Read by QxMD icon Read


Ewa Zalewska, Malgorzata Gawel
OBJECTIVES: The aim of our study was to verify the effectiveness of single fiber potential (SFP) criteria in cases when the potential recorded using single fiber electrode (SFE) or concentric needle electrode (CNE) is contaminated by distant fibers. METHODS: Morphological counterparts of SFP were studied using computer simulations. In this study, we examined triphasic potentials using a model of a linear source of SFP. The criteria defining SFP in the case of SFP contaminated by distant fibers were analyzed, and the effect of second fiber contamination on jitter and fiber diameter determination evaluated...
October 13, 2018: Neurophysiologie Clinique, Clinical Neurophysiology
Augusto Ronchini Ximenes, Preethi Padmanabhan, Edoardo Charbon
Direct time-of-flight (dTOF) image sensors require accurate and robust timing references for precise depth calculation. On-chip timing references are well-known and understood, but for imaging systems where several thousands of pixels require seamless references, area and power consumption limit the use of more traditional synthesizers, such as phase/delay-locked loops (PLLs/DLLs). Other methods, such as relative timing measurement (start/stop), require constant foreground calibration, which is not feasible for outdoor applications, where conditions of temperature, background illumination, etc...
October 11, 2018: Sensors
Joanna Jackowska, Hanna Klimza, Natalia Zagozda, Marc Remacle, Waldemar Wojnowski, Krzysztof Piersiala, Małgorzata Wierzbicka
RATIONALE: The coincidence of an idiopathic unilateral vocal fold paresis and hereditary hemorrhagic telenagiectasia (HHT) is extremely rare and has not been described in the available literature yet. PATIENTS CONCERNS: A 55-year-old female was admitted to hospital due to acute onset of hoarseness, voice fatigue, and effort dyspnea. In the past, the patient was diagnosed with HHT and on admission presented characteristic vascular lesions in the oral cavity. She reported also experiencing a moderate epistaxis at least once per month...
October 2018: Medicine (Baltimore)
Z Chen, D J Higley, M Beye, M Hantschmann, V Mehta, O Hellwig, A Mitra, S Bonetti, M Bucher, S Carron, T Chase, E Jal, R Kukreja, T Liu, A H Reid, G L Dakovski, A Föhlisch, W F Schlotter, H A Dürr, J Stöhr
Using ultrafast ≃2.5  fs and ≃25  fs self-amplified spontaneous emission pulses of increasing intensity and a novel experimental scheme, we report the concurrent increase of stimulated emission in the forward direction and loss of out-of-beam diffraction contrast for a Co/Pd multilayer sample. The experimental results are quantitatively accounted for by a statistical description of the pulses in conjunction with the optical Bloch equations. The dependence of the stimulated sample response on the incident intensity, coherence time, and energy jitter of the employed pulses reveals the importance of increased control of x-ray free electron laser radiation...
September 28, 2018: Physical Review Letters
N Pontius, M Beye, C Trabant, R Mitzner, F Sorgenfrei, T Kachel, M Wöstmann, S Roling, H Zacharias, R Ivanov, R Treusch, M Buchholz, P Metcalf, C Schüßler-Langeheine, A Föhlisch
We present a general experimental concept for jitter-free pump and probe experiments at free electron lasers. By generating pump and probe pulse from one and the same X-ray pulse using an optical split-and-delay unit, we obtain a temporal resolution that is limited only by the X-ray pulse lengths. In a two-color X-ray pump and X-ray probe experiment with sub 70 fs temporal resolution, we selectively probe the response of orbital and charge degree of freedom in the prototypical functional oxide magnetite after photoexcitation...
September 2018: Structural Dynamics (Melville, N.Y.)
Patrícia Pinho, Larissa Monteiro, Maria Francisca de Paula Soares, Lorena Tourinho, Ailton Melo, Ana Caline Nóbrega
PURPOSE: Investigate the association between levodopa therapy and vocal characteristics in Parkinson's disease patients. SEARCH STRATEGY: Studies published at MEDLINE, LILACS, and SciELO, from 1960 to December 2016. A systematic review and meta-analysis was performed using the following keywords: Parkinson's disease; levodopa; L-dopa; voice; speech disorders; dysphonia; dysarthria. After analyzing titles and abstracts, two independent reviewers selected all clinical trials that met the eligibility criteria and selected the articles and the data recorded in a previously standardized table...
October 4, 2018: CoDAS
Sajid Javed, Arif Mahmood, Somaya Al-Maadeed, Thierry Bouwmans, Soon Ki Jung
Moving object detection is a fundamental step in various computer vision applications. Robust Principal Component Analysis (RPCA) based methods have often been employed for this task. However, the performance of these methods deteriorates in the presence of dynamic background scenes, camera jitter, camouflaged moving objects, and/or variations in illumination. It is because of an underlying assumption that the elements in the sparse component are mutually independent, and thus the spatiotemporal structure of the moving objects is lost...
