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https://www.readbyqxmd.com/read/28297918/energy-partition-scale-by-scale-in-magnetic-archimedes-coriolis-weak-wave-turbulence
#1
A Salhi, F S Baklouti, F Godeferd, T Lehner, C Cambon
Magnetic Archimedes Coriolis (MAC) waves are omnipresent in several geophysical and astrophysical flows such as the solar tachocline. In the present study, we use linear spectral theory (LST) and investigate the energy partition, scale by scale, in MAC weak wave turbulence for a Boussinesq fluid. At the scale k^{-1}, the maximal frequencies of magnetic (Alfvén) waves, gravity (Archimedes) waves, and inertial (Coriolis) waves are, respectively, V_{A}k,N, and f. By using the induction potential scalar, which is a Lagrangian invariant for a diffusionless Boussinesq fluid [Salhi et al...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28279015/anisotropy-in-the-thermal-hysteresis-of-resistivity-and-charge-density-wave-nature-of-single-crystal-srfeo3-%C3%AE-x-ray-absorption-and-photoemission-studies
#2
S H Hsieh, R S Solanki, Y F Wang, Y C Shao, S H Lee, C H Yao, C H Du, H T Wang, J W Chiou, Y Y Chin, H M Tsai, J-L Chen, C W Pao, C-M Cheng, W-C Chen, H J Lin, J F Lee, F C Chou, W F Pong
The local electronic and atomic structures of the high-quality single crystal of SrFeO3-δ (δ~0.19) were studied using temperature-dependent x-ray absorption and valence-band photoemission spectroscopy (VB-PES) to investigate the origin of anisotropic resistivity in the ab-plane and along the c-axis close to the region of thermal hysteresis (near temperature for susceptibility maximum, Tm~78 K). All experiments herein were conducted during warming and cooling processes. The Fe L 3,2-edge X-ray linear dichroism results show that during cooling from room temperature to below the transition temperature, the unoccupied Fe 3d e g states remain in persistently out-of-plane 3d 3z(2)-r(2) orbitals...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28269220/using-multiple-placements-of-accelerometers-to-measure-cardiovascular-pulse-transit-times
#3
Natalie Kurgan Canino, Ruisheng Wang, Charles J Robinson
To measure pulse transit times (PTT) and calculate pulse wave velocities (PWV), tri-axial and uniaxial accelerometers were placed in groups of 2 to 4 over the manubrium, xiphoid process, forehead, wrist and ankle, and/or over the carotid, femoral, and posterior auricular arteries in 11 consented supine subjects. Signals were sampled at 1 kHz and filtered. Radial vectors were calculated from the tri-axial measurements. A 3-lead ECG was simultaneously collected over the same 180 s window, as well as respiratory rate...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28262257/t-wave-axis-deviation-and-qrs-t-angle-controversial-indicators-of-incident-coronary-heart-events
#4
REVIEW
Polychronis Dilaveris, Christos-Konstantinos Antoniou, Konstantinos Gatzoulis, Dimitrios Tousoulis
Abnormal orientation of the T-wave axis and increased angle between the QRS complex (depolarization) and the T-wave (repolarization) have long been assumed to provide a global measure of repolarization abnormality, and have been used to assess ventricular repolarization. The ability of the T wave axis deviation and the QRS-T angle to predict incident coronary heart events was examined in several studies. However, conflicting results have led to significant controversy in the literature concerning their purported ability...
February 20, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28257003/magnetocardiography-measurements-with-sup-4-sup-he-vector-optically-pumped-magnetometers-at-room-temperature
#5
Sophie Morales, Marie-Constance Corsi, William Fourcault, François Bertrand, Gilles Cauffet, Cyril Gobbo, François Alcouffe, François Lenouvel, Matthieu Le Prado, François Berger, Gerald Vanzetto, Etienne Labyt
In this paper, we present a proof of concept study which demonstrates for the first time the possibility to record magnetocardiography (MCG) signals with 4He vector optically-pumped magnetometers (OPM) operated in a gradiometer mode. Resulting from a compromise between sensitivity, size and operability in a clinical environment, the developed magnetometers are based on the parametric resonance of helium in zero magnetic field. Sensors are operated at room-temperature and provide a tri-axis vector measurement of the magnetic field...
