bluuebunny/crossref_metadata_2025_split huggingface dataset:
Supersymmeric Gauge Theory on Curved 7‐Branes
Authors: Prins Daniël 
Published: March 2019

AbstractWe construct novel 7d supersymmetric gauge theories which include a Chern‐Simons‐like term on curved spaces. In order to so, we examine the supersymmetry constraints for E7‐branes in type IIA* theory, rather than making use of an off‐shell supergravity. We find two classes of solutions to the constraints, expressed in terms of a G2‐structure with non‐vanishing intrinsic torsion. The supersymmetric gauge theories are then obtained by coupling flat gauge theory to such supersymmetric backgrounds. Various examples are given, including round and squashed S7 as well as with M4 hyperkähler.
Measuring the unmeasurable? A method to quantify adoption of integrated pest management practices in temperate arable farming systems
Authors: Creissen Henry E , Jones Philip J , Tranter Richard B , Girling Robbie D , Jess Stephen , Burnett Fiona J , Gaffney Michael , Thorne Fiona S , Kildea Steven 
Published: March 2019

AbstractBACKGROUNDThe impetus to adopt integrated pest management (IPM) practices has re‐emerged in the last decade, mainly as a result of legislative and environmental drivers. However, a significant deficit exists in the ability to practically monitor and measure IPM adoption across arable farms; therefore, the aim of the project reported here was to establish a universal metric for quantifying adoption of IPM in temperate arable farming. This was achieved by: (i) identifying a set of key activities that contribute to IPM; (ii) weighting these in terms of their importance to the achievement of IPM using panels of expert stakeholders to create the metric (scoring system from 0 to 100 indicating level of IPM practised); (iii) surveying arable farmers in the UK and Ireland about their pest management practices; and (iv) measuring level of farmer adoption of IPM using the new metric.RESULTSThis new metric was found to be based on a consistent conception of IPM between countries and professional groups. The survey results showed that, although level of adoption of IPM practices varied over the sample, all farmers had adopted IPM to some extent (minimum 27.2 points, mean score of 65.1), but only 13 of 225 farmers (5.8%) had adopted more than 85% of what is theoretically possible, as measured by the new metric.CONCLUSIONWe believe that this new metric would be a viable and cost‐effective system to facilitate the benchmarking and monitoring of national IPM programmes in temperate zone countries with large‐scale arable farming systems. © 2019 Society of Chemical Industry
Event‐triggered practical finite‐time output feedback stabilization of a class of uncertain nonlinear systems
Authors: Zhang Cui‐Hua , Yang Guang‐Hong 
Published: March 2019

SummaryThis paper studies the event‐triggered practical finite‐time output feedback stabilization problem for a class of uncertain nonlinear systems with unknown control gains. First, a reduced‐dimensional observer is employed to implement the reconstruction of the unavailable states. Furthermore, a novel event‐triggered output feedback control strategy is proposed based on the idea of backstepping design and sign function techniques. It is shown that the practical finite‐time stability of the closed‐loop systems is ensured by Lyapunov analysis and related stability criterion. Compared with the existing methods, the main advantage of this strategy is that the observer errors and event‐trigger errors can be processed simultaneously to achieve the practical finite‐time stability. Finally, an example is adopted to demonstrate the validity of the proposed scheme.
Molecular Engineering of an Organic NIR‐II Fluorophore with Aggregation‐Induced Emission Characteristics for In Vivo Imaging
Authors: Wu Wei , Yang Yanqing , Yang Yang , Yang Yuming , Zhang Kaiyuan , Guo Li , Ge Hongfei , Chen Xiaowei , Liu Jie , Feng Hua 
Published: March 2019

