Most population studies conclude that today's skyrocketing growth in human population is creating a serious underlying threat to the well being of the world's natural and economic resources. Whether neem, can help to reduce runaway population growth is' uncertain. However, as noted earlier, exploratory research has indicated that certain neem, ingredients have contraceptive properties. Thus it ...

The objective of this study was to develop a decision tree to evaluate the economic impact of different durations of intramammary treatment for the first case of mild or moderate clinical mastitis (CM) occurring in early lactation with various scenarios of pathogen distributions and use of on-farm culture. The tree included 2 decision and 3 probability events. The first decision evaluated use o...

In mobile ad hoc peer-to-peer (M-P2P) networks, economic models become a necessity for enticing non-cooperative mobile peers to provide service. M-P2P users may issue queries with varying constraints on query response time, data quality of results and trustworthiness of the data source. Hence, we propose ConQuer, which is an economic incentive model for the efficient processing of constraint qu...

nitrogen is produced mainly from its most abundant source, the air, using three processes: membrane, pressure swing adsorption (psa) and cryogenic. the most common method for evaluating a process is using the selection diagrams based on feasibility studies. since the selection diagrams are presented by different companies, they are biased, and provide unsimilar and even controversial results. i...

plane and mulberry trees play a crucial role in purifying the polluted air in tehran as a majorcity. in this research, 13 main districts of tehran city were chosen as study area. 20 completely healthy planeand mulberry species were selected in similar ecological conditions and age range. the uptake of cd and pbwas determined using spectrophotometry, whereas the chlorophyll content was measured ...

Overview In this chapter we examine the relationship between increases in the capital stock and economic growth. We first discuss whether an economy can always grow if it increases only its capital stock. Under certain plausible assumptions, we show this is not possible, and that poorer countries should therefore grow faster than wealthy ones, whose economies will depend more on technological p...

We develop a conceptual framework for valuing biodiversity from an economic perspective. We argue for a dynamic economic welfare measure of biodiversity that complements the literature on beneŽ t-cost approaches and genetic distance/phylogenic tree approaches. Using a uniŽ ed model of optimal economic management of an ecosystem under ecological and genetic constraints, we identify gains from ma...