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Nano friction behaviour between magnetic materials and copper considering the inter-diffusion effect

Friction 2024年第7期12卷 1532-1547页

作者： Zilin LI lisha dou Shiyu YANG Huajiang OUYANG Qichen ZHU Xiaoyang CHEN Xin JIA Shuaiwei dou Xiaolong CUI Yudong ZHANG Jingjiang QIU Guochen QI Bangbang NIE Pan LIU Ronghan WEI School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China Engineering Technology Research Center of Henan Province for MEMS Manufacturing and Application Zhengzhou UniversityZhengzhou 450001China Institute of Intelligent Sensing Zhengzhou UniversityZhengzhou 450001China School of Engineering University of LiverpoolLiverpool L693GHUK School of Cyber Science and Engineering&Hanwei Institute of Internet of Things Zhengzhou UniversityZhengzhou 450001China

Copper,permalloy,cobalt,and silicon are the materials that have been widely utilised in magnetic *** the size of interest is down to the nanoscale,the inter-diffusion between certain materials becomes *** paper studies the nanoscale friction characteristics between frictional pairs with and without inter-diffusion properties through the atomic force *** distinct evolution features of nanoscale friction force when inter-diffusion is involved are discovered experimentally,which is also confirmed through theoretical ***,through the thin film deposition method,four pairs of contact materials(Cu–Ni_(81)Fe_(19),Si–Ni_(81)Fe_(19),Cu–Co,Cu–Si)are designed for friction tests,in which diffusion occurs at the interface of Cu–Ni_(81)Fe_(19)***,the effects of sliding velocity and loading force on the nano friction of each pair are *** is found that regardless of the diffusion phenomenon:(1)the adhesion force values exhibit a notable correlation to the values of the friction force;(2)the friction force in all four material pairs consistently increases with the growth of the normal loading force,although the growth rate may *** terms of the sliding velocity effect,the friction forces of immiscible materials(Si–Ni_(81)Fe_(19),Cu–Co,and Cu–Si)are found to increase with the increasing sliding ***,the friction force of Cu–Ni_(81)Fe_(19),decreases with the increasing sliding ***,a compositive friction model considering both the velocity and the normal force effect was proposed,which shows good agreement with the experimental results and explains the nano friction behaviour of both miscible and immiscible metals.

关键词： atomic force microscope friction force normal load sliding velocity

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住宅建设项目交通系统优化方案研究

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山东交通科技 2021年第5期 132-134页

作者：窦丽莎赵海龙潍坊市规划编制研究中心山东潍坊261000 潍坊市市政工程设计研究院有限公司山东潍坊261000

针对住宅建设项目内、外交通系统分别提出优化策略,形成了框架式的优化方案。外部交通系统优化措施有完善周边路网、优化交通设施、提高公共交通服务水平和改善慢行交通环境;内部交通系统优化措施有合理设置出入口、科学交通组织和合理... 详细信息

针对住宅建设项目内、外交通系统分别提出优化策略,形成了框架式的优化方案。外部交通系统优化措施有完善周边路网、优化交通设施、提高公共交通服务水平和改善慢行交通环境;内部交通系统优化措施有合理设置出入口、科学交通组织和合理布局停车设施等。以中海·凯旋门为例进行分析,运用典型的优化措施,为住宅建设项目交通系统优化提供技术支持。

关键词：住宅建设项目交通系统优化交通设施交通组织

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纳米尺度下载荷和滑动速度对表面摩擦特性的影响

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微纳电子技术 2022年第10期59卷 1017-1026页

作者：豆丽莎李姿琳王晓翠陈晓阳贾鑫卫荣汉齐国臣郑州大学力学与安全工程学院郑州450001 郑州大学智能传感研究院郑州450001 温州大学机电工程学院浙江温州325000

使用原子力显微镜(AFM)对Si-Ni_(81)Fe_(19)材料间的接触力学性能进行测试,研究Si-Ni_(81)Fe_(19)材料间的摩擦力随法向载荷和滑动速度的变化规律。首先,通过薄膜沉积的方式在硅基板上制备Ni_(81)Fe_(19)样品。之后,通过接触模型分析确... 详细信息

