywało na dużą rozciągliwość, podczas gdy moduł sprężystości wzdłużnej włókien iPP / LMPP zmniejszył się.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 2 (128); 26-31
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wzrost i właściwości optyczne kryształu BaGd2 (MoO4)4 domieszkowanego Er3+
    Growth and optical properties of Er3+-doped BaGdcrystal 2 (MoO4)4
    Autorzy:
    Han, S.
    Wang, J.
    Zhang, H.
    Pan, S.
    Xv, H.
    Wang, Y.
    Shen, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/142191.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    Wytwarzanie kryształów
    ciepło właściwe
    widmo
    czas trwania fluorescencji
    crystal growth
    specific heat
    spectrum
    fluorescence lifetime
    Opis:
    Pojedynczy kryształ BaGd2(MoO4)4 domieszkowany 1% at. Er3+ wyhodowano metodą Czochralskiego. Omówiono szczegóły procedury otrzymywania i wzrostu kryształu. Kryształ ma doskonałą płaszczyznę poślizgu (010), a jego łupliwość czyni go przydatnym jako ośrodek czynny w mikrolaserach. Zmierzono widmo absorpcyjne w zakresie światła widzialnego i bliskiej podczerwieni (NIR) w temperaturze pokojowej. W zakresie od 380 do 1600 nm występuje kilka intensywnych pików absorpcyjnych. Zmierzono również widmo fluorescencyjne wzbudzane za pomocą lampy ksenonowej. Zaobserwowano intensywny pik emisyjny NIR 1536 nm. Czasy trwania fluorescencji 4I13/2 oraz 4I11/2 wyznaczone za pomocą dopasowania krzywej wykładniczej wyniosły odpowiednio 5,85 ms i 112,62 μs. Ciepło właściw Er3+ BaGd2(MoO4)4 w 25°C wynosi 0,471 J g-1 K-1. Na podstawie zmierzonych widm obliczono parametry optyczne na podstawie teorii Judda-Ofelta (J–O).
    A 1 at % Er3+ doped BaGd2(MoO4)4 single crystal was grown by the Czochralski method. Details on the preparation and growth procedures were discussed. The crystal has a perfect (010) cleavage plane, and the cleavage character makes the crystal suitable as a gain medium for microchip lasers. The absorption spectrum in the visible and near-infrared (NIR) regions was measured at room temperature. There are several strong absorption peaks in the range from 380 to 1600 nm. The fluorescence spectrum excited by a Xenon lamp was also measured. A strong NIR emission peak located at 1536 nm was observed. The fluorescence lifetimes of 4I13/2 and 4I11/23+:BaGd2(MoO4)4 at 25°C is 0.471 J g-1 K-1. Using the measured spectra, the optical parameters were calculated using the J–O theory.
    Źródło:
    Chemik; 2013, 67, 9; 763-770
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxide Formation In Metal Injection Molding Of 316L Stainless Steel
    Tworzenie tlenków podczas wtryskiwania proszku stali nierdzewnej 316L
    Autorzy:
    Jang, J. M.
    Lee, W.
    Ko, S.-H.
    Han, C.
    Choi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/351352.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder injection molding
    sintering
    316L stainless steel
    sintering atmosphere
    micro parts
    wtryskiwanie proszku
    spiekanie
    stal nierdzewna 316L
    mikro-część
    Opis:
    The effects of sintering condition and powder size on the microstructure of MIMed parts were investigated using water-atomized 316L stainless steel powder. The 316L stainless steel feedstock was injected into micro mold with micro features of various shapes and dimensions. The green parts were debound and pre-sintered at 800°C in hydrogen atmosphere and then sintered at 1300°C and 1350°C in argon atmosphere of 5torr and 760torr, respectively. The oxide particles were formed and distributed homogeneously inside the sample except for the outermost region regardless of sintering condition and powder size. The width of layer without oxide particles are increased with decrease of sintering atmosphere pressure and powder size. The fine oxides act as the obstacle on grain growth and the high sintering temperature causes severe grain growth in micro features due to larger amount of heat gain than that in macro ones.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1281-1285
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption behavior of Zn(II) onto natural minerals in wastewater. A comparative study of bentonite and kaolinite
    Autorzy:
    Chai, W.
    Huang, Y.
    Su, S.
    Han, G.
