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In many biotechnological processes it is important to perform exactdosing of the substrate into the bioreactor. The idea in this paper is to use the measurements from a balance to control the flow rate, since there is no access to the flow itself. The goals of the controller are several: it should be capable of handling load disturbances acting on the pump, measurement noise and even shocks acting
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Det är inte konstigt att många efter den arabiska våren har talat om både Turkiet och Sverige som samhälleliga förebilder, skriver Umut Ozkirimli och Spyros A Sofos.
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This paper concerns the proper definition of embeddings in purely category-theoretical terms. It is argued that plain category theory cannot capture what, in the general case, constitutes an embedding of one structure in another. We discuss three available solutions to this problem: variants of monics, concrete categories, and allegories. The first and last of these are found to be unable to solve