bluuebunny/crossref_metadata_2025_split huggingface dataset:
Prevalence of excessive screen time and associated factors in a school from a city in the northeast of brazil
Authors: Munaro Hector Luiz Rodrigues , Silva Diego Augusto Santos , Lopes Adair Da Silva 
Published: November 2016

Introduction: Studies about screen time and its correlates are generally determined by the sum of the duration of several behaviours. Studies that analysed behaviours separately highlighted different correlates. Objective: Estimate the prevalence of excessive screen time, through watching television and using computers or video games, and its correlates, in students in a city in North-eastern Brazil. Methods: An investigation in a high school located in the city of Jequie, Bahia state, Brazil, with a sample of 1163 students between 14 and 20 years. The dependent variables were excessive time watching television and using computers or video games, and the independent ones were socio-demographic and lifestyle variables. The magnitude of the association was determined by the Odds Ratio (OR) and by 95% of con fi dence intervals (CI). Results: The prevalence of excessive time watching television was estimated at 32.8% (95% CI: 29.9% - 35.5%) and using computer/videogames was 27.3% (95%CI: 24.5% - 29.5%). Those who did not work (OR = 1.940; 95%CI: 1.365 - 2.758); those students whose mothers had less than eight years of schooling (OR = 1.324; 95%CI: 1.023 - 1.714); and who did not regularly eat vegetables (OR = 1.423; 95%CI: 1.082-1.871) were more likely to be exposed to excessive television. On the other hand, those who had not reached the minimum consumption of fruits (OR = 0.712; 95% CI: 0.245 - 0.929) showed lower odds. Female students (OR = 0.694; 95%CI: 0.528 - 0.912) and students with family income lower than two minimum wages (OR = 0.630; 95%CI: 0.474 - 0.838) had lower chances of exposure to excessive time using computer/video games, while the insufficiently active (OR = 0.631; 95% CI: 0.438 - 0.911) showed higher chances. Conclusions: About 1/3 of the students spent too much time in front of the television and computer/video games, with a different correlation relative to each of these behaviours.
Association Between WIC Enrollment and Exclusive Breastfeeding at 3 Months Postpartum Among Low-Income Mothers
Authors: Francescon John , Haile Zelalem T. , Kling David , Chertok Ilana 
Published: November 2016

Abstract

Context: Existing literature suggests participation in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) in the prenatal and postnatal periods is associated with lower rates of breastfeeding among WIC-eligible mothers. However, minimal research has been published on the association between WIC enrollment and exclusive breastfeeding.

Objective: To examine the association between WIC exposure and exclusive breastfeeding at 3 months postpartum.

Methods: We conducted a secondary data analysis using information on 784 low-income women who participated in the longitudinal population-based Infant Feeding Practices Study II between May 2005 and June 2007. The main outcome of interest was exclusive breastfeeding at 3 months postpartum. Logistic regression analysis was used to estimate OR and 95% CI for exclusive breastfeeding relative to WIC enrollment status, controlling for the confounding effects of other maternal characteristics. We further conducted a subgroup analysis among those participating in WIC prenatally to examine the association between receipt of information about infant feeding from WIC and exclusive breastfeeding at 3 months postpartum.

Results: The crude prevalence of exclusive breastfeeding at 3 months postpartum was 18.1% of women enrolled in WIC and 41.1% of WIC-eligible nonparticipants (P<.0001). After adjusting for sociodemographic, behavioral, and anthropometric factors, the odds of exclusive breastfeeding at 3 months were lower for women enrolled in WIC (OR, 0.57; 95% CI, 0.37-0.88) when compared with women not enrolled in WIC. In the subgroup analysis, receipt of information from WIC about feeding infants during the prenatal period was not significantly associated with exclusive breastfeeding at 3 months (OR, 0.86; 95% CI, 0.39-1.89).

