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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effects of Y2O3 on Microstructure and Corrosion Properties of Laser Cladding Composite Coatings on 304 Stainless Steel Substrate
    Autorzy:
    Yu, Jinling
    Zhentai, Zheng
    Li, Shuai
    Guo, Donghui
    Chang, Liang
    Powiązania:
    https://bibliotekanauki.pl/articles/27313865.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    laser cladding
    Ni-based coatings
    electrochemical corrosion
    Opis:
    Ni625/WC composite coatings added with different amounts of Y2O3 were prepared on the surface of 304 stainless steels by laser cladding. This study focused on the microstructure characteristics, microhardness, and corrosion performances of Ni625/WC composite coatings. The results showed that Y2O3 can effectively improve the corrosion resistance of the composite coatings. The microstructure from the bottom to the surface of composite coatings consists of plane crystal, cellular crystal, columnar crystal and equiaxed crystal. The Y2O3 content of optimum composite coating was 1.0%. Its microhardness was three times that of matrix material. In addition, the corrosion current density of the composite coating was only 2% of Ni625/WC coating, which was attributed to the good properties of Y2O3 and appropriate Y2O3 refined microstructure.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 447--453
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applying rapid heating for controlling thermal displacement of CNC lathe
    Autorzy:
    Than, Van-The
    Wang, Chi-Chang
    Ngo, Thi-Thao
    Guo, Guan-Liang
    Powiązania:
    https://bibliotekanauki.pl/articles/27309848.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    rapid heating
    CNC lathe
    thermal displacement
    ball screw
    temperature control
    szybkie nagrzewanie
    tokarka CNC
    przemieszczenie termiczne
    śruba kulowa
    kontrola temperatury
    Opis:
    Thermal error always exists in a machine tool and accounts for a large part of the total error in the machine. Thermal displacement in X-axis on a CNC lathe controlled based on a rapid heating system is presented in this paper. Positive Temperature Coefficient (PTC) heating plates are installed on the X-axis of the machine. A control temperature system is constructed for rapid heating which further helps the thermal displacement to quickly reach stability. The system then continuously maintains stable compensation of the thermal error. The presented rapid heating technique is simpler than the compensation of machine thermal errors by interference in the numerical control system. Results show that the steady state of the thermal displacement in the X-axis can be acquired in a shorter time. In addition, thermal errors in constant and varying working conditions could be significantly reduced above 80% and 60%, respectively, compared to those without using the rapid heating. Therefore, the proposed method has a high potential for application on the CNC lathe machine for improving its precision.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 3; 519--539
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effort-reward imbalance and job strain index associated with health-related quality of life for civil servants in a national survey: the mediation effect of job support and over-commitment
    Autorzy:
    Tseng, Po-Chang
    Lin, Ping-Yi
    Liang, Wen-Miin
    Lin, Wen-Yu
    Kuo, Hsien-Wen
    Powiązania:
    https://bibliotekanauki.pl/articles/2085738.pdf
    Data publikacji:
    2022-08-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    job strain
    civil servants
    mediation analysis
    health-related quality of life
    effort-reward imbalance
    job support
    Opis:
    ObjectivesWork-related stress (WRS) is significantly associated with health-related quality of life (HRQoL), but the amounts of evidence on differences of effort-reward imbalance (ERI) and job strain index (JSI) remain sparse and have limited generalizability. Therefore, we aimed to assess the association between ERI and JSI with HRQoL and assess the mediation effect of social support (JS) and over-commitment (OC) on this association in Taiwan’s civil servants.Material and MethodsA cross-sectional national survey was given to registered civil servants in Taiwan – 20 046 civil servants from 647 institutions were enrolled using multistage stratified random cluster sampling. A web-questionnaire collected demographic information, job characteristics, and different indexes of ERI and job-control-demand-support (JCDS) models. Structural equation model (SEM) was used to examine the association between ERI and JSI with HRQoL, and the mediation effect of JS and OC on the associations.ResultsIn the ERI model, ERI and OC were consistently negatively associated with the mental component score (MCS) (r = –0.46 and r = –0.37) and physical component score (PCS) (r = –0.45 and r = –0.34), which were higher than job demand (r = –0.28 and r = –0.22) and JSI (r = –0.38 and r = –0.29). Using hierarchical multiple regression analyses, ERI was significantly correlated with MCS and PCS, which was consistently higher than JSI. The ERI and JSI were significantly correlated with MCS (β = –0.170 and β = –0.140) and PCS (β = –0.150 and β = –0.082) using SEM analysis, whereas ERI was considerably higher than in JSI. In addition, OC and JS mediated the association between The ERI and JSI with HRQoL.ConclusionsWe found the ERI index is significantly correlated with HRQoL superior to JSI, in particular among Taiwan civil servants. Further longitudinal studies are needed to determine the causality and spatiotemporal relation of these differences.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2022, 35, 4; 425-436
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Microstructure and Strengthening Mechanisms of Ti-6Cu-8Nb-xCr3C2 Alloy through Vacuum Sintering Process
    Autorzy:
    Chang, Shih-Hsien
    Weng, Chen-Yu
    Huang, Kuo-Tsung
    Liang, Cheng
    Powiązania:
    https://bibliotekanauki.pl/articles/2106558.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vacuum sintering
    Ti-6Cu-8Nb-Cr3C2 alloy
    hardness
    transverse rupture strength
    EBSD
    Opis:
