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  1. Article ; Online: Improving Surface Wear Resistance of Polyimide by Inserting KH550 Grafted GO.

    Liu, Chen / Song, Jingfu / Zhao, Gai / Ding, Qingjun

    Polymers

    2023  Volume 15, Issue 11

    Abstract: To improve the wear resistance of polyimide (PI), surface modification was developed. In this study, the tribological properties of graphene (GN), graphene oxide (GO), and KH550-grafted graphene oxide (K5-GO) modified PI were evaluated by molecular ... ...

    Abstract To improve the wear resistance of polyimide (PI), surface modification was developed. In this study, the tribological properties of graphene (GN), graphene oxide (GO), and KH550-grafted graphene oxide (K5-GO) modified PI were evaluated by molecular dynamics (MD) at the atomic level. The findings indicated that the addition of nanomaterials can significantly enhance the friction performance of PI. The friction coefficient of PI composites decreased from 0.253 to 0.232, 0.136, and 0.079 after coating GN, GO and K5-GO, respectively. Among them, the K5-GO/PI exhibited the best surface wear resistance. Importantly, the mechanism behind the modification of PI was thoroughly revealed by observing the wear state, analyzing the changes of interfacial interactions, interfacial temperature, and relative concentration.
    Language English
    Publishing date 2023-06-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15112577
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  2. Article: [Finite element analysis of the stability of Mason type Ⅲ radial head fracture fixed with three cross-bridge headless compression screw and locking plate].

    Yin, Hao / Li, Yan / Zhao, Gai / Xie, Jie / Ning, Ren-de / Zhou, En-Chang

    Zhongguo gu shang = China journal of orthopaedics and traumatology

    2024  Volume 37, Issue 1, Page(s) 57–60

    Abstract: Objective: To compare the biomechanical stability of three cross-bridge headless compression screws and locking plates in the fixation of Mason type Ⅲ radial head fractures by finite element method.: Methods: Using reverse modeling technology, the ... ...

    Abstract Objective: To compare the biomechanical stability of three cross-bridge headless compression screws and locking plates in the fixation of Mason type Ⅲ radial head fractures by finite element method.
    Methods: Using reverse modeling technology, the radial CT data and internal fixation data of a healthy 25-year-old male were imported into the relevant software. Three-dimensional finite element model of 3 cross-bridge headless compression screws and locking plates for MasonⅢ radial head fractures were established, and the radial head was loaded with 100 N axial loading. The maximum displacement, maximum Von Mises stress and stress distribution of the two groups were compared.
    Results: The maximum displacements of the three cross-bridge screws group and locking plate group were 0.069 mm and 0.087 mm respectively, and the Von Mises stress peaks were 18.59 MPa and 31.85 MPa respectively. The stress distribution of the three screws group was more uniform.
    Conclusion: Both internal fixation methods can provide good fixation effect. CoMPared with the locking plate fixation method, the 3 cross-bridge headless compression screws fixation is more stable and the stress distribution is more uniform.
    MeSH term(s) Male ; Humans ; Adult ; Finite Element Analysis ; Radial Head and Neck Fractures ; Bone Screws ; Biomechanical Phenomena ; Radius Fractures/surgery ; Fracture Fixation, Internal/methods ; Bone Plates ; Fractures, Comminuted
    Language Chinese
    Publishing date 2024-01-29
    Publishing country China
    Document type Case Reports ; English Abstract ; Journal Article
    ISSN 1003-0034
    ISSN 1003-0034
    DOI 10.12200/j.issn.1003-0034.20221010
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  3. Article: Improving Thermal Conductivity and Tribological Performance of Polyimide by Filling Cu, CNT, and Graphene.

    Liu, Chen / Song, Jingfu / Zhao, Gai / Yin, Yuhang / Ding, Qingjun

    Micromachines

    2023  Volume 14, Issue 3

    Abstract: The thermal conductivity, mechanical, and tribological properties of polyimide (PI) composites filled by copper (Cu), carbon nanotube (CNT), graphene nanosheet (GNS), or combination were investigated by molecular dynamics simulation (MD). The simulated ... ...

