keyword
MENU ▼
Read by QxMD icon Read
search

Piezoelectric

keyword
https://www.readbyqxmd.com/read/28230796/a-sensor-data-fusion-system-based-on-k-nearest-neighbor-pattern-classification-for-structural-health-monitoring-applications
#1
Jaime Vitola, Francesc Pozo, Diego A Tibaduiza, Maribel Anaya
Civil and military structures are susceptible and vulnerable to damage due to the environmental and operational conditions. Therefore, the implementation of technology to provide robust solutions in damage identification (by using signals acquired directly from the structure) is a requirement to reduce operational and maintenance costs. In this sense, the use of sensors permanently attached to the structures has demonstrated a great versatility and benefit since the inspection system can be automated. This automation is carried out with signal processing tasks with the aim of a pattern recognition analysis...
February 21, 2017: Sensors
https://www.readbyqxmd.com/read/28227949/wrist-worn-heartbeat-monitoring-system-based-on-bio-impedance-analysis
#2
Jia Xu, Xiaomeng Gao, Alexander Lee, Shuhei Yamada, Ehsan Yavari, Victor Lubecke, Olga Boric-Lubecke, Jia Xu, Xiaomeng Gao, Alexander Lee, Shuhei Yamada, Ehsan Yavari, Victor Lubecke, Olga Boric-Lubecke, Olga Boric-Lubecke, Xiaomeng Gao, Shuhei Yamada, Ehsan Yavari, Jia Xu, Victor Lubecke, Alexander Lee
In this paper, a bio-impedance analysis (BIA) based wrist-worn heartbeat monitoring system is proposed. The system is able to estimate heart rate from a subject's wrist with only four electrodes. The design is achieved with a standard BIA device and off-the-shelf components for signal conditioning. The measured heartbeat-related impedance signal is compared with a reference heart rate signal obtained from piezoelectric finger pulse transducer. The BIA results agree with the reference, which validates the feasibility of the proposed system...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227794/a-numerical-and-experimental-study-of-acoustic-micromixing-in-3d-microchannels-for-lab-on-a-chip-devices
#3
Susana O Catarino, Vania C Pinto, Paulo J Sousa, Rui Lima, Joao M Miranda, Graca Minas, Susana O Catarino, Vania C Pinto, Paulo J Sousa, Rui Lima, Joao M Miranda, Graca Minas, Joao M Miranda, Paulo J Sousa, Susana O Catarino, Rui Lima, Vania C Pinto, Graca Minas
This paper reports a numerical and experimental study of acoustic streaming and micromixing in polydimethylsiloxane microchannels. The mixing between two fluids flowing in microchannels was evaluated through the following conditions: (1) using a 28 μm thick β-poly(vinylidene fluoride) (β-PVDF) as a piezoelectric transducer actuated with a 24 Vpp and 40 MHz sinusoidal voltage; (2) using different flow rates. The results suggest that the mixing length increases as the flow rate increases and that the acoustic streaming phenomenon leads to a reduction on the mixing length...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227617/detection-of-chewing-from-piezoelectric-film-sensor-signals-using-ensemble-classifiers
#4
Muhammad Farooq, Edward Sazonov, Muhammad Farooq, Edward Sazonov, Muhammad Farooq, Edward Sazonov
Selection and use of pattern recognition algorithms is application dependent. In this work, we explored the use of several ensembles of weak classifiers to classify signals captured from a wearable sensor system to detect food intake based on chewing. Three sensor signals (Piezoelectric sensor, accelerometer, and hand to mouth gesture) were collected from 12 subjects in free-living conditions for 24 hrs. Sensor signals were divided into 10 seconds epochs and for each epoch combination of time and frequency domain features were computed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227590/elastic-ribbon-like-piezoelectric-energy-harvester-for-wearable-devices-with-stretchable-surfaces
#5
You Liang Lionel, Wong, Gary K Fedder, You Liang Lionel, Wong, Gary K Fedder
This paper presents an elastic ribbon-like piezoelectric energy harvester which is targeted for skin-wearable devices by harnessing the movements of stretchable surfaces. The device aims to power up smart thin stick-on devices for healthcare monitoring. By embedding a ribbon-like PVDF film in a flexible elastomer, Ecoflex, the device is potentially able to stretch 34%, while maintaining internal strain of the film below its plastic deformation limit. Alternate electrode layout and bimorph configuration help to reduce charge cancellation, while increasing overall effectiveness...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226999/acoustic-emission-and-angular-movement-variations-from-early-adulthood-healthy-knees-to-late-adulthood-osteoarthritic-knees
