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function of time. These time profiles asymptotically reach a plateau value and may or may not have a discernable lag-time and/or initial slow release phase (Fig. 15). The shape of the curve may vary depending on the relative importance of each of the factors, but in general, the cumulative amount released asymptotically reaches a value in the end. |
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There are several equations that can be used to mimic this process, each with its own set of parameters that carry with them almost the entire profile of information encoded within the framework of the system and the confines of the questions asked of (or by) the theory. To date, many models developed with the assistance of the computer have resulted in mathematical expressions |
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