bluuebunny/crossref_metadata_2025_split huggingface dataset:
How firm size moderates the knowledge and affects the innovation performance? Evidence from Brazilian manufacturing firms
Authors: Viglioni Marco Túlio Dinali , Calegario Cristina Lelis Leal 
Published: March 2021

Objective: Consists in explore the relationship between firm size and knowledge to capture the firm innovation performance in Brazilian manufacturing industries.Methodology: Using the production function approach and following the Resource-Based-View – RBV theory, we investigate how the firm internal RD and the degree of intangible assets are moderated by firm size.Originality: The literature in the past decades has tried different methods to find strategies that improve the innovation of a large number of firms in different countries and regions. Yet, there is a large number of firms from emerging economies looking forward to improve productivity and the firm innovation performance.Main results: The results indicated that investment in RD is relevant to the firm performance. Nonetheless, the relationship between RD and firm size showed negative results. In the case of the degree of intangible resources, the same was observed, but the interaction between firm size and intangible assets showed positive effects on the firm performance. Finally, other important characteristics were observed, such as firm age and technology intensity, which showed positive influence over the firm performance.Theoretical contributions: The study showed that the degree of intangible assets is relevant for the firm, as the theory predicts, and it has become valuable for emerging enterprises, once not all firms may conduct RD activities.Social contributions: The findings update the understanding about RD and other intangible assets and provide new information to managers, researchers, and policymakers to develop new policies to promote and finance these activities.
COVID-19 Emergency: Faux Healthcare Service Causes Distress and Life Dissatisfaction
Authors: Bhattacharjee A. , Bansal V. , Juman M. K. I. 
Published: March 2021

Background and Aims: In Bangladesh, a significant number of individuals experienced a faux coronavirus test, especially at the profit oriented private hospitals or clinics during the COVID-19 emergency. Therefore, the prime purpose of the study was to investigate the impact of healthcare service faux pas on the mental health of Bangladeshi people during the COVID-19 pandemic. Additionally, the current study even explored the changes in life satisfaction of Bangladeshi individuals due to the faux SARS-CoV-2 tests in the country. Moreover, the study also dealt with the satisfaction of the people on the healthcare service during the COVID-19 emergency in Bangladesh.
Study Design: The current research was conducted as a descriptive and bi-monthly cross-sectional study and used the snowball sampling technique to collect the survey data in Bangladesh.
Place and Duration of Study: This study was employed in Dhaka division and Comilla division of Bangladesh between June and July in 2020.
Methodology: In this study, we surveyed 393 Bangladeshi individuals from two divisions of the country. We measured mental & physical health (SF12), depression (PHQ2), anxiety (GAD2), distress (K6), life satisfaction and overall satisfaction on healthcare service. Survey data was analyzed on STATA platform to find the study findings.
Results: This research found that Bangladeshi people experienced lower levels of mental and physical health conditions with the mean (STD) values of 23.1 (6.9) and 37.2 (9.1) respectively. Among the study participants, female individuals (60.05%) were mostly dissatisfied with the COVID-19 emergency healthcare service and dealt with more severe mental and physical disorders than male persons (39.95%) in the country. In this perspective, the study explored a dramatic increase in the mental stress and steady decline in life satisfaction of Bangladeshi individuals due to the false COVID-19 test certificates. Therefore, most of them had to go through multiple coronavirus tests to confirm the infected status. Additionally, participants visited at private hospitals for SARS-CoV-2 emergency support had higher levels of distress and dissatisfaction on the private healthcare services. Finally, the study found literally poor life satisfaction among all participants.
Conclusion: The study found mental distress and life dissatisfaction caused by a private healthcare service faux pas in Bangladesh. So, this study suggests that a surge in the private healthcare service faux pas during or post coronavirus pandemic needs sustainable policy standards by the Government and nongovernment concerns. Fruitfully, the proper implementation of new policies especially for the private healthcare organizations is indeed essential to ensure a stress free healthy healthcare environment as well as higher life satisfaction for every individual in the country.
Evaluation of Different Chaba (Piper chaba) Germplasm for Growth and Yield Performances
Authors: Islam Md. Riazul , Mehedi Md. Nazmul Hasan , Ara Rumman , Obaidullah Abu Jafor Mohammad , Moniruzzaman Md. , Aktar Nahida 
Published: March 2021