#6
Lik-Kwan Shark, Hongzhi Chen, Wei Quan, John Goodacre, Lik-Kwan Shark, Hongzhi Chen, Wei Quan, John Goodacre, Hongzhi Chen, Wei Quan, Lik-Kwan Shark, John Goodacre
From sit-stand-sit movements performed by healthy and osteoarthritic knees in three different age bands, this paper presents the investigation of the relationship between joint angular movement measured using electro-goniometers and acoustic emission measured using piezoelectric sensors. By partitioning joint movement in each sit-stand-sit cycle into sub-movement phases based on ascending and descending as well as acceleration and deceleration, the statistical analysis reveals aged and osteoarthritic knees exhibiting increased asymmetry and more variable angular movement compared with young and age-matched healthy knees, particularly in the descending-deceleration phase...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226485/testing-and-comparing-of-film-type-sensor-materials-in-measurement-of-plantar-pressure-distribution
#7
Satu Rajala, Timo Salpavaara, Sampo Tuukkanen, Satu Rajala, Timo Salpavaara, Sampo Tuukkanen, Satu Rajala, Sampo Tuukkanen, Timo Salpavaara
Simple in-shoe sensors based on film-type sensor materials were developed in this study. Three sensor materials were tested: polyvinylidenefluoride (PVDF), cellulose nanofibrils (CNF) and ElectroMechanical Film (EMFi). Plantar pressure distributions of a subject were measured with the developed in-shoe sensors; each consisting of three sensor channels (lateral and medial metatarsal heads and heel). In addition, piezoelectric sensor sensitivities and crosstalk between the sensor channels were determined. Differences between the tested film-type materials and measured plantar pressure distribution signals were studied...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225123/switchable-3-0-magnetoelectric-nanocomposite-thin-film-with-high-coupling
#8
Austin McDannald, Linghan Ye, Claudia Cantoni, Sreenivasulu Gollapudi, Gopalan Srinivasan, Bryan D Huey, Menka Jain
A mixed precursor solution method was used to deposit 3-0 nanocomposite thin films of PbZr0.52Ti0.48O3 (PZT) and CoFe2O4 (CFO). The piezoelectric behavior of PZT and magnetostrictive behavior of CFO allow for magnetoelectric (ME) coupling through strain transfer between the respective phases. High ME coupling is desired for many applications including memory devices, magnetic field sensors, and energy harvesters. The spontaneous phase separation in the 3-0 nanocomposite film was observed, with 25 nm CFO particle or nanophases distributed in discrete layers through the thickness of the PZT matrix...
February 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28223015/surgical-management-of-ankyloses-of-the-temporomandibular-joint-by-a-piezoelectric-device
#9
Giuseppe Spinelli, Domenico Valente, Giuditta Mannelli, Mirco Raffaini, Francesco Arcuri
INTRODUCTION: Piezosurgery is commonly used in different field of craniomaxillofacial surgery; since its introduction it has become one of the widely adopted technique for performing osteotomies in orthognathic surgery, distraction osteogenesis and dentoalveolar surgery. Little has been written regarding ultrasonic system for temporomandibular joint surgery (TMJ). In this prospective study we describe the use of piezoelectric device for ankylosis of the TMJ. MATERIALS AND METHODS: We enrolled in this study 19 patients, 10 males and 9 females, mean (SD) age 24...
December 18, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28218673/a-high-performance-piezoelectric-sensor-for-dynamic-force-monitoring-of-landslide
#10
Ming Li, Wei Cheng, Jiangpan Chen, Ruili Xie, Xiongfei Li
Due to the increasing influence of human engineering activities, it is important to monitor the transient disturbance during the evolution process of landslide. For this purpose, a high-performance piezoelectric sensor is presented in this paper. To adapt the high static and dynamic stress environment in slope engineering, two key techniques, namely, the self-structure pressure distribution method (SSPDM) and the capacitive circuit voltage distribution method (CCVDM) are employed in the design of the sensor...
