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https://www.readbyqxmd.com/read/28226720/comparison-of-viscoelastic-property-characterization-of-plastisol-phantoms-with-magnetic-resonance-elastography-and-high-frequency-rheometry
#1
P M Lefebvre, K Tse Ve Koon, E Brusseau, S Nicolle, J-F Palieme, S A Lambert, D Grenier, P M Lefebvre, K Tse Ve Koon, E Brusseau, S Nicolle, J-F Palieme, S A Lambert, D Grenier, P M Lefebvre, E Brusseau, S Nicolle, D Grenier, S A Lambert
This study aims at evaluating Magnetic Resonance Elastography (MRE) as a reliable technique for the characterization of viscoelastic properties of soft tissues. Three phantoms with different concentrations of plastisol and softener were prepared in order to mechanically mimic a broad panel of healthy and pathological soft tissues. Once placed in a MRI device, each sample was excited by a homemade external driver, inducing shear waves within the medium. The storage (G') and loss (G") moduli of each phantom were then reconstructed from MRE acquisitions over a frequency range from 300 to 1,000 Hz, by applying a 2D Helmholtz inversion algorithm...
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
#2
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
#3
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/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
#4
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/28164706/mechanical-stimulation-of-piezo1-receptors-depends-on-extracellular-matrix-proteins-and-directionality-of-force
#5
Benjamin M Gaub, Daniel J Müller
Piezo receptors convert mechanical forces into electrical signals. In mammals, they play important roles in basic physiological functions including proprioception, sensation of touch and vascular development. However, basic receptor properties like the gating mechanism, the interaction with extracellular matrix (ECM) proteins and the response to mechanical stimulation, remain poorly understood. Here, we establish an atomic force microscopy (AFM)-based assay to mechanically stimulate Piezo1 receptors in living animal cells, while monitoring receptor activation in real-time using functional calcium imaging...
February 6, 2017: Nano Letters
https://www.readbyqxmd.com/read/28160577/the-effects-of-surgical-preparation-techniques-and-implant-macro-geometry-on-primary-stability-an-in-vitro-study
#6
G Falisi, M Severino, C Rastelli, S Bernardi, S Caruso, M Galli, L Lamazza, C Di Paolo
BACKGROUND: The attainment of a good primary stability is a necessary condition to ensure the success of osseointegration in implantology. In type IV cancellous bone, however, it is possible that a reduced primary stability can lead to an increased rate of failure. The aim of this study was therefore to determine, with the help of the resonance frequency (Osstell mentor), which technique of implant site preparation (piezo surgery, conventional, under-preparation, bone compaction, osteodistraction) and macro-geometry is able to improve implant stability in type IV cancellous bone...
February 4, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28147654/radiation-pressure-excitation-of-a-low-temperature-atomic-force-magnetic-force-microscope-for-imaging-in-4-300-k-temperature-range
#7
Ümit Çelik, Özgür Karcı, Yiğit Uysallı, H Özgür Özer, Ahmet Oral
We describe a novel radiation pressure based cantilever excitation method for imaging in dynamic mode atomic force microscopy (AFM) for the first time. Piezo-excitation is the most common method for cantilever excitation, however it may cause spurious resonance peaks. Therefore, the direct excitation of the cantilever plays a crucial role in AFM imaging. A fiber optic interferometer with a 1310 nm laser was used both for the excitation of the cantilever at the resonance and the deflection measurement of the cantilever in a commercial low temperature atomic force microscope/magnetic force microscope (AFM/MFM) from NanoMagnetics Instruments...
January 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28114046/sleep-apnea-detection-based-on-thoracic-and-abdominal-movement-signals-of-wearable-piezo-electric-bands
#8
Yin-Yan Lin, Hau-Tieng Wu, Chi-An Hsu, Po-Chiun Huang, Yuan-Hao Huang, Yu-Lun Lo
Physiologically, the thoracic (THO) and abdominal (ABD) movement signals, captured using wearable piezo-electric bands, provide information about various types of apnea, including central sleep apnea (CSA) and obstructive sleep apnea (OSA). However, the use of piezo-electric wearables in detecting sleep apnea events has been seldom explored in the literature. This study explored the possibility of identifying sleep apnea events, including OSA and CSA, by solely analyzing one or both the THO and ABD signals...
