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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
#1
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/28533826/a-novel-triage-tool-optic-nerve-sheath-diameter-in-traumatic-brain-injury-and-its-correlation-to-rotterdam-computed-tomography-ct-scoring
#2
Sudha Kiran Das, Sachin P Shetty, Kamal Kumar Sen
BACKGROUND: Optic nerve sheath diameter (ONSD) evaluated in CT imaging as well as Rotterdam CT Score (RCTS) are proven independent predictors of outcome in patients with traumatic brain injury (TBI). To date, no study has correlated ONSD on admission CT scan with RCTS. MATERIAL/METHODS: Retrospective cohort study comprised of consecutive patients undergoing CT imaging for traumatic brain injury recruited between January and October 2015. Bilateral ONSD was measured 3 mm behind the eyeball in axial and sagittal planes and mean value was calculated...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28530247/long-range-ferrimagnetic-order-in-a-two-dimensional-supramolecular-kondo-lattice
#3
Jan Girovsky, Jan Nowakowski, Md Ehesan Ali, Milos Baljozovic, Harald R Rossmann, Thomas Nijs, Elise A Aeby, Sylwia Nowakowska, Dorota Siewert, Gitika Srivastava, Christian Wäckerlin, Jan Dreiser, Silvio Decurtins, Shi-Xia Liu, Peter M Oppeneer, Thomas A Jung, Nirmalya Ballav
Realization of long-range magnetic order in surface-supported two-dimensional systems has been challenging, mainly due to the competition between fundamental magnetic interactions as the short-range Kondo effect and spin-stabilizing magnetic exchange interactions. Spin-bearing molecules on conducting substrates represent a rich platform to investigate the interplay of these fundamental magnetic interactions. Here we demonstrate the direct observation of long-range ferrimagnetic order emerging in a two-dimensional supramolecular Kondo lattice...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28528536/efficacy-of-ultrasound-guided-transversus-abdominis-plane-block-and-rectus-sheath-block-with-ropivacaine-and-dexmedetomidine-in-elderly-high-risk-patients-undergoing-emergency-abdominal-surgery
#4
Lili Xu, Zhiyong Hu, Jianjun Shen, Patrick M McQuillan
BACKGROUND: This study was designed to evaluate the effectiveness and safety of ultrasound-guided transversus abdominis plane (TAP) and rectus sheath (RS) blocks with ropivacaine and dexmedetomidine in elderly, high-risk patients undergoing emergency abdominal surgery. METHODS: Sixty elderly patients undergoing emergency abdominal surgery receiving both bilateral ultrasound-guided TAP and RS blocks were randomly divided into two groups: R+D (10 ml of 0.25% ropivacaine+0...
May 19, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28510457/spatiotemporal-evolution-of-coherent-elastic-strain-waves-in-a-single-mos2-flake
#5
Alyssa J McKenna, Jeffrey K Eliason, David J Flannigan
We use bright-field imaging in an ultrafast electron microscope to spatiotemporally map the evolution of photoexcited coherent strain waves in a single, micrometer-size flake of MoS2. Following in situ femtosecond photoexcitation, we observe individual wave trains emerge from discrete nanoscale morphological features and propagate in-plane along specific wave vectors at approximately the speed of sound (7 nm/ps). Over the span of several hundred picoseconds, the 50 GHz wave trains (20 ps periods) are observed to undergo phonon-phonon scattering and wave-train interference, resulting in a transition to larger-scale, incoherent structural dynamics...
May 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28509710/ultrasound-guided-pericardiocentesis-a-novel-parasternal-approach
#6
Adi Osman, Tan Wan Chuan, Jamalludin Ab Rahman, Gabriele Via, Guido Tavazzi
OBJECTIVE: The aim of this study was to evaluate a novel pericardiocentesis technique using an in-plane parasternal medial-to-lateral approach with the use of a high-frequency probe in patients with cardiac tamponade. BACKGROUND: Echocardiography is pivotal in the diagnosis of pericardial effusion and tamponade physiology. Ultrasound guidance for pericardiocentesis is currently considered the standard of care. Several approaches have been described recently, which differ mainly on the site of puncture (subxiphoid, apical, or parasternal)...
May 15, 2017: European Journal of Emergency Medicine: Official Journal of the European Society for Emergency Medicine
https://www.readbyqxmd.com/read/28508057/low-energy-structural-dynamics-of-ferroelectric-domain-walls-in-hexagonal-rare-earth-manganites
#7
Xiaoyu Wu, Urko Petralanda, Lu Zheng, Yuan Ren, Rongwei Hu, Sang-Wook Cheong, Sergey Artyukhin, Keji Lai
Domain walls (DWs) in ferroic materials, across which the order parameter abruptly changes its orientation, can host emergent properties that are absent in the bulk domains. Using a broadband (10(6) to 10(10) Hz) scanning impedance microscope, we show that the electrical response of the interlocked antiphase boundaries and ferroelectric DWs in hexagonal rare-earth manganites (h-RMnO3) is dominated by the bound-charge oscillation rather than free-carrier conduction at the DWs. As a measure of the rate of energy dissipation, the effective conductivity of DWs on the (001) surfaces of h-RMnO3 at gigahertz frequencies is drastically higher than that at dc, whereas the effect is absent on surfaces with in-plane polarized domains...
