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design and motion testing of a Multiple SMA fin driven BIUV

Journal of Hydrodynamics 2019年第1期31卷 124-136页

作者： yong-hua Zhang Jian-hui he Kinhuat Low department of Mechatronics Engineering Taizhou Vocational and Technical CollegeTaizhou 318000China School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore

Fishes interact with the fluid environment using various *** multiple control surfaces work in combination to produce the thrust and the balance torques in a steady swimming,to maneuver and to position themselves accurately even in turbulent *** motivate us to embark on a research program designed to develop an agile biologically inspired robotic fish based on the performance of multiple *** accomplish this goal,a mechanical ray-like fin actuated by the shape memory alloy (SMA) is developed,which can realize the oscillating motion,the undulating motion or even the complex three dimensional *** basic unit is the two opposite side SMA-driven plate,namely the fin *** a result,a lightweight bio-inspired fin is constructed by placing radially multiple SMA fin rays.A biologically inspired underwater vehicle (BIUV) is later built using the above multiple lightweight bio-inspired *** common arrangement styles of multiple fins on the BIUV are considered here:one is the posterior fin (for the oscillating motion) that is parallel to the anterior fins (for the undulating motion),another one is the posterior fin that perpendicular to the anterior *** kinematic modeling,the deformation modeling and the detecting of the SMA fin are *** thrust generation is also ***,an experiment is conducted to test the performance of the proposed two arrangement styles,including the comparison of the averaged propulsion velocity and the averaged thrust under certain kinematic ***,the influence of the frequency and the amplitude of the SMA fin ray on the propulsion performance is also investigated.

关键词： Oscillating undulating shape memory alloy (SMA) biologically inspired underwater vehicle (BIUV) fin ray

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Statistical characteristics of the equatorial boundary of the nightside auroral particle precipitation

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Science China Earth Sciences 2015年第9期58卷 1602-1608页

作者： NIU YanYuan ZHANG XiaoXin he Fei JIANG yong Nanjing University of Information Science & Technology Key Laboratory of Space Weather National Center for Space Weather China Meteorological Administration Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences

Based on the auroral electron/ion precipitation boundary database observed by the DMSP satellites during 1984–2009, the characteristics of the nightside equatorial boundaries of the electron precipitation（B1E） and the ion precipitation（B1I） in the Northern/Southern hemispheres（NH/SH） are statistically investigated. The results show： That most of the boundaries are located between magnetic latitude（MLAT） of 60°–70° with the mean MLAT for B1E/B1 I to be 64.30°N/63.22°N and 64.48°S/63.26°S in the NH and SH, respectively, indicating that B1 E and B1 I in both hemispheres are located in conjugated magnetic field lines with B1 E ~1.2° poleward of B1I; that the MLAT of B1 E and B1 I in both hemispheres shift to lower MLAT（from ~70° to ~55°） as geomagnetic activity increases; that MLAT of both B1 E and B1 I and their differences slowly decrease from dusk to midnight with some difference in both hemispheres during different levels of geomagnetic activities; that B1 E and B1 I in both hemisphere decrease linearly with Kp and exponentially with Dst, AE, and SYM-H, respectively, demonstrating that auroral particle precipitation is closely related with geomagnetic activity; that in different magnetic local time（MLT） sectors, the changing rates of the boundaries with Kp are different, and the rates of B1 E are generally larger than that of B1 I, implying that the difference between B1 E and B1 I reduce with increasing geomagnetic activity. Compared with previous studies, the statistical results based on the long-term large database in this paper can well reflect the properties of the equatorial boundaries of auroral precipitation and may be used for physical modeling or space weather forecasting in future.

关键词： auroral particle precipitation equatorial boudanry statistical characteristics geomagnetic activity

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Facile 3D cell culture protocol based on photocurable hydrogels

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Bio-design and Manufacturing 2021年第1期4卷 149-153页

作者： Mingjun Xie Yating Zheng Qing Gao yong he State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Engineering for Life Group(EFL) Suzhou 215101China

Introduction Why 3D cell culture urgently needed?Tissue engineering has extremely influenced the development process of basic biological studies and biomedical *** quite a long time,the vast majority of these researches have been relying on the experimental results of conventional two-dimensional(2D)cell culture in flask,petri dish or well ***,these 2D culture results could be very different with or even totally opposite to the actual situations in vivo where cells grow inside a 3D extracellular matrix(ECM).Therefore,3D cell culture has been playing a more and more significant role because of its higher accuracy and authenticity[1–4].

