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https://www.readbyqxmd.com/read/28548857/experimental-demonstration-of-complete-180-o-reversal-of-magnetization-in-isolated-co-nanomagnets-on-a-pmn-pt-substrate-with-voltage-generated-strain
#1
Ayan Kumar Biswas, Hasnain Ahmad, Jayasimha Atulasimha, Supriyo Bandyopadhyay
Rotating the magnetization of a shape anisotropic magnetostrictive nanomagnet with voltage-generated stress/strain dissipates much less energy than most other magnetization rotation schemes, but its application to writing bits in non-volatile magnetic memory has been hindered by the fundamental inability of stress/strain to rotate magnetization by full 180(o). Normally, stress/strain can rotate the magnetization of a shape anisotropic elliptical nanomagnet by only up to 90(o), resulting in incomplete magnetization reversal...
May 26, 2017: Nano Letters
https://www.readbyqxmd.com/read/28538071/bone-scrapers-versus-piezoelectric-surgery-in-the-lateral-antrostomy-for-sinus-floor-elevation
#2
Claudio Stacchi, Teresa Lombardi, Paolo Cusimano, Federico Berton, Floriana Lauritano, Gabriele Cervino, Roberto Di Lenarda, Marco Cicciù
The purpose of this investigation is to evaluate 2 different methods for reducing cortical wall thickness in sinus floor augmentation surgery. A manual bone scraper was compared in terms of efficacy, speed, and safety to an ultrasonic insert for osteoplasty, in a randomized controlled clinical trial with a split-mouth design. Twenty-five patients with severe posterior maxillary atrophy were treated with bilateral sinus floor elevation with lateral approach. Antrostomies were randomly performed by eroding the cortical wall with a manual bone scraper (test site) or with an ultrasonic insert (control site) until the membrane was visible under a thin layer of bone, before outlining the window with a piezoelectric device...
May 19, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28534475/strain-engineering-of-monoclinic-domains-in-k-x-na1-x-nbo3-epitaxial-layers-a-pathway-to-enhanced-piezoelectric-properties
#3
Martin Schmidbauer, Dorothee Braun, Toni Markurt, Michael Hanke, Jutta Schwarzkopf
A novel concept to obtain a ferroelectric material with enhanced piezoelectric properties is proposed. This approach is based on the combination of two pathways: (i) the evolution of a ferroelectric monoclinic phase and, (ii) the coexistence of different types of ferroelectric domains leading to polarization discontinuities at the domain walls. Each of these pathways enables polarization rotation in the material which is responsible for giant piezoelectricity. Targeted incorporation of anisotropic epitaxial lattice strain is used to implement this approach...
May 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28531144/impact-damage-localisation-with-piezoelectric-sensors-under-operational-and-environmental-conditions
#4
Mohammad Saleh Salmanpour, Zahra Sharif Khodaei, M H Ferri Aliabadi
Guided-wave structural health monitoring (SHM) systems with piezoelectric sensors are investigated for localisation of barely visible impact damage in CFRP plates under vibration and different thermal conditions. A single baseline set is used in a delay-and-sum algorithm with temperature correction for damage localisation in a large temperature range. Damage localisation is also demonstrated under transient thermal conditions, with signals recorded while the temperature is rapidly decreased. Damage severity due to successive impact events is studied under constant temperature...
May 22, 2017: Sensors
https://www.readbyqxmd.com/read/28525798/gasoline-sensor-based-on-piezoelectric-lateral-electric-field-excited-resonator
#5
B D Zaitsev, A A Teplykh, I A Borodina, I E Kuznetsova, E Verona
It has been shown that by using piezoelectric lateral electric field excited resonators based on X - cut LiNbO3, one can determine the octane number of gasoline. The measured dependence of gasoline permittivity on its octane number has shown that there is an ambiguous connection between pointed parameters. We have demonstrated both theoretically and experimentally that the value of the real part of the electrical impedance on the frequency of parallel resonance uniquely associates with the octane number of gasoline contacting the free side of the resonator...
