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Capacitive micromachined ultrasound transducers for intravascular ultrasound imaging

Microsystems & Nanoengineering 2020年第1期6卷 565-577页

作者： Jiaqi wang Zhou Zheng Jasmine Chan john t.w.yeow Department of Systems Design Engineering Faculty of EngineeringUniversity of WaterlooWaterlooON N2L 3G1Canada

Intravascular ultrasound(IVUS)is a burgeoning imaging technology that provides vital information for the diagnosis of coronary arterial diseases.A significant constituent that enables the IVUS system to attain high-resolution images is the ultrasound transducer,which acts as both a transmitter that sends acoustic waves and a detector that receives the returning *** the most mature form of ultrasound transducer available in the market,piezoelectric transducers have dominated the field of biomedical ***,there are some drawbacks associated with using the traditional piezoelectric ultrasound transducers such as difficulties in the fabrication of high-density arrays,which would aid in the acceleration of the imaging speed and alleviate motion *** advent of microelectromechanical system(MEMS)technology has brought about the development of micromachined ultrasound transducers that would help to address this *** from the advantage of being able to be fabricated into arrays with lesser complications,the image quality of IVUS can be further enhanced with the easy integration of micromachined ultrasound transducers with complementary metal-oxide-semiconductor(CMOS).this would aid in the mitigation of parasitic capacitance,thereby improving the ***,there are two commonly investigated micromachined ultrasound transducers,piezoelectric micromachined ultrasound transducers(PMUts)and capacitive micromachined ultrasound transducers(CMUts).Currently,PMUts face a significant challenge where the fabricated PMUts do not function as per their ***,CMUts with different array configurations have been developed for *** this paper,the different ultrasound transducers,including conventional-piezoelectric transducers,PMUts and CMUts,are reviewed,and a summary of the recent progress of CMUts for IVUS is presented.

关键词： piezoelectric transducers thereby

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Experimental Validation of Nussbaum Gain Adaptive Control for a Polymer Composite Based Electromagnetic Micromirror

Experimental Validation of Nussbaum Gain Adaptive Control fo...

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第36届中国控制会议

作者： Jiazheng tan weijie Sun john t.w.yeow Department of Automation Science and Engineering South China University of Technology Advanced Micro/Nano Devices Laboratory Systems Design EngineeringUniversity of Waterloo

ISBN: (纸本)9781538629185

In this article, an adaptive controller based on Nussbaum gain technique and backstepping method is designed for a polymer composite based hard-magnetic micromirror. with the Nussbaum gain exploited, the unknown control direction problem is solved. As a result, the closed-loop system with proposed controller design is able to track the desired reference signal asymptotically. the effectiveness of the adaptive controller is verified by experimental results on a micromirror-based platform.

关键词： Nussbaum gain Backstepping design Unknown control direction Electromagnetic micromirror

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Integral Sliding Mode Based Optimal Composite Nonlinear Feedback Control for Capacitive Micromachined Ultrasonic transducers（CMUts） System

Integral Sliding Mode Based Optimal Composite Nonlinear Feed...

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第36届中国控制会议

作者： Yi Qin weijie Sun john t.w.yeow College of Automation Science and Engineering South China University of Technology Systems Design Engineering University of Waterloo

ISBN: (纸本)9781538629185

this paper originally applied an optimal sliding mode based optimal composite nonlinear feedback（ISM-CNF） control strategy to the capacitive micromachined ultrasonic transducers（CMUts） system. It is known that CMUts system is inherently unstable which results in pull-in phenomenon and sensitive to a small perturbations. therefore the major problem is to stablize the CMUtS system beyond the pull-in limit with the external disturbances and input saturation. we verified the effectiveness by CNF and optimal ISM-CNF control methods through extending the travel range of the CMUts gap. the simulation results show the optimal ISM-CNF control law which achieves robustness, quick response, negligible overshoot and extends the travel range to 90% of the initial gap is better than CNF control law in CMUts system.

