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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1863-1888页

作者： zihan wang Boshan Zhang Hui wang Qing Ai Xingchun Huang School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Department of Bridge Engineering Tongji UniversityShanghai200092China

The application of ultra-high performance concrete(UHPC)as a covering layer for steel bridge decks has gained widespread popularity.By employing a connection without a shear connector between the steel plate and UHPC,namely,the sandblasted interface and the epoxy adhesive with sprinkled basalt aggregate interface,the installation cannot only be simplified but also the stress concentration resulting from the welded shear connectors can be eliminated.This study develops constitutive models for these two interfaces without shear connectors,based on the interfacial pull-off and push-out tests.For validation,three-point bending tests on the steel-UHPC composite plates are conducted.The results indicated that the proposed bilinear traction-separation model for the sandblasted interface and the trapezoidal traction-separation model for the epoxy adhesive with sprinkled basalt aggregate interface can generally calibrate the interfacial behavior.However,the utilization of the experimentally determined pure shear strength underestimates the load-carrying capacity of the composite plates in the case of three-point bending tests.By recalling the Mohr-Coulomb criterion,this underestimation is attributed to the enhancement of the interface shear strength by the presence of normal stress.

关键词： Cohesive zone model interfacial behavior finite element simulation UHPC steel plate

Effect of simulated gastrointestinal digestion on antioxidant,and anti-inflammatory activities of bioactive peptides generated in sausages fermented with Staphylococcus simulans QB7

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Food Science and Human Wellness 2024年第3期13卷 1662-1671页

作者： Hongying Li Hongbing Fan zihan wang Qiujin Zhu Jianping Wu Laboratory of Animal Genetics Breeding and Reproduction in the Plateau Mountainous RegionMinistry of EducationCollege of Life SciencesGuizhou UniversityGuiyang 550025China Department of Agricultural Food and Nutritional ScienceUniversity of AlbertaAlberta T6G 2P5Canada Department of Animal and Food Sciences University of KentuckyLexington 40546United States School of Liquor and Food Engineering Guizhou UniversityGuiyang 550025China

Dry-fermented sausages are a good source of bioactive peptides,whose stability against gastrointestinal(GI)digestion determines their bioaccessibility.This study focused on evaluating the effect of peptide extracts from sausages fermented with Staphylococcus simulans QB7 during in vitro simulated GI digestion,including peptide profiles and antioxidant and anti-inflammatory activities.Peptides present in sausages were degraded during digestion,with molecular weight reduced from>12 kDa to<1.5 kDa.Besides,the content of amino acids increased from 381.15 to 527.07 mg/g,especially tyrosine being found only after GI digestion.The anti-inflammatory activities were increased after GI digestion,however,the changes in antioxidant activities were the opposite.A total number of 255,252 and 386 peptide sequences were identified in undigested,peptic-digested and GI-digested samples,respectively.PeptideRanker,BIOPEP-UWM and admetSAR were used to further predict the functional properties and intestinal absorption of the identified peptide sequences from GI digestion.Finally,18 peptides were discovered to possess either antioxidant or anti-inflammatory capacities.

关键词： Gastrointestinal digestion Sausages Bioaccessibility Anti-inflammatory activities

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Improving constraint on Ωfrom SDSS using marked correlation functions

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Limin Lai Jiacheng Ding Xiaolin Luo Yizhao Yang zihan wang Keshi Liu Guanfu Liu Xin wang Yi Zheng Zhaoyu Li Le Zhang Xiaodong Li School of Physics and Astronomy Sun Yat-sen University Zhuhai Campus Department of Astronomy Shanghai Jiao Tong University Department of Astronomy Tsinghua University CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area SYSU Peng Cheng Laboratory

