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A Calculation Method for Incidence and Reflection of Irregular Waves Along Seawalls

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China Ocean Engineering 1997年第3期12卷 305-314页

作者： Zhu, LS sui, SF Chinese Acad Sci S China Sea Inst Oceanol Guangzhou 510301 Peoples R China

Some researches have been made in this aspect. In the method by Walton Jr.(1992), incident waves are supposed to be the overlapping result of M component waves with different frequencies which may take different directions, the direction of incident waves should be available in advance, but in fact the direction of incident waves is not available. In our study, incident waves are supposed to be composed of M overlapping component waves with different frequencies, and different frequencies have different directions. Based on the irregular wave reflection theory, the calculation formulas of wave direction, complex amplitude of incident waves, and complex amplitude of reflected waves in surface which are composed of component waves are derived by means of discrete Fourier transform. Then, the frequency spectra of incident waves and reflected waves and the reflection coefficient of waves with corresponding frequencies are obtained. Verification of the method and the calculation results from in-situ measured data indicate that the method is reliable and highly accurate.

关键词： irregular wave seawall incidence and reflection calculation method

A review on the application of nanofluids in enhanced oil recovery

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Frontiers of Chemical Science and Engineering 2022年第8期16卷 1165-1197页

作者： Jinjian Hou Jinze Du Hong sui Lingyu Sun School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China National Engineering Research Centre of Distillation Technology Tianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China

Enhanced oil recovery(EOR)has been widely used to recover residual oil after the primary or secondary oil recovery *** to conventional methods,chemical EOR has demonstrated high oil recovery and low operational *** have received extensive attention owing to their advantages of low cost,high oil recovery,and wide *** recent years,nanofluids have been widely used in EOR ***,several studies have focused on the role of nanofluids in the nanofluid EOR(N-EOR)***,the mechanisms related to N-EOR are unclear,and several of the mechanisms established are chaotic and *** review was conducted by considering heavy oil molecules/particle/surface micromechanics;nanofluidassisted EOR methods;multiscale,multiphase pore/core displacement experiments;and multiphase flow fluid-solid coupling *** can alter the wettability of minerals(particle/surface micromechanics),oil/water interfacial tension(heavy oil molecules/water micromechanics),and structural disjoining pressure(heavy oil molecules/particle/surface micromechanics).They can also cause viscosity reduction(micromechanics of heavy oil molecules).Nanofoam technology,nanoemulsion technology,and injected fluids were used during the EOR *** mechanism of N-EOR is based on the nanoparticle adsorption *** can be adsorbed on mineral surfaces and alter the wettability of minerals from oil-wet to water-wet *** can also be adsorbed on the oil/water surface,which alters the oil/water interfacial tension,resulting in the formation of *** are also adsorbed on the surface of nanoparticles,which reduces the asphaltene content in heavy oil,resulting in a decrease in the viscosity of oil,which helps in oil *** previous studies,most researchers only focused on the results,and the nanoparticle adsorption properties have been *** review presents the relationship between th

关键词： nanofluid EOR mechanism nanoparticle adsorption interface property internal property

Multiphysical contact of functionally graded magneto-electroelastic material with imperfect bonding interface

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Friction 2024年第4期12卷 632-654页

作者： Yijin sui Haibo ZHANG Jieliang ZHAO Wenzhong WANG School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

Three-dimensional(3D)frictional contact model of functionally graded magneto-electro-elastic(FGMEE)material with a conducting spherical punch under electromagnetic fields is *** types of imperfect bonding interface of layers,dislocation-like interface and force-like interface,are *** response functions(FRFs)for multilayered MEE material with imperfect interface subjected to unit mechanical,electric,and magnetic loads are *** FRFs are used with the semi-analytical method(SAM)to solve present multiphysical contact *** present model is verified by comparing with literatures and the finite element method(FEM)and used to study the contact problem of FGMEE film imperfectly bonded on homogenous MEE half-space under electromagnetic *** studies are conducted to reveal the effects of imperfect interfaces and also film properties including gradient index and thickness.

