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509 results on '"Bai, Lijuan"'

4. Continuous Cooling Phase Transformation Prediction Model of 20CrMnTiH

Author

Yang Ting, Duan Luzhao, Liu Xu, Bai Lijuan, Zhang Yunfei, Sun Li

Subjects
20crmntih steel； cct curves； phase transition dynamics； composition fluctuation； phase transition model, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

The thermal expansion curves of 20CrMnTiH test steel with three compositions at different cooling rates were measured by DIL805 type quench deformation expansion instrument ， and the microstructures at room temperature were observed， the continuous cooling transition （CCT） curves were drawn. The test results show that the composition fluctuation mainly affects the cooling range of bainite and martensite phase transformation during the cooling transformation of 20CrMnTiH， and has little effect on the critical phase transformation temperature. The kinetic parameters of martensitic transformation of the three test steels were fitted by using K-M equation. Combined with the optimized Li empirical model and the regression equation of critical transition temperature， a prediction model of phase transformation prediction model of ferrite，pearlite and bainite during continuous cooling of 20CrMnTiH was established ，the influence of composition fluctuation on CCT curve of the test steels were predicted successfully. Furthermore， the end-quenching simulation model of 20CrMnTiH steel was established by finite element analysis method， which can better predict the influence of composition fluctuation on the hardenability of the test steel. This method can provide reference for the composition optimization design and material selection of gear steel.

Published
2024
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26. Major, trace and platinum-group element geochemistry of harzburgites and chromitites from Fuchuan, China, and its geological significance

Author

Liu Ting, Wu Jun, Tan Qi, and Bai Lijuan

Subjects
platinum-group elements, a back-arc spreading ridge, podiform chromitites, the fuchuan ophiolite, the jiangnan orogen, Geology, QE1-996.5
Abstract

The Fuchuan peridotites have dual features of mid-ocean ridge basalt and supra-subducted zone peridotites and have been experienced high degrees of partial melting; chondrite-normalized “U”-shaped rare earth element (REE) patterns of Fuchuan harzburgites indicate that light REE enriched SSZ melts or fluids have participated in the interaction with peridotites; the Fuchuan chromitites are enriched in IPGE and depleted in PPGE, which are basically consistent with high-Al chromitites worldwide, and the low PGE concentrations of chromitites reflect a lack of sulfur saturation of the parental melts during an early stage of their crystallization; the Fuchuan peridotites and chromitites are believed to be formed in a back-arc spreading ridge between the Yangtze and Cathaysia blocks during 860–820 Ma.

Published
2022
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29. Rod-Like Tetraphenylethylene-Based Metal–Organic Framework for Ultrasensitive Detection of Neuron-Specific Enolase.

Author

Zhang, Haoran, Yuan, Yonghua, Qing, Min, Zhou, Jing, Liu, Junjie, and Bai, Lijuan

Abstract

The hunt for stable and effective luminous materials has always been a major focus of investigation and research during the development of electrochemiluminescence (ECL). However, numerous challenges persist even in current times. The aggregation-induced emission (AIE) ligand 1,1,2,2-tetra-(4-carboxylbiphenyl)-ethylene and La3+ were used in this study to create a rod-like metal–organic framework (La-TCBPE-MOF, LTM), which was then constructed into an inventive ECL immunosensor for the ultrasensitive detection of neuron-specific enolase (NSE). LTM showed stronger ECL signals compared to H4TCBPE aggregations, which can be attributed not only to the immobilization of H4TCBPE ligands within the rigid MOF matrix, which restricted free intramolecular rotation and vibration, but also to the reduction of nonradiative transitions. Furthermore, the loading capacity of the H4TCBPE luminophore was significantly boosted by anchoring H4TCBPE into the rigid MOF as a bridging ligand. Consequently, a larger ECL intensity was produced due to the increased amount of H4TCBPE luminophores being stimulated. As anticipated, the fabricated ECL immunosensor exhibited a broad linear range spanning from 100 fg mL–1 to 100 ng mL–1, accompanied by an impressively low limit of detection (LOD) of 21.5 fg mL–1. Moreover, the ECL immunosensor was effectively utilized for measurement in human serum. In summary, this research demonstrated a successful integration of AIE into the field of ECL, enabling rapid, sensitive, and highly precise detection of NSE. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Surface-Activated Ti3C2TxAdsorption of Acetylene Black Coupled with Polyaniline as a Signal Tag for the Detection of the ESAT-6 Antigen of Mycobacterium tuberculosis

Author

Zuo, Jianli, Yuan, Yonghua, Qing, Min, Chen, Yuhan, Huang, He, Zhou, Jiaxu, Bai, Lijuan, and Liang, Hongwen

Abstract

Early secretory antigenic target-6 (ESAT-6) is regarded as the most immunogenic protein produced by Mycobacterium tuberculosis, whose detection is of great clinical significance for tuberculosis diagnosis. However, the detection of the ESAT-6 antigen has been hampered by the expensive cost and complex experimental procedures, resulting in low sensitivity. Herein, we developed a titanium carbide (Ti3C2Tx)-based aptasensor for ESAT-6 detection utilizing a triple-signal amplification strategy. First, acetylene black (AB) was immobilized on Ti3C2Txthrough a cross-linking reaction to form the Ti3C2Tx-AB-PAn nanocomposite. Meanwhile, AB served as a conductive bridge, and Ti3C2Txcan synergistically promote the electron transfer of PAn. Ti3C2Tx-AB-PAn exhibited outstanding conductivity, high electrochemical signals, and abundant sites for the loading of ESAT-6 binding aptamer II (EBA II) to form a novel signal tag. Second, N-CNTs were adsorbed on NiMn layered double hydride (NiMn LDH) nanoflowers to obtain NiMn LDH/N-CNTs, exhibiting excellent conductivity and preeminent stability to be used as electrode modification materials. Third, the biotinylated EBA (EBA I) was immobilized onto a streptavidin-coated sensing interface, forming an amplification platform for further signal enhancement. More importantly, as a result of the synergistic effect of the triple-signal amplification platform, the aptasensor exhibited a wide detection linear range from 10 fg mL–1to 100 ng mL–1and a detection limit of 4.07 fg mL–1for ESAT-6. We envision that our aptasensor provides a way for the detection of ESAT-6 to assist in the diagnosis of tuberculosis.

Published
2024
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