Conclusion: Women who were enrolled in WIC and who received information about feeding infants were less likely to exclusively breastfeed than women not in WIC. Continued improvement and adjustment to the existing WIC breastfeeding program could potentially improve these rates. Additional studies that examine the quality of WIC services provided, especially those pertaining to breastfeeding programs, are warranted.
Alternative Scheduling Models: Improving Continuity of Care, Medical Outcomes, and Graduate Medical Education in Resident Ambulatory Training
Authors: Hussain Ali J. 
Published: November 2016

Abstract
An association has been consistently made about continuity of care with improved quality of care and improved medical outcomes. However, resident ambulatory block scheduling prevents the optimization of continuity of care in ambulatory clinical education. The author performed a PubMed search for studies examining continuity of care and curriculum scheduling in US primary care residency clinics. These studies indicate the success of an X + Y scheduling model in resident ambulatory training. Additional benefits have also been noted, including improved clinical teaching and learning, increased sense of teamwork, increased resident satisfaction, improved recruitment and retention, improved patient satisfaction, and elimination of year-end patient care issues after graduation. Many allopathic institutions have begun to implement such curricular changes with demonstrated success. The author argues that osteopathic graduate medical education should embrace the X + Y scheduling model.
Dominance of grain size impacts on seasonal snow albedo at open sites in New Hampshire
Authors: Adolph Alden C. , Albert Mary R. , Lazarcik James , Dibb Jack E. , Amante Jacqueline M. , Price Andrea 
Published: November 2016

AbstractSnow cover serves as a major control on the surface energy budget in temperate regions due to its high reflectivity compared to underlying surfaces. Winter in the northeastern United States has changed over the last several decades, resulting in shallower snowpacks, fewer days of snow cover, and increasing precipitation falling as rain in the winter. As these climatic changes occur, it is imperative that we understand current controls on the evolution of seasonal snow albedo in the region. Over three winter seasons between 2013 and 2015, snow characterization measurements were made at three open sites across New Hampshire. These near‐daily measurements include spectral albedo, snow optical grain size determined through contact spectroscopy, snow depth, snow density, black carbon content, local meteorological parameters, and analysis of storm trajectories using the Hybrid Single‐Particle Lagrangian Integrated Trajectory model. Using analysis of variance, we determine that land‐based winter storms result in marginally higher albedo than coastal storms or storms from the Atlantic Ocean. Through multiple regression analysis, we determine that snow grain size is significantly more important in albedo reduction than black carbon content or snow density. And finally, we present a parameterization of albedo based on days since snowfall and temperature that accounts for 52% of variance in albedo over all three sites and years. Our improved understanding of current controls on snow albedo in the region will allow for better assessment of potential response of seasonal snow albedo and snow cover to changing climate.
Torrential rainfall responses of Typhoon Fitow (2013) to radiative processes: A three‐dimensional WRF modeling study
Authors: Xu Huiyan , Liu Rui , Zhai Guoqing , Li Xiaofan 
Published: November 2016

AbstractThe three‐dimensional Weather Research and Forecasting (WRF) model is used to conduct sensitivity experiments of Typhoon Fitow in 2013 during its landfall. Surface rainfall and heat budgets as well as the vertical profiles of stability and vertical velocity are analyzed to examine physical processes responsible for radiative effects on rainfall. The inclusion of radiative effects of liquid clouds suppresses radiative cooling in liquid cloud layers via reducing outgoing radiation to ice cloud layers, whereas it enhances radiative cooling in ice cloud layers through trapping less radiation from liquid cloud layers. The enhanced radiative cooling decreases from ice cloud layers to liquid cloud layers. The suppressed stability and vertical mass convergence increase. Thus, heat divergence is weakened to warm the atmosphere, which reduces net condensation and rainfall. The inclusion of radiative effects of ice clouds suppressed radiative cooling by reducing outgoing radiation. The suppressed radiative cooling reduces from ice cloud layers to liquid cloud layers, and the suppressed instability and vertical mass convergence decrease when radiative effects of liquid clouds are present. As a result, heat divergence is strengthened to cool the atmosphere, which increases net condensation and rainfall. The suppressed radiative cooling increases temperature and reduces net condensation and rainfall when radiative effects of liquid clouds are absent.
Dynamical downscaling simulation and future projection of summer rainfall in Taiwan: Contributions from different types of rain events
Authors: Huang Wan‐Ru , Chang Ya‐Hui , Hsu Huang‐Hsiung , Cheng Chao‐Tzuen , Tu Chia‐Ying 
Published: November 2016

