co2 is the main greenhouse gas which urban forests have a high potential to absorb and sequestrate it. the air pollution of tehran is one of the most important environmental problems of the iran. to do this research 40 years old stands of robinia pseudoacacia and fraxinus rotundifolia and the surrounding barren land ( as blank) were selected in chitgar forest park of tehran and the amount of ca...

land use planning is the main core of urban planning and one of the main components of an urban system. this element has close relation with transportation system of the city, so if their interaction becomes insufficient, deterioration and chaos would have an adverse impact on the urban system and would cause serious environmental issues. the integrated land use-transportation models seem to b...

27 Evaluating the Impact of Information Technology on Knowledge Management Performance with Balance Scorecard Approach; Seyed Hossein Siadat, Group of IT-Management, Department of Management and Accounting, Shahid Beheshti University, Tehran, Iran Ali Abdollahi, Group of Entrepreneurship Management, Department of Management and Accounting, Shahid Beheshti University, Tehran, Iran Laleh Garshasb...

according to world statistics the highest percentage of tourists are belong to urban ecotourism and this percentage is increasing steadily. therefore, the urban ecotourism has very high potential in attracting of tourists as well as in producing of financial resources and job opportunities. many cities of iran including tehran are benefiting very diverse climatic conditions and so many places t...

like other developing countries, iranian cities are growing and expanding physically at a high speed. for about five decades, the only policy of the urban development plans in the field of urban growth management has been definition of the urban growth boundary (u.g.b.) which is still used without any major modifications.despite the slight evidences indicating the ineffectiveness of the current...

like other developing countries, iranian cities are growing and expanding physically at a high speed. for about five decades, the only policy of the urban development plans in the field of urban growth management has been definition of the urban growth boundary (u.g.b.) which is still used without any major modifications.despite the slight evidences indicating the ineffectiveness of the current...

1. introduction nowadays, population increase, progress in science and technology and development of industrial installations with the shortage of places in metropolitan areas have made considerable changes in the morphology of watersheds. violation to territory of rivers, channels, and streams causes alterations in natural drainage pattern and overflowing due to the lower capacity of the chang...