Read by QxMD icon Read

f wave

B Silva, C Sánchez Muñoz, D Ballarini, A González-Tudela, M de Giorgi, G Gigli, K West, L Pfeiffer, E Del Valle, D Sanvitto, F P Laussy
The Hanbury Brown-Twiss effect is one of the celebrated phenomenologies of modern physics that accommodates equally well classical (interferences of waves) and quantum (correlations between indistinguishable particles) interpretations. The effect was discovered in the late thirties with a basic observation of Hanbury Brown that radio-pulses from two distinct antennas generate signals on the oscilloscope that wiggle similarly to the naked eye. When Hanbury Brown and his mathematician colleague Twiss took the obvious step to propose bringing the effect in the optical range, they met with considerable opposition as single-photon interferences were deemed impossible...
December 6, 2016: Scientific Reports
Andreas Tag, Vikrant Chauhan, Christian Huck, Bernhard Bader, Dominik Karolewski, F Maximilian Pitschi, Robert Weigel, Amelie Hagelauer
A novel approach for multiphysics modeling of bulk acoustic wave (BAW) filters is presented allowing accurate and at the same time efficient modeling of BAW filters at high power levels. The approach takes the different types of losses and their spatial distribution into account in order to provide the required input for thermal simulation. The temperature distribution determined by thermal simulation is used to modify the geometry and the layer stack of each single resonator of the filter. In this way, the required input for modeling of electromagnetic (EM) and acoustic behavior at high power level is generated...
December 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Muhammad Kashif, Stephan Jonas, Thomas Deserno
OBJECTIVE: For long-term electrocardiography (ECG) recordings, accurate R-wave detection is essential. Several algorithms have been proposed but not yet compared on large, noisy, or pathological data, since manual ground truth establishment is impossible on such large data. METHODS: We apply the simultaneous truth and performance level estimation (STAPLE) method to ECG signals comparing 9 R-wave detectors: Pan & Tompkins (1985), Chernenko (2007), Arzeno et al. (2008), Manikandan et al...
December 1, 2016: IEEE Transactions on Bio-medical Engineering
Teemu J Niiranen, Bindu Kalesan, Naomi M Hamburg, Emelia J Benjamin, Gary F Mitchell, Ramachandran S Vasan
BACKGROUND: The presence and implications of abnormal arterial stiffness, a potential independent predictor of outcomes, in community-dwelling treated hypertensives is unknown. Furthermore, limited data exist regarding the risk of cardiovascular disease (CVD) associated with arterial stiffness across the entire range of blood pressure. METHODS AND RESULTS: We measured carotid-femoral pulse wave velocity (PWV) and classical CVD risk factors in 2127 community-dwelling participants (mean age 60 years, 57% women) of The Framingham Offspring Cohort...
October 26, 2016: Journal of the American Heart Association
P R Bauer, K Gorgels, W Spetgens, N E C van Klink, F S S Leijten, J W Sander, G H Visser, M Zijlmans
OBJECTIVE: Up to 30% of people with juvenile myoclonic epilepsy (JME) have photoparoxysmal responses (PPR). Recent studies report on structural and pathophysiological differences between people with JME with (JME+PPR) and without PPR (JME-PPR). We investigated whether electrophysiological features outside photic stimulation differ between these subtypes. METHODS: We analysed EEG recordings of people with JME at a tertiary epilepsy centre and an academic hospital...
November 14, 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
D E Aguiam, A Silva, V Bobkov, P J Carvalho, P F Carvalho, R Cavazzana, G D Conway, O D'Arcangelo, L Fattorini, H Faugel, A Fernandes, H Fünfgelder, B Gonçalves, L Guimarais, G De Masi, L Meneses, J M Noterdaeme, R C Pereira, G Rocchi, J M Santos, A A Tuccillo, O Tudisco
A new multichannel frequency modulated continuous-wave reflectometry diagnostic has been successfully installed and commissioned on ASDEX Upgrade to measure the plasma edge electron density profile evolution in front of the Ion Cyclotron Range of Frequencies (ICRF) antenna. The design of the new three-strap ICRF antenna integrates ten pairs (sending and receiving) of microwave reflectometry antennas. The multichannel reflectometer can use three of these to measure the edge electron density profiles up to 2 × 10(19) m(-3), at different poloidal locations, allowing the direct study of the local plasma layers in front of the ICRF antenna...
November 2016: Review of Scientific Instruments
Orso Meneghini, Francesco A Volpe
An innovative millimeter wave diagnostic is proposed to measure the local magnetic field and edge current as a function of the minor radius in the tokamak pedestal region. The idea is to identify the direction of minimum reflectivity at the O-mode cutoff layer. Correspondingly, the transmissivity due to O-X mode conversion is maximum. That direction, and the angular map of reflectivity around it, contains information on the magnetic field vector B at the cutoff layer. Probing the plasma with different wave frequencies provides the radial profile of B...
