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1,426 results on '"Sun, Jianfei"'

151. Simulation study on mass transfer characteristics and disk structure optimization of a rotating disk reactor with high viscosity region.

Author

Chen, Xupeng, Sun, Jianfei, Wu, Jintao, Zhang, Yaxin, and Yin, Jianzhong

Subjects
ROTATING disks, MASS transfer, VISCOSITY, LIQUID films, COMPUTATIONAL fluid dynamics, PHOTOVOLTAIC power systems
Abstract

Due to the excellent film‐forming specific surface area of the disk reactor, its application in the polymer devolatilization process can greatly improve the devolatilization performance of the equipment. In view of this, the fluid volume function method in computational fluid dynamics is used to simulate the film forming performance and surface renewal performance in high viscosity zone of disk reactor. In the disk window area, the liquid film thickness becomes thinner and the surface update frequency becomes faster, indicating that the disk window has a positive effect. The devolatilization performance of five new disk structures under different operating conditions is compared and analyzed. It was found that the influence of liquid level height on film area was greater than that of viscosity and rotation speed, the porous sector disk has excellent surface renewal performance and the baffle can achieve better mass transfer efficiency at a distance of 45–60 mm from the disk. [ABSTRACT FROM AUTHOR]

Published
2023
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171. Secure Source Identification Scheme for Revocable Instruction Sharing in Vehicle Platoon

Author

Zhao, Yanan, Yu, Haiyang, Liang, Yuhao, Brighente, Alessandro, Conti, Mauro, Sun, Jianfei, and Ren, Yilong

Abstract

The secure transmission of instructions among vehicles in a platoon is one of the most essential needs for a vehicle platoon. Despite the existence of cryptographic methods to securely share instructions, instruction sharing is still subject to forgery, tampering, and denial-of-service attacks. Therefore, it is urgent to find a solution to perform data source identification to filter out irrelevant information (not instructions) while ensuring the authenticity of encrypted instructions is urgent to address. In addition, immediate revocation of credentials is also a crucial requirement for a vehicle platoon when an authorized vehicle member misbehaves. In this paper, we propose the first Secure Source Identification Scheme for Revocable Instruction Sharing (SI-RIS) to securely simultaneously achieve bilateral fine-grained access control, data source identification, immediate vehicle user revocation, and efficient encryption in vehicle platoons. Specifically, our SI-RIS solution supports fine-grained access control for both the sender and receiver over the encrypted instructions. As a result, only authorized correspondents are able to access the commands. Furthermore, upon identification of malicious members in the platoon, our SI-RIS provides an efficient direct vehicle user revocation mechanism capable of immediate revocation credentials without affecting other vehicles. We prove the security of our SI-RIS via rigorous mathematical security proof. Moreover, performance evaluation and comparisons illustrate the feasibility and practicability of SI-RIS for vehicle platoon.

Published
2024
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172. A Tamper-Resistant Broadcasting Scheme for Secure Communication in Internet of Autonomous Vehicles

Author

Sun, Jianfei, Tao, Junyi, Zhang, Hao, Zhao, Yanan, Nie, Liming, Cheng, Xiaochun, and Zhang, Tianwei

Abstract

As increasingly prevalent technologies in autonomous driving, 5G and the Internet of Things (IoT), Internet of autonomous vehicle (IoAV) technology is recognized as a technique that is capable of disruptively changing the way people travel and greatly improving the travel experience. In the IoAV scenarios, information dissemination is inseparable from the interaction between autonomous vehicles and smart infrastructure. However, existing efforts rarely focus on the secrecy, authenticity of interactive data and flexible one-to-many communication between autonomous vehicles. In this paper, we propose a tamper-resistant broadcasting (TRBS) scheme for secure communication, which handles the inefficiencies and insecurity of existing identity-based broadcast signcryption solutions. Not only can our TRBS protect communication data from being illegally accessed, forged, or tampered with by malicious vehicles, but it can also enable efficient and flexible secure information dissemination between autonomous vehicles. We also exhibit strict security proofs and experimental evaluations to demonstrate our TRBS is secure and efficient for real-world applications.

Published
2024
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179. Magnetic vagus nerve stimulation alleviates myocardial ischemia-reperfusion injury by the inhibition of pyroptosis through the M2AChR/OGDHL/ROS axis in rats.

Author

Lu, Yao, Chen, Kaiyan, Zhao, Wei, Hua, Yan, Bao, Siyuan, Zhang, Jian, Wu, Tianyu, Ge, Gaoyuan, Yu, Yue, Sun, Jianfei, and Zhang, Fengxiang

Subjects
VAGUS nerve stimulation, VAGUS nerve, MYOCARDIUM, REPERFUSION injury, PYROPTOSIS, AUTONOMIC nervous system, MYOCARDIAL infarction
Abstract

Background: Myocardial ischemia-reperfusion (I/R) injury is accompanied by an imbalance in the cardiac autonomic nervous system, characterized by over-activated sympathetic tone and reduced vagal nerve activity. In our preceding study, we pioneered the development of the magnetic vagus nerve stimulation (mVNS) system. This system showcased precise vagus nerve stimulation, demonstrating remarkable effectiveness and safety in treating myocardial infarction. However, it remains uncertain whether mVNS can mitigate myocardial I/R injury and its specific underlying mechanisms. In this study, we utilized a rat model of myocardial I/R injury to delve into the therapeutic potential of mVNS against this type of injury. Results: Our findings revealed that mVNS treatment led to a reduction in myocardial infarct size, a decrease in ventricular fibrillation (VF) incidence and a curbing of inflammatory cytokine release. Mechanistically, mVNS demonstrated beneficial effects on myocardial I/R injury by inhibiting NLRP3-mediated pyroptosis through the M2AChR/OGDHL/ROS axis. Conclusions: Collectively, these outcomes highlight the promising potential of mVNS as a treatment strategy for myocardial I/R injury. [ABSTRACT FROM AUTHOR]

Published
2023
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187. Transfection of clMagR/clCry4 imparts MR-T2 imaging contrast properties to living organisms (E. coli) in the presence of Fe3+ by endogenous formation of iron oxide nanoparticles

Author

Li, Nuan, primary, Xue, Le, additional, Mai, Xiaoli, additional, Wang, Peng, additional, Zhu, Chenzhuo, additional, Han, Xiaofeng, additional, Xie, Yuanyuan, additional, Wang, Bin, additional, Ge, Yuqing, additional, Zhang, Yewei, additional, and Sun, Jianfei, additional

Published
2023
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