bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ultrasound for Lower Extremity Deep Venous Thrombosis
Authors: Needleman Laurence , Cronan John J. , Lilly Michael P. , Merli Geno J. , Adhikari Srikar , Hertzberg Barbara S. , DeJong M. Robert , Streiff Michael B. , Meissner Mark H. 
Published: April 2018

Venous ultrasound is the standard imaging test for patients suspected of having acute deep venous thrombosis (DVT). There is variability and disagreement among authoritative groups regarding the necessary components of the test. Some protocols include scanning the entire lower extremity, whereas others recommend scans limited to the thigh and knee supplemented with serial testing. Some protocols use gray-scale ultrasound alone, whereas others include Doppler interrogation. Point-of-care ultrasound is recommended in some settings, and there is heterogeneity of these protocols as well. Heterogeneity of recommendations can lead to errors including incorrect application of guidelines, confusion among requesting physicians, and incorrect follow-up. In October 2016, the Society of Radiologists in Ultrasound convened a multidisciplinary panel of experts to evaluate the current evidence to develop recommendations regarding ultrasound protocols for DVT and the terminology used to communicate results to clinicians. Recommendations were made after open discussion and by unanimous consensus.
The panel recommends a comprehensive duplex ultrasound protocol from thigh to ankle with Doppler at selected sites rather than a limited or complete compression-only examination. This protocol is currently performed in many facilities and is achievable with standard ultrasound equipment and personnel. The use of these recommendations will increase the diagnosis of calf DVT and provide better data to explain the presenting symptoms. The panel recommends a single point-of-care protocol that minimizes underdiagnoses of proximal DVT.
The panel recommends the term chronic postthrombotic change to describe the residual material that persists after the acute presentation of DVT to avoid potential overtreatment of prior thrombus.
Adoption of a single standardized comprehensive duplex ultrasound and a single point-of-care examination will enhance patient safety and clinicians’ confidence.
Volume of Light Versus Moderate‐to‐Vigorous Physical Activity: Similar Benefits for All‐Cause Mortality?
Authors: Saint‐Maurice Pedro F. , Troiano Richard P. , Berrigan David , Kraus William E. , Matthews Charles E. 
Published: April 2018

Background

It is unclear whether the greater benefits of moderate‐to‐vigorous physical activity (
PA
) over light
PA
are attributed to the higher‐intensity
PA
or simply the greater volume of
PA
accumulated per unit time for moderate‐to‐vigorous
PA
. We examined this question using estimates of the
volume
of light and moderate‐to‐vigorous
PA
in relation to all‐cause mortality.

Methods and Results

We used National Health and Nutrition Examination Survey 2003–2006 accelerometer records in adults (≥40 years; n=4840) and mortality data collected through 2011 (n=700 deaths). We estimated intensity‐specific
PA
volume using activity counts (
AC
) accumulated in light (100–759 AC/min), moderate‐to‐vigorous
PA
(≥760 AC/min), and total
PA
(≥100 AC/min). We examined quartiles of each exposure using Cox proportional hazard models (hazard ratios [95% confidence interval) adjusted for demographic and behavioral risk factors, health status, and body mass index. Mortality risk was less across increasing quartiles of light
PA
volume (
AC
×1000) when compared with the least quartile (
AC
≤61.8); the least risk occurred in the upper quartile of light
PA
,
AC
>98.5 (hazard ratios=0.69, 95% confidence interval: 0.47, 1.00,
P
trend ≤0.05). The benefits for mortality risk were greater across quartiles of moderate‐to‐vigorous
PA
and reached a hazard ratio of 0.28 (95% confidence interval: 0.17, 0.46,
P
trend ≤0.05) for
AC
>187.9, when compared with the referent group (
AC
≤50.8). Results examining various combinations of light and moderate‐to‐vigorous intensity‐specific volumes demonstrated the strong influence of total activity on mortality risk.

