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https://www.readbyqxmd.com/read/27936271/multiple-stage-ambiguity-in-motion-perception-reveals-global-computation-of-local-motion-directions
#1
Andrew T Rider, Shin'ya Nishida, Alan Johnston
The motion of a 1D image feature, such as a line, seen through a small aperture, or the small receptive field of a neural motion sensor, is underconstrained, and it is not possible to derive the true motion direction from a single local measurement. This is referred to as the aperture problem. How the visual system solves the aperture problem is a fundamental question in visual motion research. In the estimation of motion vectors through integration of ambiguous local motion measurements at different positions, conventional theories assume that the object motion is a rigid translation, with motion signals sharing a common motion vector within the spatial region over which the aperture problem is solved...
December 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27936077/routine-vaccination-coverage-in-northern-nigeria-results-from-40-district-level-cluster-surveys-2014-2015
#2
Rajni Gunnala, Ikechukwu U Ogbuanu, Oluwasegun J Adegoke, Heather M Scobie, Belinda V Uba, Kathleen A Wannemuehler, Alicia Ruiz, Hashim Elmousaad, Chima J Ohuabunwo, Mahmud Mustafa, Patrick Nguku, Ndadilnasiya Endie Waziri, John F Vertefeuille
BACKGROUND: Despite recent success towards controlling poliovirus transmission, Nigeria has struggled to achieve uniformly high routine vaccination coverage. A lack of reliable vaccination coverage data at the operational level makes it challenging to target program improvement. To reliably estimate vaccination coverage, we conducted district-level vaccine coverage surveys using a pre-existing infrastructure of polio technical staff in northern Nigeria. METHODS: Household-level cluster surveys were conducted in 40 polio high risk districts of Nigeria during 2014-2015...
2016: PloS One
https://www.readbyqxmd.com/read/27935178/simple-additive-simulation-overestimates-real-influence-altered-nitrogen-and-rainfall-modulate-the-effect-of-warming-on-soil-carbon-fluxes
#3
Xiangyin Ni, Wanqin Yang, Zemin Qi, Shu Liao, Zhenfeng Xu, Bo Tan, Bin Wang, Qinggui Wu, Changkun Fu, Chengming You, Fuzhong Wu
Experiments and models have led to a consensus that there is positive feedback between carbon (C) fluxes and climate warming. However, the effect of warming may be altered by regional and global changes in nitrogen (N) and rainfall levels, but the current understanding is limited. Through synthesizing global data on soil C pool, input and loss from experiments simulating N deposition, drought and increased precipitation, we quantified the responses of soil C fluxes and equilibrium to the three single factors and their interactions with warming...
December 9, 2016: Global Change Biology
https://www.readbyqxmd.com/read/27934398/energetic-and-dynamic-analysis-of-transport-of-na-and-k-through-a-cyclic-peptide-nanotube-in-water-and-in-lipid-bilayers
#4
Yeonho Song, Ji Hye Lee, Hoon Hwang, George C Schatz, Hyonseok Hwang
Potential of mean force (PMF) profiles and position-dependent diffusion coefficients of Na(+) and K(+) are calculated to elucidate the translocation of ions through a cyclic peptide nanotube, composed of 8 × cyclo[-(d-Leu-Trp)4-] rings, in water and in hydrated DMPC bilayers. The PMF profiles and PMF decomposition analysis for the monovalent cations show that favorable interactions of the cations with the CPN as well as the lipid bilayer and dehydration free energy penalties are two major competing factors which determine the free energy surface for ion transport through CPNs both in water and in lipid bilayers, and that the selectivity of CPNs to cations mainly arises from favorable interaction energies of cations with CPNs and lipid bilayers that are more dominant than the dehydration penalties...
November 23, 2016: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/27933359/raccoons-procyon-lotor-as-sentinels-of-trace-element-contamination-and-physiological-effects-of-exposure-to-coal-fly-ash
#5
Felipe Hernández, Ricki E Oldenkamp, Sarah Webster, James C Beasley, Lisa L Farina, Samantha M Wisely
Anthropogenic pollutants disrupt global biodiversity, and terrestrial sentinels of pollution can provide a warning system for ecosystem-wide contamination. This study sought to assess whether raccoons (Procyon lotor) are sentinels of local exposure to trace element contaminants at a coal fly ash site and whether exposure resulted in health impairment or changes in the intestinal helminth communities. We compared trace element accumulation and the impact on health responses and intestinal helminth communities of raccoons inhabiting contaminated and reference sites of the U...
