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    Wyświetlanie 1-9 z 9
    Tytuł:
    Effect Of Heat-Treatment On Microstructure And Magnetic Properties Of Nanocrystallized Mn-Zn Ferrite Powders
    Wpływ obróbki cieplnej na mikrostrukturę i właściwości magnetyczne nanokrystalicznych proszków ferrytu Mn-Zn
    Autorzy:
    Lee, W. H.
    Hong, C. S.
    Chang, S. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/351552.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high energy ball milling
    nanosized particles
    crystallite size
    magnetic properties
    frezowanie kulowe
    nanocząstki
    wielkości krystalitów
    właściwości magnetyczne
    Opis:
    The initial ferrite powders were subjected to high energy ball milling at 300rpm for 3h, and subsequently heat-treated at 573-1273K for 1h. Based on the observation of microstructure and measurement of magnetic properties, the heat-treatment effect was investigated. The size of initial powders was approximately 70μm. After milling, the powders with approximately 230nm in size were obtained, which were composed of the nano-sized particles of approximately 15nm in size. The milled powders became larger to approximately 550nm after heat-treatment at 973K. In addition, the size of particles increased to approximately 120nm with increasing temperature up to 973K. The coercivity of initial powders was almost unchanged after milling, whereas the saturation magnetization increased. As the heat-treatment temperature increased, the saturation magnetization gradually increased and the maximum coercivity was obtained at 773K.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1347-1350
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Trace Elements (Co, Cr) on the Microstructure and Physical Properties of Al-Si-Cu-Mg-Fe Extruded Alloy
    Autorzy:
    Ahn, S. S.
    Sharief, P.
    Lee, C. H.
    Son, H. T.
    Kim, Y. H.
    Kim, Y. C.
    Hong, S.
    Hong, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/352787.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si alloy
    microstructure
    extrusion
    coefficient of thermal expansion
    trace elements
    Opis:
    Trace elements Co, Cr were added to investigate their influence on the microstructure and physical properties of Al-Si extruded alloy. The Co, Cr elements were randomly distributed in the matrix, forms intermetallic phase and their existence wereconfirmed by XRD, EDS and SEM analysis. With addition of trace elements, the microstructure was modified, Si particle size was reduced and the growth rate of β-(Al5 FeSi) phase limited. Compared to parent alloy, hardness and tensile strength were enhanced while the linear coefficient of thermal expansion (CTE) was significantly reduced by 42.4% and 16.05% with Co and Cr addition respectively. It is considered that the low CTE occurs with addition of Co was due to the formation of intermetallic compound having low coefficient of thermal expansion. The results suggested that Co acts as an effective element in improving the mechanical properties of Al-Si alloy.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 857-862
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Acid Dissolution Conditions on Recovery of Valuable Metals from Used Plasma Display Panel Scrap
    Autorzy:
    Kim, C.- M.
    Dharmaiah, P.
    Kim, H.-S.
    Koo, J.-M.
    Yoon, J.-S.
    Hong, S.-H.
    Hong, S.-J.
    Powiązania:
    https://bibliotekanauki.pl/articles/355713.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high energy ball milling
    waste plasma display panels
    dissolution
    recovery
    Opis:
    The objective of this particular study was to recover valuable metals from waste plasma display panels using high energy ball milling with subsequent acid dissolution. Dissolution of milled (PDP) powder was studied in HCl, HNO3, and H2SO4 acidic solutions. The effects of dissolution acid, temperature, time, and PDP scrap powder to acid ratio on the leaching process were investigated and the most favorable conditions were found: (1) valuable metals (In, Ag, Mg) were recovered from PDP powder in a mixture of concentrated hydrochloric acid (HCl:H2O = 50:50); (2) the optimal dissolution temperature and time for the valuable metals were found to be 60°C and 30 min, respectively; (3) the ideal PDP scrap powder to acid solution ratio was found to be 1:10. The proposed method was applied to the recovery of magnesium, silver, and indium with satisfactory results.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1173-1177
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three Insensitive Energetic Co-crystals of 1-Nitronaphthalene, with 2,4,6-Trinitrotoluene (TNT), 2,4,6-Trinitrophenol (Picric Acid) and D-Mannitol Hexanitrate (MHN)
    Autorzy:
    Hong, D.