使用原子力显微镜(AFM)对Si-Ni_(81)Fe_(19)材料间的接触力学性能进行测试,研究Si-Ni_(81)Fe_(19)材料间的摩擦力随法向载荷和滑动速度的变化规律。首先,通过薄膜沉积的方式在硅基板上制备Ni_(81)Fe_(19)样品。之后,通过接触模型分析确定Johnson-Kendall-Roberts模型对于Si-Ni_(81)Fe_(19)材料间接触描述的适用性,并确定了材料间的真实接触面积。随后,基于AFM中的横向力显微镜(LFM),使用Si探针测试Si-Ni_(81)Fe_(19)材料间的摩擦力,并分析其在7~107 nN载荷和20~300 nm/s滑动速度下的变化规律。结果显示,Si-Ni_(81)Fe_(19)材料间的摩擦力随法向载荷增加呈线性增大趋势,并且该规律不受滑动速度的影响。另一方面,小载荷下Si-Ni_(81)Fe_(19)材料间的摩擦力与滑动速度的自然对数呈正比;而在大载荷下,摩擦力与滑动速度呈线性增大的趋势。

关键词：原子力显微镜(AFM) 横向力显微镜(LFM) 纳米摩擦法向载荷滑动速度

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模糊PID玉米免耕机排种施肥控制方法研究

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农机化研究 2025年第1期47卷 178-184页

作者：张红娟窦新宇唐山学院智能与信息工程学院河北唐山063000

为了实现免耕机播种量和施肥量的精确控制,基于模糊PID控制,设计了控制系统。首先,建立排种量模型,以排种轴转速为控制量;其次,建立施肥量控制模型,分析排肥轴转速、排肥轴长度和免耕机前进速度对于排肥量误差的影响,选择排肥轴转速为... 详细信息

为了实现免耕机播种量和施肥量的精确控制,基于模糊PID控制,设计了控制系统。首先,建立排种量模型,以排种轴转速为控制量;其次,建立施肥量控制模型,分析排肥轴转速、排肥轴长度和免耕机前进速度对于排肥量误差的影响,选择排肥轴转速为控制量;再次,采用模糊PID控制的方法,对驱动电机进行调速,进而实现对排肥轴和排种轴转速的控制,完成排种量和排肥量的调整;最后,对系统进行测试。测试结果表明:电机转速从0调整到50 r/min的响应时间为0.8 s,施肥量变异系数分布区间为[2.6,4.1]。

关键词：模糊PID控制播种量模型施肥量模型玉米

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Asymptotic Behaviors for Critical Branching Processes with Immigration

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Acta Mathematica Sinica,English Series 2019年第4期35卷 537-549页

作者： dou dou LI Mei ZHANG School of Mathematical Sciences Laboratory of Mathematics and Complex SystemsBeijing Normal University

In this paper, we investigate the asymptotic behaviors of the critical branching process with immigration {Z_n, n ≥ 0}. First we get some estimation for the probability generating function of Zn. Based on it, we get a large deviation for Z_(n+1)/Z_n. Lower and upper deviations for Zn are also studied. As a by-product, an upper deviation for max_(1≤i≤n) Z_i is obtained.

关键词： Critical branching process immigration large deviations

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Effect of magnetic flow and external forcing current on mixed bursting in the pre-Botzinger complex

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Chinese Physics B 2019年第11期28卷 120-128页

作者： dou-dou Guo Zhuo-Sheng Lu School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

The pre-B?tzinger complex(pre-B?tC) in mammalian brainstem is essential for the generation of respiratory *** dynamic studies on the pre-B?tC neuron have been focused on its firing activities modulated by the ion conductances rather than that by the electromagnetic radiation or the external forcing current. In this paper, by adding the electromagnetic radiation and external forcing current to Park and Rubin’s model, we mainly investigate the influences of those two factors on the mixed bursting(MB) of single pre-B?tC neuron. First, we explore how the variation of external forcing current affects the MB patterns of the system with non-vanishing magnetic flux. We classify the MB patterns and show their dynamic mechanism through fast-slow decomposition and bifurcation analysis. Then, by modifying the feedback coefficient, we further analyze the sole effect of electromagnetic radiation on the firing activities of the system. Our results may be instructive in understanding the dynamical behavior of pre-B?tC neuron.

