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Numerical simulations of sloshing and suppressing sloshing using the optimization technology method

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Applied Mathematics and Mechanics(English Edition) 2018年第6期39卷 845-854页

作者： hui guan Yifei XUE Zhiiun WEI Chuijie WU College of Meteorology and Oceanography National University of Defense Technology Nanjing 211101 China School of Aerospace Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Structural Analysis for Industrial Equipment School of Aeronautics and Astronautics Dalian University of Technology Dalian 116024 Liaoning Province China School of Aeronautics and Astronautics Dalian University of Technology Dalian 116024 Liaoning Province China

Sloshing is a common phenomenon in nature and industry, and it is important in many fields, such as marine engineering and aerospace engineering. To reduce the sloshing load on the side walls, the topology optimization and optimal control methods are used to design the shape of the board, which is fixed in the middle of the tank. The results show that the new board shape, which is designed via topology optimization, can significantly reduce the sloshing load on the side wall.

关键词： sloshing volume of fluid (VOF) method suppressing sloshing topologyoptimization

Numerical analysis of the interaction of 3D compressible bubble clusters

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Applied Mathematics and Mechanics(English Edition) 2019年第8期40卷 1181-1196页

作者： hui guan Jincheng WANG Zhijun WEI Chuijie WU College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China School of Aeronautics and Astronautics Dalian University of TechnologyDalian 116024Liaoning ProvinceChina State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024Liaoning ProvinceChina

Based on the bubble dynamic theory and the compressible two-phase flow solver of the open source software OpenFOAM, a numerical simulation study is carried out on the interactions of bubble clusters in a closed volume. The bubble dynamics and interactions of a single bubble, two bubbles, and four bubbles are investigated under the working conditions without and with the presence of a free surface. Through a parametric study, the qualitative patterns of the variations of the bubble collapse period, the volume compressibility, the bubble pressure peak value, and the breakdown, fusion, and separation phenomena with the parameters such as the bubble pressure, the radius size, the bubble spacing, and the distance from the free surface are obtained. The main factors affecting the bubble morphology and the dynamic characteristics are summarized from numerous parameter experiments. It is shown that, in the absence of a free surface, the main factors are the relative size of the bubbles, the pressure of the liquid, and the pressure differences among the bubbles, while in the presence of a free surface, the main factor is the pressure of the liquid between the upper surface of the bubble and the free surface.

关键词： compressible two-phase flow interaction of bubbles OpenFOAM

Palladium-catalyzed 3,4-hydroaminocarbonylation of conjugated dienes for formation ofβ,γ-unsaturated amides

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Science China Chemistry 2023年第5期66卷 1474-1481页

作者： hui-Yi Yang Liang-Quan Lin Na-Qi Li Zhi-hui Ren Zheng-hui guan Key Laboratory of Synthetic and Nature Molecule of Ministry of Education Department of Chemistry&Materials ScienceNorthwest UniversityXi’an 710127China

Hydrocarbonylation of conjugated dienes is one of the most promising yet challenging methods for the synthesis of carbonyl ***,we reported the development of an unprecedented palladium-catalyzed branched selective 3,4-hydroaminocarbonylation of 1,3-dienes with CO and amines hydrochloride to affordβ,γ-unsaturated *** reaction employs readily available starting materials(including anilines,amines,amino acids,peptides,aryl-1,3-dienes,alyl-1,3-dienes)and tolerates a wide range of functional groups,thus providing a facile and effective approach to access a diverse array ofα-substitutedβ,γ-unsaturated *** investigations suggested that the hydropalladation of dienes is irreversible,and the insertion of CO into the allyl-Pd species is probably the rate-limiting step.

