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https://www.readbyqxmd.com/read/28345508/use-of-a-novel-portable-led-based-capillary-refill-time-simulator-within-a-disaster-triage-context
#1
Todd P Chang, Genevieve Santillanes, Ilene Claudius, Phung K Pham, James Koved, John Cheyne, Marianne Gausche-Hill, Amy H Kaji, Saranya Srinivasan, J Joelle Donofrio, Cynthia Bir
Introduction A simple, portable capillary refill time (CRT) simulator is not commercially available. This device would be useful in mass-casualty simulations with multiple volunteers or mannequins depicting a variety of clinical findings and CRTs. The objective of this study was to develop and evaluate a prototype CRT simulator in a disaster simulation context. METHODS: A CRT prototype simulator was developed by embedding a pressure-sensitive piezo crystal, and a single red light-emitting diode (LED) light was embedded, within a flesh-toned resin...
March 27, 2017: Prehospital and Disaster Medicine
https://www.readbyqxmd.com/read/28344735/parental-influences-and-the-relationship-to-their-children-s-physical-activity-levels
#2
Nathan A Chiarlitti, Angela M Kolen
Engaging in a physically active lifestyle relates positively to current health and reduces chances of chronic diseases in the future. Given escalating health care costs, it is paramount to reduce illnesses associated with a lack of physical activity and thus critical to identify factors that influence physical activity - especially in children, with the opportunity for a lifetime impact. One of these influencing factors may be parents/guardians. The intent of this study was to examine the relationship between children's physical activity levels and parental factors including parental physical activity, support/encouragement, restrictiveness, and self-reported participation...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28342875/the-nociception-genes-painless-and-piezo-are-required-for-the-cellular-immune-response-of-drosophila-larvae-to-wasp-parasitization
#3
Yumiko Tokusumi, Tsuyoshi Tokusumi, Robert A Schulz
In vertebrates, interaction between the nervous system and immune system is important to protect a challenged host from stress inputs from external sources. In this study, we demonstrate that sensory neurons are involved in the cellular immune response elicited by wasp infestation of Drosophila larvae. Multidendritic class IV neurons sense contacts from external stimuli and induce avoidance behaviors for host defense. Our findings show that inactivation of these sensory neurons impairs the cellular response against wasp parasitization...
March 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28324742/epithelial-homeostasis-a-piezo-of-the-puzzle
#4
Eugenia Piddini
A recent study shows that, upon stretching or wounding, epithelia display a fast proliferative response that allows for re-establishment of optimal cell density or sealing of the wound. This increased proliferation is induced by the stretch-activated channel Piezo1 and involves calcium-triggered ERK signalling.
March 20, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28323294/energy-harvesting-efficiency-in-gan-nanowire-based-nanogenerators-the-critical-influence-of-the-schottky-nanocontact
#5
Nicolas Jamond, Pascal Chrétien, Lina Gatilova, Elisabeth Galopin, Laurent Travers, Jean-Christophe Harmand, Frank Glas, Frédéric Houzé, Noëlle Gogneau
The performances of 1D-nanostructure based nanogenerators are governed by the ability of nanostructures to efficiently convert mechanical deformation into electrical energy, and by the efficiency with which this piezo-generated energy is harvested. In this paper, we highlight the crucial influence of the GaN nanowire-metal Schottky nanocontact on the energy harvesting efficiency. Three different metals, p-type doped diamond, PtSi and Pt/Ir, have been investigated. By using an atomic force microscope equipped with a Resiscope module, we demonstrate that the harvesting of piezo-generated energy is up to 2...
March 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28322301/flexible-wire-shaped-strain-sensor-from-cotton-thread-for-human-health-and-motion-detection
#6
Yuan-Qing Li, Pei Huang, Wei-Bin Zhu, Shao-Yun Fu, Ning Hu, Kin Liao
In this work, a wire-shaped flexible strain sensor was fabricated by encapsulating conductive carbon thread (CT) with polydimethylsiloxane (PDMS) elastomer. The key strain sensitive material, CT, was prepared by pyrolysing cotton thread in N2 atmosphere. The CT/PDMS composite wire shows a typical piezo-resistive behavior with high strain sensitivity. The gauge factors (GF) calculated at low strain of 0-4% and high strain of 8-10% are 8.7 and 18.5, respectively, which are much higher than that of the traditional metallic strain sensor (GF around 2)...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28321914/a-compact-0-5%C3%A2-t-mr-elastography-device-and-its-application-for-studying-viscoelasticity-changes-in-biological-tissues-during-progressive-formalin-fixation
#7
Jürgen Braun, Heiko Tzschätzsch, Clara Körting, Angela Ariza de Schellenberger, Marika Jenderka, Toni Drießle, Michael Ledwig, Ingolf Sack
PURPOSE: To develop a method of compact tabletop magnetic resonance elastography (MRE) for rheological tests of tissue samples and to measure changes in viscoelastic powerlaw constants of liver and brain tissue during progressive fixation. METHODS: A 10-mm bore, 0.5-T permanent-magnet-based MRI system was equipped with a gradient-amplifier-controlled piezo-actuator and motion-sensitive spin echo sequence for inducing and measuring harmonic shear vibrations in cylindrical samples...
