bluuebunny/crossref_metadata_2025_split huggingface dataset:
Politics and the plastic crisis: A review throughout the plastic life cycle
Authors: Nielsen Tobias D. , Hasselbalch Jacob , Holmberg Karl , Stripple Johannes 
Published: August 2019

AbstractThis article surveys the politics of plastics through a reading and analysis of more than 180 scientific articles in the fields of environmental science and environmental studies. Despite the many benefits of plastics, the global plastic system is increasingly being recognized as the source of severe environmental problems. Rather than orient the investigation around specific venues, levels, or architectures of governance, our survey first follows plastic through its life cycle, and then considers the major categories of plastic objects addressed in the current literature, and the different approaches taken to each category. The politics of plastics is a growing field of inquiry, with the most rapid expansion in the areas of marine pollution and microplastics. Our consideration of plastic flows reveals increasing politicization towards the latter end of the life cycle, that is, plastic as waste and pollution. Turning to plastic objects, we observe different forms of mobilization, and varying connections between flows and objects, which allow for multiple interpretations of what is at stake. In the closing section, we consider two recent trends in the plastic governance discussion that take a more holistic view of the plastic crisis: attempts to construct (a) a circular plastics economy and (b) global plastics conventions or treaties. We end the paper by highlighting the need for studies to further investigate the norms and practices that maintain the role of plastics in society, as well as the political and economic arrangements that secure its overabundance and low price.This article is categorized under:
Energy Policy and Planning > Economics and Policy
Fossil Fuels > Science and Materials
Fossil Fuels > Climate and Environment
Developing Dark Pessimism Towards the Justificatory Role of Introspective Reports
Authors: Irvine Elizabeth 
Published: August 2019

AbstractThis paper argues for a position of ‘dark pessimism’ towards introspective reports playing a strong justificatory role in consciousness science, based on the application of frameworks and concepts of measurement. I first show that treating introspective reports as measurements fits well within current discussions of the reliability of introspection, and argue that introspective reports must satisfy at least a minimal definition of measurement in order to play a justificatory role in consciousness science. I then show how treating introspective reports as measurements makes it possible to identify the foundational methodological problems that underlie much of the current philosophical and scientific debate about the status of introspective evidence in studying consciousness. I argue that these problems prevent introspective reports from playing a strong justificatory role and resolving long-standing debates in consciousness science, both in contemporary work and in the future.
The repatriation of the Palaeoamericans: Kennewick Man/the Ancient One and the end of a non-Indian ancient North America
Authors: KAKALIOURAS ANN M. 
Published: August 2019

AbstractThis article considers the repatriation of some the most ancient human skeletal remains from the United States as two sorts of ending: their end as objects of scientific study, and their end as ancient non-American Indian settlers of North America. In the 1990s, some prominent physical anthropologists and archaeologists began replacing ‘Palaeoindian’ with the new category of ‘Palaeoamerican’ to characterize the western hemisphere's earliest inhabitants. Kennewick Man/the Ancient One, a nearly nine-thousand-year-old skeleton, convinced some anthropologists that contemporary Native American people (descendants of Palaeoindians) were not biologically related to the very first American colonists. The concept of the Palaeoamerican therefore denied Native American people their long-held status as the original inhabitants of the Americas. New genetic results, however, have contradicted the craniometric interpretations that led to these perceptions, placing the most ancient American skeletons firmly back in the American Indian family tree. This article describes the story of Kennewick Man/the Ancient One, the most famous ‘Palaeoamerican’; explores how repatriation has been a common end for many North American collections (Palaeoindians included); and enumerates what kind of ending repatriation may represent materially and ethically for anthropological science.
Improved scaling laws for the shock-induced dispersal of a dense particle curtain
Authors: DeMauro Edward P. , Wagner Justin L. , DeChant Lawrence J. , Beresh Steven J. , Turpin Aaron M. 
Published: August 2019