关键词： palladium-catalyzed carbonylation reaction regioselectivity conjugated diene amides synthesis

Asymmetric neutron stars in the presence of vacuum fluctuations

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Nuclear Science and Techniques 2016年第1期27卷 111-116页

作者： Hong-hui guan Chen Wu Ji-Feng Yang Department of Physics East China Normal University Shanghai Institute of Applied Physics Chinese Academy of Sciences Kavli Institute for Theoretical Physics China Chinese Academy of Sciences

The asymmetric neutron stars are investigated in a relativistic effective model with vacuum fluctuations(VF) taken into account. Due to the VF effects, various properties of the neutron matter become ‘softened' comparing to that obtained in the FSUGold model, and the maximum mass of the enpelT neutron stars is reduced from1.71 M to 1:35M.

关键词：真空涨落中子星非对称中子物质最大质量相对论不对称 COM

A review of isolation methods, structure features and bioactivities of polysaccharides from Dendrobium species

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Chinese Journal of Natural Medicines 2020年第1期18卷 1-27页

作者： yue Han ZENG hui DING Kan Glycochemistry and Glycobiology Lab Key Laboratoty of Receptor ResearchShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China University of Chinese Academy of Sciences Beijing 100049China

Dendrobium,orchid,is a traditional Chinese herb medicine applied extensively as tonic and precious food for thousands of years recorded in ancient Chinese medical book"Shen Nong’s Materia Medica".It’s well known that bioactivities are usually related to the ingredients’*** on the previous research,Dendrobium species contain amino acid,sesquiterpenoids,alkaloids and *** the bioactive substances,carbohydrate shows extensive activities in antitumor,antiglycation,immune-enhancing,antivirus,antioxidant,antitumor and ***,as the main biologically active substance,the exact structures and latent activities of polysaccharides from Dendrobium species are widely focused *** this review,we focus on the advancements of extraction methods and diversity of structures and bioactivities of polysaccharides obtained from Dendrobium species.

关键词： Dendrobium Polysaccharides Bioactivities Structures

Simultaneous determination of 14 active constituents of Shengjiang Xiexin decoction using ultrafast liquid chromatography coupled with electrospray ionization tandem mass spectrometry

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Acta Pharmaceutica Sinica B 2017年第2期7卷 193-201页

作者： Gang Peng Huanyu guan Xiaoming Wang yue Shi Institute of Medicinal Plant Development Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100193China

An effective herbal medicinal prescription of Shengjiang Xiexin decoction(SXD) was used in treating the inflammatory bowel disease in *** this study,an ultrafast liquid chromatography-tandem mass spectrometry(UFLC-MS/MS) method was developed to separate and to simultaneously determine14 major active ingredients in *** separation was successfully accomplished on an Acquity BEH C18(100 mm × 2.1 mm,1.7 μm) column using gradient elution with 0.1%(v/v) formic acid water(A) and 0.1%(v/v) formic acid in methanol(B).Negative and positive electrospray ionization tandem mass spectrometry was used to detect the 14 analytes using its selective reaction monitoring(SRM) mode.A good linear regression relationship for each analyte was obtained over the range from3.88 ng/mL to 4080 ng/*** precision was evaluated by intra-and inter-day assays with a relative standard deviation(RSD) of less than 6.25%.The recovery measured at three concentration levels varied from 98.72%to 103.47%.The overall limits of quantification(LOQ) ranged from 2.05 ng/mL to4.72 ng/*** method was successfully implemented in the qualitative and quantitative analyses of the14 chemical constituents in *** results showed that the developed UFLC-MS/MS method was linear and *** method could be used reliably as a quality control method for SXD.

