bluuebunny/crossref_metadata_2025_split huggingface dataset:
COVID-19 Pandemic: Perspective From Italian Pediatric Emergency Physicians
Authors: Monzani Alice , Ragazzoni Luca , Della Corte Francesco , Rabbone Ivana , Franc Jeffrey M. 
Published: June 2020

ABSTRACTObjectives:To document the lived experience of Italian pediatric emergency physicians during the coronavirus disease 2019 (COVID-19) pandemic.Methods:We developed a structured interview to collect the lived experience of the staff of the pediatric emergency department (PED) of a tertiary referral university hospital in Northern Italy. The open-ended questions were draft according to the suggestions of Canadian colleagues and administered by 1 interviewer, who was part of the PED staff, at the end of March 2020. All the PED staff was interviewed, on a voluntary basis, using purposive sampling.Results:Most respondents declared to be afraid of becoming infected and of infecting their families. The number of patients seen in the PED has decreased, and the cases tend to be more severe. A shift in the clinical approach to the ill child has occurred, the physical examination is problem-oriented, aiming to avoid un-necessary maneuvers and to minimize the number of practitioners involved. The most challenging aspects reported are: (1) performing a physical examination in personal protective equipment (PPE), (2) being updated with rapidly evolving guidelines, and (3) staying focused on the possible COVID-19 clinical presentation without failing in differential diagnosis.Conclusions:During the COVID-19 pandemic, it seems that pediatric emergency physicians are radically changing their clinical practice, aiming at prioritizing essential interventions and maneuvers and self-protection.
HOMOGENEOUS STRUCTURES WITH NONUNIVERSAL AUTOMORPHISM GROUPS
Authors: KUBIŚ WIESŁAW , SHELAH SAHARON 
Published: June 2020

AbstractWe present three examples of countable homogeneous structures (also called Fraïssé limits) whose automorphism groups are not universal, namely, fail to contain isomorphic copies of all automorphism groups of their substructures.Our first example is a particular case of a rather general construction on Fraïssé classes, which we call diversification, leading to automorphism groups containing copies of all finite groups. Our second example is a special case of another general construction on Fraïssé classes, the mixed sums, leading to a Fraïssé class with all finite symmetric groups appearing as automorphism groups and at the same time with a torsion-free automorphism group of its Fraïssé limit. Our last example is a Fraïssé class of finite models with arbitrarily large finite abelian automorphism groups, such that the automorphism group of its Fraïssé limit is again torsion-free.
Twisted Alexander ideals and the isomorphism problem for a family of parafree groups
Authors: Hung Do Viet , Khoi Vu The 
Published: June 2020

AbstractIn 1969, Baumslag introduced a family of parafree groups Gi,j which share many properties with the free group of rank 2. The isomorphism problem for the family Gi,j is known to be difficult; a few small partial results have been found so far. In this paper, we compute the twisted Alexander ideals of the groups Gi,j associated with non-abelian representations into $SL(2,{\mathbb Z}_2)$. Using the twisted Alexander ideals, we prove that several pairs of groups among Gi,j are not isomorphic. As a consequence, we solve the isomorphism problem for sub-families containing infinitely many groups Gi,j.
Confined molecules: experiment meets theory in small spaces
Authors: Yu Yang , Rebek Julius 
Published: June 2020

AbstractThe behavior of molecules confined to small spaces is fascinating chemistry and lies at the heart of signaling processes in biology. Our approach to confinement is through reversible encapsulation of small molecules in synthetic containers. We show that confinement leads to amplified reactivities in bimolecular reactions, stabilization of otherwise reactive species, and limitation in motions that create new stereochemical arrangements. The isolation of molecules from solvent makes for manageable computations and has stimulated theorist to examine reaction details in the limited space. Transition states for reactions and rearrangements can be calculated, the effects of (de)solvation can be evaluated and the magnetic properties of the containers can be compared with experimental observations. Finally, we outline several potential applications, including entanglement chemistry and the use of isomers in data storage.
Exploring older adults’ experiences seeking psychological services using the network episode model
Authors: Beatie Brooke E. , Mackenzie Corey S. , Thompson Genevieve , Koven Lesley , Eschenwecker Tyler , Walker John R. 
Published: June 2020

