Results 21 to 30 of about 7,726,351 (314)

On Λ-Fractional Wave Propagation in Solids

open access: yesMathematics, 2023
Wave propagation in solids is discussed, based upon inherently non-local Λ-fractional analysis. Following the governing equations of Λ-fractional continuum mechanics, the Λ-fractional wave equations are derived.
Kostantinos A. Lazopoulos   +1 more
doaj   +1 more source

How did climate drive the historical distribution of relict plants: a case study on Metasequoia using deep-time ecological niche modelling [PDF]

open access: yesPeerJ
Relict plants are those that once had a wide distribution but are now restricted to small areas. It is important to study the process of their distribution in the geological past to better understand the climatic factors that shape their current ...
Junmei Chen   +4 more
doaj   +2 more sources

Characterizations of Global Transversal Exponential Stability [PDF]

open access: yesIEEE Transactions on Automatic Control, 2021
We study the relationship between the global exponential stability of an invariant manifold and the existence of a positive semi-definite Riemannian metric which is contracted by the flow. In particular, we investigate how the following properties are related to each other (in the global case): i).
Vincent Andrieu   +2 more
openaire   +3 more sources

How to safeguard soil health against silver nanoparticles through a microbial functional gene-based approach?

open access: yesEnvironment International
Silver nanoparticles (AgNPs), a major anthropogenic stressor, can threaten soil health by disrupting vital microbial processes critical to maintaining key soil functions such as nutrient cycling, organic matter decomposition, and soil structure formation.
Sandhya Mishra, Xiaodong Yang
doaj   +1 more source

Comparative analysis of global stability of the typical structural systems of multi-storey steel buildings [PDF]

open access: yesFacta Universitatis. Series: Architecture and Civil Engineering, 2012
The paper presents global stability comparative analysis of two distinctive structural systems for one 25 - storey high steel building. These are the system with rigid and the system with hinged joint connections between beams and columns in the steel
Cilić Aleksandra   +2 more
doaj   +1 more source

Trade-offs between soil splash and water infiltration modulate erosion dynamics following rubber-to-balsa plantation conversion

open access: yesAgricultural Water Management
Accelerated soil erosion driven by improper land-use changes severely threatens the sustainability of global plantation ecosystems. Although forest conversion is known to intensify splash erosion—the critical initial phase of water erosion—it remains ...
Xia Yuan   +7 more
doaj   +1 more source

Drivers of toxic element accumulation in terrestrial ecosystems across elevational gradients

open access: yesEcological Indicators
Terrestrial ecosystems, account for approximately 31% of the global land area and play a significant role in the biogeochemical cycling of toxic elements.
Baba Imoro Musah, Jie Yang, Guorui Xu
doaj   +1 more source

Global stability of a delayed and diffusive virus model with nonlinear infection function

open access: yesJournal of Biological Dynamics, 2021
This paper studies a delayed viral infection model with diffusion and a general incidence rate. A discrete-time model was derived by applying nonstandard finite difference scheme. The positivity and boundedness of solutions are presented.
Yan Geng, Jinhu Xu
doaj   +1 more source

An SEIR model with infectious latent and a periodic vaccination strategy

open access: yesMathematical Modelling and Analysis, 2021
An SEIR epidemic model with a nonconstant vaccination strategy is studied. This SEIR model has two disease transmission rates β1 and β2 which imitate the fact that, for some infectious diseases, a latent person can pass the disease into a susceptible one.
Islam A. Moneim
doaj   +1 more source

Kin recognition in plants-an ecological perspective: an overview of plant kin recognition under different resources, consequences and future challenges

open access: yesJournal of Plant Interactions
Kin recognition in plants is a debated topic, with mixed evidence on whether plants can distinguish kin from non-kin and adjust their behavior accordingly.
Jan Sher   +4 more
doaj   +1 more source

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