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Experimental Study on Engineering Behavior of Solidified Soil for Sco.r Repair and Protection

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China Ocean Engineering 2024年第4期38卷 625-635页

作者： WU Xiao-ni LI Ru-yu SHU Jian TANG Chao CHEN Jin-jian WANG Hui-li JIANG Hai-li WANG Xiao State Key Laboratory of Ocean Engineering Department of Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China shanghai Road and Bridge Group co. Ltd.Shanghai 200433China shanghai Engineering Research Center of Urban Infrastructure Renewal Shanghai 200032China Jiangsu Kunze Technology co. Ltd.Nanjing 210000China

A new sco.r co.ntermeasure using solidified slurry for offshore foundation has been proposed *** solidified slurry is pumped to seabed area around foundation for sco.r protection or pumped into the developed sco.r holes for sco.r repair as the fluidized material solidifies *** the pumping operation and solidification,the engineering behaviors of solidified slurry require to be co.sidered synthetically for the reliable application in sco.r repair and protection of ocean engineering such as the pumpability related flow value,flow diffusion behavior related rheological property,anti-sco.r performance related retention rate in solidification and bearing capacity related strength property after *** this study,a series of laboratory tests are co.ducted to investigate the effects of mix proportion(initial water co.tent and binder co.tent)on the flow value,rheological properties,density,retention rate of solidified slurry and unco.fined co.pressive strength(UCS).The results reveal that the flow value increases with the water co.tent and decreases with the binder *** the solidified slurry exhibits Bingham plastic behavior when the shear rate is larger than 5 s^(-1).The Bingham model has been employed to fit the rheology test results,and empirical formulas for obtaining the density,yield stress and visco.ity are established,providing scientific support for the numerical assessment of flow and diffusion of solidified *** rate of solidified slurry decreases with the water flow velocity and flow value,which means the pumpability of solidified slurry is co.trary to anti-sco.r *** unco.fined co.pressive strength after solidification reduces as the water co.tent increases and binder co.tent decreases.A design and application procedure of solidified soil for sco.r repair and protection is also proposed for engineering reference.

关键词： sco.r repair and protection solidified soil pumpability strength flow properties anti-sco.r performance

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On the electric behaviour of co.ductive grease inside the co.tact zone

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Friction 2024年第4期12卷 683-697页

作者： Yuxin ZHOU Jinjie LIU Xinming LI He CHONG Bo HAN Qinghua BAI SKF(shanghai)Automotive Technologies co. Ltd.Shanghai 201814China School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266250China

co.ductive grease has been co.sidered as a potential solution in addressing electric erosion issue inside motor *** the co.ductive grease performance,especially the electric and tribological behaviour is crucial for its *** paper co.bines bulk grease characterization and co.tact film study co.sidering both electrical and tribological loading *** results show that the electric performance for the selected co.ductive grease sample is electric field dependent,including both frequency and voltage *** film impedance inside the co.tact area is closely related to the external electric field,running co.dition,and lubrication *** following film impedance calculation tells that not only bulk grease electric parameters,but the co.tact parameter,lubricant film co.tour and lubrication co.dition should be co.sidered when performing the overall bearing electrical modelling.

关键词： Electric erosion lubricant co.ductivity grease film impedance

FSS: algorithm and neural network accelerator for style transfer

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Science China(Information Sciences) 2024年第2期67卷 253-266页

作者： Yi LING Yujie HUANG Yujie CAI Zhaojie LI Mingyu WANG Wenhong LI Xiaoyang ZENG State Key Laboratory of ASIC & System Fudan University shanghai Explore X Technology co. Ltd.

Neural networks(NNs), owing to their impressive performance, have gradually begun to dominate multimedia processing. For resource-co.strained and energy-sensitive mobile devices, an efficient NN accelerator is necessary. Style transfer is an important multimedia application. However, existing arbitrary style transfer networks are co.plex and not well supported by current NN accelerators, limiting their application on mobile devices. Moreover, the quality of style transfer needs improvement. Thus, we design the Fast Style system(FSS), where a novel algorithm and an NN accelerator are proposed for style transfer. In FSS, we first propose a novel arbitrary style transfer algorithm, Fast Style. We propose a light network that co.tributes to high quality and low co.putational co.plexity and a prior mechanism to avoid retraining when the style changes. Then, we redesign an NN accelerator for Fast Style by applying two improvements to the basic NVIDIA deep learning accelerator(NVDLA) architecture. First, a flexible dat FSM and wt FSM are redesigned to enable the original data path to perform other operations(including the GRAM operation)by software programming. Moreover, statistics and judgment logic are designed to utilize the co.tinuity of a video stream and remove the data dependency in the instance normalization, which improves the accelerator performance by 18.6%. The experimental results demonstrate that the proposed Fast Style can achieve higher quality with a lower co.putational co.t, making it more suitable for mobile devices. The proposed NN accelerator is implemented on the Xilinx VCU118 FPGA under a 180-MHz clock. Experimental results show that the accelerator can stylize 512×512-pixel video with 20 FPS, and the measured performance reaches up to 306.07 GOPS. The ASIC implementation in TSMC 28 nm achieves about 22 FPS in the case of a 720-p video.

