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https://www.readbyqxmd.com/read/27911378/iridium-oxide-reduced-graphene-oxide-nanohybrid-thin-film-modified-screen-printed-electrodes-as-disposable-electrochemical-paper-microfluidic-ph-sensors
#1
Jiang Yang, Tae-Joon Kwak, Xiaodong Zhang, Robert McClain, Woo-Jin Chang, Sundaram Gunasekaran
A facile, controllable, inexpensive and green electrochemical synthesis of IrO2-graphene nanohybrid thin films is developed to fabricate an easy-to-use integrated paper microfluidic electrochemical pH sensor for resource-limited settings. Taking advantages from both pH meters and strips, the pH sensing platform is composed of hydrophobic barrier-patterned paper micropad (µPAD) using polydimethylsiloxane (PDMS), screen-printed electrode (SPE) modified with IrO2-graphene films and molded acrylonitrile butadiene styrene (ABS) plastic holder...
November 22, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910840/-na-%C3%A2-5-mno2-13-nanorods-a-new-tunnel-structure-for-electrode-materials-determined-ab-initio-and-refined-through-a-combination-of-electron-and-synchrotron-diffraction-data
#2
Enrico Mugnaioli, Mauro Gemmi, Marco Merlini, Michele Gregorkiewitz
(Nax□1 - x)5[MnO2]13 has been synthesized with x = 0.80 (4), corresponding to Na0.31[MnO2]. This well known material is usually cited as Na0.4[MnO2] and is believed to have a romanèchite-like framework. Here, its true structure is determined, ab initio, by single-crystal electron diffraction tomography (EDT) and refined both by EDT data applying dynamical scattering theory and by the Rietveld method based on synchrotron powder diffraction data (χ(2) = 0.690, Rwp = 0.051, Rp = 0.037, RF2 = 0.035). The unit cell is monoclinic C2/m, a = 22...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27910674/control-of-secondary-electrons-from-ion-beam-impact-using-a-positive-potential-electrode
#3
T P Crowley, D R Demers, P J Fimognari
Secondary electrons emitted when an ion beam impacts a detector can amplify the ion beam signal, but also introduce errors if electrons from one detector propagate to another. A potassium ion beam and a detector comprised of ten impact wires, four split-plates, and a pair of biased electrodes were used to demonstrate that a low-voltage, positive electrode can be used to maintain the beneficial amplification effect while greatly reducing the error introduced from the electrons traveling between detector elements...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910669/end-loss-analyzer-system-for-measurements-of-plasma-flux-at-the-c-2u-divertor-electrode
#4
M E Griswold, S Korepanov, M C Thompson
An end loss analyzer system consisting of electrostatic, gridded retarding-potential analyzers and pyroelectric crystal bolometers was developed to characterize the plasma loss along open field lines to the divertors of C-2U. The system measures the current and energy distribution of escaping ions as well as the total power flux to enable calculation of the energy lost per escaping electron/ion pair. Special care was taken in the construction of the analyzer elements so that they can be directly mounted to the divertor electrode...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910637/probing-the-electrical-impedance-of-thin-films-on-a-quartz-crystal-microbalance-qcm-making-use-of-frequency-shifts-and-piezoelectric-stiffening
#5
Astrid Peschel, Andreas Böttcher, Arne Langhoff, Diethelm Johannsmann
Using a temperature-responsive polymer film as an example, it was shown that a conventional quartz crystal microbalance (QCM) can probe a sample's electrical properties in addition to its thickness and softness. The film's electrical impedance was accessed by alternating between the driving voltage being applied to the front electrode and the back electrode. The opposing electrode was grounded in both cases. In the first configuration, the electrical properties of the sample do have an influence on the resonance frequency because of piezoelectric stiffening...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910595/cleaning-of-first-mirrors-in-iter-by-means-of-radio-frequency-discharges
#6
F Leipold, R Reichle, C Vorpahl, E E Mukhin, A M Dmitriev, A G Razdobarin, D S Samsonov, L Marot, L Moser, R Steiner, E Meyer