October 8, 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
Adriana Chou, Colin Schrof, Evan Polce, Maia Braden, James McMurray, Jack Jiang
OBJECTIVES: The aims of this study were to compare nondysphonic adult and pediatric voices using linear and nonlinear acoustic parameters and to evaluate the ability of adult spectrum convergence ratio (SCR) and rate of divergence (ROD) reference values to correctly identify a pediatric voice type as periodic or aperiodic. METHODS: Twenty adult and 36 pediatric nondysphonic voice samples were collected and analyzed using linear and nonlinear acoustic parameters...
October 7, 2018: Annals of Otology, Rhinology, and Laryngology
Y Xiao, T T Wang, L J Ma
Objective: To discuss the correlation of benign vocal cord lesions with occult vocal cord sulcus and the treatment of benign vocal cord lesions with occult vocal cord sulcus, through the analysis of surgical data, preoperative voice evaluation data and postoperative follow-up data of patients. Method :The data from 377 patients of benign vocal cord lesions with concealed vocal cord sulcus admitted to Beijing Tongren Hospital from 2005 to 2016 were reviewed. The follow-up time was more than half a year after surgery...
September 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
Hongyu Jiang, Fengju Sun, Zhiguo Wang, Xiaofeng Jiang, Peitian Cong, Jiahui Yin, Tao Huang, Weixi Luo, Tianyang Zhang, Rongxiao Zhai
To reduce the trigger threshold voltage of the multi-gap gas switch used for linear transformer drivers, a method is proposed by mounting resistors and capacitors in parallel with the switch gaps. Based on the circuit model of the six-gap gas switch, the gap voltage distribution during the triggering process is analyzed. When the multi-gap gas switch is triggered, the voltage distribution between gaps is mainly determined by the stray capacitance between electrodes. In such condition, the trigger voltage is not fully applied on the trigger gap, and as a consequence, a higher trigger voltage is required for obtaining a low jitter...
September 2018: Review of Scientific Instruments
Yuansheng Li, Jun Liu, Weifan Xu, Haolong Xiao, Zongheng Zhang, Xingru Zhang, Mengbing He
This paper presents a low-jitter, low-trigger-threshold, high-dielectric-constant ceramic, plasma-triggered gas switch developed for pulsed power generators. We also discuss the principles behind the switch and the experiments and numerical calculations used. The electron emission and surface flashover in the trigger structure are used to create the initial plasma for switch breakdown. The experimental results show that the switch is triggered stably with a negative pulse of -50 kV peak and has a breakdown delay time jitter of 2-3 ns...
September 2018: Review of Scientific Instruments
Bin-Xiong Yu, Jian-Cang Su, Rui Li, Jie Cheng, Lei Zheng, Zeng Bo, Xiu-Dong Xu, Peng-Cheng Gao
A quasi-coaxial high-voltage (HV) rolled pulse forming line (rolled PFL) is researched in this paper. The PFL is rolled n circles on a support cylinder simultaneously by two layers of copper foil electrodes and two layers of insulation dielectrics. The first circle of the two electrodes are elicited in opposite directions along the axis, acting as the quasi-coaxial output structure of the PFL, and the left n - 1 circles of the PFL form a complete rolled strip line of n - 1 circles. The rolled PFL is convenient to realize HV insulation and is able to output a pulse with good quality...
September 2018: Review of Scientific Instruments
Pan-Wei Huang, Biao Tang, Zong-Yuan Xiong, Jia-Qi Zhong, Jin Wang, Ming-Sheng Zhan
The optical shutter is an important component for atom-interferometry-based precision measurements. To decrease its vibration noise and improve its performance, we present a compact design with a direct current motor and a photodetector inserted in a compact aluminum structure. The photodetector in the blade is driven by the motor to move either in or out of the way of the laser beam. This design can suppress laser intensity fluctuation down to 0.26% over 6 h in the method of sample and hold proportional-integral-derivative feedback...
September 2018: Review of Scientific Instruments
Sachin Gandhi, Shashank Gupta, Govind Rajopadhye
PURPOSE: This study aimed at comparing phonatory outcomes between Trans-oral Laser Surgery and Radiotherapy in T1 glottic cancer. INTRODUCTION: Early glottic carcinoma, i.e. T1 stage, can be treated using trans-oral surgery, radiotherapy, or partial open surgery. Trans-oral laser (TOL) surgical techniques and Radiotherapy (RT) have undergone significant advancement in the past few years leading to a decrease in open procedures. Various studies have been published comparing voice quality after TOL surgery and RT...
