The bacterial senate, luminous mini-cephalopods and other tales. Everybody intuitively knows what a bacterium is. However, how deep our understanding actually is in fact? The phenomenon called Quorum sensing has shown us that bacterial intra-specific as well as interspecific or even inter-kingdom communication is much more sophisticated field of research then we ever thought.
I moderní alaboratorně náročné metody dávají velmi omezenou možnost stanovení druhové struktury bakteriální složky vodních společenstev. Jejich popis tedy nemůže být identický se společenstvy rostlinnými nebo živočišnými. Rozhodující roli ve struktuře i funkci bakteriálních společenstev hrají podmínky prostředí, na které mohou společenstva reagovat vedle selekce také adaptací na genové úrovni. Významná je interakce s ostatními složkami systému – primárními producenty a konzumenty, kteří regenerují zdroje organického uhlíku. and Even modern methodology with sophisticated laboratory equipment offers only a limited opportunity to identify the species structure of the bacterial component of water communities. Thus it cannot be described in the same way as plant or animal communities. Environmental conditions play a decisive role in the structure and function of bacterial communities. Interaction with other components of the system – primary producers and consumers, which regenerate sources of organic carbon, is important as well.
The paper deals with the modelling of balancing machine vibration and the identifícation of the stiffness and damping coefficients of oil-film bearings. The real balancing machine consists of a flexible rotor, oil-film bearings and bearing heads on spring elements. The mathematical model enables to calculate eigenvalues, critical revolutions and unbalance vibrations in dependence on the rotational speed. The identification method of the oil-film bearing stiffness and damping matrices is based on the minimization of differences between measured and calculated rotor critical speeds and bearing head displacements in balancing machines. The rotor is excited by attached known trial masses fixed in chosen balancing planes. and Obsahuje seznam literatury
This paper deals with the modelling and control of balanced wheeled autonomous mobile robot. For the MBS dynamics modelling software tool Matlab-SimMechanics is used. The model derived automatically from geometric-topological description of MBS is used for the control purposes (local linearization for state space control, testing of nonlinear system controlled by LQR) and also as a reference during the analytical model formulation for global feedback linearization. The dual accelerometer is used as a tilt sensor and the proposed method for sensory processing is described in this paper. The approach is based on iterative solution of nonlinear equation. Control using the state space (LQR) and the feedback linearization is compared. Also, the influence of sensor noises and delays implemented into the model are discussed. Finally, the solution is verified on real physical model controlled by means of hardware ni the loop (HIL). and Obsahuje seznam literatury