First mirrors of optical diagnostics in ITER are subject to charge exchange fluxes of Be, W, and potentially other elements. This may degrade the optical performance significantly via erosion or deposition. In order to restore reflectivity, cleaning by applying radio frequency (RF) power to the mirror itself and thus creating a discharge in front of the mirror will be used. The plasma generated in front of the mirror surface sputters off deposition, restoring its reflectivity. Although the functionality of such a mirror cleaning technique is proven in laboratory experiments, the technical implementation in ITER revealed obstacles which needs to be overcome: Since the discharge as an RF load in general is not very well matched to the power generator and transmission line, power reflections will occur leading to a thermal load of the cable...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910575/measurement-of-the-internal-magnetic-fluctuation-by-the-transport-of-runaways-on-j-text
#7
Z Y Chen, D W Huang, R H Tong, W Yan, Y N Wei, T K Ma, Z H Jiang, X Q Zhang, Z P Chen, Z J Yang, G Zhuang
The measurement of internal magnetic fluctuation is important for the study of transport in tokamak plasmas. The runaway electron transport induced by the sawtooth crash can be used to obtain the internal magnetic fluctuation. Inversed sawtooth-like activities on hard x-ray (HXR) fluxes following sawtooth activities were observed after the application of electrode biasing on J-TEXT tokamak. The runaway diffusion coefficient Dr is deduced to be about 30 m(2)/s according to the time delay of HXR flux peaks to the sawtooth crashes...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910574/the-development-of-an-improved-streak-tube-for-fusion-diagnostics
#8
J R Howorth, J S Milnes, Y Fisher, A Jadwin, R Boni, P A Jaanimagi
The fusion diagnostic community, including the National Ignition Facility, the Laboratory for Laser Energetics, Megajoule in France, and others require optical recording instruments with precise time resolution covering a dynamic range of many orders of magnitude. In 2012, LLE, Photek, and Sydor Instruments embarked on the re-design of an improved streak tube for fusion diagnostics. As a baseline we started with the Photek ST-Y streak tube which is a member of the RCA design dating back to 1957, because the tube body can accommodate a 35 mm long photocathode, and consequently more fibre coupled diagnostic channels than smaller designs...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910399/space-and-time-resolved-resistive-measurements-of-liquid-metal-wall-thickness
#9
S M H Mirhoseini, F A Volpe
In a fusion reactor internally coated with liquid metal, it will be important to diagnose the thickness of the liquid at various locations in the vessel, as a function of time, and possibly respond to counteract undesired bulging or depletion. The electrical conductance between electrodes immersed in the liquid metal can be used as a simple proxy for the local thickness. Here a matrix of electrodes is shown to provide spatially and temporally resolved measurements of liquid metal thickness in the absence of plasma...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910317/cryogenic-setup-for-trapped-ion-quantum-computing
#10
M F Brandl, M W van Mourik, L Postler, A Nolf, K Lakhmanskiy, R R Paiva, S Möller, N Daniilidis, H Häffner, V Kaushal, T Ruster, C Warschburger, H Kaufmann, U G Poschinger, F Schmidt-Kaler, P Schindler, T Monz, R Blatt
We report on the design of a cryogenic setup for trapped ion quantum computing containing a segmented surface electrode trap. The heat shield of our cryostat is designed to attenuate alternating magnetic field noise, resulting in 120 dB reduction of 50 Hz noise along the magnetic field axis. We combine this efficient magnetic shielding with high optical access required for single ion addressing as well as for efficient state detection by placing two lenses each with numerical aperture 0.23 inside the inner heat shield...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27909862/combined-characterization-of-bovine-polyhemoglobin-microcapsules-by-uv-vis-absorption-spectroscopy-and-cyclic-voltammetry
#11
Marcos Camargo Knirsch, Filippo Dell'Anno, Marco Salerno, Claudio Larosa, Bronislaw Polakiewicz, Roberto Eggenhöffner, Attilio Converti
Polyhemoglobin produced from pure bovine hemoglobin by reaction with PEG bis(N-succynimidil succinate) as a cross-linking agent was encapsulated in gelatin and dehydrated by freeze-drying. Free carboxyhemoglobin and polyhemoglobin microcapsules were characterized by UV-Vis spectroscopy in the absorption range 450-650 nm and cyclic voltammetry in the voltage range from -0.8 to 0.6 mV to evaluate the ability to break the bond with carbon monoxide and to study the carrier's affinity for oxygen, respectively...
