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Review of tribological properties of nanoparticle-based lubricants and their hybrids and composites

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Friction 2024年第4期12卷 569-590页

作者： Ye Zar ni HTWE Aws.s.AL-JANABI Yasmin WADZER Hussin MAMAT Ku NOORYAsMIN school of Materials&Mineral Resources Engineering Universiti Sains Malaysia(Engineering Campus)Nibong Tebal 14300Malaysia school of Aerospace Engineering Universiti Sains Malaysia(Engineering Campus)Nibong Tebal 14300Malaysia Universiti sains Malaysia

Due to their encouraging results,nanolubricants have been revolutionary in the field of *** degree,to which the new material may improve the tribology,energy savings,and durability,is a crucial consideration for any new additive to a conventional *** results of the earlier research on carbon,metal,metal oxide,and their composites and hybrid nanolubricants as well as their effects on tribology,are summarized in this review *** most popular measuring methodologies,the tribology results for lubricants with an oil base,biodegradable base,and a water base,as well as the reasons that explain these tribological advancements,are all included in this ***,prospects for more study in this area are emphasized.

关键词： nanolubricants tribology carbon metal metal oxide hybrid

Neural mechanisms of social learning and decision-making

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science China(Life sciences) 2021年第6期64卷 897-910页

作者： Yinmei ni Jian Li school of Psychological and Cognitive sciences and Beijing Key Laboratory of Behavior and Mental Health Peking UniversityBeijing 100871China

One of the hallmarks of human society is the ubiquitous interactions among ***,a significant portion of human daily routine decision making is socially *** economic theory,namely game theory,has prescribed the canonical decision strategy when"rational"social agents have full information about the decision *** reality,however,social decision is often influenced by the trait and state parameters of selves and ***,understanding the cognitive and neural processes of inferring the decision parameters is pivotal for social decision ***,both correlational and causal non-invasive neuroimaging studies have started to reveal the critical neural computations underlying social learning and decision-making,and highlighted the unique roles of"social"brain structures such as temporal-parietal junction(TPJ)and dorsomedial prefrontal cortex(dmPFC).Here we review recent advances in social decision neuroscience and maintain the focus on how the inference about others is dynamically acquired during social learning,as well as how the prosocial(altruistic)behavior results from orchestrated interactions of different brain regions specified under the social utility *** conclude by emphasizing the importance of combining computational decision theory with the identification of neural mechanisms that represent,evaluate and integrate value related social information and generate decision variables guiding behavioral output in the complex social environment.

关键词： social cognition decision-making reinforcement learning value altruism

symmetric Hermitian decomposability criterion,decomposition,and its applications

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Frontiers of Mathematics in China 2022年第5期17卷 961-986页

作者： Guyan ni Bo YANG Department of Mathematics National University of Defense TechnologyChangsha 410073China

The Hermitian tensor is an extension of Hermitian matrices and plays an important role in quantum information *** is known that every symmetric tensor has a symmetric ***,symmetric Hermitian tensor is not the *** this paper,we obtain a necessary and sufficient condition for symmetric Hermitian decomposability of symmetric Hermitian *** a symmetric Hermitian decomposable tensor space is regarded as a linear space over the real number field,we also obtain its dimension formula and ***,if the tensor is symmetric Hermitian decomposable,then the symmetric Hermitian decomposition can be obtained by using the symmetric Hermitian *** the application of quantum information,the symmetric Hermitian decomposability condition can be used to determine the symmetry separability of symmetric quantum mixed states.

关键词： Hermitian tensor tensor decomposition symmetric Hermitian decomposition quantum mixed states quantum entanglement

Multi-verse optimizer based parameters decision with considering tool life in dry hobbing process

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Advances in Manufacturing 2021年第2期9卷 216-234页

作者： Heng-Xin ni Chun-Ping Yan shen-Fu ni Huan shu Yu Zhang state Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400030People’s Republic of China Hefei Meiya Photoelectric Technology Co.Ltd Hefei 230088People’s Republic of China

Dry hobbing has received extensive attention for its environmentally friendly processing *** to the absence of lubricants,hobbing process is highly dependent on process parameters combination since using unreasonable parameters tends to affect the machining ***,the consideration of tool life is frequently ignored in gear ***,to settle the above issues,a multiobjective parameters decision approach considering tool life is ***,detailed quantitative analysis between process parameters and hobbing performance,i.e.,machining time,production cost and tool life is ***,a multi-objective parameters decision-making model is constructed in search for optimum cutting parameters(cutting velocity v,axial feed rate f_(a))and hob parameters(hob diameter d_(0),threads z_(0)).Thirdly,a novel algorithm named multi-objective multi-verse optimizer(MOMVO)is utilized to solve the presented model.A case study is exhibited to show the feasibility and reliability of the proposed *** results reveal that(i)a balance can be achieved among machining time,production cost and tool life via appropriate process parameters determination;(ii)optimizing cutting parameters and hob parameters simultaneously contributes to optimal objectives;(iii)considering tool life provides usage precautions support and process parameters guidance for practical machining.

