نتایج جستجو برای: permanence
تعداد نتایج: 2253 فیلتر نتایج به سال:
the paper is concerning preliminary survey of qaradaq region of eastern azerbaijan in view of ecological, archaeological and ethnographic perspectives. the region under study is poor in fertile soil, underpopulated settlements and nomadic ubas being its dominant landscape. indeed, archaeological investigations show the lack of considerable archaeological records up to the iron age. the main sub...
This two-part article considers how digital culture has influenced ideas about permanence. It examines the change in collecting practices in one legal deposit library. The author considers how the idea of permanence, understood in cultural heritage terms, influences digital culture, and, thus, digital technology. The first part of the article addresses the concepts associated with permanence, d...
In this chapter we describe Theorema, a system for supporting mathematical proving by computer. The emphasis of the chapter is on showing how, in many situations, proving can be reduced to solving in algebraic domains. We first illustrate this by known techniques, in particular the Gröbner bases technique. Then we go into the details of describing the PCS technique, a new technique that is part...
In this paper, we study dynamic commensalism model with nonmonotic functional response, density dependent birth rates on time scales and derive sufficient conditions for the permanence. We also establish the existence and uniform asymptotic stability of unique almost periodic positive solution of the model by using Lyapunov functional method.
Numerical experiments suggest that cooperation is a very rare phenomenon in autocatalytic networks with more than about five interacting species. There is strong evidence that the probability for cooperative behavior in random networks decreases at least exponentially and at most as an2 with the number n of interacting species. The evolution of larger persistent networks by subsequent incorpora...
We modify the commonly used invasibility concept for coexistence of species to the stronger concept of uniform invasibility. For two-species discrete-time competition and predator-prey models, we use this concept to find broad easily checked sufficient conditions for the rigorous concept of permanent coexistence. With these results, permanent coexistence becomes a tractable concept for many dis...
Generally a biological system is said to be permanent if under small perturbations none of the species goes extinction. In 1979 P. Schuster, K. Sigmund, and R. Wolff [15] introduced concept permanence as stability notion for systems that models self-organization macromolecules. After, in 1987 W. Jansen rid="b9">9], J. Ho...
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