Motion crank-shaft

A mixture of air and a fine spray of gasoline at ambient (outside air) temperature is fed to a set of piston-fitted cylinders in an automobile engine. Sparks ignite the combustible mixtures in one cylinder after another, and the consequent rapid increase in temperature in the cylinders causes the combustion products to expand and drive the pistons. The back-and-forth motion of the pistons is converted to rotary motion of a crank shaft, motion that in turn is transmitted through a system of shafts and gears to propel the car. 

The PPT structures, in contrast to the polyesters, seem thus to be best described as crystals with (minor) defert regions. Of interest would be the introduction of structural disorder that may permit more large-scale motion. It must be considered, however, that even in dilute solution, PPT shows no evidence of cis-isomeric amide groups i.e. the only types of motion seem, indeed, crank-shaft motion and... 

Dynamic-mechanical experiments (DMTA), e.g. [50,87-89]. This technique is not only sensitive to the glass transition but also to secondary relaxation phenomena and can detect crank shaft motions, chain distortion, etc. [89]. This is important because these types of relaxation processes seem to be sensible to the dispersion of the phases in each other and interface effects. Mechanical quantities can be measured. DMT A seems to be more sensitive in the detection of small amounts of additional components compared with DSC and TMA [91, 92] (see also section 9.12.1). 

A little-noticed theoretical paper interpreting the photochemistry of diazines recognized the concerted nature of the isomerization process.However, somewhat baffhngly, it described the motion as a three-bond concerted twist process in the form of a crank-shaft motion. These inexact descriptions appeared to have distracted from what is distinctly an HT-Hke process as shown in an accompanying figure in the paper. 

To measure this flow, the motion of the shaft generates a cone with the point, or apex, down. The top of the shaft operates a revolution counter, through a crank and set of gears, which is calibrated to indicate total system flow. A variety of accessories, such as automatic count resetting devices, can be added to the fundamental mechanism, which perform functions in addition to measuring the flow. 

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