May 2017: Science Advances
https://www.readbyqxmd.com/read/28507290/effects-of-the-non-parabolic-kinetic-energy-on-non-equilibrium-polariton-condensates
#8
F Pinsker, X Ruan, T J Alexander
In the study of non-equilibrium polariton condensates it is usually assumed that the dispersion relation of polaritons is parabolic in nature. We show that considering the true non-parabolic kinetic energy of polaritons leads to significant changes in the behaviour of the condensate due to the curvature of the dispersion relation and the possibility of transfer of energy to high wavenumber components in the condensate spatial profile. We present explicit solutions for plane waves and linear excitations, and identify the differences in the theoretical predictions between the parabolic and non-parabolic mean-field models, showing the possibility of symmetry breaking in the latter...
May 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28505461/spatial-temporal-imaging-of-anisotropic-photocarrier-dynamics-in-black-phosphorus
#9
Bolin Liao, Huan Zhao, Ebrahim Najafi, Xiaodong Yan, He Tian, Jesse Tice, Austin J Minnich, Han Wang, Ahmed H Zewail
As an emerging single elemental layered material with a low symmetry in-plane crystal lattice, black phosphorus (BP) has attracted significant research interest owing to its unique electronic and optoelectronic properties, including its widely tunable bandgap, polarization-dependent photoresponse and highly anisotropic in-plane charge transport. Despite extensive study of the steady-state charge transport in BP, there has not been direct characterization and visualization of the hot carriers dynamics in BP immediately after photoexcitation, which is crucial to understanding the performance of BP-based optoelectronic devices...
May 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28503631/stacking-order-dynamics-in-the-quasi-two-dimensional-dichalcogenide-1t-tas2-probed-with-mev-ultrafast-electron-diffraction
#10
L Le Guyader, T Chase, A H Reid, R K Li, D Svetin, X Shen, T Vecchione, X J Wang, D Mihailovic, H A Dürr
Transitions between different charge density wave (CDW) states in quasi-two-dimensional materials may be accompanied also by changes in the inter-layer stacking of the CDW. Using MeV ultrafast electron diffraction, the out-of-plane stacking order dynamics in the quasi-two-dimensional dichalcogenide 1T-TaS2 is investigated for the first time. From the intensity of the CDW satellites aligned around the commensurate l = 1/6 characteristic stacking order, it is found out that this phase disappears with a 0...
July 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28503630/defect-mediated-phonon-dynamics-in-tas2-and-wse2
#11
Daniel R Cremons, Dayne A Plemmons, David J Flannigan
We report correlative crystallographic and morphological studies of defect-dependent phonon dynamics in single flakes of 1T-TaS2 and 2H-WSe2 using selected-area diffraction and bright-field imaging in an ultrafast electron microscope. In both materials, we observe in-plane speed-of-sound acoustic-phonon wave trains, the dynamics of which (i.e., emergence, propagation, and interference) are strongly dependent upon discrete interfacial features (e.g., vacuum/crystal and crystal/crystal interfaces). In TaS2, we observe cross-propagating in-plane acoustic-phonon wave trains of differing frequencies that undergo coherent interference approximately 200 ps after initial emergence from distinct interfacial regions...
July 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28495379/transthoracic-echocardiography-for-diagnosing-pulmonary-embolism-a-systematic-review-and-meta-analysis
#12
J Matthew Fields, Joshua Davis, Lily Girson, Arthur Au, Jacqueline Potts, Charity J Morgan, Imelda Vetter, Lee Ann Riesenberg
OBJECTIVE: Pulmonary embolism (PE) is a common diagnosis with significant mortality if not appropriately treated. The use of transthoracic echocardiography in patients with PE is common; however, its diagnostic capabilities in this use are unclear. With the increased use of ultrasonography in medical settings, it is important to understand the strengths and limitations of echocardiography for the diagnosis of PE. METHODS: We conducted a systematic review of PubMed, CINAHL, and EMBASE through 2016 for articles assessing the diagnostic accuracy of transthoracic echocardiography for PE...
May 9, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/28492566/-speckle-tracking-echocardiography-a-practical-guide
#13
Matteo Cameli, Sergio Mondillo, Maurizio Galderisi, Giulia Elena Mandoli, Piercarlo Ballo, Stefano Nistri, Verdiana Capo, Flavio D'Ascenzi, Antonello D'Andrea, Roberta Esposito, Sabina Gallina, Roberta Montisci, Giuseppina Novo, Andrea Rossi, Donato Mele, Eustachio Agricola
Speckle tracking echocardiography (STE) has recently emerged as a quantitative technique to accurately estimate myocardial function. By the analysis of the motion of speckles in the two-dimensional ultrasonic image, this technique allows a non-Doppler angle-independent objective analysis of myocardial deformation, with the possibility to quantify thickening, shortening and rotation dynamics of cardiac function. Since this technique does not require Doppler imaging, the analysis is relatively angle-independent and is marginally affected by cardiac in-plane motion artifacts...
