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Friction and lubrication in artificial joints
Vocel, Jan ; Musil, Jan ; Šída, V.
The changes in function of artificial joint could be caused also by inconvenietn lubricant. At present time besides ionic fluids also some water soluble polymers and their derivatives have been investigated. Friction measurements using a technical frictional machine showed low coeficient of friction with negligible wear.
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Supermolecular arrangement in the development of pseudosynovial fluids
Štol, Miroslav ; Musil, Jan ; Pražák, Josef
Attention has been paid to sodium salt of carboxymethyl cellulose as a hyaluronic acid substitude. The latter substance has been modified by addition of some metalic ions. Measurements of dynamic viscosity of the NaCMC solutions revealed that bivalent metallic ions do not adequately crosslink polymer chains in an intermolecular fashion. On the other hand, some multivalent metallic ions (Mn or Ce) were active in crosslinking the polymer chains, thus forming their supermolecular arrangement.
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Coupling of the electrochemical and heart activity
Převorovská, Světlana ; Maršík, František
In the paper the numerical model of the electrochemical and mechanical heart activity which has been developed at the IT CAS is described. The generation of the cardiac action potentials and the ions transport through cardiac myocytes is modelled by the Beeler-Reuter equations. For the pressures generation in the heart the relation derived from the energy balance is used. The paper includes some results of the numerical simulation.
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