关键词： pre-Botzinger complex mixed bursting magnetic flow dynamical analysis

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Representation learning on textual network with personalized Page Rank

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Science China(Information Sciences) 2021年第11期64卷 95-104页

作者： Teng LI Yong dou National Laboratory for Parallel and Distributed Processing National University of Defense Technology

Representation learning on textual network or textual network embedding, which leverages rich textual information associated with the network structure to learn low-dimensional embedding of vertices, has been useful in a variety of tasks. However, most approaches learn textual network embedding by using direct neighbors. In this paper, we employ a powerful and spatially localized operation: personalized Page Rank(PPR) to eliminate the restriction of using only the direct connection relationship. Also, we analyze the relationship between PPR and spectral-domain theory, which provides insight into the empirical performance boost. From the experiment, we discovered that the proposed method provides a great improvement in linkprediction tasks, when compared to existing methods, achieving a new state-of-the-art on several real-world benchmark datasets.

关键词： representation learning network embedding PageRank textual network personalized PageRank

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Limit Theorems for Critical Galton-Watson Processes with Immigration Stopped at Zero

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Acta Mathematica Sinica,English Series 2024年第2期40卷 435-450页

作者： dou dou LI Mei ZHANG Xian Yu ZHANG College of Statistics and Data Science Faculty of ScienceBeijing University of TechnologyBeijing 100124P.R.China Laboratory of Mathematics and Complex Systems(Ministry of Education) School of Mathematical SciencesBeijing Normal UniversityBeijing 100875P.R.China

In this paper,we consider a critical Galton-Watson branching process with immigration stopped at zero *** precise estimation on the probability generating function of the n-th population are obtained,and the tail prob... 详细信息

关键词： Branching immigration critical life period limit theorems

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VALUE-ADDED SERVICE INVESTING AND PRICING STRATEGIES FOR A TWO-SIDED PLATFORM UNDER INVESTING RESOURCE CONSTRAINT

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Journal of Systems Science and Systems Engineering 2017年第5期26卷 609-627页

作者： Guowei dou Ping He Research Institute of Business Analytics and Supply Chain Management Postdoctoral Station of Theoretical Economics School of Management Shenzhen University Shenzhen Guangdong 518060 PR China School of Management Zhejiang University Hangzhou Zhejiang 310058 PR China

Investing on value-added service （VAS） amplifies users＇ participation and platform profit. However, the investing resource is usually limited in practice. This paper investigates VAS investing and pricing strategies for a two-sided platform under investing resource constraint. We reveal that with VAS investment, Subsidizing can still be done to enlarge users＇ demand, even when the investing cost becomes higher. For optimal pricing strategies, the network effect will be the dominating determinant if the gap between two marginal cross-side benefits （i.e. the benefit that users obtain when each new user join the other side of the platform） is large. Interestingly, we show that with the increase of the marginal investing cost, users might either be priced higher or lower. If the marginal investing cost increases to a high level, and the gap between the two marginal cross-side benefits is large, lowering the access fee for users possessing the higher eross-side network effect does not necessarily compensate more profit loss caused by higher cost. Moreover, after VAS is developed, raising the access fee for those whose marginal investing benefit is large does not necessarily generate more profit as well. The opposite strategy further enlarges users＇ utility, and promotes the investment to benefit more users.

关键词： Network effect optimization two-sided market value-added service investment investingresource constraint

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POTENTIAL INVERSION PROBLEMS FOR COUPLED SYSTEM OF DOWNGOING AND UPCOMING ONE-WAY WAVE EQUATIONS

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Journal of Computational Mathematics 1998年第6期16卷 551-560页

作者： Zhang, GQ dou, XL Chinese Acad Sci ICMSEC State Key Lab Sci & Engn Comp Beijing 100080 Peoples R China Beijing Res Inst Remote Sensing Informat Beijing 100011 Peoples R China

By using wave splitting method the formulation of the two-dimensional potential inversion problem is set up in terms of the coupled system for downgoing and upcoming wavefields. The boundary counditions on the characteristic surface needed for solving the problem are derived by singularity analysis. Two stability theorems are given for the direct problems of the system treated as Cauchy problems in the direction of depth.

关键词： 2-D potential inversion wave splitting singularity analysis

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