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Aggregate 2024年第1期5卷 460-472页

作者： jinyang Jiang Jiawen Zhang Lanxin Wang Zeyu Lu Fengjuan Wang Zhiyong liu Hongbo Zeng Jiangsu Key Laboratory of Construction Materials School of Materials Science and EngineeringSoutheast UniversityNanjingChinal 2Chemical and Materials EngineeringUniversity of AlbertaEdmontonAlbertaCanada

Peculiar hierarchical microstructures in creatures inspire modern material design with distinct functionalities.Creatures can effortlessly construct sophisticated yet long-range ordered microstructure across bio-membrane through ion secretion and precipitation.However,microstructure biomimicry in current technology generally requires elaborate,point-by-point fabrication.Herein,a spontaneous yet controllable strategy is developed to achieve surface microstructure engineering through a natural surface phenomenon similar to ion secretion-precipitation,that is,coupled dissolution-precipitation.A series of hierarchical microstructures on mineral surfaces in fluids with tunable morphology,orientation,dimension,and spatial distribution are achieved by simply controlling initial dissolution and fluid chemistry.In seawater,long-range ordered film of vertically aligned brucite flakes forms through interfacial dissolution,nucleation,and confinement-induced orientation of flakes with vertically grown{110}plane,on the edge of which,fusiform aragonite epitaxially precipitates.With negligible initial surface dissolution,prismatic aragonite epitaxially grows on a calcite polyhedron-packed surface.By tuning fluid chemistry,closely packed calcite polyhedron and loosely packed calcite micro-pillars are engineered through rapid and retarded precipitation,respectively.Surprisingly,the spontaneously grown microstructures resemble those deliberately created by human or found in nature,and tremendously modulate surface functionality.These findings open new possibilities for facile and customizable engineering of microstructural surfaces,hierarchical heterostructures,and biomimetic materials.

关键词： directional crystallization dissolution-precipitation chemistry hierarchical microstructures spontaneous growth surface engineering

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Mandatory information disclosure and innovation:Evidence from the disclosure of operational information

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China Journal of Accounting Research 2023年第2期16卷 69-88页

作者： jinyang liu Kangtao Ye Yurou liu Chinese Academy of Fiscal Sciences China School of Business Renmin University of ChinaChina School of Economics and Management Southwest Jiaotong UniversityChina

We use a quasi-natural experiment wherein the Shanghai Stock Exchange requires listed companies in certain industries to disclose operational information and a staggered difference-in-differences model to examine the impact of mandatory information disclosure on corporate innovation.We find that companies subject to mandatory operational information disclosure show significantly increased innovation.This effect is pronounced for companies classified as non-state-owned enterprises,facing severe financing constraints and a high degree of shareholder tunneling behavior and in competitive and high-tech industries.Although mandatory operational information disclosure reduces their competitive advantage,companies appear to compensate by increasing innovation.Our study highlights the positive impact of mandatory operational information disclosure,indicating that it contributes to the highquality development of both capital markets and companies.

关键词： Mandatory information disclosure Operational information disclosure Proprietary information Innovation

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WC Grain Growth Behavior During Selective Laser Melting of WC-Co Cemented Carbides

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Acta Metallurgica Sinica(English Letters) 2023年第6期36卷 949-961页

作者： jinyang liu Jian Chen Yang Lu Xin Deng Shanghua Wu Zhongliang Lu School of Electromechanical Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510635China Guangdong Master Group Co LtdYunfu 527400China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China Guangdong Xi’an Jiaotong University Academy Foshan 528300China Guangdong Industrial Training Center Guangdong Normal University of TechnologyGuangzhouChina

Scanning strategy is a critical parameter for selective laser melting(SLM)processing of metals,alloys as well as metalceramic composites,while related research has rarely been reported yet,especially for additive manufacturing of WC–Co cemented carbides.In this study,three scanning strategies,i.e.,stripe,checkerboard,and spiral scanning,were used for additive manufacturing of WC-32Co cemented carbides.Checkerboard scanning leads to the highest relative density of 96%.Stripe scanning results in the largest average WC grain size followed by checkerboard and spiral scanning.SLM-processed carbides demonstrate agglomeration of WC grains mixed with isolated Co pools and pores.The WC grain growth mechanisms of SLM-processed cemented carbides include mosaic agglomeration growth and incomplete and uneven step growth regardless of scanning strategies.

