bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spatial interdependence and instrumental variable models
Authors: Betz Timm , Cook Scott J. , Hollenbach Florian M. 
Published: January 2019

AbstractInstrumental variable (IV) methods are widely used to address endogeneity concerns. Yet, a specific kind of endogeneity – spatial interdependence – is regularly ignored. We show that ignoring spatial interdependence in the outcome results in asymptotically biased estimates even when instruments are randomly assigned. The extent of this bias increases when the instrument is also spatially clustered, as is the case for many widely used instruments: rainfall, natural disasters, economic shocks, and regionally- or globally-weighted averages. Because the biases due to spatial interdependence and predictor endogeneity can offset, addressing only one can increase the bias relative to ordinary least squares. We demonstrate the extent of these biases both analytically and via Monte Carlo simulation. Finally, we discuss a general estimation strategy – S-2SLS – that accounts for both outcome interdependence and predictor endogeneity, thereby recovering consistent estimates of predictor effects.
Non-Zero Radial Solutions for Elliptic Systems with Coupled Functional BCs in Exterior Domains
Authors: Cianciaruso Filomena , Infante Gennaro , Pietramala Paolamaria 
Published: January 2019

AbstractWe prove new results on the existence, non-existence, localization and multiplicity of non-trivial radial solutions of a system of elliptic boundary value problems on exterior domains subject to non-local, nonlinear, functional boundary conditions. Our approach relies on fixed point index theory. As a by-product of our theory we provide an answer to an open question posed by do Ó, Lorca, Sánchez and Ubilla. We include some examples with explicit nonlinearities in order to illustrate our theory.
POVERTY'S PASTS: A CASE FORLONGUE DURÉESTUDIES
Authors: STEPHENS RHIANNON 
Published: January 2019

AbstractThis article examines how historians have approached the history of poverty in Africa before European colonisation. From an earlier focus on the emergence of class difference to more recent studies on the emergence of poverty, scholars have demonstrated the longevity of economic inequality in Africa. This historiography counters a linear view of the growth of economic inequality and the idea that poverty is a necessary corollary of wealth. The article then considers how historians have studied the meanings of poverty within particular societies to the nineteenth century allowing us to move beyond the inadequacy of quantitative data. It ends by arguing for morelongue duréestudies of poverty in Africa with a focus on the qualitative and on the internal dynamics of particular societies. This will improve our knowledge about how colonial rule changed the experience and reality of poverty for people across the continent and form a basis for comparative studies.
Indian Petitioning and Colonial State-Formation in Eighteenth-Century Bengal
Authors: TRAVERS ROBERT 
Published: January 2019

AbstractThis article explores the role of Indian petitioning in the process of consolidating British power after the East India Company's military conquest of Bengal in the late eighteenth century. The presentation of written petitions (often termed‘arziin Persian) was a pervasive form of state-subject interaction in early modern South Asia that carried over, in modified forms, into the colonial era. The article examines the varied uses of petitioning as a technology of colonial state-formation that worked to establish the East India Company's headquarters in Calcutta as the political capital of Bengal and the Company as a sovereign source of authority and justice. It also shows how petitioning became a site of anxiety for both colonial rulers and Indian subjects, as British officials struggled to respond to a mass of Indian ‘complaints’ and to satisfy the expectations and norms of justice expressed by petitioners. It suggests that British rulers tried to defuse the perceived political threat of Indian petitioning by redirecting petitioners into the newly regulated spaces of an emergent colonial judiciary.
Hormonal and psychological factors in nausea and vomiting during pregnancy
Authors: Dekkers Guus W.F. , Broeren Maarten A.C. , Truijens Sophie E.M. , Kop Willem J. , Pop Victor J.M. 
Published: January 2019

