bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nonlinear stability and numerical simulations for a reaction–diffusion system modelling Allee effect on predators
Authors: Capone Florinda , Carfora Maria Francesca , De Luca Roberta , Torcicollo Isabella 
Published: August 2021

Abstract
A reaction–diffusion system governing the prey–predator interaction with Allee effect on the predators, already introduced by the authors in a previous work is reconsidered with the aim of showing destabilization mechanisms of the biologically meaning equilibrium and detecting some aspects for the eventual oscillatory pattern formation. Extensive numerical simulations, depicting such complex dynamics, are shown. In order to complete the stability analysis of the coexistence equilibrium, a nonlinear stability result is shown.
Positive radial solutions for Dirichlet problems involving the mean curvature operator in Minkowski space
Authors: He Zhiqian , Miao Liangying 
Published: August 2021

Abstract
In this paper, we study the number of classical positive radial solutions for Dirichlet problems of type
(P)

−
d
i
v

∇
u

1
−
|
∇
u

|

2

=
λ
f

(

u

)

in

B

1

,

u
=
0

on

∂

B

1

,

$$\left\{\begin{aligned}\hfill & -\mathrm{d}\mathrm{i}\mathrm{v}\left(\frac{\nabla u}{\sqrt{1-\vert \nabla u{\vert }^{2}}}\right)=\lambda f\left(u\right)\quad \text{in} {B}_{1},\hfill \\ \hfill & u=0\quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \text{on} \partial {B}_{1}, \hfill \end{aligned}\right.$$

where λ is a positive parameter,

B

1

=

{

x
∈

R

N

:
|
x
|
<
1

}

${B}_{1}=\left\{x\in {\mathbb{R}}^{N}:\vert x\vert {< }1\right\}$

, f : [0, ∞) → [0, ∞) is a continuous function. Using the fixed point index in a cone, we prove the results on both uniqueness and multiplicity of positive radial solutions of (P).
Tongue stretching: technique and clinical proposal
Authors: Buscemi Andrea , Coco Marinella , Rapisarda Alessandro , Frazzetto Giulia , Di Rosa Daniela , Feo Salvatore , Piluso Marta , Presente Lilia Paola , Campisi Santi Scirè , Desirò Paolo 
Published: August 2021

Abstract

Objectives
The tongue is an organ with multiple functions, from sucking to phonation, from swallowing to postural control and equilibrium. An incorrect position or mechanics of the tongue can causes sucking problems in the newborn or atypical swallowing in the adult, with repercussions on the position of the head and neck, up to influencing upright posture and other problems. Tongue dysfunctions are quite frequent (10–15%) in the population. For the manual therapist, this frequency indicates one to two subjects every 30 patients. Exercises have been proposed to improve the tone and strength of the swallowing muscles but the results are not so clear in the literature. The aim of this study is to describe and provide a tongue muscle normalization technique that helps the manual therapist in the treatment of problems related to it.

Methods
The literature has been investigated through pubmed, Google scholar of the last 10 years, the keywords used and combined with the Boolean operators AND and OR, are: “tongue, tongue habits, tongue diseases, taste disorder, neck pain, posture, postural balance, atypical swallowing, muscle stretching exercise, tissue expansion, soft tissue therapy, osteopathic manipulative treatment”.

Results and Conclusions
The technique is possible to be executed even in a sitting position, in the case the patient is unable to assume a supine position, the subject should provides immediate feedback that allows the therapist to understand if the technique has been correctly executed. The simplicity of execution and application of the technique makes it a possible and immediate therapeutic tool in the clinical setting.
Brandom and Quine on Perspectivally HybridDe ReAttitude Ascription: A Solution to a Problem in the Explanation of Action
Authors: Crawford Sean 
Published: August 2021

AbstractInMaking it ExplicitRobert Brandom claims that perspectivally hybridde reattitude ascriptions explain what an agent actually did, from the point of view of the ascriber, whether or not that was what the agent intended to do. There is a well-known problem, however, first brought to attention by Quine, but curiously ignored by Brandom, that threatens to undermine the role ofde reascriptions in the explanation of action, a problem that stems directly from the fact that, unlikede dictoascriptions, they permit the attribution of inconsistent attitudes to agents. I propose a solution to the problem which I believe is consistent with Brandom’s approach to the nature of intentionality and the explanation of action.
Flat morphological operators from non-increasing set operators, I: general theory
Authors: Ronse Christian 
Published: August 2021