May 4, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28523285/electrically-pumped-wavelength-tunable-gaas-quantum-dots-interfaced-with-rubidium-atoms
#6
Huiying Huang, Rinaldo Trotta, Yongheng Huo, Thomas Lettner, Johannes S Wildmann, Javier Martín-Sánchez, Daniel Huber, Marcus Reindl, Jiaxiang Zhang, Eugenio Zallo, Oliver G Schmidt, Armando Rastelli
We demonstrate the first wavelength-tunable electrically pumped source of nonclassical light that can emit photons with wavelength in resonance with the D2 transitions of (87)Rb atoms. The device is fabricated by integrating a novel GaAs single-quantum-dot light-emitting diode (LED) onto a piezoelectric actuator. By feeding the emitted photons into a 75 mm long cell containing warm (87)Rb vapor, we observe slow-light with a temporal delay of up to 3.4 ns. In view of the possibility of using (87)Rb atomic vapors as quantum memories, this work makes an important step toward the realization of hybrid-quantum systems for future quantum networks...
March 15, 2017: ACS Photonics
https://www.readbyqxmd.com/read/28522879/comparison-of-different-bonding-techniques-for-efficient-strain-transfer-using-piezoelectric-actuators
#7
Dorian Ziss, Javier Martín-Sánchez, Thomas Lettner, Alma Halilovic, Giovanna Trevisi, Rinaldo Trotta, Armando Rastelli, Julian Stangl
In this paper, strain transfer efficiencies from a single crystalline piezoelectric lead magnesium niobate-lead titanate substrate to a GaAs semiconductor membrane bonded on top are investigated using state-of-the-art x-ray diffraction (XRD) techniques and finite-element-method (FEM) simulations. Two different bonding techniques are studied, namely, gold-thermo-compression and polymer-based SU8 bonding. Our results show a much higher strain-transfer for the "soft" SU8 bonding in comparison to the "hard" bonding via gold-thermo-compression...
April 2017: Journal of Applied Physics
https://www.readbyqxmd.com/read/28520823/comparison-of-tunnel-and-crestal-incision-techniques-in-reconstruction-of-localized-alveolar-defects
#8
Nur Altiparmak, Sina Uckan, Burak Bayram, Sıdıka Soydan
PURPOSE: The aim of this study was to compare the complication rates of recipient sites prepared using two incision techniques: crestal and tunnel. MATERIALS AND METHODS: In this prospective study, patients underwent augmentation procedures (68 patients; 75 sites) by the same surgeon that were performed consecutively using the crestal incision technique (27 horizontal, 10 vertical; crestal group) or the tunnel incision technique (27 horizontal, 11 vertical; tunnel group)...
May 18, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28520408/engineering-and-characterization-of-bacterial-nanocellulose-films-as-low-cost-and-flexible-sensor-material
#9
Rahul K Mangayil, Satu M Rajala, Arno J Pammo, Essi L Sarlin, Jin Luo, Ville P Santala, Matti Tapani Karp, Sampo R Tuukkanen
Some bacterial strains such as Komagataeibacter xylinus are able to produce cellulose as an extracellular matrix. In comparison to wood-based cellulose, bacterial cellulose (BC) holds interesting properties such as biodegradability, high purity, water-holding capacity and superior mechanical and structural properties. Aiming towards improvement in BC production titer and tailored alterations to the BC film, we engineered K. xylinus to overexpress partial and complete bacterial cellulose synthase operon that encodes activities for BC production...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28511082/nonlinear-lamb-waves-for-fatigue-damage-identification-in-frp-reinforced-steel-plates
#10
Yikuan Wang, Ruiqi Guan, Ye Lu
A nonlinear Lamb-wave-based method for fatigue crack detection in steel plates with and without carbon fibre reinforcement polymer (CFRP) reinforcement is presented in this study. Both numerical simulation and experimental evaluation were performed for Lamb wave propagation and its interaction with a fatigue crack on these two steel plate types. With the generation of the second harmonic, the damage-induced wave nonlinearities were identified by surface-bonded piezoelectric sensors. Numerical simulation revealed that the damage-induced wave component at the second harmonic was slightly affected by the existence of CFRP laminate, although the total wave energy was decreased because of wave leakage into the CFRP laminate...