Conclusions

In this population, increasing light
PA
was associated with less mortality, but at an approximately equal volume of
PA
, moderate‐to‐vigorous
PA
appeared to have greater benefits.
The North Atlantic Waveguide and Downstream Impact Experiment
Authors: Schäfler Andreas , Craig George , Wernli Heini , Arbogast Philippe , Doyle James D. , McTaggart-Cowan Ron , Methven John , Rivière Gwendal , Ament Felix , Boettcher Maxi , Bramberger Martina , Cazenave Quitterie , Cotton Richard , Crewell Susanne , Delanoë Julien , Dörnbrack Andreas , Ehrlich André , Ewald Florian , Fix Andreas , Grams Christian M. , Gray Suzanne L. , Grob Hans , Groß Silke , Hagen Martin , Harvey Ben , Hirsch Lutz , Jacob Marek , Kölling Tobias , Konow Heike , Lemmerz Christian , Lux Oliver , Magnusson Linus , Mayer Bernhard , Mech Mario , Moore Richard , Pelon Jacques , Quinting Julian , Rahm Stephan , Rapp Markus , Rautenhaus Marc , Reitebuch Oliver , Reynolds Carolyn A. , Sodemann Harald , Spengler Thomas , Vaughan Geraint , Wendisch Manfred , Wirth Martin , Witschas Benjamin , Wolf Kevin , Zinner Tobias 
Published: April 2018

AbstractThe North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX) explored the impact of diabatic processes on disturbances of the jet stream and their influence on downstream high-impact weather through the deployment of four research aircraft, each with a sophisticated set of remote sensing and in situ instruments, and coordinated with a suite of ground-based measurements. A total of 49 research flights were performed, including, for the first time, coordinated flights of the four aircraft: the German High Altitude and Long Range Research Aircraft (HALO), the Deutsches Zentrum für Luft- und Raumfahrt (DLR) Dassault Falcon 20, the French Service des Avions Français Instrumentés pour la Recherche en Environnement (SAFIRE) Falcon 20, and the British Facility for Airborne Atmospheric Measurements (FAAM) BAe 146. The observation period from 17 September to 22 October 2016 with frequently occurring extratropical and tropical cyclones was ideal for investigating midlatitude weather over the North Atlantic. NAWDEX featured three sequences of upstream triggers of waveguide disturbances, as well as their dynamic interaction with the jet stream, subsequent development, and eventual downstream weather impact on Europe. Examples are presented to highlight the wealth of phenomena that were sampled, the comprehensive coverage, and the multifaceted nature of the measurements. This unique dataset forms the basis for future case studies and detailed evaluations of weather and climate predictions to improve our understanding of diabatic influences on Rossby waves and the downstream impacts of weather systems affecting Europe.
Provision of Climate Services for Agriculture: Public and Private Pathways to Farm Decision-Making
Authors: Haigh Tonya , Koundinya Vikram , Hart Chad , Klink Jenna , Lemos Maria , Mase Amber Saylor , Prokopy Linda , Singh Ajay , Todey Dennis , Widhalm Melissa 
Published: April 2018

AbstractThe pathways between climate information producers and agricultural decision-makers are evolving and becoming more complex, with information increasingly flowing through both public and for-profit intermediaries and organizations. This study characterizes the various channels of climate information flow, as well as the needs and preferences of information intermediaries and end users. We use data from a 2016 survey of farmers and agricultural advisors in 12 U.S. Corn Belt states to evaluate perceptions of climate information and its usability. Our findings reinforce the view that much weather and climate information is not reaching farmers explicitly but also suggest that farmers may not be aware of the extent to which the information is packaged with seed, input, or management recommendations. For farmers who are using weather and climate information, private services such as subscription and free tools and applications (apps) are as influential as publicly provided services. On the other hand, we find that agricultural advisors are engaged users and transformers of both public and private sources of weather/climate information and that they choose sources of information based on qualities of salience and credibility. Our results suggest that climate information providers could improve the use of information in agriculture by engaging advisors and farmers as key stakeholders and by strategically employing multiple delivery pathways through the private and public sectors.
An Observational Study of the Diurnal Variation of Precipitation over Hong Kong and the Underlying Processes
Authors: Li Xiuzhen , Lau Ngar-Cheung , Lee Tsz-Cheung 
Published: April 2018

