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| 1 | An exact solution of unsteady Couette flow of generalized second grade fluid显示文摘The fractional calculus approach is introduced into the rheological constitutive model of a generalized second grade fluid. A constitutive model with fractional derivative is developed for the generalized second grade fluid. Unsteady Couette flow of the generalized second grade fluid is studied by using the method of the discrete inverse Laplace transform and generalized Mittag-Leffler function. And then an exact solution is obtained for this problem with arbitrary fractional derivative. This provides a new analytical tool for the study of viscoelastic fluid mechanics. | TAN Wenchang XIAN Feng WEI Lan | 2002 | Chinese Science Bulletin2002，47，21： | 17 |
| 2 | Asynchronous Brain-Computer Interface Shared Control of Robotic Grasping显示文摘The control of a high Degree of Freedom(DoF) robot to grasp a target in three-dimensional space using Brain-Computer Interface(BCI) remains a very difficult problem to solve. Design of synchronous BCI requires the user perform the brain activity task all the time according to the predefined paradigm; such a process is boring and fatiguing. Furthermore, the strategy of switching between robotic auto-control and BCI control is not very reliable because the accuracy of Motor Imagery(MI) pattern recognition rarely reaches 100%. In this paper, an asynchronous BCI shared control method is proposed for the high DoF robotic grasping task. The proposed method combines BCI control and automatic robotic control to simultaneously consider the robotic vision feedback and revise the unreasonable control commands. The user can easily mentally control the system and is only required to intervene and send brain commands to the automatic control system at the appropriate time according to the experience of the user. Two experiments are designed to validate our method: one aims to illustrate the accuracy of MI pattern recognition of our asynchronous BCI system; the other is the online practical experiment that controls the robot to grasp a target while avoiding an obstacle using the asynchronous BCI shared control method that can improve the safety and robustness of our system. | Wenchang Zhang Fuchun Sun Hang Wu Chuanqi Tan Yuzhen Ma | 2019 | Tsinghua Science and Technology2019，24，3： | 8 |
| 3 | A review of EEG-based brain-computer interface systems design显示文摘A brain-computer interface(BCI) system can recognize the mental activities pattern by computer algorithms to control the external devices. Electroencephalogram(EEG) is one of the most common used approach for BCI due to the convenience and non-invasive implement. Therefore, more and more BCIs have been designed for the disabled people that suffer from stroke or spinal cord injury to help them for rehabilitation and life. We introduce the common BCI paradigms, the signal processing, and feature extraction methods. Then, we survey the different combined modes of hybrids BCIs and review the design of the synchronous/asynchronous BCIs.Finally, the shared control methods are discussed. | Wenchang Zhang Chuanqi Tan Fuchun Sun Hang Wu Bo Zhang | 2018 | Translational Neuroscience and Clinics2018，4，2： | 5 |
| 4 | CCAR1 5' UTR as a natural miRancer of miR-1254 overrides tamoxifen resistance显示文摘 | Gaopeng Li Xiaoli Wu Wenchang Qian Huayong Cai Xinbao Sun Weijie Zhang Sheng Tan Zhengsheng Wu Pengxu Qian Keshuo Ding Xuefei Lu Xiao Zhang Hong Yan Haifeng Song Shouhong Guang Qingfa Wu Peter E Lobie Ge Shan Tao Zhu | 2016 | Cell Research2016，26，6： | 3 |
| 5 | A novel stochastic reaction-diffusion model of Ca^2+ blink in cardiac myocytes显示文摘In cardiac myocytes,the sarcoplasmic reticulum(SR)is the main storage organelle of free Ca^(2+).The concentration of free Ca^(2+)in the SR is 0.5–1.0 mmol/L and is 2–3 orders of magnitude greater than that in the cytosol.The SR is composed of interconnected cisternae(junctional SR,i.e.,JSR)and tubules(free SR network,i.e.,FSR)that extend throughout the cytosol[1].Ca^(2+)is released from the JSR into the cytosol via Ca^(2+)release units(CRUs, | Jinghui Li Wenjun Xie Xi Chen Yunlong Huo Heping Cheng Wenchang Tan | 2017 | Science Bulletin2017，62，1： | 2 |