December 8, 2016: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/27932343/influence-of-the-day-care-home-and-neighbourhood-environment-on-young-children-s-physical-activity-and-health-protocol-for-the-playce-observational-study
#6
Hayley Christian, Clover Maitland, Stephanie Enkel, Georgina Trapp, Stewart G Trost, Jasper Schipperijn, Bryan Boruff, Leanne Lester, Michael Rosenberg, Stephen R Zubrick
INTRODUCTION: The early years are a critical period in a child's health and development, yet most preschool children fail to meet physical activity guidelines. Outside of the home and neighbourhood, children spend a large proportion of time within early childhood education and care (ECEC) services such as long day care. Research is required to determine how the design of day care outdoor (and indoor) spaces provides opportunities or constraints for physical activity. A significant evidence gap surrounds what objectively measured attributes of the home and neighbourhood environment influence preschoolers' physical activity...
December 8, 2016: BMJ Open
https://www.readbyqxmd.com/read/27930446/prediction-of-overuse-injuries-in-professional-u18-u21-footballers-using-metrics-of-training-distance-and-intensity
#7
Christopher S Bacon, Alexis R Mauger
The most common injury in professional football is an overuse injury to the lower limb. A significant external risk factor of this injury is the mismanagement of training and match loads. The aim of the current study was to examine the predictability of overuse injuries in professional youth soccer players using volume and intensity variables derived from Global Positioning Systems (GPS). A total of 41 players (Age - 17.8 yrs±1.1 yrs) training and match loads were assessed. These external loads were measured over two competitive seasons for every training session and match for each individual...
November 19, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27929390/a-geometry-based-cycle-slip-detection-and-repair-method-with-time-differenced-carrier-phase-tdcp-for-a-single-frequency-global-position-system-gps-beidou-navigation-satellite-system-bds-receiver
#8
Chuang Qian, Hui Liu, Ming Zhang, Bao Shu, Longwei Xu, Rufei Zhang
As the field of high-precision applications based on carriers continues to expand, the development of low-cost, small, modular receivers and their application in diverse scenarios and situations with complex data quality has increased the requirements of carrier-phase data preprocessing. A new geometry-based cycle slip detection and repair method based on Global Position System (GPS) + BeiDou Navigation Satellite System (BDS) is proposed. The method uses a Time-differenced Carrier Phase (TDCP) model, which eliminates the Inner-System Bias (ISB) between GPS and BDS, and it is conducive to the effective combination of GPS and BDS...
December 5, 2016: Sensors
https://www.readbyqxmd.com/read/27923979/functional-respiratory-imaging-regional-strain-and-expiratory-time-constants-at-three-levels-of-positive-end-expiratory-pressure-in-an-ex%C3%A2-vivo-pig-model
#9
William R Henderson, Yannick Molgat-Seon, Wim Vos, Rachel Lipson, Francisca Ferreira, Miranda Kirby, Cedric Van Holsbeke, Paolo B Dominelli, Donald E G Griesdale, Mypinder Sekhon, Harvey O Coxson, John Mayo, A William Sheel
Heterogeneity in regional end expiratory lung volume (EELV) may lead to variations in regional strain (ε). High ε levels have been associated with ventilator-associated lung injury (VALI). While both whole lung and regional EELV may be affected by changes in positive end-expiratory pressure (PEEP), regional variations are not revealed by conventional respiratory system measurements. Differential rates of deflation of adjacent lung units due to regional variation in expiratory time constants (τE) may create localized regions of ε that are significantly greater than implied by whole lung measures...
