the manning roughness coefficient is an important parameter in the design and evaluation of furrow irrigation. despite its importance, estimation of this parameter for surface irrigation is very difficult, particularly in furrow irrigation. in this study, an evalue model was used to estimate the manning roughness coefficient in furrow irrigation. the model was based on volume balance and develo...

there are different methods for controling the flood damages which one of them is flood zoning. in this method, flood zones are determined by simulating river hydraulic behavior and its flood plain for different return periods.in other hand, soil and specially plant coverage are the most effective factor to determine manning roughness coefficient. so it is expected, seasonal plant coverage chan...

Characterized by moderate and almost unchanging microbial growth, stability is an essential aspect ofcompost quality Low growth rates give benign organisms a competitive advantage over pathogens such as Sulnronellu and &fhrurn, which thnve m high-growth-rate conditions (Inbar et al., 1990). Also, stability prevents nutrients from becommg tied up in rapid microbial growth, allowing them to be av...

Structure exists in sequences ranging from human language and music to the genetic information encoded in our DNA. This thesis shows how that structure can be discovered automatically and made explicit. Rather than examining the meaning of the individual symbols in the sequence, structure is detected in the way that certain combinations of symbols recur. In speech and text, these repetitions fo...

Recent evidence indicates an overall retreat from marriage. Cohabitation has contributed to this trend as cohabiting unions are increasingly not resulting in marriage. As an initial step in understanding why some cohabiting couples do not marry, we examine factors associated with cohabitors= marriage expectations. We focus particularly on the effects of socioeconomic status and race/ethnicity b...