AbstractOlder adults’ mental health problems are a growing public health concern, especially because their rate of mental health service use is particularly low. Decades of mental health service utilisation models have been developed, yet key assumptions from these models focus primarily on factors that facilitate or inhibit access into the treatment system without taking into considering the dynamics of how individuals respond to their mental health problems and engage in service utilisation. More recently, dynamic models like the Network Episode Model (NEM-II) have been developed to challenge the underlying, rational choice assumption of traditional utilisation models. Given the multifaceted and complex nature of older adults’ mental health problems, the objective of this study was to examine whether the NEM-II is a helpful and appropriate model for understanding the dynamic process of how older adults navigate the mental health system, including factors that advanced and delayed help-seeking. Our qualitative analyses from 15 interviews with older adults revealed that their backgrounds, social supports and treatment systems influence, and are influenced by, their illness careers. Factors that delayed help-seeking included: a lack of support, ‘inappropriate’ referrals/advice from treatment professionals and poor mental health literacy. This research suggests the NEM-II is a helpful and appropriate theory for understanding older adults’ pathways to treatment, and has implications to enhance older adults’ access to psychological services.
A New Sensor for Robotic Mars Rovers in Sandy Terrains Predicting Critical Soil Flow Using the Spiral Soil Flow Model
Authors: Ebrahimi Saeed , Mardani Arman , Alipour Khalil 
Published: June 2020

SUMMARYThe current contribution presents a new sinkage sensor specified for an unmanned ground vehicle to find the exact sinkage zone of a wheel interacting with the soil particles. This sensor will be wrapped around the wheel, and consequently, contact analog outputs will be used in soil deposition and bulldozing effect prediction. Furthermore, the new sensor will be used for a novel soil flow calculation estimating the total mass variation of the control volume of soil particles beneath the wheel. Accordingly, the spiral model simulating the displacement of the particle is implemented to calculate the soil deposition.
Adaptive Robust Tracker Design for Nonlinear Sandwich Systems Subject to Saturation Nonlinearities
Authors: Azhdari Meysam , Binazadeh Tahereh 
Published: June 2020

SUMMARYThis paper addresses the tracking problem for uncertain nonlinear sandwich systems that consist of two nonlinear subsystems and saturation nonlinearity, which is sandwiched between the subsystems. The considered sandwich system is also subject to a nonsymmetric input saturation constraint. Due to the nonsmooth characteristics of sandwiched saturation nonlinearity and also the input saturation function, the design procedure deals with hard challenges. To overcome these difficulties, a recursive approach is suggested that consists of two phases. For the implementation of the proposed approach, a tracking problem is solved in each phase. In the first phase, the second subsystem with sandwiched saturation nonlinearity is considered and the output tracking problem of the desired time-varying reference signal is solved using backstepping method. The outcome of the first phase is the desired reference signal that should be tracked by the first subsystem in the next phase. In the second phase, the robust control input is designed for the first subsystem by employing adaptive sliding mode technique such that, despite the nonsymmetric input saturation constraint, model uncertainty and external disturbances, the output of the first subsystem follows the desired signal that is obtained in the previous phase. The simulation results for a mechanical sandwich system are illustrated to verify the effectiveness of the proposed control method.
Aboriginal Cultural Heritage Reform in Australia and the Dilemmas of Power
Authors: Butterly Lauren , Lixinski Lucas 
Published: June 2020

