A5014321317- Advanced MEMS and NEMS Technologies
- Mechanical and Optical Resonators
- Acoustic Wave Resonator Technologies
- Advanced Fiber Optic Sensors
- Advanced Sensor and Energy Harvesting Materials
- Photoacoustic and Ultrasonic Imaging
- Ultrasonics and Acoustic Wave Propagation
- Blood Pressure and Hypertension Studies
- Hormonal Regulation and Hypertension
- Non-Invasive Vital Sign Monitoring
- Complex Network Analysis Techniques
- Muscle activation and electromyography studies
- Cardiovascular Health and Disease Prevention
- Electrical and Bioimpedance Tomography
- Modular Robots and Swarm Intelligence
- Heart Rate Variability and Autonomic Control
- Neural Networks and Applications
- Fuzzy Logic and Control Systems
- Cardiovascular Disease and Adiposity
- Advanced Computational Techniques and Applications
- Pulmonary Hypertension Research and Treatments
- Gas Sensing Nanomaterials and Sensors
- Cardiovascular Function and Risk Factors
- Geophysics and Sensor Technology
- Flow Measurement and Analysis
Zhejiang University
2015-2025
Southern Medical University
2023
Nanfang Hospital
2023
University of California, San Diego
2021-2023
The University of Texas at Austin
2023
Nanjing University of Science and Technology
2023
University of California, Berkeley
2018-2021
Target (United States)
2021
Lanzhou University
2018-2020
Lanzhou University Second Hospital
2018-2020
Serial assessment of the biomechanical properties tissues can be used to aid early detection and management pathophysiological conditions, track evolution lesions evaluate progress rehabilitation. However, current methods are invasive, only for short-term measurements, or have insufficient penetration depth spatial resolution. Here we describe a stretchable ultrasonic array performing serial non-invasive elastographic measurements up 4 cm beneath skin at resolution 0.5 mm. The conforms human...
Abstract Electronic patches, based on various mechanisms, allow continuous and noninvasive monitoring of biomolecules the skin surface. However, to date, such devices are unable sense in deep tissues, which have a stronger faster correlation with human physiological status than those Here, we demonstrate photoacoustic patch for three-dimensional (3D) mapping hemoglobin tissues. This integrates an array ultrasonic transducers vertical-cavity surface-emitting laser (VCSEL) diodes common soft...
The high degree of freedom (DoF) shape morphing widely exists in biology for mimicry, camouflage, and locomotion. Currently, a lot bionic soft/flexible actuators robots with shape-morphing functions have been developed to realize conformity, grasp, movement. Among these solutions, two-dimensional responsive materials structures that can morph into different three-dimensional configurations are valuable creating reversible DoF morphing. However, most existing methods predetermined through the...
This paper presents a high accuracy air-coupled reflective ultrasonic rangefinder based on piezoelectric micromachined transducers (pMUTs) using multi-frequency continuous waves (MFCWs). Two pieces of 5 times AlN pMUTs arrays at the resonant frequency 492 kHz are employed to transmit and receive signals, respectively. The MFCW method, where distance information is calculated from phase difference, can cancel out random noise in numerous repeating periods. Therefore, high-accuracy range...
This paper presents a design and experimental evaluation of micro-electro-mechanical system biaxial resonant accelerometer with two-stage microleverage mechanisms. The device incorporates two pairs double-ended tuning fork resonators coupled to single proof mass. mechanisms possess higher amplification factor than single-stage mechanisms, so that the proposed has high level sensitivity. In addition, low cross-axis sensitivity is realized because decoupling beams. theoretically analyzed then...
This letter describes a blood flowmeter by the pulsed wave Doppler (PWD) ultrasound detection procedure utilizing piezoelectric micromachined ultrasonic transducers (pMUTs) with aluminum nitride (AlN) film as material. The transceiver electronics for PWD scheme are constructed system control and signal processing, blood-mimicking fluid (BMF) is synthesized flow velocity tests. Both average frequency-shift power spectrum density (PSD) shift respect to have been characterized validated,...
Abstract Most of current portable B-mode medical imaging is based on traditional ultrasonic transducers (UTs) or capacitive micromachined UTs, both them have defects that impede satisfying performance. Piezoelectric UTs (pMUTs) a promising solution for portable/wearable as alternative. This work demonstrates simulated muscle with an aluminum nitride (AlN) pMUT array application disorder diagnosis. A 23 × 26 resonant frequency 5 MHz (in oil) fabricated cavity silicon-on-insulator process. It...
This paper describes an electrostatic charge sensor based on a microelectromechanical systems (MEMS) resonator with dual micro-levers to improve sensitivity. The device comprises double-ended tuning fork resonant element working at out-of-phase mode quality factor (Q) of about 4900 under operating pressure 40 mTorr. frequency shifts in proportion axial force induced by additions and then transformed amplification over 8. measured responsivity is 1.3×10−3 Hz/fC2, which matches well the...