Experiments were performed within Sandia National Labs’ Multiphase Shock Tube to measure and quantify the shock-induced dispersal of a shock/dense particle curtain interaction. Following interaction with a planar travelling shock wave, schlieren imaging at 75 kHz was used to track the upstream and downstream edges of the curtain. Data were obtained for two particle diameter ranges ($d_{p}=106{-}125$, $300{-}355~\unicode[STIX]{x03BC}\text{m}$) across Mach numbers ranging from 1.24 to 2.02. Using these data, along with data compiled from the literature, the dispersion of a dense curtain was studied for multiple Mach numbers (1.2–2.6), particle sizes ($100{-}1000~\unicode[STIX]{x03BC}\text{m}$) and volume fractions (9–32 %). Data were non-dimensionalized according to two different scaling methods found within the literature, with time scales defined based on either particle propagation time or pressure ratio across a reflected shock. The data show that spreading of the particle curtain is a function of the volume fraction, with the effectiveness of each time scale based on the proximity of a given curtain’s volume fraction to the dilute mixture regime. It is seen that volume fraction corrections applied to a traditional particle propagation time scale result in the best collapse of the data between the two time scales tested here. In addition, a constant-thickness regime has been identified, which has not been noted within previous literature.
Superharmonic instability of nonlinear travelling wave solutions in Hamiltonian systems
Authors: Sato Naoki , Yamada Michio 
Published: August 2019

The problem of linear instability of a nonlinear travelling wave in a canonical Hamiltonian system with translational symmetry subject to superharmonic perturbations is discussed. It is shown that exchange of stability occurs when energy is stationary as a function of wave speed. This generalizes a result proved by Saffman (J. Fluid Mech., vol. 159, 1985, pp. 169–174) for travelling wave solutions exhibiting a wave profile with reflectional symmetry. The present argument remains true for any non-canonical Hamiltonian system that can be cast in Darboux form, i.e. a canonical Hamiltonian form on a submanifold defined by constraints, such as a two-dimensional surface wave on a constant shearing flow, revealing a general feature of Hamiltonian dynamics.
SEX, GENDER, AND ROMANTIC INTIMACY IN SERVICEMEN'S LETTERS DURING THE SECOND WORLD WAR
Authors: TWELLS ALISON 
Published: August 2019

AbstractThis article explores sex and romance as under-examined aspects of wartime masculinities through a focus on letters from servicemen recipients of woollen ‘comforts’ to girls and women who knitted for them during the Second World War. It examines the tension between the cultural ideal of ‘temperate heroism’ that formed the hegemonic masculinity during the Second World War and evidence of predatory male sexuality and sexual violence, both in combat and on the home front. Servicemen's letters to anonymous knitters reveal many aspects of their emotional lives, including the widespread deployment of romance as a mechanism for maintaining morale. They also reveal that some men were able to manipulate their image as ‘heroes’ and make use of the comforts fund as a vehicle for engaging in sexually explicit correspondence and transgressive and deviant behaviours. A foregrounding of romance and sexuality suggests that we need to look again at arguments relating to the contiguity between military cultures and middle- and working-class civilian codes of respectable masculinity and male heterosexual expression. The article further engages with critiques in the history of masculinity of the neglect of working-class masculinities and the tendency to focus on cultural scripts about masculinity rather than what men actually did or felt.
The structure and migration patterns of the population of Uruguay through isonymy
Authors: Carrieri A. , Sans M. , Dipierri J. E. , Alfaro E. , Mamolini E. , Sandri M. , Rodríguez-Larralde A. , Scapoli C. , Barrai I. 
Published: August 2019