AbstractHourly rainfall from automatic weather stations and reanalysis data from MERRA-2 are used to investigate the diurnal variation of precipitation in Hong Kong, a site along the southeast China coast with strong interactions between the monsoonal circulation and the land–sea breeze. The precipitation in Hong Kong is characterized by a spatially uniform diurnal cycle with the peak at about 0800 local time (LT), with rather weak dependence on local terrain. Precipitation unrelated to tropical cyclones (TCs) dominates the diurnal variation of precipitation, especially in the summer. The diurnal cycle exhibits a notable seasonal dependence, with the strongest signal in the summer. The morning peak of precipitation over Hong Kong is coincident with deep rising motion, linking to near-surface convergence and overlying weak divergence. The convergence may be attributed to the prevalence of the southerly monsoonal flow over the South China Sea (SCS) and to the northerly land breeze induced by the land–sea thermal contrast in the morning. The overlying weak divergence could be ascribed to the nocturnal–early morning acceleration of southerly flow over southeast China. Linked to the inverse relationship between monsoon intensity and the land–sea thermal contrast, the diurnal cycle of precipitation is strengthened when the SCS monsoon is active and weakened when the land–sea thermal contrast is high. Both the cloud-top radiative cooling effect and the enhanced radiative cooling over inland cloud-free areas also play roles in the development of the morning rainfall peak over Hong Kong.
A Simple Accurate Formula for Calculating Saturation Vapor Pressure of Water and Ice
Authors: Huang Jianhua 
Published: April 2018

AbstractIt is necessary to calculate the saturation vapor pressure of water and of ice for some purposes in many disciplines. A number of formulas are available for this calculation. These formulas either are tedious or are not very accurate. In this study, a new formula has been developed by integrating the Clausius–Clapeyron equation. This new formula is simple and easy to remember. In comparison with the International Association for the Properties of Water and Steam reference dataset, the mean relative errors from this new formula are only 0.001% and 0.006% for the saturation vapor pressure of water and of ice, respectively, within a wide range of temperatures from −100° to 100°C. In addition, this new formula yields a mean relative error of 0.0005% within the commonly occurring temperature range (10°–40°C). Therefore, this new formula has significant advantages over the improved Magnus formula and can be used to calculate the saturation vapor pressure of water and of ice in a wide variety of disciplines.
An Improved Algorithm for Low-Level Turbulence Forecasting
Authors: Muñoz-Esparza Domingo , Sharman Robert 
Published: April 2018

AbstractA low-level turbulence (LLT) forecasting algorithm is proposed and implemented within the Graphical Turbulence Guidance (GTG) turbulence forecasting system. The LLT algorithm provides predictions of energy dissipation rate (EDR; turbulence dissipation to the one-third power), which is the standard turbulence metric used by the aviation community. The algorithm is based upon the use of distinct log-Weibull and lognormal probability distributions in a statistical remapping technique to represent accurately the behavior of turbulence in the atmospheric boundary layer for daytime and nighttime conditions, respectively, thus accounting for atmospheric stability. A 1-yr-long GTG LLT calibration was performed using the High-Resolution Rapid Refresh operational model, and optimum GTG ensembles of turbulence indices for clear-air and mountain-wave turbulence that minimize the mean absolute percentage error (MAPE) were determined. Evaluation of the proposed algorithm with in situ EDR data from the Boulder Atmospheric Observatory tower covering a range of altitudes up to 300 m above the surface demonstrates a reduction in the error by a factor of approximately 2.0 (MAPE = 55%) relative to the current operational GTG system (version 3). In addition, the probability of detection of typical small and large EDR values at low levels is increased by approximately 15%–20%. The improved LLT algorithm is expected to benefit several nonconventional turbulence-prediction sectors such as unmanned aerial systems and wind energy.
The June–September Low Cloud Cover in Western Central Africa: Mean Spatial Distribution and Diurnal Evolution, and Associated Atmospheric Dynamics
Authors: Dommo A. , Philippon N. , Vondou Derbetini A. , Sèze G. , Eastman R. 
Published: April 2018

