New areas explored

Solar activity explored with new wavelet methods

In order to improve the forecasts of the impact of solar activity on the terrestrial environment on time scales longer than days, improved understanding and forecasts of the solar activity are needed. The first results of a new approach of modelling and forecasting solar activity are presented. Time series of solar activity indicators, such as sunspot number, group sunspot number, F10.7, E10.7,...

Meifly: Models explored interactively

Why do we build models? There are two basic reasons: explanation or prediction (Ripley, 2004). Using large ensembles of models for prediction is commonplace, but is rarely used for explanation, where we typically choose one “best” model. When there are several equally good models, it is common sense to look at them too, but can the “bad” models tell us something as well? This paper describes ex...

New Areas in Fuzzy Application

New plans for wild areas

A move by the US government to preserve more public lands as wilderness has been welcomed by environmentalists but has angered ranchers, sportsmen and energy companies that fear access to land will be reduced. The new policy, initiated at the end of last year, directs the Bureau of Land Management to survey its vast holdings from Alaska to Arizona in search of unspoilt wildlife areas. The agenc...

New Insight into Cycloidal Areas

1. INTRODUCTION. A cycloid is the path traced by a point on the boundary of a circular disk that rolls without slipping along a straight line. It forms a sequence of arches resting on the line, as shown in Figure 1. It is known that the area of the shaded region below one arch is three times the area of the rolling disk. Our analysis shows that the factor 3 reflects a much deeper property of cy...