关键词： Process parameters Decision-making Tool life Dry hobbing Multi-objective multi-verse optimizer(MOMVO)

Advances in Control Technologies for Wastewater Treatment Processes:status, Challenges, and Perspectives

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IEEE/CAA Journal of Automatica sinica 2019年第2期6卷 337-363页

作者： Abdelhamid Iratni ni-Bin Chang the Department of Electrical Engineering Faculty of Science and Technology University of Bordj Bou Arreridj IEEE the Civil Environmental and Construction Engineering Department University of Central Florida

This paper presents a thorough review of control technologies that have been applied to wastewater treatment processes in the environmental engineering regime in the past four decades. It aims to provide a comprehensive technological review for both water engineering professionals and control specialists, giving rise to a suite of up-to-date pathways to impact this field in light of the classified technology hubs. The assessment was conducted with respect to linear control, linearizing control,nonlinear control, and artificial intelligence-based control. The application domain of each technology hub was summarized into a set of comparative tables for a holistic assessment. Challenges and perspectives were offered to these field engineers to help orient their future endeavor.

关键词： Control technologies system engineering wastewater treatment

Unconventional Designs for Functional sodium-sulfur Batteries

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Energy & Environmental Materials 2023年第4期6卷 405-415页

作者： Jiangfeng ni Yichen Liu sheng Zhu school of Physical science and Technology Center for Energy Conversion Materials&Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China Institute of Molecular science Key Laboratory of Chemical Biology and Molecular Engineering of Education MinistryShanxi UniversityTaiyuan 030006China

sodium-sulfur(Na–s)batteries that utilize earth-abundant materials of Na and s have been one of the hottest topics in battery *** low cost and high energy density make them promising candidates for next-generation storage technologies as required in the grid and renewable *** recent years,extensive efforts have been devoted to the diversity and functionalities of Na–s batteries,aiming to extend their potential applications across multiple temporal and spatial ***,we summarize the unconventional designs for the functionalities of Na–s batteries such as flexible batteries,solid-state cells,flame resistance,and operation at extreme *** highlighting these design strategies that help to realize the functionalities,we hope this review offers a pathway to foster the bright future of Na–s batteries in diverse applications.

关键词： flexibility multiple functionalities sodium-sulfur batteries unconventional design

Multi-physical Modeling and Adjusting for Ultrasonic Assisted soft Abrasive Flow Processing

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 111-124页

作者： Yesha ni Yunfeng Tan Dapeng Tan Key Lab of E&M Ministry of Education and Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310014China Collaborative Innovation Center of High-end Laser Manufacturing Equipment Zhejiang Province&Ministry of EducationHangzhou 310014China

The polishing efficiency of the soft abrasive flow(sAF)method is low,which is not in line with the concept of carbon emission reduction in industrial *** address the above issue,a two-phase fluid multi-physics modeling method for ultrasonic-assisted sAF processing is *** acoustics-fluid coupling mechanic model based on the realizable k-ε model and Helmholtz equation is built to analyze the cavitation *** results show that the pro-posed modeling and solution method oriented to ultrasonic-assisted sAF processing have better revealed the flow field evolution *** turbulence kinetic energy at different ultrasonic frequencies and amplitudes is *** results show that the ultrasonic vibration can induce a cavitation effect in the constrained flow chan-nel and promote the turbulence intensity and uniformity of the abrasive flow.A set of comparative polishing experiments with or without ultrasonic vibration are conducted to explore the performance of the proposed *** can be found that the ultrasonic-assisted sAF method can improve the machining efficiency and uniformity,to achieve the purpose of carbon emission *** relevant result can offer a helpful reference for the sAF method.

关键词： soft abrasive flow Ultrasonic vibration Cavitation effect Polishing efficiency Turbulent kinetic energy

Penetration and lubrication evaluation of vegetable oil with nanographite particles for broaching process

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Friction 2021年第6期9卷 1406-1419页

作者： Ming XU Xin YU Jing ni school of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

With increasing environmental concerns,the substitution of mineral oil-based cutting fluid has become an urgent *** vegetable soybean oil as base fluid,nanofluid cutting fluids(NFCFs)were prepared by adding different weight concentrations of nanographite particles(NGPs),and their penetration and lubrication performances were studied.A novel simulated tool-chip slit with micrometersized geometry was manufactured to evaluate and quantify the penetration rate of the NFCFs by image analysis ***,a large number of comparative experiments on the closed-type broaching machine were carried out to compare the performance of the proposed NFCFs and a commercial cutting fluid in terms of cutting force,workpiece surface roughness,and metal *** is found that there is an optimal NGP concentration in NFCF for practical cutting *** the concentration of NGP is 0.4 wt%,the broaching process lubrication exhibits an ideal mixed lubricate state,resulting in minimal friction resistance,and thus,both the cutting force and chip curling angle reach their corresponding best ***,the proposed NGP-based vegetable-oil cutting fluid exhibits excellent environmentfriendliness and low-cost consumption in the minimal quantity lubrication(MQL)method;this demonstrates its potential for replacing the traditional broaching cutting fluid.

关键词： cutting fluid vegetable oil nano-graphite particle penetration broaching

An Adaptive Collocation Method with Weighted Extended PHT-splines

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Journal of systems science & Complexity 2021年第1期34卷 47-67页

作者： ni Qian DENG Jiansong WANG Xuhui school of Mathematical sciences University of Science and Technology of ChinaHefei 230026China school of Mathematics Hefei University of TechnologyHefei 230009China

This paper presents an adaptive collocation method with weighted extended *** authors modify the classification rules for basis functions based on the relation between the basis vertices and the computational domain. The Gaussian points are chosen to be collocation points since PHT-splines are C1 continuous. The authors also provide relocation techniques to resolve the mismatch problem between the number of basis functions and the number of interpolation conditions. Compared to the traditional Greville collocation method, the new approach has improved accuracy with fewer oscillations. several numerical examples are also provided to test our the proposed approach.

关键词： Collocation method Gaussian points PHT-splines weighted extended PHT-splines