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- 저자 : Zongping Zhang (검색결과 3 건)
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Investigation on compression properties of seawater-sea sand concrete
Chen, Zongping,Mo, Linlin,Song, Chunmei,Zhang, Yaqi Techno-Press 2021 Advances in concrete construction Vol.12 No.2
This paper introduces the experimental results of the influence of sea sand replacement rate and mixing water on the basic mechanical properties of sea sand concrete. A total of thirty test blocks were designed for uniaxial compression test. In this test two parameters were considered: (a) sea sand replacement ratio (i.e., 0%, 25%, 50%,75%, 100%); (b) water for mixing (i.e., freshwater, seawater). The entire stress-strain curve of sea sand concrete under uniaxial compression was obtained. Based on the test results, the influence of sea sand replacement rate and mixing water on the peak stress, peak strain, and deformation performance of sea sand concrete were analyzed. Test results showed that the stress-strain curves of seawater sea sand concrete were steeper than that of ordinary concrete, which indicated that seawater sea sand concrete was slightly more brittle. On the whole, the sea sand replacement rate had no significant effect on the axial compressive properties of sea sand concrete. Under the same sea sand replacement rate, the deformation performance of freshwater sea sand concrete (FSC) was slightly greater than that of seawater sea sand concrete (SSC). Seawater had an enhanced effect on the early strength development of sea sand concrete.
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Xiaoping Li,Zongping Zhang,Jiangnan Huang,Lijie Su,Mengjin Zhu,Mei Yu 한국유전학회 2013 Genes & Genomics Vol.35 No.3
In pigs, complex molecular cross-talk between the mother and embryo(s) especially maternal immunotolerance at the maternal-fetal interface has been postulated to play important roles on embryo/fetal loss during the peri-implantation and midgestation. In this study, we collected the endometrium samples in implantation sites at gestational day 15 (gd15), 26 (gd26)) and 50 (gd50)from Meishan pigs to evaluate the contribution of the genes participating in immune response by using porcine Affymetrix GeneChip.The results showed that totally 68immune related genes showed significantly differential expression at three stages, and the expression of these genes underwent drastic changes during the peri-implantation period (between gd15 and gd26). The identified genes including IL6 proinflammatory cytokine family,inflammatory chemokines (CCL28), IGF/IGFBP system,growth factors (FGF7) and adhesion molecules (ITGB3,PCDH15) may prove valuable for further investigations of porcine prenatal mortality.
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Sun, Hainan,Xu, Xiaomin,Hu, Zhiwei,Tjeng, Liu Hao,Zhao, Jie,Zhang, Qin,Lin, Hong-Ji,Chen, Chien-Te,Chan, Ting-Shan,Zhou, Wei,Shao, Zongping The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.16
<P>If different active sites in a catalyst have optimal binding to different reaction intermediates and short reaction paths among them, they may work cooperatively to enhance the oxygen evolution reaction (OER) activity. Based on this design principle, in this study, we start with a B-site ordered double perovskite Sr2FeMoO6−δ with poor OER activity as the host material to fulfill the requirement of a short pathway, and then, replace Mo with Ni and Fe with Co to optimize the synergistic interplay of the multi-active sites. Replacing Mo with Ni indeed dramatically enhances the OER activity and structural/operating stability. Further improvement in OER performance is realized by partial substitution of Fe with Co, leading to the development of a material with the nominal composition of Sr2Fe0.8Co0.2Mo0.65Ni0.35O6−δ, which outperforms the noble metal oxide IrO2 and is better than most of the electrocatalysts developed based on a single descriptor, such as Ba0.5Sr0.5Co0.8Fe0.2O3−δ (eg occupancy close to unity), PrBaCo2O5+δ (O 2p-band center relative to the Fermi level), and La0.5Sr0.5CoO3−δ (charge-transfer energy) in many aspects. As a universal method, combined structural and compositional tuning to create a cooperative effect among different active sites for intermediate adsorption and reaction in an ordered structure may provide a new way for the design of superior electrocatalysts for various applications.</P>
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