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The investigation of pH threshold value on the corrosion of steel reinforcement in concrete
Qi Pu,Yan Yao,Ling Wang,Xingxiang Shi,Jingjing Luo,Yifei Xie 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.3
The aim of this study is to investigate the pH threshold value for the corrosion of steel reinforcement in concrete. A method was designed to attain the pH value of the pore solution on the location of the steel in concrete. Then the pH values of the pore solution on the location of steel in concrete were changed by exposing the samples to the environment (CO25%, RH 40%) to accelerate carbonation with different periods. Based on this, the pH threshold value for the corrosion of steel reinforcement had been examined by the methods of half-cell potential and electrochemical impedance spectra (EIS). The results have indicated that the pH threshold value for the initial corrosion of steel reinforcement in concrete was 11.21. However, in the carbonated concrete, agreement among whether steel corrosion was initiatory determined by the detection methods mentioned above could be found.
Yifei Cai,Bin Qin,Chun Li,Xiaoqing Si,Jian Cao,Xiaohang Zheng,LIANG QIAO,Junlei Qi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Lithium (Li) metal is a promising material for high-energy–density batteries, but it is still plagued byobvious capacity degradation and low average Coulombic efficiency resulting from dendrite Li propagation. One main reason is the electro-mechanic coupled failure of plated Li on the current collector, whichcontributes to non-dense Li deposition on the anode. Transition metal oxides (TMOs) with a conversiontypemechanism have been used directly as the anode materials for lithium ion batteries, which demonstratedbetter electro-mechanical stability than metal Li. Herein, a successive ’’conversion-deposition’’mechanism is ingeniously developed to restrain the generation of dendritic Li. Specifically, a microcrystallineCu2O modified current collector was prepared, in which Li+ are sequentially inserted intoCu2O and deposited in the form of Li metal at successive low potential. A Li-Cu half-cell based on thehybrid mechanism sustains a high Coulombic efficiency of over 99.3 % in up to 800 cycles. This work ingeniouslyinhibits the generation of dendrite Li by incorporating conversion-type materials withdeposition-dissolution type metal Li, which contributes to a novel concept for the design of functionalcurrent collectors for composite Li anodes.
Grafting Effects on Root Activity and Amino Acid Contents in Bleeding Sap of Muskmelon
Tianlai Li,Yifei Liu,Hongyan Qi,Chunming Bai 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.3
The grafting effects on the yield and quality of muskmelon fruits were studied based on the measurements of root activity, acidity, electric conductivity and amino acids of bleeding sap. The results revealed that grafting enhanced significantly the activities of root systems and increased the volume and electric conductivity of bleeding sap in muskmelon during growth period. The fruit yield of grafted plants increased by 9.12%. The amino acids in bleeding sap of self-rooted and grafted muskmelon mainly consisted of threonine and glutamic acid. Grafting decreased significantly the contents of threonine, glutamic acid, cysteine, lysine and NH₃ in bleeding sap in the early and late growth stages, but increased the contents of aspartic acid, threonine, serine, glutamic acid, alanine, valine, isoleucine, leucine, tyrosine, phenylalanine, lysine, histidine and arginine in the middle growth stage. In the late growth stage, the contents of threonine, glutamic acid, cysteine, lysine and arginine in bleeding sap of grafted plants were reduced by 44.88%, 52.45%, 41.67%, 58.62% and 62.61%, respectively. The total amino acid content of self-rooted and grafted muskmelon plants showed the same trend of high-low-high in the whole growth period. In the early and late growth stages, the total amino acid content of self-rooted plants was significantly higher than that of the grafted plants. The increment of total amino acid in self-rooted muskmelon from middle to late growth stage was also greater than that in grafted muskmelon. It is suggested that the nutritional quality of grafted muskmelon fruits might be due to the changes of amino acid supply in bleeding sap.
Ziqian Li,Kaying Chan,Yifei Qi,Linlin Lu,Fen Ning,Mengling Wu,Haifang Wang,Yuan Wang,Shaohui Cai,Jun Du 대한암학회 2018 Cancer Research and Treatment Vol.50 No.3
Purpose Cancer-associated fibroblasts (CAFs) activated by cancer cells has a central role in development and malignant biological behavior in colorectal cancer (CRC). Adult fibroblasts do not express Snail, but Snail-positive fibroblasts are discovered in the stroma of malignant CRC and reported to be the key role to chemoresistance. However, the reciprocal effect of CAFs expressed Snail to chemoresistance on CRC cells and the underlying molecular mechanisms are not fully characterized. Materials and Methods Snail-overexpressed 3T3 stable cell lines were generated by lipidosome and CT26 mixed with 3T3-Snail subcutaneous transplanted CRC models were established by subcutaneous injection. Cell Counting Kit-8, flow cytometry and western blotting assays were performed, and immunohistochemistry staining was studied. The cytokines participated in chemoresistance was validated with reverse transcriptase-polymerase chain reaction and heatmap. Results Snail-expression fibroblasts are discovered in human and mouse spontaneous CRCs. Overexpression of Snail induces 3T3 fibroblasts transdifferentiation to CAFs. CT26 co-cultured with 3T3-Snail resisted the impairment from 5-fluorouracil and paclitaxel in vitro. The subcutaneous transplanted tumor models included 3T3-Snail cells develop without restrictions even after treating with 5-fluorouracil or paclitaxel. Moreover, these chemoresistant processes may be mediated by CCL1 secreted by Snail-expression fibroblasts via transforming growth factor /nuclear factor-B signaling pathways. Conclusion Taken together, Snail-expressing 3T3 fibroblasts display CAFs properties that support 5-fluorouracil and paclitaxel chemoresistance in CRC via participation of CCL1 and suggest that inhibition of the Snail-expression fibroblasts in tumor may be a useful strategy to limit chemoresistance.