March 3, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28248357/radiation-losses-and-dark-mode-at-light-guiding-by-a-linear-chain-of-nanoparticles
#6
Yurii N Barabanenkov, Mikhail Yu Barabanenkov
A new general formula is presented for a collective extinction cross section of a dielectric or a metallic nanoparticle ensemble in terms of incident electric field work on currents excited inside particles. The formula is obtained by identical transformation of the well-known expression for the summing power of electromagnetic field energy losses caused by particle ensemble scattering and absorption. The derived formula is applied to the problem of radiation losses at electromagnetic excitation transfer along a straight chain of particles...
March 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28227450/using-multiple-placements-of-accelerometers-to-measure-cardiovascular-pulse-transit-times
#7
Natalie Kurgan Canino, Ruisheng Rick Wang, Charles J Robinson, Natalie Kurgan Canino, Ruisheng Wang, Charles J Robinson, Natalie Kurgan Canino, Charles J Robinson, Ruisheng Rick Wang
To measure pulse transit times (PTT) and calculate pulse wave velocities (PWV), tri-axial and uniaxial accelerometers were placed in groups of 2 to 4 over the manubrium, xiphoid process, forehead, wrist and ankle, and/or over the carotid, femoral, and posterior auricular arteries in 11 consented supine subjects. Signals were sampled at 1 kHz and filtered. Radial vectors were calculated from the tri-axial measurements. A 3-lead ECG was simultaneously collected over the same 180 s window, as well as respiratory rate...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224424/dynamic-characteristic-mechanism-of-atrial-septal-defect-using-real-time-three-dimensional-echocardiography-and-evaluation-of-right-ventricular-functions
#8
Gao-Wa Sharen, Jun Zhang, Chuan Qin, Qing Lv
The dynamic characteristics of the area of the atrial septal defect (ASD) were evaluated using the technique of real-time three-dimensional echocardiography (RT 3DE), the potential factors responsible for the dynamic characteristics of the area of ASD were observed, and the overall and local volume and functions of the patients with ASD were measured. RT 3DE was performed on the 27 normal controls and 28 patients with ASD. Based on the three-dimensional data workstations, the area of ASD was measured at P wave vertex, R wave vertex, T wave starting point, and T wave terminal point and in the T-P section...
February 2017: Journal of Huazhong University of Science and Technology. Medical Sciences
https://www.readbyqxmd.com/read/28219889/rapid-and-rigorous-il-17a-production-by-a-distinct-subpopulation-of-effector-memory-t-lymphocytes-constitutes-a-novel-mechanism-of-toxic-shock-syndrome-immunopathology
#9
Peter A Szabo, Ankur Goswami, Delfina M Mazzuca, Kyoungok Kim, David B O'Gorman, David A Hess, Ian D Welch, Howard A Young, Bhagirath Singh, John K McCormick, S M Mansour Haeryfar
Toxic shock syndrome (TSS) is caused by staphylococcal and streptococcal superantigens (SAgs) that provoke a swift hyperinflammatory response typified by a cytokine storm. The precipitous decline in the host's clinical status and the lack of targeted therapies for TSS emphasize the need to identify key players of the storm's initial wave. Using a humanized mouse model of TSS and human cells, we herein demonstrate that SAgs elicit in vitro and in vivo IL-17A responses within hours. SAg-triggered human IL-17A production was characterized by remarkably high mRNA stability for this cytokine...
April 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28213932/correlations-between-electrocardiogram-and-biomarkers-in-acute-pulmonary-embolism-analysis-of-zatpol-2-registry
#10
Piotr Kukla, Dariusz A Kosior, Andrzej Tomaszewski, Katarzyna Ptaszyńska-Kopczyńska, Katarzyna Widejko, Robert Długopolski, Andrzej Skrzyński, Piotr Błaszczak, Kamil Fijorek, Marcin Kurzyna
BACKGROUND: Electrocardiography (ECG) is still one of the first tests performed at admission, mostly in patients (pts) with chest pain or dyspnea. The aim of this study was to assess the correlation between electrocardiographic abnormalities and cardiac biomarkers as well as echocardiographic parameter in patients with acute pulmonary embolism. METHODS: We performed a retrospective analysis of 614 pts. (F/M 334/280; mean age of 67.9 ± 16.6 years) with confirmed acute pulmonary embolism (APE) who were enrolled to the ZATPOL-2 Registry between 2012 and 2014...