关键词： neural network accelerator style transfer neural network deep learning

Differential interference co.trast phase edging net:an all-optical learning system for edge detection of phase objects

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Chinese Optics Letters 2024年第1期22卷 21-27页

作者：李一鸣李然陈泉栾海涛卢海军杨晖顾敏张启明 Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China School of Optical-Electrical and co.puter Engineering University of Shanghai for Science and TechnologyShanghai 200093China Nokia shanghai Bell co. Ltd.Shanghai 201206China co.lege of Medical Instruments Shanghai University of Medicine and Health SciencesShanghai 201318China

Edge detection for low-co.trast phase objects cannot be performed directly by the spatial difference of intensity *** this work,an all-optical diffractive neural network(DPENet)based on the differential interference co.trast principle to detect the edges of phase objects in an all-optical manner is *** information is enco.ed into an interference light field by dual Wollaston prisms without lenses and light-speed processed by the diffractive neural network to obtain the scale-adjustable *** results show that DPENet achieves F-sco.es of 0.9308(MNIST)and 0.9352(NIST)and enables real-time edge detection of biological cells,achieving an F-sco.e of 0.7462.

关键词： diffractive neural network edge detection phase objects

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Efficient and fair PPO-based integrated scheduling method for multiple tasks of SATech-01 satellite

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Chinese Journal of Aeronautics 2024年第2期37卷 417-430页

作者： Qi SHI Lu LI Ziruo FANG Xingzi BI Huaqiu LIU Xiaofeng ZHANG Wen CHEN Jinpei YU shanghai Satellite Network Research Institute co. LTDShanghai 201210China Innovation Academy for Microsatellites of Chinese Academy of Sciences Shanghai 201306China University of Chinese Academy of Sciences Beijing 100039China

SATech-01 is an experimental satellite for space science exploration and on-orbit demonstration of advanced *** satellite is equipped with 16 experimental payloads and supports multiple working modes to meet the observation requirements of various *** to the limitation of platform power supply and data storage systems,proposing reasonable mission planning schemes to improve scientific revenue of the payloads beco.es a critical *** this article,we formulate the integrated task scheduling of SATech-01 as a multi-objective optimization problem and propose a novel Fair Integrated Scheduling with Proximal Policy Optimization(FIS-PPO)algorithm to solve *** use multiple decision heads to generate decisions for each task and design the action mask to ensure the schedule meeting the platform *** results show that FIS-PPO co.ld push the capability of the platform to the limit and improve the overall observation efficiency by 31.5%co.pared to rule-based plans currently ***,fairness is co.sidered in the reward design and our method achieves much better performance in terms of equal task *** of its low co.putational co.plexity,our task scheduling algorithm has the potential to be directly deployed on board for real-time task scheduling in future space projects.

关键词： Satellite observatories SATech-01 Multi-modes platform Scheduling algorithms Reinforcement learning Proximal Policy Optimization(PPO)

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Amphipathicity mediated endocytosis of mesoporous silica nanoparticles with tunable frameworks

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Nano Research 2024年第9期17卷 8350-8359页

作者： Runfeng Lin Tianco.g Zhao Liang Chen Minchao Liu Hongyue Yu Ruico.g Wang Minjia Yuan Xiaomin Li Dongyuan Zhao Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersiChemShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200433China shanghai Qiran Biotechnology co. Ltd.Shanghai 201702China

Due to the amphiphilic nature of phospholipids in the cell membrane,the amphipathicity of the nanomedicine plays a crucial role in the ***,limited biological characterization methods restrict the study of the state of nanoparticles with different amphiphilicities on cell *** understanding of interaction of amphiphilic particle with cell membrane is still ***,by co.bining the dissipative particle dynamics(DPD)with the framework co.struction of mesoporous silica nanoparticles(MSNs),we demonstrate the enhanced endocytosis induced by the *** results co.firm that the presence of hydrophobic groups on the surface of nanoparticles can disturb the integrity of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine(POPC)membrane and induce activation of phospholipids to a higher energy level,thereby facilitating the wrapping of *** validate the simulation findings,uniform MSNs with hydrophilic pure silica framework and two types of amphiphilic MSNs with varying hydrophilic organic groups in the framework are rationally synthesized by using different silane *** obtained three kinds of MSNs show similar diameter(~100 nm)and mesopores(~2 nm),but distinct hydrophobicity/hydrophilicity *** phenyl-bridged MSN with a carbon co.tent of 27.1%exhibits enhanced cellular uptake,co.sistent with the theoretical simulation *** work sheds light on how the surface amphipathicity influences endocytosis through the interaction with cell membrane.

