bluuebunny/crossref_metadata_2025_split huggingface dataset:
An extension of the structured singular value to nonlinear systems with application to robust flutter analysis
Authors: Iannelli Andrea , Lowenberg Mark , Marcos Andrés 
Published: September 2020

AbstractThe paper discusses an extension of $$\mu$$
μ
(or structured singular value), a well-established technique from robust control for the study of linear systems subject to structured uncertainty, to nonlinear polynomial problems. Robustness is a multifaceted concept in the nonlinear context, and in this work the point of view of bifurcation theory is assumed. The latter is concerned with the study of qualitative changes of the steady-state solutions of a nonlinear system, so-called bifurcations. The practical goal motivating the work is to assess the effect of modeling uncertainties on flutter, a dynamic instability prompted by an adverse coupling between aerodynamic, elastic, and inertial forces, when considering the system as nonlinear. Specifically, the onset of flutter in nonlinear systems is generally associated with limit cycle oscillations emanating from a Hopf bifurcation point. Leveraging $$\mu$$
μ
and its complementary modeling paradigm, namely linear fractional transformation, this work proposes an approach to compute margins to the occurrence of Hopf bifurcations for uncertain nonlinear systems. An application to the typical section case study with linear unsteady aerodynamic and hardening nonlinearities in the structural parameters will be presented to demonstrate the applicability of the approach.
Marriage and Union Formation in the United States: Recent Trends Across Racial Groups and Economic Backgrounds
Authors: Bloome Deirdre , Ang Shannon 
Published: September 2020

AbstractFamily formation in the United States has changed dramatically: marriage has become less common, nonmarital cohabitation has become more common, and racial and economic inequalities in these experiences have increased. We provide insights into recent U.S. trends by presenting cohort estimates for people born between 1970 and 1997, who began forming unions between 1985 and 2015. Using Panel Study of Income Dynamics data, we find that typical ages at marriage and union formation increased faster across these recent cohorts than across cohorts born between 1940 and 1969. As fewer people married at young ages, more cohabited, but the substitution was incomplete. We project steep declines in the probability of ever marrying, declines that are larger among Black people than White people. We provide novel information on the intergenerational nature of family inequalities by measuring parental income, wealth, education, and occupational prestige. Marriage declines are particularly steep among people from low-income backgrounds. Black people are overrepresented in this low-income group because of discrimination and opportunity denial. However, marriage declines are larger among Black people than White people across parental incomes. Further, most racial differences in marriage occur among people from similar socioeconomic backgrounds. Family inequalities increasingly reflect both economic inequalities and broader racial inequalities generated by racist structures; in turn, family inequalities may prolong these other inequalities across generations.
The Effects of Enhanced Enforcement at Mexico’s Southern Border: Evidence From Central American Deportees
Authors: Flores Fernanda Martínez 
Published: September 2020

Abstract
Immigration enforcement cooperation between final-destination and transit countries has increased in the last decades. I examine whether the Southern Border Plan, an immigration enforcement program implemented by the Mexican government in 2014, has curbed intentions of unauthorized migrants from El Salvador, Guatemala, and Honduras to migrate to the United States. I use the announcement of the Southern Border Plan to implement a difference-in-differences approach and compare the evolution of short-run intentions to engage in additional unauthorized crossings of Central American (treatment group) relative to Mexican deportees (comparison group). The findings suggest that increased enforcement in Mexico decreases the likelihood of attempting repeated unauthorized crossings.
Driving lesson or driving test?: A&nbsp;metaphor to help faculty separate feedback from assessment
Authors: Brand Paul L. P. , Jaarsma A. Debbie C. , Van der Vleuten Cees P. M. 
Published: September 2020

Although there is consensus in the medical education world that feedback is an important and effective tool to support experiential workplace-based learning, learners tend to avoid the feedback associated with direct observation because they perceive it as a high-stakes evaluation with significant consequences for their future. The perceived dominance of the summative assessment paradigm throughout medical education reduces learners’ willingness to seek feedback, and encourages supervisors to mix up feedback with provision of ‘objective’ grades or pass/fail marks. This eye-opener article argues that the provision and reception of effective feedback by clinical supervisors and their learners is dependent on both parties’ awareness of the important distinction between feedback used in coaching towards growth and development (assessment for learning) and reaching a high-stakes judgement on the learner’s competence and fitness for practice (assessment of learning). Using driving lessons and the driving test as a metaphor for feedback and assessment helps supervisors and learners to understand this crucial difference and to act upon it. It is the supervisor’s responsibility to ensure that supervisor and learner achieve a clear mutual understanding of the purpose of each interaction (i.e. feedback or assessment). To allow supervisors to use the driving lesson—driving test metaphor for this purpose in their interactions with learners, it should be included in faculty development initiatives, along with a discussion of the key importance of separating feedback from assessment, to promote a feedback culture of growth and support programmatic assessment of competence.
Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation
Authors: Coelho Izabella F. , Barbosa Joseane R. , Liu Liying , Nogueira Cauê de S. C. , Franceschini Dante F. , Ponzio Eduardo A. , Silva Júlio César M. , Xing Yutao 
Published: September 2020