    Abstract The thermal conductivity, mechanical, and tribological properties of polyimide (PI) composites filled by copper (Cu), carbon nanotube (CNT), graphene nanosheet (GNS), or combination were investigated by molecular dynamics simulation (MD). The simulated results suggested that Cu can improve thermal stability and thermal conductivity, but it reduces mechanical properties and tribological properties. CNT and GNS significantly improved the thermal and tribological properties at low content, but they decreased the properties at high content. In this study, the modification mechanism, friction, and wear mechanism of different fillers on polyimide were revealed by observing the frictional interface evolution process from the atomic scale, extracting the atomic relative concentration, the temperature and velocity distribution at the friction interface, and other microscopic information.
    Language English
    Publishing date 2023-03-07
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi14030616
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  4. Article: Internet Behavior Preferences Predict Pathological Internet Use: A Latent Profile Analysis.

    Chen, Jiangtao / Liu, Jinmeng / Zhao, Gai / Kong, Fanchang

    Frontiers in psychology

    2021  Volume 12, Page(s) 644623

    Abstract: Recent research in the underlying structure of pathological Internet use (PIU) has produced considerable debate among academics, in which a new "person-centered" approach of studying PIU has recently gathered support but produced mixed results. This ... ...

    Abstract Recent research in the underlying structure of pathological Internet use (PIU) has produced considerable debate among academics, in which a new "person-centered" approach of studying PIU has recently gathered support but produced mixed results. This study used the latent profile analysis (LPA) to estimate the types of PIU in a large sample of college students (
    Language English
    Publishing date 2021-06-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2563826-9
    ISSN 1664-1078
    ISSN 1664-1078
    DOI 10.3389/fpsyg.2021.644623
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  5. Article ; Online: Theoretical and experimental analyses of a legged piezoelectric bending actuator with shoe soles made of polyimide composites.

    Zhu, Pancheng / Peng, Hanmin / Zhao, Gai / Chen, Ni

    The Review of scientific instruments

    2021  Volume 92, Issue 5, Page(s) 55002

    Abstract: Friction materials form a critical component of piezoelectric actuators, and wear of the material affects output and service life of the actuator. This paper examines the influence of polyimide (PI) composites when used as a friction material on the ... ...

    Abstract Friction materials form a critical component of piezoelectric actuators, and wear of the material affects output and service life of the actuator. This paper examines the influence of polyimide (PI) composites when used as a friction material on the performance of a legged piezoelectric bending actuator. We design and manufacture demountable shoe soles, made of a novel PI-based friction material, for an actuator. A Coulomb friction model is also established to determine the behavior resulting from contact-induced friction between the surface and the actuator. Reciprocating wear tests involving an insulation rubber pad against phosphor bronze and PI composites as friction materials yielded average friction coefficients of 0.21 and 0.28, respectively. We also found that PI composites have higher wear resistance than phosphor bronze, with a specific wear rate of 1.36 × 10
    Language English
    Publishing date 2021-07-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0045215
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  6. Article ; Online: Longitudinal predictions between executive function and general and specific psychiatric problems in school-age children.

    Zhao, Gai / Zhang, Haibo / Hu, Mingming / Wang, Daoyang / Wang, Yanpei / Pan, Zhiying / Wang, Yao / Tao, Sha

    Developmental psychology

    2023  Volume 59, Issue 11, Page(s) 2050–2064

    Abstract: This study examined the longitudinal associations of various executive function components with subsequent psychiatric problems in Chinese school-age children. Data from 1,639 children (44.36% girls) ages 6-13 years were drawn from the Children School ... ...