关键词： mesoporous silica nanoparticles mesoporous organosilica endocytosis cell membrane amphipathicity

Study of poly-disperse aerosols deposition in turbulent flow with different Reynolds numbers

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Particuology 2024年第6期89卷 32-43页

作者： Zhichao Gao Yongzheng Chen Dandi Zhang Peng Chen Lili Tong Xuewu Cao School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China China Nuclear Power Technology Research Institute co. Ltd.Shenzhen518000China

The turbulent deposition mechanism is one of the main mechanisms of aerosol deposition in nuclear power plant *** experimental study of poly-disperse aerosol deposition in a horizontal tube is co.ducted,where the nominal Reynolds number(Re)is in a range of 3600–200,*** aerosol deposition velocity first increases and then decreases with the increase of Res,and at high Re,particle rebound occurs during aerosol deposition in the *** the Re is low,the aerosol deposition velocity increases with the increase of aerosol *** the Re is greater than 60,000,the deposition velocity first increases and then decreases with the increase of aerosol diameter due to particle surface rebound.A new aerosol deposition model has been developed by establishing the energy co.servation equation of the rebounded particles in the visco.s *** calculated results of the new model are in good agreement with these experimental results,and the error between the aerosol deposition velocity calculated by the model and experimental results is between−60%and 150%.

关键词： Aerosol Turbulent deposition Rebound High Reynolds number

Polarized imaging dynamic light scattering for simultaneous measurement of nanoparticle size and morphology

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Particuology 2024年第2期85卷 213-223页

作者： Bingyao Wang Tianyi Cai Xiaoshu Cai Wu Zhou Zeqi Liu Schoolof Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093China shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093China Jiaxing MeaParTech Instrument Technology co. LtdZhejiang314000China

The performance of nanoparticles is often affected by particle size and ***,electron microsco.y or atomic force microsco.y is typically utilized to determine the size and morphology of ***,there are issues such as difficult sample preparation,long processing times,and challenges in quantitative ***,it is of great significance to develop a fast,accu-rate,and statistical method to measure the size and morphology of *** this study,a new method,called polarized imaging dynamic light scattering(PIDLS),is *** nanoparticles are irradiated with a vertical linearly polarized laser beam,and a polarization camera co.lected the dynamic light scattering images of particles at four different polarization directions(0°,45°,90°,and 135°)at a scattering angle of 90°.The average particle size and distribution are obtained using the imaging dy-namic light scattering method at 0°polarization direction,and the morphology of the particles is ob-tained based on the depolarization patterns of the scattered *** optical sphericityΦis defined based on the degree of linear polarization(DoLP).It is also implemented for the quantitative evaluation of the sphericity of the nanoparticles,including spherical,octahedral,nanoplate,nanorod,and linear *** with the Poincarésphere parameterψ,the morphology of the nanoparticles can be roughly *** addition,PIDLS enables the measurement of particle size and morphology distributions simultaneously for evaluating the uniformity of *** effectiveness of PIDLS is verified by the measurement of five kinds of industrial titanium dioxide as well.

关键词： Imaging dynamic light scattering Polarized light scattering Non-spherical nanoparticles Morphology Online measurement

Failure of Cronobacter sakazakii to acquire direct and cross-protection against lethal stresses after exposure to sublethal ethanol

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Food Quality and Safety 2024年第1期8卷 81-91页

作者： Hongmei Niu Xiang Wang Yuan Wang Xiaojie Qin Yangtai Liu Zhuosi Li Xu Wang Wantong Zhang Qingli Dong School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghaiChina School of Food and Drugs Shanghai Zhongqiao Vocational and Technical UniversityShanghaiChina Yili Group Innovation Centre ShanghaiChina Yili Yinuo Technology(shanghai)co. Ltd.ShanghaiChina

Cronobacter sakazakii may enco.nter subinhibitory co.centrations of ethanol stress over its *** tolerance to homologous or heterologous stress agents may be altered as a result of ethanol adaptive ***,the tolerance of ethanol-exposed and co.trol cells to subsequent lethal stresses was evaluated in the current *** was disco.ered that sublethal ethanol exposure increased the susceptibility to lethal ethanol stress in *** as determined by the Weibull ***,sublethal ethanol co.centration exposure in *** did not lead to any cross-tolerance against other stressors such as benzalkonium chloride(120 mg/L),heat(55°C),co.d(4°C),simulated gastric fuid(pH 3.0),osmotic stress(sorbitol,0.75 g/mL),and desiccation *** of zeta potential,scanning electron microsco.e,and surface-enhanced Raman spectrosco.y spectra revealed that cellular injury and changes in cellular chemical co.position may co.tribute to the reduced resistance of *** after ethanol ***,sublethal ethanol exposure resulted in an elevated proportion of unsaturated fatty acids(USFA),while reducing the proportion of saturated fatty acids(SFA)and the ratio of SFA to *** developed inactivation models can serve as a valuable source of data to support quantitative microbial risk ***,a better understanding of the response of *** to sublethal ethanol exposure may provide valuable insights into the prevention and co.trol of ***.

关键词： Cronobacter sakazakii ethanol exposure stress tolerance direct resistance cross-resistance mechanisms.