In order to assess the shelf life of rubber components stored under various conditions, a series of experiments at elevated temperatures was carried out, and the effects on mechanical properties were measured. These were then analysed according to the Arrhenius equation, and limits to the length of
time during which components may be stored Air Presto at practical temperatures were estimated. The effect of the deterioration in quality on the service life was described.
Mixing, in general, is an irreversible process, and some entropy is generated and thus some exergy is destroyed during such a process. Therefore, combining two systems thermodynamically that are at different states may yield a system that is larger in size, but much smaller in exergy content or “usefulness”. In this paper we consider some mixing processes, and show that getting bigger is not necessarily better by examining the effect of mixing on exergy destruction.
A stereotaxic apparatus for young rats is described. Fixation pieces are simple, producing no trauma. They assure precision for stereotaxic studies and chronic implantation of electrodes.RésuméUn appareil de stéréotaxie destiné aux petits animaux en croissance est décrit. Les éléments de contention sont simples, n'apportant pas de traumatismes. Ils fournissent une précision correcte pour Womens Nike Roshe Run Trainers
une étude stéréotaxique et la mise en place d'électrodes chroniques.