AbstractDesign and synthesis of new fluorophores with emission in the second near‐infrared window (NIR‐II, 1000–1700 nm) have fueled the advancement of in vivo fluorescence imaging. Organic NIR‐II probes particularly attract tremendous attention due to excellent stability and biocompatibility, which facilitate clinical translation. However, reported organic NIR‐II fluorescent agents often suffer from low quantum yield and complicated design. In this study, the acceptor unit of a known NIR‐I aggregation‐induced emission (AIE) luminogen (AIEgen) is molecularly engineered by varying a single atom from sulfur to selenium, leading to redshifted absorption and emission spectra. After formulation of the newly prepared AIEgen, the resultant AIE nanoparticles (referred as L897 NPs) have an emission tail extending to 1200 nm with a high quantum yield of 5.8%. Based on the L897 NPs, noninvasive vessel imaging and lymphatic imaging are achieved with high signal‐to‐background ratio and deep penetration. Furthermore, the L897 NPs can be used as good contrast agents for tumor imaging and image‐guided surgery due to the high tumor/normal tissue ratio, which peaks at 9.0 ± 0.6. This work suggests a simple strategy for designing and manufacturing NIR‐II AIEgens and demonstrates the potential of NIR‐II AIEgens in vessel, lymphatic, and tumor imaging.
Review on mechanism and process of surface polishing using lasers
Authors: Krishnan Arun , Fang Fengzhou 
Published: March 2019

AbstractLaser polishing is a technology of smoothening the surface of various materials with highly intense laser beams. When these beams impact on the material surface to be polished, the surface starts to be melted due to the high temperature. The melted material is then relocated from the ‘peaks to valleys’ under the multidirectional action of surface tension. By varying the process parameters such as beam intensity, energy density, spot diameter, and feed rate, different rates of surface roughness can be achieved. High precision polishing of surfaces can be done using laser process. Currently, laser polishing has extended its applications from photonics to molds as well as bio-medical sectors. Conventional polishing techniques have many drawbacks such as less capability of polishing freeform surfaces, environmental pollution, long processing time, and health hazards for the operators. Laser polishing on the other hand eliminates all the mentioned drawbacks and comes as a promising technology that can be relied for smoothening of initial topography of the surfaces irrespective of the complexity of the surface. Majority of the researchers performed laser polishing on materials such as steel, titanium, and its alloys because of its low cost and reliability. This article gives a detailed overview of the laser polishing mechanism by explaining various process parameters briefly to get a better understanding about the entire polishing process. The advantages and applications are also explained clearly to have a good knowledge about the importance of laser polishing in the future.
Near Miss in a Video Game: an Experimental Study
Authors: Finserås Turi Reiten , Krossbakken Elfrid , Pallesen Ståle , Mentzoni Rune , King Daniel L. , Griffiths Mark D. , Molde Helge 
Published: March 2019

AbstractModels to explain persistent and excessive gaming behavior have proposed that reward characteristics in video games influence gaming behavior, yet these characteristics have received minimal empirical attention to date. The present study employed an experimental approach to examine how a near miss and other different outcomes (a win or loss with small and large margin, respectively) influence gaming behavior and subjective experiences and evaluations of the game. A total of 40 participants competed against four avatars in a counterbalanced repeated measure design with four scenarios: (a) losing by a large margin, (b) losing by a small margin, (c) winning by a small margin, and (d) winning by a large margin. Outcome measurements included the urge to continue playing, affective response, game evaluation, and regret. Repeated measure ANOVAs with post hoc tests were employed to assess outcomes across the scenarios. Participants reported greater frustration and regret when losing compared to winning and tended to evaluate the games they won more positively than the games they lost. Participants felt more bored and less excited when they experienced a near miss compared to winning by a large margin. The results show that winning in video games influences players’ experiences and perceptions differently than losing.
Cobalt Sulfide Confined in N-Doped Porous Branched Carbon Nanotubes for Lithium-Ion Batteries
Authors: Zhou Yongsheng , Zhu Yingchun , Xu Bingshe , Zhang Xueji , Al-Ghanim Khalid A. , Mahboob Shahid 
Published: March 2019