    Abstract This study examined the longitudinal associations of various executive function components with subsequent psychiatric problems in Chinese school-age children. Data from 1,639 children (44.36% girls) ages 6-13 years were drawn from the Children School Functions and Brain Development project. Executive function components were assessed by the cancellation test, the Corsi test, and the Wisconsin Card Sorting Test. Psychiatric problems were determined by parent report. All assessments were administered twice, separated by a 1-year interval. Cross-lagged panel models showed that cognitive flexibility and general psychiatric problems (general
    MeSH term(s) Female ; Humans ; Child ; Male ; Executive Function ; Longitudinal Studies ; Child Behavior Disorders/psychology ; Memory, Short-Term
    Language English
    Publishing date 2023-09-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2066223-3
    ISSN 1939-0599 ; 0012-1649
    ISSN (online) 1939-0599
    ISSN 0012-1649
    DOI 10.1037/dev0001625
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  7. Article ; Online: Biomechanical study of cornea response under orthokeratology lens therapy: A finite element analysis.

    Zhao, Gai-Ping / Zhai, Hai-Tao / Xiang, Hua-Zhong / Wu, Li-Ming / Chen, Qi-Ou / Chen, Chi / Zhou, Meng

    International journal for numerical methods in biomedical engineering

    2023  Volume 39, Issue 10, Page(s) e3691

    Abstract: Orthokeratology (OK) is becoming a mainstream modality for myopia correction and control, but its underlying mechanism is not yet fully understood. In this study, the biomechanical response of cornea under the OK lens was investigated to further ... ...

    Abstract Orthokeratology (OK) is becoming a mainstream modality for myopia correction and control, but its underlying mechanism is not yet fully understood. In this study, the biomechanical response of cornea under the OK lens was investigated to further understand the mechanism of OK therapy. Numerical models of the cornea and OK lens with different corneal refractive powers and myopia degrees were established to analyze features and differences of the spatial displacement and stress distribution in different areas of the anterior corneal surface by finite element method. Displacement distributions on the anterior cornea surface with refractive powers of 39.5, 43, 46 D, and myopia degrees of -1.0, -3.0, -6.0 D demonstrate similar deformation trends and nearly rotationally symmetrical attributes of different corneal parameters. Displacement of mid-peripheral cornea was significantly high compared with that of the central and peripheral cornea, peaking at ~2.4 mm off the corneal apex. The stress increased with the increase in myopia degrees and was significantly large for the myopia degrees of -6.0 D at S1; the stress at S2 and S6 was low and stable and did not differ much at S3; the stress at S4 and S5, however, was extremely high. In summary, simulation result of orthokeratology can effectively evaluate the performance of OK lens and it properly associates with the differential map of the corneal topography. The base curve of the OK lens may also play a role in mid-peripheral corneal steepening. The design around the OK lens' alignment curve needs to be optimized.
    MeSH term(s) Humans ; Finite Element Analysis ; Refraction, Ocular ; Orthokeratologic Procedures/methods ; Cornea ; Myopia/therapy
    Language English
    Publishing date 2023-02-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2540968-2
    ISSN 2040-7947 ; 2040-7939
    ISSN (online) 2040-7947
    ISSN 2040-7939
    DOI 10.1002/cnm.3691
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  8. Article ; Online: Tough, Long-Term, Water-Resistant, and Underwater Adhesion of Low-Molecular-Weight Supramolecular Adhesives.

    Li, Xing / Deng, Yan / Lai, Jinlei / Zhao, Gai / Dong, Shengyi

    Journal of the American Chemical Society

    2020  Volume 142, Issue 11, Page(s) 5371–5379

    Abstract: Modern functional adhesives have attracted considerable attention due to their reversible adhesion capacities and stimuli-responsive adhesion behavior. However, for modern functional adhesives, polymeric structures were highly necessary to realize ... ...