    Liu, J.
    Cao, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/109926.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption
    Zn(II)
    wastewater
    clay minerals
    structural properties
    Opis:
    In order to remove the harmful metal ions in lead-zinc mineral processing wastewater, two natural clay minerals (bentonite and kaolin) were used as adsorbents and Zn(II) ions were the emphasis in this work. The adsorption behaviors including kinetics and isotherms were investigated by batch experiments. In addition, the adsorption mechanisms were studied by means of zeta potential testing, optical microscope and XRD analysis. The results show that the adsorption process can be best described as the pseudo-second order kinetic model. The adsorption equilibrium data of bentonite and kaolinite can be respectively fitted best by Langmuir and Freundlich models. Thermodynamic studies display that the adsorption of Zn(II) onto clays is non-spontaneous and endothermic. The maximum capacity of Zn(II) adsorbed on bentonite and kaolinite respectively reaches to 79.2 mg·g-1 and 6.35 mg·g-1 at 25 °C. The structural differences of bentonite and kaolinite result in the differences in adsorption behavior and mechanism. The interaction mechanisms of Zn(II) with bentonite and kaolinite involve electrostatic attraction, cation exchange, surface complex and precipitation. Bentonite as adsorbent has the potential to remove Zn2+ better than kaolinite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 1; 264-278
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    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:
    Fabrication of Antireflection Structures as a Protective Layer of Solar Cells with Nanoporous Silica Films and Nanoimprinted Moth-Eye Structure
    Autorzy:
    Kim, K.
    Han, J.
    Jang, J.
    Choi, C.
    Choi, S.
    Kim, C.
    Kye, H.
    Cheong, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492625.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    68.37.-d
    68.55.-a
    78.20.-e
    Opis:
    The antireflection structures are fabricated by sol-gel process as a protective layer of solar cells and by hot embossing process with anodized aluminum oxide membrane template on polycarbonate film. The optical properties and morphology of the antireflection structures are analyzed by UV-visible spectroscopy and field emission scanning electron microscopy, respectively. The total conversion efficiency of a polycrystalline Si solar cell module with the protective layer, sol-gel-derived nanoporous antireflection structure, is increased by 2.6% and 5.7% for one-side antireflection coated prismatic matt glass and both-side antireflection coated prismatic matt glass, respectively.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-047-A-049
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved Mechanical Properties of Al-Si Alloys by Adding an Extrusion Process to Conventional Processing Method
    Autorzy:
    Han, J. Y.
    Femi, O. E.
    Kilicaslan, F.
    Jeong, C. U.
    Baeg, C. H.
    Hong, S. J.
    Koo, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355114.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si alloys
    extrusion
    mechanical properties
    Opis:
    In this study, the mechanical properties of Al-Si alloys was improved by selecting higher Si content and avoiding distortion in Al-Si matrix by adding an extrusion process such that the fabrication processes casting and extrusion were in sequence. Cast billets were extruded at ratios 4:1 and 10:1 to obtained two extruded bars with different processing parameters. The as-extruded samples were characterized and investigated for microstructure and mechanical properties. Optical Microscope was used to examined phase morphologies and microstructures of the extruded Al-Si bars. Mechanical properties were conducted on each sample to study the effectiveness of the additional extrusion process in high Si content Al-Si alloys. The result shows that by increasing the extrusion ratio, the size of the primary Si particle reduces leading to a higher density, better tensile and yield strength compared to the cast billet.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1179-1183
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oligonol prevented the relapse of dextran sulfate sodium-ulcerative colitis through enhancing Nrf2-mediated antioxidative defense mechanism
    Autorzy:
    Kim, K.-J.
    Park, J.-M.
    Lee, J.-S.
    Kim, Y.S.
    Kangwan, N.
    Han, Y.-M.
    Kang, E.A.
    An, J.M.
    Park, Y.K.
    Hahm, K.-B.
    Powiązania:
    https://bibliotekanauki.pl/articles/69501.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    ulcerative colitis
    inflammatory bowel disease
    oxidative stress
    oligonol
    polyphenol
    adaptive response
    quinone oxidoreductase
    relapse
    nuclear factor-kappaB
    tumour necrosis factor-alpha
    Źródło:
    Journal of Physiology and Pharmacology; 2018, 69, 3
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    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
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