Robert Perrin
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Geometry of an English Church Bell Open
The axisymmetric geometries of both internal and external profiles of church bells, along with the properties of the bell metal, are of vital importance to their acoustics. The role of “golden geometry” in determining the visual characteri…
Groundwater-Driven Evolution of Prebiotic Alkaline Lake Environments Open
Alkaline lakes are thought to have facilitated prebiotic synthesis reactions on the early Earth because their modern analogs accumulate vital chemical feedstocks such as phosphate through the evaporation of dilute groundwaters. Yet, the co…
A scaling relationship for the width of secondary deformation around strike-slip faults Open
Simple mechanical arguments suggest that slip along interlocked, rough faults, damages surrounding rocks. The same arguments require that the scale of secondary damage is proportional to the size of geometric irregularities along the main …
THE ACOUSTICS OF THE GEMSHORN Open
INTRODUCTIO NThe resurgence of interest in medieval music has led to a revival also in the making of many long-abandon ed instruments such as the gemahorn.which is a traditional folk recorder dating back to before 1300 A.D. It ceased to be…
THE NORMAL MODES OF CYMBALS Open
1we described an investigation into the normal modes of an 18 inch crash cymbal. Various experimental methods were used in turn including electronic speckle pattern interferometry (ESPI), laser vibrometry and Chladni sand patterns as well …
View article: STUDIES WITH A SMALL GAMELAN GONG
STUDIES WITH A SMALL GAMELAN GONG Open
A gamelan is an ensemble of ethnic musical instruments from parts of Indonesia where it is central
to musical art and commands huge respect. It is also found in some neighboring countries. While it
involves many different types of instrume…
A simplified down-hole method for monitoring an engineered hydraulic barrier using electrical resistivity tomography Open
In the Athabasca Oil sands in Northern Alberta one of the major risks to mining operations is water infiltration from a saline aquifer at the base of the oil sands. One method of preventing infiltration is by the use of a freeze wall surro…