AbstractBackgroundThe aetiology of nausea and vomiting during pregnancy (NVP) is multifactorial, but the relative contribution of biological and psychological determinants is insufficiently understood. We examined the association of human chorionic gonadotropin (hCG), thyroid hormones (thyroid-stimulating hormone and thyroxin) and psychological factors with NVP.MethodsBlood chemistry and psychological measures were obtained in 1682 pregnant women participating in the Holistic Approach to Pregnancy and the first Postpartum Year (HAPPY) study between 12 and 14 weeks of gestation. The presence of NVP was measured using the Pregnancy-Unique Quantification of Emesis scale. Depressive symptoms were assessed using the Edinburgh Depression Scale. Multivariable logistic regression analyses were used to investigate the independent role of hCG, thyroid hormones and depression as related to NVP, adjusting for age, body mass index, education, parity, smoking status, unplanned pregnancy and history of depression.ResultsElevated levels of NVP were observed in 318 (18.9%) participants. High hCG levels [odds ratio (OR) = 1.47, 95% confidence interval (CI) = 1.11–1.95], elevated depressive symptoms in the first trimester (OR = 1.67, 95% CI = 1.15–2.43) and a history of depression (OR = 1.53, 95% CI = 1.11–2.11) were independently related to high NVP. Multiparity (OR = 1.47, 95% CI = 1.12–1.92) and younger age (OR = 0.91, 95% CI = 0.87–0.94) were also associated with high NVP, whereas (sub)clinical hyperthyroidism was not related to high NVP.ConclusionsThe current study is the first to demonstrate that a combination of hCG hormone and psychological factors are independently related to nausea and vomiting during early pregnancy.
How does language proficiency affect children’s iconic gesture use?
Authors: ZVAIGZNE MEGHAN , OSHIMA-TAKANE YURIKO , HIRAKAWA MAKIKO 
Published: January 2019

ABSTRACTPrevious research investigating the relationship between language proficiency and iconic gesture use has produced inconsistent findings. This study investigated whether a linear relationship was assumed although it is a quadratic relationship. Iconic co-speech gesture use by 4- to 6-year-old French–Japanese bilinguals with two levels of French proficiency (intermediate and low) but similar levels of Japanese proficiency was compared with that of high-proficiency French monolinguals (Study 1) and Japanese monolinguals with similar proficiency to the bilinguals (Study 2). To control the information participants communicated, a dynamic referential communication task was used; a difference between two cartoons had to be communicated to an experimenter. Study 1 showed a significant quadratic relationship between proficiency and iconic gesture use in French; the intermediate-proficiency bilinguals gestured least among the three proficiency groups. The monolingual and bilingual groups with similar Japanese proficiency in Study 2 gestured at similar rates. It is suggested that children gestured for different reasons depending on their language proficiency and the cognitive resources available for the task.
Urban–rural disparities in cardiovascular disease risks among middle-aged and older Chinese: two decades of urbanisation
Authors: Zhang Nan 
Published: January 2019

AbstractChina has been undergoing dramatic socio-economic and demographic changes in the last few decades. The rapid growth of the ageing population will pose tremendous challenges to its public health and social welfare system. This study aims to examine how urbanisation has impacted cardiovascular disease (CVD) risks among middle-aged and older Chinese in two decades, from 1991 to 2011. Data were drawn from a nationwide longitudinal data-set of the China Health and Nutrition Survey (CHNS) (sweeps 1991, 1993, 1997, 2000, 2004, 2006, 2009 and 2011). Participants aged ⩾45 years old were included. A dynamic urbanisation index was created for each community (village or neighbourhood) based on community-level data that can reveal the heterogeneity within and across places and capture dimensions of social, economic and physical characteristics of urban living over time and space. Multi-level modelling analyses (level 1: occasions; level 2: individuals; level 3: households; level 4: communities) were performed on outcomes of CVD risks such as body mass index, waist circumference, and systolic and diastolic blood pressure. The results show upward trends in all CVD risks for both genders over 20 years of urbanisation after adjustment for socio-economic and demographic confounders. Urbanisation in China is associated with absolute increases in CVD risks over time among its middle-aged and older people, despite its contribution to relative reduction of the rural–urban gap over time. This is particularly true for women from the least urbanised areas. It is relevant to inform policy-making processes to target the most vulnerable groups of older people in China during its rapid urbanisation process. There is a possibility for policy intervention to reduce inequality during the process of China's planned urbanisation.
A Preliminary, Randomized-Controlled Trial of Mindfulness and Game-Based Executive Function Trainings to Promote Self-Regulation in Internationally-Adopted Children
Authors: Lawler Jamie M. , Esposito Elisa A. , Doyle Colleen M. , Gunnar Megan R. 
Published: January 2019