March 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28321656/molecular-modeling-of-the-piezoelectric-properties-of-ferroelectric-composites-containing-polyvinylidene-fluoride-pvdf-and-either-graphene-or-graphene-oxide
#8
Vladimir S Bystrov, Igor K Bdikin, Maksim Silibin, Dmitry Karpinsky, Svitlana Kopyl, Ekaterina V Paramonova, Gil Goncalves
Molecular modeling of ferroelectric composites containing polyvinylidene fluoride (PVDF) and either graphene (G) or graphene oxide (GO) were performed using the semi-empirical quantum approximation PM3 in HyperChem. The piezo properties of the composites were analyzed and compared with experimental data obtained for P(VDF-TrFE)-GO films. Qualitative agreement was obtained between the results of the modeling and the experimental results in terms of the properties of the measured effective piezoelectric coefficient d 33eff and its decrease in the presence of G/GO in comparison with the average computed piezoelectric coefficient <d 33>...
April 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28321457/influence-of-piezotomy-and-osteoperforation-of-the-alveolar-process-on-the-rate-of-orthodontic-tooth-movement-a-systematic-review
#9
Stefan Hoffmann, Nikolaos Papadopoulos, Dominik Visel, Theresa Visel, Paul-Georg Jost-Brinkmann, Thomas Michael Präger
OBJECTIVE: The minimally invasive procedures piezosurgical corticocision and osteoperforation have been advocated as methods to accelerate orthodontic tooth movement and to shorten treatment time, but without large-scale trauma of the periosteum and the bone. The aim of this study was to evaluate if there is evidence supporting these claims based on a systematic review of the literature. MATERIALS AND METHODS: A search of PubMed and Google Scholar with the combined search terms "piezo*" and "tooth movement" was performed until May 2016...
March 20, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28306196/flexible-sensing-electronics-for-wearable-attachable-health-monitoring
#10
REVIEW
Xuewen Wang, Zheng Liu, Ting Zhang
Wearable or attachable health monitoring smart systems are considered to be the next generation of personal portable devices for remote medicine practices. Smart flexible sensing electronics are components crucial in endowing health monitoring systems with the capability of real-time tracking of physiological signals. These signals are closely associated with body conditions, such as heart rate, wrist pulse, body temperature, blood/intraocular pressure and blood/sweat bio-information. Monitoring such physiological signals provides a convenient and non-invasive way for disease diagnoses and health assessments...
March 17, 2017: Small
https://www.readbyqxmd.com/read/28278133/flat-panel-shaped-hybrid-piezo-triboelectric-nanogenerator-for-ambient-energy-harvesting
#11
Gul Hassan, Fasihullah Khan, Arshad Hassan, Shawkat Ali, Jinho Bae, Chong Hyun Lee
Recently, many researchers are paying attention to nanogenerators (NGs) as energy source in self-powered mirco-nano system, and studying how to achieve their higher power generation. Hence, we propose a hybrid type NG harvesting both piezoelectric and triboelectric effect at the same time. In the proposed hybrid NG, the piezoelectric NG (PNG) and triboelectric NG (TENG) are fabricated by Polydimethylsiloxane (PDMS) and perovskite Zinc stannite (ZnSnO<sub>3</sub>) nano cubes with a high charge polarization of 59 uC/cm<sup>2</sup> composite (PDMS+ZnSnO<sub>3</sub>) and UV surface treated PDMS, respectively...
March 9, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28268544/comparison-of-viscoelastic-property-characterization-of-plastisol-phantoms-with-magnetic-resonance-elastography-and-high-frequency-rheometry
#12
P M Lefebvre, K Tse Ve Koon, E Brusseau, S Nicolle, J-F Palieme, S A Lambert, D Grenier
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/28262903/an-efficient-route-to-fabricate-fatigue-free-p-vdf-trfe-capacitors-with-enhanced-piezoelectric-and-ferroelectric-properties-and-excellent-thermal-stability-for-sensing-and-memory-applications
#13
Deepa Singh, Deepak, Ashish Garg
P(VDF-TrFE), the best known ferroelectric polymer, suffers from a rather low piezoelectric response as well as poor electrical fatigue life, hampering its application potential. Herein, we report the fabrication of fatigue free poly(vinylidenedifluoride-trifluoroethylene) P(VDF-TrFE)-based capacitors with record piezoelectric coefficients and excellent thermal stability. We proposed a cost-effective and simple solution-based process to fabricate P(VDF-TrFE)-based memory capacitors with large polarization (8...
