مطالب

Two important points have been the motivations of the writers of this article. The first motivating factor is the importance of the Neolithic Period especially the phase of shifting from Epi-Paleolithic to Neolithic in nowadays archaeological argumentation. The second factor is the importance of Khorramabad valley at the Paleolithic period and the abundance of early Chalcolithic sites and having no knowledge about the valley’s archaeology in Neolithic Period. Exploring two important sites namely Roāhol and Merijelo and finding three sites namely Sarab Kotela, Kohele and Kharmanjā Haft Cheshmeh in this valley, have opened promising horizons for archaeologists to understand the cultural changes of the Neolithic period. Surveying the surface findings and studying on the settlement layers of these sites have provided an opportunity for initial recognition of the existence of social life in Neolithic period in the valley. The general archaeological researches on central Zagros and specific researches on Khorramabad valley and also identifying and preliminary surveying of two under- discussion sites have created a proper opportunity for proposing a new mission to excavate the sites and to conduct systematic compact survey on Khorramabad valley. This article reviews the literature of archaeological studies on central Zagros and Khorramabad valley briefly and propounds the theories of beginning of food production and Neolithisation, proposes key questions and presupposition corresponding to the writers’ suggestive plan.

In new issues of durable architecture, it is tried to decrease negative effects of new architecture on environment. What is perfectly obvious is making the elements homogenous to their climatic function which was the art of our antecedents. Implementing the windward construction technique, our antecedents have well used the raw and uncontrolled flows of wind. They handled the wind and made it mild, remove the dust and created mild air-conditioning which represents the past environmental stability of Iranian architecture. Using the windward had been conventional in Iran since many years ago. Without any dependence on any kind of energy and without exploiting establishment appliances, it provides the coldness of residential places. This is the same issue on creating stability in environments where humans live in. In this research, the capabilities and limitations to use windward in salt desert's cities of Iran during today's age in were assessed to achieve some criteria quantitatively and qualitatively to enhance the windward and to provide the necessary ground for more efficient use of it. This research is of descriptive- analytical kind. Statistical population of this research includes university professors and architecture authorities in Iran. 30 persons of them were questioned directly. After survey data collection through the questionnaire, the relationships between research variables were tested by implementing swot technique. The obtained results suggest a windward in order to solve the weaknesses of previous air traps parallel to today's need. It indicates that giving the efficiency again to the windward’s by creating some changes in it proportional to today's need of users and in order to enhance its efficiency, provides the conditions to achieve some parts of a sustainable architecture.

This paper investigates the asymmetric effects of monetary policy on economic growth over business cycles in Iran. Estimating the models using the Hamilton (1989) Markov-switching model and by employing the data for 1960-2012, the results well identify two regimes characterized as expansion and recession. Moreover, the results show that an expansionary monetary policy has a positive and statistically significant effect on economic growth during recession, in expansionary regimes while the effects are stronger during recessions than expansions as predicted by finance constraints models. By using time-varying transition probability Markov-switching models, the results also show that an expansionary monetary policy raises the probability of switching from a recession to an expansion but reduces the probability of switching from an expansion to a recession. Keywords: Monetary policy, Business cycles, Asymmetry, Markov-switching. JEL Classification: E52, E32, G10