We analyze the entire publication database of the American Physical Society generating longitudinal (50 years) citation networks geolocalized at the level of single urban areas. We define the knowledge diffusion proxy, and scientific production ranking algorithms to capture the spatio-temporal dynamics of Physics knowledge worldwide. By using the knowledge diffusion proxy we identify the key ci...

pisciculture, especially in countries which are unable to develop their marine resources, is a desired to provide part of their food and protein needs. this study aims at investigating welfare impacts of energy subsidy removal on fish producers in fars province. to achieve the objective, cross-sectional data obtained from fish producers of fars province in 2010 was used. cost, input demand and ...

Nitrous oxide can be produced in soils by biological or chemical processes in which nitrogen compounds are transformed. The occurrence and course of these processes are affected by different factors, e.g. temperature, pH, aeration of the soil, availability of organic substances and availability of inorganic nitrogen (e.g. nitrate and ammonium). How these factors affect nitrogen transformations ...