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T wave axis

Xiaowei Zhang, Zhifeng Tang, Fuzai Lv, Xiaohong Pan
A wavefront analysis indicates that a flexural wave propagates at a helix angle with respect to the pipe axis. The expression for calculation of the helix angle for each flexural mode is given, and the helix angle dispersion curves for flexural modes are calculated. According to the new understanding of flexural guided waves, a helical comb magnetostrictive patch transducer (HCMPT) is proposed for selectively exciting a single predominant flexural torsional guided wave in a pipe and inspecting spiral welded pipes using flexural waves...
September 29, 2016: Ultrasonics
F Birettoni, D Caivano, V Patata, N S Moïse, C Guglielmini, M Rishniw, F Porciello
OBJECTIVES: The size of the pulmonary veins (PVs) and pulmonary arteries (PAs) changes in response to hemodynamic alterations caused by physiological events and disease. We sought to create standardized echocardiographic methods for imaging the right ostium of the pulmonary veins (RPVs) and the right pulmonary artery (RPA) using specific landmarks and timing to quantify vessel diameters and phasic changes during the cardiac cycle. ANIMALS: Fifty client-owned healthy dogs prospectively recruited...
September 23, 2016: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
Soumya Sarang, Robert J Williams, Oliver Lux, Ondrej Kitzler, Aaron McKay, Hadiya Jasbeer, Richard P Mildren
We report a quasi-continuous-wave external cavity Raman laser based on potassium yttrium tungstate (KYW). Laser output efficiency and spectrum are severely affected by the presence of high gain Raman modes of low frequency (< 250 cm<sup>-1</sup>) that are characteristic of this crystal class. Output spectra contained frequency combs spaced by the low frequency modes but with the overall pump-to-Stokes conversion efficiency at least an order of magnitude lower than that typically obtained in other crystal Raman lasers...
September 19, 2016: Optics Express
Y Zhang, J J Lee, R G Moore, W Li, M Yi, M Hashimoto, D H Lu, T P Devereaux, D-H Lee, Z-X Shen
Superconductivity originates from pairing of electrons near the Fermi energy. The Fermi surface topology and pairing symmetry are thus two pivotal characteristics of a superconductor. Superconductivity in one monolayer (1 ML) FeSe thin film has attracted great interest recently due to its intriguing interfacial properties and possibly high superconducting transition temperature over 65 K. Here, we report high-resolution measurements of the Fermi surface and superconducting gaps in 1 ML FeSe using angle-resolved photoemission spectroscopy...
September 9, 2016: Physical Review Letters
Chase T Ellis, Joseph G Tischler, Orest J Glembocki, Francisco J Bezares, Alexander J Giles, Richard Kasica, Loretta Shirey, Jeffrey C Owrutsky, Dmitry N Chigrin, Joshua D Caldwell
Polar dielectrics have garnered much attention as an alternative to plasmonic metals in the mid- to long-wave infrared spectral regime due to their low optical losses. As such, nanoscale resonators composed of these materials demonstrate figures of merit beyond those achievable in plasmonic equivalents. However, until now, only low-order, phonon-mediated, localized polariton resonances, known as surface phonon polaritons (SPhPs), have been observed in polar dielectric optical resonators. In the present work, we investigate the excitation of 16 distinct high-order, multipolar, localized surface phonon polariton resonances that are optically excited in rectangular pillars etched into a semi-insulating silicon carbide substrate...
2016: Scientific Reports
J C L Rodrigues, T Erdei, A G Dastidar, B McIntyre, A E Burchell, L E K Ratcliffe, E C Hart, M C K Hamilton, J F R Paton, A K Nightingale, N E Manghat
Left atrial enlargement (LAE) has adverse prognostic implications in hypertension. We sought to determine the accuracy of five electrocardiogram (ECG) criteria for LAE in hypertension relative to cardiac magnetic resonance (CMR) gold standard and investigate the effect of concomitant obesity. One hundred and thirty consecutive patients (age: 51.4±15.1 years, 47% male, 51% obese, systolic blood pressure (BP): 171±29 mm Hg, diastolic BP: 97±15 mm Hg) referred for CMR (1.5 T) from a tertiary hypertension clinic were included...
September 8, 2016: Journal of Human Hypertension
T Ekino, A M Gabovich, Mai Suan Li, H Szymczak, A I Voitenko
The quasiparticle tunnel current J(V) between the superconducting ab-planes along the c-axis and the corresponding conductance [Formula: see text] were calculated for symmetric junctions composed of disordered d-wave layered superconductors partially gapped by charge density waves (CDWs). Here, V is the voltage. Both the checkerboard and unidirectional CDWs were considered. It was shown that the spatial spread of the CDW-pairing strength substantially smears the peculiarities of G(V) appropriate to uniform superconductors...
