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https://www.readbyqxmd.com/read/27927034/addressing-challenges-for-youths-with-mobility-devices-in-winter-conditions
#1
Ernesto Morales, Sally Lindsay, Geoffrey Edwards, Lori Howell, Claude Vincent, Nicole Yantzi, Véronique Gauthier
PURPOSE: Winter-related research about the experience of navigating in the urban context has mostly focused on the elderly population with physical disabilities. The aim of this project was to explore potential design solutions to enhance young people's mobility devices and the built environment to improve accessibility and participation in winter. METHODS: A multi-method qualitative design process included the following steps: (1) in-depth interviews; (2) photo elicitation; (3) individual co-design sessions; and (4) group co-design sessions (i...
December 7, 2016: Disability and Rehabilitation
https://www.readbyqxmd.com/read/27920441/nanotechnology-for-environmentally-sustainable-electromobility
#2
Linda Ager-Wick Ellingsen, Christine Roxanne Hung, Guillaume Majeau-Bettez, Bhawna Singh, Zhongwei Chen, M Stanley Whittingham, Anders Hammer Strømman
Electric vehicles (EVs) powered by lithium-ion batteries (LIBs) or proton exchange membrane hydrogen fuel cells (PEMFCs) offer important potential climate change mitigation effects when combined with clean energy sources. The development of novel nanomaterials may bring about the next wave of technical improvements for LIBs and PEMFCs. If the next generation of EVs is to lead to not only reduced emissions during use but also environmentally sustainable production chains, the research on nanomaterials for LIBs and PEMFCs should be guided by a life-cycle perspective...
December 6, 2016: Nature Nanotechnology
https://www.readbyqxmd.com/read/27910595/cleaning-of-first-mirrors-in-iter-by-means-of-radio-frequency-discharges
#3
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/27892964/temporally-coherent-terawatt-attosecond-xfel-synchronized-with-a-few-cycle-laser
#4
Sandeep Kumar, Yong Woon Parc, Alexandra S Landsman, Dong Eon Kim
Attosecond metrology using laser-based high-order harmonics has been significantly advanced and applied to various studies of electron dynamics in atoms, molecules and solids. Laser-based high-order harmonics have a limitation of low power and photon energies. There is, however, a great demand for even higher power and photon energy. Here, we propose a scheme for a terawatt attosecond (TW-as) X-ray pulse in X-ray free-electron laser controlled by a few cycle IR pulse, where one dominant current spike in an electron bunch is used repeatedly to amplify a seeded radiation to a terawatt level...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27877911/a-perspective-on-the-recent-progress-in-solution-processed-methods-for-highly-efficient-perovskite-solar-cells
#5
Ashwith Chilvery, Sanjib Das, Padmaja Guggilla, Christina Brantley, Anderson Sunda-Meya
Perovskite solar cells (PSCs) were developed in 2009 and have led to a number of significant improvements in clean energy technology. The power conversion efficiency (PCE) of PSCs has increased exponentially and currently stands at 22%. PSCs are transforming photovoltaic (PV) technology, outpacing many established PV technologies through their versatility and roll-to-roll manufacturing compatibility. The viability of low-temperature and solution-processed manufacturing has further improved their viability. This article provides a brief overview of the stoichiometry of perovskite materials, the engineering behind various modes of manufacturing by solution processing methods, and recommendations for future research to achieve large-scale manufacturing of high efficiency PSCs...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27870696/strength-and-conditioning-and-concurrent-training-practices-in-elite-rugby-union
#6
Thomas W Jones, Andrew Smith, Lindsay S Macnaughton, Duncan N French
Jones, TW, Smith, A, Macnaughton, LS, and French, DN. Strength and Conditioning and Concurrent Training Practices in Elite Rugby Union. J Strength Cond Res 30(12): 3354-3366, 2016-There is limited published research on strength and conditioning (S&C) practices in elite rugby union (RU). Information regarding testing batteries and programme design would provide valuable information to both applied practitioners and researchers investigating the influence of training interventions or preperformance strategies...
December 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27857327/airborne-forward-pointing-uv-rayleigh-lidar-for-remote-clear-air-turbulence-detection-system-design-and-performance
#7
Patrick Vrancken, Martin Wirth, Gerhard Ehret, Hervé Barny, Philippe Rondeau, Henk Veerman
A high-performance airborne UV Rayleigh lidar system was developed within the European project DELICAT. With its forward-pointing architecture, it aims at demonstrating a novel detection scheme for clear air turbulence (CAT) for an aeronautics safety application. Due to its occurrence in clear and clean air at high altitudes (aviation cruise flight level), this type of turbulence evades microwave radar techniques and in most cases coherent Doppler lidar techniques. The present lidar detection technique relies on air density fluctuation measurement and is thus independent of backscatter from hydrometeors and aerosol particles...