February 17, 2017: Sensors
https://www.readbyqxmd.com/read/28218519/probing-the-dynamic-interaction-between-damaged-dna-and-a-cellular-responsive-protein-using-a-piezoelectric-mass-biosensor
#11
Yulong Jin, Yunfeng Xie, Kui Wu, Yanyan Huang, Fuyi Wang, Rui Zhao
The binding events between damaged DNA and recognition biomolecules are of great interest for understanding of the activity of DNA-damaging drugs and the related DNA repair networks. Herein, a simple and sensitive sensor system was tailored for real-time probing the dynamic molecular recognition between cisplatin-damaged DNA (cisPt-DNA) and a cellular responsive protein, high mobility group box 1 (HMGB1). By integrating of flow injection analysis (FIA) with quartz crystal microbalance (QCM), the interaction time-course of cisPt-DNA and HMGB1 domain A (HMGB1a) was investigated...
February 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28217063/ultrasound-guided-probe-generated-artifacts-stimulating-ventricular-tachycardia-a-rare-phenomenon
#12
Rafat Shamim, Rudrashish Haldar, Ashutosh Kaushal
Electrocardiographic (ECG) artifacts may arise due to interference, faulty earthing, and current leakages in biomedical equipment which might create clinical dilemmas in the perioperative settings. Piezoelectric signals generated by ultrasonography probe are another uncommon source which might be sensed by the ECG electrodes and produce tracings similar to pathological arrhythmias triggering false alarms and avoidable therapies. Anesthesiologists should be familiar with these uncommon sources which might produce these artifacts and they should be identified swiftly...
January 2017: Saudi Journal of Anaesthesia
https://www.readbyqxmd.com/read/28211675/synthesis-of-orthorhombic-perovskite-type-znsno3-single-crystal-nanoplates-and-their-application-in-energy-harvesting
#13
Runjiang Guo, Yiping Guo, Huanan Duan, Hua Li, Hezhou Liu
In recent years, the lead-free piezoelectric nanogenerators have attracted much attention, because of their great potential for harvesting energy from our environment. Here, we report on the first synthesis of two-dimensional (2D) single crystal ZnSnO3 hexagon nanoplates and fabrication of nanogenerators based on the single crystal ZnSnO3 nanoplates. The orthorhombic perovskite structured ZnSnO3 nanoplates with the (111) facets exposed at the surface of the plates are successfully synthesized via a one-step hydrothermal reaction...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211622/mri-guided-focused-ultrasound-robotic-system-for-animal-experiments
#14
Marinos Yiannakou, Georgios Menikou, Christos Yiallouras, Cleanthis Ioannides, Christakis Damianou
BACKGROUND: In this paper an MRI-guided focused ultrasound (MRgFUS) robotic system was developed that can be used for conducting experiments in small animals.The target for this robotic system regarding motion was to move a therapeutic ultrasound transducer in two Cartesian axes. METHODS: A single element spherically focused transducer of 3 cm diameter, focusing at 7 cm and operating at 0.4 MHz was used. The positioning device incorporates only MRI compatible materials...