November 2016: Review of Scientific Instruments
A Muraro, L Giacomelli, M Nocente, M Rebai, D Rigamonti, F Belli, P Calvani, J Figueiredo, M Girolami, G Gorini, G Grosso, A Murari, S Popovichev, D M Trucchi, M Tardocchi
A prototype Single crystal Diamond Detector (SDD) was installed at the Joint European Torus (JET) in 2013 along an oblique line of sight and demonstrated the possibility to carry out neutron spectroscopy measurements with good energy resolution and detector stability in discharges heated by neutral beam injection and radio-frequency waves. Starting from these positive results, within the Vertical Neutron Spectrometer project of the Joint European Torus, we have developed a pixelated instrument consisting of a matrix of 12 independent SDDs, called the Diamond Vertical Neutron Spectrometer (DVNS), which boosts the detection efficiency of a single SDD by an order of magnitude...
November 2016: Review of Scientific Instruments
G Ciani, M A Arain, S M Aston, D Feldbaum, P Fulda, J Gleason, M Heintze, R M Martin, C L Mueller, D M Nanda Kumar, A Pele, D H Reitze, P Sainathan, D B Tanner, L F Williams, G Mueller
We report on the design and performance of small optic suspensions developed to suppress seismic motion of out-of-cavity optics in the input optics subsystem of the Advanced Laser Interferometer Gravitational Wave Observatory. These compact single stage suspensions provide isolation in all six degrees of freedom of the optic, local sensing and actuation in three of them, and passive damping for the other three.
November 2016: Review of Scientific Instruments
F da Silva, S Heuraux, E Ricardo, P Quental, J Ferreira
We conducted a first assessment of the measurement performance of the in-vessel components at gap 6 of the ITER plasma position reflectometry with the aid of a synthetic Ordinary Mode (O-mode) broadband frequency-modulated continuous-wave reflectometer implemented with REFMUL, a 2D finite-difference time-domain full-wave Maxwell code. These simulations take into account the system location within the vacuum vessel as well as its access to the plasma. The plasma case considered is a baseline scenario from Fusion for Energy...
November 2016: Review of Scientific Instruments
R K Follett, J A Delettrez, D H Edgell, R J Henchen, J Katz, J F Myatt, D H Froula
Collective Thomson scattering is a technique for measuring the plasma conditions in laser-plasma experiments. Simultaneous measurements of ion-acoustic and electron plasma-wave spectra were obtained using a 263.25-nm Thomson-scattering probe beam. A fully reflective collection system was used to record light scattered from electron plasma waves at electron densities greater than 10(21) cm(-3), which produced scattering peaks near 200 nm. An accurate analysis of the experimental Thomson-scattering spectra required accounting for plasma gradients, instrument sensitivity, optical effects, and background radiation...
November 2016: Review of Scientific Instruments
G G van Eden, M L Reinke, B J Peterson, T K Gray, L F Delgado-Aparicio, M A Jaworski, J Lore, K Mukai, R Sano, S N Pandya, T W Morgan
The InfraRed Video Bolometer (IRVB) is a powerful tool to measure radiated power in magnetically confined plasmas due to its ability to obtain 2D images of plasma emission using a technique that is compatible with the fusion nuclear environment. A prototype IRVB has been developed and installed on NSTX-U to view the lower divertor. The IRVB is a pinhole camera which images radiation from the plasma onto a 2.5 μm thick, 9 × 7 cm(2) Pt foil and monitors the resulting spatio-temporal temperature evolution using an IR camera...
November 2016: Review of Scientific Instruments
H Qu, T Zhang, X Han, H M Xiang, F Wen, K N Geng, Y M Wang, D F Kong, J Q Cai, C B Huang, Y Gao, X Gao, S Zhang
A new multi-channel poloidal correlation reflectometry is developed at Experimental Advanced Superconducting Tokamak. Eight dielectric resonator oscillators with frequencies of 12.5 GHz, 13.5 GHz, 14.5 GHz, 15 GHz, 15.5 GHz, 16 GHz, 17 GHz, and 18 GHz are used as sources. Signals from the sources are up-converted to V band using active quadruplers and then coupled together. The output waves are launched by one single antenna after passing through a 20 dB directional coupler which can provide the reference signal...
November 2016: Review of Scientific Instruments
Y L Zhu, J L Xie, C X Yu, Z L Zhao, B X Gao, D X Chen, W D Liu, W Liao, C M Qu, C Luo, X Hu, A G Spear, N C Luhmann, C W Domier, M Chen, X Ren, B J Tobias
Millimeter-wave imaging diagnostics, with large poloidal span and wide radial range, have been developed on the EAST tokamak for visualization of 2D electron temperature and density fluctuations. A 384 channel (24 poloidal × 16 radial) Electron Cyclotron Emission Imaging (ECEI) system in F-band (90-140 GHz) was installed on the EAST tokamak in 2012 to provide 2D electron temperature fluctuation images with high spatial and temporal resolution. A co-located Microwave Imaging Reflectometry (MIR) will be installed for imaging of density fluctuations by December 2016...
