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https://www.readbyqxmd.com/read/28241649/iterative-compensation-of-nonlinear-error-of-heterodyne-interferometer
#1
Jiandong Xie, Liping Yan, Benyong Chen, Shihua Zhang
In order to compensate the nonlinear error of a heterodyne interferometer caused by both frequency mixing and phase demodulating electronics in real time, a novel iterative algorithm with a digital lock-in phase demodulator is proposed in this paper. By using iterative translating and scaling transforms, the phase diagram of the two output signals from phase demodulator is corrected from an ellipse with center offset to a circle at origin. As a result, the correct phase can be obtained and the nonlinear error is compensated...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28240693/clinical-simulation-learning-in-critical-care
#2
Kerstin Hudgins
Nurses are expected to master many skills, especially in critical care; thus, competency is crucial. Clinical educators must determine whether nurses who are new to the skill set have attained an acceptable level of achievement in performance; hence, are they capable of providing quality and safe patient care? Simulation learning is used in the hospital setting and largely in academic centers. Strategies include for the instructor to acquire an aspect of abilities and deficits as a basis upon which to create learning experiences that enable nurses to develop essential clinical competence...
April 2017: Critical Care Nursing Quarterly
https://www.readbyqxmd.com/read/28239734/study-of-the-role-of-oxygen-vacancies-as-active-sites-in-reduced-graphene-oxide-modified-tio2
#3
Yanhui Zhang, Rongying Dai, Shirong Hu
In recent years, substantial efforts have been devoted to exploring reduced graphene oxide/TiO2 (RGO/TiO2) composite materials; however, there is still a paucity of reports on the construction of reduced graphene oxide/TiO2 with oxygen vacancies (RGO/TiO2-OV) via a facile two-step wet chemistry approach. In this work, we show a proof-of-concept study follow RGO introduced into TiO2 with oxygen vacancies, the role of oxygen vacancies as active sites in reduced graphene oxide-modified TiO2. The photocatalytic performance and related properties of blank-TiO2, blank-TiO2 with oxygen vacancies (blank-TiO2-OV), RGO/TiO2, and RGO/TiO2-OV were comparatively studied...
February 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28239437/a-decision-tree-algorithm-for-investigation-of-model-biases-related-to-dynamical-cores-and-physical-parameterizations
#4
M Soner Yorgun, Richard B Rood
An object-based evaluation method using a pattern recognition algorithm (i.e., classification trees) is applied to the simulated orographic precipitation for idealized experimental setups using the National Center of Atmospheric Research (NCAR) Community Atmosphere Model (CAM) with the finite volume (FV) and the Eulerian spectral transform dynamical cores with varying resolutions. Daily simulations were analyzed and three different types of precipitation features were identified by the classification tree algorithm...
December 2016: Journal of Advances in Modeling Earth Systems
https://www.readbyqxmd.com/read/28238953/cost-effectiveness-of-screening-patients-with-gastroesophageal-reflux-disease-for-barrett-s-esophagus-with-a-minimally-invasive-cell-sampling-device
#5
Curtis R Heberle, Amir-Houshang Omidvari, Ayman Ali, Sonja Kroep, Chung Yin Kong, John M Inadomi, Joel H Rubenstein, Angela C Tramontano, Emily C Dowling, William D Hazelton, E Georg Luebeck, Iris Lansdorp-Vogelaar, Chin Hur
BACKGROUND & AIMS: It is important to identify patients with Barrett's esophagus (BE), the precursor to esophageal adenocarcinoma (EAC). Patients with BE are usually identified by endoscopy, which is expensive. The cytosponge, which collects tissue from the esophagus non-invasively, could be a cost-effective tool for screening individuals with gastroesophageal reflux disease (GERD), who are at increased risk for BE. We developed a model to analyze the cost effectiveness of using cytosponge in first-line screening of patients with GERD for BE with endoscopic confirmation, compared to endoscopy screening only, METHODS: We incorporated data from a large clinical trial of cytosponge performance into 2 validated microsimulation models of EAC progression (the esophageal adenocarcinoma model from the Massachusetts General Hospital and the microsimulation screening analysis model from Erasmus University Medical Center)...
