Computer-generated subsystems

The Vessel System, including the support subsystem, is analyzed using the NSSS finite-element model and response spectra input generated by the plant seismic analysis discussed in Section 3.7.2. This three-dimensional finite-element model is based on the Vessel System arrangement and is shown in Figure 3.7-6. The analysis is performed using the ANSYS computer code and the analysis procedures discussed in Section 3.7.3.1.1. (Ref. 11)... 

Within the external interfaces, the behavior of the computer system (or subsystem) is defined and constrained by the computational model. The model allows an application to be described using processes and shared state data. Each process is event-triggered. Once released it may read input state data from the system s interface, write data to different elements of the interface, read and/or write to shared internal data, or generate events for external consumption via the interface or internally to trigger the release of a local process. The shared data, as the name implies, are used for communication between processes. The implementation model must ensure atomic updates to shared data. 

The careful selection of an integration algorithm is not the only means of conserving computer resources in molecular dynamics. In this section we shall discuss two devices that can save a significant amount of computer time during the generation of a phase space trajectory equilibration on subsystems and bookkeeping. 

The Process Computer System provides performance monitoring and control, and power generator control subsystem functions to provide efficient plant operation and automation. 

This section describes a proposed methodology to evaluate the environmental impact of a chemical industrial process chain in the most accurate way possible. It includes a procedure to compute the LCI based on the concept of eco-vectors [Sonneman et al., 2000], Each process stream (feed, product, intermediate or waste) has an associated eco-vector whose elements are expressed as Environmental Loads (EL, e.g. SO2, NOJ per functional unit (ton of main product). All input eco-vectors, corresponding to material or energy streams, have to be distributed among the output streams of the process (or subsystem). In this sense, a balance of each EL of the eco-vector can be stated similarly to the mass-balance (input = output + generation ). This is the reason why all output streams are labelled as products or emissions. The eco-vector has negative elements for the pollutants contained in streams that are emissions and/or waste. Figure 1 illustrates these ideas for an example of a chain of three processes that produces a unique product. The proposed procedure associates inventory data with specific environmental impacts and helps to understand the effect of those impacts in human health, natural resources and the ecosystem. 

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