AbstractThe last decade or so has seen a fundamental shift in Aboriginal cultural heritage law in Australia. A number of subnational jurisdictions in Australia have undergone major reforms to their Aboriginal heritage legislation. Other subnational jurisdictions are currently in the reform process or have promised reform in coming years. We use the latest (and, at the time of writing, ongoing) process to reform Aboriginal heritage legislation in the state of New South Wales (NSW) to explore some of the legal issues and themes emanating from the Australian experience. The NSW example is a useful case study for thinking about how minority heritage regulation can not only serve broader social movements but also undercut some of its own possibilities. We argue that even law that is ostensibly in place to promote the control of communities over their own heritage can cause difficult balancing acts that may default to a dependency path and effectively detract from its own projected goals.
THE PARADOX OF ENRICHMENT, SPATIAL HETEROGENEITY, COMMUNITY EFFECTS AND THE PHENOMENON OF APPARENT DISAPPEARANCE IN THE MARINE BACTERIOPHAGE DYNAMICS
Authors: KOROBEINIKOV ANDREI , SHCHEPAKINA ELENA , SOBOLEV VLADIMIR 
Published: June 2020

AbstractIn aquatic microbial systems, high-magnitude variations in abundance, such as sudden blooms alternating with comparatively long periods of very low abundance (“apparent disappearance”), are relatively common. We suggest that in order for this to occur, such variations in abundance in microbial systems and, in particular, the apparent disappearance of species do not require seasonal or periodic forcing of any kind or external factors of any other nature. Instead, such variations can be caused by internal factors and, in particular, by bacteria–phage interaction. Specifically, we suggest that the variations in abundance and the apparent disappearance phenomenon can be a result of phage infection and the lysis of infected bacteria. To illustrate this idea, we consider a reasonably simple mathematical model of bacteria–phage interaction based on the model suggested by Beretta and Kuang, which assumes neither periodic forcing nor action of other external factors. The model admits a loss of stability via Andronov–Hopf bifurcation and exhibits dynamics which explains the phenomenon. These properties of the model are especially distinctive for spatially nonhomogeneous biosystems as well as biosystems with some sort of cooperation or community effects.
THE MAGNETIC FIELD ABOUT A THREE-DIMENSIONAL BLOCK NEODYMIUM MAGNET
Authors: WEIR GRAHAM , CHISHOLM GEORGE , LEVENEUR JEROME 
Published: June 2020

AbstractNeodymium magnets were independently discovered in 1984 by General Motors and Sumitomo. Today, they are the strongest type of permanent magnets commercially available. They are the most widely used industrial magnets with many applications, including in hard disk drives, cordless tools and magnetic fasteners. We use a vector potential approach, rather than the more usual magnetic potential approach, to derive the three-dimensional (3D) magnetic field for a neodymium magnet, assuming an idealized block geometry and uniform magnetization. For each field or observation point, the 3D solution involves 24 nondimensional quantities, arising from the eight vertex positions of the magnet and the three components of the magnetic field. The only unknown in the model is the value of magnetization, with all other model quantities defined in terms of field position and magnet location. The longitudinal magnetic field component in the direction of magnetization is bounded everywhere, but discontinuous across the magnet faces parallel to the magnetization direction. The transverse magnetic fields are logarithmically unbounded on approaching a vertex of the magnet.
SECOND ORDER SUBEXPONENTIALITY AND INFINITE DIVISIBILITY
Authors: WATANABE TOSHIRO 
Published: June 2020

AbstractWe characterize the second order subexponentiality of an infinitely divisible distribution on the real line under an exponential moment assumption. We investigate the asymptotic behaviour of the difference between the tails of an infinitely divisible distribution and its Lévy measure. Moreover, we study the second order asymptotic behaviour of the tail of the $t$th convolution power of an infinitely divisible distribution. The density version for a self-decomposable distribution on the real line without an exponential moment assumption is also given. Finally, the regularly varying case for a self-decomposable distribution on the half line is discussed.
GLOBAL SUBELLIPTIC ESTIMATES FOR KRAMERS–FOKKER–PLANCK OPERATORS WITH SOME CLASS OF POLYNOMIALS
Authors: Ben Said Mona 
Published: June 2020

AbstractIn this article, we study some Kramers–Fokker–Planck operators with a polynomial potential $V(q)$ of degree greater than two having quadratic limiting behaviour. This work provides an accurate global subelliptic estimate for Kramers–Fokker–Planck operators under some conditions imposed on the potential.
Psychometric properties of the Korean version of the positive aspects of caregiving scale for family caregivers of people with amyotrophic lateral sclerosis
Authors: Chu Hyeon Sik , Tak Young Ran 
Published: June 2020