Genetic diversity is the base for survival of plants in nature and for crop improvement. Diversity in plant genetic resources provides opportunity for plant breeders to develop new and improved cultivars with desirable characteristics. Therefore, an experiment was employed to determine the genetic variability and evaluate the growth performing parameters of different Chaba germplasm at the research field of Regional Spices Research Centre, Bangladesh Agricultural Research Institute, Magura during kharif 1 season in 2018-19 following completely randomized design with three replications. Six germplasm namely PCmag-001, PCmag-002, PCmag-003, PCmag-004, PCmag-005 and PCmag-006 were collected from khulna region of Bangladesh and transplanted adjunct to different tree species mainly mango. Among the six germplasm heighest plant height (450 cm), number of branch (35), number of leaves (350), internodes length (16 cm) and vine diameter (2.5 cm) after one year of planting was recorded from PCmag-001 germplasm followed by PCmag-002 while the lowest plant height (450 cm), number of branch (35), number of leaves (350), internodes length (16 cm) and vine diameter (2.5 cm) were found from the germplasm PCmag-005. Through the observation of one year field trail in terms of growing characteristics the germplasm PCmag-001 and PCmag-002 can be chosen for future breeding material to release a commercial variety in southern part of Bangladesh.
Acid Challenge on Push-Out Bond Strength of Three Different Tricalcium Silicate Cements: An In-vitro Study
Authors: Babu Mattapudi Basavaiah , Raju T. B. V. G. , Varma N. Mahendra , Dondapati Gowtam Dev , Podili Srivalli , Sowjanya Thangi 
Published: March 2021

Aim: To evaluate the impact of environmental pH on intra-radicular dentin push-out bond strengths of MTA, MTA HP, and Biodentine.
Materials and Methodology: Freshly extracted human mandibular single-rooted premolars or maxillary anterior incisors that were either intact or contained only small carious lesions were selected.120 mid root dentins is horizontally divided into 1.0 mm thick slices and divided into 3 MTA, MTA HP, BIODENTINE groups. The compressive load is applied at a speed of 0.5 mm/min by exerting a downward pressure on the outer surface of MTA using a 1.00 mm diameter cylindrical stainless-steel plunger. Maximum load to MTA was reported in newtons at the time of dislodgement and converted to megapascals. The 1-way analysis of variance test was used to compare the push-out bond strength of the groups with the same storage time (4 or 34 days), followed by the pair-wise comparison of the Tukey post hoc test. The Student's t-test was used to evaluate 3-group means. At P = .005, the degree of significance was set. Thus the clinical importance of the present study states that considering several factors like microhardness, composition by products, particle sizes and the environmental pH plays a critical role in selection of root end filling material.
Results: There was significant difference between groups (P = .001) after 4 days of PBS and Acid condition, where Bio dentine had significantly the highest bond strength.
Conclusion: The strength of MTA HP, BIODENTINE, MTA materials at dentine interface increases over 30 days in the storage of PBS solution at pH 7.4, after an initial acid challenge by acetic acid of pH 5.4, which decreases initial bond strength.
Symmetry for exterior elliptic problems and two conjectures in potential theory
Authors: Sirakov Boyan 
Published: July 2002

In this paper we extend a classical result of Serrin to a class of elliptic problems

Δu+f(u,|∇u|)=0

in exterior domains

ℝ^N\setminus G

(or

Ω\setminus G

with

Ω

and

G

bounded). In case

G

is an union of a finite number of disjoint

C^2

-domains

G_i

and

u=a_i>0

,

∂u/∂n=α_i⩽0

on

∂G_i

,

u→0

at infinity, we show that if a non-negative solution of such a problem exists, then

G

has only one component and it is a ball. As a consequence we establish two results in electrostatics and capillarity theory. We further obtain symmetry results for quasilinear elliptic equations in the exterior of a ball.

