This study investigated the role of the principal in managing teaching and learning. It examined how and to whom principals distributed the management of teaching and learning.  It was found that participants thought principals could improve school effectiveness most by engaging in activities that develop a good climate and ensure appropriate resources are available for instruction. There is a ...

objective: in this article, a numerical study is conducted on mixing of two fluids in the liquid phase with two different concentrations of a chemical species in the electro-osmotic flow. methods: the base liquid is an electrolyte which flows in a two-dimensional micro-channel having electrically charged walls. lorentz electric force, which is used as stimulating flow factor, is created by appl...

Described in this paper is a computer system, RESEARCHER, beine: develoDed at Columbia that reads natural languagk text-in th(? form of patent abstracts and creates.a permanent long-term memory based on concepts generaliz+ from these texts, forming an intelligent mformatlon s stem. This pa er is intended to give an overview of RESEARCHER & e will describe briefly the four main areas dealt ’ wit...

W investigate the role of potential weekly brand-specific characteristics that influence consumer choices, but are unobserved or unmeasurable by the researcher. We use an empirical approach, based on the estimation methods used for standard random coefficients logit models, to account for the presence of such unobserved attributes. Using household scanner panel data, we find evidence that ignor...