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纳米尺度下水液滴撞击固体表面润湿性行为的分子动力学模拟

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原子与分子物理学报 2025年第2期42卷 91-97页

作者：王美婷祁影霞陶杰陈曦杨宇水张蕾刘妮杨果成上海理工大学能源与动力工程学院上海200093 上海海立集团股份有限公司上海201206

本文采用分子动力学方法研究纳米尺度下水液滴碰撞铜壁面的润湿过程,水滴温度和固液作用强度对润湿性行为的影响以及直径为4.67 nm球形液滴在273 K-353 K温区、固液作用强度在1-3范围内,水滴的润湿行为和平衡接触角与温度、固液作用强... 详细信息

本文采用分子动力学方法研究纳米尺度下水液滴碰撞铜壁面的润湿过程,水滴温度和固液作用强度对润湿性行为的影响以及直径为4.67 nm球形液滴在273 K-353 K温区、固液作用强度在1-3范围内,水滴的润湿行为和平衡接触角与温度、固液作用强度之间的变化关系.研究结果显示:液滴在不同润湿性壁面上会产生明显不同的润湿演化特性.模拟结果表明对于亲水材料,由于壁面附近水分子所受的势能束缚随温度升高而增强,平衡接触角则相应减小;对于疏水材料,由于随温度的升高分子之间增加的势能大于固液之间增加的势能而表现出平衡接触角随着温度升高而增大的趋势.因此,针对其材料亲水性能,可以通过改变温度影响其润湿行为,从而提高传热、传质和自清洁性能.

关键词：润湿性接触角分子动力学模拟纳米液滴

Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400℃

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Journal of Materials Science & Technology 2024年第5期172卷 71-82页

作者： xiang Su Yuan Lei yang chen Hongjie Qu Zhixiang qi Gong Zheng Xu Liu Henggao xiang Guang chen National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Aviation and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213032China

Heat-resistant aluminum alloys are widely used in aerospace and automotive fields for manufacturing hot components due to their advantages in lightweight design and energy ***,the high-temperature strength of existing cast aluminum alloys is always limited to about 100 MPa at 350℃due to coarsening and transformation of strengthening ***,we reveal that the yield strength and ultimate tensile strength of the T6 state Al-8.4Cu-2.3Ce-1.0Mn-0.5Ni-0.2Zr alloy at 400◦C increase by 34%and 44%after re-aging at 300℃for 100 h,and its thermal strength exhibits distinguished ad-vantage over traditional heat-resistant aluminum *** enhanced elevated-temperature strength is attributed to the reprecipitation of the Ni-bearing T-Al_(20)Cu_(2)Mn_(3)phase,whose number density increases over one *** significant segregation of Ni,Ce,and Zr elements at the interfaces helps improve the thermal stability of the T *** thermostable T phase effectively strengthens the matrix by in-hibiting dislocation ***,a highly interconnected 3D intermetallic network along the grain boundaries can still remain after long-term re-aging at 300℃,which is conducive to imposing a drag on the grain boundaries at high *** finding offers a viable route for enhancing the elevated-temperature strength of heat-resistant aluminum alloys,which could provide expanded opportunities for higher-temperature applications.

关键词： Aluminum alloys Precipitation Thermally reinforcement phase Re-aging treatment High-temperature strength

Navigation Route Based Stable Clustering for Vehicular Ad Hoc Networks

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China Communications 2018年第6期15卷 42-56页

作者： Zhiwei yang Weigang Wu Yishun chen Xiaola lin xiang chen School of Data and Computer Science and School of Electronics and Information TechnologySun Yat-sen Univ. Key Lab of EDA Research Institute of Tsinghua University in Shenzhen(RITS)

Due to high node mobility, stability has been always one of the major concerns of vehicle clustering algorithms in vehicular ad hoc networks. In this paper, we propose a novel clustering algorithm based on the information of routes planned by vehicular navigation systems. In the clustering algorithm, we design a residual route time function to quantitatively calculate the overlapping time among vehicles based on route information, with which a novel clusterhead selection metric is presented. We further design a mechanism of future-clusterhead, which can help avoid message exchanges at intersections and reduce the overhead of cluster maintenance. The simulation results show that, compared with previous works, our clustering algorithm can achieve higher stability and at the same time lower communication cost.