May 6, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28511081/a-novel-ultrasonic-surface-machining-tool-utilizing-elastic-traveling-waves
#11
Ruinan Ji, Jiamei Jin, Liang Wang, Jianhui Zhang
With the rapid development of modern industrial technology and high performance technology products, ultra-precision machining technology becomes increasingly important. However, joint clearance of kinematic pairs, lack of feeding accuracy and overlarge contact stress still limit the further improvement of ultra-precision machining technology. In this study, a novel surface machining method utilizing structural elastic waves was proposed, and a machining tool using the piezoelectric actuating principle was presented for verifying the proposed method...
May 4, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28506573/nanogenerators-for-human-body-energy-harvesting
#12
REVIEW
Antonino Proto, Marek Penhaker, Silvia Conforto, Maurizio Schmid
Humans generate remarkable quantities of energy while performing daily activities, but this energy usually dissipates into the environment. Here, we address recent progress in the development of nanogenerators (NGs): devices that are able to harvest such body-produced biomechanical and thermal energies by exploiting piezoelectric, triboelectric, and thermoelectric physical effects. In designing NGs, the end-user's comfort is a primary concern. Therefore, we focus on recently developed materials giving flexibility and stretchability to NGs...
May 12, 2017: Trends in Biotechnology
https://www.readbyqxmd.com/read/28505608/a-differential-optical-interferometer-for-measuring-short-pulses-of-surface-acoustic-waves
#13
Anurupa Shaw, Damien Teyssieux, Vincent Laude
The measurement of the displacements caused by the propagation of a short pulse of surface acoustic waves on a solid substrate is investigated. A stabilized time-domain differential interferometer is proposed, with the surface acoustic wave (SAW) sample placed outside the interferometer. Experiments are conducted with surface acoustic waves excited by a chirped interdigital transducer on a piezoelectric lithium niobate substrate having an operational bandwidth covering the 200-400MHz frequency range and producing 10-ns pulses with 36nm maximum out-of-plane displacement...
May 10, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28504937/ultrasonic-fingerprint-sensor-with-transmit-beamforming-based-on-a-pmut-array-bonded-to-cmos-circuitry
#14
Xiaoyue Jiang, Hao-Yen Tang, Yipeng Lu, Eldwin Ng, Julius Tsai, Bernhard Boser, David Horsley
In this paper, we present a single-chip 65x42 element ultrasonic pulse-echo fingerprint sensor with transmit beamforming based on piezoelectric micromachined ultrasonic transducers (PMUTs) directly bonded to a CMOS readout ASIC. The readout ASIC was realized in a standard 180 nm CMOS process with a 24V high voltage transistor option. Pulse-echo measurements are performed column-by-column in sequence using either one column or five columns to transmit the ultrasonic pulse at 20 MHz. Transmit beamforming is used to focus the ultrasonic beam at the imaging plane where the finger is located, increasing the ultrasonic pressure and narrowing the 3dB beam-width to 50 microns, a factor of 6...
May 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28504751/highly-scalable-femtosecond-coherent-beam-combining-demonstrated-with-19-fibers
#15
J Le Dortz, A Heilmann, M Antier, J Bourderionnet, C Larat, I Fsaifes, L Daniault, S Bellanger, C Simon Boisson, J-C Chanteloup, E Lallier, A Brignon
Coherent beam combining in the femtosecond regime of a record number of 19 fibers is demonstrated. The interferometric phase measurement technique, particularly well suited to phase-lock a very large number of fibers, is successfully demonstrated in the femtosecond regime. A servo loop is implemented to control piezoelectric fiber stretchers for both phase and delay variation compensation. The residual phase errors are below λ/60  rms. Nearly 50% of the total energy is contained in the far-field central lobe...