Résumé

Nous étendons un résultat classique de Serrin à des problèmes elliptiques

Δu+f(u,|∇u|)=0

dans des domaines extérieures du type

ℝ^N\setminus G

(où

Ω\setminus G

, avec

Ω

et

G

bornés). En supposant que

G=\bigcup^k_{i=1}G_i

, où

G_i

sont des domaines disjoints de classe

C^2

, et que

u=a_i>0

,

∂u/∂n=α_i⩽0

sur

∂G_i

,

u→0

à l’infini, nous montrons que ce problème admet une solution classique seulement si

G

a une seule composante connexe et

G

est une boule. Comme conséquence nous obtenons deux résultats sur des problèmes provenant de l’électrostatique et de la théorie de la capillarité. Nous obtenons aussi des résultats de symétrie pour des équations elliptiques quasi-linéaires dans l’extérieur d’une boule.
On the Liouville property for fully nonlinear equations
Authors: Cutrı̀ Alessandra , Leoni Fabiana 
Published: July 2002

In this paper we prove some Liouville theorems for nonnegative viscosity supersolutions of a class of fully nonlinear uniformly elliptic problems in ℝN.

Résumé
Dans ce travail nous démontrons des théorèmes de Liouville pour des sur-solutions de viscosité positives de problèmes uniformement elliptique complètement non linéaires dans ℝN.
Macroscopic limit of Vlasov type equations with friction
Authors: Jabin Pierre-Emmanuel 
Published: July 2002

The purpose of this paper is to investigate the limit of some kinetic equations with a strong force. Due to friction, the solution concentrates to a monokinetic distribution so as to keep the total of force bounded and in the limit we recover a macroscopic system. This kind of asymptotics is a natural question when the mass of the particles is very small or their inertia is neglected. After that we also study the properties of the limit system and especially the uniqueness of solutions which provides the full convergence of the family of solutions to the kinetic equation.

Résumé
Cet article se propose d’étudier la limite de solutions d’une équation cinétique avec frottement lorsque les termes de force deviennent prédominants. A cause du frottement, les solutions se concentrent progressivement en vitesse de manière à ce que la somme des forces reste bornée ; à la limite cette concentration nous oblige à remplacer l’équation cinétique par un système macroscopique. Cette problème apparait notamment quand on fait tendre vers zéro la masse des particules ou quand on néglige leur inertie. Enfin certaines propriétés du système, et particulièrement l’unicité, seront détaillées afin d’obtenir une convergence de toute la suite des solutions et pas seulement d’une suite extraite.
Ground states of semilinear elliptic equations: a geometric approach
Authors: Bamón Rodrigo , Flores Isabel , Pino Manuel del 
Published: July 2002

We consider the problem

\begin{gather*}
\Delta u + u^p + u^q=0, \quad \text{in } \mathbb R^N\\
0<u(x) \to 0 \quad \text{as } |x| \to + \infty
\end{gather*}

where

1<p<(N+2)/(N−2)<q

. We prove that if

q

is fixed and we let

p

approach

(N+2)/(N−2)

from below, then this problem has a large number of radial solutions. A similar fact takes place if we fix

p>N/(N−2)

and then let

q

approach

(N+2)/(N−2)

. If we fix

q

and then let

p

be close enough to

N/(N−2)

then no solutions exist.

Résumé
On considère le problème de trouver des solutions de l’equation elliptique

\Delta u + u^p + u^q=0, \quad \text{dans } \mathbb R^N\\

avec

0<u(x) \to 0 \quad \text{lorsque } |x| \to + \infty

où

1<p<(N+2)/(N−2)<q

. Si l’on fixe

q

et

p

augmente et tend vers

(N+2)/(N−2)

alors il’y a un grand nombre des solutions radials. On peut obtenir un résultat analogue si l’on fixe

p>N/(N−2)

et

q

s’approche de

(N+2)/(N−2)

. En plus, si l’on fixe

q

et l’on prend

p

assez proche de

N/(N−2)

alors il n’existe pas de solution.
Travelling fronts for multidimensional nonlinear transport equations
Authors: Schwetlick Hartmut R 
Published: July 2002

We consider a nonlinear transport equation as a hyperbolic generalisation of the well-known reaction-diffusion equation. We show the existence of strictly monotone travelling fronts for the three main types of the nonlinearity: the positive source term, the combustion law, and the bistable case.
In the first case there is a whole interval of possible speeds containing its strictly positive minimum. For subtangential nonlinearities we give an explicit expression for the minimal wave speed.