November 9, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Paul S Pagel, Brent T Boettcher, Derek J De Vry, Julie K Freed, Zafar Iqbal
OBJECTIVE: Transmitral blood flow produces a vortex ring (quantified using vortex formation time [VFT]) that enhances the efficiency of left ventricular (LV) filling. VFT is attenuated in LV hypertrophy resulting from aortic valve stenosis (AS) versus normal LV geometry. Many patients with AS also have aortic insufficiency (AI). The authors tested the hypothesis that moderate AI falsely elevates VFT by partially inhibiting mitral leaflet opening in patients with AS. DESIGN: Observational study...
October 2016: Journal of Cardiothoracic and Vascular Anesthesia
Sivaraman Jayaraman, Venkatesan Sangareddi, R Periyasamy, Justin Joseph, Ravi Marimuthu Shanmugam
OBJECTIVE: Modified Limb Lead (MLL) ECG system may be used during rest or exercise ECG, or atrial activity enhancement. Because of modification in the limb electrode placement, changes are likely to happen in ECG wave amplitudes and frontal plane axis, which may alter the clinical limits of normality and ECG diagnostic criteria. The present study investigated the effects of the modified limb electrode position on the electrocardiographic waveforms, ST segment amplitudes (STa) and frontal plane axis...
June 29, 2016: Anatolian Journal of Cardiology
A N Khoroshun, A V Chernykh, A N Tsimbaluk, J A Kirichenko, P V Yezhov, A V Kuzmenko, J T Kim
The behavior of an axial optical vortex (OV), which is generated with the use of a Gaussian beam and two ramps implemented by a phase-only spatial light modulator (SLM), is studied as a function of the parameters of two ramps. The analytic solution of a wave equation is obtained in the Fresnel approximation for the diffraction of a Gaussian beam on the two-ramp structure. Nonlinear dependences of the ellipticity gamma of the intensity distribution in the OV core, as well as the angle (phi between the x-axis and the major ellipse axis of the vortex core, on the ramp phase gradient K, are analyzed...
February 2016: Journal of Nanoscience and Nanotechnology
Alan Sugrue, Peter A Noseworthy, Vaclav Kremen, J Martijn Bos, Bo Qiang, Ram K Rohatgi, Yehu Sapir, Zachi I Attia, Peter Brady, Samuel J Asirvatham, Paul A Friedman, Michael J Ackerman
BACKGROUND: Congenital long QT syndrome (LQTS) is characterized by QT prolongation. However, the QT interval itself is insufficient for diagnosis, unless the corrected QT interval is repeatedly ≥500 ms without an acquired explanation. Further, the majority of LQTS patients have a corrected QT interval below this threshold, and a significant minority has normal resting corrected QT interval values. Here, we aimed to develop and validate a novel, quantitative T wave morphological analysis program to differentiate LQTS patients from healthy controls...
July 2016: Circulation. Arrhythmia and Electrophysiology
Alessandra Scatteia, Estefania De Garate, Chiara Bucciarelli-Ducci
CLINICAL INTRODUCTION: A 59-year-old female underwent an electrocardiogram (ECG) and echocardiographic screening. Her brother died at quite a young age of kidney failure. Resting ECG showed borderline voltage criteria for left ventricular hypertrophy (LVH), with marked widespread T-wave inversion. Echocardiogram was normal, but in consideration of exertional breathlessness and abnormal baseline ECG, she underwent a coronary angiogram, which showed unobstructed coronaries. She was then referred to have a cardiac MR (CMR) for further characterisation...
October 15, 2016: Heart: Official Journal of the British Cardiac Society
Andreas Lamprecht, Stefan Lakämper, Thierry Baasch, Iwan A T Schaap, Jurg Dual
Acoustic particle manipulation in microfluidic channels is becoming a powerful tool in microfluidics to control micrometer sized objects in medical, chemical and biological applications. By creating a standing acoustic wave in the channel, the resulting pressure field can be employed to trap or sort particles. To design efficient and reproducible devices, it is important to characterize the pressure field throughout the volume of the microfluidic device. Here, we used an optically trapped particle as probe to measure the forces in all three dimensions...
July 5, 2016: Lab on a Chip
Alan T Wall, Kent L Gee, Tracianne B Neilsen, Richard L McKinley, Michael M James
The identification of acoustic sources is critical to targeted noise reduction efforts for jets on high-performance tactical aircraft. This paper describes the imaging of acoustic sources from a tactical jet using near-field acoustical holography techniques. The measurement consists of a series of scans over the hologram with a dense microphone array. Partial field decomposition methods are performed to generate coherent holograms. Numerical extrapolation of data beyond the measurement aperture mitigates artifacts near the aperture edges...