| 6 | Biomechanical Manifestations of Diastolic and Systolic Function in Rats with Heart Failure with Preserved Ejection Fraction显示文摘Objective Heart failure(HF)is divided into two types:Heart failure with reduced ejection fraction(HFrEF)and heart failure with preserved ejection fraction(HFpEF).The latter always results in diastolic dysfunction,characterized by changes in mechanical properties.The objective of this study is to build a finite element(FE)model of HFpEF and analyze diastolic and systolic function in rats.Methods Ten Dahl salt-sensitive rats were fed either a low-salt(LS)(n=5)or highsalt(HS)(n=5)diet beginning at 7 weeks of age and scanned by ultrasonic machine at 14 weeks of age.A non-linear FE model of the left ventricle(LV)was built from cardiac echo images at end-diastole and passive material properties of the LV were prescribed using Fung’s transversely isotropic constitutive law.Fiber angles of the endocardium and epicardium were prescribed as 53°°and-52°,respectively,with respect to the circumferential direction and varied linearly through the LV wall.The method developed by Krishnamurthywas used to determine the unloaded geometry to estimate the Fung passive material parameters.LV end-diastolic pressure(EDP)was determined from the measured pressure waves and applied to the endocardium at the unloaded geometry to simulate passive filling.Active material properties of the LV were prescribed using Guccione’s time-varying elastance model and maximum isometric tension was scaled to match the measured peak systolic pressure.The finite element model was then coupled to the Windkessel model,whose parameters were adjusted to the measured hemodynamics.Results Measured LVEDPs of LS and HS rats were 4.9±3.4 mmHg and 13.2±5.4 mmHg(P-0.030 8),respectively.End-diastolic Cauchy stress along the fiber direction for LS rats was significantly lower than for HS rats(0.91±0.60 kPa vs 3.00±0.63 kPa,P=0.001 4)and there was a similar trend in end-diastolic Green Strain along the fiber direction(0.058±0.003 vs 0.072±0.010,P=0.012 8,Figure 1b),as well.There was no distinctive difference between end-systolic Cauchy stress along the fiber direction for LS rats and HS rats(17.2±4.3 kPa vs 17.2±5.5 kPa,P=0.991 9)but end-systolic Green Strain along the fiber direction for LS rats was significantly higher than for HS rats(-0. 108±0.017 vs-0.065±0.024,negative sign represents direction).Conclusions For rats with HFpEF,it is the elevated LVEDP that induces the increase in end-diastolic stress and strain,thereby leading to diastolic dysfunction.Because of the preserved ejection fraction,HFpEF has less effect on systolic function. | Zhongjie Yin Wenchang Tan | 2019 | 医用生物力学2019，34，A01： | 1 |
| 7 | Theoretical analysis of the velocity field, stress field and vortex sheet of generalized second order fluid with fractional anomalous diffusion显示文摘 | Mingyu Xu Wenchang Tan | 2001 | Science in China Series A: Mathematics2001，，11： | 1 |
| 8 | Near-Field Radiative Heat Transfer Between Two Plane Surfaces With One Having a Dielectric Coating P显示文摘 | FU Ceji TAN Wenchang | 2009 | 1 Quant Spectrosc Radiat Transfer2009，110，： | 1 |
| 9 | Hot deformation behavior of 51.1Zr–40.2Ti–4.5Al–4.2V alloy in the single β phase field显示文摘The hot deformation behavior of a newly developed 51.1Zr–40.2Ti–4.5Al–4.2 V alloy was investigated by compression tests in the deformation temperature range from 800 to 1050 ℃ and strain rate range from 10-3to 100 s-1. At low temperatures and high strain rates, the flow curves exhibited a pronounced stress drop at the very beginning of deformation, followed by a slow decrease in flow stress with increasing strain. The magnitude of the stress drop increased with decreasing deformation temperature and increasing strain rate. At high temperatures and low strain rates, the flow curves exhibited typical characteristics of dynamic recrystallization. A hyperbolic-sine Arrhenius-type equation was used to characterize the dependences of the flow stress on deformation temperature and strain rate. The activation energy for hot deformation decreased slightly with increasing strain and then tended to be a constant value. A microstructural mechanism map was presented to help visualize the microstructure of this alloy under different deformation conditions. | Jingli Duan Yuanbiao Tan Liyuan Ji Wenchang Liu Jingwu Zhang Riping Liu | 2015 | Progress in Natural Science:Materials International2015，25，1： | 1 |
| 10 | The impulsive motion of flat plate in a generalized second grade fluid显示文摘 | Tan Wenchang Xu Mingyu | 2002 | Mech Res Comm2002，29，： | 1 |
| 11 | A note on unsteady flows of a viscoelastic fluid with the fractional Maxwell model between two parallel plates显示文摘 | Tan Wenchang Pan Wenxiao Xu Mingyu | 2002 | International Journal of Non-Linear Mechanics2002，，5： | 1 |