Résumé
Nous considérons une équation de transport nonlinéaire comme étant une généralisation hyperbolique de l’équation de réaction-diffusion bien connue. Nous montrons l’existence de fronts progressifs strictement monotones pour les trois principaux types de la nonlinéarité: le terme source positif, la loi de combustion et le cas « bistable ». Dans le premier cas il existe tout un interval de vitesses possibles comprenant son minimum. Dans le cas de nonlinéarités « sous-tangentielles » nous donnons une expression explicite de cette vitesse minimale.
On the minimal action function of autonomous lagrangians associated to magnetic fields
Authors: Dias Carneiro M.J. , Lopes Arthur 
Published: July 2002

In this paper we show the existence of a plateau for the minimal action function associated with a model for a particle under the influence of a magnetic field (Hall effect). We describe the structure of the Mather sets, that is, sets that are supports of minimizing measures for the corresponding autonomous Lagrangian.
This description is obtained by constructing a twist map induced by the first return map defined on a certain transversal section in a fixed level of energy.

Résumé
Dans cet article nous démontrons l’existence d’un plateau pour la fonction d’action minimale associée au modèle du mouvement d’une particule sous l’action d’un champ magnétique (Hall effect). Nous décrivons la structure des ensembles de Mather, c’est-à-dire, les ensembles qui sont le support des mesures minimisantes pour le Lagrangian autonome correspondant.
Cette description est obtenue en construisant une application « twist å induite par l’application de premier retour définie sur une section transverse dans chaque niveau d’énergie.
Hyperbolic characteristics on star-shaped hypersurfaces
Authors: Liu Chun-gen , Long Yiming 
Published: July 2002

In this paper, we study the stability of closed characteristics on a starshaped compact smooth hypersurface

Σ

in

ℝ^{2n}

. We show that the Maslov-type mean index of such a closed characteristic is independent of the choice of the Hamiltonian functions, and prove that on

Σ

either there are infinitely many closed characteristics, or there exists at least one nonhyperbolic closed characteristic, provided every closed characteristic possesses its Maslov-type mean index greater than

2

when

n

is odd, and greater than

1

when

n

is even.

Résumé

Soit

Σ

une hypersurface étoilée compacte,

C^2

, dans

ℝ^{2n}

, qui est obtenue par la méthode de variation directe. Dans cet article, nous étudions la stabilité des caractéristiques fermées sur

Σ

. Nous démontrons que l’indice moyen de type de Maslov d’une telle caractéristique fermée ne dépend pas du choix des fonctions Hamiltoniennes. Si on suppose qu’il n’existe qu’un nombre fini de caractéristiques fermées, alors il existe au moins une caractéristique fermée nonhyperbolique sur

Σ

si pour toute caractéristique fermée sur

Σ

, son indice moyen de type de Maslov est supérieur à

2

, et si

n

est impair (resp.

1

, et si

n

est pair).
Partial regularity results for minimizers of quasiconvex functionals of higher order
Authors: Kronz Manfred 
Published: July 2002

We consider minimizers

u \in W^{m,p}\left(\Omega ,ℝ^{N}\right)

of uniformly strictly quasiconvex functionals

F\left(u\right) = \int _{\Omega }f\left(D^{m}u\right)d\mathcal L^{n}

of higher order. Here

Ω

is a domain in

ℝ^{n}

,

m⩾1

, and

f

is a

C^2

-integrand with growth of order

p

,

p⩾2

. Using the technique of harmonic approximation we give a direct proof of almost everywhere

C^{m,α}

-regularity for such minimizers.

Résumé

Nous étudions des minimiseurs

u \in W^{m,p}\left(\Omega ,ℝ^{N}\right)

des fonctionnelles

F\left(u\right) = \int _{\Omega }f\left(D^{m}u\right)d\mathcal L^{n}

uniformément strictement quasiconvexes du ordre

2m

,

m⩾1

. Ici,

Ω ⊂ ℝ^n

est une domaine et

f

est une fonction de classe

C^2

avec une crossance du ordre

p

,

p⩾2

. À l'aide de la technique d'approximation harmonique nous obtenons une preuve directe pour la regularité de classe

C^{m,α}

pour les minimiseurs dans un ensemble ouvert

\widetilde \Omega \subset \Omega

avec

\mathcal L^{n}(\Omega \backslash \widetilde \Omega) = 0

.
Homogenization of a quasi-linear problem with quadratic growth in perforated domains: An example
Authors: Casado-Díaz Juan 
Published: July 2002

We study the homogenization of Dirichlet problems for a fixed quasi-linear operator which is the perturbation of the Laplace operator by the square of the gradient, when the domain varies arbitrarily. With respect to the Dirichlet problem for the linear Laplace operator posed on the same domains, a new nonlinear zeroth order term appears in the homogenized problem. We also give a corrector result.