    Li, Y.
    Zhu, S.
    Zhang, L.
    Pang, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1063066.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    co-crystal
    insensitive energetic material
    crystal structure
    explosive properties
    Opis:
    Co-crystallization is proposed as an effective method to alter the physicochemical properties of energetic materials, e.g. density, sensitivity and solubility. As reported in this paper, it was found that 1-nitronaphthalene could form cocrystals with TNT, picric acid and MHN in a 1:1 molecular ratio. The sensitivity and thermal stability of the 1-nitronaphthalene co-crystals was greatly improved compared with that of pure TNT, picric acid and MHN. In addition, the melting points of TNT, picric acid and MHN were lowered through co-crystallization with 1-nitronaphthalene. The electrostatic potential surface of 1-nitronaphthalene, calculated by the DFT method, showed that the electron-rich 1-nitronaphthalene has a tendency to be a proton donor and to co-crystallize with other energetic materials. The structures of the co-crystals of 1-nitronaphthalene with TNT and picric acid were characterized by single crystal X-ray diffraction (SXRD). The 1-nitronaphthalene/MHN co-crystal was studied by powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC) and FTIR.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 1; 47-62
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Surfactant Addition on Bi2Te3 Nanostructures Synthesized by Hydrothermal Method
    Autorzy:
    Dharmaiah, P.
    Lee, C. H.
    Madavali, B.
    Hong, S.-J.
    Powiązania:
    https://bibliotekanauki.pl/articles/351609.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bismuth telluride
    hydrothermal synthesis
    spark plasma sintering
    thermoelectric materials
    X-ray diffraction
    Opis:
    In the present work, we have prepared Bi2Te3 nanostructures with different morphologies such as nano-spherical, nanoplates and nanoflakes obtained using various surfactant additions (EG, PVP, and EDTA) by a hydrothermal method. The shape of the nanoparticles can be controlled by addition of surfactants. The samples were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that the minority BiOCl phase disappears after maintained pH at 10 with EG as surfactant. SEM bulk microstructure reveals that the sample consists of fine and coarse grains. Temperature dependence of thermoelectric properties of the nanostructured bulk sample was investigated in the range of 300-450K. The presence of nanograins in the bulk sample exhibits a reduction of thermal conductivity and less effect on electrical conductivity. As a result, a figure of merit of the sintered bulk sample reached 0.2 at 400 K. A maximum micro Vickers hardness of 102 Hv was obtained for the nanostructured sample, which was higher than the other reported results.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1005-1010
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect Of Different Mechanical Milling Processes On Morphology And Microstructural Changes Of Nano And Micron Al-Powders
    Wpływ różnych procesów mielenia na morfologię i mikrostrukturę nanometrycznych i mikronowych proszków Al
    Autorzy:
    Kim, H.-S.
    Madavali, B.
    Eom, T.-J.
    Kim, C.- M.
    Koo, J.-M.
    Lee, T. H.
    Hong, S.-J.
    Powiązania:
    https://bibliotekanauki.pl/articles/355715.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al alloys
    high-energy ball milling
    low energy ball milling
    plastic deformation
    stopy Al
    wysokoenergetyczne mielenie kulkowe
    mielenie energooszczędne
    odkształcenia plastyczne
    Opis:
    In this research, effect of the various mechanical milling process on morphology and microstructural changes of nano and micron Al-powders was studied. The milling of Al-powders was performed by both high energy and low energy ball milling process. The influence of milling (pulverizing) energy on the structural changes of Al-powders was studied. Al-nanoparticles were agglomerated during the MA and its size was increased with increasing milling while micron Al-powder gets flattened shape during high energy ball milling due to severe plastic deformation. Meanwhile, structural evolution during high energy ball milling of the nano powder occurred faster than that of the micron powder. A slight shift in the position of X-ray diffraction peaks was observed in nano Al-powders but it was un-altered in macro Al-powders. The variation in lattice parameters was observed only for nano Al powders during the high energy ball milling due to lattice distortion.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1235-1239
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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:
    Ethnobotany of Acorus in China
    Autorzy:
    Shu, H.
