Abstract: Systems and methods are provided for identifying and displaying dependencies. One aspect of the invention comprises a system having a dependency parser that parses components of a system with dependencies and generates a plurality of component dependency pairs associated with the components, and a component dependency graph generator that generates a dependency directed graph from the plurality of dependency pairs. The system further includes a component levels and cycles analyzer that traverses the dependency directed graph to identify dependencies, strong components and component dependency levels associated with the dependency directed graph, and a graphical user interface that provides a tree view illustrating a dependency tree of the identified dependencies over the identified component dependency levels.

Abstract: A gas monitor includes an infra-red source enclosed within a housing having inner surfaces which are reflective. Radiation emitted from the source reflects off ellipsoidal surfaces and intermediate planar surfaces to be focussed at a sensor, being reflected five times. Radiation is absorbed by gas within the housing and a comparison of the source intensity and detected intensity gives a measure of the gas concentration. Use of ellipsoidal reflective surfaces directs emitted radiation along a plurality of routes having substantially the same path length, hence giving an accurate measure of the gas concentration with a compact device. In another embodiment, off axis parabolas are used to direct the radiation through the gas.