Some critics of invasion biology have argued the ecosystems by nonindigenous species can create more valuable ecosystems. They consider invaded communities as because they potentially produce ecosystem services. To establish that introduction creates ecosystems, defend value is provisioned These services are derived from productivity, production and cycling resources. Ecosystem productivity a r...

the purpose of this study is to evaluate the impact of import of technology on iranian economy. we have used multi-sectoral and multi–regional computable general equilibrium gtap model. transfer of technology from one region to another is another factor effecting productivity. trade is one of the channels that speeds the transfer of technology. the effect of a ten percent productivity shock, in...

The success recently encountered by physically-based modeling (or model-based approaches) for music should not mask the deep challenges that remain in this area. This article first proposes an overview of the various goals that researchers and musicians, respectively operating from scientific and end-user perspectives, may pursue. Among these goals, those recently proposed or particularly criti...

agent-based negotiation is one of the interesting approaches in the field of automated negotiation in the e-commerce world. establishment an automated negotiation needs to develop a mechanism for it and it is obvious that users would accept a mechanism that is reliable alternative for negotiating individual. therefore, the need to developing efficient and reliable agent-based negotiation mechan...

in recent years a variety of system models for providing community based health care services for the elderly has been envisioned and implemented in the developed countries which meet the special care needs of different groups of elders. in iran as a developing country, a considerable percentage of old people live in the society need to receive specialized care and health services. in order to ...

this paper studies a maintenance policy for a system composed of two components, which are subject to continuous deterioration and consequently stochastic failure. the failure of each component results in the failure of the system. the components are inspected periodically and their deterioration degrees are monitored. the components can be maintained using different maintenance actions (repair...

the older population in the world especially in iran is growing. according to census the number of individuals aged is approaching5/07 million in 2006 the nation is bracing for the aging of baby boom generation in 20 next year, which will swell the 65 and older population to10 million by 2020 and 26 million by 2050. (iran census, 2006) this population trends ported increased demand for health c...

background: self-medication by people is one of the major issues in the world that can be lead to numerous medical and economic problems, this especially issue in children under 2 years who are at the age of growth and development have great importance. the aim of this study was investigate the effects of model-based educational interventions on self-medication behavior in mothers with children...