December 2016: Physiological Reports
https://www.readbyqxmd.com/read/27920775/human-papillomavirus-downregulates-the-expression-of-ifitm1-and-ripk3-to-escape-from-ifn%C3%AE-and-tnf%C3%AE-mediated-antiproliferative-effects-and-necroptosis
#10
Wenbo Ma, Bart Tummers, Edith M G van Esch, Renske Goedemans, Cornelis J M Melief, Craig Meyers, Judith M Boer, Sjoerd H van der Burg
The clearance of a high-risk human papillomavirus (hrHPV) infection takes time and requires the local presence of a strong type 1 cytokine T cell response, suggesting that hrHPV has evolved mechanisms to resist this immune attack. Using an unique system for non, newly, and persistent hrHPV infection, we show that hrHPV infection renders keratinocytes (KCs) resistant to the antiproliferative- and necroptosis-inducing effects of IFNγ and TNFα. HrHPV-impaired necroptosis was associated with the upregulation of several methyltransferases, including EZH2, and the downregulation of RIPK3 expression...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27919235/geographical-distribution-of-typhoid-risk-factors-in-low-and-middle-income-countries
#11
Jung-Seok Lee, Vijayalaxmi V Mogasale, Vittal Mogasale, Kangsung Lee
BACKGROUND: While the global burden of typhoid fever has been often brought up for attention, the detailed surveillance information has only been available for the limited number of countries. As more efficacious vaccines will be available in the near future, it is essential to understand the geographically diverse patterns of typhoid risk levels and to prioritize the right populations for vaccination to effectively control the disease. METHODS: A composite index called the typhoid risk factor (TRF) index was created based on data with the Global Positioning System (GPS)...
December 5, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27918679/movement-patterns-and-metabolic-responses-during-an-international-rugby-sevens-tournament
#12
Anthony Couderc, Claire Thomas, Mathieu Lacome, Julien Piscione, Julien Robineau, Rémi Delfour-Peyrethon, Rachel Borne, Christine Hanon
PURPOSE: This study investigated the running-demands and associated metabolic perturbations during an official rugby sevens tournament. METHODS: Twelve elite players participated in seven matches wearing Global Positioning System units. Maximal sprinting speed (MSS) and maximal aerobic speed (MAS) were measured. High-intensity threshold was individualized relative to MAS (>100% of MAS) and very high-intensity distance were reported relative to both MAS and MSS...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918454/coordinate-based-clustering-method-for-indoor-fingerprinting-localization-in-dense-cluttered-environments
#13
Wen Liu, Xiao Fu, Zhongliang Deng
Indoor positioning technologies has boomed recently because of the growing commercial interest in indoor location-based service (ILBS). Due to the absence of satellite signal in Global Navigation Satellite System (GNSS), various technologies have been proposed for indoor applications. Among them, Wi-Fi fingerprinting has been attracting much interest from researchers because of its pervasive deployment, flexibility and robustness to dense cluttered indoor environments. One challenge, however, is the deployment of Access Points (AP), which would bring a significant influence on the system positioning accuracy...
December 2, 2016: Sensors
https://www.readbyqxmd.com/read/27917927/robust-increase-in-extreme-summer-rainfall-intensity-during-the-past-four-decades-observed-in-china
#14
Chan Xiao, Peili Wu, Lixia Zhang, Lianchun Song
Global warming increases the moisture holding capacity of the atmosphere and consequently the potential risks of extreme rainfall. Here we show that maximum hourly summer rainfall intensity has increased by about 11.2% on average, using continuous hourly gauge records for 1971-2013 from 721 weather stations in China. The corresponding event accumulated precipitation has on average increased by more than 10% aided by a small positive trend in events duration. Linear regression of the 95(th) percentile daily precipitation intensity with daily mean surface air temperature shows a negative scaling of -9...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27917328/gps-imaging-of-vertical-land-motion-in-california-and-nevada-implications-for-sierra-nevada-uplift
#15
William C Hammond, Geoffrey Blewitt, Corné Kreemer
We introduce Global Positioning System (GPS) Imaging, a new technique for robust estimation of the vertical velocity field of the Earth's surface, and apply it to the Sierra Nevada Mountain range in the western United States. Starting with vertical position time series from Global Positioning System (GPS) stations, we first estimate vertical velocities using the MIDAS robust trend estimator, which is insensitive to undocumented steps, outliers, seasonality, and heteroscedasticity. Using the Delaunay triangulation of station locations, we then apply a weighted median spatial filter to remove velocity outliers and enhance signals common to multiple stations...