February 17, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28211510/broadband-gradient-impedance-matching-using-an-acoustic-metamaterial-for-ultrasonic-transducers
#15
Zheng Li, Dan-Qing Yang, Shi-Lei Liu, Si-Yuan Yu, Ming-Hui Lu, Jie Zhu, Shan-Tao Zhang, Ming-Wei Zhu, Xia-Sheng Guo, Hao-Dong Wu, Xin-Long Wang, Yan-Feng Chen
High-quality broadband ultrasound transducers yield superior imaging performance in biomedical ultrasonography. However, proper design to perfectly bridge the energy between the active piezoelectric material and the target medium over the operating spectrum is still lacking. Here, we demonstrate a new anisotropic cone-structured acoustic metamaterial matching layer that acts as an inhomogeneous material with gradient acoustic impedance along the ultrasound propagation direction. When sandwiched between the piezoelectric material unit and the target medium, the acoustic metamaterial matching layer provides a broadband window to support extraordinary transmission of ultrasound over a wide frequency range...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210188/non-contact-photoacoustic-imaging-using-a-commercial-heterodyne-interferometer
#16
Chao Tian, Ting Feng, Cheng Wang, Shengchun Liu, Qian Cheng, David E Oliver, Xueding Wang, Guan Xu
Most current photoacoustic imaging (PAI) systems employ piezoelectric transducers to receive photoacoustic signals, which requires coupling medium to facilitate photoacoustic wave propagation and are not favored in many applications. Here, we report an all-optical non-contact PAI system based on a commercial heterodyne interferometer working at 1550 nm. The interferometer remotely detects ultrasound-induced surface vibration and does not involve any physical contact with the sample. The theoretically predicated and experimentally measured noise equivalent detection limits of the optical sensor are about 4...
December 1, 2016: IEEE Sensors Journal
https://www.readbyqxmd.com/read/28208693/a-miniature-magnetic-force-based-three-axis-ac-magnetic-sensor-with-piezoelectric-vibrational-energy-harvesting-functions
#17
Chiao-Fang Hung, Po-Chen Yeh, Tien-Kan Chung
In this paper, we demonstrate a miniature magnetic-force-based, three-axis, AC magnetic sensor with piezoelectric/vibrational energy-harvesting functions. For magnetic sensing, the sensor employs a magnetic-mechanical-piezoelectric configuration (which uses magnetic force and torque, a compact, single, mechanical mechanism, and the piezoelectric effect) to convert x-axis and y-axis in-plane and z-axis magnetic fields into piezoelectric voltage outputs. Under the x-axis magnetic field (sine-wave, 100 Hz, 0.2-3...
February 8, 2017: Sensors
https://www.readbyqxmd.com/read/28208625/development-of-a-hybrid-piezo-natural-rubber-piezoelectricity-and-piezoresistivity-sensor-with-magnetic-clusters-made-by-electric-and-magnetic-field-assistance-and-filling-with-magnetic-compound-fluid
#18
Kunio Shimada, Norihiko Saga
Piezoelements used in robotics require large elasticity and extensibility to be installed in an artificial robot skin. However, the piezoelements used until recently are vulnerable to large forces because of the thin solid materials employed. To resolve this issue, we utilized a natural rubber and applied our proposed new method of aiding with magnetic and electric fields as well as filling with magnetic compound fluid (MCF) and doping. We have verified the piezoproperties of the resulting MCF rubber. The effect of the created magnetic clusters is featured in a new two types of multilayered structures of the piezoelement...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28208583/effect-of-the-matching-circuit-on-the-electromechanical-characteristics-of-sandwiched-piezoelectric-transducers
#19
Shuyu Lin, Jie Xu
The input electrical impedance behaves as a capacitive when a piezoelectric transducer is excited near its resonance frequency. In order to increase the energy transmission efficiency, a series or parallel inductor should be used to compensate the capacitive impedance of the piezoelectric transducer. In this paper, the effect of the series matching inductor on the electromechanical characteristics of the piezoelectric transducer is analyzed. The dependency of the resonance/anti-resonance frequency, the effective electromechanical coupling coefficient, the electrical quality factor and the electro-acoustical efficiency on the matching inductor is obtained...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28199732/a-systematic-review-of-novel-technology-for-monitoring-infant-and-newborn-heart-rate
#20
REVIEW
Ajay C Kevat, Denise Vr Bullen, Peter G Davis, C Omar F Kamlin
: Heart rate is a vital sign for assessing the need for resuscitation. We performed a systematic review of studies assessing novel methods of measuring heart rate in newborns and infants in the neonatal unit. Two investigators completed independent literature searches. Identified papers were independently evaluated and relevant data were extracted and analysed. CONCLUSION: This systematic review identified seven new technologies, including camera-based photoplethysmography, reflectance pulse oximetry, laser Doppler methods, capacitive sensors, piezoelectric sensors, electromyography, and a digital stethoscope...
February 15, 2017: Acta Paediatrica
keyword
keyword
26330
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"