The consecutive heat wave and heavy rainfall (CHWHR) events, defined as the occurrence of waves followed by rainfall, can cause more damages than individual extremes. Nevertheless, this type compound event has not been diagnosed systematically. Here we examine CHWHR events underlying characteristics. We find 22% land areas experienced statistically significant within 7 days in China during 1981...

an important and fundamental issue in iran is to utilize water and to avoid wasting it. therefore, climate change can be considered as an effective factor on water resources. the most tangible climate change phenomenon is drought which is much important to be identified. in this study, the effect of climate changes on flow rate in bashar river, shahmokhtar station of yasouj city was evaluated u...

the main idea of this paper is to study the dependence between the probability of default and the recovery rate on credit portfolio and to seek empirically this relationship. we examine the dependence between pd and rr by theoretical approach. for the empirically methodology, we use the bootstrapped quantile regression and the simultaneous quantile regression. these methods allow to determinate...

Extended Abstract. When the comprehensive information about a topic is scattered among two or more data sets, using only one of those data sets would lead to information loss available in other data sets. Hence, it is necessary to integrate scattered information to a comprehensive unique data set. On the other hand, sometimes we are interested in recognition of duplications in a data set. The i...

hydrological drought analysis using sdi index in halilrud basin of iran abstract nowadays, drought is considered as damaging environmental phenomenon which affects natural resources and social communities. therefore it will be an important issues that magnitude and effects of these phenomena to be considered. to do this we used l-moment method for regional homogeneity testing. the streamflow dr...

climate change phenomenon is an important environmental challenge of the world. increasing extension of greenhouse gases and remote relationship phenomena accelerate the speed f climate change. changes in precipitation level, drought occurrence and changes in the level of surface and groundwater resources are the recognized consequences of climate change. in order to study consequences of clima...

the frequent occurrence of currency crises in recent years brought the early warning literature back in the researchers spotlight. in recent years, concept of an early warning system (ews) developed that should be able to identify various costly events, such as currency crises, early enough for policy makers to reduce the costs. this study attempted by using iran's economy quarterly data d...