Where variable speed pumping systems are under consideration for a specific application, such as for a wastewater lift station, designers and end users need to understand and take into account various factors and design criteria in order to make an informed decision. In this article from the USA, Charles G. Stolberg, Executive Director of the Submersible Wastewater Pump Association, describes some of the contributing components of the variable speed pumping system and how they interact with certain other components, and provides information to properly evaluate the advantages and disadvantages of applying such a design to submersible pumping equipment.
Research spanning more than two decades points to the benefits of vigorous collegial communities, yet relatively little research examines specifically how professional communities supply intellectual, social and material resources for teacher learning and innovations in practice. This paper examines the theory-building potential of audio- and videotaped records of situated interaction among teachers in the Hollister Outlet Canada
course of everyday work. The paper employs a small segment of a larger data set to chronicle analytic dilemmas and opportunities and to introduce a scheme for theorizing about the nature and significance of professional community for teacher Hollister Clothing For Cheap development and school reform.