Maturation temperature/time control

Several plant parameters are important to the design of ET landfill covers. Among the most important are parameters describing rooting depth, leaf-area-index (LAI), temperature requirements, time to maturity, and water requirements. Models that are suitable for use in design of ET covers will utilize these parameters. The quality of the plant model controls the quality of AET estimates. 

This is one of the most common operations of practical alchemy and is simply allowing a material to incubate at a constant temperature for some period of time. The time period will vary depending on what is needed to occur and the temperature may need to be slowly increased over a lengthy course of digestion, but the idea is to provide a heated environment for the matter to react within or to slowly mature like hatching an egg. The whole of the Art is a controlled digestion. 

For diagnostic purposes, relevant parameters are collected and logged into the control system in order to determine appropriate maintenance periods and its service timing. For example, noise and vibration can serve as indicators of the status of health for a polisher. Large pressure and temperature valuations may provide alarms for malfunctions or problems within fluid lines. Such techniques have been developed and implemented in other technical fields, such as power generation machinery. The adoption of these mature technologies significantly improves the uptime of CMP system. 

A general model of the diagenesis of the sandy reservoirs of the Sahara is presented in Fig. 4.17. The sequence of the diagenetic stages is controlled by temperature and time. Vitrinite reflectance in shales adjacent to or intercalated with the quartz sandstones indicates their exposition in time and space to temperature and may be used also as an indicator of the thermal maturity of the quartz sandstones. In this way the vitrinite reflectances correspond to the stage of mesodiagenesis. Mechanical compaction dur-... 

Temperatures within the sedimentary section calculated as a fimction of time are used to estimate the maturation level of the organic matter. The kinetic model of vitrinite maturation (Sweeney and Burnham 1990) is the primary method of maturity estimation. Comparison of measured vitrinite reflectance Rg) with the calculated values and present-day temperature profile (Fig. 6.6) is used to control modeling parameters. The time-temperature index (TTI) (Lopatin 1971 Waples 1980) is also computed as a simple method to describe the paleothermal regime. 

Although the database for the thermal changes in laboratory controlled experiments supplies some indication as to the mechanisms involved, we are stUl far from the detailed pathways for the geological maturation of sulfur-rich kerogens. Despite the advent of analytical methodology, we still do not know if the use of elevated temperatures to compensate for the long geological times is completely valid. 

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