Abstract
Flat morphology is a general method for obtaining increasing operators on grey-level or multivalued images from increasing operators on binary images (or sets). It relies on threshold stacking and superposition; equivalently, Boolean max and min operations are replaced by lattice-theoretical sup and inf operations.
In this paper we consider the construction a flat operator on grey-level or colour images from an operator on binary images that is not increasing. Here grey-level and colour images are functions from a space to an interval in ℝ
m
or ℤ
m
(m ≥ 1). Two approaches are proposed. First, we can replace threshold superposition by threshold summation. Next, we can decompose the non-increasing operator on binary images into a linear combination of increasing operators, then apply this linear combination to their flat extensions. Both methods require the operator to have bounded variation, and then both give the same result, which conforms to intuition. Our approach is very general, it can be applied to linear combinations of flat operators, or to linear convolution filters.
Our work is based on a mathematical theory of summation of real-valued functions of one variable ranging in a poset.
In a second paper, we will study some particular properties of non-increasing flat operators.
Estimating drift and minorization coefficients for Gibbs sampling algorithms
Authors: Spade David A. 
Published: August 2021

AbstractGibbs samplers are common Markov chain Monte Carlo (MCMC) algorithms that are used to sample from intractable probability distributions when sampling directly from full conditional distributions is possible. These types of MCMC algorithms come up frequently in many applications, and because of their popularity it is important to have a sense of how long it takes for the Gibbs sampler to become close to its stationary distribution. To this end, it is common to rely on the values of drift and minorization coefficients to bound the mixing time of the Gibbs sampler. This manuscript provides a computational method for estimating these coefficients. Herein, we detail the several advantages of the proposed methods, as well as the limitations of this approach. These limitations are primarily related to the “curse of dimensionality”, which for these methods is caused by necessary increases in the numbers of initial states from which chains need be run and the need for an exponentially increasing number of grid points for estimation of minorization coefficients.
Political Equality and Political Sufficiency
Authors: Blau Adrian 
Published: August 2021

AbstractThe distinction between equality and sufficiency, much discussed in the distributive justice literature, is here applied to democratic theory. Overlooking this distinction can have significant normative implications, undermining some defences and criticisms of political equality, as I show by discussing the work of three prominent democratic theorists: Thomas Christiano, David Estlund, and Mark Warren. Most importantly, Christiano sometimes defends egalitarian conclusions using sufficientarian premises, or worries about inequality in situations where insufficiency is also part of the problem; inequality above the level of sufficiency is not always as troubling. Estlund makes the reverse error. He attacks rather than defends political egalitarianism, but insufficiency seems to explain some of his concerns. Nonetheless, I show that political egalitarians may need to specify a sufficientarian threshold, to avoid levelling-down objections. Democratic theorists should thus take seriously the distinction between political equality and political sufficiency. More generally, political theorists and philosophers should be aware of omitted variable bias and interaction effects due to conceptual stretching arising from under-theorised distinctions in their thought experiments.
Single-nanoantenna driven nanoscale control of the VO2 insulator to metal transition
Authors: Bergamini Luca , Chen Bigeng , Traviss Daniel , Wang Yudong , de Groot Cornelis H. , Gaskell Jeffrey M. , Sheel David W. , Zabala Nerea , Aizpurua Javier , Muskens Otto L. 
Published: August 2021

Abstract
The ultrafast concentration of electromagnetic energy in nanoscale volumes is one of the key features of optical nanoantennas illuminated at their surface plasmon resonances. Here, we drive the insulator to metal phase transition in vanadium dioxide (VO2) using a laser-induced pumping effect obtained by positioning a single gold nanoantenna in proximity to a VO2 thermochromic material. We explore how the geometry of the single nanoantenna affects the size and permittivity of the nanometer-scale VO2 regions featuring phase transition under different pumping conditions. The results reveal that a higher VO2 phase transition effect is obtained for pumping of the longitudinal or transversal localized surface plasmon depending on the antenna length. This characterization is of paramount importance since the single nanoantennas are the building blocks of many plasmonic nanosystems. Finally, we demonstrate the picosecond dynamics of the VO2 phase transition characterizing this system, useful for the realization of fast nano-switches. Our work shows that it is possible to miniaturize the hybrid plasmonic-VO2 system down to the single-antenna level, still maintaining a controllable behavior, fast picosecond dynamics, and the features characterizing its optical and thermal response.
Crystal structure of 2,2′-(butane-1,4-diylbis(azanylylidene))bis(methanylylidene))bis(4-methoxyphenol), C20H24N2O4
Authors: Orang’o Daniel M. , Onani Martin O. , Tarus Paul K. , Lutta Samuel T. , Lalancette Roger A. 
Published: August 2021

