Indicators Affecting the Urban Resilience with a Scenario Approach in Tehran Metropolis

Urban resilience refers to the capacity of an urban system to fully recover from unforeseen calamities. This study aims to assess the physical resilience indicators used to measure urban resilience in Tehran, the political and economic capital of Iran, and to pinpoint the most significant direct and indirect influences on urban resilience. The research process divided into two parts. The environmental scanning approach (reviewing papers and published sources, interviewing specialists, and monitoring conferences) and the literature review were employed in the first part to compile a database of the key information on the elements impacting physical resilience. The most significant factors impacting physical resilience over the next ten years were requested to be identified by specialists and intellectuals in the second part. Finally, the MicMac program was used to analyze the data after 29 variables were specified in Delphi. In light of the trace-analysis-dependence diagram, which depicts the instability of the influential factors and the persistence of their impact on other variables, the results demonstrate that Tehran’s physical resilience is in an unstable condition. According to the results, the factors that have the maximum impact on other variables are granularity drivers, emergency evacuation capacity, rescue and security spaces (emergency, fire station, and police station), impermeability, rate of the amendment and retrofitting measures in the buildings of each zone, building age, and the compatibility of land uses. The variables that are most susceptible to change from other variables include the distribution status of dangerous land uses, the quality of the buildings, the rate of historically vulnerable buildings, the vulnerability of internal and external roads, the rate of improvements and retrofitting measures in buildings in each zone, as well as historically vulnerable historical buildings

Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles

Warm mix asphalt (WMA) is gaining increased attention in the asphalt paving industry as an eco-friendly and sustainable technology. WMA technologies are favorable in producing asphalt mixtures at temperatures 20–60 °C lower in comparison to conventional hot mix asphalt. This saves non-renewable fossil fuels, reduces energy consumption, and minimizes vapors and greenhouse gas emissions in the production, placement and conservation processes of asphalt mixtures. At the same time, this temperature reduction must not reduce the performance of asphalt pavements in-field. Low aging resistance, high moisture susceptibility, and low durability are generally seen as substantial drawbacks of WMA, which can lead to inferior pavement performance, and increased maintenance costs. This is partly due to the fact that low production temperature may increase the amount of water molecules trapped in the asphalt mixture. As a potential remedy, here we use fumed silica nanoparticles (FSN) have shown excellent potential in enhancing moisture and aging susceptibility of asphalt binders. In this study, asphalt binder modification by means of FSN was investigated, considering the effects of short-term and long-term aging on the rheological, thermal, and microstructural binder properties. This research paves the way for optimizing WMA by nanoparticles to present enhanced green asphalt technology

A Study of Iranian New Towns During Pre- and Post Revolution

The present paper studies the objectives and functions of constructing the new towns before and after the revolution in Iran. Before the revolution, new towns were established based on political – bureaucratic objectives, for the operation of huge oil resources and affiliated industries, to accommodate the workforce in industrial complexes, to implement the policy of regional decentralization, to provide housing for the government employees, to attract the surplus population of large cities and to reconstruct the cities destroyed by earthquake. A type of economic and social development strategy was involved in establishing new towns. Although these towns function differently, they are mainly well-populated and active towns. After the revolution, fewer towns were planned. One of the strategies of urban development was to absorb part of the population of the overpopulated cities to provide housing to low-income groups, to accommodate employees of industrial sectors, and to decentralize anatomic and industrial sectors of large cities. Except the new town of Baharestan, which has achieved the 10-year objectives behind its construction for population and housing purposes, other towns which have merely succeeded to attract less population as they were planned, the new town have generally failed to achieve the 10-year envisaged goals and have converted into housing warehouses. At present these 17 new towns has been able to attract only 320548 persons while the three new towns of Ramin, Ramshahr, Tis, have not yet been successful to attract population

A Study of Iranian New Towns During Pre-and Post Revolution

ABSTRACT: The present paper studies the objectives and functions of constructing the new towns before and after the revolution in Iran. Before the revolution, new towns were established based on political -bureaucratic objectives, for the operation of huge oil resources and affiliated industries, to accommodate the workforce in industrial complexes, to implement the policy of regional decentralization, to provide housing for the government employees, to attract the surplus population of large cities and to reconstruct the cities destroyed by earthquake. A type of economic and social development strategy was involved in establishing new towns. Although these towns function differently, they are mainly well-populated and active towns. After the revolution, fewer towns were planned. One of the strategies of urban development was to absorb part of the population of the overpopulated cities to provide housing to low-income groups, to accommodate employees of industrial sectors, and to decentralize anatomic and industrial sectors of large cities. Except the new town of Baharestan, which has achieved the 10-year objectives behind its construction for population and housing purposes, other towns which have merely succeeded to attract less population as they were planned, the new town have generally failed to achieve the 10-year envisaged goals and have converted into housing warehouses. At present these 17 new towns has been able to attract only 320548 persons while the three new towns of Ramin, Ramshahr, Tis, have not yet been successful to attract population

Monitoring Social Well-Being in Iran

The main aim of this study was to design a system for measuring and monitoring social well-being in Iran, utilizing a conceptual model and choosing contextually specific domains and indicators. A number of different approaches in defining and measuring social well-being exist. Some of these measuring systems use a descriptive approach and employ sets of indicators, which cover topics of concern but lack any explicit theoretical basis. To better capture the specific societal context of social well-being within Iran, we constructed a compound model from multiple pre-existing conceptual models, allowing us to group indicators and show relationships among contextually relevant areas and domains. Our framework proposes that there are societal and individual-level determinants that affect social health in a society and that social health has outcomes and impacts. To measure social health, variables of social integration, social contribution, social coherence, social actualization, social acceptance, social support, and social functioning are considered. The outcomes and impacts are to be measured and monitored by 37 variables. In many countries, social well-being measurements have been conducted on a regular basis for decades. Some of these systems of social health focus on individual (micro) measures, some on societal (macro) measures, and many on both. In this research, both individual level and societal level well-being measures were selected after being deemed contextually important for Iran. This system of social well-being measurement is to be used as a descriptive and monitoring tool but could potentially be utilized in goal setting, outcome-based accountability, and evaluations in order to promote social well-being and social policy research in Iran. © 2015, Springer Science+Business Media Dordrecht