AbstractWestern central Africa (WCA) was recently shown to be one of the cloudiest areas of the tropics. Analyzing an ensemble of satellite products and surface cloud observations, we show that in June–September, WCA cloud cover is dominated by single-layered low stratiform clouds. Despite an underestimation of low cloud frequency in satellite estimates at night, comparisons with surface observations bring insights into the spatial distribution and diurnal cycle of low clouds. Both appear strongly influenced by orography: to the west, the coastal plains and the ocean-facing valleys have the largest cloud cover and a lower-amplitude diurnal cycle with a maximum cloud phase at 0400 local time (LT). To the east, across the windward slopes, plateaus, and downwind slopes, the cloud cover becomes progressively reduced and the diurnal cycle has a larger amplitude with a maximum cloud phase at 1000 LT. In terms of atmospheric dynamics, the east/west gradient observed in low cloud frequency and amount is related to a foehn effect without substantial rainfall on windward slopes. The diurnal cycle of low clouds on the windward slopes and plateaus is related to the reversal, from mean subsidence at 0700 LT over the Atlantic and inland to rising motion inland at 1300 LT. In addition, the airmass stability in low levels prevents the vertical development of cloud cover. Last, we could not detect in the European reanalyses any nocturnal jet as observed in southern West Africa (SWA), suggesting different mechanisms triggering low cloud formation in WCA compare to SWA.
Destabilization of an Oceanic Meddy-Like Vortex: Energy Transfers and Significance of Numerical Settings
Authors: Ménesguen C. , Le Gentil S. , Marchesiello P. , Ducousso N. 
Published: April 2018

Abstract The increase of computational capabilities led recent studies to implement very high-resolution simulations that gave access to new scale interaction processes, particularly those associated with the transfer of energy from the oceanic mesoscales to smaller scales through an interior route to dissipation, which is still underexplored. In this context, we study spindown simulations of a mesoscale interior vortex, unstable to a mixed baroclinic–barotropic instability. Even though the global energy is almost conserved, some energy is transferred down to dissipation scales during the development of instabilities. However, in our parameter regime, there is no substantial forward energy cascade sustained by unbalanced dynamics. Rather than exploring the physical parameter range, we clarify numerical discretization issues that can be detrimental to the physical solutions and our interpretation of finescale dynamics. Special care is given to determining the effective resolution of the different simulations. We improve it by a factor of 2 in our primitive equation (PE) finite-difference Coastal and Regional Ocean Community (CROCO) model by implementing a fifth-order accurate horizontal advection scheme. We also explore a range of grid aspect ratios dx/dz and find that energy spectra converge for aspect ratios that are close to N/f, the ratio of the stratification N over the Coriolis parameter f. However, convergence is not reached in the PE model when using a fourth-order centered scheme for vertical tracer advection (standard in ROMS-family codes). The scheme produces dispersion errors that trigger baroclinic instabilities and generate spurious submesoscale horizontal features. This spurious instability shows great impact on submesoscale production and energy cascade, emphasizing the significance of numerical settings in oceanic turbulence studies.
On the Importance of a Consistent Treatment of Prognostic Moisture Variables between Convective and Microphysical Parameterizations
Authors: Grell Evelyn D. , Bao Jian-Wen , Kingsmill David E. , Michelson Sara A. 
Published: April 2018

Abstract
Analysis of WRF Model output from experiments using two double-moment microphysics schemes is carried out to demonstrate that there can be an inconsistency between the predicted mass and number concentrations when a single-moment convective parameterization is used together with a double-moment microphysics scheme. This inconsistency may arise because the grid-scale and subgrid-scale cloud schemes generally apply different levels of complexity to the parameterized microphysical processes. In particular, when a multimoment formulation is used in the microphysics scheme and other physical parameterizations modify only the mass-related moment while the values of the second (or higher) moment for individual hydrometeors remain unchanged, an unintended modification of the particle size distribution occurs. Simulated radar reflectivity is shown to be a valuable tool in diagnosing this inconsistency. In addition, potential ways to minimize the problem are explored by including number concentration calculations in the cumulus parameterization that are consistent with the assumptions of hydrometeor sizes in the microphysics parameterization. The results of this study indicate that it is physically preferable to unify microphysical assumptions between the grid-resolved and subgrid cloud parameterization schemes in weather and climate simulation models.
Using participatory approaches with children to better understand their physical activity behaviour
Authors: Hayball Felicity ZL , Pawlowski Charlotte Skau 
Published: April 2018

