Roll-forming terms

The term pass line is frequently used by the industry, but it is seldom clearly defined. According to one definition, pass line is measured from the top machined surface of the rollforming mill bed to the bottom of a usually horizontal section of the roll-formed product at the last pass, where the top and bottom rolls have the same circumferencial speed. Occasionally, the pass line measured from the floor is also given. The pass line can also be defined as the point between the last pass top and bottom rolls having the same circumferencial speed (Fig. 6). 

Parallel /3 structure usually forms large, moderately twisted sheets such as in Fig. 23, although occasionally it rolls up into a cylinder with helices around the outside (e.g., triosephosphate isomerase). Large antiparallel sheets, on the other hand, usually roll up either partially (as in the first domain of thermolysin or in ribonuclease) or completely around to join edges into a cylinder or barrel. Occurrence, topology, and classification of /3 barrels will be discussed in Section III,D, but here we will consider the interaction between the /3 sheets on opposite sides of the barrel, especially in terms of the angle at which opposite strands cross. 

We intend Reactive Intermediate Chemistry to serve as a free-standing resource to be used by the entire chemical community. It should be especially useful for first or second year graduate students, for whom it could form the basis of a course in reactive intermediate chemistry. To that end, each chapter features a concluding section devoted to a summary of the current situation, as well as a roll call of near-term problems and probable research directions. A list of key reviews and suggestions for additional reading accompanies each chapter. 

Wear by roll formation is where there is progressive tearing of a layer of rubber which forms a roll. The result is a characteristic abrasion pattern of ridges and grooves at right angles to the direction of movement. The term erosive wear can be applied to the action of particles conveyed in a liquid stream and there can also be corrosive wear due to direct chemical attack of the surface. 

Leatherwood (49) interprets his observations made with roll tube cultures of the anaerobic bacterium Ruminococcus albus to indicate that a single cellulase complex is formed from enzymes diffusing from two different colony types. He discussed the mechanism in terms of a non-... 

The removal of liquid oily soils from surfaces is generally understood in terms of three basic mechanisms the roll - back of droplets of oily soil, the surfaces of which are modified by the presence of an adsorbed layer of surfactant direct emulsification of macroscopic droplets of soil and the direct solubilization of the oily soil into surfactant micelles or other interfacial phases formed (1-3). 

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