A project which incrementally extends pbrt is described. Example scenes showing Fresnel reflection, isotropic absorption, and pleochroism in the gemstone tourmaline are presented. Tourmaline is typical for absorption characteristics in crystals, characteristics which often vary with wavelength and direction. Interesting color and intensity variation results from splitting incident rays, by pola...

This article puts the case for a new and evolving research approach or orientation „facet methodology‟, developed in collaborative team based working at Realities at the Morgan Centre, a „Node‟ of the UK National Centre for Research Methods. Research fields are seen as constructed through combinations and constellations of facets as we might see in a cut gemstone, where facets refract and inten...

Active object-oriented concepts are especially useful in the area of nonstandard applications in order to express an event-driven and constraint-driven system environment. Several attempts have been made to integrate active concepts into object-oriented databases. Current approaches to active object-oriented database systems, however, do not consider the various active concepts together with so...

Recently much work has been done towards extending object-oriented database systems (OODBs) with advanced tools such as view technology, advanced schema evolution support, and role modeling systems. These extensions all require that the underlying database system supports more powerful and exible modeling constructs than are currently supported by existing OODB systems. In this paper, we identi...

Nanomineralogy is the study of Earth and planetary materials at nanoscales, focused on characterizing nanofeatures (like inclusions, exsolution, zonation, coatings, pores) in minerals and rocks, and revealing nanominerals and nanoparticles [1]. With advanced high-resolution analytical scanning electron microscope, we are now capable to characterize solid materials easier and faster down to nano...

The gypsum mineralization occurred in the form of Satin Spar and Selenite in the south and southwest of the Fars province in the folded Zagros zone. In this region, Satin Spar mineralization has been formed as stratiform between the red marl and siltstone units of Late Miocene–Pliocene in Agha Jari, Bakhtiari, and the Gachsaran formations. The reserves of Satin Spar in this area are at least 20...

Several objects exhibit collaborative behavior if they act together in answering a message they have received jointly. Collaborative behavior is deened by cooperation contracts which are established between several object classes and which declare a set of cooperative methods. A cooperative method is invoked by a cooperative message sent to a tuple of instances, one for each object class in the...

Artisanal and small-scale gemstone miners are the workers with the highest health risk exposure in Tanzania. Gemstone mining at Merelani tanzanite mines which has gone to depths of 100 m or more in narrow straight and inclined shafts, underground artisanal miners work under a very harsh environment. Tanzanite deposits are located within sheared zones, lying along a deepseated Lelatema fault zon...