February 18, 2017: Annals of Noninvasive Electrocardiology
https://www.readbyqxmd.com/read/28183339/prevalence-and-associated-factors-of-resting-electrocardiogram-abnormalities-among-systemic-lupus-erythematosus-patients-without-cardiovascular-disease
#11
Hanan Al Rayes, Paula J Harvey, Dafna D Gladman, Jiandong Su, Arthy Sabapathy, Murray B Urowitz, Zahi Touma
BACKGROUND: Electrocardiogram (ECG) cardiovascular disease (CVD) abnormalities (ECG-CVD) are predictive of subsequent CVD events in the general population. Systemic lupus erythematosus (SLE) patients are vulnerable to CVD. We aimed to determine the prevalence of ECG-CVD in SLE patients and to examine the risk factors associated with ECG-CVD. METHODS: A 12-lead resting supine ECG was performed on consecutive adult patients attending the clinic. One cardiologist interpreted the ECGs...
February 10, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28147564/demisting-using-an-ultrasonic-standing-wave-field
#12
T M Merrell, J R Saylor
Removing drops from an air flow can be challenging, particularly, for small drops. Herein a method for demisting is presented that employs ultrasonics to force small drops to combine. Specifically, a cylindrical ultrasonic standing wave field is established in a tube, forming pressure nodes that take the form of cylinders located within the tube and having the same axis as the tube. Droplets are driven toward these pressure nodes by the acoustic radiation force, forcing smaller drops to combine to form larger drops, which eventually fall due to gravity, thereby demisting the flow...
January 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28144025/case-report-of-s1q3t3-electrocardiographic-abnormality-in-a-pregnant-asthmatic-patient-during-acute-bronchospasm
#13
Hafiza Arshad, Rana Rahel Khan, Misbahuddin Khaja
BACKGROUND Asthma is the most common chronic pulmonary disease during pregnancy. Several previous reports have documented reversible electrocardiographic changes during severe acute asthma attacks, including tachycardia, P pulmonale, right bundle branch block, right axis deviation, and ST segment and T wave abnormalities. CASE REPORT We present the case of a pregnant patient with asthma exacerbation in which acute bronchospasm caused S1Q3T3 abnormality on an electrocardiogram (ECG). The complete workup of ECG findings of S1Q3T3 was negative and correlated with bronchospasm...
February 1, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28110851/is-an-abnormal-ecg-just-the-tip-of-the-ice-berg-examining-the-utility-of-electrocardiography-in-detecting-methamphetamine-induced-cardiac-pathology
#14
Elizabeth D Paratz, Jessie Zhao, Amanda K Sherwen, Rose-Marie Scarlato, Andrew I MacIsaac
BACKGROUND: Methamphetamine use is escalating in Australia and New Zealand, with increasing emergency department attendance and mortality. Cardiac complications play a large role in methamphetamine-related mortality, and it would be informative to assess the frequency of abnormal electrocardiograms (ECGs) amongst methamphetamine users. OBJECTIVE: To determine the frequency and severity of ECG abnormalities amongst methamphetamine users compared to a control group...
December 9, 2016: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28107368/multi-channel-optical-coherence-elastography-using-relative-and-absolute-shear-wave-time-of-flight
#15
Eli Elyas, Alex Grimwood, Janine T Erler, Simon P Robinson, Thomas R Cox, Daniel Woods, Peter Clowes, Ramona De Luca, Franco Marinozzi, Jérémie Fromageau, Jeffrey C Bamber
Elastography, the imaging of elastic properties of soft tissues, is well developed for macroscopic clinical imaging of soft tissues and can provide useful information about various pathological processes which is complementary to that provided by the original modality. Scaling down of this technique should ply the field of cellular biology with valuable information with regard to elastic properties of cells and their environment. This paper evaluates the potential to develop such a tool by modifying a commercial optical coherence tomography (OCT) device to measure the speed of shear waves propagating in a three-dimensional (3D) medium...