Abstract
Lithium-ion batteries (LIBs) are considered new generation of large-scale energy-storage devices. However, LIBs suffer from a lack of desirable anode materials with excellent specific capacity and cycling stability. In this work, we design a novel hierarchical structure constructed by encapsulating cobalt sulfide nanowires within nitrogen-doped porous branched carbon nanotubes (NBNTs) for LIBs. The unique hierarchical Co9S8@NBNT electrode displayed a reversible specific capacity of 1310 mAh g−1 at a current density of 0.1 A g−1, and was able to maintain a stable reversible discharge capacity of 1109 mAh g−1 at a current density of 0.5 A g−1 with coulombic efficiency reaching almost 100% for 200 cycles. The excellent rate and cycling capabilities can be ascribed to the hierarchical porosity of the one-dimensional Co9S8@NBNT internetworks, the incorporation of nitrogen doping, and the carbon nanotube confinement of the active cobalt sulfide nanowires offering a proximate electron pathway for the isolated nanoparticles and shielding of the cobalt sulfide nanowires from pulverization over long cycling periods.
Optimizing vascular-access device decision-making in the era of midline catheters
Authors: Cawcutt Kelly A. , Hankins Richard J. , Micheels Teresa A. , Rupp Mark E. 
Published: March 2019

AbstractThis narrative review addresses vascular access device choice from peripheral intravenous catheters through central venous catheters, including the evolving use of midline catheters. The review incorporates best practices, published algorithms, and complications extending beyond CLABSI and phlebitis to assist clinicians in navigating complex vascular access decisions.
Work harassment in the UK and US nursing context
Authors: Farr-Wharton Ben , Brunetto Yvonne , Xerri Mathew , Shriberg Art , Newman Stefanie , Dienger Joy 
Published: March 2019

AbstractThis paper examines one type of negative work behaviour, work harassment, using two theoretical frameworks: Social Exchange Theory (SET) and Similarity-Attraction (SA). SET explains work harassment as a product of poor management practices, whereas using SA theory explains it as a result of the growing normalisation of high workloads. The study undertakes latent mean and path model comparison analysis using structural equation modelling of data from 189 nurses in the UK and 401 nurses in the USA. The findings indicate a good model fit showing a significant path from Leader Member Exchange (LMX) to work harassment, wellbeing and subsequent turnover intentions, with LMX fully mediating the path from LMX to wellbeing for UK nurses, but only partially mediating the same path for nurses in the USA. The findings suggest SET provides a better explanation for work harassment for UK nurses, whereas SA theory better explains the US nurse experience.
Reductions in body size of benthic macroinvertebrates as a precursor of the early Toarcian (Early Jurassic) extinction event in the Lusitanian Basin, Portugal
Authors: Piazza Veronica , Duarte Luís V. , Renaudie Johan , Aberhan Martin 
Published: March 2019

AbstractReduction of body size is a common response of organisms to environmental stress. Studying the early Toarcian succession in the Lusitanian Basin of Portugal, we tested whether the shell size of benthic marine communities of bivalves and brachiopods changed at and before the global, warming–related Toarcian oceanic anoxic event (T-OAE). Statistical analyses of shell size over time show that the mean shell size of communities decreased significantly before the T-OAE. This trend is distinct in brachiopods and is caused by larger-sized species becoming less abundant over time, whereas it is not significant in bivalves, suggesting a decoupled response to environmental stress. Reductions in shell size precede the decline in standardized sample-level species richness associated with the early Toarcian extinction event. Such decreases in the shell size of marine invertebrates, well before the onset of biodiversity change, suggest that reductions in body size more generally may be a precursor of a subsequent loss of species and turnover at the community level caused by climate change. Sedimentological evidence is against hypoxia as a driver of extinction and the preceding size decrease in the brachiopod fauna in the studied succession, although low oxygen levels are widely held responsible for elevated early Toarcian extinction rates globally. Reduction of mean shell size in brachiopods but stasis in bivalves is difficult to explain with ocean acidification, because experimental work shows that brachiopods can be resilient to lowered pH, albeit long-term metabolic costs and potential evolutionary adaptations are unknown. Rising early Toarcian temperatures in the Lusitanian Basin seem to be a plausible factor in both diversity decline associated with the T-OAE and the preceding reductions in mean shell size, because thermal tolerances in modern bivalves are among the highest within marine invertebrates.
Ten years of deep neck space abscesses
Authors: Buckley J , Harris A S , Addams-Williams J 
Published: March 2019