关键词： has culture quite

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Characteristics of gut microbiota dysbiosis in patients with colorectal polyps

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World Journal of Gastrointestinal Oncology 2025年第1期17卷 13-21页

作者： Xian-Rong Wu Xiao-Hong he yong-Fang Xie School of Life health Information Science and Engineering Chongqing Post and Communications UniversityChongqing 400065China

This editorial,inspired by a recent study published in the World Journal of Gastrointestinal Oncology,covers the research findings on microbiota changes in various *** recurrent colorectal polyps,the abundances of Klebsiella,Parvimonas,and Clostridium increase,while those of Bifidobacterium and Lactoba-cillus *** dysbiosis may promote the formation and recurrence of *** microbial changes have also been observed in colorectal cancer,inflammatory bowel disease,autism spectrum disorder,and metabolic syndrome,indicating the role of increased pathogens and decreased probiotics in these *** the gut microbiota,particularly by increasing probiotic levels,may help prevent polyp recurrence and promote gut *** microbial intervention strategy holds promise as an adjunctive treatment for patients with colorectal polyps.

关键词： Recurrent colorectal polyps Gut microbiota dysbiosis Klebsiella Probiotics Intestinal inflammation Microbial intervention strategy

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Numerical Simulation of Random Wave Overtopping of Rubble Mound Breakwater with Armor Units

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China Ocean Engineering 2021年第2期35卷 176-185页

作者： LI Jing-yuan ZHANG Qing-he LU yong-jun State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China

Based on the open source code OpenFOAM,a three-dimensional model is presented for simulation of the interaction between waves and rubble mound breakwater with armor *** armor units with their real geometries are depicted through computational *** volume-averaged RANS equation and the seepage equation containing nonlinear term are used to describe the percolation in the core and underlayer of the *** independence analysis are carried out,the horizontal and vertical grid size are recommended to take as one-fifteenth of the mean nominal diameter D_(50) of the armor units and one-fifteenth of the wave height *** wave overtopping of rubble mound breakwater with armor units is simulated through the proposed *** results show good agreement between the simulated and measured overtopping discharge rates for different types of armor *** developed numerical model can be used to evaluate the random wave overtopping in design of rubble mound breakwater with artificial armor blocs.

关键词： random wave armor units seepage equation overtopping discharges grid independence

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Chinese Physics Letters 2011年第5期28卷 184-186页

作者： he yong HU Xi-Wei JIANG Zhong-he Institute of Fluid Physics China Academy of Engineering PhysicsMianyang 621900 College of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074

Instability of a planar shock front perturbed by a corrugated interface is analyzed,where the perturbation wavelength is along the shock front *** presented analysis involves the effects of the features on the shock front,which is different from a general method presented by D'yakov and Kontorovich,where the shock front is taken as an infinitely *** growth rate of the instability of the perturbed shock front is obtained and compared with the growth rate of the Rayleigh-Taylor instability(RTI)of an interface,on which the density gradient and the initial conditions are similar to the perturbed shock *** analysis and comparisons of the growth rate of the instability indicate that the features of the shock front should be considered seriously in the shock interface interactions.

关键词： shock perturbed interface

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A 3D-printed microhemispherical shell resonator with electrostatic tuning for a Coriolis vibratory gyroscope

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Microsystems & Nanoengineering 2024年第2期10卷 25-35页

作者： Baoyin Hou Ye Zhu Chaofan he Weidong Wang Zhi Ding Wen he yong he Lufeng Che College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou310027China Center for Microelectronics Shaoxing InstituteZhejiang UniversityShaoxing312035China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310058China School of Mechanical Engineering Zhejiang UniversityHangzhou310058China

The emergence of microhemispherical resonant gyroscopes,which integrate the advantages of exceptional stability and long lifetime with miniaturization,has afforded new possibilities for the development of whole-angle ***,existing methods used for manufacturing microhemispherical resonant gyroscopes based on MEMS technology face the primary drawback of intricate and costly ***,we report the design,fabrication,and characterization of the first 3D-printable microhemispherical shell resonator for a Coriolis vibrating *** remarkably achieve fabrication in just two steps bypassing the dozen or so steps required in traditional *** utilizing the intricate shaping capability and ultrahigh precision offered by projection microstereolithography,we fabricate 3D high-aspect-ratio resonant structures and controllable capacitive air gaps,both of which are extremely difficult to obtain via MEMS *** addition,the resonance frequency of the fabricated resonators can be tuned by electrostatic forces,and the fabricated resonators exhibit a higher quality factor in air than do typical MEMS microhemispherical *** work demonstrates the feasibility of rapidly batch-manufacturing microhemispherical shell resonators,paving the way for the development of microhemispherical resonator gyroscopes for portable inertial ***,this particular design concept could be further applied to increase uptake of resonator tools in the MEMS community.