AbstractObjectiveMany caregivers report finding positive meanings in their caregiving roles and activities. The positive aspects of caregiving (PAC) scale was designed to measure positive appraisals of caregiving. This study assessed the reliability and validity of the Korean version of the PAC for family caregivers of people with amyotrophic lateral sclerosis (ALS).MethodThe instrument's content and semantic equivalence were established using translation and back translation of the PAC. A convenience sample of 127 family caregivers of patients with ALS in Korea was recruited. Content, construct, and convergent validity of the Korean PAC were evaluated. Cronbach's α was used to assess reliability. This study used secondary data; the primary study received approval from the Institutional Review Board of H Hospital, from where data were collected. The consent forms did not mention the future use of data. Therefore, we have applied for approval regarding this study's protocol and exemption from informed consent.ResultsThe Cronbach's α was 0.92, and internal consistency was acceptable. Exploratory factor analysis supported the construct validity with a two-factor solution explaining 74.73% of the total variance. Regarding convergent validity, the Korean PAC score negatively correlated with caregiver burden and depression and positively with self-rated health status. We were unable to evaluate the suitability of the suggested structural dimensionality through confirmatory factor analysis. Furthermore, as we used secondary data, we could not assess retest reliability for the evaluation of the scale's stability.Significance of resultsThe Korean PAC was found to be an applicable instrument with satisfactory reliability and validity and suitable for further use as a measure for positive appraisals of caregiving for family caregivers of people with ALS. It may be effective for measuring caregivers’ psychological resources.
Population structure, marker-trait association and identification of candidate genes for terminal heat stress relevant traits in bread wheat (Triticum aestivum L. em Thell)
Authors: Sharma Devender , Jaiswal Jai Prakash , Gahtyari Navin Chander , Chauhan Anjana , Chhabra Rashmi , Saripalli Gautam , Singh Narendra Kumar 
Published: June 2020

AbstractGenetic improvement along with widened crop base necessitates for the detailed understanding of the genetic diversity and population structure in wheat. The present investigation reports the discovery of a total of 182 alleles by assaying 52 simple sequence repeats (SSRs) on 40 genotypes of bread wheat. Unweighted neighbour-joining method grouped these genotypes into two main clusters. Highly heat tolerant and intermediate tolerant cultivars were grouped in the same cluster, whereas remaining genotypes, particularly sensitive ones, were assigned different cluster. Similarly, the entire population was structured into two sub-populations (K = 2), closely corresponding with the other distance-based clustering patterns. The marker-trait association was discovered for four important physiological parameters, viz. canopy temperature depression, membrane thermostability index (MSI), normalized difference vegetation index and heat susceptibility index, indicating for heat stress (HS) tolerance in wheat. Both general and mixed linear models of association studies during 2017 and 2018, revealed the association of SSR markers, wmc222 (17.60%, PV) and gwm34 (20.70%, PV) with the mean phenotypic value of MSI. Likewise, SSR markers barc183, gwm75, gwm11 and cfd7 revealed a unique relationship with four selected physiological traits. Candidate genes discovered using in silico tools had nine SSR markers within the genic regions reported to play a role in heat and drought stress responses in plants. The information generated about these genic regions may be explored further in expression studies in-vivo to impart HS tolerance in bread wheat.
Erfassung von Einstellungen zu Inklusion mit SACIE, EFI-L und KIESEL
Authors: Gorges Julia , Grumbach Jasmin , Micheel Sabrina A. , Neumann Phillip 
Published: June 2020