October 2016: Journal of Geophysical Research. Solid Earth
https://www.readbyqxmd.com/read/27916922/a-context-recognition-aided-pdr-localization-method-based-on-the-hidden-markov-model
#16
Yi Lu, Dongyan Wei, Qifeng Lai, Wen Li, Hong Yuan
Indoor positioning has recently become an important field of interest because global navigation satellite systems (GNSS) are usually unavailable in indoor environments. Pedestrian dead reckoning (PDR) is a promising localization technique for indoor environments since it can be implemented on widely used smartphones equipped with low cost inertial sensors. However, the PDR localization severely suffers from the accumulation of positioning errors, and other external calibration sources should be used. In this paper, a context-recognition-aided PDR localization model is proposed to calibrate PDR...
November 30, 2016: Sensors
https://www.readbyqxmd.com/read/27916827/localization-based-on-magnetic-markers-for-an-all-wheel-steering-vehicle
#17
Yeun Sub Byun, Young Chol Kim
Real-time continuous localization is a key technology in the development of intelligent transportation systems. In these systems, it is very important to have accurate information about the position and heading angle of the vehicle at all times. The most widely implemented methods for positioning are the global positioning system (GPS), vision-based system, and magnetic marker system. Among these methods, the magnetic marker system is less vulnerable to indoor and outdoor environment conditions; moreover, it requires minimal maintenance expenses...
November 29, 2016: Sensors
https://www.readbyqxmd.com/read/27912856/processes-of-developing-community-livability-in-older-age
#18
Kendra S Heatwole Shank, Malcolm P Cutchin
OBJECTIVE: 'Community livability' is a widely used term that is still under-conceptualized. The purpose of the project was to theorize key dynamics of livability for older adults who are aging in place in their homes and communities. METHODS: Twelve community-dwelling adults (70+) were recruited in a multiple-case study design. Interviews and naturalistic observations were used over the course of 6months. Global positioning system (GPS) devices were used to generate maps (routines, routes, type and duration of activities) to elicit additional insights through interviews...
December 2016: Journal of Aging Studies
https://www.readbyqxmd.com/read/27912766/non-random-distribution-of-child-undernutrition-in-ethiopia-spatial-analysis-from-the-2011-ethiopia-demographic-and-health-survey
#19
Zewdie Aderaw Alemu, Ahmed Ali Ahmed, Alemayehu Worku Yalew, Belay Simanie Birhanu
BACKGROUND: Child undernutrition showed geographical inequalities due to variations in contextual determinants from area to area which indicates that location is an important factor in child undernutrition. However, there are limited studies on spatial epidemiology of child undernutrition in Ethiopia. This study was aimed to identify the SaTScan spatial clusters of child undernutrition in Ethiopia. METHODS: Nutritional indices of children (0-59 months) with Global Positioning System (GPS) location data were accessed from the 2011 Ethiopia Demographic and Health Survey (EDHS) after getting permission from the MEASURES Demographic and Health Survey (DHS) Program...
December 3, 2016: International Journal for Equity in Health
https://www.readbyqxmd.com/read/27912763/global-health-partnership-for-student-peer-to-peer-psychiatry-e-learning-lessons-learned
#20
REVIEW
Roxanne C Keynejad
BACKGROUND: Global 'twinning' relationships between healthcare organizations and institutions in low and high-resource settings have created growing opportunities for e-health partnerships which capitalize upon expanding information technology resources worldwide. E-learning approaches to medical education are increasingly popular but remain under-investigated, whilst a new emphasis on global health teaching has coincided with university budget cuts in many high income countries. RESULTS: King's Somaliland Partnership (KSP) is a paired institutional partnership health link, supported by Tropical Health and Education Trust (THET), which works to strengthen the healthcare system and improve access to care through mutual exchange of skills, knowledge and experience between Somaliland and King's Health Partners, UK...
December 3, 2016: Globalization and Health
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