February 23, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28238257/enhanced-extraction-of-silicon-vacancy-centers-light-emission-using-bottom-up-engineered-polycrystalline-diamond-photonic-crystal-slabs
#6
Lukáš Ondič, Marian Varga, Karel Hruska, Jan Fait, Peter Kapusta
Silicon vacancy (SiV) centers are optically active defects in diamond. The SiV centers, in contrast to nitrogen vacancy (NV) centers, possess narrow and efficient luminescence spectrum (centered at ≈738 nm) even at room temperature, which can be utilized for quantum photonics and sensing applications. However, most of light generated in diamond is trapped in the material due to the phenomenon of total internal reflection. In order to overcome this issue, we have prepared two-dimensional photonic crystal slabs from polycrystalline diamond thin layers with high density of SiV centers employing bottom-up growth on quartz templates...
February 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28237938/game-theoretic-analysis-of-cooperative-message-forwarding-in-opportunistic-mobile-networks
#7
Sujata Pal, Barun Kumar Saha, Sudip Misra
In cooperative communication, a set of players forming a coalition ensures communal behavior among themselves by helping one another in message forwarding. Opportunistic mobile networks (OMNs) require multihop communications for transferring messages from the source to the destination nodes. However, noncooperative nodes only forward their own messages to others, and drop others' messages upon receiving them. So, the message delivery overhead increases in OMN. For minimizing the overhead and maximizing the delivery rate, we propose two coalition-based cooperative schemes: 1) simple coalition formation (SCF) and 2) overlapping coalition formation (OCF) game...
February 21, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28236644/theoretical-dosimetric-evaluation-of-carbon-and-oxygen-minibeam-radiation-therapy
#8
Wilfredo González, Cécile Peucelle, Yolanda Prezado
PURPOSE: Charged particles have several advantages over x-rays radiations, both in terms of physics and radiobiology. The combination of these advantages with those of minibeam radiation therapy (MBRT) could help enhancing the therapeutic index for some cancers with poor prognosis. Among the different ions explored for therapy, carbon ions are considered to provide the optimum physical and biological characteristics. Oxygen could be advantageous due to a reduced oxygen enhancement ratio along with a still moderate biological entrance dose...
February 25, 2017: Medical Physics
https://www.readbyqxmd.com/read/28236135/deriving-theoretical-phase-locking-values-of-a-coupled-cortico-thalamic-neural-mass-model-using-center-manifold-reduction
#9
Yutaro Ogawa, Ikuhiro Yamaguchi, Kiyoshi Kotani, Yasuhiko Jimbo
Cognitive functions such as sensory processing and memory processes lead to phase synchronization in the electroencephalogram or local field potential between different brain regions. There are a lot of computational researches deriving phase locking values (PLVs), which are an index of phase synchronization intensity, from neural models. However, these researches derive PLVs numerically. To the best of our knowledge, there have been no reports on the derivation of a theoretical PLV. In this study, we propose an analytical method for deriving theoretical PLVs from a cortico-thalamic neural mass model described by a delay differential equation...
