aging coefficient (ac) or aged-child ratio or age composition; takes into account the numbers and areas at both ends of the age distribution simultaneously. ac is the total number of individuals aged 65 years and more, divided by the total number of individuals aged 14 years, multiplied by 100. herein, age composition in iranian popu1ations, according to different provinces, place of residence ...

Service composition is a recent field that has seen a flurry of different approaches proposed towards the goal of flexible distributed heterogeneous interoperation of software systems, usually based on the expectation that such systems must be derived from higher level models rather than be coded at low level. We propose a conceptual modelling approach for the composition of service processes i...

This paper explores the use of an Agent Factory for the composition of web services. Previous work proposed a structuring approach for automated reconfiguration of agents by an Agent Factory. The question is whether the same approach can be applied to web service composition, i.e. whether DAML-S descriptions of web services offer enough structure for automated configuration by the Agent Factory...

‎the harmonic index of a connected graph $g$‎, ‎denoted by $h(g)$‎, ‎is‎ ‎defined as $h(g)=sum_{uvin e(g)}frac{2}{d_u+d_v}$‎ ‎where $d_v$ is the degree of a vertex $v$ in g‎. ‎in this paper‎, ‎expressions for the harary indices of the‎ ‎join‎, ‎corona product‎, ‎cartesian product‎, ‎composition and symmetric difference of graphs are‎ ‎derived‎.

In the last decade there was a remarkable increase in number of studies incorporating species functional traits to quantify diversity communities (i.e., diversity). The approach has contributed advances theoretical and applied ecology. Studies developed Brazil represent significant portion world's scientific production on stream fish diversity. However, is clear bias, with most assessing commun...

Thermodynamic, achievable, and realistic efficiency limits of solar-driven electrochemical conversion of water and carbon dioxide to fuels are investigated as functions of light-absorber composition and configuration, and catalyst composition. The maximum thermodynamic efficiency at 1-sun illumination for adiabatic electrochemical synthesis of various solar fuels is in the range of 32-42%. Sing...

Landscape metrics are used in landscape ecology to quantify landscape characteristics related to structure, function and change by quantifying the structure and distributional pattern of landscape elements such as plants, animals and other physical landscape features. To date, there has been little published research on landscape metrics that include social perceptions of landscape. In this pap...