AbstractNickel nanoparticles supported by commercial carbon paper (CP) are prepared by pulsed laser deposition with deposition time of 3, 6, and 12 min as a catalyst for urea electro-oxidation. The surface conditions and the morphologies of the prepared electrodes have been characterized by Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. Urea electro-oxidation reaction in KOH solution on the Ni/CP electrodes is investigated by cyclic voltammetry and chronoamperometry. The results show that the electrode with less Ni nanoparticle agglomeration shows higher peak current density, which was achieved in the 3 min deposition samples when normalized by electroactive surface areas. However, the highest current normalized by the area of the carbon paper was achieved in the 6 min deposition sample due to the larger quantity of Ni nanoparticles. All the samples show good stability. Our results suggest that the low density, low cost, and environmental friendly CP can be used as support for Ni nanoparticle as a catalyst for urea electro-oxidation. It thus has great potential for many applications involving urea oxidation, such as wastewater treatments.
The Effects of Social Labels on the Allocation of Resources to Equivalent Stimuli: Does One Rotten Apple Spoil the Whole Barrel?
Authors: Keenan Mickey , Schenk Jacqueline , Coyle Caleb , Reid Lauren , Gallagher Stephen 
Published: September 2020

AbstractThe studies reported here examine how participants distribute resources to arbitrary stimuli in an equivalence class after one stimulus is given a social label. In Experiment 1, two 3-member equivalence classes were established with nonsense syllables (Class 1: A1 (ZID), B1 (YIM), C1 (FAP) and Class 2: A2 (VEK), B2 (RIX), C2 (KUD)) using matching-to-sample training. A social function was then assigned to B1 only, using the simple verbal statement "YIM is a Good person." Next, participants were instructed to allocate tokens to stimuli in whatever way they consider appropriate. In general, the percentage distribution of tokens allocated to Class 1 was greater than those allocated to Class 2. Participants were then informed that a mistake had been made “Sorry I have made a mistake. YIM was actually a bad person not a good person.” Participants were again asked to allocate tokens. In general, results showed a reduction in the distribution of tokens allocated to Class 1, with a relatively higher decrease for B1, and an increase in the distribution allocated to Class 2. Experiment 2 replicated Experiment 1 with the addition of a baseline assessment of token distribution prior to examining the effects of adding a social function to B1. During this baseline, the distribution of tokens was relatively similar across both classes. When social functions were added, marked differences occurred in the distribution depending on whether YIM was described as a “Good” or a “Bad” person. Results are discussed regarding transfer of function and its relevance to experimental social psychology.
Shifting social norms to reduce open defecation in rural India
Authors: GAURI VARUN , RAHMAN TASMIA , SEN IMAN K. 
Published: September 2020

AbstractToilet ownership in India has grown in recent years, but open defecation can persist even when rural households own latrines. There are at least two pathways through which social norms inhibit the use of toilets in rural India: (1) beliefs/expectations that others do not use toilets or latrines or find open defecation unacceptable; and (2) beliefs about ritual notions of purity that dissociate latrines from cleanliness. A survey in Uttar Pradesh, India, finds a positive correlation between latrine use and social norms at baseline. To confront these, an information campaign was piloted to test the effectiveness of rebranding latrine use and promoting positive social norms. The intervention targeted mental models by rebranding latrine use and associating it with cleanliness, and it made information about growing latrine use among latrine owners more salient. Following the intervention, open defecation practices went down across all treatment households, with the average latrine use score in treatment villages increasing by up to 11% relative to baseline. Large improvements were also observed in pro-latrine beliefs. This suggests that low-cost information campaigns can effectively improve pro-latrine beliefs and practices, as well as shift perceptions of why many people still find open defecation acceptable. Measuring social norms as described can help diagnose barriers to reducing open defecation, contribute to the quality of large-scale surveys and make development interventions more sustainable.
Fear of Contagion: One of the Most Devious Enemies to Fight During the COVID-19 Pandemic
Authors: Baldi Enrico , Savastano Simone 
Published: September 2020

