نتایج جستجو برای: ineffective transport system in large cities including tehran
تعداد نتایج: 17471564 فیلتر نتایج به سال:
abstract according to increase in electricity consumption in one hand and power systemsreliability importance in another , fault location detection techniqueshave beenrecentlytaken to consideration. an algorithm based on collected data from both transmission line endsproposed in this thesis. in order to reducecapacitance effects of transmission line, distributed parametersof transmission line...
the treatment of in completely formed pulpless teeth has presented considrable problems. these teeth have wide open apexes and the walls of the root canal diverge toward the apical tissues. mechanical preparation cannot be done in the normal manner beacause of the large initial size and the taper of apical part of the canal , a mechanical stop cannot be produced at the apex of the canal and , t...
the history of plant’s used for mankind is as old as the start of humankind. initially, people used plants for their nutritional proposes but after the discovery of medicinal properties, this natural ?ora became a useful source of disease cure and health improvement across various human communities. berberis vulgaris is one of the medicinal plants used in iranian traditional medicine. berberis ...
Transport is associated with environmental problems, economic losses, health and social inequalities. A number of European and US cities have implemented initiatives to promote multimodal modes of transport. In Latin America changes are occurring in public transport systems and a number of projects aimed at stimulating non-motorized modes of transport (walking and cycling) have already been imp...
Public Bicycle-Sharing Systems (PBSS), also known as self-service public bicycle systems, are available in numerous big cities in the world (Vélib' in Paris, Bicing in Barcelona, Call-aBicycle in Munich, OyBicycle in London, etc.). Since its inception, Bicycle-sharing programs have grown worldwide. There are now programs in Europe, North America, South America, Asia, and Australia. A still grow...
This paper investigates how the coordination of information infrastructures (II) emerges as a result of the dialectic between social and material agencies, whose interactions are tempered by both the objective and subjective flows of time. Drawing upon the theory of the Trichordal Theory of Coordination (Venters et al. 2014), the study explores the process of coordinating the development of par...
It is widely believed that urban ecological landscape regards the city to be an ecosystem built by human activities and supported by natural and man-made functions and processes over time. In the past, human communities have selected their residing places and designed their cities by paying attention to natural environmental resources. The profound influence of technology and industry has broug...
Before the modern era, cities were built on a scale that did not change the environmental balance significantly. With the expansion of population and the expansion of cities and the conversion of settlements into big cities and metropolises, new conditions have emerged which show that cities today make their own climates. The new climates created in these areas are completely different from the...
By shouldering the burden of a big chunk of global production, and giving Shelter to half of the world’s population, currently cities play an important role in national economies. Benefits of agglomeration in cities have played a major role in the process of economic development of different countries, however, the expansion of urbanization has produced some problems including environmental and...
materials and methods in this descriptive study, 2988 stool samples of patients with acute gastroenteritis were collected from children’s hospitals of 5 main cities of iran. the samples were sent in frozen condition to pediatric infection research center in tehran and stored at -70°c. elisa test was performed for detection of rotavirus antigens. the mean age of study population was 1 to 5 years...
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