let  $r$ be a commutative noetherian ring and $i$ be an ideal of $r$. we say that $i$ satisfies the persistence property if  $mathrm{ass}_r(r/i^k)subseteq mathrm{ass}_r(r/i^{k+1})$ for all positive integers $kgeq 1$, which $mathrm{ass}_r(r/i)$ denotes the set of associated prime ideals of $i$. in this paper, we introduce a class of square-free monomial ideals in the polynomial ring  $r=k[x_1,ld...

today, the discussion of regularity monetary policy in achieving inflation and output gap stabilization is important. in this paper, we investigated the persistence of the output gap in iran economy and then by using a hybrid new keynesian model based on quarterly data for 1990:1- 2011:3. we compared three alternative instrumental rules in monetary policy for iran economy. the results indicated...

This paper uncovers an increasing proportion of quoted UK companies omitting cash dividends. Using a large panel of quoted UK companies, we estimate models for the incidence of dividend omissions and cuts as functions of financial characteristics including cash flow, leverage, investment opportunities, investment and company size. These variables account for most of the increase in omission sin...

Forestry decreases the amount of dead wood, thereby threatening the persistence of many saproxylic (wood-living) organisms. This article discusses how targets for efforts to maintain and restore dead wood in managed forest landscapes should be defined. Several studies suggest extinction thresholds for saproxylic organisms. However, because the thresholds differ among species, the relationship b...

The empirical literature on monetary policy shocks documents that contractionary shocks are followed by a persistent rise in interest rates and a persistent fall in output. Standard monetary business cycle models can account for the initial effects of monetary shocks, but have difficulty generating persistence. In this paper, I examine whether frictions that affect the asset allocation decision...

Disaster-tolerant systems are complex and expensive constructions that have hitherto been the provision of only the very rich or the very scared. The current state of the art for surviving site-wide failures is to mirror persistent storage to a remote location and cold-start applications there in the event of failure. This requires delicate, tailored modifications to production software to rest...

Increasing both user enjoyment and persistence, or engagement, is a challenge in ITS development. The current study investigates engagement in ITSs through the implementation of games and game-based elements. To investigate this possibility, we use both a physical version and a computerized version of the same educational board game. We compare user experience and reading strategy data for the ...

T his paper investigates the asymmetric behavior of inflation. We use logistic smooth transition autoregressive (LSTAR) model to characterize the regime-switching behavior of Iran’s monthly inflation during the period May 1990 to December 2013. We find that there is a triple relationship between the inflation level, its fluctuations and persistence. The findings imply that the behavi...

The evolution of cooperation is possible with a simple model of a population of agents that can move between groups. The agents play public good games within their group. The relative fitness of individuals within the whole population affects their number of offspring. Groups of cooperators evolve but over time are invaded by defectors which eventually results in the group’s extinction. However...