关键词： VANET clustering mobile com-puting navigation route ad hoc networks

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Insufficient MIRO1 contributes to declined oocyte quality during reproductive aging

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Science China Life Sciences 2025年

作者： Zhen-Nan Pan Hao-lin Zhang Kun-Huan Zhang Jia-qian Ju Jing-Cai Liu Shao-chen Sun College of Animal Science and Technology Nanjing Agricultural University Reproductive Medicine Centre The Affiliated Yantai Yuhuangding Hospital of Qingdao University

Mitochondrial Rho-GTPase 1 (MIRO1) is an outer mitochondrial membrane protein which regulates mitochondrial transport and mitophagy in mitosis. In present study, we reported the crucial roles of MIRO1 in mammalian oocyte meiosis and its potential relationship with aging. We found that MIRO1 expressed in mouse and porcine oocytes, and its expression decreased in aged mice. MIRO1 deficiency caused the failure of meiotic resumption and polar body extrusion in both mouse and porcine oocytes, which could be rescued by exogenous MIRO1supplementation. Mass spectrometry data indicated that MIRO1 associated with several cytoskeleton and cell cycle-related proteins, and MIRO1 regulated motor protein Dynein for microtubule-organizing centers (MTOCs) dynamics at germinal vesicle (GV) stage, which determined meiotic resumption. Furthermore, we found that MIRO1 regulated Aurora A and kinesin family member 11 (KIF11) for meiotic spindle assembly in oocytes. Besides, MIRO1 associated with several mitochondria-related proteins dynamic-related protein 1 (DRP1),Parkin and lysosomal-associated membrane protein 2 (LAMP2) for mitochondrial dynamics and mitophagy during oocyte meiosis. Taken together, our results suggested that MIRO1 played pivotal roles in meiotic resumption, spindle assembly and mitochondrial function in mouse and porcine oocytes, and its insufficiency might contribute to the oocyte maturation defects during aging.

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Symplectic Convexity for Orbifolds

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Acta Mathematica Sinica,English Series 2008年第4期24卷 555-564页

作者： qi lin yang Mathematical Department Tsinghua University Beijing 100084 P. R. China

Let a connected compact Lie group G act on a connected symplectic orbifold of orbifold fundamental group Г. If the action preserves the symplectic structure and there is a G-equivariant and mod-Г proper momentum map for the lifted action on the universal branch covering orbifold, and if the lifted G-action commutes with that of Г, then the symplectic convexity theorem is still true for this kind of lifted Hamiltonian action.

关键词： momentum map mod-F proper map symplectic orbifold

Neutral excitation and bulk gap of fractional quantum Hall liquids in disk geometry

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Chinese Physics B 2019年第6期28卷 20-26页

作者： Wu-qing yang qi Li lin-Peng yang Zi-xiang Hu Department of Physics Chongqing UniversityChongqing 401331China Department of Physics South University of Science and Technology of ChinaShenzhen 518055China School of Physics and Technology Wuhan UniversityWuhan 430072China

For the numerical simulation of the fractional quantum Hall(FQH) effects on a finite disk, the rotational symmetry is the only symmetry that is used in diagonalizing the Hamiltonian. In this work, we propose a method of using the weak translational symmetry for the center of mass of the many-body system. With this approach, the bulk properties, such as the energy gap and the magneto-roton excitation are consistent with those in the closed manifolds like the sphere and torus. As an application, we consider the FQH phase and its phase transition in the fast rotated dipolar fermions. We thus demonstrate the disk geometry having versatility in analyzing the bulk properties beside the usual edge physics.

