farm machinery managers often need to make complex economic decisions on machinery replacement. repair and maintenance costs can have significant impacts on this economic decision. the farm manager must be able to predict farm machinery repair and maintenance costs. this study aimed to identify a regression model that can adequately represent the repair and maintenance costs in terms of machine...

abstract the ancient history and culture of iran has been a main field of research for many writers in the contemporary times. among these writers is hushang golshiri. in many of his works, in fifth innocent and shazdeh ehtejab (prince ehtejab) in particular, he has paid great attention to history. the main question of the present study is to discuss how golshiri has dealt with story and myth i...

Let (Xn,i )1≤i≤n,n∈N be a triangular array of row-wise stationary Rd valued random variables. We use a “blocks method” to define clusters of extreme values: the rows of (Xn,i ) are divided into mn blocks (Yn,j ), and if a block contains at least one extreme value, the block is considered to contain a cluster. The cluster starts at the first extreme value in the block and ends at the last one. T...

The thriver model is a novel framework that unifies the concepts of posttraumatic and postecstatic growth. According to the model, it is not the quality of an event, but the way it is processed, that is critical for the occurrence of post-event growth. The model proposes that meaning making, supportive relationships, and positive emotions facilitate growth processes after positive as well as tr...

Stress in financial markets influences economic agents’ behavior by creating uncertainty and changing the expectations. Critical financial stress can lead to financial crisis. Financial crises are among the events always present in the world economy. Iran is not an exception. This paper aims to study the impact of financial stresses on Iran’s per capita GDP. By using ARDL (Auto Regressive Distr...

water is a valuable and irreplaceable element for the socio-economic development of countries. it is also the most important factor for the equilibrium of the ecosystem and environment. todays, several factors cause water problems and related issues around the world. governments and nations are always looking for the correct understanding of water issues and providing sustainable solutions to s...

Homocysteine is a sulfurated amino acid used for the synthesis of methionine. The last decade's researches proved that hyperhomocysteinemia is an independent risk factor for atherosclerotic vascular disease. The vascular injury induced by several mechanisms of hyperhomocysteinemia is the hallmark of homocysteine's atherogenic properties. Hyperhomocysteinemia is present in 85% of the patients wi...

Economists often use complex mathematical models to forecast the path of the U.S. economy and the likelihood of recession. But simpler indicators such as interest rates, stock price indexes, and monetary aggregates also contain information about future economic activity. In this edition of Current Issues, we examine the usefulness of one such indicator—the yield curve or, more specifically, the...

In spite of large number of financial crises, often depicted as episodes of financial panic, the notion of panic in financial markets is not very well understood. Many have argued that in order to understand financial crises, and in particular panic events, we need to go beyond classic economic arguments. This paper is an effort in that direction, in which we attempt to give a psychological acc...