November 10, 2016: Applied Optics
https://www.readbyqxmd.com/read/27853413/using-lempel-ziv-complexity-to-assess-ecg-signal-quality
#8
Yatao Zhang, Shoushui Wei, Costanzo Di Maria, Chengyu Liu
The poor quality of wireless electrocardiography (ECG) recordings can lead to misdiagnosis and waste of medical resources. This study presents an interpretation of Lempel-Ziv (LZ) complexity in terms of ECG quality assessment, and verifies its performance on real ECG signals. Firstly, LZ complexities for typical signals, namely high-frequency (HF) noise, low-frequency (LF) noise, power-line (PL) noise, impulse (IM) noise, clean artificial ECG signals, and ECG signals with various types of noise added (ECG plus HF, LF, PL, and IM noise, respectively) were analyzed...
2016: Journal of Medical and Biological Engineering
https://www.readbyqxmd.com/read/27845652/a-fixed-lag-kalman-smoother-to-filter-power-line-interference-in-electrocardiogram-recordings
#9
Guy J J Warmerdam, Rik Vullings, Lars Schmitt, Judith O E H van Laar, Jan W M Bergmans
OBJECTIVE: Filtering power line interference (PLI) from electrocardiogram (ECG) recordings can lead to significant distortions of the ECG and mask clinically relevant features in ECG waveform morphology. The objective of this study is to filter PLI from ECG recordings with minimal distortion of the ECG waveform. METHODS: In this paper, we propose a fixed-lag Kalman smoother with adaptive noise estimation. The performance of this Kalman smoother in filtering PLI is compared to that of a fixedbandwidth notch filter and several adaptive PLI filters that have been proposed in the literature...
November 8, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27836356/effectiveness-of-senna-vs-polyethylene-glycol-as-laxative-therapy-in-children-with-constipation-related-to-anorectal-malformation
#10
Karla Alejandra Santos-Jasso, José Luis Arredondo-García, Jorge Maza-Vallejos, Pablo Lezama-Del Valle
PURPOSE: Constipation is present in 80% of children with corrected anorectal malformations, usually associated to rectal dilation and hypomotility. Osmotic laxatives are routinely used for idiopathic constipation. Senna is a stimulant laxative that produces contractions improving colonic motility without affecting the stool consistency. We designed this trial to study the effectiveness of Senna versus polyethylene glycol for the treatment of constipation in children with anorectal malformation...
October 27, 2016: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/27831896/constrained-low-rank-representation-for-robust-subspace-clustering
#11
Jing Wang, Xiao Wang, Feng Tian, Chang Hong Liu, Hongchuan Yu
Subspace clustering aims to partition the data points drawn from a union of subspaces according to their underlying subspaces. For accurate semisupervised subspace clustering, all data that have a must-link constraint or the same label should be grouped into the same underlying subspace. However, this is not guaranteed in existing approaches. Moreover, these approaches require additional parameters for incorporating supervision information. In this paper, we propose a constrained low-rank representation (CLRR) for robust semisupervised subspace clustering, based on a novel constraint matrix constructed in this paper...
October 31, 2016: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/27828402/self-frequency-shifted-solitons-in-a-polarization-maintaining-very-large-mode-area-er-doped-fiber-amplifier
#12
J W Nicholson, A Desantolo, W Kaenders, A Zach
We demonstrate soliton self-frequency-shifted, femtosecond-pulse amplification in a newly-developed, polarization-maintaining, Er-doped, very-large-mode-area fiber amplifier. The PM-VLMA Er fiber had a core diameter of 50 μm, an effective area of ~1050 μm<sup>2</sup>, and Er absorption of 50 dB/m. The measured birefringence beat length of the PM-VLMA Er fiber was 14.1 mm. The soliton wavelength could be shifted by more than 90 nm. The soliton generation process resulted in remarkably clean, 86 fs pulses with 21 nJ energy at 1650 nm and 244 kW peak power from an all-fiber, fusion spliced system without bulk-optics for pulse compression...
October 3, 2016: Optics Express
https://www.readbyqxmd.com/read/27827887/a-conversation-on-data-mining-strategies-in-lc-ms-untargeted-metabolomics-pre-processing-and-pre-treatment-steps
#13
Fidele Tugizimana, Paul A Steenkamp, Lizelle A Piater, Ian A Dubery
Untargeted metabolomic studies generate information-rich, high-dimensional, and complex datasets that remain challenging to handle and fully exploit. Despite the remarkable progress in the development of tools and algorithms, the "exhaustive" extraction of information from these metabolomic datasets is still a non-trivial undertaking. A conversation on data mining strategies for a maximal information extraction from metabolomic data is needed. Using a liquid chromatography-mass spectrometry (LC-MS)-based untargeted metabolomic dataset, this study explored the influence of collection parameters in the data pre-processing step, scaling and data transformation on the statistical models generated, and feature selection, thereafter...
