Vernal Pools: Nature\u27s Laboratory

Vernal pools are described and discussed. The importance to wildlife and ecology is explained

Insights, Fall, 1995

Bi-annual alumni newsletter for the College of Science of Utah State University in Logan.https://digitalcommons.usu.edu/discovery/1020/thumbnail.jp

Mechanisms of failure of jointed rock masses and the behaviour of steep slopes

The geomorphological behaviour of steep jointed rock slopes has been studied using distinct element method computer models. In order to model steep slopes effectively, methodologies need to be combined from the studies of environmental modellers, geomorphologists and engineers. The distinct element method is ideal for the study of the development of jointed rock masses as the discontinuum approach can model the progressive failure of rock blocks along discontinuities. Initial, theoretical modelling identified the limiting boundary conditions between the multiple block failure mechanisms of toppling, sliding and toppling-and-sliding, based upon the discontinuity geometry for a theoretically modelled limestone rock mass. It is demonstrated that joint dip, friction angle and spacing exert the greatest control upon rock mass failure mechanisms. Two field locations, the Colorado Plateau and the Isle of Purbeck, have been chosen to provide a link between theoretical modelling and classic rock mass landforms which are controlled by variation in discontinuity geometry. In the Portland Limestone of the Isle of Purbeck, it is the joint geometry variation which influences development. Bedding steepens and average block size decreases in the coastal rock cliffs from east to west. Comparison between the model outputs highlighted that there is an increase in the rate of simulated cliff retreat from Winspit in the east to Durdle Door in the west. The Colorado Plateau rock cliffs form large, embayed plan-form escarpments and detached monoliths. It is the variation of joint set spacing in the cap-rock of cuesta-form composite scarps that controls development. Model results suggest there is a continuum of rock mass landforms, with buttes becoming detached at plan-form necks in the escarpment as determined by the joint geometry. The results show excellent similarity with the landforms observed in the field. This thesis introduces a research tool that can provide an understanding of slope behaviour

Annual Report Of Research and Creative Productions by Faculty and Staff from January to December, 1999.

Annual Report Of Research and Creative Productions by Faculty and Staff from January to December, 1999

Theorising about mathematics teachers' professional knowledge: The content, form, nature, and source of teachers' knowledge

The guiding philosophy of this theoretical work lays in the argument that mathematics_teachers’ professional knowledge is the integration of various knowledge facets derived_from different sources including teaching experience and research. This paper goes beyond_past trends identifying what the teachers’ knowledge is about (content) by providing new_perspectives, in particular, on how the knowledge is structured and organised (form), on_what teachers’ draw on their knowledge (source), and whether the knowledge is stable and_coherent or contextually-sensitive and fluid (nature)

Annual Report Of Research and Creative Productions by Faculty and Staff from January to December, 1998.

Annual Report Of Research and Creative Productions by Faculty and Staff from January to December, 1998