AbstractSummer rainfall in Taiwan is composed of four types of rain events: tropical cyclone (TC), frontal convection (FC), diurnal convection (DC), and other southerly convection (SC) that propagates from the nearby ocean. In this study, we accessed the present‐day simulation (1979–2003) and future projection (2075–2099, the Representative Concentration Pathway 8.5 scenario) of rainfall in Taiwan by using the regional Weather Research and Forecasting model driven by the global High Resolution Atmospheric Model. The results indicated that the dynamical downscaling process adds value to the present‐day simulation of summer rainfall in Taiwan and the contribution of different types of rain events. It was found that summer rainfall in Taiwan will increase in a warmer future and that this change was mainly due to an increase in SC rainfall (i.e., light rainfall event). The following trends in Taiwan rainfall were also predicted in a warmer future: (1) SC rainy days will increase because the intensified monsoonal flow facilitates the propagation of more SC toward Taiwan, (2) TC rainy days will decrease as the Western North Pacific subtropical high extends southwestward and prevents TC systems from passing over Taiwan, (3) DC rainy days will decrease in response to the increased local thermal stability, and (4) FC rainy days will show no significant changes. Moreover, all types of rainfall are projected to become more intense in the future due to the increased moisture supply in a warmer climate. These findings highlight how the rainfall characteristics in East Asia may change in response to climate change.
Measurements of δ13C in CH4 and using particle dispersion modeling to characterize sources of Arctic methane within an air mass
Authors: France J. L. , Cain M. , Fisher R. E. , Lowry D. , Allen G. , O'Shea S. J. , Illingworth S. , Pyle J. , Warwick N. , Jones B. T. , Gallagher M. W. , Bower K. , Le Breton M. , Percival C. , Muller J. , Welpott A. , Bauguitte S. , George C. , Hayman G. D. , Manning A. J. , Myhre C. Lund , Lanoisellé M. , Nisbet E. G. 
Published: November 2016

AbstractA stratified air mass enriched in methane (CH4) was sampled at ~600 m to ~2000 m altitude, between the north coast of Norway and Svalbard as part of the Methane in the Arctic: Measurements and Modelling campaign on board the UK's BAe‐146‐301 Atmospheric Research Aircraft. The approach used here, which combines interpretation of multiple tracers with transport modeling, enables better understanding of the emission sources that contribute to the background mixing ratios of CH4 in the Arctic. Importantly, it allows constraints to be placed on the location and isotopic bulk signature of the emission source(s). Measurements of δ13C in CH4 in whole air samples taken while traversing the air mass identified that the source(s) had a strongly depleted bulk δ13C CH4 isotopic signature of −70 (±2.1)‰. Combined Numerical Atmospheric‐dispersion Modeling Environment and inventory analysis indicates that the air mass was recently in the planetary boundary layer over northwest Russia and the Barents Sea, with the likely dominant source of methane being from wetlands in that region.
Improving the accuracy of the gradient method for determining soil carbon dioxide efflux
Authors: Sánchez‐Cañete Enrique P. , Scott Russell L. , van Haren Joost , Barron‐Gafford Greg A. 
Published: November 2016

AbstractSoil CO2 efflux (Fsoil) represents a significant source of ecosystem CO2 emissions that is rarely quantified with high‐temporal‐resolution data in carbon flux studies. Fsoil estimates can be obtained by the low‐cost gradient method (GM), but the utility of the method is hindered by uncertainties in the application of published models for the diffusion coefficient. Therefore, to address and resolve these uncertainties, we compared Fsoil measured by 2 soil CO2 efflux chambers and Fsoil estimated by 16 gas transport models using the GM across 1 year. We used 14 published empirical gas diffusion models and 2 in situ models: (1) a gas transfer model called “Chamber model” obtained using a calibration between the chamber and the gradient method and (2) a diffusion model called “SF6 model” obtained through an interwell conservative tracer experiment. Most of the published models using the GM underestimated cumulative annual Fsoil by 55% to 361%, while the Chamber model closely approximated cumulative Fsoil (0.6% error). Surprisingly, the SF6 model combined with the GM underestimated Fsoil by 32%. Differences between in situ models could stem from the Chamber model implicitly accounting for production of soil CO2, while the conservative tracer model does not. Therefore, we recommend using the GM only after calibration with chamber measurements to generate reliable long‐term ecosystem Fsoil measurements. Accurate estimates of Fsoil will improve our understanding of soil respiration's contribution to ecosystem fluxes.
More Evidence for Three Types of Cognitive Style: Validating the Object‐Spatial Imagery and Verbal Questionnaire Using Eye Tracking when Learning with Texts and Pictures
Authors: Höffler Tim N. , Koć‐Januchta Marta , Leutner Detlev 
Published: November 2016