Large-scale structure （LSS） surveys will increasingly provide stringent constraints on our cosmological models.Recently,the density-marked correlation function （MCF） has been introduced,offering an easily computable density-correlation statistic.Simulations have demonstrated that MCFs offer additional,independent constraints on cosmological models beyond the standard two-point correlation （2PCF）.In this study,we apply MCFs for the first time to SDSS CMASS data,aiming to investigate the statistical information regarding clustering and anisotropy properties in the Universe and assess the performance of various weighting schemes in MCFs,and finally obtain constraints on Ωm.Upon analyzing the CMASS data,we observe that,by combining different weights （α=[-0.2,0,0.2,0.6]）,the MCFs provide a tight and independent constraint on the cosmological parameter Ωm,yielding Ωm=0.293±0.006 at the 1σlevel,which represents a significant reduction in the statistical error by a factor of 3.4compared to that from 2PCF.Our constraint is consistent with recent findings from the small-scale clustering of BOSS galaxies(Zhai et al.Astronphys.J.948,99 （2023）) within the 1σlevel.However,we also find that our estimate is lower than the Planck measurements by about 2.6σ,indicating the potential presence of new physics beyond the standard cosmological model if all the systematics are fully corrected.The method outlined in this study can be extended to other surveys and datasets,allowing for the constraint of other cosmological parameters.Additionally,it serves as a valuable tool for forthcoming emulator analysis on the Chinese Space Station Telescope （CSST）.

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Improving constraint on Ωm from SDSS using marked correlation functions

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Science China(Physics,Mechanics & Astronomy) 2024年第8期Mechanics & Astronomy) .卷 211-228页

作者： Limin Lai Jiacheng Ding Xiaolin Luo Yizhao Yang zihan wang Keshi Liu Guanfu Liu Xin wang Yi Zheng Zhaoyu Li Le Zhang Xiao-Dong Li School of Physics and Astronomy Sun Yat-sen University Zhuhai Campus Department of Astronomy Shanghai Jiao Tong University Department of Astronomy Tsinghua University CSST Science Center for the Guangdong-Hong Kong-Macao Greater Bay Area SYSU Peng Cheng Laboratory

Large-scale structure（LSS） surveys will increasingly provide stringent constraints on our cosmological models. Recently, the density-marked correlation function（MCF） has been introduced, offering an easily computable density-correlation statistic. Simulations have demonstrated that MCFs offer additional, independent constraints on cosmological models beyond the standard two-point correlation（2PCF）. In this study, we apply MCFs for the first time to SDSS CMASS data, aiming to investigate the statistical information regarding clustering and anisotropy properties in the Universe and assess the performance of various weighting schemes in MCFs, and finally obtain constraints on Ωm. Upon analyzing the CMASS data, we observe that, by combining different weights（α = [-0.2, 0, 0.2, 0.6]）, the MCFs provide a tight and independent constraint on the cosmological parameter Ωm, yielding Ωm=0.293 ± 0.006 at the 1σ level, which represents a significant reduction in the statistical error by a factor of 3.4 compared to that from 2PCF. Our constraint is consistent with recent findings from the small-scale clustering of BOSS galaxies(Zhai et al. Astronphys. J. 948, 99（2023）) within the 1σ level. However, we also find that our estimate is lower than the Planck measurements by about 2.6σ, indicating the potential presence of new physics beyond the standard cosmological model if all the systematics are fully corrected. The method outlined in this study can be extended to other surveys and datasets, allowing for the constraint of other cosmological parameters. Additionally, it serves as a valuable tool for forthcoming emulator analysis on the Chinese Space Station Telescope（CSST）.

关键词： large scale structure of universe dark energy cosmological parameters marked weighted correlation function

High-stability temperature control and frequency-domain analysis of sandwich-like insulation design based on phase change materials for satellite thermal management

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Science China Technological Sciences 2024年

作者： wang zihan HE ChenBo HU Yang TANG GuiHua Key Laboratory of Thermo-Fluid Science and Engineering Ministry of Education School of Energy and Power Engineering Xi'an Jiaotong University

High-stability thermal management is critical for the measurements of high sensitivity for temperature, but also challenging because any small thermal disturbances could lead to unacceptable temperature fluctuations. The present work delivers a design for passive temperature control, customized for a component in the satellites for gravitational wave detection. A novel sandwichlike structure is proposed with the configurations of proper materials, consisting of a layer of insulation material and two layers of nanocomposite phase change materials, bringing an integration of heat insulation and absorption/storage. Its performance is examined using an improved thermal network model and the revised transfer function method（TFM）. The basic results of the two methods are validated by present COMSOL simulations and available numerical and experimental data in the literature. An effective reduction of temperature fluctuation is achieved to the scale of 0.1 K, even under two thermal disturbances from different directions: a radiative heat flux of 20 W m-2（inside） and a temperature fluctuation of about 20 K（outside）. Moreover,the TFM is employed to analyze the effects of the frequency of thermal disturbance: excellent damping performance is obtained for over 3.2 mHz and the underlying mechanism is discussed. Overall, the present design is expected to be combined with active temperature control to explore more possible ways for temperature control with higher stability.