AbstractAlthough many children adopted internationally show remarkable recovery once placed in families, as a group they continue to exhibit persisting developmental deficits and delays in self-regulation. The current study uses a stratified, randomized, controlled trial to evaluate the effects of mindfulness-based and executive function trainings (EFTs) on internationally adopted (IA) children's self-regulation, including effortful/inhibitory control, attention, delay of gratification, and emotion-regulation. IA children ages 6–10 years were randomized into mindfulness training (MT), EFT, or no intervention (NI) groups. The MT and EFT groups attended 12 one-hour group sessions. Ninety-six children (MT, n = 33; EFT, n = 32; NI, n = 31) completed the study and were tested on computerized and non-computerized measures of self-regulation. Compared with the NI group, the MT group improved delay of gratification, and the EFT group improved inhibitory control and selective attention. There was no effect of either intervention on emotion regulation. MTs and EFTs show promise for improving self-regulation in IA children.
THE LOGIC OF AVICENNA BETWEEN AL-QIYĀS AND MANṬIQ AL-MAŠRIQIYYĪN
Authors: Chatti Saloua 
Published: January 2019

AbstractAvicenna's logic is presented in many treatises, of which the most important is Al-Qiyās (Prior analytics), which is included in his encyclopaedic book Al-Šifā’. But the treatise entitled Manṭiq al-mašriqiyyīn is said to express Avicenna's own logic by some commentators. One can thus ask: is this treatise in conflict with Al-Qiyās and the other logical writings? In this paper, we will answer this question by comparing Avicenna's analyses of the absolute – i. e. non modal – propositions. We will show that there is no radical difference between both treatises in this respect, since most conditions added to the absolute propositions in Al-Qiyās can be found in Manṭiq al-mašriqiyyīn. These conditions are: (1) “as long as S exists”, (2) “as long as it is S”, (3) “as long as it is P”, (4) “at some times”, (5) “at one determined time”, (6) “sometimes but not permanently”. In Manṭiq al-mašriqiyyīn, the ḍarūrīya contains (1), the lāzima contains (2), the muntašira contains (4), the mafrūḍa contains (5), the wujūdiyya contains (6), but (3) is abandoned. The waqtiyya was evoked in Al-Qiyās, although not classified. So the temporal analysis initiated in Al-Qiyās is pursued and developed in Manṭiq al-mašriqiyyīn, even if in the latter it is sometimes confused.
Characteristics Comparison of Neon, Argon, and Krypton Ion Emissions from Gas Field Ionization Sources with a Single-Atom Tip
Authors: Shichi Hiroyasu , Matsubara Shinichi , Hashizume Tomihiro 
Published: January 2019

AbstractA scanning ion beam instrument equipped with a gas field ionization source (GFIS) has been commercialized, but only helium and neon are currently available as GFISs. In this study, the characteristics of neon, argon, and krypton ion emissions from a single-atom tip are compared, specifically for faster fabrication by milling of a silicon sample. Although the boiling point of argon is about 87 K, our experiments on characterizing argon ion emission can be carried out at temperatures of about 50 K at an argon gas pressure lower than 0.1 Pa. Argon exhibits ion current characteristics, as a function of tip voltage, between those of neon and krypton. The value obtained by multiplying the ion emission current by the sputtering yield is suitable for a figure of merit (FOM) for faster fabrication. The FOM for argon is the highest among the three ion species. This value must be extensively evaluated from the viewpoint of practical nano-fabrication application. The instabilities of neon, argon, and krypton ion currents (3σ) become as low as 8% in 1 h, which is sufficient for fabrication applications. We conclude that an argon or krypton GFIS ion beam instrument will be a useful tool for nano-fabrication.
The Genetic and Environmental Relationship Between Childhood Behavioral Inhibition and Preadolescent Anxiety
Authors: Bourdon Jessica L. , Savage Jeanne E. , Verhulst Brad , Carney Dever M. , Brotman Melissa A. , Pine Daniel S. , Leibenluft Ellen , Roberson-Nay Roxann , Hettema John M. 
Published: January 2019

