Risk matrix features

A good risk matrix normally shows the following features ... 

The overall aim of this type of extrapolation is to predict exposure and/or effects from one medium or matrix to another. Although physicochemical (fate and exposure) and biological (sensitivity) extrapolations can be addressed separately, it will become clear in the following that there are many links between these elements of risk that can complicate the extrapolation process. The elements of the extrapolation process and the interactions between physicochemical and biological features that are involved are schematically depicted in Figure 2.1. 

At the risk of being redundant, we may state here the salient features of the TD-functional formalism. The first requirement is a variational principle, and for a time-dependent quantum description only a stationary action principle is available. With this a mapping theorem is established which turns the action functional into a functional of relevant physical quantities (which are the expectation values), and the condition of stationarity is now in terms of these variables instead of the entire density matrix. Thus the stationary property with respect to the density matrix now becomes one with respect to all the variables... 

Another feature of concentrated phosphoric acid solutions that is very important for fuel cells is the water vapor pressure, which decreases drastically with increasing concentration of the acid. This feature allows the phosphoric acid solution to be immobilized in a porous solid matrix, greatly simplifying the elimination of water as a reaction product from the fuel cell s cathode space by gas (oxygen or air) circulation. It is safe to adjust this circulation to the maximal current load (maximum rate of water production), without the need to readjust it at lower loads, as there is no risk of excessive drying of the matrix on account of the said feature. In this way, water elimination in phosphoric acid fuel cells has a peculiar self-regulation. No such feature exists in sulfuric acid solution, where for water elimination the acid itself would have to be circulated, which would cause problems of sealing and corrosion. 

For critical packages, potential risks will be included in software risk analysis and the coverage matrix will link some specific test cases with specific third party software features they exercise. 

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