Success-avoidant behaviour

An improved nitridation process of Si in a rotary tube furnace allows a better control of the exothermic reaction, avoids overheating and agglomeration [192], is faster and results in smaller crystallites. Those powders have an improved sintering behaviour and after sintering a more favourable microstructure compared to powders produced by a batch process [192], Recently successful fast nitridation in a fluidised bed reactor was realised in laboratory experiments [194]. 

The main model elaborated for the EIS, shown in Fig. 14, contributed to avoid the opening of a cave in the SCI area Talpina (Site of Community Importance, EU). The mentioned limits of the old concept of succession, due to non-equilibrium thermodynamics (Cfr. 5.1), eliminate the efficiency of environmental compensation, today based on restoration actions. This method of compensation does not consider the concept of "transformation deficit" sensu fngegnoli, 2002), which measure the lack of dissipation (of energy and related information) of a landscape system In Fig. 14, this deficit concern the area between the lines of natural behaviour and the restored one, after the break of alteration Moreover, the fimction of BTC allows to underline the thresholds indicating the main self-organisation structure of the ecocoenotope, from bush to forest. 

The two major problems in materials behaviour in work of this type lie in the achievement of patency at the junction with natural tissue and the avoidance of unacceptable levels of thrombogenicity. In relation to the former problem, the extent to which the elastic properties of host tissue and graft are matched has previously been suggested as an important factor (i.e., this Series, Volume 1, p. 421, refs. 81 and 82). Further clinical results accumulated over a two-year period support this proposition, indicating patency success rates of over 80% in artery grafts with matched compliance and less than 45% with mismatched grafts. ... 

Thus it will be seen that design and the way in which an artefact is used will largely influence which steel may prove successful. Simple precautions such as the flushing out of pumps and pipework with fresh water after use can mean the diflerence between satisfactory behaviour and limited life. The test data in Table 3.23" illustrate the marked eflect of water velocity. Those applications where prolonged contact with static sea-water cannot be avoided have provided some of the impetus for the development of the more highly alloyed austenitic, ferritic and duplex steels which are finding increasing favour for arduous sea-water service. 

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