关键词： Cemented carbides Selective laser melting Scanning strategy Grain Microstructure

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Mechanical sensor PDLIM5 promotes the osteogenesis of human adipose-derived stem cells through microfilament alterations

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Genes & Diseases 2024年第3期11卷 136-139页

作者： Yuchao Yang Shutong Wu Rongmei Qu Congrong Wang jinyang Wang Asmat Ullah Khan You Pan Wenqing liu Jinhui Zhu Muhammad Akram Khan Chujiang Xu Jingxing Dai Jun Ouyang Guangdong Provincial Key Laboratory of Medical Biomechanics&National Key Discipline of Human Anatomy Schoolof BasicMedical SciencesSouthern Medical UniversityGuangzhouGuangdong 510515China Department of Laboratory Medicine Nanfang Hospital of Southern Medical UniversityGuangzhouGuangdong 510515China Department of Pathology Guangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong 510080China Department of Breast Surgery Guangxi Medical University Cancer HospitalNanningGuangxi 530000China Department of Veterinary Pathology Faculty of Veterinary and Animal SciencesPMAS Arid Agriculture UniversityRawalpindi 46300Pakistan Department of Orthopedics TCM-Integrated HospitalSouthern Medical UniversityGuangzhouGuangdong 510000China

Bone regeneration is a multifaceted,abstract,and wellcoordinated physiological progression of bone formation that participates in continuous regeneration and remodeling throughout life.However,when it comes to complex clinical situations requiring extensive bone regeneration,such as massive bone defects caused by injuries,infection,or tumor removal,traditional methods do not often yield good treatment strategies or protocols due to their limitations.

关键词： alterations injuries massive

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Tribological properties of oil-impregnated polyimide in double-contact friction under micro-oil lubrication conditions

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Friction 2023年第8期11卷 1493-1504页

作者： Jinbang LI jinyang liu Kai LI Ningning ZHOU Yang liu Xudong HU Shunli YIN Guorong WANG School of Mechanical Engineering&Mechanics Ningbo UniversityNingbo 315211China Healthy&Intelligent Kitchen Engineering Research Center of Zhejiang Province Ningbo 315211China Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control EngineeringBeijing 100029China Key Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo 315211China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

Oil-impregnated porous polyimide(iPPI)materials are usually used as retainer for bearings.In these bearings,balls and rings,balls and retainers are two different kinds of contact.In this paper,the friction and wear properties of iPPI were investigated using steel(disc)–steel(ball)–iPPI(pin)double-contact friction test rig for simulating the actual contact in bearings.The results show that compared with that of iPPI–steel single contact,the friction coefficient of iPPI–steel in double contacts is lower and decreases with the amount of additional oil.The surface of iPPI in single contact suffers more wear compared with that in double contacts.Different from single contact,the worn surfaces of iPPI in double contacts are blackened.The Raman spectra of worn surfaces of balls and discs indicate thatα-Fe_(2)O_(3) and Fe_(3)O_(4) were formed during rubbing of the double contacts.Many nanoscale iron oxide particles are found on the worn surfaces of iPPI in double contacts;on the contrary,few particles could be found on the surface in single contact.In double-contact friction,the nanoscale wear debris penetrates inside the iPPI material through the process of extruding and recycling of oil,which is the mechanism of the blackening of the iPPI worn surfaces.The studies show that the double-contact friction method is a new and effective method to study the friction in bearings,especially for those with polymer retainer.

关键词： porous polyimide(PPI) oil-impregnated material double-contact friction micro-oil lubrication

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Sensitive humidity sensor based on moisture-driven energy generation

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Nano Research 2024年第6期17卷 5578-5586页

作者： Qingchao Ni Qing Lou Chenglong Shen Guangsong Zheng Runwei Song Jingnan Hao Jialu liu jinyang Zhu Jinhao Zang Lin Dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials and School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The emergence of novel self-powered humidity sensors has attracted considerable attention in the fields of smart electronic devices and personal healthcare.Herein,self-powered humidity sensors have been fabricated using a moisture-driven energy generation(MEG)device based on asymmetric tubular graphitic carbon nitride(g-CN)films prepared on anodized aluminum(AAO)template.At a relative humidity(RH)of 96%,the MEG device can provide an open-circuit voltage of 0.47 V and a short-circuit current of 3.51μA,with a maximum output power of 0.08μW.With inherent self-powered ability and humidity response via current variation,an extraordinary response of 1.78×106%(41%-96%RH)can be gained from the MEG device.The possible power generation mechanism is that g-CN/AAO heterostructure can form ion gradient and diffusion under the action of moisture to convert chemical potential into electrical potential,evoking a connaturally sensitive response to humidity.Self-powered respiration monitoring device based on the sensor is designed to monitor human movement(sitting,warming up,and running)and sleep status(normal,snoring,and apnea),maintaining excellent stability during cumulative 12-h respiration monitoring.This self-powered humidity sensing technology has promising potential for extensive integration into smart electronic and round-the-clock health monitoring devices.

关键词： graphitic carbon nitride moisture-driven energy generation humidity sensor respiration monitoring

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A long non-coding RNA LncSync regulates mouse cardiomyocyte homeostasis and cardiac hypertrophy through coordination of miRNA actions

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Protein & Cell 2023年第2期14卷 153-157页

作者： Rujin Huang jinyang liu Xi Chen Ying Zhi Shuangyuan Ding Jia Ming Yulin Li Yangming Wang Jie Na Center for Stem Cell Biology and Regenerative Medicine School of MedicineTsinghua UniversityBeijing 100084China School of Life Sciences Tsinghua UniversityBeijing 100084China Capital Medical University Beijing 100084China Beijing Key Laboratory of Cardiometabolic Molecular Medicine Peking-Tsinghua Center for Life SciencesInstitute of Molecular MedicinePeking UniversityBeijing 100871China

Dear Editor,Maintenance of cardiomyocyte(CM)homeostasis is essential for normal heart function.Long-term imbalance in heart homeostasis could elicit irreversible adaptive change in cell structure and function and tissue architecture,exemplified as cardiac hyper-trophy and fibrosis,and eventually develop into heart failure(Shiojima et al.,2005).Therefore,identifying new genes and path-ways regulating CM homeostasis may help better understand the cause of cardiac hypertrophy.