December 1, 2016: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/27909758/release-of-fluoride-from-orthodontic-adhesives-and-penetration-into-enamel
#12
Panita Suebsureekul, Smorntree Viteporn
OBJECTIVE: The purpose of this work was to compare fluoride release from three orthodontic adhesives and fluoride penetration into the enamel surface. MATERIALS AND METHODS: A total of 156 extracted human premolar teeth were randomly assigned to three experimental groups and one control group (without bonding) with 39 teeth per group. Brackets were bonded to teeth using Fuji Ortho LC(®), Illuminate(®), or Light Bond(®). The amount of fluoride released (ppm) into artificial saliva was measured by a fluoride ion-selective electrode connected to an ion analyzer on days 1, 3, 7, and 30...
December 1, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/27909747/transcranial-direct-current-stimulation-tdcs-to-the-supplementary-motor-area-sma-influences-performance-on-motor-tasks
#13
K E Hupfeld, C J Ketcham, H D Schneider
The supplementary motor area (SMA) is believed to be highly involved in the planning and execution of both simple and complex motor tasks. This study aimed to examine the role of the SMA in planning the movements required to complete reaction time, balance, and pegboard tasks using anodal transcranial direct current stimulation (tDCS), which passes a weak electrical current between two electrodes, in order to modulate neuronal activity. Twenty healthy adults were counterbalanced to receive either tDCS (experimental condition) or no tDCS (control condition) for 3 days...
December 1, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27909536/screening-for-atrial-fibrillation-in-the-community-using-a-novel-ecg-recorder
#14
Irma Battipaglia Md, Katrina Gilbert BSc, Andrew J Hogarth Md PhD, Muzahir H Tayebjee Md
Aims: MyDiagnostick (MDK) is a novel portable ECG recorder. We conducted this study to evaluate its role in screening for atrial fibrillation (AF). Methods: The device is a cylindrical rod with metallic electrodes at both ends recording electrocardiogram (ECG) when both electrodes are held. Individuals were requested to hold the device for approximately 15 s, the device was then connected to a laptop (with proprietary software downloaded) and analysed. Anonymised ECGs were stored for further analysis. A total of 855 ECGs were recorded and analysed offline by two arrhythmia specialists assessing ECG quality, in particular the level of noise...
August 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909528/influence-of-inter-electrode-atrial-lead-distance-on-acapconfirm%C3%A2-viability
#15
Lapuerta Irigoyen J A, Valverde Andre I, Vigil Escalera P, Gonzalez Vasserot M
Introduction: The AcapConfirm™ feature available with the Zephyr pacemaker family (St. Jude Medical) is designed for monitoring patient's atrial capture threshold periodically, and automatically adjusting the atrial pulse amplitude. Previous studies showed a relative low proportion of patients at three months follow-up with recommended automatic atrial capture after the AcapConfirm™ viability test. The purpose of the present study is to evaluate the effect of inter electrode distance on the viability of the AcapConfirm™ algorithm...