This paper reports a micro electromechanical system (MEMS) resonant accelerometer with high relative sensitivity based on sensing scheme of electrostatically-induced stiffness perturbation for the first time. The electrodes convert acceleration induced displacement proof masses to electrostatic force and cause effective frequency shift resonator. design structure dimensions application lower improve sensitivity, resulting in improvement sensitivity. is theoretically analyzed device...
This paper proposes a resonant accelerometer with sensitivity enhancement and adjustment mechanisms based on microelectromechanical systems (MEMS). Different from conventional accelerometers only enhanced by microleverage mechanisms, the proposed utilizes fishbone-shaped resonator as sensing element to enhance adjust sensitivity. The can realize mode selection frequency-tuning function according configuration of driving electrodes, so then different modes yields sensitivities. Experimental...
This paper reports a subcutaneous blood pressure (BP) monitoring system with AlN-based, piezoelectric micromachined ultrasonic transducers (PMUTs) on an ambulatory sheep. Compared to the state-of-art, three distinctive achievements have been demonstrated: (1) precision and continuous measurements of from diameter changes vessels as small 2.3 μm by means detections; (2) experimental validations in both vitro artery models acute animal study; (3) first silent without cuff toward fully...
A new micro fast-moving soft robot is investigated, which integrates a Polyvinylidene Fluoride (PVDF) actuator for actuation and two Electro Adhesive (EA) pads adhesion. An approach employing reverse-polarity voltage modulation introduced to counteract the residual adhesion caused by deactivation of EA pads. Several noteworthy features this are elucidated: (a) low power consumption 414 μW/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The ultrasonic images of muscle-like phantoms have been realized using dual-electrode bimorph (DEB) piezoelectric micromachined transducer (pMUT) arrays in this work. Ecoflex and polydimethylsiloxane (PDMS) are utilized to emulate normal disordered human muscles, respectively. DEB pMUTs constructed for both the emitter receiver functions generate acoustic waves with high intensity deep penetration clear echo signals. For images, A- B-mode scans implemented successfully detect three different...
In this paper, a microelectromechanical systems fishbone-shaped electrostatic double-ended tuning fork (DETF) resonator with selectable higher modes is presented. The can realize ten vibration resonant frequencies from 137.929 to 913.476 kHz and multi-mode selection function. Different conventional actuation methods, the proposed structure combined tooth-shaped electrode generates bending moment on beam leads of DETF. mode frequency be selected measured according configuration electrodes....
This paper reports a humidity sensor based on AlN surface acoustic wave (SAW) device coated with graphene oxide (GO) as sensing layer. Utilizing layered structure consisted of thin layer and highly doped Si substrate layer, the temperature coefficient frequency (TCF) is found to be around -22.1 ppm/°C, much smaller than conventional SAW sensors. Moreover, has wide detection range from 5% 95%RH shows high sensitivity up 420.8 kHz/10%RH at 90%RH. Little hysteresis, excellent repeatability,...
Objective: The aim of this study was to confirm the potential role testosterone in hypertension and target organ damage (TOD) hypertensive postmenopausal women. Methods: A matched group conducted. One hundred sixty-one women between 45 65 years age were enrolled as 1. Another 161 age-matched men 2. Ambulatory blood pressure monitoring, echocardiographic imaging, vascular function, sex hormones clinical characteristics evaluated. Quantitative data analyzed using independent Student’s t -test...
A 3.7 MHz piezoelectric micromachined ultrasonic transducer (pMUT) system based on the aluminum nitride (AlN) thin films has been developed to construct pulsed wave Doppler (PWD) ultrasound for wearable blood flow measurements. In emulation experiments, Nylon powder, surfactant, glycerinum and deionized (DI) water combined blood-mimicking fluid prepared PWD transceiver circuits are built signal processing. The effect shown that both average frequency power spectrum density (PSD) shift...
This study aimed to describe a peripherally inserted central catheterisation (PICC) for paediatric patients with inaccessible access and high risk of general anaesthesia (GA).This was retrospective observational involving all inpatients who performed the PICC via an EJV approach without GA between September 2014 2021 in provincial key clinical speciality.A total 290 line placement attempts were performed, 29 excluded due missing results, resulting sample size 261. The anatomical...
This paper firstly reports a MEMS (micro-electro-mechanical systems) biaxial resonant tilt sensor with two-stage microleverage mechanisms. Two pairs of double-ended tuning fork (DETF) resonators are the sensing elements and they integrated single proof mass. The mechanism possesses higher amplification factor than single-stage counterpart. For measurements, decoupling beams utilized to lower cross impact. proposed prototype has high sensitivity (X-axis: 4.351 Hz/deg Y-axis: 5.257 Hz/deg) low...
This paper reports a novel resonant electrometer with resolution of sub-1 femto coulomb, in which scheme adjustable sensitivity is firstly proposed to realize both high and large dynamic range. A double-ended tuning fork resonator utilized as the charge sensing element, an electrostatic comb-drive actuator used adjust sensitivity. The maximum was found be 1.03×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> Hz/fC...