关键词： Inflammatory bowel disease Quality control UFLC–MS/MS Determination Shengjiang Xiexin decoction

Accurate and Robust Eye Center Localization via Fully Convolutional Networks

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IEEE/CAA Journal of Automatica Sinica 2019年第5期6卷 1127-1138页

作者： Yifan Xia hui Yu Fei-yue Wang the School of Creative Technologies University of PortsmouthPortsmouthPO1 2DJUK the State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China

Eye center localization is one of the most crucial and basic requirements for some human-computer interaction applications such as eye gaze estimation and eye tracking. There is a large body of works on this topic in recent years, but the accuracy still needs to be improved due to challenges in appearance such as the high variability of shapes, lighting conditions, viewing angles and possible occlusions. To address these problems and limitations, we propose a novel approach in this paper for the eye center localization with a fully convolutional network(FCN),which is an end-to-end and pixels-to-pixels network and can locate the eye center accurately. The key idea is to apply the FCN from the object semantic segmentation task to the eye center localization task since the problem of eye center localization can be regarded as a special semantic segmentation problem. We adapt contemporary FCN into a shallow structure with a large kernel convolutional block and transfer their performance from semantic segmentation to the eye center localization task by *** experiments show that the proposed method outperforms the state-of-the-art methods in both accuracy and reliability of eye center localization. The proposed method has achieved a large performance improvement on the most challenging database and it thus provides a promising solution to some challenging applications.

关键词： Deep learning eye center localization eye gaze estimation eye tracking fully convolutional network (FCN) humancomputer interaction

Effect of substrate materials on rutile crystalline orientation in plasma-sprayed TiO2 coatings

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 62-66页

作者： YANG guan-jun LI Chang-jiu WANG Yu-yue State Key Laboratory for Mechanical Behavior of Materials Xi''an Jiaotong University Xi''an 710049 China State Key Laboratory for Mechanical Behavior of Materials Xi''an Jiaotong University Xi''an 710049 China State Key Laboratory for Mechanical Behavior of Materials Xi''an Jiaotong University Xi''an 710049 China

TiO2 coatings are of technical importance owing to their promising applications to photocatalytical, electrical, optical and tribological coatings. Thermal spraying process has been widely used to deposit both metallic and nonmetallic coatings. During thermal spraying, spray particle at fully or partially melted condition is projected to a substrate and subsequently flattens, rapidly cools and solidifies. Therefore, a coating in lamellar structure is usually formed as a quenched microstructure. TiO2 coatings were deposited on different substrates through plasma spraying with fused-crushed powder in rutile phase as feedstock to reveal the crystalline orientation in the coatings. XRD results show that the coatings consist of rutile phase with a fraction of anatase phase, and the rutile phase presents a preferable crystalline orientation along [101] direction. It is found that the orientation factors of rutile phase in the thin coatings are significantly influenced by substrate materials. The thick coatings yield the same orientation factors of 0.22 to 0.23 on all substrates in spite of substrate materials. It is considered that the thermal properties of substrate materials are the dominant factors for the preferable crystalline orientation in rutile phase within plasmasprayed TiO2 coating.

关键词： titanium oxide thermal spray coatings rutile orientation

Diesel molecular composition and blending modeling based on SUBEM framework

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Petroleum Science 2022年第2期19卷 839-847页

作者： yue-Ming guan Dong guan Cheng Zhang Sheng-Hua Yuan guang-Qing Cai Lin-Zhou Zhang State Key Laboratory of Heavy Oil Processing Petroleum Molecular Engineering Center(PMEC)China University of PetroleumBeijing102249China SINOPEC Dalian Research Institute of Petroleum and Petrochemicals SINOPECDalian116045LiaoningChina

Diesel molecular compositional model has important application for diesel quality prediction,blending,and molecular-level process model *** this paper,different types of diesel molecular compositional and blending models were constructed based on the SU-BEM *** than 1500 representative molecules were selected to form the molecular structure *** probability density functions(PDFs)combination was determined by experimental data and experience.A quadratic optimization strategy combining genetic algorithm with local optimization algorithm was adopted to improve the accuracy of the compositional *** model results show good agreement with the experimental *** diesel blending model was constructed at the molecular-level based on the above diesel compositional *** properties of the blending model accord with the experimental *** is proved that the compositional models and blending model constructed have high accuracy and strong prediction capability,and are applicable to the industrial process.

关键词： Molecular compositional model Molecular blending model SU-BEM Framework Diesel