| 12 | Intra-and inter-specific scaling laws of plants and animals显示文摘The allometric scaling laws of metabolism in 447 animal and 1200 plant species showed convex and concave curvatures between mass and metabolic rate,respectively.The objective of the study is to explain the difference of curvatures between animals and plants based on fractal models.Several intraspecific scaling laws were derived from an asymmetric vascular tree with the fractal dimension(i.e.,a in k^(a)_(1)+k^(a)_(2)+…-=1,where k_(i)refers to the ratio of daughter to mother diameters).Based on the intraspecific scaling laws,the allometric scaling exponent of metabolism(i.e.,an interspecific scaling law)was shown to be equal to one-third of fractal dimension.Moreover,a novel piecewise-defined function in conjunction with the intraspecific scaling laws was proposed to explain the diverse metabolic scaling in animals and plants.The intraspecific and interspecific scaling laws showed good agreement with morphometric measurements.The experimentally-validated scaling models predict the diversity of intraspecific and interspecific scaling seen in nature.To our knowledge,this is the first study to use fractal models to explain the convex and concave forms of metabolic scaling in animals and plants.The study resolves the long-term controversies to use the resource-transport network models for explanation of the allometric scaling law of metabolism. | Jiahang Li Hao Wu Ghassan S。Kassab Wenchang Tan Yunlong Huo | 2021 | Acta Mechanica Sinica2021，37，2： | 0 |
| 13 | Effect of seeding biofloc on the nitrification establishment in moving bed biofilm reactor(MBBR)显示文摘In recirculating aquaculture systems,nitrification is usually accelerated by inoculating nitrifier or mature biocarriers.In this study,the performance of the establishment of nitrification in the MBBR according to three different strategies:conventional method(Control group A),inoculation with biofloc recovered from a tilapia biofloc culture system(Group B),and addition with extra nitrite(Group C)in the Moving bed biofilm reactor(MBBR)was compared.Among them,the biofloc-inoculated group considerably accelerated the nitrification process in the MBBR(38 d),which is roughly 18 d faster than the control group(A)(56 d)and 21 d faster than group C(59 d).Less ammonia(8 mg/L NH_(4)^(+)-N,10 mg/L in other groups)and external nitrite(2 mg/L NO_(2)��^(-)N)in the influent caused effluent ammonia to drop more slowly(5 d slower than the control group,8 d slower than the B group),which is detrimental to the nitrification process’development.Notably,the influent’s hydraulic retention time(HRT)was reduced from 12 h to 6 h following the successful establishment of nitrification.During the adaptation to reduced HRT,the MBBR inoculated with biofloc experienced short-term changes in the water quality index of the effluent water,whereas the other groups did not.The biofilm seeded with biofloc had the highest mean gray value ratio(1.42)of live/dead cell fluorescence,which grew better and could cover the entire groove under multiple microscope observations.However,the other groups did not demonstrate a similar trend.In summary,the research found that seeding biofloc use as nitrification bioaugmentation into the MBBR of the recirculating aquaculture system(RAS)to greatly speed up the nitrification process. | Hanwen Zheng Guozhi Luo Godwin Abakari Guoji Lv Hongxin Tan Wenchang Liu | 2023 | Aquaculture and Fisheries2023，8，6： | 0 |
| 14 | HEAT TRANSPORT IN HUMAN RESPIRATORY TRACT: A MATHEMATICAL MEDOL AND ITS ANALYTICAL SOLUTION显示文摘In this paper a mathematical model of heat transport in human respiratory tract was developed and solved analytically. By means of computer, the mean intra-temperature was calculated. It was consistent with the experimenatal data. | Tan Wenchang,Xu Mingyu (Research Center for Biomedical Engineering, Shandong University, Jinan, 250100, China) | 1995 | Chinese Journal of Biomedical Engineering(English Edition)1995，4，2： | 0 |
| 15 | A Texture-Based Multi Scale Analysis on Rat’s Arteries Relating to Location and Aging显示文摘The bridge between macro and micro scale has been arousing people’s attention for years.As for the vessel wall,the link between material property and microstructural network remains unknown,leaving potential possibility to discover the intrinsic mechanism of biological compound material.The objective of the study is to perform a novel analysis method to investigate how microstructure unit contributes to its mechanical characteristics and what kind of factors relating to macro properties of vessel wall may affect its micro characteristics.In this study,we chose to employ a texture analysis to describe and measure spatial network-like structure and collagen fiber alignment patterns in abdominal aorta,femoral artery and carotid artery of rats,respectively.Several first order texture statistics and second order texture statistics have been selected to be embedded into a feature matrix to characterize significance structural distinction(P<0.01)of the aforementioned types of arteries.Also,aging would also be considered as a chronic factor to affect microstructural network.The featuring matrix was then used for training a SVM classifier to predict the artery’s types,age and mechanical properties based on mechanical tests data.(Accuracy=0.86)This analysis methodreveals the link between micro and macro scale of arterial mechanics and more findings will be uncovered based on the framework in the future. | Hao Wu Wenchang Tan | 2019 | 医用生物力学2019，34，A01： | 0 |