March 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28254564/a-method-to-estimate-the-absolute-ultrasonic-nonlinearity-parameter-from-relative-measurements
#14
Jongbeom Kim, Dong-Gi Song, Kyung-Young Jhang
The ultrasonic nonlinearity parameter (β) is determined from the particle displacement amplitudes of the fundamental and second-order harmonic components in an ultrasonic wave propagated through a material. This parameter is generally referred to as the absolute parameter. However, measuring the second harmonic component is especially difficult because its amplitude is usually much smaller than those of signals in typical ultrasonic measurements. For this reason, most studies use the relative parameter determined using the measured electric signal amplitudes of the fundamental and second harmonic ultrasonic waves...
February 17, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28249472/rapid-jetting-status-inspection-and-accurate-droplet-volume-measurement-for-a-piezo-drop-on-demand-inkjet-print-head-using-a-scanning-mirror-for-display-applications
#15
Dong-Youn Shin, Minsung Kim
Despite the inherent fabrication simplicity of piezo drop-on-demand inkjet printing, the non-uniform deposition of colourants or electroluminescent organic materials leads to faulty display products, and hence, the importance of rapid jetting status inspection and accurate droplet volume measurement increases from a process perspective. In this work, various jetting status inspections and droplet volume measurement methods are reviewed by discussing their advantages and disadvantages, and then, the opportunities for the developed prototype with a scanning mirror are explored...
February 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28245603/testing-of-piezo-actuated-glass-micro-membranes-by-optical-low-coherence-reflectometry
#16
Sabina Merlo, Paolo Poma, Eleonora Crisà, Dino Faralli, Marco Soldo
In this work, we have applied optical low-coherence reflectometry (OLCR), implemented with infra-red light propagating in fiberoptic paths, to perform static and dynamic analyses on piezo-actuated glass micro-membranes. The actuator was fabricated by means of thin-film piezoelectric MEMS technology and was employed for modifying the micro-membrane curvature, in view of its application in micro-optic devices, such as variable focus micro-lenses. We are here showing that OLCR incorporating a near-infrared superluminescent light emitting diode as the read-out source is suitable for measuring various parameters such as the micro-membrane optical path-length, the membrane displacement as a function of the applied voltage (yielding the piezo-actuator hysteresis) as well as the resonance curve of the fundamental vibration mode...
February 25, 2017: Sensors
https://www.readbyqxmd.com/read/28241584/low-loss-3d-laser-written-mid-infrared-linbo-sub-3-sub-depressed-index-cladding-waveguides-for-both-te-and-tm-polarizations
#17
Huu-Dat Nguyen, Airán Ródenas, Javier R Vázquez de Aldana, Guillermo Martín, Javier Martínez, Magdalena Aguiló, Maria Cinta Pujol, Francesc Díaz
We report mid-infrared LiNbO<sub>3</sub> depressed-index microstructured cladding waveguides fabricated by three-dimensional laser writing showing low propagation losses (~1.5 dB/cm) at 3.68 µm wavelength for both the transverse electric and magnetic polarized modes, a feature previously unachieved due to the strong anisotropic properties of this type of laser microstructured waveguides and which is of fundamental importance for many photonic applications. Using a heuristic modeling-testing iteration design approach which takes into account cladding induced stress-optic index changes, the fabricated cladding microstructure provides low-loss single mode operation for the mid-IR for both orthogonal polarizations...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28236581/single-simultaneous-and-sequential-applications-of-ultrasonic-frequencies-for-the-elimination-of-ibuprofen-in-water
#18
Asu Ziylan-Yavas, Nilsun H Ince
The study is about the assessment of single and multi-frequency operations for the overall degradation of a widely consumed analgesic pharmaceutical-ibuprofen (IBP). The selected frequencies were in the range of 20-1130kHz emissions coming from probes, baths and piezo-electric transducers attached to plate-type devices. Multi-frequency operations were applied either simultaneously as "duals", or sequentially at fixed time intervals; and the total reaction time in all operations was 30-min. The work also covers evaluation of the effect of zero-valent iron (ZVI) on the efficiency of the degradation process and the performance of the reaction systems...
January 26, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28226720/comparison-of-viscoelastic-property-characterization-of-plastisol-phantoms-with-magnetic-resonance-elastography-and-high-frequency-rheometry
#19
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
#20
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
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