关键词： CNF ISM MEMS CMUts Robust Feedback Control

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An infrared photothermoelectric detector enabled by MXene and PEDOt:PSS composite for noncontact fingertip tracking

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Microsystems & Nanoengineering 2023年第1期9卷 229-239页

作者： Jiaqi wang Zhemiao Xie Guanxuan Lu Jiayu Alexander Liu john t.w.yeow Advanced Micro-/Nano-Devices Lab Department of Systems Design EngineeringUniversity of Waterloo200 University Ave WestWaterlooONN2L 3G1Canada

Photothermoelectric(PtE)detectors functioning on the infrared spectrum show much potential for use in many fields,such as energy harvesting,nondestructive monitoring,and imaging *** advances in low-dimensional and semiconductor materials research have facilitated new opportunities for PtE detectors to be applied in material and structural ***,these materials applied in PtE detectors face some challenges,such as unstable properties,high infrared reflection,and miniaturization ***,we report our fabrication of scalable bias-free PtE detectors based on ti3C2 and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOt:PSS)composites and characterization of their composite morphology and broadband *** also discuss various PtE engineering strategies,including substrate choices,electrode types,deposition methods,and vacuum ***,we simulate metamaterials using different materials and hole sizes and fabricated a gold metamaterial with a bottom-up configuration by simultaneously combining MXene and polymer,which achieved an infrared photoresponse ***,we demonstrate a fingertip gesture response using the metamaterial-integrated PtE *** research proposes numerous implications of MXene and its related composites for wearable devices and Internet of things(Iot)applications,such as the continuous biomedical tracking of human health conditions.

关键词： unstable composite sizes

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Design and Application of Enhanced Composite Nonlinear Feedback Control Based on Genetic Algorithm

Design and Application of Enhanced Composite Nonlinear Feedb...

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第37届中国控制会议

作者： Jia wei Ma Hui Chen wei Jie Sun john t.w.yeow Department of Automation Science and Engineering South China University of Technology School of Computer and Information Engineering HeNan University Systems Design Engineering University of Waterloo

Considering the parameter setting process is complicated in the design process of the current Composite Nonlinear Feedback Control law,this paper proposed an Enhanced CNF（Composite Nonlinear Feedback） controller based on Genetic *** the time multiplied by the absolute error of the integral as a performance indicator,the parameter tuning problem is turned into a minimization *** Genetic Algorithm is used to set all the design parameters of the Enhanced CNF controller at one *** proposed controller is introduced into the set-point control of the torsional micromirror,the simulation results demonstrate that the system can achieve the desired performance efficiently and accurately with the proposed controller.

关键词： Enhanced Composite Nonlinear Feedback Control Genetic Algorithm torsional Micromirror

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Pitaya detection in orchards using the MobileNet-YOLO model

Pitaya detection in orchards using the MobileNet-YOLO model

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第三十九届中国控制会议

作者： Xiuli Li Yi Qin Fujie wang Feng Guo john t.w.yeow Dongguan University of technology School of electrical engineering & intelligentization Shenzhen University College of Mechatron & Control Engineering University waterloo System Design Engineering

the real-time detection and recognition of pitaya fruit is an important prerequisite for automatic picking. we combined with the current deep learning method with good recognition accuracy to realize the real-time detection and identification of pitaya fruit. Firstly, we collected a large number of pictures of pitaya fruit for labeling, and completed the production of data sets of Pitaya fruit. then we use YOLOV3, YOLOV3-tiny and MobileNet-YOLO network models to train. After training, we test the performance of the trained model on the test data set. the experimental results show that the improved MobileNet-YOLO model has better detection speed than the YOLOV3 model, and the detection accuracy is better than the YOLOV3-tiny model. It can take into account the detection efficiency and accuracy, and detect the Pitaya fruit in the orchard in real time. Moreover, the MobileNet-YOLO model is a lightweight model, which can be deployed to the picking machine in the future, which can effectively provide Pitaya fruit detection and be applied to the actual environment of the orchard.

关键词： Deep learning YOLOV3 MobileNet-YOLO Real-time detection

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A GLOBAL FASt tERMINAL SLIDING MODE BACKStEPPING CONtROL FOR MEMS MICROMIRROR

A GLOBAL FAST TERMINAL SLIDING MODE BACKSTEPPING CONTROL FOR...

