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Experimental study on high-efficiency polishing for potassium dihydrogen phosphate (KDP) crystal by using two-phase air-water fluid

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Frontiers of Mechanical Engineering 2020年第2期15卷 294-302页

作者： ziyuan liu Hang GAO Dongming GUO Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China

A high-efficiency polishing approach using two-phase air–water fluid(TAWF)is proposed to avoid surface contamination and solve the inefficiency of previous water-dissolution polishing techniques for potassium dihydrogen phosphate(KDP)*** the proposed method,controllable deliquescence is implemented without any chemical *** product of deliquescence is then removed by a polishing pad to achieve surface *** mechanism underlying TAWF polishing is analyzed,a special device is built to polish the KDP crystal,and the effect of relative humidity(RH)on polishing performance is *** relationship between key parameters of polishing and surface planarization is also *** show that the polishing performance is improved with increasing ***,precisely controlling the RH is extremely difficult during TAWF *** deliquescence can easily be disrupted once the RH fluctuates,which therefore needs to be restricted to a low level to avoid its influence on deliquescence *** material removal of TAWF polishing is mainly attributed to the synergistic effect of deliquescence and the polishing *** polishing pressure and revolution rate remarkably reduce the life of the polishing pad and the surface quality of the KDP *** polishing using IC-1000 and TEC-168S increase the machining efficiency by 150%,and a smooth surface with a root mean square surface roughness of 5.5 nm is obtained.

关键词： potassium dihydrogen phosphate(KDP)crystal controllable deliquescence two-phase air–water fluid high-efficiency polishing material removal

Designing two-dimensional ferroelectric materials from phosphorus-analogue structures

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Nano Research 2023年第4期16卷 5834-5842页

作者： ziyuan liu Lei Tao Yan-Fang Zhang Jinbo Pan Shixuan Du Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation Beijing 100190China

Two-dimensional(2D)ferroelectric(FE)materials with relatively low switching barrier and large polarization are promising candidates for next-generation miniaturized nonvolatile memory ***,we screen out 39 new 2D ferroelectric materials,MX(M:Group III-V elements;X:Group V-VII elements),in three phosphorus-analogue phases including black phosphorene-likeα-phase,blue phosphorus-likeβ-phase,and GeSe-likeγ-phase using high-throughput *** materials(α-SbP,γ-AsP,etc.)exhibit FE switching barriers lower than 0.3 eV/f.u.,ferroelectric polarization larger than 2×10^(−10)C/m,and high thermodynamic stability with energy above hull smaller than 0.2 eV/*** find that the larger the electronegativity difference between M and X,the larger the ferroelectric ***,larger electronegativity differences result in lower in-plane piezoelectric stress tensor(e11)for MX consisting of Group IV and VI elements and larger e11 for those consisting of Group V *** calculations predict a giant tunneling electroresistance in ferroelectric tunnel junctionα-Sb(Sn)P/α-SbP/α-Sb(Te)P(1.26×104%)and large piezoelectric strain coefficient inα-SnTe(396 pm/V),providing great opportunities to the design of non-volatile resistive memories,and high-performance piezoelectric devices.

关键词： two-dimensional(2D)materials ferroelectricity piezoelectricity ferroelectric tunnel junction

Effect of Intermolecular Interaction on Stability of Asphaltene-Hydrogen Donor System

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China Petroleum Processing & Petrochemical Technology 2022年第4期24卷 21-28页

作者： Sun Yudong Li Maolin liu ziyuan Xiao Shengyu College of Chemical Engineering China University of PetroleumQingdao 266580China

The stability of three asphaltene-hydrogen donor systems,namely asphaltene-1-methylnaphthalene,asphaltene-tetralin,and asphaltene-decalin,with a mass ratio of 1:10 was investigated using the Turbiscan stability *** interactions between hydrogen donor molecules and asphaltene units were simulated and calculated using Gaussian and Multiwfn,and then,noncovalent interaction analysis was *** results showed that the stability of the three asphaltene-hydrogen donor systems decreased as follows:asphaltene-1-methylnaphthalene>asphaltene-tetralin>*** stability differences among the three systems were due to the different interactions between the hydrogen donor molecules and the asphaltene *** T-stacking interaction strength between the hydrogen donor molecules and the asphaltene units decreased as follows:1-methylnaphthalene-asphaltene unit>tetralin-asphaltene unit>decalin-asphaltene *** analysis indicates that the T-stacking interactions between the hydrogen donor molecules and the asphaltene units were mainly van der Waals forces,and the proportions of hydrogen bonds in the weak interaction differed among the systems.