AbstractBackgroundThe incidence of deep neck space abscesses, which can result in significant morbidity and mortality, is rising. The aetiology is thought to be dental. However, this study suggests a reduction in tonsillectomies may be associated with the rise.MethodIn a retrospective cohort study, patients were identified by a clinical code within one hospital over 10 years. Evidence of preceding infection source, management, lifestyle risks, comorbidities and demographics were extracted.ResultsFifty-two patients were included: 23 (44 per cent) had concurrent or recent tonsillitis; 11 (21 per cent) had poor dental hygiene; 22 (42 per cent) were smokers; and 9 (17 per cent) had diabetes. The incidence of deep neck space abscess cases increased from 1 in 2006, to 15 in 2015 (correlation value 0.9; p = 0.00019).ConclusionThe incidence of deep neck space abscess cases is increasing. Risk factors include tonsillitis, smoking and dental infection. This paper adds to the growing evidence that deep neck space abscesses are increasingly related to tonsillitis, and questions whether the threshold for tonsillectomy has been raised too high.
Women and leasehold in rural Flanders, c. 1290 to c. 1570
Authors: Vervaet Lies 
Published: March 2019

AbstractResearch has emphasised the stability in female landholding between the thirteenth and seventeenth centuries, despite demographic shocks and fundamental economic changes. However, in this period, a new type of land exploitation emerges: leasehold. This article wants to introduce a gender perspective into the history of leasehold. It investigates women’s activities on the lease market in late medieval and sixteenth-century Flanders, a region where short-term and competitive leasehold spread early and widely. An analysis of the actual practice, making use of landlords’ manuals and accounts, demonstrates women’s decreasing participation at the lease market. Moreover, their marital status increasingly mattered: from the beginning of the fifteenth century only widows could hold land. This article also demonstrates that, next to marital status, the size of the holding had a marked influence on women’s opportunities. Finally, these results invite us to rethink the grounds of women’s growing participation at the labour market in post-Black Death Europe, since especially single women lost access to land, particularly to land offered on the lease market.
EU–Fatty Alcohols (Indonesia): Corporate Structure, Transfer Pricing, and Dumping
Authors: HAKOBYAN SHUSHANIK , TRACHTMAN JOEL P. 
Published: March 2019

AbstractThe EU–Fatty Alcohols decision of the Appellate Body addressed an important issue of the scope of permissible adjustments under Article 2.4 of the Agreement on Interpretation of Article VI of the GATT 1994, focusing on the ‘mark-up’ paid by an Indonesian exporter to a related company as a difference affecting price comparability between the export price and the normal value. The Appellate Body confirmed that the primary focus of the investigating authority's assessment is on whether the relationship between related companies can be demonstrated to be a factor that impacts the prices of the relevant transactions. This case raises the question of whether a harmonized approach to transfer pricing across different regulatory areas would be useful to bring greater consistency of treatment and certainty to international transactions.
POLARRIS: A POLArimetric Radar Retrieval and Instrument Simulator
Authors: Matsui Toshi , Dolan Brenda , Rutledge Steven A. , Tao Wei‐Kuo , Iguchi Takamichi , Barnum Julie , Lang Stephen E. 
Published: March 2019

AbstractThis paper introduces a synthetic polarimetric radar simulator and retrieval package, POLArimetric Radar Retrieval and Instrument Simulator (POLARRIS), for evaluating cloud‐resolving models (CRMs). POLARRIS is composed of forward (POLARRIS‐f) and inverse (retrieval and diagnostic) components (iPOLARRIS) to generate not only polarimetric radar observables (Zh, Zdr, Kdp, ρhv) but also radar‐consistent geophysical parameters such as hydrometeor identification, vertical velocity, and rainfall rates retrieved from CRM data. To demonstrate its application and uncertainties, POLARRIS is applied to simulations of a mesoscale convective system over the Southern Great Plains on 23 May 2011, using the Weather Research and Forecasting model with both spectral bin microphysics (SBM) and the Goddard single‐moment bulk 4ICE microphysics. Statistical composites reveal a significant dependence of simulated polarimetric observables (Zdr, Kdp) on the assumptions of the particle axis ratio (oblateness) and orientation angle distributions. The simulated polarimetric variables differ considerably between the SBM and 4ICE microphysics in part due to the differences in their ice particle size distributions as revealed by comparisons with aircraft measurements. Regardless of these uncertainties, simulated hydrometeor identification distributions overestimate graupel and hail fractions, especially from the simulation with SBM. To minimize uncertainties in forward model, the particle shape and orientation angle distributions of frozen particles should be predicted in a microphysics scheme in addition to the size distributions and particle densities.
Midlatitude Oceanic Cloud and Precipitation Properties as Sampled by the ARM Eastern North Atlantic Observatory
Authors: Giangrande Scott E. , Wang Die , Bartholomew Mary Jane , Jensen Michael P. , Mechem David B. , Hardin Joseph C. , Wood Robert 
Published: March 2019