November 3, 2016: Metabolites
https://www.readbyqxmd.com/read/27827376/a-metal-organic-cage-incorporating-multiple-light-harvesting-and-catalytic-centres-for-photochemical-hydrogen-production
#14
Sha Chen, Kang Li, Fang Zhao, Lei Zhang, Mei Pan, Yan-Zhong Fan, Jing Guo, Jianying Shi, Cheng-Yong Su
Photocatalytic water splitting is a natural but challenging chemical way of harnessing renewable solar power to generate clean hydrogen energy. Here we report a potential hydrogen-evolving photochemical molecular device based on a self-assembled ruthenium-palladium heterometallic coordination cage, incorporating multiple photo- and catalytic metal centres. The photophysical properties are investigated by absorption/emission spectroscopy, electrochemical measurements and preliminary DFT calculations and the stepwise electron transfer processes from ruthenium-photocentres to catalytic palladium-centres is probed by ultrafast transient absorption spectroscopy...
November 9, 2016: Nature Communications
https://www.readbyqxmd.com/read/27820725/training-strategies-to-improve-muscle-power-is-olympic-style-weightlifting-relevant
#15
Christian Helland, Eirik Hole, Erik Iversen, Monica Charlotte Olsson, Olivier Seynnes, Paul Andre Solberg, Gøran Paulsen
INTRODUCTION: This efficacy study investigated the effects of (1) Olympic-style weightlifting (OWL), (2) motorized strength and power training (MSPT), and (3) free weight strength and power training (FSPT) on muscle power. METHODS: Thirty-nine young athletes (20±3 yr.; ice hockey, volleyball and badminton) were randomized into the three training groups. All groups participated in 2-3 sessions/week for 8 weeks. The MSPT and FSPT groups trained using squats (two legs and single leg) with high force and high power, while the OWL group trained using clean and snatch exercises...
November 3, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27814990/the-effect-of-written-posted-instructions-on-collection-of-clean-catch-urine-specimens-in-the-emergency-department
#16
Patrick Joseph Maher, Alisha Emily Cutler Brown, Medley O'Keefe Gatewood
BACKGROUND: Urinalysis testing is frequently ordered in the emergency department (ED), but contamination of urine specimens limits the interpretation of results. The mid-stream, clean-catch (MSCC) procedure for urine specimen collection is recommended to decrease contamination rates, but without instructions this procedure has poor compliance. OBJECTIVE: To evaluate the effectiveness of written instructions alone, we analyzed the rate of specimen contamination, defined by presence of squamous epithelial cells (SECs) and culture results, in the ED after posting information on the MSCC procedure...
November 1, 2016: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/27814489/chromatin-starts-to-come-clean
#17
Shengjiang Tu, Gary LeRoy, Danny Reinberg
In an effort to identify a chromatin-associated pluripotent network, Rafiee et al., (2016) developed a powerful ChIP-MS technique and discovered a novel protein, TRIM24, enriched on OCT4-, SOX2-, and NANOG-associated chromatin, paving the way for future proteomic studies on chromatin.
November 3, 2016: Molecular Cell
https://www.readbyqxmd.com/read/27792308/viability-of-carbon-capture-and-sequestration-retrofits-for-existing-coal-fired-power-plants-under-an-emission-trading-scheme
#18
Shuchi K Talati, Haibo Zhai, M Granger Morgan
Using data on the coal-fired electric generating units (EGUs) in Texas we assess the economic feasibility of retrofitting existing units with carbon capture and sequestration (CCS) in order to comply with the Clean Power Plan's rate-based emission standards under an emission trading scheme. CCS with 90% capture is shown to be more economically attractive for a range of existing units than purchasing emission rate credits (ERCs) from a trading market at an average credit price above $28 per MWh under the final state standard and $35 per MWh under the final national standard...
October 28, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27768078/manufacture-and-drug-delivery-applications-of-silk-nanoparticles
#19
Thidarat Wongpinyochit, Blair F Johnston, F Philipp Seib
Silk is a promising biopolymer for biomedical and pharmaceutical applications due to its outstanding mechanical properties, biocompatibility and biodegradability, as well its ability to protect and subsequently release its payload in response to a trigger. While silk can be formulated into various material formats, silk nanoparticles are emerging as promising drug delivery systems. Therefore, this article covers the procedures for reverse engineering silk cocoons to yield a regenerated silk solution that can be used to generate stable silk nanoparticles...
October 8, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27763522/effectiveness-testing-of-a-piezoelectric-energy-harvester-for-an-automobile-wheel-using-stochastic-resonance
#20
Yunshun Zhang, Rencheng Zheng, Keisuke Shimono, Tsutomu Kaizuka, Kimihiko Nakano
The collection of clean power from ambient vibrations is considered a promising method for energy harvesting. For the case of wheel rotation, the present study investigates the effectiveness of a piezoelectric energy harvester, with the application of stochastic resonance to optimize the efficiency of energy harvesting. It is hypothesized that when the wheel rotates at variable speeds, the energy harvester is subjected to on-road noise as ambient excitations and a tangentially acting gravity force as a periodic modulation force, which can stimulate stochastic resonance...
October 17, 2016: Sensors
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