ABSTRACTAn impressive reduction in emergency department patient attendance was observed during the coronavirus disease (COVID-19) pandemic coupled with an increase in the burden of patients with respiratory failure compared with the same period in 2019. These data are in line with the reduction in the hospital admissions rate for acute coronary syndrome observed during the COVID-19 outbreak, probably due to the patients’ fears of being infected during a hospital stay. All these factors may have contributed to the out-of-hospital cardiac arrest (OHCA) occurrence increase observed during the same period. The OHCAs rate increase can recognize 2 great sets of causes: the infection-related and the pandemic-related ones. If the first recognizes different underlying mechanisms that can be dealt with more and more effectively as evidence accumulates, we must remember also the latter: the fear of in-hospital contagion and the willingness not to further burden the health system, which can prevent some citizens from the activation of the emergency medical services (EMS) even in the case of symptoms suspected for time-dependent diseases, resulting in at-home deterioration until the OHCA occurrence. Information campaigns during pandemic must focus also on the importance of EMS early activation in case of real need to prevent COVID-19 from being a disease that kills at home.
Islam as a Civilizational Threat: Constitutional Identity, Militant Democracy, and Judicial Review in Western Europe
Authors: Hilal-Harvald Malthe 
Published: September 2020

AbstractMultiple laws and regulations in Western Europe have been enacted on the premise that headscarves and face veils constitute an existential threat to the constitutional identity of the respective legal systems. Thus, the logic of militant democracy as a justification for restricting fundamental rights have been applied in order to restrict the freedom to manifest one’s religion. Yet, the politicymakers claiming to defend the constitutional identity through militant democracy have not been able to prove the existence of a concrete, imminent threat against the state from the women who wear headscarves or face veils. Nonetheless, the European judiciaries have taken the political claim at face value and allowed the restrictions without compelling the political decision-makers to provide substantive justifications. Thus, the cases of headscarves and face veils offer a prism, through which we can study fundamental paradoxes of liberal democracy and constitutionalism.
Making Open Access Viable Economically
Authors: Hyde Andrew , Miller Russell A. , Towfigh Emanuel V. 
Published: September 2020

AbstractThe Editors-in-Chief have decided that we will provide our much-cherished readers with an editorial every so often as a way of sharing insights from the “machine room” where so much of the thinking and work is done to publish the German Law Journal. We want to let you in on the ideas that are on our minds, share with you our observations, and include you in the conversations we are having that might be of interest to you. We begin this tradition with this issue, Volume 21 – Number 6. Andrew Hyde, a member of the editorial team with which the Journal has partnered at Cambridge University Press, as well as Russell A. Miller and Emanuel V. Towfigh, two of the Journal’s co-Editors-in-Chief, open our From the Headquarters Essay with a piece on the Journal’s experiences with and its further plans for making open-access (OA) publishing economically viable. Related to that theme, we also want to share news with you about the introduction of a voluntary article processing charge this fall. Finally, we want to draw your attention to a videos and podcasts service we will start to produce to accompany the scholarship published in the Journal as a way of promoting our authors’ work and expanding access to their ideas. If you are interested only in these latter initiatives, you can also read the short section in the GLJ Instructions for Authors.
Neoproterozoic active margin in the northwestern Yangtze Block, South China: new clues from detrital zircon U–Pb geochronology and geochemistry of sedimentary rocks from the Hengdan Group
Authors: Hui Bo , Dong Yunpeng , Zhang Feifei , Sun Shengsi , He Shuai 
Published: September 2020

AbstractThe Yangtze Block in South China constitutes an important Precambrian landmass in the present East Asian continent. The Neoproterozoic sedimentary successions of the Hengdan Group in the NW Yangtze Block record essential information for deciphering the Neoproterozoic tectonics along the NW margin. However, its depositional age, provenance and tectonic properties remain uncertain. Here, a combined analysis of detrital zircon U–Pb dating and geochemistry is performed on representative samples from the Hengdan Group. Concordant dating results of samples from the bottom and upper parts constrain the maximum depositional age atc.720 Ma. Detrital zircon age patterns of samples reveal a uniformly pronounced age peak atc.915–720 Ma, which is consistent with the magmatic pulses in domains at the NW end of the Yangtze Block. In addition, these samples display left-sloping post-Archaean Australian shale (PAAS)-normalized rare-earth element patterns and variable trace element patterns, resembling sediments accumulated in a basin related to an active continental margin geodynamic setting. Provenance analysis reveals that the main sources featured intermediate to felsic components, which experienced rapid erosion and sedimentation. These integrated new investigations, along with previous compilations, indicate that the Hengdan Group might have been deposited in a fore-arc basin controlled by subduction beneath the Bikou Terrane. Thus, such interpretation further supports proposals for subduction-related tectonics along the western margin of the Yangtze Block during the early Neoproterozoic.
Perinatal anxiety and depressive symptoms and perception of child behavior and temperament in early motherhood
Authors: Miller Michelle L. , Williams Breanna M. , McCabe Jennifer E. , Williamson J. Austin , King Suzanne , Laplante David P. , Hart Kimberly J. , O’Hara Michael W. 
Published: September 2020