December 7, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28114035/battery-free-smart-sock-for-abnormal-relative-plantar-pressure-monitoring
#9
Xiaoyou Lin, Boon-Chong Seet
This paper presents a new design of a wearable plantar pressure monitoring system in the form of a smart sock for sensing abnormal relative pressure changes. One advantage of this approach is that with a battery-free design, this system can be powered solely by radio frequency (RF) energy harvested from a radio frequency identification (RFID) reader unit hosted on a smartphone of the wearer. At the same time, this RFID reader can read foot pressure values from an embedded sensor-tag in the sock. A pressure sensing matrix made of conductive fabric and flexible piezo-resistive material is integrated into the sock during the knitting process...
December 5, 2016: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28105394/piezo-phototronic-effect-enhanced-flexible-solar-cells-based-on-n-zno-p-sns-core-shell-nanowire-array
#10
Laipan Zhu, Longfei Wang, Fei Xue, Libo Chen, Jianqiang Fu, Xiaolong Feng, Tianfeng Li, Zhong Lin Wang
The piezo-phototronic effect is about the enhanced separation, transport, and recombination of the photogenerated carriers using the piezoelectric polarization charges present in piezoelectric-semiconductor materials. Here, it is presented that the piezo-phototronic effect can be effectively applied to improve the relative conversion efficiency of a flexible solar cell based on n-ZnO/p-SnS core-shell nanowire array for 37.3% under a moderate vertical pressure. The performance of the solar cell can be effectively enhanced by a gentle bending of the device, showing its potential for application in curly geometries...
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28062204/impact-of-formulation-properties-and-process-parameters-on-the-dispensing-and-depositioning-of-drug-nanosuspensions-using-micro-valve-technology
#11
Bastian Bonhoeffer, Arno Kwade, Michael Juhnke
Flexible manufacturing processes with continuously adjustable dose strengths are considered particularly innovative and interesting for applications in personalized medicine, continuous manufacturing or early drug development. A piezo-actuated micro-valve has been investigated for the dispensing and depositioning of drug nanosuspensions onto substrates to facilitate the manufacturing of solid oral dosage forms. The investigated micro-valve has been characterized regarding dispensing behavior, mass flow, accuracy and robustness...
January 3, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28059277/photoelastic-properties-of-lithium-tetraborate-crystals
#12
Oleh Krupych, Oksana Mys, Taras Kryvyy, Volodymyr Adamiv, Yaroslav Burak, Rostyslav Vlokh
We report the results of comprehensive studies of the piezo-optic and elasto-optic effects in lithium tetraborate crystals, Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>. The full matrices of piezo-optic and elasto-optic coefficients are obtained using a recently developed method based on four-point bending. On this basis, we have estimated the acousto-optic figure of merit for Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>.
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28050988/comparative-study-of-piezoelectric-and-rotary-osteotomy-technique-for-third-molar-impaction
#13
Sulphi A Basheer, R Jay Govind, Augustine Daniel, George Sam, V J Adarsh, Akshatha Rao
INTRODUCTION: Bone removal is necessary for extracting the third molars that are erupted, partially erupted, and/or impacted in bone. Hence, it is necessary to choose a surgical method or instruments that conform to anatomic landmarks and are based on physiological principles. Many authors have reported injuries to the adjacent tooth, especially the distal part of periodontium after removal of second molar. Hence, the present study was undertaken to assess and compare the surgical and postsurgi-cal outcomes of third molar removal using piezoelectric surgery and rotary bur...
January 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28050644/difference-in-nacl-tolerance-of-membrane-bound-5-nucleotidases-purified-from-deep-sea-and-brackish-water-shewanella-species
#14
Taka-Aki Kuribayashi, Sotaro Fujii, Misa Masanari, Masaru Yamanaka, Satoshi Wakai, Yoshihiro Sambongi
Shewanella species are widely distributed in sea, brackish, and fresh water areas, growing psychrophilically or mesophilically, and piezophilically or piezo-sensitively. Here, membrane-bound 5'-nucleotidases (NTases) from deep-sea Shewanella violacea and brackish water Shewanella amazonensis were examined from the aspect of NaCl tolerance to gain an insight into protein stability against salt. Both NTases were single polypeptides with molecular masses of ~59 kDa, as determined on mass spectroscopy. They similarly required 10 mM MgCl2 for their activities, and they exhibited the same pH dependency and substrate specificity for 5'-nucleotides...