Abstract
C20H24N2O4, monoclinic, P21/n (no. 14), a = 11.0474(3) Å, b = 6.0853(2) Å, c = 13.9881(4) Å, β = 104.271(2)°, V = 911.36(5) Å3, Z = 2, R

gt
(F) = 0.0290, wR

ref
(F
2) = 0.0728, T = 100(2) K.
Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)
Authors: Hibbert David Brynn , Korte Ernst-Heiner , Örnemark Ulf 
Published: August 2021

Abstract
Recommendations are given for metrological terminology in analytical chemistry. Analytical chemistry is defined, and concepts related to laboratory practice are termed and defined. Recommendations are given concerning the terminology of quality assurance in analytical chemistry. Terms draw on the extensive quality literature, particularly from ISO.
Experimental study on mechanical properties and microstructures of steel fiber-reinforced fly ash-metakaolin geopolymer-recycled concrete
Authors: Xu Zhong , Huang Zhenpu , Liu Changjiang , Deng Xiaowei , Hui David , Deng Yuting , Zhao Min , Qin Libing 
Published: August 2021

Abstract
Geopolymer cementitious materials and recycled aggregate are typical representatives of material innovation research in the engineering field. In this study, we experimentally investigated a method to improve the performance of geopolymer-recycled aggregate concrete (GRAC). The recycled concrete aggregates and steel fiber (SF), fly ash (FA), metakaolin (MK), and sodium silicate solution were used as the main raw materials to prepare fiber-reinforced geopolymer-recycled aggregate concrete (FRGRAC). First, the orthogonal test was carried out to study the GRAC, and the optimal mix proportion was found. Second, building on the optimal mix proportion, the effects of the SF content on the slump, 7 and 28 days compressive strength, tensile strength, and flexural strength of FRGRAC were further studied. Finally, the microscopic mechanism of FRGRAC was studied by scanning electron microscopy (SEM). The study results indicate that the slump continues to decrease as the fiber content increases, but the compressive strength, tensile strength, and flexural strength increase to a certain extent. Through SEM analysis, it is found that SF restrains the development of cracks and improves the strength of concrete.
Post-stroke recrudescence—a possible connection to autoimmunity?
Authors: Akamatsu Yosuke , Chaitin Hersh J. , Hanafy Khalid A. 
Published: August 2021

Abstract
Early recanalization of the occluded vessel is the only efficient intervention that improves outcome after ischemic stroke. In contrast, interventions for chronic issues facing stroke patients are limited. Recent clinical and preclinical studies have shown a correlation between upregulated immune responses to brain antigens and post-stroke recrudescence (PSR), post-stroke fatigue (PSF), and dementia (PSD); all of which are associated with poor long-term stroke outcome. Recent retrospective studies have demonstrated a strong correlation between the onset of PSR and acute infection during acute stroke, suggesting some adaptive immune system mediated pathology. This review will discuss the mechanisms and epidemiology of PSR based on the current clinical and pre-clinical evidence. Accordingly, PSR does appear correlated with populations that are prone to autoimmunity, infection, and subsequent triggers, which corroborate autoimmune responses to self-brain antigens as an underlying mechanism. Moreover, PSR as well as PSF and PSD seem to be partly explained by the development of a neuro-inflammatory response to brain antigens. Therefore, the future of improving long-term stroke outcome could be bright with more accurate pre-clinical models focusing on the role of adaptive immune-mediated post stroke neuroinflammation and more clinical studies of PSR.
On recurrent properties of Fisher--Wright's diffusion on (0,1) with mutation
Authors: Sineokiy Roman , Veretennikov Alexander 
Published: August 2021

Abstract
A one-dimensional Fisher–Wright diffusion process on the interval

(
0
,
1
)

{(0,1)}

with mutations is considered. This is a widely known model in population genetics. The goal of this paper is an exponential recurrence of the process, which also implies an exponential rate of convergence towards the invariant measure.
Bühler’s organon model of communication: a semiotic analysis of advertising slogans
Authors: Safavi Sarvenaz 
Published: August 2021