关键词： homeostasis cardiac hypertrophy

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A new 2D van der Waals material with air stability and in-plane anisotropy

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Chinese Journal of Structural Chemistry 2023年第7期42卷 9-13页

作者： Han Wang jinyang liu Minjuan Li Yanqiang Li Yang Zhou Wei liu Junhua Luo Sangen Zhao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou350007China College of Physics and Energy Fujian Normal UniversityFuzhou350117China

1.Text 2D van der Waals materials possess intriguing features[1],especially optically,such as high nonlinear optical responses[2],broadband spectral response[3],and accessible exciton effects[4].Unlike conventional 2D materials with in-plane isotropy,such as graphene and M0S_(2),2D van der Waals materials with in-plane anisotropic possess in-plane low symmetry structure,inducing the in-plane anisotropic physical properties.Meanwhile,they can be easily moved to various substrates without lattice-matching problems.

关键词： properties. plane anisotropic

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Effective enhanced model for a large deformable soft pneumatic actuator

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Acta Mechanica Sinica 2020年第1期36卷 245-255页

作者： Qiping Xu jinyang liu Department of Engineering Mechanics Key Laboratory of Hydrodynamics(Ministry of Education)School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China

Soft pneumatic actuators have been widely used for implementing sophisticated and dexterous movements,due to numerous fascinating features compared with their rigid counterparts.Relatively speaking,modeling and analysis of an entire soft pneumatic actuator considering contact interaction between two adjacent air chambers is extremely rare,which is exactly what we are particularly interested in.Therefore,in order to establish an accurate mechanical model and analyze the overall configuration and stress distribution for the soft pneumatic actuator with large deflection,we consider the contact interaction of soft materials rather than hard materials,to produce an effective enhanced model for soft contact of a large deformable pneumatic actuator.In this article,a multiple-point contact approach is developed to circumvent the mutual penetration problem between adjacent air chambers of the soft actuator that occurs with the single-point contact approach employed in linear elastic rigid materials.In contrast to the previous simplified rod-based model that did not focus on contact interaction which was adopted to clarify the entire deformation of the actuator,the present model not only elaborates nonlinear large deformation and overall configuration variations,but also accurately delineates stress distribution law inside the chamber structure and the stress concentration phenomenon.By means of a corresponding static experiment,a comparison of the simulation results with experimental data validates the effectiveness and accuracy of this model employing a multiple-point contact approach.Excellent simulation of the actual bending deformation of the soft actuator is obtained,while mutual penetration is successfully circumvented,whereas the model with single-point contact cannot achieve those goals.Finally,as compared with the rod-based model,the results obtained using the proposed model are more consistent with experimental data,and simulation precision is improved.

关键词： Soft contact Large deformable pneumatic actuator Mutual penetration problem Multiple-point contact approach Stress distribution

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An improved dynamic model for a silicone material beam with large deformation

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Acta Mechanica Sinica 2018年第4期34卷 744-753页

作者： Qiping Xu jinyang liu Department of Engineering Mechanics School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong University

Dynamic modeling for incompressible hyperelastic materials with large deformation is an important issue in biomimetic applications. The previously proposed lower-order fully parameterized absolute nodal coordinate formulation（ANCF） beam element employs cubic interpolation in the longitudinal direction and linear interpolation in the transverse direction, whereas it cannot accurately describe the large bending deformation. On this account, a novel modeling method for studying the dynamic behavior of nonlinear materials is proposed in this paper. In this formulation, a higher-order beam element characterized by quadratic interpolation in the transverse directions is used in this investigation. Based on the Yeoh model and volumetric energy penalty function, the nonlinear elastic force matrices are derived within the ANCF framework. The feasibility and availability of the Yeoh model are verified through static experiment of nonlinear incompressible materials. Furthermore,dynamic simulation of a silicone cantilever beam under the gravity force is implemented to validate the superiority of the higher-order beam element. The simulation results obtained based on the Yeoh model by employing three different ANCF beam elements are compared with the result achieved from a commercial finite element package as the reference result. It is found that the results acquired utilizing a higher-order beam element are in good agreement with the reference results,while the results obtained using a lower-order beam element are different from the reference results. In addition, the stiffening problem caused by volumetric locking can be resolved effectively by applying a higher-order beam element. It is concluded that the proposed higher-order beam element formulation has satisfying accuracy in simulating dynamic motion process of the silicone beam.

关键词： Dynamic modeling Nonlinear incompressible hyperelastic materials Novel modeling method Yeoh model Absolute nodal coordinate formulation

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