February 24, 2017: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/28235374/energy-of-the-isolated-metastable-iron-nickel-fcc-nanocluster-with-a-carbon-atom-in-the-tetragonal-interstice
#10
Natalya V Bondarenko, Anatoliy V Nedolya
The energy of the isolated iron-nickel nanocluster was calculated by molecular mechanics method using Lennard-Jones potential. The cluster included a carbon atom that drifted from an inside octahedral interstice to a tetrahedral interstice in [Formula: see text] direction and after that in <222> direction to the surface. In addition, one of 14 iron atoms was replaced by a nickel atom, the position of which was changing during simulation.The energy of the nanocluster was estimated at the different interatomic distances...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28228033/growth-of-defect-free-colloidal-hard-sphere-crystals-using-colloidal-epitaxy
#11
Tonnishtha Dasgupta, John R Edison, Marjolein Dijkstra
Using event-driven Brownian dynamics simulations, we investigate the epitaxial growth of hard-sphere crystals with a face-centered-cubic (fcc) structure on the three densest cross-sectional planes of the fcc: (i) fcc (100), (ii) fcc (111), and (iii) fcc (110). We observe that for high settling velocities, large fcc crystals with very few extended defects grow on the fcc (100) template. Our results show good agreement with the experiments of Jensen et al. [Soft Matter 9, 320 (2013)], who observed such large fcc crystals upon centrifugation on an fcc (100) template...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28228020/coarse-grained-simulations-of-cis-and-trans-polybutadiene-a-bottom-up-approach
#12
Claire A Lemarchand, Marc Couty, Bernard Rousseau
We apply the dissipative particle dynamics strategy proposed by Hijón et al. [Faraday Discuss. 144, 301-322 (2010)] and based on an exact derivation of the generalized Langevin equation to cis- and trans-1,4-polybutadiene. We prove that it is able to reproduce not only the structural but also the dynamical properties of these polymers without any fitting parameter. A systematic study of the effect of the level of coarse-graining is done on cis-1,4-polybutadiene. We show that as the level of coarse-graining increases, the dynamical properties are better and better reproduced while the structural properties deviate more and more from those calculated in molecular dynamics (MD) simulations...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28227622/energy-harvesting-from-human-walking-to-power-biomedical-devices-using-oscillating-generation
#13
Jose A Montoya, Dulce M Mariscal, Edwar Romero, Jose A Montoya, Dulce M Mariscal, Edwar Romero, Dulce M Mariscal, Jose A Montoya, Edwar Romero
This work summarizes the energy generation limits from walking employing a pendulum-based generation system. Self-winding wristwatches have exploited successfully this energy input technique for decades. Pendulum-based planar devices use the rotation to produce energy for inertial generators. Then the oscillations of body motion during locomotion present an opportunity to extract kinetic energy from planar generators. The sinusoidal motion of the center of gravity of the body, on the sagittal and frontal planes, and the limbs swinging are compliant with oscillating devices...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227453/a-simple-mathematical-model-of-spontaneous-swallow-effects-on-breathing-based-on-new-experimental-data
#14
Julie Fontecave-Jallon, Pierre Baconnier, Julie Fontecave-Jallon, Pierre Baconnier, Pierre Baconnier, Julie Fontecave-Jallon
The coordination of respiration and swallowing involves an interaction between two central pattern generators, and this can be disturbed in some pathological situations. To better understand this interaction, we aim in this study to characterize the effect of a spontaneous swallow on the breathing pattern. This is first realized using Respiratory Inductive Plethysmography on 11 healthy subjects. Real signals highlight several mechanisms for swallowing: ending of inspiration, prolongation of expiration or active expiration...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227157/meandered-conformai-antenna-for-ism-band-ingestible-capsule-communication-systems
#15
Md Shamsul Arefin, Jean-Michel Redoute, Mehmet Rasit Yuce, Md Shamsul Arefin, Jean-Michel Redoute, Mehmet Rasit Yuce, Jean-Michel Redoute
The wireless capsule has been used to measure physiological parameters in the gastrointestinal tract where communication from in-body to external receiver is necessary using a miniaturized antenna with high gain and onmidirectional radiation pattern. This paper presents a meandered conformal antenna with center frequency of 433 MHz for a wireless link between an in-body capsule system and an ex-body receiver system. The antenna is wrapped around the wireless capsule, which provides extra space for other circuits and sensors inside the capsule as well as allows it having larger dimensions compared to inner antennas...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226979/quantitative-assessment-of-arm-tremor-in-people-with-neurological-disorders