AbstractThis study uses novel approaches to examine genetic and environmental influences shared between childhood behavioral inhibition (BI) and symptoms of preadolescent anxiety disorders. Three hundred and fifty-two twin pairs aged 9–13 and their mothers completed questionnaires about BI and anxiety symptoms. Biometrical twin modeling, including a direction-of-causation design, investigated genetic and environmental risk factors shared between BI and social, generalized, panic and separation anxiety. Social anxiety shared the greatest proportion of genetic (20%) and environmental (16%) variance with BI with tentative evidence for causality. Etiological factors underlying BI explained little of the risk associated with the other anxiety domains. Findings further clarify etiologic pathways between BI and anxiety disorder domains in children.
Dispersal and Frequency of Glyphosate-Resistant and Glyphosate-Tolerant Weeds in Soybean-producing Edaphoclimatic Microregions in Brazil
Authors: Lucio Felipe Ridolfo , Kalsing Augusto , Adegas Fernando Storniolo , Rossi Caio Vitagliano Santi , Correia Núbia Maria , Gazziero Dionisio Luiz Pisa , da Silva Alexandre Ferreira 
Published: January 2019

AbstractGlyphosate-resistant (GR) and glyphosate-tolerant weeds cause considerable yield losses and represent a growing threat to soybean production systems. Despite the relevance of this topic, few studies have evaluated the dispersal of these species in Brazil. The objective of this study was to evaluate the dispersal and frequency of known GR and glyphosate-tolerant weeds in soybean-producing microregions. A total of 2,481 interviews were conducted in different regions of Brazil. The interviews were stratified among 20 edaphoclimatic microregions (ECRs) to cover all of the country’s soybean-producing regions. A minimum number of interviews was estimated to generate a margin of error of ≤10% within the ECRs and ≤5% in the country. The values of the farmers’ responses were extrapolated to the total soybean production area of each ECR and the country as a whole, and the absolute values of each response were normalized as percentage values. The dispersal and management data demonstrate a loss of efficiency of glyphosate-resistance technology. Species that are naturally tolerant to glyphosate such as goosegrass, Commelina spp., and Ipomoea spp. had a greater presence in the ECRs, as did the resistant biotypes, particularly Conyza spp. and sourgrass, due to the large area cultivated with GR soybean, where glyphosate has been used with high frequency.
When Will Current Climate Extremes Affecting Maize Production Become the Norm?
Authors: Zampieri M. , Ceglar A. , Dentener F. , Dosio A. , Naumann G. , van den Berg M. , Toreti A. 
Published: January 2019

AbstractWe estimate the effects of climate anomalies (heat stress and drought) on annual maize production, variability, and trend from the country level to the global scale using a statistical model. Moderate climate anomalies and extremes are diagnosed with two indicators of heat stress and drought computed over maize growing regions during the most relevant period of maize growth. The calibrated model linearly combines these two indicators into a single Combined Stress Index. The Combined Stress Index explains 50% of the observed global production variability in the period 1980–2010. We apply the model on an ensemble of high‐resolution global climate model simulations. Global maize losses, due to extreme climate events with 10‐year return times during the period 1980–2010, will become the new normal already at 1.5 °C global warming levels (approximately 2020s). At 2 °C warming (late 2030s), maize areas will be affected by heat stress and drought never experienced before, affecting many major and minor production regions.
Contrasting Mechanical and Hydraulic Properties of Wet and Dry Fault Zones in a Proposed Shale‐Hosted Nuclear Waste Repository
Authors: Orellana Luis Felipe , Giorgetti Carolina , Violay Marie 
Published: January 2019