    Abstract Modern functional adhesives have attracted considerable attention due to their reversible adhesion capacities and stimuli-responsive adhesion behavior. However, for modern functional adhesives, polymeric structures were highly necessary to realize adhesion behaviors. Supramolecular adhesives from low-molecular-weight monomers were rarely recognized. Compared with polymeric adhesive materials, it remains challenging for supramolecualr adhesive materials to realize tough adhesion on wet surfaces or even under water. In this study, a new supramolecular adhesive consisting of low-molecular-weight monomers was successfully designed and prepared. Strong and long-term adhesion performance was realized on various surfaces, with a maximum adhesion strength of 4.174 MPa. This supramolecular adhesive exhibits tough and stable adhesion properties in high-moisture and underwater environments (including seawater). Long-term underwater adhesion tests display the potential application of low-molecular-weight adhesive as a marine adhesive.
    Language English
    Publishing date 2020-03-04
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.0c00520
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  9. Article: Tough, Long-Term, Water-Resistant, and Underwater Adhesion of Low-Molecular-Weight Supramolecular Adhesives

    Li, Xing / Deng, Yan / Lai, Jinlei / Zhao, Gai / Dong, Shengyi

    Journal of the American Chemical Society. 2020 Feb. 24, v. 142, no. 11

    2020  

    Abstract: Modern functional adhesives have attracted considerable attention due to their reversible adhesion capacities and stimuli-responsive adhesion behavior. However, for modern functional adhesives, polymeric structures were highly necessary to realize ... ...

    Abstract Modern functional adhesives have attracted considerable attention due to their reversible adhesion capacities and stimuli-responsive adhesion behavior. However, for modern functional adhesives, polymeric structures were highly necessary to realize adhesion behaviors. Supramolecular adhesives from low-molecular-weight monomers were rarely recognized. Compared with polymeric adhesive materials, it remains challenging for supramolecualr adhesive materials to realize tough adhesion on wet surfaces or even under water. In this study, a new supramolecular adhesive consisting of low-molecular-weight monomers was successfully designed and prepared. Strong and long-term adhesion performance was realized on various surfaces, with a maximum adhesion strength of 4.174 MPa. This supramolecular adhesive exhibits tough and stable adhesion properties in high-moisture and underwater environments (including seawater). Long-term underwater adhesion tests display the potential application of low-molecular-weight adhesive as a marine adhesive.
    Keywords adhesion ; adhesives ; polymers ; seawater
    Language English
    Dates of publication 2020-0224
    Size p. 5371-5379.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.0c00520
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  10. Article: Emulsion‐forming properties of heat‐induced pork myofibrillar protein affected by NaCl

    Zhu, Chao‐Zhi / Jin, Hao‐Quan / Yin, Feng / Cui, Wen‐Ming / Zhang, Qiu‐Hui / Zhao, Gai‐Ming

    International journal of food science & technology. 2021 June, v. 56, no. 6

    2021  

    Abstract: The emulsification characteristics of myofibrillar proteins (MPs) with different NaCl concentrations also affect the quality of meat products after cooking. We investigated the effects of heating (100 °C) on the solubility, emulsifying activity, and ... ...

    Abstract The emulsification characteristics of myofibrillar proteins (MPs) with different NaCl concentrations also affect the quality of meat products after cooking. We investigated the effects of heating (100 °C) on the solubility, emulsifying activity, and conformational and environmental changes of MPs prepared with different NaCl concentrations. Emulsifying activity increased with increasing NaCl prior to heating, but there was no significant effect after heating. The viscosity increased and particle size decreased with increasing NaCl before heating, but these properties did not change after heating. NaCl did not affect the amount of α‐helix and β‐sheet. We deduced that the different emulsifying activity of myofibrillar proteins with different NaCl concentrations after heating may have been due to changes in the local environment of MPs. An understanding of the physicochemical and functional properties of MPs would unlock an area for development of meat products at different NaCl and temperature in the food industry.
    Keywords emulsifying ; food industry ; heat ; particle size ; pork ; solubility ; temperature ; viscosity
    Language English
    Dates of publication 2021-06
    Size p. 3016-3025.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note NAL-AP-2-clean ; JOURNAL ARTICLE
    ZDB-ID 883561-5
    ISSN 0950-5423
    ISSN 0950-5423
    DOI 10.1111/ijfs.14945
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