关键词： frictional contact magneto-electro-elastic material imperfect interface functionally graded electromagnetic fields

Creating super-tough and strong PA6/ABS blends using multi-phase compatibilizers

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Chinese Chemical Letters 2019年第1期30卷 149-152页

作者： Xianwei sui Xu-Ming Xie Key Laboratory of Advanced Materials (MOE) Department of Chemical Engineering Tsinghua University

Polyamide/acrylonitrile-butadiene-styrene copolymer(PA/ABS) blends have drawn considerable attention from both academia and industry for their important applications in automotive and electronic areas. Due to poor miscibility of PA and ABS, developing an effective compatibilization strategy has been an urgent challenge to achieve prominent mechanical properties. In this study, we create a set of mechanically enhanced PA6/ABS blends using two multi-monomer melt-grafted compatibilizers, SEBSg-(MAH-co-St) and ABS-g-(MAH-co-St). The dispersed domain size is significantly decreased and meanwhile the unique "soft shell-encapsulating-hard core" structures form in the presence of compatibilizers. The optimum mechanical performances manifest an increase of 36% in tensile strength and an increase of 1300% in impact strength, compared with the neat PA6/ABS binary blend.

关键词： Melt blending Multi-phase compatibilizer Morphology Tensile properties Super-tough

Non-convex optimization for inverse problem solving in computer-generated holography

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Light(Science & Applications) 2024年第8期13卷 1464-1486页

作者： Xiaomeng sui Zehao He Daping Chu Liangcai Cao Department of Precision Instruments Tsinghua UniversityBeijing 100084China Department of Engineering Centre for Photonic Devices and SensorsUniversity of Cambridge9 JJ Thomson AvenueCambridge CB30FAUK Cambridge University Nanjing Centre of Technology and Innovation 23 Rongyue RoadJiangbei New AreaNanjing 210000China

Computer-generated holography is a promising technique that modulates user-defined wavefronts with digital *** appropriate holograms with faithful reconstructions is not only a problem closely related to the fundamental basis of holography but also a long-standing challenge for researchers in general fields of *** the exact solution of a desired hologram to reconstruct an accurate target object constitutes an ill-posed inverse *** general practice of single-diffraction computation for synthesizing holograms can only provide an approximate answer,which is subject to limitations in numerical *** non-convex optimization algorithms are thus designed to seek an optimal solution by introducing different constraints,frameworks,and ***,we overview the optimization algorithms applied to computer-generated holography,incorporating principles of hologram synthesis based on alternative projections and gradient descent *** is aimed to provide an underlying basis for optimized hologram generation,as well as insights into the cuttingedge developments of this rapidly evolving field for potential applications in virtual reality,augmented reality,head-up display,data encryption,laser fabrication,and metasurface design.

关键词： optimization convex inverse

High-purity Mg and Mg-1Ca alloys:Comparative assessment of the merits regarding degradation,osteogenesis,and biosafety for orthopedic applications

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Journal of Materials Science & Technology 2023年第9期140卷 58-66页

作者： Baiyan sui Hua Lu Xin Liu Jiao Sun Department of Dental Materials Shanghai Biomaterials Research and Testing CenterShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Center for StomatologyNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of StomatologyShanghai 200011China

High-purity magnesium(HP Mg)and Mg-1Ca,as representations of Mg-matrix implants produced by purifying and alloying,are employed in biomedical applications primarily because of their bioactivity and *** superiority of both degradation properties,the match between degradation and osteo-genesis in vivo,and biosafety are critical problems that will decide future purifying or alloying to construct Mg-based implants and promote clinical *** present study investigated the benefits and limitations of degradation behavior and biosafety of HP Mg and Mg-1Ca according to the electro-chemical experiment,hydrogen evolution test,immersion test,and in vivo bone implantation *** results indicated that due to its Mg 2 Ca phase,Mg-1Ca exhibited a considerably higher corrosion current density and hydrogen production than HP Mg in ***,HP Mg and Mg-1Ca display a favorable match between their degradation and the surrounding osteogenesis,resulting in no significant variation in degradation in vivo during 26 ***,the implantation and degradation of HP Mg and Mg-1Ca do not result in major organ dysfunction or pathological *** work is expected to lay the foundation for future clinical translation of Mg and Mg alloy orthopedic implants.

