Ageing artificial

Castle Svihov Middle age Artificial stone Collagens... 

Chateau in Namest nad Middle age Artificial marble Collagens... 

The selective heating of the active areas of the monolith by the CHC-concept can also be demonstrated experimentally. An automotive catalyst was aged artificially in a way that the first 3 cm were completely deactivated. With this aged catalyst the cold-start experiment from Figure 7 was repeated. 

Recently, instruments for measuring low temperatures have appeared on the market. In these, the Pt wire is fused into a fine groove of a glass tube and coated with a thin glass film. Such instruments have very low thermal inertia. For the most accurate measurements the wire should be aged artificially by heating it... 

The relaxation process that takes place in plastics after fabrication. Upon cooling a melt, the molecular mobility decreases, and when the relaxation time exceeds the experimental time scale, the melt becomes a glass in nonequilibrium thermodynamic state (density, enthalpy, etc.). Thus, the value of the thermodynamic parameters continues to change toward an equilibrium state. The process may lead to development of cracks and crazes that initiate critical failure. See also Aging, Accelerated aging, Artificial aging, and Chemical aging. ... 

T3 Solution heat treated, cold worked, and aged naturally to a substantially stable condition T4 Solution heat treated and aged naturally to a substantially stable condition T5 Cooled from elevated-temperature shaping process, and then aged artificially... 

T6 Solution heat treated, then aged artificially... 

T9 Solution heat treated, aged artificially, then cold worked... 

Wild electricity—lightning and other natural phenomena that result from differences in the oxidation potentials of different materials—has been observed and known for ages. Artificially produced electricity may have been known thousands of years ago, although this has not been proven conclusively. For example, artifacts recovered from some ancient Parthian tombs near Bs hdad, Iraq, bear intriguing similarities in construction to those of more modern electrochemical cells or batteries. Reconstructions of the ancient device have produced electric current at about 0.87 volts, and other observations indicate that the devices may have been used to electroplate metal objects with gold or silver. 

Artificial ageing Artificial ageing is the exposure of a material to laboratory conditions in order to study the changes on ageing. The environmental conditions are usually increased, in time or intensity, over that experienced by the material in normal use. 

Following the quench, the alloy was aged naturally (i.e., held at room temperature) or aged artificially by heating at a relatively low temperature (93°C-204 C), but 165°C was employed in this work. 

Alloy Temper Solution heat treatment temperature (°C) Quenching medium Waiting time between artificial ageing and natural ageing Artificial ageing Natural ageing duration mini, (d)... 

They are driven while still soft, then allowed to age harden at the normal ambient temperature. This is termed natural aging artificial aging is carried out at elevated temperatures. 

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