Abstract
This article investigates the member units of sign systems used in contemporary Iranian advertising slogans according to the Organon Model introduced by Karl Bühler. In dealing with this subject, the writer introduces Bühler’s Organon Model and provides a short definition of the term advertising slogan. The next part of this article shows the three types of conative functions with regard to such slogans. The corpus of this study is the slogan of a hundred contemporary Iranian advertising messages used in Iranian markets which have not been studied from a semiotic perspective. The result of this research shows the tendencies of Iranian advertising messages to lean towards the descriptive type of conative function.
Pain and executive function: no association between remote exercise-induced hypoalgesia and cognitive inhibition in pain-free participants
Authors: Gajsar Hannah , Meyer Marcel , Hasenbring Monika I. , Vaegter Henrik B. 
Published: August 2021

Abstract

Objectives
Cognitive inhibition, which denotes the ability to suppress predominant or automatic responses, has been associated with lower pain sensitivity and larger conditioned pain modulation in humans. Studies exploring the association between cognitive inhibition and other pain inhibitory phenomena, like exercise-induced hypoalgesia (EIH), are scarce. The primary aim was to explore the association between cognitive inhibition and EIH at exercising (local) and non-exercising (remote) muscles after isometric exercise. The secondary aim was to explore the association between cognitive inhibition and pressure pain sensitivity.

Methods
Sixty-six pain-free participants (28.3 ± 8.9 years old, 34 women) completed two cognitive inhibition tasks (stop-signal task and Stroop Colour-Word task), a 3-min isometric wall squat exercise, and a quiet rest control condition with pre- and post-assessments of manual pressure pain thresholds at a local (thigh) and a remote site (shoulder). In addition, cuff pressure pain thresholds, pain tolerance and temporal summation of pain were assessed at baseline.

Results
No association was found between remote EIH and cognitive inhibition (Stroop interference score: r=0.12, [−0.15; 0.37], p=0.405, BF01=6.70; stop-signal reaction time: r=−0.08, [−0.32; 0.17], p=0.524, BF01=8.32). Unexpectedly, individuals with worse performance on the Stroop task, as indicated by a higher Stroop interference score, showed higher local EIH (r=0.33; [0.10; 0.53], p=0.007, BF01=0.29). No associations were observed between pain sensitivity and any of the cognitive inhibition performance parameters.

Conclusions
The present findings do not support previous evidence on positive associations between exercise-induced hypoalgesia and cognitive inhibition, as well as baseline pain sensitivity and cognitive inhibition.
Zur Funktion der Stimme in Psychotherapie und Liturgie-Annäherungen
Authors: Lewandowski Ludwig 
Published: August 2021

ZusammenfassungEs wird die Bedeutung der Stimme für den psychotherapeutischen und liturgischen Erfahrungsraum aufgezeigt. In ihrer prosodisch-semantischen Bandbreite fungiert die menschliche Stimme zum An- und Herbeirufen des Anderen und ermöglicht/verhindert Beziehung und Kontakt. Säkulare wie spirituelle Beziehungserfahrungen werden erleichtert, wenn dasWieder Stimme zu einer Passung mit den Beziehungserwartungen des Patienten/des Gottesdienstbesuchers beiträgt. Im taktvollen, prosodisch stimmigen Wechselspiel von Reden und Schweigen, das ein Gefühl persönlichen Angesprochenseins hinterlässt, werden säkulare wie spirituelle Beziehungserfahrungen ermöglicht und im günstigen Fall auch geheilt.
A (4,4)-connected zinc(II) coordination polymer constructed with the flexible 2-carboxy phenoxyacetate ligand: synthesis, conformation alteration and fluorescent properties
Authors: Li Jun-Xia , Zhang Tian , Chen He-Jun , Du Zhong-Xiang 
Published: August 2021

Abstract
A new binary ZnII coordination polymer, [Zn(2-cpa)(H2O)]
n
(2D-Zn) has been prepared by a 120 °C hydrothermal reaction of zinc(II) sulfate heptahydrate and 2-carboxy phenoxyacetic acid (2-H2cpa) in the presence of potassium hydroxide. Single-crystal X-ray diffraction analysis shows that the ZnII ion is located in a deformed ZnO6 octahedron bonded by one water and three 2-carboxy phenoxyacetate (2-cpa) ligands. The 2-cpa exhibits pentadentate double bridging chelate-μ
3 coordination mode and connects adjacent ZnII ions to generate a corrugated (4,4)-connected layer structure. The structures, conformation of 2-cpa and photoluminescence spectra for 2D-Zn have been carefully analyzed and compared with its two closely related compounds ̶ 1D [Zn(2-cpa)(H2O)]
n
(1D-Zn) and mononuclear [Zn(2-cpa)(H2O)3] (0D-Zn). The results showed that the conformation of 2-cpa in 2D-Zn has the maximum alteration and the corresponding fluorescence emission peak of 2D-Zn has the largest red-shift of 62 nm compared with that of free 2-H2cpa.
Feasibility Study of Locally Excavated Soil in Foamed Cement Mixture as Backfill Material for Abutments of Railway Bridges
Authors: Minh Le Tri Ho , Lee Tack-Woo , Seo Jung-Woo , Park Dae-Wook 
Published: August 2021