Zusammenfassung. Positive Einstellungen zu Inklusion gelten als zentraler Erfolgsfaktor für die Entwicklung eines inklusiven Schulsystems. Die vorliegende Studie prüft die Validität dreier gängiger deutschsprachiger Messinstrumente zur Erfassung von Einstellungen zu Inklusion in einer unabhängigen Stichprobe: SACIE, EFI-L und KIESEL. Zur Validierung herangezogene externe Konstrukte sind Selbstwirksamkeit und die Big Five Persönlichkeitsfaktoren. Die Ergebnisse einer Befragung von 556 Lehrkräften und Lehramtsstudierenden (Alter: M‍( SD) = 26.48 (12.67); 70 % weiblich) mit Blick auf die Inklusion von Kindern mit Förderschwerpunkt Lernen (SPF-L) zeigen eine weitgehend gute Replizierbarkeit der Faktorstrukturen der Instrumente. Die Faktorkorrelationen über die Instrumente hinweg lagen zwischen |.61| und |.96| (nur Attitude Subskala des SACIE). Alle Subskalen zeigen vergleichbare Zusammenhänge mit Selbstwirksamkeit und den Big Five Persönlichkeitsfaktoren. Zwar weisen Unterschiede in den Effektstärken darauf hin, dass die Instrumente je spezifische Aspekte von Inklusion betonen, insgesamt rechtfertigen die Ergebnisse jedoch die Annahme, dass das zugrundeliegende Konzept von Einstellungen bezüglich Inklusion weitgehend überlappt.
Analytical Solution of Suspended Sediment Concentration Profile: Relevance of Dispersive Flow Term in Vegetated Channels
Authors: Huai Wenxin , Yang Liu , Guo Yakun 
Published: June 2020

AbstractSimulation of suspended sediment concentration (SSC) has great significance in predicting the sediment transport rate, vegetation growth, and the river ecosystem in channels. The present study focuses on investigating the vertical SSC profile in the vegetated open channel flows. To this end, a model of the dispersive flux is proposed in which the dispersive coefficient is expressed as partitioned linear profile above or below the half height of vegetation. The double‐averaging method, that is, time‐spatial average, is applied to investigate the vertical SSC profile in the vegetated open channel flows. The analytical solution of SSC in both submerged and emergent vegetated open channel flows is obtained by solving the vertical double‐averaging sediment advection‐diffusion equation. The morphological coefficient, a key factor of dispersive coefficient, is obtained by fitting the existing experimental data. The analytically predicted SSC agrees well with the experimental measurements, indicating that the proposed model can be used to accurately predict the SSC in the vegetated open channel flows. Results show that the dispersive term can be ignored in the region without vegetation, while the dispersive term has significant effect on the vertical SSC profile within the region of vegetation. The present study demonstrates that the dispersive coefficient is closely related to vegetation density, vegetation structure, and stem Reynolds number but has little relation with flow depth. With a few exceptions, the absolute value of the dispersive coefficient decreases with the increase of vegetation density and increases with the increase of stem Reynolds number in the submerged vegetated open channels.
Elastic Properties and Seismic Anisotropy Across the Alpine Fault, New Zealand
Authors: Jeppson T. N. , Tobin H. J. 
Published: June 2020

AbstractSeismically detected low‐velocity zones are commonly associated with major crustal faults. In order to accurately interpret these low‐velocity zones and understand processes that produce them, direct measurements of seismic wave speed through fault zone rocks are needed. The Alpine Fault dominates the active transpressional plate boundary of the South Island, New Zealand. We examine heterogeneity by determining elastic properties of the Alpine Fault using Deep Fault Drilling Project (DFDP)‐1 drill core and borehole logs, and outcrop samples from central Alpine Fault field localities. We measured P and S wave velocities on saturated rock samples, in three orthogonal directions, over a range of effective pressures. P and S wave velocities in fault rock range from 2.5 to 5.0 km/s and 1.3 to 2.7 km/s, respectively, consistent with the borehole sonic log. These velocities are slower than those in the surrounding host rock corresponding to a 20% to 40% decrease in velocity, caused by mechanical and chemical alteration processes, extending at least 30 m from the principal slip surface. Hanging wall host rocks are strongly anisotropic, while brittle fault rock and footwall host rock are mostly isotropic. Fault zone trapped wave observations are geometrically and quantitatively consistent with field observations and laboratory measurements of the damage zone. Scale independence of the velocity measurement in this zone across core, log, and field scales shows that drill core and outcrop samples are good proxies for in situ rocks, suggesting that the low velocity is due to microscale features, such as microfractures and clay content.