AbstractSurname distribution can be a useful tool for studying the genetic structure of a human population. In South America, the Uruguay population has traditionally been considered to be of European ancestry, despite its trihybrid origin, as proved through genetics. The aim of this study was to investigate the structure of the Uruguayan population, resulting from population movements and surname drift in the country. The distribution of the surnames of 2,501,774 people on the electoral register was studied in the nineteen departments of Uruguay. Multivariate approaches were used to estimate isonymic parameters. Isolation by Distance was measured by correlating isonymic and geographic distances. In the study sample, the most frequent surnames were consistently Spanish, reflecting the fact that the first immigration waves occurred before Uruguayan independence. Only a few surnames of Native origin were recorded. The effective surname number (α) for the entire country was 302, and the average for departments was 235.8 ± 19. Inbreeding estimates were lower in the south-west of the country and in the densely populated Montevideo area. Isonymic distances between departments were significantly correlated with linear geographic distance (p < 0.001) indicating continuously increasing surname distances up to 400 km. Surnames form clusters related to geographic regions affected by different historical processes. The isonymic structure of Uruguay shows a radiation towards the east and north, with short-range migration playing a major role, while the contribution of drift, considering the small variance of α, appears to be minor.
Intestinal parasites at the Late Bronze Age settlement of Must Farm, in the fens of East Anglia, UK (9th century B.C.E.)
Authors: Ledger Marissa L. , Grimshaw Elisabeth , Fairey Madison , Whelton Helen L. , Bull Ian D. , Ballantyne Rachel , Knight Mark , Mitchell Piers D. 
Published: August 2019

AbstractLittle is known about the types of intestinal parasites that infected people living in prehistoric Britain. The Late Bronze Age archaeological site of Must Farm was a pile-dwelling settlement located in a wetland, consisting of stilted timber structures constructed over a slow-moving freshwater channel. At excavation, sediment samples were collected from occupation deposits around the timber structures. Fifteen coprolites were also hand-recovered from the occupation deposits; four were identified as human and seven as canine, using fecal lipid biomarkers. Digital light microscopy was used to identify preserved helminth eggs in the sediment and coprolites. Eggs of fish tapeworm (Diphyllobothrium latum and Diphyllobothrium dendriticum), Echinostoma sp., giant kidney worm (Dioctophyma renale), probable pig whipworm (Trichuris suis) and Capillaria sp. were found. This is the earliest evidence for fish tapeworm, Echinostoma worm, Capillaria worm and the giant kidney worm so far identified in Britain. It appears that the wetland environment of the settlement contributed to establishing parasite diversity and put the inhabitants at risk of infection by helminth species spread by eating raw fish, frogs or molluscs that flourish in freshwater aquatic environments, conversely the wetland may also have protected them from infection by certain geohelminths.
Detecting schizophrenia at the level of the individual: relative diagnostic value of whole-brain images, connectome-wide functional connectivity and graph-based metrics
Authors: Lei Du , Pinaya Walter H. L. , van Amelsvoort Therese , Marcelis Machteld , Donohoe Gary , Mothersill David O. , Corvin Aiden , Gill Michael , Vieira Sandra , Huang Xiaoqi , Lui Su , Scarpazza Cristina , Young Jonathan , Arango Celso , Bullmore Edward , Qiyong Gong , McGuire Philip , Mechelli Andrea 
Published: August 2019

AbstractBackgroundPrevious studies using resting-state functional neuroimaging have revealed alterations in whole-brain images, connectome-wide functional connectivity and graph-based metrics in groups of patients with schizophrenia relative to groups of healthy controls. However, it is unclear which of these measures best captures the neural correlates of this disorder at the level of the individual patient.MethodsHere we investigated the relative diagnostic value of these measures. A total of 295 patients with schizophrenia and 452 healthy controls were investigated using resting-state functional Magnetic Resonance Imaging at five research centres. Connectome-wide functional networks were constructed by thresholding correlation matrices of 90 brain regions, and their topological properties were analyzed using graph theory-based methods. Single-subject classification was performed using three machine learning (ML) approaches associated with varying degrees of complexity and abstraction, namely logistic regression, support vector machine and deep learning technology.ResultsConnectome-wide functional connectivity allowed single-subject classification of patients and controls with higher accuracy (average: 81%) than both whole-brain images (average: 53%) and graph-based metrics (average: 69%). Classification based on connectome-wide functional connectivity was driven by a distributed bilateral network including the thalamus and temporal regions.ConclusionThese results were replicated across the three employed ML approaches. Connectome-wide functional connectivity permits differentiation of patients with schizophrenia from healthy controls at single-subject level with greater accuracy; this pattern of results is consistent with the ‘dysconnectivity hypothesis’ of schizophrenia, which states that the neural basis of the disorder is best understood in terms of system-level functional connectivity alterations.
Exercise Instructors for Older Adult Fitness: A Review of the Literature
Authors: Harvey Kelsey , Griffin Meridith 
Published: August 2019