关键词： High-purity magnesium Mg-1Ca Microstructure Degradation in vitro and vivo Biosafety

Analysis on hot deformation and following cooling technology of 25Cr2Ni4MoVA steel

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Journal of Iron and Steel Research International 2021年第10期28卷 1305-1314页

作者： Jie Yang Zong-hui Su Feng-li sui School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina

The true stress–true strain curves of 25Cr2Ni4MoVA steel were obtained by uniaxial compression experiments at 850–1200℃ in the strain rate range of 0.001–10.0 s^(−1).And the dynamic continuous cooling transformation curves were obtained at the cooling rate range of 0.5–15.0℃ s^(−1) from the austenitization temperature of 1000℃ to the room temperature by pre-strain of 0.2 as *** power dissipation map and the dynamic continuous cooling transformation diagram were constructed based on the data provided by these *** with the optical micrographs of the compressed samples,the full dynamic recrystallization region is located between 1000 and 1200℃ and at the strain rate range from 0.01 to 10.0 s^(−1) with the power dissipation efficiency not less than *** the full dynamic recrystallization region,the power dissipation efficiency increases and the dynamic recrystallization activation energy decreases with the temperature *** the strain rate decreasing,the power dissipation efficiency increases firstly and then starts to decrease as the strain rate is less than 0.1 s^(−1),and dynamic recrystallization activation energy changes on the *** to the dynamic continuous cooling transformation diagram,slow cooling is a better way for the hot-deformed piece with large size or complex shape to avoid cracking as the temperature of the piece is lower than 400℃,and different cooling ways can be used for the hot-deformed piece with small size and simple shapes to obtain certain microstructure and meet good compressive properties.

关键词： 25Cr2Ni4MoVA steel Power dissipation map Dynamic continuous cooling transformation diagram Hot deformation Cooling rate

Study on the evolution of solid–liquid–gas in multi-scale pore methane in tectonic coal

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Chinese Journal of Chemical Engineering 2024年第7期71卷 122-131页

作者： Junjie Cai Xijian Li Hao sui Honggao Xie College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China Mining College Guizhou UniversityGuiyang 550025China

The rich accumulation of methane(CH_(4))in tectonic coal layers poses a significant obstacle to the safe and efficient extraction of coal seams and coalbed *** coal samples from three geologically complex regions were selected,and the main results obtained by using a variety of research tools,such as physical tests,theoretical analyses,and numerical simulations,are as follows:22.4–62.5 nm is the joint segment of pore volume,and 26.7–100.7 nm is the joint segment of pore specific surface *** the dynamic gas production process of tectonic coal pore structure,the adsorption method of methane molecules is“solid–liquid adsorption is the mainstay,and solid–gas adsorption coexists”.Methane stored in micropores with a pore size smaller than the jointed range is defined as solid-state *** within the jointed range,which transition from micropore filling to surface adsorption,are defined as gaseous *** outside the jointed range,where solid–liquid adsorption occurs,are defined as liquid *** evolution of pore structure affects the methane adsorption mode,which provides basic theoretical guidance for the development of coal seam resources.

关键词： Tectonic coal Multiscale pore structure Methane adsorption Micropore filling Monolayer Molecular simulation

Roles of histone ubiquitylation in DNA damage signaling

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Frontiers in Biology 2011年第5期6卷 390-397页

作者： sui-sui DONG Michael S.Y.HUEN Genome Stability Research Laboratory Department of AnatomyCentre for Cancer ResearchUniversity of Hong KongHong KongChina

Histone ubiquitylation has emerged as an important chromatin modification associated with DNA damage signaling and repair *** histone marks,laid down by E3 ubiquitin ligases that include RNF8 and RNF168,decorate chromatin domains surrounding DNA double-strand breaks(DSBs).Recent work implicated ubiquitylated histones in orchestrating cell cycle checkpoints,DNA repair and gene *** we summarize recent advances that contribute to our current knowledge of the highly dynamic nature of DSB-associated histone ubiquitylation,and discuss major challenges ahead in understanding the versatility of ubiquitin conjugation in maintaining genome stability.

关键词： DNA damage histone ubiquitylation ubiquitin ligase RNF8 RNF168