September 29, 2018: European Archives of Oto-rhino-laryngology
Chanika Alahakoon, Tharaka L Dassanayake, Indika B Gawarammana, E Michael Sedgwick, Vajira S Weerasinghe, Ahmed Abdalla, Michael S Roberts, Nicholas A Buckley
BACKGROUND: Deliberate self-poisoning (DSP) using organophosphorus (OP) insecticides are a common clinical problem in Asia. OPs inhibit acetylcholine esterase (AChE), leading to over-activity of muscarinic and nicotinic cholinergic circuits. Intermediate syndrome (IMS) is mediated via prolonged nicotinic receptor stimulation at the neuromuscular junction and its onset is between 24-96 hours post ingestion. The aims of the present study were 1) to investigate whether neuromuscular junction dysfunction within the first 24 hours following exposure, quantified by jitter in single fibre electromyography (SfEMG), can predict IMS, and 2) to compare the changes in SfEMG jitter over the course of the illness among patients who developed IMS (IMS+) and those who did not (IMS-)...
2018: PloS One
Hong V Tran, Phuc T Tran-Le, Tuan V Nguyen
Unilateral vocal cord paralysis (UVCP) is a serious disorder, because it is associated with severe clinical complication and reduced quality of life. After 3 months of treatment of UVCP by autologous fat injection laryngoplasty restored voice quality, including phonation time, jitter, shimmer and noise-to-harmonic ratio. Glottal patency was reduced from 41.3 (SD 16.9) at baseline to 0.8 (SD 3.4) at month 1-3. In unilateral vocal cord paralysis, autologous fat injection is safe and highly effective in enhancing glottal parameters and voice quality outcomes...
September 27, 2018: Clinical Otolaryngology
Guofang Xiao, Ester Bonmati, Stephen Thompson, Joe Evans, John Hipwell, Daniil Nikitichev, Kurinchi Gurusamy, S Ebastien Ourselin, David J Hawkes, Brian Davidson, Matthew J Clarkson
PURPOSE: In image-guided laparoscopy optical tracking is commonly employed, but electromagnetic (EM) systems have been proposed in the literature. In this paper, we provide a thorough comparison of EM and optical tracking systems for use in image-guided laparoscopic surgery and a feasibility study of a combined, EM tracked laparoscope and laparoscopic ultrasound (LUS) image-guidance system. METHODS: We first assess the tracking accuracy of a laparoscope with two optical trackers tracking retro-reflective markers mounted on the shaft and an EM tracker with the sensor embedded at the proximal end, using a standard evaluation plate...
September 24, 2018: Medical Physics
Chawarat Rotejanaprasert, Andrew B Lawson
Quantile modeling has been seen as an alternative and useful complement to ordinary regression mainly focusing on the mean. To directly apply quantile modeling to areal data the discrete conditional quantile function of the data can be an issue. Although jittering by adding a small number from a uniform distribution to impose pseudo-continuity has been proposed, the approach can have a great influence on responses with small values. Thus we proposed an alternative to model the quantiles of relative risk for spatiotemporal areal health data within a Bayesian framework using the log-Laplace distribution...
September 18, 2018: International Journal of Environmental Research and Public Health
Chan-Gi Jeon, Shuangyou Zhang, Junho Shin, Jungwon Kim
Higher repetition-rate optical pulse trains have been desired for various applications such as high-bit-rate optical communication, photonic analogue-to-digital conversion, and multi-photon imaging. Generation of multi GHz and higher repetition-rate optical pulse trains directly from mode-locked oscillators is often challenging. As an alternative, harmonic injection locking can be applied for extra-cavity repetition-rate multiplication (RRM). Here we have investigated the operation conditions and achievable performances of all-fibre, highly tunable harmonic injection locking-based pulse RRM...
September 17, 2018: Scientific Reports
Carolina Daniela Tejeda-Franco, Victor Valadez, Xochiquetzal Hernandez-Lopez, Pablo Antonio Ysunza, Maria E Mena-Ramirez, Ricardo A Garcia-Zalapa, Antonio Miranda-Duarte
BACKGROUND: Adequate phonation is self-regulated by auditory feedback. Children with bilateral profound hearing loss (PHL) lack this feedback resulting in abnormal voice. Adequate hearing aid use and auditory-verbal therapy (AVT) may improve voice quality in deaf children. OBJECTIVE: To study whether hearing aid use and AVT approach improve acoustic parameters of voice of children with bilateral PHL. MATERIALS AND METHODS: Nineteen children with bilateral PHL were studied...
September 14, 2018: Journal of Voice: Official Journal of the Voice Foundation
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"