natural plant extracts / products have the potential as safe alternatives for chemical fungicides in plant disease management. methanol and pure methanol: water (50:50 v/v) extracts of peppermint, lavandula, eucalyptus, datura and nettle were screened for their antifungal activity against alternaria sesami, the causal agent of alternaria leaf spot of sesame at 5, 10 and 15% concentrations in sh...

the impact of installing process control systems can be expected in terms of performance improvements through reduced operating costs.  since these installations impose considerable capital expenditure, the profitability of the new systems should be economically justified. controlled variable trend was reconstructed by a combination of simple waves, which provided a means to simulate the effect...

Gain scheduling is one of the most popular nonlinear control design approaches which has been widely and successfully applied in fields ranging from aerospace to process control. Despite the wide application of gain scheduling controllers, there is a notable lack of analysis on the stability of these controllers. The most common application of these kinds of controllers is in the field of fligh...

Oscillations are a common type of plant-wide disturbances whose effects propagate to many units and thus may impact overall process performance. It is important to detect and diagnose such oscillations early in order to rectify the situation. Many frequency domain tools such as the power spectrum and spectrum envelope methods are capable of detecting the oscillation frequency. However, few meth...

The total sales of biopharmaceuticals have been steadily increasing for decades with growing approval of new drug products, especially for monoclonal antibodies. This trend motivates the development of deeper understanding and advancement of biopharmaceutical manufacturing operations. This article describes opportunities, needs, and challenges in process control and operations for biopharmaceut...

Implementation of Information and Communication Technology (ICT) enabled wireless control systems to manage plant operations are growing far and wide. Several ICT enabled wireless remote open loop systems such as wireless transmitters, control valves and smart sensors are available now. However, such systems are not yet introduced in the control of processes. In this work, authors attempt to ch...

The generation of plant models for simulation is in general a task for modelling experts which are seldom available during the engineering process of a plant. The paper proposes an automatic model aggregation concept which provides the planning engineer with a simulation model at the end of the plant engineering process, such that he can test and debug the plant functions by simulation before i...