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  1. Article: A dynamical overview of droplets in the transmission of respiratory infectious diseases.

    Zhou, Maoying / Zou, Jun

    Physics of fluids (Woodbury, N.Y. : 1994)

    2021  Volume 33, Issue 3, Page(s) 31301

    Abstract: The outbreak of the coronavirus disease has drawn public attention to the transmission of infectious pathogens, and as major carriers of those pathogens, respiratory droplets play an important role in the process of transmission. This Review describes ... ...

    Abstract The outbreak of the coronavirus disease has drawn public attention to the transmission of infectious pathogens, and as major carriers of those pathogens, respiratory droplets play an important role in the process of transmission. This Review describes respiratory droplets from a physical and mechanical perspective, especially their correlation with the transmission of infectious pathogens. It covers the important aspects of (i) the generation and expulsion of droplets during respiratory activities, (ii) the transport and evolution of respiratory droplets in the ambient environment, and (iii) the inhalation and deposition of droplets in the human respiratory tract. State-of-the-art experimental, computational, and theoretical models and results are presented, and the corresponding knowledge gaps are identified. This Review stresses the multidisciplinary nature of its subject and appeals for collaboration among different fields to fight the present pandemic.
    Language English
    Publishing date 2021-03-17
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 1472743-2
    ISSN 1089-7666 ; 1070-6631
    ISSN (online) 1089-7666
    ISSN 1070-6631
    DOI 10.1063/5.0039487
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The Impact of Pulsatile Flow on Suspension Force for Hydrodynamically Levitated Blood Pump.

    Fu, Yang / Hu, Yimin / Huang, Feng / Zhou, Maoying

    Journal of healthcare engineering

    2019  Volume 2019, Page(s) 8065920

    Abstract: Hydrodynamically levitated rotary blood pumps (RBPs) with noncontact bearing are effective to enhance the blood compatibility. The spiral groove bearing (SGB) is one of the key components which offer the suspension force to the RBP. Current studies focus ...

    Abstract Hydrodynamically levitated rotary blood pumps (RBPs) with noncontact bearing are effective to enhance the blood compatibility. The spiral groove bearing (SGB) is one of the key components which offer the suspension force to the RBP. Current studies focus on the suspension performance of the SGB under continuous flow condition. However, the RBP shows pulsatile characteristics in the actual clinical application, which may affect the suspension performance of the SGB. In this paper, the impact of pulsatile flow upon the suspension force from the SGB is studied. A model of the SGB with a groove formed of wedge-shaped spirals is built. Then, the CFD calculation of the hydrodynamic force offered by designed SGB under simulated pulsatile flow is introduced to obtain the pulsatile performance of the suspension force. The proposed method was validated by experiments measuring the hydrodynamic force with different bearing gaps. The results show that the suspension force of the SGB under pulsate flow is the same as under steady flow with equivalent effective pressure. This paper provides a method for suspension performance test of the SGB.
    MeSH term(s) Equipment Design ; Heart-Assist Devices ; Humans ; Hydrodynamics ; Mechanical Phenomena ; Models, Cardiovascular ; Pulsatile Flow/physiology
    Language English
    Publishing date 2019-06-03
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2545054-2
    ISSN 2040-2309 ; 2040-2295
    ISSN (online) 2040-2309
    ISSN 2040-2295
    DOI 10.1155/2019/8065920
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Modeling and Efficiency Analysis of a Piezoelectric Energy Harvester Based on the Flow Induced Vibration of a Piezoelectric Composite Pipe.

    Zhou, Maoying / Al-Furjan, Mohannad Saleh Hammadi / Wang, Ban

    Sensors (Basel, Switzerland)

    2018  Volume 18, Issue 12

    Abstract: This paper proposes and investigates a piezoelectric energy harvesting system based on the flow induced vibration of a piezoelectric composite cantilever pipe. Dynamic equations for the proposed energy harvester are derived considering the fluid- ... ...

    Abstract This paper proposes and investigates a piezoelectric energy harvesting system based on the flow induced vibration of a piezoelectric composite cantilever pipe. Dynamic equations for the proposed energy harvester are derived considering the fluid-structure interaction and piezoelectric coupling vibration. Linear global stability analysis of the fluid-solid-electric coupled system is done using the numerical continuation method to find the neutrally stable vibration mode of the system. A measure of the energy harvesting efficiency of the system is proposed and analyzed. A series of simulations are conducted to throw light upon the influences of mass ratio, dimensionless electromechanical coupling, and dimensionless connected resistance upon the critical reduced velocity and the normalized energy harvesting efficiency. The results provide useful guidelines for the practical design of piezoelectric energy harvester based on fluid structure interaction and indicate some future topics to be investigated to optimize the device performance.
    Language English
    Publishing date 2018-12-05
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s18124277
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Investigation upon the performance of piezoelectric energy harvester with elastic extensions

    Zhou, Maoying / Fu, Yang / Ji, Huawei

    2019  

    Abstract: Piezoelectric vibration energy harvesters have attracted much attention due to its potential to replace currently popular batteries and to provide an sustainable power sources. Many researchers have proposed ways to increase the performance of ... ...

