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    Wyświetlanie 1-6 z 6
    Tytuł:
    Properties of Pure Ti Implants Fabricated by Additive Manufacturing
    Autorzy:
    Kim, Dong-Jin
    Kim, Hyung-Giun
    Kim, Ji-Sun
    Song, Kuk-Hyun
    Powiązania:
    https://bibliotekanauki.pl/articles/354362.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pure Ti
    selected laser melting
    heat input
    microstructure
    mechanical property
    Opis:
    This study was carried out to evaluate the aspect of microstructure and mechanical property development on additive manufactured pure Ti at elevated heat-input. For this work, pure Ti powder (commercial purity, grade 1) was selected, and selective laser melting was conducted from 0.5 to 1.4 J/mm. As a result, increase in heat-input led to the significant grain growth form 4 μm to 12 μm, accompanying with the change of grain shape, correctly widmanstätten structured grains. In addition, Vickers microhardness was notably increased from 228 Hv to 358 Hv in accordance with elevated heat-input, which was attributed to the increased concentration of oxygen and nitrogen mainly occurred during selected laser melting process.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 959-962
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mismatch in working hours and workaholism in permanent waged workers
    Autorzy:
    Park, Shin-Goo
    Kim, Hyung-Doo
    Min, Jin-Young
    Min, Kyoug-Bok
    Hwang, Sang-Hee
    Jang, Eun-Chul
    Powiązania:
    https://bibliotekanauki.pl/articles/2116653.pdf
    Data publikacji:
    2020-03-13
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    workaholism
    working hours mismatch
    waged worker
    workaholic
    mismatched
    weekly working hours
    Opis:
    ObjectivesA cross-sectional study was conducted to investigate whether working hours mismatch is associated with workaholism.Material and MethodsThis study used the data from the 17th wave (2014) of the nationwide Korean Labor and Income Panel Study. Workaholism was evaluated using the Workaholism Analysis Questionnaire. The final study involved 3157 subjects who answered questions regarding both workaholism and working hours mismatch. To identify the association between working hours mismatch and workaholism according to weekly working hours, a stratification analysis was conducted by dividing the number of working hours/week into 3 groups (≤40 h, 41–59 h, and ≥60 h). The odds ratios were calculated using a multiple logistic regression model, which was adjusted for potential confounders.ResultsThe workers working more hours than desired showed the greatest frequency of workaholism. As regards workaholism, in all weekly working hours groups, the odds ratios of the group working more hours than desired were 4.28, 95% CI: 2.29–7.99 (≥40 h), 2.14, 95% CI: 1.34–3.43 (41–59 h), 3.40, 95% CI: 1.60–7.21 (≤60 h), which were statistically significant compared to the reference (matched) group. There was no statistically significant relationship between working hours and workaholism when stratified according to the mismatch in working hours.ConclusionsThe workers’ working hours mismatch can be significantly related to workaholism.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2020, 33, 2; 187-194
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamijeonssibaekchulsan regulates mast cell-mediated anaphylactic reaction
    Autorzy:
    Moon, Phil
    Shin, Hye
    Na, Ho
    Jeong, Hyun
    Kim, Su
    Um, Jae
    Park, Rae
    Kim, Hyung
    Hong, Seung
    Powiązania:
    https://bibliotekanauki.pl/articles/1041085.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    histamine
    passive cutaneous anaphylaxis
    gamijeonssibaekchulsan
    MOLT-4 cells
    Opis:
    Gamijeonssibaekchulsan (GJBS) is a typical Oriental medicine prescription which has been used in Korea for the treatment of allergic diseases and the development of physical strength. However, as yet there is no clear explanation of how GJBS affects the anaphylactic reaction and the immune function. In the present study murine models and MOLT-4 cells, a T cell line, were used to investigate these effects. Compound 48/80-induced systemic anaphylactic shock and ear swelling response were firstly analyzed. We also assayed histamine release and passive cutaneous anaphylaxis (PCA) in mice and cytokine productions in MOLT-4 cells. GJBS significantly inhibits compound 48/80-induced systemic anaphylactic shock and ear swelling response. GJBS also inhibits histamine release from rat peritoneal mast cells induced by compound 48/80. PCA activated by anti-dinitrophenyl immunoglobulin E is attenuated by GJBS. However, GJBS dose not affect the production of interferon-γ, interleukin (IL)-2, and IL-4 in MOLT-4 cells. These results indicate that GJBS has a potential regulatory effect on allergic reactions that are mediated by mast cells.
