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Your search keyword '"He, Fangfang"' showing total 342 results
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342 results on '"He, Fangfang"'

19. Global dynamics of a tumor-immune model with an immune checkpoint inhibitor.

Author

He, Fangfang, zhu, Huiyan, Lin, Jinzhang, and Ou, Yingchen

Subjects
*PROGRAMMED cell death 1 receptors, *IMMUNE checkpoint inhibitors, *CELL populations, *CELL death, *T cells, *PROGRAMMED death-ligand 1
Abstract

In this paper, a mathematical ordinary differential tumor-immune model is proposed based on an immune checkpoint inhibitor, which is an innovative method for tumor immunotherapies. Two important factors in tumor-immune response are the programmed cell death protein 1 (PD-1) and its ligand PD-L1. The model consists of three populations: tumor cells, activated T cells and anti-PD-1. By analyzing the dynamics of the model, it is found that there is always a unique tumor-free equilibrium and at most two tumor interior equilibria. The nonexistence of nontrivial positive periodic orbits is established by using the new Dulac function, and then a global dynamics of the model is obtained. The conclusions of our analysis show that increasing the possibility of T cells killing tumor cells (p), early detection of tumor cells, or the use of PD-1 inhibitors to activate T cells are effective in eliminating tumor cells. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Ultra‐Long Lifespan Ni Based Porphyrin Complex Cathode for Organic Alkali Metal Batteries.

Author

Peng, Xi, Ren, Bo, Sun, Caihong, Liao, Yao, He, Fangfang, Li, Tianfu, Sun, Xiujuan, Chen, Zhi, Liu, Wei, and Gao, Ping

Subjects
ALKALI metals, ELECTRIC batteries, ALKALI metal ions, ORGANOMETALLIC compounds, PORPHYRINS, CATHODES, NICKEL, POTASSIUM
Abstract

The high solubility and low intrinsic electronic conductivity are the key challenges for application of organic materials in electrochemical energy storage. Herein, a functionalized porphyrin complex of [5,15‐Bis(ethynyl)‐10,20‐diphenylporphinato]nickel(II) (NiDEPP) is proposed as new cathode material for alkali metal ion batteries. Owing to the in‐situ electropolymerization, NiDEPP became extremely stable after initial cycling. Therefore, the NiDEPP electrode delivers remarkable reversible capacity of 153 mAh g−1 at 1 A g−1, a high specific energy density of 459 Wh kg−1 and extremely stable cyclability for 4000 cycles with negligible capacity decay in organic lithium batteries. It can further be cycled upto 10000 cycles. Due to the bipolar capability of porphyrin ring, this cathode can also be extended in both sodium and potassium based organic cells. Similar charge storage mechanism enables highly reversible capacity and long‐term cycling stability. This study would open a pathway toward new organic electrodes with long cycling life and high energy densities for renewable charge storage devices. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Electrohydrogenation of Nitriles with Amines by Cobalt Catalysis.

Author

Wang, Tiantian, He, Fangfang, Jiang, Wei, and Liu, Jie

Subjects
*COBALT, *CATALYTIC hydrogenation, *AMINES, *RADIOLABELING, *CATALYSIS
Abstract

Catalytic hydrogenation of nitriles represents an efficient and sustainable one‐step synthesis of valuable bulk and fine chemicals. We report herein a molecular cobalt electrocatalyst for selective hydrogenative coupling of nitriles with amines using protons as the hydrogen source. The key to success for this reductive reaction is the use of an electrocatalytic approach for efficient cobalt‐hydride generation through a sequence of cathodic reduction and protonation. As only electrons (e−) and protons (H+) as the redox equivalent and hydrogen source, this general electrohydrogenation protocol is showcased by highly selective and straightforward synthesis of various functionalized and structurally diverse amines, as well as deuterium isotope labeling applications. Mechanistic studies reveal that the electrogenerated cobalt‐hydride transfer to nitrile process is the rate‐determining step. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Pn@MF@SiO2 Double‐Shelled Phase Change Microcapsules with High Latent Heat and Low Leakage Rate.

Author

Li, Yujiao, Cai, Tianyu, Li, Yongsheng, Jiang, Zhuoni, He, Fangfang, Chen, Zhengguo, Ali, Hafiz Muhammad, Shehzad, Nadia, Waqas, Adeel, and Yang, Wenbin

Subjects
LATENT heat, HEAT storage, THERMAL conductivity, MELAMINE, HEAT capacity, LEAKAGE
Abstract

Microencapsulation of paraffin with melamine formaldehyde shell (Pn@MF) shows the drawbacks of low thermal conductivity. Hence, we constructed SiO2 shells on Pn@MF phase change microcapsules by interfacial polycondensation to obtain Pn@MF@SiO2 double‐shelled microcapsules. The effect of tetraethoxysilane (TEOS) contents on the performance of Pn@MF@SiO2 was discussed in detail. As the TEOS contents increased, the thermal conductivity of Pn@MF@SiO2 gradually increased, reaching up to 0.376 W m−1 K−1. The Pn@MF@SiO2 have exhibited superior leakage‐proof properties and thermal reliability through double‐shelled protection, and the highest reduction in leakage rate reached 45.06 % compared to Pn@MF microcapsules. The Pn@MF@SiO2‐3 with the lowest enthalpy still exhibit a latent heat storage capacity of more than 176 J/g, which displayed outstanding latent heat storage/release capability and good anti‐permeable property. [ABSTRACT FROM AUTHOR]

Published
2024
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32. A Framework for Shop Floor Material Delivery Optimization Based on RFID-Enabled Production Big Data

Author

Zhao, Xin, Zhang, Wei, Meng, Hengling, He, Fangfang, Ren, Shan, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Xhafa, Fatos, editor, Patnaik, Srikanta, editor, and Tavana, Madjid, editor

Published
2019
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