نتایج جستجو برای: 1998 1 distribution of cities in urban network is called urban hierarchy farid
تعداد نتایج: 24881690 فیلتر نتایج به سال:
one of the most important number sequences in mathematics is fibonacci sequence. fibonacci sequence except for mathematics is applied to other branches of science such as physics and arts. in fact, between anesthetics and this sequence there exists a wonderful relation. fibonacci sequence has an importance characteristic which is the golden number. in this thesis, the golden number is observed ...
focus on political, economic, cultural city of kermanshah, the reasons for moving to the city, and consequently, it is natural population growth. this part of the urban hierarchy rule out - as far and despite the high potential for job creation in the province are because of the unbalanced distribution of population, the potential of the whole province is not to be used, so that today we face t...
1- Introduction Sabzevar with population of 230,000 is being considered as one of the fairly populated city located in north eastern section of the country. However, this city produces 235 tons of daily waste or garbage daily and ranks as a second order in terms of waste production in Khorasan province .This city is encountered with high population growth and its corresponding waste problems. ...
extended abstract 1. introduction the important roles played by green space are the social, economic, cultural and environmental aspects of sustainable development. thus, the quality and quantity of green space should be appropriate to the physical size of the city and the needs of society and also it should be developed according to the ecological conditions of the city and its future developm...
objectives the aim of this study was to assess soils of khorramabad metropolis in order to establish the concentration of lead and develop a contamination factor map. materials and methods soil samples were collected from 25 different urban parks in khorramabad, iran. the mean pb contents in the urban topsoil samples were compared with mean concentrations for other cities around the world. a sp...
the community dynamics of aquatic coleoptera(insecta)in one of the spring-stream habitats of bammo national park in fars province called cheshmeh-ye-ghanbari is studied as a pilot project and model for acquaintance with and furthering the biodiversity studies on fauna of iran. sixteen species-populations out of nineteen of this community were already identified for their taxonomy and for thei...
The notion of a hierarchy among cities has long been part of the theoretical tool kit of urban sociologists, geographers, and economists. Reviewing the evolution of the urban hierarchy concept, this paper empirically demonstrates a hypothesized transition in the U.S. urban hierarchy during the twentieth century, from size based to network based. Three urban types, following distinct trajectorie...
any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...
section{introduction} the concept of {sl cartan geometry} appeared at the beginning of the twentieth century, when {e}lie cartan was working on the so-called {sl equivalence problem}, the aim of which is to determine whether two given geometric structures can be mapped bijectively onto each other by some diffeomorphism. this problem can be considered in many different contexts, such as ...
1- Introduction Urban morphology started to take place as an organized field of knowledge at the end of the nineteenth century (Whitehand,2007:1). Regarding the variety of forces that shape cities, it is natural to accept this field of knowledge as an interdisciplinary field. Urban morphology is briefly defined as: The study of the form of cities over the time (Scheer, 2002: 106). The fi...
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