#16
Jeonghee Kim, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Jeonghee Kim, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Claire Parnell, Thomas Wichmann, Stephen P DeWeerth, Jeonghee Kim
Abnormal oscillatory movement (i.e. tremor) is usually evaluated with qualitative assessment by clinicians, and quantified with subjective scoring methods. These methods are often inaccurate. We utilized a quantitative and standardized task based on the Fitts' law to assess the performance of arm movement with tremor by controlling a gyration mouse on a computer. The experiment included the center-out tapping (COT) and rectangular track navigation (RTN) tasks. We report the results of a pilot study in which we collected the performance for healthy participants in whom tremor was simulated by imposing oscillatory movements to the arm with a vibration motor...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226962/a-self-aligning-knee-joint-for-walking-assistance-devices
#17
Byungjune Choi, Younbaek Lee, Jeonghun Kim, Minhyung Lee, Jongwon Lee, Se-Gon Roh, Hyundo Choi, Yong-Jae Kim, Jung-Yun Choi, Byungjune Choi, Younbaek Lee, Jeonghun Kim, Minhyung Lee, Jongwon Lee, Se-Gon Roh, Hyundo Choi, Yong-Jae Kim, Jung-Yun Choi, Minhyung Lee, Hyundo Choi, Younbaek Lee, Jung-Yun Choi, Se-Gon Roh, Jongwon Lee, Yong-Jae Kim, Jeonghun Kim, Byungjune Choi
This paper presents a novel self-aligning knee mechanism for walking assistance devices for the elderly to provide physical gait assistance. Self-aligning knee joints can assist in flexion/extension motions of the knee joint and compensate the knee's transitional movements in the sagittal plane. In order to compensate the center of rotation, which moves with the flexion/extension motion of the human knee joint, a self-aligning knee joint is proposed that adds redundant degrees of freedom (i.e., 2-DoF) to the 1-DoF revolute joint...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226690/polarity-detection-in-ultrasound-current-source-density-imaging
#18
Zhaohui Wang, Wei-Da Hao, Chung S Leung, Sung-Won Park, Zhaohui Wang, Wei-Da Hao, Chung S Leung, Sung-Won Park, Chung S Leung, Zhaohui Wang, Sung-Won Park, Wei-Da Hao
Modulating the electric dipole field with ultrasound pulse, ultrasound current source density imaging (UCSDI) can detect current direction and form spatial 3D imaging of dipole changing in one period of treatment. As ultrasound pulse passes through the conductive media, it convolves/correlates with the inner product of the electric field of a dipole and lead field of a pair of detectors, making the shifting frequency of polarity lower than the center frequency of the ultrasound pulse. After acoustoelectric (AE) signal is shifted to base band, the AE voltage is positive at anode and negative at cathode...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226545/a-novel-catheter-guidance-algorithm-for-localization-of-atrial-fibrillation-rotor-and-focal-sources
#19
Anthony J Salmin, Prasanth Ganesan, Kristina E Shillieto, Elizabeth M Cherry, David T Huang, Arkady M Pertsov, Behnaz Ghoraani, Anthony J Salmin, Prasanth Ganesan, Kristina E Shillieto, Elizabeth M Cherry, David T Huang, Arkady M Pertsov, Behnaz Ghoraani, Arkady M Pertsov, Behnaz Ghoraani, Anthony J Salmin, Kristina E Shillieto, Elizabeth M Cherry, Prasanth Ganesan, David T Huang
Locating atrial fibrillation (AF) focal and rotor sources can help improve target ablation therapy for AF. However, it remains unclear how to use the information provided by multi-polar diagnostic catheters (MPDC) to locate AF sources. Our aim was to develop a catheter-guidance algorithm to locate AF focal and rotor sources using a conventional MPDC. We simulated a 10 cm × 10 cm atrial tissue with focal and rotor sources using the Nygren et al. ionic model. We modeled a Lasso MPDC with 20-unipole electrodes placed with a spacing of 4...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226543/development-of-a-novel-probabilistic-algorithm-for-localization-of-rotors-during-atrial-fibrillation
#20
Prasanth Ganesan, Anthony Salmin, Elizabeth M Cherry, Behnaz Ghoraani, Prasanth Ganesan, Anthony Salmin, Elizabeth M Cherry, Behnaz Ghoraani, Elizabeth M Cherry, Prasanth Ganesan, Behnaz Ghoraani, Anthony Salmin
Atrial fibrillation (AF) is an irregular heart rhythm that can lead to stroke and other heart-related complications. Catheter ablation has been commonly used to destroy triggering sources of AF in the atria and consequently terminate the arrhythmia. However, efficient and accurate localization of the AF sustaining sources known as rotors is a major challenge in catheter ablation. In this paper, we developed a novel probabilistic algorithm that can adaptively guide a Lasso diagnostic catheter to locate the center of a rotor...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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