January 3, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28048129/su-f-i-15-evaluation-of-a-new-mr-compatible-respiratory-motion-device-at-3t
#15
A Soliman, B Chugh, B Keller, A Sahgal, W Song
PURPOSE: Recent advances in MRI-guided radiotherapy has inspired the development of MRI-compatible motion devices that simulate patient periodic motion in the scanner, particularly respiratory motion. Most commercial devices rely on non MR-safe ferromagnetic stepper motors which are not practical for regular QA testing. This work evaluates the motion performance of a new fully MRI compatible respiratory motion device at 3T. METHODS: The QUASAR™ MRI-compatible respiratory motion phantom has been recently developed by Modus QA Inc...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044050/piezo2-a-candidate-biomarker-for-visceral-hypersensitivity-in-irritable-bowel-syndrome
#16
Tao Bai, Ying Li, Jing Xia, Yudong Jiang, Lei Zhang, Huan Wang, Wei Qian, Jun Song, Xiaohua Hou
Background/Aim: Currently, there exists no biomarker for visceral hypersensitivity in Irritable Bowel Syndrome (IBS). Piezo proteins have been proven to play an important role in the mechanical stimulation to induce visceral pain in other tissues and may also be a biomarker candidate. The aim of this study was to test the expressions of Piezo1 and Piezo2 proteins in the intestinal epithelial cells from different intestinal segments and to explore the correlation between Piezo proteins expression and visceral pain threshold...
January 2, 2017: Journal of Neurogastroenterology and Motility
https://www.readbyqxmd.com/read/28040942/an-ultra-low-noise-high-voltage-piezo-driver
#17
N C Pisenti, A Restelli, B J Reschovsky, D S Barker, G K Campbell
We present an ultra-low noise, high-voltage driver suited for use with piezoelectric actuators and other low-current applications. The architecture uses a flyback switching regulator to generate up to 250 V in our current design, with an output of 1 kV or more possible with small modifications. A high slew-rate op-amp suppresses the residual switching noise, yielding a total root-mean-square noise of ≈100 μV (1 Hz-100 kHz). A low-voltage (±10 V), high bandwidth signal can be summed with unity gain directly onto the output, making the driver well-suited for closed-loop feedback applications...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28040915/a-sub-ms-pressure-jump-setup-for-time-resolved-x-ray-scattering
#18
Johannes Möller, Joachim Léonardon, Jacques Gorini, Rajeev Dattani, Theyencheri Narayanan
We present a new experimental setup for time-resolved solution small-angle X-ray scattering (SAXS) studies of kinetic processes induced by sub-ms hydrostatic pressure jumps. It is based on a high-force piezo-stack actuator, with which the volume of the sample can be dynamically compressed. The presented setup has been designed and optimized for SAXS experiments with absolute pressures of up to 1000 bars, using transparent diamond windows and an easy-to-change sample capillary. The pressure in the cell can be changed in less than 1 ms, which is about an order of magnitude faster jump than previously obtained by dynamic pressure setups for SAXS...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28039570/different-transcriptional-profiling-between-senescent-and-non-senescent-human-coronary-artery-endothelial-cells-hcaecs-by-omeprazole-and-lansoprazole-treatment
#19
Laura Costarelli, Robertina Giacconi, Marco Malavolta, Andrea Basso, Francesco Piacenza, Mauro Provinciali, Marcello G Maggio, Andrea Corsonello, Fabrizia Lattanzio
Recent evidence suggests that high dose and/or long term use of proton pump inhibitors (PPIs) may increase the risk of adverse cardiovascular events in older patients, but mechanisms underlying these detrimental effects are not known. Taking into account that the senescent endothelial cells have been implicated in the genesis or promotion of age-related cardiovascular disease, we hypothesized an active role of PPIs in senescent cells. The aim of this study is to investigate the changes in gene expression occurring in senescent and non-senescent human coronary artery endothelial cells (HCAECs) following Omeprazole (OPZ) or Lansoprazole (LPZ) treatment...
December 30, 2016: Biogerontology
https://www.readbyqxmd.com/read/28024322/enhanced-luminescence-performance-of-quantum-wells-by-coupling-piezo-phototronic-with-plasmonic-effects
#20
Xin Huang, Chunyan Jiang, Chunhua Du, Liang Jing, Mengmeng Liu, Weiguo Hu, Zhong Lin Wang
With a promising prospect of light-emitting diodes as an attractive alternative to conventional light sources, remaining challenges still cannot be addressed owing to their limited efficiency. Among the continued scientific efforts, significant improvement on the emission efficiency has been achieved via either piezo-phototronic effect-based strain modulation or resonant excitation of plasmons in metallic nanostructures. Here, we present the investigation on the coupling process between piezo-phototronic effect and localized surface plasmonic resonance for enhancing the photoluminescence of InGaN/GaN quantum wells coated with Ag nanoparticles...
December 27, 2016: ACS Nano
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