关键词： fractional quantum Hall bulk states edge states magneto-roton dipolar–dipolar interaction

Privacy Protection for Blockchain-Based Healthcare IoT Systems: A Survey

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1757-1776页

作者： Minfeng qi Ziyuan Wang qing-Long Han Jun Zhang Shiping chen yang xiang School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyHawthorn3122VictoriaAustralia Faculty of Data Science City University of MacaoMacaoChina CSIRO Data61 SydneyNew South WalesAustralia

To enable precision medicine and remote patient monitoring,internet of healthcare things(IoHT)has gained significant interest as a promising *** the widespread use of IoHT,nonetheless,privacy infringements such as IoHT data leakage have raised serious public *** the other side,blockchain and distributed ledger technologies have demonstrated great potential for enhancing trustworthiness and privacy protection for IoHT *** this survey,a holistic review of existing blockchain-based IoHT systems is conducted to indicate the feasibility of combining blockchain and IoHT in privacy *** addition,various types of privacy challenges in IoHT are identified by examining general data protection regulation(GDPR).More importantly,an associated study of cutting-edge privacy-preserving techniques for the identified IoHT privacy challenges is ***,several challenges in four promising research areas for blockchain-based IoHT systems are pointed out,with the intent of motivating researchers working in these fields to develop possible solutions.

关键词： Blockchain internet of healthcare things(IoHT) privacy-preserving techniques(PPTs).

A Case-Finding Clinical Decision Support System to Identify Subjects with Chronic Obstructive Pulmonary Disease Based on Public Health Data

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Tsinghua Science and Technology 2023年第3期28卷 525-540页

作者： Xinshan lin Yi Lei Jun chen Zhihui Xing ting yang qing Wang chen Wang Department of Pulmonary and Critical Care Medicine China-Japan Friendship HospitalBeijing 100029China School of Software Engineering the Faculty of Information TechnologyBeijing University of TechnologyBeijing 100124China Intelligent Healthcare Unit Baidu IncBeijing 100093China Department of Automation Tsinghua UniversityBeijing 100084China Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100005China

Chronic obstructive pulmonary disease(COPD)is a serious chronic respiratory *** the ability to identify patients with COPD in primary medical institutions is important to prevent and treat the *** the continuous development of medical digitization,the application of big data informatization in the medical and health fields has become ***,applying innovative technologies such as big data analysis,machine learning,and artificial intelligence-assisted decision-making in the medical field has become an interdisciplinary research *** on the identification and diagnosis of COPD in the high-risk population,this study proposes a convenient and effective clinical decision support system to help identify patients with COPD in primary health *** results of the preliminary experiments show that the proposed method is convenient and effective compared with the existing methods.

关键词： artificial intelligence machine learning case finding chronic obstructive pulmonary disease(COPD) clinical decision support system(CDSS)

Hydrogen solubility prediction for diesel molecules based on a modified Henry equation

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Petroleum Science 2022年第1期19卷 363-374页

作者： Run Guo xiang Bai yang Lu lin-Zhou Zhang Xing-Ying Lan Zhen-Tao chen Quan Shi Suo-qi Zhao State Key Laboratory of Heavy Oil Processing&Petroleum Molecular Engineering Center(PMEC) China University of PetroleumBeijing 102249People's Republic of China

Diesel hydrotreatment removes heteroatoms and polycyclic aromatics in diesel in the presence of highpressure hydrogen *** hydrogen solubility is the basis for hydrogen consumption prediction and process design/*** the presented study,we established a method to predict the hydrogen solubility of diesel molecules and mixture.A modified Henry equation was proposed to illustrate the hydrogen solubility variation among the temperature and *** parameters of the modified Henry equation for typical molecules were regressed from literature *** we established an empirical correlation between the parameter and the structure and property of *** method was then combined with a molecular-level compositional model to accurately predict the hydrogen solubility in diesel,illustrating the validity of the method.

关键词： Diesel hydrotreatment Hydrogen solubility Modified henry equation Molecular-level compositional model