| 1. |
- Hu, Bisong, et al.
(author)
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Geographical detector-based assessment of multi-level explanatory powers of determinants on China’s medical-service resumption during the COVID-19 epidemic
- 2023
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In: Environment and planning B. - : SAGE. - 2399-8083 .- 2399-8091. ; 50:7, s. 1739-1758
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Journal article (peer-reviewed)abstract
- Knowing the multi-level influences of determinants on medical-service resumptions is of great benefits to the policymaking for medical-service recovery at different levels of study units during the post-COVID-19 pandemic era. This article evaluated the hospital- and city-level resumptions of medical services in mainland China based on the data of location-based service (LBS) requests of mobile devices during the two time periods (December 2019 and from February 21 to March 18, 2020). We selected medical-service capacity, human movement, epidemic severity, and socioeconomic factors as the potential determinants on medical-service resumptions and then explicitly assessed their multi-level explanatory powers and the interactive effects of paired determinants using the geographical detector method. The results indicate that various determinants had different individual explanatory powers and interactive relationships/effects at different levels of medical-service resumptions. The current study provides a novel multi-level insight for assessing work resumption and individual/interactive influences of determinants, and considerable implications for regionalized recovery strategies of medical services.
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| 2. |
- Lv, Yezhe, et al.
(author)
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Effect of tungsten on microstructure and properties of high chromium cast iron
- 2012
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In: Materials & design. - : Elsevier. - 0264-1275 .- 1873-4197 .- 0261-3069. ; 39, s. 303-308
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Journal article (peer-reviewed)abstract
- In this study, effect of tungsten on microstructure and properties of high chromium cast iron was investigated.The experimental results indicated that tungsten distributed uniformly in the matrix and carbides.W carbides are composed of WC1x, W6C2.54 and CW3 and W2C. With the increase of tungstencontent, bulk hardness and matrix microhardness both increased gradually and reached the peak at62.62HRC and 913HV, respectively. All of the tungsten-containing alloys performed better than tungsten-freealloys in impact tests and alloys containing 1.03 wt% W showed the highest impact toughness at8.23 J cm2. Tungsten considerably improved the performance of high chromium cast iron on wearresistance and alloys containing 1.03 wt%Wincreased 205% compared to tungsten-free alloys. Therefore,tungsten can be used as an alloying element to increase the hardness and wear resistance without scarifyingimpact toughness in high chromium cast iron. Alloys containing 1.03 wt% tungsten showed theoptimum properties.
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| 3. |
- Sun, Yufu, et al.
(author)
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Effects of nickel on low-temperature impact toughness and corrosion resistanceof high-ductility ductile iron
- 2012
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In: Materials & design. - : Elsevier. - 0264-1275 .- 1873-4197 .- 0261-3069. ; 41, s. 37-42
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Journal article (peer-reviewed)abstract
- High-ductility ductile iron was alloyed with 0–1.8 wt% Ni in this paper. The low-temperature impact toughness test and corrosion test of simulated seawater static whole-soaking were conducted to research the effect of nickel on the low-temperature impact toughness and corrosion resistance of high-ductility ductile iron. The results show that with nickel increasing, the impact toughness under low temperature ascents a great deal, and reaches the highest point with 0.71 wt% nickel addition, then descents; while the corrosion resistance has always been growing with the increasing of nickel content. Ductile iron containing 0.71 wt% nickel shows the best low-temperature impact toughness (the impact toughness values Akv of the samples reached 16.6 J at 20 C, 12.8 J at 40 C respectively) and exhibits the optimum combination properties. The presence of rust layer, which was made up of Fe3O4, played certain barrier for electrochemical reaction.
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