The control of pH is important in the chemical industry, poses a difficult problem because of inherent nonliniarities and frequently changing process dynamics. The work described in this paper aims at exploring a technique for producing adaptive fuzzy logic controller (FLC), in which a genetic (GA) is employed to alter membership functions. GA is an adaptive search technique based on natural se...

and partly results of my Ph. D. student Richard Cleyton. It is a pleasure to thank the Erwin Schrrdinger Institute and the organisers of the program on Holonomy Groups in Diierential Geometry for their kind hospitality.

Mixed culture anaerobic fermentation generates a wide range of products from simple sugars, and is potentially an effective process for producing renewable commodity chemicals. However it is difficult to predict product spectrum, and to control the process. One of the key control handles is pH, but the response is commonly dependent on culture history. In this work, we assess the impact of pH r...

1. The relationship between extracellular pH (pH,), intracellular pH (pH,) and lactate uptake was studied in the isolated perfused rat liver during simulated metabolic acidosis. 2. pHi fell to a considerably less extent than pH, when the latter was decreased from pH 7.4 to 6.7. 3. The liver took up lactate when pHi was greater than 7.0; at lower values of pH, lactate output occurred. 4. The rel...

In the last 30 years, bacteria have provided experimentalists with an easily manipulable system in which to study regulatory phenomena. This has led to a relatively clear understanding of the regulatory mechanisms which operate to control gene expression (35). However, with a few exceptions (e.g., chemotaxis, the control of enzyme activity) regulatory phenomena which primarily involve control o...

In this study, in-house extracted kidney bean protein concentrate (KPC) was treated with pH-shift (pH-S), combined ultrasound (pH-SU) or heat (pH-SH), and the structural, functional, interfacial properties of modified KPC were comprehensively evaluated. Upon treatments, increase surface hydrophobicity (H0) observed, intensity in order pH-SH > pH-SU pH-S control. The intrinsic tryptophan fluores...

In this work we propose a family of trajectory tracking controllers for marine craft in the port-Hamiltonian (pH) framework using virtual differential passivity based control (v-dPBC). Two pH models of marine craft are considered, one in a body frame and another in an inertial frame. The structure and workless forces of pH models are exploited to design two virtual control systems which are rel...