Most of these problems were presented at the problem session of the 18th British Combinatorial Conference at the University of Sussex, 2–6 July 2001. I have added some problems given to me after the session. Since two of the problems concern circular chromatic number, the entire set has a circular structure; the starting point is fixed by the sixth problem. Problem 1 (BCC18.1) Freese–Nation num...

The proposed method for calculation of potential evapotranspiration is Penman-Monteith FAO method, but there are other methods that require less meteorological data but estimates close to the FAO Penman-Monteith method in different climatic conditions.  Performance evaluation of these methods on the same basis is prerequisite for selecting an alternative approach in accordance with available da...

Determination of crop water requirement is one the key parameters for precise irrigation scheduling, especially under limited resources, such as in Egypt. Hence, an accurate estimation reference evapotranspiration (ETo) a vital factor agriculture production, therefore objectives present study were to influence climate change on different seasons and comparing ETo estimations using Blany- Criddl...

A evapotranspiração de referência (ETo) é importante para a agricultura irrigada e sua relação com o Kc da cultura determina Evapotranspiração (ETc). Organização das Nações Unidas Alimentação Agricultura (FAO) determinou como padrão método Penman Monteith estimativa ETo, porém existem diferentes fórmulas empíricas tal aplicação, sendo assim presente trabalho tem objetivo avaliar referencia por ...

Prediction of potential evapotranspiration (PET) using an artificial neural network (ANN) with a different architecture is not uncommon. Most researchers select the optimal statistical indicators. However, there still gap to be filled in future applications various drought indices and assessment location, duration, average, maximum minimum. The objective was compare performance PET computed ANN...

The impact ofmodel structure andparameterization on the estimation of evaporation is investigated across a range of Penman–Monteith type models. To examine the role of model structure on flux retrievals, three different retrieval schemes are compared. The schemes include a traditional single-source Penman– Monteith model (Monteith, 1965), a two-layer model based on Shuttleworth and Wallace (198...