November 2016: Review of Scientific Instruments
Martín F Ortiz-Genga, Sofía Cuenca, Matteo Dal Ferro, Esther Zorio, Ricardo Salgado-Aranda, Vicente Climent, Laura Padrón-Barthe, Iria Duro-Aguado, Juan Jiménez-Jáimez, Víctor M Hidalgo-Olivares, Enrique García-Campo, Chiara Lanzillo, M Paz Suárez-Mier, Hagith Yonath, Sonia Marcos-Alonso, Juan P Ochoa, José L Santomé, Diego García-Giustiniani, Jorge L Rodríguez-Garrido, Fernando Domínguez, Marco Merlo, Julián Palomino, María L Peña, Juan P Trujillo, Alicia Martín-Vila, Davide Stolfo, Pilar Molina, Enrique Lara-Pezzi, Francisco E Calvo-Iglesias, Eyal Nof, Leonardo Calò, Roberto Barriales-Villa, Juan R Gimeno-Blanes, Michael Arad, Pablo García-Pavía, Lorenzo Monserrat
BACKGROUND: Filamin C (encoded by the FLNC gene) is essential for sarcomere attachment to the plasmatic membrane. FLNC mutations have been associated with myofibrillar myopathies, and cardiac involvement has been reported in some carriers. Accordingly, since 2012, the authors have included FLNC in the genetic screening of patients with inherited cardiomyopathies and sudden death. OBJECTIVES: The aim of this study was to demonstrate the association between truncating mutations in FLNC and the development of high-risk dilated and arrhythmogenic cardiomyopathies...
December 6, 2016: Journal of the American College of Cardiology
Valery A Grigorev, Boris G Katsnelson, James F Lynch
Analyses of fluctuations of low frequency signals (300 ± 30 Hz) propagating in shallow water in the presence of nonlinear internal waves (NIWs) in the Shallow Water 2006 experiment are carried out. Signals were received by a vertical line array at a distance of ∼20 km from the source. A NIW train was moving totally inside of the acoustic track, and the angle between the wave front of the NIW and the acoustic track in the horizontal plane was ∼10°. It is shown that the spectrum of the sound intensity fluctuations contains peaks corresponding to the coupling of pairs of propagating modes...
November 2016: Journal of the Acoustical Society of America
Andrew W White, Frank S Henyey, Rex K Andrew, James A Mercer, Peter F Worcester, Matthew A Dzieciuch, John A Colosi
A mechanism is presented by which the observed acoustic intensity is made to vary due to changes in the acoustic path that are caused by internal-tide vertical fluid displacements. The position in range and depth of large-scale caustic structure is determined by the background sound-speed profile. Internal tides cause a deformation of the background profile, changing the positions of the caustic structures-which can introduce intensity changes at a distant receiver. Gradual fades in the acoustic intensity occurring over timescales similar to those of the tides were measured during a low-frequency (284-Hz) acoustic scattering experiment in the Philippine Sea in 2009 [White et al...
November 2016: Journal of the Acoustical Society of America
Alexis Bottero, Paul Cristini, Dimitri Komatitsch, Mark Asch
The numerical simulation of acoustic waves in complex three-dimensional (3D) media is a key topic in many branches of science, from exploration geophysics to non-destructive testing and medical imaging. With the drastic increase in computing capabilities this field has dramatically grown in the last 20 years. However many 3D computations, especially at high frequency and/or long range, are still far beyond current reach and force researchers to resort to approximations, for example, by working in two dimensions (plane strain) or by using a paraxial approximation...
November 2016: Journal of the Acoustical Society of America
C G E Alfieri, A Diebold, F Emaury, E Gini, C J Saraceno, U Keller
We present semiconductor saturable absorber mirrors (SESAMs) that can potentially support femtosecond pulses from ultrafast thin disk lasers (TDLs) with high average power approaching the kW-power level and high pulse energy in the range of 100 µJ to 1 mJ at megahertz pulse repetition rates. For high-power operation, the SESAM parameters will ultimately limit the shortest pulse duration from a soliton mode-locked laser before mode locking instabilities such as multiple pulsing instabilities and continuous wave (cw) breakthrough start to occur...
November 28, 2016: Optics Express
Alberto Sottile, Eugenio Damiano, Mauro Tonelli
We report on, to the best of our knowledge, the first growth, spectroscopy, and laser operation of monocrystalline Ba(Y<sub>0.8</sub>Lu<sub>0.2</sub>)<sub>2</sub>F<sub>8</sub> doped with 1.25 at.% of Pr<sup>3+</sup> ions (Pr:BYLF). We studied the spectroscopic properties of this material, particularly in comparison with its isomorph Pr<sup>3+</sup>: BaY<sub>2</sub>F<sub>8</sub> (Pr:BYF). Under diode-pumped excitation, we achieved continuous-wave laser operation in the orange, red, and deep red regions in the three possible crystal orientations...
December 1, 2016: Optics Letters
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"