May 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28502994/depoling-and-fatigue-behavior-of-pb-mg1-3nb2-3-o3-pbtio3-single-crystal-at-megahertz-frequencies-under-bipolar-electric-field
#16
Zhaojiang Chen, Shiyang Li, Yang Zhang, Wenwu Cao
Bipolar electric field induced degradation in [001]c poled Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (PMN-0.29PT) single crystals was investigated at megahertz frequencies. The electromechanical coupling factor kt , dielectric constant εr , dielectric loss D, and piezoelectric constant d33 were measured as a function of amplitude, frequency, and number of cycles of the applied electric field. Our results showed that samples degrade rapidly when the field amplitude is larger than a critical value due to the onset of domain switching...
May 7, 2017: Journal of Applied Physics
https://www.readbyqxmd.com/read/28499995/large-scale-nonlinear-lumped-and-integrated-field-simulations-of-top-orthogonal-to-bottom-electrode-cmut-architectures
#17
Christopher Ceroici, Roger J Zemp
Capacitive micromachined ultrasonic transducers (CMUTs) promise many advantages over traditional piezoelectric transducers such as the potential to construct large, cost-effective 2D arrays. To avoid wiring congestion issues associated fully wired arrays, Top-Orthogonal-to-Bottom Electrode (TOBE) CMUT array architectures have proven to be a more practical alternative, using only 2N wires for an NxN array. Optimally designing a TOBE CMUT array is a significant challenge due to the range of parameters from the device level up to the operating conditions of the entire array...
May 9, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28497695/origin-of-in-situ-domain-formation-of-heavily-nb-doped-pb-zr-ti-o3-thin-films-sputtered-on-ir-tiw-sio2-si-substrates-for-mobile-sensor-applications
#18
Chan Su Han, Kyu Sik Park, Hong Je Choi, Yong Soo Cho
High-quality piezoelectric thin films have recently been in demand for mobile sensor applications. An investigation was conducted to understand the improvements in the piezoelectric and imprint characteristics of heavily Nb-doped lead zirconate titanate thin films with an extensive range of Nb content (up to 14 mol %) beyond the typical solid solubility limit of Nb. The positive effects produced by the unusual doping of Nb were realized by utilizing an in situ sputtering process that did not require a subsequent annealing and poling procedure...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28496129/acoustoelectric-current-in-graphene-nanoribbons
#19
T Poole, G R Nash
Surface acoustic waves (SAWs) propagating on piezoelectric substrates offer a convenient, contactless approach to probing the electronic properties of low-dimensional charge carrier systems such as graphene nanoribbons (GNRs). SAWs can also be used to transport and manipulate charge for applications such as metrology and quantum information. In this work, we investigate the acoustoelectric effect in GNRs, and show that an acoustoelectric current can be generated in GNRs with physical widths as small as 200 nm at room temperature...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28494033/intraoperative-complications-during-sinus-floor-elevation-with-lateral-approach-a-systematic-review
#20
Claudio Stacchi, Francesca Andolsek, Federico Berton, Giuseppe Perinetti, Chiara Ottavia Navarra, Roberto Di Lenarda
PURPOSE: To analyze the occurrence of intraoperative complications during sinus floor elevation with a lateral approach and their correlations with the technique adopted by surgeons. MATERIALS AND METHODS: Electronic and manual searches resulted in 4,417 records on sinus floor elevation. Twenty-one randomized clinical trials (RCTs) and 11 prospective controlled clinical trials (CCTs) reporting occurrence of intraoperative complications were included. Risk of bias was assessed according to the Cochrane tool and a modified Downs and Black quality analysis for RCTs and CCTs, respectively...
May 2017: International Journal of Oral & Maxillofacial Implants
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