abstract potential evapotranspiration is one of basic parameter in hydrologic cycle that should be estimate in irrigation design and scheduling, watershed hydrology studies. many applications in diverse disciplines require estimates of evapotranspiration (et) at hourly or smaller time steps. the primary objectives of this study were to compare the american society of civil engineers (asce) and ...

For years, the principal objective of evapo-transpiration research has been to calculate the loss of water under varying conditions of climate, soil, and vegetation. The early simple empirical methods have generally been replaced by more detailed models which more closely represent the physical and biological processes involved. Monteith's modification of the original Penman This paper is not s...

This is an important book. On the surface, it is a survey and summary of work related to a major computational linguistics effort--the Penman project at the University of Southern California. Beneath the specific title and the apparently narrow subject matter, however, lies a general point about the field of computational linguistics: many important aspects of language are not addressed by the ...

In contrast, the exponential decay of an enzyme protein in vivo is a process resulting from the dynamic synthesis and degradation of proteins and presumably independent of the stability of its RNA template. For example, the half life of the enzyme serine dehydrase is about 3 hr, whereas the lifetime of the template RNA for serine dehydrase appears to be at least 6-8 hr. 18 Penman, S., K. Scherr...

This paper compares evapotranspiration estimates from two complementary satellite sensors - NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) and ESA's ENVISAT Advanced Along-Track Scanning Radiometer (AATSR) over the savannah area of the Volta basin in West Africa. This was achieved through solving for evapotranspiration on the basis of the regional energy balance equation, which wa...