    Źródło:
    Acta Biochimica Polonica; 2007, 54, 2; 349-355
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Post-Heat Treatment on the Impact Toughness and Crack Propagation Mechanism of AISI D2 Tool Steel Manufactured by Direct Energy Deposition
    Autorzy:
    Park, Jun-Hyung
    Kim, Kyu-Sik
    Koo, Yong-Mo
    Kim, Jin-Young
    Kim, Min-Chul
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/2203722.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AISI D2 tool steel
    direct energy deposition
    post-heat treatment
    impact toughness
    fractography
    Opis:
    This study investigated the effect of heat treatment on the microstructure and impact toughness property of AISI D2 manufactured with direct energy deposition (DED) and compared the results with conventional wrought material. The fracture crack propagation behavior was examined in connection with microstructures through fracture surface analysis. AISI D2 manufactured with DED had a eutectic structure that turned into a net-type carbide after heat treatment, and Cr-rich needle-type secondary carbide was observed. Impact toughness of DED AISI D2 measured 2.0 J/cm2 in the as-built sample and 1.1 J/cm2 in the heat-treated sample. Compared to a wrought heat-treated AISI D2, DED AISI D2 had relatively low impact toughness. DED AISI D2 and wrought material had different crack propagation mechanisms. In DED AISI D2, the eutectic structure and net-type carbide boundary were identified as the major microstructural factor decreasing impact toughness.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 119--122
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiple assessment methods of prenatal exposure to radio frequency radiation from telecommunication in the Mothers and Children’s Environmental Health (MOCEH) study
    Autorzy:
    Choi, Kyung-Hwa
    Ha, Mina
    Burm, Eunae
    Ha, Eun-Hee
    Park, Hyesook
    Kim, Yangho
    Lee, Ae-Kyoung
    Kwon, Jong Hwa
    Choi, Hyung-Do
    Kim, Nam
    Powiązania:
    https://bibliotekanauki.pl/articles/2168386.pdf
    Data publikacji:
    2016-11-18
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    prenatal exposure
    validation
    mobile phone
    radio frequency radiation
    MOCEH
    personal exposure meter
    Opis:
    Objectives To evaluate prenatal exposure to radiofrequency radiation (RFR) from telecommunication using a mobile phone questionnaire, operator data logs of mobile phone use and a personal exposure meter (PEM). Material and Methods The study included 1228 mother–infants pairs from the Mothers and Children’s Environmental Health (MOCEH) study – a multicenter prospective cohort study ongoing since 2006, in which participants were enrolled at ≤ 20 weeks of pregnancy, with a follow-up of a child birth and growth to assess the association between prenatal environmental exposure and children’s health. The questionnaire included the average calling frequency per day and the average calling time per day. An EME Spy 100 PEM was used to measure RFR among 269 pregnant women from November 2007 to August 2010. The operators’ log data were obtained from 21 participants. The Spearman’s correlation test was performed to evaluate correlation coefficient and 95% confidence intervals between the mobile phone use information from the questionnaire, operators’ log data, and data recorded by the PEM. Results The operators’ log data and information from the self-reported questionnaire showed significantly high correlations in the average calling frequency per day (ρ = 0.6, p = 0.004) and average calling time per day (ρ = 0.5, p = 0.02). The correlation between information on the mobile phone use in the self-reported questionnaire and exposure index recorded by the PEM was poor. But correlation between the information of the operators’ log data and exposure index for transmission of mobile communication was significantly high: correlation coefficient (p-value) was 0.44 (0.07) for calling frequency per day, and it was 0.49 (0.04) for calling time per day. Conclusions The questionnaire information on the mobile phone use showed moderate to high quality. Using multiple methods for exposure assessment might be better than using only one method. Int J Occup Med Environ Health 2016;29(6):959–972
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2016, 29, 6; 959-972
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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