ABSTRACTGroup-exercise instructors are a vital social determinant of exercise enjoyment, attendance, and adherence. Instructors also affect the degree to which physical cultures are socially inclusive. In order to elucidate the roles that instructors play in affecting these outcomes, we conducted a scoping review. Scoping reviews are a preliminary method for assessing the breadth and depth of existing literature in order to identify key themes and gaps therein. Based on Arksey and O’Malley’s (2005) framework, we identified 52 articles and book chapters, 33 of which were older-adult specific, using a university search engine that simultaneously searches multiple databases. We conceptually mapped the literature, which revealed instructors’ vital roles as: (1) constructors of group social cohesion, (2) cultural intermediaries, (3) competent practitioners, (4) leaders and communicators, and (5) educators. Of these, the instructor’s educative role lacks empirical attention. We conclude with implications for future research, practice, and policy.
Possibilities and Limits of Southern European Socialism in the Iberian Peninsula: French, Portuguese and Spanish Socialists in the mid-1970s
Authors: Granadino Alan 
Published: August 2019

AbstractThis article discusses the relations between the French, Portuguese and Spanish socialist parties during the transitions to democracy in the Iberian Peninsula (1974–7). It focuses on the attempt of these parties to establish a distinctive ideological trend, Southern European socialism. The main argument is that the French socialists attempted to promote their ideological line – and predominantly the union between socialists and communists – in the Iberian Peninsula during the transitions to democracy. The Portuguese Socialist Party and the Spanish Socialist Workers Party initially considered following this line. However, the radicalisation of the Portuguese revolution in the sensitive context of Cold War détente, as well as the involvement of the European social democrats in both Portugal and Spain against the union of the left, prevented this model from being further considered by the Spanish and Portuguese socialist parties. Nevertheless, all these parties showed interest in promoting a common Southern European Socialist identity that differed from European social democracy as well as from Soviet communism, considering it useful in the struggle for hegemony within the left.
A novel compact lowpass filter with sharp roll-off and wide stopband
Authors: Hayati M. , Abdipour AS. , Abdipour AR. 
Published: August 2019

AbstractIn this paper, a microstrip lowpass filter adopting two main resonators with steep transition band and wide rejection band has been introduced. The first main resonance cell consists of meandered transmission lines which are loaded by modified T-shaped patches. The second main resonator is composed of high-impedance lines loaded by polygon patches. To obtain a steep skirt performance, the first and second resonators have been combined. Moreover, employing eight high–low impedance folded stubs and two rectangular open-stubs as suppressing cells has resulted in improving the stopband features. To comprehend the frequency behavior of the employed resonators and also their combination, the formulas of the transmission coefficient, reflection coefficient, and the transmission zeros of their equivalent LC circuits have been extracted, separately. According to the measurement results, the −3 dB operating frequency of this filter is 1.65 GHz. Moreover, a relative stopband bandwidth equal to 166% with a corresponding attenuation level of 23 dB and a sharp roll-off rate (393.61 dB/GHz) have been achieved. In the passband region from DC to 1.632 GHz, the insertion loss and return loss are better than 0.0763 and 15.85 dB, respectively, proving an acceptable in-band performance. Finally, the implemented structure brings about a high figure-of-merit equal to 81 672.
Convective Heating Leads to Self‐Aggregation by Generating Available Potential Energy
Authors: Yang Da 
Published: August 2019