Abstract
The varying stiffness of materials surrounding a railway bridge abutment section has caused concern for rapid deterioration. Particularly on the transition toward the bridge approach, a significant contributing factor to the bad experience is the consolidation of the backfill material used. The objective of this study is to conduct experimental research utilizing locally available soil in a lightweight foamed concrete mixture as an alternative sustainable solution. The new technique combines the merits of the self-leveling air foam and the early strength attainment of portland cement concatenate into a flowable soil mixture. To attain this objective, the properties of the flowable soil mixture are tested by using various laboratory experiments. Furthermore, a numerical simulation was utilized to evaluate the performance of the backfill material under cyclic train loads compared with the conventional cement-treated base. The test results suggested that air foam content noticeably improves the self-leveling of backfill material, however, it should be controlled at lower than 20 % to ensure sufficient strength gain. Adding more cement content and lowering the usage of air foam not only shortens the setting time to less than 12 h and enhances the compressive strength up to 1.45 MPa, but it also reinforces the frost resistance of the lightweight foamed soil mixture. In addition to the numerical simulation, the test results reveal that the new material provides great settlement resistance and can withstand vibration load for a railway track system. The elastic displacement can be reduced up to 21 % (2 mm), and the plastic settlement can be lower to more than 60 % (6 mm) under 10,000 cyclic loads. In general, the application of lightweight foamed soil mixture as a backfill material for railway bridge approach poses a green and sustainable alternative solution.
The Effect of Nanocoatings on Critical Heat Flux (CHF) under Pool Boiling Conditions
Authors: Reddy Sadhgun , Narayan Prabhu K. , Vignesh Nayak U. 
Published: August 2021

Abstract
The effect of nanomaterial coating on heat transfer characteristics of a copper substrate during pool boiling with distilled water (&gt;99.9 %) was studied. The peak on the pool boiling curve between nucleate and transition boiling is termed the critical heat flux. Multi-walled carbon nanotubes and graphene were used to obtain coatings on the copper substrate. Experiments were carried out at atmospheric pressure. The results showed enhanced critical heat flux for the coated substrates. Graphene-coated copper showed the highest critical heat transfer characteristics compared with that on bare and multi-walled carbon nanotube-coated substrates. The study has significant implications for the enhancement of heat transfer during quench heat treatment.
LOCALIZACIÓN DE ÁRBOLES DE CHIRRACA (MYROXYLON PERUIFERUM, FABACEAE) EN SAN RAMÓN DE ALAJUELA A PARTIR DE LA NOVELA JUAN VARELA
Authors: Aguilar-Sandí Diego 
Published: August 2021

Recibido: 22-02-2020
Aprobado: 27-03-2020
RESUMEN
La presencia en Costa Rica de árboles de la especie Myroxylon peruiferum (Fabaceae), conocidos como chirracos o chirracas, se confirmó en el año 2019 con base en recolectas botánicas realizadas en los cantones de Acosta, Mora y Santa Ana. Hasta entonces, no había evidencia de su presencia en San Ramón de Alajuela. En noviembre de 2019 y enero de 2020, se hicieron dos recolectas de esta especie en la cuenca del río Barranca en San Ramón que fueron depositadas en el Herbario Luis A. Fournier Origgi (USJ) de la Universidad de Costa Rica. El objetivo de este artículo es evidenciar cómo a partir de la lectura de la novela Juan Varela, escrita por Adolfo Herrera García y publicada en 1939, se lograron ubicar esos árboles. Esta investigación estuvo orientada por la pregunta ¿puede una obra literaria servir de insumo para emprender una expedición botánica que permita ubicar una especie en un sitio determinado? Respuesta que resultó afirmativa en el caso que aquí se trata.