SummaryThere is some indication that people differ regarding their visual and verbal cognitive style. The Object‐Spatial Imagery and Verbal Questionnaire (OSIVQ) assumes a three‐dimensional cognitive style model, which distinguishes between object imagery, spatial imagery and verbal dimensions. Using eye tracking as a means to observe actual gaze behaviours when learning with text–picture combinations, the current study aims to validate this three‐dimensional assumption by linking the OSIVQ to learning behaviour. The results largely confirm the model in that they show the expected correlations between results on the OSIVQ, visuo‐spatial ability and learning behaviour. Distinct differences between object visualizers, spatial visualizers and verbalizers could be demonstrated.© 2016 The Authors Applied Cognitive Psychology Published by John Wiley & Sons Ltd.
Sociodemographic correlates and family aggregation of leukocyte telomere length in adults and children from Mesoamerica
Authors: Flannagan Kerry S. , Jansen Erica C. , Rozek Laura S. , Rentschler Katie M. , Roman Ana Victoria , Ramirez‐Zea Manuel , Villamor Eduardo ,   For the Nine Mesoamerican Countries Metabolic Syndrome Study (NiMeCoMeS) Group
Published: November 2016

AbstractObjectiveTelomere length is a biomarker of cumulative stress and inflammation related to chronic disease risk. We examined the associations of leukocyte telomere length (LTL) with sociodemographic and anthropometric variables and estimated LTL family aggregation in Central America, a region with a high burden of chronic disease where LTL has not been studied.MethodsWe conducted a cross‐sectional study of 174 school age children and their parents in the capital cities of Belize, Honduras, Nicaragua, Costa Rica, Panama, and the city of Tuxtla‐Gutierrez in Mexico. We measured LTL by quantitative PCR in DNA extracted from whole blood. We compared the distribution of LTL by categories of sociodemographic and anthropometric characteristics using linear regression. Family aggregation was estimated with correlation coefficients and intraclass correlations.ResultsIn mothers, LTL was inversely associated with age (P, trend < .0001) and positively associated with height (P = .0002). Among fathers, LTL was inversely associated with food insecurity (P, trend = .0004). In children, boys had 0.10 log units shorter LTL than girls (95% CI: −0.17, −0.03; P = .004). LTL was inversely associated with parental education (P, trend = .01) and positively associated with paternal age at birth (P, trend < .0001), maternal LTL (P, trend = .007), and paternal LTL (P, trend = .02). LTL varied significantly by country of origin among all family members. Aggregation was greatest between children and their mothers, and mostly occurred at the country, rather than family, level.ConclusionLTL is associated with age and height in women; food insecurity in men; and sex, parental education, parental LTL, and paternal age at birth among children.
Chimpanzee uses manipulative gaze cues to conceal and reveal information to foraging competitor
Authors: Hall Katie , Oram Mike W. , Campbell Matthew W. , Eppley Timothy M. , Byrne Richard W. , de Waal Frans B.M. 
Published: November 2016

Tactical deception has been widely reported in primates on a functional basis, but details of behavioral mechanisms are usually unspecified. We tested a pair of chimpanzees (Pan troglodytes) in the informed forager paradigm, in which the subordinate saw the location of hidden food and the dominant did not. We employed cross‐correlations to examine temporal contingencies between chimpanzees’ behavior: specifically how the direction of the subordinate's gaze and movement functioned to manipulate the dominant's searching behavior through two tactics, withholding, and misleading information. In Experiment 1, not only did the informed subordinate tend to stop walking toward a single high value food, but she also refrained from gazing toward it, thus, withholding potentially revealing cues from her searching competitor. In a second experiment, in which a moderate value food was hidden in addition to the high value food, whenever the subordinate alternated her gaze between the dominant and the moderate value food, she often paused walking for 5 s; this frequently recruited the dominant to the inferior food, functioning as a “decoy.” The subordinate flexibly concealed and revealed gaze toward a goal, which suggests that not only can chimpanzees use visual cues to make predictions about behavior, but also that chimpanzees may understand that other individuals can exploit their gaze direction. These results substantiate descriptive reports of how chimpanzees use gaze to manipulate others, and to our knowledge are the first quantitative data to identify behavioral mechanisms of tactical deception.RESEARCH HIGHLIGHTSCross correlations show a subordinate chimpanzee tactically deceived a dominant by not gazing toward a valuable food (withholding), and recruiting to a “decoy” food (misleading). Chimpanzees understand that others can exploit their gaze direction.
Iridium‐Catalyzed Stereoselective Allylic Alkylation Reactions with Crotyl Chloride
Authors: Hethcox J. Caleb , Shockley Samantha E. , Stoltz Brian M. 
Published: November 2016