    This study mixes four different powders to produce Ti-6Cu-8Nb-xCr3C2 (x = 1, 3, and 5 mass%) alloys in three different proportions. The experimental results reveal that when 5 mass% Cr3C2 was added to the Ti-6Cu-8Nb alloys, the specimen possessed optimal mechanical properties after sintering at 1275°C for 1 h. The relative density reached 98.23%, hardness was enhanced to 67.8 HRA, and the transverse rupture strength (TRS) increased to 1821.2 MPa, respectively. The EBSD results show that the added Cr3C2 in situ decomposed into TiC and NbC during the sintering process, and the generated intermetallic compounds (Ti2Cu) were evenly dispersed in the Ti matrix. Furthermore, the reduced Cr atom acts as a β-phase stabilizing element and solid-solution in the Ti matrix. Consequently, the main strengthening mechanisms of the Ti-6Cu-8Nb-xCr3C2 alloys include dispersion strengthening, solid-solution strengthening, and precipitation hardening.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 815--825
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the Microstructure, Electrical and Mechanical Properties of Hot Pressing Cr-50 Mass% Ni Alloys Fabricated by Addition of Various Ratios of Nanosized Ni Powders
    Autorzy:
    Huang, Jhong-Ren
    Chang, Shih-Hsien
    Liao, Cheng-Liang
    Powiązania:
    https://bibliotekanauki.pl/articles/2125538.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical conductivity
    hot pressing
    transverse rupture strength
    nanosized nickel powders
    Cr-50 mass% Ni alloy
    Opis:
    In this work, nanosized Ni (nNi) powders of 50 nm are mixed with Cr and Ni submicron-powders (600 nm) to fabricate Cr-50 mass% Ni alloys by vacuum hot pressing. In order to evaluate the influence of the nanosized Ni powders, different amounts of nanosized Ni powders are added to produce the Cr-(50-x) mass% Ni-x mass% nNi alloys (x = 0, 10, 20, and 30). The hot pressing was maintained at 1275°C, 48 MPa for 1 h. The microstructure evaluation, mechanical, and electrical properties were performed. The results reveal that mechanical and electrical properties are enhanced when increasing the nNi addition. The Cr-20 mass% Ni-30 mass% nNi presents the highest relative density of 96.53% and the electrical conductivity of 2.18×104 Scm-1, moreover, the hardness and transverse rupture strength values increase to 76.1 HRA and 1217 MPa, respectively. Moreover, a more homogeneous microstructure and a decrease in the mean grain size to 3.15 μm are acquired. Significantly, this fabrication procedure (adding 30 mass% nanosized nickel powders) results in the optimal microstructure, electrical and mechanical properties of submicron-structured Cr-(50-x) mass% Ni-x mass% nNi alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 955--961
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cooperative adaptive driving for platooning autonomous self driving based on edge computing
    Autorzy:
    Chang, Ben-Jye
    Hwang, Ren-Hung
    Tsai, Yueh-Lin
    Yu, Bo-Han
    Liang, Ying-Hsin
    Powiązania:
    https://bibliotekanauki.pl/articles/330778.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    mobile edge computing
    active safe driving
    cooperative platoon driving
    cooperative adaptive cruise control
    przetwarzanie mobilne
    bezpieczna jazda
    tempomat adaptacyjny
    Opis:
    Cooperative adaptive cruise control (CACC) for human and autonomous self-driving aims to achieve active safe driving that avoids vehicle accidents or traffic jam by exchanging the road traffic information (e.g., traffic flow, traffic density, velocity variation, etc.) among neighbor vehicles. However, in CACC, the butterfly effect is encountered while exhibiting asynchronous brakes that easily lead to backward shock-waves and are difficult to remove. Several critical issues should be addressed in CACC, including (i) difficulties with adaptive steering of the inter-vehicle distances among neighbor vehicles and the vehicle speed, (ii) the butterfly effect, (iii) unstable vehicle traffic flow, etc. To address the above issues in CACC, this paper proposes the mobile edge computing-based vehicular cloud of the cooperative adaptive driving (CAD) approach to avoid shock-waves efficiently in platoon driving. Numerical results demonstrate that the CAD approach outperforms the compared techniques in the number of shock-waves, average vehicle velocity, average travel time and time to collision (TTC). Additionally, the adaptive platoon length is determined according to the traffic information gathered from the global and local clouds.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 2; 213-225
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of nitrogen addition on growth and photosynthetic characteristics of Acer truncatum seedlings
    Autorzy:
    Guo, X.
    Wang, R.
    Chang, R.
    Liang, X.
    Wang, C.
    Luo, Y.
    Yuan, Y.
    Guo, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/41162.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    nitrogen addition
    plant growth
    photosynthesis
    Acer truncatum
    tree
    plant morphology
    carbon assimilation
    chlorophyll fluorescence
    seedling
    Opis:
    Increasing levels of atmospheric nitrogen deposition have greatly affected forest trees. Acer truncatum Bunge has a large distribution in northern China, Korea and Japan and plays an important ecological role in forest ecosystems. We investigated the responses of A. truncatum to a broad range of nitrogen addition regimes with a focus on seedling growth, biomass partitioning, leaf morphology, gas exchange physiology and chlorophyll fluorescence physiology. Moderate nitrogen addition promoted shoot height, stem diameter at ground height, total biomass, size of leaves and chlorophyll fluorescence and gas exchange performance, whereas extreme level of nitrogen addition did not result in such facilitation. Chlorophyll content, pattern of biomass partitioning, ratio of leaf length to width, leaf water content, and specific leaf area did not change among the addition regimes. The critical amount of nitrogen deposition should be defined in the context of a certain time period in a particular region for a certain species at a special developmental stage. The critical amount of N deposition that weakens total biomass facilitation in A. truncatum planted in mixed soil of yellow cinnamon soil and humic soil is approximately 10 g N m−2 y−1 during the first growing season.
    Źródło:
    Dendrobiology; 2014, 72
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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