April 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28487019/dynamic-contrast-enhanced-mri-of-the-placenta-a-tool-for-prenatal-diagnosis-of-placenta-accreta
#14
A E Millischer, B Deloison, S Silvera, Y Ville, N Boddaert, D Balvay, N Siauve, C A Cuenod, V Ttsatsaris, L Sentilhes, L J Salomon
BACKGROUND: Ultrasound (US) is the primary imaging modality for the diagnosis of placenta accreta, but it is not sufficiently accurate. MRI morphologic criteria have recently emerged as a useful tool in this setting, but their analysis is too subjective. Recent studies suggest that gadolinium enhancement may help to distinguish between the stretched myometrium and placenta within a scar area. However, objective MRI criteria are still required for prenatal diagnosis of placenta accreta...
May 2017: Placenta
https://www.readbyqxmd.com/read/28485437/crossover-from-localized-to-itinerant-states-in-hydrocarbon-mott-insulators
#15
Quynh T N Phan, Shimpei Oikawa, Satoshi Heguri, Yuki Matsuda, Katsumi Tanigaki
Crossover from an itinerant state to an isolated electronic state in electron-doped polycyclic aromatic hydrocarbon (PAH) was studied for the two smallest zigzag-type molecules of naphthalene (NN) and anthracene (AN) by focusing on their 1 : 1 stoichiometry, A1(NN) and A1(AN), with alkali metals (A = K and Rb). The competition between on-site Coulombic repulsion energy (U) and bandwidth (W) was argued in terms of their magnetic and electrical properties upon lattice expansion, when A varies from K, with a smaller ionic radius, to Rb, with a larger ionic radius...
May 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28484865/chondriokinesis-during-microsporogenesis-in-plants
#16
REVIEW
Dorota Tchórzewska
Chondriokinesis represents a highly orchestrated process of organelle rearrangement in all dividing plant and animal cells, ensuring a proper course of karyokinesis and cytokinesis. This process plays a key role in male gametophyte formation. Chondriokinesis is a regular rearrangement of cell organelles, assuring their regular inheritance, during both mitotic and meiotic divisions in plant and animal cells. The universal occurrence of the process implies its high conservatism and its probable origin at an early stage of plant evolution...
May 8, 2017: Planta
https://www.readbyqxmd.com/read/28470273/dynamical-regimes-of-four-oscillators-with-excitatory-pulse-coupling
#17
Dmitry A Safonov, Vladimir V Klinshov, Vladimir K Vanag
The dynamical regimes of four almost identical oscillators with pulsatile excitatory coupling have been studied theoretically with two models: a kinetic model of the Belousov-Zhabotinsky reaction and a phase-reduced model. Unidirectional coupling on a ring and all-to-all coupling have been considered. The time delay τ between the moments of a spike in one oscillator and a pulse perturbation of the other(s) plays a crucial role in the emergence of the dynamical modes, which are classified as regular, complex, and OS (oscillation-suppression)-modes...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28460410/comparative-study-for-alignment-of-extramedullary-guides-versus-portable-accelerometer-based-navigation-in-total-knee-arthroplasty
#18
Kazu Matsumoto, Hiroyasu Ogawa, Masashi Fukuta, Nobuyuki Mori, Haruhiko Akiyama
The use of portable, accelerometer-based navigation (PN) devices for positioning of the components of total knee arthroplasty (TKA) is emerging as an alternative to standard extramedullary (EM) systems, which was needed to the image intensifier. The aim of our study was to compare the accuracy of component positioning in TKA using an EM and PN systems. Data from 100 consecutive primary TKAs, performed by multiple surgeons in 87 patients between October 2010 and June 2015, were analyzed. Coronal and sagittal plane alignments of the TKA components, relative to the mechanical axis of the limb, were evaluated by radiography...
May 1, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28456244/inline-screw-feeding-vacuum-arc-thruster
#19
Igal Kronhaus, Matteo Laterza, Yonatan Maor
A new type of micropropulsion device for nanosatellite applications is presented-the inline-screw-feeding vacuum-arc thruster (ISF-VAT). This thruster couples a conventional "triggerless" ignition geometry with a feeding mechanism that maintains a steady state discharge performance. The feeding mechanism implements a screw action on a central cathode rod. At a predetermined rate, a complete and uniform erosion of the cathodes tip is obtained as well as "healing" of the insulator coating. The inline feeding of the cathode forces the arc to emerge on the tip of the cathode, flush with the exit plane of the anode...
April 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28436859/in-vivo-intracardiac-vector-velocity-imaging-using-phased-array-transducers-for-pediatric-cardiology
#20
Solveig Fadnes, Morten Wigen, Siri Ann Nyrnes, Lasse Lovstakken
Two-dimensional blood speckle tracking has shown promise for measuring complex flow patterns in neonatal hearts using linear arrays and high-frame-rate plane wave imaging. For general pediatric applications, however, the need for phased array probes emerges due to the limited intercostal acoustic window available. In this work, a clinically approved real-time duplex imaging setup with phased array probes was used to investigate the potential of blood speckle tracking for 2-D vector velocity imaging of children with congenital heart disease...
April 24, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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