AbstractMarine low clouds are critical to the climate system because of their extensive coverage and associated controls on boundary layer dynamics and radiative energy balance. The primary foci for this study are marine low cloud observations over a heavily instrumented site on the Azores archipelago in the Eastern North Atlantic and their associated raindrop size distribution (DSD) properties, relative low cloud contributions to the precipitation, and additional sampling (instrument, environmental) considerations. The contribution from low clouds (e.g., cloud top < 4 km) to the overall precipitation over midlatitude oceans is poorly understood, in part because of the lack of coupled, high‐quality measurements of precipitation and low cloud properties. Cloud regime and precipitation breakdowns performed for a multiyear (2014–2017) record emphasize diurnal precipitation and raindrop size distribution characteristics for both low and deeper clouds, as well as differences between the two disdrometer types used. Results demonstrate that marine low clouds over this Eastern North Atlantic location account for a significant (45%) contribution to the total rainfall and exhibit a diurnal cycle in cloud (thickness, top, and base) and precipitation characteristics similar to satellite records. Additional controls on observed surface rainfall characteristics of low clouds allowed by the extended ground‐based facility data sets are also explored. From those analyses, it is suggested that the synoptic state exerts a significant control on low cloud and surface precipitation properties.
Spatially Variable Increase in Rock Uplift in the Northern U.S. Cordillera Recorded in the Distribution of River Knickpoints and Incision Depths
Authors: Mitchell Nate A. , Yanites Brian J. 
Published: March 2019

AbstractLandscape evolution is driven by factors like tectonics and climate, and unraveling such factors can reveal the history recorded in landscape morphology. The northern U.S. Cordillera features many potential drivers, such as the Yellowstone plume, the extrusion of a large igneous province, and the drainage of large lakes. Among this complex geologic history, the drivers of transient incision in the Clearwater and Salmon watersheds of central Idaho are not well understood. To constrain the pattern of regional incision, we analyze the morphologies of 80 individual tributaries underlain by single lithologies. From north to south across our study area, knickpoint elevations increase from about 800 to 2,200 m, and incision depths increase from about 300 to 1,200 m. We use both numerical and analytical models to demonstrate that such a gradient could represent spatial variations in rock uplift. These findings suggest that transience is driven by a spatially variable increase in rock uplift that has disrupted a low‐relief paleolandscape, and the high steepness values of main drainages suggest that high rock‐uplift rates are still maintained to the present. Changes in rock uplift may be related to interactions between the Yellowstone plume and the lithosphere, although base level fall from the drainage of the Lake Idaho down the proto‐Snake River may be superimposed over these patterns in rock uplift. We show that careful, quantitative analyses of river profiles in geologically complex regions can differentiate between the influences of rock uplift and far‐field base level changes.
Leveraging Environmental Research and Observation Networks to Advance Soil Carbon Science
Authors: Weintraub Samantha R. , Flores Alejandro N. , Wieder William R. , Sihi Debjani , Cagnarini Claudia , Gonçalves Daniel Ruiz Potma , Young Michael H. , Li Li , Olshansky Yaniv , Baatz Roland , Sullivan Pamela L. , Groffman Peter M. 
Published: March 2019

AbstractSoil organic matter (SOM) is a critical ecosystem variable regulated by interacting physical, chemical, and biological processes. Collaborative efforts to integrate perspectives, data, and models from interdisciplinary research and observation networks can significantly advance predictive understanding of SOM. We outline how integrating three networks—the Long‐Term Ecological Research with a focus on ecological dynamics, the Critical Zone Observatories with strengths in landscape/geologic context, and the National Ecological Observatory Network with standardized multiscale measurements—can advance SOM knowledge. This integration requires improved data dissemination and sharing, coordinated data collection activities, and enhanced collaboration between empiricists and modelers within and across networks.