August 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909523/comparison-of-the-influence-of-right-atrial-septal-pacing-and-appendage-pacing-on-an-atrial-function-and-atrial-fibrillation-in-the-clinical-situation
#16
Mariko Tanaka Md, Kanae Su Md, Maki Oi Md, Yasuyo Motohashi Md, Kousuke Takahashi Md, Euihong Ko Md, Koji Hanazawa Md, Mamoru Toyofuku Md, Masahiko Kitada Md, Yousuke Yuzuki Md, Takashi Tamura Md
INTRODUCTION: Recently right atrial septal (RAS) pacing is often selected, but the benefit brought by RAS pacing has not been clear. The aim of this study was to evaluate the differences between RAS pacing and right appendage (RAA) pacing. METHODS: 223 consecutive new patients with a right atrial (RA) electrode during the period from January 2004 to December 2012 were studied retrospectively. They were observed regularly at our pacemaker (PM) clinic, and we measured paced P - sensed QRS interval (pPQi) and left atrial dimension (LAD) during the observation period, furthermore the onset of atrial fibrillation (AF) was assessed...
June 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909510/interactive-in-vitro-training-in-physics-of-radiofrequency-ablation-for-physicians-and-medical-engineering-students
#17
REVIEW
Haber T, Kleister G, Selman B, Härtig J, Melichercik J, Ismer B
Radiofrequency (RF) ablation requires a complex set of devices as well as profound electrophysiological experience and substantial knowledge of physical science basics. To establish RF ablation in-vitro teaching-system, six workstations were equipped with computer-controlled RF ablation generators. Universal connection boxes allow ablation-essays with catheters of different make and model. Special wetlabs were developed combining a basin containing isotonic saline solution with a thermostat and a pump to simulate blood flow...
June 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909501/-two-for-the-price-of-one-a-single-lead-implantable-cardioverter-defibrillator-system-with-a-floating-atrial-dipole
#18
REVIEW
Nicole E Worden Md, Musab Alqasrawi Md, Siva M Krothapalli Md, Alexander Mazur Md
In patients known to be a high risk for sudden cardiac arrest, implantable cardioverter defibrillators (ICD) are a proven therapy to reduce risk of death. However, in patients without conventional indications for pacing, the optimal strategy for type of device, dual- versus single-chamber, remains debatable. The benefit of prophylactic pacing in this category of patients has never been documented. Although available atrial electrograms in a dual chamber system improve interpretation of stored arrhythmia events, allow monitoring of atrial fibrillation and may potentially reduce the risk of inappropriate shocks by enhancing automated arrhythmia discrimination, the use of dual-chamber ICDs has a number of disadvantages...
April 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27909453/the-effect-of-high-frequency-repetitive-transcranial-magnetic-stimulation-on-occupational-stress-among-health-care-workers-a-pilot-study
#19
Young In Kim, Sun Mi Kim, Hyungjin Kim, Doug Hyun Han
OBJECTIVE: Repetitive transcranial magnetic stimulation (rTMS) was approved by the Food and Drug Administration to alleviate symptoms of treatment-resistant depression. This study aimed to evaluate the effectiveness of rTMS treatment on alleviating occupational stress by evaluating clinical symptoms and quantitative electroencephalography (QEEG). METHODS: Twenty-four health care workers were randomized to receive 12 sessions of active or sham rTMS delivered to the left dorsolateral prefrontal cortex (DLPFC)...
November 2016: Psychiatry Investigation
https://www.readbyqxmd.com/read/27908579/transient-elastography-in-patients-with-implanted-cardiac-rhythm-devices
#20
Mireen Friedrich-Rust, Fabian Schoelzel, Sven Linzbach, Joerg Bojunga, Stefan Zeuzem, Florian Seeger
BACKGROUND: At present the use of transient elastography (TE) in patients with pacemaker (PM) or implantable cardioverter defibrillator (ICD) devices is not recommended, since the safety due to the electromagnet embarked in the vibrator for producing the shearwave has not been evaluated. However, no adverse events of sonographic examinations in this patient group have been reported. AIMS: The aim of the present study was to evaluate the safety of TE in patients with PM or ICD...
November 17, 2016: Digestive and Liver Disease
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