in the present  paper electrical conductivity (ec) of colloidal gas aphron (cga) suspensions was measured for anionic and cationic surfactants (sodium dodecyl sulfate (sds) and tetradecyl trimethyl ammonium bromide (ttab)). experiments were made for different concentrations of sds (6, 8.1, 10 mm) and ttab (2, 3.51, 5 mm). cga drainage behavior was observed and measured using 1 liter measuring c...

wheat straw, as an animal feed source, is of a low nutritional value, which can be enriched through a process of urea treatment. this process is the rewetting of the straw to the point of increasing its moisture content up to 30-50 percent using urea solution. the conventional method of treatment is a laborious, tedious and time consuming task. to facilitate this process some of these operation...

designing effective strategies for sediment management and control is closely related to identification of sediment sources in a drainage basin. one of the methods for investigating sediment sources is using magnetic tracers for erosion and sediment yield studies. sediment source identification using magnetic characteristics is a simple, inexpensive, quick and non-destructive method having appl...

: Picture yourself as a researcher in immunology. To begin your project, you ask a question: Do CD8 T cells require antigen to maintain a memory response? This question is of prime importance to numerous medical fields. In chronologic order, you digest the literature, but unfortunately, you hit a major stumbling block in the 1990s. The crux of the problem is that which so often happens in scien...

Department of Life Sciences, Imperial College London, Ascot, Berkshire, United Kingdom Centre for Ecology and Hydrology, Wallingford, Oxfordshire, United Kingdom Department of Ecology, Evolution, and Behavior, University of Minnesota, 1987 Upper Buford Circle, Saint Paul, Minnesota, 55108, USA Department of Life Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK The Exelixis La...

This paper is concerned with some limited aspects of the history of two programming languages purpose-designed for students learning to program digital computers: Basic and Logo. The focus is the very different educational aims and philosophies of the originators of these languages. They are compared and their early use in schools sketched. While the reasons for teaching students to write progr...