2017: PloS One
https://www.readbyqxmd.com/read/28107074/analysis-of-the-normal-electrocardiogram-in-wild-rooks-corvus-frugilegus
#16
Hossein Hassanpour, Hossein Abbasi Dehkordi, Mehdi Khosravi, Saeid Soltani, Leila Nasiri
To describe the normal electrocardiographic (ECG) patterns and values in unanesthetized rooks ( Corvus frugilegus ), standard bipolar (I, II, and III) and augmented unipolar limb (aVR, aVL, and aVF) lead ECGs were recorded from 10 clinically healthy wild rooks. Wave forms were analyzed in all leads at 50 mm/s and at 10 mm = 1 mV to determine PR, QRS, ST, and QT durations; the net QRS complex; and P and T amplitudes. The polarity of each waveform was tabulated in all leads. The mean electrical axis (MEA) for the frontal plane was counted by using leads II and III...
December 2016: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/28102875/prevalence-of-abnormal-electrocardiograms-in-swiss-elite-athletes-detected-with-modern-screening-criteria
#17
Tilman Perrin, Lukas Daniel Trachsel, Simon Schneiter, Andrea Menafoglio, Silvia Albrecht, Tony Pirrello, Prisca Eser, Laurent Roten, Boris Gojanovic, Matthias Wilhelm
AIMS OF THE STUDY: Sudden cardiac arrest in athletes is a rare but dramatic event. The value of a routine electrocardiogram (ECG) during preparticipation screening (PPS) remains controversial, partly because of the relatively high number of false positive findings. Our study aimed to evaluate the prevalence of abnormal ECGs in consecutive Swiss elite athletes, overall and with regard to different sports classes, using modern screening criteria. METHODS: We analysed the 12-lead resting ECGs of high-level elite athletes (age ≥14 years) recorded at the Swiss Olympic Medical Centre Magglingen between 2013 and 2016 during routine PPS...
January 19, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28088152/theoretical-description-of-circular-dichroism-in-photoelectron-angular-distributions-of-randomly-oriented-chiral-molecules-after-multi-photon-photoionization
#18
R E Goetz, T A Isaev, B Nikoobakht, R Berger, C P Koch
Photoelectron circular dichroism refers to the forward/backward asymmetry in the photoelectron angular distribution with respect to the propagation axis of circularly polarized light. It has recently been demonstrated in femtosecond multi-photon photoionization experiments with randomly oriented camphor and fenchone molecules [C. Lux et al., Angew. Chem., Int. Ed. 51, 4755 (2012) and C. S. Lehmann et al., J. Chem. Phys. 139, 234307 (2013)]. A theoretical framework describing this process as (2+1) resonantly enhanced multi-photon ionization is constructed, which consists of two-photon photoselection from randomly oriented molecules and successive one-photon ionization of the photoselected molecules...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28069573/relations-between-aortic-stiffness-and-left-ventricular-mechanical-function-in-the-community
#19
Vanessa Bell, Elizabeth L McCabe, Martin G Larson, Jian Rong, Allison A Merz, Ewa Osypiuk, Birgitta T Lehman, Plamen Stantchev, Jayashri Aragam, Emelia J Benjamin, Naomi M Hamburg, Ramachandran S Vasan, Gary F Mitchell, Susan Cheng
BACKGROUND: Aortic stiffness impairs optimal ventricular-vascular coupling and left ventricular systolic function, particularly in the long axis. Left ventricular global longitudinal strain (GLS) has recently emerged as a sensitive measure of early cardiac dysfunction. In this study, we investigated the relation between aortic stiffness and GLS in a large community-based sample. METHODS AND RESULTS: In 2495 participants (age 39-90 years, 57% women) of the Framingham Offspring and Omni cohorts, free of cardiovascular disease, we performed tonometry to measure arterial hemodynamics and echocardiography to assess cardiac function...
January 9, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28048747/su-f-t-230-a-simple-method-to-assess-accuracy-of-dynamic-wave-arc-irradiation-using-an-electronic-portal-imaging-device-and-log-files
#20
H Hirashima, Y Miyabe, K Yokota, M Nakamura, N Mukumoto, T Mizowaki, M Hiraoka
PURPOSE: The Dynamic Wave Arc (DWA) technique, where the multi-leaf collimator (MLC) and gantry/ring move simultaneously in a predefined non-coplanar trajectory, has been developed on the Vero4DRT. The aim of this study is to develop a simple method for quality assurance of DWA delivery using an electronic portal imaging device (EPID) measurements and log files analysis. METHODS: The Vero4DRT has an EPID on the beam axis, the resolution of which is 0.18 mm/pixel at the isocenter plane...
June 2016: Medical Physics
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