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Synthetic two-dimensional electronics for transistor scaling

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Frontiers of physics 2023年第6期18卷 145-161页

作者： zihan wang Yan Yang Bin Hua Qingqing Ji School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Two-dimensional(2D)materials have been considered to hold promise for transistor ultrascaling,thanks to their atomically thin body immune to short-channel effects.The lower channel size limit of 2D transistors is yet to be revealed,as this size is below the spatial resolution of most lithographic techniques.In recent years,chemical approaches such as chemical vapor deposition(CVD)and metalorganic CVD(MOCVD)have been established to grow atomically precise nanostructures and heterostructures,thus allowing for synthetic construction of ultrascaled transistors.In this review,we summarize recent developments on the precise synthesis and defect engineering of electronic nanostructures/heterostructures aiming for transistor applications.We demonstrate with rich examples that ultrascaled 2D transistors are achievable by finely tuning the“growth-as-fabrication”process and could host a plethora of new device physics.Finally,by plotting the scaling trend of 2D transistors,we conclude that synthetic electronics possess superior scaling capability and could facilitate the development of post-Moore nanoelectronics.

关键词： 2D materials nanostructures synthetic electronics transistor scaling

Giant quartic-phonon decay in PVD-grownα-MoO_(3) flakes

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Nano Research 2023年第1期16卷 1115-1122页

作者： Yongsong wang Xiao Guo Siwen You Junjie Jiang zihan wang Fangping Ouyang Han Huang School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China School of Physics and Electronics Hunan Key Laboratory of Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China

Elementary excitations,such as in-plane anisotropic phonons and phonon polaritons(PhPs),inα-MoO_(3) play key roles in its outstanding physical properties like high carrier mobility and ultralow phonon thermal conductivity().Understanding the excitation mechanisms like phonon–phonon interactions is the most fundamental step to further applications.Here,we report on the systematic Raman investigations on phonon anisotropy and anharmonicity of representative Mo–O stretching vibration phonon modes(SVPMs)in physical vapor deposition(PVD)-grownα-MoO_(3) flakes.Polarizations of SVPMs verify the phonon anisotropy.The abnormal temperature dependence of SVPMs reveals that giant quartic-phonon decay dominates the phonon anharmonicity inα-MoO_(3).An ultrashort phonon lifetime of~0.34 ps gives evidence of theoretically predicted ultralow inα-MoO_(3).Our findings give deep insight into the phonon–phonon interactions inα-MoO_(3) and provide an indicator for its extreme thermal device applications.

关键词： layered materials synthesis phonon-phonon coupling anisotropy ultralow phonon thermal conductivity

Piezoelectric soft robot driven by mechanical energy

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Nano Research 2023年第4期16卷 4970-4979页

作者： Jiangfeng Lu Zicong Miao zihan wang Ying Liu Dekuan Zhu Jihong Yin Fei Tang Xiaohao wang Wenbo Ding Min Zhang Tsinghua-Berkeley Shenzhen Institute Tsinghua UniversityShenzhen 518055China Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing100084China

Power sources and energy-harvesting schemes are still grand challenges for soft robots.Notably,compared with other power sources,triboelectric nanogenerators(TENGs)have shown great potential because of their low manufacturing and fabrication costs,outstanding resilience,remarkable stability,and environmental friendliness.Herein,a triboelectric effect-driven piezoelectric soft robot(TEPSR)system is proposed,which integrates a rotary freestanding triboelectric nanogenerator(RFTENG)to drive a soft robot comprising a piezoelectric unimorph and electrostatic footpads.Based on the natural triboelectrification,through converting mechanical energy into electricity,TENG provides a unique approach for actuation and manipulation of the soft robot.The perfect combination provides the most straightforward way for creating a self-powered system.Experimentally,under the power of RF-TENG,the soft robot reaches a maximum moving speed of 10 cm per second and a turning rate of 89.7°per second,respectively.The actuation and manipulation demonstration are intuitively accomplished by maneuvering the robot around a maze with a 71 cm track within 28 s.For autonomous feedback controls,one practical application is carrying two infrared sensors on board to realize obstacle avoidance in an unstructured environment.Moreover,a micro-camera was equipped with the soft robot to provide real-time“first-person”video streaming,enhancing its detection capability.

