Results 31 to 40 of about 5,122,542 (341)

Development of the Capacitated Maximal Covering Location Problem (CMCLP) Model in Determining the Location and Type of Distribution Center

OPSI, 2022
Facility location decision making is necessary for both the public and private sectors for optimum utilization of resources. While the private sector may locate facilities to maximize profit or minimize cost, the public sector aims at providing services ...
Santoso Santoso, Rainisa Maini Heryanto
doaj   +1 more source

Internet gaming disorder, psychological distress, and insomnia in adolescent students and their siblings: An actor-partner interdependence model approach

Addictive Behaviors Reports, 2021
Background: Associations between internet gaming disorder (IGD), psychological distress, and sleep have been reported. However, little is known whether such associations exist across siblings; that is, whether adolescents’ IGD symptomatology may impact ...
Chung-Ying Lin, Mac N. Potenza, Anders Broström, Amir H. Pakpour   +3 more
doaj   +1 more source

Journey to the center of the linear ordering problem [PDF]

Proceedings of the 2020 Genetic and Evolutionary Computation Conference, 2020
TIN2016-78365-R IT1244 ...
Hernando, L., Mendiburu, A., Lozano, J.A.   +2 more
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Algebraic particular integrals, integrability and the problem of the center [PDF]

Transactions of the American Mathematical Society, 1993
In this work we clarify the global geometrical phenomena corresponding to the notion of center for plane quadratic vector fields. We first show the key role played by the algebraic particular integrals of degrees less than or equal to three in the theory of the center: these curves control the changes in the systems as parameters vary.
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Elementary solutions of the quantum planar two-center problem [PDF]

EPL (Europhysics Letters), 2016
Revised version.
González León, Miguel Ángel, Mateos Guilarte, Juan, Torre Mayado, Marina de la   +2 more
openaire   +3 more sources

The center problem for the class of $$\varLambda -\varOmega $$ differential systems [PDF]

Rendiconti del Circolo Matematico di Palermo Series 2, 2020
The article deals with planar analytical and polynomial differential systems having a weak center at the origin. The center is called weak if the first Poincaré-Lyapunov integral of the system can be written as \(H=1/2\left(x^{2} +y^{2} \right)\left(1+\mathrm{h.o.t.}\right)\). In [\textit{M. A. M. Alwash} and \textit{N. G. Lloyd}, Proc. R. Soc. Edinb.,
Jaume Llibre, Rafael Ramírez, Valentín Ramírez   +2 more
openaire   +2 more sources

Calculation of the relativistic Bethe logarithm in the two-center problem

, 2013
We present a variational approach to evaluate relativistic corrections of order \alpha^2 to the Bethe logarithm for the ground electronic state of the Coulomb two center problem.
Hilico, Laurent, Karr, Jean-Philippe, Korobov, Vladimir I.   +2 more
core   +3 more sources

The problem of the center for cubic differential systems with two affine non-parallel invariant straight lines of total multiplicity three

Acta et Commentationes: Ştiinţe Exacte şi ale Naturii
In this paper, we show that a center-focus critical point of cubic differential systems with two affine non-parallel invariant straight lines of total multiplicity three is a center type if and only if the first five Lyapunov quantities vanish.  
Alexandru Șubă
doaj   +1 more source

The problem of refusal from immunodiagnosis of tuberculosis: results of a multi-center sociological study

Туберкулез и болезни лёгких, 2020
The objective: to study the reasons for the refusal of legally authorized representatives of children to conduct mass immunodiagnosis of tuberculosis using a representative sample of population and to outline possible ways to change this negative ...
T. N. Kazykina, S. A. Sterlikov, E. S. Borisova, N. V. Gripekina, E. N. Dolzhenko, Zh. V. Elenkina, L. V. Kozlova, B. M. Maliev, P. A. Fadeev, V. A. Khorotetto   +9 more
doaj   +1 more source

Problematic Use of Internet-Related Activities and Perceived Weight Stigma in Schoolchildren: A Longitudinal Study Across Different Epidemic Periods of COVID-19 in China

Frontiers in Psychiatry, 2021
Background: Social distancing and school suspension due to the coronavirus pandemic (COVID-19) may have a negative impact on children's behavior and well-being.
Xavier C. C. Fung, Andrew M. H. Siu, Marc N. Potenza, Marc N. Potenza, Kerry S. O'Brien, Janet D. Latner, Chao-Ying Chen, I-Hua Chen, I-Hua Chen, Chung-Ying Lin, Chung-Ying Lin, Chung-Ying Lin   +11 more
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