Aims and objectives: The importance of childhood physical activity is widely recognised. Helping children to articulate their opinions is a crucial factor in improving their health and well-being, yet the field is predominantly focused on adult-led quantitative methods and lacks deeper understanding from a child perspective. Methods: This paper draws on experiences from a Danish study in which children depicted their physical activity behaviour in go-along group interviews in schoolyards ( n = 111), and a Scottish study in which children photographed or drew meaningful places and discussed physical activity in these places ( n = 25). Results: The benefits and challenges associated with using participatory methods to understand how children perceive the environment in relation to their physical activity behaviour are described. Conclusion: Findings contribute to the literature by suggesting that participatory approaches are valuable in capturing children’s perceptions of physical activity behaviour in outdoor environments.
A county extension-delivered, email-mediated walking intervention: A programme evaluation
Authors: Richards Elizabeth A , Woodcox Stephanie 
Published: April 2018

Objective: The promotion of walking could be a feasible population-level physical activity strategy because it requires little planning, is low cost and can be done year-round across settings. Community, nonprofit organisations offer one means by which to help increase walking through community programmes. The US Cooperative State Research, Education, and Extension Service has a history that spans more than a century and is known for quality in the delivery of educational programmes to help improve the lives of people in communities across the USA. The purpose of this study was to evaluate the effectiveness, feasibility and acceptability of the Get WalkIN’ intervention – an initiative supported by this programme – from the perspectives of both programme participants and county extension educators. Methods: Participants were recruited from 15 county extension sites in the Midwest region of the USA. Intervention emails targeted self-efficacy, social support, goal-setting and benefits/barriers to walking. To assess the perceptions of feasibility and acceptability of the intervention, participants and extension educators were asked to respond to a series of Likert-type scale and open-ended questions. Self-reported physical activity was assessed using the Godin Leisure-Time Physical Activity Questionnaire. Results: On average, participants and extension educators agreed that the programme was easy to use and would consider either recommending the programme to a friend or implementing the programme again within the community. Post-intervention, 69.1% of respondents were classified as sufficiently active compared to 60.5% pre-intervention. Conclusion: The use of the county-based US Cooperative State Research, Education, and Extension Service is an effective option for health promotion programming. Furthermore, a theory-based, email-mediated intervention is a valuable strategy as an independent and convenient way to facilitate increase in physical activity.
A nutritional intervention program improves the nutritional status of geriatric patients at nutritional risk—a randomized controlled trial
Authors: Terp Rikke , Jacobsen Kim Otto , Kannegaard Pia , Larsen Anne-Mette , Madsen Ole Rintek , Noiesen Eline 
Published: April 2018

Objectives: To investigate the effect of a nutrition intervention program for geriatric nutritional at-risk patients. Design: A randomized controlled trial. Setting: Department of geriatric medicine in a university hospital and in the primary healthcare sector, Copenhagen. Subjects: Geriatric patients ( N = 144) at nutritional risk. Intervention: The intervention consisted of an individual dietary plan for home, including pre-discharge advice on nutritional intake, combined with three follow-up visits after discharge (one, four, and eight weeks). Main measures: Change in body weight, Barthel Index, hand-grip strength and self-rated health from baseline (discharge) to three months after discharge, readmission, and mortality (90 and 120 days). Results: The mean (SD) age in total sample was 87.2 (6.2) years. Sample size in the intervention group (IG) was N = 72, and in the control group (CG), N = 72. IG had a mean (SD) weight gain of 0.9 (4.2) kg compared to a weight loss of 0.8 (3.6) kg in the CG ( P = 0.032). In addition, an improvement in self-rated health was seen in the IG compared to CG (IG: 23 (47%) vs. CG: 12 (24%); P = 0.021). No significant difference between groups was found in functional status, mortality, or readmission rates. Conclusion: An individual dietary plan based on everyday food, combined with three follow-up visits (one, four, and eight weeks) after discharge, led to an improvement in nutritional status and self-rated health in geriatric patients.