AbstractThe development of the first enantio‐, diastereo‐, and regioselective iridium‐catalyzed allylic alkylation reaction of prochiral enolates to form an all‐carbon quaternary stereogenic center with an aliphatic‐substituted allylic electrophile is disclosed. The reaction proceeds with good to excellent selectivity with a range of substituted tetralone‐derived nucleophiles furnishing products bearing a newly formed vicinal tertiary and all‐carbon quaternary stereodyad. The utility of this protocol is further demonstrated via a number of synthetically diverse product transformations.
Fabrication of starch‐g‐poly(l‐lactic acid) biocomposite films: Effects of the shear‐mixing and reactive‐extrusion conditions
Authors: Salimi Kouroush , Şen Selin Cansu , Ersan Hülya Yavuz , Pişkin Erhan 
Published: November 2016

ABSTRACTIn this study, we developed a new approach for the fabrication of a green poly(l‐lactic acid)‐grafted starch (St‐g‐PLA) copolymer and nanocomposite (St‐g‐PLA/organoclay)‐based films via shear‐mixing and reactive‐extrusion systems. The chemical and physical structures, thermal behavior, and morphology of the synthesized blends and some other parameters were examined by Fourier transform infrared spectroscopy and 13C cross‐polarization/magic angle spinning NMR spectroscopy, X‐ray diffraction, thermogravimetric analysis–derivative thermogravimetry, and scanning electron microscopy, respectively. Significant increases in the mechanical and permeability properties were evident in the high value of grafted poly(lactic acid) molar percentages and high exfoliation of organoclay. The biodegradability of films were investigated under aerobic composting conditions through the measurement of the temperature, moisture, pH, consumed O2 value, and carbon dioxide produced. This new strategy mainly improved the good adhesion between both phases, and it was an interesting method for the production of environmentally friendly biocomposites that could easily be scaled up for commercial production with the potential for replacing petroleum‐based plastics. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44490.
Parameter Identification and Adaptive Control Of Carbon Nanotube Resonators
Authors: Jamshidifar Hamed , Askari Hassan , Fidan Baris 
Published: November 2016

AbstractIn this paper, we exploit an adaptive control scheme to adjust highly sensitive oscillations of fluid conveying carbon nanotube (CNT) resonators. Firstly, we focus on the nonlinear vibrations of the fluid conveying CNTs, considering an added mass using nonlocal Euler‐Bernoulli beam theory. CNT rests on nonlinear Winkler and Pasternak foundations. We use the Galerkin method to extract the nonlinear ordinary differential equation models of the CNT oscillations. We elicit a linear parametric model for estimating the added mass and other parameters of the system. Numerical simulations delineate that the developed model has sensitivity to added mass at the yoctogram level. It is known that CNT vibrations are very sensitive to small perturbations. Accordingly, a small perturbation results in significantly abrupt changes in the vibrational parameters of the targeted system. For that reason, it is crucial to have a potent apparatus for identifying the system parameters in case of sudden changes in the vibrational parameters. For such parameter identification, a least squares (LS) parameter identification algorithm and an extended Luenberger observer are integrated to a pole placement controller for online estimation of the system parameters as well as vibration control of the objective system. It is well‐known that CNTs are potentially ideal atomic force microscopy (AFM) probes, and accordingly, the proposed method is potentially beneficial for identifying highly sensitive motions in AFM. In addition, numerical simulations are presented, showing that the proposed adaptive controller has the potential to be used for vibration control of the CNT resonators even in the case of chaotic motions.