Results 31 to 40 of about 24,345 (312)

Mertensโ Theorem for some certain intermediate growths

open access: yesSongklanakarin Journal of Science and Technology (SJST), 2022
Songklanakarin Journal of Science an Technology (SJST), 44, 1, 201 ...
openaire   +2 more sources

Coexistence for a resource-based growth model with two resources

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2003
We investigate the coexistence of positive steady-state solutions to a parabolic system, which models a single species on two growth-limiting, non-reproducing resources in an un-stirred chemostat with diffusion.
Yifu Wang, Y. Meng
doaj   +1 more source

Energy, Entropy, Constraints, and Creativity in Economic Growth and Crises

open access: yesEntropy, 2020
The neoclassical mainstream theory of economic growth does not care about the First and the Second Law of Thermodynamics. It usually considers only capital and labor as the factors that produce the wealth of modern industrial economies.
Reiner Kümmel, Dietmar Lindenberger
doaj   +1 more source

Boundary growth theorems for superharmonic functions

open access: yesArkiv för Matematik, 1999
The paper examines the boundary behaviour of superharmonic functions \(u(X',x)\) on the half-space \({\mathbf{R}}^{n-1}\times (0,\infty)\) in terms of the behaviour along the lines normal to the boundary. In [Proc. Amer. Math. Soc. 124, No. 12, 3721-3727 (1996; Zbl 0868.31006)] the author has proved that if the set \[ E=\{X':\limsup_{x\to 0+}u(X',x ...
openaire   +3 more sources

Plant root growth and the marginal value theorem [PDF]

open access: yesProceedings of the National Academy of Sciences, 2009
All organisms must find and consume resources to live, and the strategies an organism uses when foraging can have significant impacts on their fitness. Models assuming optimality in foraging behavior, and which quantitatively account for the costs, benefits, and biological constraints of foraging, are common in the animal literature.
McNickle, G. G., Cahill jr, J. F.
openaire   +3 more sources

Fourth-order elliptic problems with critical nonlinearities by a sublinear perturbation

open access: yesNonlinear Analysis, 2021
In this paper, we get the existence of two positive solutions for a fourth-order problem with Navier boundary condition. Our nonlinearity has a critical growth, and the method is a local minimum theorem obtained by Bonanno.
Lin Li, Donal O’Regan
doaj   +1 more source

Unique Performance Considerations for Printable Organic Semiconductor and Perovskite Radiation Detectors: Toward Consensus on Best Practice Evaluation

open access: yesAdvanced Functional Materials, EarlyView.
A lack of standard approaches for testing and reporting the performance of metal halide perovskites and organic semiconductor radiation detectors has resulted in inconsistent interpretation of performance parameters, impeding progress in the field. This Perspective recommends key metrics and experimental details, which are suggested for reporting in ...
Jessie A. Posar   +8 more
wiley   +1 more source

Uma revisão das controvérsias sobre a Equação de Cambridge [PDF]

open access: yesNova Economia, 2005
The objective of this article is to make a critical evaluation of the controversies about the Cambridge Equation both in the initial phase - when Pasinetti, Kaldor, Meade, Samuelson and Modigliani got involved - and in the second round that followed the ...
José Luís Oreiro
doaj  

Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications

open access: yesAdvanced Functional Materials, EarlyView.
Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai   +8 more
wiley   +1 more source

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