April 2016: Journal of the Acoustical Society of America
Subhashree Sarangi, A P K Mahapatra, S Mohapatra, A K Kundu
AIM: To study and compare the age-specific changes in electrocardiographic (ECG) parameters in bipolar limb leads of conscious female native cats of Odisha. MATERIALS AND METHODS: 20 healthy female native cats aged between 4 and 36 months of age were selected for the study. These queens were divided into two groups of 10 animals each. Group 1 constituted the queens aged 4-10 months (before puberty) with a mean weight of 2.28 kg (±0.4 standard error [SE]), and those aged 11-36 months (after puberty) with a mean weight of 3...
February 2016: Veterinary World
Joydip Mukherjee, Pradip Kumar Das, Prabal Ranjan Ghosh, Dipak Banerjee, Tripti Sharma, Debananda Basak, Sagar Sanyal
AIM: The present study has been conducted to evaluate the variation in electrocardiogram (ECG) parameters among different trained breeds of dogs (viz. Labrador, German Shepherd, and Golden Retriever) used for security reasons. MATERIALS AND METHODS: The ECG was recorded by single channel ECG at a paper speed of 25 mm/s and calibration of 10 mm=1 mV. The recordings were taken from all the standard bipolar limb leads (Lead-I, II, and III) and unipolar augmented limb leads (Lead-aVR, aVL, and aVF)...
November 2015: Veterinary World
Cigdem Ozsoy-Keskinbora, Chris B Boothroyd, Rafal E Dunin-Borkowski, Peter A van Aken, Christoph T Koch
Electron holography is a powerful technique for characterizing electrostatic potentials, charge distributions, electric and magnetic fields, strain distributions and semiconductor dopant distributions with sub-nm spatial resolution. Mapping internal electrostatic and magnetic fields within nanoparticles and other low-dimensional materials by TEM requires both high spatial resolution and high phase sensitivity. Carrying out such an analysis fully quantitatively is even more challenging, since artefacts such as dynamical electron scattering may strongly affect the measurement...
June 2016: Ultramicroscopy
Shi-Bin Zhang, Ke-Nan Guo, Fei Xie, Yu Liu, Hai-Tao Shang, Hong Wei
This study determined the normal ECG patterns and values for Bama miniature pigs. Standard limb-lead ECG were recorded from 120 clinically healthy, unanesthetized piglets (age, 2 to 4 mo). The values for the ECG parameters (mean ± 1 SD) were: heart rate, 125.56 ± 18.80 bpm; P amplitude, 0.11 ± 0.03 mV; QRS amplitude, 0.63 ± 0.31 mV; P duration, 43.99 ± 5.98 ms; QRS complex, 55.27 ± 7.02 ms; RR interval, 487.55 ± 77.32 ms; PR interval, 90.72 ± 11.94 ms; QT interval, 244.72 ± 25.27 ms; and mean electrical axis, 22...
March 2016: Journal of the American Association for Laboratory Animal Science: JAALAS
Keiko Sonoda, Seiko Ohno, Sou Otuki, Koichi Kato, Nobue Yagihara, Hiroshi Watanabe, Takeru Makiyama, Tohru Minamino, Minoru Horie
AIMS: Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a disease mainly caused by desmosome gene mutations. The genetic culprit, however, remains elusive in ∼50% of ARVC patients. One of the reasons for missing genetic abnormalities is the difficulty in detecting large deletions/duplications, which are called as copy number variation (CNV) by the Sanger sequencing method. This study aimed to identify CNVs in PKP2 and a part of other desmosome genes in ARVC patients. METHODS AND RESULTS: The study cohort consisted of 71 ARVC probands who were diagnosed as definite or borderline cases based on 2010 Task Force Criteria...
March 22, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
P-L Ardelt, K Gawarecki, K Müller, A M Waeber, A Bechtold, K Oberhofer, J M Daniels, F Klotz, M Bichler, T Kuhn, H J Krenner, P Machnikowski, J J Finley
We report Coulomb mediated hybridization of excitonic states in optically active InGaAs quantum dot molecules. By probing the optical response of an individual quantum dot molecule as a function of the static electric field applied along the molecular axis, we observe unexpected avoided level crossings that do not arise from the dominant single-particle tunnel coupling. We identify a new few-particle coupling mechanism stemming from Coulomb interactions between different neutral exciton states. Such Coulomb resonances hybridize the exciton wave function over four different electron and hole single-particle orbitals...
February 19, 2016: Physical Review Letters
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