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第40届中国控制会议

作者： Yurong Li Qin Yi Fujie wang Fang Guo john t.w.yeow School of Electrical Engineering & Intelligentization Dongguan University of Technology Systems Design Engineering University of Waterloo

In this paper,a global fast terminal sliding mode controller（GFtSMC） based on a backstepping design is proposed for MEMS torsional micromirror *** hardware redesign,it’s an attractive way to improve the accuracy of tracking reference trajectory and guarantee convergence in limited *** the importance of timeliness in engineering applications,while not only ensure robustness,GFtSMC but also guarantee the system reach equilibrium in finite *** addition,system’s stability can be analyzed by using Lyapunov *** simulations,it’s observed that under GFtSMC,both robustness and timeliness of system can be guaranteed.

关键词： MEMS Micromirror Sliding Mode Lyapunov timeliness

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Aerodynamics of a tandem-Bladed Axial Compressor Rotor under Circumferential Distortion at Different Rotational Speeds

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Journal of thermal Science 2024年第4期33卷 1340-1356页

作者： Amit KUMAR Jerry t.john A.M.PRADEEP R.A.DAKKERMANS Dragan KOZULOVIC Department of Aerospace Engineering Indian Institute of Technology BombayMumbai400076India Department of Automotive and Aeronautical Engineering Hamburg University of Applied Sciences20099HamburgGermany Institute of Jet Propulsion Bundeswehr University Munich85577NeubibergGermany

For most aircraft engines,inflow distortion is *** distortion is known to degrade the aerodynamic performance and stable operating limits of a *** rotor configuration is an arrangement that effectively controls the growth of the boundary layer over the suction surface of the ***,a higher total pressure rise can be achieved through this unconventional design approach involving the splitting of the blade into forward and aft *** is expected that the effect of inlet flow distortion would be more severe for a tandem-rotor design due to the greater flow turning inherent in such ***,this aspect needs to be thoroughly *** present study discusses the effect of circumferential distortion on the tandem-rotor at different rotational ***-annulus RANS simulations using ANSYS CFX are used in the present *** performance of the rotor at a particular flow coefficient and different rotational speeds is *** total pressure and efficiency are observed to drop at lower mass flow rates under the influence of circumferential *** loss region in each blade passage is mainly associated with the blade wake,tip leakage vortex,secondary flow,and boundary ***,their contribution varies from passage to passage,particularly in the distorted *** the lower span,the wake width is found to be higher than that at a higher *** to the redistribution of the mass flow,the circumferential extent reduces at a higher *** the undistorted sector,the strength of the tip leakage vortex is significantly higher at the design rotational speed than at lower *** distortion near the tip region promotes an early vortex breakdown even at the design operating *** adversely affects the total pressure,efficiency,and stall *** clean flow conditions,this phenomenon is only observed near the stall *** the design operating condition,the breakdown of the forward rotor tip l

关键词： tandem rotor circumferential distortion loss tip leakage vortex vortex breakdown diffusion factor aerodynamics of compressor blade

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Desialylated Platelet Clearance in the Liver is a Novel Mechanism of Systemic Immunosuppression

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Research 2024年第3期2023卷 35-50页