    Abstract Piezoelectric vibration energy harvesters have attracted much attention due to its potential to replace currently popular batteries and to provide an sustainable power sources. Many researchers have proposed ways to increase the performance of piezoelectric energy harvesters like bandwidth, working frequency and output performance. Here in this contribution, we propose the method of using elastic extensions to tune the performance of a piezoelectric energy harvester. Mathematical model of the proposed device is derived and analyzed. Numerical simulations are done to investigate the influences of the derived parameters, like length ratio \lambda_l , bending stiffness ratio \lambda_B , and line density ratio \lambda_m . Results show that the elastic extension does change the motion of the proposed device and help tune the performance of piezoelectric energy harvesters.
    Keywords Physics - Applied Physics
    Subject code 621
    Publishing date 2019-10-26
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  5. Article ; Online: Self-contained soft electrofluidic actuators.

    Tang, Wei / Lin, Yangqiao / Zhang, Chao / Liang, Yuwen / Wang, Jinrong / Wang, Wei / Ji, Chen / Zhou, Maoying / Yang, Huayong / Zou, Jun

    Science advances

    2021  Volume 7, Issue 34

    Abstract: Soft robotics revolutionized human-robot interactions, yet there exist persistent challenges for developing high-performance soft actuators that are powerful, rapid, controllable, safe, and portable. Here, we introduce a class of self-contained soft ... ...

    Abstract Soft robotics revolutionized human-robot interactions, yet there exist persistent challenges for developing high-performance soft actuators that are powerful, rapid, controllable, safe, and portable. Here, we introduce a class of self-contained soft electrofluidic actuators (SEFAs), which can directly convert electrical energy into the mechanical energy of the actuators through electrically responsive fluids that drive the outside elastomer deformation. The use of special dielectric liquid enhances fluid flow capabilities, improving the actuation performance of the SEFAs. SEFAs are easily manufactured by using widely available materials and common fabrication techniques, and display excellent comprehensive performances in portability, controllability, rapid response, versatility, safety, and actuation. An artificial muscle stretching a joint and a soft bionic ray swimming in a tank demonstrate their effective performance. Hence, SEFAs offer a platform for developing soft actuators with potential applications in wearable assistant devices and soft robots.
    Language English
    Publishing date 2021-08-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.abf8080
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Design and Analysis of a Magnetically Coupled Multi-Frequency Hybrid Energy Harvester.

    Xu, Zhenlong / Yang, Hong / Zhang, Hao / Ci, Huawei / Zhou, Maoying / Wang, Wen / Meng, Aihua

    Sensors (Basel, Switzerland)

    2019  Volume 19, Issue 14

    Abstract: The approach to improve the output power of piezoelectric energy harvester is one of the current research hotspots. In the case where some sources have two or more discrete vibration frequencies, this paper proposed three types of magnetically coupled ... ...

    Abstract The approach to improve the output power of piezoelectric energy harvester is one of the current research hotspots. In the case where some sources have two or more discrete vibration frequencies, this paper proposed three types of magnetically coupled multi-frequency hybrid energy harvesters (MHEHs) to capture vibration energy composed of two discrete frequencies. Electromechanical coupling models were established to analyze the magnetic forces, and to evaluate the power generation characteristics, which were verified by the experimental test. The optimal structure was selected through the comparison. With 2 m/s
    Language English
    Publishing date 2019-07-20
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s19143203
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: In Situ Controlled Surface Microstructure of 3D Printed Ti Alloy to Promote Its Osteointegration.

    Shan, Lijun / Kadhum, Abdul Amir H / Al-Furjan, M S H / Weng, Wenjian / Gong, Youping / Cheng, Kui / Zhou, Maoying / Dong, Lingqing / Chen, Guojin / Takriff, Mohd S / Sulong, Abu Bakar

    Materials (Basel, Switzerland)

    2019  Volume 12, Issue 5

    Abstract: It is well known that three-dimensional (3D) printing is an emerging technology used to produce customized implants and surface characteristics of implants, strongly deciding their osseointegration ability. In this study, Ti alloy microspheres were ... ...

    Abstract It is well known that three-dimensional (3D) printing is an emerging technology used to produce customized implants and surface characteristics of implants, strongly deciding their osseointegration ability. In this study, Ti alloy microspheres were printed under selected rational printing parameters in order to tailor the surface micro-characteristics of the printed implants during additive manufacturing by an in situ, controlled way. The laser path and hatching space were responsible for the appearance of the stripy structure (S), while the bulbous structure (B) and bulbous⁻stripy composite surface (BS) were determined by contour scanning. A nano-sized structure could be superposed by hydrothermal treatment. The cytocompatibility was evaluated by culturing Mouse calvaria-derived preosteoblastic cells (MC3T3-E1). The results showed that three typical microstructured surfaces, S, B, and BS, could be achieved by varying the 3D printing parameters. Moreover, the osteogenic differentiation potential of the S, B, and BS surfaces could be significantly enhanced, and the addition of nano-sized structures could be further improved. The BS surface with nano-sized structure demonstrated the optimum osteogenic differentiation potential. The present research demonstrated an in situ, controlled way to tailor and optimize the surface structures in micro-size during the 3D printing process for an implant with higher osseointegration ability.
    Language English
    Publishing date 2019-03-10
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma12050815
    Database MEDical Literature Analysis and Retrieval System OnLINE

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