AbstractThe underground disposal of high‐level nuclear waste is a pressing issue for several countries. In Switzerland, the Opalinus Clay formation is a shale with favorable barrier properties. However, small‐to‐large faults intersecting the formation bring the long‐term integrity of the future repositories into question. Here we present the first systematic laboratory study on the frictional strength, stability, dilatancy, and permeability of simulated Opalinus Clay gouge under typical repository conditions. Wet gouges exhibit an extremely low coefficient of friction (μf~0.16), velocity‐strengthening behavior, and shear‐enhanced dilatancy at the onset of slip, and permeability increase. Conversely, dry gouges remain weak (μf~0.36) but exhibit a transition from unstable to stable sliding with increasing sliding velocity. Thus, we infer that faults hosted in Opalinus Clay could be easily reactivated via aseismic creep, possibly acting as poor fluid conduits. However, if temporarily dried, the faults become potentially unstable, at least, at low sliding velocities (<~10 μm/s).
Real‐Time Coseismic Slip Estimation via the GNSS Carrier Phase to Fault Slip Approach: A Case Study of the 2016 Kumamoto Earthquake
Authors: Tanaka Yusuke , Ohta Yusaku , Miyazaki Shin'ichi 
Published: January 2019

AbstractWe investigate the feasibility of Global Navigation Satellite System (GNSS)‐based deformation monitoring that detects coseismic fault slip directly from GNSS carrier phases without conventional positioning analysis. This method, which we call the phase‐to‐slip (PTS) method, does not require high‐quality orbital information because it relies only on changes in azimuthal site‐to‐satellite ranges. With this method, computational costs for real‐time seismic monitoring can be reduced. Here we applied the PTS method to the mainshock of the 2016 Kumamoto earthquake by modifying the original algorithm and using both precise orbits by International GNSS Service (IGS) and broadcast orbits. In both cases, obtained coseismic slip distributions agree well with previous studies. Calculated surface displacements from inferred slip distributions also agree with traditional positioning analysis. These results suggests that the PTS method may be useful as a supplement to currently operated deformation monitoring system, especially when external orbit and clock information are not accessible.
Global Mean Surface Temperature Response to Large‐Scale Patterns of Variability in Observations and CMIP5
Authors: Kajtar Jules B. , Collins Matthew , Frankcombe Leela M. , England Matthew H. , Osborn Timothy J. , Juniper Marcus 
Published: January 2019

AbstractGlobal mean surface temperature (GMST) fluctuates over decadal to multidecadal time scales. Patterns of internal variability are partly responsible, but the relationships can be conflated by anthropogenically forced signals. Here we adopt a physically based method of separating internal variability from forced responses to examine how trends in large‐scale patterns, specifically the Interdecadal Pacific Oscillation (IPO) and Atlantic Multidecadal Variability (AMV), influence GMST. After removing the forced responses, observed variability of GMST is close to the central estimates of Coupled Model Intercomparison Project phase 5 simulations, but models tend to underestimate IPO variability at time scales >10 years, and AMV at time scales >20 years. Correlations between GMST trends and these patterns are also underrepresented, most strongly at 10‐ and 35‐year time scales, for IPO and AMV, respectively. Strikingly, models that simulate stronger variability of IPO and AMV also exhibit stronger relationships between these patterns and GMST, predominately at the 10‐ and 35‐year time scales, respectively.
A Fragment of Columbia Supercontinent: Insight for Cathaysia Block Basement From Tectono‐Magmatic Evolution and Mantle Heterogeneity
Authors: Xia Yan , Xu Xisheng 
Published: January 2019

AbstractThe origin of the Cathaysia block and its position in Columbia supercontinent are still enigmatic. Paleoproterozoic magmatisms developed in the Cathaysia block due to two episodes of continental back‐arc extension range in ages of circa 1.88–1.85 and 1.78–1.77 Ga. A long‐lived ultradepleted mantle domain with highly incompatible element depletion related to average depleted mantle once underlaid the Cathaysia block is revealed by the highly depleted Hf‐Nd isotopes of the Paleoproterozoic meta‐mafic rocks. A self‐consistent set of geological, geochronological, and geochemical data indicate that the Cathaysia was assembled and then maintained a position off the southern margin of North Australia Craton from the assembly to the accretion of Columbia supercontinent (circa 1.90 to 1.74 Ga). Given the evidence for Cathaysia block, mantle heterogeneity might provide an alternative approach of supercontinent reconstruction.