AbstractThe perinatal period is a vulnerable time for the development of psychopathology, particularly mood and anxiety disorders. In the study of maternal anxiety, important questions remain regarding the association between maternal anxiety symptoms and subsequent child outcomes. This study examined the association between depressive and anxiety symptoms, namely social anxiety, panic, and agoraphobia disorder symptoms during the perinatal period and maternal perception of child behavior, specifically different facets of development and temperament. Participants (N = 104) were recruited during pregnancy from a community sample. Participants completed clinician-administered and self-report measures of depressive and anxiety symptoms during the third trimester of pregnancy and at 16 months postpartum; child behavior and temperament outcomes were assessed at 16 months postpartum. Child development areas included gross and fine motor skills, language and problem-solving abilities, and personal/social skills. Child temperament domains included surgency, negative affectivity, and effortful control. Hierarchical multiple regression analyses demonstrated that elevated prenatal social anxiety symptoms significantly predicted more negative maternal report of child behavior across most measured domains. Elevated prenatal social anxiety and panic symptoms predicted more negative maternal report of child effortful control. Depressive and agoraphobia symptoms were not significant predictors of child outcomes. Elevated anxiety symptoms appear to have a distinct association with maternal report of child development and temperament. Considering the relative influence of anxiety symptoms, particularly social anxiety, on maternal report of child behavior and temperament can help to identify potential difficulties early on in mother–child interactions as well as inform interventions for women and their families.
The effects of different dietary fiber pectin structures on the gastrointestinal immune barrier: impact via gut microbiota and direct effects on immune cells
Authors: Beukema Martin , Faas Marijke M. , de Vos Paul 
Published: September 2020

AbstractPectins are dietary fibers with different structural characteristics. Specific pectin structures can influence the gastrointestinal immune barrier by directly interacting with immune cells or by impacting the intestinal microbiota. The impact of pectin strongly depends on the specific structural characteristics of pectin; for example, the degree of methyl-esterification, acetylation and rhamnogalacturonan I or rhamnogalacturonan II neutral side chains. Here, we review the interactions of specific pectin structures with the gastrointestinal immune barrier. The effects of pectin include strengthening the mucus layer, enhancing epithelial integrity, and activating or inhibiting dendritic cell and macrophage responses. The direct interaction of pectins with the gastrointestinal immune barrier may be governed through pattern recognition receptors, such as Toll-like receptors 2 and 4 or Galectin-3. In addition, specific pectins can stimulate the diversity and abundance of beneficial microbial communities. Furthermore, the gastrointestinal immune barrier may be enhanced by short-chain fatty acids. Moreover, pectins can enhance the intestinal immune barrier by favoring the adhesion of commensal bacteria and inhibiting the adhesion of pathogens to epithelial cells. Current data illustrate that pectin may be a powerful dietary fiber to manage and prevent several inflammatory conditions, but additional human studies with pectin molecules with well-defined structures are urgently needed.
Arthritis and the role of endogenous glucocorticoids
Authors: Macfarlane Eugenie , Seibel Markus J. , Zhou Hong 
Published: September 2020

AbstractRheumatoid arthritis and osteoarthritis, the most common forms of arthritis, are chronic, painful, and disabling conditions. Although both diseases differ in etiology, they manifest in progressive joint destruction characterized by pathological changes in the articular cartilage, bone, and synovium. While the potent anti-inflammatory properties of therapeutic (i.e., exogenous) glucocorticoids have been heavily researched and are widely used in clinical practice, the role of endogenous glucocorticoids in arthritis susceptibility and disease progression remains poorly understood. Current evidence from mouse models suggests that local endogenous glucocorticoid signaling is upregulated by the pro-inflammatory microenvironment in rheumatoid arthritis and by aging-related mechanisms in osteoarthritis. Furthermore, these models indicate that endogenous glucocorticoid signaling in macrophages, mast cells, and chondrocytes has anti-inflammatory effects, while signaling in fibroblast-like synoviocytes, myocytes, osteoblasts, and osteocytes has pro-inflammatory actions in rheumatoid arthritis. Conversely, in osteoarthritis, endogenous glucocorticoid signaling in both osteoblasts and chondrocytes has destructive actions. Together these studies provide insights into the role of endogenous glucocorticoids in the pathogenesis of both inflammatory and degenerative joint disease.