作者： June Li Danielle Karakas Feng Xue Yingyu Chen Guangheng Zhu Yeni H.Yucel Sonya A.MacParland Haibo Zhang john w.Semple john Freedman Qizhen Shi Heyu Ni Department of Laboratory Medicine and Pathobiology University of TorontoTorontoONCanada toronto Platelet Immunobiology Group TorontoONCanada Keenan Research Centre for Biomedical Science of St.Michael's Hospital TorontoONCanada Canadian Blood Services Centre for Innovation TorontoONCanada Departments of Pediatrics Medical College of WisconsinMilwaukeeWIUSA Blood Research Institute Versiti WisconsinMilwaukeeWIUSA Departments of Ophthalmology and Vision Sciences Medicine University of TorontoTorontoONCanada Faculty of Engineering and Architectural Science Ryerson UniversityTorontoONCanada Multi-Organ transplant Program Toronto General Hospital Research InstituteTorontoONCanada Department of Immunology University of TorontoTorontoONCanada Critical Care Medicine Department ofAnesthesiology and PainUniversity of TorontoTorontoONCanada Department of Physiology University of TorontoTorontoONCanada Department of Pharmacology University of TorontoTorontoONCanada. Division of Hematology and transfusion Medicine Lund UniversityLundSweden clinical Immunology and transfusion Medicine Ofice of Medical ServicesRegion SkaneLundSweden Department of Medicine University of TorontoTorontoONCanada Children's Research Institute Children's WisconsinWauwatosaWIUSA Midwest Athletes Against Childhood Cancer Fund Research Center MilwaukeeWIUSA.

Platelets are small, versatile blood cells that are critical for hemostasis/thrombosis. Local platelet accumulation is a known contributor to proinflammation in various disease states. However, the anti-inflammatory/immunosuppressive potential of platelets has been poorly explored. Here, we uncovered, unexpectedly, desialylated platelets (dPLts) down-regulated immune responses against both platelet-associated and -independent antigen challenges. Utilizing multispectral photoacoustic tomography, we tracked dPLt trafficking to gut vasculature and an exclusive Kupffer cell-mediated dPLt clearance in the liver, a process that we identified to be synergistically dependent on platelet glycoprotein Ibα and hepatic Ashwell–Morell receptor. Mechanistically, Kupffer cell clearance of dPLt potentiated a systemic immunosuppressive state with increased anti-inflammatory cytokines and circulating CD4+ regulatory t cells, abolishable by Kupffer cell depletion. Last, in a clinically relevant model of hemophilia A, presensitization with dPLt attenuated anti-factor VIII antibody production after factor VIII ( infusion. As platelet desialylation commonly occurs in daily-aged and activated platelets, these findings open new avenues toward understanding immune homeostasis and potentiate the therapeutic potential of dPLt and engineered dPLt transfusions in controlling autoimmune and alloimmune diseases.

关键词： Platelet transfusion homeostasis

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Experimental and analytical investigation on friction resistance force between buried coated pressurized steel pipes and soil

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Frontiers of Structural and Civil Engineering 2024年第4期18卷 615-629页

作者： Shaurav ALAM tanvir MANZUR john MAttHEwS Chris BARtLEtt Erez ALLOUCHE Brent KEIL john KRAFt Department of Civil Engineering and Construction Engineering technology Louisiana Tech UniversityRustonLA 71270USA Department of Civil Engineering Bangladesh University of Engineering and TechnologyDhaka 1000Bangladesh Georgia tech Research Institute AtlantaGA 30332USA Stantec Inc. Edmonton T5J0K4Canada North west Pipe Company VancouverWA 98684USA

this paper presents an analytical approach for estimating frictional resistance to pipe movement at soil and external pipe surface of buried coated pressurized steel pipes relative to the internal thrust *** proposed analytical method was developed based on 36 experiments,which involved three coating types(cement mortar(CM),polyurethane type-I(Pt-I),prefabricated plastic tape(PPt))on pipes’surfaces,three different soils(pea-gravel(PG),sand(S),silty-clay(SC)),and four simulated over burden depths above the pipe’s *** showed frictional resistance decreased with increasing over burden depth above the pipe’s *** degree of frictional resistance at the pipe-soil interface was found to be in the order of PG>SC>S for all coating variations and overburden *** coated pipe buried in all three types of soil produced significantly higher frictional resistance as compared to other coating *** on experimental data,the developed analytical introduced a dimensionless factor“Z”,which included effects of types of coatings,soil,and overburden depths for simplified rapid *** showed that the method provided a better prediction of frictional resistance forces,in comparison to previous analytical methods,which were barely close in predicting friction resistance for different coating variations,soil types,and overburden *** resistance force values reported herein could be considered conservative.

关键词： friction resistance force thrust force coated pressurized steel pipe soil type overburden depth

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