关键词： asphaltene-hydrogen donor system stability interaction gaussian NCI analysis

Analysis of Influence Factors for FCC Slurry Separation by Mixed Solvent Extraction

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China Petroleum Processing & Petrochemical Technology 2022年第1期24卷 111-116页

作者： Sun Yudong Zhao Xiaoning liu ziyuan Feng Yi Han Zhongxiang College of Chemical Engineering China University of Petroleum(East China)Qingdao 266580

Daqing FCC slurry was treated using mixed solvent containing N,N-dimethylformamide(extraction solvent)and n-paraffin(stripping-agent).The influence of solvent formulation(ratio of DMF/stripping-agent),temperature,time and solvent-oil ratio on yield and aromatics content of the extract oil were analyzed by a four-factor and three-level orthogonal experimental *** polynomial regression models between the extract oil yield and aromatics content with the four factors were *** surface analysis showed that solvent formulation,temperature and solvent-oil ratio have significant effects on extraction result and there is an interaction between temperature and solvent-oil ratio on aromatics content,when the FCC slurry is extracted by mixed ***,the extraction time has no significant *** optimal conditions for FCC slurry extraction covered:a solvent mixed ratio of 2.3,a temperature of 62.8℃,a solvent-oil ratio of 3.2,and a time of 35 *** result of verification experiment was in good agreement with the prediction of the model.

关键词： solvent formulation FCC slurry extraction response surface method extract oil yield aromatics content

Computation Tree Logic Model Checking of Multi-Agent Systems Based on Fuzzy Epistemic Interpreted Systems

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Computers, Materials & Continua 2024年第3期78卷 4129-4152页

作者： Xia Li Zhanyou Ma Zhibao Mian ziyuan liu Ruiqi Huang Nana He School of Computer Science and Engineering North Minzu UniversityYinchuan750000China School of Computer Science FoSEThe University of HullHullUK

Model checking is an automated formal verification method to verify whether epistemic multi-agent systems adhere to property *** there is an extensive literature on qualitative properties such as safety and liveness,there is still a lack of quantitative and uncertain property verifications for these *** uncertain environments,agents must make judicious decisions based on subjective *** verify epistemic and measurable properties in multi-agent systems,this paper extends fuzzy computation tree logic by introducing epistemic modalities and proposing a new Fuzzy Computation Tree Logic of Knowledge(FCTLK).We represent fuzzy multi-agent systems as distributed knowledge bases with fuzzy epistemic interpreted *** addition,we provide a transformation algorithm from fuzzy epistemic interpreted systems to fuzzy Kripke structures,as well as transformation rules from FCTLK formulas to Fuzzy Computation Tree Logic(FCTL)***,we transform the FCTLK model checking problem into the FCTL model *** enables the verification of FCTLK formulas by using the fuzzy model checking algorithm of FCTL without additional computational ***,we present correctness proofs and complexity analyses of the proposed ***,we further illustrate the practical application of our approach through an example of a train control system.

关键词： Model checking multi-agent systems fuzzy epistemic interpreted systems fuzzy computation tree logic transformation algorithm

A comparison of ophthalmic education in China and America

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Annals of Eye Science 2017年第1期2卷 165-170页

作者： ziyuan liu Mugen liu Robert Chang Ping Huang Chun Zhang Department of Ophthalmology Peking University Third HospitalPeking UniversityBeijing 100191China Department of Ophthalmology UT Southwestern Medical CenterTX 75209USA Stanford Byers Eye institute Palo AltoCA 94303USA Doheny Eye Institute UCLALos AngelesCA 90033USA

Training qualified ophthalmic professional is crucial for any eye care system *** of modern western Ophthalmology in China started late but develops *** review focused on ophthalmic education in China and US,describing details of the programs and analyzing the *** summary may provide useful information for practitioners of medical education from both countries and help improve the present training designs.

