Ambient Obsurance Baking on the GPU

Ambient Occlusion and Ambient Obscurance are coarse approximations to global illumination from ambient lighting, commonly used in film and games. This paper describes a system that computes Ambient Obscurance over the vertices of complex polygon meshes. Novel contributions include pre-processing necessary for “triangle soup” scene representations to minimize artifacts, a compact model for different classes of instanced decorator objects such as trees and shrubs, a compact model for pre-computed visibility to be used on dynamically placed objects, and an approximation to model the occlusion of small decorator objects when ray tracing

Micro-bore Column Fast Gas Chromatography-Mass Spectrometry in Essential Oil Analysis:

The present research is focused on the use of micro-bore column fast gas chromatography in combination with rapid-scanning quadrupole mass spectrometry for mediumly-complex essential oil analysis. A basil essential oil sample was initially subjected to conventional GC-MS (analysis time: 25 min) under optimum analytical conditions. Peak identification was carried by using a dual-filtered MS library search procedure: the first filter deleted "hits" with a less than 90% spectral similarity, while the second filter eliminated matches with a linear retention index (LRI) outside a pre-defined LRI window. The same essential oil sample was analyzed under optimized fast GC-MS conditions by using a micro-bore column, with the same aforementioned MS library search process (analysis time: 5.3 min). Resolution was altogether similar in both applications, with the same number of compounds reliably-identified, namely fifty-nine. The experiment demonstrated the usefulness of the rapid GC approach in this type of experiment

Two-dimensional chromatography. Foreword

Especial issue on New Trends in Tow-dimensional Chromatography Techniques.Peer Reviewe

Comprehensive 2D GC Methodologies for the Analysis of Lipids

peer reviewe

Comprehensive 2D GC Methodologies for the Analysis of Lipids

peer reviewe

Three gurus of comprehensive chromatography

Interview.With the 42nd ISCC and 15th GC×GC Symposia soon rolling into Riva Del Garda, we grill three superlative separation scientists on the progress – and pitfalls – of comprehensive chromatographic techniques.Peer reviewe