| 16 | Fluid-Structure Interaction Modeling of the Living Artery: Based on the Zero-Pressure Status and the Anisotropic Hyperelastic Constitutive Model显示文摘Vascular diseases such as aneurysm,hemadostenosis,aortic dissection are the primary causes of people’s death around world.As a result,it is significant to improve our knowledge about them,which can help to treat the disease.Measuring the hemodynamic factor like the blood pressure,the wall shear stress(WSS)and the oscillatory shear index(OSI)is,however,still beyond the capabilities of in-vivo measurement techniques.So the use of mathematical models and numerical simulations for the studies of the blood flow in arteries and,in general,of the cardiovascular system,both in physiological and pathological conditions,has received an increasing attention in the biomedical community during the last two decades.Indeed,such studies aims at enhancing the current knowledge of the physiology of the cardiovascular system,as well as providing reliable tools for the medical doctors to predict the natural course of pathologies and,possibly,the occurrence of cardiovascular accidents.The computational vascular fluid-structure interaction(FSI)methodology is a numerical simulation method which is used to explain the hemodynamic factors.The WSS on the luminal wall and the mechanical stress in the vascular wall are directly related to the location of the lesion,and the blood flow strongly interacts with the vascular wall motion.The arterial wall continually adapts to the charge of its mechanical environment(due to,for example,growth,atrophy,remodelling,repair,ageing,and disease)and consequently undergoes several irreversible processes.Primary acute mechanisms of vascularFSI numerical simulation seem to be associated with(1)the arterial histology and the patient-specific complex geometry,(2)the typical mechanical properties of the layer,(3)properties of the blood is assumed as Newtonian fluid or non-Newtonian fluid based on the scale ofthe diameter of a vessel,(4)residual stress in the zero-pressure configuration.The arterial system naturally function under permanent physiological loading conditions.Fung defined the residual stress and measured the opening angle which varies greatly along the aortic tree.Consequently,most of these systems never experience a stress-free state in their’service life’,so a stress and strain fields are present in any in vivo obtained patientspecific cardiovascular geometry.The residual stress always be ignored in FSI simulation or be assumed to equal zero,and the vivo patient-specific artery geometry is assumed as zero-pressure configuration.To define the in vivo stress state of artery,an inverse problem needs to be solved:the undeformed shape of a body or its stress state in its deformed state needs to be determined given the deformed configuration and the loads causing this deformation.The modular inverse elastostatics method is used to resolve the pressure-induced stress state for in vivo imaging based on cardiovascular modeling proposed by Peirlinck.Here,we build a living vessel FSI model based on 4 key factors.In order to get the universal simulation results,we focus on idealized geometries of the vessel that represent healthy(physiological)conditions of the cerebral vasculature.Blood can be assumed as the Newtonian fluid at this scale.The anisotropic hyperelastic constitutive law(Gasser-Holzapfel-Ogden)is used in zero-pressure configuration.Afterwards,we propose the material parameters for the different constitutive models and the computational configurations.We demonstrate the importance of introducing the residual stress into vascular blood flow modeling by performing a comparing zero-pressure configuration and no-resistance configuration.We get the conclusion that the zero-pressure status model has smaller displacement and larger stress distribution compared with no-resistance stress model.Hence,the methodology presented here will be particularly useful to study the mechanobiological processes in the healthy and diseased vascular wall. | Dongliang Zhao Wenchang Tan | 2019 | 医用生物力学2019，34，A01： | 0 |
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