نتایج جستجو برای: ecological patches

تعداد نتایج: 122902  

Journal: :Environmental Modelling and Software 2003
C. Ricotta Piermaria Corona Marco Marchetti Gherardo Chirici S. Innamorati

Landscape ecology starts from the assumption that diversity and spatial arrangement of ecosystem mosaics have ecological implications and tries to understand the interactions between diversity and structure of large spatially heterogeneous areas and their ecological functions. These assumptions imply effective use of earth observation techniques and geographic information systems, enabling a gl...

2011
Jonas Linderoth

This paper outlines a framework for understanding gameplay from the perspective of ecological psychology. According to this perspective, gameplay can be described in terms of perceiving, acting on and transforming the affordances that are related to a game system or to other players in a game. Challenges in games have an emphasis on perceiving suitable actions and/or performing suitable actions...

پایان نامه :0 1371

in order to examine the ecological conditions and characteristics of fraxinus excelsior l. in the northern forests of iran 6 main areas as well as some miscellaneous ones , have been selected in the region respectively in : lomir2, shafaroud , park - e-noor , ahlam , alandan and noor.

Journal: :Theoretical population biology 2008
Eli E Goldwyn Alan Hastings

While spatial synchrony of oscillating populations has been observed in many ecological systems, the causes of this phenomenon are still not well understood. The most common explanations have been the Moran effect (synchronous external stochastic influences) and the effect of dispersal among populations. Since ecological systems are typically subject to large spatially varying perturbations whi...

Journal: :SIAM J. Math. Analysis 2017
Gregory Roth Paul L. Salceanu Sebastian J. Schreiber

We consider ecological difference equations of the form X i t+1 = X i t Ai(Xt) where X i t is a vector of densities corresponding to the subpopulations of species i (e.g. subpopulations of different ages or living in different patches), Xt = (X 1 t , X 2 t ,. .. , X m t) is state of the entire community, and Ai(Xt) are matrices determining the update rule for species i. These equations are perm...

2016
K. T. Tuff T. Tuff K. F. Davies

Habitat fragmentation changes thermal conditions in remnant patches, and thermal conditions strongly influence organism morphology, distribution, and activity patterns. However, few studies explore temperature as a mechanism driving ecological responses to fragmentation. Here we offer a conceptual framework that integrates thermal biology into fragmentation research to better understand individ...

Journal: :I. J. Bifurcation and Chaos 2015
Russell Jeter Igor Belykh

We study synchronization in ecological networks under the realistic assumption that the coupling among the patches is sporadic/stochastic and due to rare and short-term meteorological conditions. Each patch is described by a tritrophic food chain model, representing the producer, consumer, and predator. If all three species can migrate, we rigorously prove that the network can synchronize as lo...

Journal: :iranian journal of pharmaceutical sciences 0
hindustan abdul ahad department of pharmaceutics, college of pharmacy, sri krishnadevaraya university, anantapur- 515003, andhra pradesh, india chitta suresh kumar department of pharmaceutics, college of pharmacy, sri krishnadevaraya university, anantapur- 515003, andhra pradesh, india cm anuradha department of pharmaceutics, college of pharmacy, sri krishnadevaraya university, anantapur- 515003, andhra pradesh, india kishore kumar reddy department of pharmaceutics, college of pharmacy, sri krishnadevaraya university, anantapur- 515003, andhra pradesh, india a chandra sekhar department of pharmaceutics, college of pharmacy, sri krishnadevaraya university, anantapur- 515003, andhra pradesh, india

the present study was performed to explore the matrix property of ficus glomerata fruit mucilage for making transdermal patches. the mucilage was evaluated for its physicochemical properties. various transdermal patches of indomethacin were prepared by solvent evaporation technique using different proportions of f. glomerata fruit mucilage. the compatibility studies between indomethacin and f. ...

2000

Discusses the interaction between socio-economic systems and their natural environment, by examining the indicators of sustainable development. Areas covered by the operationalization of sustainable development indicators; Details on the global nature of environmental problems; Important strategy of the operationalization of sustainable development; Link between economic data and ecological ind...

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