关键词： resonator tuning electrostatic

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Simulation Investigation on Optical and Electrical Properties of Carbon Nanotube in Terahertz Region

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Communications in Theoretical Physics 2009年第1期51卷 161-164页

作者： he Xiao-yong FU Xiao-Nan School of Science Henan University of Technology Zhengzhou 450001 China

Under the framework of Maxwell-Garnett （M-G） model, the optical and electrical properties of singlewalled carbon naotube （SWCNT）, double-walled carbon nanotube （DWCNT） and hydrogen-doped carbon nanotube （H-doped GNT） in terahertz （THz） region have been investigated. It has been found that as frequency increases the loss tangent and conductivity show a peak. The loss tangent and conductivity of SWCNT is larger than that of DWCNT and H-doped CNT. The loss tangent and conductivity increase with the increases of filling factor and the decreases of geometrical factor.

关键词： terahertz nanotube Maxwell- Garnett model

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Identification of automobile transmission fluid using hyperspectral imaging technology

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International Journal of Agricultural and Biological Engineering 2014年第4期7卷 81-85页

作者： Jiang Lulu Yu Xinjie he yong Zhejiang Technology Institute of Economy Hangzhou 310018China Ningbo Institute of Technology Zhejiang UniversityNingbo 315100China College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China

An identification method combining sparse representation with principal component analysis(PCA)was proposed for discriminating varieties of transmission fluid of automobile by using hyperspectral imaging *** component analysis was applied to obtain the characteristic information in the 874-1733 nm *** each transmission fluid variety,80 samples were randomly selected as the training set,and 20 samples as the testing *** eigenvectors of all training samples form the matrix were used for the sparse representation,and the problem of transmission fluid types classification was transformed into one to solve a sample expressed by the overall training sample matrix through optimization under the 11 *** results demonstrate that the accuracy of the algorithm that was composed of sparse representation and principal component analysis(PCA)was 93%.The accuracy is higher than those of PCA-LDA(Linear Discriminant Analysis)and PCA-LS-SVM(Least Squares Support Vector Machine).Therefore,the proposed method provides a better approach for the identification of transmission fluid types.

关键词： transmission fluid hyperspectral image sparse representation principal component analysis identification

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Analysis and optimization of performance parameters of the^(220)Rn chamber in flow-field mode using computational fluid dynamics method

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Nuclear Science and Techniques 2024年第10期35卷 70-85页

作者： Shao-Hua Hu yong-Jun Ye Zheng-Zhong he de-Tao Xiao Xiang-Yu Xu Jian-Kai Wang Qing-Zhi Zhou School of Nuclear Science and Technology University of South ChinaHengyang 421001China School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China

The impact of the radiation dose produced by^(222)Rn/^(220)Rn and its progeny on human health has garnered increasing interest in the nuclear research *** establishment of robust,regulatory,and competent^(220)Rn chambers is crucial for accurately measuring radioactivity ***,studying the uniformity of the^(220)Rn progeny through experimental methods is challenging,because measuring the concentration of^(220)Rn and its progeny in multiple spatial locations simultaneously and in real time using experimental methods is ***,achieving precise control of the concentration of^(220)Rn and its progeny as well as the reliable sampling of the progeny pose significant *** solve this problem,this study uses computational fluid dynamics to obtain the flow-field data of the^(220)Rn chamber under different wind speeds and progenyreplenishment *** analysis of the concentration distribution of the progeny and quantitative analysis of the progeny concentration and uniformity of the progeny concentration are *** research findings indicated that the progeny concentration level is primarily influenced by wind speed and the progeny-complement *** speed also plays a crucial role in determining progeny concentration uniformity,whereas the progeny-complement rate has minimal impact on *** ensure the accuracy of^(220)Rn progeny concentration sampling,we propose a methodology for selecting an appropriate sampling area based on varying progeny *** study holds immense importance for enhancing the regulation and measurement standards of^(220)Rn and its progeny.

关键词： Thoron Progeny Regulatory CFD simulation

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