AbstractThe moisture‐entrainment‐convection (MEC) feedback posits that a moist environment favors deep convection, which further moistens the atmosphere through its associated circulation and detrainment. The MEC feedback has been proposed to be crucial to spontaneous convective aggregation. Here we test this hypothesis by performing minimal cloud‐resolving simulations, without the buoyancy effect due to water vapor, evaporation of rain, or radiative and surface‐flux feedbacks. Convection can self‐aggregate in this minimal simulation, in which the MEC feedback is active. We then switch off this feedback by relaxing moisture to its horizontal mean over a time scale of 3 hr. Convection still self‐aggregates in this mechanism‐denial experiment, suggesting that the MEC feedback is not essential to self‐aggregation. We further show that convective heating coincides with positive temperature anomalies, generating available potential energy. Therefore, we propose that this convective heating‐overturning circulation feedback can lead to spontaneous development of large‐scale circulations.
Evaluation of Shallow‐Cumulus Entrainment Rate Retrievals Using Large‐Eddy Simulation
Authors: Drueke S. , Kirshbaum D. J. , Kollias P. 
Published: August 2019

AbstractA complete and quantitative understanding of cumulus entrainment remains elusive, in part due to the difficulty of directly observing cloud entrainment rates. Multiple approaches to ground‐based observational retrieval of bulk fractional entrainment rates (ε) within cumuli have been developed, such as the parcel model by Jensen and Del Genio (JDG, 2006, https://doi.org/10.1175/JCLI3722.1) and Entrainment Rate In Cumulus Algorithm (ERICA) by Wagner et al. (2013, https://doi.org/10.1175/JTECH-D-12-00187.1). In this paper, a new cumulus entrainment retrieval based on a turbulent kinetic energy (TKE) similarity theory is presented. This method estimates ε based on only the environmental and subcloud conditions. By conducting large‐eddy simulations of a range of continental and maritime shallow cumulus convection cases as Observing System Simulations Experiments, the first numerical verification of the three retrieval methods is produced. These simulations consider a broad range of shallow cumulus environments along with variations of the numerical configuration. The diagnosed ε from these simulations is found to be robustly larger in cumuli over the ocean than in cumuli over land. For continental cumuli, the experiments also reveal a diurnal cycle with increasing ε in the late afternoon. These diagnosed ε serve as the “truth” against which the pseudo‐retrieved entrainment rates from several different implementations of each retrieval are verified. Overall, the simpler JDG and TKE retrievals outperform the more sophisticated ERICA method and better capture the sensitivity to continentality. Only the TKE method reproduces the diurnal variations in ε within continental cumuli. The mean error in the ε retrievals are between 20% and 30% for the TKE and JDG methods, but 50% for ERICA.
MJO Propagation Processes and Mean Biases in the SubX and S2S Reforecasts
Authors: Kim Hyemi , Janiga Matthew A. , Pegion Kathy 
Published: August 2019

AbstractThe Madden‐Julian oscillation (MJO) is the leading source of global subseasonal predictability; however, many dynamical forecasting systems struggle to predict MJO propagation through the Maritime Continent. Better understanding the biases in simulated physical processes associated with MJO propagation is the key to improve MJO prediction. In this study, MJO prediction skill, propagation processes, and mean state biases are evaluated in reforecasts from models participating in the Subseasonal Experiment (SubX) and Subseasonal to Seasonal (S2S) prediction projects. SubX and S2S reforecasts show MJO prediction skill out to 4.5 weeks based on the Real‐time Multivariate MJO index consistent with previous studies. However, a closer examination of these models' representation of MJO propagation through the Maritime Continent reveals that they fail to predict the MJO convection, associated circulations, and moisture advection processes beyond 10 days with most of models underestimating MJO amplitude. The biases in the MJO propagation can be partly associated with the following mean biases across the Indo‐Pacific: a drier low troposphere, excess surface precipitation, more frequent occurrence of light precipitation rates, and a transition to stronger precipitation rates at lower humidity than in observations. This indicates that deep convection occurs too frequently in models and is not sufficiently inhibited when tropospheric moisture is low, which is likely due to the representation of entrainment.