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...

The selection of the best suppliers is a key issue for many companies. Nevertheless, it is important to highlight that the most economical supplier may not be the one that has the lowest purchase price. The cheapest supplier is the one that represents the lowest cost to the company, after being considered various aspects of supplying, such as quality, reliability of deliveries, the history of s...

this study examined the relationship between psychological ownership dimensions and deviant behavior of physical education teachers in bojnourd city. this study was applied in terms of aim and descriptive - correlation in terms of data collection. the statistical population consisted of male and female physical education teachers in bojnourd city (n=160) and 113 teachers were randomly selected....

abstract nowruzak (salvia leriifolia) of lamiaceae family has a good capability for domestication in khorasan’s natural habitats. in order to investigate the effect of sowing design and depth in seedling emergence and permanence, a split plot experiment based on a randomized complete block design was performed with three replications. results indicated sowing design in all three parameters, sow...

Recognizing people based on their biological or behavioral characteristics, called biometric authentication, has been applied over hundred years. Two important issues, 1) distinctiveness and 2) permanence should be considered for biometric authentication. Distinctiveness of a biometric refers to that any two persons should be sufficiently different in terms of the features in the biometrics. Pe...

The ability to create and hold a mental schema of an object is one of the milestones in cognitive development. Developmental scientists have named the behavioral manifestation of this competence object permanence. Convergent evidence indicates that frontal lobe maturation plays a critical role in the display of object permanence, but methodological and ethical constrains have made it difficult ...