    Zhang, S.
    Lei, Q.
    Zhou, J.
    Ji, Y.
    Luo, B.
    Hong, L.
    Li, F.
    Liu, B.
    Long, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/59160.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    In China, species in the genus Acorus are used for many different purposes, viz., in traditional medicine, for rituals, and as ornamental plants. Acorus calamus (sweet flag) has been a symbolic plant in Chinese culture for many centuries and is used as a ceremonial object in festivals throughout the country. For other Acorus species in China, ethnobotanical records are few. During field investigations from 2006 to 2017, we interviewed 573 individuals representing ethnic groups such as the Miao, Yao, Buyi, Shui, Tujia, Dong, She, Maonan, Zhuang, Yi, and Han people. Various ethnobotanical approaches were adopted in the field surveys, including key informant interviews, semistructured interviews, participatory observation, direct observation, etc. The results have revealed a rich treasure trove of traditional knowledge on Acorus in China. Two species (A. macrospadiceus and A. gramineus) were used by ethnic groups as spices to add flavor to meat. Through the study found that all the species of Acorus had medicinal value, especially A. tatarinowii, deafness, blindness, and digestive disorders were among the conditions commonly treated using these plants. Traditional knowledge of the cultural, ethnomedicinal, and food values of Acorus, based on our recent literature surveys and field investigations in China is presented here. A better understanding of Acorus is vital for conserving the plants and the traditional knowledge associated with them.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2018, 87, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hemifacial asymmetries in age perception: the left cheek looks older for females, but not males
    Autorzy:
    Lindell, Annukka K
    Cianchetta, Rhiannon O
    Azim, Sana M
    Freeman, Cody G
    de Oliveira, Nicole C
    Saban, Sakire
    Messina, Julia L
    Wilson, Kira Elise
    Egan, Alanna
    Caspar, Megan D
    Grey, Emma J
    McDonald, Bryce A
    Croxford, Kylie N
    Bui, Thu Trang
    Aiello, Ashley A
    Heywood-Smith, Victoria M
    Kidd, Andrew J
    Stanley, Shenae C
    Wakeling, Alarna
    Hoggan, Stephanie A.L
    Morriss, Ashleigh S
    Trinh, Thi Phuong Mai
    Thai-Nguyen, Hong
    Fonte, Melissa
    Agolli, Franceska
    Powiązania:
    https://bibliotekanauki.pl/articles/2106020.pdf
    Data publikacji:
    2019-12-18
    Wydawca:
    Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
    Tematy:
    emotion
    asymmetry
    hemisphere
    laterality
    age
    Opis:
    The left hemiface expresses emotion more intensely than the right. Because emotional expressions contract the facial muscles and wrinkle the skin, theoretically the left hemiface’s greater expressivity should prompt more pronounced expression lines and wrinkles on the left than right side of the face. As wrinkles are the most salient age cue, we investigated whether the left hemiface consequently appears older than the right. Two hundred and sixty participants (F=148; M=112) viewed booklets containing pairs of left-left and right-right chimeric faces of eight models (M=F). For each trial participants were asked to make a two alternative forced choice response indicating which image looked older. Results confirmed a left cheek bias, with participants more likely to select left-left than right-right chimeras. Whilst participant gender did not influence perceptions, model gender predicted cheek selections: responses to female models drive the overall left cheek bias. The left cheek (56.8%) appeared older than the right cheek (43.2%) for female models, whereas there was little difference in perceived age between male models' left (50.8%) and right (49.2%) cheeks. Given that youth influences perceptions of female beauty, these findings complement previous research and offer a potential explanation for why the left side of females’ faces are judged less attractive: the right cheek appears younger.
    Źródło:
    Acta Neuropsychologica; 2019, 17(4); 417-426
    1730-7503
    2084-4298
    Pojawia się w:
    Acta Neuropsychologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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