关键词： triboelectric nanogenerator piezoelectric soft robot rapid actuation agile trajectory manipulation energy efficiency

Biomedical applications of the powder-based 3D printed titanium alloys:A review

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Journal of Materials Science & Technology 2022年第30期125卷 252-264页

作者： Amy X.Y.Guo Liangjie Cheng Shuai Zhan Shouyang Zhang Wei Xiong zihan wang Gang wang Shan Cecilia Cao Materials Genome Institute Shanghai UniversityShanghai 200444China

3D printing technology is a new type of precision forming technology and the core technology of the third industrial revolution.The powder-based 3D printing technology of titanium and its alloys have received great attention in biomedical applications since its advantages of custom manufacturing,costsaving,time-saving,and resource-saving potential.In particular,the personalized customization of 3D printing can meet specific needs and achieve precise control of micro-organization and structural design.The purpose of this review is to present the most advanced multi-material 3D printing methods for titanium-based biomaterials.We first reviewed the bone tissue engineering,the application of titanium alloy as bone substitutes and the development of manufacturing technology,which emphasized the advantages of 3D printing technology over traditional manufacturing methods.What is more,the optimization design of the hierarchical structure was analyzed to achieve the best mechanical properties,and the biocompatibility and osseointegration ability of the porous titanium alloy after implantation in living bodies was analyzed.Finally,we emphasized the development of digital tools such as artificial intelligence,which provides new ideas for the rational selection of processing parameters.The 3D printing titanium-based alloys will meet the huge market demand in the biomedical field,but there are still many challenges,such as the trade-off between high strength and low modulus,optimization of process parameters and structural design.We believe that the combination of mechanical models,machine learning,and metallurgical knowledge may shape the future of metal printing.

关键词： The powder-based 3D printing technology Ti-based alloys Biomedical applications Artificial intelligence

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A Broad Range Triboelectric Stiffness Sensor for Variable Inclusions Recognition

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Nano-Micro Letters 2023年第12期15卷 298-309页

作者： Ziyi Zhao Zhentan Quan Huaze Tang Qinghao Xu Hongfa Zhao zihan wang Ziwu Song Shoujie Li Ishara Dharmasena Changsheng Wu Wenbo Ding Tsinghua‑Berkeley Shenzhen Institute Institute of Data and InformationShenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China Institute of Ocean Engineering Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055People’s Republic of China Wolfson School of Mechanical Electrical and Manufacturing Engineering Loughborough UniversityLoughborough LE113TUUK Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore RISC-V International Open Source Laboratory 518055 ShenzhenPeople’s Republic of China

With the development of artificial intelligence,stiffness sensors are extensively utilized in various fields,and their integration with robots for automated palpation has gained significant attention.This study presents a broad range self-powered stiffness sensor based on the triboelectric nanogenerator(Stiff-TENG)for variable inclusions in soft objects detection.The Stiff-TENG employs a stacked structure comprising an indium tin oxide film,an elastic sponge,a fluorinated ethylene propylene film with a conductive ink electrode,and two acrylic pieces with a shielding layer.Through the decoupling method,the Stiff-TENG achieves stiffness detection of objects within 1.0 s.The output performance and characteristics of the TENG for different stiffness objects under 4 mm displacement are analyzed.The Stiff-TENG is successfully used to detect the heterogeneous stiffness structures,enabling effective recognition of variable inclusions in soft object,reaching a recognition accuracy of 99.7%.Furthermore,its adaptability makes it well-suited for the detection of pathological conditions within the human body,as pathological tissues often exhibit changes in the stiffness of internal organs.This research highlights the innovative applications of TENG and thereby showcases its immense potential in healthcare applications such as palpation which assesses pathological conditions based on organ stiffness.

关键词： Stiffness sensor Decoupling method Heterogeneous stiffness Variable inclusions Healthcare applications

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