关键词： Ophthalmic education standardized ophthalmology residency training continuing medical education(CME)

An Application of RGBD-Based Skeleton Reconstruction for Pedestrian Detection and Occlusion Handling

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Journal of Computer and Communications 2024年第1期12卷 147-161页

作者： ziyuan liu James Watt School of Engineering University of Glasgow Glasgow UK

This study explores the challenges posed by pedestrian detection and occlusion in AR applications, employing a novel approach that utilizes RGB-D-based skeleton reconstruction to reduce the overhead of classical pedestrian detection algorithms during training. Furthermore, it is dedicated to addressing occlusion issues in pedestrian detection by using Azure Kinect for body tracking and integrating a robust occlusion management algorithm, significantly enhancing detection efficiency. In experiments, an average latency of 204 milliseconds was measured, and the detection accuracy reached an outstanding level of 97%. Additionally, this approach has been successfully applied in creating a simple yet captivating augmented reality game, demonstrating the practical application of the algorithm.

关键词： AR Pedestrian Detection Occlusion Management RGB-D Azure Kinect Unity

Modification of LiMn_(0.6)Fe_(0.4)PO_(4)lithium-ion battery cathode materials with a fluorine-doped carbon coating

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Particuology 2024年第9期92卷 278-287页

作者： Debao Pan ziyuan liu Chengping Li Rundong Wan Jinsong Wang Jiangzhao Chen Ding Wang Jinkun liu Yingjie Zhang Jianhong Yi Rui Bao Zhengfu Zhang Peng Dong Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China

In this study,glucose and NH4F were utilized as sources of carbon and fluorine,respectively,for the synthesis of LiMn_(0.6)Fe_(0.4)PO_(4)(LMFP)*** nanoscales were subsequently modified with varying levels of fluorine-doped carbon through co-precipitation and mechanical ball milling *** LMFP,incorporating carbon and varying levels of fluoride ions,exhibit higher specific discharge capacities at 0.2 Cand electrochemical characteristics compared to the original LMFP coated solely with *** inclusion of fluorine-doped carbon in the composite material creates numerous pathways for expeditious electron ***,the partial formation of metal fluoride at the interface between the surface of LMFP and the layer of carbon coating doped with fluorine enhances the reduction in the charge-transfer *** modified ferromanganese phosphate cathode material reveals an outstanding discharge capacity displaying a reversible discharge specific capacity value of 131.73 mA h g^(−1)at 10C and 154.6 mA h g^(−1)at 0.2C,due to its unique structure.

关键词： Lithium manganese iron phosphate Anode Electrochemical Fluorine-doped carbon

SPACE CHEMISTRY RESEARCHES IN CHINA DURING 2000-2001

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空间科学学报 2002年第Z1期22卷 120-128页

作者： ZOU Yongliao LIN Yangting LI Chunlai liu Jianzhong OUYANG ziyuan XU Lin National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012P. R. China Institute of Geochemistry The Chinese Academy of Sciences P.R. China Guangzhou Institute of Geochemistry The Chinese Academy of Sciences P.R. China National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012P. R. China National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012P. R. China Institute of Geochemistry The Chinese Academy of Sciences P.R. China National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012P. R. China Institute of Geochemistry The Chinese Academy of Sciences P.R. China

Over the past two years, significant progress in space chemistry has been made in China. The research fields include meteorites, pre-solar materials, science researches of the moon, effects of the space debris on space environment, and heterogeneity of the Earth. Chinese Lunar Exploration Project Some studies are also dedicated to one important space mission "Chinese Lunar Exploration Project". In this paper, the main achievements are outlined, and some concepts and hypotheses are briefly revised.

关键词： Space chemistry, Meteorite, Solar system, Earth, Lunar explo ration