Résumé
On étudie l’homogénéisation de problèmes de Dirichlet pour un opérateur quasi-linéaire fixe qui est la perturbation de l’opérateur de Laplace par le carré du gradient, pour une suite de domaines qui varient arbitrairement. Par rapport au problème de Laplace avec des conditions de Dirichlet posé sur les mêmes domaines, il apparaît un nouveau terme non-linéaire d’ordre zéro dans le problème homogénéisé. On obtient aussi un résultat de correcteur.
Minimizing a functional depending on $\nabla u$ and on $u$
Authors: Cellina Arrigo 
Published: July 2002

We prove existence of solutions for a class of minimum problems of the Calculus of Variations, where the integrand depends both on

\nabla u

and on

u

.

Résumé

On donne un théorème d’existence de solutions pour un problème du calcul des variations ou la fonctionnelle dépend de

u

et de

\nabla u

.
Uniqueness and asymptotic behavior of solutions with boundary blow-up for a class of nonlinear elliptic equations
Authors: Marcus M. , Véron L. 
Published: July 2002

We study the uniqueness and expansion properties of the positive solutions

u

of

(E)

Δu + hu − ku^p = 0

in a non-smooth domain

Ω

, subject to the condition

u(x) → ∞

when

\operatorname{dist} (x, ∂Ω) → 0

, where

h

and

k

are continuous functions in

\overline\Omega

,

k > 0

and

p > 1

. When

∂Ω

has the local graph property, we prove that the solution is unique. When

∂Ω

has a singularity of conical or wedge-like type, we give the asymptotic behavior of

u

. When

∂Ω

has a re-entrant cuspidal singularity, we prove that the rate of blow-up may not be of the same order as in the previous more regular cases.

Résumé

Nous étudions les propriétés d’unicité et de comportement limite des solutions positives

u

de

(E)

Δu + hu − ku^p = 0

dans un domaine non régulier

Ω

, sujettes à la condition

u(x) → ∞

quand

\operatorname{dist} (x, ∂Ω) → 0

, où

h

et

k

sont des fonctions continues dans

\overline\Omega

,

k > 0

et

p > 1

. Quand

∂Ω

a la propriété du graphe local, nous démontrons que la solution est unique. Quand

∂Ω

a une singularité de type conique ou dièdrale, nous donnons le comportement asymptotique de

u

. Quand

∂Ω

a une singularité cuspide rentrante, nous montrons que l’ordre de l’explosion peut ne pas être le même que dans les cas précédents.
Regularity at the free boundary of two-dimensional stationary harmonic maps
Authors: Grüter Michael 
Published: July 2002

It is shown that the regularity problem at the free boundary of two-dimensional stationary harmonic maps can be reduced to the corresponding problem for two-dimensional minimal surfaces and that the analogous regularity results hold true.

Résumé
On montre que le problème de la régularitéà la frontière libre d’une application harmonique stationnaire bidimensionnelle peut être réduit au problème analogue pour les surfaces minimales, et que les résultats de régularité correspondants sont encore vrais.
Saddle-focus singular cycles and prevalence of hyperbolicity
Authors: San Martín Bernardo 
Published: July 2002

The objective of this work is to study the 2-parameter unfolding of an intricate bifurcating dynamical structure in dimension 3, namely a saddle-focus singular cycle. It is showed that hyperbolicity is a prevalent phenomena: the initial system is a total density point of hyperbolic dynamics. This dynamic exhibit either simple critical elements or nontrivial basic set. It seems to be the first time that non-trivial hyperbolicity (as well as its prevalence) is proved for the maximal invariant set for a perturbation of a vector field with a cycle containing a saddle-focus singularity.

Résumé
L’objectif de ce travail est l’étude du développement à 2 paramètres d’une structure dynamique complexe avec bifurcation en dimension 3, à savoir un cycle singulier « selle-foyer å. Nous montrons que l’hyperbolicité est un pénomène prévalant : le système initial est un point de densité totale de dynamiques hyperboliques. Cette dynamique présente ou bien des éléments critiques simples ou un ensemble fondamental non trivial. Cela semble le premier ensemble où l’hyperbolicité non triviale (et sa prévalence) est prouvée pour l’ensemble invariant maximal pour une perturbation d’un champ vecteur à un cycle contenant une singularité « selle-foyer å.